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Switching type power supplier and its control circuit and method

A technology of power supply and control circuit, applied in control/regulation systems, instruments, electrical components, etc., can solve problems such as troubles

Inactive Publication Date: 2008-04-02
RICHTEK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Due to the voltage at node Lx V Lx High-frequency oscillating waveform will generate unwanted EMI noise, causing trouble

Method used

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  • Switching type power supplier and its control circuit and method
  • Switching type power supplier and its control circuit and method
  • Switching type power supplier and its control circuit and method

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Embodiment Construction

[0062] The main concept of the present invention is not to make the transistors Q1 and Q2 off at the same time; when the current I on the inductor L L When it is about to turn from positive to negative, the transistor Q2 is not completely turned off, but its state is changed so that its role is changed from a transistor switch to a current source, allowing low-flow current to pass through. Like this, compared with the prior art practice shown in Fig. 2, the present invention still has the high efficiency advantage of saving energy consumption, but compared with the prior art practice shown in Fig. 5 and Fig. 7, then the present invention will be able to greatly Reduce EMI noise.

[0063] Please refer to FIG. 9 , which shows an embodiment of the present invention in a schematic circuit diagram. This embodiment takes a step-down switching power supply as an example. As shown in the figure, in the step-down switching power supply 11 of the present invention, in addition to the u...

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PUM

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Abstract

The present invention presents a switching type power supplier and the control circuit and method thereof, the power supplier comprises the following components: a first transistor and a second transistor which are electrically connected with each other; an impulse width modulating integrated control circuit which is used to control the opening and closing of the first transistor and the opening of the second transistor; and a current source control circuit which is used to control to cause the second transistor become a current source. The two transistors of the invention will not go into inactive state at the same time. The impulse width modulating integrated control circuit and the current source control circuit of the invention can be directly electrically connected with the grid node of the second transistor, or be electrically connected with the grid node of the second transistor through a multiplex circuit. Comparing with the synchronous switched power supplier, the invention has the advantage of saving energy consumption and can greatly reduce the EMI noise.

Description

technical field [0001] The present invention relates to a switching regulator (switching regulator) and its control circuit and method, in particular to a switching regulator that has high efficiency and can reduce Electro-Magnetic Interference (EMI, Electro-Magnetic Interference), and Its control circuit and method. Background technique [0002] Commonly used switching power supplies include Buck, Booster and Inverter. Firstly, the step-down switching power supply will be described. Its circuit structure is roughly shown in Figure 1. The step-down switching power supply 1 includes two transistor switches Q1 and Q2, which are controlled by pulse width modulation. 10 to control the on and off of the two transistors Q1 and Q2, so as to control the amount and direction of the current on the inductor L, so as to transmit the electric energy to the output terminal OUT. The pulse width modulation control circuit 10 receives the feedback voltage extracted from the output terminal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156H02M3/158
Inventor 龚能辉朱冠任
Owner RICHTEK TECH