A constant-voltage dimming lamp with high safety and a short-circuit protection method using the same

Abstract

The present invention discloses a constant-voltage dimming lamp with high safety and a short-circuit protection method using the same. The output end of the dimming output module in the constant-voltage dimming lamp includes a positive output end and a negative output end, and a lamp group is electrically connected between the positive output end and the negative output end. The dimming output module includes a MOS transistor. The S pole of the MOS transistor is grounded, the D pole of the MOS transistor is electrically connected to the negative output end to form a first branch, and the G pole of the MOS transistor is electrically connected to the signal output end of the adjustment signal module. The power input end of the adjustment signal module is electrically connected to the positive output end, and the current acquisition end of the adjustment signal module is electrically connected to the first branch. In the short-circuit protection method, the adjustment signal module calculates the number of times the MOS transistor is intermittently turned on and off. When the number of times the MOS transistor is intermittently turned on and off exceeds a preset number threshold, the MOS transistor is completely turned off. The present invention solves the problem that when water enters or a device short-circuits inside an existing lamp, it will cause the high-temperature ignition of the faulty device.

Description

Technical Field

[0001] The present invention relates to the technical field of lamps, in particular to a constant-voltage dimming lamp with high safety and a short-circuit protection method using the same. Background Art

[0002] The advantages of constant-voltage dimming lamps are simple circuits and low prices. When an output short-circuit anomaly occurs in a constant-voltage dimming lamp, the lamp can produce a flickering light effect by the power supply being in a hiccup state to notify the user that the lamp has an anomaly. However, there is also a certain risk. That is, when the load is a constant-current lamp or a load with other logic circuits inside, when water enters the lamp or a device short-circuits inside, a large amount of power will instantaneously accumulate on the faulty device, causing the device to have transient high temperature. At this time, if the power supply is always in a hiccup state, it will cause the faulty device to catch fire due to high temperature, posing a safety hazard. Summary of the Invention

[0003] Aiming at the above defects, the purpose of the present invention is to provide a constant-voltage dimming lamp with high safety, which solves the problem that the faulty device will catch fire due to high temperature after water enters the existing lamp or a device short-circuits inside.

[0004] Aiming at the above defects, another purpose of the present invention is to provide a short-circuit protection method, which solves the problem that the faulty device will catch fire due to high temperature after water enters the existing lamp or a device short-circuits inside.

[0005] To achieve this purpose, the present invention adopts the following technical solutions: A constant-voltage dimming lamp with high safety includes a power supply module, a dimming output module, a lamp group, and an adjustment signal module. The output end of the power supply module is electrically connected to the power input end of the dimming output module. The output end of the dimming output module includes a positive output end Vout+ and a negative output end Vout-. The lamp group is electrically connected between the positive output end Vout+ and the negative output end Vout-.

[0006] The dimming output module includes a MOS transistor Q1. The S pole of the MOS transistor Q1 is grounded. The D pole of the MOS transistor Q1 is electrically connected to the negative output end Vout-, forming a first branch. The G pole of the MOS transistor Q1 is electrically connected to the signal output end of the adjustment signal module.

[0007] The power input end of the adjustment signal module is electrically connected to the positive output end Vout+ of the dimming output module. The current acquisition end of the adjustment signal module is electrically connected to the first branch.

[0008] The adjustment signal module is used to adjust the MOS transistor Q1 to make the output end of the dimming output module turn on and off at intervals and calculate the number of times of on-off intervals when the current collected from the first branch exceeds the current threshold, and is also used to completely turn off the MOS transistor Q1 when the number of on-off intervals exceeds the number threshold.

[0009] It should be noted that a buck power supply module is further included, and the positive output terminal Vout+ of the dimming output module is electrically connected to the power input terminal of the adjustment signal module through the buck power supply module;

[0010] The positive pole of the input end of the buck power supply module is electrically connected to the positive output terminal Vout+ of the dimming output module, the negative pole of the input end of the buck power supply module is grounded, and the output end of the buck power supply module is electrically connected to the power input terminal of the adjustment signal module.

