CN105811376A - Short circuit protection and control system of electronic circuit - Google Patents
Short circuit protection and control system of electronic circuit Download PDFInfo
- Publication number
- CN105811376A CN105811376A CN201410855379.4A CN201410855379A CN105811376A CN 105811376 A CN105811376 A CN 105811376A CN 201410855379 A CN201410855379 A CN 201410855379A CN 105811376 A CN105811376 A CN 105811376A
- Authority
- CN
- China
- Prior art keywords
- circuit
- short
- protection
- battery charger
- voltage
- 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
The invention provides a short circuit protection and control system of an electronic circuit. The system comprises an output voltage detection circuit, a protection voltage threshold setting circuit and a control signal delay circuit. According to the invention, at the moment of output short circuit of a battery charger, voltage instantly falls to 0V; output voltage is detected, and finally a control signal is output to a power supply management chip; the whole battery charger stops working to realize protection; the whole power supply stops working to realize protection; and the safety of the charger is ensured.
Description
Technical field
The present invention relates to battery charger field, particularly relate to battery charger charger.
Background technology
The application of current battery charger is more and more extensive, in the defencive function of battery charger, is typically necessary output short circuit protection, to prevent the battery charger excessive damage battery charger of the operating current when output short-circuit and load.And the quality of output short circuit protection performance directly affects the reliability of whole battery charger.
At present, the short-circuit protection circuit in battery charger mostly adopts the current peak limiting circuit within pulse width modulating chip to detect the operating current of transformer primary side, limits its peak value to reach the function of short-circuit protection.Due to this current peak simply limiting major loop, frequently protecting in the short-circuit state always and recover, the operating current of major loop is still very big, there is battery charger short circuit output residual voltage height, and loss is big, the problem that reliability is low.
The short-circuit protection circuit also having percentage of batteries charger is general detection output electric current, when detecting that output electric current stops battery charger operation time excessive and reaches the function of protection.Owing to this detection mode needs series connection sampling resistor on output loop, along with the increase of battery charger output-current rating, it is desirable to adopt the sampling resistor of greater power and less resistance, this volume also making short-circuit protection circuit and cost to increase.
Summary of the invention
For above-mentioned the problems of the prior art and shortcoming; this novel practical proposes a kind of battery charger short-circuit protection circuit; the operating current of battery charger and loss during to reduce short-circuit protection; improve the reliability of power supply, and volume and cost will not increase because of the increase of battery charger rated current.
The technical scheme of this novel practical is as follows:A kind of battery charger short-circuit protection circuit,Including output voltage detecting circuit, protection voltage threshold, circuit, control signal delay circuit are set wherein:
Protection voltage threshold arranges circuit for arranging short-circuit protection threshold voltage, and this voltage is generally the 5% ~ 30% of output voltage；
Output voltage detecting circuit, for detecting whether output voltage has the phenomenon lower than short-circuit protection threshold voltage；
Control signal delay circuit, when output voltage detecting circuit detects that short circuit is as now, described control signal delay circuit can produce delay time, if power supply output departs from short-circuit condition, then battery charger normal operation in delay time；If power supply output is constantly in short-circuit condition in delay time, control signal delay circuit will send short-circuit protection signal and cut out battery charger to battery charger managing chip.This delay circuit is mainly used in strengthening the capacity of resisting disturbance of this protection circuit.
Short-circuit protection signal can be used to draw high the pressure feedback port of power management chip, stops battery charger operation.
Patent of the present invention provides the benefit that:
1, device provided by the present invention is adopted; adopt current peak limiting circuit within pulse width modulating chip to compared with carrying out short-circuit protection scheme with background technology is mentioned; owing to adopting time delay and stopping the mode of battery charger operation; significantly reduce operating current and the loss of battery charger during short-circuit protection, improve the reliability of battery charger.
2, adopt the mode of detection output electric current compared with carrying out short-circuit protection scheme, only to have used divider resistance due to this circuit and to have sampled with background technology is mentioned so that this circuit will not be subject to the increase of source nominal output electric current and volume and cost increase.
Accompanying drawing explanation
Accompanying drawing 1 is principles of the invention block diagram；
Accompanying drawing 2 is the circuit theory diagrams of the present invention.
