CN103457320A - Lithium ion battery switch charging circuit - Google Patents
Lithium ion battery switch charging circuit Download PDFInfo
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- CN103457320A CN103457320A CN2013103695370A CN201310369537A CN103457320A CN 103457320 A CN103457320 A CN 103457320A CN 2013103695370 A CN2013103695370 A CN 2013103695370A CN 201310369537 A CN201310369537 A CN 201310369537A CN 103457320 A CN103457320 A CN 103457320A
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Abstract
The invention relates to an electronic circuit technology, in particular to a lithium ion battery switch charging circuit which comprises a switch network, an inductor L, a charging current sampling circuit, a charging current arranging circuit, a charging current sampling signal amplifying circuit, a battery voltage sampling circuit, a battery voltage sampling signal amplifying circuit, a converting resistor, a first buffer, a second buffer, a compensation network, a PWM comparer and a logic control circuit. The input end of the switch network is connected with a power supply, the output end of the switch network is connected with one end of the inductor L, the other end of the inductor L is connected with the input end of the charging current sampling circuit, the output end of the charging current sampling circuit is connected with the input end of the battery voltage sampling circuit, and the output end of the battery voltage sampling circuit is connected with a positive electrode of a lithium ion battery. The lithium ion battery switch charging circuit has the advantages that efficiency and reliability are high, smooth switching from a constant current charging mode to a constant voltage charging mode can be achieved without a complex control structure or a BCD technology, and the lithium ion battery switch charging circuit is good.
Description
Technical field
The present invention relates to electronic circuit technology, relate to specifically a kind of lithium ion battery switched charge circuit based on the constant current/constant voltage mode.
Background technology
Nowadays, all kinds of portable products have obtained universal greatly, as notebook computer, mobile phone, video camera, personal digital assistant device etc.Simultaneously, these portable products have also proposed the requirement of many uniquenesses to battery: energy density is high, can be for portable use provides sufficient energy, lightweight, volume is little, safe enough and can tackle possible incorrect use, service life cycle is long, the idle state self discharge is little, cost is low etc.Lithium ion battery is little with its volume, energy density is high, without memory, cycle life is high, high cell voltage and the advantage such as self-discharge rate is low, has become in recent years the first-selected battery of hand-held terminal device.
The charging method of lithium ion battery mainly contains four kinds at present: constant current charge, constant voltage charge, constant current/constant voltage charging and pulse current charge.The constant current/constant voltage charging modes is short with its time, and the characteristics that charge efficiency is high are adopted by most of lithium ion charging circuits.The constant current/constant voltage charging modes is at first from constant current, if the lithium ion battery overdischarge is first from trickle.In the constant current charge process, in order to prevent overcharging, need monitor battery terminal voltage always.When battery terminal voltage reaches float charge voltage, circuit switches to the constant voltage charge pattern, until charging current drops to set point or voltage while surpassing set point, charging process finishes, and battery electric quantity is full of.Adopt at present the charging circuit of constant current/constant voltage charging modes to mainly contain linear-charging circuit and switched charge circuit.The linear-charging circuit structure is comparatively simple, and cost is low, larger but its disadvantage is power consumption.The switched charge circuit is due to itself high efficiency characteristic, and circuit all keeps less power consumption in very wide AC adapter input voltage range and whole battery terminal voltage scope.Therefore, high efficiency characteristics will make the switched charge circuit become the development trend of lithium ion cell charging circuit.
At present, lithium ion switched charge circuit based on the constant current/constant voltage mode adopts BCD technique more, and the diode or the bipolar transistor that by charging current sampled signal amplifying circuit, with battery voltage sampling signal amplification circuit output, are connected are realized the switching of constant current charging mode to the constant voltage charge pattern.The present invention, by standard CMOS process, realizes the lithium ion battery switched charge circuit that the constant current/constant voltage mode is charged.Simultaneously, the lithium ion switched charge circuit that adopts standard CMOS process compared to other, structure of the present invention is comparatively simple.By adopting charging current sampled signal amplifying circuit shown in the present and battery voltage sampling signal amplification circuit, and the outer metal-oxide-semiconductor that is connected into the diode form of battery voltage sampling signal amplification circuit is realized the switching of constant current charging mode to the constant voltage charge pattern.
