CN220358835U

CN220358835U - Acceleration charging circuit

Info

Publication number: CN220358835U
Application number: CN202321440907.0U
Authority: CN
Inventors: 冯杰丰; 王映; 袁红升; 黄晓璇
Original assignee: Shenzhen Abeyuan Technology Co ltd
Current assignee: Shenzhen Abeyuan Technology Co ltd
Priority date: 2023-06-07
Filing date: 2023-06-07
Publication date: 2024-01-16
Anticipated expiration: 2033-06-07

Abstract

The utility model discloses an acceleration charging circuit which comprises a power input module, a PWM module, an output constant voltage and constant current control module, a charging control module and a central control module, wherein the output end of the power input module is connected with the PWM module, the output end of the PWM module is connected with the charging control module, the input end of the output constant voltage and constant current control module is connected with the charging control module, the output end of the output constant voltage and constant current control module is connected with the feedback end of the PWM module, and the central control module is connected with the control end of the charging control module. According to the utility model, only a plurality of detection circuits at the periphery of the MCU are added, and the MCU control is combined, so that the performance of the charger is improved with extremely low cost, the resource utilization is greatly benefited, and meanwhile, the competitiveness of the product is greatly improved.

Description

Acceleration charging circuit

Technical Field

The utility model discloses a charging circuit, in particular to an acceleration charging circuit which can be widely applied to intelligent home, mobile energy storage, new energy, various chargers and the like.

Background

With the wide use of lithium batteries, lead-acid batteries and various chargeable and dischargeable batteries, the charger becomes a product which is visible everywhere in various occasions such as daily life, work, entertainment, leisure and the like. Meanwhile, as the life pace is faster and faster, people pursue higher and higher charging rates of various batteries, so that a charger with higher power is needed to accelerate the charging speed, but the charger with higher power can definitely cause higher direct cost of products, which is not beneficial to popularization at the consumer end.

At present, the conventional technical scheme for solving the problem of quick charge is to install a fan on a charger, so that the charger can output larger power and can provide larger charging current, but some application occasions need to be waterproof, and the installation of the fan is not beneficial to waterproof design; in addition, some chargers originally have fans, and only the cost of the power supply can be increased to increase the charging speed.

Disclosure of Invention

In order to overcome the above-mentioned disadvantage that the charging speed of the charger is increased and the direct cost of the product is required to be increased in the prior art, the present utility model provides an accelerated charging circuit, which adopts a special circuit structure design, can increase the minimum cost on the basis of the conventional charging circuit in the prior art, and can meet the requirement of accelerating the charging speed.

The technical scheme adopted for solving the technical problems is as follows: the circuit comprises a power input module, a PWM module, an output constant voltage and constant current control module, a charging control module and a central control module, wherein the output end of the power input module is connected with the PWM module, the output end of the PWM module is connected with the charging control module, the input end of the output constant voltage and constant current control module is connected with the charging control module, the output end of the output constant voltage and constant current control module is connected with the feedback end of the PWM module, and the central control module is connected with the control end of the charging control module.

The technical scheme adopted by the utility model for solving the technical problems further comprises the following steps:

the power input module adopts a rectifying and filtering module, the rectifying and filtering module comprises a power input interface CON1, a bridge rectifier DB1 and a filter capacitor EC1, the bridge rectifier DB1 is connected with the power input interface CON1, the filter capacitor EC1 is connected to the output end of the bridge rectifier DB1, a fuse F1 is connected to the input line of the power input interface CON1 in series, and a thermistor NTC1 is also connected to the input line of the power input interface CON1 in series.

The rectifying and filtering module further comprises an EMI unit, the EMI unit comprises a capacitor CX1, a resistor R2 and an exciting coil LF1, the capacitor CX1 is connected between the live wire and the zero wire of the power input interface CON1 in a bridging mode, the resistor R1 and the resistor R2 are connected between the live wire and the zero wire of the power input interface CON1 in a series mode, and the exciting coil LF1 is connected on the input wire of the power input interface CON1 in a series mode.

The PWM module comprises a switching power supply chip U1 and an MOS tube Q1, wherein the power end of the switching power supply chip U1 is connected with the positive power end of the power input module, the grid electrode of the MOS tube Q1 is connected with the PWM output end of the switching power supply chip U1, the source electrode of the MOS tube Q1 is grounded, and the drain electrode of the MOS tube Q1 is connected with the positive power end of the power input module.

