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Multi-channel output DC-DC inverter

A DC converter and multi-output technology, applied in the direction of output power conversion device, conversion equipment with intermediate conversion to AC, DC power input conversion to DC power output, etc., to achieve enhanced EMC performance, easy implementation, and improved efficiency Effect

Active Publication Date: 2010-10-20
EMERSON NETWORK POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this topology circuit is difficult to achieve soft switching
Since there is no soft switch, the switching loss of the switching tube is large, and the rectifier tube needs to use a diode with a higher withstand voltage and a larger on-state voltage drop, and the rectification loss is large, so the efficiency of this topology circuit is low.
In addition, because there is no soft switching, the di / dt of the switch tube is poor, the reverse recovery current of the diode is large, and the electromagnetic compatibility (EMC) is poor
In addition, the dual-transistor forward multi-output converter uses output inductors, and the cost is relatively high

Method used

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  • Multi-channel output DC-DC inverter
  • Multi-channel output DC-DC inverter
  • Multi-channel output DC-DC inverter

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0036] The PWM control circuit 5 respectively outputs a square wave with a duty ratio of D, a switching frequency of fs and a square wave with a duty ratio of 1-D to the chopper 2 . The PWM control circuit 5 includes a drive circuit, a PWM modulation circuit, an isolation circuit, a PID (proportional, integral, differential control) regulator, and a reference voltage circuit.

[0037] The chopper 2 is composed of the first switching tube S1 and the second switching tube S2 in series, the chopper 2 is connected in parallel with the above-mentioned DC voltage source 1, and the PWM control circuit outputs a square wave with a duty ratio of D to the first switching tube The input of S1 outputs a square wave with a duty ratio of 1-D to the input of the second switching tube S2, and the chopper 2 can chop the DC power into an AC square wave and output it to the resonant circuit 3 .

[0038] The resonant circuit 3 is composed of a resonant capacitor Cr, a first resonant inductance Lr...

specific Embodiment approach 2

[0090] like Figure 8 As shown, the fourth embodiment differs from the first embodiment in that the auxiliary rectification circuit is a voltage doubler rectification circuit for the auxiliary circuit. The transformer T is composed of n+2 ((n>0, n is a natural number)) windings, and a voltage doubler filter Con' is added to each auxiliary circuit. The n+2 winding on the secondary side of the transformer T is connected to the nth output rectifier tubes Sna and Snb, and the nth output rectifier tubes Sna and Snb are rectified and then connected to the nth output filters Con and Con'. The output filter Cona and the series doubler filter Con' are connected in parallel to the output terminal Von.

specific Embodiment approach 3

[0091] like Figure 9 As shown, the difference between this specific embodiment and the first specific embodiment is that: the post-regulation scheme of the auxiliary circuit is adopted, so as to stabilize the output voltage of the auxiliary circuit. Each auxiliary road in this specific embodiment is added with a control switch Snc and an auxiliary road control circuit 9 (Control). The auxiliary circuit control circuit 9 inputs the output voltage of the auxiliary circuit, and the output terminal of the auxiliary circuit control circuit 9 is connected with the control terminal of the control switch. The nth rectifier tubes Sna and Snb are rectified and then connected to the control switch Snc, and the control switch Snc is then connected to the nth output filter Con. The switching tube Snc is controlled by the auxiliary circuit control circuit 9, and the auxiliary circuit control circuit 9 adjusts the output signal according to the nth output voltage to control the control swi...

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Abstract

This invention discloses a multi-channel output DC-DC converter including a transformer, a primary an a sub-commutation circuits, a PWM control circuit, in which, a secondary winding output of the transformer is connected with the inputs of the primary and the sub-commutation circuits, a chopper is composed of a first and a second switch tubes in series, the PWM control circuit outputs pulses with the duty ratio of D and 1-D to the control end of the two switch tubes to fix up the dead time of them, a resonance loop is composed of a resonance capacitor, a first and a second resonance inductors parallel to the first winding of the transformer, the input of the loop is connected with the chopper, the first inductor resonates with the capacitor to shut up the quasi-zero current of the two tubes and the second, the first inductor resonate with the capacitor to turn on the zero voltage of the two switch tubes.

Description

technical field [0001] The invention relates to a DC-DC converter, in particular to a multi-channel output DC-DC converter. Background technique [0002] In modern electronic equipment, multiple DC voltage sources of different levels are usually required for power supply. If a single output power supply is used for each level of DC voltage, although the power supply requirements of the load can be well met, the cost, volume and weight of the power supply will increase. Therefore, a multi-output DC-DC converter is generally used to provide multiple DC voltage sources of different levels. [0003] like figure 1 As shown, among the existing multi-output DC-DC converters, the dual-transistor forward multi-output DC-DC converter is widely used. But this topology circuit is difficult to realize soft switching. Since there is no soft switch, the switching loss of the switching tube is large, and the rectifier tube needs to use a diode with a higher withstand voltage and a lar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28H02M3/335H02M3/338
Inventor 雷兴华
Owner EMERSON NETWORK POWER CO LTD
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