Telephone activated power controller

• US 4,647,721 A
• Filed: 03/19/1985
• Issued: 03/03/1987
• Est. Priority Date: 03/19/1985
• Status: Expired due to Term

• Current Assignee: S.L. Waber, Inc. (Eaton Corporation PLC.)
• Original Assignee: Dynatech Computer Power, Inc.
• Inventors: Bell, James C., Busam, Vincent A., Holcombe, Wayne T.
• Primary Examiner(s): Rubinson, Gene Z.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US06/713,779
• Time in Patent Office: 714 Days
• Field of Search: 179/2 A
• US Class Current: 379/102.04
• CPC Class Codes: G06F 1/3209 Monitoring remote activity, e.g. over telephone lines or network connections
• CPC Class Codes: H04L 12/12 Arrangements for remote connection or disconnection of substations or of equipment thereof
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

A telephone activated power controller comprised of an electrical power inlet and a number of power outlets for supplying power to the devices of a computer or other system. A detection circuit detects telephone rings and off-hook conditions and powers up the system. A remote control circuit allows the computer to keep the power on after hang-up or manual power-off. A status sensor circuit tells the computer if the device has been turned on manually or remotely. An inhibit circuit prevents the device from responding to a telephone ring or off-hook condition if it is engaged. The controller also has a surge protection circuit to prevent large voltages or current from reaching the power outlets.

Claims

1. A telephone activated power controller comprising:

a power input means for receiving electrical AC power;

a power output means connected to the power input means for supplying electrical AC power to output devices;

a telephone input means for receiving signals generated by outside telephonic systems;

a telephone output means for delivering telephonic signals to said output devices;

a power control means connected intermediate the power input means and the power output means for controlling the flow of power from the power input means to the power output means and for disrupting said power flow responsive to a power-on or power-off signal, the power control means including a NAND gate for receiving the power-on and power-off signals and for sending relay signals responsive to said power-on and power-off signals, a relay connected intermediate the power input means and the power output means for switching on and off power from the power input means to the power output means, a transistor connected to said relay for controlling said relay responsive to said relay signals, a resistor connected intermediate said NAND gate and said transistor for providing transistor isolation, a diode connected in parallel with said relay for shunting stored magnetic energy when said relay is turned off, a resistor connected intermediate the power supply means and said relay for protecting said relay from overheating, and a capacitor connected intermediate said relay and said NAND gate for delaying the reception of a power-on signal at said NAND gate to prevent instability;

a detection means connected to the telephone input means, telephone output means, and the power control means for detecting a ring signal from the telephone input means or an off-hook condition from the telephone output means and for delivering a power-on signal to the power control means responsive to said ring signal or said off-hook condition and for providing a connection between the telephone input means and the telephone output means and for delivering a power-off signal to the power control means responsive to an on-hook condition from the telephone output means; and

a power supply means connected to the power input means for providing a plurality of power levels.

6. The device of claim 1 wherein the power control means further comprises,

a delayed power output means connected to the surge protection means for supplying electrical AC power to other devices such as a computer,

a delay relay connected intermediate the power input means and said delayed power output means for switching on and off power from the power input means to the delay power output means;

a delay transistor connected to said delay relay for controlling said delay relay responsive to said relay signals;

an inverting gate connected intermediate said NAND gate and said delay transistor for receiving said relay signals and controlling said delay transistor responsive to said relay signals;

a RC network connected intermediate said NAND gate and said inverting gate for delaying the receipt of said relay power-on signal by said inverting gate for a period of time; and

a diode connected in parallel to said RC network for allowing immediate receipt of said relay power-off signal by said inverting gate.

7. The device of claim 1 wherein the power supply means comprises,

a transformer connected to the power input means for stepping down the voltage;

a full-wave bridge rectifier connected to said transformer for rectifying the output of said transformer;

a capacitor connected to the output of said full-wave bridge rectifier for providing a first DC source;

a regulator connected to the output of said full-wave bridge rectifier for providing a second DC source;

a capacitor connected to said transformer for charging on the negative swing of said transformer; and

a half-wave rectifier connected to said capacitor for providing a third DC source.

8. The device of claim 1 wherein the remote control means comprises,

a remote transistor connected intermediate the computer interface means and the power control means for receiving a computer stay-on signal and sending a responsive power-on signal;

a protective network comprised of a resistor connected intermediate the computer interface and said remote transistor, a resistor connected in parallel with said transistor, and a diode connected in parallel with said remote transistor, for providing remote transistor protection; and

a hysteresis network connected to the computer interface means for absorbing spurious signals from the computer interface means.

