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Switch frequency hopping synchronous voltage reduction circuit

A technology of synchronous step-down and switching frequency, which is applied in the electronic field, can solve the problems of switching frequency jump and low efficiency of synchronous step-down circuit, and achieve the effect of improving efficiency

Inactive Publication Date: 2013-05-08
青岛联盟电子仪器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention proposes a synchronous step-down circuit with switching frequency hopping, which solves the problem of low efficiency of the existing synchronous step-down circuit under light load conditions

Method used

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Embodiment Construction

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0016] Such as figure 2 As shown, the switching frequency hopping synchronous buck circuit 100 of the present invention includes: an input port 101 for receiving an input voltage Vin; an output port 102 for providing an output voltage Vo; an upper power switch 103 and a lower power switch 104 connected in series Between the input port 101 and the reference ground; the output inductor 105, coupled between the series coupling node of the upper power switch 103 ...

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Abstract

The invention discloses a switch frequency hopping synchronous voltage reduction circuit which solves the problem that an existing synchronous voltage reduction circuit is low in efficiency under a light load state. The switch frequency hopping synchronous voltage reduction circuit comprises an input port, an output port, an upper power switch, a lower power switch, an output electric inductor, an output electric capacitor, a feedback assembly, a voltage comparer, a selective switch, a frequency comparer, a sawtooth wave generator and a control and driving circuit. The switch frequency hopping synchronous voltage reduction circuit can improve the efficiency of a synchronous voltage reduction circuit in a light load state.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a synchronous step-down circuit with switching frequency hopping. Background technique [0002] Synchronous buck circuits are usually used when the required voltage is lower than the voltage of the power supply. Typical synchronous buck circuits include such as figure 1 Upper power switch S1 , lower power switch S2 , output inductor L and output capacitor Co are shown coupled. The switching cycle of the existing synchronous step-down circuit is usually triggered by a clock signal with a fixed frequency, that is, the switching frequency is a clock frequency with a fixed value. The fixed switching frequency keeps the synchronous buck circuit highly efficient under heavy load conditions. However, in the light load state, if the switching frequency is still the switching frequency in the heavy load state, the efficiency of the synchronous buck circuit will decrease. Contents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/10
Inventor 王玲
Owner 青岛联盟电子仪器有限公司
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