Double-battery high-power automatic switching charging system

Abstract

The utility model discloses a double-battery high-power automatic switching charging system, which comprises a switching power supply circuit, a main control circuit, a fan control circuit, an output current detection circuit, a first output control circuit and a second output control circuit, a first output port of the first output control circuit is connected with the output end of the first switching circuit and the output end of the first pre-charging circuit, and the input end of the first pre-charging circuit and the first control end of the first switching circuit are connected with the main control circuit; a second output port of the second output control circuit is connected with the output end of the second switching circuit and the output end of the second pre-charging circuit, the input end of the second pre-charging circuit and the first control end of the second switching circuit are connected with the main control circuit, and the input ends of the first switching circuit and the second switching circuit are connected with the output end of the switching power supply circuit; the main control circuit is connected with the first output port and the second output port through the output current detection circuit. According to the utility model, the two batteries can be charged in sequence, which is convenient for users to use.

Description

Technical Field

[0001] This utility model relates to the field of battery charging, and in particular to a dual-battery high-power automatic switching charging system. Background Technology

[0002] Currently, high-powered devices powered by batteries (such as large camcorders) are equipped with large-capacity batteries to ensure their continued operation. To guarantee extended use, users typically equip these devices with at least two batteries. However, existing battery chargers generally only charge one battery at a time. This forces users to manually remove the first battery after it's fully charged and install the second. If this isn't done promptly, the second battery may not be fully charged or even at all when the user is carrying the high-powered device, significantly impacting usability. Furthermore, existing battery chargers for large-capacity batteries have low charging efficiency, taking a very long time to fully charge them.

[0003] In view of the above problems, it is necessary to study a dual-battery high-power automatic switching charging system that can charge the two batteries sequentially. Utility Model Content

[0004] The purpose of this invention is to provide a dual-battery high-power automatic switching charging system that can charge two batteries sequentially.

[0005] To achieve the above objectives, the solution of this utility model is:

[0006] A dual-battery high-power automatic switching charging system includes a switching power supply circuit, a main control circuit, a fan control circuit, an output current detection circuit, a first output control circuit, and a second output control circuit. The first output control circuit includes a first output port J1, a first switching circuit, and a first pre-charging circuit. The Vbat1 pin of the first output port J1 is connected to the output terminals of the first switching circuit and the first pre-charging circuit. The input terminal of the first pre-charging circuit is connected to the main control circuit. The input terminal of the first switching circuit is connected to the output terminal of the switching power supply circuit. The first control terminal of the first switching circuit is connected to the main control circuit. The second output control circuit includes a second output port J2, a second switching circuit, and a second pre-charging circuit. The Vbat2 pin of the second output port J2 is connected to the output terminals of the second switching circuit and the second pre-charging circuit. The input terminal of the second pre-charging circuit is connected to the main control circuit. The input terminal of the second switching circuit is connected to the output terminal of the switching power supply circuit. The first control terminal of the second switching circuit is connected to the main control circuit. The input terminal of the output current detection circuit is connected to the IS pin of the first output port J1 and the IS pin of the second output port J2. The output terminal of the output current detection circuit is connected to the main control circuit. The fan control circuit is connected to the main control circuit.

[0007] The dual-battery high-power automatic switching charging system also includes an overvoltage detection circuit. The input terminal of the overvoltage detection circuit is connected to the output terminal of the switching power supply circuit, and the output terminal of the overvoltage detection circuit is connected to the second control terminal of the first switching circuit and the second control terminal of the second switching circuit.

