Intelligent dual charging control circuit of charger

Abstract

The application discloses a kind of intelligent double charging control circuit of charger, it is related to power supply field, the intelligent double charging control circuit of the charger includes: voltage current control module, for detecting the charging support voltage, current of equipment, output square wave signal;Double interface power supply module, for a bus line is divided into two branch lines, two branch lines receive different square wave signals, adjust the voltage, current size of output to two equipment;Power consumption detection module, for detecting the current size on bus line, compared with prior art, the beneficial effects of the application are: two equipment is charged by double charging charger in the application, when the total power of double charging charger is insufficient, two equipment will be controlled to charge alternately, avoid power shortage to cause equipment damage, when the charging power of two equipment changes and makes the total power of double charging charger enough, restore to charge two equipment simultaneously, so that double charging charger guarantees charging safety while also maintaining certain charging speed.

Description

Technical Field

[0001] The present invention relates to the field of power supply, and in particular to an intelligent dual-charging control circuit of a charger. Background Art

[0002] A dual charger, that is, a charger equipped with two charging ports, can charge two devices at the same time, providing a certain convenience.

[0003] The total power of a dual charger is fixed. When charging two devices simultaneously, the power is divided among them. If both devices have high charging requirements, the total power of the dual charger is insufficient, resulting in slow charging and, in severe cases, even damage to the devices. This requires improvement. Summary of the Invention

[0004] The object of the present invention is to provide an intelligent dual-charge control circuit for a charger to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An intelligent dual-charge control circuit for a charger, comprising:

[0007] The voltage and current control module is used to detect the charging support voltage and current of the device and output a square wave signal;

[0008] The dual-interface power supply module is used to divide a main line into two branches. The two branches receive different square wave signals and adjust the voltage and current output to the two devices.

[0009] The power consumption detection module is used to detect the current size on the bus line and determine whether the dual charger is insufficient to supply power to the two devices. If the power is insufficient, it sends a drive signal to control the power consumption control module to work;

[0010] The power control module is used to control the two branch lines to work alternately when receiving a driving signal to reduce power demand; it stops working periodically. After stopping working, if no driving signal is received, that is, the dual charger has sufficient power to supply two devices, the two branch lines are controlled to work simultaneously;

[0011] The output end of the voltage and current control module is connected to the input end of the dual-interface power supply module, the output end of the dual-interface power supply module is connected to the input end of the power detection module, and the output end of the power detection module is connected to the input end of the power control module.

[0012] As a further solution of the present invention: the voltage and current control module includes a single-chip microcomputer, four IO ports of the single-chip microcomputer are connected to the input end of the dual-interface power supply module, and the other two IO ports of the single-chip microcomputer are connected to two different devices through a communication protocol chip respectively.

[0013] As a further solution of the present invention: a dual-interface power supply module includes a first resistor, a first switch, a second switch, a first voltage regulator, a second voltage regulator, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first MOS transistor, a second MOS transistor, a third MOS transistor, and a fourth MOS transistor, one end of the first resistor is connected to a power supply voltage and a common point A1, and the other end of the first resistor is connected to one end of the first switch, one end of the second switch, and a common point A2;

[0014] The other end of the first switch is connected to the input end of the first voltage regulator, the ground end of the first voltage regulator is connected to the D pole of the first MOS tube, one end of the second resistor, and one end of the third resistor, the G pole of the first MOS tube is connected to the output end of the voltage and current control module, the S pole of the first MOS tube is grounded, and the other end of the third resistor is grounded. The output end of the first voltage regulator is connected to the other end of the second resistor, one end of the fourth resistor, and the D pole of the second MOS tube, the other end of the fourth resistor is grounded, the S pole of the second MOS tube is grounded, and the G pole of the second MOS tube is connected to the output end of the voltage and current control module;

[0015] The other end of the second switch is connected to the input end of the second voltage regulator, the ground end of the second voltage regulator is connected to the D pole of the third MOS tube, one end of the fifth resistor, and one end of the sixth resistor, the G pole of the third MOS tube is connected to the output end of the voltage and current control module, the S pole of the third MOS tube is grounded, and the other end of the sixth resistor is grounded. The output end of the second voltage regulator is connected to the other end of the fifth resistor, one end of the seventh resistor, and the D pole of the fourth MOS tube, the other end of the seventh resistor is grounded, the S pole of the fourth MOS tube is grounded, and the G pole of the third MOS tube is connected to the output end of the voltage and current control module.

[0016] As a further solution of the present invention: the power consumption detection module includes an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a third amplifier, a fourth amplifier, a third diode, and a twelfth resistor. One end of the eighth resistor is connected to the common point A1, the other end of the eighth resistor is connected to one end of the ninth resistor and the non-inverting end of the third amplifier, the other end of the ninth resistor is grounded, the inverting end of the third amplifier is connected to one end of the tenth resistor and one end of the eleventh resistor, the other end of the tenth resistor is connected to the common point A2, the other end of the eleventh resistor is connected to the output end of the third amplifier and the inverting end of the fourth amplifier, the non-inverting end of the fourth amplifier is connected to the reference voltage, the output end of the fourth amplifier is connected to the positive pole of the third diode, the negative pole of the third diode is connected to one end of the twelfth resistor, and the other end of the twelfth resistor is grounded.

[0017] As a further solution of the present invention: the power control module includes:

[0018] The working control unit is used to control the two branch lines to work alternately through two time relays when receiving a driving signal, thereby reducing power demand; it stops working periodically. After stopping working, if no driving signal is received, that is, the dual charger has sufficient power to supply two devices, the two branch lines are controlled to work simultaneously;

[0019] A periodic self-check unit is used to start timing when the working control unit is working, and control the working control unit to stop working after the timing time is reached;

[0020] The first input end of the working control unit is connected to the output end of the power detection module, the output end of the working control unit is connected to the input end of the periodic self-test unit, and the output end of the periodic self-test unit is connected to the second input end of the working control unit.

[0021] As a further solution of the present invention: the working control unit includes a thirteenth resistor, a fifth transistor, a first thyristor, a fourteenth resistor, a seventh transistor, a fifteenth resistor, a first time relay, a first diode, a second time relay, and a second diode. One end of the thirteenth resistor is connected to the power supply voltage, and the other end of the thirteenth resistor is connected to the collector of the fifth transistor. The fifth transistor is a photosensitive transistor. The base of the fifth transistor receives a light signal, which is a driving signal. The emitter of the fifth transistor is connected to the control electrode of the first thyristor, and the positive electrode of the first thyristor is connected to the fourteenth resistor. and the collector of the seventh transistor. The other end of the fourteenth resistor is connected to the power supply voltage, the emitter of the seventh transistor is grounded, the base of the seventh transistor is connected to the output end of the periodic self-test unit, the negative electrode of the first thyristor is connected to one end of the fifteenth resistor, the other end of the fifteenth resistor is connected to one end of the first time relay, the negative electrode of the first diode, one end of the second time relay, the negative electrode of the second diode, and the input end of the periodic self-test unit, the other end of the first time relay is grounded, the anode of the first diode is grounded, the other end of the second time relay is grounded, and the positive electrode of the second diode is grounded.

[0022] As a further solution of the present invention: the periodic self-test unit includes a first potentiometer, a sixteenth resistor, a first capacitor, a fourth diode, and a sixth transistor, one end of the first potentiometer is connected to the output end of the working control unit, the other end of the first potentiometer is connected to one end of the sixteenth resistor, the other end of the sixteenth resistor is connected to one end of the first capacitor, the cathode of the fourth diode, and the collector of the sixth transistor, the other end of the first capacitor is grounded, the anode of the fourth diode is connected to the second input end of the working control unit and the base of the sixth transistor, and the emitter of the sixth transistor is grounded.

[0023] Compared with the prior art, the present invention has the following beneficial effects: the present invention charges two devices through a dual charger. When the total power of the dual charger is insufficient, the two devices are controlled to charge alternately to avoid damage to the devices due to insufficient power. When the charging power of the two devices changes so that the total power of the dual charger is sufficient, the two devices are restored to be charged simultaneously, so that the dual charger ensures charging safety while maintaining a certain charging speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a schematic diagram of an intelligent dual-charging control circuit for a charger.

[0025] Figure 2 Schematic diagram of the voltage and current control module.

