CN213341629U - DC power supply electrostatic surge protection circuit and power supply system - Google Patents
DC power supply electrostatic surge protection circuit and power supply system Download PDFInfo
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- CN213341629U CN213341629U CN202021063505.XU CN202021063505U CN213341629U CN 213341629 U CN213341629 U CN 213341629U CN 202021063505 U CN202021063505 U CN 202021063505U CN 213341629 U CN213341629 U CN 213341629U
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Abstract
The utility model relates to the field of direct current power supply, in particular to a direct current power supply electrostatic surge protection circuit and a power supply system, which comprises a first resistor, a second resistor, a third resistor, a voltage stabilizing diode, a triode and a PMOS (P-channel metal oxide semiconductor) tube; the cathode of the voltage stabilizing diode is connected to the input end of the direct current power supply through the first resistor, and the anode of the voltage stabilizing diode is grounded; the base electrode of the triode is connected with the first resistor through the second resistor, the emitter electrode of the triode is connected with the input end of the direct-current power supply, and the collector electrode of the triode is connected with the grid electrode of the PMOS tube; and the source electrode of the PMOS tube is connected to the input end of the direct-current power supply, the grid electrode of the PMOS tube is grounded through the resistor, and the drain electrode of the PMOS tube is connected to the output end of the direct-current power supply. The utility model discloses the characteristic combination that utilizes different devices is a device, and is more succinct in the actual design is used, and occupation space is little, protects electrostatic surge, reduces the defective rate of electronic product in electric wire netting lagging region by a wide margin.
Description
Technical Field
The utility model relates to a direct current power supply field especially relates to a direct current power supply electrostatic surge protection circuit and power supply system.
Background
At present, various electronic products on the market are supplied with power after being converted into a direct current power supply through alternating current commercial power. In the area where the mains supply network is unstable, the voltage converted and output by the power adapter is instable and high instantly due to the fluctuation of the power network, the power adapter is possibly damaged to cause overhigh input voltage, and overhigh direct-current voltage can directly damage internal electronic components of a rear-stage product, so that the product fails to work normally.
SUMMERY OF THE UTILITY MODEL
The utility model provides a DC power supply electrostatic surge protection circuit and power supply system, the technical problem of solution is, in the unstable area of commercial power supply network, too high DC voltage can directly damage the inside electronic components of back level product to lead to the electronic product inefficacy can not normally work.
In order to solve the above technical problems, the present invention provides a dc power supply electrostatic surge protection circuit, which includes a first resistor, a second resistor, a third resistor, a zener diode, a triode, and a PMOS transistor;
the cathode of the voltage stabilizing diode is connected to the input end of the direct current power supply through the first resistor, and the anode of the voltage stabilizing diode is grounded;
the base electrode of the triode is connected with the first resistor through the second resistor, the emitter electrode of the triode is connected with the input end of the direct-current power supply, and the collector electrode of the triode is connected with the grid electrode of the PMOS tube;
and the source electrode of the PMOS tube is connected to the input end of the direct-current power supply, the grid electrode of the PMOS tube is grounded through the resistor, and the drain electrode of the PMOS tube is connected to the output end of the direct-current power supply.
Furthermore, the device also comprises a TVS tube with a negative electrode connected to the input end of the direct-current power supply, and a positive electrode of the TVS tube is grounded;
the TVS tube is used for preventing transient impact of nanosecond and microsecond signals.
Further, the turn-on voltage of the dc power supply electrostatic surge protection circuit is the regulated voltage VZD2 of the zener diode.
Further, the stable voltage of the input end of the direct current power supply is Vin，Vin＝VZD2+0.7V，VZD2Is the regulated voltage of the zener diode.
Further, the resistance value of the first resistor is in inverse proportion to the minimum voltage stabilizing current of the voltage stabilizing diode.
Furthermore, the transistor also comprises a capacitor connected between the source electrode and the grid electrode of the PMOS transistor.
Furthermore, the transistor also comprises a fourth resistor connected between the source electrode and the grid electrode of the PMOS transistor.