Summary of the invention
Technical problem to be solved by this invention, be exactly in conjunction with the high efficiency characteristics of switched charge circuit, provides a kind of based on the constant current/constant voltage charging modes, the lithium ion battery switched charge circuit of realizing under standard CMOS process.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of lithium ion battery switched charge circuit comprises that switching network, inductance L, charging current sample circuit, charging current arrange circuit, charging current sampled signal amplifying circuit, battery voltage sampling circuit, battery voltage sampling signal amplification circuit, transfer resistance, the first buffer, the second buffer, compensating network, PWM comparator and logic control circuit; Wherein, the input termination power of switching network, output connect an end of inductance L, the input of another termination charging current sample circuit of inductance L; The output of charging current sample circuit connects the input of battery voltage sampling circuit, and the output of battery voltage sampling circuit connects the positive pole of lithium ion battery;
The charging current sample circuit comprises sampling resistor Rsns, and the voltage at sampling resistor Rsns two ends is sampled, output high potential sampling end and electronegative potential sampling end, described high potential sampling end is connected with the input that charging current arranges circuit, the electronegative potential sampling end is connected with the negative input end of charging current sampled signal amplifying circuit, and the output that charging current arranges circuit is connected with the positive input terminal of charging current sampled signal amplifying circuit;
Charging current sampled signal amplifying circuit consists of operational transconductance amplifier, the two-way branch current size of output is ratio, the difference that the size of current of the first output branch road is high potential sampling end and electronegative potential sampling end, the K that the size of current of the second output branch road is high potential sampling end and electronegative potential sampling end difference doubly gains, and described K is constant;
Battery voltage sampling circuit comprises the first resistance R 1 and the second resistance R 2, one end of the first resistance R 1 is connected with the positive pole of charging current sample circuit and lithium ion battery, the other end is connected with an end of the second resistance R 2, the other end ground connection of the second resistance R 2, the high potential signal sampling of battery voltage sampling circuit to the second resistance R 2 one ends, the voltage sampling signal of output;
The battery voltage sampling signal amplification circuit consists of operational transconductance amplifier, and first input end is connected with the second output branch road of charging current sampled signal amplifying circuit, the second input is connected with reference voltage, the 3rd input is connected with voltage sampling signal;
The output of battery voltage sampling signal amplification circuit is exported after branch road is connected and is connected to an end of transfer resistance and the positive input terminal of the first buffer by switching tube and first of charging current sampled signal amplifying circuit, after being connected with output, the negative input end of the first buffer is connected with the negative input end of compensating network, the positive input terminal of the negative input end of the other end of transfer resistance and the second buffer, the output of the second buffer and compensating network is connected, and the positive input terminal of the second buffer connects reference voltage;
The output of compensating network is connected with the positive input terminal of PWM comparator, and the negative input termination sawtooth waveforms of PWM comparator, output connect the input of logic control circuit, and the output of logic control circuit is connected with switching network.
Concrete, described switching network comprises PMOS pipe and NMOS pipe, the source electrode of PMOS pipe connects after power supply, drain electrode are connected with the drain electrode of NMOS pipe and is connected with an end of inductance L, the grid of the grid of PMOS pipe and NMOS pipe connects respectively the two path control signal of logic control circuit output, the source ground of NMOS pipe.
Concrete, described charging current arranges circuit and comprises the 3rd resistance R 3, the 4th resistance R 4 and current source; The output that the hot end of described the 3rd resistance R 3 is connected with the hot end of sampling resistor Rsns, electronegative potential and an end of the 4th resistance R 4 are connected and arrange as charging current circuit, the other end of the 4th resistance R 4 connects the positive pole of current source, the minus earth of current source; Described the 3rd resistance R 3 is adjustable resistance, can realize by chip internal trimming resistance or outside adjustable resistance.
Beneficial effect of the present invention is, has higher efficiency and reliability, do not need complicated control structure or BCD technique just to realize constant current charging mode taking over seamlessly to the constant voltage charge pattern.
The accompanying drawing explanation
Fig. 1 is system principle schematic diagram of the present invention;
Fig. 2 is the structural representation that charging current arranges circuit;
Fig. 3 is the signal principle schematic of charging current sampled signal amplifying circuit;
Fig. 4 is the signal principle schematic of battery voltage sampling signal amplification circuit.