2. A telephone activated power controller comprising:

a power input means for receiving electrical AC power;

a power output means connected to the power input means for supplying electrical AC power to output devices;

a telephone input means for receiving signals generated by outside telephonic systems;

a telephone output means for delivering telephonic signals to said output devices;

a power control means connected intermediate the power input means and the power output means for controlling the flow of power from the power input means to the power output means and for disrupting said power flow responsive to a power-on or power-off signal;

a detection means connected to the telephone input means, telephone output means, and the power control means for detecting a ring signal from the telephone input means or an off-hook condition from the telephone output means and for delivering a power-on signal to the power control means responsive to said ring signal or said off-hook condition and for providing a connection between the telephone input means and the telephone output means and for delivering a power-off signal to the power control means responsive to an on-hook condition from the telephone output means; and

a power supply means connected to the power input means for providing a plurality of power levels;

a computer interface means for allowing signals to pass between a computer and the device;

a remote control means connected to the computer interface means and the power control means for sending a power-on or power-off signal to the power control means responsive to a computer signal;

a sense power output means connected to the power input means for supplying electrical AC power to other devices such as units of a computer system;

a power sensor means connected intermediate the power input means and the sense output means for detecting the flow of power from the power input means to the sense power output means and for delivering a turn-off signal to the power control means responsive to the termination of said flow of power, the power sensor means comprising an optical-insolator connected intermediate the power input means and the sense power output means for detecting the flow of power from the power input means to the sense power output means and for delivering a responsive power-on signal to the power control means, a limiting network comprised of a plurality of diodes connected parallel to said optical-insolator and a resistor connected intermediate said optical-isolator and said diodes, for limiting the current flow to said optical-isolator, a diode connected in parallel with said optical-insolator for limiting the voltage, a resistor connected parallel to said optical-isolator for setting a minimum current threshold for said optical-isolator, and a low pass filter connected intermediate said optical-isolator andd the power control means for limiting narrow transients.

3. The device of claim 2 further including,

a status sensor means connected to the power supply means, the computer interface means, and the power sensor means for sensing a power-on signal from the power sensor means and delivering a status signal to the computer interface means;

and

an inhibit means connected to the power supply means, the computer interface means, and the detection means for receiving an inhibit signal from the computer interface means and preventing the detection means from sending a power-on signal to the power control means.

4. The device of claim 3 further including,

a surge protection means connected intermediate the power input means and the power output means for limiting the amount of power flowing from the power input means.

5. The device of claim 4 further including,

an indicator means connected to the power supply means, the power sensor means, the detection means and the remote control means for providing the user with a visual indication of whether the device is on or off and whether the power output means were last turned on manually by the power sensor means or remotely by the detection means or remote control means.

9. The device of claim 3 wherein the status sensor means comprises,

a status inverting gate connected intermediate the power sensor means and the computer interface means for receiving a power-on signal from the power sensor means;

a parallel transistor connected intermediate said status inverting gate and the computer interface means for sending a status signal to the computer interface means;

a serial transistor connected intermediate said status inverting gate and the computer interface means for sending a status signal to the computer interface means;

a resistor connected intermediate said status inverting gate and said parallel transistor for providing voltage protection and isolation;

a resistor connected parallel with said parallel transistor to provide voltage division;

a resistor connected intermediate said parallel transistor and the power supply means to provide voltage pull-up;

a resistor connected intermediate said status inverting gate and said serial transistor to provide isolation;

a resistor connected intermediate said serial transistor and ground to provide voltage division;

a resistor connected intermediate said serial transistor and the computer interface means to provide voltage protection; and

a resistor connected intermediate said parallel transistor and the power supply means to provide voltage pull-down.

10. The device of claim 3 wherein the inhibit means comprises,

an inhibit transistor connected intermediate the computer interface means and said optical-isolator of the detection means for sending an inhibit signal to said optical-isolator responsive to a computer signal;

a resistor connected intermediate the power supply means and said inhibit transistor for keeping said inhibit transistor on in the absence of said computer signal;

a resistor connected intermediate the computer interface means and said inhibit transistor to provide voltage protection;

a resistor connected intermediate the computer interface means and the power supply means for providing voltage protection;

an inverting transistor connected intermediate the computer interface means and said inhibit transistor for inverting the computer signal sent to said inhibit transistor;

a jumper connected intermediate the computer interface means and said inhibit transistor and said reverse transistor for directing the computer signal to said inhibit transistor or to said inverting transistor;

a diode connected in parallel to said inverting transistor for shunting large voltages; and

a resistor and diode network connected intermediate the computer interface and said inverting transistor for providing voltage protection.

