CN111864708A - Surge-proof circuit for power supply protection - Google Patents
Surge-proof circuit for power supply protection Download PDFInfo
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- CN111864708A CN111864708A CN202010663533.3A CN202010663533A CN111864708A CN 111864708 A CN111864708 A CN 111864708A CN 202010663533 A CN202010663533 A CN 202010663533A CN 111864708 A CN111864708 A CN 111864708A
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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
- H02H9/005—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection avoiding undesired transient conditions
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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
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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
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
Abstract
The invention relates to the technical field of surge protection, and discloses an anti-surge circuit for power supply protection, which is connected in parallel with a power supply input end of a protected circuit and comprises a surge suppression circuit and a voltage stabilizing circuit, wherein the surge suppression circuit comprises a clamping element and a switching element, the voltage stabilizing circuit comprises a first voltage stabilizing circuit and a second voltage stabilizing circuit, one end of the clamping element is electrically connected with one wiring end of the protected circuit, the other end of the clamping element is electrically connected with one end of the switching element, the other end of the switching element is electrically connected with the other wiring end of the protected circuit, two ends of the clamping element are connected in parallel with the first voltage stabilizing circuit, and two ends of the switching element are connected in. The invention improves the effect of surge protection line protection.
Description
Technical Field
The invention relates to the technical field of surge protection, in particular to an anti-surge circuit for power supply protection.
Background
The surge mainly refers to a strong pulse generated in a power supply at one moment, and because the peak voltage of the surge is possibly far higher than the rated working voltage of the power supply, the surge can cause a circuit to be burnt out at one moment of the surge, such as PN junction capacitor breakdown, resistance burning-out and the like. In order to avoid the damage of electronic circuits from surges, a surge protector is needed to be added for protection, the surge protector is generally composed of a plurality of discharge units, for example, in a circuit for preventing lightning of a power supply, a multistage protection circuit and an auxiliary protection circuit for enhancing the protection effect are needed.
The design of a surge protection circuit requires consideration of two main parameters: firstly, the voltage is not operated, and the voltage is larger than the normal operating voltage of the equipment; protection voltage, that is, the residual voltage that is let through after absorbing the surge, should be less than the maximum pulse voltage that can be borne by the protected circuit or element. The higher the non-operating voltage is, the better the reliability of the surge protection circuit is; the lower the protection voltage, the better the protection effect on the back-end circuit or element. Therefore, the ideal surge protection circuit needs to have both high no-operation voltage and low protection voltage, but the no-operation voltage and the protection voltage are forward-related, so that it is particularly significant to design a circuit which can satisfy both the requirement of having a sufficiently high no-operation voltage and having a low protection voltage. With the development of miniaturization of the electronic complete machine at present, miniaturization requirements are also put forward for internal electronic elements, which leads to that the miniaturized electronic elements are more and more sensitive to pulse interference in a circuit, thereby also putting forward higher requirements for high reliability and accurate protection effect of surge protection circuit design.
Disclosure of Invention
In view of the shortcomings of the prior art, it is an object of the present invention to provide an anti-surge circuit for power protection.
The above object of the present invention is achieved by the following technical solutions:
the utility model provides an anti-surge circuit for power protection, connects in parallel at the power input end by protection circuit, includes surge suppression circuit and voltage stabilizing circuit, surge suppression circuit includes clamping element and switching element, voltage stabilizing circuit includes first voltage stabilizing circuit and second voltage stabilizing circuit, the one end electricity of clamping element is connected by a wiring end of protection circuit, the other end electricity of clamping element is connected switching element's one end, switching element's the other end electricity is connected by another wiring end of protection circuit, clamping element's both ends are parallelly connected first voltage stabilizing circuit, switching element's both ends are parallelly connected the second voltage stabilizing circuit.
