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Digital power supply control circuit and method

A technology for controlling circuits and digital power supplies, which is applied in the direction of control/regulation systems, electrical components, and adjustment of electrical variables. It can solve problems such as low control accuracy and analog control chip errors, and achieve simplified hardware structure, improved reliability, and eliminated temperature. drift effect

Active Publication Date: 2017-05-10
HUBEI SANJIANG AEROSPACE WANFENG TECH DEV
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Problems solved by technology

[0003] Aiming at the defects of the prior art, the purpose of the present invention is to provide a digital power control method, aiming at solving the problems of errors and low control precision in the analog control chip in the prior art

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  • Digital power supply control circuit and method
  • Digital power supply control circuit and method

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Embodiment Construction

[0031] 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.

[0032] The invention adopts digital control to overcome the shortcomings of the analog control chip in the DC / DC circuit of the full-bridge phase-shifting PWM switching power supply in the past, such as errors, aging, temperature influence, drift, non-linearity is not easy to compensate, and the control accuracy is low, etc., and the power supply is improved. Flexibility, adaptability and reliability. Here, the digital control method of the full-bridge phase-shifting PWM switching power supply is designed. On the basis of the theory of each link of the main circuit and the control circuit, a digita...

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Abstract

The invention provides a digital power supply control circuit and method. The digital power supply control circuit comprises an EMI filter, a filter capacitor, a phase-shifted full-bridge converter, a high-frequency transformer, a rectifier filter circuit, a driving protection circuit and a DSP control circuit. The phase-shifted full-bridge converter outputs high-frequency AC square wave voltage with adjustable pulse widths according to bus voltage. The high-frequency transformer is used for realizing electrical isolation and boosting. The DSP control circuit is used for sampling the output voltage and the output current, comparing the output voltage and the output current with reference values, and outputting a PWM control signal with a certain duty cycle according to a comparison result. The driving protection circuit is used for driving a switching tube in the phase-shifted full-bridge circuit to operate according to the PWM control signal. When a power supply generates over-voltage, over-current or an over-temperature fault, the driving protection circuit may switch off the switching tube in the phase-shifted full-bridge circuit according to the PWM control signal output from the DSP control circuit to realize the protection of a power device.

Description

technical field [0001] The invention belongs to the field of power supply technology, and more specifically relates to a digital power supply control circuit and method. Background technique [0002] In recent years, as a converter with excellent performance, the phase-shifted full-bridge converter has been widely used in medium and high-power converters. The accuracy of the parameters of the analog control chip components in the full-bridge phase-shifted PWM switching power supply DC / DC circuit And consistency, component aging, large power consumption, inflexible control and other problems still exist, and there are shortcomings such as error, aging, temperature influence, drift, non-linearity is not easy to compensate, and control accuracy is low. Contents of the invention [0003] In view of the defects of the prior art, the purpose of the present invention is to provide a digital power supply control method, aiming at solving the problems of errors and low control prec...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M1/32
CPCH02M1/32H02M3/33515
Inventor 梁美红贾红超乔洪涛常超卢联杰樊呐沈坤
Owner HUBEI SANJIANG AEROSPACE WANFENG TECH DEV
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