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Switching conversion circuit

A switch conversion and circuit technology, which is applied to output power conversion devices, electrical components, DC power input conversion to DC power output, etc., can solve problems such as inability to apply logic inversion

Inactive Publication Date: 2015-03-18
MOSWAY SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this simple inversion of logic cannot be applied when such a device is cold started

Method used

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  • Switching conversion circuit
  • Switching conversion circuit
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Embodiment Construction

[0023] Now will refer to the attached drawings by example image 3 with Figure 5 To describe the preferred form of the present invention.

[0024] Reference image 3 with Figure 4 , Which shows that the optocoupler feedback control is added to the primary side regulation switching converter circuit as follows, where image 3 , The primary adjustment target Vo should be equal to or greater than the target Vo.

[0025] The conduction of the optocoupler LED can start the switching operation. In other words, it can be regarded as adding the primary side regulation control to the switching converter circuit with optocoupler feedback, so that the switching operation can be started when the LED of the optocoupler is turned on. In either case, the switching operation is a probable logic start.

[0026] in Figure 4 Among them, T1 is a transformer required for switching with PSW as a power switching device. Diodes D1, D2, D3, and D4 form a bridge rectifier circuit that converts AC input ...

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Abstract

The invention provides a switching conversion circuit. The switching conversion circuit comprises a transformer with a primary winding, a secondary winding and an auxiliary winding. An optical coupler device comprises an LED (light-emitting diode). The switching conversion circuit with a terminal receiving feedback from the optical coupler device is regulated on a primary side, so that when output voltage is lower than a target value or the LED is turned off, switching conversion is started. When output is lower than the target value, a detection circuit on a secondary side conducts the LED.

Description

Technical field [0001] The invention relates to a switch conversion circuit. The present invention more particularly relates to a low standby power optocoupler feedback control circuit. Background technique [0002] There is now a declining demand for the standby power of both the power supply and the charger device. NXP's application note AN11060 discloses a method to reduce the standby power used for primary-side regulation switching devices. US patent application US2012 / 01341484A1 discloses a method of adding a three-pin device to the secondary side. When additional energy converted from the primary side is needed, the device informs the primary side via the secondary winding and auxiliary winding of the transformer. Because the three-pin device itself can be used as a low-dissipation preload, which can greatly increase or even eliminate the value of the preload resistor, this improves the control accuracy and the dynamic load response of the secondary voltage and reduces th...

Claims

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Application Information

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IPC IPC(8): H02M1/092
CPCH02M1/092H02M3/33515H02M3/33553
Inventor 谢潮声陈安邦
Owner MOSWAY SEMICON
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