CN105098701A - Short-circuit protection circuit and method of vehicular charger - Google Patents
Short-circuit protection circuit and method of vehicular charger Download PDFInfo
- Publication number
- CN105098701A CN105098701A CN201510645386.6A CN201510645386A CN105098701A CN 105098701 A CN105098701 A CN 105098701A CN 201510645386 A CN201510645386 A CN 201510645386A CN 105098701 A CN105098701 A CN 105098701A
- Authority
- CN
- China
- Prior art keywords
- circuit
- short
- comparison
- voltage
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
A short-circuit protection circuit of a vehicular charger comprises amplification circuits, comparison circuits, a logical judgment circuit and a central processing unit, wherein the current and the voltage of a high-voltage output end are input into the respective amplification circuits, the amplification circuits are connected with the comparison circuits respectively, the comparison circuits are connected with the logical judgment circuit, and the logical judgment circuit performs judgments. A short-circuit protection method comprises steps as follows: the current and the voltage of the high-voltage output end are detected, detected signals are amplified through the amplification circuits, compared with reference values of the comparison circuits and judged through the logical judgment circuit, and if a short-circuit condition occurs actually, a chopper circuit drive tube and a relay on an output loop are shut off, so that a circuit of the vehicular charger is protected. The protection circuit is independent of overcurrent protection and can act quickly when short-circuit conditions occur, protect devices inside the charger, shut off output of the charger and guarantee personal safety.
Description
Technical field
The invention belongs to car electrics technology, be specifically related to the circuit design of Vehicular charger.
Background technology
Along with people are to the raising of car comfort, security requirement, new-energy automobile is developed rapidly.The potential hazard how eliminating the vehicle-mounted end high pressure of electric automobile is the key of pure electric automobile safety, and the protection of relevant national standard to piece safety proposes and explicitly call for.For this reason, how to realize guard block and carry out the problem that safeguard protection becomes industry research in abnormal cases.
Vehicular charger is the interface that pure electric automobile obtains the energy.Owing to working in a high voltage state, consider for the angle of personal safety and cell safety, be absolutely necessary to the safeguard protection of charger, wherein short-circuit protection is very important.The many protections by realizing Vehicular charger enforcement overcurrent protection charger short-circuit condition of current charger.Due in charging process, Vehicular charger has significant period of time to be operated in constant current mode, and when now having short circuit to occur, it is have time delay that output current reports controller to carry out overcurrent protection after increasing.Vehicular charger has the short-circuit protection independent of overcurrent protection to be necessary.
Summary of the invention
The invention provides a kind of Vehicular charger short-circuit protection circuit and method, it is independent of overcurrent protection, can quick acting when short circuit occurs, the safety of protection charger internal components, and charge closing machine exports, protection personal safety.
Technical scheme of the present invention is as follows:
A short-circuit protection circuit for Vehicular charger, comprises amplifying circuit, comparison circuit, logic judging circuit and CPU.The electric current of high-voltage output end and voltage input respective amplifying circuit respectively; by amplifying circuit, the signal detected is amplified; amplifying circuit connects comparison circuit respectively; compare with the fiducial value of comparison circuit; comparison circuit connect logic judging circuit, logic judging circuit judges, if be truly short-circuited situation time; the switching tube disconnecting charger internal main circuit loop drives and output loop repeat circuit, thus reaches the object to Vehicular charger circuit protection.
The setting to two comparator reference voltages should be noted in this programme.Export under-voltage protection and output overcurrent protect because Vehicular charger is generally provided with, the fiducial value of comparator rationally should be set, avoid protection value overlapping ranges.
The present invention, by judging the two-way of voltage signal and current signal, reduces the possibility causing charger erroneous judgement because of interference.By drive circuit and the output relay of the direct charge closing machine of hardware circuit, action is faster, higher to the degree of protection of charger.Simultaneously central processing unit gathers this signal and judges, can by fault information reporting, and user can know fault message more easily, can keep in repair more targetedly, easy to use.
Accompanying drawing explanation
Accompanying drawing 1 is Vehicular charger short-circuit protection circuit block diagram
Accompanying drawing 2 is Vehicular charger short-circuit protection workflow diagrams.
