CN112886686A - Safety protection circuit of direct current charger - Google Patents
Safety protection circuit of direct current charger Download PDFInfo
- Publication number
- CN112886686A CN112886686A CN202110344646.1A CN202110344646A CN112886686A CN 112886686 A CN112886686 A CN 112886686A CN 202110344646 A CN202110344646 A CN 202110344646A CN 112886686 A CN112886686 A CN 112886686A
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- Prior art keywords
- direct current
- current contactor
- emergency stop
- control branch
- stop button
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- 238000001514 detection method Methods 0.000 claims abstract description 13
- 230000001960 triggered effect Effects 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a safety protection circuit of a direct current charger, which comprises: the system comprises an alternating-current power supply, a four-stage circuit breaker, a rectification power module, a first direct-current contactor, a second direct-current contactor, a first charging interface, a second charging interface, a power rectifier, an emergency stop button, a door detection microswitch, an intermediate relay and a shunt release; the alternating current power supply, the four-stage circuit breaker, the rectification power module, the first direct current contactor, the second direct current contactor, the first charging interface and the second charging interface form a main loop, the power rectifier, the door detection microswitch, the emergency stop button and the intermediate relay form a first control branch, the alternating current power supply, the intermediate relay, the emergency stop button and the shunt release form a second control branch, and the power rectifier, the intermediate relay, the first direct current contactor and the second direct current contactor form a third control branch.
Description
Technical Field
The invention relates to the technical field of chargers, in particular to a safety protection circuit of a direct-current charger.
Background
In the prior art, a charger is required to have an emergency stop function and a door opening protection function, and the specific requirements are as follows: when the emergency stop device is started or the charging machine door is opened to cause the charged part to be exposed, the integrated charging machine should cut off the power supply input and the direct current output at the same time, and when the emergency stop device is started, the integrated charging machine should cut off the direct current output within 100 ms.
In contrast, in the related art, as shown in fig. 1, a three-phase four-wire ac power supply is connected to a charger, and is connected to an input terminal of a rectified power module PM in the charger via a breaker QF and an ac contactor KM. When the charger normally works, the breaker QF and the alternating current contactor KM are in a closed state, when an emergency stop device is started or a cabinet door is opened, the emergency stop button SBE or the door detection microswitch SQ is triggered to cause the coil of the alternating current contactor KM to lose power and the contacts to be disconnected, so that the power supply input is disconnected, and then the direct current output contactors K1 and K2 control the power loss and the contacts to be disconnected. According to the method, an alternating current contactor is needed, the alternating current contactor used in the direct current charging pile is large due to high power, the cost is high, once the alternating current contactor fails, the input of a power supply cannot be disconnected, the output of direct current cannot be disconnected, the protection effect cannot be achieved, and the safety is poor.
Disclosure of Invention
The invention provides a novel safety protection circuit of a direct current charger based on at least one of the technical problems, the circuit structure is reasonable in design, the simultaneous cutting-off of the input and the output of a power alternating current power supply is realized under the condition of not using an alternating current contactor, the safety is ensured, and the cost is reduced.
In view of this, the present invention provides a new safety protection circuit for a dc charger, including: the system comprises an alternating-current power supply, a four-stage circuit breaker, a rectification power module, a first direct-current contactor, a second direct-current contactor, a first charging interface, a second charging interface, a power rectifier, an emergency stop button, a door detection microswitch, an intermediate relay and a shunt release; the alternating current power supply, the four-stage circuit breaker, the rectification power module, the first direct current contactor, the second direct current contactor, the first charging interface and the second charging interface form a main loop, the power rectifier, the door detection microswitch, the emergency stop button and the intermediate relay form a first control branch, the alternating current power supply, the intermediate relay, the emergency stop button and the shunt release form a second control branch, and the power rectifier, the intermediate relay, the first direct current contactor and the second direct current contactor form a third control branch; when a door detection microswitch in the first control branch circuit and a first normally open contact of an emergency stop button are triggered, the second control branch circuit controls a circuit breaker in the main circuit to be disconnected so as to cut off alternating current input of the main circuit, and the third control branch circuit controls a normally open contact of a first direct current contactor and a normally open contact of a second direct current contactor in the main circuit to be disconnected so as to cut off direct current output of the main circuit.
In the above technical solution, preferably, when the second normally open contact of the emergency stop button in the second control branch is triggered, the shunt release operates to control the circuit breaker in the main circuit to open, so as to cut off the ac input of the main circuit.
