CN212518501U

CN212518501U - Charging control circuit

Info

Publication number: CN212518501U
Application number: CN202020684570.8U
Authority: CN
Inventors: 杨芹; 胡伍仔
Original assignee: Jin Xin Yu Power Shenzhen Supply Co ltd
Current assignee: Jin Xin Yu Power Shenzhen Supply Co ltd
Priority date: 2020-04-28
Filing date: 2020-04-28
Publication date: 2021-02-09
Anticipated expiration: 2030-04-28

Abstract

The utility model relates to the technical field of charging, in particular to a charging control circuit, which comprises a main control circuit and a main power circuit; the main power supply circuit comprises a switch module and a main charging module, and the main control circuit comprises a main control MCU, an output voltage detection module, a current detection control module and a voltage stabilization power supply module; the output voltage detection module is used for detecting the output voltage value of the main charging module and feeding back the output voltage value to the main control MCU, the current detection control module is used for detecting the output current value of the main charging module and feeding back the output current value to the main control MCU, the main control MCU controls the switch module to be switched on or off and controls the magnitude of the charging voltage and current according to the obtained detection result, and the switching-on and switching-off of the switch module respectively control the main charging module to carry out or stop the charging work. The utility model provides a pair of charging control circuit, the size of ability automatically regulated charging voltage can protect the battery.

Description

Charging control circuit

Technical Field

The utility model belongs to the technical field of the technique of charging and specifically relates to indicate a charge control circuit.

Background

With the continuous development and progress of human society, the influence of several commonly used batteries such as nickel-metal hydride batteries, lithium batteries and the like in the life of people is larger and larger, how to better apply the batteries and better protect the batteries is more and more aroused attention of people, battery charging is an important link for protecting the batteries, so the selection and application of a charger of the batteries very influence the performance of the batteries, the traditional battery charger circuit is simpler in design, a constant-current constant-voltage circuit or direct constant voltage is adopted for charging the batteries, the anti-interference capability is poor, the protection of the batteries in the charging process is imperfect, the service life of the batteries is further shortened, the use of terminal equipment is influenced, and even consumers are injured in serious cases, and the influence of the quality of the charger on the batteries and equipment with the batteries is huge.

Disclosure of Invention

The utility model discloses problem to prior art provides a charge control circuit, can acquire the real-time voltage of battery charging outfit when battery charging outfit charges to according to battery charging outfit's voltage size automatically regulated charging voltage's size, and can charge or stop charging for battery charging outfit by automatic control, and then can protect the battery.

In order to solve the technical problem, the utility model discloses a following technical scheme: a charging control circuit comprises a main control circuit and a main power supply circuit; the main power supply circuit comprises a switch module and a main charging module, and the main control circuit comprises a main control MCU, an output voltage detection module, a current detection control module and a voltage stabilization power supply module; the input end and the output end of the main charging module are respectively connected with a power supply and charging equipment, the output voltage of the main charging module is connected with the input end of the switch module after passing through the charging equipment, the output end of the switch module is a detection point of voltage and current, and the control end of the switch module is connected with a main control MCU (microprogrammed control unit); the output voltage detection module is used for detecting the output voltage value of the main charging module and feeding back the detection result to the main control MCU, the current detection control module is used for detecting the output current value of the main charging module and feeding back the detection result to the main control MCU, the main control MCU controls the switch module to be switched on or switched off and controls the magnitude of the charging voltage and current according to the obtained detection result, the switch module is switched on and switched off to respectively control the main charging module to perform or stop charging work, and the power supply end of the main control MCU and the power supply end of the current detection control module are both connected with the output end of the voltage-stabilizing power supply module.

Preferably, the switch module includes a switch tube Q3, a switch tube Q4, a resistor RM1 and a resistor RM2, control ends of the switch tube Q3 and the switch tube Q4 are both connected to the main control MCU, a first switch end of the switch tube Q3 is connected to a first switch end of the switch tube Q4, a second switch end of the switch tube Q3 is connected to an input end of the current detection control module, a second switch end of the switch tube Q4 is connected to the charging device, a second switch end of the switch tube Q3 is grounded via the resistor RM1, and the resistor RM2 is connected to the resistor RM1 in parallel.

