CN102810897A - Charging circuit with short-circuit protection and charger - Google Patents
Charging circuit with short-circuit protection and charger Download PDFInfo
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- CN102810897A CN102810897A CN2011101428249A CN201110142824A CN102810897A CN 102810897 A CN102810897 A CN 102810897A CN 2011101428249 A CN2011101428249 A CN 2011101428249A CN 201110142824 A CN201110142824 A CN 201110142824A CN 102810897 A CN102810897 A CN 102810897A
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Abstract
The invention discloses a charging circuit with short-circuit protection, which comprises a charging module, a protection diode and an anti-reverse diode, wherein the charging module comprises a voltage transforming and rectifying circuit, a control circuit, a switch circuit, a constant current circuit and a sampling circuit; the input end of the control circuit is connected with the output end of the voltage transforming and rectifying circuit and the sampling circuit, and the output end of the control circuit is connected with the input end of the switch circuit; the control circuit controls on/off of the switch circuit according to the sampling voltage of the sampling circuit, the output end of the switch circuit is connected with the input end of the constant current circuit, the output end of the constant current circuit is connected with the charging battery by the anti-reverse diode, the anode of the protection diode is connected with the input end of the switch circuit, and the cathode of the protection diode is connected with the output end of the charging circuit, when the output end of the charging circuit is in short circuit, the voltage of the input end of the switch circuit is pulled down by the protection diode, so that the switch circuit is cut off. The charging circuit with short-circuit protection is simple and reliable, and saves the circuit cost.
Description
[technical field]
The present invention relates to charging circuit, relate in particular to a kind of charging circuit, charger with short-circuit protection.
[background technology]
The output of traditional charger does not have short-circuit protection function usually, and when the output accidental short circuit, charging circuit just can damage, and the charger that damages like this can't be repaired usually.Also there is employing application-specific integrated circuit (ASIC) (IC) to come the output of charger is carried out short-circuit protection, but its complicated circuit, and cost is high.
[summary of the invention]
Based on this, be necessary to provide a kind of charging circuit of simple and reliable, cost-effective band short-circuit protection.
A kind of charging circuit with short-circuit protection; Comprise charging module, protection diode and counnter attack diode; Said charging module comprises transformation rectification circuit, control circuit, switching circuit, constant-current circuit and sample circuit, and the input of said control circuit links to each other with the output and the sample circuit of said transformation rectification circuit, and output links to each other with the input of said switching circuit; Said control circuit is controlled the conducting of said switching circuit according to the sampled voltage of said sample circuit and is ended; The output of said switching circuit links to each other with the input of said constant-current circuit, and the output of said constant-current circuit links to each other with rechargeable battery through the counnter attack diode, and the positive pole of said protection diode links to each other with the input of said switching circuit; Negative pole links to each other with the output of charging circuit; During the output short circuit of said charging circuit, the input terminal voltage of said switching circuit drags down through said protection diode, and said switching circuit is ended.
Preferably; Said control circuit comprises protective resistance, voltage-stabiliser tube, first adjustable resistance and operational amplifier, and an end of said protective resistance is connected with the output of transformation rectification circuit, and the other end is through said voltage-stabiliser tube ground connection; Said first adjustable resistance is parallelly connected with said voltage-stabiliser tube; The in-phase input end of said operational amplifier links to each other with the adjustable side of said first adjustable resistance, and inverting input links to each other with said sample circuit, and output links to each other with the input of said switching circuit.
Preferably, said control circuit also comprises first storage capacitor and filter capacitor, and said first storage capacitor, one end links to each other with the output of transformation rectification circuit, other end ground connection, and said filter capacitor is parallelly connected with said first storage capacitor.
Preferably; Said switching circuit comprises first triode and dividing potential drop diode; The grounded emitter of said first triode; Base stage links to each other with the negative pole of said dividing potential drop diode, and collector electrode links to each other with the input of said constant-current circuit, and the positive pole of said dividing potential drop diode links to each other with the output of said control circuit.
Preferably; Said constant-current circuit comprises second triode and second adjustable resistance; The base stage of said second triode links to each other with the collector electrode of said first triode; Emitter links to each other with the output of transformation rectification circuit through said second adjustable resistance, and collector electrode links to each other with rechargeable battery through said counnter attack diode.
Preferably; Said constant-current circuit also comprises light-emitting diode, and the positive pole of said light-emitting diode links to each other with the output of transformation rectification circuit, and negative pole links to each other with the base stage of said second triode; Said light-emitting diode is lighted when said switching circuit conducting, said switching circuit by the time extinguish.
