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Self-oscillating dc-dc converter and method therefor

A DC converter and self-oscillating technology, which is applied in the direction of converting DC power input to DC power output, output power conversion devices, instruments, etc., can solve problems such as large losses, and achieve good efficiency, low loss, and high power density. Effect

Inactive Publication Date: 2009-09-02
OSRAM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Here, the recurring problem is: to generate this DC low voltage from the available mains AC voltage in an efficient and cost-effective manner
[0005] However, there are a number of problems here: firstly, the electronic switches used in the flyback converter must have a withstand voltage corresponding to at least twice the peak grid voltage
However, switching load-relief devices (snubbers (snubbers)) of expensive and especially lossy MOSFETs are usually used

Method used

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  • Self-oscillating dc-dc converter and method therefor
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  • Self-oscillating dc-dc converter and method therefor

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Embodiment Construction

[0029] figure 1 A circuit diagram of a first embodiment of a self-oscillating DC-DC converter according to the invention is shown schematically. Here, an input DC voltage U is present at the input E. This input DC voltage is preferably the so-called intermediate circuit voltage. As is known to those skilled in the art, this intermediate circuit voltage is usually derived from the grid voltage using a rectifier and a storage capacitor (represented here as storage capacitor C9 ). Optionally, filters and measures for PFC (Power Factor Correction) can be provided.

[0030] figure 1 The DC-DC converter according to the invention shown in , comprises a first bipolar transistor Q1 and a second bipolar transistor Q2 arranged in a half-bridge. Two capacitors C4, C5 are used as coupling capacitors. The DC-DC converter also includes a two-terminal AC switching element (Diac) D4, and the starting pulse is generated by a capacitor C7, so as to be able to start the self-oscillating DC...

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Abstract

The present invention relates to a self-oscillating DC-DC converter with two input connections, - a first (Q1) and a second bipolar transistor (Q2), wherein each bipolar transistor (Q1, Q2) has a control electrode, a reference electrode and a working electrode; at least one first coupling capacitor (C4, C5); wherein a first and a second switching section are formed by the working electrode - reference electrode section of the first or second bipolar transistor (Q1, Q2), wherein the two switching sections are connected in series; a rectifier (GL1), whose output is coupled to two output connections; and wherein the DC-DC converter furthermore comprises: a transformer (TRI) with a primary winding (PW), a secondary winding (SW) and at least one control winding (StW1; StW2), wherein the primary winding is coupled between a connection between the two switching sections and the coupling capacitor (C4; C5), the secondary winding is coupled to the input of the rectifier (GL1) and a control winding is associated with each bipolar transistor (Q1, Q2), said control winding being coupled to the control electrode of the respective bipolar transistor, and at least one timer (Z1, Z2), which is coupled between the corresponding control winding and the control electrode. The invention moreover relates to a method for operating the DC-DC converter.

Description

technical field [0001] The present invention relates to a self-oscillating DC-DC converter (DC-DC-Wandler) having first and second input terminals for applying an input DC voltage; first and second bipolar transistors, wherein each A bipolar transistor has a control electrode, a reference electrode and a working electrode; at least one coupling capacitor, wherein the first switching segment is formed by the working electrode-reference electrode segment of the first bipolar transistor, and the second switching segment is formed by the second bipolar transistor The working electrode-reference electrode segment of the polarity transistor is formed, wherein the first and second switching segments are connected in series with respect to the input DC voltage; a rectifier, the output of the rectifier is coupled to the first and second for providing the output DC voltage on the output. Furthermore, the invention relates to a method for providing a DC voltage on such a self-oscillatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/338
CPCH02M3/3382H02M3/338
Inventor 彼得·尼德迈尔贝恩德·鲁道夫
Owner OSRAM GMBH