Double-battery power supply circuit and corresponding circuit board

Abstract

The utility model provides a double-battery power supply circuit. A first driving module generates a first driving current based on a first power supply current output by a first battery. The second driving module generates a second driving current based on a second power supply current output by the second battery, and the first driving current and the second driving current can provide electric energy for the load. A first control signal output by the first control module can control the first driving module to be switched on and switched off, and a second control signal output by the second control module can control the second driving module to be switched on and switched off. The feedback module generates a first feedback signal and a second feedback signal based on a voltage difference of the first battery and the second battery. The feedback module feeds back a first feedback signal to the first control module, and the first feedback signal can adjust the output duty ratio of the first control signal. The feedback module feeds back a second feedback signal to the second control module, and the second feedback signal can adjust the output duty ratio of the second control signal. The utility model also provides a circuit board.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, and in particular to a dual-battery power supply circuit and a corresponding circuit board. Background Art

[0002] In real life, conventional dual-battery power supply circuits can be powered by connecting two batteries in parallel or in series. However, parallel power supply requires the two batteries to have the same voltage, while series power supply requires the two batteries to have the same charge capacity. Therefore, for products with replaceable batteries, users must replace two batteries with the same voltage or charge capacity at the same time.

[0003] Furthermore, it is inconvenient for users to use products with conventional dual-battery power supply circuits.

[0004] Therefore, it is necessary to provide a dual-battery power supply circuit and a corresponding circuit board to solve the above technical problems. Utility Model Content

[0005] The utility model provides a dual-battery power supply circuit and a corresponding circuit board, which effectively solves the technical problem of the inconvenience of users using products with conventional dual-battery power supply circuits.

[0006] The utility model provides a dual-battery power supply circuit, which includes:

[0007] a first battery, configured to output a first supply current;

[0008] a second battery, configured to output a second supply current;

[0009] a first driving module, configured to generate the first driving current based on the first supply current;

[0010] a second driving module, configured to generate a second driving current based on the second supply current; wherein the first driving current and the second driving current are used to provide electrical energy to a load;

[0011] A first control module, configured to output a first control signal, wherein the first control signal is used to control the first driving module to be turned on and off;

[0012] A second control module, configured to output a second control signal, wherein the second control signal is used to control the second driving module to be turned on and off;

[0013] a feedback module, configured to generate a first feedback signal and a second feedback signal based on a voltage difference between the first battery and the second battery, wherein the feedback module feeds back the first feedback signal to the first control module, and the first feedback signal is used to adjust the output duty cycle of the first control signal; and the feedback module feeds back the second feedback signal to the second control module, and the second feedback signal is used to adjust the output duty cycle of the second control signal;

[0014] When the voltage difference between the first battery and the second battery is greater than 0, the current value of the first driving current is greater than the current value of the second driving current; when the voltage difference between the first battery and the second battery is less than 0, the current value of the first driving current is less than the current value of the second driving current. During the power supply process, the battery with more power will output a larger current than the battery with less power. Therefore, during use, the remaining power of the two batteries gradually approaches the same, and the battery with a higher voltage will output a larger current than the battery with a lower voltage. Therefore, the dual-battery power supply circuit does not need to use two batteries with the same power or voltage.

[0015] Furthermore, the first control module includes a first control chip, the first drive module includes a first MOS driver, a second MOS driver, a first MOS transistor chip, and a second MOS transistor chip, the first control chip includes a first output pin, the first MOS driver includes a first MOS driver input pin and a first MOS driver output pin, and the first MOS transistor chip includes a first MOS transistor chip input pin, a first MOS transistor chip output pin, and a first MOS transistor chip control pin;

[0016] The first output pin is connected to the first MOS driver input pin, the first MOS driver output pin is connected to the first MOS transistor chip control pin, the first MOS transistor chip input pin is connected to the first battery, and the first MOS transistor chip output pin is connected to the load;

[0017] The first control chip further includes a second output pin, the second MOS driver includes a second MOS driver input pin and a second MOS driver output pin, and the second MOS transistor chip includes a second MOS transistor chip input pin, a second MOS transistor chip output pin, and a second MOS transistor chip control pin;

[0018] The second output pin is connected to the second MOS driver input pin, the second MOS driver output pin is connected to the second MOS tube chip control pin, the second MOS tube chip input pin is connected to the first battery, and the second MOS tube chip output pin is connected to the load.

[0019] Furthermore, the second control module includes a second control chip, the second drive module includes a third MOS driver, a fourth MOS driver, a third MOS transistor chip, and a fourth MOS transistor chip, the second control chip includes a third output pin, the second MOS driver includes a third MOS driver input pin and a third MOS driver output pin, and the third MOS transistor chip includes a third MOS transistor chip input pin, a third MOS transistor chip output pin, and a third MOS transistor chip control pin;

[0020] The third output pin is connected to the third MOS driver input pin, the third MOS driver output pin is connected to the third MOS tube chip control pin, the third MOS tube chip input pin is connected to the second battery, and the third MOS tube chip output pin is connected to the load;

[0021] The second control chip further includes a fourth output pin, the fourth MOS driver includes a fourth MOS driver input pin and a fourth MOS driver output pin, and the fourth MOS transistor chip includes a fourth MOS transistor chip input pin, a fourth MOS transistor chip output pin, and a fourth MOS transistor chip control pin;

[0022] The fourth MOS tube chip input pin is connected to the second battery, the fourth output pin is connected to the fourth MOS driver input pin, the fourth MOS driver output pin is connected to the fourth MOS tube chip control pin, the fourth MOS tube chip input pin is connected to the second battery, and the fourth MOS tube chip output pin is connected to the load.

[0023] Furthermore, the feedback module includes a first operational amplifier and a first adjustment unit, the first operational amplifier includes a forward input pin, a reverse input pin, and an amplifier output pin, the forward input pin is connected to the second battery, the reverse input pin is connected to the first battery, one end of the first adjustment unit is connected to the first control chip, and the other end of the first adjustment unit is connected to the amplifier output pin.

[0024] Furthermore, the feedback module includes a second operational amplifier and a second adjustment unit, the second operational amplifier includes a forward input pin, a reverse input pin, and an amplifier output pin, the forward input pin is connected to the first battery, the reverse input pin of the first operational amplifier is connected to the second battery, one end of the second adjustment unit is connected to the second control chip, and the other end of the second adjustment unit is connected to the operational amplifier output pin.

[0025] Furthermore, the first adjustment unit includes a first adjustment resistor and a second adjustment resistor, the first control chip includes a first detection pin and a second detection pin, one end of the first adjustment resistor is connected to the first detection pin, and the other end of the first adjustment resistor is connected to the amplifier output pin, one end of the second adjustment resistor is connected to the second detection pin, and the other end of the second adjustment resistor is connected to the amplifier output pin.

[0026] Furthermore, the second adjustment unit includes a third adjustment resistor and a fourth adjustment resistor, the second control chip includes a third detection pin and a fourth detection pin, one end of the third adjustment resistor is connected to the third detection pin, and the other end of the third adjustment resistor is connected to the amplifier output pin, one end of the fourth adjustment resistor is connected to the fourth detection pin, and the other end of the fourth adjustment resistor is connected to the amplifier output pin.

[0027] Furthermore, the model of the first control chip is LTC3861EUHE, and the model of the second control chip is LTC3861EUHE.

[0028] Furthermore, the dual-battery power supply circuit also includes a chip power supply module, which is connected to the first control chip and the second control chip respectively, and is used to supply power to the first control chip and the second control chip.

[0029] A circuit board comprising the dual-battery power supply circuit according to any one of the above claims.

[0030] Compared to the prior art, the present invention has the following beneficial effects: The present invention provides a dual-battery power supply circuit, comprising a first battery, a second battery, a first drive module, a second drive module, a first control module, a second control module, and a feedback module. Based on the voltage difference between the first battery and the second battery, the feedback module can generate a first feedback signal and a second feedback signal. The first feedback signal can adjust the output duty cycle of the first control signal, and the first control signal can control the on / off timing of the first drive module. Therefore, the first control module can control the on / off timing of the first drive module. Based on the on / off timing of the first drive module, the first control module can further adjust the current value of the first drive current. Furthermore, the second feedback signal can adjust the output duty cycle of the second control signal, and the second control signal can control the on / off timing of the second drive module. Therefore, the second control module can control the on / off timing of the second drive module. Based on the on / off timing of the second drive module, the second control module can further adjust the current value of the second drive current.

