CN109066636B - Anti-surge circuit - Google Patents
Anti-surge circuit Download PDFInfo
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- CN109066636B CN109066636B CN201810924402.9A CN201810924402A CN109066636B CN 109066636 B CN109066636 B CN 109066636B CN 201810924402 A CN201810924402 A CN 201810924402A CN 109066636 B CN109066636 B CN 109066636B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
- H02H9/047—Free-wheeling circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/042—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage comprising means to limit the absorbed power or indicate damaged over-voltage protection device
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
- H02H7/1252—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to overvoltage in input or output, e.g. by load dump
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/001—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off
Abstract
The invention provides a circuit for preventing surge, comprising: the first diode, the second diode, the third diode, the fourth diode and the first piezoresistor; the anode of the first diode is connected with the anode of the fourth diode, the cathode of the first diode is connected with the anode of the second diode, the cathode of the second diode is connected with the cathode of the third diode, and the anode of the third diode is connected with the cathode of the fourth diode; the negative electrode of the first diode is connected with a zero line, and the negative electrode of the fourth diode is connected with a live line; the first end of the first piezoresistor is connected with the cathode of the fourth diode, and the second end of the first piezoresistor is connected with the anode of the fourth diode; and the anode of the fourth diode is connected with the direct current ground. The invention provides an anti-surge circuit which can improve the anti-surge effect.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a surge-proof circuit.
Background
The outdoor equipment such as the air conditioner outdoor unit is placed outside, the possibility of being struck by lightning exists, if high voltage enters the outdoor equipment such as the air conditioner outdoor unit after a power line is struck by lightning, the anti-surge capacity of the equipment is poor, and the circuit board of the equipment can be directly failed.
In prior art, prevent the surge and mainly adopt the fuse to realize, install the fuse on the live wire, when producing surge voltage, protect the circuit board through fusing the fuse, however, the fusing of fuse needs certain time, and the circuit board probably has been damaged in this time, and the effect of preventing the surge is relatively poor.
Disclosure of Invention
The embodiment of the invention provides an anti-surge circuit which can improve the anti-surge effect.
The embodiment of the invention provides a surge prevention circuit, which comprises:
the first diode, the second diode, the third diode, the fourth diode and the first piezoresistor;
the anode of the first diode is connected with the anode of the fourth diode, the cathode of the first diode is connected with the anode of the second diode, the cathode of the second diode is connected with the cathode of the third diode, and the anode of the third diode is connected with the cathode of the fourth diode;
the negative electrode of the first diode is connected with a zero line, and the negative electrode of the fourth diode is connected with a live line;
the first end of the first piezoresistor is connected with the cathode of the fourth diode, and the second end of the first piezoresistor is connected with the anode of the fourth diode;
and the anode of the fourth diode is connected with the direct current ground.
Further, the air conditioner is provided with a fan,
the circuit further comprises: a first resistor and a first capacitor;
the first end of the first resistor is connected with a protective ground, the second end of the first resistor is connected with the first end of the first capacitor, and the second end of the first capacitor is connected with a direct-current ground.
Further, the air conditioner is provided with a fan,
the circuit further comprises: a second voltage dependent resistor;
and the first end of the second piezoresistor is connected with the cathode of the first diode, and the second end of the second piezoresistor is connected with the cathode of the fourth diode.
Further, the air conditioner is provided with a fan,
the circuit further comprises: a third voltage dependent resistor;
the first end of the third voltage dependent resistor is connected with the zero line, and the second end of the third voltage dependent resistor is connected with the live line.
Further, the air conditioner is provided with a fan,
the circuit further comprises: a fourth varistor and a fifth varistor;
the first end of the fourth piezoresistor is connected with the zero line, the second end of the fourth piezoresistor is connected with the first end of the fifth piezoresistor, and the second end of the fifth piezoresistor is connected with the live wire.
Further, the air conditioner is provided with a fan,
the circuit further comprises: a gas discharge tube;
the first end of the gas discharge tube is connected with a protective ground, and the second end of the gas discharge tube is connected with the second end of the fourth piezoresistor.