[0026] Figure 3 This is the circuit diagram of the dual-interface power supply module.

[0027] Figure 4 This is the circuit diagram of the power consumption detection module and the power consumption control module. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] See also Figure 1 , an intelligent dual-charge control circuit for a charger, comprising:

[0030] Voltage and current control module 1, used to detect the charging support voltage and current of the device and output a square wave signal;

[0031] The dual-interface power supply module 2 is used to divide a main line into two branches (the first branch line is from the first switch S1 to the output voltage VOUT1, and the second branch line is from the second switch S2 to the output voltage VOUT2). The two branches receive different square wave signals and adjust the voltage and current output to the two devices;

[0032] The power consumption detection module 3 is used to detect the current size on the bus line and determine whether the dual charger is insufficient to supply power to the two devices. If the power is insufficient, it sends a drive signal to control the power consumption control module 4 to work;

[0033] The power control module 4 is used to control the two branch lines to work alternately when receiving a driving signal to reduce power demand; it stops working periodically. After stopping working, if no driving signal is received, that is, the dual charger has sufficient power to supply two devices, the two branch lines are controlled to work simultaneously;

[0034] The output end of the voltage and current control module 1 is connected to the input end of the dual-interface power supply module 2, the output end of the dual-interface power supply module 2 is connected to the input end of the power detection module 3, and the output end of the power detection module 3 is connected to the input end of the power control module 4.

[0035] In this example: See Figure 2 The voltage and current control module 1 includes a single-chip microcomputer U5. Four IO ports of the single-chip microcomputer U5 are connected to the input end of the dual-interface power supply module 2. The other two IO ports of the single-chip microcomputer U5 are connected to two different devices through a communication protocol chip.

[0036] Specific as Figure 2 As shown, MCU U5's IO5 and IO6 ports are each connected to two different devices via a communication protocol chip, using protocols such as PD (Power Delivery) and QC (Quick Charge). These protocols allow MCU U5 to exchange information with the devices, including the device's charging requirements and maximum supported power. Based on this information, MCU U5 adjusts the four square wave signals (PWM1, PWM2, PWM3, and PWM4) output by ports IO1, IO2, IO3, and IO4 to change the output voltage and current of dual-interface power supply module 2 to meet the device's charging requirements.

[0037] In another embodiment: Here, the IO1, IO2, IO3, IO4, IO5, and IO6 ports of the single-chip microcomputer U5 are taken as examples. In actual use, the use of the IO ports of the single-chip microcomputer U5 is not limited.

[0038] In this example: See Figure 3 The dual-interface power supply module 2 includes a first resistor R1, a first switch S1, a second switch S2, a first voltage regulator U1, a second voltage regulator U2, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first MOS transistor V1, a second MOS transistor V2, a third MOS transistor V3, and a fourth MOS transistor V4. One end of the first resistor R1 is connected to the power supply voltage VCC and a common point A1, and the other end of the first resistor R1 is connected to one end of the first switch S1, one end of the second switch S2, and a common point A2.

[0039] The other end of the first switch S1 is connected to the input end of the first voltage regulator U1, the ground end of the first voltage regulator U1 is connected to the D pole of the first MOS transistor V1, one end of the second resistor R2, and one end of the third resistor R3, the G pole of the first MOS transistor V1 is connected to the output end of the voltage and current control module 1, the S pole of the first MOS transistor V1 is grounded, and the other end of the third resistor R3 is grounded. The output end of the first voltage regulator U1 is connected to the other end of the second resistor R2, one end of the fourth resistor R4, and the D pole of the second MOS transistor V2, the other end of the fourth resistor R4 is grounded, the S pole of the second MOS transistor V2 is grounded, and the G pole of the second MOS transistor V2 is connected to the output end of the voltage and current control module 1;

[0040] The other end of the second switch S2 is connected to the input end of the second voltage regulator U2. The ground end of the second voltage regulator U2 is connected to the D pole of the third MOS transistor V3, one end of the fifth resistor R5, and one end of the sixth resistor R6. The G pole of the third MOS transistor V3 is connected to the output end of the voltage and current control module 1. The S pole of the third MOS transistor V3 is grounded. The other end of the sixth resistor R6 is grounded. The output end of the second voltage regulator U2 is connected to the other end of the fifth resistor R5, one end of the seventh resistor R7, and the D pole of the fourth MOS transistor V4. The other end of the seventh resistor R7 is grounded. The S pole of the fourth MOS transistor V4 is grounded. The G pole of the third MOS transistor V3 is connected to the output end of the voltage and current control module 1.