Embodiment
Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail:
As shown in Figure 1, the present invention includes switching network, inductance L, charging current sample circuit, charging current circuit, charging current sampled signal amplifying circuit, battery voltage sampling circuit, battery voltage sampling signal amplification circuit G, I-V transfer resistance, the first buffer 1, the second buffer 2, compensating network, PWM comparator, logic control circuit are set.Input voltage is after switching network and electric L sense, enter into sampling resistor Rsns, the hot end of sampling resistor is received charging current circuit is set, the cold end of sampling resistor is received the negative input end of charging current sampled signal amplifying circuit, and the output that charging current arranges circuit is received the positive input terminal of charging current sampled signal amplifying circuit.The output voltage that battery voltage sampling resistance obtains enters into the positive input terminal of battery voltage sampling signal amplification circuit, the negative input end access reference voltage Vref of battery voltage sampling signal amplification circuit.An output of charging current sampled signal amplifying circuit is received the positive input terminal of the first buffer 1, and another output is received the input Iin end of battery voltage sampling signal amplification circuit.The source of a P type metal-oxide-semiconductor is received in the output of battery voltage sampling signal amplification circuit, and the source of this P type metal-oxide-semiconductor is with together with grid terminate at, and drain terminal is received the positive input terminal of the first buffer 1.One of I-V transfer resistance terminates to the positive input terminal of the first buffer 1, negative input end and the output of the other end and the second buffer 2, and the positive input terminal of compensating network is received same node.The negative input end of the negative input end of the first buffer 1, output and compensating network is received same node.The positive input terminal access reference voltage Vref of the second buffer 2.The positive input terminal of PWM comparator is received in the output of compensating network, the negative input end access sawtooth waveforms of PWM comparator, and its output is received the logic control part.The output of logic control part is respectively the driver1 that controls PMOS power tube M1 and the input of controlling the driver2 of continued flow tube M2.
Shown in Fig. 1 in circuit, before the sampled voltage Vfb obtained at battery voltage sampling circuit does not reach Vref, be cell voltage while not reaching float charge voltage, the output end voltage of battery voltage sampling signal amplification circuit is lower, does not make to connect into the P type metal-oxide-semiconductor M3 conducting of diode form.Now, by switching network, inductance, charging current sample circuit, charging current, circuit, charging current sampled signal amplifying circuit, I-V transfer resistance, buffer, compensating network, PWM comparator are set and form the constant current charge loop, lithium ion battery is carried out to constant current charge.
As shown in Figure 2, charging current provided by the invention arranges circuit and is comprised of adjustable resistance R3, the 4th resistance R 4 and current source Icurrentset.The voltage of the hot end CHSENSE of sampling resistor RSNS is V
cHSENSE, the pressure drop on adjustable resistance R3 is Icurrentset * R3, therefore, the expression formula that charging current arranges the output voltage of circuit is:
V
currentset＝V
CHSENSE-I
currentset×R
3。
As shown in Figure 3, charging current sampled signal amplifying circuit provided by the invention, consist of operational transconductance amplifier.By the difference of the voltage of the voltage of positive input terminal and negative input end, charging current arranges the difference of the voltage VBATSENSE of the voltage Vcurrentset of output of circuit and lithium ion battery anode, converts electric current G to
mi(V
currentset-V
bATSENSE) and k * G
mi(V
currentset-V
bATSENSE), K is constant, G
migain for charging current sampled signal amplifying circuit.Electric current G
mi(V
currentset-V
bATSENSE), electric current I i, flow into the I-V transfer resistance, thereby change the voltage of the positive input terminal of buffer 1, and its output end voltage is also along with change, and the voltage of the negative input end of error network has also changed.Therefore, by the control of loop, realize the constant current charge to lithium ion battery.Simultaneously, loop is by feeding back the positive input terminal voltage of charging current sampled signal amplifying circuit and the voltage clamp of negative input end, i.e. Vcurrentset=V
bATSENSE.According to:
V
BATSENSE＝V
CHSENSE-I
o×R
SNS；
It is known,
As shown in Figure 4, battery voltage sampling signal amplification circuit provided by the invention, consist of operational transconductance amplifier.Anode access reference voltage V
ref, the sampled signal V of negative terminal access battery voltage sampling circuit
fB, by the voltage V of positive input terminal
refvoltage V with negative input end
fBgeneration current G
mv(V
fB-V
ref), G
mvgain for the battery voltage sampling signal amplification circuit.Input I
inthe size that termination enters charging current sampled signal amplifying circuit to be provided is k*G
mi(V
currentset-V
bATSENSE) electric current, this electric current be exaggerated 1/k doubly after, with electric current G
mv(V
fB-V
ref) subtract each other, the electric current provided to output is G
mv(V
fB-V
ref)-G
mi(V
currentset-V
bATSENSE), output is received the source of p type field effect transistor M3.Work as V
fBwhile being greater than Vref, the voltage of the output of battery voltage sampling signal amplification circuit increases to and makes the M3 conducting, and charging process enters into the constant voltage charge stage.Now, the electric current of M3 drain terminal by the expression formula that M3 flow into the electric current I v of I-V transfer resistance is
I
v＝G
mv(V
FB-V
ref)-G
mi(V
currentset-V
BATSENSE)；
As shown in Figure 1, known, the electric current that the constant voltage charge stage flow into the I-V transfer resistance is Iv+Ii, that is:
From above formula, in the constant voltage charge stage, the size of current that flow into the I-V transfer resistance is determined by the sampled voltage VFB of battery voltage sampling circuit acquisition and the difference of reference voltage Vref fully.Now, by switching network, inductance, battery voltage sampling circuit, battery voltage sampling signal amplification circuit, I-V transfer resistance, buffer, compensating network, PWM comparator, form the constant voltage charge loop, lithium ion battery is carried out to constant voltage charge.Thereby realized constant current charge taking over seamlessly to constant voltage charge.
