CN211239326U - Anti-surge protection circuit with double fuses - Google Patents
Anti-surge protection circuit with double fuses Download PDFInfo
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- CN211239326U CN211239326U CN202020154079.4U CN202020154079U CN211239326U CN 211239326 U CN211239326 U CN 211239326U CN 202020154079 U CN202020154079 U CN 202020154079U CN 211239326 U CN211239326 U CN 211239326U
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Abstract
The utility model discloses an anti-surge protection circuit with double fuses in a switching power supply, which comprises an input filtering unit, a fuse F1, a fuse F2, a voltage dependent resistor MOV1, a thermistor NTC1 and a common mode inductor LF1, wherein the fuse F1 is connected at the input L end of an alternating current power supply, and the fuse F2 is connected at the input N end of the alternating current power supply; the piezoresistor MOV1 is connected with the tail end of the fuse F1 and the tail end of the fuse F2; the utility model has the advantages that: the utility model provides a power adapter owing to adopted the dual fuse framework to greatly improved power adapter's safety in utilization, practicality. The lightning stroke resistance of the product can be improved by arranging two fuses, namely one large fuse and one small fuse, a good protection effect is achieved on a follow-up circuit, and the safety, the practicability and the cost are all great advantages.
Description
Technical Field
The utility model relates to a power technical field especially relates to an anti-surge protection circuit, especially takes anti-surge protection circuit of dual fail fuse.
Background
The existing power adapter generally comprises an input filtering unit, a rectifying and smoothing unit, a PWM (pulse width modulation) control unit, a rectifying and filtering unit and a feedback control unit, wherein an anti-lightning circuit is arranged on the input filtering unit.
Most of the existing lightning-resistant circuits adopt a single fuse, and the lightning-resistant circuit has very high specification of fusing current of the selected fuse due to very high current flowing through a lightning stroke loop, so that the lightning-resistant problem is solved, the protection effect cannot be realized when a rear-stage circuit is abnormal, and the consistency of the surge-resistant capability of the product is poor.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an it is single fuse that anti thunderbolt circuit that solves prior art adopts mostly, because the electric current that the thunderbolt return circuit flows through is very big, so the fuse fusing electric current specification of chooseing for use is all very high, though solved anti thunderbolt problem like this, nevertheless can not play the guard action when the latter circuit appears unusually, the problem that the anti surge ability uniformity of product is poor provides the anti surge protection circuit who takes double fuse, satisfies people to the demand of this type of product.
In order to achieve the purpose, the utility model adopts the following technical proposal: designing and manufacturing an anti-surge protection circuit with a double fuse, wherein the anti-surge protection circuit comprises:
the input filtering unit comprises fuses F1 and F2, a voltage dependent resistor MOV1, a thermistor NTC1 and a common mode inductor LF1, and is used for inhibiting interference signals in an input alternating current power supply and then outputting the interference signals to the rectification smoothing unit; the fuse F1 is connected to the L end of the AC power input, and the fuse F2 is connected to the N end of the AC power input; the piezoresistor MOV1 is connected with the tail end of the fuse F1 and the tail end of the fuse F2;
the rectifying smoothing unit comprises a rectifier bridge BD1, a leakage inductance absorption circuit which is connected with the output end of the rectifier bridge through the input end of the smoothing capacitor C1 and C2, the capacitor C3, the resistor R5, the resistor R6, the resistor R7 and the diode D5, and is used for converting input alternating current voltage into smooth direct current voltage and outputting the smooth direct current voltage to the PWM control unit; the resistor R5 is connected with the cathode of the diode D5 in parallel with the capacitor C3;
the PWM control unit comprises a PWM controller IC1, a diode D6, a resistor R3, a resistor R4, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R16, a resistor RS1, a resistor RS2, capacitors C6, C6A and C13; the 5 th PIN of the PWM controller U1 is connected with starting resistors R3, R4 and R13 to provide starting voltage for the IC, the positive end of an auxiliary coil T1B of the transformer is connected with the 3 rd PIN of the PWM controller IC1 through R8, D6, R12, capacitors C6 and C6A, the negative end of the auxiliary coil T1B is directly grounded, a PIN6 of the IC1 drives Q1 through R9, and PIN4 is used as overcurrent detection input,
the rectifying and filtering unit comprises transformers T1C, D8, a filtering capacitor C8 and a filtering inductor LF 2; the direct current voltage rectifier is used for converting the pulsating direct current voltage, rectifying and filtering the pulsating direct current voltage and outputting the rectified direct current voltage to a load; the secondary winding of the T1C is rectified by the D8, and the DC voltage is provided for a load after the filtering of the C8; the resistor R15 is connected with the capacitor C11 in series and then connected to two ends of the D8 in parallel;
the feedback control unit is composed of an optical coupler IC2, a voltage reference IC3, a capacitor C12 and resistors R21, R20, R19, R14, R17 and R18; the resistor R19 and the resistor R18 are used for acquiring the change of an output voltage signal of the rectifying and filtering unit, determining a voltage reference value, and the resistor R14 is connected with an output voltage V + end and determining the current flowing through the IC 2A.
