CN111490672A - Power protection circuit, power supply and electronic equipment - Google Patents
Power protection circuit, power supply and electronic equipment Download PDFInfo
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- CN111490672A CN111490672A CN202010323684.4A CN202010323684A CN111490672A CN 111490672 A CN111490672 A CN 111490672A CN 202010323684 A CN202010323684 A CN 202010323684A CN 111490672 A CN111490672 A CN 111490672A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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Abstract
The embodiment of the invention discloses a power supply protection circuit, a power supply and electronic equipment. The power protection circuit includes: the protection branch circuit is connected between the first power supply circuit and the second power supply circuit; the protection branch comprises at least two overvoltage protection devices, and the at least two overvoltage protection devices are connected between the first power supply circuit and the second power supply circuit in series; wherein, at least two overvoltage protection devices comprise a voltage limiting type protection device and a switch type protection device; the voltage division branch is connected with the protection branch in parallel; the voltage division branch circuit comprises at least two resistive devices, and the at least two resistive devices are respectively connected to two ends of the at least two overvoltage protection devices in parallel so as to balance the voltage division ratio between the at least two overvoltage protection devices. Compared with the prior art, the embodiment of the invention can simultaneously meet the requirements of power frequency resistance and lightning stroke residual voltage, and has stronger practicability.
Description
Technical Field
The embodiment of the invention relates to the technical field of electronic circuits, in particular to a power supply protection circuit, a power supply and electronic equipment.
Background
The power supply is widely applied to electronic equipment and provides electric energy for the electronic equipment. However, when events such as sudden power failure, sudden power supply, power supply of a generator, manual irregular operation and the like occur, power supply interference such as operation overvoltage, power frequency overvoltage and the like is often caused. These power supply disturbances can have serious consequences such as failure, fire, etc. of overvoltage protection devices in the power supply.
In the prior art, a power supply circuit mostly adopts a voltage-limiting protection device as an overvoltage protection device, if the voltage resistance of the voltage-limiting protection device is high, the lightning stroke residual voltage of the voltage-limiting protection device is increased, and the voltage resistance cost of a rear-stage chip is increased; if the voltage-limiting type protection device has low voltage resistance, although the residual voltage of lightning stroke can be reduced, the power frequency resistance of the voltage-limiting type protection device can not meet the requirement. Therefore, the selection of the power frequency resistance of the voltage-limiting protection device and the selection of the residual lightning voltage are a group of contradictions, and the problem that the power frequency resistance and the residual lightning voltage cannot be simultaneously met exists.
Disclosure of Invention
The embodiment of the invention provides a power supply protection circuit, a power supply and electronic equipment, so that the power supply protection circuit can meet the requirements of power frequency resistance and lightning stroke residual voltage.
In a first aspect, an embodiment of the present invention provides a power protection circuit, where the power protection circuit includes:
the protection branch is connected between the first power supply circuit and the second power supply circuit; the protection branch comprises at least two overvoltage protection devices, and the at least two overvoltage protection devices are connected between the first power supply circuit and the second power supply circuit in series; wherein, at least two overvoltage protection devices comprise a voltage limiting type protection device and a switch type protection device;
the voltage division branch is connected with the protection branch in parallel; the voltage division branch circuit comprises at least two resistive devices, and the at least two resistive devices are respectively connected to two ends of the at least two overvoltage protection devices in parallel so as to balance the voltage division ratio between the at least two overvoltage protection devices.
Optionally, the voltage-limiting protection device comprises a voltage dependent resistor device or a transient suppression diode; the switching type protection device includes at least one of a gas discharge tube and a solid discharge tube.
Optionally, the protection branch comprises a first overvoltage protection device and a second overvoltage protection device; the voltage dividing branch comprises a first resistive device and a second resistive device;
the first resistive device is connected in parallel to two ends of the first overvoltage protection device, and the second resistive device is connected in parallel to two ends of the second overvoltage protection device.