Preferably, the main charging module comprises a state prompting unit, and a control end of the state prompting unit is connected with the main control MCU.

Preferably, the state prompting unit comprises a light emitting diode LED-R, a light emitting diode LED-G, a light emitting diode LED-B, a resistor RS15, a resistor RS17 and a resistor RS21, cathodes of the light emitting diode LED-R, the light emitting diode LED-G and the light emitting diode LED-B are all connected with the master control MCU, an anode of the light emitting diode LED-R is connected with the power supply voltage through the resistor RS15, an anode of the light emitting diode LED-G is connected with the power supply voltage through the resistor RS17, and an anode of the light emitting diode LED-B is connected with the power supply voltage through the resistor RS 21.

Preferably, the output voltage detection module includes a first voltage detection unit and a second voltage detection unit, the first voltage detection unit is used for detecting a voltage value of the charging device and inputting the detected voltage value into the main control MCU, the second voltage detection unit is used for detecting a lower limit voltage of the charging device and inputting the detected lower limit voltage value into the main control MCU, and the main control MCU controls the switching on or off of the switch module and controls the magnitude of the charging voltage and current according to the received voltage value.

Preferably, the first voltage detection unit includes a resistor R6 and a resistor R7, an output end of the main charging module is connected to an output end of the switch module after sequentially passing through a resistor R6 and a resistor R7, and a connection end of the resistor R6 and the resistor R7 is connected to the main control MCU; the second voltage detection unit comprises a resistor R2 and a resistor R3, the output end of the main charging module is connected with the output end of the switch module after sequentially passing through a resistor R2 and a resistor R3, and the connecting sections of the resistor R2 and the resistor R3 are connected with the main control MCU.

Preferably, the main charging module further comprises a primary power supply unit and a secondary power supply unit, wherein an input end of the primary power supply unit is connected with a power supply; the current detection main control circuit comprises a current detection amplifying unit, a voltage stabilizing unit and a current adjusting unit; the input end of the voltage stabilizing unit is connected with the output end of the primary power supply unit, and the output end of the voltage stabilizing unit is connected with the input end of the voltage stabilizing power supply module; the input end of the current adjusting unit is connected with the output end of the switch module, the current adjusting unit is used for controlling and adjusting the output current of the main charging module, and the output end of the current adjusting unit and the output end of the voltage stabilizing unit are both connected with the output end of the secondary power supply unit; the input end of the current detection amplifying unit is connected with the output end of the switch module, the current detection amplifying unit amplifies the received current and then inputs the amplified current into the main control MCU, and the main control MCU controls the magnitude of the pre-charging current output to the charging equipment according to the received amplified current.

Preferably, the current adjusting unit includes a first operational amplifier X1, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a resistor R28, and a switch tube Q1, an inverting input terminal of the first operational amplifier X1 is connected to an output terminal of the switch module, a resistor R20 and a diode D4 are disposed between an output terminal of the first operational amplifier X1 and an output terminal of the secondary power supply unit, a non-inverting input terminal of the first operational amplifier X1 is grounded via a resistor R28, a resistor R26, and a switch end of the switch tube Q1 in sequence, and a control end of the switch tube Q1 is connected to the MCU; the voltage stabilizing unit comprises a second operational amplifier X2, the inverting input end of the second operational amplifier X2 is connected with the output end of the primary power supply unit, the non-inverting input end of the second operational amplifier X2 is grounded after sequentially passing through a resistor R23 and a resistor R24, a resistor R25 is connected with a resistor R24 in parallel, one end of the resistor R22 is connected with the non-inverting input end of the second operational amplifier X2, the other end of the resistor R22 is connected with the input end of the voltage stabilizing power supply module, and a resistor R21 and a diode D3 are arranged between the output end of the second operational amplifier X2 and the output end of the secondary power supply unit.

Preferably, the current detection amplifying unit includes a third operational amplifier U3 and a current amplification factor adjusting part, an input terminal of the third operational amplifier U3 is connected to an output terminal of the switch module, an output terminal of the third operational amplifier U3 is connected to the main control MCU, and the current amplification factor adjusting part is configured to adjust a current amplification factor of the third operational amplifier U3.