The positive power end of the power input module is connected with a transformer T1, the output end of the transformer T1 is divided into a main output and an auxiliary output, the main output is connected with a diode D4 in series, and a filter capacitor EC2 is also connected between the positive power end of the main output and the ground; the output of the auxiliary circuit is connected in series with a diode D8, and a filter capacitor EC3 is also connected between the positive power supply end of the output of the auxiliary circuit and the ground.

The output constant voltage and constant current control module comprises a differential amplifier chip U2, wherein the VCC end of the differential amplifier chip U2 is connected with a positive power supply, a capacitor C5 is connected between the positive power supply and the ground, a resistor R29 and a reference voltage stabilizing chip U3 which are connected in series are connected between the positive power supply and the ground, the control end of the reference voltage stabilizing chip U3 is connected with a standard voltage, an IP < 2+ > interface of the differential amplifier chip U2 is connected with one data end of the central control module through a resistor R34 which is connected in series, a resistor R35 is connected between the IP < 2+ > interface of the differential amplifier chip U2 and the ground, a capacitor C9 is connected in parallel with the resistor R35, a capacitor C6 is connected between an OP < 2 > interface of the differential amplifier chip U2 and the IP < 2 > -interface, a resistor R33 and a capacitor C7 which are connected in series are connected in parallel with each other, an OP2 interface of the differential amplifier chip U2 is connected with the cathode of a diode D7 through a resistor R32 which is connected in series, a resistor R36, a light emitting diode of a photoelectric coupler OC1 and a reference voltage stabilizing chip U4 are sequentially connected in series between a positive power supply and the ground, a resistor R37 is connected in parallel with the light emitting diode of the photoelectric coupler OC1, a phototriode of the photoelectric coupler OC1 is connected between the feedback end of the switch power supply chip U1 and the ground, a capacitor C3 is connected in parallel with the phototriode of the photoelectric coupler OC1, a control end of the reference voltage stabilizing chip U4 is connected with one data end of a central control module through a diode D6, a resistor R42 and a resistor R43 which are sequentially connected in series, a resistor R39 is connected between the control end of the reference voltage stabilizing chip U4 and the ground, a resistor R40 and a capacitor C13 are connected in parallel with the resistor R39, a capacitor C14 is connected between the common end of the resistor R42 and the resistor R43 and the ground, a control end of the reference voltage stabilizing chip U4 is connected with a positive power supply output by a main circuit of a transformer T1 through the resistor R38 connected in series, a capacitor C11 is connected between the positive electrode of the reference voltage stabilizing chip U4 and the control end, a resistor R41 and a capacitor C12 which are connected in series are connected in parallel with the capacitor C11, a resistor R31 is connected between a negative power supply output by a main circuit of the transformer T1 and IP 2-of the differential amplifier chip U2, and a capacitor C8 is connected between IP 2-of the differential amplifier chip U2 and the ground.

The charging control module comprises a MOS tube Q2, a triode Q3, a power output interface CON2, a resistor R15, a resistor R16, a resistor R17, a resistor R18 and a capacitor C23, wherein a source electrode of the MOS tube Q2 is connected with a positive power output end of the PWM module, a drain electrode of the MOS tube Q2 is output and connected with the power output interface CON2, the resistor R15 is connected between the source electrode of the MOS tube Q2 and a grid electrode of the MOS tube Q2, the grid electrode of the MOS tube Q2 is connected with a collector electrode of the triode Q3 through the resistor R16, an emitter electrode of the triode Q3 is grounded, a base electrode of the triode Q3 is connected with a data end of the central control module through the resistor R17 which is connected in series, and the capacitor C23 is connected with the resistor R18 in parallel.

The LED lamp comprises an output constant-voltage constant-current control module, wherein the output constant-voltage constant-current control module is connected with a lamp rotating control module, the lamp rotating control module comprises a resistor R19, a double-color LED lamp LED1, a resistor R20, a triode Q4, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a resistor R27, a resistor R28, a diode D5 and a capacitor C10, one end of the resistor R19 is connected with a +5V power supply, the other end of the resistor R19 is connected with the double-color LED lamp LED1, the double-color LED lamp LED1 comprises a red LED lamp and a green LED lamp, the two LED lamps adopt a common anode design, a cathode of the green LED lamp is sequentially connected with a diode D5, a resistor R28, a resistor R27, a resistor R26 and a capacitor C10 in series, the common end of the resistor R27 is connected with the ground, the common end of the resistor R26 is connected with an OP1 pin of a differential amplifier chip U2, the common end of the resistor R26 and the capacitor C10 is connected with the IP1+ pin of the differential amplifier chip U2, the common end of the resistor R28 and the resistor R27 is connected with one end of the resistor R21, the other end of the resistor R22 is connected with the resistor R22 and the resistor R24 in parallel connection with the common end of the resistor R24, the triode Q4 is connected with the common end of the resistor R24 and the resistor R24, and the triode Q2 is connected with the common end of the resistor Q2, and the resistor Q2.

