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A constant current control circuit and method with power factor correction

A power factor correction, constant current control circuit technology, applied in output power conversion devices, control/regulation systems, electrical components, etc., can solve problems such as large size and sampling resistor power loss, and achieve compact circuit volume and output current. Stable, low application cost effect

Inactive Publication Date: 2016-01-06
SHANGHAI ZHANKONGBI ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Since this control method needs to sample the output current through the sampling resistor 715 and isolate it from the photocoupler, not only will there be power loss on the sampling resistor, but also the cost of the photocoupler will automatically increase the volume.

Method used

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  • A constant current control circuit and method with power factor correction
  • A constant current control circuit and method with power factor correction

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Embodiment Construction

[0026] The present invention is described in further detail now in conjunction with accompanying drawing.

[0027] like figure 1 It is a traditional constant current control circuit with power factor correction based on switching power supply Flyback topology. Because this control method needs to sample the output current through the sampling resistor 715 and isolate it from the photocoupler, not only the power loss on the sampling resistor, but also the cost problem caused by the photocoupler is required, and the volume will automatically be larger.

[0028] In order to eliminate the above problems, combined with figure 2 The specific implementation of the circuit is used to illustrate the specific implementation mode of the present invention.

[0029] like figure 2 As shown, a constant current control circuit with power factor correction, its circuit structure is as follows:

[0030] The two input ends of the rectifier 802 are connected to the two poles of the mains 80...

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PUM

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Abstract

A constant current control circuit with power factor correction, comprising: a power supply conversion circuit, a current sampling circuit and a control and constant current output circuit. The power supply conversion circuit is connected to the mains supply for supplying a voltage and a current for the circuits, and converts an alternating current signal into a direct current signal; and the current sampling circuit acquires the direct current signal, and converts same into a signal matching an output current, and then via the control and constant current output circuit, finally a constant current is output. Compared with the prior art, the invention has the advantages of small power loss, low application cost, small circuit volume, more stable output current and the like.

Description

technical field [0001] The invention relates to a constant current control circuit based on switching power supply Flybak or buck-bootst topology, in particular to a constant current control circuit and method with power factor correction. Background technique [0002] figure 1 It is a traditional output constant current circuit with power factor correction based on switching power supply Flybak topology. [0003] This constant current circuit includes rectifier bridge 802, AC sampling resistors 701 and 702, power factor correction chip (such as L6562) and peripheral circuit 710, switch tube 708, transformer 712, follower diode 713, filter capacitor 714, output current sampling resistor 715 and optocoupler 716. Wherein, the input AC voltage 801 is connected to the two input terminals of the rectifier bridge 802, the positive output terminal of the rectifier bridge 802 is connected to one end of the AC sampling resistor 701 and one end of the main winding Np of the transfor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/46
CPCH02M1/4258Y02B70/10Y02P80/10
Inventor 张义陶志波其他发明人请求不公开姓名
Owner SHANGHAI ZHANKONGBI ELECTRONICS TECH