Preferably, the primary power supply unit includes a primary side power supply unit, a high frequency switch transformer, a primary side PWM control unit, and a first rectifying and filtering unit, wherein a power supply voltage is input via the primary side power supply unit, and then input to the first rectifying and filtering unit after being stepped down via the primary side PWM control unit and the high frequency switch transformer, and the first rectifying and filtering unit rectifies and filters an input voltage and outputs the rectified and filtered voltage to the charging device; the secondary power supply unit comprises a second rectifying and filtering unit and a resistor RS12, and the input voltage of the secondary power supply unit is rectified and filtered by the second rectifying and filtering unit and then is connected with the output end of the current regulating unit and the output end of the voltage stabilizing unit through the resistor RS 12.

The utility model has the advantages that:

the utility model provides a pair of charging control circuit, through the condition of output voltage detection module and current detection control module real-time detection battery charging outfit's voltage and electric current, master control MCU is again according to battery charging outfit's voltage and current condition control switch module the on-off and main power source circuit's output voltage and output current's size. This charging control circuit can differentiate voltage status, the connection status that detects battery charging outfit automatically, and the testing result gets into preset state work after normal, and disconnection output stops charging when unusual, and the interference killing feature is strong to reach the purpose of independently controlling the charging process, the battery charging outfit is protected in the charging process that can be better, and then increases battery charging outfit's life.

Drawings

Fig. 1 is a circuit block diagram of the present invention.

Fig. 2 is a schematic diagram of the main control circuit of the present invention.

Fig. 3 is a schematic diagram of the main power circuit of the present invention.

The reference numerals in fig. 1 to 3 include:

the power supply control circuit comprises a 1-switch module, a 2-main charging module, a 3-output voltage detection module, a 4-current detection control module, a 5-voltage stabilization power supply module, a 6-state prompting unit, a 7-primary power supply unit, an 8-secondary power supply unit, a 9-current detection amplification unit, a 10-voltage stabilization unit and a 11-current regulation unit.

Detailed Description

In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention. The present invention will be described in detail with reference to the accompanying drawings.

A charging control circuit provided in this embodiment, as shown in fig. 1, includes a main control circuit and a main power supply circuit; the main power supply circuit comprises a switch module 1 and a main charging module 2, and the main control circuit comprises a main control MCU, an output voltage detection module 3, a current detection control module 4 and a voltage-stabilizing power supply module 5; the input end and the output end of the main charging module 2 are respectively connected with a power supply and charging equipment, the output voltage of the main charging module 2 is connected with the input end of the switch module 1 after passing through the charging equipment, the output end of the switch module 1 is a detection point of voltage and current, and the control end of the switch module 1 is connected with a main control MCU (microprogrammed control unit); the output voltage detection module 3 is used for detecting the output voltage value of the main charging module 2 and feeding back the detection result to the main control MCU, the current detection control module 4 is used for detecting the output current value of the main charging module 2 and feeding back the detection result to the main control MCU, the main control MCU controls the switch module 1 to be switched on or switched off and controls the magnitude of the charging voltage and current according to the obtained detection result, the switch module 1 is switched on and switched off to respectively control the charging work of the main charging module 2 to be carried out or stopped, and the power supply end of the main control MCU and the power supply end of the current detection control module 4 are both connected with the output end of the voltage-stabilizing power supply module 5.

Specifically, the main control MCU is a controller in the prior art, such as a single chip microcomputer. The voltage and current conditions of the charging equipment are detected in real time through the output voltage detection module 3 and the current detection control module 4, and the main control MCU controls the on and off of the switch module 1 and the output voltage and the output current of the main power supply circuit according to the voltage and current conditions of the charging equipment. This charging control circuit can differentiate voltage status, the connection status that detects battery charging outfit automatically, and the testing result gets into preset state work after normal, and disconnection output stops charging when unusual, and the interference killing feature is strong to reach the purpose of independently controlling the charging process, the battery charging outfit is protected in the charging process that can be better, and then increases battery charging outfit's life.