The utility model also provides a DC power supply system, include DC power supply electrostatic surge protection circuit.
The utility model provides a DC power supply electrostatic surge protection circuit and a power supply system, which comprises a first resistor, a second resistor, a third resistor, a voltage stabilizing diode, a triode and a PMOS (P-channel metal oxide semiconductor) tube; the cathode of the voltage stabilizing diode is connected to the input end of the direct current power supply through the first resistor, and the anode of the voltage stabilizing diode is grounded; the base electrode of the triode is connected with the first resistor through the second resistor, the emitter electrode of the triode is connected with the input end of the direct-current power supply, and the collector electrode of the triode is connected with the grid electrode of the PMOS tube; and the source electrode of the PMOS tube is connected to the input end of the direct-current power supply, the grid electrode of the PMOS tube is grounded through the resistor, and the drain electrode of the PMOS tube is connected to the output end of the direct-current power supply. The utility model discloses the characteristic combination that utilizes different devices is a device, and is more succinct in the actual design is used, and occupation space is little, protects electrostatic surge, reduces the defective rate of electronic product in electric wire netting lagging region by a wide margin.
Drawings
Fig. 1 is a circuit diagram of the dc power supply electrostatic surge protection provided by the embodiment of the present invention.
Detailed Description
The following embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are given for illustrative purposes only and are not to be construed as limiting the invention, including the drawings, which are only used for reference and illustration, and do not constitute a limitation to the scope of the invention, since many changes may be made thereto without departing from the spirit and scope of the invention.
As shown in fig. 1, for the embodiment of the present invention provides a dc power supply electrostatic surge protection circuit diagram, including a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a zener diode D2, a triode T1, a PMOS transistor Q1, a TVS transistor D1, and a capacitor C1; the negative electrode of the TVS tube D1 is connected to the input end of the direct-current power supply, and the positive electrode of the TVS tube D1 is grounded; the cathode of the voltage-stabilizing diode D2 is connected to the input end of the direct-current power supply through the first resistor R1, and the anode is grounded; the base electrode of the triode T1 is connected with the first resistor R1 through the second resistor R2, the emitter is connected with the input end of a direct-current power supply, and the collector is connected with the grid electrode of the PMOS transistor Q1; the source electrode of the PMOS tube Q1 is connected to the input end of a direct-current power supply, the grid electrode of the PMOS tube Q1 is grounded through the resistor R3, and the drain electrode of the PMOS tube Q1 is connected to the output end of the direct-current power supply; the capacitor C1 is connected between the source and the gate of the PMOS transistor Q1; the fourth resistor R4 is connected between the source and the gate of the PMOS transistor Q1 and connected in parallel with the capacitor C1.
The invention packages the functional requirements of the above principle into a semiconductor device, and the device is divided into different specification grades for different requirement scenes.
The embodiment of the utility model provides a pair of DC power supply electrostatic surge protection circuit theory of operation does:
taking 5V power input as an example, a zener diode D2 with a regulated voltage of 5.6V is selected, and users can select zener diodes with different regulated voltages according to the voltage withstanding requirement of the circuit to be protected at the rear stage of the output terminal.
When the voltage of the direct-current power supply input end VCC _ IN is within 5.6V, the voltage-stabilizing diode D2 cannot be conducted, the voltage of the base electrode and the voltage of the emitter electrode of the triode T1 are the same, and the triode T1 cannot be conducted; at this time, the PMOS transistor Q1 is turned on, and the voltage at the dc power output terminal is equal to the dc power input terminal VCC _ IN.
When the voltage at the dc power input terminal VCC _ IN exceeds 5.6V, the zener diode D2 is turned on. The voltage between the base electrode and the emitter electrode of the triode T1 is not 0, and the triode T1 starts to be conducted; therefore, the grid voltage of the PMOS tube Q1 is equal to the source voltage, the PMOS tube Q1 is cut off, and the power supply is cut off, and the three-level tube with the MMBT3906 model and the PMOS tube with the MEM2307 model are selected in the embodiment.
