CN202602326U - Charger with over-voltage protection - Google Patents
Charger with over-voltage protection Download PDFInfo
- Publication number
- CN202602326U CN202602326U CN 201220205298 CN201220205298U CN202602326U CN 202602326 U CN202602326 U CN 202602326U CN 201220205298 CN201220205298 CN 201220205298 CN 201220205298 U CN201220205298 U CN 201220205298U CN 202602326 U CN202602326 U CN 202602326U
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- charger
- circuit
- relay
- battery pack
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Abstract
The utility model relates to a charger with over-voltage protection, solving the problems that the common charger is not provided with over-voltage protection and is easy to damage the battery; and the common over-voltage protection device can not be reused for many times. The structure of the charger with over-voltage protection comprises a charger, a sampling circuit, a comparator circuit and a relay circuit, wherein a loop is formed between the charger and a battery pack; the input end of the sampling circuit is connected with the circuit between the charger and the battery pack; the output end of the sampling circuit is connected with the input end of the comparator circuit; the output end of the comparator circuit is connected with the control end of the relay circuit; and the relay circuit is connected with the circuit between the charger and the battery pack. The charger with over-voltage protection has the advantages that the charging circuit meets overvoltage, the charging loop can be disconnected permanently, thus effectively protecting the batter pack; and the over-voltage protection circuit is a restorability circuit so that the over-voltage protection circuit can be restored only by pulling out the plug of the charger from the charging socket of the battery pack, thus being able to be reused.
Description
Technical field
The utility model relates to a kind of over-voltage protection technology, relates in particular to a kind of simple in structure, charger with overvoltage protection of improving dependability.
Background technology
The energy of electric motor car supporting battery be in the electric accessory motor the most expensive most important its performance of accessory the quality and correct using and discharge and recharge seem particularly important.The thermal runaway (promptly overcharging) that causes battery is except that the quality of battery own the bad and serious dehydration of battery; Charger also be cause the battery thermal runaway importance especially when charger generation voltage is out of control (this moment, output voltage can reach about hectovolt) this time will have two kinds of situation to take place: 1. (the charger output is not connected with battery) causes charger itself to get killed certainly owing to output voltage substantially exceeds withstand voltage its puncture short that makes of charger output capacitance when the output of charger is unloaded.Can't continue to use thereby battery is not constituted infringement.2. when the output of charger is connected charging with battery, because charging current plays the effect of a clamp than macrocell itself, higher charger output voltage is lived by the cell voltage clamp and is caused the illusion that can charge normal.But along with reducing of charging current, the clamping action of battery is also more and more littler, and the output voltage of charger can surpass the ceiling voltage that battery allowed all the time.Make battery normally transition in charging process, regularly defencive function is of no avail too even charger possesses.Cause to seriously the overcharging of battery, until the inflation battery.Need design the protective circuit of this simple possible for the generation of avoiding above-mentioned fault.
Like the patent No. is 200620015558.8; Name is called the over-pressure safety device that is used for battery charger; This device comprises fuse and over-voltage detection circuit; Fuse is serially connected on the control circuit of the charge switch management and control system utmost point in the charge circuit, and the charge switch pipe is operated in permanent off state when making it work as blowout.This device is when overvoltage, and charge circuit is by permanent disconnection, and charge switch is controlled by charging control circuit no longer, continues charging when having avoided the battery overvoltage and damages battery, has effectively protected battery.But this device need fuse to fuse in order to reach the permanent disconnection of charge circuit, and this is the operation of irrecoverable property, makes charger not reuse, and need change fuse when reusing, and has caused and has used inconvenience.
Summary of the invention
The utility model has mainly solved common charger and has not possessed overvoltage protection; Cause the problem that battery is damaged; And general over-pressure safety device can not nonexpondable problem; Provide a kind of simple in structure, can permanent disconnection charge circuit and the nonexpondable charger of ability with overvoltage protection.
