A power conversion circuit

Abstract

The invention discloses a power conversion circuit, comprising: a step-down module, which is used to reduce the input voltage to a preset low voltage value; a boost module, which is used to reduce the input voltage or the The preset low voltage value is raised to the target voltage; a voltage clamping module, the voltage clamping module is used to keep the target voltage within a preset voltage range; a filtering module, the filtering module is used to filter out the ripple in the target voltage; at least one output module for supplying power to a load. Compared with the LDO circuit in the prior art, the power conversion circuit achieves the purpose of multi-channel output power supply. When adding one output power supply, only one field effect transistor needs to be added. The circuit structure is simple and easy to expand. power supply for analog integrated circuits.

Description

technical field [0001] The present invention relates to the technical field of power conversion circuits for integrated circuits, and more specifically, to a power conversion circuit. Background technique [0002] With the continuous development of science and technology, various electronic devices have been widely used in people's daily life and work, bringing great convenience to people's life and work. [0003] Based on the analog integrated circuit, when the input voltage range is large, a power conversion module is generally required to convert the wide-range input voltage into a lower constant voltage to supply power to the internal circuit. [0004] The traditional power conversion method is to integrate an LDO (Low Dropout Regulator, low-voltage linear regulator) inside the chip. The LDO uses a transistor operating in the linear region to subtract the excess voltage from the applied input voltage to generate a regulated The output voltage. [0005] LDO has the adva...

AI Technical Summary

Problems solved by technology

[0005] LDO has the advantage of high output voltage accuracy, but it needs to provide a reference voltage on the bandgap reference, and it also involves complex feedback loop compensation. The design complexity is very high, and it will occupy a large chip area.

Based on some analog integrated circuits, the precision requirement of the power supply voltage is not very high, only the power supply voltage is required to be within the safe range, and the internal circuit will not be burned, and the power supply capacity requirement is not very high, usually below the mA level. In some cases, continuing to use LDO will cause an unnecessary increase in cost

[0006] At present, there is no simple and reliable technology that can generate multiple output power supplies. For example, an LDO can only generate one output power supply. If you want to output two-channel power supplies, you need to make two LDOs, which occupies a greater degree of chip area.

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