Title:
SHORT-CIRCUIT PROTECTION CIRCUIT, SEMICONDUCTOR DEVICE, AND SHORT-CIRCUIT PROTECTION METHOD
Document Type and Number:
WIPO Patent Application WO/2024/024138
Kind Code:
A1
Abstract:
A short-circuit protection circuit according to the present invention is provided with: a voltage dividing circuit that divides a power supply voltage supplied from a power supply connected at one end; a semiconductor rectifying element, one end of which is connected between resistance elements of the voltage dividing circuit and the other end of which is connected onto a path of a conductive wire connected to a current-inflow-side terminal of a semiconductor switch element to be protected, the connection being made so that the direction from the one end to the other end becomes a rectifying direction; an RC parallel circuit connected to the other end of the voltage dividing circuit; and a drive unit that, when the semiconductor switch element is turned on, turns off the semiconductor switch element when detecting, on the basis of the voltage of a capacitor element of the RC parallel circuit, that a short-circuit current is flowing in the conductive wire. The stray capacitance of the semiconductor rectifying element satisfies the condition that, when a short-circuit current flows into the conductive wire, the voltage at one end of the capacitor element of the RC parallel circuit, the one end being connected to the voltage dividing circuit, becomes higher than the voltage at the other end of the capacitor element.
Inventors:
NAKAGAMI TAKASHI (JP)
YOSHINO YUSUKE (JP)
IIDA RYO (JP)
YOSHINO YUSUKE (JP)
IIDA RYO (JP)
Application Number:
PCT/JP2023/005830
Publication Date:
February 01, 2024
Filing Date:
February 17, 2023
Export Citation:
Assignee:
MITSUBISHI HEAVY IND LTD (JP)
International Classes:
H03K17/082; H02H3/093; H02J1/00; H03K17/08
Foreign References:
| CN113659827A | 2021-11-16 | |||
| JP2020136875A | 2020-08-31 | |||
| JP2021103849A | 2021-07-15 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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