The connection principle of the main control MCU of the output voltage detection module 3 of this embodiment is shown in fig. 2, the main charging module 2 and the switch module 1 are shown in fig. 3, J1 in fig. 2 and CON2 in fig. 3 are connection terminals, and pins thereof are connected in a one-to-one correspondence; after the power supply is connected and the charging equipment enters a working state, the voltage on the charging equipment is obtained through a resistor R6 and a resistor R7 of an output voltage detection module 3, when the ground level of a resistor R7 is 2.707V, the main control MCU controls a main power circuit to enter a normal charging state, and when the voltage of a resistor R7 is detected to be too low, the main control MCU controls a switch module 1 to be switched off, so that the output of a main charging module 2 is cut off; the charging lower limit voltage of the charging device is detected by the resistor R2 and the resistor R3 of the output voltage detection module 3, and the voltage on the resistor R3 is fed back to the main control MCU, and the main control MCU controls the output voltage of the main charging module 2 according to the fed-back voltage.

The current detection control module 4 includes a current detection amplifying unit 9, a voltage stabilizing unit 10, and a current adjusting unit 11, which are connected to the main control MCU, the main charging module 2, and the switch module 1 through circuits as shown in fig. 3, wherein a second operational amplifier X2 of the voltage stabilizing unit 10 and a first operational amplifier X1 of the current adjusting unit 11 actually employ a chip AP4310 with dual operational amplifiers, but not limited to the chip AP4310, and a reference voltage source is provided inside the chip AP4310, so that the number of components can be reduced, the process can be reduced, and the cost can be saved. In fig. 2, the resistor R19, the capacitor C10, the capacitor C11, and the capacitor C16 constitute a loop compensation circuit of the second operational amplifier X2, the resistor R18, the capacitor C8, and the capacitor C9 constitute a loop compensation circuit of the first operational amplifier X1, and the capacitor C12, the capacitor C13, and the capacitor C14 are interference suppression elements. The current detection amplifying unit 9 preferably employs a chip TLV8811, and the current detection signal is output to the main control MCU after being compared and amplified by the third operational amplifier in the TLV8811, and then the change of the current output to the charging device is controlled by the main control MCU, wherein the signal amplification factor of the third operational amplifier is changed by adjusting the current amplification factor adjusting part, i.e., adjusting the resistance values of the resistor R11, the resistor R12, the resistor R14, and the resistor R15.

The main charging module 2 includes a primary power unit 7, a secondary power unit 8, and a status prompt unit 6, which are connected to the switch module 1 and the main control MCU as shown in fig. 3, the primary side power circuit, the high frequency switch transformation unit, and the primary side PWM control unit all adopt the prior art, a rectifier diode DS1 in the first rectifier filter unit rectifies an input signal, a capacitor CS1 and a capacitor CS2 filter the signal, a resistor RS1 and a capacitor RS2 are high frequency interference filter circuits, a zener diode ZD3 is an overvoltage protection element, the input signal obtains an output voltage VOUT + after passing through the first rectifier filter unit, the output voltage VOUT + passes through an output load, i.e., a charging device, and is connected to a B-terminal of the switch module 1, a current at the B-terminal passes through a switch tube Q4 and a switch tube Q3 of the switch module 1 and reaches a PGND terminal, and the PGND terminal is a current detection point. After the signal is transformed by the secondary winding of the secondary power supply unit 8, the current of the signal is limited and rectified by the resistor RS9 and the rectifier diode DS3 of the second rectifying and filtering unit, and then the signal is filtered by the capacitor CS3 to output a direct current voltage, and the direct current voltage is input to the pin15 and the pin1 of the connection terminal CON 2. The state prompt unit 6 comprises a red light emitting diode LED-R, a green light emitting diode LED-G and a blue light emitting diode LED-B, and the main control MCU controls the light emitting diodes of the three colors to make different lighting states according to the charging state.

The actual charging operation principle of the charging control circuit of the present embodiment is as follows:

