CN201001023Y - Power supply protective circuit of apparatus instrument - Google Patents
Power supply protective circuit of apparatus instrument Download PDFInfo
- Publication number
- CN201001023Y CN201001023Y CNU2007200663147U CN200720066314U CN201001023Y CN 201001023 Y CN201001023 Y CN 201001023Y CN U2007200663147 U CNU2007200663147 U CN U2007200663147U CN 200720066314 U CN200720066314 U CN 200720066314U CN 201001023 Y CN201001023 Y CN 201001023Y
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- China
- Prior art keywords
- instrument
- circuit
- protection
- meter
- power
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- Expired - Fee Related
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Abstract
The utility model discloses an instrument meter power protection circuit. The utility model is characterized in that the input end of an alternating current power is connected with a safety fuse in series, a discharge resistance, a voltage dependent resistor and a capacitance are connected in parallel in turn behind the safety fuse, a negative temperature coefficient thermistor is connected in series, a common-mode inductance is connected in parallel, an alternating current power circuit and an instrument meter main circuit are connected behind the capacitance. The design of the utility model is reasonable, the structure is simple, the short circuit protection of the instrument meter self short circuit protection, the electric network over-voltage protection, the electric network surge voltage and the electrical fast train pulse conduction interference suppression, the conduction disturbance suppression of the electric network from the instrument meter, and the safeguard protection can be realized.
Description
Technical field
The utility model relates to measuring and controlling instrument instruments and meters class, specifically a kind of instrument and meter power protecting circuit.
Background technology
Because power supply grid unavoidably exists destruction and disturbing factors such as overvoltage, thunderbolt, surge, electric fast-pulse group, thereby influences the operate as normal of instrument and meter.Usual way is power supply input circuit series connection fuse, in parallel pressure-sensitive, the film inductor altogether of connecting.200520046493.9 of utility model patents improve on the basis of the above, at electric current input source loop series connection semistor, its objective is that (1) suppresses surge current; (2) when causing the piezo-resistance protection, electric voltage over press moves limiting protecting electric current (electric current amplification → semistor heating → thermistor resistance amplification → electric current reduces).The deficiency of this circuit is: generally can not allow the electrical network sustained overvoltage because electrical network becomes the existence of distribution automatic protective system, therefore, the possibility of electrical network sustained overvoltage is minimum, often has of short duration overvoltage (as thunderbolt surge or electric fast-pulse group).The effect of piezo-resistance is exactly to be used for absorbing the of short duration overvoltage of electrical network specially; and semistor is to be used for measuring temperature specially or to do overcurrent protection; semistor as overcurrent protection is called resettable fuse again, and obviously thermistor can not be used as overvoltage protection.In the embodiment of patent 200520046493.9, when the electrical network overvoltage, piezo-resistance action (conducting), then line voltage is born by thermistor, obviously, and when line voltage is higher than thermistor when withstand voltage, can cause the thermistor punch through damage, thus the meaning of losing.
Summary of the invention
The purpose of this utility model is a kind of instrument and meter power protecting circuit that provides at the deficiencies in the prior art, and it can be realized: instrument and meter faults itself short-circuit protection; The electrical network overvoltage protection; Instrument and meter start surge current suppresses protection; Electrical network surge voltage and electricity dash group's conducted interference fast to be suppressed; Instrument and meter suppresses the conduction interference of electrical network; Safeguard protection.
The purpose of this utility model is achieved in that
A kind of instrument and meter power protecting circuit; characteristics are at ac power input end serial connection fuse 1; parallel discharge resistance 9, piezo-resistance 2, electric capacity 3 successively after the fuse 1; be connected in series negative tempperature coefficient thermistor 4 again and ally the communists film inductor 5 or elder generation and the film inductor 5 of allying the communists, be connected in series negative tempperature coefficient thermistor 4 again, thereafter and connect electric capacity 6 and connect AC power circuit 7, instrument and meter main circuit 8.
Be connected AC power circuit 7, instrument and meter main circuit 8 again behind shunt capacitance 10, the electric capacity 11 respectively between described electric capacity 6 two ends and the AC power input grounding end.
The utility model is reasonable in design, and is simple in structure, can realize: 1. instrument and meter faults itself short-circuit protection; 2. electrical network overvoltage protection; 3. instrument and meter start surge current suppresses protection; 4. electrical network surge voltage and electricity dash the inhibition of group's conducted interference fast; 5. instrument and meter suppresses the conduction interference of electrical network; 6. safeguard protection.
Description of drawings
Fig. 1 is the utility model structural representation
Fig. 2 is another embodiment schematic diagram of the utility model
Embodiment
Consult Fig. 1, need not the instrument and meter of ground connection (as plastic casing) for shell, the utility model is at ac power input end serial connection fuse 1, parallel discharge resistance 9, piezo-resistance 2, electric capacity 3 successively after the fuse 1, be connected in series negative tempperature coefficient thermistor 4 again and film inductor 5 or the electric capacity 3 of allying the communists after elder generation and the film inductor 5 of allying the communists be connected in series negative tempperature coefficient thermistor 4 back shunt capacitances 6 again, connect AC power circuit 7, instrument and meter main circuit 8 then.
Consult Fig. 2, needing the instrument and meter of ground connection, the utility model for shell is to be connected AC power circuit 7, instrument and meter circuit 8 again behind shunt capacitance 10, the electric capacity 11 respectively between electric capacity 6 two ends and the AC power input grounding end.