Optionally, the first overvoltage protection device is a voltage-limiting protection device, and the second overvoltage protection device is a switch-type protection device;
the resistance of the first resistive device is greater than the resistance of the second resistive device.
Optionally, the voltage dividing branch further includes a capacitive device, and the capacitive device is connected in series or in parallel with the resistive device.
In a second aspect, an embodiment of the present invention further provides a power supply, where the power supply includes: a rectifier circuit, a DC-DC circuit and a power supply protection circuit as described in any of the embodiments of the present invention.
Optionally, the power protection circuit is connected between the live wire and the neutral wire; alternatively, the first and second electrodes may be,
the power supply protection circuit is connected between the live wire and the ground wire; alternatively, the first and second electrodes may be,
and the power supply protection circuit is connected between the zero line and the ground wire.
Optionally, the power protection circuit is connected between the positive electrode and the negative electrode of the output of the rectification circuit.
Optionally, the power protection circuit is connected between a negative electrode of the rectifier circuit output and a negative electrode of the DC-DC circuit output.
In a third aspect, an embodiment of the present invention further provides an electronic device, where the electronic device includes: a power supply protection circuit as claimed in any of the embodiments of the present invention.
According to the embodiment of the invention, the protection branch comprises at least two overvoltage protection devices connected in series, so that each overvoltage protection device can be used as a voltage-bearing device of power supply voltage, and therefore, the voltage at two ends of each overvoltage protection device is lower than the power supply voltage. The at least two overvoltage protection devices comprise a voltage-limiting protection device and a switch-type protection device, and the lightning strike residual voltage of the switch-type protection device is lower than that of the voltage-limiting protection device, so that the whole lightning strike residual voltage of the protection branch is reduced in a conducting state compared with the situation that only the voltage-limiting protection device is arranged; the voltage division branch comprises at least two resistive devices to balance the voltage division ratio between the at least two overvoltage protection devices, so that the resistive devices are arranged at two ends of the voltage limiting type protection device and the switch type protection device to distribute voltage; compared with the method that the resistive device is only connected in parallel on the voltage limiting type protection device (or the resistive device is only connected in parallel on the switch type protection device), the method and the device can ensure that the voltage division effect of the voltage limiting type protection device and the switch type protection device is better, the voltage distribution is more reasonable, and the practicability is higher. Compared with the prior art, the embodiment of the invention ensures that the voltage limiting protection device is prevented from bearing the power supply voltage independently under the condition of reasonable voltage division ratio of the voltage limiting protection device and the switch type protection device, and the voltage limiting protection device with lower voltage withstanding grade can be adopted, so that the protection branch can simultaneously meet the requirements of power frequency resistance and lightning stroke residual voltage, and the protection performance of the power supply protection circuit on a post-stage circuit is favorably improved.
Drawings
Fig. 1 is a circuit diagram of a power protection circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of another power protection circuit according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of another power protection circuit according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of a power supply according to an embodiment of the present invention;
FIG. 5 is a circuit diagram of another power supply provided by an embodiment of the present invention;
FIG. 6 is a circuit diagram of another power supply according to an embodiment of the present invention;
FIG. 7 is a circuit diagram of another power supply according to an embodiment of the present invention;
FIG. 8 is a circuit diagram of another power supply according to an embodiment of the present invention;
FIG. 9 is a circuit diagram of another power supply according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment of the invention provides a power supply protection circuit, which is used for performing overvoltage protection on a power supply so as to prevent the power supply from being damaged by lightning surge. Fig. 1 is a circuit diagram of a power protection circuit according to an embodiment of the present invention. Referring to fig. 1, the power protection circuit includes a protection branch 31 and a voltage dividing branch 32. The protection branch 31 is connected between the first power supply line 41 and the second power supply line 42; the protection branch 31 comprises at least two overvoltage protection devices (fig. 1 exemplarily shows two overvoltage protection devices, a first overvoltage protection device 311 and a second overvoltage protection device 312, respectively), which are connected in series between the first power supply line 41 and the second power supply line 42; wherein the at least two overvoltage protection devices comprise a voltage limiting type protection device and a switch type protection device. The voltage dividing branch 32 is connected in parallel with the protection branch 31; the voltage dividing branch 32 includes at least two resistive devices (fig. 1 exemplarily shows two resistive devices, namely a first resistive device R1 and a second resistive device R2), which are respectively connected in parallel across the at least two overvoltage protection devices to balance the voltage dividing ratio between the at least two overvoltage protection devices. Illustratively in fig. 1, a first resistive device R1 is connected in parallel across the first overvoltage protection device 311, and a second resistive device R2 is connected in parallel across the second overvoltage protection device 312.
The first power supply line 41 and the second power supply line 42 refer to two lines for supplying power to the power supply. Illustratively, the first power supply line 41 and the second power supply line 42 are a live line and a neutral line, respectively, the first power supply line 41 and the second power supply line 42 are a positive line and a negative line output by a rectifier circuit, respectively, the first power supply line 41 and the second power supply line 42 are a positive line and a negative line output by a DC-DC circuit, respectively, or the first power supply line 41 and the second power supply line 42 are a negative line output by a rectifier circuit and a negative line output by a DC-DC circuit, respectively.
The voltage limiting type protection device is also called a clamping type protection device, shows a clamping characteristic, and is a device which shows a high impedance characteristic when no overvoltage exists and reduces the impedance along with the increase of surge voltage. When an overvoltage appears between two electrodes of the voltage-limiting protection device, the voltage-limiting protection device can clamp the voltage to a relatively fixed voltage value, so that the protection of a post-stage circuit is realized. The voltage limiting protection device may be, for example, a piezoresistive device or a transient suppression diode. The switch type protection device presents a switch characteristic, presents a high impedance characteristic when no lightning transient overvoltage exists, and once the lightning transient overvoltage is responded, the impedance of the switch type protection device is suddenly changed into a low impedance characteristic, so that lightning current is allowed to pass through the switch type protection device. The lightning residual voltage of the switch type protection device is lower than that of the voltage limiting type protection device.
The voltage-limiting protection device and the switch-type protection device are connected in series, so that the power voltage is divided on the voltage-limiting protection device and the switch-type protection device, the voltage at two ends of the voltage-limiting protection device is lower than the power voltage, and the voltage-limiting protection device with lower power frequency resistance and lower lightning stroke residual voltage can be selected. And because the switch-type protection device is lower than the voltage-limiting protection device in lightning stroke residual voltage, the switch-type protection device is beneficial to reducing the lightning stroke residual voltage of the power supply protection circuit on the basis of ensuring the power frequency resistance.
A resistive device refers to a device that exhibits resistive properties, such as a resistor or a transistor. If the voltage dividing branch 32 is not provided, the voltage distribution at the two ends of the overvoltage protection device is mainly determined by the equivalent resistance of the overvoltage protection device in the normal working state. However, the equivalent resistances of the protection devices in the voltage-limiting protection device and the switch-type protection device are different, and it can be known from the principle of series connection of the resistors that most of the voltage is distributed on the protection device with a larger equivalent resistance, which causes an excessively high distributed voltage of the overvoltage protection device with a larger equivalent resistance, that is, uneven voltage division of the overvoltage protection device. The partial pressure at the two ends of the overvoltage protection device can be changed by adjusting the resistance value of the resistive device connected with the overvoltage protection device in parallel. Therefore, the voltage dividing branch 32 provided in the embodiment of the present invention can redistribute the voltages at the two ends of the voltage limiting type protection device and the switch type protection device.