Claims (3)
1. a lithium ion battery switched charge circuit, comprise that switching network, inductance L, charging current sample circuit, charging current arrange circuit, charging current sampled signal amplifying circuit, battery voltage sampling circuit, battery voltage sampling signal amplification circuit, transfer resistance, the first buffer, the second buffer, compensating network, PWM comparator and logic control circuit; Wherein, the input termination power of switching network, output connect an end of inductance L, the input of another termination charging current sample circuit of inductance L; The output of charging current sample circuit connects the input of battery voltage sampling circuit, and the output of battery voltage sampling circuit connects the positive pole of lithium ion battery;
The charging current sample circuit comprises sampling resistor Rsns, and the voltage at sampling resistor Rsns two ends is sampled, output high potential sampling end and electronegative potential sampling end, described high potential sampling end is connected with the input that charging current arranges circuit, the electronegative potential sampling end is connected with the negative input end of charging current sampled signal amplifying circuit, and the output that charging current arranges circuit is connected with the positive input terminal of charging current sampled signal amplifying circuit;
Charging current sampled signal amplifying circuit consists of operational transconductance amplifier, the two-way branch current size of output is ratio, the difference that the size of current of the first output branch road is high potential sampling end and electronegative potential sampling end, the K that the size of current of the second output branch road is high potential sampling end and electronegative potential sampling end difference doubly gains, and described K is constant;
Battery voltage sampling circuit comprises the first resistance R 1 and the second resistance R 2, one end of the first resistance R 1 is connected with the positive pole of charging current sample circuit and lithium ion battery, the other end is connected with an end of the second resistance R 2, the other end ground connection of the second resistance R 2, the high potential signal sampling of battery voltage sampling circuit to the second resistance R 2 one ends, the voltage sampling signal of output;
The battery voltage sampling signal amplification circuit consists of operational transconductance amplifier, and first input end is connected with the second output branch road of charging current sampled signal amplifying circuit, the second input is connected with reference voltage, the 3rd input is connected with voltage sampling signal;
The output of battery voltage sampling signal amplification circuit is exported after branch road is connected and is connected to an end of transfer resistance and the positive input terminal of the first buffer by switching tube and first of charging current sampled signal amplifying circuit, after being connected with output, the negative input end of the first buffer is connected with the negative input end of compensating network, the positive input terminal of the negative input end of the other end of transfer resistance and the second buffer, the output of the second buffer and compensating network is connected, and the positive input terminal of the second buffer connects reference voltage;
The output of compensating network is connected with the positive input terminal of PWM comparator, and the negative input termination sawtooth waveforms of PWM comparator, output connect the input of logic control circuit, and the output of logic control circuit is connected with switching network.
2. a kind of lithium ion battery switched charge circuit according to claim 1, it is characterized in that, described switching network comprises PMOS pipe and NMOS pipe, the source electrode of PMOS pipe connects after power supply, drain electrode are connected with the drain electrode of NMOS pipe and is connected with an end of inductance L, the grid of the grid of PMOS pipe and NMOS pipe connects respectively the two path control signal of logic control circuit output, the source ground of NMOS pipe.
