CN206023191U - Overvoltage protection circuit - Google Patents
Overvoltage protection circuit Download PDFInfo
- Publication number
- CN206023191U CN206023191U CN201621008251.5U CN201621008251U CN206023191U CN 206023191 U CN206023191 U CN 206023191U CN 201621008251 U CN201621008251 U CN 201621008251U CN 206023191 U CN206023191 U CN 206023191U
- Authority
- CN
- China
- Prior art keywords
- voltage
- coupled
- stable pressure
- resistance
- controllable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 14
- 229910052710 silicon Inorganic materials 0.000 claims description 14
- 239000010703 silicon Substances 0.000 claims description 14
- 230000005611 electricity Effects 0.000 claims description 7
- 238000011084 recovery Methods 0.000 abstract 1
- 230000000087 stabilizing effect Effects 0.000 description 10
- 239000003990 capacitor Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses an overvoltage protection circuit, which comprises an input end and an output end, wherein the input end is used for inputting alternating voltage, and the output end is used for outputting direct voltage; the rectifier module is coupled to the input end and used for converting alternating-current voltage into direct-current voltage; the controllable voltage-stabilizing source is coupled with the rectifying module, and changes the impedance value of the controllable voltage-stabilizing source according to the change situation of the amplitude of the direct-current voltage output by the rectifying module so as to change the output voltage of the controllable voltage-stabilizing source in a step mode; the contactless switch is coupled with the controllable voltage-stabilizing source, and is switched on or switched off according to the step change of the output voltage of the controllable voltage-stabilizing source so as to control the output end to output the direct-current voltage or stop outputting the direct-current voltage. The utility model provides an overvoltage crowbar is applicable to all domestic appliance, auto-power-off when mains voltage is too high, automatic recovery when mains voltage is normal.
Description
Technical field
This utility model is related to overvoltage crowbar, is more particularly to used for the overvoltage crowbar of household electrical appliance.
Background technology
Overvoltage crowbar, is to disconnect its outfan when its input terminal voltage is too high, so as to prevent because of its input electricity
Press through height and have influence on a kind of protection circuit of its outfan.
For example, the patent of existing Publication No. CN203205829U discloses a kind of power supply overvoltage protection circuit, by voltage stabilizing
Control circuit and electric voltage observation circuit are constituted：Controlling circuit of voltage regulation includes voltage stabilizing audion Q1, controlled output audion Q2, resistance
R1, R2, R3, R4, electric capacity C1, electrochemical capacitor C2, C3, the full-wave rectifying circuit of rectifying and voltage-stabilizing diode D1, D2, D3, D4 composition
D, Zener diode D5, relay J, electric capacity C1 and resistance R1 are simultaneously connected between power supply and full-wave rectifying circuit D after connecing, electricity
Solution electric capacity C2 and resistance R2 is serially connected between the colelctor electrode of outfan and voltage stabilizing audion Q1 of full-wave rectifying circuit, electrolysis electricity
The positive pole for holding C2 connects the base stage of voltage stabilizing audion Q1, and the positive pole of Zener diode D5 is connected to the base stage of voltage stabilizing audion Q1,
Negative pole is connected to the outfan of rectification circuit, electrochemical capacitor C3 be attempted by voltage stabilizing audion Q1 emitter stage and rectification circuit it
Between, relay J is connected between the colelctor electrode of the emitter stage of voltage stabilizing audion Q1 and controlled output audion Q2, relay normal
Closed contact J2 is connected with power supply, and resistance R4 is connected between the base stage of controlled output audion Q2 and emitter stage, resistance R3 one end
The base stage of controlled output audion Q2 is connected to, the other end is connected with the outfan of electric voltage observation circuit；Electric voltage observation circuit bag
Include audion Q3, resistance R5, R6, R7, R8, electrochemical capacitor C4, commutation diode D6, Zener diode D7, photoelectrical coupler G,
Resistance R5 and commutation diode D6, resistance R8 are serially connected between the input of power supply and photoelectrical coupler G, photoelectrical coupler G's
Input is connected with the colelctor electrode of audion Q3, is attempted by the negative pole of commutation diode D6 after resistance R6, R7 concatenation with electric capacity C4
With the positive pole of Zener diode D7, the negative pole connecting triode Q3 emitter stages of commutation diode D7.
Overvoltage crowbar in above-mentioned patent, makes appliance cut-off by relay, but the actuating of relay belongs to machinery
Action, is easily damaged as use time increases.
