CN201813141U - Overvoltage protection circuit - Google Patents
Overvoltage protection circuit Download PDFInfo
- Publication number
- CN201813141U CN201813141U CN2010205547750U CN201020554775U CN201813141U CN 201813141 U CN201813141 U CN 201813141U CN 2010205547750 U CN2010205547750 U CN 2010205547750U CN 201020554775 U CN201020554775 U CN 201020554775U CN 201813141 U CN201813141 U CN 201813141U
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- bridge type
- type unit
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- protection circuit
- alternating current
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Abstract
The utility model relates to the field of electronic circuits, in particular to an overvoltage protection circuit for AC mains supply-driven loads. Specifically, in the overvoltage protection circuit provided by the utility model, a tripper and a rectifier bridge type unit consisting of four diodes are connected to a live wire and a null line of alternating current; a silicon controlled rectifier and a voltage division unit consisting of two series-wound resistors are connected to the output end and rectification earth end of the rectifier bridge type unit; the control electrode of the silicon controlled rectifier is connected between the series-wound resistors by a voltage stabilizing diode and two polar diodes which are connected in series; and the rectification earth end of the rectifier bridge type unit is connected between the voltage stabilizing diode and the two polar diodes by a capacitor. The overvoltage protection circuit consisting of the rectifier bridge type unit, the resistor voltage division unit and the silicon controlled rectifier monitors and protects the voltage of the alternating current, and controls the tripper to switch an alternating current input channel off by a tripper coil in the overvoltage of a load incoming end so as to avoid potential electrical hazards.
Description
Technical field
The utility model relates to electronic circuit field, relates in particular to the overvoltage crowbar of the load of electric main driving.
Background technology
Various electric appliance loads (as refrigerator, television set, air conditioner, computer, hair dryer or the like) by electric main driving work are to be inseparable with people's life.But at the electric appliance load incoming end, only provide access interface, and lack necessary electic protection, have potential safety hazard for electric appliance load as switch on wall, power supply adaptor or socket etc.If when running into short circuit, electric leakage, overcurrent, ground wire electrification or ground wire and disconnecting, damage load easily and the user caused personal injury, also cause electrical fire easily, cause any property loss.
The utility model content
Therefore,, the utility model proposes a kind of rational and effective overvoltage crowbar at the problems referred to above, be arranged at the load incoming end before, be used to protect load, prevent that the overvoltage phenomenon from taking place, and can avoid electric hidden danger.
The utility model adopts following technical scheme:
A kind of overvoltage crowbar; specifically: the rectifying bridge type unit that the live wire of alternating current and zero line insert a release and be made up of 4 diodes; the partial pressure unit that the output of this rectifying bridge type unit and rectification ground termination are gone into a controllable silicon and be made up of the resistance of 2 series connection; the intermediate ends of the resistance of this series connection connects voltage stabilizing didoe and 2 polarity diode to silicon controlleds of series connection and controls the utmost point, and this voltage stabilizing didoe is connected the rectification ground end of an electric capacity to the rectifying bridge type unit with the intermediate ends of polarity diode.
Further, also connect a piezo-resistance between described live wire and the zero line.
Further, also connect a power supply indicating member of forming by diode in series, current-limiting resistance, light-emitting diode between described live wire and the zero line.
The utility model adopts as above technical scheme; overvoltage crowbar by rectifying bridge type unit, electric resistance partial pressure unit and controllable silicon formation; voltage to alternating current carries out monitoring and protection; when the overvoltage phenomenon appears in the load incoming end; disconnect the alternating current input channel by trip coil control release; avoid electric hidden danger, ensured the person and property safety.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Now with embodiment the utility model is further specified in conjunction with the accompanying drawings.
Consult shown in Figure 1; the overvoltage crowbar of present embodiment; specifically: the rectifying bridge type cells D B1 that the live wire L of alternating current and zero line N insert a release TK1 and be made up of 4 diodes; the output of this rectifying bridge type cells D B1 and rectification ground termination is gone into a controllable silicon SCR 1 and by the resistance R 2 of 2 series connection; the partial pressure unit that R3 forms; the resistance R 2 of this series connection; the intermediate ends of R3 connects voltage stabilizing didoe D7 and 2 polarity diode D8 of series connection; D9 is to the control utmost point of controllable silicon SCR 1, and this voltage stabilizing didoe D7 is connected the rectification ground end of a capacitor C 1 to rectifying bridge type cells D B1 with the intermediate ends of polarity diode D8.
