CN104882915A - Lithium battery charging circuit and lamp - Google Patents
Lithium battery charging circuit and lamp Download PDFInfo
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- CN104882915A CN104882915A CN201410071821.4A CN201410071821A CN104882915A CN 104882915 A CN104882915 A CN 104882915A CN 201410071821 A CN201410071821 A CN 201410071821A CN 104882915 A CN104882915 A CN 104882915A
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Abstract
The invention provides a lithium battery charging circuit and a lamp. The lithium battery charging circuit comprises the components of a first adjustable power supply; a first comparator of which the heterophase end is connected with the first adjustable power supply; a controlled switch which comprises a control end, a first switch end and a second switch end, wherein the control end of the controlled switch is connected with the output end of the first comparator; a detecting resistor which is serially arranged between the homophase end of the first comparator and the second switch end of the controlled switch; and a switch module of which the control end is connected with the first switch end of the controlled switch, wherein the input end of the switch module is connected with a charging power supply, and the output end is connected with a lithium battery. The detecting resistor converts a charging current to a sampling voltage. The first comparator compares the value of sampling voltage with the value of a reference voltage and controls the controlled switch. The controlled switch controls the switch module for activating on condition that the electric quantity of the lithium battery is not enough. The lithium battery charging circuit and the lamp can get rid of dependence to a specialized charger and can charge the lithium battery by means of a common power supply. Furthermore high safety and high reliability are realized.
Description
Technical field
The present invention relates to charging circuit, particularly relate to lithium battery charging circuit and light fixture.
Background technology
Existing rechargeable battery charging uses integrated chip to control usually, adopts three stage charging system.Flashlight, the in-built electrical pool light fixtures such as searchlight use the charger with automatic charge control function usually, as long as prevent reverse polarity connection at battery-end series diode, light fixture itself does not have charging detection and control function, has all been come by the charger that outside is supporting the whole charging process of battery.Cause light fixture too to rely on special charger like this, if supporting battery charger failure, use common power can not charge to light fixture, make troubles to use.
Summary of the invention
The technical problem to be solved in the present invention is the deficiency overcoming the existence of above-mentioned prior art, and proposes a kind of lithium battery charging circuit and light fixture, its problem that can solve light fixture charging undue dependence external charger in prior art and bring charging inconvenient.
For solving the problems of the technologies described above, the present invention proposes a kind of lithium battery charging circuit, and it comprises: the first regulated power supply, and it is for providing a reference voltage that can regulate; First comparator, its out-phase end connects the first regulated power supply; Controlled switch, it comprises control end, the first switch terminals and second switch end, and the control end of this controlled switch connects the output of this first comparator; Detect resistance, its string is located between the in-phase end of this first comparator and the second switch end of controlled switch; Switch module, it comprises control end, input and output, and the control end of this switch module connects the first switch terminals of this controlled switch, and the input of this switch module connects charge power supply, and the output of this switch module connects lithium battery; Wherein, this detection resistance is converted to sampled voltage charging current, this first comparator compares this sampled voltage and reference voltage controls this controlled switch, and this controlled switch controls this switch module and opens this charge power supply is charged to this lithium battery under the condition of this lithium battery quantity not sufficient.
Preferably, this lithium battery charging circuit also comprises a current-limiting resistance, and this current-limiting resistance string is located between the output of this first comparator and the control end of controlled switch.
Preferably, this first regulated power supply comprises divider resistance and the first adjustable resistance, and this divider resistance and the first adjustable resistance are connected between a stabilized power source and ground, and the tap terminals of this first adjustable resistance connects the end of oppisite phase of this first comparator.
Preferably, the resistance of this detection resistance is 1 Ω.
Preferably, this switch module comprises the first switching tube, second switch pipe and the first resistance, and this first switching tube and second switch pipe include control end, input and output; The control end of this second switch pipe connects the control end of this switch module, the input of this second switch pipe connects the control end of this second switch pipe, the output of this second switch pipe and the output of this first switching tube are connected, this the first resistance string is located between the input of this first switching tube and the input of second switch pipe, the input of this first switching tube connects the input of this switch module, and the output of this first switching tube connects the output of this switch module.