Preferably; Said sample circuit comprises second storage capacitor, sampling resistor and divider resistance; Said sampling resistor one end ground connection; The other end links to each other with the collector electrode of said second triode with said divider resistance series connection back, and said sampling resistor links to each other with the inverting input of said operational amplifier with the junction of said divider resistance, and said second storage capacitor and said sampling resistor, divider resistance are parallelly connected.
Preferably, said transformation rectification circuit comprises transformer and rectifier, and the primary coil of said transformer links to each other with civil power, and secondary coil links to each other with the input of said rectifier, an end ground connection of the output of said rectifier.
Preferably, said charging circuit also comprises isolating diode, and the positive pole of said isolating diode links to each other with direct current, and negative pole links to each other with the other end of the output of said rectifier.
In addition, a kind of charger that comprises the charging circuit of above-mentioned band short-circuit protection also is provided.
The charging circuit of above-mentioned band short-circuit protection and charger when the output short circuit of charger, through the protection diode, make that the input terminal voltage of switching circuit is dragged down, thereby switching circuit end, and charger stops charging.Therefore when the output accidental short circuit of charger, can effectively protect charger.Realize short-circuit protection through simple protection diode, simple and reliable, can effectively save circuit cost.
[description of drawings]
The structural representation of the charging circuit of the band short-circuit protection that Fig. 1 provides for embodiment one;
The structural representation of the charging circuit of the band short-circuit protection that Fig. 2 provides for embodiment two.
[embodiment]
The charging circuit of band short-circuit protection provided by the invention; Comprise charging module, protection diode and counnter attack diode; Charging module comprises transformation rectification circuit, control circuit, switching circuit, constant-current circuit and sample circuit, and the input of control circuit links to each other with the output and the sample circuit of said transformation rectification circuit, and the output of control circuit links to each other with the input of switching circuit; Control circuit is according to the conducting of the sampled voltage control switch circuit of sample circuit and end; The output of switching circuit links to each other with the input of constant-current circuit, and the output of constant-current circuit links to each other with rechargeable battery through the counnter attack diode, and the positive pole of protection diode links to each other with the input of switching circuit; Negative pole links to each other with the output of charging circuit; During the output short circuit of charging circuit, the input terminal voltage of switching circuit drags down through the protection diode, and switching circuit is ended.
Embodiment one
As shown in Figure 1; The charging circuit of band short-circuit protection comprises charging module 10, protection diode 20 and counnter attack diode 30; Wherein: charging module 10 comprises transformation rectification circuit 11, control circuit 12, switching circuit 13, constant-current circuit 14 and sample circuit 15, wherein:
The input of transformation rectification circuit 11 links to each other with civil power; The input of control circuit 12 links to each other with the output and the sample circuit 15 of transformation rectification circuit 11; The output of control circuit 12 links to each other with the input of switching circuit 13; The output of switching circuit 13 links to each other with the input of constant-current circuit 14, and the output of constant-current circuit 14 links to each other with rechargeable battery through counnter attack diode 30.Control circuit 12 is according to the conducting of the sampled voltage control switch circuit 13 of sample circuit 15 and end; When switching circuit 13 conductings; Charging circuit charges to rechargeable battery; When switching circuit 13 ended, charging circuit stopped the rechargeable battery charging, and rechargeable battery discharged to charging circuit when counnter attack diode 30 can prevent to cut off the electricity supply after charging from accomplishing.
The positive pole of protection diode 20 links to each other with the input of switching circuit 13; Negative pole links to each other with the output (being the input of rechargeable battery) of charging circuit; When the output short circuit of charging circuit, the input terminal voltage of switching circuit 13 drags down through protection diode 20, and switching circuit 13 is ended; Charging circuit stops charging, thereby has realized short-circuit protection function.Because can realize short-circuit protection function through a protection diode 20, its circuit is simple and reliable, response speed is fast, also can save circuit cost.
In other execution mode, the input of control circuit 12 also can connect direct current, and for example the power supply of vehicle-mounted 12V can be realized through civil power rechargeable battery being charged like this, also can charge to rechargeable battery through vehicle power, uses more convenient.