[0031] When the voltage difference between the first battery and the second battery is greater than 0, the current value of the first drive current is greater than the current value of the second drive current. When the voltage difference between the first battery and the second battery is less than 0, the current value of the first drive current is less than the current value of the second drive current. Therefore, the battery with a higher charge will output a higher current than the battery with a lower charge. During use, the remaining charge of the two batteries gradually approaches the same, and the dual-battery power supply circuit can use two batteries with different charge levels for power supply. Moreover, in this dual-battery power supply circuit, the battery with a higher voltage will also output a higher current than the battery with a lower voltage. Therefore, when replacing batteries, the dual-battery power supply circuit does not require replacing two batteries with the same charge level or voltage. This effectively solves the technical problem of users being inconvenienced when using products with conventional dual-battery power supply circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. The drawings described below are only drawings corresponding to some embodiments of the present invention.

[0033] Figure 1 This is a block diagram of an embodiment of a dual-battery power supply circuit of the present invention.

[0034] Figure 2 This is a circuit diagram of the first control module and the first drive module of the dual-battery power supply circuit of the present invention.

[0035] Figure 3 This is a circuit diagram of the first control module and the first drive module of the dual-battery power supply circuit of the present invention.

[0036] Figure 4 This is a circuit diagram of the dual-battery power supply circuit feedback module of the present utility model.

[0037] Figure 5 This is a circuit diagram of the chip power supply module of the dual-battery power supply circuit of the present invention.

[0038] Figure 6 This is a circuit diagram of the amplifier power supply module of the dual-battery power supply circuit of the present invention.

[0039] In the figure, 10, dual battery power supply circuit; 11, first battery; 12, second battery; 13, first drive module; 14, second drive module; 15, first control module; 16, second control module; 161, first adjustment unit; 162, second adjustment unit; 17, feedback module; 18, chip power supply module; 181, amplifier power supply module; 19, load. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0041] Directional terms mentioned in this invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "side", "top" and "bottom", are only used with reference to the directions of the drawings. The directional terms used are used to illustrate and understand the invention, and are not intended to limit the invention.

[0042] The terms "first" and "second" in the present invention are used for descriptive purposes only and should not be understood as indicating or implying relative importance, nor as limiting the order of precedence.

[0043] In the figures, structurally similar elements are denoted by the same reference numerals.

[0044] Please refer to Figure 1 The present invention provides a dual-battery power supply circuit 10, which is applied to a circuit board. A first battery 11 in the dual-battery power supply circuit 10 is configured to output a first supply current, and a first driver module 13 is configured to generate a first drive current based on the first supply current. A second battery 12 is configured to output a second supply current, and a second driver module 14 is configured to generate a second drive current based on the second supply current. The first and second drive currents are configured to provide electrical energy to a load 19.

[0045] Please refer to Figure 2The first control module 15 is configured to output a first control signal, which is used to control the on / off switching of the first driver module 13. The first control module 15 includes a first control chip U13, whose model is LTC3861EUHE. The first driver module 13 includes a first MOS driver U19, a second MOS driver U8, a first MOS transistor chip Q15, and a second MOS transistor chip Q10. Both the first MOS driver U19 and the second MOS driver U8 are LTC4449EDCB, and both the first MOS transistor chip Q15 and the second MOS transistor chip Q10 are CSD87353Q5D. The first control chip U13 includes a first output pin PWM1. The first MOS driver U19 includes a first MOS driver input pin IN and a first MOS driver output pin. The first MOS transistor chip Q15 includes a first MOS transistor chip input pin, a first MOS transistor chip output pin, and a first MOS transistor chip control pin. The first MOS transistor chip output pins include VSW1, VSW2, and VSW3. The first MOS transistor chip input pins include VIN1 and VIN2, and the first output pin is connected to the first MOS driver input pin IN. The first MOS driver output pin is connected to the first MOS transistor chip control pin. The first MOS transistor chip input pin is connected to the first battery 11, and the first MOS transistor chip output pin is connected to the load 19. The first MOS driver output pins include TG, TS, and BG pins, and the first MOS transistor chip control pins include TG, TGR, and BG pins. Furthermore, the TG pin of the first MOS driver U19 is connected to the TG pin of the first MOS transistor chip Q15. The TS pin of the first MOS driver U19 is connected to the TGR pin of the first MOS transistor chip Q15. The BG pin of the first MOS driver U19 is connected to the BG pin of the first MOS transistor chip Q15.

[0046] Please refer to Figure 2The first control chip U13 also includes a second output pin. The second MOS driver U8 includes a second MOS driver input pin IN and a second MOS driver output pin. The second MOS transistor chip Q10 includes a second MOS transistor chip input pin, a second MOS transistor chip output pin, and a second MOS transistor chip control pin. The second MOS transistor chip output pins include VSW1, VSW2, and VSW3, and the second MOS transistor chip input pins include VIN1 and VIN2. The second output pin is connected to the second MOS driver input pin IN, and the second MOS driver output pin is connected to the second MOS transistor chip control pin. The second MOS transistor chip input pin is connected to the first battery 11, and the second MOS transistor chip output pin is connected to the load 19. The second MOS driver output pins include TG, TS, and BG, and the second MOS transistor chip control pins include TG, TGR, and BG. Furthermore, the TG pin of the second MOS driver U8 is connected to the TG pin of the second MOS transistor chip Q10. The TS pin of the second MOS driver U8 is connected to the TGR pin of the second MOS transistor chip Q10. The BG pin of the second MOS driver U8 is connected to the BG pin of the second MOS transistor chip Q10.

[0047] Please refer to Figure 2 , the first control chip U13 also includes a VCC pin, a TRACK / SS1 pin, a VINSNS pin, a CONFIG pin, an IAVG pin, a PGOOD1 pin, and a PWMEN1 pin. The first control module 15 includes a first capacitor C125, a second capacitor C131, a third capacitor C536, and a fourth capacitor C130. The first control module 15 also includes a first resistor R191. The VCC pin is connected to the chip power supply module 18, one end of the first capacitor is connected to the VCC pin, and the other end of the first capacitor is grounded. The capacitive reactance of the first capacitor is 0.1μF, and the withstand voltage of the first capacitor is 50V. One end of the second capacitor is connected to the TRACK / SS1 pin, and the other end of the second capacitor is grounded. The capacitive reactance of the second capacitor is 0.1μF, and the withstand voltage of the second capacitor is 50V. The VINSNS pin is connected to the first battery 11, one end of the third capacitor is connected to the VINSNS pin, and the other end of the third capacitor is grounded. The capacitive reactance of the third capacitor is 220μF, and the withstand voltage of the third capacitor is 35V. One end of the first resistor is connected to the PGOOD1 pin, and the other end is connected to the chip power supply unit. The resistance of the first resistor is 100 kΩ. One end of the fourth capacitor is connected to the IAVG pin, and the other end of the fourth capacitor is grounded. The capacitive reactance of the fourth capacitor is 100 pF, and the withstand voltage of the fourth capacitor is 50 V. The CONFIG pin and the PWMEN1 pin are left floating.

[0048] Please refer to Figure 2, the first control chip U13 also includes an FB1 pin, a COMP1 pin, a VSNSP1 pin, a VSNSN1 pin, a VSNSOUT1 pin, a COMP2 pin, and an FB2 pin. Among them, the FB1 pin is connected to the COMP1 pin and the VSNSOUT1 pin, and the FB2 pin is connected to the chip power supply module 18. The COMP2 pin and the COMP1 pin are usually connected to a reference voltage source or an external capacitor to adjust the output voltage of the chip and maintain the stability of the output voltage. The first control module 15 also includes a second resistor R173, a fifth capacitor C119, and a sixth capacitor C114. One end of the second resistor R173 is connected to the FB1 pin, and the other end of the second resistor R173 is connected to the fifth capacitor C119. The fifth capacitor C119 is connected to the COMP1 pin, and the resistance of the second resistor R173 is 25kΩ. The capacitive reactance of the fifth capacitor C119 is 2200pF, and the withstand voltage of the fifth capacitor C119 is 25V. One end of the sixth capacitor C114 is connected to the FB1 pin, and the other end of the sixth capacitor C114 is connected to the COMP1 pin. The capacitive reactance of the fifth capacitor C119 is 470 pF, and the withstand voltage of the fifth capacitor C119 is 50 V.