And an LDO power supply module is connected to the auxiliary output of the PWM module, and the LDO power supply module adopts a linear voltage stabilizer U5.

The battery voltage detection unit is connected to the output interface of the charging control module, the battery voltage detection unit comprises a resistor R46, a resistor R47 and a capacitor C21, one end of the resistor R46 is connected with the output interface of the charging control module, the other end of the resistor R46 is connected with one end of the resistor R47, the other end of the resistor R47 is grounded, the capacitor C21 is connected with the resistor R47 in parallel, the common end of the resistor R46 and the resistor R47 is connected with the data end of the central control module, the other data end of the central control module is connected with the temperature detection unit, the temperature detection unit is connected to the output interface of the charging control module, the temperature detection unit comprises a thermistor NTC2, a resistor R49 and a capacitor C24, one end of the thermistor NTC2 is connected with one end of the resistor R49, the other end of the resistor R49 is grounded, the common end of the thermistor R2 and the resistor R49 is connected with the data end of the central control module in parallel, the third data end of the central control module is connected with the reference module in series through the resistor R48, and the third data end of the central control module is connected with the reference module in series.

The beneficial effects of the utility model are as follows: according to the utility model, the charging speed of each stage in the charging process is intelligently controlled, and the charging speed is greatly improved on the premise of ensuring the safety of a charger and a battery.

The utility model will be further described with reference to the drawings and detailed description.

Drawings

Fig. 1 is a block diagram of the circuit of the present utility model.

Fig. 2 is a schematic circuit diagram of a portion of a rectifying and filtering module according to the present utility model.

Fig. 3 is a schematic diagram of a portion of the circuit of the PWM module of the present utility model.

Fig. 4 is a schematic diagram of a part of a circuit of the output constant voltage and constant current control module of the utility model.

Fig. 5 is a schematic circuit diagram of a portion of a turn light control module according to the present utility model.

FIG. 6 is a schematic diagram of a portion of a power module of an LDO according to the present utility model.

Fig. 7 is a schematic circuit diagram of a portion of a charge control module according to the present utility model.

Fig. 8 is a schematic circuit diagram of a portion of a central control module according to the present utility model.

Fig. 9 is a current and voltage line diagram of a conventional charging process.

Fig. 10 is a current and voltage line diagram of the charging process in the charging mode of the present utility model.

Detailed Description

This example is a preferred embodiment of the present utility model, and other principles and basic structures are the same as or similar to those of this example, and all fall within the scope of the present utility model.

Referring to fig. 1 to 8, the utility model mainly comprises a power input module, a PWM module, an output constant voltage and constant current control module, a charging control module and a central control module, wherein the power input module outputs power to the PWM module, the PWM module outputs power to the charging control module, the input end of the output constant voltage and constant current control module is connected with the charging control module, the output end of the output constant voltage and constant current control module is connected with the feedback end of the PWM module, and the central control module is connected with the control end of the charging control module.

In this embodiment, the power input module adopts a rectifying and filtering module for converting the input ac power into dc power, the rectifying and filtering module includes a power input interface CON1, a bridge rectifier DB1 and a filter capacitor EC1, the power input interface CON1 is used for inputting ac power, the bridge rectifier DB1 is connected with the power input interface CON1 for converting the ac power into unidirectional power, and the filter capacitor EC1 is connected to the output end of the bridge rectifier DB1 for converting the rectified unidirectional power into dc power. In this embodiment, a fuse F1 is connected in series to an input line of the power input interface CON1 for overcurrent protection, and a thermistor NTC1 is also connected in series to an input line of the power input interface CON1 for overheat protection of an input end. In this embodiment, the rectifying and filtering module further includes an EMI unit, where the EMI unit includes a capacitor CX1, a resistor R2, and an exciting coil LF1, where the capacitor CX1 is bridged between the live wire and the zero wire of the power input interface CON1, the resistor R1 and the resistor R2 are connected in series between the live wire and the zero wire of the power input interface CON1, and the exciting coil LF1 is connected in series to the input wire of the power input interface CON1, so that EMI interference in the input power can be filtered.

