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DC-DC converter control circuit and converter

A DC-DC and control circuit technology, applied in the circuit field, can solve problems such as the part of the startup circuit not working normally, and achieve the effect of ensuring normal startup

Active Publication Date: 2012-01-25
ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the embodiments of the present invention is to provide a DC-DC converter control circuit, aiming to solve the problem that in the existing low-voltage start-up scheme of the step-up DC-DC converter, when the input voltage VIN is low to a certain level, it may cause the start-up The problem that the circuit part does not work properly

Method used

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  • DC-DC converter control circuit and converter

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Embodiment Construction

[0014] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0015] In the embodiment of the present invention, by automatically comparing and switching the input voltage VIN and the output voltage VOUT, it is ensured that the startup circuit and the driving circuit in the step-up DC-DC converter can still work normally when the VIN is as low as 0.9V.

[0016] figure 2 The structural principle of the step-up DC-DC switching power supply converter provided by the present invention is shown, and for the convenience of description, only the parts related to the embodiment of the present invention are shown.

[0017] The dotted box is the DC-DC converter contr...

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Abstract

The invention is suitable for the field of circuits, and provides a boosting DC-DC converter control circuit and a converter. The boosting DC-DC converter control circuit comprises a main control circuit, a starting circuit and a drive circuit. The boosting DC-DC converter control circuit also comprises a power supply switching circuit, wherein the power supply switching circuit is used for comparing an input voltage with an output voltage of the converter, switching into high-voltage output and supplying power to the starting circuit and the drive circuit. According to the invention, the input voltage VIN and the output voltage VOUT are automatically compared and switched, and a high voltage is selected for supplying power to the starting circuit and the drive circuit, thus the problem that partial starting circuit can not normally work when the input voltage VIN is lowered to 0.9V in the traditional circuit is solved, and normal starting of the boosting DC-DC converter is ensured.

Description

technical field [0001] The invention belongs to the field of circuits, in particular to a DC-DC converter control circuit and the converter. Background technique [0002] Currently, DC-DC switching power converters are widely used in handheld devices and portable electronic products due to the advantages of high conversion efficiency. In some current portable electronic products, only one AA battery is used, and then powered by a step-up DC-DC converter system. Since the voltage of a single AA battery is relatively low, especially as low as 0.9V when the battery power is relatively low, it is necessary to solve the problem of low-voltage start-up in the design of the boost circuit. [0003] In current practical applications, the commonly used figure 1 The boost DC-DC converter low voltage start-up solution shown. Such as figure 1 As shown, the DC-DC converter control circuit is shown in the dotted box, including an NMOS power transistor integrated in the chip, and three ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08H02M1/36H02M3/158
Inventor 梁仁光胡胜发
Owner ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD
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