CN203722222U - Surge protection circuit - Google Patents
Surge protection circuit Download PDFInfo
- Publication number
- CN203722222U CN203722222U CN201320829799.6U CN201320829799U CN203722222U CN 203722222 U CN203722222 U CN 203722222U CN 201320829799 U CN201320829799 U CN 201320829799U CN 203722222 U CN203722222 U CN 203722222U
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- oxide
- semiconductor
- metal
- control unit
- switch control
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- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The utility model discloses a surge protection circuit. The circuit comprises a first resistor, a first MOS tube, a second MOS tube, a voltage sampling unit and a switch control unit. One terminal of the first resistor, the source electrode of the first MOS tube and the source electrode of the second MOS tube are connected with a power input terminal; the other terminal of the first resistor, the drain electrode of the first MOS tube and the drain electrode of the second MOS tube are connected to be used as a power output terminal; and the grid electrodes of the first MOS tube and the second MOS tube are connected to the switch control unit. The voltage sampling unit samples the voltage value of the power output terminal and sends the sampled voltage value to the switch control unit, which controls the first MOS tube and the second MOS tube, according to a sampled voltage value output signal, to be conducted in turn. By means of the added switch control unit and soft switch technology, the circuit controls disconnection and connection time of the MOS tubes intelligently, can effectively inhibit the surge current generated when a power supply is turned on or off, does not affect voltage output when the power supply works stably, and reduces unnecessary power loss.
Description
Technical field
The utility model relates to power technique fields, relates to especially a kind of surge protection circuit.
Background technology
Current various electrical equipment are connected moment at mains switch, can produce very large surge voltage and surge current, surge current has not only shortened the life-span of filter capacitor, also wiring, cabling in the diode in rectification circuit, fuse, power supply is had to greater impact simultaneously.Traditional surge protection circuit is a kind ofly can connect the protective circuit that moment suppresses surge voltage and surge current at mains switch, generally in the circuit design of field of power supplies, must consider surge protection.
The method of traditional surge current suppression is in the loop of rectification circuit, seal in temperature-sensitive first resistance (NTC) of suitable negative temperature coefficient, temperature-sensitive the first resistance under normal conditions its resistance is larger, mains switch is connected moment, and temperature-sensitive the first resistance is larger, has limited the charging current to electric capacity, thereby suppressed surge current, temperature-sensitive the first resistance is due to heating, and its resistance reduces because of heating, to reduce by the first resistance oneself power consumption and to reduce the impact on circuit efficiency.This method simple possible; if but short supply interruption; because temperature-sensitive the first resistance is longer cooling time; at temperature-sensitive the first resistance when uncolled; if mains switch is connected again or circuit re-powers; at this moment the surge producing can be very large, and the protective effect meeting of temperature-sensitive the first resistance declines, even completely ineffective.When circuit is normally worked, temperature-sensitive the first resistance seals in circuit loop and can produce very lossy, lowers power-efficient, and is not suitable for device for suppression of continuous pulse.
Utility model content
In order to overcome the defect existing in above-mentioned prior art; the utility model provides a kind of surge protection circuit of simple in structure, good stability; adopt soft switch technique; the switch off time of Based Intelligent Control metal-oxide-semiconductor; surge voltage and electric current in the time of can effectively suppressing mains switch; after power supply steady operation, do not affect Voltage-output, reduce unnecessary power loss.
For solving the problems of the technologies described above, the technical solution of the utility model is:
A kind of surge protection circuit, comprise the first resistance, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, voltage sample unit and switch control unit, one end of described the first resistance, the source electrode of the source electrode of described the first metal-oxide-semiconductor and the second metal-oxide-semiconductor is connected with power input, the other end of described the first resistance is connected as power output end with the drain electrode of the first metal-oxide-semiconductor and the drain electrode of the second metal-oxide-semiconductor, the grid of the grid of described the first metal-oxide-semiconductor and the second metal-oxide-semiconductor is connected with switch control unit, described voltage sample unit sampling power output end magnitude of voltage, and sample voltage value is sent to switch control unit, described switch control unit is controlled the first metal-oxide-semiconductor and the second metal-oxide-semiconductor according to sampled voltage value output signal, make its conducting in turn.
Preferably, when described sample voltage value is greater than the preset value of switch control unit, described switch control unit output signal is turn-offed the first metal-oxide-semiconductor and the second metal-oxide-semiconductor simultaneously.
Preferably, described switch control unit adopts chip microcontroller.
By adopting above technical scheme, the beneficial effects of the utility model are:
(1) adopt metal-oxide-semiconductor as switching tube, reduced conduction loss, improved power-efficient.
(2) can suppress continuous surge pulse.
