CN102420419A - Power protection circuit - Google Patents
Power protection circuit Download PDFInfo
- Publication number
- CN102420419A CN102420419A CN2011104317820A CN201110431782A CN102420419A CN 102420419 A CN102420419 A CN 102420419A CN 2011104317820 A CN2011104317820 A CN 2011104317820A CN 201110431782 A CN201110431782 A CN 201110431782A CN 102420419 A CN102420419 A CN 102420419A
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- power
- circuit
- protection circuit
- transient voltage
- parallel
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Abstract
The invention relates to a power protection circuit, which comprises an induction high-voltage protection circuit and a direct-current power supply polarity protection circuit, wherein the induction high-voltage protection circuit comprises at least one piezoresistor RT and at least two transient voltage suppressors TVS1 and TVS2; the piezoresistor RT is connected in parallel to the input side of a power supply; at least one transient voltage suppressor TVS1 is connected in parallel to the input side of the circuit; at least one transient voltage suppressor TVS2 is connected in parallel to the output side of the circuit; the transient voltage suppressor TVS2 is connected in parallel with a capacitor C; the direct-current power polarity protection circuit comprises a direct-current solid relay RS1, two diodes D1 and D2, and a voltage reduction resistor R; and a power positive electrode input end and a power positive electrode output end of the power supply protection circuit are connected with a normally open contact of the direct-current solid relay RS1. The power protection circuit guarantees the correct connection of the polarity of the input power, is low in power consumption and high in reliability and can effectively protect precise elements of the internal circuits, so that the normal and reliable running of equipment of an automatic control system can be guaranteed.
Description
Technical field
The present invention relates to a kind of power protecting circuit, be specifically related to a kind of have DC power supply polarity protection and the circuit of responding to high voltage protective.
Background technology
In the prior art, power protecting circuit uses voltage stabilizing didoe, causes power consumption too big, can not realize big Current Control.Owing to there is not high voltage protection circuit, circuit receives the damage of various surge pulses easily simultaneously.When user's electric power polarity connects inverse time accidentally, the precision components in will badly damaged electronic circuit causes the damage of main equipment.
Summary of the invention
The deficiency that the present invention exists to prior art just provides a kind of power protecting circuit.
The present invention adopts following technological means to solve the problems of the technologies described above: a kind of power protecting circuit; Comprise induction high tension protection circuit and DC power supply polar protective circuit; Said induction high tension protection circuit comprises at least one piezo-resistance RT and at least two Transient Voltage Suppressor TVS1, TVS2; Piezo-resistance RT is connected in parallel on the input side of power supply; At least one Transient Voltage Suppressor TVS1 is connected in parallel on the circuit input side, and at least one Transient Voltage Suppressor TVS2 is connected in parallel on the circuit outlet side, Transient Voltage Suppressor TVS2 shunt capacitance C; Said DC power supply polar protective circuit comprises dc solid-state relay RS1, diode D1 and diode D2 and dropping resistor R, and described circuit power electrode input end, positive source output link to each other with dc solid-state relay RS1 normally opened contact.
Said diode D1 connects with dropping resistor R, the anode connection circuit power cathode input DC-of diode D1, and dropping resistor R links to each other with the cathode output end of dc solid-state relay RS1; The cathode output end of said dc solid-state relay RS1 connects the anode of diode D2, the minus earth of diode D2.
The invention has the beneficial effects as follows: the present invention has realized that a kind of little current circuit protects high-current circuit, and it is low in energy consumption, and reliability is high.Power protecting circuit according to the invention is guaranteed the correct connection of its input electric power polarity, effectively protects the precision components in the internal circuit, thereby guarantees the equipment normal reliable operation in the automatic control system.
Description of drawings
Fig. 1 is power protecting circuit figure of the present invention.
Embodiment
To combine concrete embodiment that content of the present invention is described below.
As shown in Figure 1, be power protecting circuit figure of the present invention.Power protecting circuit of the present invention left side is an input side, and the right side is an outlet side.Described power protecting circuit comprises induction high tension protection circuit and DC power supply polar protective circuit.Said induction high tension protection circuit comprises at least one piezo-resistance RT and at least two Transient Voltage Suppressor TVS1, TVS2; Piezo-resistance RT is connected in parallel on the input side of power supply; Transient Voltage Suppressor TVS1 is connected in parallel on the circuit input side, and Transient Voltage Suppressor TVS2 is connected in parallel on the circuit outlet side, Transient Voltage Suppressor TVS2 shunt capacitance C.