[0008] The first switching circuit includes resistors R607, R608, R609, R610, R611, and R612, diode D602, MOSFETs Q601, Q602, Q603, Q604, and Q607, and transistor Q608; the first terminal of resistor R610 is connected to the first control terminal of the first switching circuit, and the second terminal of resistor R610 is connected to the collector of transistor Q608 and the first terminal of resistor R609. The gate of MOSFET Q607 and the base of transistor Q608 are connected to the first terminals of resistors R611 and R612. The second terminal of resistor R611 is connected to the cathode of diode D602. The anode of diode D602 is connected to the second control terminal of the first switching circuit. The second terminals of resistors R612 and R609, the emitter of transistor Q608, and the source of MOSFET Q607 are connected to the ground terminal of the first switching circuit. The ground terminal of the first switching circuit is connected to the first output port J1. The IS pin is connected to the drain of MOSFET Q607, which is connected to the first terminal of resistor R608. The second terminal of resistor R608 is connected to the gates of MOSFETs Q601, Q602, Q603, and Q604, and the first terminal of resistor R607. The second terminal of resistor R607 is connected to the source of MOSFETs Q602 and Q604. The drains of MOSFETs Q604 and Q603 are connected to the output of the first switching circuit. The source of MOSFET Q603 is connected to the source of MOSFET Q601, and the drains of MOSFET Q601 and MOSFET Q602 are connected to the input of the first switching circuit; the second switching circuit includes resistors R627, R628, R629, R630, R631, R632, diode D612, MOSFETs Q611, Q612, Q613, Q614, Q617, and transistor Q618;The first terminal of resistor R630 is connected to the first control terminal of the second switching circuit. The second terminal of resistor R630 is connected to the collector of transistor Q618, the first terminal of resistor R629, and the gate of MOSFET Q617. ​​The base of transistor Q618 is connected to the first terminals of resistors R631 and R632. The second terminal of resistor R631 is connected to the cathode of diode D612. The anode of diode D612 is connected to the second control terminal of the second switching circuit. The second terminals of resistors R632 and R629, the emitter of transistor Q618, and the source of MOSFET Q617 are connected to the ground terminal of the second switching circuit. The ground terminal of the second switching circuit is connected to the second output port J2. The IS pin is connected to the drain of MOSFET Q617, which is connected to the first terminal of resistor R628. The second terminal of resistor R628 is connected to the gates of MOSFETs Q611, Q612, Q613, and Q614, and the first terminal of resistor R627. The second terminal of resistor R627 is connected to the sources of MOSFETs Q612 and Q614. The drains of MOSFETs Q614 and Q613 are connected to the output of the second switching circuit. The source of MOSFET Q613 is connected to the source of MOSFET Q611, and the drains of MOSFETs Q611 and Q612 are connected to the input of the second switching circuit.

[0009] The overvoltage detection circuit includes resistors R327, R328, R329, R330, R331, R322, and comparator IC302B. The first ends of resistors R327 and R328 are connected to the input terminals of the overvoltage detection circuit. The second ends of resistors R327 and R328 are connected to the first ends of resistors R329, R330, and R331, and the non-inverting input terminal of comparator IC302B. The second ends of resistors R329 and R330 are connected to the ground terminal of the overvoltage detection circuit. The ground terminal of the overvoltage detection circuit is connected to the IS pin of the first output port J1 and the IS pin of the second output port J2. The inverting input terminal of comparator IC302B is connected to power supply V1.25V through resistor R322. The output terminal of comparator IC302B and the second end of resistor R331 are connected to the output terminal of the overvoltage detection circuit.

[0010] The first pre-charge circuit includes resistors R601, R602, R603, R604, R605, R606, transistor Q605, MOSFET Q606, and diode D601. The first terminal of resistor R601 is connected to the power supply terminal of the first pre-charge circuit, which is connected to the output terminal of the switching power supply circuit. The second terminal of resistor R601 is connected to the first terminal of resistor R603 and the emitter of transistor Q605 via resistor R602. The base of transistor Q605 is connected to the second terminal of resistor R603 and resistor R606. At the first end of 4, the collector of transistor Q605 is connected to the positive terminal of diode D601, the negative terminal of diode D601 is connected to the output terminal of the first pre-charge circuit, the second end of resistor R604 is connected to the drain of MOSFET Q606, the source of MOSFET Q606 and the first end of resistor R606 are connected to the ground terminal of the first pre-charge circuit, the ground terminal of the first pre-charge circuit is connected to the IS pin of the first output port J1, the gate of MOSFET Q606 is connected to the second end of resistor R606 and the first end of resistor R605, and the second end of resistor R605 is connected to the input terminal of the first pre-charge circuit; The second pre-charge circuit includes resistors R621, R622, R623, R624, R625, R626, transistor Q615, MOSFET Q616, and diode D611. The first end of resistor R621 is connected to the power supply terminal of the second pre-charge circuit, which is connected to the output terminal of the switching power supply circuit. The second end of resistor R621 is connected to the first end of resistor R623 and the emitter of transistor Q615 via resistor R622. The base of transistor Q615 is connected to the second end of resistor R623 and resistor R626. At the first end of 4, the collector of transistor Q615 is connected to the positive terminal of diode D611, the negative terminal of diode D611 is connected to the output terminal of the second pre-charge circuit, the second end of resistor R624 is connected to the drain of MOSFET Q616, the source of MOSFET Q616 and the first end of resistor R626 are connected to the ground terminal of the second pre-charge circuit, the ground terminal of the second pre-charge circuit is connected to the IS pin of the second output port J2, the gate of MOSFET Q616 is connected to the second end of resistor R626 and the first end of resistor R625, and the second end of resistor R625 is connected to the input terminal of the second pre-charge circuit.

[0011] The main control circuit is connected to the first output port J1 and the second output port J2 via an I2C bus circuit.

[0012] The dual-battery high-power automatic switching charging system also includes a first indicator light circuit and a second indicator light circuit, with the main control circuit connected to the first indicator light circuit and the second indicator light circuit.

