CN103368243A - Current limiting charging circuit - Google Patents
Current limiting charging circuit Download PDFInfo
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- CN103368243A CN103368243A CN2012100873259A CN201210087325A CN103368243A CN 103368243 A CN103368243 A CN 103368243A CN 2012100873259 A CN2012100873259 A CN 2012100873259A CN 201210087325 A CN201210087325 A CN 201210087325A CN 103368243 A CN103368243 A CN 103368243A
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Abstract
The embodiment of the invention discloses a current limiting charging circuit comprising a transformer, an oscillation switch and a current limiting module. The current limiting module comprises a current limiting resistor and a current limiting switch. A primary coil of the transformer, the oscillation switch and the current limiting resistor are in series connection in order and then are connected between an anode of a power supply and the ground. A control end of the oscillation switch is communicated with pulse voltage. The current limiting switch is connected between the control end of the oscillation switch and the ground. A control end of the current limiting switch is connected with a common node of the current limiting resistor and the oscillation switch. By employing the current limiting charging circuit, the current of the charging circuit can be effectively limited, the burning of a component due to overcurrent is prevented, and the service life of the charging circuit is prolonged.
Description
Technical field
The present invention relates to the charging circuit of battery, relate in particular to a kind of current-limiting charging circuit.
Background technology
Traditional charger when circuit abnormality causes electric current excessive, is easy to damage charging circuit because charging the time does not have perfect overcurrent protection function.
Summary of the invention
Embodiment of the invention technical problem to be solved is, a kind of current-limiting charging circuit is provided.Can limit the electric current of charging circuit, prolong the useful life of charger.
In order to solve the problems of the technologies described above, the embodiment of the invention provides a kind of current-limiting charging circuit, comprise transformer, oscillation switch and current limliting module, described current limliting module comprises current-limiting resistance and current limiting switch, after connecting successively, the primary coil of described transformer, oscillation switch and current-limiting resistance be connected between positive source and the ground, the control end of described oscillation switch is communicated with pulse voltage, described current limiting switch is connected between the control end and ground of described oscillation switch, and the control end of described current limiting switch is connected to the common node of described current-limiting resistance and described oscillation switch; When the control end voltage of described oscillation switch is lower than the first predetermined threshold value, described oscillation switch disconnects, when the control end voltage of described oscillation switch is not less than described the first predetermined threshold value, described oscillation switch conducting, and the electric current of described oscillation switch reduces along with the reduction of its control end voltage when conducting; When the control end voltage of described current limiting switch is lower than the second predetermined threshold value, described current limiting switch disconnects, when the control end voltage of described current limiting switch was not less than described the second predetermined threshold value, described current limiting switch conducting dragged down the control end voltage of described oscillation switch.
Wherein, described current-limiting charging circuit also comprises rectification filtering module, two inputs of described rectification filtering module and city's electric connection, and described positive source is the positive output end of described rectification filtering module.
Wherein, described current limliting module also comprises Current Limiting Diodes, and the positive pole of described Current Limiting Diodes links to each other with the common node of described oscillation switch and described current-limiting resistance, and the negative pole of described Current Limiting Diodes is communicated with the control end of described current limiting switch.
Wherein, described oscillation switch is NPN pipe, and the control end of described oscillation switch is the base stage of a NPN pipe, and the collector electrode of a described NPN pipe is connected with the primary coil of transformer, and the emitter of a described NPN pipe is connected with current-limiting resistance.
Wherein, described current limiting switch is the 2nd NPN pipe, and the control end of described current limiting switch is the base stage of the 2nd NPN pipe, and the collector electrode of described the 2nd NPN pipe is connected with the control end of oscillation switch, and the emitter of described the 2nd NPN pipe is communicated with ground.
Wherein, described rectification filtering module comprises rectifier diode and the filter capacitor that is connected in series, the negative pole of described rectifier diode is connected with described filter capacitor, and the common node of described rectifier diode and described filter capacitor is the positive output end of described rectification filtering module.
Wherein, the control end of described oscillation switch is communicated with described positive source via starting resistance.
Wherein, described current-limiting charging circuit also comprises for the high pressure absorption module that absorbs the induced voltage on the transformer, described high pressure absorption module comprises high pressure absorption diode, high pressure absorption resistance and high pressure Absorption Capacitance, be connected in series between the primary coil two ends of transformer with the high pressure absorption diode after described high pressure absorption resistance and the parallel connection of high pressure Absorption Capacitance, the negative pole of described high pressure absorption diode is communicated with described positive source via the high pressure absorption resistance.