Further, the air conditioner is provided with a fan,
the circuit further comprises: a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor;
the first end of the second capacitor is connected with the cathode of the first diode, and the second end of the second capacitor is connected with a protective ground;
the first end of the third capacitor is connected with the second end of the second capacitor, and the second end of the third capacitor is connected with the cathode of the fourth diode;
the first end of the fourth capacitor is connected with the cathode of the first diode, and the second end of the fourth capacitor is connected with a protective ground;
and the first end of the fifth capacitor is connected with the second end of the fourth capacitor, and the second end of the fifth capacitor is connected with the cathode of the fourth diode.
Further, the air conditioner is provided with a fan,
the circuit further comprises: a second resistor, a third resistor and a fourth resistor;
the first end of the second resistor is connected with the cathode of the first diode, the second end of the second resistor is connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the fourth resistor, and the second end of the fourth resistor is connected with the cathode of the fourth diode.
Further, the air conditioner is provided with a fan,
the circuit further comprises: relays and thermistors;
the pin of the first coil of the relay is connected with an external controller, and the pin of the second coil of the relay is connected with direct-current voltage;
a first switch pin of the relay is connected with a first end of the thermistor, and a second switch pin of the relay is connected with a second end of the thermistor;
the thermistor is connected in series with the live wire.
Further, the air conditioner is provided with a fan,
the circuit further comprises: a filter inductor;
a first end of a first side of the filter inductor is connected with the zero line, and a second end of the first side of the filter inductor is connected with a negative electrode of the first diode;
and the first end of the second side of the filter inductor is connected with the live wire, and the second end of the second side of the filter inductor is connected with the cathode of the fourth diode.
Further, the air conditioner is provided with a fan,
the circuit further comprises: a fuse;
the fuse is connected in series with the live wire.
Further, the air conditioner is provided with a fan,
the circuit further comprises: at least one filter capacitance:
and the first end of each filter capacitor is connected with the zero line, and the second end of each filter capacitor is connected with the live line.
In the embodiment of the invention, the first piezoresistor is arranged between the anode of the fourth diode and the cathode of the fourth diode, the anode of the fourth diode is connected with the direct current ground, namely, the second end of the first piezoresistor is connected with the direct current ground, when the circuit bears overvoltage, the first piezoresistor clamps the voltage and absorbs the redundant current to protect other devices on the circuit, the response of the first piezoresistor is very quick, and the anti-surge effect is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a circuit diagram of a surge protection circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of another anti-surge circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a circuit for preventing surge, including:
a first diode D1, a second diode D2, a third diode D3, a fourth diode D4 and a first piezoresistor RV 1;
the anode of the first diode D1 is connected with the anode of the fourth diode D4, the cathode of the first diode D1 is connected with the anode of the second diode D2, the cathode of the second diode D2 is connected with the cathode of the third diode D3, and the anode of the third diode D3 is connected with the cathode of the fourth diode D4;
the negative electrode of the first diode D1 is connected with a zero line, and the negative electrode of the fourth diode D4 is connected with a live line;
a first end of the first piezoresistor RV1 is connected with the cathode of the fourth diode D4, and a second end of the first piezoresistor RV1 is connected with the anode of the fourth diode D4;
the anode of the fourth diode D4 is connected to dc ground.
In the embodiment of the invention, the first piezoresistor is arranged between the anode of the fourth diode and the cathode of the fourth diode, the anode of the fourth diode is connected with the direct current ground, namely, the second end of the first piezoresistor is connected with the direct current ground, when the circuit bears overvoltage, the first piezoresistor clamps the voltage and absorbs the redundant current to protect other devices on the circuit, the response of the first piezoresistor is very quick, and the anti-surge effect is greatly improved.
In an embodiment of the present invention, the circuit further includes: a first resistor and a first capacitor;
the first end of the first resistor is connected with a protective ground, the second end of the first resistor is connected with the first end of the first capacitor, and the second end of the first capacitor is connected with a direct-current ground.
