TWI813055B - Short circuit protection circuit, electronic device and operation method thereof - Google Patents

Abstract

A short circuit protection circuit includes a pre-charging circuit, a detecting circuit, a control circuit, and a main-power switch circuit. The pre-charging circuit receives an input voltage to output a pre-charging current to a load. The detecting circuit receives a load voltage of the load to generate a detecting signal. The control circuit is coupled to the detecting circuit, receives the input voltage and the detecting signal, and generates a control signal according to the input voltage and the detecting signal. The main-power switch circuit is coupled to the control circuit, receives the input voltage and the control signal, and determines whether to output the input voltage to the load according to the control signal.

Description

Short circuit protection circuit, electronic device and operating method thereof

The present invention relates to a protection circuit, and in particular to a short-circuit protection circuit, an electronic device and an operating method thereof.

Generally speaking, some electronic devices are designed with a power supply and multiple loads, and the power supply can provide system voltage to the loads so that the loads can operate normally.

However, when one of the above loads is damaged or abnormal, the above loads will affect the operation of the power supply. For example, a damaged or abnormal load will pull down the system voltage provided by the power supply, causing the power supply and other loads that are not damaged or abnormal to operate normally. Therefore, how to prevent abnormal loads from affecting the operation of the power supply is an important issue at present.

The present invention provides a short-circuit protection circuit, an electronic device and an operating method thereof to prevent abnormal loads from affecting the operation of the power supply device, thereby achieving protection effects and increasing convenience of use.

The invention provides a short-circuit protection circuit, which includes a precharge circuit, a detection circuit, a control circuit and a main power switch circuit. The precharge circuit receives the input voltage to output the precharge current to the load. The detection circuit receives the load voltage of the load to generate a detection signal. The control circuit is coupled to the detection circuit, receives the input voltage and the detection signal, and generates the control signal according to the input voltage and the detection signal. The main power switch circuit is coupled to the control circuit, receives the input voltage and the control signal, and determines whether to output the input voltage to the load based on the control signal.

The invention provides an electronic device, which includes a power supply device, a plurality of short-circuit protection circuits and a plurality of loads. The power supply unit generates the input voltage. The short circuit protection circuit is coupled to the power supply device. Each load is coupled to each short circuit protection circuit. Each short-circuit protection circuit detects the status of each load. When each short-circuit protection circuit detects that the status of each load is normal, each short-circuit protection circuit outputs an input voltage to each load, and when the short-circuit protection circuit When one of them detects that the status of the load is abnormal, the short-circuit protection circuit does not output the input voltage to the load coupled to the short-circuit protection circuit.

The invention provides an operating method for an electronic device, which includes the following steps. A power supply device is provided to generate the input voltage. Provide multiple short-circuit protection circuits coupled to the power supply device. Multiple loads are provided, and each load is coupled to each short-circuit protection circuit. The status of each load is detected through each short-circuit protection circuit; when each short-circuit protection circuit detects that the status of each load is normal, each short-circuit protection circuit outputs an input voltage to each load. When one of the short-circuit protection circuits detects that the state of the load is abnormal, the short-circuit protection circuit does not output the input voltage to the load coupled to the short-circuit protection circuit.

The short-circuit protection circuit, electronic device and operating method disclosed by the present invention receive an input voltage through the precharge circuit to output a precharge current to the load, the detection circuit receives the load voltage of the load to generate a detection signal, and the control circuit controls the input voltage according to the input voltage. and the detection signal to generate a control signal, and the main power switch circuit determines whether to output the input voltage to the load based on the control signal. In this way, it is possible to effectively prevent abnormal loads from affecting the operation of the power supply device or the operation of the power supply device and other loads that do not cause abnormality, thereby achieving a protective effect and increasing convenience of use.

It must be understood that the words "including" and "including" used in this specification are used to indicate the existence of specific technical features, numerical values, method steps, work processes, components and/or components, but do not exclude the possibility of Plus further technical features, values, method steps, processes, components, assemblies, or any combination of the above.

