Power conversion device
AssigneeMitsubishi Electric Corporation
InventorMao KAWAMURA
Life of this patent
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Abstract
The present application provides a power conversion device such that input current and output current can be accurately estimated without providing a special circuit. A DC-DC converter including a control unit and semiconductor switching elements is such that a current detecting current transformer is connected in series between a high voltage battery and the semiconductor switching elements, in addition to which the DC-DC converter includes a current-to-voltage conversion circuit on a secondary side of the current transformer, and the control unit estimates an input current from an AD conversion value input from the current-to-voltage conversion circuit.
Claims9
A power conversion device, comprising:
- an inverter device that is connected to an input power supply generating a direct current voltage, has a multiple of switching elements, and converts the direct current voltage into an alternating current voltage by switching between an on-state and an off-state of the switching elements;
- a transformer that has a primary winding and a secondary winding, converts a voltage applied across the primary winding by the inverter device into a differing voltage, and outputs the differing voltage to the secondary winding;
- a rectifying circuit that rectifies an alternating current voltage output from the secondary winding of the transformer;
- a smoothing reactor that smoothes an output from the rectifying circuit;
- a smoothing capacitor that smoothes a voltage waveform of a current flowing through the smoothing reactor, and outputs the smoothed voltage waveform as an output voltage;
- a control unit that controls the switching elements so as to be turned on and off;
- an input current detecting circuit that has a first winding and a second winding magnetically coupled to the first winding, wherein the first winding is connected in series between the input power supply and the switching elements;
- and
- a current-to-voltage conversion circuit connected to the second winding of the input current detecting circuit, wherein
- a voltage output from the current-to-voltage conversion circuit is input as an AD conversion value into the control unit, and the control unit estimates a current input into the inverter device from the AD conversion value.
Dependencies are inferred from the claim text.