In the embodiment of the present invention, the first resistor and the first capacitor form an RC circuit, the RC circuit charges the first capacitor under the common mode surge voltage, and when the voltage of the first capacitor rises to the clamping voltage of the first varistor, the first varistor performs voltage clamping, and each diode of the rectifier bridge (the rectifier bridge formed by the first diode, the second diode, the third diode, and the fourth diode) is not broken down by the reverse voltage, so as to achieve surge prevention for the common mode surge, and improve the EMI (Electromagnetic Interference) disturbance voltage, thereby ensuring that a relatively large margin is provided for an EMC (Electromagnetic Compatibility) test.
The first resistor may be a power resistor, and the power of the first resistor is relatively large, and may be 2w, 3w, and the like.
In an embodiment of the present invention, the circuit further includes: a second voltage dependent resistor;
and the first end of the second piezoresistor is connected with the cathode of the first diode, and the second end of the second piezoresistor is connected with the cathode of the fourth diode.
In the embodiment of the invention, the second piezoresistor is connected at the front end of the rectifier bridge, and the surge prevention aiming at the differential mode surge is realized through the second piezoresistor.
In an embodiment of the present invention, the circuit further includes: a third voltage dependent resistor;
the first end of the third voltage dependent resistor is connected with the zero line, and the second end of the third voltage dependent resistor is connected with the live line.
In the embodiment of the invention, the third piezoresistor is connected at the input positions of the zero line and the live line, and the anti-surge aiming at the differential mode surge is realized through the third piezoresistor.
When the second voltage dependent resistor and the third voltage dependent resistor exist in the circuit at the same time, double-layer protection of the circuit can be realized, and the anti-surge effect is greatly improved.
In an embodiment of the present invention, the circuit further includes: a fourth varistor and a fifth varistor;
the first end of the fourth piezoresistor is connected with the zero line, the second end of the fourth piezoresistor is connected with the first end of the fifth piezoresistor, and the second end of the fifth piezoresistor is connected with the live wire.
In the embodiment of the invention, the fourth piezoresistor and the fifth piezoresistor are arranged at the input ends of the zero line and the live line, and the anti-surge effect can be further improved through the fourth piezoresistor and the fifth piezoresistor.
In an embodiment of the present invention, the circuit further includes: a gas discharge tube;
the first end of the gas discharge tube is connected with a protective ground, and the second end of the gas discharge tube is connected with the second end of the fourth piezoresistor.
In the embodiment of the invention, when the voltage at the two ends of the gas discharge tube reaches the voltage which causes the gas in the gas discharge tube to break down, the gas discharge tube starts to discharge, the high resistance is changed into the low resistance, the voltage at the two ends of the gas discharge tube does not exceed the breakdown voltage, and the surge energy is discharged through the gas discharge tube, thereby further improving the anti-surge effect.
Because gas discharge tube has the problem of time delay, when producing surge voltage, the faster first piezo-resistor of response, fourth piezo-resistor, fifth piezo-resistor can in time carry out voltage clamp, later, gas discharge tube begins to function, discharges the surge energy, and gas discharge tube cooperatees with first piezo-resistor, fourth piezo-resistor, fifth piezo-resistor, can improve the effect of anti-surge greatly.
In an embodiment of the present invention, the circuit further includes: a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor;
the first end of the second capacitor is connected with the cathode of the first diode, and the second end of the second capacitor is connected with a protective ground;
the first end of the third capacitor is connected with the second end of the second capacitor, and the second end of the third capacitor is connected with the cathode of the fourth diode;
the first end of the fourth capacitor is connected with the cathode of the first diode, and the second end of the fourth capacitor is connected with a protective ground;
and the first end of the fifth capacitor is connected with the second end of the fourth capacitor, and the second end of the fifth capacitor is connected with the cathode of the fourth diode.
In the embodiment of the invention, the EMI disturbance voltage and disturbance power in the circuit can be reduced through the second capacitor, the third capacitor, the fourth capacitor and the fifth capacitor, and the anti-interference capability of the circuit is improved.
In an embodiment of the present invention, the circuit further includes: a second resistor, a third resistor and a fourth resistor;
the first end of the second resistor is connected with the cathode of the first diode, the second end of the second resistor is connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the fourth resistor, and the second end of the fourth resistor is connected with the cathode of the fourth diode.
In the embodiment of the invention, the second resistor, the third resistor and the fourth resistor are discharge resistors after power failure, and after the circuit is powered off, electric energy in each capacitor of the circuit can be released through the second resistor, the third resistor and the fourth resistor, so that the safety of the circuit is ensured.
