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Voltage divider capacity voltage deviation feedforward control circuit of current control type semibridge transducer

A half-bridge converter, voltage deviation technology, applied in the voltage divider capacitor voltage deviation feedforward control circuit, power electronic power conversion field, can solve the problem of voltage divider capacitor voltage imbalance and other problems, achieve good voltage equalization effect, low cost Effect

Inactive Publication Date: 2004-07-21
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0016] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a method that can fundamentally solve the problem of voltage imbalance of the voltage dividing capacitor, eliminate the distortion of the output voltage and output current, improve circuit performance, improve circuit efficiency, and reduce system loss.

Method used

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  • Voltage divider capacity voltage deviation feedforward control circuit of current control type semibridge transducer
  • Voltage divider capacity voltage deviation feedforward control circuit of current control type semibridge transducer
  • Voltage divider capacity voltage deviation feedforward control circuit of current control type semibridge transducer

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Embodiment Construction

[0029] From Figure 1 with figure 2 It can be seen that the present invention inputs the capacitance midpoint deviation voltage Δu into the capacitance midpoint voltage deviation feedforward circuit composed of a proportional amplifier K and a proportional-integral (PI) adjustment circuit in the original control circuit of the half-bridge converter. The output of the voltage deviation feedforward circuit is used as the feedforward current i n Connected to the current comparator, the reference voltage u r and feedback voltage u of The compared error signal passes through the voltage regulator as the current given signal, and is also connected to the current comparator. Cross-cut comparator) is connected, and the hysteresis comparator (or carrier cross-cut comparator) controls the power switch tube in the main circuit through the drive circuit.

[0030] The working principle is: the capacitor midpoint deviation Δu is adjusted by proportional integral (PI adjustment) to obtain...

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Abstract

In control circuit of half bridge convertor, after bias voltage at middle point of capacitance is leaded in circuit of bias voltage at middle point of capacitance composed of proportional integral controller, current generated is fed forward to current comparator. With being leaded in voltage comparator, the reference voltage and feedback voltage are connected to voltage regulator to generate given current, and then connected to the current comparator. The current feedback signal, current feedforward and given signals through the current comparator are connected to hysteresis comparator (or carrier comparator). The hysteresis comparator through the drive circuit controls the main circuit of convertor. The said bias voltage feedforward control and inductive current in half bridge convertor create part of DC component, which balances amperesecond value so as to remove DC bias in voltage at middle point of capacitance.

Description

technical field [0001] The current control type half bridge converter of the present invention belongs to the electric power electronic power conversion technology. Background technique [0002] With the rapid development of power electronics technology, the performance requirements of power converters are getting higher and higher. Current power converters generally use current-mode control technology. The current mode control technology is to use the error signal of the voltage as the given current, and then use the error signal of the current as the input of the pulse width modulation (PWM) controller to generate a PWM control signal to control the on and off of the power device, thus Realize high-performance control of power converters. The current mode control technology has the characteristics of excellent output performance, good system stability, fast dynamic response, and inherent current limiting protection. [0003] In the power converter circuit topology, the h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00H02M1/08
Inventor 谢少军陈东华
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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