By adopting the technical scheme, the inactive voltage of the surge suppression circuit is equal to the superposition of the inactive voltages of the clamping element and the switching element, so the value of the inactive voltage is greatly improved, and meanwhile, when a surge occurs, because of the negative resistance characteristic of the switching element, the voltage at two ends is as low as several volts after the switching element is switched on, the residual voltage is mainly provided by the clamping voltage, compared with the clamping element with the same inactive voltage, the protection voltage is greatly reduced, so that the accurate protection of a rear-stage circuit or an element is realized; in addition, due to the existence of the clamping element, the problem of follow current after the switching element is conducted can be effectively avoided; the voltage stabilizing circuit can realize voltage distribution of the clamping element and the switching element, and avoid uneven voltage division of the clamping element and the switching element or false triggering of the switching element caused by line interference, thereby ensuring that the surge suppression circuit keeps stable non-operating voltage and improving the stability of long-term operation of the surge suppression circuit.
Preferably: the clamping element is set to MOV or TVS.
By adopting the technical scheme, the MOV voltage dependent resistor is a voltage-limiting protection device, and by utilizing the nonlinear characteristic of the voltage dependent resistor, when overvoltage appears between two poles of the voltage dependent resistor, the voltage dependent resistor can clamp the voltage to a relatively low voltage value, so that the protection of a rear-stage circuit is realized; under the specified reverse application condition, when bearing a high-energy transient overvoltage pulse, the working impedance of the TVS can be immediately reduced to a very low conduction value, so that a large current is allowed to pass through, and the voltage is clamped to a design level, thereby effectively protecting precise components in an electronic circuit from being damaged; and, the clamping voltage value of MOV or TVS is designed to be greater than the normal operating voltage of the power supply, and the damage of the power supply voltage to the surge suppression circuit after the clamping element is conducted is avoided.
Preferably: the switching elements are arranged as GDTs, TSS, thyristors, glass gas discharge tubes or discharge gaps.
By adopting the technical scheme, the GDT is a ceramic gas discharge tube for short, is a lightning protection component, is often used for protecting telecommunication equipment sensitive to voltage, and prevents lightning and damage caused by transient surge voltage generated during the switching action of the equipment; when the GDT is not conducted, the GDT is a high-impedance element which is arranged in front of the protected equipment and is connected with the equipment in parallel; when overvoltage surge occurs, the GDT is switched on and is switched to a low impedance state, and a path is provided for the discharge of surge energy; the TSS semiconductor discharge tube and the thyristor are both switched on and discharged by triggering a device through breakdown current of a PN junction, and are in a low-resistance state after being switched on, so that large surge current or pulse current can flow; after the surge pulse passes, the device is turned off and is restored to an open circuit state; the glass gas discharge tube is also an overvoltage protection device and consists of two electrodes which are encapsulated in a glass tube filled with inert gas and are separated by a certain distance; when the voltage at two ends is lower than the discharge voltage, the glass gas discharge tube is in a high-resistance open circuit state; when the voltage at the two ends of the gas sensor rises to be larger than the discharge voltage, arc discharge is generated, the gas is converted from high impedance to low impedance after ionization discharge, and the voltage at the two ends of the gas sensor is rapidly reduced, so that surge current is discharged to protect equipment; the discharge gap is also called as a protection gap, and generally consists of two metal rods which are exposed in the air and are separated by a certain gap, wherein one metal rod is connected with a power phase line or a zero line of equipment to be protected, and the other metal rod is connected with a grounding wire; by utilizing the negative resistance characteristic of the switching element, the non-operating voltage of the surge suppression circuit can be effectively improved, the protection voltage of the surge suppression circuit can be reduced, and the stability, reliability and protection effect of the surge suppression circuit can be improved; by utilizing the characteristic that the leakage current of the switching element is extremely low, the loss attenuation of the protection circuit is extremely low when the power supply works normally, and the stability and the reliability of the long-term work of the surge suppression circuit are further enhanced.
Preferably: the first voltage stabilizing circuit is set to be a resistor R, a capacitor C, an inductor L or a diode D, or set to be a combination mode of any two, three or four of the above.