11. A telephone activated power controller comprising:

a power input means for receiving electrical AC power;

a power output means connected to the power input means for supplying electrical AC power to output devices;

a telephone input means for receiving signals generated by outside telephonic systems;

a telephone output means for delivering telephonic signals to said output devices;

a power control means connected intermediate the power input means and the power output means for controlling the flow of power from the power input means to the power output means and for disrupting said power flow responsive to a power-on or power-off signal;

a detection means connected to the telephone input means, telephone output means, and the power control means for detecting a ring signal from the telephone input means or an off-hook condition from the telephone output means and for delivering a power-on signal to the power control means responsive to said ring signal or said off-hook condition and for providing a connection between the telephone input means and the telephone output means and for delivering a power-off signal to the power control means responsive to an on-hook condition from the telephone output means, the detection means including an RC load network connected to the ring line of the telephone input means for providing a ring load, a full-wave bridge rectifier connected to said RC load network and the tip line of the telephone input means for rectifying the ring signal and providing a current path for an off-hook condition signal, an optical-isolator connected across said full-wave bridge for receiving ring and off-hook condition signals from said full-wave bridge and for sending responsive power-on and power-off signals to the power control means, a low pass filter connected intermediate said optical-isolator andd the power control means for eliminating spurious signals, a limiting network comprised of a plurality of diodes connected in parallel to said optical-isolator and a resistor connected intermediate said optical-isolator and said diodes for limiting the current flow to said optical-isolator, a lock-out delay RC network connected to the power control means for receiving and delaying a relay control signal when the power output means have been powered up, a lock-out transistor connected to said lock-out relay for controlling said lock-out relay, a lock-out inverting gate connected intermediate said telephone delay RC network and said lock-out transistor for receiving said power-up signal and controlling said lock-out transistor responsive to said power up signal, and a diode connected in parallel to said telephone delay RC network for allowing immediate receipt of a relay control signal by said lock-out inverting gate; and

a power supply means connected to the power input means for providing a plurality of power levels.

12. The device of claim 11 wherein the power supply means comprises,

a transformer connected to the power input means for stepping down the voltage;

a full-wave bridge rectifier connected to said transformer for rectifying the output of said transformer;

a capacitor connected to the output of said full-wave bridge rectifier for providing a first DC source;

a regulator connected to the output of said full-wave bridge rectifier for providing a second DC source;

a capacitor connected to said transformer for charging on the negative swing of said transformer; and

a half-wave rectifier connected to said capacitor for providing a third DC source.

13. The device of claim 12 further including,

a computer interface means for allowing signals to pass between a computer and the device;

and

a remote control means connected to the computer interface means and the power control means for sending a power-on or power-off signal to the power control means responsive to a computer signal, comprised of a remote transistor connected intermediate the computer interface means and the power control means for receiving a computer stay-on signal and sending a responsive power-on signal, a protective network comprised of a resistor connected intermediate the computer interface and said remote transistor, a resistor connected in parallel with said remote transistor, and a diode connected in parallel with said remote transistor, for providing remote protection, and a hysteresis network connected to the computer interface means for absorbing spurious signals from the computer interface means.

14. The device of claim 13 further including,

a sense power output means connected to the power input means for supplying electrical AC power to other devices such as units of a computer system;

and

a power sensor means connected intermediate the power input means and the sense output means for detecting the flow of power from the power input means to the sense power output means and for delivering a power-on signal to the power control means responsive to said flow of power and for delivering a power-off signal to the power control means response to the termination of said flow of power, comprised of an optical-isolator connected intermediate the power input means and the sense power output means for detecting the flow of power from the power input means to the sense power output means and for delivering a responsive power-on signal to the power control means, a limiting network comprised of a plurality of diodes connected parallel to said optical-isolator and a resistor connected intermediate said optical-isolator and said diodes, for limiting the current flow to said optical-isolator, a diode connected in parallel with said optical-isolator for limiting the voltage, a resistor connected parallel to said optical-isolator for setting a minimum current threshold for said optical-isolator, and a low-pass filter connected intermediate said optical-isolator and the power control means for limiting narrow transients.

