Digital control system and method for step-up DC DC converter peak voltage

A peak voltage, direct current technology, applied in control/regulation systems, DC power input conversion to DC power output, output power conversion devices, etc., can solve the problem of affecting system response speed, reducing system dynamic performance, large delay, etc. problems, to achieve the effect of improving dynamic performance, compensating for delay problems, and improving response speed

Inactive Publication Date: 2018-08-21
XIDIAN UNIV
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  • Claims
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Problems solved by technology

However, the shortcomings of this system are: the characteristics of the digital control method itself make the system have a problem of large delay, which affects the response speed of the system and reduces the dynamic performance of the system.

Method used

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  • Digital control system and method for step-up DC DC converter peak voltage
  • Digital control system and method for step-up DC DC converter peak voltage
  • Digital control system and method for step-up DC DC converter peak voltage

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Embodiment Construction

[0044] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0045] refer to figure 1 , one A digital control system for the peak voltage of a step-up DC-DC converter, including a power stage circuit and a feedback control circuit.

[0046] The power stage circuit includes an inductor L, a switch tube S 1 , rectifier diode S 2 , capacitance C, capacitance equivalent series resistance R e and load resistor R L ; The positive pole of the inductor L is connected to the positive pole of the external input DC source; the switch tube S 1 The source of the ground; the rectifier diode S 2 The negative pole of the power stage circuit is connected to the output voltage terminal, and the positive pole is connected to the negative pole of the inductor L and the switch tube S 1 The drain of the capacitor C is connected; the positive electrode of the capacitor C is connected to the output voltage termi...

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Abstract

The invention discloses a digital control system and a method for step-up DC DC converter peak voltage, so as to solve the technical problem that the existing digitally-controlled step-up DC DC converter has a slow response speed. The method comprises steps: parameters are set; a sampling module samples output voltage of a power stage circuit; an analog-to-digital conversion (ADC) module carries out analog-to-digital conversion on the sampling signals; a digital proportional integral differential (DPID) module acquires control signals; a digital peak voltage prediction module calculates the duty cycle of an nth switching period of the power stage circuit switching transistor; a digital pulse width modulation (DPWM) module acquires gate driving signals; and peak voltage after the nth switching period of output voltage of the power stage circuit is controlled. The response speed of the control system can be effectively improved, the output voltage waveform of the converter is more stable, and the dynamic performance of the control system can be effectively improved.

Description

technical field [0001] The invention belongs to the control field of DC-DC converters, relates to a control system and method of DC-DC converters, in particular to a digital control system and method of step-up DC-DC converters, which can be used in portable equipment, automotive electronics and other fields . Background technique [0002] In electronic equipment, the switching converter module is one of the indispensable modules. With the rapid development of electronic equipment, the switching converter module has also been widely used. Switching converters are further divided into DC-DC converters and AC-DC converters, and DC-DC converters are further divided into boost DC-DC converters, step-down DC-DC converters and buck-boost DC-DC converters. The step-up DC-DC converter converts the externally input DC voltage into a higher DC voltage and outputs it. Its control mode is divided into analog control and digital control. The analog control mode usually uses discrete com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/157
CPCH02M3/157
Inventor 李先锐李梦娇张志远张凯赖彭宇刘栋
Owner XIDIAN UNIV
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