the AC voltage passes through a primary side power circuit, is subjected to voltage reduction through a primary side PWM control circuit and a high-frequency switch transformation circuit, is rectified through a rectifier diode DS1, is filtered through a capacitor CS1 and a capacitor CS2, is subjected to high-frequency interference filtering through a resistor RS1 and a resistor RS2 and is subjected to overvoltage protection through a voltage regulator diode ZD3 to obtain output voltage VOUT +, VOUT + passes through a charging device and is connected with a B-end of a switch module 1, current of the B-end passes through a switch tube Q4 and a switch tube Q3 and then flows to a PGND end, and then flows to GND through a resistor RM1 and a resistor RM2, and the output voltage VOUT + is a main current loop of a main charging. An output voltage VOUT + sequentially passes through an adjustable resistor RS4, a resistor RS6, a resistor RS5 and a resistor RS11 and then is connected to a PIN16 PIN of a CON2, a PIN16 PIN is connected to a PIN2 of a chip U4 in the chip U4 through a terminal J1 in the chip U2, namely, an inverting input end of a second operational amplifier X2 in the chip U4, the internal reference voltage of the chip U4 is 2.5V, and the PIN2 of the chip U4 is compared with the reference voltage of the PIN3 of the chip U4, so that a high-low level signal is output; in fig. 3, after the signal is transformed by the auxiliary winding of the secondary power supply unit 8, the signal passes through the resistor RS9 and the current-limiting rectification of the rectifying diode DS3, and then is filtered by the capacitor CS3 to output a dc voltage, the output dc voltage is divided into two paths of signals, one path of the output dc voltage passes through the current-limiting of the resistor RS12 and then is input to the PIN15 of the CON2, the PIN15 of the CON2 is connected to the PIN15 of the terminal J1, and then the signal is connected to the PIN1 and the PIN 7 of the chip U4 through the diode D2, the resistor R21 and the resistor R20, and then the PIN2 and the PIN3 of the chip U4 compare the amplified signal with the signal of the PIN1 of the chip U4 and output a; after another path of signal of the dc voltage output by the secondary electric unit is connected to PIN1 of J1 in fig. 2 through PIN1 of CON2 in fig. 3, PIN1 of J1 is connected to PIN 8 of U4 to provide the supply voltage for U4, PIN1 of J1 is input to LDO regulated power supply module 5 composed of capacitor C1, regulated chip U1, resistor R31 and capacitor C2 in fig. 2, and regulated output 3.3V provides the supply voltage for the main control MCU and chip U3.

The current detection point PGND is shown in fig. 3, and PGND is connected to PIN3 of J1 in fig. 2 through PIN3 of CON2 in fig. 3, and after the main charging module 2 is connected to the load, it detects the level drop across resistor RM1 and resistor RM2, and after this detected current signal is converted into a level signal, it reaches PIN3 of J1 in fig. 2, PIN3 of J1 passes through resistor R29, and resistor R27 passes through PIN 6 of U4 in fig. 2, and after the voltage signal of PIN 6 is compared and amplified with the reference level signal of PIN5 (2.5V reference voltage is a level divided by resistor R23, resistor R24, and resistor R25), and after comparison, it is compared and amplified with PIN15 of J1, diode D2, resistor R20, resistor R18, capacitor C8, capacitor C9, resistor R24, resistor R25, resistor R23, resistor R22, and resistor R28, etc. to control the output current. Meanwhile, a PIN13 PIN of the J1 flows to a PIN3 PIN of the U3 in fig. 2 through a resistor R10, a PIN3 PIN of the U3 and a PIN4 PIN of the U3 are compared and amplified, and then an output voltage signal flows into a PIN20 PIN of the main control MCU in fig. 2 through a resistor R12, a resistor R13 and a capacitor C6, and the size of the output precharge current is controlled by the main control MCU. The amplification factor is set by a resistor R11, a resistor R12, a resistor R14 and a resistor R15.

