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Digital-analog hybrid control circuit and control method of DC-DC converter

A DC-DC, digital-analog hybrid technology, applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve problems such as poor steady-state accuracy, improve transient performance, and simplify control loops Road, the effect of high precision voltage regulation

Active Publication Date: 2021-04-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Description
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Problems solved by technology

Compared with the control of pulse width modulation, the transient performance of the switching converter using the control method of pulse frequency modulation is good, but the steady state accuracy is poor

Method used

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  • Digital-analog hybrid control circuit and control method of DC-DC converter

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Embodiment Construction

[0045] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The specific details in the embodiments described below, such as the specific circuit structure in the embodiments and the specific parameters of these circuit elements, are used to provide a better understanding of the embodiments of the present invention, and those skilled in the art can understand that even Embodiments of the invention may be practiced without some of the details or with other methods, elements, materials, etc. combinations.

[0046] The present invention proposes a digital-analog hybrid control circuit and control method for a DC-DC converter. The following is an example of applying the present invention to a BUCK converter. Of course, the control circuit and control method of the present invention can also be applied to other types The DC-DC converter. Such as figure 1 As shown, the BUCK converter includes two switching ...

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Abstract

The invention relates to a digital-analog hybrid control circuit and a control method of a DC-DC converter. Inductance voltage is converted into current, and a first current controls an oscillator to generate a corresponding frequency signal as a clock of a digital filter; the digital filter performs calculation according to the PWM signal in each clock period so as to generate an inductive current digital signal with the same phase as the inductive current; on one hand, the difference between the output voltage and the reference voltage of the DCDC converter is converted into a digital signal by the analog-to-digital converter and then a compensation signal is obtained by the digital compensator, and on the other hand, the output voltage and the reference voltage are processed into a current iico 2 by the second transconductance amplifier and converted into a frequency signal by the second current control oscillator to serve as a clock of the second counter. The second counter starts counting at the falling edge of the PWM signal, and the PWM rising edge stops counting and is reset, so that a slope signal is generated; the compensation signal and the slope signal are added and then compared with an inductive current digital signal, when the inductive current digital signal is smaller, the PWM signal is controlled to be turned up, and after fixed conduction time, the PWM signal is turned down.

Description

technical field [0001] The invention belongs to the field of integrated circuits and switching power supplies, and relates to a digital-analog hybrid control circuit and a control method of a DC-DC converter. Background technique [0002] In recent years, the development of electronic technology is getting faster and faster, and the requirements for the performance of switching power supplies are getting higher and higher. The switching power supply is mainly composed of a switching converter and a control circuit. Switching converters mainly include buck, boost, buck-boost, half-bridge, full-bridge, forward, flyback and other topologies. The control circuit is used to monitor the working state and output signal of the switching converter, and at the same time generate a pulse control signal to control the switching tube to adjust and stabilize the output. At present, the switching power supply is constantly developing towards the following aspects: 1. High frequency, smal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02M1/08
CPCH02M1/08H02M3/158
Inventor 甄少伟胡怀志白正杨王睿谢泽亚张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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