Low dissipation controllable electron valve for controlling energy delivered to a load and method therefor

• US 5,598,093 A
• Filed: 07/26/1995
• Issued: 01/28/1997
• Est. Priority Date: 07/26/1995
• Status: Expired due to Fees

• Current Assignee: Bensys Incorporated
• Original Assignee: Bensys Incorporated
• Inventors: Acatrinei, Beniamin
• Primary Examiner(s): NGUYEN, MATTHEW VAN
• Application Number:
  US08/507,784
• Time in Patent Office: 552 Days
• Field of Search: 323/222, 323/282, 323/284, 323/299, 323/303
• US Class Current: 323/299
• CPC Class Codes: G05F 5/00 Systems for regulating electric variables by detecting deviations in the electric input to the system and thereby controlling a device within the system to obtain a regulated output

Abstract

A controllable electron valve for controlling an energy delivered to a load circuit in response to an input power source, comprising a power controller for controlling a voltage across said load circuit, an input current being introduced to said power controller via an input voltage (V_IN) electrode, said input current being generated by said input power source, said input current including a load current and an internal current (I_IN), said load current being output by said power controller to said load circuit, I_IN being output via a switching output, a current controller for maintaining I_IN at a constant value, said current controller having an output coupled to a ground, having an input, and having at least one current control electrode; a voltage threshold controller for outputting a threshold current, said voltage threshold controller having at least one input and at least one output; and a current separator for controlling the passage of I_IN and said threshold current to said constant current source, a first input of said current separator being coupled to said switching output of said power controller, a second input of said current separator being coupled to said output of said voltage threshold controller, an output of said current separator being coupled to said input of said current controller.

Claims

1. A controllable electron valve for controlling an energy delivered to a load circuit in response to an input power source, comprising:

a power controller for controlling a voltage across said load circuit, an input current being introduced to said power controller via an input voltage (V_IN) electrode, said input current being generated by said input power source, said input current including a load current and an internal current (I_IN), said load current being output by said power controller to said load circuit, the internal current (I_IN) being output via a switching output;

a current controller for maintaining the internal current (I_IN) at a constant value, said current controller having an output coupled to a ground, having an input, and having at least one current control electrode;

a voltage threshold controller for outputting a threshold current, said voltage threshold controller having at least one input and at least one output; and

a current separator for controlling the passage of the internal current (I_IN) and said threshold current to said constant current source, a first input of said current separator being coupled to said switching output of said power controller, a second input of said current separator being coupled to said output of said voltage threshold controller, an output of said current separator being coupled to said input of said current controller.

2. The controllable electron valve recited in claim 1 wherein the current separator comprises a first diode and a second diode, said first diode having a cathode and an anode, said second diode having a cathode and an anode, said cathode of said first diode being coupled to said cathode of said second diode and to the input of the constant current source, said anode of said first diode being coupled to the switching output of the power controller, said anode of said second diode being coupled to the output of the voltage threshold controller.

3. The controllable electron valve recited in claim 2 wherein the voltage threshold controller includes a potentiometer for adjusting a threshold output voltage of the threshold controller;

wherein the first diode and the second diode each have an ON and an OFF state, the first and second diodes conducting current when in said ON state and blocking current when in said OFF state; and

wherein when said threshold output voltage exceeds a threshold level of the second diode, the second diode is in said ON state and the threshold current flows through the second diode.

4. The controllable electron valve recited in claim 3 wherein a first voltage potential (V_T) exists at a Point T, said Point T being located at the switching output of the power controller;

wherein a second voltage potential (V_P) exists at a Point P, said Point P being located at the anode of the second diode;

wherein when the first voltage potential (V_T) is less than the second voltage potential (V_P), the first diode is in the OFF state and the second diode is in the ON state, whereby the internal current (I_IN) is blocked from flowing through the first diode and the threshold current is conducted through the second diode; and

wherein the threshold current flows to the ground through the common electrode of the constant current source.

5. The controllable electron valve recited in claim 4 wherein the second voltage potential (V_P) is a fixed voltage potential.

6. The controllable electron valve recited in claim 5 wherein when the first voltage potential (V_T) is greater than the second voltage potential (V_P), the first diode is in the ON state and the second diode is in the OFF state, whereby the internal current (l_IN) is conducted through the first diode and the threshold current is blocked from flowing through the second diode;

and wherein the internal current (I_IN) flows to the ground through the common electrode of the constant current source.

7. The controllable electron valve recited in claim 4 wherein the first and second diodes each have a threshold level;

wherein a commutation voltage potential (V_C) is defined as the voltage potential between the first voltage potential (V_T) and the second voltage potential (V_P);

wherein when the commutation voltage potential (V_C) is substantially the same as said threshold level of the first diode plus the threshold level of the second diode, the internal current (I_IN) and the threshold current are conducted through the first and second diodes, respectively, and both the internal current (I_IN) mad the threshold current flow to the ground through the common electrode of the constant current source.

