CN220692824U - Surge protection circuit with low leakage current and long service life - Google Patents
Surge protection circuit with low leakage current and long service life Download PDFInfo
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- CN220692824U CN220692824U CN202322266618.XU CN202322266618U CN220692824U CN 220692824 U CN220692824 U CN 220692824U CN 202322266618 U CN202322266618 U CN 202322266618U CN 220692824 U CN220692824 U CN 220692824U
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- suppression diode
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- surge protection
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- 230000001052 transient effect Effects 0.000 claims abstract description 31
- 230000001629 suppression Effects 0.000 claims abstract description 30
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims abstract description 22
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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Abstract
The utility model discloses a surge protection circuit with low leakage current and long service life, which comprises a load, wherein the load is electrically connected with a live wire and a zero line, the load is connected with a protection circuit in parallel, the protection circuit comprises a high-power resistor group R, a bidirectional transient voltage suppression diode TVS and a withstand voltage electrodeless capacitor C, the bidirectional transient voltage suppression diode TVS is connected in series between the high-power resistor R and the withstand voltage electrodeless capacitor C, one end of the high-power resistor R is connected with the live wire, the other end of the high-power resistor R is connected with the bidirectional transient voltage suppression diode TVS, one end of the withstand voltage electrodeless capacitor C is connected with the zero line, and the other end of the withstand voltage electrodeless capacitor C is connected with the bidirectional transient voltage suppression diode TVS. The utility model has the advantages that: high sensitivity, long service life and simple structure.
Description
Technical Field
The utility model relates to the technical field of protection circuits, in particular to a surge protection circuit with low leakage current and long service life.
Background
A surge is a transient disturbance that causes the instantaneous voltage on the grid to exceed the nominal normal voltage range under certain conditions. Typically, such transients do not last too long, but the amplitude may be quite high. An instantaneous high, perhaps just a few parts per million, such as lightning, or an instantaneous disconnection of an inductive load, or an instantaneous connection of a large load, can have a significant impact on the grid.
Surge protection circuits are devices or circuits that provide safety protection for various electrical equipment, instrumentation, and communication circuits. For absorbing surges or voltage spikes between the ac power grids, ensuring that the equipment or circuitry it protects is not damaged.
The existing surge protection circuit mainly absorbs the surge in the power grid by using a transient voltage suppression diode or a piezoresistor alone, and has the following defects:
1. the protection circuit of the transient voltage suppression diode is independently used, and the TVS with high avalanche voltage has small flux, so that the TVS is difficult to pass the 1KV surge test;
2. the surge is absorbed by the piezoresistor alone, the frequency of the piezoresistor receiving surge impact increases, the electric leakage increases, the response time is longer, and the performance can be deteriorated.
Disclosure of Invention
The utility model aims to solve the technical problem and provides a surge protection circuit with high sensitivity, long service life, simple structure, low leakage current and long service life.
In order to solve the technical problems, the technical scheme provided by the utility model is as follows: the utility model provides a low leakage current high life's surge protection circuit, includes the load, load and live wire and zero line electric connection, parallel connection has protection circuit on the load, protection circuit includes high-power resistance group R, two-way transient voltage suppression diode TVS and withstand voltage electrodeless capacitor C, the series connection has two-way transient voltage suppression diode TVS between high-power resistance R and the withstand voltage electrodeless capacitor C, high-power resistance R one end is connected with the live wire, and the other end is connected with two-way transient voltage suppression diode TVS, withstand voltage electrodeless capacitor C one end is connected with the zero line, and the other end is connected with two-way transient voltage suppression diode TVS.
Further, the high-power resistor group R is formed by a plurality of resistors in a series connection or a parallel connection.
Further, a lamp is connected between the withstand voltage electrodeless capacitor C and the zero line.
Further, a fuse FU is connected between the high-power resistor group R and the live wire.
Compared with the prior art, the utility model has the advantages that:
1. compared with a protection circuit using a transient voltage suppression diode alone, the bidirectional transient voltage suppression diode TVS with high avalanche voltage has small flux, and is difficult to pass 1KV surge test, and the series resistance in the circuit can play a role in limiting current and can pass 2KV surge test;
2. compared with the common protective circuit using piezoresistors, the bidirectional transient voltage suppression diode TVS of the circuit is basically only used as a switch controlled by voltage, the element has no damage limit, the service life of the circuit is only dependent on capacitance and resistance, and the reasonable selection of the capacitance and resistance element can ensure that the circuit has very long impact service life and is stable.
Drawings
Fig. 1 is a schematic circuit diagram of the present utility model.
Fig. 2 is a schematic diagram of the use of the present utility model.
Detailed Description
The following description of the technical solutions in the embodiments of the present utility model will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that all directional indications such as up, down, left, right, front, and rear … … in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture such as that shown in the drawings, and if the specific posture is changed, the directional indication is changed accordingly.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
The utility model will now be further described with reference to the accompanying drawings.
