Systems and Methods for Voltage Regulation of Primary Side Regulated Power Conversion Systems with Compensation Mechanisms

Patent metadata

Field	Value
Publication number	US-2016190935-A1
Application number	US-201514604819-A
Country	US
Kind code	A1
Filing date	Jan 26, 2015
Priority date	Dec 24, 2014
Publication date	Jun 30, 2016
Grant date	—

Abstract

Systems and methods are provided for voltage regulation of power conversion systems. An example system controller includes: a first sampling component configured to sample a sensing signal and determine a compensation signal based on at least in part on the sensing signal, the sensing signal being associated with a first current flowing through a primary winding of a power conversion system; a signal processing component configured to receive a feedback signal and the compensation signal and generate a first signal based at least in part on the feedback signal and the compensation signal, the feedback signal being associated with an auxiliary winding coupled with a secondary winding of the power conversion system; an error amplifier configured to receive the first signal and a reference signal and generate an amplified signal based at least in part on the first signal and the reference signal.

First claim

1 . A system controller for a power conversion system, the system controller comprising:
a first sampling component configured to sample a sensing signal and determine a compensation signal based on at least in part on the sensing signal, the sensing signal being associated with a first current flowing through a primary winding of a power conversion system; a signal processing component configured to receive a feedback signal and the compensation signal and generate a first signal based at least in part on the feedback signal and the compensation signal, the feedback signal being associated with an auxiliary winding coupled with a secondary winding of the power conversion system; an error amplifier configured to receive the first signal and a reference signal and generate an amplified signal based at least in part on the first signal and the reference signal; a modulation component configured to receive the amplified signal and generate a modulation signal based at least in part on the amplified signal; and a driver component configured to receive the modulation signal and output a drive signal based at least in part on the modulation signal to close or open a first switch to affect the first current; wherein the system controller is configured to change the drive signal based on at least information associated with the compensation signal in order to adjust a winding voltage of the secondary winding and to at least partially compensate for a change in a forward voltage of a rectifying diode associated with the secondary winding.

2 . The system controller of claim 1 wherein:
the first sampling component is connected to a resistor network and configured to output the compensation signal.

3 . The system controller of claim 2 , wherein:
the resistor network includes a first resistor and a second resistor; a first resistor terminal of the first resistor is connected to a second resistor terminal of the second resistor; a third resistor terminal of the first resistor is connected to the auxiliary winding; and the second resistor terminal is further configured to receive the compensation signal.

4 . The system controller of claim 1 wherein the signal processing component includes:
a sample-and-hold component configured to sample and hold the feedback signal and the compensation signal and output a sampled-and-held signal based at least in part on the feedback signal and the compensation signal; and
a signal generator configured to receive the sampled-and-held signal and output the first signal based at least in part on the sampled-and-held signal.

5 . The system controller of claim 4 wherein the sample-and-hold component includes:
a second sampling component configured to generate a sampling signal;
a second switch configured to close or open in response to the sampling signal; and
a capacitor configured to receive the feedback signal and the compensation signal in response to the second switching being closed and provide the sampled-and-held signal.

6 . The system controller of claim 4 , further comprising:
a first resistor including a first resistor terminal and a second resistor terminal; wherein:
the first resistor terminal is connected to an inverting input terminal of the error amplifier; and
the second resistor terminal is connected to an output terminal of the error amplifier.

7 . The system controller of claim 1 wherein the modulation component includes:
a frequency control component configured to receive the amplified signal and generate a frequency control signal based at least in part on the amplified signal; and
a flip-flop component configured to receive the frequency control signal and generate the modulation signal based at least in part on the frequency control signal.

8 . The system controller of claim 7 wherein the modulation component further includes:
a first comparator configured to receive the sensing signal and a threshold signal and generate a first comparison signal based at least in part on the sensing signal and the threshold signal;
a compensation network configured to receive the amplified signal and generate a second signal based at least in part on the amplified signal;
a second comparator configured to receive the sensing signal and the second signal and generate a second comparison signal based at least in part on the sensing signal and the second signal; and
an OR gate configured to receive the first comparison signal and the second comparison signal and output a third signal based at least in part on the first comparison signal and the second comparison signal to the flip-flop component.

9 . The system controller of claim 8 wherein the compensation network includes:
a first resistor including a first resistor terminal and a second resistor terminal;
a second resistor including a third resistor terminal and a fourth resistor terminal; and
a capacitor including a first capacitor terminal and a second capacitor terminal;
wherein:
the first resistor terminal is configured to receive the amplified signal; and
the second resistor terminal is connected to the third resistor terminal and the first capacitor terminal configured to provide the second signal.

10 . The system controller of claim 1 wherein the first sampling component includes:
a sample-and-hold component configured to sample and hold the sensing signal and provide the sampled-and-held sensing signal;
an amplifier configured to receive the sampled-and-held sensing signal and generate an output signal based at least in part on the sampled-and-held sensing signal;
a current generator configured to generate a second current based at least in part on the output signal; and
a current mirror circuit configured to generate the compensation signal based at least in part on the second current.

11 . The system controller of claim 10 wherein the sample-and-hold component includes:
a second sampling component configured to generate a sampling signal;
a second switch configured to close or open in response to the sampling signal; and
a capacitor configured to receive the sensing signal in response to the second switching being closed and provide the sampled-and-held sensing signal.

12 . The system controller of claim 10 wherein the current generator includes:
a transistor including a first transistor terminal, a second transistor terminal and a third transistor terminal; and
a resistor including a first resistor terminal and a second resistor terminal;
wherein:
the amplifier includes an inverting input terminal and a non-inverting input terminal;
the first transistor terminal is configured to receive the output signal;
the second transistor terminal is connected to the first resistor terminal and the inverting input terminal; and
the third transistor terminal is connected to the current mirror circuit.

13 . The system controller of claim 10 wherein the current mirror circuit includes:
a first transistor including a first transistor terminal, a second transistor terminal and a third transistor terminal; and
a second transistor including a fourth transistor terminal, a fifth transistor terminal and a sixth transistor terminal;
wherein:
the first transistor terminal is connected to the fourth transistor terminal;
the second transistor terminal is connected to the fifth transistor terminal;
the third transistor terminal is connected to the current generator and the second transistor terminal; and
the sixth transistor terminal is configured to provide the compensation signal.

14 . The system controller of claim 1 is further configured to change the drive sig

Assignees

• On Bright Electronics Shanghai Co Ltd

Inventors

• Lin Yuan
• Sun Zhiqiang
• Wang Weihua
• Fang Lieyi

Classifications

• H02M3/33507 Primary

  with automatic control of the output voltage or current, e.g. flyback converters (H02M3/33561, H02M3/33569 take precedence) · CPC title

• H02M3/335

  using semiconductor devices only · CPC title

• H02M3/325

  using devices of a triode or a transistor type requiring continuous application of a control signal · CPC title