[0049] Please refer to Figure 2 The first control module 15 also includes a third resistor R166, a fourth resistor R165, and a seventh capacitor C104. One end of the third resistor R166 is connected to the FB1 pin, and the other end of the third resistor R166 is connected to the seventh capacitor C104. The seventh capacitor C104 is connected to the VSNSOUT1 pin. The third resistor R166 has a resistance of 280Ω. The seventh capacitor C104 has a capacitive reactance of 300pF and a withstand voltage of 25V. One end of the fourth resistor R165 is connected to the FB1 pin, and the other end of the fourth resistor R165 is connected to the VSNSOUT1 pin. The fourth resistor R165 has a resistance of 10kΩ.

[0050] Please refer to Figure 2 The first control module 15 also includes a fifth resistor R159, a sixth resistor R158, and a seventh resistor R822. The fifth resistor R159 is connected to the VSNSP1 pin, one end of the sixth resistor R158 is connected to the VSNSP1 pin, and the other end of the sixth resistor R158 is connected to the VSNSN1 pin. The resistance of the fifth resistor R159 is 78.6 kΩ, and the resistance of the sixth resistor R158 is 10 kΩ. One end of the seventh resistor R822 is connected to the pin, and the other end of the seventh resistor R822 is grounded. The resistance of the seventh resistor R822 is 10Ω. The first control chip U13 also includes the VSNSOUT2 pin, the VSNSN2 pin, and the VSNSP2 pin, wherein the VSNSOUT2 pin, the VSNSN2 pin, and the VSNSP2 pin are all floating.

[0051] Please refer to Figure 2 The first control chip U13 also includes a TRACK / SS2 pin and a GND pin, and the GND pin is grounded. The TRACK / SS2 pin is connected to the TRACK / SS1 pin of the first control chip U13, and the TRACK / SS1 pin and the TRACK / SS2 pin can be used to adjust the soft start on time or track two or more power supplies during startup. The first control chip U13 also includes a FREQ pin and a CLKOUT pin, and the CLKOUT pin can be used to output a clock signal. If the CLKOUT pin is connected to an oscilloscope, the clock frequency of the chip can be seen through the oscilloscope. The first control chip U13 also includes a CLKIN pin, a PHSMD pin, a PGOOD2 pin, and a PWMEN2 pin. The CLKIN pin, the PHSMD pin, the PGOOD2 pin, and the PWMEN2 pin are all left floating. The first control module 15 also includes a sixteenth resistor R121, and the resistance of the sixteenth resistor R121 is 34kΩ. One end of the sixteenth resistor R121 is connected to the FREQ pin, and the other end of the sixteenth resistor R121 is grounded.

[0052] Please refer to Figure 2 The first control chip U13 further includes a RUN1 pin, a RUN2 pin, an ILIM2 pin, an ILIM1 pin, and an SGND pin, wherein the SGND pin is grounded. The first control module 15 further includes an eighth resistor R172 and a ninth resistor R116. One end of the eighth resistor R172 is connected to the ILIM1 pin, and the other end of the eighth resistor R172 is grounded. The resistance of the eighth resistor R172 is 68 kΩ. One end of the ninth resistor R116 is connected to the RUN1 pin, and the other end of the ninth resistor R116 is connected to the chip power supply module 18. The resistance of the ninth resistor R116 is 4.7 kΩ. In addition, the RUN2 pin and the ILIM2 pin are both connected to the chip power supply module 18.

[0053] Please refer to Figure 2The first control chip U13 also includes a first detection pin ISNS1P, a second detection pin ISNS2P, an SNS1N pin, and an ISNS2N pin. The first detection pin ISNS1P is connected to the output pin of the first MOSFET chip Q15 and the amplifier output pin OUTA of the first operational amplifier U9A, and the SNS1N pin is connected to the load 19. The second detection pin ISNS2P is connected to the output pin of the second MOSFET chip Q10 and the amplifier output pin OUTA of the first operational amplifier U9A, and the SNS2N pin is connected to the load 19. The first control module 15 also includes an eighth capacitor C113 and a ninth capacitor C95. The capacitive reactance of the eighth capacitor C113 is 0.22 μF. One end of the eighth capacitor C113 is connected to the first detection pin ISNS1P, and the other end of the eighth capacitor C113 is connected to the SNS1N pin. One end of the ninth capacitor C95 is connected to the second detection pin ISNS2P, and the other end of the ninth capacitor C95 is connected to the SNS2N pin. The capacitive reactance of the ninth capacitor C95 is 0.22 μF.

[0054] Please refer to Figure 2 The first driving module 13 includes a tenth capacitor C149, an eleventh capacitor C174, a first diode D20 and a tenth resistor R219, and the first MOS driver U19 includes a Vlogic pin, a BOOST pin and a VCC pin. The VCC pin is connected to the chip power supply module 18, the positive electrode of the first diode D20 is connected to the VCC pin, and the negative electrode of the first diode D20 is connected to the BOOST pin. One end of the tenth capacitor C149 is connected to the VCC pin, and the other end of the tenth capacitor C149 is grounded. The capacitive reactance of the tenth capacitor C149 is 10μF, and the withstand voltage of the tenth capacitor C149 is 10V. One end of the eleventh capacitor C174 is connected to the Vlogic pin, and the other end of the eleventh capacitor C174 is grounded. The capacitive reactance of the eleventh capacitor C174 is 10μF, and the withstand voltage of the eleventh capacitor C174 is 35V. One end of the tenth resistor R219 is connected to the VCC pin, and the other end of the tenth resistor R219 is connected to the Vlogic pin. The resistance of the tenth resistor R219 is 2.2Ω.

[0055] Please refer to Figure 2The first driver module 13 includes a twelfth capacitor C142, a first voltage-stabilizing diode D66, and an eleventh resistor R219. The resistance of the eleventh resistor R219 is 10Ω. One end of the eleventh resistor R219 is connected to the twelfth capacitor C142, and the other end of the eleventh resistor R219 is connected to the first MOS driver output pin, which is the TG pin of the first MOS driver U19. The twelfth capacitor C174 is connected to the negative electrode of the first voltage-stabilizing diode D66, and the positive electrode of the first voltage-stabilizing diode D66 is grounded. The first driver module 13 includes a thirteenth capacitor C141, a twelfth resistor R164, a fourteenth capacitor C103, a fifteenth capacitor C533, and a first inductor L14. One end of the first inductor L14 is connected to the output pin of the first MOS transistor chip, and the other end of the first inductor L14 is connected to the load 19. One end of the twelfth resistor R164 is connected to the first detection pin ISNS1P, and the other end of the twelfth resistor R164 is connected to the first inductor L14. The resistance of the twelfth resistor R164 is 2.1 kΩ. One end of the thirteenth capacitor C141 is connected to the input pin of the first MOS transistor chip, and the other end of the thirteenth capacitor C141 is grounded. The capacitive reactance of the thirteenth capacitor C174 is 0.1 μF. One end of the fourteenth capacitor C103 is connected between the first inductor L14 and the load 19, and the other end of the fourteenth capacitor C103 is grounded. The capacitive reactance of the fourteenth capacitor C103 is 0.1 μF. One end of the fifteenth capacitor C533 is connected between the first inductor L14 and the load 19, and the other end of the fifteenth capacitor C533 is grounded. The capacitive reactance of the fifteenth capacitor C533 is 470 μF.