Detailed description of the invention
Operation principle below in conjunction with Fig. 1,2 pairs of patents of the present invention is described further:
Patent of the present invention includes output voltage detecting circuit 1, protection voltage threshold arranges circuit 2 and control signal delay circuit 3.
Being formed start delay circuit by R8 ~ R12, Q1, U1B, C2 in Fig. 2, when battery charger is started shooting, U1A the 1st foot output low level can be pulled to low level by R8 and Q1 by U1B the 7th foot；VCC is slowly charged to C2 by R11 simultaneously, when C2 is charged to voltage higher than R9 and R10 dividing potential drop voltage (i.e. U1B the 6th foot voltage) out, U1B the 7th foot output high level turns off Q1 makes U1A the 1st foot voltage no longer be dragged down by force, the effect of start delay circuit leaves it at that, the time delay of this circuit to determine according to the short circuit duration that the charging interval of battery charger output capacitance (including the output capacitance of this power supply and the input capacitance of load) and battery charger can bear, time, too short power supply cannot start, oversize power supply and load may be brought infringement, time is usually arranged as between 0.5S ~ 1S；
Formed protection voltage threshold by R4 ~ R7 in Fig. 2 and circuit 2 is set, a reference voltage (i.e. U1A the 2nd foot voltage) is gone out by R4 and R5 dividing potential drop, the reference voltage of the protection threshold voltage (being generally the 10% ~ 20% of output voltage) that R6 and R7 converts out further according to battery charger output voltage and U1A the 2nd foot is to determine sampled voltage (i.e. U1A the 3rd foot voltage), when U1A the 3rd foot sampled voltage is lower than the reference voltage of U1A the 2nd foot, U1A the 1st foot exports high level at once, high level is again through D1, R3, R2, U2, D3, R1, signal is reached battery charger managing chip by the circuit of Q2 composition, again through the mode that battery charger managing chip pressure feedback port level is drawn high, battery charger cuts out；
nullBy R6 in Fig. 2、The voltage detecting circuit 1 of R7 composition，R6 one end is directly connected to battery charger output voltage，When short circuit phenomenon occurs，Detection voltage can fall to 0V moment，By C1 in Fig. 2、R6、The capacity of resisting disturbance of the control signal delay circuit more long battery charger of 3(control signal delay time of R7 composition is more strong，But must within the scope of the short circuit duration that battery charger can bear，Infringement is brought beyond power supply and load may be given，Time is usually arranged as between 100ms ~ 600ms)，Can slowly discharge，When being discharged to U1A the 3rd foot voltage lower than U1A the 2nd foot voltage，U1A the 1st foot can export high level，Again through D1、R3、R2、U2、D3、R1、Signal is reached battery charger managing chip and is closed by battery charger by the circuit of Q2 composition.
The short-circuit protection of electronic circuit provided by the present invention controls system and can be widely used in all kinds of battery charger apparatus, and when particularly requiring power supply short circuit, loss is little, and reliability is high and in the high occasion of small product size and cost requirement.
Invention described above embodiment, is not intended that limiting the scope of the present invention.Any amendment, equivalent replacement and improvement etc. made within the spirit and principles in the present invention, should be included within the claims of the present invention.
