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High-power-factor constant current control circuit

A constant current control circuit and high power factor technology, applied in the direction of converting AC power input to DC power output, high-efficiency power electronic conversion, output power conversion device, etc., can solve problems such as complex circuit structure, high cost, etc.

Active Publication Date: 2013-03-13
SHENZHEN SUNMOON MICROELECTRONICS
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to provide a high power factor constant current control circuit, aiming to solve the problem of complex circuit structure, high cost and inability to achieve high power factor and constant current output in a wide input voltage range in the prior art. question

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Embodiment Construction

[0017] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0018] In the embodiment of the present invention, by adopting a high power factor constant current control circuit including a switching tube, a zero-crossing comparison opening module, an error amplification module, an on-time control module, and a pulse signal generation module, the zero-crossing comparison opening module samples The voltage at the first end of the resistor R1 is zero-crossing compared and correspondingly outputs a comparison level signal to drive the pulse signal generation module to control the opening of the switch tube; the error amplification module performs error amplificat...

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Abstract

The invention belongs to the field of constant current control, and provides a high-power-factor constant current control circuit. A zero-crossing comparison opening module is used for performing zero-crossing comparison on the voltage of a first end of a sampling resistor R1 and then correspondingly outputting a comparison level signal to drive a pulse signal generating module to control the turn-on of a switching tube; an error amplifying module performs error amplification on the voltage of the first end of the sampling resistor R1 and then correspondingly outputs an error amplification voltage; and a conduction time control module outputs a conduction control level signal according to the error amplification voltage and a feedback level signal output by the pulse signal generating module to drive the pulse signal generating module to control the turn-off of the switching tube, so that while the circuit is simplified, the power factor and the voltage conversion efficiency are improved, and high-power-factor and constant current output is realized in a wide input voltage range.

Description

technical field [0001] The invention belongs to the field of constant current control, in particular to a high power factor constant current control circuit. Background technique [0002] At present, the concept of energy saving and environmental protection is advocated all over the world to reduce environmental pollution, and the same is true for the field of load equipment control. Many load devices require their control circuits to provide stable and reliable power supply to ensure their normal work in an orderly manner, especially for load devices that require constant current supply, their control circuits need to have constant current control functions. [0003] In addition, if the power factor of the load equipment connected to the AC grid is low, it will cause a certain degree of power pollution to the public grid. In order to reduce the degree of harm caused by power pollution, many countries have formulated corresponding power factor standards. For example, for L...

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Application Information

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IPC IPC(8): H02M7/219H02M1/42
CPCY02B70/126Y02B70/10
Inventor 李照华付凌云林道明赵春波谢靖
Owner SHENZHEN SUNMOON MICROELECTRONICS
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