CN2538087Y - Power overvoltage protective instrument circuit - Google Patents
Power overvoltage protective instrument circuit Download PDFInfo
- Publication number
- CN2538087Y CN2538087Y CN 02219806 CN02219806U CN2538087Y CN 2538087 Y CN2538087 Y CN 2538087Y CN 02219806 CN02219806 CN 02219806 CN 02219806 U CN02219806 U CN 02219806U CN 2538087 Y CN2538087 Y CN 2538087Y
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- circuit
- power
- voltage
- overvoltage
- resistance
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- Expired - Fee Related
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Abstract
The utility model relates to an over-voltage protection power gauge circuit, which comprises an AC (alternative current) power circuit 3 and a main circuit 4, and is characterized in that: an input end of the AC power circuit 3 is connected in serial with a positive temperature coefficient thermal sensitive resistance 1, and both ends of the power of after the positive temperature coefficient thermal sensitive resistance 1 are connected in parallel with an over-voltage protector 2. When voltage is too high, the over-voltage protector is electrified, the current flows in the positive temperature coefficient thermal sensitive resistance is raised, and the resistance is dramatically enhanced, which inhibits the increase of the current, thereby protecting the post-stage circuit without damaging the over-voltage protector. The utility model can ensure that the gauge normally works for a short period and then in a protection status even when the supplying voltage is more than AC 300V without damaging any elements in the gauge.
Description
Technical field: the utility model relates to a kind of power supply overvoltage protection appliance circuit.Belong to electronic technology field.
Background technology: because present domestic grid supply quality is not high, general normal power supply voltage is AC220V.By fluctuation ± 20%; scope is AC176～264V; and in fact high terminal voltage may reach AC280～290V; the area that has sometimes even can surpass AC300V; will be subjected to the danger of overvoltage like this for the various instrument of using mains-supplied; thereby cause protective device (as fuse) to damage, even damage internal circuit.
Summary of the invention: the purpose of this utility model is to provide a kind of can make instrument be in guard mode when supply voltage is too high and power supply overvoltage protection appliance circuit that self does not damage.Technology contents of the present utility model is: a kind of power supply overvoltage protection appliance circuit; comprise AC power circuit and main circuit; be characterized at the input of the AC power circuit semistor of connecting the overvoltage protector in parallel of the both ends of power behind semistor.Its principle is when overtension (big the overvoltage protector conducting voltage upper limit), the overvoltage protector conducting, and the electrorheological that flows through semistor is big, and resistance value increases rapidly, has suppressed the electric current increase, has protected late-class circuit, self does not damage again simultaneously.The utility model can make instrument still can operate as normal a period of time then be in guard mode when the above power voltage supply of AC300V, and gauge internal is without any component wear.
Description of drawings
Fig. 1 is embodiment circuit theory diagrams of the present utility model
Embodiment:
The utility model is a kind of power supply overvoltage protection appliance circuit.Comprise AC power circuit 3 and main circuit 4, at the input of AC power circuit 3 semistor (PTC) 1 of connecting, the overvoltage protector 2 in parallel of the both ends of power behind semistor 1.The utility model mainly contains three kinds of combinations.
Embodiment 1: overvoltage protector 2 is a piezo-resistance, and semistor 1 is a ceramic resistor.Be applicable to the instrument that power consumption is lower.Its principle is when overtension (greater than the piezo-resistance conducting voltage); the piezo-resistance conducting; back step voltage maintains the conducting voltage of piezo-resistance; the increase of pressure reduction makes that the electrorheological that flows through PTC resistance is big; cause PTC resistance temperature rising resistance to become big; suppressed the electric current increase conversely; reached the balance of heat with electric current; this moment, instrument can also work on; when voltage continues to rise to a certain degree, the PTC resistance further increases, and electric current diminishes; instrument cisco unity malfunction and be in guard mode, this moment, gauge internal did not have any component wear.
