Driving circuit
First Claim
Patent Images
1. A driving circuit comprising:
- a level shift circuit configured to convert an input signal from a preceding-stage circuit into a signal having a higher voltage than the input signal; and
a controller configured to output a signal to allow a first switch element to perform a soft shutdown based on an output signal from the level shift circuit, whereinthe driving circuit is configured to drive the first switch element,the preceding-stage circuit includes an abnormality detecting circuit,the controller determines whether the first switch element is to perform the soft shutdown based on an output signal from the abnormality detecting circuit,the first switch element is switched on or off according to a control signal input thereinto,the driving circuit further comprises a latch circuit configured to generate the control signal according to a set signal and a reset signal that are input from the preceding-stage circuit to the level shift circuit, andthe controller determines whether the first switch element is to perform the soft shutdown based on an output from the latch circuit and a state signal generated based on the output signal from the abnormality detecting circuit.
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Abstract
Voltage surge is prevented when the output from a driver of a driving circuit performs a hard shutdown. In this manner, the elements in the driving circuit are prevented from being damaged by the voltage surge. A driving circuit includes a level shift circuit configured to convert an input signal from a preceding-stage circuit into an output signal having a higher voltage than the input signal, and a controller configured to determine whether a switch element is to perform a soft shutdown based on a state signal indicating a state of the preceding-stage circuit. Here, the driving circuit is configured to drive the switch element.
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Citations
10 Claims
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1. A driving circuit comprising:
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a level shift circuit configured to convert an input signal from a preceding-stage circuit into a signal having a higher voltage than the input signal; and a controller configured to output a signal to allow a first switch element to perform a soft shutdown based on an output signal from the level shift circuit, wherein the driving circuit is configured to drive the first switch element, the preceding-stage circuit includes an abnormality detecting circuit, the controller determines whether the first switch element is to perform the soft shutdown based on an output signal from the abnormality detecting circuit, the first switch element is switched on or off according to a control signal input thereinto, the driving circuit further comprises a latch circuit configured to generate the control signal according to a set signal and a reset signal that are input from the preceding-stage circuit to the level shift circuit, and the controller determines whether the first switch element is to perform the soft shutdown based on an output from the latch circuit and a state signal generated based on the output signal from the abnormality detecting circuit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A driving circuit comprising:
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a level shift circuit configured to convert an input signal from a preceding-stage circuit into a signal having a higher voltage than the input signal; and a controller configured to output a signal to allow a first switch element to perform a soft shutdown based on an output signal from the level shift circuit, wherein the driving circuit is configured to drive the first switch element, the preceding-stage circuit includes an abnormality detecting circuit, the controller determines whether the first switch element is to perform the soft shutdown based on an output signal from the abnormality detecting circuit, and the preceding-stage circuit determines whether the first switch element is to perform the soft shutdown based on a signal input from outside and designed to control the first switch element and the output signal from the abnormality detecting circuit. - View Dependent Claims (8)
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9. A driving circuit comprising:
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a level shift circuit configured to convert an input signal from a preceding-stage circuit into a signal having a higher voltage than the input signal; and a controller configured to output a signal to allow a first switch element to perform a soft shutdown based on an output signal from the level shift circuit, wherein the driving circuit is configured to drive the first switch element, the controller controls the first switch element to start a hard shutdown after a predetermined period of time has elapsed after the first switch element starts the soft shutdown, and the controller determines the predetermined period of time depending on a type of an abnormality detected in the preceding-stage circuit.
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10. A driving circuit comprising:
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a level shift circuit configured to convert an input signal from a preceding-stage circuit into a signal having a higher voltage than the input signal; and a controller configured to output a signal to allow a first switch element to perform a soft shutdown based on an output signal from the level shift circuit, wherein the driving circuit is configured to drive the first switch element, the controller controls the first switch element to start a hard shutdown after a predetermined period of time has elapsed after the first switch element starts the soft shutdown, and the controller determines a time constant of the soft shutdown depending on a type of an abnormality detected in the preceding-stage circuit.
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Specification