[0013] The dual-battery high-power automatic switching charging system also includes a relay switch circuit. The control terminal of the relay switch circuit is connected to the main control circuit, and the input and output terminals of the relay switch circuit are respectively connected to the two ends of the thermistor NTC101 of the switching power supply.

[0014] The output current detection circuit includes resistors RS201, R320, R321, R324, R326, R702, R703, R704, a Zener diode ZD702, and an operational amplifier IC302A. The first terminals of resistors RS201 and R324 are connected to the input terminals of the output current detection circuit. The second terminals of resistors RS201 and R321 are grounded. The second terminals of resistors R321 and R320 are connected to the inverting input terminal of the operational amplifier IC302A. The second terminal of resistor R324 is connected to the inverting input terminal of the operational amplifier IC302A. The first terminal of resistor R326 is connected to the non-inverting input of op-amp IC302A. The second terminal of resistor R326 is connected to power supply V1.25V. The second terminal of resistor R320 and the output terminal of op-amp IC302A are connected to the first terminal of resistor R702. The second terminal of resistor R702 is connected to the first terminal of resistor R703, the first terminal of resistor R704 and the negative terminal of Zener diode ZD702. The second terminal of resistor R703 and the positive terminal of Zener diode ZD702 are connected to the input terminal of the output current detection circuit. The second terminal of resistor R704 is connected to the output terminal of the output current detection circuit.

[0015] The dual-battery high-power automatic switching charging system further includes a first voltage detection circuit, a second voltage detection circuit, and a third voltage detection circuit. The input terminal of the first voltage detection circuit is connected to the Vbat1 pin of the first output port J1, the input terminal of the second voltage detection circuit is connected to the Vbat2 pin of the second output port J2, and the input terminal of the third voltage detection circuit is connected to the output terminal of the switching power supply circuit. The output terminals of the first voltage detection circuit, the second voltage detection circuit, and the third voltage detection circuit are respectively connected to the main control circuit.

[0016] By adopting the above solution, the dual-battery high-power automatic switching charging system of this invention can accept two batteries. When two batteries are accepted, the invention first charges the first battery, and then automatically charges the second battery after the first battery is fully charged. This allows the invention to charge the two batteries sequentially, avoiding the inconvenience of manually switching batteries as required by existing systems. Furthermore, by charging the two batteries sequentially, the invention can charge a single battery at full power, ensuring a high charging rate. Additionally, by controlling the fan circuit, the invention can efficiently dissipate heat from the entire circuit, preventing high temperatures from affecting the charging rate. Attached Figure Description

[0017] Figure 1 This is a circuit diagram of the main control circuit, the first indicator light circuit, the second indicator light circuit, and the I2C bus circuit of this utility model.

[0018] Figure 2 This is a circuit diagram of the output current detection circuit and the overvoltage detection circuit of this utility model.

[0019] Figure 3 This is a circuit diagram of the first output control circuit and the second output control circuit of this utility model.

[0020] Figure 4 This is a circuit diagram of the fan control circuit of this utility model.

[0021] Figure 5 This is a partial circuit principle of the switching power supply circuit of this utility model. Figure 1 .

[0022] Figure 6 This is a partial circuit principle of the switching power supply circuit of this utility model. Figure 2 .

[0023] Figure 7 This is a partial circuit principle of the switching power supply circuit of this utility model. Figure 3 .

[0024] Figure 8 This is a circuit diagram of the relay switch circuit of this utility model.

[0025] Figure 9 The circuit diagrams are of the first voltage regulator circuit, the second voltage regulator circuit, the first voltage detection circuit, the second voltage detection circuit, and the third voltage detection circuit of this utility model. Detailed Implementation

[0026] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0027] like Figures 1 to 9As shown, this utility model discloses a dual-battery high-power automatic switching charging system, which includes a switching power supply circuit, a main control circuit, a fan control circuit, an output current detection circuit, a first output control circuit, and a second output control circuit. The first output control circuit includes a first output port J1, a first switching circuit, and a first pre-charging circuit. The Vbat1 pin of the first output port J1 is connected to the output terminal of the first switching circuit and the output terminal of the first pre-charging circuit. The input terminal of the first pre-charging circuit is connected to the main control circuit. The input terminal of the first switching circuit is connected to the output terminal of the switching power supply circuit. The first control terminal of the first switching circuit is connected to the main control circuit. The circuit includes a second output control circuit comprising a second output port J2, a second switching circuit, and a second pre-charging circuit. The Vbat2 pin of the second output port J2 is connected to the output terminals of the second switching circuit and the second pre-charging circuit. The input terminal of the second pre-charging circuit is connected to the main control circuit. The input terminal of the second switching circuit is connected to the output terminal of the switching power supply circuit. The first control terminal of the second switching circuit is connected to the main control circuit. The input terminal of the output current detection circuit is connected to the IS pin of the first output port J1 and the IS pin of the second output port J2. The output terminal of the output current detection circuit is connected to the main control circuit. The fan control circuit is connected to the main control circuit.

