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Rectifying circuit and power supply circuit

A technology of rectification circuit and external power supply, which is applied in the field of rectification circuit and power supply circuit, and can solve problems such as slow conduction of diodes

Inactive Publication Date: 2014-08-20
TOSHIBA LIGHTING & TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When such a rectifier circuit is used, for example, as a freewheeling diode of a switching power supply that operates at high speed, the conduction of the diode may be delayed due to the parasitic capacitance between the gate and source of the FET.

Method used

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  • Rectifying circuit and power supply circuit
  • Rectifying circuit and power supply circuit
  • Rectifying circuit and power supply circuit

Examples

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no. 1 approach ）

[0021] figure 1 It is a circuit diagram of a power supply circuit using the rectifier circuit 50 of the first embodiment.

[0022] figure 1 2 illustrates a step-down DC-DC converter (step-down converter) as an example of a power supply circuit.

[0023] The step-down converter alternately turns on and off the high-side switching elements Q1 and Q2 connected to the DC power supply 30 and the rectification circuit 50 , thereby outputting a voltage lower than the input voltage from the DC power supply 30 to the load.

[0024] The load is, for example, the light emitting element 20 . The light emitting element 20 is, for example, an LED (Light Emitting Diode). In addition, as the light-emitting element 20 , besides the LED, an organic light-emitting diode (Organic Light Emitting Diode: OLED), an inorganic electroluminescence (Inorganic ElectroLuminescence) light-emitting element, an organic electroluminescence (Organic ElectroLuminescence) light-emitting element, or other elect...

no. 2 approach ）

[0064] image 3 It is a circuit diagram of the power supply circuit of 2nd Embodiment.

[0065] In the second embodiment, a step-down converter is exemplified as a power supply circuit. In the step-down converter of the second embodiment, the external power supply 11 is connected to the source electrode of the switching element Q3 and the cathode of the diode D1 via the resistor 12 . other structures with figure 1 The step-down converters shown are the same and operate in the same way.

[0066] The resistor 12 functions as a limiting element that limits the current flowing from the auxiliary winding L2 to the external power supply 11 .

[0067] Figure 4 As shown in (b), a diode 13 can be used as such a limiting element. The diode 13 regards the direction from the external power supply 11 toward the source electrode of the switching element Q3 as the forward direction, and is connected between the external power supply 11 and the source electrode of the switching element ...

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Abstract

According to one embodiment, a rectifying circuit includes a diode, a switching element, a capacitor and an auxiliary winding. The diode is connected between a first terminal and a second terminal while a direction directed from the second terminal to the first terminal is a forward direction. The switching element includes a first main electrode connected to the first terminal, a second main electrode connected to a cathode of the diode, and a gate electrode connected to an anode of the diode. The auxiliary winding is magnetically coupled to an inductor. The auxiliary winding is connected to the gate electrode through the capacitor, and is connected to the second main electrode of the switching element and the cathode of the diode.

Description

technical field [0001] The invention relates to a rectifier circuit and a power supply circuit. Background technique [0002] Conventionally, a rectifier circuit in which a unipolar FET (Field Effect Transistor) as a normally-on element and a diode are connected gate-cathode has been proposed. The switching speed of this rectifier circuit depends on the diode, and the withstand voltage capability of the element depends on the FET. [0003] When such a rectifier circuit is used, for example, as a freewheeling diode of a switching power supply operating at high speed, the conduction of the diode may be delayed due to a parasitic capacitance between the gate and the source of the FET. [0004] 【Patent Literature】 [0005] [Patent Document 1] Japanese Patent Laid-Open No. 2008-198735 Contents of the invention [0006] According to the embodiment, a rectifier circuit capable of high-speed operation is provided. [0007] The present invention provides a rectifier circuit inc...

Claims

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Application Information

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IPC IPC(8): H02M7/06H02M3/28H02M1/08H05B44/00
CPCH05B33/08H03K17/082H03K19/0008H02M7/217H03K17/04123H05B45/00H05B44/00
Inventor 北村纪之
Owner TOSHIBA LIGHTING & TECH CORP
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