In an embodiment of the present invention, the circuit further includes: relays and thermistors;
the pin of the first coil of the relay is connected with an external controller, and the pin of the second coil of the relay is connected with direct-current voltage;
a first switch pin of the relay is connected with a first end of the thermistor, and a second switch pin of the relay is connected with a second end of the thermistor;
the thermistor is connected in series with the live wire.
In the embodiment of the invention, the initial state of the relay is a disconnected state, after the live wire and the zero line are electrified, the thermistor plays a role in preventing surge, the electric signal rectified by the rectifier bridge is output to the controller, the controller is electrified, the controller can normally work, when the controller sends a control signal to the first coil pin of the relay, the switch of the relay is closed, the thermistor is short-circuited, and the influence of the consumption of electric energy of the thermistor on a subsequent circuit is avoided.
The soft start function can be realized through the relay and the thermistor.
In an embodiment of the present invention, the circuit further includes: a filter inductor;
a first end of a first side of the filter inductor is connected with the zero line, and a second end of the first side of the filter inductor is connected with a negative electrode of the first diode;
and the first end of the second side of the filter inductor is connected with the live wire, and the second end of the second side of the filter inductor is connected with the cathode of the fourth diode.
In the embodiment of the invention, the filtering function can be realized through the filter inductor.
In an embodiment of the present invention, the circuit further includes: a fuse;
the fuse is connected in series with the live wire.
In the embodiment of the invention, the anti-surge effect can be further improved through the fuse.
In an embodiment of the present invention, the circuit further includes: at least one filter capacitance:
and the first end of each filter capacitor is connected with the zero line, and the second end of each filter capacitor is connected with the live line.
In the embodiment of the invention, the filtering processing of the electric signals in the circuit can be realized through each filter capacitor. Specifically, the filter circuit may include four filter capacitors, and the filter capacitors may be connected to the input of the zero line and the live line, or may be connected to the rectifier bridge end.
As shown in fig. 2, an embodiment of the present invention provides a circuit for preventing surge, including:
the circuit comprises a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first piezoresistor RV1, a second piezoresistor RV2, a third piezoresistor RV3, a fourth piezoresistor RV4, a fifth piezoresistor RV5, a thermistor RT, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first filter capacitor C6, a second filter capacitor C7, a third filter capacitor C8, a fourth filter capacitor C9, a gas discharge tube SG, a relay K, a filter inductor L and a fuse F.
The anode of the first diode D1 is connected with the anode of the fourth diode D4, the cathode of the first diode D1 is connected with the anode of the second diode D2, the cathode of the second diode D2 is connected with the cathode of the third diode D3, the anode of the third diode D3 is connected with the cathode of the fourth diode D4, and the anode of the fourth diode D4 is connected with the direct-current ground GND;
the first end of the fuse F is connected with a live wire AC _ L, and the second end of the fuse F is connected with the first end of the thermistor RT;
a first end of a first side of the filter inductor L is connected with a zero line AC _ N, and a second end of the first side of the filter inductor L is connected with a negative electrode of a first diode D1; the first end of the second side of the filter inductor L is connected with the second end of the thermistor RT, and the second end of the second side of the filter inductor L is connected with the negative electrode of a fourth diode D4;
a first coil pin of the relay K is connected with an external controller, a second coil pin of the relay K is connected with direct-current voltage, a first switch pin of the relay K is connected with a first end of the thermistor RT, a second switch pin of the relay K is connected with a second end of the thermistor RT, and the first end of the thermistor RT is connected with a second end of the fuse F;
a first end of the first piezoresistor RV1 is connected with the cathode of the fourth diode D4, and a second end of the first piezoresistor RV1 is connected with the anode of the fourth diode D4;
a first end of the first resistor R1 is connected to the protection ground PE, a second end of the first resistor R1 is connected to a first end of the first capacitor C1, and a second end of the first capacitor C1 is connected to the dc ground GND;