Preferably, this first switching tube is PNP triode, the base stage of this PNP triode is the control end of this first switching tube, the input of the transmitting of this PNP triode very this first switching tube, the output of the current collection of this PNP triode very this first switching tube, this second switch pipe is NPN triode, the base stage of this NPN triode is the control end of this second switch pipe, the input of the current collection of this NPN triode very this second switch pipe, the output of the transmitting of this NPN triode very this second switch pipe.
Preferably, this lithium battery charging circuit also comprises reminding module, and this reminding module comprises the second regulated power supply, the second comparator, the first sampling resistor, the second sampling resistor, red LED lamp and green LED lamp, this first sampling resistor and the second sampling resistor string are located between the both positive and negative polarity of this lithium battery, the positive terminal of this second comparator connects the junction of this first sampling resistor and the second sampling resistor, the out-phase end of this second comparator connects this second regulated power supply, the output of this second comparator connects this red LED lamp and green LED lamp, this second comparator controls this red LED lamp after comparing the reference voltage of voltage on this second sampling resistor and this second regulated power supply luminous when this lithium battery quantity not sufficient, control the luminescence when being full of of this green LED lamp.
Preferably, this lithium battery charging circuit also comprises power module, and this power module comprises step-down chip, and the input of this step-down chip connects this charge power supply, and this step-down chip exports this stabilized power source.
The present invention also proposes a kind of light fixture, and it comprises lithium battery charging circuit as above.
Compared with prior art, the present invention has following beneficial effect: lithium battery charging circuit of the present invention and light fixture, by using comparator and switch module, can realize controlling the Aulomatizeted Detect of light fixture charging and regulating, too special charger is relied on when avoiding lithium cell charging and in light fixture use procedure, use common voltage source can charge to battery, and it is safe and reliable, in the Portable lighting device of built-in chargeable lithium cell or the occasion of reserve battery charging, there is actual application value.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of lithium battery charging circuit of the present invention.
Description of reference numerals: divider resistance R2 first adjustable resistance RT1 first comparator U1A current-limiting resistance R3 controlled switch Q3 detects resistance RS1 switch module 1 first switching tube Q1 second switch pipe Q2 first resistance R1 reminding module 2 the 8th resistance R8 second adjustable resistance RT2 second comparator U1B first sampling resistor RC1 second sampling resistor RC2 indicating member 21 the 4th resistance R4 the 5th resistance R5 the 6th resistance R6 the 7th resistance R7 the 4th switching tube Q4 the 5th switching tube Q5 red LED lamp D4 green LED lamp D3 power module 3 first filter capacitor C4 second filter capacitor C5 step-down chip U2.
Embodiment
In order to further illustrate principle of the present invention and structure, existing by reference to the accompanying drawings to a preferred embodiment of the present invention will be described in detail.
lithium battery charging circuit embodiment
Refer to Fig. 1, a kind of lithium battery charging circuit, it comprises: the first regulated power supply, the first comparator U1A, controlled switch Q3, detection resistance RS1, current-limiting resistance R3, switch module 1, reminding module 2 and power module 3.
First regulated power supply, it is for providing a reference voltage that can regulate.First comparator U1A, its out-phase end connects the first regulated power supply.Controlled switch Q3, it comprises control end, the first switch terminals and second switch end, and the control end of this controlled switch Q3 connects the output of this first comparator U1A.Detect resistance RS1, its string is located between the in-phase end of this first comparator U1A and the second switch end of controlled switch Q3.This current-limiting resistance R3 string is located between the output of this first comparator U1A and the control end of controlled switch Q3.
Switch module 1, it comprises control end, input and output, and the control end of this switch module 1 connects first switch terminals of this controlled switch Q3, and the input of this switch module 1 connects charge power supply, and the output of this switch module 1 connects lithium battery.
Wherein, this detection resistance RS1 is converted to sampled voltage charging current, this first comparator U1A compares this sampled voltage and reference voltage controls this controlled switch Q3, and this controlled switch Q3 controls this switch module 1 and opens this charge power supply is charged to this lithium battery under the condition of this lithium battery quantity not sufficient.
This first regulated power supply comprises: divider resistance R2 and the first adjustable resistance RT1.This divider resistance R2 and the first adjustable resistance RT1 is connected between a stabilized power source and ground, and the tap terminals of this first adjustable resistance RT1 connects the end of oppisite phase of this first comparator U1A.By regulating the resistance of the first adjustable resistance RT1 can the size of adjusting reference voltage, thus determine the size of charging current.