When the power is input into the main charging module 2, the main circuit starts to operate, and establishes the output voltage VOUT +, and in the idle state of the power, the output voltage VOUT + is connected to PIN5 of J1 in fig. 2 through PIN5 of CON2 in fig. 3, and is connected to PIN 19 of the MCU after being divided by resistor R6 and resistor R7 in fig. 2, and the MCU starts to detect the output voltage VOUT + by dividing the voltage across resistor R7. Actually, the voltage of the theoretical rated voltage above the resistor R7 is 2.707V through calculation of the required output voltage, the voltage value of the resistor R7 starts to be detected when the output voltage VOUT + of the actual main charging module 2 is idle, then the main control MCU controls the light emitting diode LED-B to light (hereinafter referred to as a blue light), the light emitting diode LED-R (hereinafter referred to as a red light) and the light emitting diode LED-G (hereinafter referred to as a green light) to alternately flash, the power-on detection is performed for 4 times, when the voltage of the resistor R7 is detected to be around 2.707V, the MCU determines that the output voltage is normal (2.707V is usually set to be a 5% error range, which just corresponds to a 5% error in the output voltage range, the 5% error range can be changed and set by the main control MCU according to actual conditions), when the 5% error range of the set value is normal, the main control MCU sends a signal to control the switching tube Q3 and the switching tube Q4, at the moment, the blue lamp is on, the green lamp is on, the red lamp is off, and the output voltage is equal to the voltage of the charging equipment after the charging equipment is connected. If the detected voltage is not within the range of + -5% of the range 2.707V, the blue light is flashed, the green light is turned off, and the red light is turned off. The main control MCU outputs a control signal through a PIN10, controls the on-off of a switch tube Q2 after passing through a resistor R8, and controls the on-off of a switch tube Q2, wherein a switch end of the switch tube Q2 is connected with a PIN4 of a CON2 in the picture 3 through a PIN4 PIN of a J1, so that the on-off of the switch tube 3 and the switch tube Q4 is controlled;

PINs

15, 16 and 17 of the main control MCU in fig. 2 are respectively connected with PINs 11, PINs 10 and PINs 9 of the CON2 in fig. 3 through PINs 11, PINs 10 and PINs 9 of the J1, and correspond to the operating states of a blue lamp, a green lamp and a red lamp, and the resistors RS21, RS17 and RS15 are current limiting resistors. When the voltage detection of the pin 19 of the main control MCU in fig. 2 is in the range of 1.41-2.02V after the charging device is connected, the charging device starts to be charged with a small current, and when the rated voltage is 2.707V, that is, the battery voltage is lower than 74% of the rated set value, the charging device is charged with a small current; when the voltage of the charging device is greater than 74% of the rated voltage, normal current charging is started, and then the switching tube Q3 and the switching tube Q4 in fig. 3 are switched on, the blue light is turned on, the red light is turned on, and the green light is turned off.

The charging current can be amplified by detecting the current of the resistor RM1 and the resistor RM2 in FIG. 3 and converting the current into voltage to be input into U3 in FIG. 2, the U3 amplifies the signal and then inputs the amplified signal into the PIN20 PIN of the main control MCU for detection and control, the PIN1 of the main control MCU outputs high level, the control switch tube Q1 is conducted, the resistor R26 is grounded, the total resistance of the current adjusting unit 11 is changed, and therefore the current is adjusted. The lowest charging voltage of the charging equipment is set by dividing voltage through a resistor R2 and a resistor R3, the voltage on a voltage dividing resistor R3 is detected, when the voltage of the resistor R3 is higher than 0.94V, and the pin 14 of the main control MCU detects that the voltage of the resistor R3 is higher than 0.94V, the main control MCU judges that the charging starting voltage of the charging equipment is too low, the charging equipment is abnormal, charging is refused, the switch tube Q3 and the switch tube Q4 are turned off by the level sent by the 10 pins of the master control MCU, meanwhile, the

pins

15, 16 and 17 of the main control MCU send out instructions to control the blue light to be on, the red light to flash and the green light to be off, when the battery voltage is mainly set to be lower than 50 percent of the required rated voltage during actual work, the charging is cut off, when the battery voltage is greater than 50% of the rated set voltage, the normal charging mode is recovered, and the 50% lowest battery charging voltage can be changed through the resistor R2 and the resistor R3 and can also be set through the main control MCU. When the positive and negative poles of the battery are opposite to the output connection of the main charging module 2, the switch tube Q3 and the switch tube Q4 are turned off, the blue light is on, the red light is flashed, and the green light is turned off. In addition, by setting the charging time, when the charging reaches the specified time, the main control MCU sends an instruction to turn off the switch tube Q3 and the switch tube Q4, turn on the blue light, flash the red light and turn off the green light. When the current signal amplified by the U3 detected by the pin20 of the main control MCU is less than 0.16V, the green light is controlled to be on, and when the current signal is less than 0.13V, the switching tube Q3 and the switching tube Q4 are turned off, the blue light is on, the red light flashes, and the green light is off. The 2 feet of the main control MCU detect whether the charging equipment connected to the main charging module 2 is full-charge charging equipment, if the charging equipment is full-charge, the voltage of the 2 feet of the main control MCU is 0, the green light is directly controlled to be on, and charging is refused. The state prompting unit 6 has indication states in4, firstly, when the load is empty or the battery is fully charged, the green light and the blue light are normally on; secondly, when the output voltage is abnormal, the blue light flickers, and the red light and the green light are turned off; thirdly, when the voltage of the battery is abnormal, the red light flickers and the green light is turned off; fourth, when charging is normal, the red light is on and the green light is off.