In summary, the protection branch 31 provided in the embodiment of the present invention includes at least two overvoltage protection devices connected in series, so that each overvoltage protection device can be used as a voltage-bearing device for the power voltage, and therefore, the voltage at two ends of each overvoltage protection device is lower than the power voltage; the at least two overvoltage protection devices comprise a voltage-limiting protection device and a switch-type protection device, and the lightning strike residual voltage of the switch-type protection device is lower than that of the voltage-limiting protection device, so that compared with the situation that only the voltage-limiting protection device is arranged, the whole lightning strike residual voltage of the protection branch 31 is reduced in a conducting state; the voltage dividing branch 32 comprises at least two resistive devices to balance the voltage dividing proportion between the at least two overvoltage protection devices, so that the resistive devices are arranged at two ends of the voltage limiting type protection device and the switch type protection device to distribute voltage; compared with the method that the resistive device is only connected in parallel on the voltage limiting type protection device (or the resistive device is only connected in parallel on the switch type protection device), the method and the device can ensure that the voltage division effect of the voltage limiting type protection device and the switch type protection device is better, the voltage distribution is more reasonable, and the practicability is stronger. Compared with the prior art, the embodiment of the invention ensures that the voltage limiting protection device is prevented from bearing the power supply voltage independently under the condition of reasonable voltage division ratio of the voltage limiting protection device and the switch type protection device, and the voltage limiting protection device with lower voltage withstanding grade can be adopted, so that the protection branch 31 can simultaneously meet the requirements of power frequency resistance and lightning stroke residual voltage, and is beneficial to improving the protection performance of the power supply protection circuit on a post-stage circuit.
In the above embodiments, the switching type protection device may alternatively be a gas discharge tube or a solid discharge tube, for example. When the applied voltage of the gas discharge tube is increased to make the field intensity between electrodes exceed the insulation strength of gas, the gap between the two electrodes breaks down the discharge tube, the original insulation state is converted into a conductive state, the voltage between the two electrodes of the discharge tube is maintained at the lightning residual voltage level determined by a discharge arc channel after the conduction, and the lightning residual voltage is generally very low. The solid discharge tube is also called as a semiconductor discharge tube, is made by utilizing the thyristor principle, triggers a device to conduct discharge by depending on the breakdown current of a PN junction, can flow large surge current or pulse current, forms an overvoltage protection range by the range of the breakdown voltage, and is generally low in lightning stroke residual voltage.
Fig. 2 is a circuit diagram of another power protection circuit according to an embodiment of the present invention. Referring to fig. 2, on the basis of the above embodiments, optionally, the first overvoltage protection device is a varistor MOV, and the second overvoltage protection device is a gas discharge tube GDT; the resistance of the first resistive device R1 is greater than the resistance of the second resistive device R2. The equivalent resistance of the voltage dependent resistor MOV is smaller than that of the gas discharge tube GDT, if the action of the voltage division branch 32 is not considered, the divided voltage at the two ends of the gas discharge tube GDT is large, and the power voltage is mainly applied to the two ends of the gas discharge tube GDT. According to the embodiment of the invention, the first resistive device R1 is connected in parallel at two ends of the piezoresistor MOV, the second resistive device R2 is connected in parallel at two ends of the gas discharge tube GDT, and the resistance value of the first resistive device R1 is larger than that of the second resistive device R2, so that the partial pressure of the gas discharge tube GDT is reduced, the gas discharge tube GDT and the piezoresistor MOV can obtain a proper partial pressure proportion, and a certain power frequency withstand voltage can be stably borne.
Fig. 3 is a circuit diagram of another power protection circuit according to an embodiment of the present invention. Referring to fig. 3, on the basis of the above embodiments, optionally, the first overvoltage protection device is a varistor MOV, and the second overvoltage protection device is a solid discharge tube TSS; the resistance of the first resistive device R1 is greater than the resistance of the second resistive device R2. The equivalent resistance of the voltage dependent resistor MOV is smaller than that of the solid discharge tube TSS, if the action of the voltage dividing branch 32 is not considered, the divided voltage at the two ends of the solid discharge tube TSS is larger, and the power voltage is mainly applied to the two ends of the solid discharge tube TSS. According to the embodiment of the invention, the first resistive device R1 is connected in parallel at two ends of the piezoresistor MOV, the second resistive device R2 is connected in parallel at two ends of the solid discharge tube TSS, and the resistance value of the first resistive device R1 is larger than that of the second resistive device R2, so that the partial voltage of the solid discharge tube TSS can be reduced, the solid discharge tube TSS and the piezoresistor MOV can obtain a proper partial voltage proportion, and a certain power frequency withstand voltage can be stably borne.
