Single-stage power supply with power factor correction and constant current output

Patent metadata

Field	Value
Publication number	US-9621057-B2
Application number	US-201614987445-A
Country	US
Kind code	B2
Filing date	Jan 4, 2016
Priority date	Jun 2, 2009
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

A switched mode power converter includes a switch, an energy transfer element coupled to the switch, and a controller that includes a delayed ramp generator coupled to generate a delayed ramp signal, an input charge control signal generator coupled to generate an input charge control signal representative of an integral of an input current sense signal and a ratio of an input voltage sense signal to an output voltage sense signal, and a drive signal generator coupled to receive the delayed ramp signal and the input charge control signal, to regulate an output of the switch mode power converter. The drive signal generator produces a drive signal responsive to the input charge control signal and the delayed ramp signal. The drive signal is coupled to control the switch of the switch mode power converter.

First claim

What is claimed is:

1. A switched mode power converter comprising:
a switch;
an energy transfer element coupled to the switch; and
a controller coupled to the switch to regulate an output of the switch mode power converter, wherein the controller includes:
a first input to be coupled to receive an input voltage sense signal representative of a dc input voltage of the switch mode power converter;
a second input to be coupled to receive an output voltage sense signal representative of a dc output voltage of the switch mode power converter;
a third input to be coupled to receive an input current sense signal representative of an input current of the switch mode power converter;
a delayed ramp generator coupled to generate a delayed ramp signal;
an input charge control signal generator coupled to generate an input charge control signal representative of an integral of the input current sense signal and a ratio of the input voltage sense signal to the output voltage sense signal; and
a drive signal generator coupled to receive the delayed ramp signal and the input charge control signal, and to regulate an output of the switch mode power converter, wherein the drive signal generator produces a drive signal responsive to the input charge control signal and the delayed ramp signal, and wherein the drive signal to be coupled to control the switch of the switch mode power converter.

2. The switch mode power converter of claim 1 , wherein the delayed ramp signal includes a plurality of piecewise linear segments.

3. The switch mode power converter of claim 2 , wherein the plurality of piecewise linear segments includes a first segment of substantially zero slope followed by a second segment have a finite linear slope.

4. The switch mode power converter of claim 1 , wherein the input charge control signal generator further comprises an integrator coupled to integrate the input current signal to generate an input charge signal.

5. The switch mode power converter of claim 1 , wherein the switch mode power converter is a flyback converter.

6. The switch mode power converter of claim 1 wherein the switch mode power converter is a buck converter.

7. A switch mode power converter comprising:
a power switch;
an energy transfer element including an input winding and an output winding, wherein the input winding is coupled to the power switch, wherein the output winding is coupled to an output of the switch mode power converter;
a controller coupled to the power switch to regulate the output of the switch mode power converter, wherein the controller includes:
a delayed ramp generator configured to generate a delayed ramp signal;
a mathematic operator coupled to generate a scaled current signal that is responsive to an input current sense signal and a ratio of an input voltage sense signal to an output voltage sense signal, wherein the input current sense signal is representative of an input current, wherein the input current has a pulsating waveform with a period that is a switching period of the switch mode power converter, and wherein the output voltage sense signal is a representative of a dc output voltage of the switch mode power converter;
an integrator coupled to integrate the scaled current signal to generate an input charge control signal; and
a drive signal generator coupled to receive the delayed ramp signal and input charge control signal, and to generate a drive signal in response thereto control the power switch to regulate the output of the switch mode power converter.

8. The switch mode power converter of claim 7 , wherein the delayed ramp signal includes a plurality of piecewise linear segments includes a first segment of substantially zero slope followed by a second segment having a finite linear slope.

9. The switch mode power converter of claim 8 , wherein the plurality of piecewise linear segments includes a first segment of substantially zero slope followed by a second segment having a finite linear slope.

10. The switch mode power converter of claim 7 , further comprising an oscillator coupled to generate a clock signal, wherein the delayed ramp signal is generated responsive to the clock signal.

11. A switched mode power converter comprising:
a switch;
an energy transfer element including an input winding, an output winding, and a third winding, wherein the input winding is coupled to the power switch, wherein the output winding is coupled to an output of the switch mode power converter, and wherein the third winding is coupled to provide an output voltage sense signal representative of a dc output voltage of the switched mode power converter;
a controller coupled to the switch to regulate the output of the switch mode power converter, wherein the controller includes:
a first input to be coupled to receive an input voltage sense signal representative of a dc input voltage of the switch mode power converter;
a second input to be coupled to receive the output voltage sense signal representative of the dc output voltage of the switch mode power converter;
a third input to be coupled to receive an input current sense signal representative of an input current of the switch mode power converter;
a delayed ramp generator coupled to generate a delayed ramp signal;
an input charge control signal generator coupled to generate an input charge control signal representative to an integral of the input current sense signal and a ratio of the input voltage sense signal to the output voltage sense signal; and
a drive signal generator coupled to the receive the delayed ramp signal and the input charge control signal, and to regulate the output of the switch mode power converter, wherein the drive signal generator produces a drive signal responsive to the input charge control signal and the delayed ramp signal, and wherein the drive signal is coupled to control the switch of the switch mode power converter.

12. The switch mode power converter of claim 11 , wherein the third winding is a bias winding that is further coupled to a resistor.

13. The switch mode power converter of claim 12 , wherein the output voltage sense signal is a feedback current.

14. The switch mode power converter of claim 11 , wherein the delayed ramp signal includes a plurality of piecewise linear segments.

15. The switch mode power converter of claim 14 , wherein the plurality of piecewise linear segments includes a first segment of substantially zero slope followed by a second segment have a finite linear slope.

16. The switch mode power converter of claim 11 , wherein the input charge control signal generator further comprises an integrator coupled to integrate the input current sense signal to generate an input charge signal.

17. The switch mode power converter of claim 11 , wherein the drive signal generator is a comparator.

18. The switch mode power converter of claim 11 , wherein the switch mode power converter is a flyback converter.

19. The switch mode power converter of claim 11 , wherein the switch mode power converter is a buck converter.

Assignees

• Power Integrations Inc

Inventors

• Saint-Pierre Roland Sylvere

Classifications

• H02M3/33523

  with galvanic isolation between input and output of both the power stage and the feedback loop · CPC title

• H02M2001/0009

  Electricity · mapped topic

• H05B33/0815

  Electricity · mapped topic

• H02M3/33515 Primary

  with digital control · CPC title

• Y02B70/126

  Cross-Sectional Technologies · mapped topic