In this embodiment, the PWM module includes a switching power supply chip U1 and a MOS transistor Q1, where a power supply end (i.e., VDD) of the switching power supply chip U1 is connected to a positive power supply end of the power supply input module, a GATE of the MOS transistor Q1 is connected to a PWM output end (i.e., GATE pin) of the switching power supply chip U1, a source of the MOS transistor Q1 is grounded, a drain of the MOS transistor Q1 is connected to a positive power supply end of the power supply input module, and the MOS transistor Q1 is controlled by the PWM chip U1 to perform a high-frequency switching operation, so as to control a current input to the transformer T1 to be converted into a high-frequency alternating current, and perform a voltage conversion. In this embodiment, the output end of the transformer T1 is divided into a main output and an auxiliary output, the main output is connected in series with a diode D4, the main output is rectified to a unidirectional power supply, a filter capacitor EC2 is further connected between the positive power end of the main output and the ground, and the power supply output from the main output is filtered to form a direct current, so as to supply power to the charging control module; the output of the auxiliary circuit is connected in series with a diode D8 to rectify the output of the auxiliary circuit into a unidirectional power supply, a filter capacitor EC3 is also connected between the positive power supply end of the output of the auxiliary circuit and the ground, and the power supply of the output of the main circuit is filtered to form direct current (VCC) to supply power to the utility model.

In this embodiment, the output constant voltage and constant current control module includes a differential amplifier chip U2, a VCC end of the differential amplifier chip U2 is connected with a positive power supply, a capacitor C5 is connected between the positive power supply (VCC) and ground, a resistor R29 and a reference voltage stabilizing chip U3 connected in series are connected between the positive power supply (VCC) and ground, and a control end of the reference voltage stabilizing chip U3 is connected with a standard voltage (Vref). In this embodiment, the IP2+ interface of the differential amplifier chip U2 is connected to one data terminal (P2.3 port, i_pwm) of the central control module through a resistor R34 connected in series, a resistor R35 is connected between the IP2+ interface of the differential amplifier chip U2 and ground, and a capacitor C9 is connected in parallel with the resistor R35. A capacitor C6 is connected between the OP2 interface and the IP 2-interface of the differential amplifier chip U2, a resistor R33 and a capacitor C7 connected in series are connected in parallel with the capacitor C6, and the OP2 interface of the differential amplifier chip U2 is connected with the cathode of the diode D7 through a resistor R32 connected in series. A resistor R36, a light emitting diode of the photo coupler OC1 and a reference voltage stabilizing chip U4 are sequentially connected in series between a positive power supply (VCC) and the ground, a resistor R37 is connected in parallel with the light emitting diode of the photo coupler OC1, a phototransistor of the photo coupler OC1 is connected between a feedback end (namely FB interface) of the switching power supply chip U1 and the ground, a capacitor C3 is connected in parallel with the phototransistor of the photo coupler OC1, a control end of the reference voltage stabilizing chip U4 is connected with one data end (P0.5 port as v_pwm) of the central control module through a diode D6, a resistor R42 and a resistor R43 which are sequentially connected in series, a resistor R39 is connected between the control end of the reference voltage stabilizing chip U4 and the ground, a resistor R40 and a capacitor C13 are connected in parallel with the resistor R39, a control end of the reference voltage stabilizing chip U4 is connected with a positive power supply output by a main circuit of the resistor T1 in series through a resistor R38 and a positive power supply output by a voltage transformer, and a capacitor C11 is connected in parallel with a capacitor C11 between the positive voltage stabilizing chip U4 and the control end of the reference voltage stabilizing chip U4 and the capacitor C11. A resistor R31 is connected between the negative power supply output by the main circuit of the transformer T1 and the IP 2-of the differential amplifier chip U2, and a capacitor C8 is connected between the IP 2-of the differential amplifier chip U2 and the ground. The output voltage and the output current are detected, the differential amplifier is utilized to control the optocoupler to feed back to the primary switching power supply chip U1, and the PWM size is controlled to adjust and achieve the purpose of constant voltage and constant current.