By adopting the technical scheme, the first voltage stabilizing circuit can be set to be a single component with impedance, such as: the resistor R, the capacitor C, the inductor L, or the diode D may also be provided as two components having impedances, such as: resistor R and capacitor C, resistor R and inductor L, resistor R and diode D; three components with impedance can also be provided, such as: a resistor R and a capacitor C and an inductor L, a capacitor C and an inductor L and a diode D; combinations of four components with impedances may also be provided, such as: a resistor R and a capacitor C and an inductor L and a diode D.
Preferably: the second voltage stabilizing circuit is set to be a resistor R, a capacitor C, an inductor L or a diode D, or set to be a combination mode of any two, three or four of the above.
By adopting the technical scheme, the second voltage stabilizing circuit can be set to be a single component with impedance, such as: the resistor R, the capacitor C, the inductor L, or the diode D may also be provided as two components having impedances, such as: resistor R and capacitor C, resistor R and inductor L, resistor R and diode D; three components with impedance can also be provided, such as: a resistor R and a capacitor C and an inductor L, a capacitor C and an inductor L and a diode D; combinations of four components with impedances may also be provided, such as: a resistor R and a capacitor C and an inductor L and a diode D.
Preferably: the diode D is arranged as a zener diode or a transient suppression diode TVS.
By adopting the technical scheme, the voltage at two ends of the device can be accurately controlled by utilizing the reverse clamping characteristic of the TVS, so that the voltage stabilizing effect is realized.
Preferably: at least one of the resistor R, the capacitor C, the inductor L or the diode D is arranged.
By adopting the technical scheme, the combination mode of components in the first voltage stabilizing circuit or the second voltage stabilizing circuit is added by the plurality of resistors R, the capacitor C, the inductor L or the diode D, so that the voltage stabilizing circuit matched with a specific circuit is designed according to the characteristics of complex parasitic capacitance and inductance in different circuits, and the main protection circuit can be widely adapted to the electrical environments of various protected circuits.
Preferably: the electric connection mode of the components in any combination mode of the resistor R, the capacitor C, the inductor L or the diode D is set to be in series connection or parallel connection.
By adopting the technical scheme, the voltage stabilizing circuit can realize accurate distribution of the voltage on the clamping element and the switching element, so that the surge suppression circuit can work normally reliably for a long time; the serial or parallel connection mode is more beneficial to the combination diversity of the first voltage stabilizing circuit and the second voltage stabilizing circuit, so that the main protection circuit can be more widely suitable for the electrical environments of various protected circuits.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the surge voltage is suppressed to a relatively low voltage value, the protection circuit can be effectively used for protecting a rear-stage circuit from being damaged by surge, and because the numerical value of the non-operating voltage is improved, the probability of misoperation of a protection circuit is effectively avoided, and the protection safety and reliability are improved; the first voltage stabilizing circuit and the second voltage stabilizing circuit realize voltage distribution on the clamping element and the switching element, and when the circuit is in a normal working state, the first voltage stabilizing circuit and the second voltage stabilizing circuit improve the reliability and the stability of a main protection circuit and also reduce the damage of surge current to the protection circuit and rear-stage protected equipment, so that the circuit can work normally reliably for a long time;
the MOV piezoresistor or the transient suppression diode TVS can clamp the voltage to a lower level, so that precision components in an electronic circuit are effectively protected from being damaged, and meanwhile, the damage of a subsequent circuit and self caused by follow current of a switching element is avoided;
3. the ceramic gas discharge tube GDT, the semiconductor discharge tube TSS, the thyristor, the glass gas discharge tube and the discharge gap can play a role in increasing the non-operating voltage, and the leakage current is extremely low, so that the aging attenuation of the protection circuit is greatly reduced, and the reliability and the service life of the whole protection circuit are increased.
Drawings
FIG. 1 is a circuit model diagram according to a first embodiment of the present application;
FIG. 2 is a circuit diagram of a first embodiment of the present application;
FIG. 3 is a circuit diagram of a second embodiment of the present application;
FIG. 4 is a circuit diagram of a third embodiment of the present application;
FIG. 5 is a circuit diagram of a fourth embodiment of the present application;
FIG. 6 is a circuit diagram of a fifth embodiment of the present application;
fig. 7 is a circuit diagram of a sixth embodiment of the present application.