The effect of each components and parts in the utility model: general insurance silk 1 is used for the protection of instrument and meter failed shorted; Piezo-resistance 2 is used for that the electrical network overvoltage protection is also absorbed electrical network surge or electric fast-pulse group simultaneously and disturbs; Differential mode interference absorption electric capacity 3 is used to absorb Disturbance in Power Net and instrument and meter is harassed electrical network; Negative tempperature coefficient thermistor 4 because the surge impact electric current that AC power circuit rectifying and wave-filtering electric capacity causes is protected the rectifying device in the AC power circuit, suppresses the rush of current to electrical network when being used for suppressing the instrument and meter start simultaneously; Be total to film inductor 5, its common film component inductance suppresses the common film interference of electrical network, and its difference film leakage inductance suppresses the poor film interference of electrical network; Absorb electric capacity 6, be used to absorb electrical network difference film and disturb; AC power circuit 7 provides power supply for instrument and meter; The 8th, the instrument and meter main circuit; Discharge resistance 9 is used for instrument and meter shutdown back electric capacity 3,6,10,11 is discharged to guarantee personal safety; 10, the 11st, common film disturbs and absorbs electric capacity; L, N, G are respectively AC power live wire, zero line and earth connection.
Claims (2)
1, a kind of instrument and meter power protecting circuit; it is characterized in that at ac power input end serial connection fuse (1); fuse (1) is parallel discharge resistance (9), piezo-resistance (2), electric capacity (3) successively afterwards; be connected in series negative tempperature coefficient thermistor (4) and the film inductor of allying the communists (5) or elder generation and the film inductor of allying the communists (5) again, be connected in series negative tempperature coefficient thermistor (4) again, thereafter and connect electric capacity (6), connect AC power circuit (7), instrument and meter main circuit (8).
2, instrument and meter power protecting circuit according to claim 1 is characterized in that being connected AC power circuit (7), instrument and meter main circuit (8) again behind shunt capacitance (10), (11) respectively between electric capacity (6) two ends and the AC power input grounding end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200663147U CN201001023Y (en) | 2007-01-15 | 2007-01-15 | Power supply protective circuit of apparatus instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200663147U CN201001023Y (en) | 2007-01-15 | 2007-01-15 | Power supply protective circuit of apparatus instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201001023Y true CN201001023Y (en) | 2008-01-02 |
Family
ID=39015426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200663147U Expired - Fee Related CN201001023Y (en) | 2007-01-15 | 2007-01-15 | Power supply protective circuit of apparatus instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201001023Y (en) |
Cited By (8)
| 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 |
| CN102510042A (en) * | 2011-11-04 | 2012-06-20 | 四川省电力公司内江电业局 | Power supply protection device for acquisition terminal |
| CN104600686A (en) * | 2015-01-05 | 2015-05-06 | 中国科学院等离子体物理研究所 | Overvoltage short-circuit protection device |
| CN106451366A (en) * | 2016-10-21 | 2017-02-22 | 成都前锋电子仪器有限责任公司 | Voltage input protection circuit |
| WO2019004876A1 (en) * | 2017-06-29 | 2019-01-03 | Общество С Ограниченной Ответственностью "Свердловэлектро-Силовые Трансформаторы" (Ооо "Свэл-Силовые Трансформаторы") | Safety device |
| CN112188688A (en) * | 2020-09-09 | 2021-01-05 | 高达文科技控股有限公司 | LED lamp |
| CN114498571A (en) * | 2022-04-15 | 2022-05-13 | 天津光电惠高电子有限公司 | Power battery charger fault protection device and use method |
| CN114552557A (en) * | 2022-02-28 | 2022-05-27 | 江西增鑫科技股份有限公司 | Power supply surge protector |
-
2007
- 2007-01-15 CN CNU2007200663147U patent/CN201001023Y/en not_active Expired - Fee Related
Cited By (10)
| 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 |
| CN102510042A (en) * | 2011-11-04 | 2012-06-20 | 四川省电力公司内江电业局 | Power supply protection device for acquisition terminal |
| CN104600686A (en) * | 2015-01-05 | 2015-05-06 | 中国科学院等离子体物理研究所 | Overvoltage short-circuit protection device |
| CN106451366A (en) * | 2016-10-21 | 2017-02-22 | 成都前锋电子仪器有限责任公司 | Voltage input protection circuit |
| CN106451366B (en) * | 2016-10-21 | 2019-02-05 | 成都前锋电子仪器有限责任公司 | A kind of voltage input protection circuit |
| WO2019004876A1 (en) * | 2017-06-29 | 2019-01-03 | Общество С Ограниченной Ответственностью "Свердловэлектро-Силовые Трансформаторы" (Ооо "Свэл-Силовые Трансформаторы") | Safety device |
| EA036803B1 (en) * | 2017-06-29 | 2020-12-22 | Общество С Ограниченной Ответственностью "Свердловэлектро-Силовые Трансформаторы" (Ооо "Свэл-Силовые Трансформаторы") | Safety device |
| CN112188688A (en) * | 2020-09-09 | 2021-01-05 | 高达文科技控股有限公司 | LED lamp |
| CN114552557A (en) * | 2022-02-28 | 2022-05-27 | 江西增鑫科技股份有限公司 | Power supply surge protector |
| CN114498571A (en) * | 2022-04-15 | 2022-05-13 | 天津光电惠高电子有限公司 | Power battery charger fault protection device and use method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080102 Termination date: 20110115 |