Further, also connect a piezo-resistance MOV1 between described live wire L and the zero line N, be used to avoid the surge voltage of live wire L and zero line N, avoid damaging load because of thunderbolt.
Further, also connect a power supply indicating member of forming by diode in series D5, current-limiting resistance R1, light-emitting diode D6 between described live wire L and the zero line N, be used to indicate load to insert the effect of power supply operate as normal.
Overvoltage crowbar of the present utility model is normal at the protected circuit working of load, and the overvoltage crowbar normal power supply takes place in the absence of overvoltage.When load generation overvoltage; voltage behind the rectifying bridge type cells D B1 raises; thereby the dividing potential drop of resistance R 2, R3 end is raise, trigger controllable silicon SCR 1 conducting, make the coil that is connected on the release between live wire L and the controllable silicon SCR 1 have big electric current to flow through; iron core pulling dropout plate in the coil of release TK1; make pull bar break away from the dropout plate, moving contact leaves fixed contact, and this control release TK1 is cut off the electricity supply; avoid casualties, reached the purpose of overvoltage protection.
Although specifically show and introduced the utility model in conjunction with preferred embodiment; but the those skilled in the art should be understood that; in the spirit and scope of the present utility model that do not break away from appended claims and limited; can make various variations to the utility model in the form and details, be protection range of the present utility model.
Claims (3)
1. overvoltage crowbar; it is characterized in that: the rectifying bridge type unit (DB1) that live wire of alternating current (L) and zero line (N) insert a release (TK1) and be made up of 4 diodes; the output of this rectifying bridge type unit (DB1) and rectification ground termination is gone into a controllable silicon (SCR1) and by the resistance (R2 of 2 series connection; R3) partial pressure unit of Zu Chenging; resistance (the R2 of this series connection; R3) intermediate ends connects voltage stabilizing didoe (D7) and 2 polarity diode (D8 of series connection; D9) to the control utmost point of controllable silicon (SCR1), this voltage stabilizing didoe (D7) is connected the rectification ground end of an electric capacity (C1) to rectifying bridge type unit (DB1) with the intermediate ends of polarity diode (D8).
2. overvoltage crowbar according to claim 1 is characterized in that: also connect a piezo-resistance (MOV1) between described live wire (L) and the zero line (N).
3. overvoltage crowbar according to claim 1 is characterized in that: also connect a power supply indicating member of being made up of diode in series (D5), current-limiting resistance (R1), light-emitting diode (D6) between described live wire (L) and the zero line (N).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205547750U CN201813141U (en) | 2010-09-29 | 2010-09-29 | Overvoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205547750U CN201813141U (en) | 2010-09-29 | 2010-09-29 | Overvoltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201813141U true CN201813141U (en) | 2011-04-27 |
Family
ID=43896079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205547750U Expired - Lifetime CN201813141U (en) | 2010-09-29 | 2010-09-29 | Overvoltage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201813141U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103794425A (en) * | 2014-02-20 | 2014-05-14 | 厦门振泰成科技有限公司 | Electric leakage protection device |
| CN103887759A (en) * | 2014-01-27 | 2014-06-25 | 綦升军 | Electric vehicle intelligent fault display protector |
| CN104426122A (en) * | 2013-08-19 | 2015-03-18 | 海洋王（东莞）照明科技有限公司 | Power grid overvoltage protection circuit |
| CN109713767A (en) * | 2017-10-20 | 2019-05-03 | 奥克斯空调股份有限公司 | A kind of charging circuit and convertible frequency air-conditioner with overvoltage crowbar |
-
2010
- 2010-09-29 CN CN2010205547750U patent/CN201813141U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426122A (en) * | 2013-08-19 | 2015-03-18 | 海洋王（东莞）照明科技有限公司 | Power grid overvoltage protection circuit |
| CN104426122B (en) * | 2013-08-19 | 2018-02-02 | 海洋王（东莞）照明科技有限公司 | Power network overvoltage crowbar |
| CN103887759A (en) * | 2014-01-27 | 2014-06-25 | 綦升军 | Electric vehicle intelligent fault display protector |
| CN103794425A (en) * | 2014-02-20 | 2014-05-14 | 厦门振泰成科技有限公司 | Electric leakage protection device |
| CN103794425B (en) * | 2014-02-20 | 2016-08-24 | 厦门振泰成科技有限公司 | Earth leakage protective device |
| CN109713767A (en) * | 2017-10-20 | 2019-05-03 | 奥克斯空调股份有限公司 | A kind of charging circuit and convertible frequency air-conditioner with overvoltage crowbar |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110427 |