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Light load mode maintaining circuit for DC-DC converter and control method thereof

A technology for maintaining circuits and converters, applied to control/regulation systems, output power conversion devices, instruments, etc., to achieve the effect of maintaining stability

Pending Publication Date: 2022-04-12
SOUTHCHIP SEMICON TECH SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem that the existing circuit cannot efficiently avoid the single-state lockup caused by some unknown conditions in a single logic state, the present invention proposes a light-load mode maintenance circuit for a DC-DC converter and a control method thereof

Method used

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  • Light load mode maintaining circuit for DC-DC converter and control method thereof

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Embodiment Construction

[0013] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0014] In order to allow the circuit to efficiently maintain the light-load mode after entering the light-load mode, the present invention uses a random number method to adjust the internal state of the circuit accordingly. The random number method can prevent the circuit from latching under a single condition Unable to withdraw, improving yield.

[0015] Such as figure 1 As shown, the circuit proposed by the present invention includes a random counter, a high duty detection circuit, and HYS_CONTROL. HYS_CONTROL is the internal hysteresis control circuit. After receiving the HD signal, the module keeps the circuit in a high duty state by increasing the on timer time of the internal circuit. This circuit is not the core of this patent, so it will not be explained in detail here.

[0016] The counting counters are used to generate different cycle detection signals, a...

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Abstract

The invention belongs to the technical field of analog integrated circuits, and particularly relates to a light load mode maintaining circuit for a DC-DC converter and a control method of the light load mode maintaining circuit. According to the invention, the random counter is additionally arranged in the circuit, different states for exiting high duty are generated through the random sequence, and the control method of the random number can effectively avoid the situation that a system always adopts wrong judgment conditions to generate corresponding wrong results if the judgment conditions have problems, so that the system can correctly exit the high duty, and the accuracy of the system is improved. And the stability of the system is maintained.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuits, and in particular relates to a light-load mode maintenance circuit for a DC-DC converter and a control method thereof. Background technique [0002] The working state in light load mode has been researched by various manufacturers and colleges at present, because in light load mode, for the current popular current control system, it is difficult for the current loop to obtain the information of the inductor current in light load mode, so that it is easier to It is difficult to effectively control the system. A general circuit may add a dummy load to the system, that is, when the circuit detects that the system is in light-load mode, a corresponding flag signal is generated inside the system to turn on an internally set current source. It makes the system avoid the very light load mode, but this way will consume current and cause unnecessary current consumption, especially for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156H02M1/00
CPCY02B70/10
Inventor 王宇王佳煜
Owner SOUTHCHIP SEMICON TECH SHANGHAI CO LTD