CN210380277U - Battery charging system - Google Patents
Battery charging system Download PDFInfo
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- CN210380277U CN210380277U CN201920343992.6U CN201920343992U CN210380277U CN 210380277 U CN210380277 U CN 210380277U CN 201920343992 U CN201920343992 U CN 201920343992U CN 210380277 U CN210380277 U CN 210380277U
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Abstract
The utility model discloses a battery charging system, this system include power output module, rechargeable battery, on-off control circuit, loop compensation network, charging current sampling circuit and input power supply current self-adaptation circuit, and input power supply current self-adaptation circuit includes: the voltage dividing resistors RD1 and RD2 are used for acquiring input voltage in real time, the first error amplifier EA1 is used for amplifying the difference value between a power supply voltage signal acquired by the voltage dividing resistors and reference voltage VREF and converting the difference value into error current IEA1, and the NMOS transistor MN1 is used for outputting the error current of the first error amplifier EA1 to a COMP node of the loop compensation network and adjusting the COMP voltage. After the input power supply voltage signal is reflected to the COMP node through the action of the input power supply current self-adaptive circuit, the power supply current self-adaptive circuit controls the on and off of the power switching tubes MP0 and MN0 through the action of the switch control circuit so as to control the charging current to automatically adapt to the current output capacity of the input power supply.
Description
Technical Field
The utility model relates to a battery charging system especially relates to a battery charging system.
Background
As portable electric devices become more popular and the battery capacity thereof becomes larger, charging currents of these devices become larger and larger in order to charge the portable devices more quickly, and thus there is a problem in that if some large-current charging devices are charged using a general small-current input power (small-current charger), the input power may be repeatedly hiccup and restarted without being charged because the charger cannot supply such a large current, and the input power may be damaged.
Fig. 2 is a conventional battery charging system, in which the charging current is determined by the reference voltage VREF2, the gain G of the current sampling amplifier, and the charging current setting resistor RS1, and the charging current formula is as follows:
the charging system has the following problems: when the reference voltage VREF2, the gain G of the current sampling amplifier, and the value of the charging current setting resistor RS1 are determined, the charging current IC is also determined, and the charging current IC cannot be automatically adjusted according to the actual output current capability of the input power (charger), so that the power is repeatedly hiccup and restarted, and cannot be charged or the input power is damaged.
Fig. 3 is another prior art battery charging system modified from that shown in fig. 2, in which a supply voltage sampling circuit 204 is added to the system shown in fig. 1, and the charging current formula of the charging system is still:
fig. 3 differs from fig. 2 in that VREF2 of fig. 3 is not fixed, but rather is related to the supply voltage output current capability. After the input power is connected to the charging system, if the maximum charging current that the input power can provide is smaller than the maximum charging current that the device sets, under the action of CLK, the value of (Q1: Qn) and the corresponding output voltage VREF2 of the digital-to-analog conversion circuit will gradually increase, and the charging current will also gradually increase, when the charging current gradually increases to the maximum current that the input power can provide, the output voltage VDD of the input power will gradually decrease, when VDD decreases to the set detection threshold, the VDDL signal output by the input VDD voltage detection circuit will output low level to the NAND gate nand3 to shield the CLK signal, the count value of (Q1: Qn) and the corresponding 2 are locked and will not change any more, at this time, the input power charges the device with the maximum charging current that the input power can provide by itself, for the charging system, if the battery and the charging control system are permanently and fixedly connected together, i.e., the battery cannot be separated from the charging system, the system can automatically adapt to the output current capability of the input power source in the case that the power source voltage sampling circuit 204 starts to operate after each time the input power source is connected and finally locks VREF2 at a certain value according to the output current capability of the input power source. However, if the battery is detachable, in the case that the input power is first connected to the charging system, since the battery is not connected and the charging current is zero, the input power will not be pulled down all the time, VREF2 will reach the maximum value without being limited by the output capability of the input power, and if the battery is connected to the charging system again, the charging system shown in fig. 1 will also have the same problems. Therefore, it is an urgent need for those skilled in the art to develop a battery charging system with adaptive input power current.
SUMMERY OF THE UTILITY MODEL
The utility model provides a solve the above-mentioned not enough, provide a battery charging system, use the utility model discloses a charging equipment of input power supply current self-adaptation method can be according to the output current ability of the input power that connects, and the charging current of real-time dynamic adjustment equipment, and no matter whether the battery can be dismantled, can guarantee all that input power can not cause the damage to input power supply when charging for equipment with the maximum current that self can provide.