The fuse F1 blows a current of 6.3A.
The fuse F12 blows current 2A.
In the feedback control unit, the optocoupler IC2A is connected with the IC3 in series, the optocoupler IC2B is connected to the 2 nd pin of the IC1, the optocoupler IC2A is connected with the negative end of the rectifier diode D8 through a resistor R14, and the other end of the IC3 is grounded; the control terminal of the IC3 is connected to one terminal of the filter inductor LF2A through a resistor R19.
The IC1 is selected from the AP8268 model and a compatible model.
The utility model has the advantages that: the utility model provides a power adapter is owing to adopted the dual fuse framework to greatly improved power adapter's safety in utilization, the practicality, the setting of one big or little two fuses can improve the anti thunderbolt ability of product, plays fine guard action to follow-up circuit again, at the security, the practicality all has huge advantage in the cost.
Drawings
Fig. 1 is a schematic diagram of an arrangement of two fuses, one large and one small, according to the anti-surge protection circuit with a dual fuse of the present invention.
Detailed Description
The technical solution of the present invention will be further explained by the best mode in the following with reference to the accompanying drawings.
As shown in fig. 1, the anti-surge protection circuit with dual fuses includes an input filter unit, which includes fuses F1 and F2, a voltage dependent resistor MOV1, a thermistor NTC1, and a common mode inductor LF1, and is configured to suppress an interference signal in an input ac power supply and output the signal to a smoothing rectifier unit; the fuse F1 is connected to the L end of the AC power input, and the fuse F2 is connected to the N end of the AC power input; the piezoresistor MOV1 is connected with the tail end of the fuse F1 and the tail end of the fuse F2;
the rectifying smoothing unit comprises a rectifier bridge BD1, a leakage inductance absorption circuit which is connected with the output end of the rectifier bridge through the input end of the smoothing capacitor C1 and C2, the capacitor C3, the resistor R5, the resistor R6, the resistor R7 and the diode D5, and is used for converting input alternating current voltage into smooth direct current voltage and outputting the smooth direct current voltage to the PWM control unit; the resistor R5 is connected with the cathode of the diode D5 in parallel with the capacitor C3;
the PWM control unit comprises a PWM controller IC1, a diode D6, a resistor R3, a resistor R4, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R16, a resistor RS1, a resistor RS2, capacitors C6, C6A and C13; a PIN 5 of the PWM controller U1 is connected with starting resistors R3, R4 and R13 to provide starting voltage for an IC, the positive end of an auxiliary coil T1B of the transformer is connected with a PIN 3 of the PWM controller IC1 through R8, D6, R12, capacitors C6 and C6A, the negative end of the auxiliary coil T1B is directly grounded, a PIN6 of the IC1 drives Q1 through R9, and PIN4 is used as overcurrent detection input;
the rectifying and filtering unit comprises transformers T1C, D8, a filtering capacitor C8 and a filtering inductor LF 2; the direct current voltage rectifier is used for converting the pulsating direct current voltage, rectifying and filtering the pulsating direct current voltage and outputting the rectified direct current voltage to a load; the secondary winding of the T1C is rectified by the D8, and the DC voltage is provided for a load after the filtering of the C8; the resistor R15 is connected with the capacitor C11 in series and then connected to two ends of the D8 in parallel;
the feedback control unit is composed of an optical coupler IC2, a voltage reference IC3, a capacitor C12 and resistors R21, R20, R19, R14, R17 and R18; the resistor R19 and the resistor R18 are used for acquiring the change of an output voltage signal of the rectifying and filtering unit, determining a voltage reference value, and the resistor R14 is connected with an output voltage V + end and determining the current flowing through the IC 2A.
The fuse F1 blows a current of 6.3A.
Fuse F12 blows current 2A.
