Abstract: Aspects of the invention include a power conversion device control device, including multiple drive circuits having an alarm signal formation circuit that sets a pulse signal having as one cycle a period. The one cycle period includes a determination period, of which a different period is set for each of plural protection circuits that detect information for carrying out a protection operation of semiconductor elements configuring a power conversion device, and a constant period, in which a condition varies with respect to the determination period, takes a protection circuit for which it is first detected that a protection operation is necessary to be a first-come first-served protection circuit, and outputs the pulse signal corresponding to the first-come first-served protection circuit as an alarm signal, wherein the alarm signal formation circuit is such that a resetting condition of the alarm signal is a condition that a protection operation stopped condition.

Abstract: A driving device for driving a semiconductor element can include a plurality of protection circuits that detect information necessary for performing protection operation for semiconductor elements that include a power conversion apparatus, a pulse signal generation circuit that sets a pulse sequence signal with a pulse width differently for each of the protection circuits and outputs a pulse sequence signal corresponding to the protection circuit that has been first detected a need for protection operation. The device can also include an alarm signal forming circuit that forms an alarm signal by ON-OFF control of a switching element and externally outputs the alarm signal, and a protection operation state discrimination circuit that discriminates existence of a protection operation state based on the alarm signal from the alarm signal forming circuit, and an alarm control circuit that delivers the pulse sequence signal outputted from the pulse signal generation circuit.

Abstract: A semiconductor device of the present invention determines an overheat state by comparing a forward voltage drop of a temperature sensing diode with a reference voltage, and in addition includes a series regulator circuit composed of an amplifier and resistors, that receives the forward voltage drop of a temperature sensing diode and delivers an output voltage as temperature information to an external output terminal for temperature detection of the semiconductor device. Such a device can continuously detect the temperature of the semiconductor chip.

Abstract: A driving device for driving a semiconductor element can include a plurality of protection circuits that detect information necessary for performing protection operation for semiconductor elements that include a power conversion apparatus, a pulse signal generation circuit that sets a pulse sequence signal with a pulse width differently for each of the protection circuits and outputs a pulse sequence signal corresponding to the protection circuit that has been first detected a need for protection operation. The device can also include an alarm signal forming circuit that forms an alarm signal by ON-OFF control of a switching element and externally outputs the alarm signal, and a protection operation state discrimination circuit that discriminates existence of a protection operation state based on the alarm signal from the alarm signal forming circuit, and an alarm control circuit that delivers the pulse sequence signal outputted from the pulse signal generation circuit.

Abstract: A driver circuit facilitates reducing noises and losses and improving the driving performances thereof without connecting a series circuit of capacitor and a resistor to the gate of IGBT. The driver circuit includes a slope setting circuit that sets the gate voltage waveform of IGBT; and an operational amplifier that includes a non-inverting input terminal, to which an output voltage V* from slope setting circuit is inputted, and an inverting input terminal, to which a divided voltage Vgsf divided by resistors is inputted; and the operational amplifier outputs an output voltage Vout, proportional to the difference between the output voltage V* and the divided voltage Vgsf, to the gate of IGBT.

Abstract: A phase adjusting circuit is provided that is capable of adjusting a delay time at a rise or fall of a driving signal for driving an inverter. A phase adjusting circuit is provided upstream of a driver circuit, and an output from a hysteresis comparator is input to the driver circuit through the phase adjusting circuit. The phase adjusting circuit delays at least either rise or fall of the signal input to the driver circuit to adjust any difference between the pulse width of the input signal input to the driver circuit and the pulse width of a signal output from a switching element of an inverter driven by the driver circuit.

Abstract: A drive circuit for an insulated gate device includes a constant current source generating a constant current, and a switching circuit, wherein a gate of the insulated gate device is connected to a power supply potential side via the constant current source at the time of turn-on and to a ground potential side at the time of turn-off. Whereby a drive circuit for the insulated gate device can be reduced loss at the time of turn-on and reduced temperature dependency of noise.

Abstract: A driver circuit facilitates reducing noises and losses and improving the driving performances thereof without connecting a series circuit of capacitor and a resistor to the gate of IGBT. The driver circuit includes a slope setting circuit that sets the gate voltage waveform of IGBT; and an operational amplifier that includes a non-inverting input terminal, to which an output voltage V* from slope setting circuit is inputted, and an inverting input terminal, to which a divided voltage Vgsf divided by resistors is inputted; and the operational amplifier outputs an output voltage Vout, proportional to the difference between the output voltage V* and the divided voltage Vgsf, to the gate of IGBT.

Abstract: A phase adjusting circuit is provided that is capable of adjusting a delay time at a rise or fall of a driving signal for driving an inverter. A phase adjusting circuit is provided upstream of a driver circuit, and an output from a hysteresis comparator is input to the driver circuit through the phase adjusting circuit. The phase adjusting circuit delays at least either rise or fall of the signal input to the driver circuit to adjust any difference between the pulse width of the input signal input to the driver circuit and the pulse width of a signal output from a switching element of an inverter driven by the driver circuit.

Abstract: A drive circuit for an insulated gate device includes a constant current source generating a constant current, and a switching circuit, wherein a gate of the insulated gate device is connected to a power supply potential side via the constant current source at the time of turn-on and to a ground potential side at the time of turn-off. Whereby a drive circuit for the insulated gate device can be reduced loss at the time of turn-on and reduced temperature dependency of noise.