Current mode synchronous rectification PWM control circuit

A control circuit and synchronous rectification technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc. The effect of simple circuit structure and high output voltage accuracy

Inactive Publication Date: 2016-06-15
WUHU RUIXIN ELECTRONICS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the current mode synchronous rectification PWM control circuit has the problems of complex circuit and slow response of the control circuit.

Method used

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  • Current mode synchronous rectification PWM control circuit
  • Current mode synchronous rectification PWM control circuit

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Embodiment

[0015] A current mode synchronous rectification PWM control circuit, the current mode synchronous rectification PWM control circuit includes an error amplification module, a PWM comparison module, a current sampling amplification module, an oscillator module and a drive module, the error amplification module and the oscillator module and The PWM comparison module is connected, the error amplification module generates the output voltage of the error amplifier through the feedback resistor, and the output voltage and the sawtooth wave signal generated by the oscillator module are superimposed as the input signal of the PWM comparison module, and the current sampling amplification module Connected with the PWM comparison module, the current sampling amplification module generates the output signal of the current loop by detecting the output current, and inputs it to the other end of the PWM comparison module, and the drive module is also connected with the PWM comparison module. C...

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Abstract

The invention discloses a current mode synchronous rectification PWM control circuit. A PWM comparison module and a current sampling amplification module are merged into a PWM current comparer, so that the circuit structure can be simpler, the circuit scale is smaller, and the circuit is easily integrated; the PWM current comparer is internally provided with an inverted tube, so that the problem that the reaction speed of the control circuit is slow caused by comparer delay can be solved; a slope superposition module is arranged between an error amplification module and an oscillator module, so that the problem of subharmonic oscillation in a current mode can be solved; when the output voltage variable quantity is 100 mV, the stability time is 90-100 us, the output voltage ripple of the control circuit is +/-4 mV, and the output voltage accuracy is +/-1%, so that the control circuit is high in output voltage accuracy and quick in transient response, and has extremely high application value.

Description

technical field [0001] The invention relates to the field of LED circuits, in particular to a current mode synchronous rectification PWM control circuit. Background technique [0002] In the BUCK type synchronous rectification DC-DC converter, compared with the voltage mode, the peak current mode has the advantages of fast network voltage regulation response, strong anti-interference ability, good load stability and easy implementation of over-current protection. The performance of the PWM control circuit directly affects the performance of the switching power supply. At present, the current mode synchronous rectification PWM control circuit has the problems of complex circuit and slow response of the control circuit. Contents of the invention [0003] The object of the present invention is to provide a current mode synchronous rectification PWM control circuit. [0004] In order to achieve the above object, the present invention provides the following technical solution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219
CPCH02M7/219H02M7/2195
Inventor 崔俊国朱成华
Owner WUHU RUIXIN ELECTRONICS TECH CO LTD
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