Embodiment
Implementation of the present invention is further illustrated below in conjunction with accompanying drawing:
See Fig. 1, this Vehicular charger short-circuit protection circuit relates to amplifying circuit, comparison circuit, logic judging circuit, CPU.Physical circuit, primarily of device compositions such as divider resistance, operational amplifier, filter capacitor, comparator, NAND gate, central processing units.The electric current of high-voltage output end and voltage input respective amplifying circuit respectively, and amplifying circuit connects comparison circuit respectively, and comparison circuit connects logic judging circuit, and logic judging circuit judges.Short-circuit protection is: detect the electric current of high-voltage output end and voltage; by amplifying circuit, the signal detected is amplified; compare with the fiducial value of comparison circuit; judged by logical circuit; if during the situation that is truly short-circuited; turn off the relay on chopper circuit driving tube and output loop, thus reach the object to Vehicular charger circuit protection.
Also connect CPU at the output of comparison circuit, CPU gathers the comparison value that comparison circuit exports, and judges, by fault information reporting to signal.
See Fig. 2, the implementation step of specifically carrying out short-circuit protection is as follows:
Step1: measure the voltage that Vehicular charger output specifies resistance two ends.
U
i=I
ir
i; (to specify resistance both end voltage size, learning this branch road output current size)
U
O＝R
2U/(R
1+R
2)
Step2: two-way voltage is amplified through operational amplifier.
U'
i＝K
iU
i
U'
o＝K
oU
o
Step3: the signal after amplifying is compared with reference voltage separately, then comparison value is exported.If result is true, then export 1, otherwise export 0.CPU gathers this signal simultaneously.
Step4: two-way comparison output signal is calculated by NAND gate, and signal is exported.
Step5: if when Output rusults is 1, namely represents big current and low-voltage occurs simultaneously, and the switching tube disconnecting charger internal main circuit loop drives and output loop repeat circuit.CPU reports and fault is reported entire car controller.
Claims (3)
1. a short-circuit protection circuit for Vehicular charger, comprises amplifying circuit, comparison circuit, logic judging circuit and CPU; It is characterized in that, the electric current of high-voltage output end and voltage input respective amplifying circuit respectively, by amplifying circuit, the signal detected is amplified, amplifying circuit connects comparison circuit respectively, the fiducial value of amplifying signal and comparison circuit compared, comparison circuit connects logic judging circuit, judges the comparison value exported, if during the situation that is truly short-circuited, the switching tube disconnecting charger internal main circuit loop drives and output loop repeat circuit.
2. the short-circuit protection circuit of Vehicular charger according to claim 1; it is characterized in that, also connect CPU at the output of comparison circuit, CPU gathers the comparison value that comparison circuit exports; signal is judged, by fault information reporting.
3. a short-circuit protection method for Vehicular charger, comprises the following steps:
Step1: measure the voltage that Vehicular charger output specifies resistance two ends;
U
i＝I
iR
i；
U
O＝R
2U/(R
1+R
2)
Step2: two-way voltage is amplified through operational amplifier
U'
i＝K
iU
i
U'
o＝K
oU
o
Step3: compared with reference voltage separately by the signal after amplifying, then exported by comparison value, if result is true, then export 1, otherwise export 0, central processing unit gathers this signal simultaneously;
Step4: two-way comparison output signal enters logic judging circuit, is calculated by NAND gate, and is exported by signal;
Step5: if when Output rusults is 1, namely represents big current and low-voltage occurs simultaneously, and the switching tube disconnecting charger internal main circuit loop drives and output loop repeat circuit, and CPU reports and fault is reported entire car controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510645386.6A CN105098701A (en) | 2015-09-30 | 2015-09-30 | Short-circuit protection circuit and method of vehicular charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510645386.6A CN105098701A (en) | 2015-09-30 | 2015-09-30 | Short-circuit protection circuit and method of vehicular charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105098701A true CN105098701A (en) | 2015-11-25 |
Family
ID=54578581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510645386.6A Pending CN105098701A (en) | 2015-09-30 | 2015-09-30 | Short-circuit protection circuit and method of vehicular charger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105098701A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106353633A (en) * | 2016-08-31 | 2017-01-25 | 云南巨电科技有限公司 | Method for judging short-circuit fault and charging process of direct-current charging pile |
