Power conversion apparatus
First Claim
1. A power conversion apparatus, comprising:
- a power semiconductor module having one pair or pairs of semiconductor switching devices which are connected in series to form one half-bridge circuit or half-bridge circuits and which are driven to be ON/OFF while being associated with one another, and a plurality of flywheel diodes back-to-back connected to the semiconductor switching devices respectively;
a control circuit which is provided to be separately isolated from the power semiconductor module and which drives the semiconductor switching devices to be ON/OFF respectively;
current detection circuits which detect currents flowing in the half-bridge circuits through current detection terminals provided in ones of the semiconductor switching devices forming the half-bridge circuits in the power semiconductor module and current detection terminals provided in the flywheel diodes back-to-back connected to the ones of the semiconductor switching devices;
sample-and-hold circuits which hold voltages corresponding to the currents detected through the current detection circuits for a predetermined period of time; and
insulating circuits which transmit the voltages held by the sample-and-hold circuits to the control circuit;
wherein;
voltage signals given from the sample-and-hold circuits through the insulating circuits are inputted to the control circuit after gains and offsets of the voltage signals are regulated through voltage regulation circuits.
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Accused Products
Abstract
A current flowing into one of half-bridge circuits of a power semiconductor module is detected by corresponding ones of current detection circuits through a current detection terminal provided in corresponding ones of semiconductor switching devices forming the half-bridge circuits and a current detection terminal provided in corresponding ones of flywheel diodes back-to-back connected to the corresponding ones of the semiconductor switching devices. A pulse voltage waveform indicating the current detected by the corresponding ones of the current detection circuits is held for a predetermined period and converted into a stepwise voltage waveform by use of corresponding ones of sample-and-hold circuits, so that the voltage held by the corresponding ones of the sample-and-hold circuits is transmitted to a control circuit through corresponding ones of insulating circuits.
10 Citations
6 Claims
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1. A power conversion apparatus, comprising:
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a power semiconductor module having one pair or pairs of semiconductor switching devices which are connected in series to form one half-bridge circuit or half-bridge circuits and which are driven to be ON/OFF while being associated with one another, and a plurality of flywheel diodes back-to-back connected to the semiconductor switching devices respectively; a control circuit which is provided to be separately isolated from the power semiconductor module and which drives the semiconductor switching devices to be ON/OFF respectively; current detection circuits which detect currents flowing in the half-bridge circuits through current detection terminals provided in ones of the semiconductor switching devices forming the half-bridge circuits in the power semiconductor module and current detection terminals provided in the flywheel diodes back-to-back connected to the ones of the semiconductor switching devices; sample-and-hold circuits which hold voltages corresponding to the currents detected through the current detection circuits for a predetermined period of time; and insulating circuits which transmit the voltages held by the sample-and-hold circuits to the control circuit; wherein; voltage signals given from the sample-and-hold circuits through the insulating circuits are inputted to the control circuit after gains and offsets of the voltage signals are regulated through voltage regulation circuits. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification