CN101364742B - Lithium battery charger controlling integrated circuit and constant-current constant-voltage control circuit thereof - Google Patents
Lithium battery charger controlling integrated circuit and constant-current constant-voltage control circuit thereof Download PDFInfo
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- CN101364742B CN101364742B CN2008100288085A CN200810028808A CN101364742B CN 101364742 B CN101364742 B CN 101364742B CN 2008100288085 A CN2008100288085 A CN 2008100288085A CN 200810028808 A CN200810028808 A CN 200810028808A CN 101364742 B CN101364742 B CN 101364742B
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Abstract
The invention discloses a lithium battery charger control integrated circuit with short charging time and low no-load power consumption and a constant-current and constant-voltage control circuit. Thecontrol circuit includes a voltage sampling resistor network, a comparer (OP4), an SMIT circuit, and a main charging P-MOSFET (P79), wherein the voltage dividing terminal (T) of the voltage samplingresistor network is connected with the in-phase input terminal of the comparer (OP4), and the reference voltage input terminal (L1) is connected with the reversed-phase input terminal of the comparer(OP4); the input terminal of the SMIT circuit is connected with the output terminal of the comparer (OP4), and the output terminal is connected with the gates of a switch control P-MOSFET (P93) and anN-MOSFET (N72); the source and the drain of the switch control P-MOSFET (P93) are respectively connected with the output terminal of the comparer (OP4) and the gate of the main charging P-MOSFET (P79); and the source and the drain of the switch control N-MOSFET (N72) are respectively connected with an earth terminal and the gate of the main charging P-MOSFET (P79).
Description
Technical field
The present invention relates to a kind of lithium battery charger controlled integrated circuit and constant-current and constant-voltage control circuit thereof.
Background technology
Generally use rechargeable lithium ion battery as power supply at present on electronic products such as mobile phone, this lithium ion battery need adopt charger to charge.Lithium battery charger mostly adopts various special-purpose control integrated circuit (IC) and various sample circuit at present.Current general lithium battery charger adopts bipolar amplifier (as LM358) control discrete device PNP (as S8550) that lithium battery is carried out the pressure limiting charging mostly, in charging process, along with the rising that is recharged cell voltage, its charging current constantly reduces, reach its set point (general nominal value is 4.2V) up to charged battery voltage, charging voltage remained unchanged and kept little electric current and discharge and recharge this moment, made battery reach balance.The shortcoming of this charger be the charging interval long, no-load power consumption is big.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiencies in the prior art, and the constant-current and constant-voltage control circuit of the lithium battery charger controlled integrated circuit that a kind of charging interval is short, no-load power consumption is little, charging effect is good is provided.
In addition, the present invention also provides a kind of lithium battery charger controlled integrated circuit that adopts this constant-current and constant-voltage control circuit.
The technical scheme that constant-current and constant-voltage control circuit adopted of lithium battery charger controlled integrated circuit of the present invention is: the constant-current and constant-voltage control circuit of lithium battery charger controlled integrated circuit of the present invention comprises the lithium battery anode port, power input, reference voltage input, the voltage sample resistor network, comparator, Schmidt trigger circuit, main charging P-MOSFET, switch control P-MOSFET, switch control N-MOSFET, described voltage sample resistor network comprises the sampled voltage end, divide pressure side, earth terminal, described sampled voltage end is connected with described anodal port, pressure side was connected with the in-phase input end of described comparator in described minute, described reference voltage input is connected with the inverting input of described comparator, the input of described Schmidt trigger circuit is connected with the output of described comparator, the output of described Schmidt trigger circuit is connected with the grid of described switch control P-MOSFET and the grid of described switch control N-MOSFET, the source electrode of described switch control P-MOSFET, drain electrode is connected with the output of described comparator and the grid of described main charging P-MOSFET respectively, the source electrode of described switch control N-MOSFET, the grid of described respectively earth terminal and described main charging P-MOSFET of draining is connected the source electrode of described main charging P-MOSFET, the drain electrode respectively with described power input, described anodal port is connected.