[0028] The first output port J1 and the second output port J2 of the dual-battery high-power automatic switching charging system of this invention are both used to connect batteries; the working principle of the dual-battery high-power automatic switching charging system of this invention is as follows:

[0029] Step S1: The main control circuit inputs a pre-charge current to the Vbat1 pin of the first output port J1 through the first pre-charge circuit. At the same time, the main control circuit detects whether the output current of the first output port J1 reaches the threshold through the output current detection circuit. If the output current of the first output port J1 reaches the threshold, it is determined that the first output port J1 is connected to the battery, and proceeds to step S2. If the output current of the first output port J1 does not reach the threshold, it is determined that the first output port J1 is not connected to the battery, and proceeds to step S3.

[0030] Step S2: The main control circuit controls the first pre-charge circuit to stop outputting and controls the first switching circuit to turn on, so that the switching power supply circuit supplies power to the Vbat1 pin of the first output port J1, thereby charging the battery connected to the first output port J1 at high power. At the same time, the main control circuit controls the fan control circuit to work and efficiently dissipate heat from the entire circuit. After the battery connected to the first output port J1 is fully charged, proceed to step S3.

[0031] Step S3: The main control circuit inputs a pre-charge current to the Vbat2 pin of the second output port J2 through the second pre-charge circuit. At the same time, the main control circuit detects whether the output current of the second output port J2 reaches the threshold through the output current detection circuit. If the output current of the second output port J2 reaches the threshold, it is determined that the second output port J2 is connected to the battery, and proceeds to step S4. If the output current of the second output port J2 does not reach the threshold, it is determined that the second output port J2 is not connected to the battery, and proceeds to step S1.

[0032] Step S4: The main control circuit controls the second pre-charge circuit to stop outputting and controls the second switching circuit to turn on, so that the switching power supply circuit supplies power to the Vbat2 pin of the second output port J2, thereby charging the battery connected to the second output port J2 at high power. At the same time, the main control circuit controls the fan control circuit to work and efficiently dissipate heat from the entire circuit. After the battery connected to the second output port J2 is fully charged, proceed to step S1.

[0033] As described above, the dual-battery high-power automatic switching charging system of this invention can accept two batteries. When two batteries are connected, the system first charges the first battery, and then automatically charges the second battery after the first battery is fully charged. This allows the system to charge the two batteries sequentially, avoiding the inconvenience of manually switching batteries as required by existing systems. Furthermore, by charging the two batteries sequentially, the system can charge each battery at full power, ensuring a high charging rate. Additionally, the system utilizes a fan control circuit to efficiently dissipate heat from the entire circuit, preventing high temperatures from affecting the charging rate.

[0034] In embodiments of this invention, the dual-battery high-power automatic switching charging system may further include an overvoltage detection circuit. The input terminal of the overvoltage detection circuit is connected to the output terminal of the switching power supply circuit, and the output terminal is connected to the second control terminal of the first switching circuit and the second control terminal of the second switching circuit. When the overvoltage detection circuit detects an overvoltage at the output terminal of the switching power supply circuit, it controls the first and second switching circuits to turn off, thereby preventing damage to the battery from overvoltage. The output terminal of the overvoltage detection circuit can be connected to a main control circuit, enabling the main control circuit to monitor whether an overvoltage occurs at the output terminal of the switching power supply circuit. The overvoltage detection circuit may include resistors R327, R328, R329, R330, R331, R322, and comparator IC302B. The first terminals of resistors R327 and R328 are connected to the input terminals of the overvoltage detection circuit. The second terminals of resistors R327 and R328 are connected to the first terminals of resistors R329, R330, and R331, and the non-inverting input terminal of comparator IC302B. The second terminals of resistors R329 and R330 are connected to the ground terminal of the overvoltage detection circuit. The ground terminal of the overvoltage detection circuit is connected to the IS pin of the first output port J1 and the IS pin of the second output port J2. The inverting input terminal of comparator IC302B is connected to the power supply V1.25V through resistor R322. The output terminal of comparator IC302B and the second terminal of resistor R331 are connected to the output terminal of the overvoltage detection circuit.