[0056] Please refer to Figure 2 The first driving module 13 includes a sixteenth capacitor C31, a seventeenth capacitor C40, a second diode D17 and a thirteenth resistor R76, and the second MOS driver U8 includes a Vlogic pin, a BOOST pin and a VCC pin. The VCC pin is connected to the chip power supply module 18, the positive electrode of the second diode D17 is connected to the VCC pin, and the negative electrode of the second diode D17 is connected to the BOOST pin. One end of the sixteenth capacitor C31 is connected to the VCC pin, and the other end of the sixteenth capacitor C31 is grounded. The capacitive reactance of the sixteenth capacitor C31 is 10μF, and the withstand voltage of the sixteenth capacitor C31 is 10V. One end of the seventeenth capacitor C40 is connected to the Vlogic pin, and the other end of the seventeenth capacitor C40 is grounded. The capacitive reactance of the seventeenth capacitor C40 is 10μF, and the withstand voltage of the seventeenth capacitor C40 is 35V. One end of the thirteenth resistor R76 is connected to the VCC pin, and the other end of the thirteenth resistor R76 is connected to the Vlogic pin. The resistance of the thirteenth resistor R76 is 2.2Ω.

[0057] Please refer to Figure 2The first driver module 13 includes an 18th capacitor C30, a second voltage-stabilizing diode D65, and a 14th resistor R841. The resistance of the 14th resistor R841 is 10Ω. One end of the 14th resistor R841 is connected to the 18th capacitor C30, and the other end of the 14th resistor R841 is connected to the second MOS driver output pin, which is the TS pin of the second MOS driver U8. The 18th capacitor C30 is connected to the negative electrode of the second voltage-stabilizing diode D65, and the positive electrode of the second voltage-stabilizing diode D65 is grounded. The first driver module 13 includes a 19th capacitor C36, a 15th resistor R142, a 20th capacitor C91, a 21st capacitor C520, and a second inductor L7. One end of the second inductor L7 is connected to the output pin of the second MOS transistor chip, and the other end of the second inductor L7 is connected to the load 19. One end of the 19th capacitor C36 is connected to the input pin of the first MOS transistor chip, and the other end of the 19th capacitor C36 is grounded. The capacitive reactance of the 19th capacitor C36 is 0.1μF. One end of the 20th capacitor C91 is connected between the second inductor L7 and the load 19, and the other end of the 20th capacitor C91 is grounded. The capacitive reactance of the 20th capacitor C91 is 0.1 μF. One end of the 21st capacitor C520 is connected between the second inductor L7 and the load 19, and the other end of the 21st capacitor C520 is grounded. The capacitive reactance of the 21st capacitor C520 is 470 μF.

[0058] Please refer to Figure 3The second control module 16 outputs a second control signal, which is used to control the conduction and disconnection of the second driver module 14. The second control module 16 includes a second control chip U12, the model of which is LTC3861EUHE. The second driver module 14 includes a third MOS driver U10, a fourth MOS driver U15, a third MOS transistor chip Q9, and a fourth MOS transistor chip Q14. The models of the third MOS driver U10 and the fourth MOS driver U15 are both LTC4449EDCB, and the models of the third MOS transistor chip Q9 and the fourth MOS transistor chip Q14 are both CSD87353Q5D. The second control chip U12 includes a third output pin. The second MOS driver U8 includes a third MOS driver input pin IN and a third MOS driver output pin. The third MOS transistor chip Q9 includes a third MOS transistor chip input pin, a third MOS transistor chip output pin, and a third MOS transistor chip control pin. The third MOS transistor chip input pins include VIN1 and VIN2, and the third MOS transistor chip output pins include VSW1, VSW2, and VSW3. The third output pin is connected to the third MOS driver input pin IN, and the third MOS driver output pin is connected to the third MOS transistor chip control pin. The third MOS transistor chip input pin is connected to the second battery 12, and the third MOS transistor chip output pin is connected to the load 19. The third MOS driver output pins include the TG pin, the TS pin, and the BG pin, and the third MOS transistor chip control pins include the TG pin, the TGR pin, and the BG pin. Furthermore, the TG pin of the third MOS driver U10 is connected to the TG pin of the third MOS transistor chip Q9. The TS pin of the third MOS driver U10 is connected to the TGR pin of the first MOS transistor chip Q15. The BG pin of the third MOS driver U10 is connected to the BG pin of the third MOS transistor chip Q9.

[0059] Please refer to Figure 3The second control chip U12 also includes a fourth output pin. The fourth MOS driver U15 includes a fourth MOS driver input pin IN and a fourth MOS driver output pin. The fourth MOS transistor chip Q14 includes a fourth MOS transistor chip input pin, a fourth MOS transistor chip output pin, and a fourth MOS transistor chip control pin. The fourth MOS transistor chip output pins include VSW1, VSW2, and VSW3, and the fourth MOS transistor chip input pins include VIN1 and VIN2. The fourth MOS transistor chip input pin is connected to the second battery 12, and the fourth output pin is connected to the fourth MOS driver input pin IN. The fourth MOS driver output pin is connected to the fourth MOS transistor chip control pin, the fourth MOS transistor chip input pin is connected to the second battery 12, and the fourth MOS transistor chip output pin is connected to the load 19. The fourth MOS driver output pins include TG, TS, and BG, and the fourth MOS transistor chip control pins include TG, TGR, and BG. Furthermore, the TG pin of the fourth MOS driver U15 is connected to the TG pin of the first MOS transistor chip Q15. The TS pin of the first MOS driver U19 is connected to the TGR pin of the fourth MOS transistor chip Q14. The BG pin of the fourth MOS driver U15 is connected to the BG pin of the fourth MOS transistor chip Q14.

[0060] Please refer to Figure 3 , the second control chip U12 also includes a VCC pin, a TRACK / SS1 pin, a VINSNS pin, a CONFIG pin, an IAVG pin, a PGOOD1 pin, and a PWMEN1 pin. The first control module 15 includes a twenty-second capacitor C67, a twenty-third capacitor C68, a twenty-fourth capacitor C523, and a twenty-fifth capacitor C69. The VCC pin is connected to the chip power supply module 18, one end of the twenty-second capacitor C125 is connected to the VCC pin, and the other end of the twenty-second capacitor C125 is grounded. The capacitive reactance of the first capacitor is 0.1μF, and the withstand voltage of the first capacitor is 50V. One end of the twenty-third capacitor C68 is connected to the TRACK / SS1 pin, and the other end of the twenty-third capacitor C68 is grounded. The capacitive reactance of the twenty-third capacitor C68 is 0.1μF, and the withstand voltage of the twenty-third capacitor C68 is 50V. The VINSNS pin is connected to the first battery 11, one end of the third capacitor is connected to the VINSNS pin, and the other end of the twenty-fourth capacitor C523 is grounded. The capacitive reactance of the 24th capacitor C523 is 220 μF, and the withstand voltage of the 24th capacitor C523 is 35 V. One end of the 25th capacitor C69 is connected to the IAVG pin, and the other end of the 25th capacitor C69 is grounded. The capacitive reactance of the 25th capacitor C69 is 100 pF, and the withstand voltage of the first capacitor is 50 V. In addition, the PGOOD1 pin, the CONFIG pin, and the PWMEN1 pin are left floating.

[0061] Please refer to Figure 3 The second control chip U12 also includes the FB1 pin, COMP1 pin, VSNSP1 pin, VSNSN1 pin, VSNSOUT1 pin, VSNSOUT2 pin, VSNSN2 pin, VSNSP2 pin, COMP2 pin, and FB2 pin. The VSNSP1 pin, VSNSN1 pin, VSNSOUT1 pin, VSNSOUT2 pin, VSNSN2 pin, and VSNSP2 pin are all left floating. The COMP2 pin and COMP1 pin are typically connected to a reference voltage source or an external capacitor to adjust the chip's output voltage and maintain output voltage stability. Furthermore, the FB1 pin and FB2 pin are both connected to the chip power supply module 18.

[0062] Please refer to Figure 3 The second control chip U12 also includes a GND pin and a TRACK / SS2 pin, and the GND pin is grounded. The TRACK / SS2 pin is connected to the TRACK / SS1 pin of the second control chip U12. The TRACK / SS1 pin and the TRACK / SS2 pin can be used to adjust the soft start on time or track two or more power supplies during startup. The second control chip U12 also includes a FREQ pin and a CLKOUT pin. The CLKOUT pin can be used to output a clock signal. If the CLKOUT pin is connected to an oscilloscope, the clock frequency of the chip can be seen through the oscilloscope. The first control chip U13 also includes a CLKIN pin, a PHSMD pin, a PGOOD2 pin, and a PWMEN2 pin. The CLKIN pin, the PHSMD pin, the PGOOD2 pin, and the PWMEN2 pin are all left floating. The second control module 16 also includes a seventeenth resistor R180, and the resistance of the seventeenth resistor R180 is 34kΩ. One end of the seventeenth resistor R180 is connected to the FREQ pin, and the other end of the seventeenth resistor R180 is grounded.