15. The device of claim 14 further including,

a status sensor means connected to the power supply means, the computer interface means, and the power sensor means for sensing a power-on signal from the power sensor means and delivering a status signal to the computer interface means, comprised of a status inverter gate connected intermediate the power sensor means and the computer interface means for receiving a power-on signal from the power sensor means, a parallel transistor connected intermediate said status inverting gate and the computer interface means for sending a status signal to the computer interface means, a serial transistor connected intermediate said status inverting gate and the computer interface means for sending a status signal to the computer interface means, a resistor connected intermediate said status inverting gate and said parallel transistor for providing voltage protection and isolation, a resistor connected parallel with said parallel transistor to provide voltage division, a resistor connected intermediate said parallel transistor and the power supply means to provide voltage pull-up, a resistor connected intermediate said status inverting gate and said serial transistor to provide isolation, a resistor connected intermediate said serial transistor and ground to provide voltage division, a resistor connected intermediate said serial transistor and the computer interface means to provide voltage protection, and a resistor connected intermediate said parallel transistor and the power supply means to provide voltage pull-down.

16. The device of claim 15 further including,

an inhibit means connected to the power supply means, the computer interface means, and the detection means for receiving an inhibit signal from the computer interface means and preventing the detection means from sending a power-on signal to the power control means, comprising of an inhibit transistor connected intermediate the computer interface means and said optical-isolator of the detection means for sending an inhibit signal to said responsive to a computer signal, a resistor connected intermediate the power supply means and said inhibit transistor for keeping said inhibit transistor on in the absence of said computer signal, a resistor connected intermediate the computer interface means and said inhibit transistor to provide voltage protection, a resistor connected intermediate the computer interface means and the power supply means for providing voltage protection, an inverting transistor connected intermediate the computer interface means and said inhibit transistor for inverting the computer signal sent to said inhibit transistor, a jumper connected intermediate the computer interface means and said inhibit transistor and said inverting transistor for directing the computer signal to said inhibit transistor or to said inverting transistor, a diode connected in parallel to said inverting transistor for shunting large voltages, and a resistor and diode network connected intermediate the computer interface and said inverting transistor for providing voltage protection.

17. The device of claim 16 further including,

a surge protection means connected intermediate the power input means and the power output means for limiting the amount of power flowing from the power input means, comprised of a fuse connected to the power input means to provide current protection, a plurality of varistors connected parallel to the power input means for providing voltage protection, and a choke inductor connected intermediate two of said varistors for providing current surge protection.

18. The device of claim 17 further including,

an indicator means connected to the power supply means, the power sensor means, the detection means and the remote control means for providing the user with a visual indication of whether the device is on or off and whether it the power output means were last turned on manually by the power sensor means or remotely by the detection means or remote control means, comprised of a LED for providing a visual signal, a flip-flop with set line connected to the power sensor means and the reset line connected to the detection means and the remote control means such that said flip-flop will output a disabling signal when it receives a power-on signal from the power sensor means and will output a blinking signal when it receives a power-on signal from the detection means or remote control means, an oscillator connected intermediate said flip-flop and said LED for emitting a steady state signal or an oscillating signal responsive to a disabling signal or a blinking signal respectively, a plurality of inverting gates connected in parallel intermediate said oscillator and said LED for controlling said LED, a resistor connected intermediate said LED and the power supply means for providing voltage protection, and a resistor connected intermediate said flip-flop and ground for setting said flip-flop in a steady state when poiwer is initially powered up.

19. The device of claim 18 further including,

a resistor connected parallel to the serial ground and the parallel ground of the computer interface for providing sufficient ground return so that the serial port of a computer will function and also for providing sufficient resistance to prevent damage to the parallel port of a computer.