The above object of the present invention is achieved by the following technical solutions: a battery charging system comprises a charging current sampling circuit 202, a loop compensation network 201, a switch control circuit 203, a power output module 204, an input power current self-adapting circuit 200 and a charging battery; the charging current sampling circuit 202, the loop compensation network 201, the switch control circuit 203 and the power output module 204 are sequentially connected, the power output module 204 is connected to the charging current sampling circuit 202, the charging current sampling circuit 202 is connected with a rechargeable battery, a branch circuit is connected between the loop compensation network 201 and the switch control circuit 203 and is connected with the input power supply current self-adaptive circuit 200, and the input power supply current self-adaptive circuit 200 is connected with a VDD end of the power output module 204.
The charging current sampling circuit is composed of a sampling resistor RS1, a current sampling operational amplifier, a second error amplifier EA2 and a current output NMOS transistor MN2, is used for sampling charging current in real time, is converted into an error current signal IEA2 after amplification processing, and is output to a COMP node of a loop compensation network through an output NMOS transistor MN 2.
The loop compensation network consists of a constant current source I1, a compensation resistor R1 and a compensation capacitor C1 and is used for ensuring the stability of COMP voltage when the output of the charging current sampling circuit and the input power supply current self-adaptive circuit adjusts the voltage of a COMP node, and further ensuring the working stability of the loop of the whole charging system.
The switch control circuit comprises an inductive current sampling circuit, a voltage comparator and a logic control circuit, wherein the inductive current sampling circuit samples inductive current in real time and converts the inductive current into corresponding voltage, the voltage is sent to the voltage comparator to be compared with the voltage of an output signal COMP of a compensation network, the comparison result is output to the logic control circuit, then the logic control circuit outputs two driving signals PG and NG to power switch tubes MP0 and MN0 respectively, and the power switch tubes MP0 and MN0 are controlled to be switched on and switched off.
The power output module consists of power switch tubes MP0, MN0 and an inductor L1, and under the control of an output signal of the switch control circuit, the energy of an input power supply is safely and reliably transferred to a battery.
The input power supply current self-adaptive circuit is composed of a divider resistor network, a first error amplifier EA1 and a current output NMOS transistor MN1, wherein the divider resistors RD1 and RD2 are connected, the other end of the RD2 is connected with an input power supply VDD, the other end of the RD1 is grounded, a connecting end VSENSE of RD1 and RD2 is connected with an inverting input end of the first error amplifier EA1, a positive phase input end of the first error amplifier is connected with a reference voltage VREF1, an output end of the first error amplifier is connected with a grid electrode of the current output NMOS transistor MN1, a source electrode of the MN1 is grounded, and a drain electrode of the MN1 is connected with a COMP node of the. The circuit samples an input power voltage VDD signal in real time, if the output current capacity of an input power is smaller than the charging current set by the charging system, the VDD voltage is pulled down, when the VSENSE voltage acquired by a voltage dividing resistor is lower than the positive input voltage VREF1 of a first error amplifier EA1, an error amplifier EA1 amplifies the difference signal of the two and converts the amplified difference signal into an error current IEA1, the error current IEA1 is output by a current output NMOS transistor MN1 to adjust the COMP voltage, the charging current is further adjusted, the VDD voltage is finally stabilized at a preset value VDDdHOLD, and the value of the VDDHOLD is determined by the following formula:
battery charging system with input power supply current self-adaptation function, its principle and the step that adapt to input power supply as follows:
(1) acquiring an input power supply voltage signal in real time by voltage dividing resistors RD1 and RD2, and transmitting the acquired signal VSENSE to an inverting input end of a first error amplifier EA 1;
(2) the first error amplifier EA1 compares the received power voltage signal VSENSE with a reference voltage VREF1, if VSENSE is greater than VREF1, EA1 controls MN1 to turn off without current output, and if VSENSE is less than VREF1, EA1 amplifies the difference and converts the difference into an error current signal IEA 1;
(3) the NMOS transistor MN1 outputs the error current signal IEA1 converted by the first error amplifier EA1 to a COMP node of the loop compensation network, and the voltage of the COMP node is regulated under the combined action of the error current signal IEA2 output by the NMOS transistor MN2 in the charging current sampling circuit;
(4) the COMP signal is transmitted to a voltage comparator of the switch control circuit and is compared with an inductance current signal sampled by the inductance peak value sampling circuit, so that the power switch tubes MP0 and MNO are controlled to be switched on and off to control the charging current to be automatically adaptive to the current output capacity of the input power supply.