[0063] Please refer to Figure 3 The second control chip U12 further includes a RUN1 pin, a RUN2 pin, an ILIM2 pin, an ILIM1 pin, and an SGND pin, wherein the SGND pin is grounded. The second control module 16 further includes an eighteenth resistor R112 and a nineteenth resistor R170. One end of the eighteenth resistor R112 is connected to the ILIM1 pin, and the other end of the eighteenth resistor R112 is grounded. The resistance of the eighteenth resistor R112 is 68 kΩ. One end of the nineteenth resistor R170 is connected to the RUN1 pin, and the other end of the nineteenth resistor R170 is connected to the chip power supply module 18. The resistance of the nineteenth resistor R170 is 4.7 kΩ. In addition, the RUN2 pin and the ILIM2 pin are both connected to the chip power supply module 18.

[0064] Please refer to Figure 3 The second control chip U12 also includes a third detection pin ISNS1P, a fourth detection pin ISNS2P, an SNS1N pin, and an ISNS2N pin. The third detection pin ISNS1P is connected to the output pin of the third MOS transistor Q9 chip and the amplifier output pin OUTB of the second operational amplifier U9B, and the SNS1N pin is connected to the load 19. The fourth detection pin ISNS2P is connected to the output pin of the fourth MOS transistor chip Q14 and the amplifier output pin OUTB of the second operational amplifier U9B, and the SNS2N pin is connected to the load 19. The second control module 16 also includes a twenty-sixth capacitor C88 and a twenty-seventh capacitor C97. The capacitive reactance of the twenty-sixth capacitor C88 is 0.22 μF. One end of the twenty-sixth capacitor C88 is connected to the third detection pin ISNS1P, and the other end of the twenty-sixth capacitor C88 is connected to the SNS1N pin. One end of the twenty-seventh capacitor C97 is connected to the fourth detection pin ISNS2P, and the other end of the twenty-seventh capacitor C97 is connected to the SNS2N pin. The capacitive reactance of the twenty-seventh capacitor C97 is 0.22 μF. The dual battery power supply circuit 10 further includes a fifty-first resistor R823 having a resistance of 10Ω. One end of the fifty-first resistor R823 is connected to the VSNSP1 pin of the first control chip U13 , and the other end of the fifty-first resistor R823 is connected to the load 19 .

[0065] Please refer to Figure 3 The second driving module 14 includes a twenty-eighth capacitor C51, a twenty-ninth capacitor C39, a third diode D18 and a twentieth resistor R81, and the third MOS driver U10 includes a Vlogic pin, a BOOST pin and a VCC pin. The VCC pin is connected to the chip power supply module 18, the positive electrode of the first diode D20 is connected to the VCC pin, and the negative electrode of the first diode D20 is connected to the BOOST pin. One end of the twenty-eighth capacitor C51 is connected to the VCC pin, and the other end of the twenty-eighth capacitor C51 is grounded. The capacitive reactance of the twenty-eighth capacitor C51 is 10μF, and the withstand voltage of the twenty-eighth capacitor C51 is 10V. One end of the twenty-ninth capacitor C39 is connected to the Vlogic pin, and the other end of the twenty-ninth capacitor C39 is grounded. The capacitive reactance of the twenty-ninth capacitor C39 is 10μF, and the withstand voltage of the twenty-ninth capacitor C39 is 35V. One end of the twentieth resistor R81 is connected to the VCC pin, and the other end of the twentieth resistor R81 is connected to the Vlogic pin. The resistance of the twentieth resistor R81 is 2.2Ω.

[0066] Please refer to Figure 3The second driver module 14 includes a 30th capacitor C53, a third voltage-stabilizing diode D63, and a 21st resistor R839. The 11th resistor R219 has a resistance of 10Ω. One end of the 21st resistor R839 is connected to the 30th capacitor C53, and the other end of the 21st resistor R839 is connected to the third MOS driver output pin, which is the TS pin of the third MOS driver U10. The 30th capacitor C53 is connected to the negative electrode of the third voltage-stabilizing diode D63, and the positive electrode of the third voltage-stabilizing diode D63 is grounded. The second driver module 14 includes a 31st capacitor C23, a 22nd resistor R128, a 32nd capacitor C74, a 33rd capacitor C517, and a third inductor L6. One end of the third inductor L6 is connected to the output pin of the third MOS transistor chip, and the other end of the third inductor L6 is connected to the load 19. One end of the 22nd resistor R128 is connected to the third detection pin ISNS1P, and the other end of the 22nd resistor R128 is connected to the third inductor L6. The resistance of the 22nd resistor R128 is 2.1kΩ. One end of the 31st capacitor C23 is connected to the input pin of the third MOS transistor chip, and the other end of the 31st capacitor C23 is grounded. The capacitive reactance of the 31st capacitor C23 is 0.1 μF. One end of the 32nd capacitor C74 is connected between the third inductor L6 and the load 19, and the other end of the 32nd capacitor C74 is grounded. The capacitive reactance of the 32nd capacitor C74 is 0.1 μF. One end of the 33rd capacitor C517 is connected between the third inductor L6 and the load 19, and the other end of the 33rd capacitor C517 is grounded. The capacitive reactance of the 33rd capacitor C517 is 470 μF.

[0067] Please refer to Figure 3 The second drive module 14 includes a thirty-fourth capacitor C169, a thirty-fifth capacitor C145, a fourth diode D22, and a twenty-third resistor R210. The fourth MOS driver U15 includes a Vlogic pin, a BOOST pin, and a VCC pin. The VCC pin is connected to the chip power supply module 18, the positive electrode of the fourth diode D22 is connected to the VCC pin, and the negative electrode of the fourth diode D22 is connected to the BOOST pin. One end of the thirty-fourth capacitor C169 is connected to the VCC pin, and the other end of the thirty-fourth capacitor C169 is grounded. The capacitive reactance of the thirty-fourth capacitor C169 is 10μF, and the withstand voltage of the thirty-fourth capacitor C169 is 10V. One end of the thirty-fifth capacitor C145 is connected to the Vlogic pin, and the other end of the thirty-fifth capacitor C145 is grounded. The capacitive reactance of the thirty-fifth capacitor C145 is 10μF, and the withstand voltage of the thirty-fifth capacitor C145 is 35V. One end of the twenty-third resistor R210 is connected to the VCC pin, and the other end of the twenty-third resistor R210 is connected to the Vlogic pin. The resistance of the twenty-third resistor R210 is 2.2Ω.

[0068] Please refer to Figure 3The second driver module 14 includes a thirty-sixth capacitor C71, a fourth voltage-stabilizing diode D64, and a twenty-fourth resistor R840. The resistance of the eleventh resistor R219 is 10Ω. One end of the twenty-fourth resistor R840 is connected to the thirty-sixth capacitor C71, and the other end of the twenty-fourth resistor R840 is connected to the third MOS driver output pin, which is the TS pin of the fourth MOS driver U15. The thirty-sixth capacitor C71 is connected to the negative electrode of the fourth voltage-stabilizing diode D64, and the positive electrode of the fourth voltage-stabilizing diode D64 is grounded. The second driver module 14 includes a thirty-seventh capacitor C158, a twenty-fifth resistor R156, a thirty-eighth capacitor C98, a thirty-ninth capacitor C530, and a fourth inductor L11. One end of the fourth inductor L11 is connected to the output pin of the fourth MOS transistor chip, and the other end of the fourth inductor L11 is connected to the load 19. One end of the twenty-fifth resistor R156 is connected to the third detection pin ISNS1P, and the other end of the twenty-fifth resistor R156 is connected to the fourth inductor L11. The resistance of the twenty-fifth resistor R156 is 2.1 kΩ. One end of the thirty-seventh capacitor C158 is connected to the input pin of the fourth MOS transistor chip, and the other end of the thirty-seventh capacitor C158 is grounded. The capacitive reactance of the thirty-seventh capacitor C158 is 0.1 μF. One end of the thirty-eighth capacitor C98 is connected between the fourth inductor L11 and the load 19, and the other end of the thirty-eighth capacitor C98 is grounded. The capacitive reactance of the thirty-eighth capacitor C98 is 0.1 μF. One end of the thirty-ninth capacitor C530 is connected between the fourth inductor L11 and the load 19, and the other end of the thirty-ninth capacitor C530 is grounded. The capacitive reactance of the thirty-ninth capacitor C530 is 470 μF.