[0011] Optionally, the dimming output module further includes a resistor R1, and the resistor R1 is connected in series in the first branch;

[0012] The current acquisition terminal of the adjustment signal module is an AD conversion acquisition port, the current acquisition terminal of the adjustment signal module is electrically connected to the resistor R1, and the current acquisition terminal of the adjustment signal module is used to acquire the current of the resistor R1.

[0013] Specifically, a PWM signal module is further included, and the output end of the PWM signal module is communicatively connected to the signal input end of the adjustment signal module.

[0014] Preferably, an optocoupler UIA is further included, the emitting end of the optocoupler UIA is electrically connected to the output end of the PWM signal module, and the receiving end of the optocoupler UIA is electrically connected to the signal input end of the adjustment signal module.

[0015] It should be noted that the power supply module is a rectifier output mechanism, the positive pole of the output end of the power supply module is electrically connected to the positive output terminal Vout+ of the dimming output module, and the negative pole of the output end of the power supply module is grounded.

[0016] Optionally, the dimming output module further includes a common mode inductor LF1, the common mode inductor LF1 includes a first inductor coil and a second inductor coil, the input end of the first inductor coil is electrically connected to the positive pole of the output end of the power supply module, the output end of the first inductor coil is electrically connected to the positive output terminal Vout+, the input end of the second inductor coil is electrically connected to the D pole of the MOS transistor Q1, and the output end of the second inductor coil is electrically connected to the negative output terminal Vout-.

[0017] Specifically, a short-circuit protection method uses the described constant-voltage dimming lamp with high safety.

[0018] including the following steps:

[0019] A1: The adjustment signal module generates a first driving signal and inputs it to the G pole of the MOS transistor Q1 to control the on / off of the MOS transistor Q1, and performs chopping processing on the output voltage between the positive output terminal Vout+ and the negative output terminal Vout- of the dimming output module to control the effective value of the output voltage;

[0020] A2: The adjustment signal module collects the current of the first branch through the current acquisition terminal;

[0021] A3: Determine whether the current of the first branch exceeds a preset current threshold;

[0022] When the current of the first branch exceeds the preset current threshold, the adjustment signal module generates a second driving signal and inputs it to the G pole of the MOS transistor Q1 to control the MOS transistor Q1 to be intermittently turned on and off, causing the voltage between the positive output terminal Vout+ and the negative output terminal Vout- of the dimming output module to jump, causing the lamp group to flash;

[0023] A4: The adjustment signal module calculates the number of times the MOS transistor Q1 is intermittently turned on and off. When the number of times the MOS transistor Q1 is intermittently turned on and off exceeds a preset number threshold, the MOS transistor Q1 is completely turned off.

[0024] Preferably, step A4 is specifically: The adjustment signal module records the number of voltage jumps between the positive output terminal Vout+ of the dimming output module and the ground to calculate the number of times the MOS transistor Q1 is intermittently turned on and off.

[0025] It should be noted that step A4 is specifically: In the process of the adjustment signal module calculating the number of times the MOS transistor Q1 is intermittently turned on and off, when the time for turning on or off the MOS transistor Q1 twice is greater than a preset interval time, the counter of the adjustment signal module is cleared, and step A3 is re-executed to determine whether the current at the D pole of the MOS transistor Q1 exceeds the preset current threshold.

[0026] One of the above technical solutions has the following beneficial effects: In the above-mentioned constant-voltage dimming lamp with high safety, when an overload or short-circuit condition occurs, the adjustment signal module controls the on-off time of the MOS transistor Q1, so that the output voltage jumps in a hiccup state between the normal voltage and zero volts, thereby controlling the lamp group to flicker and notifying the user of an abnormality. When the abnormality persists, the lamp group will keep flickering. At this time, the adjustment signal module calculates the number of times the output end of the dimming output module is intermittently turned on and off. When the number is greater than the threshold, the adjustment signal module controls the MOS transistor Q1 to be completely cut off and enters a locked state. At this time, the output end of the dimming output module no longer outputs power, thus avoiding the malfunctioning device from catching fire due to high temperature generated by continuous operation after the abnormality, improving safety. Brief Description of the Drawings

[0027] Figure 1 is the circuit diagram of the constant-voltage dimming lamp of an embodiment of the present invention;

[0028] Figure 2 is the flowchart of the short-circuit protection method of an embodiment of the present invention.