a first end of the second piezoresistor RV2 is connected with the cathode of the first diode D1, and a second end of the second piezoresistor RV2 is connected with the cathode of the fourth diode D4;
a first end of the third piezoresistor RV3 is connected with a neutral line AC _ N, and a second end of the third piezoresistor RV3 is connected with a second end of the fuse F;
a first end of the fourth piezoresistor RV4 is connected with a neutral line AC _ N, a second end of the fourth piezoresistor RV4 is connected with a first end of the fifth piezoresistor RV5, and a second end of the fifth piezoresistor RV5 is connected with a second end of the third piezoresistor RV 3;
the first end of the gas discharge tube SG is connected with the protective ground PE, and the second end of the gas discharge tube SG is connected with the second end of the fourth piezoresistor RV 4;
a first end of a second capacitor C2 is connected to a cathode of a first diode D1, a second end of a second capacitor C2 is connected to the protection ground PE, a first end of a third capacitor C3 is connected to a second end of the second capacitor C2, a second end of a third capacitor C3 is connected to a cathode of a fourth diode D4, a first end of a fourth capacitor C4 is connected to a cathode of the first diode D1, a second end of a fourth capacitor C4 is connected to the protection ground PE, a first end of a fifth capacitor C5 is connected to a second end of the fourth capacitor C4, and a second end of the fifth capacitor C5 is connected to a cathode of the fourth diode D4;
a first end of the second resistor R2 is connected to the cathode of the first diode D1, a second end of the second resistor R2 is connected to a first end of the third resistor R3, a second end of the third resistor R3 is connected to a first end of the fourth resistor R4, and a second end of the fourth resistor R4 is connected to the cathode of the fourth diode D4;
the first end of a first filter capacitor C6 is connected with a zero line AC _ N, the second end of a first filter capacitor C6 is connected with the second end of a fifth piezoresistor RV5, the first end of a second filter capacitor C7 is connected with the cathode of a first diode D1, the second end of a second filter capacitor C7 is connected with the cathode of a fourth diode D4, the first end of a third filter capacitor C8 is connected with the cathode of the first diode D1, the second end of a third filter capacitor C8 is connected with the cathode of a fourth diode D4, the first end of a fourth filter capacitor C9 is connected with the cathode of the first diode D1, and the second end of a fourth filter capacitor C9 is connected with the cathode of the fourth diode D4.
In the embodiment of the present invention, the first filter capacitor C6, the filter inductor L, the second filter capacitor C7, and the third filter capacitor C8 may form an EMI filter circuit.
In the embodiment of the invention, for differential mode surge, two-stage protection is carried out by adopting the second piezoresistor RV2 and the third piezoresistor RV 3. For common mode surge protection, a first piezoresistor RV1, a first capacitor C1 and a first resistor R1 are adopted.
In the embodiment of the invention, when the surge voltage passes through the third piezoresistor RV3, the third piezoresistor RV3 performs protection absorption to generate a clamping voltage, and after passing through the EMI filter circuit, the surge voltage reaches the second piezoresistor RV2 to further perform protection absorption, so that the surge voltage is limited in a bearable range, and the anti-surge effect is greatly improved through two-stage protection.
When the live wire generates surge voltage to the ground, because gas discharge tube SG has the problem of time delay, gas discharge tube SG does not play a role immediately, voltage is formed between the live wire and the positive pole of fourth diode D4 through the RC circuit that first resistance R1 and first electric capacity C1 formed, carry out voltage clamp when voltage reaches first piezo-resistor RV1 piezo-voltage, ensure that the rectifier bridge is intact, gas discharge tube SG plays a role, discharge surge energy, have no influence to rectifier bridge output positive pole, firstly the live wire does not have the backward diode problem to the rectifier output, secondly, there is almost no return circuit to the ground in the rectifier positive pole output.
When the zero line produces surge voltage to ground, because gas discharge tube SG has the problem of time delay, surge voltage from the RC circuit that first resistance R1 and first electric capacity C1 formed to first piezo-resistor RV1, then get back to the zero line, owing to there is the protection of first piezo-resistor RV1, the arrangement bridge can not be damaged, and gas discharge tube SG plays a role afterwards, discharges surge energy.