Utility model content
The purpose of this utility model is to provide a kind of overvoltage crowbar, it is adaptable to all household electrical appliance, when civil power electricity
Automatically power off when pressing through high, recover when line voltage is normal automatically.
Above-mentioned purpose of the present utility model technical scheme is that.
A kind of overvoltage crowbar, including input and outfan, the input is used for input ac voltage, described defeated
Going out end is used for exporting DC voltage；
Also include rectification module, controllable source of stable pressure, noncontacting switch,
The rectification module is coupled to input, for alternating voltage is converted into DC voltage；
The controllable source of stable pressure is coupled to rectification module, according to the change feelings of the DC voltage amplitude exported by rectification module
Condition changes its own resistance value, to change its output voltage stepwise；
The noncontacting switch is coupled to controllable source of stable pressure, according to the phase step type change conducting of controllable source of stable pressure output voltage
Or cut-off, DC voltage is exported with control output end or stops output DC voltage.
By taking above-mentioned technical proposal, due to most of household electrical appliance, all can not directly using civil power, need to be by which
It is converted into use after unidirectional current, the overvoltage crowbar provided by such scheme, is for alternating current is changed into direct current
This link of electricity, being different from background technology is used for alternating current transmission by power supply overvoltage protection circuit；In addition, such scheme
It is controlled using noncontacting switch, mechanical action, thus with longer service life.
Preferred technical scheme：The controllable source of stable pressure include being parallel to the tie point of rectification module outlet side, second
Branch road and the 3rd branch road,
The tie point includes resistance R1, resistance R2 and the resistance R3 being sequentially connected in series；
Second branch road includes resistance R4, the resistance R5 being sequentially connected in series and the controllable source of stable pressure；
3rd branch road includes the electric capacity C1 being sequentially connected in series and the noncontacting switch；
The reference pole of wherein described controllable source of stable pressure is coupled to the common junction of resistance R2 and resistance R3, described contactless opens
The negative electrode that control pole is coupled to controllable source of stable pressure is closed, the two ends of the electric capacity C1 are the outfan, for exporting DC voltage.
By taking above-mentioned technical proposal, partial pressure is carried out to the DC voltage of rectification module outlet side using tie point,
When line voltage changes, the DC voltage of rectification module outlet side also changes, and is embodied by tie point；In second branch road
Controllable source of stable pressure change with the change of the DC voltage of rectification module outlet side, and in the output stage of controllable source of stable pressure produce
Raw pulse voltage；Noncontacting switch in 3rd branch road in response to the pulse voltage signal on and off, so as to control the 3rd
Branch road path or open circuit, make outfan output DC voltage or stop output DC voltage.
Preferred technical scheme：The controllable source of stable pressure is chip TL431, and which refers to pole with its negative electrode also by feedback electricity
Hold C2 connections.
By taking above-mentioned technical proposal, TL431 can be adopted as controllable source of stable pressure, and add feedback capacity, be played steady
It is set for using.
Preferred technical scheme：3rd branch road also includes the electric capacity C3 in parallel with controllable source of stable pressure.
By taking above-mentioned technical proposal, when the voltage of controllable voltage stabilizing source output terminal changes, electric capacity C3 plays buffering
Effect.
Preferred technical scheme：The noncontacting switch is controllable silicon, and the silicon controlled control pole is by two pole of voltage stabilizing
Pipe D1 is coupled to the negative electrode of controllable source of stable pressure, and wherein, the anode of Zener diode D1 is coupled to silicon controlled control pole, voltage stabilizing two
The negative electrode of pole pipe D1 is coupled to the negative electrode of controllable source of stable pressure.
By taking above-mentioned technical proposal, take Zener diode D1 that silicon controlled control pole can be prevented over-pressed suddenly.
Description of the drawings
Fig. 1 is the schematic diagram of overvoltage crowbar.
In figure, U1, rectification module；100th, tie point；200th, the second branch road；300th, the 3rd branch road.
Specific embodiment
This utility model is described in further detail below in conjunction with accompanying drawing.
With reference to Fig. 1, a kind of overvoltage crowbar, including rectification module U1, tie point 100, the second branch road 200 and the 3rd
Branch road 300, wherein, tie point 100, the second branch road 200 and the 3rd branch road 300 are parallel to the output of rectification module U1 respectively
Side.
