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LDO power supply circuit

A power supply circuit, power supply technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of unstable output, circuit board fire, equivalent series resistance and capacitance value changes, etc., to achieve circuit flexibility, avoid Risk of fire, effect of avoiding high and low temperature effects

Inactive Publication Date: 2017-05-03
HUNAN CSR TIMES ELECTRIC VEHICLE
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AI Technical Summary

Problems solved by technology

However, the failure mode of tantalum electrolytic capacitors is short circuit, which can easily cause the circuit board to catch fire; aluminum electrolytic capacitors are easily affected by temperature, resulting in changes in equivalent series resistance and capacitance values, which cause LDO to self-oscillate and cause its output to be unstable.

Method used

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Embodiment Construction

[0027] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0028] Traditional linear regulators require the input voltage to be 2v to 3v higher than the output voltage, otherwise they cannot work normally. But in some cases, such conditions are too harsh, such as 5v to 3.3v, the voltage difference between input and output is only 1.7v, which obviously does not meet the conditions. In response to this situation, an LDO power conversion chip has emerged.

[0029] The...

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Abstract

The invention discloses an LDO power supply circuit comprising an LDO power supply and a capacitor. The capacitor is a ceramic capacitor of which one end is connected with the output end of the LDO power supply and the other end is connected to the ground. An aluminum electrolytic capacitor or a tantalum electrolytic capacitor is replaced by the scheme of arranging the ceramic capacitor to be connected in series with a small resistor so that the risk of fire of the capacitor can be avoided, the influence of high and low temperature can be avoided, and the circuit is enabled to be more flexible and reliable.

Description

technical field [0001] The invention relates to the technical field of power supply circuit design, in particular to an LDO power supply circuit. Background technique [0002] As the safety performance requirements of automobiles are getting higher and higher, the design of vehicle components should fully consider the various working conditions of the vehicle during operation, and minimize the problems caused by the defects of component design during vehicle operation. [0003] On the circuit board of an electric vehicle, an LDO (low dropout regulator, low dropout linear regulator) power supply is generally used to provide stable voltage for some key components. However, the LDO power supply cannot directly output a stable voltage, and its rear end must be connected to a capacitor with a certain equivalent series resistance to maintain the stability of the output voltage. Usually, a tantalum electrolytic capacitor or an aluminum electrolytic capacitor is used. However, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 肖小春罗家运杨洪波谢勇波王征宇陈慧民王宇
Owner HUNAN CSR TIMES ELECTRIC VEHICLE
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