In the present embodiment, the resistance of this detection resistance RS1 is 1 Ω.The resistance of current-limiting resistance R3 is 100 Ω.
This switch module 1 comprises the first switching tube Q1, second switch pipe Q2 and the first resistance R1, and this first switching tube Q1 and second switch pipe Q2 includes control end, input and output.The control end of this second switch pipe Q2 connects the control end of this switch module 1, the input of this second switch pipe Q2 connects the control end of this second switch pipe Q2, the output of this second switch pipe Q2 and the output of this first switching tube Q1 are connected, this first resistance R1 string is located between the input of this first switching tube Q1 and the input of second switch pipe Q2, the input of this first switching tube Q1 connects the input of this switch module 1, and the output of this first switching tube Q1 connects the output of this switch module 1.
In the present embodiment, this first switching tube Q1 is PNP triode, the base stage of this PNP triode is the control end of this first switching tube Q1, the input of the transmitting of this PNP triode very this first switching tube Q1, the output of the current collection of this PNP triode very this first switching tube Q1.This second switch pipe Q2 is NPN triode, and the base stage of this NPN triode is the control end of this second switch pipe Q2, the input of the current collection of this NPN triode very this second switch pipe Q2, the output of the transmitting of this NPN triode very this second switch pipe Q2.This PNP triode and NPN triode constitute darlington structure, make the control of circuit safer.
This reminding module 2 comprises: the second regulated power supply, the second comparator U1B, the first sampling resistor RC1, the second sampling resistor RC2, red LED lamp D4, green LED lamp D3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 4th switching tube Q4 and the 5th switching tube Q5.
This the first sampling resistor RC1 and the second sampling resistor RC2 string is located between the both positive and negative polarity of this lithium battery, the positive terminal of this second comparator U1B connects the junction of this first sampling resistor RC1 and the second sampling resistor RC2, the out-phase end of this second comparator U1B connects this second regulated power supply, the output of this second comparator U1B connects this red LED lamp D4 and green LED lamp D3, this second comparator U1B controls this red LED lamp D4 after comparing the reference voltage of voltage on this second sampling resistor RC2 and this second regulated power supply luminous when this lithium battery quantity not sufficient, control this green LED lamp D3 luminescence when being full of.4th resistance R4 is connected between the control end of the 4th switching tube Q4 and the output of the second comparator U1B.5th resistance R5 is connected between the input of a stabilized power source and the 4th switching tube Q4.6th resistance R6 and green LED lamp D3 is connected between the input of stabilized power source and the 4th switching tube Q4 successively.The control end of the 5th switching tube Q5 connects the input of the 4th switching tube Q4, and the 7th resistance R7 is connected between the input of stabilized power source and the 5th switching tube Q5.The anode of red LED lamp D4 connects the anode of green LED lamp D3, and the negative electrode of red LED lamp D4 connects the input of the 5th switching tube Q5.
In the present embodiment, the second regulated power supply comprises: the 8th resistance R8 and the second adjustable resistance RT2.8th resistance R8 and the second adjustable resistance RT2 is connected between stabilized power source and ground.Wherein, the tap terminals of the second adjustable resistance RT2 connects the end of oppisite phase of the second comparator U1B, and provides reference voltage to this second comparator U1B by the mode of dividing potential drop.
In the present embodiment, the 4th switching tube Q4 is NPN triode, and the base stage of NPN triode is the control end of the 4th switching tube Q4, the input of the current collection of NPN triode very the 4th switching tube Q4, the output of the transmitting of NPN triode very the 4th switching tube Q4.In other embodiments, NPN triode can replace with metal-oxide-semiconductor.
In the present embodiment, the 5th switching tube Q4 is NPN triode, and the base stage of NPN triode is the control end of the 5th switching tube Q4, the input of the current collection of NPN triode very the 5th switching tube Q4, the output of the transmitting of NPN triode very the 5th switching tube Q4.In other embodiments, NPN triode can replace with metal-oxide-semiconductor.
Power module 3 comprises: the first filter capacitor C4, the second filter capacitor C5 and step-down chip U2.Between the input that this first filter capacitor C4 is connected to step-down chip U2 and ground, between the output that this second filter capacitor C5 is connected to step-down chip U2 and ground, the input of step-down chip U2 is connected through the voltage VV of the charge power supply after rectifying and wave-filtering, and the output of step-down chip U2 exports a stabilized power source VCC.Stabilized power source powers, also for the output of the power supply as the first comparator U1A and the second comparator U1B to the first comparator U1A and the second comparator U1B.
