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US 10,122,299 B2Granted
Power conversion device
AssigneeHitachi, Ltd.
InventorsTakashi Ogawa, Kimihisa Furukawa, Junichi Sakano
Life of this patent
Estimating the term…
Abstract
The present invention relates to a power conversion device in the power electronics field. An object of the present invention is to provide a technique of determining whether a switching element operates normally or not from a gate monitor signal of a power conversion device, and predicting a sign of a failure by obtaining the temperature of the switching element from a transient state of the switching voltage of the power conversion circuit as a component of the power conversion device without using a new signal path.
Claims4
A power conversion device comprising:
- a power conversion circuit performing power conversion by switching operation of a semiconductor switching element;
- a signal processing circuit controlling switching operation of the power conversion circuit;
- a gate drive circuit applying a drive signal to a control terminal of the power conversion circuit on the basis of an output signal of the signal processing circuit;
- a gate signal monitor circuit generating a monitor signal on the basis of drive voltage and drive current of the gate drive circuit;
- a filter circuit shaping an output signal of the gate monitor circuit;
- a voltage detection circuit detecting switching voltage of the power conversion circuit;
- a temperature detection circuit calculating temperature of the semiconductor switching element from the switching voltage from the voltage detection circuit and outputting a temperature detection signal;
- and
- an optical communication module transmitting a control signal from the signal processing circuit to the gate drive circuit and transmitting a gate monitor signal from the filter circuit to the signal processing circuit,
- wherein a synthesis circuit synthesizing the gate monitor signal and the temperature detection signal is provided between the filter circuit and the optical communication module,
- wherein an optical module receiving a signal from the synthesis circuit, converting the signal to an optical signal, and transmitting the optical signal, and
- an optical module receiving the optical signal are provided,
- wherein a separation circuit separating the optical signal to a gate monitor signal and a temperature detection signal is provided between the optical module receiving the optical signal and the signal processing circuit, and
- wherein means which calculates temperature of the switching element on the basis of the temperature detection signal by the signal processing circuit is provided.
11 more elements
A power conversion device comprising:
- a power conversion circuit performing power conversion by switching operation of a semiconductor switching element;
- a signal processing circuit controlling switching operation of the power conversion circuit;
- a gate drive circuit applying a drive signal to a control terminal of the power conversion circuit on the basis of an output signal of the signal processing circuit;
- a gate signal monitor circuit generating a monitor signal on the basis of drive voltage and drive current of the gate drive circuit;
- a filter circuit shaping an output signal of the gate monitor circuit;
- a voltage detection circuit detecting switching voltage of the power conversion circuit;
- a temperature detection circuit calculating temperature of the semiconductor switching element from the switching voltage from the voltage detection circuit and outputting a temperature detection signal;
- and
- an optical communication module transmitting a control signal from the signal processing circuit to the gate drive circuit and transmitting a gate monitor signal from the filter circuit to the signal processing circuit,
- wherein a synthesis circuit synthesizing the gate monitor signal and the temperature detection signal is provided between the filter circuit and the optical communication module,
- wherein an optical module receiving a signal from the synthesis circuit, converting the signal to an optical signal, and transmitting the optical signal, and
- an optical module receiving the optical signal are provided,
- wherein a separation circuit separating the optical signal to a gate monitor signal and a temperature detection signal is provided between the optical module receiving the optical signal and the signal processing circuit, and
- wherein the signal processing circuit calculates temperature of the switching element on the basis of the temperature detection signal.
11 more elements
Dependencies are inferred from the claim text.