[0069] Please refer to Figure 1 Based on the voltage difference between the first battery 11 and the second battery 12, the feedback module 17 generates a first feedback signal and a second feedback signal. The feedback module 17 feeds the first feedback signal back to the first control module 15. The first feedback signal is used to adjust the output duty cycle of the first control signal. The feedback module 17 feeds the second feedback signal back to the second control module 16. The second feedback signal is used to adjust the output duty cycle of the second control signal.

[0070] Please refer to Figure 4The feedback module 17 includes a first operational amplifier U9A and a first adjustment unit 161. The first operational amplifier U9A includes a positive input pin +INA, a negative input pin -INA, and an amplifier output pin OUTA. The positive input pin +INA is connected to the second battery 12, and the negative input pin -INA is connected to the first battery 11. One end of the first adjustment unit 161 is connected to the first control chip U13, and the other end of the first adjustment unit 161 is connected to the amplifier output pin OUTA. The feedback module 17 includes a second operational amplifier U9B and a second adjustment unit 162. The second operational amplifier U9B includes a positive input pin +INB, a negative input pin -INB, and an amplifier output pin OUTB. The positive input pin +INB is connected to the first battery 11, and the negative input pin -INB is connected to the second battery 12. One end of the second adjustment unit 162 is connected to the second control chip U12, and the other end of the second adjustment unit 162 is connected to the amplifier output pin OUTB.

[0071] Please refer to Figure 2 、 Figure 3 and Figure 4 The first adjustment unit 161 includes a first adjustment resistor R847 and a second adjustment resistor R848. One end of the first adjustment resistor R847 is connected to the first detection pin ISNS1P, and the other end of the first adjustment resistor R847 is connected to the amplifier output pin OUTA. One end of the second adjustment resistor R848 is connected to the second detection pin ISNS2P, and the other end of the second adjustment resistor R848 is connected to the amplifier output pin OUTA. The second adjustment unit 162 includes a third adjustment resistor R849 and a fourth adjustment resistor R850. The second control chip U12 includes a third detection pin and a fourth detection pin. One end of the third adjustment resistor R849 is connected to the third detection pin ISNS1P, and the other end of the third adjustment resistor R849 is connected to the amplifier output pin OUTA. One end of the fourth adjustment resistor R850 is connected to the fourth detection pin ISNS2P, and the other end of the fourth adjustment resistor R850 is connected to the amplifier output pin OUTB.

[0072] The user can adjust the resistance values ​​of the first adjustment resistor R847, the second adjustment resistor R848, the third adjustment resistor R849, and the fourth adjustment resistor R850. This allows the user to adjust the magnitude of the first and second drive currents, based on the maximum voltage difference between the two batteries. The larger the resistance values ​​of the first and second adjustment resistors R847 and R848, the smaller the first drive current. The smaller the resistance values ​​of the first and second adjustment resistors R847 and R848, the larger the first drive current. Furthermore, the larger the resistance values ​​of the third and fourth adjustment resistors R849 and R850, the smaller the second drive current. The smaller the resistance values ​​of the third and fourth adjustment resistors R849 and R850, the larger the second drive current. The user first selects the appropriate resistance values ​​for the first, second, third, and fourth adjustment resistors R847, R848, R849, and R850. Then, the user selects two batteries with a nominal voltage of 12V. The actual voltages of the two batteries are 14.8V and 10.8V, respectively. Subsequently, the user used these two batteries for testing, and the test results showed that the output current of the 14.8V battery was 10A, and the output current of the 10.8V battery was 1A.

[0073] Please refer to Figure 4 The feedback module 17 also includes a fifth diode D55, a sixth diode D54, a fortieth capacitor C1080, a twenty-sixth resistor R89, and a twenty-seventh resistor R831. The anode of the fifth diode D55 is connected to the amplifier output pin, and the cathode of the fifth diode D55 is connected to the load 19. The anode of the sixth diode D54 is connected to the load 19, and the cathode of the sixth diode D54 is connected to the amplifier output pin OUTA. One end of the fortieth capacitor C1080 is connected to the amplifier output pin OUTA, and the other end of the fortieth capacitor C1080 is connected to the load 19. The capacitive reactance of the fortieth capacitor C1080 is 0.22 μF. One end of the twenty-sixth resistor R89 ​​is connected to the first adjustment resistor R847, and the other end of the twenty-sixth resistor R89 ​​is connected to the amplifier output pin OUTA. The resistance of the twenty-sixth resistor R89 ​​is 10 kΩ. One end of the twenty-seventh resistor R831 is connected to the amplifier output pin OUTA, and the other end of the twenty-seventh resistor R831 is grounded. The resistance of the twenty-seventh resistor R831 is 5.1 kΩ.

[0074] Please refer to Figure 4The feedback module 17 also includes a forty-first capacitor C48, a twenty-eighth resistor R90, a twenty-ninth resistor R78, a thirtieth resistor R67, and a thirty-first resistor R60. One end of the forty-first capacitor C48 is connected to the amplifier output pin OUTA, and the other end of the forty-first capacitor C48 is connected to the inverting input pin -INA. The capacitive reactance of the forty-first capacitor C48 is 470pF, and the withstand voltage of the forty-first capacitor C48 is 50V. One end of the twenty-eighth resistor R90 is connected to the amplifier output pin OUTA, and the other end of the twenty-eighth resistor R90 is connected to the inverting input pin -INA. The resistance of the twenty-eighth resistor R90 is 100kΩ. One end of the twenty-ninth resistor R78 is connected to the inverting input terminal -INA, and the other end of one end of the twenty-ninth resistor R78 is connected to the first battery 11. The resistance of the twenty-ninth resistor R78 is 10kΩ. One end of the thirtieth resistor R67 is connected to the positive input terminal +INA, and the other end of the thirtieth resistor R67 is connected to the second battery 12. The resistance of the thirtieth resistor R67 is 10kΩ. One end of the thirty-first resistor R60 is connected to the positive input pin +INA, and the other end of the thirty-first resistor R60 is connected to the load 19. The resistance of the thirty-first resistor R60 is 100 kΩ.

[0075] Please refer to Figure 4 The feedback module 17 also includes a seventh diode D57, an eighth diode D56, a forty-second capacitor C1081, a thirty-second resistor R96, and a thirty-third resistor R832. The anode of the seventh diode D57 is connected to the amplifier output pin OUTB, and the cathode of the seventh diode D57 is connected to the load 19. The anode of the eighth diode D56 is connected to the load 19, and the cathode of the eighth diode D56 is connected to the amplifier output pin OUTB. One end of the forty-second capacitor C1081 is connected to the amplifier output pin OUTB, and the other end of the forty-second capacitor C1081 is connected to the load 19. The capacitive reactance of the forty-second capacitor C1081 is 0.22 μF. One end of the thirty-second resistor R96 is connected to the first adjustment resistor R847, and the other end of the thirty-second resistor R96 is connected to the amplifier output pin OUTB. The resistance of the thirty-second resistor R96 is 10 kΩ. One end of the thirty-third resistor R832 is connected to the amplifier output pin OUTB, and the other end of the thirty-third resistor R832 is grounded. The resistance of the thirty-third resistor R832 is 5.1 kΩ.