In the present embodiment, the model of the first comparator U1A is LM393, and the resistance of current-limiting resistance R3 is 100 Ω, and the resistance of divider resistance R2 is 100K Ω, and the resistance of the first adjustable resistance RT1 is 10K Ω.The model of the second comparator U1B is LM393, and the resistance of the first sampling resistor RC1 is 4.3K Ω, and the resistance of the second sampling resistor RC2 is 10K Ω.The resistance of the 5th resistance R5 is 1K Ω, and the resistance of the 6th resistance R6 is 500 Ω, and the resistance of the 7th resistance R7 is 1K Ω.The model of step-down chip U2 is 78L05.
Operation principle of the present invention is described in detail below in conjunction with Fig. 1.
It is 14.8V lithium battery charging circuit that the present invention uses the basic electronic components such as the first comparator U1A, the second comparator U1B of wide operating voltage and triode to form rated voltage.Wherein, single-unit lithium ion battery rated voltage 3.7V, charging deboost 4.2V, the present invention is for the lithium ion battery of 4 joint series connection, two diodes and a triode due to cross-over connection between the input of lithium battery charging circuit and battery, input need be greater than 18V.This charger can export the adjustable charging current of 100mA ~ 1A, for individual, 19V power supply on notebook computer can be used as input.Charging interval is determined by the size of current set.
Before charging; first circuit is connected by jumping cap JP1; then the input of lithium battery charging circuit is connected the USB interface of this notebook or the power supply port of other power supply, input voltage after the anti-reverse protection of the fuse F1 of 1.5A, diode D1 to the input of the first switching tube Q1.Default conditions power tube is conducting, because the output of the first comparator U1A exports high level, controlled switch Q3 conducting, the base stage of second switch pipe Q2 is because drag down and conducting.Wherein, detect resistance RS1 and be in current limliting on the only way which must be passed that charged electrical flows back to ground.Voltage on first comparator U1A computing acquisition testing resistance RS1 and the output current from output voltage control switch module after the centre tapped voltage compare of the first adjustable resistance RT1, and all the time in a fixed current value.Regulate the first adjustable resistance RT1 can regulate this charging current.
Second comparator U1B samples to lithium battery voltage, when battery does not access, the 17.5v voltage exported is by exporting to the 4th switching tube Q4 after the center tap voltage of the magnitude of voltage after the first sampling resistor RC1, the second sampling resistor RC2 dividing potential drop and the second adjustable resistance RT2, and now green LED lamp D3 brightens.Access this charging circuit when dead battery after, the center tap voltage of the voltage step-down that the second sampling resistor RC2 samples and the second adjustable resistance RT2 relatively after, the second comparator U1B controls red LED lamp D4 and brightens.After being full of electricity, when the voltage that the second sampling resistor RC2 samples is greater than reference voltage (center tap voltage of the second adjustable resistance RT2), red LED lamp D4 brightens, prompting charging complete.But circuit still can carry out trickle charge with the charging modes of small area analysis to battery.
light fixture embodiment
The present invention also proposes a kind of light fixture, and it comprises the lithium battery charging circuit be as above somebody's turn to do.
Compared with prior art, the present invention has following beneficial effect: lithium battery charging circuit of the present invention and light fixture, by using comparator and switch module, can realize controlling the Aulomatizeted Detect of light fixture charging and regulating, too special charger is relied on when avoiding lithium cell charging and in light fixture use procedure, use common voltage source can charge to battery, and it is safe and reliable, in the Portable lighting device of built-in chargeable lithium cell or the occasion of reserve battery charging, there is actual application value.
These are only better possible embodiments of the present invention, not limit the scope of the invention, all utilizations specification of the present invention and the change of the equivalent structure done by accompanying drawing content, be all included in protection scope of the present invention.