Compared with the prior art, the utility model the advantage be: the utility model discloses a real-time dynamic monitoring input power supply voltage's mode, when input power supply's output current ability is less than the charging current that this charging system set for, can automatic lowering system's charging current, finally make input power supply voltage stable at preset's magnitude of voltage VDDOLD, avoided input power supply to be dead by the heavy current force and restart repeatedly or damage input power supply's risk, whether irrelevant with the battery be fixed in charging system simultaneously.
Drawings
Fig. 1 is a schematic diagram of a battery charging system and an input power supply current adaptive method using the battery charging system of the present invention.
FIG. 2 is a schematic diagram of a prior art battery charging system;
FIG. 3 is a schematic diagram of another modified prior art battery charging system;
Detailed Description
The present invention will be described in detail with reference to the following examples.
As shown in fig. 1, the schematic diagram of the battery charging system with the input power current adaptive function according to the present invention is shown, if the output current capability of the input power is not considered, the charging current of the charging system is determined by the charging current sampling circuit 202. Because the power switch tubes MP0 and MN0 are turned on in turn, when the power switch tube MP0 is turned on, the inductor L1 is excited, the charging current passes through the MP0, the inductor L1, the charging current sampling resistor RS1 and the charging battery to the ground from the input power supply VDD, when the power switch tube MN0 is turned on, the inductor L1 is demagnetized, the inductor current passes through the inductor L1, the charging current sampling resistor RS1 and the charging battery to the ground and then returns to the inductor L1 through the MN0, the sampling resistor RS1 sends the collected average current to the current sampling amplifier, the average current is amplified and then output to the second error amplifier EA2, the average current is converted into an error current IEA2 through the second error amplifier and then output to the COMP by the NMOS transistor MN2 to adjust the COMP voltage, if the system is disturbed so that the charging current is larger than the set current, the IEA2 is also increased so that the COMP is reduced, and if the system is disturbed so that the charging current is smaller than the set current, the IEA2 is also increased so that the COMP, the voltage comparator receives an inductive current signal collected by the inductive current sampling unit, compares the inductive current signal with a COMP voltage, and further controls the on and off of the power switch tubes MN0 and MP0 to enable the charging current to be stabilized at a current value set by RS1, wherein the charging current value set by RS1 is as follows:
wherein G is the gain amplification factor of the current sampling operational amplifier, VREF2 is the preset fixed reference voltage, and it can be known from the above formula that the charging current I set by the system is determined under the condition of RS1CAnd is thus determined.
Depending on the output current capability of the input power supply, two possibilities arise:
first, if the output current capability of the input power supply is larger than the charging current I set by the charging systemCThen, the voltage of the input power supply VDD is not pulled down in the charging process, the voltage signal VSENSE acquired by the voltage dividing resistor detecting the voltage of the input power supply is greater than the reference voltage VREF1, the first error amplifier EA1 controls the NMOS transistor MN1 to be turned off, the error current IEA1 is zero, the COMP voltage is only controlled by the error current IEA2 output by the charging current sampling circuit, and at this time, the input power supply is controlled by the charging current I set by the charging systemCThe device is charged.
Secondly, if the output current capability of the input power supply is smaller than the charging current I set by the charging systemCThen the charging system will automatically reduce the charging current to adapt to the output current capability of the input power source, and the adjustment principle and process are as follows:
(1) acquiring an input power supply voltage signal in real time by voltage dividing resistors RD1 and RD2, and transmitting the acquired signal VSENSE to an inverting input end of a first error amplifier EA 1;
(2) the input power supply can not provide the charging current set by the system, so the VDD voltage can be reduced, and the VSENSE voltage acquired by the voltage dividing resistor can be reduced;
(3) the first error amplifier EA1 compares the received power voltage signal VSENSE with the reference voltage VREF1, and once VSENSE is smaller than VREF1, EA1 amplifies the difference and converts the difference into an error current signal IEA 1;
(4) the NMOS transistor MN1 outputs the error current signal IEA1 converted by the first error amplifier EA1 to a COMP node of the loop compensation network, so that the COMP voltage is reduced;
(5) the COMP signal is transmitted to the voltage comparator of the switch control circuit, and compared with the inductor current signal sampled by the inductor peak sampling circuit, since COMP is reduced under the action of IEA1, the inductor peak current sampled by the inductor current sampling unit is also reduced, so the charging current of the system is also reduced, and finally the input power voltage is stabilized at the preset voltage value VDDHOLD, which is determined by voltage dividing resistors RD1, RD2 and the reference voltage VREF1, as follows:
because the input power voltage is regulated and controlled at VDDHOLD, the charging current set by the system will not be pulled down, so that the input power can still work normally even if the output current capability is much smaller than the charging current set by the charging system.
