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AC-DC power switching circuit and repairing and adjusting method thereof

A power conversion circuit and circuit technology, applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., can solve the problems of large repairing workload, long repairing time, high repairing cost, etc.

Inactive Publication Date: 2011-02-16
VIMICRO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0033] Through the above trimming steps, the I out accuracy, but the disadvantage of this trimming method is that three variables need to be trimmed. Since there are many variables involved, there are a lot of trimming pads (pads) required in the circuit, and the workload of trimming is large. It takes a long time to adjust and adjust, resulting in very high adjustment costs

Method used

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  • AC-DC power switching circuit and repairing and adjusting method thereof
  • AC-DC power switching circuit and repairing and adjusting method thereof
  • AC-DC power switching circuit and repairing and adjusting method thereof

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Embodiment Construction

[0092] The present invention proposes an AC-DC power conversion circuit and its trimming method. When using the present invention to trim and adjust the relevant parameters of the output current of the AC-DC power conversion circuit in the constant current mode, only two variables need to be adjusted The purpose of ensuring the output current accuracy of the AC-DC power conversion circuit in the constant current mode can be achieved by performing trimming and trimming. The present invention will be further described through specific embodiments below in conjunction with the accompanying drawings.

[0093] The functional block diagram of the AC-DC power converter described in the embodiment of the present invention in the constant current mode is different from that in the prior art figure 1 Similarly, modules such as transformers, reference voltage generators, oscillator circuits, sensing circuits, current limit circuits, and pulse width generators are also included. in,

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Abstract

The invention provides an AC-DC power switching circuit and a repairing and adjusting method thereof. A current limiting circuit of the AC-DC power switching circuit is improved. In the current limiting circuit, a first reference current is generated by using a first resistor and a reference voltage generator, a reference current proportional to the first reference current in a preset second ratio is generated, a comparison current proportional to the induction current in a preset third ratio is generated, and an overcurrent protection signal is produced when the comparison current is greater than or equal to the reference current. Because the generation mode of the reference current is changed, the variables required to be repaired and adjusted in the subsequent repairing and adjusting processing can be reduced, and the repairing and adjusting workload is reduced.

Description

technical field [0001] The invention relates to the technical field of circuit design, and specifically designs an AC-DC power conversion circuit and a trimming method thereof. Background technique [0002] The AC-DC (AC-DC) power conversion circuit is used to convert AC power into DC power through a transformer. The AC-DC power conversion circuit has two operating modes: constant voltage mode and constant current mode. figure 1 It shows a schematic diagram of the functional modules of the AC-DC power converter in constant current mode, generally including: a transformer, a reference voltage generator, an oscillation circuit, a sensing circuit, a current limiting circuit and a pulse width generator. [0003] Wherein, the transformer includes a primary side circuit, a secondary side circuit and an auxiliary stage circuit ( figure 1 not shown in ), wherein, one end of the primary side coil in the primary side circuit is connected to the external AC power supply AC, and the ot...

Claims

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Application Information

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IPC IPC(8): H02M7/217
Inventor 陈敏董贤辉王钊
Owner VIMICRO CORP
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