In this embodiment, the charge control module includes a MOS transistor Q2, a triode Q3, a power output interface CON2, a resistor R15, a resistor R16, a resistor R17, a resistor R18 and a capacitor C23, where a source electrode of the MOS transistor Q2 is connected to a positive power output end of the PWM module, a drain electrode output of the MOS transistor Q2 is connected to the power output interface CON2, a resistor R15 is connected between a source electrode of the MOS transistor Q2 and a gate electrode of the MOS transistor Q2, a gate electrode of the MOS transistor Q2 is connected to a collector electrode of the triode Q3 through the resistor R16, an emitter electrode of the triode Q3 is grounded, a base electrode of the triode Q3 is connected to a data end of the central control module through a resistor R17 (in this embodiment, a universal I/O port P0.4 is adopted as an output end of K1), a base electrode of the triode Q3 is grounded through the resistor R18, the capacitor C23 is connected to the resistor R18 in parallel, and the on-off of the triode Q3 is controlled by the central control module, so that the on-off of the MOS transistor Q2 can be used to control the charge/stop. In this embodiment, an exciting coil LF2 is connected in series between the charging control module and the PWM module, and may be used to filter EMI interference at the output end of the charging control module.

In this embodiment, a lamp-turning control module is connected to the output constant-voltage constant-current control module, the lamp-turning control module includes a resistor R19, a dual-color LED lamp LED1, a resistor R20, a triode Q4, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a resistor R27, a resistor R28, a diode D5 and a capacitor C10, wherein the resistor R19 is used as a current limiting resistor, one end is connected with a +5v power supply (i.e., VCC), the other end is connected with the dual-color LED lamp LED1, the dual-color LED lamp LED1 includes a red LED lamp and a green LED lamp, the two LED lamps are designed by adopting a common anode, and in particular implementation, the three-color LED lamp cathode is sequentially connected with a diode D5, a resistor R28, a resistor R27, a resistor R26 and a capacitor C10 in series, and finally connected to ground, a common terminal of the resistor R27 and the resistor R26 is connected with an OP1 pin of a differential amplifier chip U2, a common terminal of the resistor R26 and the capacitor C10 is connected with a differential amplifier chip U2 +pin, a resistor R21 and a common terminal of the resistor R24 are connected with the resistor R24 in parallel with the other end of the resistor R4, and the resistor R24 is connected with the common terminal of the resistor R4 in parallel with the resistor Q4, and the resistor R24 is connected with the common terminal of the resistor R2. After the detected charging current drops to a preset value, the battery is judged to be full, the LED state is controlled to be switched to remind a user of the charging state, the smaller the detected charging current of the lamp turning is, the more the battery is full in charging, but the longer the charging time is, the smaller the set lamp turning current is, and the phenomenon of no lamp turning can be caused.

In this embodiment, the auxiliary output of the PWM module is connected with an LDO power supply module, the LDO power supply module adopts a linear voltage regulator U5, and in this embodiment, the linear voltage regulator U5 adopts a linear voltage regulator chip with a model R1524, and when implemented, the auxiliary output of the PWM module may also be replaced by a linear voltage regulator chip with another model. The auxiliary circuit output voltage of the PWM module can be reduced and stabilized to 3.3V or 5V voltage through the LDO power supply module to supply power to the central control module.

In this embodiment, the central control module adopts a singlechip chip U6 with the model MT006, and may be replaced by other types of singlechip chips when implemented. The central control module has one data end (in this embodiment, the common port P1.5 is selected as the common I/O port P1.5, with the ADC function, if the single-chip microcomputer without the ADC function is selected, an analog-to-digital conversion module is needed), the battery voltage detection unit is connected to the output interface of the charging control module, the battery voltage detection unit includes a resistor R46, a resistor R47 and a capacitor C21, one end of the resistor R46 is connected to the output interface of the charging control module, the other end of the resistor R46 is connected to one end of the resistor R47, the other end of the resistor R47 is grounded, the capacitor C21 is connected in parallel with the resistor R47, the common port of the resistor R46 and the resistor R47 is connected to the data end of the central control module, the other data end (in this embodiment, the common I/O port P1.6 is selected as the common port P4, with the ADC function is selected, if the single-chip microcomputer without the ADC function is selected, an analog-to-digital conversion module is needed), the temperature detection unit is connected to the output interface of the charging control module, the temperature detection unit is connected to the other end of the charging control module, the resistor R46 is connected to the output interface of the charging control module, one end of the resistor R4 is connected to the common port P4, the common port P4 is connected to the common port P4, and the common port P4 is connected to the common port P1.6, and the common port is connected to the common port P6, with the common port is selected as the common port, with the common port P4, with the common port is connected to the common port, with the common port is. An analog-to-digital conversion module is needed to be added), the third data terminal (in this embodiment, the data terminal connected with the resistor R48) of the central control module is connected with the reference voltage (i.e. Vref) through the resistor R48 connected in series, and a capacitor C22 is connected in series between the third data terminal and the ground. The central control module can be used for collecting peripheral information and controlling peripheral circuits.