[0035] In an embodiment of this utility model, the first switching circuit may include resistors R607, R608, R609, R610, R611, R612, diode D602, MOSFETs Q601, Q602, Q603, Q604, Q607, and transistor Q608; the first end of resistor R610 is connected to the first control terminal of the first switching circuit, the second end of resistor R610 is connected to the collector of transistor Q608, the first end of resistor R609, and the gate of MOSFET Q607, the base of transistor Q608 is connected to the first end of resistor R611 and the first end of resistor R612, the second end of resistor R611 is connected to the cathode of diode D602, the anode of diode D602 is connected to the second control terminal of the first switching circuit, and the second end of resistor R612 and resistor R608 are connected to the second control terminal of the first switching circuit. The second terminal of 09, the emitter of transistor Q608, and the source of MOSFET Q607 are connected to the ground terminal of the first switching circuit. The ground terminal of the first switching circuit is connected to the IS pin of the first output port J1. The drain of MOSFET Q607 is connected to the first terminal of resistor R608. The second terminal of resistor R608 is connected to the gate of MOSFET Q601, the gate of MOSFET Q602, the gate of MOSFET Q603, the gate of MOSFET Q604, and the first terminal of resistor R607. The second terminal of resistor R607 is connected to the source of MOSFET Q602 and the source of MOSFET Q604. The drain of MOSFET Q604 and the drain of MOSFET Q603 are connected to the output terminal of the first switching circuit. The source of MOSFET Q603 is connected to the source of MOSFET Q601. The drain of MOSFET Q601 and the drain of MOSFET Q602 are connected to the input terminal of the first switching circuit.

[0036] In an embodiment of this utility model, the second switching circuit may include resistors R627, R628, R629, R630, R631, R632, diode D612, MOSFETs Q611, Q612, Q613, Q614, Q617, and transistor Q618; the first end of resistor R630 is connected to the first control terminal of the second switching circuit, the second end of resistor R630 is connected to the collector of transistor Q618, the first end of resistor R629, and the gate of MOSFET Q617, the base of transistor Q618 is connected to the first end of resistor R631 and the first end of resistor R632, the second end of resistor R631 is connected to the cathode of diode D612, the anode of diode D612 is connected to the second control terminal of the second switching circuit, and the second end of resistor R632 and resistor R629 are connected to the cathode of diode D612. The second terminal of 29, the emitter of transistor Q618, and the source of MOSFET Q617 are connected to the ground terminal of the second switching circuit. The ground terminal of the second switching circuit is connected to the IS pin of the second output port J2. The drain of MOSFET Q617 is connected to the first terminal of resistor R628. The second terminal of resistor R628 is connected to the gate of MOSFET Q611, the gate of MOSFET Q612, the gate of MOSFET Q613, the gate of MOSFET Q614, and the first terminal of resistor R627. The second terminal of resistor R627 is connected to the source of MOSFET Q612 and the source of MOSFET Q614. The drain of MOSFET Q614 and the drain of MOSFET Q613 are connected to the output terminal of the second switching circuit. The source of MOSFET Q613 is connected to the source of MOSFET Q611. The drain of MOSFET Q611 and the drain of MOSFET Q612 are connected to the input terminal of the second switching circuit.

[0037] In an embodiment of this utility model, the first pre-charging circuit may include resistors R601, R602, R603, R604, R605, R606, transistor Q605, MOSFET Q606, and diode D601. This first pre-charging circuit is actually an amplifier circuit. The first end of resistor R601 is connected to the power supply terminal of the first pre-charging circuit, which is connected to the output terminal of the switching power supply circuit. The second end of resistor R601 is connected to the first end of resistor R603 and the emitter of transistor Q605 via resistor R602. The base of transistor Q605 is connected to... The second end of resistor R603 and the first end of resistor R604 are connected. The collector of transistor Q605 is connected to the positive terminal of diode D601. The negative terminal of diode D601 is connected to the output terminal of the first pre-charge circuit. The second end of resistor R604 is connected to the drain of MOSFET Q606. The source of MOSFET Q606 and the first end of resistor R606 are connected to the ground terminal of the first pre-charge circuit. The ground terminal of the first pre-charge circuit is connected to the IS pin of the first output port J1. The gate of MOSFET Q606 is connected to the second end of resistor R606 and the first end of resistor R605. The second end of resistor R605 is connected to the input terminal of the first pre-charge circuit.

[0038] In an embodiment of this utility model, the second pre-charge circuit includes resistors R621, R622, R623, R624, R625, R626, transistor Q615, MOSFET Q616, and diode D611. This second pre-charge circuit is actually an amplifier circuit. The first end of resistor R621 is connected to the power supply terminal of the second pre-charge circuit, which is connected to the output terminal of the switching power supply circuit. The second end of resistor R621 is connected to the first end of resistor R623 and the emitter of transistor Q615 via resistor R622. The base of transistor Q615 is connected to the diode D611. The second terminal of resistor R623 and the first terminal of resistor R624 are connected. The collector of transistor Q615 is connected to the positive terminal of diode D611. The negative terminal of diode D611 is connected to the output terminal of the second pre-charge circuit. The second terminal of resistor R624 is connected to the drain of MOSFET Q616. The source of MOSFET Q616 and the first terminal of resistor R626 are connected to the ground terminal of the second pre-charge circuit. The ground terminal of the second pre-charge circuit is connected to the IS pin of the second output port J2. The gate of MOSFET Q616 is connected to the second terminal of resistor R626 and the first terminal of resistor R625. The second terminal of resistor R625 is connected to the input terminal of the second pre-charge circuit.