Be connected to two groups of resistance that are connected parallel with one another between described minute pressure side of described voltage sample resistor network and the described earth terminal, described sampled voltage end and also be connected to resistance between the pressure side in described minute, the resistance value of each described resistance all equates, the proportionate relationship between the voltage of controlling described sampled voltage end by the quantity and the annexation of each described resistance and the magnitude of voltage of described minute pressure side.
The technical scheme that lithium battery charger controlled integrated circuit of the present invention adopted is: lithium battery charger controlled integrated circuit of the present invention comprises constant-current and constant-voltage control circuit, described constant-current and constant-voltage control circuit comprises the lithium battery anode port, power input, reference voltage input, the voltage sample resistor network, comparator, Schmidt trigger circuit, main charging P-MOSFET, switch control P-MOSFET, switch control N-MOSFET, described voltage sample resistor network comprises the sampled voltage end, divide pressure side, earth terminal, described sampled voltage end is connected with described anodal port, pressure side was connected with the in-phase input end of described comparator in described minute, described reference voltage input is connected with the inverting input of described comparator, the input of described Schmidt trigger circuit is connected with the output of described comparator, the output of described Schmidt trigger circuit is connected with the grid of described switch control P-MOSFET and the grid of described switch control N-MOSFET, the source electrode of described switch control P-MOSFET, drain electrode is connected with the output of described comparator and the grid of described main charging P-MOSFET respectively, the source electrode of described switch control N-MOSFET, the grid of described respectively earth terminal and described main charging P-MOSFET of draining is connected the source electrode of described main charging P-MOSFET, the drain electrode respectively with described power input, described anodal port is connected.
Be connected to two groups of resistance that are connected parallel with one another between described minute pressure side of described voltage sample resistor network and the described earth terminal, described sampled voltage end and also be connected to resistance between the pressure side in described minute, the resistance value of each described resistance all equates, the proportionate relationship between the voltage of controlling described sampled voltage end by the quantity and the annexation of each described resistance and the magnitude of voltage of described minute pressure side.
The invention has the beneficial effects as follows: because constant-current and constant-voltage control circuit of the present invention comprises the lithium battery anode port, power input, reference voltage input, the voltage sample resistor network, comparator, Schmidt trigger circuit, main charging P-MOSFET, switch control P-MOSFET, switch control N-MOSFET, described voltage sample resistor network comprises the sampled voltage end, divide pressure side, earth terminal, described sampled voltage end is connected with described anodal port, pressure side was connected with the in-phase input end of described comparator in described minute, described reference voltage input is connected with the inverting input of described comparator, the input of described Schmidt trigger circuit is connected with the output of described comparator, the output of described Schmidt trigger circuit is connected with the grid of described switch control P-MOSFET and the grid of described switch control N-MOSFET, the source electrode of described switch control P-MOSFET, drain electrode is connected with the output of described comparator and the grid of described main charging P-MOSFET respectively, the source electrode of described switch control N-MOSFET, the grid of described respectively earth terminal and described main charging P-MOSFET of draining is connected, the source electrode of described main charging P-MOSFET, the drain electrode respectively with described power input, described anodal port is connected, the present invention has utilized the inconsistent characteristic of the desired high-low level of Schmidt trigger circuit input to realize constant-current constant-voltage charging, when battery both end voltage during less than 4.2V, the voltage of described minute pressure side is less than reference voltage, then described comparator output low level, along with the increase cell voltage in charging interval also increases, described comparator output voltage also constantly increases, before the output voltage of described comparator does not reach the upset level of described Schmidt trigger circuit, described Schmidt trigger circuit is exported high level all the time, make described switch control P-MOSFET turn-off, the grid level of described main charging P-MOSFET directly is pulled down to ground level by described switch control N-MOSFET, makes the grid of described main charging P-MOSFET and the voltage V between the source electrode
