CN102810897B - Charging circuit with short-circuit protection and charger - Google Patents

Charging circuit with short-circuit protection and charger Download PDF

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Publication number
CN102810897B
CN102810897B CN201110142824.9A CN201110142824A CN102810897B CN 102810897 B CN102810897 B CN 102810897B CN 201110142824 A CN201110142824 A CN 201110142824A CN 102810897 B CN102810897 B CN 102810897B
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China
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circuit
output
charging
diode
protection
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CN201110142824.9A
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Chinese (zh)
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CN102810897A (en
Inventor
周明杰
管伟芳
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海洋王照明科技股份有限公司
深圳市海洋王照明工程有限公司
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Priority to CN201110142824.9A priority Critical patent/CN102810897B/en
Publication of CN102810897A publication Critical patent/CN102810897A/en
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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

Charging circuit with short-circuit protection, charger

[technical field]

The present invention relates to charging circuit, particularly relate 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 output accidental short circuit, charging circuit just can damage, and the charger damaged like this cannot be repaired usually.Also have employing application-specific integrated circuit (ASIC) (IC) to carry out short-circuit protection to the output of charger, but its circuit is complicated, and cost is high.

[summary of the invention]

Based on this, be necessary the charging circuit that a kind of simple and reliable, cost-effective band short-circuit protection is provided.

A kind of charging circuit with short-circuit protection, comprise charging module, protection diode and counnter attack diode, described charging module comprises Transformer Rectifier circuit, control circuit, switching circuit, constant-current circuit and sample circuit, the input of described control circuit is connected with the output of described Transformer Rectifier circuit and sample circuit, output is connected with the input of described switching circuit, described control circuit controls conducting and the cut-off of described switching circuit according to the sampled voltage of described sample circuit, the output of described switching circuit is connected with the input of described constant-current circuit, the output of described constant-current circuit is connected with rechargeable battery by counnter attack diode, the positive pole of described protection diode is connected with the input of described switching circuit, negative pole is connected with the output of charging circuit, during the output short circuit of described charging circuit, the input terminal voltage of described switching circuit is dragged down by described protection diode, described switching circuit is ended.

Preferably; described control circuit comprises protective resistance, voltage-stabiliser tube, the first adjustable resistance and operational amplifier; one end of described protective resistance is connected with the output of Transformer Rectifier circuit; the other end is by described voltage-stabiliser tube ground connection; described first adjustable resistance is in parallel with described voltage-stabiliser tube; the in-phase input end of described operational amplifier is connected with the adjustable side of described first adjustable resistance, and inverting input is connected with described sample circuit, and output is connected with the input of described switching circuit.

Preferably, described control circuit also comprises the first storage capacitor and filter capacitor, and described first storage capacitor one end is connected with the output of Transformer Rectifier circuit, other end ground connection, and described filter capacitor is in parallel with described first storage capacitor.

Preferably, described switching circuit comprises the first triode and dividing potential drop diode, the grounded emitter of described first triode, base stage is connected with the negative pole of described dividing potential drop diode, collector electrode is connected with the input of described constant-current circuit, and the positive pole of described dividing potential drop diode is connected with the output of described control circuit.

Preferably, described constant-current circuit comprises the second triode and the second adjustable resistance, the base stage of described second triode is connected with the collector electrode of described first triode, emitter is connected with the output of Transformer Rectifier circuit by described second adjustable resistance, and collector electrode is connected with rechargeable battery by described counnter attack diode.

Preferably, described constant-current circuit also comprises light-emitting diode, and the positive pole of described light-emitting diode is connected with the output of Transformer Rectifier circuit, and negative pole is connected with the base stage of described second triode, described light-emitting diode is lighted when described switching circuit conducting, extinguishes when described switching circuit cut-off.

Preferably, described sample circuit comprises the second storage capacitor, sampling resistor and divider resistance, described sampling resistor one end ground connection, the other end is connected with the collector electrode of described second triode after connecting with described divider resistance, described sampling resistor is connected with the inverting input of described operational amplifier with the junction of described divider resistance, and described second storage capacitor and described sampling resistor, divider resistance are in parallel.

Preferably, described Transformer Rectifier circuit comprises transformer and rectifier, and the primary coil of described transformer is connected with civil power, and secondary coil is connected with the input of described rectifier, one end ground connection of the output of described rectifier.

Preferably, described charging circuit also comprises isolating diode, and the positive pole of described isolating diode is connected with direct current, and negative pole is connected with the other end of the output of described rectifier.

In addition, a kind of charger comprising the charging circuit of above-mentioned band short-circuit protection is additionally provided.