Through the technical scheme, the whole circuit structure is reasonable in design, under the condition that the alternating current contactor is not used, the safety requirement of relevant standards on the charger is still met, the cost is saved, and in addition, even if the intermediate relay KA or the power rectifier fails, the shunt release can still be triggered by pressing the emergency stop button to disconnect the circuit breaker, so that the alternating current power supply input is disconnected, the safety accident is avoided, and the safety of the charger is further improved.
Drawings
Fig. 1 is a schematic diagram showing a configuration of a safety protection circuit in the related art;
fig. 2 shows a schematic structural diagram of a safety protection circuit of a direct current charger according to an embodiment of the invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
As shown in fig. 2, the safety protection circuit of the dc charger includes: the intelligent control system comprises an alternating current power supply AC, a four-stage circuit breaker QF, a rectification power module PM, a first direct current contactor K1, a second direct current contactor K2, a first charging interface DC +, a second charging interface DC-, a power rectifier VC, an emergency stop button SBE, a door detection microswitch SQ, an intermediate relay KA and a shunt release MX.
The alternating current power supply AC, the four-stage circuit breaker QF, the rectification power module PM, the first direct current contactor K1, the second direct current contactor K2, the first charging interface DC +, the second charging interface DC-form a main loop, the power rectifier VC, the door detection microswitch SQ, the emergency stop button SBE and the intermediate relay KA form a first control branch, the alternating current power supply AC, the intermediate relay KA, the emergency stop button SBE and the shunt release MX form a second control branch, and the power rectifier VC, the intermediate relay KA, the first direct current contactor K1 and the second direct current contactor K2 form a third control branch.
Specifically, a first control branch is powered by a power supply collator VC to form a 12V power supply, and a normally open contact of a door detection microswitch SQ is connected in parallel with a first normally open contact of an emergency stop button SBE and then connected in series with a coil of an intermediate relay KA. When a cabinet door of the charger is opened (namely the door detection microswitch SQ is triggered) or the emergency stop button is pressed, the intermediate relay KA acts; the second control branch is powered by an alternating current power supply AC to 220V, a normally open contact of the intermediate relay KA is connected with a second normally open contact of the emergency stop button SBE in parallel and then connected with a coil of the shunt release MX in series, and when the intermediate relay KA acts and the normally open contact is closed or the emergency stop button is pressed, the shunt release acts to disconnect the breaker QF; the third control branch is supplied with 12V power by a power rectifier VC, a normally closed contact of an intermediate relay KA is connected with coils of the direct current contactors K1 and K2 in series, and when the intermediate relay KA acts and the normally closed contact is disconnected, the direct current contactors K1 and K2 reset and the normally open contact is disconnected.
The whole circuit does not use an alternating current contactor, so that the cost is saved, the safety requirement of relevant standards on a charger is still met, and even if the intermediate relay KA or the power rectifier VC fails, the shunt release can be triggered by pressing the emergency stop button to disconnect the circuit breaker, so that the input of an alternating current power supply is disconnected, and the safety accident is avoided.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A direct current charger safety protection circuit which is characterized by comprising:
the system comprises an alternating-current power supply, a four-stage circuit breaker, a rectification power module, a first direct-current contactor, a second direct-current contactor, a first charging interface, a second charging interface, a power rectifier, an emergency stop button, a door detection microswitch, an intermediate relay and a shunt release;
the alternating current power supply, the four-stage circuit breaker, the rectification power module, the first direct current contactor, the second direct current contactor, the first charging interface and the second charging interface form a main loop, the power rectifier, the door detection microswitch, the emergency stop button and the intermediate relay form a first control branch, the alternating current power supply, the intermediate relay, the emergency stop button and the shunt release form a second control branch, and the power rectifier, the intermediate relay, the first direct current contactor and the second direct current contactor form a third control branch;
when a door detection microswitch in the first control branch circuit and a first normally open contact of an emergency stop button are triggered, the second control branch circuit controls a circuit breaker in the main circuit to be disconnected so as to cut off alternating current input of the main circuit, and the third control branch circuit controls a normally open contact of a first direct current contactor and a normally open contact of a second direct current contactor in the main circuit to be disconnected so as to cut off direct current output of the main circuit.