When the utility model is used, after alternating current is input, the alternating current is fed to the PWM module through the rectifying and filtering module, a constant-current constant-voltage power supply is output through PWM and transformer conversion, the central control module monitors the temperature of the device with the highest temperature in real time through the NTC2, and the constant-current sampling reference voltage of the comparator is changed through PWM to control the output constant-current value; meanwhile, the central control module monitors the voltage of the output port of the charger, when the voltage of the battery is required to be detected, the MOS tube of the charging control module can be controlled to stop charging, the charging current is 0A at the moment, the voltage deviation caused by line loss is eliminated, and the charging can be recovered after the voltage of the battery is rapidly detected; the central control module changes the constant voltage value of the charger in a small amplitude through the other path of PWM to reach the required control curve.

Referring to fig. 9 and 10 in combination, the present utility model may be used to compare the charging process of a conventional charger.

The conventional charger charging process is as follows:

1. the conventional charging mode is that when the commercial power is just connected, the charger charges the battery with rated current and constant current, at the moment, the temperature of each device of the charger is slowly increased from low temperature, the temperature rising speed of each part of the charger is slowed down approximately after charging for 1 hour, and after charging for 2 hours, the temperature of each part of the charger tends to be stable and does not rise any more, so as to reach stable charging temperature, at the moment, the time T1 in the attached figure 9 is reached;

2. when the battery voltage is gradually increased to the vicinity of the voltage stabilizing point of the charger after the time T1 is charged, and the voltage difference between the battery voltage and the charger is smaller and smaller when the charging is continued after the time T1, the charging current is automatically gradually reduced until the charging current is smaller than a set turning-lamp current point, at the moment, the time T2 in the attached figure 9 is reached, an orange/red lamp is turned into a green/blue lamp, a user is reminded that the battery is full, the process of T1-T2 is very slow, particularly when the setting of the turning-lamp point is smaller, the process of T1-T2 is even longer than the time 0-T1, and the charging speed is seriously influenced.

The charging process of the utility model is as follows:

1. in order to increase the charging speed, when the mains supply is just connected and the temperature of the charger is detected to be very low (usually room temperature), an over-power charging mode (rated power which is 1.2-1.5 times that of the charger is adopted, and the rated power is set according to different details of the charger and is usually the rated power of the charger); although the temperature of the charger device rises faster due to the over-power charging, the central control module is adopted to monitor the temperature of the device, and the charging power is reduced to the rated power before the temperature rating of the charger (in the embodiment, the temperature rating is set to 100 ℃), at this time, the time point is T1 in FIG. 10, the temperature of each device of the charger is maintained at the rated working temperature, and the charging speed is greatly improved in the process;

2. when the battery voltage approaches the no-load charger voltage (in this embodiment, the voltage is not fixed, and is determined according to the length of the wire, the internal resistance of the device, etc., 0.3V is usually selected, that is, when the voltage difference between the battery voltage and the no-load charger is less than or equal to 0.3V, it may be determined that the battery voltage approaches the no-load charger voltage), and the charging current begins to decrease slowly from the constant current value, which is the time point T2 in fig. 10, after the charging reaches the time point T2, the central control module begins to monitor the charging current, and when the current drops to about 80% of the constant current point, the time point T3 is reached;

3. after reaching the time T3, the central control module controls the constant current point to be 0.8 times of the rated current for constant current charging, and controls the constant voltage of the charger to be raised, so that the charger and the battery keep a certain pressure difference (in the embodiment, the pressure difference is automatically regulated, the current at the moment is kept not to be reduced, the pressure difference is related to the internal resistance of the battery, the internal resistance of a wire and the like, and usually 0.1V-1.0V is normal), until the battery voltage reaches a set value (the battery voltage and the port voltage detected after the output of the charger are normal, due to the pressure difference of factors such as a connecting wire, the detected battery voltage has deviation in the charging process, the charging needs to be stopped briefly by the central control module in the charging process, the charging current is reduced to 0A at the moment, the pressure difference of the connecting wire is eliminated, the central control module immediately resumes the charging after rapidly detecting the voltage on the battery, and the voltage at the moment of the battery can be tested more accurately, at the moment T4 in the embodiment, the charging is stopped for 2 seconds, so that the charging current is reduced to 0A, if the charging needs to be stopped for a plurality of times, the power failure frequency is 1 minute;

4. at this time, at the time of T4, the charging speed is increased at the time of T3-T4, after the time of T4 is reached, the central control module controls the constant voltage value of the charger to drop and restore to the normal value (namely the set charging voltage value), at this time, the voltage difference between the charger and the battery is extremely small, the charging current can drop to the turning lamp current point rapidly, at the moment, at the time of T5 in FIG. 10, therefore, the process of T4-T5 is extremely short, and the charging speed can be greatly shortened in this way.