[0039] In an embodiment of this utility model, the output current detection circuit includes resistors RS201, R320, R321, R324, R326, R702, R703, R704, a Zener diode ZD702, and an operational amplifier IC302A. The first terminals of resistors RS201 and R324 are connected to the input terminals of the output current detection circuit. The second terminals of resistors RS201 and R321 are grounded. The second terminals of resistors R321 and R320 are connected to the inverting input terminal of the operational amplifier IC302A. The second terminal of resistor R324 and the first terminal of resistor R326 are connected to the non-inverting input terminal of op-amp IC302A. The second terminal of resistor R326 is connected to power supply V1.25V. The second terminal of resistor R320 and the output terminal of op-amp IC302A are connected to the first terminal of resistor R702. The second terminal of resistor R702 is connected to the first terminal of resistor R703, the first terminal of resistor R704 and the negative terminal of Zener diode ZD702. The second terminal of resistor R703 and the positive terminal of Zener diode ZD702 are connected to the input terminal of the output current detection circuit. The second terminal of resistor R704 is connected to the output terminal of the output current detection circuit.

[0040] In an embodiment of this utility model, the main control circuit can be connected to the first output port J1 and the second output port J2 via an I2C bus circuit, so that the main control circuit can obtain information about the batteries connected to the first output port J1 and the second output port J2.

[0041] In embodiments of this utility model, the dual-battery high-power automatic switching charging system of this utility model may further include a first indicator circuit and a second indicator circuit. The main control circuit is connected to the first indicator circuit and the second indicator circuit. The first indicator circuit is used to indicate whether the battery connected to the first output port J1 is being charged and whether it is fully charged. The second indicator circuit is used to indicate whether the battery connected to the second output port J2 is being charged and whether it is fully charged.

[0042] In embodiments of this invention, the dual-battery high-power automatic switching charging system may further include a relay switch circuit. The control terminal of the relay switch circuit is connected to the main control circuit, and the input and output terminals of the relay switch circuit are respectively connected to the two ends of the thermistor NTC101 of the switching power supply. When the switching power supply circuit of this invention first starts working, the main control circuit controls the relay switch circuit to open, so that the thermistor NTC101 can suppress surges. After the switching power supply circuit of this invention stabilizes, the main control circuit controls the relay switch circuit to close, short-circuiting the thermistor NTC101, thereby reducing power consumption.

[0043] In an embodiment of this utility model, the dual-battery high-power automatic switching charging system further includes a first voltage detection circuit, a second voltage detection circuit, and a third voltage detection circuit. The input terminal of the first voltage detection circuit is connected to the Vbat1 pin of the first output port J1, the input terminal of the second voltage detection circuit is connected to the Vbat2 pin of the second output port J2, and the input terminal of the third voltage detection circuit is connected to the output terminal of the switching power supply circuit. The output terminals of the first, second, and third voltage detection circuits are respectively connected to the main control circuit. The main control circuit can obtain the output voltage of the switching power supply, the voltage of the battery connected to the first output port J1, and the voltage of the battery connected to the second output port J2 through the first, second, and third voltage detection circuits. The first, second, and third voltage detection circuits can be in the form of voltage divider circuits.

[0044] In embodiments of this utility model, the main control circuit can be a microcontroller circuit, and the switching power supply circuit can adopt a PFC boost plus LLC resonant scheme, so that the output power of the switching power supply circuit is large and the charging efficiency of large-capacity batteries is guaranteed; the main control circuit can be powered by a +3.3V power supply, which is provided by a first voltage regulator circuit; while the V1.25V power supply is provided by a second voltage regulator circuit.

