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Dc-dc converter circuit

A technology of DC-DC and conversion circuits, which is applied in the field of DC-DC conversion circuits, can solve problems such as the application of surge voltages to rectifier components, and achieve the effect of improving efficiency

Active Publication Date: 2010-09-22
SANSHA ELECTRIC MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the secondary diode has a energizable time trr (this time is called reverse recovery time or recovery time) caused by the accumulated charge (accumulated carrier) when it is turned off, so the transformer’s There is a through current flow in the secondary coil, and due to this, there is a problem that a surge voltage is applied to the rectifying element that is disconnected

Method used

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Examples

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Embodiment Construction

[0019] figure 1 It is a circuit diagram of a DC-DC conversion circuit according to an embodiment of the present invention.

[0020] A series circuit of a first capacitor C1 and a second capacitor C2 serving as a voltage source is connected in parallel to the DC power supply V1, and primary-side switching elements, that is, a first switching element S1 and a second switching element S1, are respectively connected in parallel to the capacitors C1 and C2. Element S2. Each of the switching elements S1 and S2 is composed of a semiconductor switching element, for example, an IGBT (Insulated Gate Bipolar Transistor) or a MOS-FET. The primary coil np of the transformer T is connected between the connection point of the capacitors C1 and C2 and the connection point of the switching elements S1 and S2 . Freewheeling diodes (clamp diodes) df1 and df2 are connected in antiparallel to the switching elements S1 and S2, respectively. In addition, there is provided a control unit CT that o...

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Abstract

A DC-DC converter circuit comprises a switching circuit for switching a DC power supply with a primary switch element, a transformer having primary winding to which the output from the switching circuit is applied and secondary winding for outputting a voltage transformed at a predetermined transformation ratio, and a secondary diode for rectification connected with the secondary winding of the transformer. The circuit further comprises a regenerative snubber circuit, which is connected between the rectification outputs of the secondary diode and includes a series circuit of a discharge prevention diode and a snubber capacitor and a switch element for regeneration connected in parallel with the discharge prevention diode, and a control section for turning on the switch element for regeneration for a predetermined time from the off timing of the primary switching element. The predetermined time is set to a time for substantially discharging the snubber capacitor due to a reverse recovery time when the secondary diode is turned off.

Description

technical field [0001] The present invention relates to a DC-DC converter circuit (converter circuit) provided with a snubber circuit on the secondary side. Background technique [0002] The DC-DC conversion circuit includes: a switching circuit for switching the DC power supply using a primary side switching element; a transformer, the output of the above switching circuit is applied to the primary side coil, and a voltage transformed according to a predetermined transformation ratio is output to the secondary side coil; And a secondary diode for rectification connected to the secondary side coil of the above-mentioned transformer. The output rectified by the secondary diodes is smoothed and supplied to the load. [0003] However, the secondary diode has a energizable time trr (this time is called reverse recovery time or recovery time) caused by the accumulated charge (accumulated carrier) when it is turned off, so the transformer’s There is a through current flowing in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/28
CPCH02M2001/342H02M3/33569H02M1/34Y02B70/1491Y02B70/10H02M1/342H02M3/33571
Inventor 藤吉敏一胜岛肇森本健次山村聪史
Owner SANSHA ELECTRIC MFG
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