2. The safety protection circuit of the direct current charger according to claim 1, wherein when the second normally open contact of the emergency stop button in the second control branch is triggered, the shunt release acts to control the circuit breaker in the main loop to open so as to cut off the alternating current input of the main loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110344646.1A CN112886686A (en) | 2021-03-31 | 2021-03-31 | Safety protection circuit of direct current charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110344646.1A CN112886686A (en) | 2021-03-31 | 2021-03-31 | Safety protection circuit of direct current charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112886686A true CN112886686A (en) | 2021-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110344646.1A Pending CN112886686A (en) | 2021-03-31 | 2021-03-31 | Safety protection circuit of direct current charger |
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| CN (1) | CN112886686A (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0068523A1 (en) * | 1981-06-17 | 1983-01-05 | Gebrüder Zehnder AG | Circuit arrangement for charging a battery with direct current pulses |
| CN202817688U (en) * | 2012-08-01 | 2013-03-20 | 华立仪表集团股份有限公司 | Power supply protection circuit of electric automobile charging pile and electric automobile charging pile |
| CN204118813U (en) * | 2014-10-10 | 2015-01-21 | 安徽普为智能科技有限责任公司 | Direct-current charging post main circuit dual control electric power system |
| CN106100082A (en) * | 2016-07-07 | 2016-11-09 | 湖北盛弘电力技术开发有限公司 | A kind of electric automobile Split type intelligent DC charging all-in-one |
| CN205846801U (en) * | 2016-07-28 | 2016-12-28 | 青岛华烁高科新能源技术有限公司 | Electric automobile integral type DC charging motor |
| CN207010323U (en) * | 2017-08-01 | 2018-02-13 | 广东尚晟新能源科技有限公司 | A kind of charging pile system with double charging guns |
| CN207166202U (en) * | 2017-08-01 | 2018-03-30 | 广东尚晟新能源科技有限公司 | A kind of charging pile system |
| CN207274434U (en) * | 2017-07-27 | 2018-04-27 | 安徽雄峰新能源科技有限公司 | A kind of single flow charging system |
| CN207410253U (en) * | 2017-10-31 | 2018-05-25 | 安瑞科(蚌埠)压缩机有限公司 | Compress electrical-mechanical system interlocking emergency stop device |
| CN108879902A (en) * | 2018-07-19 | 2018-11-23 | 深圳市车电网络有限公司 | AC/DC integrated formula non-on-board charger and charge control method |
| CN109347182A (en) * | 2018-12-18 | 2019-02-15 | 辽宁恒顺新能源科技有限公司 | Charging pile control unit |
| CN210161933U (en) * | 2019-06-24 | 2020-03-20 | 江苏智绿充电科技有限公司 | Direct current-to-direct current integrated charger |
-
2021
- 2021-03-31 CN CN202110344646.1A patent/CN112886686A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0068523A1 (en) * | 1981-06-17 | 1983-01-05 | Gebrüder Zehnder AG | Circuit arrangement for charging a battery with direct current pulses |
| CN202817688U (en) * | 2012-08-01 | 2013-03-20 | 华立仪表集团股份有限公司 | Power supply protection circuit of electric automobile charging pile and electric automobile charging pile |
| CN204118813U (en) * | 2014-10-10 | 2015-01-21 | 安徽普为智能科技有限责任公司 | Direct-current charging post main circuit dual control electric power system |
| CN106100082A (en) * | 2016-07-07 | 2016-11-09 | 湖北盛弘电力技术开发有限公司 | A kind of electric automobile Split type intelligent DC charging all-in-one |
| CN205846801U (en) * | 2016-07-28 | 2016-12-28 | 青岛华烁高科新能源技术有限公司 | Electric automobile integral type DC charging motor |
| CN207274434U (en) * | 2017-07-27 | 2018-04-27 | 安徽雄峰新能源科技有限公司 | A kind of single flow charging system |
| CN207010323U (en) * | 2017-08-01 | 2018-02-13 | 广东尚晟新能源科技有限公司 | A kind of charging pile system with double charging guns |
| CN207166202U (en) * | 2017-08-01 | 2018-03-30 | 广东尚晟新能源科技有限公司 | A kind of charging pile system |
| CN207410253U (en) * | 2017-10-31 | 2018-05-25 | 安瑞科(蚌埠)压缩机有限公司 | Compress electrical-mechanical system interlocking emergency stop device |
| CN108879902A (en) * | 2018-07-19 | 2018-11-23 | 深圳市车电网络有限公司 | AC/DC integrated formula non-on-board charger and charge control method |
| CN109347182A (en) * | 2018-12-18 | 2019-02-15 | 辽宁恒顺新能源科技有限公司 | Charging pile control unit |
| CN210161933U (en) * | 2019-06-24 | 2020-03-20 | 江苏智绿充电科技有限公司 | Direct current-to-direct current integrated charger |
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| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210601 |