Reference numerals: 1. a surge suppression circuit; 11. a clamping element; 12. a switching element; 2. a voltage stabilizing circuit; 21. a first voltage stabilizing circuit; 22. and the second voltage stabilizing circuit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The first embodiment is as follows:
referring to fig. 1, the surge protection circuit for power protection disclosed by the invention is connected in parallel to a power input end of a protected circuit, and comprises a surge suppression circuit 1 and a voltage stabilizing circuit 2 which are electrically connected. The surge suppressing circuit 1 includes a clamping element 11 and a switching element 12, one end of the clamping element 11 is electrically connected to one terminal of the protected circuit, the other end of the clamping element 11 is electrically connected to one end of the switching element 12, and the other end of the switching element 12 is electrically connected to the other terminal of the protected circuit. The regulator circuit 2 includes a first regulator circuit 21 connected in parallel to both ends of the clamp element 11 and a second regulator circuit 22 connected in parallel to both ends of the switching element 12.
Referring to fig. 2, the first stabilizing circuit 21 includes a capacitor C and a diode D connected in series, wherein the diode D is provided as a zener diode or a transient suppression diode TVS. The second stabilizing circuit 22 comprises a capacitor C and a diode D in series, wherein the diode D may also be arranged as a zener diode or a transient suppression diode TVS. Among them, the capacitor C and the diode D may be provided in plurality to increase the stability of the circuit.
The clamping element 11 is set to MOV or TVS. The switching element 12 is arranged as a GDT, TSS, thyristor, glass gas discharge tube or discharge gap.
Among them, the clamp element 11 is provided as an MOV utilizing the nonlinear characteristic of the varistor. When an overvoltage surge occurs, the voltage dependent resistor can clamp the overvoltage occurring between the two electrodes to a relatively low voltage value, thereby protecting the subsequent circuit. The clamping element 11 can also be set as TVS, which is a short for transient suppression diode, and under the specified reverse application condition, when the TVS is subjected to a high-energy transient overvoltage pulse, the working impedance thereof can be immediately reduced to a very low conduction value, allowing a large current to pass through, and clamping the voltage to a designed level, thereby effectively protecting the precise components in the electronic circuit from being damaged.
The switching element 12 is a GDT, which is also called a ceramic gas discharge tube, and is a lightning protection discharge tube, and is often used to protect telecommunication equipment sensitive to voltage, and is beneficial to preventing lightning and damage caused by transient surge voltage generated during switching of the equipment. When overvoltage surge occurs, the GDT is conducted from a high-resistance state to a low-impedance state, and a path is provided for surge energy discharge. The switch element 12 can also be set as a TSS or a thyristor, the working principle of the TSS is similar to that of a thyristor, the breakdown current of the PN junction triggers the device to conduct and discharge, and the device is in a low-resistance state after being conducted, so that a large surge current or pulse current can flow. And after the surge pulse passes, the device is turned off and is restored to an open circuit state. The switching element 12 can also be provided as a glass gas discharge tube, which is also an overvoltage protection device, consisting of two electrodes at a distance enclosed in a glass tube filled with inert gas. When the voltage at two ends is lower than the discharge voltage, the glass gas discharge tube is in a high-resistance turn-off state, when the voltage at two ends is increased to be higher than the discharge voltage, arc discharge is generated, the voltage at two ends is rapidly reduced by converting the high resistance into low resistance after gas ionization discharge, and therefore surge current is discharged to protect equipment. The switching element 12 may also be arranged as a discharge gap, typically consisting of two metal rods exposed to the air with a certain gap therebetween, one of which is connected to the power phase or neutral line of the device to be protected and the other of which is connected to the ground line. When the transient overvoltage is attacked, the gap is broken down, and the surge damage on the protected equipment is avoided.