Words such as "first" and "second" are used to modify components. They are not used to indicate the priority or precedence relationship between them, but are only used to distinguish components with the same name.

In each of the embodiments listed below, the same or similar elements or components will be represented by the same reference numerals.

Figure 1 is a schematic diagram of a short circuit protection circuit according to an embodiment of the present invention. Please refer to Figure 1. The short circuit protection circuit 100 includes a precharge circuit 110, a detection circuit 120, a control circuit 130 and a main power switch circuit 140.

The precharge circuit 110 is suitable for coupling the power supply device 150 and the load 160 . The precharge circuit 110 receives the input voltage VIN to generate the precharge current I1 to the load 160 . In this embodiment, the power supply device 150 is, for example, a power supply, and the input voltage VIN generated by the power supply device 150 is, for example, a voltage of 5V, but the embodiment of the present invention is not limited thereto. The power supply device 150 can generate input voltage VIN of different voltages according to actual needs.

The detection circuit 120 is adapted to be coupled to the load 160 . The detection circuit 120 receives the load voltage of the load 160 to generate the detection signal VB0. In some embodiments, the load voltage of load 160 may be a voltage generated by load 160 in response to the precharge current. That is to say, when the load 160 receives the precharge current I1 generated by the precharge circuit 110, the internal capacitor of the load 160 can be charged according to the precharge current I1 to generate a corresponding load voltage. In some embodiments, the load voltage of the load 160 may be the voltage of the load 160 under normal operation or the voltage of the load 160 when an abnormal phenomenon (such as a short circuit) occurs, but the invention is not limited thereto. At this time, the detection circuit 120 can detect the load voltage of the load 160 to generate the detection signal VB0. In this embodiment, the load 160 is, for example, a front end module (FEM) chip, but the invention is not limited thereto.

The control circuit 130 is coupled to the detection circuit 120 and is suitable for coupling to the power supply device 150 . The control circuit 130 receives the input voltage VIN and the detection signal VB0, and generates the control signal CS according to the detection signal VB0. In this embodiment, the control circuit 130 can determine the state of the load 160 according to the voltage value of the detection signal VB0 to generate a corresponding control signal. For example, when the voltage value of the detection signal VB0 is greater than or equal to a preset voltage value, the control circuit 130 can determine that the state of the load 160 is normal, and the control circuit 130 generates, for example, a high logic level control signal CS. When the voltage value of the detection signal VB0 is less than the above-mentioned preset voltage value, the control circuit 130 can determine that the state of the load 160 is abnormal (for example, the load 160 is short-circuited), and the control circuit generates, for example, a low logic level control signal CS.

The main power switch circuit 140 is coupled to the control circuit 130 and is adapted to be coupled to the power supply device 150 . The main power switch circuit 140 receives the input voltage VIN and the control signal CS, and determines whether to output the input voltage VIN to the load 160 according to the control signal CS. For example, when the control signal CS is at a high logic level (indicating that the status of the load 160 is normal), the main power switch circuit 140 can output the input voltage VIN to the load 160 so that the load 160 can operate normally. When the control signal CS is at a low logic level (indicating that the status of the load 160 is abnormal), the main power switch circuit 140 does not output the input voltage VIN to the load 160 , that is, the main power switch circuit 140 can disconnect the power supply device 150 and the load 160 connection between. In this way, the abnormal load 160 can be effectively prevented from affecting the operation of the power supply device 150, thereby achieving a protection effect and increasing convenience of use.

Figure 2 is a circuit diagram of the short-circuit protection circuit in Figure 1. Please refer to picture 2. Precharge circuit 110 may include resistor R1. The resistor R1 has a first terminal and a second terminal. The first terminal of the resistor R1 receives the input voltage VIN, and the second terminal of the resistor R1 generates the precharge current I1. The precharge current I1 is, for example, determined by the input voltage VIN and the resistor R1, that is, I1=VIN/R1.