Embodiment two
As shown in Figure 2; The charging circuit of band short-circuit protection comprises charging module 10, protection diode D6 and counnter attack diode D2; Wherein: charging module 10 comprises transformation rectification circuit 11, control circuit 12, switching circuit 13, constant-current circuit 14 and sample circuit 15, wherein:
As shown in Figure 2; Control circuit 12 comprises protective resistance R1, voltage-stabiliser tube D4, the first adjustable resistance Rw1 and operational amplifier OP1; The end of protective resistance R1 links to each other with the output 2 of rectifier D3, and the other end is through voltage-stabiliser tube D4 ground connection, and the first adjustable resistance Rw1 is parallelly connected with voltage-stabiliser tube D4.Among this embodiment, the resistance R 2 of connecting with first adjustable resistance can be set also.The in-phase input end of operational amplifier OP1 links to each other with the adjustable side of the first adjustable resistance Rw1, and sampling resistor R7 in inverting input and the sample circuit 15 and the junction of divider resistance R8 link to each other, and output links to each other with the input of switching circuit 13 through resistance R 3.
Among this embodiment, control circuit 12 also comprises the first storage capacitor C1 and filter capacitor C3, and the end of the first storage capacitor C1 links to each other with the output 2 of rectifier D3, other end ground connection, and filter capacitor C3 is parallelly connected with the first storage capacitor C1.
Switching circuit 13 comprises the first triode Q1, the first dividing potential drop diode D7 and the second dividing potential drop diode D8; The end of the first dividing potential drop diode D7 links to each other with resistance R 3; The other end links to each other with the base stage of the first triode Q1 through the second dividing potential drop diode D8; The grounded emitter of the first triode Q1, collector electrode links to each other with the input of constant-current circuit 206, and the first triode Q1 is also through resistance R 4 ground connection.In other embodiments, the first dividing potential drop diode D7 and the second dividing potential drop diode D8 also can adopt a dividing potential drop diode or divider resistance to realize.
Constant-current circuit 14 comprises the second triode Q2 and the second adjustable resistance Rw2; The base stage of the second triode Q2 links to each other with the collector electrode of the first triode Q1 through resistance R 5; Emitter is connected with the second adjustable resistance Rw2 through resistance R 6; And link to each other with the output 2 of rectifier D3 through the second adjustable resistance Rw2, the collector electrode of the second triode Q2 links to each other with rechargeable battery BT through counnter attack diode D2.Among this embodiment; Constant-current circuit 14 also comprises light-emitting diode D5, and the positive pole of light-emitting diode D5 links to each other with the output 2 of rectifier D3, and negative pole links to each other with the base stage of the second triode Q2; Light-emitting diode D5 lights when switching circuit 13 conductings, when switching circuit 13 ends, extinguishes.
Among this embodiment; The positive pole of protection diode D6 links to each other with the input of switching circuit 13, and negative pole links to each other with the output (being the input of rechargeable battery) of charging circuit, when the output short circuit of charging circuit; The input terminal voltage of switching circuit 13 drags down through protection diode D6; Switching circuit 13 is ended, and charging circuit stops charging, thereby has realized short-circuit protection function.
The charging circuit that present embodiment provides can cut off charging automatically after being full of electricity, principle is following:
According to the charging circuit that this embodiment provides, it is VB=VR* (R7+R8)/R7-VD2 that charging voltage is set, and charging current is IQ2c=(VD5-VQ2be)/(Rw2+R6).Through regulating the first adjustable resistance Rw1; When making charging, the in-phase input end voltage VR of operational amplifier OP1 is than inverting input voltage (being the sampled voltage of sample circuit 15) height, and the output of operational amplifier OP1 is then exported high level when charging like this; Because the output of operational amplifier OP1 output high level; The first triode Q1 conducting is given rechargeable battery BT charging through constant-current circuit 14 backs again, and this moment, light-emitting diode D5 lighted.When rechargeable battery BT charges to the charging voltage VB of setting; The in-phase input end voltage VR of operational amplifier OP1 is lower than inverting input voltage; The output of operational amplifier OP1 is output low level then; The first triode Q1 ends, and charging circuit stops rechargeable battery BT charging, thus function of automatically cutting off when realizing being full of electricity.Because this moment, the first triode Q1 ended, light-emitting diode D5 extinguishes.
The charging circuit that present embodiment provides can be realized short-circuit protection function, and principle is following:
When the output short circuit of charging circuit; The output end voltage Vp of control circuit 12 drags down rapidly through protection diode D6; Voltage Vp when charging circuit is worked; For example, voltage Vp is pulled low to about 1V rapidly through protection diode D6, and required voltage Vp is about 2.1V during charging circuit work.The first dividing potential drop diode D7 and the second dividing potential drop diode D8 are used for increasing the conducting voltage of Vp; That is to say; When voltage Vp drags down rapidly through protection diode D6; Because the dividing potential drop of the first dividing potential drop diode D7 and the second dividing potential drop diode D8 makes the base voltage of the triode Q1 that wins lower, has improved the reliability of short-circuit protection.Because Vp drags down, make the triode Q1 that wins by (collector electrode that is equivalent to the first triode Q1 is unsettled), and the second triode Q2 also end, 14 of constant-current circuits can't be worked, and charging circuit cuts off automatically, thereby realizes short-circuit protection function.Because this moment, the first triode Q1 ended, light-emitting diode D5 extinguishes.After short circuit was eliminated, the voltage when the output end voltage Vp of control circuit 12 reverts to charging circuit work rapidly made the triode Q1 conducting of winning, and light-emitting diode D5 lights, constant-current circuit 14 operate as normal, so charging circuit recovers charging automatically.