(3) adopt soft switch technique, reduce costs.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the utility model embodiment surge protection circuit.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
On the contrary, the utility model contain any by claim, defined in marrow of the present utility model and scope, make substitute, modification, equivalent method and scheme.Further, for the public is had a better understanding to the utility model, in below details of the present utility model being described, detailed some specific detail sections of having described.Do not have for a person skilled in the art the description of these detail sections can understand the utility model completely yet.
The surge current of the surge protection circuit of the utility model embodiment for suppressing to produce when power supply is started shooting, also can suppress continuous surge pulse, is particularly useful for high power circuit, can bears continuous impulse impact.
Referring to Fig. 1, the theory diagram of the utility model surge protection circuit 100, comprise the first resistance R 1, the first metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, voltage sample unit 101 and switch control unit 102, one end of the first resistance R 1, the source class S of the source class S of the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 is connected with power input Vin, the other end of the first resistance R 1 is connected as power output end Vout with drain D with the first metal-oxide-semiconductor M1 and the drain D of the second metal-oxide-semiconductor M2, the input of voltage sample unit 101 is connected with power output end Vout, the output of voltage sample unit 101 is connected with the input of switch control unit 102, the grid G of the grid G of the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 is connected with the output of switch control unit 102.The magnitude of voltage that voltage sample unit 101 is held for the Vout that samples, and the magnitude of voltage of employing is sent to switch control unit 102, switch control unit 102 is controlled the shutoff of the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 according to sampled voltage value output signal.
Power input Vin, is generally and exchanges input as input power supply through surge protection circuit 100 output Vout.In power connection moment, the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 are in off state, and surge current is through the first resistance R 1, and this first resistance is surge current suppression effectively.After the normal work of circuit, the first resistance R 1 can increase circuit loss, therefore, the first resistance R 1 be bypassed.When the Vout voltage sample value of voltage sample unit 101 sampling is in default scope, decision circuit is normally worked, switch control unit 102 is controlled pwm pulse according to Vout voltage sample value output signal, according to Vout output voltage in positive half cycle or negative half period, control respectively the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 conducting in turn, thereby the first resistance R 1 is bypassed.
In some application scenario, circuit not only, starting moment generation surge, after normal work, equally also can produce surge, even has continuous surge pulse, and circuit is worked and easily broken down in this state for a long time.Therefore, in this case, surge protection circuit must possess the ability that continuous impulse impacts of bearing.In the present embodiment; when Vout voltage sample value is higher than predeterminated voltage value; judge and have continuous surge pulse; switch control unit 102 output signals are turn-offed the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 simultaneously; allow surge current through the first resistance R 1; effectively suppress continuous surge pulse, protective circuit steady operation.
The gate drive voltage of the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 is pwm pulse signal, by switch control unit 102, according to Vout voltage sample value, is produced.
Switch control unit 102 can be selected a common single-chip microcomputer arbitrarily.
By above technical scheme, adopt a kind of simple circuit structure to realize surge protection, improved response speed and the stability of circuit, greatly reduce cost simultaneously.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (3)
1. a surge protection circuit, it is characterized in that, comprise the first resistance R 1, the first metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, voltage sample unit (101) and switch control unit (102), one end of described the first resistance R 1, the source electrode of the source electrode of described the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 is connected with power input, the other end of described the first resistance R 1 is connected as power output end with the drain electrode of the first metal-oxide-semiconductor M1 and the drain electrode of the second metal-oxide-semiconductor M2, the grid of the grid of described the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 is connected with switch control unit (102), described voltage sample unit (101) sampling power output end magnitude of voltage, and sample voltage value is sent to switch control unit (102), described switch control unit (102) is controlled the first metal-oxide-semiconductor and the second metal-oxide-semiconductor according to sampled voltage value output signal, make its conducting in turn.
2. surge protection circuit according to claim 1; it is characterized in that; when described sample voltage value is greater than the preset value of switch control unit (102), described switch control unit (102) output signal is turn-offed the first metal-oxide-semiconductor and the second metal-oxide-semiconductor simultaneously.
3. surge protection circuit according to claim 1 and 2, is characterized in that, described switch control unit (102) adopts single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320829799.6U CN203722222U (en) | 2013-12-16 | 2013-12-16 | Surge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320829799.6U CN203722222U (en) | 2013-12-16 | 2013-12-16 | Surge protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203722222U true CN203722222U (en) | 2014-07-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320829799.6U Expired - Fee Related CN203722222U (en) | 2013-12-16 | 2013-12-16 | Surge protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203722222U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683239A (en) * | 2013-12-16 | 2014-03-26 | 杭州电子科技大学 | Surge protection circuit |
-
2013
- 2013-12-16 CN CN201320829799.6U patent/CN203722222U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683239A (en) * | 2013-12-16 | 2014-03-26 | 杭州电子科技大学 | Surge protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140716 Termination date: 20151216 |
|
| EXPY | Termination of patent right or utility model |