Circuit control method and electronic equipment

By introducing disturbances into the PWM drive control circuit and the ADC path, the problem that the PWM controller in the prior art is prone to ripple when adjusting the voltage output is solved, and the effect of improving the output voltage accuracy and reducing the output ripple without changing the PWM frequency and inductance capacitance value is achieved.

CN119696330APending Publication Date: 2025-03-25BEIJING SHICHANGDING TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202411799573.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-09
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

Existing PWM controllers are prone to ripple problems when adjusting voltage output, and increasing the PWM frequency is difficult for analog DC-DC, especially due to the limitations of integrator capacitance.

Method used

The disturbance is introduced in the ADC path of the PWM drive control circuit and the sampling unit, which is used to reduce the ripple caused by the PWM and to increase the effective bit of the ADC, respectively. The specific method includes introducing a uniformly distributed first disturbance into the PWM drive control circuit and introducing a normal distribution, a Gaussian distribution, or a Rayleigh distribution second disturbance in the ADC path.

Benefits of technology

Without changing the PWM frequency and PWM count bit width and output inductance and capacitance values, the power supply voltage output accuracy is improved and the output ripple is reduced.

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Abstract

The invention provides a circuit control method and electronic equipment. The circuit comprises a PWM control circuit, a sampling unit, a PWM drive control circuit and a control logic unit, the PWM control circuit, the sampling unit and the PWM drive control circuit are all connected with the control logic unit; the method comprises the steps that first disturbance is introduced into a PWM drive control circuit, and the first disturbance is used for reducing ripple waves caused by PWM; a second perturbation is introduced in the ADC path of the sampling unit of the circuit, the second perturbation being used to boost the significant bit of the ADC. In the mode, under the condition that the PWM frequency, the PWM counting bit width and the output inductance and capacitance value are not changed, the power supply voltage output precision can be improved, and the output ripple can be reduced.
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