The charger of the charging circuit that comprises above-mentioned band short-circuit protection also is provided in another embodiment.
The charging circuit of above-mentioned band short-circuit protection and charger when the output short circuit of charger, through protection diode D6, make that the input terminal voltage of switching circuit 13 is dragged down, thereby switching circuit 13 end, and charger stops charging.Therefore when the output accidental short circuit of charger, can effectively protect charger.Realize short-circuit protection through simple protection diode D6, simple and reliable and response speed is fast, also can effectively save circuit cost.Because charger can be effectively protected during the output short circuit of charger, makes charger can not damage because of short circuit, has prolonged the useful life of charger, has saved maintenance cost.
The above embodiment has only expressed several kinds of execution modes of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the present invention's design, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with accompanying claims.
Claims (10)
1. charging circuit with short-circuit protection; It is characterized in that comprise charging module, protection diode and counnter attack diode, said charging module comprises transformation rectification circuit, control circuit, switching circuit, constant-current circuit and sample circuit; The input of said control circuit links to each other with the output and the sample circuit of said transformation rectification circuit; The output of said control circuit links to each other with the input of said switching circuit, and said control circuit is controlled the conducting of said switching circuit according to the sampled voltage of said sample circuit and ended, and the output of said switching circuit links to each other with the input of said constant-current circuit; The output of said constant-current circuit links to each other with rechargeable battery through the counnter attack diode; The positive pole of said protection diode links to each other with the input of said switching circuit, and negative pole links to each other with the output of charging circuit, during the output short circuit of said charging circuit; The input terminal voltage of said switching circuit drags down through said protection diode, and said switching circuit is ended.
2. the charging circuit of band short-circuit protection according to claim 1; It is characterized in that; Said control circuit comprises protective resistance, voltage-stabiliser tube, first adjustable resistance and operational amplifier, and an end of said protective resistance is connected with the output of transformation rectification circuit, and the other end is through said voltage-stabiliser tube ground connection; Said first adjustable resistance is parallelly connected with said voltage-stabiliser tube; The in-phase input end of said operational amplifier links to each other with the adjustable side of said first adjustable resistance, and inverting input links to each other with said sample circuit, and output links to each other with the input of said switching circuit.
3. the charging circuit of band short-circuit protection according to claim 1; It is characterized in that; Said control circuit also comprises first storage capacitor and filter capacitor; Said first storage capacitor, one end links to each other with the output of transformation rectification circuit, other end ground connection, and said filter capacitor is parallelly connected with said first storage capacitor.
4. the charging circuit of band short-circuit protection according to claim 1; It is characterized in that; Said switching circuit comprises first triode and dividing potential drop diode, the grounded emitter of said first triode, and base stage links to each other with the negative pole of said dividing potential drop diode; Collector electrode links to each other with the input of said constant-current circuit, and the positive pole of said dividing potential drop diode links to each other with the output of said control circuit.
5. the charging circuit of band short-circuit protection according to claim 4; It is characterized in that; Said constant-current circuit comprises second triode and second adjustable resistance; The base stage of said second triode links to each other with the collector electrode of said first triode, and emitter links to each other with the output of transformation rectification circuit through said second adjustable resistance, and collector electrode links to each other with rechargeable battery through said counnter attack diode.
6. the charging circuit of band short-circuit protection according to claim 5; It is characterized in that; Said constant-current circuit also comprises light-emitting diode, and the positive pole of said light-emitting diode links to each other with the output of transformation rectification circuit, and negative pole links to each other with the base stage of said second triode; Said light-emitting diode is lighted when said switching circuit conducting, said switching circuit by the time extinguish.
7. according to the charging circuit of claim 5 or 6 described band short-circuit protections; It is characterized in that; Said sample circuit comprises second storage capacitor, sampling resistor and divider resistance, said sampling resistor one end ground connection, and the other end links to each other with the collector electrode of said second triode with said divider resistance series connection back; Said sampling resistor links to each other with the inverting input of said operational amplifier with the junction of said divider resistance, and said second storage capacitor and said sampling resistor, divider resistance are parallelly connected.
