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Synchronous rectification control circuit, control device and switching power supply of switching power supply

A technology of synchronous rectification and control circuit, which is applied in the direction of output power conversion device, control/regulation system, high-efficiency power electronic conversion, etc. It can solve the problems of complex structure of adjusting resistance circuit and limitation of circuit topology, and achieve convenient and flexible configuration, Easy to integrate design and prevent false triggering effects

Active Publication Date: 2020-04-07
SHANGHAI BEILING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the synchronous rectification control circuit and control device of the switching power supply in the prior art, the circuit structure is complicated due to the connection mode of the adjusting resistor, and the defect of the circuit topology is also limited, and a switching power supply is provided Synchronous rectification control circuit, control device and switching power supply

Method used

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  • Synchronous rectification control circuit, control device and switching power supply of switching power supply
  • Synchronous rectification control circuit, control device and switching power supply of switching power supply
  • Synchronous rectification control circuit, control device and switching power supply of switching power supply

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Embodiment 1

[0055] Such as Figure 2-3 As shown, the synchronous rectification control device of the switching power supply involved in this embodiment includes a transformer output winding LS, an output capacitor C2, an adjustment resistor Radj, a bypass capacitor C1, a synchronous rectification tube M0 and a synchronous rectification control circuit 1, wherein the adjustment resistor One end of Radj is connected to the time setting end AE of the synchronous rectification control circuit 1, one end of the bypass capacitor C1 is connected to the power supply end VCC of the synchronous rectification control circuit 1, and the gate of the synchronous rectification tube M0 is connected to the drive end of the synchronous rectification control circuit 1 DRV connection, the drain of the synchronous rectifier M0 is connected to the drain terminal D of the synchronous rectification control circuit 1, the source of the synchronous rectifier M0, the other end of the adjustment resistor Radj, the ot...

Embodiment 2

[0085] Such as Figure 4 As shown, the synchronous rectification control circuit and control device of the switching power supply involved in this embodiment are basically the same as those of Embodiment 1, the difference is that in the synchronous rectification control circuit 1, the resistance between the integral current Iint and the adjustment resistor Radj In this way, the voltage of adjusting resistor Radj can be detected by controlling the current flowing through adjusting resistor Radj, so that the integral current Iint is proportional to adjusting resistor Radj.

[0086] Specifically, the regulating current generating unit 1012 is used to generate the integral current Iint according to the reference current Iref, that is, in a specific implementation, the regulating current generating unit 1012 also includes a reference resistor Rref, and the non-inverting input terminal of the amplifier AMP is connected to one end of the regulating resistor Radj, The inverting input ...

Embodiment 3

[0088] Such as Figure 5 As shown, the synchronous rectification control device of the switching power supply involved in this embodiment is based on the synchronous rectification control circuit 1 in embodiment 1 or embodiment 2. In view of the synchronous rectification control circuit 1 and the adjustment resistor Radj and the synchronous rectification tube M0, etc. A 2-port structure (such as points A and B in the figure) is effectively formed to provide a synchronous rectification control device for a switching power supply. Specifically, one end of the transformer output winding LS is connected to one end of the output capacitor C2 as described The output positive terminal Vo+ of the switching power supply; the other end of the transformer output winding LS is connected to the drain of the synchronous rectifier M0, and the other end of the output capacitor C2 is connected to the reference ground GND of the synchronous rectification control circuit 1 as the output of the sw...

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PUM

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Abstract

The invention discloses a switching power supply, and a synchronous rectification control circuit and a control apparatus thereof, wherein the synchronous rectification control circuit comprises a regulating module, a discharge detection module, a charging detection module, an integral module and a logic module. according to the synchronous rectification control circuit, the adjustment resistor isretained to be connected to the reference ground, so that the synchronous rectification control circuit still has the characteristics of simple structure; accurate shielding time can be obtained by virtue of the adjusting module and integral module to ensure that no false triggering occurs; and the synchronous rectification control circuit, the regulating resistor and a synchronous rectifying tube equivalently constitute a two-port structure, and the topological structure of switching power supply is not limited, thereby facilitating flexible configuration of switching power supply circuit bya user conveniently.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a synchronous rectification control circuit, a control device and a switching power supply of a switching power supply. Background technique [0002] In switching power supply systems, power switches are usually used as synchronous rectifiers to replace freewheeling diodes, and synchronous rectification is used to improve conversion efficiency. In order to make the synchronous rectification control circuit control the on and off of the power switch simply and efficiently, an external adjustment resistor is often needed to set the masking time to prevent false triggering, and the power switch is prohibited from being turned off during the masking time. [0003] In the existing synchronous rectification control circuit, one method is to connect the adjusting resistor to the ground terminal of the synchronous rectification control circuit. The circuit structure is simple, but...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M3/33592Y02B70/10
Inventor 李淼
Owner SHANGHAI BEILING
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