Claims (9)
1. a lithium battery charging circuit, is characterized in that, it comprises:
First regulated power supply, it is for providing a reference voltage that can regulate;
First comparator, its out-phase end connects the first regulated power supply;
Controlled switch, it comprises control end, the first switch terminals and second switch end, and the control end of this controlled switch connects the output of this first comparator;
Detect resistance, its string is located between the in-phase end of this first comparator and the second switch end of controlled switch;
Switch module, it comprises control end, input and output, and the control end of this switch module connects the first switch terminals of this controlled switch, and the input of this switch module connects charge power supply, and the output of this switch module connects lithium battery;
Wherein, this detection resistance is converted to sampled voltage charging current, this first comparator compares this sampled voltage and reference voltage controls this controlled switch, and this controlled switch controls this switch module and opens this charge power supply is charged to this lithium battery under the condition of this lithium battery quantity not sufficient.
2. lithium battery charging circuit as claimed in claim 1, it is characterized in that, this lithium battery charging circuit also comprises a current-limiting resistance, and this current-limiting resistance string is located between the output of this first comparator and the control end of controlled switch.
3. lithium battery charging circuit as claimed in claim 1, it is characterized in that, this first regulated power supply comprises divider resistance and the first adjustable resistance, this divider resistance and the first adjustable resistance are connected between a stabilized power source and ground, and the tap terminals of this first adjustable resistance connects the end of oppisite phase of this first comparator.
4. lithium battery charging circuit as claimed in claim 1, it is characterized in that, the resistance of this detection resistance is 1 Ω.
5. lithium battery charging circuit as claimed in claim 1, it is characterized in that, this switch module comprises the first switching tube, second switch pipe and the first resistance, and this first switching tube and second switch pipe include control end, input and output; The control end of this second switch pipe connects the control end of this switch module, the input of this second switch pipe connects the control end of this second switch pipe, the output of this second switch pipe and the output of this first switching tube are connected, this the first resistance string is located between the input of this first switching tube and the input of second switch pipe, the input of this first switching tube connects the input of this switch module, and the output of this first switching tube connects the output of this switch module.
6. as lithium battery charging circuit that claim 5 is somebody's turn to do, it is characterized in that, this first switching tube is PNP triode, the base stage of this PNP triode is the control end of this first switching tube, the input of the transmitting of this PNP triode very this first switching tube, the output of the current collection of this PNP triode very this first switching tube, this second switch pipe is NPN triode, the base stage of this NPN triode is the control end of this second switch pipe, the input of the current collection of this NPN triode very this second switch pipe, the output of the transmitting of this NPN triode very this second switch pipe.
7. as lithium battery charging circuit that claim 1 is somebody's turn to do, it is characterized in that, this lithium battery charging circuit also comprises reminding module, and this reminding module comprises the second regulated power supply, the second comparator, the first sampling resistor, the second sampling resistor, red LED lamp and green LED lamp, this first sampling resistor and the second sampling resistor string are located between the both positive and negative polarity of this lithium battery, the positive terminal of this second comparator connects the junction of this first sampling resistor and the second sampling resistor, the out-phase end of this second comparator connects this second regulated power supply, the output of this second comparator connects this red LED lamp and green LED lamp, this second comparator controls this red LED lamp after comparing the reference voltage of voltage on this second sampling resistor and this second regulated power supply luminous when this lithium battery quantity not sufficient, control the luminescence when being full of of this green LED lamp.
8. as the lithium battery charging circuit that claim 1 is somebody's turn to do, it is characterized in that, this lithium battery charging circuit also comprises power module, and this power module comprises step-down chip, and the input of this step-down chip connects this charge power supply, and this step-down chip exports this stabilized power source.
9. a light fixture, is characterized in that, it comprises the lithium battery charging circuit be somebody's turn to do as claim 1 to 8 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410071821.4A CN104882915B (en) | 2014-02-28 | 2014-02-28 | Lithium battery charging circuit and lamps and lanterns |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410071821.4A CN104882915B (en) | 2014-02-28 | 2014-02-28 | Lithium battery charging circuit and lamps and lanterns |
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| Publication Number | Publication Date |
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| CN104882915A true CN104882915A (en) | 2015-09-02 |
| CN104882915B CN104882915B (en) | 2019-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410071821.4A Active CN104882915B (en) | 2014-02-28 | 2014-02-28 | Lithium battery charging circuit and lamps and lanterns |
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| CN110209233A (en) * | 2019-06-03 | 2019-09-06 | 长沙优力电驱动系统有限公司 | Power module |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN104882915B (en) | 2019-07-02 |
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