The detection circuit 120 may include a resistor R2 and a diode D1. The resistor R2 has a first terminal and a second terminal. The first end of the resistor R2 is adapted to be coupled to the load 160 to receive the load voltage. Diode D1 has a first terminal and a second terminal. The first terminal of the diode D1 is coupled to the second terminal of the resistor R1. The second terminal of diode D1 generates detection signal VB0. In this embodiment, the diode D1 is, for example, a Schottky diode, and the first end of the diode D1 is, for example, the cathode end of the Schottky diode. The second terminal of D1 is, for example, the anode terminal of a Schottky diode.

The control circuit 130 includes a resistor R3, an impedance circuit 210, a voltage detection circuit 220, a resistor R4, a resistor R5 and a capacitor C1. The resistor R3 has a first terminal and a second terminal. The first terminal of resistor R3 receives the input voltage VIN. The second terminal of the resistor R3 receives the detection signal VB0.

The impedance circuit 210 is coupled to the second end of the resistor R3. In this embodiment, the impedance circuit 210 includes a resistor R6 and a resistor R7. The resistor R6 has a first terminal and a second terminal. The first terminal of the resistor R6 is coupled to the second terminal of the resistor R3. Resistor R7 has a first terminal and a second terminal. The first terminal of the resistor R7 is coupled to the second terminal of the resistor R6. The second terminal of the resistor R7 is coupled to the ground terminal.

The voltage detection circuit 220 has a first terminal, a second terminal and a third terminal. The first terminal of the voltage detection circuit 220 is coupled to the impedance circuit 210 . In this embodiment, the first terminal of the voltage detection circuit 220 is coupled to the second terminal of the resistor R6, for example. The second terminal of the voltage detection circuit 220 is coupled to the ground terminal. The third terminal of the voltage detection circuit 220 generates a voltage detection signal. In this embodiment, the voltage detection circuit 220 may include a voltage comparator 221.

The resistor R4 has a first terminal and a second terminal. The first terminal of the resistor R4 is coupled to the third terminal of the voltage detection circuit 220 to receive the voltage detection signal. The second terminal of resistor R4 generates control signal CS. The resistor R5 has a first terminal and a second terminal. The first terminal of the resistor R5 is coupled to the second terminal of the resistor R4. The second terminal of resistor R5 receives the input voltage VIN. The capacitor C1 has a first terminal and a second terminal. The first terminal of the capacitor C1 is coupled to the first terminal of the resistor R5. The second terminal of the capacitor C1 is coupled to the second terminal of the resistor R5. That is to say, the capacitor C1 and the resistor R5 are coupled in parallel.

Main power switch circuit 140 includes transistor T1. The transistor T1 has a first terminal, a second terminal and a third terminal. The first terminal of the transistor T1 receives the control signal CS, the second terminal of the transistor T1 receives the input voltage VIN, and the third terminal of the transistor T1 outputs the input voltage VIN. In this embodiment, the transistor T1 may be a P-type transistor, such as a P-type metal oxide semiconductor field effect transistor (MOSFET), but the embodiment of the present invention is not limited thereto. The first terminal of the transistor T1 is, for example, the gate terminal of the P-type transistor, the second terminal of the transistor T1 is, for example, the drain terminal of the P-type transistor, and the third terminal of the transistor T1 is, for example, It is the source terminal of the P-type transistor. In some embodiments, the transistor T1 may also be a P-type bipolar junction transistor (BJT) or other suitable transistor.

During the overall operation of the short circuit protection circuit 100 , the short circuit protection circuit 100 is coupled to the power supply device 150 and the load 160 . The resistor R1 can receive the input voltage VIN generated by the power supply device 150 to generate the precharge current I1 to the load 160 . When the state of the load 160 is normal, the internal capacitance of the load 160 can be charged using the precharge current, and the load 160 can generate a load voltage. On the contrary, when the status of the load 160 is abnormal (for example, the load 160 is short-circuited), the load 160 will not generate a load voltage.