Claims (1)
1. the short-circuit protection of an electronic circuit controls system, it is characterised in that: include output voltage detecting circuit, protection voltage threshold arranges circuit and control signal delay circuit；
Described protection voltage threshold arranges circuit, is used for arranging short-circuit protection threshold voltage；
Described output voltage detecting circuit, for detecting whether output voltage has the phenomenon lower than short-circuit protection threshold voltage；
Described control signal delay circuit, when output voltage detecting circuit detects short circuit phenomenon, described control signal delay circuit can produce delay time, if power supply output departs from short-circuit condition, then battery charger normal operation in delay time；If power supply output is constantly in short-circuit condition in delay time, control signal delay circuit will send short-circuit protection signal and cut out battery charger to battery charger managing chip；This delay circuit is mainly used in strengthening the capacity of resisting disturbance of this protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410855379.4A CN105811376A (en) | 2014-12-31 | 2014-12-31 | Short circuit protection and control system of electronic circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410855379.4A CN105811376A (en) | 2014-12-31 | 2014-12-31 | Short circuit protection and control system of electronic circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105811376A true CN105811376A (en) | 2016-07-27 |
Family
ID=56465304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410855379.4A Pending CN105811376A (en) | 2014-12-31 | 2014-12-31 | Short circuit protection and control system of electronic circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105811376A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101697410A (en) * | 2009-10-23 | 2010-04-21 | 欣旺达电子股份有限公司 | Short-circuit protection circuit adopted in battery charger circuit |
| CN202142841U (en) * | 2011-06-24 | 2012-02-08 | 广州市君盘实业有限公司 | Switch power supply output short circuit protective circuit |
| CN102810897A (en) * | 2011-05-30 | 2012-12-05 | 海洋王照明科技股份有限公司 | Charging circuit with short-circuit protection and charger |
| CN104184132A (en) * | 2014-09-17 | 2014-12-03 | 中颖电子股份有限公司 | Dynamic overcurrent protection method for lithium batteries |
| CN105006801A (en) * | 2014-04-25 | 2015-10-28 | 任洪龙 | Short-circuit protection control system of battery charger |
-
2014
- 2014-12-31 CN CN201410855379.4A patent/CN105811376A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101697410A (en) * | 2009-10-23 | 2010-04-21 | 欣旺达电子股份有限公司 | Short-circuit protection circuit adopted in battery charger circuit |
| CN102810897A (en) * | 2011-05-30 | 2012-12-05 | 海洋王照明科技股份有限公司 | Charging circuit with short-circuit protection and charger |
| CN202142841U (en) * | 2011-06-24 | 2012-02-08 | 广州市君盘实业有限公司 | Switch power supply output short circuit protective circuit |
| CN105006801A (en) * | 2014-04-25 | 2015-10-28 | 任洪龙 | Short-circuit protection control system of battery charger |
| CN104184132A (en) * | 2014-09-17 | 2014-12-03 | 中颖电子股份有限公司 | Dynamic overcurrent protection method for lithium batteries |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202142841U (en) | Switch power supply output short circuit protective circuit | |
| CN104348214A (en) | Charger with overvoltage and overcurrent protection and protection method thereof | |
| CN104924910B (en) | High-tension distribution panel circuit | |
| CN102709882A (en) | Short circuit protection circuit of direct current power supply provided with precharging function | |
| CN103199505A (en) | Output short-circuit protection circuit for high tension battery | |
| CN103353569A (en) | Relay connection state detecting apparatus | |
| CN203368012U (en) | DC contactor combined circuit for electric automobile | |
| CN202651770U (en) | Motor phase loss protection circuit | |
| CN203193261U (en) | Protection circuit for output short circuit of high-voltage battery pack | |
| CN203761034U (en) | Over discharge protection device for storage battery | |
| CN103490376B (en) | For the over-and under-voltage protective device of single-phase source system | |
| CN106207979A (en) | Lithium cell charging protection controls device | |
| CN107979060B (en) | Charging and discharging circuit, power supply control circuit and control method | |
| CN204290266U (en) | A kind of current foldback circuit | |
| CN203574569U (en) | Positive and negative rotation drive device of cleaner dust pressing motor | |
| CN102158066B (en) | Direct-current (DC) power supply for guaranteeing fully stored energy of stored energy motors of breaker and load switch | |
| CN105006801A (en) | Short-circuit protection control system of battery charger | |
| CN204231006U (en) | For the outage detection protection system of aircraft data recording equipment | |
| CN105811376A (en) | Short circuit protection and control system of electronic circuit | |
| CN108574267A (en) | The short-circuit protection control system of battery charger | |
| CN106329488A (en) | Charger detection device for battery protection system | |
| CN107240907A (en) | Lithium cell charging protects control device | |
| CN106329605A (en) | Environmental-friendly and energy-saving charger | |
| CN106684952A (en) | Automatic charger recognition device | |
| CN106655104A (en) | Lithium battery charging protection control apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160727 |
|
| WD01 | Invention patent application deemed withdrawn after publication |