[0029] Wherein: 1 power supply module; 2 dimming output module; 3 adjustment signal module; 4 step-down power supply module; 5 PWM signal module; 11 output end of the first inductor coil; 12 input end of the first inductor coil; 13 input end of the second inductor coil; 14 output end of the second inductor coil. Detailed Embodiment

[0030] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0031] The following will be combined with Figures 1 to 2, a constant-voltage dimming lamp with high safety described in an embodiment of the present invention, includes a power supply module 1, a dimming output module 2, a lamp group, and an adjustment signal module 3. The output end of the power supply module 1 is electrically connected to the power input end of the dimming output module 2. The output end of the dimming output module 2 includes a positive output end Vout+ and a negative output end Vout-. The lamp group is electrically connected between the positive output end Vout+ and the negative output end Vout-; the dimming output module 2 includes an MOS transistor Q1. The S pole of the MOS transistor Q1 is grounded. The D pole of the MOS transistor Q1 is electrically connected to the negative output end Vout-, forming a first branch. The G pole of the MOS transistor Q1 is electrically connected to the signal output end of the adjustment signal module 3; thus, the adjustment signal module 3 inputs a driving signal to the G pole of the MOS transistor Q1, controls the on / off of the S pole and D pole of the MOS transistor Q1, controls the on / off of the first branch, and realizes chopping processing of the output voltage between the positive output end Vout+ and the negative output end Vout-, thereby reducing the effective value of the output voltage, and further achieving the effect of adjusting the brightness of the lamp group. The power input end of the adjustment signal module 3 is electrically connected to the positive output end Vout+ of the dimming output module 2. The current acquisition end of the adjustment signal module 3 is electrically connected to the first branch; the positive output end Vout+ supplies power to the power input end of the adjustment signal module 3, and the current acquisition end of the adjustment signal module 3 is used to acquire the current of the first branch. The adjustment signal module 3 is used to, when the current of the first branch collected exceeds the current threshold, adjust the MOS transistor Q1 to make the output end of the dimming output module 2 intermittently on / off and calculate the number of times of intermittent on / off, and is also used to completely turn off the MOS transistor Q1 when the number of times of intermittent on / off exceeds the number threshold. Specifically, by extending the on / off time of the MOS transistor Q1, the output end of the dimming output module 2 can be made to intermittently on / off, so that the output voltage is in a hiccup state of jumping between the normal voltage and zero volts.

[0032] In the above-mentioned constant-voltage dimming lamp with high safety, when an overload or short-circuit condition occurs, the adjustment signal module 3 controls the on-off time of the MOS transistor Q1, so that the output voltage jumps between the normal voltage and zero volts in a hiccup state, thereby controlling the lamp group to flash and notifying the user of an abnormality. When the abnormality persists, the lamp group will keep flashing. At this time, the adjustment signal module 3 calculates the number of times the output terminal of the dimming output module 2 is intermittently turned on and off. When the number is greater than the threshold, the adjustment signal module 3 controls the MOS transistor Q1 to completely cut off and enter the locked state. At this time, the output terminal of the dimming output module 2 no longer outputs power, thus avoiding the malfunctioning device from catching fire due to high temperature caused by continuous operation after the abnormality, improving safety. Preferably, the adjustment signal module 3 is a single-chip microcomputer. The MOS transistor Q1 is an N-channel MOS transistor. The conduction and cut-off of the N-channel MOS transistor are controlled by the gate-source voltage. When the voltage at the gate is greater than the voltage at the source, the N-channel MOS transistor conducts, that is, the source and the drain conduct.

[0033] In some embodiments, a step-down power supply module 4 is further included. The positive output terminal Vout+ of the dimming output module 2 is electrically connected to the power input terminal of the adjustment signal module 3 through the step-down power supply module 4; the positive electrode of the input terminal of the step-down power supply module 4 is electrically connected to the positive output terminal Vout+ of the dimming output module 2, the negative electrode of the input terminal of the step-down power supply module 4 is grounded, and the output terminal of the step-down power supply module 4 is electrically connected to the power input terminal of the adjustment signal module 3. After the voltage between the positive output terminal Vout+ of the dimming output module 2 and the ground is input into the step-down power supply module 4, the step-down power supply module 4 reduces the voltage and supplies power to the adjustment signal module 3 to avoid damaging the adjustment signal module 3 due to excessive voltage. Since the power supply of the adjustment signal module 3 is obtained by stepping down the negative output terminal Vout-, when the output terminal of the dimming output module 2 enters the hiccup state, the output voltage will also hiccup intermittently, and the power supply of the adjustment signal module 3 will also hiccup intermittently. Therefore, the adjustment signal module 3 monitors its own power supply hiccup state to determine whether it is in the protection state, and then completely turns off the MOS transistor Q1 to protect the lamp strip and the load device.