Then, the detection circuit 120 can detect the load voltage of the load 160 to generate the detection signal VB0. When the detection circuit 120 detects the load voltage (indicating that the status of the load 160 is normal), the detection circuit 120 may generate a detection signal VB0 corresponding to the load voltage. When the detection circuit 120 does not detect the load voltage (indicating that the state of the load 160 is abnormal), the detection circuit 120 generates, for example, a detection signal VB0 with a low voltage level.

Afterwards, the detection signal VB0 is output to the end point where the second end of the resistor R3 is coupled to the impedance circuit 210 (for example, the first end of the resistor R6). Then, the resistor R6 and the resistor R7 of the impedance circuit 210 may divide the detection signal VB0 to generate a divided voltage to the voltage comparator 221 of the voltage detection circuit 220 . Afterwards, the voltage comparator 221 of the voltage detection circuit 220 can compare the divided voltage with a preset voltage. When the voltage comparator 221 of the voltage detection circuit 220 confirms that the divided voltage is the same as the preset voltage (that is, the divided voltage reaches the preset voltage), the voltage comparator 221 of the voltage detection circuit 220 generates, for example, a low logic level voltage detection. signal.

In addition, when the voltage comparator 221 of the voltage detection circuit 220 confirms that the divided voltage is lower than the preset voltage and the divided voltage is a low logic level, the voltage comparator 221 of the voltage detection circuit 220 generates, for example, a high logic level voltage detection. signal. In some embodiments, when the voltage comparator 221 of the voltage detection circuit 220 confirms that the divided voltage is less than the preset voltage, it means that an undervoltage phenomenon occurs in the load 160, and the voltage comparator 221 of the voltage detection circuit 220 can generate, for example, a high logic level. bit voltage detection signal. In some embodiments, when the voltage comparator 221 of the voltage detection circuit 220 confirms that the divided voltage is greater than the preset voltage, it means that an overcurrent phenomenon occurs in the load 160, and the voltage comparator 221 of the voltage detection circuit 220 can generate, for example, a high logic level. bit voltage detection signal.

Afterwards, according to the voltage detection signal received by the first end of the resistor R4, the second end of the resistor R4 can generate a corresponding control signal CS. For example, when the voltage detection signal is at a low logic level, the control signal CS generated by the second end of the resistor R4 is at a low logic level, indicating that the state of the load 160 is normal. When the voltage detection signal is at a high logic level, the control signal CS generated by the second end of the resistor R4 is at a high logic level, indicating that the status of the load 160 is abnormal, such as a short circuit, undervoltage or overcurrent in the load 160 .

Then, when the first terminal (eg, the gate terminal) of the transistor T1 of the main power switching circuit 140 receives the low logic level control signal CS, the transistor T1 may be turned on, so that the third terminal (eg, the main power switch) of the transistor T1 The switch circuit 140) outputs the input voltage VIN to the load 160, so that the load 160 can operate normally. In addition, when the first terminal (for example, the gate terminal) of the transistor T1 of the main power switch circuit 140 receives the high logic level control signal CS, the transistor T1 does not conduct, and the third terminal of the transistor T1 (the main power switch The circuit 140) does not output the input voltage VIN to the load 160, that is, the main power switch circuit 140 can disconnect the power supply device 150 and the load 160. In this way, the abnormal load 160 can be effectively prevented from affecting the operation of the power supply device 150, thereby achieving a protection effect and increasing convenience of use.

Figure 3 is another circuit diagram of the short circuit protection circuit in Figure 1. The short-circuit protection circuit 100 of FIG. 3 is generally similar to the short-circuit protection circuit 100 of FIG. 2 . In this embodiment, the precharge circuit 110, the detection circuit 120, the main power switch circuit 140 and their internal components are the same as or similar to the precharge circuit 110, the detection circuit 120, the main power switch circuit 140 and their internal components in Figure 2 , please refer to the description of the embodiment in Figure 2, so no details will be given here.

