CN102097788A - Protection circuit of storage capacitor - Google Patents
Protection circuit of storage capacitor Download PDFInfo
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- CN102097788A CN102097788A CN2010105789928A CN201010578992A CN102097788A CN 102097788 A CN102097788 A CN 102097788A CN 2010105789928 A CN2010105789928 A CN 2010105789928A CN 201010578992 A CN201010578992 A CN 201010578992A CN 102097788 A CN102097788 A CN 102097788A
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Abstract
The invention provides a protection circuit of a storage capacitor, and relates to the electricity field. The protection circuit is used for solving the protection problem of a high-capacity storage capacitor, and comprises a rectifying circuit and the storage capacitor, wherein the rectifying circuit is connected with an alternating current (AC) input end; the storage capacitor is connected with an direct current (DC) output end; an overvoltage protection circuit for the storage capacitor is connected between the rectifying circuit and the storage capacitor in parallel and comprises a relay with a normally open contact and a normally closed contact, a first voltage-regulator diode, a second voltage-regulator diode and a current-limiting resistor; the normally closed contact of the relay is connected between the output of the rectifying circuit and the positive pole of the storage capacitor in series; the normally open contact of the relay is connected with a circuit in series, and the circuit comprises the current-limiting resistor and the second voltage-regulator diode; the first voltage-regulator diode is connected with a circuit in parallel, and the circuit comprises the current-limiting resistor and the normally open contact of the relay; the positive pole of the second voltage-regulator diode is connected with the current-limiting resistor and the negative pole of the first voltage-regulator diode; and the negative pole is connected with the positive pole of the storage capacitor. The protection circuit can realize the overvoltage protection for the storage capacitor.
Description
Technical field
The present invention relates to a kind of energy storage capacitor, further, relate to a kind of protective circuit of storage capacitor.
Background technology
At present, in power distribution net operation mechanism, operating power is generally direct current, because the moment of operating mechanism action needs very big energy (several amperes even tens amperes), often uses big capacity storage capacitor to store energy needed, traditional implementation method is directly to charge to electric capacity after the AC rectification, owing to do not add necessary protective circuit, when electric capacity charged, electric current was very big, caused sky to open the mistake tripping easily; , easily commutating circuit is burnt out during stuck even short circuit when operating mechanism; And when the electric voltage exception rising surpasses the rated voltage of electric capacity, the serious accident of electric capacity bleed off even blast may appear.
Summary of the invention
Key the present invention is in order to address the above problem herein; a kind of storage capacitor protective circuit is provided; it has very little leakage current when operate as normal; substantially do not consume capacitive energy; and when electric voltage exception raises; can realize overvoltage protection, bleed off, the explosion hazard of avoiding the electric capacity overvoltage to cause to storage capacitor.
For addressing the above problem, the technical solution used in the present invention is as follows:
A kind of storage capacitor protective circuit; comprise rectification circuit that is connected ac input end and the storage capacitor that is connected dc output end; a storage capacitor overvoltage crowbar in parallel between rectification circuit and storage capacitor; described storage capacitor overvoltage crowbar is by the relay with normal opened contact and normally closed contact; first voltage stabilizing didoe; second voltage stabilizing didoe and current-limiting resistance are formed; the normally closed contact of described relay is connected between the positive pole of the output of rectification circuit and storage capacitor; the normal opened contact of described relay is connected on the circuit of being made up of the current-limiting resistance and second voltage stabilizing didoe; first voltage stabilizing didoe is connected in parallel on the circuit of being made up of the normal opened contact of current-limiting resistance and relay; the positive pole of second voltage stabilizing didoe is connected the negative contacts of the current-limiting resistance and first voltage stabilizing didoe; negative pole is connected the positive pole of storage capacitor; it is in parallel with relay coil to be used for the diode that the relay reverse voltage releases; its negative pole is connected with the relay coil negative pole, and positive pole is connected with the positive pole of relay coil.
Be serially connected with semistor and negative tempperature coefficient thermistor between described ac input end and the rectification circuit.
The present invention compares with traditional implementation, can realize the overvoltage protection to storage capacitor, has the surge of powering on restriction, short circuit overcurrent defencive function again by positive and negative temperature coefficient thermistor simultaneously.
Description of drawings
Below by accompanying drawing technical solution of the present invention is done further detailed description:
Fig. 1 is a circuit diagram of the present invention.
Embodiment
Circuit diagram of the present invention as shown in Figure 1, wherein L, N are ac input end, DC+, DC-are dc power output end, semistor PTC, negative tempperature coefficient thermistor NTC, rectifier circuit D1, relay J D, the diode D2 that is used for relay reverse voltage bleed off, the first voltage stabilizing didoe D3, the second voltage stabilizing didoe D4, current-limiting resistance R1, storage capacitor C1.
Its course of work is as follows:
When power supply electrifying, because the characteristic of negative tempperature coefficient thermistor NTC, it has certain resistance value when low temperature, thereby limited the surge current that powers on, and when operate as normal, because self-heating, resistance value reduces, can not exert an influence, select the negative tempperature coefficient thermistor NTC of suitable resistance as required, can will power on inrush current limitation within the acceptable range system.
When short circuit of direct current output loop or long-term overcurrent, because the characteristic of semistor PTC, when its rated current certain time-delay of current practice, its resistance will increase rapidly, thereby loop current is inhibited, thereby protect the safety of back end loop.