GSConstant current charge under the situation of=VDD, reach 4.2V up to the cell voltage that is recharged, this moment, the voltage of described minute pressure side equaled reference voltage, then described comparator output high level reaches the upset level of described Schmidt trigger circuit, make described Schmidt trigger circuit output low level, make described switch control P-MOSFET conducting, make the grid of described main charging P-MOSFET controlled by described comparator, cause the voltage stabilizing of charging output voltage at 4.2V, charging current constantly reduces, be full of electricity up to battery, so the charging interval of the present invention is short, no-load power consumption is little, charging effect is good;
Owing to be connected to two groups of resistance that are connected parallel with one another between described minute pressure side of voltage sample resistor network of the present invention and the described earth terminal, described sampled voltage end and also be connected to resistance between the pressure side in described minute, the resistance value of each described resistance all equates, proportionate relationship between the voltage of controlling described sampled voltage end by the quantity and the annexation of each described resistance and the magnitude of voltage of described minute pressure side, the present invention has utilized the characteristics of the charging voltage of general lithium battery charger for 4.2V, the voltage of quantity by each described resistance and described minute pressure side of annexation control, when being sampled voltage is that described sampled voltage end is when being 4.2V, the voltage of described minute pressure side is a fixed value, when adopting reference voltage to equal the voltage of described minute pressure side, be easy to utilize operational amplifier to realize the voltage stabilizing of 4.2V, the concrete resistance value and the precision thereof of described dividing potential drop terminal voltage value and each described resistance all have nothing to do, and only need each described resistance is that the identical resistance of specification just can accurately be determined sampled voltage, easily in integrated circuit, realize, so that the present invention makes is easy, sampling accurately, charging process control accurately.
Description of drawings
Fig. 1 is the circuit theory diagrams of the constant-current and constant-voltage control circuit of lithium battery charger controlled integrated circuit of the present invention;
Fig. 2 is the circuit theory diagrams of lithium battery charger controlled integrated circuit of the present invention;
Fig. 3 is that of lithium battery charger controlled integrated circuit of the present invention uses connection diagram.
Embodiment
As Fig. 1; Fig. 2; shown in Figure 3; lithium battery charger controlled integrated circuit of the present invention comprises charging indication control circuit 2; short-circuit protection circuit 3; polar switching switch control circuit 4 and constant-current and constant-voltage control circuit; described constant-current and constant-voltage control circuit comprises lithium battery anode port BT+; power input VDD; reference voltage input L1; voltage sample resistor network 1; comparator OP4; Schmidt trigger circuit SMIT; main charging P-MOSFET P79; switch control P-MOSFET P93; switch control N-MOSFET N72; described voltage sample resistor network 1 comprises the sampled voltage end; divide pressure side T; earth terminal; described sampled voltage end is connected with described anodal port BT+; the in-phase input end of described minute pressure side T and described comparator OP4+be connected; the inverting input of described reference voltage input L1 and described comparator OP4-be connected; the input of described Schmidt trigger circuit SMIT is connected with the output of described comparator OP4; the output of described Schmidt trigger circuit SMIT is connected with the grid of described switch control P-MOSFET P93 and the grid of described switch control N-MOSFET N72; the source electrode of described switch control P-MOSFET P93; drain electrode is connected with the output of described comparator OP4 and the grid of described main charging P-MOSFET P79 respectively; the source electrode of described switch control N-MOSFETN72; the grid of described respectively earth terminal and described main charging P-MOSFET P79 of draining is connected the source electrode of described main charging P-MOSFET P79; the drain electrode respectively with described power input VDD; described anodal port BT+ is connected.