[0041] The first switch S1 and the second switch S2 are normally closed. After the supply voltage VCC (the supply voltage VCC and the supply current reflect the total power of the dual charger) are input, the first voltage regulator U1 adjusts the resistance ratio between the second resistor R2 and the parallel third resistor R3 and the first MOS transistor V1 based on the conduction status of the first MOS transistor V1 (controlled by PWM1), thereby changing the output voltage VOUT1. Based on the conduction status of the second MOS transistor V2 (controlled by PWM2), the current flowing through the second MOS transistor V2 is adjusted, thereby changing the current output to the device. Therefore, the voltage and current output to one device are changed by the PWM1 and PWM2 signals, and similarly, the voltage and current output to another device are changed by the PWM3 and PWM4 signals.

[0042] In another embodiment: Here, a controllable constant voltage and constant current circuit is illustrated as an example, and other types of constant voltage and constant current circuits can also be used. For example, a dedicated constant current and constant voltage control chip (such as LD8115A, etc.) has constant current and constant voltage control modules integrated inside. Through the setting of external components and the internal control logic of the chip, precise control of the output voltage and output current can be achieved.

[0043] In this example: See Figure 4The power consumption detection module 3 includes an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a third amplifier U3, a fourth amplifier U4, a third diode D3, and a twelfth resistor R12. One end of the eighth resistor R8 is connected to a common point A1, the other end of the eighth resistor R8 is connected to one end of the ninth resistor R9 and the non-inverting end of the third amplifier U3, the other end of the ninth resistor R9 is grounded, the inverting end of the third amplifier U3 is connected to one end of the tenth resistor R10 and one end of the eleventh resistor R11, the other end of the tenth resistor R10 is connected to the common point A2, the other end of the eleventh resistor R11 is connected to the output end of the third amplifier U3 and the inverting end of the fourth amplifier U4, the non-inverting end of the fourth amplifier U4 is connected to the reference voltage VREF, the output end of the fourth amplifier U4 is connected to the anode of the third diode D3, the cathode of the third diode D3 is connected to one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is grounded.

[0044] When the total power of the dual charger is insufficient to power two devices, the current on the bus line will be small, and the resistance value of the first resistor R1 will remain unchanged, that is, the voltage on the first resistor R1 will be small. At this time, the voltage on the first resistor R1 is amplified by the third amplifier U3 and is less than the reference voltage VREF, causing the fourth amplifier U4 to output a high level, triggering the third diode D3 (light-emitting diode) to light up and drive the power control module 4.

[0045] In another embodiment, a voice chip may be added to remind the user when the total power of the dual charger is insufficient.

[0046] In this example: See Figure 4 , the power control module 4 includes:

[0047] The working control unit is used to control the two branch lines to work alternately through two time relays when receiving a driving signal, thereby reducing power demand; it stops working periodically. After stopping working, if no driving signal is received, that is, the dual charger has sufficient power to supply two devices, the two branch lines are controlled to work simultaneously;

[0048] A periodic self-check unit is used to start timing when the working control unit is working, and control the working control unit to stop working after the timing time is reached;

[0049] The first input terminal of the working control unit is connected to the output terminal of the power detection module 3 , the output terminal of the working control unit is connected to the input terminal of the periodic self-test unit, and the output terminal of the periodic self-test unit is connected to the second input terminal of the working control unit.