With reference to fig. 1, the load is connected with a protection circuit in parallel, the protection circuit comprises a high-power resistor group R, a bidirectional transient voltage suppression diode TVS and a withstand voltage electrodeless capacitor C, the bidirectional transient voltage suppression diode TVS is connected between the high-power resistor R and the withstand voltage electrodeless capacitor C in series, one end of the high-power resistor R is connected with a live wire, the other end of the high-power resistor is connected with the bidirectional transient voltage suppression diode TVS, one end of the withstand voltage electrodeless capacitor C is connected with a zero line, the other end of the withstand voltage electrodeless capacitor C is connected with the bidirectional transient voltage suppression diode TVS, the high-power resistor group R is formed by one of series connection or parallel connection through a plurality of resistors, and a fuse FU is connected between the high-power resistor group R and the live wire.
When the power grid is normal, the bidirectional transient voltage suppression diode TVS is in an cut-off state, and the protection circuit only has slight leakage current, namely the leakage current of the bidirectional transient voltage suppression diode TVS is smaller than 1 mu A and very low. When the instantaneous surge voltage appears in the power grid, when the voltage at two ends of the bidirectional transient voltage suppression diode TVS exceeds avalanche voltage, the bidirectional transient voltage suppression diode TVS is rapidly conducted, the conduction time of the bidirectional transient voltage suppression diode TVS is picosecond, at the moment, the circuit becomes an RC absorption circuit, the surge in the power grid is rapidly absorbed, and then the following load is protected.
With reference to fig. 2, the load is connected with a protection circuit in parallel, the protection circuit comprises a high-power resistor group R, a bidirectional transient voltage suppression diode TVS and a withstand voltage electrodeless capacitor C, the bidirectional transient voltage suppression diode TVS is connected between the high-power resistor R and the withstand voltage electrodeless capacitor C in series, one end of the high-power resistor R is connected with a live wire, the other end of the high-power resistor is connected with the bidirectional transient voltage suppression diode TVS, one end of the withstand voltage electrodeless capacitor C is connected with a zero line, the other end of the withstand voltage electrodeless capacitor C is connected with the bidirectional transient voltage suppression diode TVS, the high-power resistor group R is formed by one of series connection or parallel connection through a plurality of resistors, a lamp is connected between the withstand voltage electrodeless capacitor C and the zero line, and a fuse FU is connected between the high-power resistor group R and the live wire.
When an electronic switch (typically a thyristor or a high-voltage MOS transistor) is used for switching or dimming, a surge protection circuit is generally required due to low withstand voltage due to the limitation of components or volumes. When a low-power (3-5W) capacitance-free scheme (equal lamp is used, the leakage current of the conventional surge protection circuit 20 mu A or more can lead the lamp to be slightly bright under the condition that an electronic switch is closed.
The utility model and its embodiments have been described in a non-limiting manner, and the actual construction is not limited to the embodiments of the utility model as shown in the drawings. In summary, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical solution should not be creatively devised without departing from the gist of the present utility model.
Claims (4)
1. The utility model provides a low leakage current high life's surge protection circuit, includes the load, load and live wire and zero line electric connection, its characterized in that: the load is connected with a protection circuit in parallel, the protection circuit comprises a high-power resistor group R, a bidirectional transient voltage suppression diode TVS and a withstand voltage electrodeless capacitor C, the bidirectional transient voltage suppression diode TVS is connected between the high-power resistor group R and the withstand voltage electrodeless capacitor C in series, one end of the high-power resistor group R is connected with a live wire, the other end of the high-power resistor group R is connected with the bidirectional transient voltage suppression diode TVS, one end of the withstand voltage electrodeless capacitor C is connected with a zero line, and the other end of the withstand voltage electrodeless capacitor C is connected with the bidirectional transient voltage suppression diode TVS.
2. The surge protection circuit of claim 1, wherein the low leakage current high lifetime surge protection circuit comprises: the high-power resistor group R is formed by a plurality of resistors in a series connection or a parallel connection.
3. The surge protection circuit of claim 1, wherein the low leakage current high lifetime surge protection circuit comprises: and a lamp is connected between the withstand voltage electrodeless capacitor C and the zero line.
4. The surge protection circuit of claim 1, wherein the low leakage current high lifetime surge protection circuit comprises: a fuse FU is connected between the high-power resistor group R and the live wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322266618.XU CN220692824U (en) | 2023-08-23 | 2023-08-23 | Surge protection circuit with low leakage current and long service life |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322266618.XU CN220692824U (en) | 2023-08-23 | 2023-08-23 | Surge protection circuit with low leakage current and long service life |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220692824U true CN220692824U (en) | 2024-03-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322266618.XU Active CN220692824U (en) | 2023-08-23 | 2023-08-23 | Surge protection circuit with low leakage current and long service life |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220692824U (en) |
-
2023
- 2023-08-23 CN CN202322266618.XU patent/CN220692824U/en active Active
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