The implementation principle of the embodiment is as follows: the clamping element 11, MOV or TVS clamps the voltage to a relatively low voltage level, thereby effectively protecting delicate components in the electronic circuit from damage. Moreover, the clamping voltage value of the MOV or TVS is designed to be larger than the normal working voltage of the power supply, so that the clamping element 11 alone cannot withstand the normal working voltage when the switching element 12 is damaged to cause the damage of the whole protection circuit, and the reliability and the safety of the circuit are improved; meanwhile, the clamping element 11 can cut off the follow current of the switching element 12 in the series circuit, and the damage of the switching element 12 to the self and the protected circuit caused by the follow current is reduced. The switching element 12 connected in series with the clamp element 11 can effectively improve the non-operating voltage of the surge suppression circuit 1 by using the negative resistance characteristic of the switching element 12, and improve the protection effect of the surge suppression circuit 1 by reducing the impact of surge energy on a protected circuit, and can make the loss attenuation of a protection circuit extremely low by using the characteristic that the leakage current of the switching element 12 is extremely low when a power supply normally works, thereby further enhancing the stability and reliability of long-term work of the surge suppression circuit 1 and prolonging the service life. The first regulator circuit 21 and the second regulator circuit 22 can realize accurate voltage distribution to the clamp element 11 and the switch element 12 by using the voltage regulation characteristic of the diode D, and the capacitor C can increase the stability of the regulator circuit 2. When the circuit is in a normal operation state, the first regulation circuit 21 and the second regulation circuit 22 improve the stability and reliability of the use of the clamp element 11 and the switching element 12, thereby enabling the circuit to operate normally reliably for a long time.
Example two:
referring to fig. 3, the present invention discloses an anti-surge circuit for power protection, which is different from the first embodiment in that:
the first stabilizing circuit 21 comprises an inductor L and a diode D in series, wherein the diode D is arranged as a zener diode or a transient suppression diode TVS. The second stabilizing circuit 22 includes an inductor L and a diode D in series, wherein the diode D may also be configured as a zener diode or a transient suppression diode TVS. Wherein, the inductor L and the diode D may be provided in plurality to increase the stability of the circuit.
The implementation principle of the embodiment is as follows: the clamping element 11, MOV or TVS clamps the voltage to a relatively low voltage level, thereby effectively protecting delicate components in the electronic circuit from damage. Furthermore, the clamping voltage value of the MOV or TVS is designed to be greater than the normal operating voltage of the power supply, so as to prevent the clamping element 11 alone from being unable to withstand the normal operating voltage when the switching element 12 is damaged, thereby causing damage to the entire protection line, and increasing the reliability and safety of the line. Meanwhile, the clamping element 11 can cut off the follow current of the switching element 12 in the series circuit, and the damage of the switching element 12 to the self and the protected circuit caused by the follow current is reduced. The switching element 12 connected in series with the clamp element 11 can effectively improve the non-operating voltage of the surge suppression circuit 1 by using the negative resistance characteristic of the switching element 12, and improve the protection effect of the surge suppression circuit 1 by reducing the impact of surge energy on a protected circuit, and can make the loss attenuation of a protection circuit extremely low by using the characteristic that the leakage current of the switching element 12 is extremely low when a power supply normally works, thereby further enhancing the stability and reliability of long-term work of the surge suppression circuit 1 and prolonging the service life. The first regulator circuit 21 and the second regulator circuit 22 can realize accurate voltage distribution to the clamping element 11 and the switching element 12 by using the voltage regulation characteristic of the diode D, and the inductor L can increase the stability of the regulator circuit 2. When the circuit is in a normal operation state, the first regulation circuit 21 and the second regulation circuit 22 improve the stability and reliability of the use of the clamp element 11 and the switching element 12, thereby enabling the circuit to operate normally reliably for a long time.