3. a kind of lithium ion battery switched charge circuit according to claim 2, is characterized in that, described charging current arranges circuit and comprises the 3rd resistance R 3, the 4th resistance R 4 and current source; The output that the hot end of described the 3rd resistance R 3 is connected with the hot end of sampling resistor Rsns, electronegative potential and an end of the 4th resistance R 4 are connected and arrange as charging current circuit, the other end of the 4th resistance R 4 connects the positive pole of current source, the minus earth of current source; Described the 3rd resistance R 3 is adjustable resistance.
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| CN201310369537.0A CN103457320B (en) | 2013-08-22 | 2013-08-22 | Lithium ion battery switch charging circuit |
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| CN201310369537.0A CN103457320B (en) | 2013-08-22 | 2013-08-22 | Lithium ion battery switch charging circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106712130A (en) * | 2015-07-31 | 2017-05-24 | 苏州易能微电子科技有限公司 | Novel charging control system and method |
| CN107465217A (en) * | 2016-06-03 | 2017-12-12 | 深圳市富满电子集团股份有限公司 | A kind of switching mode lithium battery charging circuit and chip without current sampling resistor |
| CN110445362A (en) * | 2019-08-19 | 2019-11-12 | 电子科技大学 | A kind of transient state enhancing circuit suitable for Buck converter |
| CN113922683A (en) * | 2021-09-26 | 2022-01-11 | 西北工业大学 | Single-stage wireless charging circuit based on digital rectifier |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101364742A (en) * | 2008-06-16 | 2009-02-11 | 广州南科集成电子有限公司 | Lithium battery charger controlling integrated circuit and constant-current constant-voltage control circuit thereof |
| JP2009100580A (en) * | 2007-10-17 | 2009-05-07 | Rohm Co Ltd | Charge control circuit, and charging circuit and electronic apparatus using same |
| CN101814756A (en) * | 2010-04-12 | 2010-08-25 | 深圳市纳芯威科技有限公司 | Constant-current and constant-voltage control circuit, charging circuit and charger |
| US20120169294A1 (en) * | 2011-01-04 | 2012-07-05 | Richtek Technology Corp. | Circuit and method for power path management |
| CN103151824A (en) * | 2013-03-29 | 2013-06-12 | 哈尔滨工业大学 | Lithium battery charging control circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202931012U (en) * | 2012-11-19 | 2013-05-08 | 萨康电子（上海）有限公司 | Charger circuit capable of changing from constant current mode to constant voltage mode |
-
2013
- 2013-08-22 CN CN201310369537.0A patent/CN103457320B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009100580A (en) * | 2007-10-17 | 2009-05-07 | Rohm Co Ltd | Charge control circuit, and charging circuit and electronic apparatus using same |
| CN101364742A (en) * | 2008-06-16 | 2009-02-11 | 广州南科集成电子有限公司 | Lithium battery charger controlling integrated circuit and constant-current constant-voltage control circuit thereof |
| CN101814756A (en) * | 2010-04-12 | 2010-08-25 | 深圳市纳芯威科技有限公司 | Constant-current and constant-voltage control circuit, charging circuit and charger |
| US20120169294A1 (en) * | 2011-01-04 | 2012-07-05 | Richtek Technology Corp. | Circuit and method for power path management |
| CN103151824A (en) * | 2013-03-29 | 2013-06-12 | 哈尔滨工业大学 | Lithium battery charging control circuit |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106712130A (en) * | 2015-07-31 | 2017-05-24 | 苏州易能微电子科技有限公司 | Novel charging control system and method |
| CN107465217A (en) * | 2016-06-03 | 2017-12-12 | 深圳市富满电子集团股份有限公司 | A kind of switching mode lithium battery charging circuit and chip without current sampling resistor |
| CN107465217B (en) * | 2016-06-03 | 2023-03-21 | 富满微电子集团股份有限公司 | Switch type lithium battery charging circuit and chip without current sampling resistor |
| CN110445362A (en) * | 2019-08-19 | 2019-11-12 | 电子科技大学 | A kind of transient state enhancing circuit suitable for Buck converter |
| CN113922683A (en) * | 2021-09-26 | 2022-01-11 | 西北工业大学 | Single-stage wireless charging circuit based on digital rectifier |
| CN113922683B (en) * | 2021-09-26 | 2023-10-03 | 西北工业大学 | Single-stage wireless charging circuit based on digital rectifier |
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