The utility model solves the technical scheme that its technical problem adopted: a kind of charger with overvoltage protection; Comprise charger; Constitute the loop between charger and the battery pack; Also include sample circuit to charger charging voltage sampling, judge charger whether overvoltage comparison circuit and control the relay circuit of charging circuit break-make according to the comparison circuit result, said sample circuit input is connected on the circuit between charger and the battery pack, sample circuit output connection comparison circuit input; The comparison circuit output links to each other with the relay circuit control end, and relay circuit is connected on the circuit between charger and the battery pack.The utility model is taken a sample to the charger charging voltage through sample circuit, by comparison circuit sampling voltage is compared processing then, if charging voltage is out of control, then cuts off charging circuit through relay circuit.Because charger voltage is out of control battery caused the problem of damage like this with regard to having avoided, reached the purpose of protection battery pack, improved the reliability that charger uses.
As a kind of preferred version; Said sample circuit is made up of resistance R 1, resistance R 2 and variable resistor RH; Said resistance R 1 one ends are connected on the circuit between charger positive pole and the battery anode, and tie point is designated as the A point, and resistance R 1 other end is connected with variable resistor RH one end; The variable resistor RH other end is connected with resistance R 2 one ends, resistance R 2 other end ground connection.This sample circuit is a voltage divider that is connected on the charger output, and wherein variable resistor RH can adjust the voltage ratio of divider resistance, makes this overvoltage crowbar can adapt to the charger that different electric is pressed model.
As a kind of preferred version; Said comparison circuit comprises operational amplifier; The electrode input end of operational amplifier is connected on the line between resistance R 1 and the variable resistor RH; The negative input of operational amplifier connects the accurate a reference source of voltage, and the output of operational amplifier connects the control end of relay circuit.Use operational amplifier and form comparison circuit, when operate as normal, operational amplifier electrode input end voltage is lower than the negative input reference voltage, the operational amplifier output terminal output low level.When charging voltage surpasses setting, promptly operational amplifier electrode input end voltage is higher than the negative input reference voltage, operational amplifier output terminal output high level.Operational amplifier output terminal is according to charging voltage situation output high level or the work of low level control relay circuit.
As a kind of preferred version, said accurate a reference source is to take from the 2.5V voltage-reference of charger.This a reference source is used for comparing with the voltage of sample circuit, if sampling voltage is less than reference voltage, then voltage be normal, as if sampling voltage greater than reference voltage, then charging circuit overvoltage.
As a kind of preferred version, relay circuit comprises relay and triode T, relay pack vinculum circle part J, normally-closed contact J1 and normally opened contact J2; Coiler part J one end is connected on the circuit between charger positive pole and the battery anode; Tie point is designated as the B point, and the coiler part J other end is connected on the collector electrode of triode T, and said normally-closed contact J1 is connected on the circuit between A point and the B point; Normally opened contact J2 one end is connected on the triode T collector electrode; The normally opened contact J2 other end is connected on the circuit between charger negative pole and the battery pack negative pole, the output of the base stage concatenation operation amplifier of triode T, the grounded emitter of triode T.Here triode plays an on-off action; The circuit on-off of the break-make control relay coiler part J of triode, under normal circumstances, relay coil part J service interruption; Relay is not worked, and normally-closed contact J1 is connected the charger positive pole with battery anode.When charger voltage is out of control, relay work, normally-closed contact J1 breaks off; Broken off the loop between charger and the battery pack; Normally opened contact J2 is closed simultaneously, makes relay coil part J-shaped become another road path, makes like this no matter charger any situation occurs and all the loop between charger and the battery pack forever broken off; Till the plug of charger is pulled up from the charging socket of battery pack, reached the purpose of protection battery pack.
As a kind of preferred version, the coiler part J of said relay goes up reverse parallel connection has diode D.This diode pair relay coil part J plays the overvoltage protection effect.
As a kind of preferred version, be connected with resistance R 3 between said operational amplifier output terminal and the triode T base stage.Resistance R 3 plays the dividing potential drop effect.