Compared with the optimization of the charging curve, the utility model can greatly utilize the energy of the charger, improve the charging speed of the charger on the premise of not increasing the cost, and greatly improve the cost performance and the competitiveness of the product.

According to the utility model, the charging speed of each stage in the charging process is intelligently controlled, and the charging speed is greatly improved on the premise of ensuring the safety of a charger and a battery.

Claims

1. An accelerated charging circuit, characterized by: the circuit comprises a power input module, a PWM module, an output constant voltage and constant current control module, a charging control module and a central control module, wherein the output end of the power input module is connected with the PWM module, the output end of the PWM module is connected with the charging control module, the input end of the output constant voltage and constant current control module is connected with the charging control module, the output end of the output constant voltage and constant current control module is connected with the feedback end of the PWM module, and the central control module is connected with the control end of the charging control module.

2. The accelerated charging circuit of claim 1 wherein: the power input module adopts a rectifying and filtering module, the rectifying and filtering module comprises a power input interface CON1, a bridge rectifier DB1 and a filter capacitor EC1, the bridge rectifier DB1 is connected with the power input interface CON1, the filter capacitor EC1 is connected to the output end of the bridge rectifier DB1, a fuse F1 is connected to the input line of the power input interface CON1 in series, and a thermistor NTC1 is also connected to the input line of the power input interface CON1 in series.

3. The acceleration charging circuit of claim 2, wherein: the rectifying and filtering module further comprises an EMI unit, the EMI unit comprises a capacitor CX1, a resistor R2 and an exciting coil LF1, the capacitor CX1 is connected between the live wire and the zero wire of the power input interface CON1 in a bridging mode, the resistor R1 and the resistor R2 are connected between the live wire and the zero wire of the power input interface CON1 in a series mode, and the exciting coil LF1 is connected on the input wire of the power input interface CON1 in a series mode.

4. The accelerated charging circuit of claim 1 wherein: the PWM module comprises a switching power supply chip U1 and an MOS tube Q1, wherein the power end of the switching power supply chip U1 is connected with the positive power end of the power input module, the grid electrode of the MOS tube Q1 is connected with the PWM output end of the switching power supply chip U1, the source electrode of the MOS tube Q1 is grounded, and the drain electrode of the MOS tube Q1 is connected with the positive power end of the power input module.

5. The accelerated charging circuit of claim 1 wherein: the positive power end of the power input module is connected with a transformer T1, the output end of the transformer T1 is divided into a main output and an auxiliary output, the main output is connected with a diode D4 in series, and a filter capacitor EC2 is also connected between the positive power end of the main output and the ground; the output of the auxiliary circuit is connected in series with a diode D8, and a filter capacitor EC3 is also connected between the positive power supply end of the output of the auxiliary circuit and the ground.

6. The accelerated charging circuit of claim 1 wherein: the output constant voltage and constant current control module comprises a differential amplifier chip U2, wherein the VCC end of the differential amplifier chip U2 is connected with a positive power supply, a capacitor C5 is connected between the positive power supply and the ground, a resistor R29 and a reference voltage stabilizing chip U3 which are connected in series are connected between the positive power supply and the ground, the control end of the reference voltage stabilizing chip U3 is connected with a standard voltage, an IP < 2+ > interface of the differential amplifier chip U2 is connected with one data end of the central control module through a resistor R34 which is connected in series, a resistor R35 is connected between the IP < 2+ > interface of the differential amplifier chip U2 and the ground, a capacitor C9 is connected in parallel with the resistor R35, a capacitor C6 is connected between an OP < 2 > interface of the differential amplifier chip U2 and the IP < 2 > -interface, a resistor R33 and a capacitor C7 which are connected in series are connected in parallel with each other, an OP2 interface of the differential amplifier chip U2 is connected with the cathode of a diode D7 through a resistor R32 which is connected in series, a resistor R36, a light emitting diode of a photoelectric coupler OC1 and a reference voltage stabilizing chip U4 are sequentially connected in series between a positive power supply and the ground, a resistor R37 is connected in parallel with the light emitting diode of the photoelectric coupler OC1, a phototriode of the photoelectric coupler OC1 is connected between the feedback end of the switch power supply chip U1 and the ground, a capacitor C3 is connected in parallel with the phototriode of the photoelectric coupler OC1, a control end of the reference voltage stabilizing chip U4 is connected with one data end of a central control module through a diode D6, a resistor R42 and a resistor R43 which are sequentially connected in series, a resistor R39 is connected between the control end of the reference voltage stabilizing chip U4 and the ground, a resistor R40 and a capacitor C13 are connected in parallel with the resistor R39, a capacitor C14 is connected between the common end of the resistor R42 and the resistor R43 and the ground, a control end of the reference voltage stabilizing chip U4 is connected with a positive power supply output by a main circuit of a transformer T1 through the resistor R38 connected in series, a capacitor C11 is connected between the positive electrode of the reference voltage stabilizing chip U4 and the control end, a resistor R41 and a capacitor C12 which are connected in series are connected in parallel with the capacitor C11, a resistor R31 is connected between a negative power supply output by a main circuit of the transformer T1 and IP 2-of the differential amplifier chip U2, and a capacitor C8 is connected between IP 2-of the differential amplifier chip U2 and the ground.