[0034] It should be noted that the dimming output module 2 further includes a resistor R1, and the resistor R1 is connected in series to the first branch; the current acquisition terminal of the adjustment signal module 3 is an AD conversion acquisition port, and the current acquisition terminal of the adjustment signal module 3 is electrically connected to the resistor R1. The current acquisition terminal of the adjustment signal module 3 is used to acquire the current of the resistor R1. Since the D pole of the MOS transistor Q1, the resistor R1, and the negative output terminal Vout- of the dimming output module 2 are connected in series, thus, the current flowing through the D pole of the MOS transistor Q1, the resistor R1, and the negative output terminal Vout- of the dimming output module 2 is equal. Therefore, the current flowing through the resistor R1 can reflect the current condition of the negative output terminal Vout- of the dimming output module 2.

[0035] A resistor R1 is added to detect the output current, and combined with the record of the hiccup times of the output voltage after protection, so that not only the occurrence of a short circuit can be easily detected, but also the safety of the faulty area can be well protected; when an overload or short circuit fault occurs, not only the user is notified of the occurrence of the fault, but also the safety can be taken into account at the same time; at the same time, the power supply of the adjustment signal module 3 is obtained by stepping down the output voltage, so that the adjustment signal module 3 is connected to the output voltage. By using the adjustment signal module 3 to monitor the supply voltage, the sampling of the output protection state is completed.

[0036] Optionally, it further includes a PWM signal module 5, and the output terminal of the PWM signal module 5 is communicatively connected to the signal input terminal of the adjustment signal module 3. The adjustment signal module 3 collects the PWM dimming signal generated by the PWM signal module 5 and converts it into a drive signal and inputs it to the G pole of the MOS transistor Q1, thereby controlling the on and off of the MOS transistor Q1. The process of the adjustment signal module 3 converting the PWM dimming signal into a drive signal is an existing technology and will not be elaborated here one by one.

[0037] Specifically, it further includes an optocoupler UIA. The emitting end of the optocoupler UIA is electrically connected to the output terminal of the PWM signal module 5, and the receiving end of the optocoupler UIA is electrically connected to the signal input terminal of the adjustment signal module 3. An optocoupler is an electro-optical conversion device that transmits electrical signals through light. It consists of two parts: a light-emitting source and a light-receiving device. One end of the light-emitting source is the emitting end, and one end of the light-receiving device is the receiving end. Since the emitting end and the receiving end of the optocoupler UIA are isolated from each other and the electrical signal transmission has characteristics such as unidirectionality, it has good electrical insulation ability and anti-interference ability.

[0038] Preferably, the power supply module 1 is a rectifying and outputting mechanism. The positive pole of the output end of the power supply module 1 is electrically connected to the positive pole output end Vout+ of the dimming output module 2, and the negative pole of the output end of the power supply module 1 is grounded. The commercial power is rectified from alternating current to direct current after passing through the power supply module 1, thus facilitating the power supply to the lamp group.

[0039] In some embodiments, the dimming output module 2 further includes a common-mode inductor LF1. The common-mode inductor LF1 includes a first inductor coil and a second inductor coil. The input end 12 of the first inductor coil is electrically connected to the positive pole of the output end of the power supply module 1, the output end 11 of the first inductor coil is electrically connected to the positive pole output end Vout+, the input end 13 of the second inductor coil is electrically connected to the D pole of the MOS transistor Q1, and the output end 14 of the second inductor coil is electrically connected to the negative pole output end Vout-. The common-mode inductor LF1 is used to filter the common-mode electromagnetic interference signals and also to suppress the electromagnetic waves generated by the high-speed signal lines from radiating outward.