[0076] Please refer to Figure 4The feedback module 17 also includes a forty-third capacitor C47, a thirty-fourth resistor R88, a thirty-fifth resistor R77, a thirty-sixth resistor R66, and a thirty-seventh resistor R59. One end of the forty-third capacitor C47 is connected to the amplifier output pin OUTB, and the other end of the forty-third capacitor C47 is connected to the inverting input pin -INB. The forty-third capacitor C47 has a capacitive reactance of 470 pF and a withstand voltage of 50 V. One end of the thirty-fourth resistor R88 is connected to the amplifier output pin OUTB, and the other end of the thirty-fourth resistor R88 is connected to the inverting input pin -INB. The resistance of the thirty-fourth resistor R88 is 100 kΩ. One end of the thirty-fifth resistor R77 is connected to the inverting input terminal -INB, and the other end of one end of the thirty-fifth resistor R77 is connected to the first battery 11. The resistance of the thirty-fifth resistor R77 is 10 kΩ. One end of the thirty-sixth resistor R66 is connected to the positive input terminal +INB, and the other end of the thirty-sixth resistor R66 is connected to the second battery 12. The resistance of the thirty-sixth resistor R66 is 10 kΩ. One end of the thirty-seventh resistor R59 is connected to the amplifier output pin OUTB, and the other end of the thirty-seventh resistor R59 is connected to the load 19. The resistance of the thirty-seventh resistor R59 is 5.1 kΩ.

[0077] Please refer to Figure 4 The feedback module 17 further includes a 44th capacitor C1042, a 9th diode D58, and a 10th diode D59. One end of the 44th capacitor C1042 is connected to the first battery 11, and the other end of the 44th capacitor C1042 is connected to the second battery 12. The anode of the 9th diode D58 is connected to the second battery 12, and the cathode of the 9th diode D58 is connected to the first battery 11. The anode of the 10th diode D59 is connected to the first battery 11, and the cathode of the 10th diode D59 is connected to the second battery 12. Furthermore, the feedback module 17 further includes a 38th resistor R846, a 39th resistor R851, a 40th resistor R853, and a 41st resistor R852. One end of the 38th resistor R846 is connected to the 29th resistor R78, and the other end of the 38th resistor R846 is grounded. The resistance of the 38th resistor R846 is 1 kΩ. One end of the 39th resistor R851 is connected to the 29th resistor R78, and the other end of the 39th resistor R851 is connected to the first battery 11. The resistance of the 39th resistor R851 is 2 kΩ. One end of the 40th resistor R853 is connected to the 35th resistor R77, and the other end of the 40th resistor R853 is grounded. The resistance of the 40th resistor R853 is 1 kΩ. One end of the 41st resistor R852 is connected to the 35th resistor R77, and the other end of the 41st resistor R852 is grounded. The resistance of the 41st resistor R852 is 2 kΩ.

[0078] Please refer to Figure 2 、 Figure 3 and Figure 5The dual-battery power supply circuit 10 also includes a chip power supply module 18, which is connected to the first control chip U13 and the second control chip U12 respectively. The chip power supply module 18 is used to power the first control chip U13 and the second control chip U12, and the power supply chip module can output a voltage of 5V. The chip power supply module 18 includes a power supply chip U63, the model of the power supply chip U63 is RT7272B, and the power supply chip includes a VIN pin, an EN pin, a RLIM pin, and a GND pin, and the GND pin is grounded. The chip power supply module 18 includes an eleventh diode D68, a twelfth diode D67, a forty-fifth capacitor C1086, a forty-sixth capacitor C1083, a forty-seventh capacitor C1082, a forty-second resistor R934, and a forty-third resistor R936.

[0079] Please refer to Figure 5 The anode of the eleventh diode D68 is connected to the first battery 11, and the cathode of the eleventh diode D68 is connected to the VIN pin. The anode of the twelfth diode D67 is connected to the second battery 12, and the cathode of the twelfth diode D67 is connected to the VIN pin. One end of the forty-fifth capacitor C1086 is connected to the VIN pin, and the other end of the forty-fifth capacitor C1086 is grounded. The capacitive reactance of the forty-fifth capacitor C1086 is 1μF, and the withstand voltage of the forty-fifth capacitor C1086 is 35V. One end of the forty-sixth capacitor C1083 is connected to the VIN pin, and the other end of the forty-sixth capacitor C1083 is grounded. The capacitive reactance of the forty-sixth capacitor C1083 is 22μF, and the withstand voltage of the forty-sixth capacitor C1083 is 25V. One end of the forty-seventh capacitor C1082 is connected to the VIN pin, and the other end of the forty-seventh capacitor C1082 is grounded. The capacitive reactance of the forty-seventh capacitor C1082 is 0.1μF, and the withstand voltage of the forty-seventh capacitor C1082 is 50V. One end of a 42nd resistor R934 is connected to the VIN pin, and the other end of the 42nd resistor R934 is connected to the EN pin. The resistance of the 42nd resistor R934 is 10 kΩ. One end of a 43rd resistor R936 is connected to the RLIM pin, and the other end of the 43rd resistor R936 is grounded. The resistance of the 43rd resistor R936 is 137 kΩ.

[0080] Please refer to Figure 5The power supply chip U63 includes a BOOT pin, a SW pin, a FB pin, and a COMP pin. The BOOT pin is connected to the SW pin, and the SW pin is used to output a 5V voltage. The chip power supply module 18 includes a forty-fourth resistor D68, a forty-eighth capacitor C1085, and a fifth inductor L91, and the fifth inductor L91 is connected to the SW pin. One end of the forty-fourth resistor D68 is connected to the BOOT pin, and the other end of the forty-fourth resistor D68 is connected to the forty-eighth capacitor C1085. The resistance of the forty-fourth resistor D68 is 10Ω. The forty-eighth capacitor C1085 is connected to the SW pin, and the capacitive reactance of the forty-eighth capacitor C1085 is 0.1μF.

[0081] Please refer to Figure 5 The chip power supply module 18 also includes a forty-eighth capacitor C1084, a forty-ninth capacitor C1087, a fiftieth capacitor C1088, a forty-fifth resistor R937, a forty-sixth resistor R938, and a forty-seventh resistor R939. One end of the forty-eighth capacitor C1084 is connected to the COMP pin, and the other end of the forty-eighth capacitor C1084 is connected to one end of the forty-fifth resistor R937. The other end of the forty-fifth resistor R937 is grounded, and the resistance of the forty-fifth resistor R937 is 24kΩ. The capacitive reactance of the forty-eighth capacitor C1084 is 2.7nF, and the withstand voltage of the forty-eighth capacitor C1084 is 50V. One end of the forty-ninth capacitor C1087 is connected to the fifth inductor L91, and the other end of the forty-ninth capacitor C1087 is grounded. The capacitive reactance of the forty-ninth capacitor C1087 is 0.1μF, and the withstand voltage of the forty-ninth capacitor C1087 is 50V. One end of the 50th capacitor C1088 is connected to the fifth inductor L91, and the other end of the 50th capacitor C1088 is grounded. The capacitive reactance of the 50th capacitor C1088 is 47 μF, and the withstand voltage of the 50th capacitor C1088 is 16 V. One end of the 46th resistor R938 is connected to the fifth inductor L91, and one end of the 46th resistor R938 is connected to the FB pin. The resistance of the 46th resistor R938 is 60.4 kΩ. One end of the 47th resistor R939 is connected to the 46th resistor R938, and the other end of the 47th resistor R939 is grounded. The resistance of the 47th resistor R939 is 10 kΩ.

[0082] Please refer to Figure 4 and Figure 6The dual-battery power supply circuit 10 also includes an amplifier power supply module 181, which is used to power the first operational amplifier U9A. The first operational amplifier U9A includes an amplifier power supply terminal V+ and an amplifier ground terminal V-. The amplifier power supply terminal is connected to the amplifier power supply module 181, and the amplifier ground terminal is grounded. The amplifier power supply module 181 includes an amplifier power supply chip U64, and the model of the amplifier power supply chip U64 is DS8301A-12S5. The amplifier power supply chip U64 includes a VIN pin, an EN pin, a VOUT pin, a J pin, and a GND pin. The amplifier power supply module 181 also includes a thirteenth diode D70, a fourteenth diode D69, a forty-eighth resistor R940, and a fifty-first capacitor C1089. The anode of the thirteenth diode D70 is connected to the first battery 11, and the cathode of the thirteenth diode D70 is connected to the VIN pin. The anode of the fourteenth diode D69 is connected to the second battery 12, and the cathode of the fourteenth diode D69 is connected to one end of the forty-eighth resistor R940. The other end of one end of the forty-eighth resistor R940 is connected to the EN pin. The resistance of the forty-eighth resistor R940 is 10 kΩ. One end of the fifty-first capacitor C1089 is connected to the cathode of the fourteenth diode D69 and the cathode of the thirteenth diode D70. The other end of the fifty-first capacitor C1089 is grounded. The capacitive reactance of the fifty-first capacitor C1089 is 1 μF, and the withstand voltage of the fifty-first capacitor C1089 is 35 V.

