DC/DC converter and pre-bias switching circuit thereof

A technology of DC converter and switch circuit, which is applied in the direction of converting DC power input into DC power output and output power conversion devices, instruments, etc., can solve the problems of freewheeling tube and load damage, etc. Improves stability and relieves stress

Active Publication Date: 2011-09-21
ASTEC POWER SUPPLY (SHENZHEN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the rated value is exceeded, it will damage the freewheel tube and load

Method used

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  • DC/DC converter and pre-bias switching circuit thereof
  • DC/DC converter and pre-bias switching circuit thereof
  • DC/DC converter and pre-bias switching circuit thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as Figure 6 As shown, a pre-bias switching circuit of a DC / DC converter includes a P-type switch tube, a switch tube drive signal supply module and a freewheel tube driver drive signal generation module. The first input terminal of the switching tube drive signal supply module is connected with the control signal Signal. The output terminal of the switching tube driving signal supply module is connected to the first input terminal of the P-type switching tube. The switch tube driving signal supply module and the P-type switch tube are respectively provided with power supply voltage by the active voltage VCC. The output terminal of the P-type switching tube is connected to the first input terminal of the freewheeling tube driver driving signal generation module, and the second input terminal of the freewheeling tube driver driving signal generating module is connected to the pulse width modulation controller (PWM control) of the DC / DC converter. Device) output fr...

Embodiment 2

[0039] Such as Figure 7 As shown, in this embodiment, the switching transistor drive signal supply module of the above-mentioned pre-biased switch circuit specifically includes a unidirectional conduction device, a first capacitor C1 and a first resistor R1. The drive signal generating module of the freewheel tube driver of the pre-biased switching machine circuit specifically includes a second diode D2, a second resistor R2 and a second capacitor C2.

[0040] Such as Figure 7 As shown, the first end of the unidirectional conduction device (corresponding to the first input end of the switch tube drive signal providing module) is connected to the switch machine control signal Signal, and the second end is connected to the first input end of the P-type switch tube. The pass device is turned on when the switch control signal is at high level. When the DC / DC converter is turned on, the switch control signal Signal maintains a high level; during the start-up process of the DC / D...

Embodiment 3

[0047] Such as Figure 9 As shown, the difference between this embodiment and Embodiment 2 is that in this embodiment, the unidirectional conduction device is the second P-type field effect transistor Q21, and the source of the second P-type field effect transistor Q21 is connected to the active voltage VCC connected, the drain of the second P-type field effect transistor Q21 is connected to the gate of the first P-type field effect transistor Q11, and the gate of the second P-type field effect transistor Q21 (that is, corresponding to the first input end of the switching tube drive signal providing module ) is connected with the switch machine control signal Signal.

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Abstract

The invention discloses a DC / DC converter and a pre-bias switching circuit thereof. The pre-bias switching circuit comprises a P-type switching tube, a switching tube driving signal providing module and a current-reflowing tube driver driving signal generating module, wherein the first input end of the switching tube driving signal providing module is connected with a switching control signal; the switching tube driving signal providing module is driven by the switching control signal to provide a driving signal for the P-type switching tube so that the P-type switching tube working in a linear region gradually enters a saturation region; the output end of the P-type switching tube is connected with the first input end of the current-reflowing tube driver driving signal generating module; the second input end of the current-reflowing tube driver driving signal generating module is also connected with a current-reflowing tube control signal output by a pulse width modulation (PWM) controller of the DC / DC converter; and the output end of the current-reflowing tube driver driving signal generating module outputs a triangular signal with a continuously increasing peak voltage to a current-reflowing tube driver of the DC / DC converter. The invention can monotonically start the circuit when a bias voltage exists during the boot-strap.

Description

technical field [0001] The invention relates to a pre-bias switch circuit of a direct current / direct current (DC / DC) converter, and also relates to a DC / DC converter using the pre-bias switch circuit. Background technique [0002] In recent decades, with the continuous development of high-frequency and high-efficiency power converters, the synchronous rectification technology using Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) as the switching device Gradually replacing the traditional diode rectification technology, it has been more and more widely used in power converters. [0003] However, since the MOSFET is a bidirectional switching device, it also brings some new problems when it is used as a freewheeling tube. Such as figure 1 As shown, take the step-down push-pull (BUCK+PUSH-PULL) converter as an example. When switching on and off, the freewheeling tube QF is turned on, and the output capacitor, inductance and freewheeling tube QF form a loop. Such a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155
Inventor 程杰斌张式春
Owner ASTEC POWER SUPPLY (SHENZHEN) CO LTD
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