8. The controllable electron valve recited in claim 7 wherein the sum of the internal current (I_IN) and the threshold current equals a total current, said total current being equal to a constant, K.

9. The controllable electron valve recited in claim 1 wherein the power controller comprises a transistor having an ON condition and an OFF condition.

10. The controllable electron valve recited in claim 9 wherein the transistor has a base, an emitter, and a collector, said emitter being coupled to the input voltage (V_IN) electrode and said base being coupled to the switching output, the internal current (I_IN) passing from said collector to said base.

11. The controllable electron valve recited in claim 9 wherein a first voltage potential (_VT) exists at a Point T, said Point T being located at the switching output of the lower controller;

wherein a second voltage potential (V_P) exists at a Point P, said Point P being located at the anode of the second diode;

wherein a commutation voltage potential (V_C) is defined as the voltage potential between the first voltage potential (V_T) and the second voltage potential (V_P);

wherein when the first voltage potential is greater than or equal to the second voltage potential plus the commutation voltage potential(V_T ≧

V_P +V_C), the transistor is in the ON condition;

wherein when the first voltage potential is greater than or equal to the second voltage potential(V_T ≧

V_P +V_C), the transistor is in the OFF condition.

12. The controllable electron valve recited in claim 9 wherein a first voltage potential (V_T) exists at a Point T, said Point T being located at the switching output of the power controller;

wherein a second voltage potential (V_P) exists at a Point P, said Point P being located at the anode of the second diode;

wherein a commutation voltage potential (V_C) is defined as the voltage potential between the first voltage potential (V_T) and the Second voltage potential (V_P);

wherein when the absolute value of the first voltage potential minus the second voltage potential is less than or equal to the commutation voltage potential (|V_T -V_P |≦

V_C), the power controller operates in a linear mode.

13. The controllable electron valve recited in claim 1, further comprising a rectifier coupled to the internal current (V_IN) electrode for generating a variable voltage.

14. The controllable electron valve recited in claim 1 wherein the constant current source comprises an FET transistor having a drain, a gate, and a source, said drain being coupled to the output of the current separator, said gate being coupled to the ground and to the output of the voltage threshold controller, and said being coupled to the ground and the current control electrode.

15. The controllable electron valve recited in claim 1 wherein the input power source has a maximum input voltage and the load circuit has a maximum load voltage;

and wherein the controllable electron valve controls, separately or simultaneously, said maximum input voltage, said maximum load voltage, the input current, and the load current.

16. An energy controller responsive to an input power source and coupled to a load, comprising:

a power controller for controlling an output voltage across said load, said power controller having an input, a load output, and an internal output, an input current being introduced to said power controller via said input, said input current being generated by said input power source, said input current including a load current and an internal current, said load current flowing out said load output and said internal current flowing out said internal output, said power controller having an input voltage generated by said input power source, said output voltage being a function of said input voltage, said power controller having a gain, said load current having a proportional relationship to the internal current relative to said gain;

a current separator, coupled to said internal input of said power controller, for controlling the flow of the internal current and a threshold current, said current separator having a current input and a switching current output;

a voltage threshold controller, coupled to said current input of said current separator, for outputting said internal current; and

a constant current source, coupled to said switching current output of said current separator, for maintaining the internal current at a constant value.

17. The energy controller recited in claim 16 wherein said voltage threshold controller has a threshold output, a potential voltage (V_P) being defined at a Point P located at said threshold output, the energy controller further comprising a DC source, coupled to an input of the voltage threshold controller, for controlling the potential voltage (V_P).

18. The energy controller recited in claim 16 wherein the input power source includes a wave generator and a rectifier coupled to said wave generator and to the input of the power controller.

19. The energy controller recited in claim 16 wherein the current separator includes a blocking circuit for blocking the flow of the internal current and the threshold current;

wherein the power controller has a saturation state and a saturation voltage;

wherein when the power controller is in said saturation state and said blocking circuit is blocking the flow of the threshold current, the output voltage is equal to the input voltage minus said saturation voltage.

20. A method for controlling energy delivered to a load, comprising:

generating a threshold voltage and a threshold current;

controlling an output voltage across said load, including;

generating an input current and an input voltage, said input current including a load current and an internal current, introducing said input current into a power controller, outputting said load current to said load, outputting said internal current from said power controller, wherein said output voltage is a function of said input voltage and is dependent on said threshold voltage, wherein said power controller has a gain and said load current has a proportional relationship to said internal current relative to said gain, and wherein said power controller has a saturation current, said saturation current being a constant value;

maintaining said internal current at a constant value, such that the sum of said internal current and said threshold current is equal to said saturation current; and

controlling the flow of said internal current and said threshold current, such that at least one of either said internal current or said threshold current flows to a ground.