[0050] In this example: See Figure 4The working control unit includes a thirteenth resistor R13, a fifth transistor V5, a first thyristor Z1, a fourteenth resistor R14, a seventh transistor V7, a fifteenth resistor R15, a first time relay J1, a first diode D1, a second time relay J2, and a second diode D2. One end of the thirteenth resistor R13 is connected to the power supply voltage VCC, and the other end of the thirteenth resistor R13 is connected to the collector of the fifth transistor V5. The fifth transistor V5 is a photosensitive transistor. The base of the fifth transistor V5 receives a light signal, which is a driving signal. The emitter of the fifth transistor V5 is connected to the control electrode of the first thyristor Z1, and the positive electrode of the first thyristor Z1 is connected to the positive electrode of the fourteenth resistor R14. One end of the first time relay J1 is connected to the collector of the seventh transistor V7, the other end of the fourteenth resistor R14 is connected to the power supply voltage VCC, the emitter of the seventh transistor V7 is grounded, the base of the seventh transistor V7 is connected to the output end of the periodic self-test unit, the cathode of the first thyristor Z1 is connected to one end of the fifteenth resistor R15, the other end of the fifteenth resistor R15 is connected to one end of the first time relay J1, the cathode of the first diode D1, one end of the second time relay J2, the cathode of the second diode D2, and the input end of the periodic self-test unit, the other end of the first time relay J1 is grounded, the anode of the first diode D1 is grounded, the other end of the second time relay J2 is grounded, and the anode of the second diode D2 is grounded.

[0051] When the total power of the dual charger is insufficient to power two devices, the third diode D3 emits light, and the fifth transistor V5 receives the optical signal and turns on, triggering the first thyristor Z1 to turn on, so that the first time relay J1 and the second time relay J2 are energized and work. The time relay periodically controls whether the switch is closed or not, for example, controlling the switch to be closed for one minute, then open for one minute, then closed for one minute, and so on. By adjusting the first time relay J1 and the second time relay J2, the first switch S1 and the second switch S2 controlled by the first time relay J1 and the second time relay J2 are alternately opened, that is, when the first switch S1 is closed, the second switch S2 is opened, and when the second switch S2 is closed, the first switch S1 is opened, so that the two branches work alternately, and the total power of the dual charger meets the power demand of a single device.

[0052] In another embodiment, the fifth transistor V5 can be replaced by a conventional transistor (non-photosensitive transistor), and the base collects the voltage signal on the twelfth resistor R12 to select whether to be turned on. The disadvantage is that it is not isolated.

[0053] In this example: See Figure 4The periodic self-test unit includes a first potentiometer RP1, a sixteenth resistor R16, a first capacitor C1, a fourth diode D4, and a sixth transistor V6. One end of the first potentiometer RP1 is connected to the output end of the working control unit, the other end of the first potentiometer RP1 is connected to one end of the sixteenth resistor R16, the other end of the sixteenth resistor R16 is connected to one end of the first capacitor C1, the cathode of the fourth diode D4, and the collector of the sixth transistor V6, the other end of the first capacitor C1 is grounded, the anode of the fourth diode D4 is connected to the second input end of the working control unit and the base of the sixth transistor V6, and the emitter of the sixth transistor V6 is grounded.

[0054] As the two branches work alternately, the battery charging modes of the two devices also begin to change (constant current mode, constant voltage mode, etc.), and the power consumption is also different. Therefore, when the two devices start charging, the total power of the dual charger is not enough to power the two devices. After charging for a period of time, the total power of the dual charger is sufficient to power the two devices.

[0055] While the first thyristor Z1 is turned on, the supply voltage VCC charges the first capacitor C1 through the fourteenth resistor R14, the first thyristor Z1, the fifteenth resistor R15, the first potentiometer RP1, and the sixteenth resistor R16. When the first capacitor C1 is charged enough to turn on the fourth diode D4, the seventh transistor V7 is turned on, the first thyristor Z1 is turned off, the first time relay J1 and the second time relay J2 stop working, the first switch S1 and the second switch S2 are both in the closed state, and the two branches operate simultaneously.

[0056] At this time, if the total power of the dual charger is still insufficient to power two devices, the third diode D3 emits light through the fifth transistor V5, triggering the first thyristor Z1 to turn on again. The first time relay J1 and the second time relay J2 continue to work, waiting for the first capacitor C1 to be charged enough to turn on the fourth diode D4 (at this time, the voltage on the first capacitor C1 has been discharged to ground through the sixth transistor V6), and then periodic detection is performed again.