R1 is a current-limiting resistor for limiting the power consumption of the voltage stabilizing diode D2 under overvoltage, and R1 is selected according to the minimum voltage stabilizing current of the voltage stabilizing tube, wherein a resistor with the resistance value of 10K is selected. In the present embodiment, the resistors R2 and R3 have a resistance of 10K, the resistor R4 has a resistance of 100K, and the resistor C3 has a resistance of 100 nF.
The stable voltage of the input end of the direct current power supply is VinApproximately +0.7V, i.e., V, of the diode regulated voltage of the voltage regulator tubein＝VZD2+0.7V，VZD2The regulated voltage of the zener diode D2 is about 5.6+ 0.7V, 6.3V.
Since the response time of the triode T1 and the PMOS Q1 to the nanosecond and microsecond signals is not fast enough, the TVS tube D1 is added; the D1 mainly has the functions of preventing nanosecond and microsecond transient impacts, such as ESD electrostatic discharge, EOS electrical overload and the like, different withstand voltage and power level designs are used according to different use occasions to meet different specification requirements, and the TVS tube with the model number of 1.5KE6.8A is selected in the embodiment.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (8)
1. A kind of direct-flow power supply electrostatic surge protective circuit, characterized by that, comprising: the circuit comprises a first resistor (R1), a second resistor (R2), a third resistor (R3), a voltage stabilizing diode (D2), a triode (T1) and a PMOS (Q1);
the cathode of the voltage-stabilizing diode (D2) is connected to the input end of a direct-current power supply through the first resistor (R1), and the anode of the voltage-stabilizing diode is grounded;
the base electrode of the triode (T1) is connected with the first resistor (R1) through the second resistor (R2), the emitter is connected with the direct-current power supply input end, and the collector is connected with the grid electrode of the PMOS tube (Q1);
the source electrode of the PMOS tube (Q1) is connected to the input end of the direct-current power supply, the grid electrode of the PMOS tube is grounded through the resistor (R3), and the drain electrode of the PMOS tube is connected to the output end of the direct-current power supply.
2. The dc power supply electrostatic surge protection circuit of claim 1, further comprising: the negative pole of the TVS tube (D1) is connected to the input end of the direct-current power supply, and the positive pole of the TVS tube (D1) is grounded;
the TVS tube (D1) is used for preventing instantaneous impact of nanosecond and microsecond signals.
3. The dc power supply electrostatic surge protection circuit of claim 1, wherein: the starting voltage of the direct current power supply electrostatic surge protection circuit is the stable voltage V of the voltage stabilizing diode (D2)ZD2。
4. The dc power supply electrostatic surge protection circuit of claim 1, wherein: the stable voltage of the input end of the direct current power supply is Vin, and Vin is equal to VZD2+0.7V，VZD2Is the regulated voltage of the zener diode (D2).
5. The dc power supply electrostatic surge protection circuit of claim 1, wherein: the resistance value of the first resistor (R1) is in inverse proportion to the minimum stabilized current of the voltage stabilizing diode (D2).
6. The dc power supply electrostatic surge protection circuit of claim 1, further comprising: and the capacitor (C1) is connected between the source and the gate of the PMOS transistor (Q1).
7. The dc power supply electrostatic surge protection circuit of claim 1, further comprising: and the fourth resistor (R4) is connected between the source electrode and the gate electrode of the PMOS transistor (Q1).
8. A dc power supply system, comprising: the direct current power supply electrostatic surge protection circuit comprises the direct current power supply electrostatic surge protection circuit as claimed in any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021063505.XU CN213341629U (en) | 2020-06-09 | 2020-06-09 | DC power supply electrostatic surge protection circuit and power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021063505.XU CN213341629U (en) | 2020-06-09 | 2020-06-09 | DC power supply electrostatic surge protection circuit and power supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213341629U true CN213341629U (en) | 2021-06-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021063505.XU Active CN213341629U (en) | 2020-06-09 | 2020-06-09 | DC power supply electrostatic surge protection circuit and power supply system |
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| Country | Link |
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| CN (1) | CN213341629U (en) |
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- 2020-06-09 CN CN202021063505.XU patent/CN213341629U/en active Active
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