7. The accelerated charging circuit of claim 1 wherein: the charging control module comprises a MOS tube Q2, a triode Q3, a power output interface CON2, a resistor R15, a resistor R16, a resistor R17, a resistor R18 and a capacitor C23, wherein a source electrode of the MOS tube Q2 is connected with a positive power output end of the PWM module, a drain electrode of the MOS tube Q2 is output and connected with the power output interface CON2, the resistor R15 is connected between the source electrode of the MOS tube Q2 and a grid electrode of the MOS tube Q2, the grid electrode of the MOS tube Q2 is connected with a collector electrode of the triode Q3 through the resistor R16, an emitter electrode of the triode Q3 is grounded, a base electrode of the triode Q3 is connected with a data end of the central control module through the resistor R17 which is connected in series, and the capacitor C23 is connected with the resistor R18 in parallel.

8. The accelerated charging circuit of claim 1 wherein: the LED lamp comprises an output constant-voltage constant-current control module, wherein the output constant-voltage constant-current control module is connected with a lamp rotating control module, the lamp rotating control module comprises a resistor R19, a double-color LED lamp LED1, a resistor R20, a triode Q4, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a resistor R27, a resistor R28, a diode D5 and a capacitor C10, one end of the resistor R19 is connected with a +5V power supply, the other end of the resistor R19 is connected with the double-color LED lamp LED1, the double-color LED lamp LED1 comprises a red LED lamp and a green LED lamp, the two LED lamps adopt a common anode design, a cathode of the green LED lamp is sequentially connected with a diode D5, a resistor R28, a resistor R27, a resistor R26 and a capacitor C10 in series, the common end of the resistor R27 is connected with the ground, the common end of the resistor R26 is connected with an OP1 pin of a differential amplifier chip U2, the common end of the resistor R26 and the capacitor C10 is connected with the IP1+ pin of the differential amplifier chip U2, the common end of the resistor R28 and the resistor R27 is connected with one end of the resistor R21, the other end of the resistor R22 is connected with the resistor R22 and the resistor R24 in parallel connection with the common end of the resistor R24, the triode Q4 is connected with the common end of the resistor R24 and the resistor R24, and the triode Q2 is connected with the common end of the resistor Q2, and the resistor Q2.

9. The accelerated charging circuit of claim 1 wherein: and an LDO power supply module is connected to the auxiliary output of the PWM module, and the LDO power supply module adopts a linear voltage stabilizer U5.

10. The accelerated charging circuit of claim 1 wherein: the battery voltage detection unit is connected to the output interface of the charging control module, the battery voltage detection unit comprises a resistor R46, a resistor R47 and a capacitor C21, one end of the resistor R46 is connected with the output interface of the charging control module, the other end of the resistor R46 is connected with one end of the resistor R47, the other end of the resistor R47 is grounded, the capacitor C21 is connected with the resistor R47 in parallel, the common end of the resistor R46 and the resistor R47 is connected with the data end of the central control module, the other data end of the central control module is connected with the temperature detection unit, the temperature detection unit is connected to the output interface of the charging control module, the temperature detection unit comprises a thermistor NTC2, a resistor R49 and a capacitor C24, one end of the thermistor NTC2 is connected with one end of the resistor R49, the other end of the resistor R49 is grounded, the common end of the thermistor R2 and the resistor R49 is connected with the data end of the central control module in parallel, the third data end of the central control module is connected with the reference module in series through the resistor R48, and the third data end of the central control module is connected with the reference module in series.