Embodiment 2: overvoltage protector 2 suppresses thyristor for transient overvoltage, and semistor 1 is the semiconductor high molecule electric resistance.Be applicable to the instrument that power consumption is higher.Transient overvoltage suppressed thyristor conducting (pressure drop is 5V to the maximum) when its operation principle was overvoltage; protected late-class circuit; the electric current that flows through PTC resistance is sharply increased and resistance increases rapidly, suppressed the increase of electric current conversely, thereby protected the circuit of PTC resistance and back.
Embodiment 3: overvoltage protector 2 suppresses thyristor for transient overvoltage, and semistor 1 is a ceramic resistor.Be applicable to that power consumption is between example 1,2 instrument between the two.Operation principle is with example 2.
Claims (4)
1, a kind of power supply overvoltage protection appliance circuit; comprise AC power circuit (3) and main circuit (4); it is characterized in that at the input of AC power circuit (3) semistor (1) of connecting the overvoltage protector (2) in parallel of the both ends of power behind semistor (1).
2, a kind of power supply overvoltage protection appliance circuit according to claim 1 is characterized in that overvoltage protector (2) is piezo-resistance, and semistor (1) is a ceramic resistor.
3, a kind of power supply overvoltage protection appliance circuit according to claim 1 is characterized in that overvoltage protector (2) suppresses thyristor for transient overvoltage, and semistor (1) is the semiconductor high molecule electric resistance.
4, a kind of power supply overvoltage protection appliance circuit according to claim 1 is characterized in that overvoltage protector (2) suppresses thyristor for transient overvoltage, and semistor (1) is a ceramic resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02219806 CN2538087Y (en) | 2002-04-04 | 2002-04-04 | Power overvoltage protective instrument circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02219806 CN2538087Y (en) | 2002-04-04 | 2002-04-04 | Power overvoltage protective instrument circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2538087Y true CN2538087Y (en) | 2003-02-26 |
Family
ID=33698226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02219806 Expired - Fee Related CN2538087Y (en) | 2002-04-04 | 2002-04-04 | Power overvoltage protective instrument circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2538087Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102394495A (en) * | 2011-10-09 | 2012-03-28 | 杭州乾龙电器有限公司 | Dynamic thermal protection type overvoltage protector |
| CN107565510A (en) * | 2017-10-25 | 2018-01-09 | 上海长园维安电子线路保护有限公司 | A kind of circuit protecting device with excessively stream and over-voltage protecting function |
| CN110336264A (en) * | 2019-08-22 | 2019-10-15 | 成都铁达电子股份有限公司 | A kind of pressure limiting circuit |
-
2002
- 2002-04-04 CN CN 02219806 patent/CN2538087Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102394495A (en) * | 2011-10-09 | 2012-03-28 | 杭州乾龙电器有限公司 | Dynamic thermal protection type overvoltage protector |
| CN107565510A (en) * | 2017-10-25 | 2018-01-09 | 上海长园维安电子线路保护有限公司 | A kind of circuit protecting device with excessively stream and over-voltage protecting function |
| CN110336264A (en) * | 2019-08-22 | 2019-10-15 | 成都铁达电子股份有限公司 | A kind of pressure limiting circuit |
| CN110336264B (en) * | 2019-08-22 | 2024-01-26 | 成都铁达电子股份有限公司 | Voltage limiting circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: JIANGSU SFERE ELECTRIC CO., LTD. Free format text: FORMER NAME: SIFEIER ELECTRIC METER CO., LTD., JIANGYIN CITY |
|
| CP03 | Change of name, title or address |
Address after: 214434 No. 99 East Chengjiang Road, Jiangsu, Jiangyin Patentee after: Jiangyin Sfere Electric Co., Ltd. Address before: 214431 Binjiang Middle Road, Jiangsu, China, No. 275, No. Patentee before: Changjiang Sifil Power Instrument Co., Ltd., Jiangying City |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20030226 Termination date: 20110404 |