In the embodiment of the present invention, each of the piezoresistors can be a piezoresistor with a piezoresistor voltage of 561K Ω and a piezoresistor voltage of 560 v. The voltage-dependent voltages can also be 620v, 680v and the like, and are selected according to requirements.
In the embodiment of the present invention, each capacitor may be a capacitor of 0.01uF or less.
The embodiment of the invention provides an anti-surge circuit which can improve the anti-surge capacity to 2KV of phase-to-phase differential mode and 4KV of phase-to-ground common mode, and achieves the test level of 4.
The anti-surge circuit provided by the embodiment of the invention has good anti-surge effect and low realization cost.
The embodiment of the invention can greatly improve the anti-surge effect, greatly enhance the lightning protection capability and improve the reliability of products under the condition of low cost.
The anti-surge circuit provided by the embodiment of the invention is suitable for equipment such as a variable frequency air conditioner.
The embodiments of the invention have at least the following beneficial effects:
1. in the embodiment of the invention, the first piezoresistor is arranged between the anode of the fourth diode and the cathode of the fourth diode, the anode of the fourth diode is connected with the direct current ground, namely, the second end of the first piezoresistor is connected with the direct current ground, when the circuit bears overvoltage, the first piezoresistor clamps the voltage and absorbs the redundant current to protect other devices on the circuit, the response of the first piezoresistor is very quick, and the anti-surge effect is greatly improved.
2. In the embodiment of the invention, because the gas discharge tube has the problem of time delay, when surge voltage is generated, the first voltage dependent resistor, the fourth voltage dependent resistor and the fifth voltage dependent resistor which have faster response can be used for voltage clamping in time, then the gas discharge tube starts to function to discharge surge energy, and the gas discharge tube is matched with the first voltage dependent resistor, the fourth voltage dependent resistor and the fifth voltage dependent resistor, so that the anti-surge effect can be greatly improved.
3. In the embodiment of the invention, the second piezoresistor and the third piezoresistor exist in the circuit at the same time, the first-stage anti-surge protection is realized through the third piezoresistor, the second-stage anti-surge protection is realized through the second piezoresistor, and the two-stage anti-surge protection is realized through the second piezoresistor and the third piezoresistor, so that the anti-surge effect is greatly improved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other similar elements in a process, method, article, or apparatus that comprises the element.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it is to be noted that: the above description is only a preferred embodiment of the present invention, and is only used to illustrate the technical solutions of the present invention, and not to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (9)
1. An anti-surge circuit, comprising:
the first diode, the second diode, the third diode, the fourth diode and the first piezoresistor;
the anode of the first diode is connected with the anode of the fourth diode, the cathode of the first diode is connected with the anode of the second diode, the cathode of the second diode is connected with the cathode of the third diode, and the anode of the third diode is connected with the cathode of the fourth diode;
the negative electrode of the first diode is connected with a zero line, and the negative electrode of the fourth diode is connected with a live line;
the first end of the first piezoresistor is connected with the cathode of the fourth diode, and the second end of the first piezoresistor is connected with the anode of the fourth diode;
the anode of the fourth diode is connected with the direct current ground;
further comprising: a first resistor and a first capacitor;
the first end of the first resistor is connected with a protective ground, the second end of the first resistor is connected with the first end of the first capacitor, and the second end of the first capacitor is connected with a direct-current ground.
2. The circuit of claim 1,
further comprising: a second voltage dependent resistor;
and the first end of the second piezoresistor is connected with the cathode of the first diode, and the second end of the second piezoresistor is connected with the cathode of the fourth diode.
3. The circuit of claim 1,
further comprising: a third voltage dependent resistor;
the first end of the third voltage dependent resistor is connected with the zero line, and the second end of the third voltage dependent resistor is connected with the live line.
4. The circuit of claim 1,
further comprising: a fourth varistor and a fifth varistor;
the first end of the fourth piezoresistor is connected with the zero line, the second end of the fourth piezoresistor is connected with the first end of the fifth piezoresistor, and the second end of the fifth piezoresistor is connected with the live wire.
5. The circuit of claim 4,
further comprising: a gas discharge tube;
the first end of the gas discharge tube is connected with a protective ground, and the second end of the gas discharge tube is connected with the second end of the fourth piezoresistor.
