Prebias switch machine circuit and prebias circuit and method of multi-cascade converter

A switch circuit, pre-bias technology, applied in the direction of adjusting electrical variables, converting DC power input to DC power output, instruments, etc., can solve the problems of easy damage to circuit devices, complex control of DC converters, and difficult control of switching points, etc. problem, to achieve the effect of preventing falling, realizing simplicity and precise control
CN106329905AInactive Publication Date: 2017-01-11ZTE CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZTE CORP
Publication Date
2017-01-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a prebias switch machine circuit and a prebias circuit and method of a multi-cascade converter, and is applied to the field of communication. The prebias switch machine circuit comprises a detection module and a control module, wherein the detection module is connected with an output end of the multi-cascade converter and is used for detecting an output signal of the multi-cascade converter, and the control module is connected with a push-pull circuit of the multi-cascade converter and is used for generating a prebias signal according to the detected output signal when the output signal is a preset output signal and controlling a rectification tube driving switch circuit of the push-pull circuit according to the prebias signal. Compared with the prior art, the prebias switch machine circuit has the advantages that the prebias switch machine circuit is additionally arranged in a DC converter, whether a prebias switch machine is needed or not is judged by detecting the output signal of the multi-cascade converter, the prebias switch machine circuit is simple to implement, and accurate control of an entry point is achieved. By the prebias switch machine circuit, the problem of device damage due to excessively large reverse current of a freewheeling switching tube caused by a prebias voltage of a load is solved, and the drop of an output voltage of the converter is also prevented.
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Description

technical field

[0001] The invention relates to the field of communications, in particular to a pre-bias switch circuit, a multi-cascade converter pre-bias circuit and a method. Background technique

[0002] see figure 1 , is a converter circuit composed of a BUCK circuit and a push-pull circuit two-stage topology circuit, an output filter circuit, a PWM control circuit and a fixed duty ratio output circuit.

[0003] The BUCK circuit includes a rectifier switch tube QR, a freewheeling switch tube QF, a first inductor Lout1, and an output first capacitor Co1; the primary side of the push-pull circuit includes two supervisors VT3 and VT4, and the secondary side includes two rectifier tubes VT5 and VT6; The output filter circuit includes the second output capacitor Co2, the second inductor Lout2 and the third capacitor filter circuit Co3; the PWM control circuit and the fixed duty ratio output circuit are respectively the PWM circuit controlling the driving of the BUCK circuit...

Claims

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