[0057] At this time, if the total power of the dual charger is sufficient to power two devices, the voltage on the first resistor R1 is larger, so that the voltage at the inverting terminal of the fourth amplifier U4 is higher than the voltage at the non-inverting terminal. The third diode D3 does not emit light, the fifth transistor V5 does not conduct, and the first thyristor Z1 remains in the cut-off state, keeping the two branches working simultaneously.

[0058] In another embodiment, the sixth transistor V6 and the seventh transistor V7 may be replaced with other types of switching transistors.

[0059] The working principle of the present invention is as follows: the voltage and current control module 1 is used to detect the charging support voltage and current of the device and output a square wave signal; the dual-interface power supply module 2 is used to divide a main line into two branch lines, and the two branch lines receive different square wave signals to adjust the voltage and current output to the two devices; the power consumption detection module 3 is used to detect the current size on the main line and determine whether the dual charger is insufficient to supply power to the two devices. When the power is insufficient, a drive signal is sent to control the power consumption control module 4 to work; the power consumption control module 4 is used to control the two branch lines to work alternately when receiving the drive signal to reduce power demand; and periodically stop working. After stopping working, if no drive signal is received, it means that the dual charger has sufficient power to supply power to the two devices, and the two branch lines are controlled to work simultaneously.

[0060] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive.

[0061] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An intelligent dual-charge control circuit for a charger, characterized in that: The charger's intelligent dual-charge control circuit includes: The voltage and current control module is used to detect the charging support voltage and current of the device and output a square wave signal; The dual-interface power supply module is used to divide a main line into two branches. The two branches receive different square wave signals and adjust the voltage and current output to the two devices. The power consumption detection module is used to detect the current size on the bus line and determine whether the dual charger is insufficient to supply power to the two devices. If the power is insufficient, it sends a drive signal to control the power consumption control module to work; The power control module is used to control the two branch lines to work alternately when receiving a driving signal to reduce power demand; it stops working periodically. After stopping working, if no driving signal is received, that is, the dual charger has sufficient power to supply two devices, the two branch lines are controlled to work simultaneously; The output end of the voltage and current control module is connected to the input end of the dual-interface power supply module, the output end of the dual-interface power supply module is connected to the input end of the power detection module, and the output end of the power detection module is connected to the input end of the power control module; The power control module includes: The working control unit is used to control the two branch lines to work alternately through two time relays when receiving a driving signal, thereby reducing power demand; it stops working periodically. After stopping working, if no driving signal is received, that is, the dual charger has sufficient power to supply two devices, the two branch lines are controlled to work simultaneously; A periodic self-check unit is used to start timing when the working control unit is working, and control the working control unit to stop working after the timing time is reached; The first input terminal of the working control unit is connected to the output terminal of the power detection module, the output terminal of the working control unit is connected to the input terminal of the periodic self-test unit, and the output terminal of the periodic self-test unit is connected to the second input terminal of the working control unit; The working control unit includes a thirteenth resistor, a fifth transistor, a first thyristor, a fourteenth resistor, a seventh transistor, a fifteenth resistor, a first time relay, a first diode, a second time relay, and a second diode. One end of the thirteenth resistor is connected to the power supply voltage, and the other end of the thirteenth resistor is connected to the collector of the fifth transistor. The fifth transistor is a photosensitive transistor. The base of the fifth transistor receives a light signal, which is a driving signal. The emitter of the fifth transistor is connected to the control electrode of the first thyristor. The positive electrode of the first thyristor is connected to one end of the fourteenth resistor and the collector of the seventh transistor. The other end of the four resistors is connected to the power supply voltage, the emitter of the seventh transistor is grounded, the base of the seventh transistor is connected to the output end of the periodic self-test unit, that is, the anode of the fourth diode, the cathode of the first thyristor is connected to one end of the fifteenth resistor, the other end of the fifteenth resistor is connected to one end of the first time relay, the cathode of the first diode, one end of the second time relay, the cathode of the second diode, and the input end of the periodic self-test unit, that is, one end of the first potentiometer, the other end of the first time relay is grounded, the anode of the first diode is grounded, the other end of the second time relay is grounded, and the anode of the second diode is grounded; When the total power of the dual charger is insufficient to power two devices, the fifth transistor is turned on, triggering the first thyristor to turn on, causing the first time relay and the second time relay to operate, controlling the corresponding switches to turn on alternately; The periodic self-test unit includes a first potentiometer, a sixteenth resistor, a first capacitor, a fourth diode, and a sixth transistor, one end of the first potentiometer is connected to the output end of the working control unit, that is, the other end of the fifteenth resistor, the other end of the first potentiometer is connected to one end of the sixteenth resistor, the other end of the sixteenth resistor is connected to one end of the first capacitor, the cathode of the fourth diode, and the collector of the sixth transistor, the other end of the first capacitor is grounded, the anode of the fourth diode is connected to the second input end of the working control unit, that is, the base of the seventh transistor and the base of the sixth transistor, and the emitter of the sixth transistor is grounded; While the first thyristor is turned on, the power supply voltage charges the first capacitor through the fourteenth resistor, the first thyristor, the fifteenth resistor, the first potentiometer, and the sixteenth resistor. When the first capacitor is charged enough to turn on the fourth diode, the seventh transistor is turned on, the first thyristor is turned off, the first time relay and the second time relay stop working, and the corresponding switches controlled by the first time relay and the second time relay are closed, and the two branch lines work simultaneously.