6. The circuit of claim 1,
further comprising: a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor;
the first end of the second capacitor is connected with the cathode of the first diode, and the second end of the second capacitor is connected with a protective ground;
the first end of the third capacitor is connected with the second end of the second capacitor, and the second end of the third capacitor is connected with the cathode of the fourth diode;
the first end of the fourth capacitor is connected with the cathode of the first diode, and the second end of the fourth capacitor is connected with a protective ground;
and the first end of the fifth capacitor is connected with the second end of the fourth capacitor, and the second end of the fifth capacitor is connected with the cathode of the fourth diode.
7. The circuit of claim 1,
further comprising: a second resistor, a third resistor and a fourth resistor;
the first end of the second resistor is connected with the cathode of the first diode, the second end of the second resistor is connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the fourth resistor, and the second end of the fourth resistor is connected with the cathode of the fourth diode.
8. The circuit of claim 1,
further comprising: relays and thermistors;
the pin of the first coil of the relay is connected with an external controller, and the pin of the second coil of the relay is connected with direct-current voltage;
a first switch pin of the relay is connected with a first end of the thermistor, and a second switch pin of the relay is connected with a second end of the thermistor;
the thermistor is connected in series with the live wire.
9. The circuit according to any of claims 1-8,
further comprising: a filter inductor;
a first end of a first side of the filter inductor is connected with the zero line, and a second end of the first side of the filter inductor is connected with a negative electrode of the first diode;
the first end of the second side of the filter inductor is connected with the live wire, and the second end of the second side of the filter inductor is connected with the negative electrode of the fourth diode;
and/or the presence of a gas in the gas,
further comprising: a fuse;
the fuse is connected in series with the live wire;
and/or the presence of a gas in the gas,
further comprising: at least one filter capacitance:
and the first end of each filter capacitor is connected with the zero line, and the second end of each filter capacitor is connected with the live line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810924402.9A CN109066636B (en) | 2018-08-14 | 2018-08-14 | Anti-surge circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810924402.9A CN109066636B (en) | 2018-08-14 | 2018-08-14 | Anti-surge circuit |
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| Publication Number | Publication Date |
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| CN109066636A CN109066636A (en) | 2018-12-21 |
| CN109066636B true CN109066636B (en) | 2020-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810924402.9A Active CN109066636B (en) | 2018-08-14 | 2018-08-14 | Anti-surge circuit |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110247543A (en) * | 2019-06-21 | 2019-09-17 | 秦皇岛尼特智能科技有限公司 | A kind of circuit for reinforcing conduction interference immunity to interference in fire-fighting bus |
| CN113078025B (en) * | 2021-03-19 | 2022-04-29 | 苏州贝昂科技有限公司 | Gear switching circuit |
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| CN102185698A (en) * | 2011-04-11 | 2011-09-14 | 成都市华为赛门铁克科技有限公司 | Ethernet power supply port protective circuit and ethernet power supply equipment |
| CN201985520U (en) * | 2011-02-01 | 2011-09-21 | 中兴通讯股份有限公司 | Alternating current line lightning protection device |
| CN206164354U (en) * | 2016-10-19 | 2017-05-10 | 东莞市乐丰电器科技有限公司 | Power lightning protection circuit and power adapter |
| CN207039181U (en) * | 2017-05-10 | 2018-02-23 | 深圳欧陆通电子有限公司 | A kind of anti-lightning strike potential circuit, driving power and terminal |
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2018
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201985520U (en) * | 2011-02-01 | 2011-09-21 | 中兴通讯股份有限公司 | Alternating current line lightning protection device |
| CN102185698A (en) * | 2011-04-11 | 2011-09-14 | 成都市华为赛门铁克科技有限公司 | Ethernet power supply port protective circuit and ethernet power supply equipment |
| CN206164354U (en) * | 2016-10-19 | 2017-05-10 | 东莞市乐丰电器科技有限公司 | Power lightning protection circuit and power adapter |
| CN207039181U (en) * | 2017-05-10 | 2018-02-23 | 深圳欧陆通电子有限公司 | A kind of anti-lightning strike potential circuit, driving power and terminal |
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|---|---|
| CN109066636A (en) | 2018-12-21 |
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