Anti-burning circuit for misplug of power supply

Abstract

The utility model discloses a power supply misplug anti-burning circuit, which comprises a first resistor, a second resistor, a capacitor, a field effect transistor and a socket, the first end of the first resistor is used for being electrically connected with the positive electrode of a power supply, the second end of the first resistor is electrically connected with the first end of the second resistor, and the second end of the second resistor is grounded; a first end of the capacitor is electrically connected with a protected ground connection end of the socket, and a second end of the capacitor is electrically connected with a source electrode of the field effect transistor; the source electrode of the field effect transistor is electrically connected with the total ground connection end of the socket, the drain electrode of the field effect transistor is grounded, and the grid electrode of the field effect transistor is electrically connected with the second end of the first resistor. The utility model has the advantages of small volume, simple structure and low cost.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply, in particular to a circuit for preventing burning when power supply is mis-inserted. Background Art

[0002] At present, most industrial computer control boards use 3PIN Phoenix terminal blocks for power supplies. During factory assembly and testing or when users insert or plug in the wrong way during the application process, the current of the power supply increases, which burns out the power supply and the accompanying motherboard, causing economic losses to users and suppliers, increasing the cost of repairs, and giving users a bad product experience. In some special application scenarios, it may even cause a fire. To solve the above problems, technicians in this field usually use control chips and circuit breakers and other devices to achieve this. However, the circuit is complex, the volume is large, and the cost is high. Utility Model Content

[0003] The technical problem solved by the utility model is to provide a power mis-insertion burn-proof circuit which has a simple structure, a small volume and a low cost.

[0004] The utility model provides a power supply mis-insertion burn-proof circuit, comprising a first resistor, a second resistor, a capacitor, a field effect tube and a socket, wherein the first end of the first resistor is used to be electrically connected to the positive electrode of the power supply, the second end of the first resistor is electrically connected to the first end of the second resistor, and the second end of the second resistor is grounded; the first end of the capacitor is electrically connected to the protective ground connection end of the socket, and the second end of the capacitor is electrically connected to the source of the field effect tube; the source of the field effect tube is electrically connected to the general ground connection end of the socket, the drain of the field effect tube is grounded, and the gate of the field effect tube is electrically connected to the second end of the first resistor.

[0005] Preferably, the power mis-insertion burn prevention circuit also includes an alarm, which includes a switch unit and a warning light, and the switch unit includes a diode, a thyristor and a third resistor, the anode of the diode is electrically connected to the first end of the capacitor, and the cathode of the diode is electrically connected to the gate of the thyristor; the anode of the thyristor is electrically connected to the first connection end of the warning light, the first end of the third resistor is electrically connected to the anode of the diode, the second end of the third resistor is used to be electrically connected to the power supply, and the second end of the warning light is electrically connected to the second end of the third resistor.

[0006] Preferably, the warning light is a red LED light.

[0007] Preferably, the power mis-insertion burn-proof circuit further comprises a buzzer, a first end of the buzzer is electrically connected to the second end of the third resistor, and a second end of the buzzer is electrically connected to the anode of the thyristor.

[0008] Preferably, the power mis-insertion and burn-proof circuit also includes a sound circuit, which includes a voltage regulator, a fourth resistor, a fifth resistor and a sound chip, the anode of the voltage regulator is electrically connected to the anode of the thyristor, the cathode of the voltage regulator is electrically connected to the power input end of the sound chip and the first end of the fourth resistor, the second end of the fourth resistor is electrically connected to the second end of the warning light; the fifth resistor is electrically connected to the crystal oscillator signal connection end of the sound chip, and the signal output end of the sound chip is electrically connected to the buzzer.

[0009] Preferably, the power mis-insertion burn-proof circuit further comprises a signal amplifying chip, and the signal output end of the sound chip is electrically connected to the buzzer via the signal amplifying chip.

[0010] Preferably, the field effect transistor is an N-channel enhancement type field effect transistor.

[0011] Preferably, the capacitor is an electrolytic capacitor.