The charging circuit of above-mentioned band short-circuit protection and charger, when the output short circuit of charger, by protection diode, make the input terminal voltage of switching circuit be dragged down, thus switching circuit cut-off, charger stops charging.Therefore can available protecting charger when the output accidental short circuit of charger.By simply protecting diode to realize short-circuit protection, simple and reliable, effectively can save circuit cost.

[accompanying drawing explanation]

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 Transformer Rectifier circuit, control circuit, switching circuit, constant-current circuit and sample circuit, the input of control circuit is connected with the output of described Transformer Rectifier circuit and sample circuit, the output of control circuit is connected with the input of switching circuit, control circuit is according to the conducting of the sampled voltage control switch circuit of sample circuit and cut-off, the output of switching circuit is connected with the input of constant-current circuit, the output of constant-current circuit is connected with rechargeable battery by counnter attack diode, the protection positive pole of diode is connected with the input of switching circuit, negative pole is connected with the output of charging circuit, during the output short circuit of charging circuit, the input terminal voltage of switching circuit is dragged down by protection diode, switching circuit is ended.

Embodiment one

As shown in Figure 1; charging circuit with short-circuit protection comprises charging module 10, protection diode 20 and counnter attack diode 30; wherein: charging module 10 comprises Transformer Rectifier circuit 11, control circuit 12, switching circuit 13, constant-current circuit 14 and sample circuit 15, wherein:

The input of Transformer Rectifier circuit 11 is connected with civil power, the input of control circuit 12 is connected with the output of Transformer Rectifier circuit 11 and sample circuit 15, the output of control circuit 12 is connected with the input of switching circuit 13, the output of switching circuit 13 is connected with the input of constant-current circuit 14, and the output of constant-current circuit 14 is connected with rechargeable battery by 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 cut-off, when switching circuit 13 conducting, charging circuit charges to rechargeable battery, when switching circuit 13 ends, charging circuit stops rechargeable battery charging, and when counnter attack diode 30 is cut off the electricity supply after can preventing charging complete, rechargeable battery discharges to charging circuit.

The positive pole of protection diode 20 is connected with the input of switching circuit 13; negative pole is connected with the output (i.e. the input of rechargeable battery) of charging circuit; when the output short circuit of charging circuit; the input terminal voltage of switching circuit 13 is dragged down by protection diode 20; switching circuit 13 is ended; charging circuit stops charging, thus achieves short-circuit protection function.Owing to can realize short-circuit protection function by a protection diode 20, its circuit is simple and reliable, fast response time, also can save circuit cost.

In other implementations, the input of control circuit 12 also can connect direct current, such as the power supply of vehicle-mounted 12V, can realize like this being charged to rechargeable battery by civil power, also charge to rechargeable battery by vehicle power, use more convenient.

Embodiment two

As shown in Figure 2; charging circuit with short-circuit protection comprises charging module 10, protection diode D6 and counnter attack diode D2; wherein: charging module 10 comprises Transformer Rectifier circuit 11, control circuit 12, switching circuit 13, constant-current circuit 14 and sample circuit 15, wherein:

Transformer Rectifier circuit 11 comprises transformer T1 and rectifier D3, the primary coil of transformer T1 is connected with civil power, secondary coil is connected with 3 with the input 1 of rectifier D3, output 4 ground connection of rectifier D3,220V civil power is converted to low-voltage by transformer T1, by rectifier D3, alternating current is converted to direct current.Charging circuit also comprises isolating diode D1, and the positive pole of isolating diode D1 is connected with direct current, and negative pole is connected with the output 2 of rectifier D3, and isolating diode D1 is for isolating influencing each other of alternating current and powered by direct current power supply.The charging circuit that the present embodiment provides both can be charged to rechargeable battery BT by 220V alternating current, also can pass through DC power supply (such as vehicle-mounted 12V power supply) and charge to rechargeable battery BT.

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; one end of protective resistance R1 is connected with the output 2 of rectifier D3, and the other end is by voltage-stabiliser tube D4 ground connection, and the first adjustable resistance Rw1 is in parallel with voltage-stabiliser tube D4.In this embodiment, the resistance R2 connected with the first adjustable resistance also can be set.The in-phase input end of operational amplifier OP1 is connected with the adjustable side of the first adjustable resistance Rw1, and inverting input is connected with the junction of divider resistance R8 with the sampling resistor R7 in sample circuit 15, and output is connected with the input of switching circuit 13 by resistance R3.

