Integrated switch type constant-current charger with remote control function

Abstract

The utility model discloses an integrated switch type constant current charger with a remote control function. The charger comprises an AC input circuit, a transformer, a rectification and filter circuit, an integrated switch chopper circuit, an output filter circuit and a charging output circuit which are connected in sequence. The integrated switch chopper circuit comprises a constant-current charging power circuit and a constant-current charging control circuit, and the constant-current charging control circuit controls the constant-current charging power circuit to realize constant output charging current; the output quantity sampling circuit is used for sampling current and voltage values output by charging and transmitting sampling information to the MCU control circuit, and the MCU control circuit is used for controlling the constant-current charging control circuit; and a remote computer realizes data communication with the MCU control circuit through the communication interface circuit. The utility model has the advantages of constant current charging output, small charging loss, automatic floating charging mode, wide output voltage range, fast charging speed, strong power grid adaptability, computer remote control and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to a charging circuit, specifically, relate to an integrated switch mode constant current charger with remote control function. BACKGROUND

[0002] Because the battery is very low in the feeding resistance, the charging current must be limited to ensure the charging safety, so generally uses the special charger to charge the battery. The traditional charger adopts the way of output terminal series limiting resistor to limit the charging current, and the structure is relatively simple, but the series limiting resistor makes the power consumption of the charger increase, and influences the charging efficiency. The traditional switch mode constant current charger can only realize the local control adjustment through the potentiometer and external circuit, and cannot implement the remote monitoring output parameter.

[0003] In addition, the battery approaches the full charge due to the decrease of the charging current and makes the charging time increase. UTILITY MODEL CONTENTS

[0004] The utility model discloses an integrated switch mode constant current charger with remote control function which is designed to solve the above technical problems.

[0005] The utility model adopts the technical scheme that:

[0006] An integrated switch mode constant current charger with remote control function, comprising AC input circuit, transformer, rectification and filter circuit, integrated switch chopping circuit, output filter circuit and charging output circuit connected in sequence. The integrated switch chopping circuit comprises constant current charging power circuit and constant current charging control circuit, and the constant current charging power circuit is controlled through the constant current charging control circuit to realize the constant output charging current. The current and voltage values of the charging output are sampled through the output quantity sampling circuit, and the sampling information is transmitted to the MCU control circuit. The remote computer realizes data communication with the MCU control circuit through the communication interface circuit.

[0007] The integrated switch mode constant current charger with remote control function, the constant current charging power circuit comprises a switching chopper IC1, a photoelectric coupler secondary IC2-A and peripheral elements; the output of the rectification and filtering circuit is connected to the input VIN of the constant current charging power circuit, the input VIN is connected to the IN end of the switching chopper IC1, the SG end of the switching chopper IC1 is connected to the output -Vout end of the constant current charging power circuit, the VADJ end of the switching chopper IC1 is connected to the 4th pin of the photoelectric coupler secondary IC2-A and the connection point of the series-connected resistors R* and R1, the OUT end of the switching chopper IC1 is connected to the cathode of the diode D2 and one end of the inductor L30, the anode of the diode D2 is grounded; the other end of the inductor L30 is connected to the anode of the diode D1, the positive poles of the capacitors C2 and C3, the cathode of the diode D3, the other end of the resistor R*, the positive poles of the capacitors C4 and C5, the 6th pin of the photoelectric coupler secondary IC2-A, the anode of the diode D4, the cathode of the diode D4 is connected to the output +Vout end of the constant current charging power circuit, and the cathode of the diode D1 is connected to the input VIN; the ground GND is connected to the output -Vout end of the constant current charging power circuit through the resistor Rs; the output -Vout end is connected to the negative poles of the capacitors C2, C3 and C5, the anode of the diode D3 and the other end of the resistor R1.

[0008] The integrated switch mode constant current charger with remote control function, the constant current charging control circuit comprises a three-stage voltage regulator IC4, an operational amplifier IC3, a photoelectric coupler primary IC2-B and peripheral elements; the 1st pin of the three-stage voltage regulator IC4 is connected to the input VIN end, the 2nd pin is grounded, and the 3rd pin is connected to one end of R31, the positive supply end of the operational amplifier IC3 and the positive pole of the capacitor C32, the negative pole of the capacitor C32 is connected to the ground GND; the same phase end of the operational amplifier IC3 is connected to the connection point R through the resistor R32; the R point is connected to one end of the sampling resistor Rs which is connected in series on the output negative line; the opposite phase end is connected to the connection point of the series-connected resistors R31 and R3*, the other end of the resistor R3* is connected to the ground GND; the negative supply end of the operational amplifier IC3 is connected to the ground GND, and the output end of the operational amplifier IC3 is sequentially connected to the resistor R33, the inductor L31 and the 1st pin of the photoelectric coupler primary IC2-B in series, the 2nd pin of the photoelectric coupler primary IC2-B is connected to the ground GND, and the capacitors C31 are connected in parallel between the 1st pin and the 2nd pin of the photoelectric coupler primary IC2-B.

