Microcontroller for providing remote control of electrical switches

• US 5,434,973 A
• Filed: 03/17/1992
• Issued: 07/18/1995
• Est. Priority Date: 03/17/1992
• Status: Expired due to Fees

• Current Assignee: Lu, Chao-Cheng
• Original Assignee: Lu, Chao-Cheng
• Inventors: Lu, Chao-Cheng
• Primary Examiner(s): Lee, Thomas C.
• Assistant Examiner(s): Meky, Moustafa M.
• Application Number:
  US07/860,169
• Time in Patent Office: 1,218 Days
• Field of Search: 395/200, 395/275, 379/102, 379/105, 379/104, 364/221.9, 364/919.4, 364/919.5
• US Class Current: 700/24
• CPC Class Codes: H03K 17/136 in thyristor switches
• CPC Class Codes: H03K 17/79 controlling bipolar semiconductor switches with more than two PN-junctions, or more than three electrodes, or more than one electrode connected to the same conductivity region

Abstract

A microcontroller for providing remote control of electrical switches and comprising a control unit and a switch unit. The control unit comprises a telephone interface, a keyboard, a central processing unit and a character pattern interface. The switch unit comprises a data decoder, a central processing unit and a plurality of solid state relays, wherein the solid state relays are controlled to selectively connect power to loads or disconnect power therefrom, in response to commands sent from the keyboard directly, or through a telephone or radio telephone or a computer network from the keyboard.

Claims

1. A microcontroller for remotely controlling a plurality of electrical switches, said microcontroller comprising a control unit and a switch unit,

said control unit comprising:

a central processing unit for outputting a transmit code for recognition by said switch unit, a function code indicative of a desired status of said switch unit between an ON status and an OFF status and also indicative of any desired function of said switch unit including a time counting function, and a switch code designating a particular one of said plurality of electrical switches;

an address latch connected to said central processing unit;

a read only memory connected to said central processing unit by way of the address latch, for storing said transmit code, function code and switch code, as well as programs which determine operation of the control unit, said read only memory be interfaced by the address latch to the central processing unit;

a character pattern interface connected to said read only memory, for displaying the transmit code, the function code and the switch code;

a keyboard for receiving manually inputted data;

a keyboard decoder connected to keyboard and also connected to said central processing unit, for decoding said manually inputted data;

a first line driver/line receiver connected to said keyboard decoder and said central processing unit, said first line driver/line receiver being responsive to decoded data from said keyboard decoder, for providing said decoded data to said central processing unit;

a dual tone multifrequency unit for decoding data received from a telephone line;

a second line driver/line receiver connected to said dual tone multifrequency unit and to said central processing unit, for providing said central processing unit with decoded data from said dual tone multifrequency unit;

an electrically erasable programmable read only memory connected to said central processing unit, for storing registered data and preventing loss of said registered data during power failure; and

a transmitter interface connected to said central processing unit, for receiving said transmit code, said function code and said switch code from the central processing unit, converting said transmit code, said function code and said switch code into high frequency data, and transmitting said high frequency data to said switch unit;

said switch unit comprising;

a power supply;

a data decoder in communication with and responsive to said transmitter interface of the control unit, for decoding said high frequency data and converting said high frequency data into a low frequency signal containing said transmit code, said function code and said switch code;

a central processing device connected to said data decoder and responsive to said low frequency signal, said central processing device having a plurality of output ports and being programmed to compare said transmit code, said function code and said switch code respectively to default transmit codes, default function codes and default switch codes, said central processing device being further programmed to selectively provide output voltages to certain ones of said plurality of output ports pursuant to said comparison;

data storage means connected to said central processing device of the switch unit, for storing said default transmit codes, said default function codes and said default switch codes; and

a plurality of solid state relays connected to respective ones of said plurality of output ports and containing respective ones of said plurality of electrical switches, each of said plurality of solid state relays being responsive to said output voltages from the central processing device so as to close said respective ones of said plurality of electrical switches in response to the presence of said output voltages at said respective ones of said plurality of output ports;

a power indicator lamp which is illuminated whenever the switch unit is connected to electrical power;

an input indicator lamp connected to each of said plurality of solid state relays, for indicating by illumination the presence of said output voltages from the central processing device of the switch unit; and

an output indicator lamp connected to each of said plurality of solid state relays, each output indicator lamp being illuminated whenever a respective one of the plurality of switches is closed and provides power to a load.

2. The microcontroller of claim 1, wherein said manually inputted data from said keyboard includes said transmit code, said function code, said switch code and an execution code sequentially arranged according to said programs in the read only memory of the control unit.

3. The microcontroller of claim 1, wherein said switch unit is programmed to perform an "ON" operation, when said power indicator lamp is illuminated, said "ON" operation being performed in response to said transmit code, an "ON" function code, said switch code and an execution code transmitted by said control unit in response to said manually inputted data from said keyboard of said control unit.

4. The microcontroller of claim 3, wherein said switch unit is programmed to perform an "OFF" operation, when said power indictor lamp is illuminated, said "OFF" operation being performed in response to said transmit code, an "OFF" function code, said switch code and an executive code transmitted by said control unit in response to said manually inputted data from said keyboard of said control unit, said "OFF" operation comprising elimination of the output voltages from said central processing device of the switch unit and deactivation of said input indicator lamp;

and

wherein said transmit code, said function code and said switch code are transmitted through said keyboard of said control unit to said switch unit in a predetermined sequence controlled by said programs in the read only memory of the control unit;

said transmit code and said function code being incorporated into a special code and sent with said switch code to said switch unit via said control unit and said keyboard thereof.

5. The microcontroller of claim 4, wherein said transmit code, said function code and said switch code each begin with a start code and terminate with a stop code.

6. The microcontroller of claim 1, wherein said switch unit is programmed to perform an "OFF" operation, when said power indictor lamp is illuminated, said "OFF" operation being performed in response to said transmit code, an "OFF" function code, said switch code and an executive code transmitted by said control unit in response to said manually inputted data from said keyboard of said control unit, said "OFF" operation comprising elimination of the output voltages from said central processing device of the switch unit and deactivation of said input indicator lamp.

7. The microcontroller of claim 1, wherein said switch unit is programmed to execute a time setting operation, when said power indicator lamp is illuminated, said time setting operation being executed in response to said transmit code, a "time setting ON" function code, said switch code and an execution code transmitted by said control unit in response to said manually inputted data from said keyboard of said control unit.

8. The microcontroller of claim 7, wherein said switch unit is programmed to clear a time setting resulting from said time setting operation, when said power indicator lamp is illuminated, said time setting being cleared in response to said transmit code, a "time setting OFF" function code, said switch code and an execution code transmitted by said control unit in response to said manually inputted data from said keyboard of said control unit.

9. The microcontroller of claim 7, wherein said switch unit is programmed to execute a time setting operation, when said power indicator lamp is illuminated, said time setting operation being executed in response to said transmit code, a "time setting ON" function code, said switch code and an execution code transmitted by said control unit in response to said manually inputted data from said keyboard of said control unit;

and

wherein said "time setting ON" and "time setting OFF" function codes are repeatedly executable on a specific solid state relay of said switch unit.

10. The microcontroller of claim 1, wherein said control unit and said switch unit are interconnected by an AC power line carrying a sinusoidal AC signal, said control unit being programmed to transmit said high frequency data twice within a 360°

cycle of the sinusoidal AC signal, each transmission of said high frequency data occurring between a 90°

point and a 270°

point of said 360°

cycle.