In this embodiment, control circuit 12 also comprises the first storage capacitor C1 and filter capacitor C3, and one end of the first storage capacitor C1 is connected with the output 2 of rectifier D3, other end ground connection, and filter capacitor C3 is in parallel 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, one end of first dividing potential drop diode D7 is connected with resistance R3, the other end is connected with the base stage of the first triode Q1 by the second dividing potential drop diode D8, the grounded emitter of the first triode Q1, collector electrode is connected with the input of constant-current circuit 206, and the first triode Q1 is also by resistance R4 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 is connected with the collector electrode of the first triode Q1 by resistance R5, emitter is connected with the second adjustable resistance Rw2 by resistance R6, and be connected with the output 2 of rectifier D3 by the second adjustable resistance Rw2, the collector electrode of the second triode Q2 is connected with rechargeable battery BT by counnter attack diode D2.In this embodiment, constant-current circuit 14 also comprises light-emitting diode D5, and the positive pole of light-emitting diode D5 is connected with the output 2 of rectifier D3, and negative pole is connected with the base stage of the second triode Q2, light-emitting diode D5 lights when switching circuit 13 conducting, extinguishes when switching circuit 13 ends.

Sample circuit 15 comprises the second storage capacitor C2, sampling resistor R7 and divider resistance R8, sampling resistor R7 one end ground connection, the other end is connected with the collector electrode of the second triode Q2 after connecting with divider resistance R8, sampling resistor R7 is connected with the inverting input of operational amplifier OP1 with the junction of divider resistance R8, and namely the sampled voltage of sample circuit 15 is as the anti-phase input terminal voltage of operational amplifier OP1.Second storage capacitor C2 is then in parallel with sampling resistor R7, divider resistance R8.

In this embodiment; the positive pole of protection diode D6 is connected with the input of switching circuit 13; negative pole is connected with the output (i.e. the input of rechargeable battery) of charging circuit; when the output short circuit of charging circuit; the input terminal voltage of switching circuit 13 is dragged down by protection diode D6; switching circuit 13 is ended, and charging circuit stops charging, thus achieves short-circuit protection function.

The charging circuit that the present embodiment provides automatically can cut off charging after being full of electricity, and principle is as follows:

According to the charging circuit that this embodiment provides, arranging charging voltage is VB=VR* (R7+R8)/R7-VD2, and charging current is IQ2c=(VD5-VQ2be)/(Rw2+R6).By regulating the first adjustable resistance Rw1, when making charging, the in-phase input end voltage VR of operational amplifier OP1 is higher than anti-phase input terminal voltage (i.e. the sampled voltage of sample circuit 15), during such charging, the output of operational amplifier OP1 then exports high level, because the output of operational amplifier OP1 exports high level, first triode Q1 conducting, then by charging to after constant-current circuit 14 rechargeable battery BT, now light-emitting diode D5 lights.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 anti-phase input terminal voltage, the output then output low level of operational amplifier OP1, first triode Q1 ends, charging circuit stops charging to rechargeable battery BT, thus function of automatically cutting off when realizing being full of electricity.Because now the first triode Q1 ends, light-emitting diode D5 extinguishes.

The charging circuit that the present embodiment provides can realize short-circuit protection function, and principle is as follows:

When the output short circuit of charging circuit; the output end voltage Vp of control circuit 12 is dragged down rapidly by protection diode D6; voltage Vp when working much smaller than charging circuit; such as; voltage Vp is pulled low to about 1V rapidly by protection diode D6, and during charging circuit work, required voltage Vp is about 2.1V.First dividing potential drop diode D7 and the second dividing potential drop diode D8 is used for increasing the conducting voltage of Vp; that is; when voltage Vp is dragged down rapidly by protection diode D6; due to the dividing potential drop of the first dividing potential drop diode D7 and the second dividing potential drop diode D8; make the base voltage of the first triode Q1 lower, improve the reliability of short-circuit protection.Because Vp drags down, make the first triode Q1 end (collector electrode being equivalent to the first triode Q1 is unsettled), and the second triode Q2 also ends, constant-current circuit 14 cannot work, and charging circuit cuts off automatically, thus realizes short-circuit protection function.Because now the first triode Q1 ends, light-emitting diode D5 extinguishes.After short circuit is eliminated, the output end voltage Vp of control circuit 12 reverts to rapidly voltage when charging circuit works, and make the first triode Q1 conducting, light-emitting diode D5 lights, and constant-current circuit 14 normally works, and therefore charging circuit recovers charging automatically.

In another embodiment, the charger of providing package containing the charging circuit of above-mentioned band short-circuit protection is gone back.

The charging circuit of above-mentioned band short-circuit protection and charger, when the output short circuit of charger, by protection diode D6, the input terminal voltage of switching circuit 13 is dragged down, thus switching circuit 13 ends, charger stops charging.Therefore can available protecting charger when the output accidental short circuit of charger.By simply protecting diode D6 to realize short-circuit protection, simple and reliable and fast response time, also effectively can save circuit cost.During output short circuit due to charger, charger can be effectively protected, and charger can not be damaged because of short circuit, extend the useful life of charger, save maintenance cost.

