DC-DC converter and control method thereof

A control method, DC-DC technology, applied in control/regulation systems, conversion of DC power input to DC power output, instruments, etc., which can solve problems such as noise, reduction of switching frequency, and reduction of audio frequency range.

A control method, DC-DC technology, applied in control/regulation systems, conversion of DC power input to DC power output, instruments, etc., which can solve problems such as noise, reduction of switching frequency, and reduction of audio frequency range.

CN107707102AActive Publication Date: 2018-02-16深圳芯智汇科技有限公司
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  • DC-DC converter and control method thereof
  • DC-DC converter and control method thereof
  • DC-DC converter and control method thereof

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Embodiment Construction

[0048] Now in conjunction with the accompanying drawings, the preferred embodiments of the present invention will be described in detail.

[0049] Such as figure 1 Shown is a block diagram of an embodiment of a DC-DC converter of the present invention, and the DC-DC converter is used to convert a DC input voltage VIN into a DC output voltage VOUT. The DC-DC converter includes a switching tube M1 (usually called an upper tube, and other electronic switching devices such as MOSFETs can be used), a freewheeling tube M2 (also called a lower tube, and other electronic switching devices such as a MOSFET can be used), Inductor L, capacitor C, load R and control circuit 1. Wherein, the control circuit includes: a switch tube on control circuit 10 , a switch tube off control circuit 20 , and a freewheel tube off control circuit 30 .

[0050] The switch tube conduction control circuit 10 is used for generating a high level OnHs of the switch control signal HSG to control the switch tu...

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Abstract

The invention discloses a DC-DC converter and a control method thereof. The DC-DC converter comprises a follow current tube and a control circuit, wherein the control circuit is used for controlling the follow current tube to be conducted continuously starting from the moment that the inductive current of the DC-DC converter is decreased to zero from positive current; and the follow current tube is disconnected until the inductive current becomes negative current and the negative current reaches a reference current value. The control method of the DC-DC converter comprises the following steps:starting from the moment that the inductive current is decreased to zero from positive current, controlling the follow current to be conducted continuously, and disconnecting the follow current tubeuntil the inductive current becomes negative current and the negative current reaches the reference current value. Audio-frequency noise caused by the fact that the switching frequency is decreased into an audio frequency range can be avoided effectively.

Description

technical field [0001] The invention relates to the field of DC-DC converters, in particular to a DC-DC converter and a control method thereof. Background technique [0002] Switching power supplies based on DC-DC controllers are widely used in power management of electronic devices such as computers, tablet computers, and mobile phones. Devices, such as various chips therein, such as CPU chips, memory chips, and so on. [0003] When the load of the DC-DC controller decreases, in order to improve the efficiency, the DC-DC controller will enter the light-load mode and reduce the switching frequency of the switching tube to reduce the switching loss. Without any processing, the switching frequency will decrease as the load decreases, and eventually may decrease to the audio frequency range, causing audible noise to the human ear. Contents of the invention [0004] In order to overcome the deficiencies of the prior art, the present invention provides a DC-DC converter and a...

Claims

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Application Information

Patent Timeline
16 Feb 2018
Publication
CN107707102A
IPC
H02M1/08; H02M3/158; H02M1/32
CPC
H02M1/08; H02M1/32; H02M3/158
Inventors
段毅君