The feedback control unit is characterized in that an optical coupler IC2A is connected with an IC3 in series, an optical coupler IC2B is connected to the No. 2 pin of an IC1, the optical coupler IC2A is connected to the negative end of a rectifier diode D8 through a resistor R14, and the other end of the IC3 is grounded; the control terminal of the IC3 is connected to one terminal of the filter inductor LF2A through a resistor R19.
IC3 is typically TL 431.
The IC1 is selected from AP8268 model, BM1P107FJ, which is 8-pin IC with functions similar to AP8268 model. There are many more ICs of similar model to AP8268, not to mention here.
The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there may be variations in the specific implementation and application range according to the spirit of the present invention, and the content of the description should not be construed as a limitation to the present invention.
Claims (5)
1. An anti-surge protection circuit with a dual fuse, the protection circuit comprising:
the input filtering unit comprises fuses F1 and F2, a voltage dependent resistor MOV1, a thermistor NTC1 and a common mode inductor LF1, and is used for inhibiting interference signals in an input alternating current power supply and then outputting the interference signals to the rectification smoothing unit; the fuse F1 is connected to the L end of the AC power input, and the fuse F2 is connected to the N end of the AC power input; the piezoresistor MOV1 is connected with the tail end of the fuse F1 and the tail end of the fuse F2;
the rectifying smoothing unit comprises a rectifier bridge BD1, a leakage inductance absorption circuit which is connected with the output end of the rectifier bridge through the input end of the smoothing capacitor C1 and C2, the capacitor C3, the resistor R5, the resistor R6, the resistor R7 and the diode D5, and is used for converting input alternating current voltage into smooth direct current voltage and outputting the smooth direct current voltage to the PWM control unit; the resistor R5 is connected with the cathode of the diode D5 in parallel with the capacitor C3;
the PWM control unit comprises a PWM controller IC1, a diode D6, a resistor R3, a resistor R4, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R16, a resistor RS1, a resistor RS2, capacitors C6, C6A and C13; the 5 th PIN of the PWM controller U1 is connected with starting resistors R3, R4 and R13 to provide starting voltage for the IC, the positive end of an auxiliary coil T1B of the transformer is connected with the 3 rd PIN of the PWM controller IC1 through R8, D6, R12, capacitors C6 and C6A, the negative end of the auxiliary coil T1B is directly grounded, a PIN6 of the IC1 drives Q1 through R9, and PIN4 is used as overcurrent detection input,
the rectifying and filtering unit comprises transformers T1C, D8, a filtering capacitor C8 and a filtering inductor LF 2; the direct current voltage rectifier is used for converting the pulsating direct current voltage, rectifying and filtering the pulsating direct current voltage and outputting the rectified direct current voltage to a load; the secondary winding of the T1C is rectified by the D8, and the DC voltage is provided for a load after the filtering of the C8; the resistor R15 is connected with the capacitor C11 in series and then connected to two ends of the D8 in parallel;
the feedback control unit is composed of an optical coupler IC2, a voltage reference IC3, a capacitor C12 and resistors R21, R20, R19, R14, R17 and R18; the resistor R19 and the resistor R18 are used for acquiring the change of an output voltage signal of the rectifying and filtering unit, determining a voltage reference value, and the resistor R14 is connected with an output voltage V + end and determining the current flowing through the IC 2A.
2. The anti-surge protection circuit with double fuse according to claim 1, wherein said fuse F1 blows current 6.3A.
3. The anti-surge protection circuit with double fuse according to claim 1, wherein said fuse F12 blows current 2A.
4. The anti-surge protection circuit with the double fuse according to claim 1, wherein the feedback control unit, the optical coupler IC2A is connected in series with the IC3, the optical coupler IC2B is connected to the 2 nd pin of the IC1, the optical coupler IC2a is connected to the negative terminal of the rectifier diode D8 through a resistor R14, and the other terminal of the IC3 is grounded; the control terminal of the IC3 is connected to one terminal of the filter inductor LF2A through a resistor R19.
5. The anti-surge protection circuit with double fuses of claim 1, wherein the IC1 is an AP8268 type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202020154079.4U CN211239326U (en) | 2020-02-06 | 2020-02-06 | Anti-surge protection circuit with double fuses |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020154079.4U CN211239326U (en) | 2020-02-06 | 2020-02-06 | Anti-surge protection circuit with double fuses |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115333070A (en) * | 2022-10-12 | 2022-11-11 | 广东东菱电源科技有限公司 | Lightning surge protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115333070A (en) * | 2022-10-12 | 2022-11-11 | 广东东菱电源科技有限公司 | Lightning surge protection circuit |
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