The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, 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 claims.

Claims (9)

1. the charging circuit with short-circuit protection, it is characterized in that, comprise charging module, protection diode and counnter attack diode, described charging module comprises Transformer Rectifier circuit, control circuit, switching circuit, constant-current circuit and sample circuit, the input of described control circuit is connected with the output of described Transformer Rectifier circuit and sample circuit, the output of described control circuit is connected with the input of described switching circuit, described control circuit controls conducting and the cut-off of described switching circuit according to the sampled voltage of described sample circuit, when described switching circuit conducting, described charging circuit charges to rechargeable battery, when described switching circuit cut-off, described charging circuit stops charging to rechargeable battery, thus function of automatically cutting off when realizing being full of electricity, the output of described switching circuit is connected with the input of described constant-current circuit, the output of described constant-current circuit is connected with rechargeable battery by counnter attack diode, the positive pole of described protection diode is connected with the input of described switching circuit, negative pole is connected with the output of charging circuit, during the output short circuit of described charging circuit, the input terminal voltage of described switching circuit is dragged down by described protection diode, and described switching circuit is ended, described control circuit comprises protective resistance, voltage-stabiliser tube, the first adjustable resistance and operational amplifier, one end of described protective resistance is connected with the output of Transformer Rectifier circuit, the other end is by described voltage-stabiliser tube ground connection, described first adjustable resistance is in parallel with described voltage-stabiliser tube, the in-phase input end of described operational amplifier is connected with the adjustable side of described first adjustable resistance, inverting input is connected with described sample circuit, and output is connected with the input of described switching circuit.
2. the charging circuit of band short-circuit protection according to claim 1; it is characterized in that; described control circuit also comprises the first storage capacitor and filter capacitor; described first storage capacitor one end is connected with the output of Transformer Rectifier circuit; other end ground connection, described filter capacitor is in parallel with described first storage capacitor.
3. the charging circuit of band short-circuit protection according to claim 1; it is characterized in that; described switching circuit comprises the first triode and dividing potential drop diode; the grounded emitter of described first triode; base stage is connected with the negative pole of described dividing potential drop diode; collector electrode is connected with the input of described constant-current circuit, and the positive pole of described dividing potential drop diode is connected with the output of described control circuit.
4. the charging circuit of band short-circuit protection according to claim 3; it is characterized in that; described constant-current circuit comprises the second triode and the second adjustable resistance; the base stage of described second triode is connected with the collector electrode of described first triode; emitter is connected with the output of Transformer Rectifier circuit by described second adjustable resistance, and collector electrode is connected with rechargeable battery by described counnter attack diode.
5. the charging circuit of band short-circuit protection according to claim 4; it is characterized in that; described constant-current circuit also comprises light-emitting diode; the positive pole of described light-emitting diode is connected with the output of Transformer Rectifier circuit; negative pole is connected with the base stage of described second triode; described light-emitting diode is lighted when described switching circuit conducting, extinguishes when described switching circuit cut-off.
6. the charging circuit of the band short-circuit protection according to claim 4 or 5; it is characterized in that; described sample circuit comprises the second storage capacitor, sampling resistor and divider resistance; described sampling resistor one end ground connection; the other end is connected with the collector electrode of described second triode after connecting with described divider resistance; described sampling resistor is connected with the inverting input of described operational amplifier with the junction of described divider resistance, and described second storage capacitor and described sampling resistor, divider resistance are in parallel.
7. the charging circuit of band short-circuit protection according to claim 1; it is characterized in that; described Transformer Rectifier circuit comprises transformer and rectifier; the primary coil of described transformer is connected with civil power; secondary coil is connected with the input of described rectifier, one end ground connection of the output of described rectifier.
8. the charging circuit of band short-circuit protection according to claim 7, is characterized in that, described charging circuit also comprises isolating diode, and the positive pole of described isolating diode is connected with direct current, and negative pole is connected with the other end of the output of described rectifier.
9. a charger, is characterized in that, comprises the charging circuit of the band short-circuit protection in claim 1 to 8 described in any one.
CN201110142824.9A 2011-05-30 2011-05-30 Charging circuit with short-circuit protection and charger CN102810897B (en)

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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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Application Number Priority Date Filing Date Title
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CN102810897B true CN102810897B (en) 2015-03-11

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104079046B (en) * 2013-03-26 2016-05-11 深圳市海洋王照明工程有限公司 A kind of battery charger
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
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
CN104578277B (en) * 2014-12-24 2016-03-23 广东欧珀移动通信有限公司 For the method for charging for 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
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

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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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