The utility model has the advantages that: 1. can permanent disconnection charge circuit during the charging circuit overvoltage, effectively protected battery pack; 2. overvoltage crowbar is the restorability circuit, pulls up and can recover from the charging socket of battery pack at the plug of charger, can reuse.
Description of drawings
Fig. 1 is a kind of frame view of the utility model;
Fig. 2 is a kind of electrical block diagram of the utility model.
The accurate a reference source 7-of 1-charger 2-battery pack 3-sample circuit 4-comparison circuit 5-relay circuit 6-voltage operational amplifier.
Embodiment
Below through embodiment, and combine accompanying drawing, the technical scheme of the utility model is further described.
Embodiment:
A kind of charger of present embodiment with overvoltage protection; As shown in Figure 1; Comprise charger 1, charger is inserted on the battery pack and constitutes the loop with battery pack, and overvoltage protection comprises sample circuit 3, comparison circuit 4 and relay circuit 5; The sample circuit input is connected on the circuit between charger 1 and the battery pack 2; The sample circuit output connects the comparison circuit input, and comparison circuit 4 outputs link to each other with relay circuit 5 control ends, and relay circuit is connected on the circuit between charger and the battery pack.
Concrete circuit is as shown in Figure 2, and this charger has the accurate a reference source 6 of voltage, and the accurate a reference source of this voltage is 2.5V power supply a reference source, the anodal battery anode that connects of charger, and the battery pack negative pole connects the charger negative pole.Sample circuit 3 comprises resistance R 1, resistance R N, resistance R 2; R1, variable resistor RN and resistance R 2 are connected successively; Wherein the other end of resistance R 1 is connected on the circuit between charger positive pole and the battery anode, and this tie point is designated as A, the other end ground connection of resistance R 2.Comparison circuit 4 comprises operational amplifier 7; This operational amplifier electrode input end is connected between resistance R 1 and the variable resistor RN on the line; The negative input of operational amplifier links to each other with 2.5V power supply a reference source, and the output of operational amplifier connects relay circuit 5 control ends through resistance R 3.Relay circuit comprises relay and triode T and diode D, and this relay comprises coiler part J, normally-closed contact J1 and normally opened contact J2 again.Coiler part J one end is connected on the circuit between charger 1 positive pole and battery pack 2 positive poles; This tie point is designated as the B point; The coiler part J other end is connected on the collector electrode of triode T, and normally-closed contact J1 is connected on the circuit between A point and the B point, and normally opened contact J2 one end is connected on the triode T collector electrode; The normally opened contact J2 other end is connected on the circuit between charger 1 negative pole and battery pack 2 negative poles; The base stage of triode T is the control end of relay circuit, connects resistance R 3, the grounded emitter of triode T.
During this charger work; When charger 1 output voltage just often; The voltage that sample circuit 3 adds to operational amplifier 7 electrode input ends must be lower than the reference voltage of operational amplifier negative input; So operational amplifier 7 outputs can only output low level, at this moment triode T can conducting, and relay is failure to actuate.When the output end voltage of charger 1 surpasses setting, the voltage that is promptly obtained by sample circuit 3 is delivered to the electrode input end of operational amplifier 7, because the output voltage of charger is when uprising because of all faults; At this moment input voltage will surpass the reference voltage of operational amplifier negative input; The output of operational amplifier will be exported high level, thereby works normally opened contact J2 adhesive when making triode T turn-on relay switch; Normally-closed contact J1 breaks off; Make charging circuit break off like this, and the closure of normally opened contact J2 make relay coil part J-shaped become the loop, so just makes no matter charger any situation occurs and all the loop between charger and the battery pack forever broken off; Till the plug of charger is pulled up from the charging socket of battery pack, reached the purpose of protection battery pack.
Specific embodiment described herein only is that the present invention's spirit is illustrated.Person of ordinary skill in the field of the present invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although this paper has used terms such as charger, battery pack, sample circuit, comparison circuit, relay circuit morely, do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain essence of the present invention more easily; It all is contrary with spirit of the present invention being construed to any additional restriction to them.