When loop voltage just often, relay is failure to actuate, voltage after the rectification charges to electric capacity through the normally closed contact of relay J D, when electric voltage exception raises, if the voltage after the rectification is through first voltage stabilizing, two collector D3, still surpass the action of relay after the second voltage stabilizing didoe D4 step-down, relay will move, this moment, normally closed contact was opened, thereby charge circuit is cut off, while normal opened contact closure, voltage on the electric capacity will be by second voltage stabilizing, two collector D4, the shunt circuit of current-limiting resistance R1 and first voltage stabilizing, two collector D3, relay coil constitutes the loop, and capacitance voltage will descend gradually, behind the return voltage that arrives relay, relay discharges, and gets back to normal operating state.By selecting suitable first, second voltage stabilizing two collector D3, D4 can adjust the overvoltage operating value; can adjust the relay return value by selecting suitable current-limiting resistance R1 value; owing to exist certain pressure reduction between operating value and return value; even if also can frequent movement under the situation of often overvoltage, thereby protection relay.
Because the leakage current of first, second voltage stabilizing two collector D3, D4 is the microampere rank during operate as normal, therefore be that the electric weight on the electric capacity also can keep a few hours to go into after convenient charge power supply disappeared.
Claims (2)
1. storage capacitor protective circuit; comprise rectification circuit that is connected ac input end and the storage capacitor that is connected dc output end; it is characterized in that: a storage capacitor overvoltage crowbar in parallel between rectification circuit and storage capacitor; described storage capacitor overvoltage crowbar is by the relay with normal opened contact and normally closed contact; first voltage stabilizing didoe; second voltage stabilizing didoe and current-limiting resistance are formed; the normally closed contact of described relay is connected between the positive pole of the output of rectification circuit and storage capacitor; the normal opened contact of described relay is connected on the circuit of being made up of the current-limiting resistance and second voltage stabilizing didoe; first voltage stabilizing didoe is connected in parallel on the circuit of being made up of the normal opened contact of current-limiting resistance and relay; the positive pole of second voltage stabilizing didoe is connected the negative contacts of the current-limiting resistance and first voltage stabilizing didoe; negative pole is connected the positive pole of storage capacitor; it is in parallel with relay coil to be used for the diode that the relay reverse voltage releases; its negative pole is connected with the relay coil negative pole, and positive pole is connected with the positive pole of relay coil.
2. storage capacitor protective circuit according to claim 1 is characterized in that: connect between described ac input end and the rectification circuit semistor and negative tempperature coefficient thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105789928A CN102097788A (en) | 2010-12-08 | 2010-12-08 | Protection circuit of storage capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105789928A CN102097788A (en) | 2010-12-08 | 2010-12-08 | Protection circuit of storage capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102097788A true CN102097788A (en) | 2011-06-15 |
Family
ID=44130708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105789928A Pending CN102097788A (en) | 2010-12-08 | 2010-12-08 | Protection circuit of storage capacitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102097788A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104332944A (en) * | 2014-10-27 | 2015-02-04 | 华南理工大学 | Pressure-sensitive and thermosensitive combined type overvoltage and over-current protecting device |
| CN106159732A (en) * | 2016-07-05 | 2016-11-23 | 湖南长高电气有限公司 | A kind of high-tension distribution box for electric vehicle |
| CN110176756A (en) * | 2015-03-27 | 2019-08-27 | 亚德诺半导体集团 | Electrical overstress record and/or acquisition |
| US11644497B2 (en) | 2015-03-27 | 2023-05-09 | Analog Devices International Unlimited Company | Charge storage with electrical overstress protection |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002087051A1 (en) * | 2001-04-19 | 2002-10-31 | Atkin Design And Development Limited | Electrical power supply |
| US20090002908A1 (en) * | 2007-06-28 | 2009-01-01 | Delta Electronics, Inc. | Circuit and method for protecting energy-storage device |
| CN101814727A (en) * | 2010-05-18 | 2010-08-25 | 福州欣联达电子科技有限公司 | Permanent magnet motor high rotating speed current limiting circuit |
| CN201629560U (en) * | 2008-12-05 | 2010-11-10 | 刘圣平 | High-reliability out-of-control preventive composite temperature control circuit |
| CN201868866U (en) * | 2010-12-08 | 2011-06-15 | 上海申瑞电力科技股份有限公司 | Storage capacitor protective circuit |
-
2010
- 2010-12-08 CN CN2010105789928A patent/CN102097788A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002087051A1 (en) * | 2001-04-19 | 2002-10-31 | Atkin Design And Development Limited | Electrical power supply |
| US20090002908A1 (en) * | 2007-06-28 | 2009-01-01 | Delta Electronics, Inc. | Circuit and method for protecting energy-storage device |
| CN201629560U (en) * | 2008-12-05 | 2010-11-10 | 刘圣平 | High-reliability out-of-control preventive composite temperature control circuit |
| CN101814727A (en) * | 2010-05-18 | 2010-08-25 | 福州欣联达电子科技有限公司 | Permanent magnet motor high rotating speed current limiting circuit |
| CN201868866U (en) * | 2010-12-08 | 2011-06-15 | 上海申瑞电力科技股份有限公司 | Storage capacitor protective circuit |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104332944A (en) * | 2014-10-27 | 2015-02-04 | 华南理工大学 | Pressure-sensitive and thermosensitive combined type overvoltage and over-current protecting device |
| CN104332944B (en) * | 2014-10-27 | 2017-10-20 | 华南理工大学 | A kind of pressure-sensitive temperature-sensitive compound type overvoltage over-current protection device |
| CN110176756A (en) * | 2015-03-27 | 2019-08-27 | 亚德诺半导体集团 | Electrical overstress record and/or acquisition |
| US11644497B2 (en) | 2015-03-27 | 2023-05-09 | Analog Devices International Unlimited Company | Charge storage with electrical overstress protection |
| CN106159732A (en) * | 2016-07-05 | 2016-11-23 | 湖南长高电气有限公司 | A kind of high-tension distribution box for electric vehicle |
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Application publication date: 20110615 |