The charging device can automatically distinguish and detect the voltage state and the connection state of the charging device, enters a preset state to work after the connection is normal, and turns off the output to stop charging when the connection is abnormal; the charging equipment is provided with three indicator lights of red, blue and green, and corresponding state indication can be made in the processes of power-on self-test and charging of the charging equipment, so that a user can know the charging state of the current charging equipment conveniently; in addition, a pre-charging function of the charging equipment is also arranged, and the charging equipment is automatically detected to be changed into a low-current charging state when the voltage of the charging equipment is lower than a set state; meanwhile, the charging control circuit of the embodiment also has the functions of reverse connection protection of the charging equipment and the main charging module 2, overvoltage prevention, backflow prevention and the like, and can detect the abnormality of the charging equipment in time and take corresponding measures, so that the charging equipment can be better protected.

The above description is only for the preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention is disclosed in the preferred embodiment, it is not limited to the above description, and any person skilled in the art can make some changes or modifications to equivalent embodiments without departing from the scope of the present invention, but all the technical solutions of the present invention are within the scope of the present invention.

Claims

1. A charge control circuit, characterized by: comprises a main control circuit and a main power circuit; the main power supply circuit comprises a switch module and a main charging module, and the main control circuit comprises a main control MCU, an output voltage detection module, a current detection control module and a voltage stabilization power supply module;

the input end and the output end of the main charging module are respectively connected with a power supply and charging equipment, the output voltage of the main charging module is connected with the input end of the switch module after passing through the charging equipment, the output end of the switch module is a detection point of voltage and current, and the control end of the switch module is connected with a main control MCU (microprogrammed control unit); the output voltage detection module is used for detecting the output voltage value of the main charging module and feeding back the detection result to the main control MCU, the current detection control module is used for detecting the output current value of the main charging module and feeding back the detection result to the main control MCU, the main control MCU controls the switch module to be switched on or switched off and controls the magnitude of the charging voltage and current according to the obtained detection result, the switch module is switched on and switched off to respectively control the main charging module to perform or stop charging work, and the power supply end of the main control MCU and the power supply end of the current detection control module are both connected with the output end of the voltage-stabilizing power supply module.

2. The charge control circuit of claim 1, wherein: the switch module comprises a switch tube Q3, a switch tube Q4, a resistor RM1 and a resistor RM2, control ends of a switch tube Q3 and a switch tube Q4 are connected with the main control MCU, a first switch end of a switch tube Q3 is connected with a first switch end of a switch tube Q4, a second switch end of the switch tube Q3 is connected with an input end of the current detection control module, a second switch end of a switch tube Q4 is connected with the charging device, the second switch end of the switch tube Q3 is grounded through a resistor RM1, and the resistor RM2 is connected with the resistor RM1 in parallel.

3. The charge control circuit of claim 1, wherein: the main charging module comprises a state prompting unit, and a control end of the state prompting unit is connected with the main control MCU.

4. The charge control circuit of claim 3, wherein: the state prompting unit comprises a light emitting diode LED-R, a light emitting diode LED-G, a light emitting diode LED-B, a resistor RS15, a resistor RS17 and a resistor RS21, cathodes of the light emitting diode LED-R, the light emitting diode LED-G and the light emitting diode LED-B are all connected with the master control MCU, an anode of the light emitting diode LED-R is connected with power supply voltage after passing through the resistor RS15, an anode of the light emitting diode LED-G is connected with the power supply voltage after passing through the resistor RS17, and an anode of the light emitting diode LED-B is connected with the power supply voltage after passing through the resistor RS 21.