Claims (7)
1. charger with overvoltage protection; Comprise charger; Constitute the loop between charger and the battery pack; It is characterized in that: also include sample circuit (3) to charger charging voltage sampling, judge charger whether overvoltage comparison circuit (4) and control the relay circuit (5) of charging circuit break-make according to the comparison circuit result, said sample circuit input is connected on the circuit between charger (1) and the battery pack (2), sample circuit output connection comparison circuit input; The comparison circuit output links to each other with the relay circuit control end, and relay circuit is connected on the circuit between charger and the battery pack.
2. a kind of charger according to claim 1 with overvoltage protection; It is characterized in that said sample circuit (3) is made up of resistance R 1, resistance R 2 and variable resistor RH; Said resistance R 1 one ends are connected on the circuit between charger (1) positive pole and battery pack (2) positive pole, and tie point is designated as the A point, and resistance R 1 other end is connected with variable resistor RH one end; The variable resistor RH other end is connected with resistance R 2 one ends, resistance R 2 other end ground connection.
3. a kind of charger according to claim 2 with overvoltage protection; It is characterized in that said comparison circuit (4) comprises operational amplifier (7); The electrode input end of operational amplifier is connected on the line between resistance R 1 and the variable resistor RH; The negative input of operational amplifier connects the accurate a reference source (6) of voltage, and the output of operational amplifier connects the control end of relay circuit (5).
4. a kind of charger with overvoltage protection according to claim 3 is characterized in that said accurate a reference source (6) is for taking from the 2.5V voltage-reference of charger.
5. according to a kind of charger of claim 3 or 4 with overvoltage protection; It is characterized in that relay circuit (5) comprises relay and triode T; Relay pack vinculum circle part J, normally-closed contact J1 and normally opened contact J2, coiler part J one end are connected on the circuit between charger (1) positive pole and battery pack (2) positive pole, and tie point is designated as the B point; The coiler part J other end is connected on the collector electrode of triode T; Said normally-closed contact J1 is connected on the circuit between A point and the B point, and normally opened contact J2 one end is connected on the triode T collector electrode, and the normally opened contact J2 other end is connected on the circuit between charger (1) negative pole and battery pack (2) negative pole; The output of the base stage concatenation operation amplifier (7) of triode T, the grounded emitter of triode T.
6. a kind of charger with overvoltage protection according to claim 5 is characterized in that the last reverse parallel connection of coiler part J of said relay has diode D.
7. a kind of charger with overvoltage protection according to claim 5 is characterized in that being connected with resistance R 3 between said operational amplifier (7) output and the triode T base stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220205298 CN202602326U (en) | 2012-05-09 | 2012-05-09 | Charger with over-voltage protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220205298 CN202602326U (en) | 2012-05-09 | 2012-05-09 | Charger with over-voltage protection |
Publications (1)
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|---|---|
