Semiconductor switch
First Claim
Patent Images
1. A semiconductor switch, comprising:
- a switching element;
a control device for outputting a control signal to the switching element;
an IC for supplying a control voltage to the control device;
a power source for supplying a supply voltage to the switching element and the IC;
wherein the control device is supplied with the control voltage within a predetermined range from the IC so that the control device outputs the control signal,wherein the switching element is turned on or off based upon the control signal from the control device,wherein the switching element includes a feed voltage-monitoring circuit for monitoring whether the control voltage fed from the IC to the control device is within the predetermined range,wherein the switching element further includes a driving circuit,wherein the driving circuit controls the switching element to be turned off when it is judged by the feed voltage-monitoring circuit that the control voltage is not within the predetermined range, andwherein the feed voltage monitoring circuit and the driving circuit are independently disposed from the IC.
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Abstract
A semiconductor switch interrupts output when a microcomputer or an external IC operates abnormally is connected to a control device such, and is turned on or off depending upon a control signal from the control device. The semiconductor switch has feed voltage-monitoring means for monitoring whether the voltage fed to the control device lies within a predetermined range, and is turned off when it is so judged that the voltage is not within the predetermined range.
16 Citations
12 Claims
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1. A semiconductor switch, comprising:
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a switching element; a control device for outputting a control signal to the switching element; an IC for supplying a control voltage to the control device; a power source for supplying a supply voltage to the switching element and the IC; wherein the control device is supplied with the control voltage within a predetermined range from the IC so that the control device outputs the control signal, wherein the switching element is turned on or off based upon the control signal from the control device, wherein the switching element includes a feed voltage-monitoring circuit for monitoring whether the control voltage fed from the IC to the control device is within the predetermined range, wherein the switching element further includes a driving circuit, wherein the driving circuit controls the switching element to be turned off when it is judged by the feed voltage-monitoring circuit that the control voltage is not within the predetermined range, and wherein the feed voltage monitoring circuit and the driving circuit are independently disposed from the IC. - View Dependent Claims (3, 5, 7, 9, 10)
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2. A semiconductor switch comprising:
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a switching element; a control device for outputting a control signal to the switching element; an IC for supplying a control voltage to the control device; a power source for supplying a supply voltage to the switching element and the IC; wherein the control device is supplied with the control voltage from the IC so that the control device outputs the control signal having a voltage within a predetermined range, wherein the switching element is turned on or off depending upon the control signal from the control device, wherein the switching element includes an output voltage-monitoring circuit for monitoring whether the voltage of the control signal output to the switching element from the control device is within the predetermined range, wherein the switching element further includes a driving circuit, wherein the driving circuit controls the switching element to be turned off when it is judged by the output voltage-monitoring circuit that the voltage of the control signal is not within the predetermined range, and wherein the output voltage-monitoring circuit and the driving circuit are independently disposed from the IC. - View Dependent Claims (4, 6, 8, 11, 12)
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Specification