TW202301768A - Current sense short protection circuit - Google Patents

Abstract

A current sense short protection circuit includes a switch unit, a current sensing unit, a detection circuit and a short detection module. The switch unit has a first terminal, a second terminal and a control terminal. The first terminal of the switch unit receives a first voltage. The control terminal of the switch unit receives a control signal. The current sensing unit has a first terminal and a second terminal. The first terminal of the current sensing unit is coupled to the second terminal of the switch unit. The second terminal of the current sensing unit receives a second voltage. The detection unit is coupled to the first terminal and the second terminal of the current sensing circuit, receives the second voltage and a third voltage provided by the first terminal of the current sensing unit, and generates a detection signal according to the second voltage and the third voltage. The short detection module is coupled to the first terminal of the switch unit, the second terminal of the current sensing terminal and the detection unit, receives the first voltage, the second voltage and the detection signal, and generates a short detection signal according to the first voltage, the second voltage and the detection signal.

Description

Current detection short circuit protection circuit

An embodiment of the present invention relates to a current detection protection device combined with a current detection short circuit protection circuit.

In recent years, more and more electronic devices use USB Type-C ports for data transmission and power supply. In addition to a single transmission interface, the USB Type C port also supports two-way plugging, so it can prevent the wrong direction of plugging, and can also provide high-current charging, and is also suitable for output of video screens.

Since high current output has become a future trend, the current detection path of the bus power pin of the USB Type C port is relatively important. If the current flowing through the bus power pin is too large, it may damage the switching circuit and its connected components. Serious damage, in addition to electrostatic discharge (ESD) protection, the USB Type C port needs to have an over-current protection device to detect over-current. Therefore, the overcurrent protection device is a very important component. However, in the field of electronic applications, the overcurrent protection device may have a short circuit state, causing excessive current to damage electronic components. If there is a detection circuit that can detect and protect this state at any time, it will make the overcurrent protection device safer and more reliable. .

An embodiment of the present invention provides a current detection short circuit protection circuit, which can effectively detect whether the current detection element is short-circuited, so as to increase the safety in use.

An embodiment of the present invention provides a current detection short circuit protection circuit, including a switch unit, a current sensing unit, a detection unit and a short circuit detection module. The switch unit has a first terminal, a second terminal and a control terminal. The first terminal of the switch unit receives the first voltage, and the control terminal of the switch unit receives the control signal. The current sensing unit has a first terminal and a second terminal. The first end of the current sensing unit is coupled to the second end of the switch unit. The second terminal of the current sensing unit receives the second voltage. The detection unit is coupled to the first end of the current sensing unit and the second end of the current sensing unit, receives the second voltage and the third voltage provided by the first end of the current sensing unit, and according to the second voltage and the third voltage to generate a detection signal. The short circuit detection module is coupled to the first end of the switch unit, the second end of the current sensing unit and the detection unit. The short-circuit detection module receives the first voltage, the second voltage and the detection signal, and generates a short-circuit detection signal according to the first voltage, the second voltage and the detection signal.

The current detection short circuit protection circuit disclosed in the embodiment of the present invention detects and generates a detection signal according to the second voltage at the second terminal of the current sensing unit and the third voltage at the third terminal of the current sensing unit through the detection unit . The short circuit detection module receives the first voltage of the first terminal of the switch unit, the second voltage of the second terminal of the current sensing unit and the detection signal of the detection unit, and according to the first voltage, the second voltage and the detection signal , to generate a short circuit detection signal. In this way, it can effectively detect whether the current sensing unit is short-circuited or abnormal, so as to increase the safety in use.

In the various embodiments listed below, the same or similar elements or components will be denoted by the same reference numerals.

FIG. 1 is a schematic diagram of a current detection short circuit protection circuit according to an embodiment of the present invention. Please refer to FIG. 1 , the current detection short circuit protection circuit 100 includes a switch unit 110 , a current sensing unit 120 , a detection unit 130 and a short circuit detection module 140 .

The switch unit 110 has a first terminal 111 , a second terminal 112 and a control terminal 113 . The first terminal 111 of the switch unit 110 can receive the first voltage V1. The control terminal 113 of the switch unit 110 can receive the control signal CS, and the switch unit 110 can be turned on or off according to the signal level of the control signal CS. In this embodiment, the switch unit 110 may be a transistor, such as a metal oxide semiconductor field effect transistor (MOSFET) or a bipolar transistor (bipolar transistor), but the embodiment of the present invention does not limited to this. In some implementation examples, the switch unit 110 may also be formed by connecting two transistors.