It should be noted that, in the above embodiments, the voltage dividing branch is exemplarily shown to include a resistive device, but the present invention is not limited thereto, and in other embodiments, the voltage dividing branch may further include a capacitive device, which may be a capacitor, for example. The capacitive device may be connected in series or in parallel with the resistive device such that the resistive and capacitive devices together regulate the voltage division across the overvoltage protection device.
The embodiment of the invention also provides a power supply. Fig. 4 is a circuit diagram of a power supply according to an embodiment of the invention. Referring to fig. 4, the power supply includes: a rectifier circuit 10, a DC-DC circuit 20 and a power supply protection circuit 30 as provided by any of the embodiments of the invention. Since the power supply includes the power protection circuit 30 provided in any embodiment of the present invention, the technical principle and the resulting effect are similar, and are not described in detail.
With continued reference to fig. 4, the rectifier circuit 10 refers to a circuit for converting ac power into dc power, and the rectifier circuit 10 may be, for example, a full-wave rectifier circuit or a half-wave rectifier circuit, for example, the rectifier circuit 10 includes a first ac input terminal 11, a second ac input terminal 13, a first rectified output terminal 12, and a second rectified output terminal 14, where the first ac input terminal 11 is electrically connected to the live line L, the second ac input terminal 13 is electrically connected to the neutral line N, the first rectified output terminal 12 is a positive pole output by the rectifier circuit 10, and the second rectified output terminal 14 is a negative pole output by the rectifier circuit 10.
Alternatively, as shown in fig. 4, the rectifier circuit 10 is a full-wave rectifier circuit, the rectifier circuit 10 includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, an anode of the first diode D1 is electrically connected to the first ac input terminal 11, a cathode of the first diode D1 is electrically connected to the first rectification output terminal 12, an anode of the second diode D2 is electrically connected to the second ac input terminal 13, a cathode of the second diode D2 is electrically connected to the first rectification output terminal 12, an anode of the third diode D3 is electrically connected to the second rectification output terminal 14, a cathode of the third diode D3 is electrically connected to the second ac input terminal 13, an anode of the fourth diode D4 is electrically connected to the second rectification output terminal 14, and a cathode of the fourth diode D4 is electrically connected to the first ac input terminal 11.
With continued reference to fig. 4, the DC-DC circuit 20 refers to a circuit for converting high-voltage (or low-voltage) DC power to low-voltage (or high-voltage) DC power, and the DC-DC circuit 20 may be, for example, a voltage boosting circuit, a voltage reducing circuit, or a voltage boosting and reducing circuit. Illustratively, the DC-DC circuit 20 includes a first input 21, a second input 22, a first output 23, and a second output 24; the first input terminal 21 is electrically connected to the first rectified output terminal 12 of the rectifying circuit 10, the second input terminal 22 is electrically connected to the second rectified output terminal 14 of the rectifying circuit 10, the first output terminal 23 is a positive terminal of the output of the DC-DC circuit 20, and the second output terminal 24 is a negative terminal of the output of the DC-DC circuit 20.
With continued reference to fig. 4, the second output terminal 24 of the DC-DC circuit 20 is optionally grounded.
With continued reference to FIG. 4, in one embodiment of the present invention, the power protection circuit 30 is optionally connected between the live line L and the neutral line N, so that when a lightning surge voltage occurs, the lightning surge voltage is discharged through the live line L, the power protection circuit 30 and the neutral line N, thereby achieving protection of the subsequent circuit.
It should be noted that the power protection circuit is shown in fig. 4 as being connected between the live line L and the neutral line N for example, and not limiting to the invention, the power protection circuit 30 may be connected to other locations of the power source, for example, the power protection circuit may be connected between the live line L and the ground line, and for example, the power protection circuit may be connected between the neutral line L and the ground line.