Example three:
referring to fig. 4, the present invention discloses an anti-surge circuit for power protection, which is different from the first embodiment in that:
the first stabilizing circuit 21 comprises a capacitor C, an inductor L and a diode D in series, wherein the diode D is arranged as a zener diode or a transient suppression diode TVS. The second stabilizing circuit 22 comprises a capacitor C, an inductor L and a diode D in series, wherein the diode D may also be arranged as a zener diode or a transient suppression diode TVS. Wherein, capacitor C, inductor L and diode D all can be provided with a plurality ofly to increase the stability of circuit.
The implementation principle of the embodiment is as follows: the clamping element 11, MOV or TVS clamps the voltage to a relatively low voltage level, thereby effectively protecting delicate components in the electronic circuit from damage. Moreover, the clamping voltage value of the MOV or TVS is designed to be larger than the normal working voltage of the power supply, so that the clamping element 11 alone cannot withstand the normal working voltage when the switching element 12 is damaged to cause the damage of the whole protection circuit, and the reliability and the safety of the circuit are improved; meanwhile, the clamping element 11 can cut off the follow current of the switching element 12 in the series circuit, and the damage of the switching element 12 to the self and the protected circuit caused by the follow current is reduced. The switching element 12 connected in series with the clamp element 11 can effectively improve the non-operating voltage of the surge suppression circuit 1 by using the negative resistance characteristic of the switching element 12, and improve the protection effect of the surge suppression circuit 1 by reducing the impact of surge energy on a protected circuit, and can make the loss attenuation of a protection circuit extremely low by using the characteristic that the leakage current of the switching element 12 is extremely low when a power supply normally works, thereby further enhancing the stability and reliability of long-term work of the surge suppression circuit 1 and prolonging the service life. The first regulator circuit 21 and the second regulator circuit 22 can realize accurate voltage distribution to the clamp element 11 and the switch element 12 by using the voltage regulation characteristic of the diode D, and the inductor L and the capacitor C can increase the stability of the regulator circuit 2. When the circuit is in a normal operation state, the first regulation circuit 21 and the second regulation circuit 22 improve the stability and reliability of the use of the clamp element 11 and the switching element 12, thereby enabling the circuit to operate normally reliably for a long time.
Example four:
referring to fig. 5, the present invention discloses an anti-surge circuit for power protection, which is different from the first embodiment in that:
the first stabilizing circuit 21 comprises a resistor R, a capacitor C, an inductor L and a diode D in series, wherein the diode D is arranged as a zener diode or a transient suppression diode TVS. The second stabilizing circuit 22 comprises a resistor R, a capacitor C, an inductor L and a diode D in series, wherein the diode D may also be arranged as a zener diode or a transient suppression diode TVS. Wherein, the resistor R, the capacitor C, the inductor L and the diode D can be provided in plurality to increase the stability of the circuit.
The implementation principle of the embodiment is as follows: the clamping element 11, MOV or TVS clamps the voltage to a relatively low voltage level, thereby effectively protecting delicate components in the electronic circuit from damage. Moreover, the clamping voltage value of the MOV or TVS is designed to be larger than the normal working voltage of the power supply, so that the clamping element 11 alone cannot withstand the normal working voltage when the switching element 12 is damaged to cause the damage of the whole protection circuit, and the reliability and the safety of the circuit are improved; meanwhile, the clamping element 11 can cut off the follow current of the switching element 12 in the series circuit, and the damage of the switching element 12 to the self and the protected circuit caused by the follow current is reduced. The switching element 12 connected in series with the clamp element 11 can effectively improve the non-operating voltage of the surge suppression circuit 1 by using the negative resistance characteristic of the switching element 12, and improve the protection effect of the surge suppression circuit 1 by reducing the impact of surge energy on a protected circuit, and can make the loss attenuation of a protection circuit extremely low by using the characteristic that the leakage current of the switching element 12 is extremely low when a power supply normally works, thereby further enhancing the stability and reliability of long-term work of the surge suppression circuit 1 and prolonging the service life. The first regulator circuit 21 and the second regulator circuit 22 may realize accurate voltage distribution to the clamping element 11 and the switching element 12 by using the voltage regulation characteristic of the diode D, and the capacitor C, the inductor L, and the resistor R may increase the stability of the regulator circuit 2. When the circuit is in a normal operation state, the first regulation circuit 21 and the second regulation circuit 22 improve the stability and reliability of the use of the clamp element 11 and the switching element 12, thereby enabling the circuit to operate normally reliably for a long time.