5. The charge control circuit of claim 1, wherein: the output voltage detection module comprises a first voltage detection unit and a second voltage detection unit, the first voltage detection unit is used for detecting the voltage value of the charging equipment and inputting the detected voltage value into the main control MCU, the second voltage detection unit is used for detecting the lower limit voltage of the charging equipment and inputting the detected lower limit voltage value into the main control MCU, and the main control MCU controls the switch-on or switch-off of the switch module and controls the magnitude of the charged voltage current according to the received voltage value.

6. The charge control circuit of claim 5, wherein: the first voltage detection unit comprises a resistor R6 and a resistor R7, the output end of the main charging module is connected with the output end of the switch module after sequentially passing through a resistor R6 and a resistor R7, and the connection end of the resistor R6 and the resistor R7 is connected with the main control MCU;

the second voltage detection unit comprises a resistor R2 and a resistor R3, the output end of the main charging module is connected with the output end of the switch module after sequentially passing through a resistor R2 and a resistor R3, and the connecting sections of the resistor R2 and the resistor R3 are connected with the main control MCU.

7. The charge control circuit of claim 1, wherein: the main charging module further comprises a primary power supply unit and a secondary power supply unit, and the input end of the primary power supply unit is connected with a power supply; the current detection control circuit comprises a current detection amplifying unit, a voltage stabilizing unit and a current adjusting unit;

the input end of the voltage stabilizing unit is connected with the output end of the primary power supply unit, and the output end of the voltage stabilizing unit is connected with the input end of the voltage stabilizing power supply module; the input end of the current adjusting unit is connected with the output end of the switch module, the current adjusting unit is used for controlling and adjusting the output current of the main charging module, and the output end of the current adjusting unit and the output end of the voltage stabilizing unit are both connected with the output end of the secondary power supply unit; the input end of the current detection amplifying unit is connected with the output end of the switch module, the current detection amplifying unit amplifies the received current and then inputs the amplified current into the main control MCU, and the main control MCU controls the magnitude of the pre-charging current output to the charging equipment according to the received amplified current.

8. The charge control circuit of claim 7, wherein: the current adjusting unit comprises a first operational amplifier X1, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a resistor R28 and a switch tube Q1, wherein the inverting input end of the first operational amplifier X1 is connected with the output end of the switch module, a resistor R20 and a diode D4 are arranged between the output end of the first operational amplifier X1 and the output end of the secondary power supply unit, the non-inverting input end of the first operational amplifier X1 is grounded after sequentially passing through a resistor R28, a resistor R26 and the switch end of the switch tube Q1, and the control end of the switch tube Q1 is connected with the main control MCU;

the voltage stabilizing unit comprises a second operational amplifier X2, the inverting input end of the second operational amplifier X2 is connected with the output end of the primary power supply unit, the non-inverting input end of the second operational amplifier X2 is grounded after sequentially passing through a resistor R23 and a resistor R24, a resistor R25 is connected with a resistor R24 in parallel, one end of the resistor R22 is connected with the non-inverting input end of the second operational amplifier X2, the other end of the resistor R22 is connected with the input end of the voltage stabilizing power supply module, and a resistor R21 and a diode D3 are arranged between the output end of the second operational amplifier X2 and the output end of the secondary power supply unit.

9. The charge control circuit of claim 7, wherein: the current detection amplifying unit comprises a third operational amplifier U3 and a current amplification factor adjusting part, the input end of the third operational amplifier U3 is connected with the output end of the switch module, the output end of the third operational amplifier U3 is connected with the main control MCU, and the current amplification factor adjusting part is used for adjusting the current amplification factor of the third operational amplifier U3.

10. The charge control circuit of claim 7, wherein: the primary power supply unit comprises a primary side power supply part, a high-frequency switch transformation part, a primary side PWM control part and a first rectification filtering part, wherein power supply voltage is input through the primary side power supply part, then is input into the first rectification filtering part after being subjected to voltage reduction through the primary side PWM control part and the high-frequency switch transformation part, and the input voltage is output to the charging equipment after being subjected to rectification filtering through the first rectification filtering part;

the secondary power supply unit comprises a second rectifying and filtering unit and a resistor RS12, and the input voltage of the secondary power supply unit is rectified and filtered by the second rectifying and filtering unit and then is connected with the output end of the current regulating unit and the output end of the voltage stabilizing unit through the resistor RS 12.