FIG. 5 is a circuit diagram of another power supply provided by an embodiment of the invention, referring to FIG. 5, in one embodiment of the invention, a power protection circuit 30 is optionally connected between the positive pole and the negative pole of the output of the rectification circuit 10. thus, when a lightning surge voltage occurs, the lightning surge voltage is discharged through the live line L, the rectification circuit 10, the power protection circuit 30 and the ground, and protection of the subsequent circuit is realized.
FIG. 6 is a circuit diagram of another power supply provided by an embodiment of the invention, referring to FIG. 6, in one embodiment of the invention, a power protection circuit 30 is optionally connected between the negative pole of the output of the rectification circuit 10 and the negative pole of the output of the DC-DC circuit 20. thus, when a lightning surge voltage occurs, the lightning surge voltage is discharged through a live line L, the rectification circuit 10, the DC-DC circuit 20, the power protection circuit 30 and the ground, and the protection of the subsequent circuit is realized.
With reference to fig. 4-6, based on the above embodiments, optionally, the power supply further includes an input capacitor C1 and an input inductor L1, the input capacitor C1 is connected between the live line L and the neutral line N, and the input inductor L1 is connected between the live line L and the rectifier circuit 10, the input capacitor C1 and the input inductor L1 are used to filter the input voltage, so as to filter the interference in the input voltage, so as to maintain the output voltage of the power supply stable.
With reference to fig. 4-6, on the basis of the above embodiments, optionally, the power supply further includes a second capacitor C2, and the second capacitor C2 is connected between the first rectified output end 12 and the second rectified output end 14 of the rectification circuit 10. The second capacitor C2 is used for filtering the voltage output by the rectifier circuit 10.
With reference to fig. 4-6, based on the above embodiments, the power supply further optionally includes an output capacitor C3, and the output capacitor C3 is connected between the first output terminal 23 and the second output terminal 24 of the DC-DC circuit 20. The output capacitor C3 is used for removing ripples in the output voltage and improving the quality of the output voltage.
With reference to fig. 4-6, based on the above embodiments, the power supply further optionally includes an output resistor R3, and the output resistor R3 is connected between the first output terminal 23 and the second output terminal 24 of the DC-DC circuit 20. The output resistor R3 is used to achieve impedance matching of the power supply.
With reference to fig. 4-6, based on the above embodiments, optionally, the power supply further includes a first fuse F1 and a second fuse F2, the first fuse F1 is connected in series to the live wire L, and the second fuse F2 is connected in series to the neutral wire N.
It should be noted that fig. 4 to 6 exemplarily show that the first overvoltage protection device is a varistor, and the second overvoltage protection device is a gas discharge tube, but the invention is not limited thereto, and in other embodiments, the first overvoltage protection device may be a varistor, and the second overvoltage protection device is a solid discharge tube, as shown in fig. 7 to 9.
The embodiment of the invention also provides the electronic equipment. Fig. 10 is a schematic structural diagram of an electronic device according to an embodiment of the present invention. Referring to fig. 10, the electronic device includes a power protection circuit as provided by any of the embodiments of the invention. Since the electronic device includes the power protection circuit provided in any embodiment of the present invention, the technical principle and the resulting effect are similar, and are not described in detail. Illustratively, the electronic device may be an electronic chip in automotive electronics, communications, new energy, security, consumer electronics, industrial electronics, medical electronics, and the like.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A power protection circuit, comprising:
the protection branch is connected between the first power supply circuit and the second power supply circuit; the protection branch comprises at least two overvoltage protection devices, and the at least two overvoltage protection devices are connected between the first power supply circuit and the second power supply circuit in series; wherein, at least two overvoltage protection devices comprise a voltage limiting type protection device and a switch type protection device;
the voltage division branch is connected with the protection branch in parallel; the voltage division branch circuit comprises at least two resistive devices, and the at least two resistive devices are respectively connected to two ends of the at least two overvoltage protection devices in parallel so as to balance the voltage division ratio between the at least two overvoltage protection devices.