| CN202602326U true CN202602326U (en) | 2012-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220205298 Expired - Fee Related CN202602326U (en) | 2012-05-09 | 2012-05-09 | Charger with over-voltage protection |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103928963A (en) * | 2014-04-28 | 2014-07-16 | 深圳市大疆创新科技有限公司 | Rechargeable battery, charging method and unmanned plane |
| CN103941135A (en) * | 2013-08-07 | 2014-07-23 | 武汉天马微电子有限公司 | Short circuit detection method and device |
| CN104184130A (en) * | 2013-05-27 | 2014-12-03 | 深圳市海洋王照明工程有限公司 | Battery short-circuit protection circuit |
| CN104518527A (en) * | 2013-09-26 | 2015-04-15 | 深圳市海洋王照明工程有限公司 | Battery charging circuit and battery charger |
| CN104836301A (en) * | 2015-05-25 | 2015-08-12 | 泉州市南安市轴飞电子科技有限公司 | Novel energy car |
| CN104836314A (en) * | 2015-05-25 | 2015-08-12 | 泉州市南安市轴飞电子科技有限公司 | New energy vehicle system with function of charge protection |
| CN104852436A (en) * | 2015-05-25 | 2015-08-19 | 泉州市南安市轴飞电子科技有限公司 | Charging pile for new energy vehicle |
| CN106655145A (en) * | 2016-11-17 | 2017-05-10 | 深圳市科陆电子科技股份有限公司 | Battery bus voltage reverse connection protection circuit |
| CN107276136A (en) * | 2016-04-01 | 2017-10-20 | 联发科技股份有限公司 | charger circuit and power system |
| CN108631418A (en) * | 2018-08-29 | 2018-10-09 | 新誉轨道交通科技有限公司 | Vehicle charger and vehicle charging system |
| CN111654078A (en) * | 2020-06-04 | 2020-09-11 | 闻泰通讯股份有限公司 | Overvoltage protection circuit and overvoltage protector |
| CN113675817A (en) * | 2021-07-02 | 2021-11-19 | 富满微电子集团股份有限公司 | Overvoltage protection circuit, overvoltage protection method and chip |
-
2012
- 2012-05-09 CN CN 201220205298 patent/CN202602326U/en not_active Expired - Fee Related
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104184130A (en) * | 2013-05-27 | 2014-12-03 | 深圳市海洋王照明工程有限公司 | Battery short-circuit protection circuit |
| CN103941135A (en) * | 2013-08-07 | 2014-07-23 | 武汉天马微电子有限公司 | Short circuit detection method and device |
| CN104518527A (en) * | 2013-09-26 | 2015-04-15 | 深圳市海洋王照明工程有限公司 | Battery charging circuit and battery charger |
| CN103928963A (en) * | 2014-04-28 | 2014-07-16 | 深圳市大疆创新科技有限公司 | Rechargeable battery, charging method and unmanned plane |
| CN104836301B (en) * | 2015-05-25 | 2016-12-07 | 泉州市南安市轴飞电子科技有限公司 | A kind of new forms of energy car |
| CN104836314A (en) * | 2015-05-25 | 2015-08-12 | 泉州市南安市轴飞电子科技有限公司 | New energy vehicle system with function of charge protection |
| CN104852436A (en) * | 2015-05-25 | 2015-08-19 | 泉州市南安市轴飞电子科技有限公司 | Charging pile for new energy vehicle |
| CN104836314B (en) * | 2015-05-25 | 2016-08-31 | 泉州市南安市轴飞电子科技有限公司 | A kind of new forms of energy car system with charge protection |
| CN104836301A (en) * | 2015-05-25 | 2015-08-12 | 泉州市南安市轴飞电子科技有限公司 | Novel energy car |
| CN107276136A (en) * | 2016-04-01 | 2017-10-20 | 联发科技股份有限公司 | charger circuit and power system |
| CN107276136B (en) * | 2016-04-01 | 2021-02-26 | 联发科技股份有限公司 | Charger circuit and power system |
| US11038358B2 (en) | 2016-04-01 | 2021-06-15 | Mediatek Inc. | Charger circuit with battery protection mechanism |
| CN106655145A (en) * | 2016-11-17 | 2017-05-10 | 深圳市科陆电子科技股份有限公司 | Battery bus voltage reverse connection protection circuit |
| CN106655145B (en) * | 2016-11-17 | 2018-12-07 | 深圳市科陆电子科技股份有限公司 | A kind of battery power feeds electric voltage reverse-connection protection circuit |
| CN108631418A (en) * | 2018-08-29 | 2018-10-09 | 新誉轨道交通科技有限公司 | Vehicle charger and vehicle charging system |
| CN111654078A (en) * | 2020-06-04 | 2020-09-11 | 闻泰通讯股份有限公司 | Overvoltage protection circuit and overvoltage protector |
| CN113675817A (en) * | 2021-07-02 | 2021-11-19 | 富满微电子集团股份有限公司 | Overvoltage protection circuit, overvoltage protection method and chip |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121212 Termination date: 20160509 |
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| CF01 | Termination of patent right due to non-payment of annual fee |