The embodiment of the present invention is implemented in practice, and further includes a module for providing a voltage reference, a module for providing a bias current, an oscillator module, and known modules in some integrated circuit fields such as a battery charging constant voltage module, which are not described one by one here.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all utilize the equivalent structure or equivalent flow transformation that the content of the specification and the embodiment of the present invention do, or directly or indirectly use in other related technical fields, all including in the same way the patent protection scope of the present invention.
Claims (6)
1. A battery charging system comprises a charging current sampling circuit (202), a loop compensation network (201), a switch control circuit (203), a power output module (204) and a rechargeable battery; the method is characterized in that: the charging current self-adaptive circuit comprises a charging current sampling circuit (202), a loop compensation network (201), a switch control circuit (203), a power output module (204) which is connected in sequence, wherein the power output module (204) is connected to the charging current sampling circuit (202), the charging current sampling circuit (202) is connected with a rechargeable battery, a branch circuit is connected between the loop compensation network (201) and the switch control circuit (203) to connect the input power current self-adaptive circuit (200), and the input power current self-adaptive circuit (200) is connected with a VDD end of the power output module (204).
2. A battery charging system according to claim 1, wherein: the charging current sampling circuit is composed of a sampling resistor RS1, a current sampling operational amplifier, a second error amplifier EA2 and a current output NMOS transistor MN2, is used for sampling charging current in real time, is converted into an error current signal IEA2 after amplification processing, and is output to a COMP node of a loop compensation network through an output NMOS transistor MN 2.
3. A battery charging system according to claim 1, wherein: the loop compensation network consists of a constant current source I1, a compensation resistor R1 and a compensation capacitor C1 and is used for ensuring the stability of COMP voltage when the output of the charging current sampling circuit and the input power supply current self-adaptive circuit adjusts the voltage of a COMP node, and further ensuring the working stability of the loop of the whole charging system.
4. A battery charging system according to claim 1, wherein: the switch control circuit comprises an inductive current sampling circuit, a voltage comparator and a logic control circuit, wherein the inductive current sampling circuit samples inductive current in real time and converts the inductive current into corresponding voltage, the voltage is sent to the voltage comparator to be compared with the voltage of an output signal COMP of a compensation network, the comparison result is output to the logic control circuit, then the logic control circuit outputs two driving signals PG and NG to power switch tubes MP0 and MN0 respectively, and the power switch tubes MP0 and MN0 are controlled to be switched on and switched off.
5. A battery charging system according to claim 1, wherein: the power output module consists of power switch tubes MP0, MN0 and an inductor L1, and under the control of an output signal of the switch control circuit, the energy of an input power supply is safely and reliably transferred to a battery.
6. A battery charging system according to claim 1, wherein: the input power supply current self-adaptive circuit is composed of a divider resistor network, a first error amplifier EA1 and a current output NMOS transistor MN1, wherein the divider resistors RD1 and RD2 are connected, the other end of the RD2 is connected with an input power supply VDD, the other end of the RD1 is grounded, a connecting end VSENSE of RD1 and RD2 is connected with an inverting input end of the first error amplifier EA1, a positive phase input end of the first error amplifier is connected with a reference voltage VREF1, an output end of the first error amplifier is connected with a grid electrode of the current output NMOS transistor MN1, a source electrode of the MN1 is grounded, and a drain electrode of the MN1 is connected with a COMP node of the.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920343992.6U CN210380277U (en) | 2019-03-07 | 2019-03-07 | Battery charging system |
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| CN201920343992.6U CN210380277U (en) | 2019-03-07 | 2019-03-07 | Battery charging system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113675910A (en) * | 2021-07-23 | 2021-11-19 | 博科能源系统(深圳)有限公司 | Charging control circuit and battery charging system |
| CN116461387A (en) * | 2023-04-04 | 2023-07-21 | 常州汉姆智能科技有限公司 | Unmanned aerial vehicle battery serial connection charge balance circuit |
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2019
- 2019-03-07 CN CN201920343992.6U patent/CN210380277U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113675910A (en) * | 2021-07-23 | 2021-11-19 | 博科能源系统(深圳)有限公司 | Charging control circuit and battery charging system |
| CN113675910B (en) * | 2021-07-23 | 2024-04-05 | 博科能源系统(深圳)有限公司 | Charging control circuit and battery charging system |
| CN116461387A (en) * | 2023-04-04 | 2023-07-21 | 常州汉姆智能科技有限公司 | Unmanned aerial vehicle battery serial connection charge balance circuit |
| CN116461387B (en) * | 2023-04-04 | 2023-10-24 | 常州汉姆智能科技有限公司 | Unmanned aerial vehicle battery serial connection charge balance circuit |
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