Example five:
referring to fig. 6, the present invention discloses an anti-surge circuit for power protection, which is different from the first embodiment in that:
the first stabilizing circuit 21 comprises two parallel branches, each branch comprising a capacitor C, an inductor L and a diode D in series, wherein the diode D is configured as a zener diode or a transient suppression diode TVS. The second stabilizing circuit 22 comprises two parallel branches, each branch comprising a capacitor C, an inductor L and a diode D in series, wherein the diode D may also be configured as a zener diode or a transient suppression diode TVS. The number of the gas paths may be plural, and the number of the capacitors C, the inductors L, and the diodes D may also be plural.
The implementation principle of the embodiment is as follows: the clamping element 11, MOV or TVS clamps the voltage to a relatively low voltage level, thereby effectively protecting delicate components in the electronic circuit from damage. Moreover, the clamping voltage value of the MOV or TVS is designed to be larger than the normal working voltage of the power supply, so that the clamping element 11 alone cannot withstand the normal working voltage when the switching element 12 is damaged to cause the damage of the whole protection circuit, and the reliability and the safety of the circuit are improved; meanwhile, the clamping element 11 can cut off the follow current of the switching element 12 in the series circuit, and the damage of the switching element 12 to the self and the protected circuit caused by the follow current is reduced. The switching element 12 connected in series with the clamp element 11 can effectively improve the non-operating voltage of the surge suppression circuit 1 by using the negative resistance characteristic of the switching element 12, and improve the protection effect of the surge suppression circuit 1 by reducing the impact of surge energy on a protected circuit, and can make the loss attenuation of a protection circuit extremely low by using the characteristic that the leakage current of the switching element 12 is extremely low when a power supply normally works, thereby further enhancing the stability and reliability of long-term work of the surge suppression circuit 1 and prolonging the service life. The first regulator circuit 21 and the second regulator circuit 22 can realize accurate voltage distribution to the clamp element 11 and the switch element 12 by using the voltage regulation characteristic of the diode D. The first regulator circuit 21 and the second regulator circuit 22 may further include a plurality of branches, and the plurality of branches may further include a plurality of components. The plurality of resistors R is advantageous to increase the stability of the circuit, and the plurality of capacitors C and the plurality of inductors L are advantageous to increase the stability of the voltage stabilizing circuit 2. When the circuit is in a normal operation state, the first regulation circuit 21 and the second regulation circuit 22 improve the stability and reliability of the use of the clamp element 11 and the switching element 12, thereby enabling the circuit to operate normally reliably for a long time.
Example six:
referring to fig. 7, the present invention discloses an anti-surge circuit for power protection, which is different from the first embodiment in that:
the first stabilizing circuit 21 includes a resistor R, a capacitor C, and an inductor L connected in series. The second stabilizing circuit 22 includes a resistor R, an inductor L and a diode D connected in series, and a capacitor C connected in parallel across the resistor R, wherein the diode D may also be configured as a zener diode or a transient suppression diode TVS. Here, the resistor R, the capacitor C, the inductor L, and the diode D may be provided in plurality.