[0045] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A dual-battery high-power automatic switching charging system, characterized in that: It includes a switching power supply circuit, a main control circuit, a fan control circuit, an output current detection circuit, a first output control circuit, and a second output control circuit. The first output control circuit includes a first output port J1, a first switching circuit, and a first pre-charging circuit. The Vbat1 pin of the first output port J1 is connected to the output terminal of the first switching circuit and the output terminal of the first pre-charging circuit. The input terminal of the first pre-charging circuit is connected to the main control circuit. The input terminal of the first switching circuit is connected to the output terminal of the switching power supply circuit. The first control terminal of the first switching circuit is connected to the main control circuit. The second output control circuit includes a second output port J2, a second switching circuit, and a second pre-charging circuit. The Vbat2 pin of the second output port J2 is connected to the output terminal of the second switching circuit and the output terminal of the second pre-charging circuit. The input terminal of the second pre-charging circuit is connected to the main control circuit. The input terminal of the second switching circuit is connected to the output terminal of the switching power supply circuit. The first control terminal of the second switching circuit is connected to the main control circuit. The input terminal of the output current detection circuit is connected to the IS pin of the first output port J1 and the IS pin of the second output port J2, and the output terminal of the output current detection circuit is connected to the main control circuit. The fan control circuit is connected to the main control circuit.

2. The dual-battery high-power automatic switchover charging system of claim 1, wherein: It also includes an overvoltage detection circuit, the input of which is connected to the output of the switching power supply circuit, and the output of which is connected to the second control terminal of the first switching circuit and the second control terminal of the second switching circuit.

3. The dual-battery high-power automatic switching charging system as described in claim 2, characterized in that: The first switching circuit includes resistors R607, R608, R609, R610, R611, R612, diode D602, MOSFETs Q601, Q602, Q603, Q604, Q607, and transistor Q608. The first terminal of resistor R610 is connected to the first control terminal of the first switching circuit. The second terminal of resistor R610 is connected to the collector of transistor Q608, the first terminal of resistor R609, and the gate of MOSFET Q607. The base of transistor Q608 is connected to the first terminals of resistors R611 and R612. The second terminal of resistor R611 is connected to the cathode of diode D602. The anode of diode D602 is connected to the second control terminal of the first switching circuit. The second terminals of resistors R612 and R609... The emitter of transistor Q608 and the source of MOSFET Q607 are connected to the ground terminal of the first switching circuit. The ground terminal of the first switching circuit is connected to the IS pin of the first output port J1. The drain of MOSFET Q607 is connected to the first end of resistor R608. The second end of resistor R608 is connected to the gate of MOSFET Q601, the gate of MOSFET Q602, the gate of MOSFET Q603, the gate of MOSFET Q604, and the first end of resistor R607. The second end of resistor R607 is connected to the source of MOSFET Q602 and the source of MOSFET Q604. The drain of MOSFET Q604 and the drain of MOSFET Q603 are connected to the output terminal of the first switching circuit. The source of MOSFET Q603 is connected to the source of MOSFET Q601. The drain of MOSFET Q601 and the drain of MOSFET Q602 are connected to the input terminal of the first switching circuit. The second switching circuit includes resistors R627, R628, R629, R630, R631, and R632, diode D612, MOSFETs Q611, Q612, Q613, Q614, and Q617, and transistor Q618. The first terminal of resistor R630 is connected to the first control terminal of the second switching circuit. The second terminal of resistor R630 is connected to the collector of transistor Q618, the first terminal of resistor R629, and the gate of MOSFET Q617. ​​The base of transistor Q618 is connected to the first terminals of resistors R631 and R632. The second terminal of resistor R631 is connected to the cathode of diode D612. The anode of diode D612 is connected to the second control terminal of the second switching circuit. The second terminals of resistors R632 and R629... The emitter of transistor Q618 and the source of MOSFET Q617 are connected to the ground terminal of the second switching circuit. The ground terminal of the second switching circuit is connected to the IS pin of the second output port J2. The drain of MOSFET Q617 is connected to the first end of resistor R628. The second end of resistor R628 is connected to the gates of MOSFETs Q611, Q612, Q613, and Q614, and the first end of resistor R627. The second end of resistor R627 is connected to the sources of MOSFETs Q612 and Q614. The drains of MOSFETs Q614 and Q613 are connected to the output terminal of the second switching circuit. The source of MOSFET Q613 is connected to the source of MOSFET Q611. The drains of MOSFETs Q611 and Q612 are connected to the input terminal of the second switching circuit.

4. The dual-battery high-power automatic switchover charging system of claim 2, wherein: The overvoltage detection circuit includes resistors R327, R328, R329, R330, R331, R322, and comparator IC302B. The first ends of resistors R327 and R328 are connected to the input terminals of the overvoltage detection circuit. The second ends of resistors R327 and R328 are connected to the first ends of resistors R329, R330, and R331, and the non-inverting input terminal of comparator IC302B. The second ends of resistors R329 and R330 are connected to the ground terminal of the overvoltage detection circuit. The ground terminal of the overvoltage detection circuit is connected to the IS pin of the first output port J1 and the IS pin of the second output port J2. The inverting input terminal of comparator IC302B is connected to power supply V1.25V through resistor R322. The output terminal of comparator IC302B and the second end of resistor R331 are connected to the output terminal of the overvoltage detection circuit.