[0009] The integrated switch mode constant current charger with remote control function, the transformer adopts a high-isolation power frequency transformer to realize isolation and voltage reduction.

[0010] The integrated switch mode constant current charger with remote control function, the photoelectric coupler IC2 adopts a TIL117 photoelectric coupler to realize voltage comparator adjustment through photoelectric coupler feedback.

[0011] The integrated switch mode constant current charger with remote control function, the communication interface circuit adopts RS485 / 232 interface, and remote control and parameter reading are realized through the RS485 / 232 interface of the computer to realize remote control of the MCU control circuit.

[0012] The integrated switch mode constant current charger with remote control function, the switch chopper adopts a switch chopper with a model number of L4960.

[0013] The integrated switch mode constant current charger with remote control function, the three-stage voltage stabilizer adopts a three-stage voltage stabilizer with a model number of LM7806, and the operational amplifier adopts an operational amplifier with a model number of LM358N.

[0014] The utility model relates to an online integrated switch mode charger, input adopts power frequency transformer voltage reduction, and direct current output adopts integrated switch chopper voltage stabilization.

[0015] The working process of the utility model is as follows: AC 220V input is isolated and reduced through a power frequency transformer first to meet the low voltage power supply requirement of the rear chopper chip, is converted into pulsating direct current through a rectifier filter circuit, and then is output with stable voltage through an integrated switch chopper; the charging control circuit adopts low resistance resistance sampling and optocoupler feedback, and the voltage comparator adjusts the output current.

[0016] The utility model has the following advantages compared with the traditional linear power supply:

[0017] 1. Online working mode, directly connected to the power grid.

[0018] 2. Constant current charging mode, ensures charging safety and fast charging demand.

[0019] 3. Automatically enters the float charging mode after the battery is fully charged.

[0020] 4. Full metal seal, physical potting, harsh use environment.

[0021] 5. Remote computer control and output reading.

[0022] 6. Strong power grid compatibility.

[0023] The utility model discloses a beneficial effect is: having constant current charging output, charging loss is small, automatic float charging mode, output voltage range is wide, charging speed is fast, power grid adaptive capacity is strong, can realize computer remote control and the like characteristics. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the utility model circuit principle diagram for the utility model circuit principle diagram;

[0025] Figure 2 It is the utility model input power frequency voltage reduction and rectification filter circuit principle diagram for the utility model input power frequency voltage reduction and rectification filter circuit principle diagram;

[0026] Figure 3 It is the utility model constant current charging power part principle diagram for the utility model constant current charging power part principle diagram;

[0027] Figure 4 It is the utility model output filter circuit principle diagram for the utility model output filter circuit principle diagram;

[0028] Figure 5 It is the utility model constant current charging control part principle diagram for the utility model constant current charging control part principle diagram. DETAILED DESCRIPTION

[0029] The utility model is further explained below in connection with the drawings and examples.

[0030] As Figures 1-5 The utility model discloses a kind of integrated switch mode constant current charger with remote control function, including sequentially connected alternating current input circuit, transformer, rectification and filter circuit, integrated switch chopper circuit, output filter circuit and charging output circuit;The integrated switch chopper circuit includes constant current charging power circuit and constant current charging control circuit, and constant current charging power circuit is realized output charging current constant by the constant current charging control circuit control;The current and voltage value of charging output are sampled by output quantity sampling circuit, and sampling information is transmitted to MCU control circuit, and constant current charging control circuit is controlled by MCU control circuit;Remote computer realizes data communication with MCU control circuit by communication interface circuit.