[0012] The utility model has the following beneficial effects: the utility model cooperates with the first resistor, the second resistor, the capacitor, the field effect tube and the socket. When the user correctly inserts the power supply into the socket, the power supply is divided by the first resistor and the second resistor to cause the field effect tube to conduct, and the power supply and the load-end device form a loop through the field effect tube. When the user incorrectly inserts the power supply into the socket, it is equivalent to connecting the positive and negative poles in reverse, the field effect tube is not conducting, and the socket has no power output, thereby avoiding burning the power supply and the load-end device. The utility model has the advantages of simple structure, small size and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is a circuit diagram of an embodiment of a power mis-insertion burn-proof circuit of the present invention.

[0014] Figure 2 It is a partial circuit diagram of another embodiment of the power mis-insertion burn-proof circuit of the utility model. DETAILED DESCRIPTION

[0015] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments. It should be noted that, if there is no conflict, the embodiments of the present invention and the various features in the embodiments can be combined with each other, all within the protection scope of the present invention.

[0016] See also Figure 1The utility model provides a power mis-insertion burn-proof circuit, comprising a first resistor R1, a second resistor R2, a capacitor C, a field effect tube Q and a socket J, wherein the first end of the first resistor R1 is used to be electrically connected to the positive electrode of the power supply, the second end of the first resistor R1 is electrically connected to the first end of the second resistor R2, and the second end of the second resistor R2 is grounded; the first end of the capacitor C is electrically connected to the protective ground connection end of the socket J, and the second end of the capacitor C is electrically connected to the source of the field effect tube Q; the source of the field effect tube Q is electrically connected to the total ground connection end of the socket J, the drain of the field effect tube Q is grounded, and the gate of the field effect tube Q is electrically connected to the second end of the first resistor R1. Wherein, the field effect tube Q is an N-channel enhancement type field effect tube Q, and the capacitor C is an electrolytic capacitor C.

[0017] See also Figure 2 In one embodiment, the power mis-insertion burn prevention circuit further includes an alarm, the alarm includes a switch unit 1 and a warning light EL, the switch unit 1 includes a diode VD, a thyristor VT and a third resistor R3, the anode of the diode VD is electrically connected to the first end of the capacitor C, the cathode of the diode VD is electrically connected to the gate of the thyristor VT; the anode of the thyristor VT is electrically connected to the first connection end of the warning light EL, the first end of the third resistor R3 is electrically connected to the anode of the diode VD, the second end of the third resistor R3 is used to be electrically connected to the power supply, and the second end of the warning light EL is electrically connected to the second end of the third resistor R3. Preferably, the warning light EL is a red LED light, so that better reminders can be achieved.

[0018] In one embodiment, the power mis-insertion burn-proof circuit further includes a buzzer BL, a first end of the buzzer BL is electrically connected to the second end of the third resistor R3, and a second end of the buzzer BL is electrically connected to the anode of the thyristor VT.

[0019] In one embodiment, the power mis-insertion and burn-proof circuit further includes a sound effect circuit 2, which includes a voltage regulator tube VS, a fourth resistor R4, a fifth resistor R5 and a sound effect chip U1. The anode of the voltage regulator tube VS is electrically connected to the anode of the thyristor VT, the cathode of the voltage regulator tube VS is electrically connected to the power input end of the sound effect chip U1 and the first end of the fourth resistor R4, and the second end of the fourth resistor R4 is electrically connected to the second end of the warning light EL; the fifth resistor R5 is electrically connected to the crystal oscillator signal connection end of the sound effect chip U1, and the signal output end of the sound effect chip U1 is electrically connected to the buzzer BL. The model of the sound effect chip U1 is KD9651.

[0020] In one embodiment, the power mis-insertion burn-proof circuit further includes a signal amplifier chip U2, and the signal output end of the sound chip U1 is electrically connected to the buzzer BL through the signal amplifier chip U2. The model of the signal amplifier chip U2 is TWH8751. The audio signal is amplified by the signal amplifier chip U2, so that sufficient sound signals can be obtained.