2. The intelligent dual-charge control circuit of the charger according to claim 1, characterized in that: The voltage and current control module includes a single-chip microcomputer, four IO ports of the single-chip microcomputer are connected to the input end of the dual-interface power supply module, and the other two IO ports of the single-chip microcomputer are connected to two different devices through a communication protocol chip.

3. The intelligent dual-charge control circuit of the charger according to claim 1 or 2, characterized in that: The dual-interface power supply module includes a first resistor, a first switch, a second switch, a first voltage regulator, a second voltage regulator, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first MOS transistor, a second MOS transistor, a third MOS transistor, and a fourth MOS transistor. One end of the first resistor is connected to the power supply voltage and a common point A1, and the other end of the first resistor is connected to one end of the first switch, one end of the second switch, and a common point A2. The other end of the first switch is connected to the input end of the first voltage regulator, the ground end of the first voltage regulator is connected to the D pole of the first MOS tube, one end of the second resistor, and one end of the third resistor, the G pole of the first MOS tube is connected to the output end of the voltage and current control module, the S pole of the first MOS tube is grounded, and the other end of the third resistor is grounded. The output end of the first voltage regulator is connected to the other end of the second resistor, one end of the fourth resistor, and the D pole of the second MOS tube, the other end of the fourth resistor is grounded, the S pole of the second MOS tube is grounded, and the G pole of the second MOS tube is connected to the output end of the voltage and current control module; The other end of the second switch is connected to the input end of the second voltage regulator, the ground end of the second voltage regulator is connected to the D pole of the third MOS tube, one end of the fifth resistor, and one end of the sixth resistor, the G pole of the third MOS tube is connected to the output end of the voltage and current control module, the S pole of the third MOS tube is grounded, and the other end of the sixth resistor is grounded. The output end of the second voltage regulator is connected to the other end of the fifth resistor, one end of the seventh resistor, and the D pole of the fourth MOS tube, the other end of the seventh resistor is grounded, the S pole of the fourth MOS tube is grounded, and the G pole of the third MOS tube is connected to the output end of the voltage and current control module.

4. The intelligent dual-charge control circuit of the charger according to claim 3, characterized in that: The power consumption detection module includes an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a third amplifier, a fourth amplifier, a third diode, and a twelfth resistor. One end of the eighth resistor is connected to a common point A1, the other end of the eighth resistor is connected to one end of the ninth resistor and the non-inverting end of the third amplifier, the other end of the ninth resistor is grounded, the inverting end of the third amplifier is connected to one end of the tenth resistor and one end of the eleventh resistor, the other end of the tenth resistor is connected to a common point A2, the other end of the eleventh resistor is connected to the output end of the third amplifier and the inverting end of the fourth amplifier, the non-inverting end of the fourth amplifier is connected to a reference voltage, the output end of the fourth amplifier is connected to the positive pole of the third diode, the negative pole of the third diode is connected to one end of the twelfth resistor, and the other end of the twelfth resistor is grounded.

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