Set reference voltage V
L1=1.68V, the present invention is as follows to the control procedure that lithium battery carries out constant-current constant-voltage charging:
(1) originally, the voltage V of described anodal port BT+
BT+＜4.2V, the voltage V of described minute pressure side T
T＜1.68V, make described comparator OP4 output low level, along with the increase cell voltage in charging interval also increases, the output voltage of described comparator OP4 also constantly increases, before the output voltage of described comparator OP4 does not reach the upset level of described Schmidt trigger circuit SMIT, described Schmidt trigger circuit is exported high level all the time, therefore described switch control P-MOSFET P93 turn-offs, described switch control N-MOSFET N72 conducting, the grid level of described main charging P-MOSFET P79 directly is pulled down to ground level by described switch control N-MOSFET N72, make described main charging P-MOSFET P79 conducting, make the grid of described main charging P-MOSFET P79 and the voltage between the source electrode at V
GSUnder the situation of=VDD battery is carried out constant current charge, reach 4.2V up to the cell voltage that is recharged;
(2) as the cell voltage V that is recharged
BT+During=4.2V, the voltage V of described minute pressure side
T=1.68V, described comparator OP4 output output high level reaches the upset level of described Schmidt trigger circuit SMIT, make described Schmidt trigger circuit output low level, make described switch control N-MOSFET N72 shutoff, described switch control P-MOSFET P93 conducting, this moment, the grid of described main charging P-MOSFET P79 was directly controlled by the output of described comparator OP4 directly, made the charging output voltage V
BT+Voltage stabilizing remains on 4.2V, and so that battery is carried out constant voltage charge, this moment, charging current constantly reduced, till battery is full of electricity.
Being connected to two groups of resistance that are connected parallel with one another between described minute pressure side T of described voltage sample resistor network 1 and the described earth terminal is R21 for one group, other one group is R22, R23 series connection, described sampled voltage end and also be connected to a resistance R 20 in described minute between the pressure side T, the resistance value of each described resistance R 20, R21, R22, R23 all equates, the proportionate relationship between the voltage of controlling described sampled voltage end by quantity and the annexation of each described resistance R 20, R21, R22, R23 and the magnitude of voltage of described minute pressure side T.Utilize the characteristics of the charging voltage of lithium battery charger for 4.2V, when being sampled voltage is that described sampled voltage end is when being 4.2V, the voltage of described minute pressure side T is 1.68V, when adopting the benchmark of reference voltage V ref=1.68V, be easy to utilize operational amplifier to realize the voltage stabilizing of 4.2V, described minute pressure side T magnitude of voltage and each described resistance R 20, R21, R22, concrete resistance value and the precision thereof of R23 all have nothing to do, and only need each described resistance is that the identical resistance of specification just can accurately be determined sampled voltage, easily in integrated circuit, realize, so the present invention makes easy, sampling accurately, charging process control accurately.
Certainly, the quantity of resistance of the present invention and concrete connected mode are not limited to described in the above embodiment, can carry out respective change such as the quantity of the resistance of two groups of connections parallel with one another, to satisfy the requirement of different reference voltages.
Lithium battery charger controlled integrated circuit of the present invention has power input VDD, earth terminal GND, lithium battery both positive and negative polarity port BT+, BT-, external capacitor port CBP, and power supply is indicated port L3, charging indication port L2, saturated indication port L1, therefore pin outside 8 is arranged after encapsulation, and peripheral circuit is very simple, peripheral cell is few, integrated degree height is easy to promote and use.
The present invention can be widely used in the lithium cell charging field.