The current sensing unit 120 has a first terminal 121 and a second terminal 122 . The first terminal 121 of the current sensing unit 120 is coupled to the second terminal 112 of the switch unit 110 . The second terminal 122 of the current sensing unit 120 receives the second voltage V2.

In some embodiments, the first voltage V1 is, for example, the system voltage of the system circuit (such as VIN), and the second voltage V2 is, for example, the bus voltage of the transmission port (such as VBUS). In addition, the current sensing unit 120 is usually a precision resistor for sensing the current from the first voltage V1 to the second voltage V2. But the embodiments of the present invention are not limited thereto. In some embodiments, the first voltage V1 is, for example, a bus voltage (such as VBUS) of a transmission port (such as a bus power pin), and the second voltage V2 is, for example, a system voltage (such as VIN) of a system circuit. In addition, the current sensing unit 120 can be used to sense the current from the second voltage V2 to the first voltage V1.

The detection unit 130 is coupled to the first end 121 of the current sensing unit 120 and the second end 122 of the current sensing unit 120 . The detection unit 130 receives the second voltage V2 and the third voltage V3 provided by the first terminal 121 of the current sensing unit 120, and generates a detection signal DS according to a voltage difference signal generated by the second voltage V2 and the third voltage V3. .

The short circuit detection module 140 is coupled to the first terminal 111 of the switch unit 110 , the second terminal 122 of the current sensing unit 120 and the detection unit 130 . The short circuit detection module 140 receives the first voltage V1, the second voltage V2 and the detection signal DS generated by the detection unit 130, and generates a voltage difference signal according to the first voltage V1 and the second voltage V2, and cooperates with the detection The detection signal DS generated by the unit 130 is used to generate the short detection signal SDS.

Further, the short circuit detection module 140 may include a comparison circuit 141 . The comparison circuit 141 can determine whether to start the operation of comparing the first voltage V1 and the second voltage V2 according to the signal state of the detection signal DS, so as to generate the short detection signal SDS. For example, when the voltage difference between the second voltage V2 and the third voltage V3 in the detection signal DS is a preset voltage difference or higher than the preset voltage difference, the comparison circuit 141 will not start to compare the first voltage V1 An operation of comparing with the second voltage V2. When the voltage difference between the second voltage V2 and the third voltage V3 in the detection signal DS is lower than the preset voltage difference, it indicates that the current sensing unit 120 may be short-circuited or abnormal, and the comparison circuit 141 will An operation of comparing the first voltage V1 with the second voltage V2 is initiated.

For example, the comparison circuit 141 can compare the first voltage V1 and the second voltage V2 to calculate the voltage difference between the first voltage V1 and the second voltage V2 (for example |V1−V2|), and confirm the above Whether the voltage difference is a preset voltage difference, so as to generate the short circuit detection signal SDS. In this embodiment example, the above-mentioned preset voltage difference is, for example, the sum of the voltage difference corresponding to the switch unit 110 and the voltage difference of the current sensing unit 120, together with the detection signal DS generated by the detection unit 130, but the embodiment of the present invention Not limited to this. Users can adjust the value of the preset voltage difference according to their needs, and the same effect can be achieved.

When the comparison circuit 141 confirms that the voltage difference is lower than the preset voltage difference, and indicates that the detection signal DS generated by the detection unit 130 is at a low logic level, indicating that the current sensing unit 120 is not short-circuited or normal, the comparison circuit 141 For example, a short circuit detection signal SDS of a low logic level is generated to the system circuit, so that the system circuit can know that the current sensing unit 120 does not have a short circuit phenomenon.

When the comparison circuit 141 confirms that the voltage difference is equal to or higher than the preset voltage difference, and the detection signal DS generated by the detection unit 130 is at a high logic level, it indicates that the current sensing unit 120 is short-circuited or abnormal, and the comparison circuit 141, for example, generates a short-circuit detection signal SDS of a high logic level to the system circuit, so that the system circuit can know that the current sensing unit 120 has a short circuit, and can send an alarm signal to inform the user that the current sensing unit 120 has a short circuit , and then perform operations such as subsequent replacement or maintenance on the current sensing unit 120 . Therefore, it can effectively detect whether the current sensing unit 120 (circuit element) is short-circuited or abnormal, so as to increase the safety in use.