The control circuit 130 includes a resistor R3, an impedance circuit 210, a voltage detection circuit 310, a resistor R4, a resistor R5 and a capacitor C1. In this embodiment, the resistor R3, the impedance circuit 210, the resistor R4, the resistor R5 and the capacitor C1 are the same as or similar to the resistor R3, the impedance circuit 210, the resistor R4, the resistor R5 and the capacitor C1 in Figure 2. Please refer to Figure 2 The description of the embodiment will not be repeated here. In addition, the impedance circuit 210 includes a resistor R6 and a resistor R7. Please refer to the description of the embodiment in FIG. 2, so the details are not repeated here.

The voltage detection circuit 310 has a first terminal, a second terminal and a third terminal. The first terminal of the voltage detection circuit 310 is coupled to the impedance circuit 210 . In this embodiment, the first terminal of the voltage detection circuit 310 is coupled to the second terminal of the resistor R6, for example. The second terminal of the voltage detection circuit 310 is coupled to the ground terminal. The third terminal of the voltage detection circuit 310 generates a voltage detection signal. Further, the voltage detection circuit 310 may include a transistor T2. The transistor T2 has a first terminal, a second terminal and a third terminal. The first terminal of transistor T2 serves as the first terminal of voltage detection circuit 310 . The second terminal of the transistor T2 serves as the second terminal of the voltage detection circuit 310 . The third terminal of the transistor T2 serves as the third terminal of the voltage detection circuit 310 .

In this embodiment, the transistor T2 is, for example, an N-type transistor, such as an N-type bipolar junction transistor, but the embodiment of the present invention is not limited thereto. The first terminal of the transistor T2 is, for example, the base terminal of the N-type transistor, the second terminal of the transistor T2 is, for example, the emitter terminal of the N-type transistor, and the third terminal of the transistor T2 is, for example, It is the collector end of the N-type transistor. In some embodiments, the transistor T2 may also be an N-type metal oxide semiconductor field effect transistor or other suitable transistor.

In this embodiment, when the divided voltage generated by the impedance voltage 210 reaches a preset voltage (such as the turn-on voltage of the transistor T2), the transistor T2 will be turned on, indicating that the state of the load 160 is normal. At this time, through the second terminal of the transistor T2 being connected to the ground terminal, the third terminal of the transistor T2 can generate, for example, a low logic level voltage detection signal, so that the control circuit 130 can correspondingly generate, for example, a low logic level voltage detection signal. control signal CS. When the divided voltage generated by the impedance voltage 210 does not reach the preset voltage (for example, the conduction voltage of the transistor T2), the transistor T2 does not conduct, indicating that the status of the load 160 is abnormal (for example, the load 160 is short-circuited). At this time, the third terminal of the transistor T2 can generate, for example, a voltage detection signal with a high logic level, so that the control circuit 130 can correspondingly generate, for example, a control signal CS with a high logic level. In this way, the short-circuit protection circuit 100 of this embodiment can also effectively prevent the abnormal load 160 from affecting the operation of the power supply device 150, thereby achieving a protection effect and increasing convenience of use.

Figure 4 is another circuit diagram of the short circuit protection circuit in Figure 1. The short-circuit protection circuit 100 of FIG. 4 is generally similar to the short-circuit protection circuit 100 of FIG. 2 . In this embodiment, the precharge circuit 110, the detection circuit 120, the main power switch circuit 140 and their internal components are the same as or similar to the precharge circuit 110, the detection circuit 120, the main power switch circuit 140 and their internal components in Figure 2 , please refer to the description of the embodiment in Figure 2, so no details will be given here.

The control circuit 130 includes a resistor R3, an impedance circuit 410, a voltage detection circuit 220, a resistor R4, a resistor R5 and a capacitor C1. In this embodiment, the resistor R3, the voltage detection circuit 220, the resistor R4, the resistor R5 and the capacitor C1 are the same or similar to the resistor R3, the voltage detection circuit 220, the resistor R4, the resistor R5 and the capacitor C1 in Figure 2. Please refer to Figure 2. The description of the embodiment shown in Figure 2 is omitted here.