[0021] In summary, the utility model cooperates with the first resistor R1, the second resistor R2, the capacitor C, the field effect transistor Q and the socket J. When the user correctly inserts the power supply into the socket J, the power is divided by the first resistor R1 and the second resistor R2 to cause the field effect transistor Q to conduct, and the power supply and the load-end device form a loop through the field effect transistor Q. When the user incorrectly inserts the power supply into the socket J, it is equivalent to connecting the positive and negative poles in reverse, the field effect transistor Q is not conducting, and the socket J has no power output, thereby avoiding burning the power supply and the load-end device. The utility model has the advantages of simple structure, small size and low cost.

[0022] The above is a detailed introduction to the power mis-insertion and burn-proof circuit provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. At the same time, for those of ordinary skill in the art, according to the idea of ​​the utility model, there will be changes in the specific implementation method and application scope. In summary, the content of this specification is only an implementation method of the utility model, and it does not limit the patent scope of the utility model. All equivalent structures or equivalent process changes made using the contents of the utility model specification and drawings, or directly or indirectly used in other related technical fields, are similarly included in the patent protection scope of the utility model and should not be understood as limitations on the utility model.

Claims

1. A power mis-insertion burn-proof circuit, characterized in that: It comprises a first resistor, a second resistor, a capacitor, a field effect transistor and a socket, wherein the first end of the first resistor is used to be electrically connected to the positive electrode of a power supply, the second end of the first resistor is electrically connected to the first end of the second resistor, and the second end of the second resistor is grounded; the first end of the capacitor is electrically connected to the protective ground connection end of the socket, and the second end of the capacitor is electrically connected to the source of the field effect transistor; the source of the field effect transistor is electrically connected to the general ground connection end of the socket, the drain of the field effect transistor is grounded, and the gate of the field effect transistor is electrically connected to the second end of the first resistor.

2. The power mis-insertion burn-proof circuit according to claim 1, characterized in that: The power mis-insertion burn prevention circuit also includes an alarm, which includes a switch unit and a warning light. The switch unit includes a diode, a thyristor and a third resistor. The anode of the diode is electrically connected to the first end of the capacitor, and the cathode of the diode is electrically connected to the gate of the thyristor; the anode of the thyristor is electrically connected to the first connection end of the warning light, the first end of the third resistor is electrically connected to the anode of the diode, the second end of the third resistor is used to be electrically connected to the power supply, and the second end of the warning light is electrically connected to the second end of the third resistor.

3. The power mis-insertion burn-proof circuit according to claim 2, characterized in that: The warning light is a red LED light.

4. The power mis-insertion burn-proof circuit according to claim 2, characterized in that: The power mis-insertion burn-proof circuit further includes a buzzer, a first end of the buzzer is electrically connected to the second end of the third resistor, and a second end of the buzzer is electrically connected to the anode of the thyristor.

5. The power mis-insertion burn-proof circuit according to claim 4, characterized in that: The power mis-insertion and burn-proof circuit also includes a sound circuit, which includes a voltage regulator, a fourth resistor, a fifth resistor and a sound chip. The anode of the voltage regulator is electrically connected to the anode of the thyristor, the cathode of the voltage regulator is electrically connected to the power input end of the sound chip and the first end of the fourth resistor, and the second end of the fourth resistor is electrically connected to the second end of the warning light; the fifth resistor is electrically connected to the crystal oscillator signal connection end of the sound chip, and the signal output end of the sound chip is electrically connected to the buzzer.

6. The power mis-insertion burn-proof circuit according to claim 5, characterized in that: The power mis-insertion burn-proof circuit also includes a signal amplifying chip, and the signal output end of the sound chip is electrically connected to the buzzer through the signal amplifying chip.

7. The power mis-insertion burn-proof circuit according to claim 1 or 2, characterized in that: The field effect transistor is an N-channel enhancement type field effect transistor.

8. The power mis-insertion burn-proof circuit according to claim 1 or 2, characterized in that: The capacitor is an electrolytic capacitor.

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