[0031] As Figure 3As shown, the integrated switch-type constant current charger with remote control function includes a constant current charging power circuit comprising a switching chopper IC1, an optocoupler secondary IC2-A, and peripheral components. The output of the rectifier and filter circuit is connected to the input VIN of the constant current charging power circuit. The input VIN is connected to the IN terminal of the switching chopper IC1. The SG terminal of the switching chopper IC1 is connected to the output -Vout terminal of the constant current charging power circuit. The VADJ terminal of the switching chopper IC1 is connected to pin 4 of the optocoupler secondary IC2-A and the connection point of series resistors R* and R1. The OUT terminal of the switching chopper IC1 is connected to the cathode of diode D2 and the inductor. One end of inductor L30 is connected to ground via the anode of diode D2; the other end of inductor L30 is connected to the anode of diode D1, the positive terminals of capacitors C2 and C3, the cathode of diode D3, the other end of resistor R*, the positive terminals of capacitors C4 and C5, pin 6 of the secondary IC2-A of optocoupler, and the anode of diode D4. The cathode of diode D4 is connected to the output +Vout terminal of the constant current charging power circuit, and the cathode of diode D1 is connected to the input VIN. Ground GND is connected to the output -Vout terminal of the constant current charging power circuit through resistor Rs. The output -Vout terminal is connected to the negative terminals of capacitors C2, C3, and C5, the anode of diode D3, and the other end of resistor R1.

[0032] like Figure 5 As shown, the integrated switch-type constant current charger with remote control function includes a constant current charging control circuit comprising a three-stage voltage regulator IC4, an operational amplifier IC3, an optocoupler primary IC2-B, and peripheral components. Pin 1 of the three-stage voltage regulator IC4 is connected to the input VIN terminal, pin 2 is grounded, and pin 3 is connected to one end of resistor R31, the positive power supply terminal of operational amplifier IC3, and the positive terminal of capacitor C32. The negative terminal of capacitor C32 is connected to ground GND. The non-inverting input of operational amplifier IC3 is connected to connection point R through resistor R32. Figure 3 As shown, the sampling resistor Rs connected in series on the negative output line is located near the output end; the inverting terminal is connected to the connection point of series resistors R31 and R3*, and the other end of resistor R3* is connected to ground GND; the negative power supply terminal of operational amplifier IC3 is connected to ground GND, and the output terminal of operational amplifier IC3 is connected in series with resistor R33, inductor L31, and pin 1 of the primary IC2-B of optocoupler in sequence. Pin 2 of the primary IC2-B of optocoupler is connected to ground GND, and capacitor C31 is connected in parallel in the forward direction between pins 1 and 2 of the primary IC2-B of optocoupler.

[0033] The integrated switch-type constant current charger with remote control function uses a high-isolation power frequency transformer to achieve isolation and voltage reduction.

[0034] The integrated switch mode constant current charger with remote control function, the photoelectric coupler IC2 adopts TIL117 photoelectric coupler, and voltage comparator adjustment is realized through photoelectric coupler feedback.

[0035] The integrated switch mode constant current charger with remote control function, the communication interface circuit adopts RS485 / 232 interface, and remote control and parameter reading are realized through the RS485 / 232 interface of the computer to realize remote control of the MCU control circuit.

[0036] The integrated switch mode constant current charger with remote control function, the switch chopper adopts a switch chopper with the model number L4960.

[0037] The integrated switch mode constant current charger with remote control function, the three-stage voltage stabilizer adopts a three-stage voltage stabilizer with the model number LM7806, and the operational amplifier adopts an operational amplifier with the model number LM358N.

[0038] The utility model discloses an online integrated switch mode charger, and the AC input voltage first enters the power frequency transformer, and the power frequency transformer adopts power grid compatibility design, and the overload capacity is strong, so that the power supply whole machine power grid adaptability is greatly promoted. The power frequency AC voltage after the voltage reduction of the power frequency transformer is rectified through the rectifier bridge, becomes the pulsating DC, and after filtering through the filter capacitor group, enters the switch chopper.

[0039] In the charging power circuit part, the adjusting tube in the switch chopper works in the switch state, the VADJ end is sampled to the output voltage through the voltage dividing resistor of the output end, and then is fed back to the chip control circuit. After the chip control circuit processes the sampling signal, the output voltage is controlled by changing the switch duty ratio of the adjusting tube, and the voltage is relatively stable. The output sampling adopts the low resistance resistor series connection in the output circuit, and the output current change is detected through the voltage change of the sampling resistor two ends, and is fed back to the adjusting circuit to adjust the output voltage, so that the output voltage is adaptively adjusted in the gradual charging process of the storage battery, and the relative constant of the charging current is realized.