[0040] It should be noted that a short-circuit protection method uses the described constant-voltage dimming lamp with high safety.

[0041] It includes the following steps:

[0042] A1: The adjustment signal module 3 generates a first driving signal and inputs it to the G pole of the MOS transistor Q1 to control the on / off of the MOS transistor Q1, and performs chopping processing on the output voltage between the positive pole output end Vout+ and the negative pole output end Vout- of the dimming output module 2 to control the effective value of the output voltage.

[0043] A2: The adjustment signal module 3 collects the current of the first branch through the current acquisition terminal.

[0044] A3: Determine whether the current of the first branch exceeds a preset current threshold.

[0045] When the current of the first branch exceeds the preset current threshold, the adjustment signal module 3 generates a second driving signal and inputs it to the G pole of the MOS transistor Q1 to control the MOS transistor Q1 to be intermittently on / off, causing the voltage between the positive pole output end Vout+ and the negative pole output end Vout- of the dimming output module 2 to fluctuate and making the lamp group flicker.

[0046] A4: The adjustment signal module 3 calculates the number of times the MOS transistor Q1 is intermittently on / off. When the number of times the MOS transistor Q1 is intermittently on / off exceeds a preset number threshold, the MOS transistor Q1 is completely turned off.

[0047] Optionally, step A4 is specifically as follows: The regulation signal module 3 records the number of voltage fluctuations between the positive output terminal Vout+ of the dimming output module 2 and the ground to calculate the number of times the MOS transistor Q1 is turned on and off at intervals.

[0048] Specifically, step A4 is specifically as follows: When calculating the number of times the MOS transistor Q1 is turned on and off at intervals in the regulation signal module 3, when the time for turning on or off the MOS transistor Q1 twice is greater than a preset interval time, the counter of the regulation signal module 3 is cleared, and step A3 is executed again to determine whether the current at the D pole of the MOS transistor Q1 exceeds a preset current threshold. In this way, when the time for turning on or off the MOS transistor Q1 twice is greater than the preset interval time, it is considered that the MOS transistor Q1 is turned on and off at intervals has ended, so it is necessary to determine again whether the current at the D pole of the MOS transistor Q1 exceeds the preset current threshold.

[0049] In some embodiments, when the circuit of the constant-voltage dimming lamp is short-circuited, the output voltage between the positive output terminal Vout+ and the negative output terminal Vout- is in a hiccup state, that is, there is an output voltage interval between the positive output terminal Vout+ and the negative output terminal Vout-; then the power supply of the dimming output module 2 will also enter a hiccup state with an interval voltage; when the dimming output module 2 detects the power supply hiccup once, the counter of the dimming output module 2 is incremented by 1. If the time between two hiccups is less than the interval time, the counter is incremented by 1 again until the count of the counter reaches the number threshold, then the dimming output module 2 stops outputting the driving signal, completely turns off the MOS transistor Q1, and the lamp group is powered off. After that, it is necessary to restart the constant-voltage dimming lamp to power on the lamp group. Preferably, the number threshold is 8 times and the interval time is 5 seconds.

[0050] Other components and operations of the constant-voltage dimming lamp with high safety and the short-circuit protection method using the same according to the embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail here.

[0051] In the description of this specification, the description with reference to terms such as "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0052] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A constant-voltage dimming lamp with high safety, characterized in that: It includes a power supply module, a dimming output module, a lamp group and an adjustment signal module. The output end of the power supply module is electrically connected to the power input end of the dimming output module. The output end of the dimming output module includes a positive output terminal Vout+ and a negative output terminal Vout-. The lamp group is electrically connected between the positive output terminal Vout+ and the negative output terminal Vout-. The dimming output module includes a MOS transistor Q1. The S pole of the MOS transistor Q1 is grounded. The D pole of the MOS transistor Q1 is electrically connected to the negative output terminal Vout-, forming a first branch. The G pole of the MOS transistor Q1 is electrically connected to the signal output end of the adjustment signal module. The power input end of the adjustment signal module is electrically connected to the positive output terminal Vout+ of the dimming output module. The current acquisition end of the adjustment signal module is electrically connected to the first branch. The adjustment signal module is used to adjust the MOS transistor Q1 to make the output end of the dimming output module intermittently turn on and off and calculate the number of times of intermittent on and off when the current of the first branch exceeds the current threshold, and is also used to completely turn off the MOS transistor Q1 when the number of times of intermittent on and off exceeds the number threshold.

