Integrated control circuit of setting brown-in voltage and compensating output power and method for operating the same

• US 8,937,819 B2
• Filed: 09/23/2011
• Issued: 01/20/2015
• Est. Priority Date: 04/13/2011
• Status: Active Grant

• Current Assignee: Power Forest Technology Corporation
• Original Assignee: NeoEnergy Microelectronics, Inc. (Delta Electronics Incorporated)
• Inventors: Wang, Kuan-Sheng
• Primary Examiner(s): Berhane, Adolf
• Assistant Examiner(s): Mehari, Yemane
• Application Number:
  US13/243,695
• Publication Number:
  US 20120262947A1
• Time in Patent Office: 1,215 Days
• Field of Search: 363/15, 363/21.01, 363/21.12, 363/21.15, 363/50, 363/56.11, 363/89, 363/124, 361/92, 361/93.9
• US Class Current: 363/21.12
• CPC Class Codes: H02M 1/0006 Arrangements for supplying an adequate voltage to the control circuit of converters
• CPC Class Codes: H02M 3/335 using semiconductor devices only

Abstract

An integrated control circuit of setting brown-in voltage and compensating output power and a method for operating the same are disclosed. The integrated control circuit is applied to a power supply. The integrated control circuit includes a control unit and a voltage regulation unit. The control unit has a control pin and a driven current outputs from or inputs into the control unit via the control pin. The voltage regulation is electrically connected to a DC input voltage terminal of the power supply and the control unit, thus receiving a DC input voltage and the driven current. By dividing the DC input voltage and the produced voltage by the driven current, a compound voltage is produced. Therefore, the fixed brown-in voltage is set and the output power is compensated when the power supply is operated under different input voltage levels.

Claims

1. An integrated control circuit of setting brown-in voltage and compensating output power, the integrated control circuit applied to a power supply and comprising:

a control unit having a control pin, and the control unit outputting or inputting a driven current via the control pin; and

a voltage regulation unit having a first resistor unit and a second resistor unit connected to the first resistor unit in series;

the voltage regulation unit electrically connected to the control unit and a DC input voltage terminal of the power supply, and receiving a DC input voltage and the driven current;

wherein resistance values of the first resistor unit and the second resistor unit are adjusted to divide the DC input voltage to produce a pin voltage, and the driven current is a sourcing current which outward flows from the control unit through the second resistor unit to produce a drop voltage, or the driven current is a sinking current which inward flows into the control unit through the second resistor unit to produce the drop voltage;

the pin voltage and the drop voltage are summed up to provide a compound voltage;

wherein the resistance value of the first resistor unit is substantially much greater than the resistance value of the second resistor unit so as to increase adaptation and diverseness of adjusting the compound voltage;

wherein, resistance values of the first resistor unit and the second resistor unit are adjusted, and the driven current is coordinated to provide different compound voltages to produce a plurality of compensation voltages at the same DC input voltage, thus providing the power compensation and fixing the brown-in voltage in accordance with different output powers of the power supply.

2. The integrated control circuit of claim 1, wherein the voltage regulation unit comprises:

the first resistor unit having a first terminal and a second terminal, and the first terminal electrically connected to the DC input voltage terminal of the power supply and the second terminal electrically connected to the control pin of the control unit;

the second resistor unit having a third terminal and a fourth terminal, and the third terminal electrically connected to the control pin of the control unit and the fourth terminal grounded.

3. The integrated control circuit of claim 2, wherein the pin voltage equals to the DC input voltage multiplied by a resistance value of the second resistor unit and then divided by the sum of a resistance value of the first resistor unit and a resistance value of the second resistor unit.

4. The integrated control circuit of claim 2, wherein the drop voltage is equal to the product of the driven current and a resistance value of the second resistor unit.

5. The integrated control circuit of claim 1, wherein the driven current is provided to control a slop of the compound voltage according to the DC input voltage and the compound voltage is fixed for a certain value of the DC input voltage.

6. The integrated control circuit of claim 1, wherein the driven current is produced through an inner voltage source and an inner resistor of the control unit.

7. The integrated control circuit of claim 1, wherein the control unit is an integrated circuit chip.

8. A method for operating an integrated control circuit of setting brown-in voltage and compensating output power, the method for operating the integrated control circuit applied to a power supply, the integrated control circuit having a control unit with a control pin, and having a voltage regulation unit with a first resistor unit and a second resistor unit connected to the first resistor unit in series, the method comprising the steps:

(a) outputting or inputting a driven current via the control pin from or to the control unit;

(b) receiving a DC input voltage and the driven current by the voltage regulation unit;

(c) adjusting resistance values of the first resistor unit and the second resistor unit to divide the DC input voltage to produce a pin voltage, and the driven current is a sourcing current which outward flows from the control unit through the second resistor unit to produce a drop voltage, or the driven current is a sinking current which inward flows into the control unit through the second resistor unit to produce the drop voltage;

the pin voltage and the drop voltage are summed up to provide a compound voltage;

wherein the resistance value of the first resistor unit is substantially much greater than the resistance value of the second resistor unit so as to increase adaptation and diverseness of adjusting the compound voltage; and

(d) adjusting resistance values of the first resistor unit and the second resistor unit, and the driven current is coordinated to provide different compound voltages to produce a plurality of compensation voltages at the same DC input voltage, thus providing the output power compensation and fixing the brown-in voltage in accordance with different output powers of the power supply.

9. The method for operating the integrated control circuit of claim 8, wherein the voltage regulation unit comprising:

the first resistor unit having a first terminal and a second terminal, and the first terminal electrically connected to the DC input voltage terminal of the power supply and the second terminal electrically connected to the control pin of the control unit;

the second resistor unit having a third terminal and a fourth terminal, and the third terminal electrically connected to the control pin of the control unit and the fourth terminal grounded.

10. The method for operating the integrated control circuit of claim 9, wherein the pin voltage equals to the DC input voltage multiplied by a resistance value of the second resistor unit and then divided by the sum of a resistance value of the first resistor unit and a resistance value of the second resistor unit.

11. The method for operating the integrated control circuit of claim 9, wherein the drop voltage is equal to the product of the driven current and a resistance value of the second resistor unit.

12. The method for operating the integrated control circuit of claim 8, wherein the driven current is produced through an inner voltage source and an inner resistor of the control unit.

13. The method for operating the integrated control circuit of claim 8, wherein the control unit is an integrated circuit chip.