| CN106483421A (en) * | 2016-11-29 | 2017-03-08 | 深圳市燕麦科技股份有限公司 | Open-short circuit system and method for testing between one kind is point-to-point |
| CN109347072A (en) * | 2018-10-12 | 2019-02-15 | 江苏佳源科技有限公司 | Intelligent low-pressure breaker of plastic casing |
| CN109346386A (en) * | 2018-10-12 | 2019-02-15 | 江苏佳源科技有限公司 | Intelligent low-pressure breaker of plastic casing |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0998172A2 (en) * | 1998-10-22 | 2000-05-03 | Hella KG Hueck & Co. | Process and device for short-circuit detection in a high-pressure discharge lamp ballast in a vehicle |
| CN101702506A (en) * | 2009-10-30 | 2010-05-05 | 中国船舶重工集团公司第七一九研究所 | Method and device for rapidly detecting short-circuit fault of power system |
| CN203472566U (en) * | 2013-09-07 | 2014-03-12 | 潍柴动力股份有限公司 | Electric vehicle high-voltage electric overload short circuit protecting system |
-
2015
- 2015-09-30 CN CN201510645386.6A patent/CN105098701A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0998172A2 (en) * | 1998-10-22 | 2000-05-03 | Hella KG Hueck & Co. | Process and device for short-circuit detection in a high-pressure discharge lamp ballast in a vehicle |
| CN101702506A (en) * | 2009-10-30 | 2010-05-05 | 中国船舶重工集团公司第七一九研究所 | Method and device for rapidly detecting short-circuit fault of power system |
| CN203472566U (en) * | 2013-09-07 | 2014-03-12 | 潍柴动力股份有限公司 | Electric vehicle high-voltage electric overload short circuit protecting system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106353633A (en) * | 2016-08-31 | 2017-01-25 | 云南巨电科技有限公司 | Method for judging short-circuit fault and charging process of direct-current charging pile |
| CN106353633B (en) * | 2016-08-31 | 2019-03-01 | 云南巨电科技有限公司 | A kind of method of discrimination of direct-current charging post short trouble and charging process |
| CN106483421A (en) * | 2016-11-29 | 2017-03-08 | 深圳市燕麦科技股份有限公司 | Open-short circuit system and method for testing between one kind is point-to-point |
| CN109347072A (en) * | 2018-10-12 | 2019-02-15 | 江苏佳源科技有限公司 | Intelligent low-pressure breaker of plastic casing |
| CN109346386A (en) * | 2018-10-12 | 2019-02-15 | 江苏佳源科技有限公司 | Intelligent low-pressure breaker of plastic casing |
| CN109346386B (en) * | 2018-10-12 | 2019-10-18 | 宁波智轩物联网科技有限公司 | Intelligent low-pressure breaker of plastic casing |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203445596U (en) | Charging interface protection circuit and charger | |
| CN105098701A (en) | Short-circuit protection circuit and method of vehicular charger | |
| CN104319740A (en) | Monitoring and protecting device for electric field coupling wireless charging system and method thereof | |
| CN106230057A (en) | The precharge of a kind of converter and error protection integrated apparatus | |
| CN105680417B (en) | A kind of active short-circuit control circuit and control method | |
| CN104142433A (en) | Active type direct-current system insulation resistor detection method | |
| CN104935026A (en) | Battery cell device with battery cell and limiting circuit and corresponding method | |
| CN103746347A (en) | Battery protection chip and battery system | |
| CN105305660A (en) | Noncontact charging open circuit protection device | |
| CN104730441A (en) | Thyristor fault detecting device | |
| CN105034841A (en) | Strong electricity charging and discharging control method of hybrid electric vehicle and apparatus thereof | |
| CN207875401U (en) | High-voltage interlocking detecting system | |
| CN104852358A (en) | High-voltage battery over-voltage and under-voltage protection system and automobile provided with same | |
| CN111319465B (en) | Abnormal protection device for running electric vehicle | |
| CN103199505A (en) | Output short-circuit protection circuit for high tension battery | |
| JP2015139349A (en) | connection system | |
| CN103746412A (en) | Electrical vehicle charging and discharging interlock circuit | |
| CN106026229A (en) | Shunting device and working method thereof | |
| CN104924910A (en) | High-voltage distribution board circuit | |
| CN204597511U (en) | A kind of novel battery pre-charge circuit | |
| CN108521118A (en) | The protection control circuit of automobile power drive system | |
| KR20150076843A (en) | Protection circuit for battery of electric vehicle and driving method thereof | |
| CN105914730A (en) | Vehicle-mounted-charger reverse connection prevention method | |
| CN109617021B (en) | Grounding detection protection method for traction converter of railway vehicle | |
| CN203193261U (en) | Protection circuit for output short circuit of high-voltage battery pack |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20151125 |
|
| RJ01 | Rejection of invention patent application after publication |