8. the charging circuit of band short-circuit protection according to claim 1; It is characterized in that; Said transformation rectification circuit comprises transformer and rectifier; The primary coil of said transformer links to each other with civil power, and secondary coil links to each other with the input of said rectifier, an end ground connection of the output of said rectifier.
9. the charging circuit of band short-circuit protection according to claim 8 is characterized in that, said charging circuit also comprises isolating diode, and the positive pole of said isolating diode links to each other with direct current, and negative pole links to each other with the other end of the output of said rectifier.
10. a charger is characterized in that, comprises the charging circuit of any described band short-circuit protection in the claim 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110142824.9A CN102810897B (en) | 2011-05-30 | 2011-05-30 | Charging circuit with short-circuit protection and charger |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110142824.9A CN102810897B (en) | 2011-05-30 | 2011-05-30 | Charging circuit with short-circuit protection and charger |
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| CN102810897A true CN102810897A (en) | 2012-12-05 |
| CN102810897B CN102810897B (en) | 2015-03-11 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104079046A (en) * | 2013-03-26 | 2014-10-01 | 深圳市海洋王照明工程有限公司 | Charging circuit of battery |
| CN104076852A (en) * | 2013-03-27 | 2014-10-01 | 海洋王（东莞）照明科技有限公司 | Serial voltage stabilizing circuit for switching power supply |
| CN104184199A (en) * | 2013-05-22 | 2014-12-03 | 海洋王（东莞）照明科技有限公司 | Cell charging circuit and device |
| CN104578277A (en) * | 2014-12-24 | 2015-04-29 | 广东欧珀移动通信有限公司 | Method for charging electronic equipment and electronic equipment |
| CN105811376A (en) * | 2014-12-31 | 2016-07-27 | 徐承金 | Short circuit protection and control system of electronic circuit |
| CN107769318A (en) * | 2017-11-03 | 2018-03-06 | 深圳锐源微电子科技有限公司 | Charging circuit, device, intelligent terminal and charging method |
| CN109088391A (en) * | 2018-09-18 | 2018-12-25 | Tcl-罗格朗国际电工（惠州）有限公司 | Short-circuit protection circuit and nonstandard POE charger |
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| CN2689567Y (en) * | 2003-10-09 | 2005-03-30 | 孙泉龄 | Charger of automatic battery |
| CN201008094Y (en) * | 2007-03-02 | 2008-01-16 | 青岛海信电器股份有限公司 | Power supply circuit with short circuit protection |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2689567Y (en) * | 2003-10-09 | 2005-03-30 | 孙泉龄 | Charger of automatic battery |
| CN201008094Y (en) * | 2007-03-02 | 2008-01-16 | 青岛海信电器股份有限公司 | Power supply circuit with short circuit protection |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104079046A (en) * | 2013-03-26 | 2014-10-01 | 深圳市海洋王照明工程有限公司 | Charging circuit of battery |
| CN104076852A (en) * | 2013-03-27 | 2014-10-01 | 海洋王（东莞）照明科技有限公司 | Serial voltage stabilizing circuit for switching power supply |
| CN104184199A (en) * | 2013-05-22 | 2014-12-03 | 海洋王（东莞）照明科技有限公司 | Cell charging circuit and device |
| CN104184199B (en) * | 2013-05-22 | 2017-02-08 | 海洋王（东莞）照明科技有限公司 | Cell charging circuit and device |
| CN104578277A (en) * | 2014-12-24 | 2015-04-29 | 广东欧珀移动通信有限公司 | Method for charging electronic equipment and electronic equipment |
| CN105811376A (en) * | 2014-12-31 | 2016-07-27 | 徐承金 | Short circuit protection and control system of electronic circuit |
| CN107769318A (en) * | 2017-11-03 | 2018-03-06 | 深圳锐源微电子科技有限公司 | Charging circuit, device, intelligent terminal and charging method |
| CN107769318B (en) * | 2017-11-03 | 2021-01-01 | 深圳锐源微电子科技有限公司 | Charging circuit, charging device, intelligent terminal and charging method |
| CN109088391A (en) * | 2018-09-18 | 2018-12-25 | Tcl-罗格朗国际电工（惠州）有限公司 | Short-circuit protection circuit and nonstandard POE charger |
| CN109088391B (en) * | 2018-09-18 | 2023-10-17 | 罗格朗智能电气(惠州)有限公司 | Short-circuit protection circuit and nonstandard POE power supply |
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|---|---|
| CN102810897B (en) | 2015-03-11 |
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