The implementation principle of the embodiment is as follows: the clamping element 11, MOV or TVS clamps the voltage to a relatively low voltage level, thereby effectively protecting delicate components in the electronic circuit from damage. Moreover, the clamping voltage value of the MOV or TVS is designed to be larger than the normal working voltage of the power supply, so that the clamping element 11 alone cannot withstand the normal working voltage when the switching element 12 is damaged to cause the damage of the whole protection circuit, and the reliability and the safety of the circuit are improved; meanwhile, the clamping element 11 can cut off the follow current of the switching element 12 in the series circuit, and the damage of the switching element 12 to the self and the protected circuit caused by the follow current is reduced. The switching element 12 connected in series with the clamp element 11 can effectively improve the non-operating voltage of the surge suppression circuit 1 by using the negative resistance characteristic of the switching element 12, and improve the protection effect of the surge suppression circuit 1 by reducing the impact of surge energy on a protected circuit, and can make the loss attenuation of a protection circuit extremely low by using the characteristic that the leakage current of the switching element 12 is extremely low when a power supply normally works, thereby further enhancing the stability and reliability of long-term work of the surge suppression circuit 1 and prolonging the service life. The first voltage stabilizing circuit 21 realizes voltage stabilization of the clamping element 11 by matching of a resistor, a capacitor and an inductor, and the second voltage stabilizing circuit 22 realizes accurate distribution of voltage on the switching element 12 by utilizing the voltage stabilization characteristic of the diode D; the inductor and the resistor and the capacitor connected in parallel with the resistor are beneficial to improving the stability of the second voltage stabilizing circuit 22. When the circuit is in a normal operation state, the first regulation circuit 21 and the second regulation circuit 22 improve the stability and reliability of the use of the clamp element 11 and the switching element 12, thereby enabling the circuit to operate normally reliably for a long time.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (8)
1. An anti-surge circuit for power protection is connected in parallel at the power input end of a protected circuit, and is characterized in that: including surge suppression circuit (1) and voltage stabilizing circuit (2), surge suppression circuit (1) is including clamp component (11) and switching element (12), voltage stabilizing circuit (2) are including first voltage stabilizing circuit (21) and second voltage stabilizing circuit (22), the one end electricity of clamp component (11) is connected by a wiring end of protection circuit, the other end electricity of clamp component (11) is connected the one end of switching element (12), the other end electricity of switching element (12) is connected by another wiring end of protection circuit, the both ends of clamp component (11) are parallelly connected first voltage stabilizing circuit (21), the both ends of switching element (12) are parallelly connected second voltage stabilizing circuit (22).
2. The surge protection circuit for power protection as claimed in claim 1, wherein: the clamping element (11) is set to MOV or TVS.
3. The surge protection circuit for power protection as claimed in claim 1, wherein: the switching element (12) is arranged as a GDT, TSS, thyristor, glass gas discharge tube or discharge gap.
4. The surge protection circuit for power protection as claimed in claim 1, wherein: the first voltage stabilizing circuit (21) is set to be a resistor R, a capacitor C, an inductor L or a diode D, or set to be a combination mode of any two, three or four of the above.
5. The surge protection circuit for power protection as claimed in claim 1, wherein: the second voltage stabilizing circuit (22) is set to be a resistor R, a capacitor C, an inductor L or a diode D, or set to be a combination mode of any two, three or four of the above.
6. An anti-surge circuit for power supply protection according to claim 4 or 5, wherein: the diode D is arranged as a zener diode or a transient suppression diode TVS.
7. An anti-surge circuit for power supply protection according to claim 4 or 5, wherein: at least one of the resistor R, the capacitor C, the inductor L or the diode D is arranged.
8. The surge protection circuit for power protection as claimed in claim 7, wherein: the electric connection mode of the components in any combination mode of the resistor R, the capacitor C, the inductor L or the diode D is set to be in series connection or parallel connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010663533.3A CN111864708A (en) | 2020-07-10 | 2020-07-10 | Surge-proof circuit for power supply protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010663533.3A CN111864708A (en) | 2020-07-10 | 2020-07-10 | Surge-proof circuit for power supply protection |
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| Publication Number | Publication Date |
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| CN111864708A true CN111864708A (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010663533.3A Pending CN111864708A (en) | 2020-07-10 | 2020-07-10 | Surge-proof circuit for power supply protection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114744602A (en) * | 2022-04-15 | 2022-07-12 | 华为技术有限公司 | Protection circuit and terminal equipment |
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2020
- 2020-07-10 CN CN202010663533.3A patent/CN111864708A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114744602A (en) * | 2022-04-15 | 2022-07-12 | 华为技术有限公司 | Protection circuit and terminal equipment |
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