20. A telephone activated power controller comprising:

a power input means for receiving electrical AC power;

a power output means connected to the power input means for supplying electrical AC power to the output devices;

a telephone input means for receiving signals generated by outside telephonic systems;

a telephone output means for delivering telephonic signals to said output devices;

a power control means connected intermediate the power input means and the power output means for controlling the flow of power from the power input means to the power output means and for disrupting said power flow responsive to a power-on or power-off signal;

a detection means connected to the telephone input means, telephone output means, and the power control means for detecting a ring signal from the telephone input means or an off-hook condition from the telephone output means and for delivering a power-on signal to the power control means responsive to said ring signal or said off-hook condition and for providing a connection between the telephone input means and the telephone output means and for delivering a power-off signal to the power control means responsive to an on-hook condition from the telephone output means, and the detection means comprising a RC load network connected to the ring line of the telephone input means for providing a ring load, a full-wave bridge rectifier connected to said RC load network and the tip line of the telephone input means for rectifying the ring signal and providing a current path for an off-hook condition signal, an optical-isolator connected across said full-wave bridge and for sending responsive power-on and power-off signals to the power control means, a low pass filter connected intermediate said optical-isolator and the power control means for eliminating spurious signals, a limiting network comprised of a plurality of diodes connected in parallel to said optical-isolator and a resistor connect intermediate said optical-isolator and said diodes for limiting the current flow to said optical-isolator, a lock-out relay connected intermediate said full-wave bridge and the tip line of the telephone output means for controlling the flow of current of the tip line to the telephone output means, a telephone delay RC network connected to the power control means for receiving and delaying a relay control signal when the power output means have been powered up, a lock-out transistor connected to said lock-out relay for controlling said lock-out relay, a lock-out inverting gate connected intermediate said telephone delay RC network and said lock-out transistor for receiving said relay control signal and controlling said lock-out transistor responsive to said relay control signal, and a diode connected in parallel to said telephone delay RC network for allowing immediate receipt of a relay control signal by said lock-out inverting gate; and

a power supply means connected to the power input means for providing a plurality of power levels.

21. A telephone activated power controller comprising:

a power input means for receiving electrical AC power;

a power output means connected to the power input means for supplying electrical AC power to output devices;

a telephone input means for receiving signals generated by outside telephonic systems;

a telephone output means for delivering telephonic signals to said output devices;

a power control means connected intermediate the power input means and the power output means for controlling the flow of power from the power input means to the power output means and for disrupting said power flow responsive to a power-on or power-off signal;

a detection means connected to the telephone input means, telephone output means, and the power control means for detecting a ring signal from the telephone input means or an off-hook condition from the telephone output means and for delivering a power-on signal to the power control means responsive to said ring signal or said off-hook condition and for providing a connection between the telephone input means and the telephone output means and for delivering a power-off signal to the power control means responsive to an on-hook condition from the telephone output means;

a power supply means connected to the power input means for providing a plurality of power levels;

a computer interface means for allowing signals to pass between a computer and the controller;

a remote control means connected to the computer interface means and the power control means for sending a power-on or power-off signal to the power control means responsive to a computer signal;

a sense power output means connected to the power input means for supplying electrical AC power to other devices such as units of a computer system;

a power sensor means connected intermediate the power input means and the sense output means for detecting the flow of power from the power input means to the sense power output means and for delivering a power-on signal to the power control means responsive to said flow of power and for delivering a turn-off signal to the power control means responsive to the termination of said flow of power;

a status sensor means connected to the power supply means, the computer interface means, and the power sensor means for sensing a power-on signal from the power sensor means and delivering a status signal to the computuer interface means;

an inhibit means connected to the power supply means, the computer interface means, and the detection means for receiving an inhibit signal from the computer inerface means and preventing the detection means from sending a power-on signal to the power control means;

a surge protection means connected intermediate the power input means and the power output means for limiting the amount of power flowing from the power input means; and

an indicator means connected to the power supply means, the power sensor means, the detection means and the remote control means for providing the user with a visual indication of whether the device is on or off and whether the power output means were last turned on manually by the power sensor means or remotely by the detection means or remote control means, the indicator means including an LED for providing a visual signal, a flip-flop with set line connected to the power sensor means and the reset line connected to the detection means and the remote control means such that said flip-flop will output a dsiabling signal when it receives a power-on signal from the power sensor means and will output a blinking signal when it receives a power-on signal from the detection means or remote control means, an oscillator connected intermediate said flip-flop and said LED for emitting a steady state signal or an oscillating signal responsive to a disabling signal or a blinking signal respectively, a plurality of inverter gates connected in parallel intermediate said oscillator and said LED for controlling said LED, a resistor connected intermediate said LED and the power supply means for providing current limiting protection, and a resistor connected intermediate said flip-flop and ground for setting said flip-flop in a steady state when power is initially powered up.