FIG. 2 is a schematic diagram of a current detection short circuit protection circuit according to another embodiment of the present invention. Please refer to FIG. 2 , the current detection short circuit protection circuit 200 includes a switch unit 110 , a current sensing unit 120 , a detection unit 130 and a short circuit detection module 240 . In this embodiment, the switch unit 110, the current sensing unit 120, and the detection unit 130 are the same as or similar to the switch unit 110, the current sensing unit 120, and the detection unit 130 in FIG. 1 . Refer to FIG. 1 for implementation. example, so it will not be repeated here.

The short circuit detection module 240 is coupled to the first terminal 111 of the switch unit 110 and the second terminal 122 of the current sensing unit 120 . The short circuit detection module 240 receives the first voltage V1 and the second voltage V2, and according to the voltage difference signal generated by the first voltage V1 and the second voltage V2, and cooperates with the detection signal DS generated by the detection unit 130, to Generate a short detection signal SDS.

Further, the short-circuit detection module 240 may include an analog-to-digital conversion circuit 241 . The analog-to-digital conversion circuit 241 can determine whether to start the operation of converting and comparing the first voltage V1 and the second voltage V2 according to the signal state of the detection signal DS, so as to generate the short detection signal SDS. For example, when the voltage difference between the second voltage V2 and the third voltage V3 in the detection signal DS is a preset voltage difference or higher than the preset voltage difference, the analog-to-digital conversion circuit 241 will not activate the first The voltage V1 is converted and compared with the second voltage V2. When the voltage difference between the second voltage V2 and the third voltage V3 in the detection signal DS is lower than the preset voltage difference, it indicates that the current sensing unit 120 may be short-circuited or abnormal, and the analog-to-digital conversion circuit 241 starts the operation of converting and comparing the first voltage V1 and the second voltage V2. Further, the analog-to-digital conversion circuit 241 can perform analog-to-digital conversion on the first voltage V1 and the second voltage V2 according to the detection signal DS, and compare the ratio of the voltage difference between the first voltage V1 and the second voltage V2 to generate Short circuit detection signal SDS.

For example, when the voltage difference between the second voltage V2 and the third voltage V3 in the detection signal DS is lower than a preset voltage difference, the analog-to-digital conversion circuit 241 can perform a conversion on the first voltage V1 and the second voltage V2. Analog to digital conversion, to convert the first voltage V1 and the second voltage V2 into voltage ratios and calculate the voltage difference ratio between the first voltage V1 and the second voltage V2, and confirm whether the voltage difference ratio is the preset voltage The difference ratio is used to generate the short circuit detection signal SDS.

When the analog-to-digital conversion circuit 241 confirms that the voltage difference ratio is lower than the preset voltage difference ratio, and the detection signal DS generated by the detection unit 130 is at a low logic level, it means that the current sensing unit 120 is not short-circuited or normal. For example, the analog-to-digital conversion circuit 241 generates a short-circuit detection signal SDS of a low logic level to the system circuit, so that the system circuit can know that the current sensing unit 120 is not short-circuited.

When the analog-to-digital conversion circuit 241 confirms that the voltage difference ratio is equal to or higher than the preset voltage difference ratio, and the detection signal DS generated by the detection unit 130 is at a high logic level, it indicates that the current sensing unit 120 is short-circuited or not. Normally, the analog-to-digital conversion circuit 241, for example, generates a short-circuit detection signal SDS of a high logic level to the system circuit, so that the system circuit can know that the current sensing unit 120 has a short-circuit phenomenon, and can issue an alarm signal to inform the user of the current The sensing unit 120 is short-circuited, and operations such as subsequent replacement or maintenance of the current sensing unit 120 are performed. Therefore, it can effectively detect whether the current sensing unit 120 (circuit element) is short-circuited or abnormal, so as to increase the safety in use.

FIG. 3 is a schematic diagram of a current detection short circuit protection circuit according to another embodiment of the present invention. Please refer to FIG. 3 , the current detection short circuit protection circuit 300 includes a switch unit 110 , a current sensing unit 120 , a detection unit 130 and a short circuit detection module 140 . In this embodiment, the switch unit 110, the current sensing unit 120, the detection unit 130 and the short circuit detection module 140 are the same as the switch unit 110, the current sensing unit 120, the detection unit 130 and the short circuit detection module in FIG. 1 The modules 140 are the same or similar, and reference can be made to the description of the embodiment in FIG. 1 , so details are not repeated here.