[0040] The utility model is not limited to the above-mentioned best implementation, and any other product same or similar to the utility model can be derived by any person under the enlightenment of the utility model, and falls in the protection scope of the utility model.

Claims

1. An integrated switch-type constant current charger with remote control function, comprising an AC input circuit, a transformer, a rectifier and filter circuit, an integrated switch chopper circuit, an output filter circuit, and a charging output circuit connected in sequence; characterized in that: The integrated switching chopper circuit includes a constant current charging power circuit and a constant current charging control circuit. The constant current charging power circuit is controlled by the constant current charging control circuit to achieve a constant output charging current. The output current and voltage values ​​are sampled by the output sampling circuit and the sampling information is transmitted to the MCU control circuit. The MCU control circuit controls the constant current charging control circuit. The remote computer communicates with the MCU control circuit through the communication interface circuit.

2. The integrated switch-type constant current charger with remote control function according to claim 1, characterized in that: The constant current charging power circuit includes a switching chopper IC1, an optocoupler secondary IC2-A, and peripheral components. The output of the rectifier and filter circuit is connected to the input VIN of the constant current charging power circuit. The input VIN is connected to the IN terminal of the switching chopper IC1. The SG terminal of the switching chopper IC1 is connected to the output -Vout terminal of the constant current charging power circuit. The VADJ terminal of the switching chopper IC1 is connected to pin 4 of the optocoupler secondary IC2-A and the connection point of series resistors R* and R1. The OUT terminal of the switching chopper IC1 is connected to the cathode of diode D2 and one end of inductor L30. The anode of diode D2... Ground; the other end of inductor L30 is connected to the anode of diode D1, the positive terminals of capacitors C2 and C3, the cathode of diode D3, the other end of resistor R*, the positive terminals of capacitors C4 and C5, pin 6 of the secondary IC2-A of optocoupler, and the anode of diode D4. The cathode of diode D4 is connected to the output +Vout terminal of the constant current charging power circuit, and the cathode of diode D1 is connected to the input VIN. Ground GND is connected to the output -Vout terminal of the constant current charging power circuit through resistor Rs. The output -Vout terminal is connected to the negative terminals of capacitors C2, C3, and C5, the anode of diode D3, and the other end of resistor R1.

3. The integrated switch-type constant current charger with remote control function according to claim 1, characterized in that: The constant current charging control circuit includes a three-stage voltage regulator IC4, an operational amplifier IC3, an optocoupler primary IC2-B, and peripheral components. Pin 1 of the three-stage voltage regulator IC4 is connected to the input VIN terminal, pin 2 is grounded, and pin 3 is connected to one end of resistor R31, the positive power supply terminal of operational amplifier IC3, and the positive terminal of capacitor C32. The negative terminal of capacitor C32 is connected to ground GND. The non-inverting input of operational amplifier IC3 is connected to connection point R through resistor R32. Connection point R is connected in series with the sampling resistor Rs on the negative output line near the output end. The inverting input is connected to the connection point of series resistors R31 and R3*, and the other end of resistor R3* is connected to ground GND. The negative power supply terminal of operational amplifier IC3 is connected to ground GND. The output terminal of operational amplifier IC3 is connected in series with resistor R33, inductor L31, and pin 1 of optocoupler primary IC2-B. Pin 2 of optocoupler primary IC2-B is connected to ground GND. Capacitor C31 is connected in parallel in the positive direction between pins 1 and 2 of optocoupler primary IC2-B.

4. The integrated switch-type constant current charger with remote control function according to claim 1, characterized in that: The transformer is a high-isolation power frequency transformer to achieve isolation and voltage reduction.

5. The integrated switch-type constant current charger with remote control function according to claim 2 or 3, characterized in that: The optocoupler IC2 uses a TIL117 optocoupler, which adjusts the voltage comparator through optocoupler feedback.

6. The integrated switch-type constant current charger with remote control function according to claim 1, characterized in that: The communication interface circuit adopts an RS485 / 232 interface. The computer can remotely control and read parameters through the RS485 / 232 interface to realize remote control of the MCU control circuit.

7. The integrated switch-type constant current charger with remote control function according to claim 2, characterized in that: The switching chopper used is a model L4960 switching chopper.

8. The integrated switch-type constant current charger with remote control function according to claim 3, characterized in that: The three-stage voltage regulator is an LM7806 model, and the operational amplifier is an LM358N model.

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