2. The highly secure constant voltage dimming lamp according to claim 1, wherein: It also includes a step-down power supply module. The positive output terminal Vout+ of the dimming output module is electrically connected to the power input end of the adjustment signal module through the step-down power supply module. The positive pole of the input end of the step-down power supply module is electrically connected to the positive output terminal Vout+ of the dimming output module. The negative pole of the input end of the step-down power supply module is grounded. The output end of the step-down power supply module is electrically connected to the power input end of the adjustment signal module.

3. A constant voltage dimming lamp with high safety according to claim 1, characterized in that: The dimming output module also includes a resistor R1. The resistor R1 is connected in series in the first branch. The current acquisition end of the adjustment signal module is an AD conversion acquisition port. The current acquisition end of the adjustment signal module is electrically connected to the resistor R1. The current acquisition end of the adjustment signal module is used to acquire the current of the resistor R1.

4. The highly secure constant voltage dimming lamp according to claim 1, characterized in that: It also includes a PWM signal module. The output end of the PWM signal module is communicatively connected to the signal input end of the adjustment signal module.

5. The highly safe constant voltage dimming lamp according to claim 4, characterized in that: It also includes an optocoupler UIA. The emitting end of the optocoupler UIA is electrically connected to the output end of the PWM signal module. The receiving end of the optocoupler UIA is electrically connected to the signal input end of the adjustment signal module.

6. A constant voltage dimming lamp with high safety according to claim 1, characterized in that: The power supply module is a rectifying output mechanism. The positive pole of the output end of the power supply module is electrically connected to the positive output terminal Vout+ of the dimming output module. The negative pole of the output end of the power supply module is grounded.

7. The highly secure constant voltage dimming lamp according to claim 6, characterized in that: The dimming output module also includes a common mode inductor LF1. The common mode inductor LF1 includes a first inductor coil and a second inductor coil. The input end of the first inductor coil is electrically connected to the positive pole of the output end of the power supply module. The output end of the first inductor coil is electrically connected to the positive output terminal Vout+. The input end of the second inductor coil is electrically connected to the D pole of the MOS transistor Q1. The output end of the second inductor coil is electrically connected to the negative output terminal Vout-.

8. A short-circuit protection method, characterized in that: Use the constant-voltage dimming lamp with high safety described in claim 1; It includes the following steps: A1: The regulation signal module generates a first drive signal and inputs it to the G pole of the MOS transistor Q1 to control the on-off of the MOS transistor Q1, and performs chopping processing on the output voltage between the positive output terminal Vout+ and the negative output terminal Vout- of the dimming output module to control the effective value of the output voltage; A2: The regulation signal module collects the current of the first branch through the current acquisition terminal; A3: Determine whether the current of the first branch exceeds a preset current threshold; When the current of the first branch exceeds the preset current threshold, the regulation signal module generates a second drive signal and inputs it to the G pole of the MOS transistor Q1 to control the intermittent on-off of the MOS transistor Q1, causing the voltage between the positive output terminal Vout+ and the negative output terminal Vout- of the dimming output module to fluctuate, and causing the lamp group to flicker; A4: The regulation signal module calculates the number of times the MOS transistor Q1 is intermittently turned on and off. When the number of times the MOS transistor Q1 is intermittently turned on and off exceeds a preset number threshold, the MOS transistor Q1 is completely turned off.

9. A short-circuit protection method according to claim 8, characterized in that: The specific step A4 is: The regulation signal module records the number of voltage fluctuations between the positive output terminal Vout+ of the dimming output module and the ground to calculate the number of times the MOS transistor Q1 is intermittently turned on and off.

10. A short-circuit protection method according to claim 8, characterized in that: The specific step A4 is: In the process of the regulation signal module calculating the number of times the MOS transistor Q1 is intermittently turned on and off, when the time for turning on or off the MOS transistor Q1 twice is greater than a preset interval time, the count of the regulation signal module is cleared, and step A3 is executed again to determine whether the current at the D pole of the MOS transistor Q1 exceeds the preset current threshold.

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