In this embodiment, the short circuit detection module 140 (comparison circuit 141) receives the first voltage V1, the second voltage V2 and the detection signal DS, and the short circuit detection module 140 (comparison circuit 141) is further coupled to the current sense The first end 121 of the measuring unit 120 is connected to receive the third voltage V3. Moreover, the short circuit detection module 140 (comparison circuit 141 ) can generate the short circuit detection signal SDS according to the first voltage V1 , the second voltage V2 , the third voltage V3 and the detection signal DS. Further, the short circuit detection module 140 (comparison circuit 141) can determine whether to start the operation of comparing the first voltage V1, the second voltage V2 and the third voltage V3 according to the signal state of the detection signal DS to generate a short circuit. Detection signal SDS.

For example, when the voltage difference between the second voltage V2 and the third voltage V3 in the detection signal DS is a preset voltage difference or higher than the preset voltage difference, the short circuit detection module 140 (comparison circuit 141) The operation of comparing the first voltage V1 , the second voltage V2 and the third voltage V3 will not be started. When the voltage difference between the second voltage V2 and the third voltage V3 in the detection signal DS is lower than the preset voltage difference, it indicates that the current sensing unit 120 may be short-circuited or abnormal, and the short-circuit detection mode The group 140 (comparison circuit 141 ) starts the operation of comparing the first voltage V1 , the second voltage V2 and the third voltage V3 . Further, the short circuit detection module 140 (comparison circuit 141) can compare the first voltage difference between the first voltage V1 and the second voltage V2 and the second voltage difference between the second voltage V2 and the third voltage V3 , to generate a short detection signal SDS.

For example, the short circuit detection module 140 (comparison circuit 141) can compare the first voltage V1 and the second voltage V2 and the second voltage V2 and the third voltage V3 to calculate the first voltage V1 and the second voltage The first voltage difference (for example |V1-V2|) between V2 and the second voltage difference (for example |V2-V3|) between the second voltage V2 and the third voltage V3, and confirm that the above-mentioned first voltage difference is consistent with the above-mentioned first voltage difference Whether the two voltage differences are preset voltage differences, so as to generate the short circuit detection signal SDS.

When the short-circuit detection module 140 (comparison circuit 141) confirms that the first voltage difference and the second voltage difference are preset voltage differences, and the detection signal DS generated by the detection unit 130 is at a low logic level, indicating the current The sensing unit 120 is not short-circuited or is normal. The short-circuit detection module 140 (comparison circuit 141) for example generates a short-circuit detection signal SDS of a low logic level to the system circuit, so that the system circuit can know that the current sensing unit 120 has not occurred. Short circuit phenomenon.

When the short-circuit detection module 140 (comparison circuit 141) confirms that the first voltage difference and the second voltage difference are equal to or higher than the preset voltage difference, and the detection signal DS generated by the detection unit 130 is a high logic level , indicating that the current sensing unit 120 is short-circuited or abnormal. The short-circuit detection module 140 (comparison circuit 141) for example generates a short-circuit detection signal SDS of a high logic level to the system circuit, so that the system circuit can know the current sensing unit 120 has a short circuit phenomenon, and an alarm signal can be sent to inform the user that the current sensing unit 120 has a short circuit, so as to perform operations such as subsequent replacement or maintenance on the current sensing unit 120 . Therefore, it can effectively detect whether the current sensing unit 120 (circuit element) is short-circuited or abnormal, so as to increase the safety in use.

FIG. 4 is a schematic diagram of a current detection short circuit protection circuit according to another embodiment of the present invention. Please refer to FIG. 4 , the current detection short circuit protection circuit 400 includes a switch unit 110 , a current sensing unit 120 , a detection unit 130 and a short circuit detection module 240 . In this embodiment, the switch unit 110, the current sensing unit 120, the detection unit 130 and the short circuit detection module 240 are the same as the switch unit 110, the current sensing unit 120, the detection unit 130 and the short circuit detection module in FIG. 2 The modules 240 are the same or similar, and reference can be made to the description of the embodiment in FIG. 2 , so details are not repeated here.