Wherein, tie point 100 includes resistance R1, resistance R2 and the resistance R3 being sequentially connected in series；
In tie point 100, resistance R1, resistance R2 and resistance R3 constitute one can be with the pressure regulation list of modulation voltage
Line voltage is converted into DC voltage by unit, rectification module U1, and 100 pairs of DC voltages of tie point are adjusted and in resistance
The common junction output of R2 and resistance R3；To sum up the voltage swing of the output of tie point 100 is positively correlated with line voltage.
Wherein, the second branch road 200 includes resistance R4, resistance R5 and the chip TL431 being sequentially connected in series；Additionally, chip TL431
Reference pole be connected also by electric capacity C2 with negative electrode；
In the second branch road 200, chip TL431 is worked as follows：When 2.5V is more than with reference to pole tension, chip TL431 is certainly
Body impedance very little, the anode potential of chip TL431 are close to cathode potential；When 2.5V is less than with reference to pole tension, chip TL431
Direct impedance is very big, and the anode of chip TL431 has certain voltage with negative electrode；Therefore, when line voltage is excessive, chip is made
TL431 is close to more than 2.5V, the anode potential of chip TL431 and cathode potential with reference to the voltage that pole receives, and makes chip TL431
The current potential that negative electrode is produced is relatively low, when line voltage is normal, makes chip TL431 be less than 2.5V, chip with reference to the voltage that pole receives
There is certain voltage with negative electrode in the anode of TL431, the current potential for producing chip TL431 negative electrodes is higher；To sum up with line voltage
Change, the electric potential signal from the output of the second branch road 200 is in phase step type.
Wherein, the 3rd branch road 300 includes that controllable silicon SCR, the control pole of controllable silicon SCR are coupled to the negative electrode of chip TL431；
In the 3rd branch road 300, as controllable silicon SCR is by electric pulse（The electric potential signal of phase step type）Triggering, therefore,
Whenever the output of the second branch road 200 electric potential signal by high potential saltus step into electronegative potential when, i.e. line voltage is by normally becoming too high
When, controllable silicon SCR is ended, and the 3rd branch road 300 that controllable silicon SCR is located is opened a way, and outfan provides DC voltage without normal load,
Whenever the second branch road 200 output electric potential signal by electronegative potential saltus step into high potential when, i.e., line voltage becomes normal by too high
When, controllable silicon SCR is turned on, and the open circuit path of the 3rd branch road 300 that controllable silicon SCR is located, outfan can provide unidirectional current to load
Pressure；To sum up, when line voltage is too high, outfan stops output DC voltage, and when line voltage is normal, it is straight that outfan starts output
Stream voltage.
In addition, the input side in rectification module U1 is also coupled with current insurance silk FUSE and varistor RV successively, wherein
Current insurance silk FUSE is preposition in varistor RV, and this is to compare usual anti-surge circuit in current household electrical appliance, herein not
Its operation principle is repeated again.
This specific embodiment is only which is not to restriction of the present utility model, ability to explanation of the present utility model
Field technique personnel can make the modification without creative contribution after this specification is read as needed to the present embodiment, but
As long as all being protected by Patent Law in right of the present utility model.
Claims (5)
1. a kind of overvoltage crowbar, including input and outfan, it is characterised in that the input is used for input AC electricity
Pressure, the outfan are used for exporting DC voltage；
Also include rectification module (U1), controllable source of stable pressure, noncontacting switch,
Rectification module (U1) is coupled to input, for alternating voltage is converted into DC voltage；
The controllable source of stable pressure is coupled to rectification module (U1), according to the change of the DC voltage amplitude exported by rectification module (U1)
Change situation changes its own resistance value, to change its output voltage stepwise；
The noncontacting switch is coupled to controllable source of stable pressure, turns on according to the phase step type change of controllable source of stable pressure output voltage or cuts
Only, DC voltage is exported with control output end or stops output DC voltage.
2. overvoltage crowbar according to claim 1, it is characterised in that the controllable source of stable pressure includes being parallel to rectification
The tie point (100) of module (U1) outlet side, the second branch road (200) and the 3rd branch road (300),
Described tie point (100) include resistance R1, resistance R2 and the resistance R3 being sequentially connected in series；
Described second branch road (200) include resistance R4, the resistance R5 being sequentially connected in series and the controllable source of stable pressure；
3rd branch road (300) includes the electric capacity C1 being sequentially connected in series and the noncontacting switch；
The reference pole of wherein described controllable source of stable pressure is coupled to the common junction of resistance R2 and resistance R3, the noncontacting switch control
Pole processed is coupled to the negative electrode of controllable source of stable pressure, and the two ends of the electric capacity C1 are the outfan, for exporting DC voltage.