Said DC power supply polar protective circuit comprises dc solid-state relay RS1, diode D1, diode D2 and dropping resistor R.Diode D1 connects with dropping resistor R, the anode connection circuit power cathode input DC-of diode D1, and dropping resistor R links to each other with the cathode output end of dc solid-state relay RS1.The cathode output end of dc solid-state relay RS1 connects the anode of diode D2, the minus earth of diode D2.
Described circuit power electrode input end DC+, positive source output link to each other with dc solid-state relay RS1 normally opened contact; Make input, output end voltage be positioned at a predetermined value; Protective circuit avoids charging into the infringement of voltage; Precision components in the protective circuit is avoided the damage of various inductions effectively.
When the input terminal voltage error-polarity connection, dc solid-state relay RS1 does not work, and has then formed not the loop, the not adhesive of contact of dc solid-state relay RS1, and entire circuit opens circuit.Otherwise when dc solid-state relay RS1 conducting, circuit turn-on correctly connects with this polarity of guaranteeing its input power supply like this.
Claims (2)
1. power protecting circuit; It is characterized in that, comprise induction high tension protection circuit and DC power supply polar protective circuit, said induction high tension protection circuit comprises at least one piezo-resistance RT and at least two Transient Voltage Suppressor TVS1, TVS2; Piezo-resistance RT is connected in parallel on the input side of power supply; At least one Transient Voltage Suppressor TVS1 is connected in parallel on the circuit input side, and at least one Transient Voltage Suppressor TVS2 is connected in parallel on the circuit outlet side, Transient Voltage Suppressor TVS2 shunt capacitance C; Said DC power supply polar protective circuit comprises dc solid-state relay RS1, diode D1 and diode D2 and dropping resistor R, and described circuit power electrode input end, positive source output link to each other with dc solid-state relay RS1 normally opened contact.
2. a kind of power protecting circuit as claimed in claim 1 is characterized in that, said diode D1 connects with dropping resistor R, the anode connection circuit power cathode input DC-of diode D1, and dropping resistor R links to each other with the cathode output end of dc solid-state relay RS1; The cathode output end of said dc solid-state relay RS1 connects the anode of diode D2, the minus earth of diode D2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104317820A CN102420419A (en) | 2011-12-21 | 2011-12-21 | Power protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104317820A CN102420419A (en) | 2011-12-21 | 2011-12-21 | Power protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102420419A true CN102420419A (en) | 2012-04-18 |
Family
ID=45944703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011104317820A Pending CN102420419A (en) | 2011-12-21 | 2011-12-21 | Power protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102420419A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106340868A (en) * | 2016-10-28 | 2017-01-18 | 京东方科技集团股份有限公司 | Circuit protection device, electronic device and electronic equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101615779A (en) * | 2009-04-30 | 2009-12-30 | 上海华魏光纤传感技术有限公司 | A kind of have error-polarity connection of power supply and charge into the circuit of voltage protection |
| CN201388052Y (en) * | 2009-04-07 | 2010-01-20 | 青岛港（集团）有限公司 | Power supply reverse polarity protection device |
| US20100172063A1 (en) * | 2009-01-08 | 2010-07-08 | Zhenning Liu | Methods of improving the lightning immunity for an sspc based aircraft electric power distribution system |
| CN202495749U (en) * | 2011-12-21 | 2012-10-17 | 铜陵浩岩节能科技有限公司 | Power source protection circuit |
-
2011
- 2011-12-21 CN CN2011104317820A patent/CN102420419A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100172063A1 (en) * | 2009-01-08 | 2010-07-08 | Zhenning Liu | Methods of improving the lightning immunity for an sspc based aircraft electric power distribution system |
| CN201388052Y (en) * | 2009-04-07 | 2010-01-20 | 青岛港（集团）有限公司 | Power supply reverse polarity protection device |
| CN101615779A (en) * | 2009-04-30 | 2009-12-30 | 上海华魏光纤传感技术有限公司 | A kind of have error-polarity connection of power supply and charge into the circuit of voltage protection |
| CN202495749U (en) * | 2011-12-21 | 2012-10-17 | 铜陵浩岩节能科技有限公司 | Power source protection circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106340868A (en) * | 2016-10-28 | 2017-01-18 | 京东方科技集团股份有限公司 | Circuit protection device, electronic device and electronic equipment |
| CN106340868B (en) * | 2016-10-28 | 2019-03-01 | 京东方科技集团股份有限公司 | Circuit protection device, electronic device and electronic equipment |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120418 |