Claims (4)
1. the constant-current and constant-voltage control circuit of a lithium battery charger controlled integrated circuit, it is characterized in that: comprise lithium battery anode port (BT+), power input (VDD), reference voltage input (L1), voltage sample resistor network (1), comparator (OP4), Schmidt trigger circuit (SMIT), main charging P-MOSFET (P79), switch control P-MOSFET (P93), switch control N-MOSFET (N72), described voltage sample resistor network (1) comprises the sampled voltage end, divide pressure side (T), earth terminal, described sampled voltage end is connected with described anodal port (BT+), described minute pressure side (T) be connected with the in-phase input end (+) of described comparator (OP4), described reference voltage input (L1) is connected with the inverting input (-) of described comparator (OP4), the input of described Schmidt trigger circuit (SMIT) is connected with the output of described comparator (OP4), the output of described Schmidt trigger circuit (SMIT) is connected with the grid of described switch control P-MOSFET (P93) and the grid of described switch control N-MOSFET (N72), the source electrode of described switch control P-MOSFET (P93), drain electrode is connected with the output of described comparator (OP4) and the grid of described main charging P-MOSFET (P79) respectively, the source electrode of described switch control N-MOSFET (N72), the grid of drain electrode described earth terminal of difference and described main charging P-MOSFET (P79) is connected, the source electrode of described main charging P-MOSFET (P79), the drain electrode respectively with described power input (VDD), described anodal port (BT+) is connected.
2. the constant-current and constant-voltage control circuit of lithium battery charger controlled integrated circuit according to claim 1, it is characterized in that: described voltage sample resistor network (1) described minute pressure side (T) with described earth terminal between be connected to two groups of resistance (R21 that are connected parallel with one another, R22, R23), described sampled voltage end and also be connected to resistance (R20) between pressure side (T) in described minute, each described resistance (R20, R21, R22, R23) resistance value all equates, by each described resistance (R20, R21, R22, R23) quantity and annexation control described sampled voltage end voltage and described minute pressure side (T) magnitude of voltage between proportionate relationship.
3. lithium battery charger controlled integrated circuit, comprise constant-current and constant-voltage control circuit, it is characterized in that: described constant-current and constant-voltage control circuit comprises lithium battery anode port (BT+), power input (VDD), reference voltage input (L1), voltage sample resistor network (1), comparator (OP4), Schmidt trigger circuit (SMIT), main charging P-MOSFET (P79), switch control P-MOSFET (P93), switch control N-MOSFET (N72), described voltage sample resistor network (1) comprises the sampled voltage end, divide pressure side (T), earth terminal, described sampled voltage end is connected with described anodal port (BT+), described minute pressure side (T) be connected with the in-phase input end (+) of described comparator (OP4), described reference voltage input (L1) is connected with the inverting input (-) of described comparator (OP4), the input of described Schmidt trigger circuit (SMIT) is connected with the output of described comparator (OP4), the output of described Schmidt trigger circuit (SMIT) is connected with the grid of described switch control P-MOSFET (P93) and the grid of described switch control N-MOSFET (N72), the source electrode of described switch control P-MOSFET (P93), drain electrode is connected with the output of described comparator (OP4) and the grid of described main charging P-MOSFET (P79) respectively, the source electrode of described switch control N-MOSFET (N72), the grid of drain electrode described earth terminal of difference and described main charging P-MOSFET (P79) is connected, the source electrode of described main charging P-MOSFET (P79), the drain electrode respectively with described power input (VDD), described anodal port (BT+) is connected.
4. lithium battery charger controlled integrated circuit according to claim 3, it is characterized in that: described voltage sample resistor network (1) described minute pressure side (T) with described earth terminal between be connected to two groups of resistance (R21 that are connected parallel with one another, R22, R23), described sampled voltage end and also be connected to resistance (R20) between pressure side (T) in described minute, each described resistance (R20, R21, R22, R23) resistance value all equates, by each described resistance (R20, R21, R22, R23) quantity and annexation control described sampled voltage end voltage and described minute pressure side (T) magnitude of voltage between proportionate relationship.
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| CN103457320B (en) * | 2013-08-22 | 2015-05-27 | 电子科技大学 | Lithium ion battery switch charging circuit |
| CN115765120B (en) * | 2023-01-10 | 2023-07-07 | 禹创半导体(深圳)有限公司 | Charging device |
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