In this embodiment, the short circuit detection module 240 (analog to digital conversion circuit 241) receives the first voltage V1, the second voltage V2 and the detection signal DS, and the short circuit detection module 240 (analog to digital conversion circuit 241) further The first end 121 of the current sensing unit 120 is coupled to receive the third voltage V3. Moreover, the short-circuit detection module 240 (analog-to-digital conversion circuit 241 ) can generate the short-circuit detection signal SDS according to the first voltage V1 , the second voltage V2 , the third voltage V3 and the detection signal DS. Furthermore, the short-circuit detection module 240 (analog-to-digital conversion circuit 241) can determine whether to start converting and comparing the first voltage V1, the second voltage V2 and the third voltage V3 according to the signal state of the detection signal DS. operation to generate the short detection signal SDS.

For example, when the voltage difference between the second voltage V2 and the third voltage V3 in the detection signal DS is a preset voltage difference or higher than the preset voltage difference, the short circuit detection module 240 (analog-to-digital conversion circuit 241) The operation of converting and comparing the first voltage V1, the second voltage V2 and the third voltage V3 will not be started. When the voltage difference between the second voltage V2 and the third voltage V3 in the detection signal DS is lower than the preset voltage difference, it indicates that the current sensing unit 120 may be short-circuited or abnormal, and the short-circuit detection mode The group 240 (analog-to-digital conversion circuit 241 ) starts the operation of converting and comparing the first voltage V1 , the second voltage V2 and the third voltage V3 . Further, the short-circuit detection module 240 (analog-to-digital conversion circuit 241) can perform analog-to-digital conversion on the first voltage V1, the second voltage V2, and the third voltage V3 according to the detection signal DS, and compare the first voltage V1 and the third voltage V3. The first voltage difference ratio between the second voltage V2 and the second voltage difference ratio between the second voltage V2 and the third voltage V3 are used to generate the short detection signal SDS.

For example, when the voltage difference between the second voltage V2 and the third voltage V3 in the detection signal DS is lower than a preset voltage difference, the short circuit detection module 240 (analog to digital conversion circuit 241) can detect the first The voltage V1, the second voltage V2 and the third voltage V3 are analog-to-digital converted to convert the first voltage V1, the second voltage V2 and the third voltage V3 into voltage ratios respectively and calculate the first voltage V1 and the second voltage V2 The first voltage difference ratio between and the second voltage difference ratio between the second voltage V2 and the third voltage V3, and confirm whether the difference between the first voltage difference ratio and the second voltage ratio is a preset voltage difference ratio, to generate a short detection signal SDS.

When the short-circuit detection module 240 (analog-to-digital conversion circuit 241) confirms that the first voltage difference ratio and the second voltage ratio difference are preset voltage difference ratios, and the detection signal DS generated by the detection unit 130 is low The logic level indicates that the current sensing unit 120 is not short-circuited or normal. The short-circuit detection module 240 (analog-to-digital conversion circuit 241), for example, generates a short-circuit detection signal SDS of a low logic level to the system circuit, so that the system circuit can be obtained. It is known that the current sensing unit 120 is not short-circuited.

When the short circuit detection module 240 (analog to digital conversion circuit 241) confirms that the first voltage difference ratio and the second voltage difference ratio are equal to or higher than the preset voltage difference ratio, and the detection signal DS generated by the detection unit 130 It is a high logic level, indicating that the current sensing unit 120 is short-circuited or abnormal, and the short-circuit detection module 240 (analog-to-digital conversion circuit 241), for example, generates a short-circuit detection signal SDS of a high logic level to the system circuit, so that the system circuit It can be known that the current sensing unit 120 has a short circuit, and an alarm signal can be sent to inform the user of the short circuit of the current sensing unit 120 , and then perform operations such as subsequent replacement or maintenance on the current sensing unit 120 . Therefore, it can effectively detect whether the current sensing unit 120 (circuit element) is short-circuited or abnormal, so as to increase the safety in use.

To sum up, the current detection short circuit protection circuit disclosed by the embodiment of the present invention detects and relies on the second voltage at the second end of the current sensing unit and the third voltage at the third end of the current sensing unit through the detection unit The short-circuit detection module receives the first voltage of the first end of the switch unit, the second voltage of the second end of the current sensing unit and the detection signal of the detection unit, and according to the first voltage, the second Voltage and detection signal to generate short circuit detection signal. In addition, the short circuit detection module of the embodiment of the present invention can also receive a third voltage, and the short circuit detection module can generate a short circuit detection signal according to the first voltage, the second voltage, the third voltage and the detection signal . Therefore, it is possible to effectively detect whether the current sensing unit (circuit element) is short-circuited or abnormal, and to detect over-current, so as to increase the safety in use.