5. The dual-battery high-power automatic switching charging system as described in claim 1, characterized in that: The first pre-charge circuit includes resistors R601, R602, R603, R604, R605, R606, transistor Q605, MOSFET Q606, and diode D601. The first terminal of resistor R601 is connected to the power supply terminal of the first pre-charge circuit, which is connected to the output terminal of the switching power supply circuit. The second terminal of resistor R601 is connected to the first terminal of resistor R603 and the emitter of transistor Q605 via resistor R602. The base of transistor Q605 is connected to the second terminal of resistor R603 and resistor R606. At the first end of 4, the collector of transistor Q605 is connected to the positive terminal of diode D601, the negative terminal of diode D601 is connected to the output terminal of the first pre-charge circuit, the second end of resistor R604 is connected to the drain of MOSFET Q606, the source of MOSFET Q606 and the first end of resistor R606 are connected to the ground terminal of the first pre-charge circuit, the ground terminal of the first pre-charge circuit is connected to the IS pin of the first output port J1, the gate of MOSFET Q606 is connected to the second end of resistor R606 and the first end of resistor R605, and the second end of resistor R605 is connected to the input terminal of the first pre-charge circuit; The second pre-charge circuit includes resistors R621, R622, R623, R624, R625, R626, transistor Q615, MOSFET Q616, and diode D611. The first end of resistor R621 is connected to the power supply terminal of the second pre-charge circuit, which is connected to the output terminal of the switching power supply circuit. The second end of resistor R621 is connected to the first end of resistor R623 and the emitter of transistor Q615 via resistor R622. The base of transistor Q615 is connected to the second end of resistor R623 and resistor R626. At the first end of 4, the collector of transistor Q615 is connected to the positive terminal of diode D611, the negative terminal of diode D611 is connected to the output terminal of the second pre-charge circuit, the second end of resistor R624 is connected to the drain of MOSFET Q616, the source of MOSFET Q616 and the first end of resistor R626 are connected to the ground terminal of the second pre-charge circuit, the ground terminal of the second pre-charge circuit is connected to the IS pin of the second output port J2, the gate of MOSFET Q616 is connected to the second end of resistor R626 and the first end of resistor R625, and the second end of resistor R625 is connected to the input terminal of the second pre-charge circuit.

6. The dual-battery high-power automatic switchover charging system of claim 1, wherein: The main control circuit is connected to the first output port J1 and the second output port J2 via an I2C bus circuit.

7. The dual-battery high-power automatic switchover charging system according to claim 1 or 6, characterized in that: It also includes a first indicator light circuit and a second indicator light circuit, with the main control circuit connected to the first indicator light circuit and the second indicator light circuit.

8. The dual-battery high-power automatic switchover charging system of claim 1, wherein: It also includes a relay switch circuit, the control terminal of which is connected to the main control circuit, and the input and output terminals of which are respectively connected to the two ends of the thermistor NTC101 of the switching power supply.

9. The dual-battery high-power automatic switching charging system as described in claim 1, characterized in that: The output current detection circuit includes resistors RS201, R320, R321, R324, R326, R702, R703, R704, a Zener diode ZD702, and an operational amplifier IC302A. The first terminals of resistors RS201 and R324 are connected to the input terminals of the output current detection circuit. The second terminals of resistors RS201 and R321 are grounded. The second terminals of resistors R321 and R320 are connected to the inverting input terminal of the operational amplifier IC302A. The second terminal of resistor R324 is connected to the inverting input terminal of the operational amplifier IC302A. The first terminal of resistor R326 is connected to the non-inverting input of op-amp IC302A. The second terminal of resistor R326 is connected to power supply V1.25V. The second terminal of resistor R320 and the output terminal of op-amp IC302A are connected to the first terminal of resistor R702. The second terminal of resistor R702 is connected to the first terminal of resistor R703, the first terminal of resistor R704 and the negative terminal of Zener diode ZD702. The second terminal of resistor R703 and the positive terminal of Zener diode ZD702 are connected to the input terminal of the output current detection circuit. The second terminal of resistor R704 is connected to the output terminal of the output current detection circuit.

10. The dual-battery high-power automatic switching charging system as described in claim 1, characterized in that: It also includes a first voltage detection circuit, a second voltage detection circuit, and a third voltage detection circuit. The input terminal of the first voltage detection circuit is connected to the Vbat1 pin of the first output port J1, the input terminal of the second voltage detection circuit is connected to the Vbat2 pin of the second output port J2, and the input terminal of the third voltage detection circuit is connected to the output terminal of the switching power supply circuit. The output terminals of the first voltage detection circuit, the second voltage detection circuit, and the third voltage detection circuit are respectively connected to the main control circuit.

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