3. overvoltage crowbar according to claim 2, it is characterised in that the controllable source of stable pressure is chip TL431, its
It is connected also by feedback capacity C2 with its negative electrode with reference to pole.
4. overvoltage crowbar according to claim 2, it is characterised in that controllable steady in the 3rd branch road (300)
Potential source is also parallel with electric capacity C3.
5. overvoltage crowbar according to claim 2, it is characterised in that the noncontacting switch is controllable silicon, described
Silicon controlled control pole is coupled to the negative electrode of controllable source of stable pressure by Zener diode D1, wherein, the anode of Zener diode D1
Silicon controlled control pole is coupled to, the negative electrode of Zener diode D1 is coupled to the negative electrode of controllable source of stable pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621008251.5U CN206023191U (en) | 2016-08-31 | 2016-08-31 | Overvoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621008251.5U CN206023191U (en) | 2016-08-31 | 2016-08-31 | Overvoltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206023191U true CN206023191U (en) | 2017-03-15 |
Family
ID=58256067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621008251.5U Expired - Fee Related CN206023191U (en) | 2016-08-31 | 2016-08-31 | Overvoltage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206023191U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107658843A (en) * | 2017-10-23 | 2018-02-02 | 江西美的贵雅照明有限公司 | Overvoltage crowbar and light fixture |
| CN107769186A (en) * | 2017-11-29 | 2018-03-06 | 深圳微步信息股份有限公司 | A kind of protection circuit of direct current supply |
-
2016
- 2016-08-31 CN CN201621008251.5U patent/CN206023191U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107658843A (en) * | 2017-10-23 | 2018-02-02 | 江西美的贵雅照明有限公司 | Overvoltage crowbar and light fixture |
| CN107658843B (en) * | 2017-10-23 | 2023-11-14 | 美智光电科技股份有限公司 | Overvoltage protection circuit and lamp |
| CN107769186A (en) * | 2017-11-29 | 2018-03-06 | 深圳微步信息股份有限公司 | A kind of protection circuit of direct current supply |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206023191U (en) | Overvoltage protection circuit | |
| CN101267123B (en) | An efficient voltage regulating power | |
| CN106533144B (en) | Anti-reverse and current flowing backwards circuit | |
| CN101656482B (en) | Three-phase rectifier electrifying device | |
| CN106099842A (en) | A kind of reversal connection or short-circuit protection circuit | |
| CN101895216B (en) | State switching circuit of wide-voltage switch | |
| CN208352968U (en) | A kind of PFC overvoltage crowbar and device | |
| CN201266919Y (en) | Power supply circuit of proximity switch | |
| CN202797873U (en) | Light-emitting diode (LED) short-circuit protection circuit | |
| CN204666713U (en) | The detection of generator amature superpotential action and protection circuit | |
| CN204331523U (en) | Voltage-regulating circuit | |
| CN107645180A (en) | A kind of low starting current power-supply circuit for cable monitoring | |
| CN204721240U (en) | Switching power supply circuit | |
| CN208272948U (en) | A kind of single fiery, the adaptive road 1-3 Internet of Things intelligent switch of zero fire | |
| CN106783401A (en) | A kind of energy-saving resistance-capacitance depressurization relay drive circuit | |
| CN201717796U (en) | Wide voltage switch state converting circuit | |
| CN206498338U (en) | Modified Switching Power Supply input circuit | |
| CN101867309A (en) | Univoltage switch status conversion circuit | |
| CN202405740U (en) | Current-limiting protection circuit of alternating current power supply loop | |
| CN201444515U (en) | Device for controlling intelligent on-off of power source and power supply socket | |
| CN204992520U (en) | Resume power supply protection device | |
| CN203522530U (en) | Contactor power supply circuit of grid-connected inversion circuit | |
| CN103095118A (en) | Self-generation power supply | |
| CN212412833U (en) | Protection circuit based on UPS uninterrupted power source starts in twinkling of an eye | |
| CN217563383U (en) | Low-power consumption standby circuit |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170315 Termination date: 20190831 |