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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

Inactive Publication Date: 2017-01-11
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main technical problem to be solved by the present invention is to provide a pre-bias switch circuit and a multi-cascade converter pre-bias circuit and method to solve the problem of complex control of the existing DC converter and easy damage to circuit devices and inaccurate switching points. The problem with easily controlled defects

Method used

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

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Embodiment 1

[0035] This embodiment provides a schematic structural diagram of a multi-cascade converter pre-bias circuit, as shown in figure 2 As shown, in this embodiment, a multi-cascade converter is taken as an example for illustration. The multi-cascade converter pre-bias circuit of the present invention includes a BUCK circuit 100, a push-pull circuit 200, an output filter circuit 300, a PWM control circuit and The fixed duty cycle output circuit 400 and the pre-bias switch machine circuit 500 . One end of the pre-bias switch circuit 500 is connected to the output end of the output filter circuit 300 , and the other end is connected to the push-pull circuit 200 . The BUCK circuit 100 adopts the synchronous rectification technology, and the push-pull circuit 200 also adopts the synchronous rectification technology for the secondary side rectification. Such as image 3 As shown, the BUCK circuit 100 includes a rectifier switch tube QR, a freewheeling switch tube QF, a first inductor...

Embodiment 2

[0041] This embodiment provides a pre-bias switch circuit, such as image 3 As shown, when the pre-bias detection circuit detects that the output SENSE voltage has reached the set value. The high level is output by the comparison circuit to enable the D2 driver chip. The characteristic of the D2 driver chip is that only when the EN signal is high, the input signals of INA and INB can be transmitted to OUTA and OUTB. When the pre-bias detection circuit detects that the output voltage has reached the set value, the driving signals of INA and INB are sent to OUTA and OUTB. Thus, the drive of the secondary side rectification MOS tube is turned on to achieve the purpose of preventing backfeeding. When D1A outputs a high level, through R11, the voltage of pin 3 of D1A is raised to eliminate the disturbance. When the output voltage drops to a certain set value, D1A outputs a low level, the D2 driver chip stops working, and the secondary side rectifier MOS tube driver is turned off...

Embodiment 3

[0043] This embodiment provides a pre-bias switch circuit, such as Figure 4 As shown, when the pre-bias detection circuit detects that the VOUT output voltage has reached the set value. The high level is output by the comparison circuit to enable the D2 driver chip. The characteristic of the D2 driver chip is that only when the EN signal is high, the input signals of INA and INB can be transmitted to OUTA and OUTB. When the pre-bias detection circuit detects that the output voltage has reached the set value, the driving signals of INA and INB are sent to OUTA and OUTB. Thus, the drive of the secondary side rectification MOS tube is turned on to achieve the purpose of preventing backfeeding. When D1A outputs a high level, through R11, the voltage of pin 3 of D1A is raised to eliminate the disturbance. When the output voltage drops to a certain set value, D1A outputs a low level, the D2 driver chip stops working, and the secondary side rectifier MOS tube driver is turned off...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02M1/32H02M3/337
CPCH02M1/32H02M1/36
Inventor 郭忠银吴乔
Owner ZTE CORP
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