Inverter circuit
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsToru Iwagami, Mamoru Seo
Life of this patent
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Abstract
An inverter circuit includes an IGBT (3) and an IGBT (4) connected in series between a power supply potential (Vcc) and a GND potential, and an HVIC (1) and an LVIC (2) for respectively controlling actuation of the IGBTs (3) and (4). The inverter circuit also includes a capacitor (5), a diode (6), and a resistor (7). The capacitor (5) is connected between a terminal (VS) and the GND potential. The diode (6) has a series connection to the capacitor (5) between the terminal (VS) and the GND potential, with such a polarity that a forward current flows from the GND potential to the terminal (VS). The resistor (7) is connected in parallel to the capacitor (5).
Claims15
An inverter circuit, comprising:
- a high-voltage switching element and a low-voltage switching element connected in series between a power supply potential and a GND potential;
- a high-voltage drive circuit including a first terminal coupled to a control terminal of the high-voltage switching element, a second terminal connected to said GND potential, and a low-potential inner circuit including a one-shot circuit coupled between the first and second terminals and configured for controlling actuation of the high-voltage switching element through the first terminal, the second terminal connected to said GND potential supplying a reference potential to the low-potential inner circuit;
- and
- a diode connected between said second terminal and said GND potential, with such a polarity that a forward current flows from said second terminal to said GND potential, wherein
- the control terminal of the high-voltage switching element, the first terminal, the low-potential inner circuit, the second terminal, and the diode are electronically and serially coupled in that order.
An inverter circuit, comprising:
- a high-voltage switching element and a low-voltage switching element connected in series between a power supply potential and a GND potential;
- a high-voltage drive circuit including a first terminal coupled to a control terminal of the high-voltage switching element, a second terminal connected to said GND potential, and a low-potential inner circuit including a one-shot circuit coupled between the first and second terminals and configured for controlling actuation of the high-voltage switching element through the first terminal, the second terminal connected to said GND potential supplying a reference potential to the low-potential inner circuit;
- and
- a surge voltage suppressing element connected between said second terminal and said GND potential for suppressing a surge voltage resulting from turn-off of the high-voltage switching element.
Dependencies are inferred from the claim text.