Impedance circuit 410 includes resistor R8. The resistor R8 has a first terminal and a second terminal. The first terminal of the resistor R8 is coupled to the second terminal of the resistor R3 and the first terminal of the voltage detection circuit 220 to receive and output the detection voltage VB0 to the first terminal of the voltage detection circuit 220 . The second terminal of the resistor R8 is coupled to the ground terminal. In this way, the short-circuit protection circuit 100 of this embodiment can also effectively prevent the abnormal load 160 from affecting the operation of the power supply device 150, thereby achieving a protection effect and increasing convenience of use.

FIG. 5 is a schematic diagram of an electronic device according to an embodiment of the present invention. The electronic device 500 in this embodiment may be a network device, such as an access point (AP) device, but the embodiment of the present invention is not limited thereto. Please refer to FIG. 5 . The electronic device 500 includes a power supply device 510 , a plurality of short-circuit protection circuits 520_1 ~ 520_N and a plurality of loads 530_1 ~ 530_N, where N is a positive integer greater than 1.

Power supply device 510 generates input voltage VIN. The short circuit protection circuits 520_1 ~ 520_N are coupled to the power supply device 510 to receive the input voltage VIN and determine whether to output the input voltage VIN.

Each load 530_1~530_N is coupled to a short circuit protection circuit 520_1~520_N. That is to say, the load 530_1 is coupled to the short-circuit protection circuit 520_1, the load 530_2 is coupled to the short-circuit protection circuit 520_2, ..., and the load 530_N is coupled to the short-circuit protection circuit 520_N.

Each short-circuit protection circuit 520_1~520_N can detect the status of each load 530_1~530_N. When each short-circuit protection circuit 520_1~520_N detects that the status of each load 530_1~530_N is normal, each short-circuit protection circuit 520_1~520_N can output the input voltage VIN to each load 530_1~530_N, so that each load 530_1~530_N 530_N works fine.

In addition, when one of the short-circuit protection circuits 520_1~520_N (for example, the short-circuit protection circuit 520_1) detects that the status of the load (for example, 530_1) is abnormal, the short-circuit protection circuit 520_1 will not output the input voltage VIN to the short-circuit protection circuit 520_1. The load 530_1 is connected, that is, the short circuit protection circuit 520_1 can disconnect the power supply device 510 and the load 530_1. In this way, the electronic device 100 can effectively prevent the abnormal load 530_1 from affecting the operation of the power supply device 510 and other non-abnormal loads 530_2~530_N, thereby achieving a protection effect and increasing convenience of use.

In addition, in this embodiment, the power supply device 510 is the same as or similar to the power supply device 150 in Figures 1 to 4, and the loads 530_1 to 530_M are the same or similar to the loads 160 in Figures 1 to 4. Please refer to Section 1 Figure ~ Figure 4 shows the description of the embodiment, so it will not be described again here. In addition, the short-circuit protection circuits 520_1~520_N are also the same or similar to the short-circuit protection circuit 100 in Figures 1 to 4. Therefore, the internal circuits and operation methods of the short-circuit protection circuits 520_1~520_N can be referred to Figures 1 to 4. The description of the embodiment will not be repeated here.

FIG. 6 is a flow chart of an operating method of an electronic device according to an embodiment of the present invention. In step S602, a power supply device is provided to generate an input voltage. In step S604, multiple short-circuit protection circuits are provided and coupled to the power supply device. In step S606, multiple loads are provided, and each load is coupled to each short-circuit protection circuit. In step S608, the status of each load is detected through each short-circuit protection circuit. In step S610, when each short-circuit protection circuit detects that the state of each load is normal, each short-circuit protection circuit outputs the input voltage to each load. In step S612, when one of the short-circuit protection circuits detects that the state of the load is abnormal, the short-circuit protection circuit does not output the input voltage to the load coupled to the short-circuit protection circuit.