Wherein, described current-limiting charging circuit also comprises overcurrent protection resistance, and described rectification filtering module and described overcurrent protection resistance are connected in series between the civil power two ends, and described overcurrent protection resistance blows when electric current surpasses the 3rd predetermined threshold value.
Wherein, described current-limiting charging circuit also comprises the positive feedback module, described positive feedback module comprises sample coil, positive feedback electric capacity and positive feedback resistor, described starting resistance, positive feedback resistor, positive feedback electric capacity and sample coil are connected in series between described positive source and the ground successively, described starting resistance be connected the common node of positive feedback resistor and be connected with the control end of described oscillation switch, and the secondary coil electromagnetic coupled of described sample coil and described transformer.
Implement the embodiment of the invention, has following beneficial effect: circuital current is taken a sample by current-limiting resistance, then feed back to the control end of oscillation switch by current limiting switch, when overcurrent, reduce oscillation switch control end voltage, thereby reduce to flow through the electric current of transformer and oscillation switch, can effectively limit the electric current of charging circuit, prevent from having prolonged the useful life of charging circuit because overcurrent burns components and parts.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is a structural representation of the preferred embodiment of current-limiting charging circuit provided by the invention;
Fig. 2 is another structural representation of the preferred embodiment of current-limiting charging circuit provided by the invention;
Fig. 3 is the another structural representation of the preferred embodiment of current-limiting charging circuit provided by the invention;
Fig. 4 is the circuit diagram of the preferred embodiment of current-limiting charging circuit provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Seeing also Fig. 1, is a structural representation of the preferred embodiment of current-limiting charging circuit provided by the invention.This current-limiting charging circuit comprises transformer 110, oscillation switch 120 and current limliting module 130, and current limliting module 130 comprises current-limiting resistance 131 and current limiting switch 132, and transformer 110 comprises primary coil 111 and secondary coil 112.The secondary coil 112 of transformer is connected between two outputs of current-limiting charging circuit.At input side, primary coil 111, oscillation switch 120 and current-limiting resistance 131 are connected between positive source and the ground after connecting successively, the control end of oscillation switch 120 is communicated with pulse voltage, current limiting switch 132 is connected between the control end and ground of oscillation switch 120, and the control end of current limiting switch 132 is connected to the common node of current-limiting resistance 131 and oscillation switch 120.When the control end voltage of oscillation switch 120 is lower than the first predetermined threshold value, oscillation switch 120 disconnects, when the control end voltage of oscillation switch 120 is not less than the first predetermined threshold value, oscillation switch 120 conductings, and the electric current of oscillation switch 120 reduces along with the reduction of its control end voltage when conducting.When the control end voltage of current limiting switch 132 was lower than the second predetermined threshold value, current limiting switch 132 disconnected, and when the control end voltage of current limiting switch 132 was not less than the second predetermined threshold value, current limiting switch 132 conductings dragged down the control end voltage of oscillation switch 120.
In the course of work of current-limiting charging circuit shown in Figure 1, when being greater than or equal to the first predetermined threshold value under the effect of control end voltage in pulse voltage of oscillation switch 120, oscillation switch 120 conductings, primary coil 111 energisings; When being lower than the first predetermined threshold value under the effect of control end voltage in pulse voltage of oscillation switch 120, oscillation switch 120 disconnects, primary coil 111 outages.Because the periodic voltage of pulse voltage changes, the power on/off at primary coil 111 intervals, thus form magnetic field, make in the secondary coil 112 and produce induced voltage, export to rechargeable battery.When the electric current in the elementary coil 111 is excessive, voltage on the current-limiting resistance 131 increases, make the control end voltage of current limiting switch 132 be greater than or equal to the second predetermined threshold value, at this moment current limiting switch 132 conductings, drag down the control end voltage of oscillation switch 120, reduce so that flow through the electric current of oscillation switch 120, thereby reduced electric current in the primary coil 111.
The current-limiting charging circuit that the embodiment of the invention provides, by current-limiting resistance circuital current is taken a sample, then feed back to the control end of oscillation switch by current limiting switch, when overcurrent, reduce oscillation switch control end voltage, thereby reduce to flow through the electric current of transformer and oscillation switch, can effectively limit the electric current of charging circuit, prevent from having prolonged the useful life of charging circuit because overcurrent burns components and parts.
Seeing also Fig. 2, is another structural representation of the preferred embodiment of current-limiting charging circuit provided by the invention.Except transformer shown in Figure 1 110, oscillation switch 120 and current limliting module 130, this current-limiting charging circuit also comprises rectification filtering module 140.Two inputs of rectification filtering module 140 and city's electric connection, positive source is the positive output end of rectification filtering module 140.Rectification filtering module 140 can be converted to low-voltage direct with civil power, in order to be the components and parts power supply of input side.
