A kind of circuit control method

A kind of circuit control method

  • CN 107,800,320 A
  • Filed: 09/27/2017
  • Published: 03/13/2018
  • Est. Priority Date: 09/27/2017
  • Status: Active Application
First Claim
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1. A kind of 1. circuit control method, it is characterised in that:

  • For controlling a high-frequency isolation ac-dc conversion circuit in rectification modeThe switch operating between inverter mode;

    The translation circuit is by a three-phase alternating current source, a DC source, the filter circuit being filtered to the three-phase alternating current source, simultaneouslyIt is inverse to be coupled to the filter capacitor of the DC source, high-voltage energy storage wave filter, three-phase full-bridge inverting circuit, the first to the second high frequency half bridgeBecome circuit, the first to the second inductance, the first to the second high-frequency isolation transformer, the first to the second rectification circuit, for drive openThe control circuit closed the drive circuit of pipe and be connected with the drive circuit is formed;

    Wherein, first and second high frequency everyPositioned at the first to the 3rd end of the DC source side and positioned at three-phase alternating current source side is respectively provided with from transformerFour and the 5th end;

    The filter circuit is connected to the exchanging between end of the three-phase alternating current source and the three-phase full-bridge inverting circuit;

    Described threePhase full bridge inverter is connected in parallel to the high-voltage energy storage wave filter by two DC terminal;

    The first high frequency half bridge inverter circuit and the second high frequency half bridge inverter circuit pass through respective two direct currents respectivelyEnd is connected in parallel to the high-voltage energy storage wave filter;

    Or the first high frequency half bridge inverter circuit and second high frequency half bridge it is inverseBecome circuit connected in series, and two by being formed after series connection DC terminals are connected in parallel to the high-voltage energy storage wave filter;

    The first high frequency half bridge inverter circuit first exchange end by first inductance connection to first high frequency everyFrom the 4th end of transformer, and, the second exchange end is connected to the 5th end of first high-frequency isolation transformer;

    The second high frequency half bridge inverter circuit first exchange end by second inductance connection to second high frequency everyFrom the 4th end of transformer, and, the second exchange end is connected to the 5th end of second high-frequency isolation transformer;

    First and second rectification circuit is the half-bridge or full bridge rectifier being made up of switching tube, and is respectively provided with twoExchange end and two DC terminals;

    Two exchange ends of first rectification circuit are respectively connecting to the first high-frequency isolation transformationThe first end of device and the 3rd end, and, two DC terminals are commonly connected to the negative pole of the DC source;

    Second rectification circuitTwo exchange ends be respectively connecting to first end and the 3rd end of second high-frequency isolation transformer, and, two DC terminalsIt is commonly connected to the negative pole of the DC source;

    Second end of first and second high-frequency isolation transformer is connected to the positive pole of the DC source;

    The control method includes:

    When judging that the translation circuit need to work in rectification mode:

    The three-phase full-bridge inverting circuit is controlled to work in PFCRectification state is simultaneously boosted;

    The first, second high frequency half bridge inverter circuit is controlled to work in inverter mode;

    If the direct currentElectric current is received more than or equal to 0.1 times of rated current in source, then:

    First and second rectification circuit is driven with pwm signalAll switching tubes it is open-minded;

    Wherein, the on/off sequential of the switching tube of first rectification circuit is with first high frequency halfEnter line displacement based on the center of the on/off sequential of bridge inverter circuit, the opening of the switching tube of second rectification circuit/Shut-off sequential enters line displacement, and root based on the center of the on/off sequential of the second high frequency half bridge inverter circuitDutycycle size is opened to improve efficiency according to switching frequency adjustment;

    When judging that the translation circuit need to work in inverter mode:

    According to the voltage of the DC source, control described firstHigh frequency half bridge inverter circuit carries out on/off based on the center of the on/off sequential of first rectification circuit, withAnd enter based on the center of on/off sequential of control the second high frequency half bridge inverter circuit by second rectification circuitRow on/off, and enter line displacement and adjust to open dutycycle size to improve effect according to the voltage levels of the DC sourceRate;

    Wherein, the on/off sequential of the first high frequency half bridge inverter circuit and the second high frequency half bridge inverter circuit is same90 °

    of phase or misphase.

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