It is worth noting that the order of the steps in Figure 6 is only for illustrative purposes and is not intended to limit the order of the steps in the embodiments of the present invention, and the order of the above steps can be changed by the user according to his or her needs. Furthermore, the above flow chart may add additional steps or use fewer steps without departing from the spirit and scope of the invention.

In summary, the short-circuit protection circuit, electronic device and operating method disclosed in the present invention receive the input voltage through the precharge circuit to output the precharge current to the load, and the detection circuit receives the load voltage of the load to generate a detection signal. The control circuit generates a control signal based on the input voltage and the detection signal, and the main power switch circuit determines whether to output the input voltage to the load based on the control signal. In this way, it is possible to effectively prevent abnormal loads from affecting the operation of the power supply device or the operation of the power supply device and other loads that do not cause abnormality, thereby achieving a protective effect and increasing convenience of use.

Although the present invention is disclosed above through embodiments, they are not intended to limit the scope of the present invention. Anyone with ordinary knowledge in the relevant technical field can make slight changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the appended patent application scope.

100,520_1~520_N: Short circuit protection circuit 110: Precharge circuit 120:Detection circuit 130:Control circuit 140: Main power switch circuit 150,510:Power supply unit 160,530_1~530_N: load 210,410: Impedance circuit 220,310: Voltage detection circuit 221: Voltage comparator 500: Electronic devices R1, R2, R3, R4, R5, R6, R7, R8: Resistors C1: Capacitor D1: Diode T1, T2: transistor I1: precharge current CS: control signal VB0: detection signal VIN: input voltage S602~S612: steps

Figure 1 is a schematic diagram of a short circuit protection circuit according to an embodiment of the present invention. Figure 2 is a circuit diagram of the short-circuit protection circuit in Figure 1. Figure 3 is another circuit diagram of the short circuit protection circuit in Figure 1. Figure 4 is another circuit diagram of the short circuit protection circuit in Figure 1. FIG. 5 is a schematic diagram of an electronic device according to an embodiment of the present invention. FIG. 6 is a flow chart of an operating method of an electronic device according to an embodiment of the present invention.

100: Short circuit protection circuit 110: Precharge circuit 120:Detection circuit 130:Control circuit 140: Main power switch circuit 150:Power supply unit 160:Load I1: precharge current CS: control signal VB0: detection signal VIN: input voltage

Claims (12)