Preferably, as shown in Figure 4, rectification filtering module 140 comprises rectifier diode D1 and the filter capacitor C1 that is connected in series, and the negative pole of rectifier diode D1 is connected with filter capacitor C1, and the common node of rectifier diode D1 and filter capacitor C1 is the positive output end of rectification filtering module 140.
Preferably, as shown in Figure 4, current-limiting charging circuit also comprises overcurrent protection resistance R 1, and rectification filtering module 140 and overcurrent protection resistance R 1 are connected in series between the civil power two ends, and overcurrent protection resistance R 1 is blown when electric current surpasses the 3rd predetermined threshold value.That is to say, when because fault etc. when causing overcurrent, overcurrent protection resistance R 1 will be blown, thereby avoid causing larger fault.
Seeing also Fig. 3, is the another structural representation of the preferred embodiment of current-limiting charging circuit provided by the invention.Except transformer shown in Figure 2 110, oscillation switch 120, current limliting module 130 and rectification filtering module 140, this current-limiting charging circuit also comprises high pressure absorption module 150, when oscillation switch 120 disconnects, high pressure absorption module 150 can be used for absorb the induced voltage on the transformer, causes puncturing to prevent high pressure to be added on the oscillation switch 120.
Preferably, as shown in Figure 4, high pressure absorption module 150 comprises high pressure absorption diode D2, high pressure absorption resistance R3 and high pressure Absorption Capacitance C2.Be connected in series between primary coil 111 two ends of transformer with high pressure absorption diode D2 after high pressure absorption resistance R3 and the high pressure Absorption Capacitance C2 parallel connection, the negative pole of high pressure absorption diode D2 is communicated with positive source (positive output end of the rectification filtering module 140 in embodiment illustrated in fig. 2) via high pressure absorption resistance R3.
In addition, as shown in Figure 3, current-limiting charging circuit can also comprise positive feedback module 160, positive feedback module 160 is connected between the control end of transformer 110 and oscillation switch 120, be used for the oscillating voltage of sensor transformer 110, and oscillating voltage be loaded on the control end of oscillation switch 120, intermittent disconnects, the state of passage so that control oscillation switch 120 keeps, thereby keep vibration, make the charging circuit can continuous firing.
Preferably, as shown in Figure 4, positive feedback module 160 can comprise sample coil 4.3, positive feedback capacitor C 3 and positive feedback resistor R5, positive feedback resistor R5, positive feedback capacitor C 3 and sample coil 4.5 are connected in series between the base stage (control end of oscillation switch 120) and ground of Q1 successively, and secondary coil 10.6 electromagnetic coupled of sample coil 4.5 and transformer TR1.
Preferably, in any embodiment shown in Fig. 1-3, oscillation switch 120 is NPN pipes, and the control end of oscillation switch 120 is base stages of a NPN pipe.As shown in Figure 4, the collector electrode of NPN pipe Q1 is connected with the primary coil 1.3 of transformer TR1, and the emitter of NPN pipe Q1 is connected with current-limiting resistance R4.
Preferably, in any embodiment shown in Fig. 1-3, current limiting switch 132 is the 2nd NPN pipes, and the control end of current limiting switch 132 is base stages of the 2nd NPN pipe.As shown in Figure 4, the collector electrode of the 2nd NPN pipe Q2 and NPN pipe Q1(oscillation switch 120) control end be connected, the emitter that the 2nd NPN manages Q2 is communicated with ground.
Preferably, in any embodiment shown in Fig. 1-3, current limliting module 130 can also comprise Current Limiting Diodes.As shown in Figure 4, the positive pole of Current Limiting Diodes D3 and NPN pipe Q1(oscillation switch 120) link to each other with the common node of current-limiting resistance R4, the negative pole of Current Limiting Diodes D3 and the 2nd NPN manage Q2(current limiting switch 132) base stage be communicated with.
Preferably, in any embodiment shown in Fig. 1-3, the control end of oscillation switch is communicated with positive source via starting resistance, thereby provides pulse voltage for the control end of oscillation switch.As shown in Figure 4, starting resistance R2 is connected between the positive output end of the base stage of NPN pipe Q1 and rectification filtering module.