2. The power protection circuit of claim 1, wherein the voltage limiting protection device comprises a voltage dependent resistor device or a transient suppression diode; the switching type protection device includes at least one of a gas discharge tube and a solid discharge tube.
3. The power protection circuit according to claim 1, wherein the protection branch comprises a first overvoltage protection device and a second overvoltage protection device; the voltage dividing branch comprises a first resistive device and a second resistive device;
the first resistive device is connected in parallel to two ends of the first overvoltage protection device, and the second resistive device is connected in parallel to two ends of the second overvoltage protection device.
4. The power protection circuit according to claim 3, wherein the first overvoltage protection device is a voltage limiting type protection device, and the second overvoltage protection device is a switching type protection device;
the resistance of the first resistive device is greater than the resistance of the second resistive device.
5. The power protection circuit of claim 1, wherein the voltage divider circuit further comprises a capacitive device connected in series or parallel with the resistive device.
6. A power supply, comprising: rectifier circuit, DC-DC circuit and power supply protection circuit according to any of claims 1-5.
7. The power supply of claim 6, wherein the power protection circuit is connected between a live line and a neutral line; alternatively, the first and second electrodes may be,
the power supply protection circuit is connected between the live wire and the ground wire; alternatively, the first and second electrodes may be,
and the power supply protection circuit is connected between the zero line and the ground wire.
8. The power supply of claim 6, wherein the power protection circuit is connected between the positive and negative poles of the rectifier circuit output.
9. The power supply of claim 6, wherein the power protection circuit is connected between the negative pole of the rectifier circuit output and the negative pole of the DC-DC circuit output.
10. An electronic device, comprising: the power supply protection circuit of any of claims 1-5.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN202020236402 | 2020-02-28 | ||
| CN2020202364022 | 2020-02-28 |
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| CN202020622908.7U Active CN212305135U (en) | 2020-02-28 | 2020-04-22 | Power protection circuit, power supply and electronic equipment |
| CN202010323684.4A Pending CN111490672A (en) | 2020-02-28 | 2020-04-22 | Power protection circuit, power supply and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112332395A (en) * | 2020-10-22 | 2021-02-05 | 马鞍山市槟城电子有限公司 | Discharge circuit, surge protection circuit, ignition circuit, and electronic device |
| CN113922652A (en) * | 2021-11-17 | 2022-01-11 | 阳光电源股份有限公司 | Inverter, inverter system, lightning protection circuit and control method of lightning protection circuit |
-
2020
- 2020-04-22 CN CN202020622908.7U patent/CN212305135U/en active Active
- 2020-04-22 CN CN202010323684.4A patent/CN111490672A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112332395A (en) * | 2020-10-22 | 2021-02-05 | 马鞍山市槟城电子有限公司 | Discharge circuit, surge protection circuit, ignition circuit, and electronic device |
| CN112332395B (en) * | 2020-10-22 | 2022-11-29 | 马鞍山市槟城电子有限公司 | Discharge circuit, surge protection circuit, ignition circuit, and electronic device |
| CN113922652A (en) * | 2021-11-17 | 2022-01-11 | 阳光电源股份有限公司 | Inverter, inverter system, lightning protection circuit and control method of lightning protection circuit |
| CN113922652B (en) * | 2021-11-17 | 2024-02-09 | 阳光电源股份有限公司 | Inverter, inverter system, lightning protection circuit and control method of lightning protection circuit |
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Address after: 518116 west side of 1st floor, building e, area a, Hongfa Science Park, Tangtou community, Shiyan street, Bao'an District, Shenzhen City, Guangdong Province Applicant after: Shenzhen Penang Electronics Co.,Ltd. Address before: 518116 west side of 1st floor, building e, area a, Hongfa Science Park, Tangtou community, Shiyan street, Bao'an District, Shenzhen City, Guangdong Province Applicant before: Shenzhen Bencent Electronics Co.,Ltd. |