A short-circuit protection circuit includes: a precharge circuit that receives an input voltage to generate a precharge current to a load; a detection circuit that receives a load voltage of the load to generate a detection signal; a control circuit that couples Connect to the detection circuit, receive the input voltage and the detection signal, and generate a control signal according to the input voltage and the detection signal; and a main power switch circuit, coupled to the control circuit, receive the input voltage and the control signal , based on the control signal, decide whether to output the input voltage to the load. The short-circuit protection circuit of claim 1, wherein the control circuit includes: a first resistor having a first end and a second end, the first end of the first resistor receives the input voltage, and the first resistor The second end receives the detection signal; an impedance circuit is coupled to the second end of the first resistor; a voltage detection circuit has a first end, a second end and a third end, and the voltage detection circuit The first end of the circuit is coupled to the impedance circuit, the second end of the voltage detection circuit is coupled to the ground end, and the third end of the voltage detection circuit generates a voltage detection signal; a second resistor has a first terminal and a second terminal, the first terminal of the second resistor is coupled to the third terminal of the voltage detection circuit to receive the voltage detection signal, and the second terminal of the second resistor generates the control signal; The third resistor has a first end and a second end. The first end of the third resistor is coupled to the second end of the second resistor. The second end of the third resistor receives the input. voltage; and a capacitor having a first terminal and a second terminal, the first terminal of the capacitor is coupled to the first terminal of the third resistor, and the second terminal of the capacitor is coupled to the third resistor. The second end. The short-circuit protection circuit of claim 2, wherein the impedance circuit includes: a fourth resistor having a first end and a second end, and the first end of the fourth resistor is coupled to the first end of the first resistor. The second terminal is coupled to the first terminal of the voltage detection circuit, and the second terminal of the fourth resistor is coupled to a ground terminal. The short-circuit protection circuit of claim 2, wherein the impedance circuit includes: a fourth resistor having a first end and a second end, and the first end of the fourth resistor is coupled to the first end of the first resistor. a second terminal, the second terminal of the fourth resistor is coupled to the first terminal of the voltage detection circuit; and a fifth resistor having a first terminal and a second terminal, the first terminal of the fifth resistor The first terminal is coupled to the second terminal of the fourth resistor, and the second terminal of the fifth resistor is coupled to a ground terminal. The short circuit protection circuit of claim 4, wherein the voltage detection circuit includes a voltage comparator. The short-circuit protection circuit of claim 4, wherein the voltage detection circuit includes a transistor having a first terminal, a second terminal and a third terminal, and the first terminal of the transistor serves as the The first terminal of the voltage detection circuit, the transistor The second terminal serves as the second terminal of the voltage detection circuit, and the third terminal of the transistor serves as the third terminal of the voltage detection circuit. The short-circuit protection circuit of claim 1, wherein the main power switch circuit includes: a transistor having a first terminal, a second terminal and a third terminal, and the first terminal of the transistor receives the control signal, the second terminal of the transistor receives the input voltage, and the third terminal of the transistor outputs the input voltage. A short-circuit protection circuit includes: a precharge circuit that receives an input voltage to generate a precharge current to a load; a detection circuit that receives a load voltage of the load to generate a detection signal; a control circuit that couples Connect to the detection circuit, receive the input voltage and the detection signal, and generate a control signal according to the input voltage and the detection signal; and a main power switch circuit, coupled to the control circuit, receive the input voltage and the control signal , based on the control signal, decide whether to output the input voltage to the load; wherein the precharge circuit includes: a resistor with a first end and a second end, the first end of the resistor receives the input voltage, the The second terminal of the resistor generates the precharge current. A short-circuit protection circuit includes: a precharge circuit that receives an input voltage to generate a precharge current to a load; a detection circuit that receives a load voltage of the load to generate a detection signal; A control circuit, coupled to the detection circuit, receives the input voltage and the detection signal, and generates a control signal according to the input voltage and the detection signal; and a main power switch circuit, coupled to the control circuit, receives the input The voltage and the control signal determine whether to output the input voltage to the load according to the control signal; wherein the detection circuit includes: a resistor having a first end and a second end, and the first end of the resistor receives the load voltage; and a diode having a first end and a second end, the first end of the diode is coupled to the second end of the resistor, and the second end of the diode generates the detection signal. The short-circuit protection circuit of claim 9, wherein the diode is a Schottky diode. An electronic device, including: a power supply device generating an input voltage; a plurality of short-circuit protection circuits as described in claims 1 to 10, coupled to the power supply device; and a plurality of loads, each of the loads coupled to each These short-circuit protection circuits; wherein each of the short-circuit protection circuits detects a state of each of the loads, and when each of the short-circuit protection circuits detects that the state of each of the loads is normal, each Some of the short-circuit protection circuits output the input voltage to each of the loads, and when one of the short-circuit protection circuits detects that the state of the load is abnormal, the short-circuit protection circuit will not output the input voltage to the load. The load to which the short circuit protection circuit is coupled. An operating method of an electronic device, including: providing a power supply device to generate an input voltage; providing a plurality of short-circuit protection circuits as described in claims 1 to 10, coupled to the power supply device; providing a plurality of loads, and each of the Some loads are coupled to each of the short-circuit protection circuits; a state of each of the loads is detected through each of the short-circuit protection circuits; when each of the short-circuit protection circuits detects the state of each of the loads When it is normal, each of the short-circuit protection circuits outputs the input voltage to each of the loads; and when one of the short-circuit protection circuits detects that the state of the load is abnormal, the short-circuit protection circuit does not output the input voltage. Input voltage to the load coupled to the short circuit protection circuit.

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