Seeing also Fig. 4, is the circuit diagram of the preferred embodiment of current-limiting charging circuit provided by the invention.As shown in Figure 4, the input of charging circuit receives the input of 220V civil power, and an end is through the D1 halfwave rectifier, and the other end is through behind the R1, by C1 filtering.R1 is for the protection of circuit, if late-class circuit breaks down etc. and to cause overcurrent, this resistance will be blown so, thereby avoid causing larger fault.R3, C2, D2 consist of a high pressure absorbing circuit, when NPN manages the Q1 shutoff, are responsible for absorbing the induced voltage on the primary coil 1.3, thereby prevent that high pressure is added to NPN pipe Q1 and upward causes puncture.NPN pipe Q1 is used for controlling the switching between primary coil 1.3 and the power supply.When elementary coil 1.3 ceaselessly during break-make, will be in transformer the magnetic field of formation and modification, thereby in secondary coil 10.6, produce induced voltage.R2 is starting resistance, and Q1 provides the base voltage that starts usefulness to the NPN pipe.R4 is sample resistance, and the electric current in the primary coil branch road becomes voltage after the R4 sampling, and this voltage adds on the Q2 base stage behind diode D3.When sampling voltage approximately greater than 1.4V, when namely the NPN tube current is greater than 0.14A, NPN pipe Q2 conducting, thereby the base voltage of NPN being managed Q1 drags down, thereby collector current reduces, and has so just limited the electric current in the circuit, prevent that electric current is excessive and burn, realize current-limiting function.And the C3 electric capacity of the R5 resistance of below and series connection with it then is positive feedback branch, takes out induced voltage from sample coil, is added on the base stage of NPN pipe Q1, to keep vibration.Voltage output voltage behind diode D5 rectification and C5 capacitor filtering of the secondary coil on the right charges the battery.
Particularly, can give a lithium cell charging with circuit shown in Figure 4, wherein, it is that 4148, D5 is 1N5816 that D1 and D2 are 4007, D3.Q1 is the withstand voltage 400V of 13003, Q1, maximum collector currnt 1.5V, and the maximum collector power consumption is 14W, Q2 is C945.R1=10 Europe, R3=82k Europe, R2=510k Europe, R4=10 Europe, R5=1k Europe, C1=10uF, C2=4700pF, C3=2700pF, C5=220uF.
Above disclosed only is a kind of preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention, one of ordinary skill in the art will appreciate that all or part of flow process that realizes above-described embodiment, and according to the equivalent variations that claim of the present invention is done, still belong to the scope that invention is contained.
Claims (10)
1. current-limiting charging circuit, it is characterized in that, comprise transformer, oscillation switch and current limliting module, described current limliting module comprises current-limiting resistance and current limiting switch, after connecting successively, the primary coil of described transformer, oscillation switch and current-limiting resistance be connected between positive source and the ground, the control end of described oscillation switch is communicated with pulse voltage, described current limiting switch is connected between the control end and ground of described oscillation switch, and the control end of described current limiting switch is connected to the common node of described current-limiting resistance and described oscillation switch; When the control end voltage of described oscillation switch is lower than the first predetermined threshold value, described oscillation switch disconnects, when the control end voltage of described oscillation switch is not less than described the first predetermined threshold value, described oscillation switch conducting, and the electric current of described oscillation switch reduces along with the reduction of its control end voltage when conducting; When the control end voltage of described current limiting switch is lower than the second predetermined threshold value, described current limiting switch disconnects, when the control end voltage of described current limiting switch was not less than described the second predetermined threshold value, described current limiting switch conducting dragged down the control end voltage of described oscillation switch.
2. current-limiting charging circuit according to claim 1, it is characterized in that, described current-limiting charging circuit also comprises rectification filtering module, two inputs of described rectification filtering module and city's electric connection, and described positive source is the positive output end of described rectification filtering module.
3. current-limiting charging circuit according to claim 2; it is characterized in that; described current-limiting charging circuit also comprises overcurrent protection resistance; described rectification filtering module and described overcurrent protection resistance are connected in series between the civil power two ends, and described overcurrent protection resistance blows when electric current surpasses the 3rd predetermined threshold value.
4. current-limiting charging circuit according to claim 1, it is characterized in that, described current limliting module also comprises Current Limiting Diodes, the positive pole of described Current Limiting Diodes links to each other with the common node of described oscillation switch and described current-limiting resistance, and the negative pole of described Current Limiting Diodes is communicated with the control end of described current limiting switch.
5. current-limiting charging circuit according to claim 1, it is characterized in that, described oscillation switch is NPN pipe, the control end of described oscillation switch is the base stage of a NPN pipe, the collector electrode of a described NPN pipe is connected with the primary coil of transformer, and the emitter of a described NPN pipe is connected with current-limiting resistance.