Although the present invention has been disclosed above with the embodiments, it is not intended to limit the scope of the present invention. Anyone with ordinary knowledge in the technical field may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the scope of the appended patent application.

100,200,300,400: current detection short circuit protection circuit 110: switch unit 111,121: first end 112,122: second end 113: Control terminal 120: current sensing unit 130: Detection unit 140,240: Short circuit detection module 141: Comparison circuit 241: Analog to digital conversion circuit V1: first voltage V2: second voltage V3: the third voltage SDS: Short circuit detection signal DS: detection signal CS: control signal

FIG. 1 is a schematic diagram of a current detection short circuit protection circuit according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a current detection short circuit protection circuit according to another embodiment of the present invention. FIG. 3 is a schematic diagram of a current detection short circuit protection circuit according to another embodiment of the present invention. FIG. 4 is a schematic diagram of a current detection short circuit protection circuit according to another embodiment of the present invention.

100: Current detection short circuit protection circuit

110: switch unit

111,121: first end

112,122: second end

113: Control terminal

120: current sensing unit

130: Detection unit

140: Short circuit detection module

141: Comparison circuit

V1: first voltage

V2: second voltage

V3: the third voltage

SDS: Short circuit detection signal

DS: detection signal

CS: control signal

Claims (8)

A current detection short circuit protection circuit, comprising: A switch unit has a first terminal, a second terminal and a control terminal, the first terminal of the switch unit receives a first voltage, and the control terminal of the switch unit receives a control signal; A current sensing unit has a first end and a second end, the first end of the current sensing unit is coupled to the second end of the switch unit, the second end of the current sensing unit receives a second voltage; A detection unit, coupled to the first end of the current sensing unit and the second end of the current sensing unit, receives the second voltage and a third voltage provided by the first end of the current sensing unit voltage, and generate a detection signal according to the second voltage and the third voltage; and a short-circuit detection module, coupled to the first terminal of the switch unit, the second terminal of the current sensing unit and the detection unit, receives the first voltage and the second voltage and the detection signal, and A short circuit detection signal is generated according to the first voltage, the second voltage and the detection signal. The current detection short-circuit protection circuit as described in claim 1, wherein the short-circuit detection module is further coupled to the first end of the current sensing unit and the second end of the current sensing unit, and the short-circuit detection The module further receives the third voltage, and the short circuit detection module generates the short circuit detection signal according to the first voltage, the second voltage, the third voltage and the detection signal. The current detection short circuit protection circuit as described in claim 2, wherein the short circuit detection module includes a comparison circuit, and the comparison circuit compares a first voltage between the first voltage and the second voltage according to the detection signal A voltage difference and a second voltage difference between the second voltage and the third voltage to generate the short circuit detection signal. The current detection short-circuit protection circuit as described in claim 2, wherein the short-circuit detection module includes an analog-to-digital conversion circuit, and the analog-to-digital conversion circuit combines the first voltage, the second voltage and the The third voltage is analog-to-digital converted, and a first voltage difference ratio between the first voltage and the second voltage is compared with a second voltage difference ratio between the second voltage and the third voltage to obtain The short circuit detection signal is generated. The current detection short circuit protection circuit as described in claim 1, wherein the short circuit detection module includes a comparison circuit, and the comparison circuit compares a voltage between the first voltage and the second voltage according to the detection signal difference to generate the short circuit detection signal. The current detection short-circuit protection circuit as described in Claim 1, wherein the short-circuit detection module includes an analog-to-digital conversion circuit, and the analog-to-digital conversion circuit performs a comparison between the first voltage and the second voltage according to the detection signal An analog-to-digital conversion is performed, and a voltage difference ratio between the first voltage and the second voltage is compared to generate the short-circuit detection signal. The current detection short circuit protection circuit according to claim 1, wherein the first voltage is a system voltage, and the second voltage is a bus voltage. The current detection short circuit protection circuit according to claim 1, wherein the first voltage is a bus voltage, and the second voltage is a system voltage.

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