6. current-limiting charging circuit according to claim 1, it is characterized in that, described current limiting switch is the 2nd NPN pipe, the control end of described current limiting switch is the base stage of the 2nd NPN pipe, the collector electrode of described the 2nd NPN pipe is connected with the control end of oscillation switch, and the emitter of described the 2nd NPN pipe is communicated with ground.
7. current-limiting charging circuit according to claim 1, it is characterized in that, described rectification filtering module comprises rectifier diode and the filter capacitor that is connected in series, the negative pole of described rectifier diode is connected with described filter capacitor, and the common node of described rectifier diode and described filter capacitor is the positive output end of described rectification filtering module.
8. current-limiting charging circuit according to claim 1 or 5 is characterized in that, the control end of described oscillation switch is communicated with described positive source via starting resistance.
9. current-limiting charging circuit according to claim 8, it is characterized in that, described current-limiting charging circuit also comprises the positive feedback module, described positive feedback module comprises sample coil, positive feedback electric capacity and positive feedback resistor, described starting resistance, positive feedback resistor, positive feedback electric capacity and sample coil are connected in series between described positive source and the ground successively, described starting resistance be connected the common node of positive feedback resistor and be connected with the control end of described oscillation switch, and the secondary coil electromagnetic coupled of described sample coil and described transformer.
10. current-limiting charging circuit according to claim 1, it is characterized in that, described current-limiting charging circuit also comprises for the high pressure absorption module that absorbs the induced voltage on the transformer, described high pressure absorption module comprises high pressure absorption diode, high pressure absorption resistance and high pressure Absorption Capacitance, be connected in series between the primary coil two ends of transformer with the high pressure absorption diode after described high pressure absorption resistance and the parallel connection of high pressure Absorption Capacitance, the negative pole of described high pressure absorption diode is communicated with described positive source via the high pressure absorption resistance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100873259A CN103368243A (en) | 2012-03-29 | 2012-03-29 | Current limiting charging circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100873259A CN103368243A (en) | 2012-03-29 | 2012-03-29 | Current limiting charging circuit |
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| CN103368243A true CN103368243A (en) | 2013-10-23 |
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| CN2012100873259A Pending CN103368243A (en) | 2012-03-29 | 2012-03-29 | Current limiting charging circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103928958A (en) * | 2014-04-08 | 2014-07-16 | 深圳桑达国际电源科技有限公司 | Lithium battery charging or discharging management circuit and lithium battery management system |
| CN106572703A (en) * | 2015-04-30 | 2017-04-19 | 惠州市吉瑞科技有限公司 | Electronic cigarette and temperature control method for heating element thereof |
| CN110880736A (en) * | 2019-11-14 | 2020-03-13 | 天津航空机电有限公司 | Current-limiting protection circuit based on double-triode positive feedback |
| CN113541606A (en) * | 2020-04-20 | 2021-10-22 | 华邦电子股份有限公司 | Oscillation circuit and semiconductor integrated circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201116683Y (en) * | 2007-11-14 | 2008-09-17 | 柯建锋 | Emergency light |
| US20110266998A1 (en) * | 2009-01-21 | 2011-11-03 | Actions Semiconductor Co. Ltd. | Battery Charging Method and Device |
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2012
- 2012-03-29 CN CN2012100873259A patent/CN103368243A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201116683Y (en) * | 2007-11-14 | 2008-09-17 | 柯建锋 | Emergency light |
| US20110266998A1 (en) * | 2009-01-21 | 2011-11-03 | Actions Semiconductor Co. Ltd. | Battery Charging Method and Device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103928958A (en) * | 2014-04-08 | 2014-07-16 | 深圳桑达国际电源科技有限公司 | Lithium battery charging or discharging management circuit and lithium battery management system |
| CN103928958B (en) * | 2014-04-08 | 2016-02-03 | 深圳桑达国际电源科技有限公司 | A kind of charging and discharging lithium battery management circuit and lithium battery management system |
| CN106572703A (en) * | 2015-04-30 | 2017-04-19 | 惠州市吉瑞科技有限公司 | Electronic cigarette and temperature control method for heating element thereof |
| CN106572703B (en) * | 2015-04-30 | 2019-06-28 | 惠州市吉瑞科技有限公司 | A kind of electronic cigarette and its heat generating member temprature control method |
| CN110880736A (en) * | 2019-11-14 | 2020-03-13 | 天津航空机电有限公司 | Current-limiting protection circuit based on double-triode positive feedback |
| CN113541606A (en) * | 2020-04-20 | 2021-10-22 | 华邦电子股份有限公司 | Oscillation circuit and semiconductor integrated circuit |
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Application publication date: 20131023 |