[0083] Please refer to Figure 4 and Figure 6 The amplifier power supply module 181 also includes a forty-ninth resistor R941, a fiftieth resistor R942, a fifty-second capacitor C1090, and a fifty-third capacitor C1091. One end of the forty-ninth resistor R941 is connected to the VOUT pin, and the other end of the forty-ninth resistor R941 is connected to the J pin. The resistance of the forty-ninth resistor R941 is 10kΩ, and the VOUT pin of the amplifier power supply chip U64 is also connected to the amplifier power supply terminal V+. The VOUT pin of the amplifier power supply chip U64 can be used to output a voltage of 9.9V. One end of the fiftieth resistor R942 is connected to the forty-ninth resistor R941 and the J pin, and the other end of the fiftieth resistor R942 is grounded. One end of the fifty-second capacitor C1090 is connected to the VOUT pin, and the other end of the fifty-second capacitor C1090 is grounded. The capacitive reactance of the fifty-second capacitor C1090 is 0.1μF, and the withstand voltage of the fifty-second capacitor C1090 is 50V. One end of the fifty-third capacitor C1091 is connected to the VOUT pin, and the other end of the fifty-third capacitor C1091 is grounded. The capacitive reactance of the fifty-third capacitor C1091 is 10 μF, and the withstand voltage of the fifty-third capacitor C1091 is 25V.

[0084] Please refer to Figure 1The first feedback signal can adjust the output duty cycle of the first control signal, and the second feedback signal can adjust the output duty cycle of the second control signal. When the voltage difference between the first battery 11 and the second battery 12 is greater than 0, the output duty cycle of the first control signal is greater than the output duty cycle of the second control signal, causing the first driver module 13 to be on for a longer time than the second driver module 14. Therefore, the current value of the first drive current is greater than the current value of the second drive current. When the voltage difference between the first battery 11 and the second battery 12 is less than 0, the output duty cycle of the first control signal is less than the output duty cycle of the second control signal, causing the first driver module 13 to be on for a shorter time than the second driver module 14. Therefore, the current value of the first drive current is less than the current value of the second drive current. Therefore, during power supply, the battery with a higher charge will output a higher voltage and current than the battery with a lower charge. Therefore, during use, the remaining charge of the two batteries gradually approaches the same, and the battery with a higher voltage will output a higher voltage and current than the battery with a lower voltage. Therefore, when replacing batteries, the dual-battery power supply circuit 10 does not require replacing two batteries with the same charge or voltage. The technical problem of the inconvenience of users using products with conventional dual-battery power supply circuit 10 is effectively solved.

[0085] In a conventional dual-battery power supply circuit 10, if two batteries that do not meet the requirements are used simultaneously for power supply, it can easily damage the batteries and even pose a safety hazard. Furthermore, because the power supply duration depends on the battery with the lower charge, the battery life is also unsatisfactory. However, the dual-battery power supply circuit 10 does not require the two batteries to have the same charge or voltage to supply power. Furthermore, during power supply, the battery with the higher charge will output a higher current than the battery with the lower charge, gradually bringing the charge levels of the two batteries closer to the same level. Therefore, the dual-battery power supply circuit 10 not only eliminates safety hazards but also ensures the longest battery life when using a mixture of batteries with different charge levels.

[0086] The working principle of the present invention is as follows: when the dual-battery power supply circuit 10 is operating, the first battery 11 can output a first power supply current, and the second battery 12 can output a second power supply current. The first control module 15 can output a first control signal, which can drive the first MOS driver U19. Then, the first MOS transistor driver can drive the first MOS transistor chip Q15 to turn on. Then, the first MOS transistor chip Q15 can generate a first drive current based on the first power supply current. In addition, the second control module 16 can output a second control signal, which can drive the second MOS driver U8. Then, the second MOS transistor driver can drive the second MOS transistor chip Q10 to turn on. Then, the second MOS transistor chip Q10 can generate a second drive current based on the second power supply current.

[0087] At the same time, the feedback module 17 can generate a first feedback signal and a second feedback signal based on the voltage difference between the first battery 11 and the second battery 12. The feedback module 17 feeds the first feedback signal back to the first control module 15. The first feedback signal can adjust the output duty cycle of the first control signal. Since the first control signal can control the on / off state of the first MOS transistor chip Q15, the first control module 15 can control the on / off timing of the first MOS transistor chip Q15. Based on the on / off timing of the first driver module 13, the first control module 15 can further adjust the current value of the first drive current. The feedback module 17 feeds the second feedback signal back to the second control module 16. The second feedback signal can adjust the output duty cycle of the second control signal. Since the second control signal can control the on / off state of the second MOS transistor chip Q10, the second control module 16 can control the on / off timing of the second MOS transistor chip Q10. Based on the on / off timing of the second driver module 14, the second control module 16 can further adjust the current value of the second drive current.

[0088] When the voltage difference between the first battery 11 and the second battery 12 is greater than zero, the output duty cycle of the first control signal is adjusted by the first feedback signal and the second feedback signal to be greater than the output duty cycle of the second control signal. Consequently, the on-time of the first MOS transistor chip Q15 is greater than the on-time of the second MOS transistor chip Q10, and the current value of the first drive current is greater than the current value of the second drive current. When the voltage difference between the first battery 11 and the second battery 12 is less than zero, the output duty cycle of the first control signal is adjusted by the first feedback signal and the second feedback signal to be less than the output duty cycle of the second control signal. Consequently, the on-time of the first MOS transistor chip Q15 is less than the on-time of the second MOS transistor chip Q10, and the current value of the first drive current is less than the current value of the second drive current. The first and second drive currents can provide electrical energy to the load 19. During the power supply process, the remaining charge of the two batteries gradually approaches the same, and the dual-battery power supply circuit 10 can be powered by two batteries with different charge levels or voltages.

[0089] The utility model provides a dual-battery power supply circuit, which includes a first battery, a second battery, a first drive module, a second drive module, a first control module, a second control module, and a feedback module. Based on the voltage difference between the first battery and the second battery, the feedback module can generate a first feedback signal and a second feedback signal. The first feedback signal can adjust the output duty cycle of the first control signal, and the first control signal can control the on and off time of the first drive module. Therefore, the first control module can control the on and off time of the first drive module. Based on the on and off time of the first drive module, the first control module can further adjust the current value of the first drive current. Moreover, the second feedback signal can adjust the output duty cycle of the second control signal, and the second control signal can control the on and off time of the second drive module. Therefore, the second control module can control the on and off time of the second drive module. Based on the on and off time of the second drive module, the second control module can further adjust the current value of the second drive current.

[0090] When the voltage difference between the first battery and the second battery is greater than 0, the current value of the first drive current is greater than the current value of the second drive current. When the voltage difference between the first battery and the second battery is less than 0, the current value of the first drive current is less than the current value of the second drive current. Therefore, the battery with a higher charge will output a higher current than the battery with a lower charge. During use, the remaining charge of the two batteries gradually approaches the same, and the dual-battery power supply circuit can use two batteries with different charge levels for power supply. Moreover, in this dual-battery power supply circuit, the battery with a higher voltage will also output a higher current than the battery with a lower voltage. Therefore, when replacing batteries, the dual-battery power supply circuit does not require replacing two batteries with the same charge level or voltage. This effectively solves the technical problem of users being inconvenienced when using products with conventional dual-battery power supply circuits.

[0091] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims.

Claims

1. A dual battery power supply circuit, characterized in that: It includes: a first battery, configured to output a first supply current; a second battery, configured to output a second supply current; a first driving module, configured to generate a first driving current based on the first supply current; A second driving module, configured to generate a second driving current based on the second supply current; wherein the first driving current and the second driving current are used to provide electrical energy to a load; A first control module, configured to output a first control signal, wherein the first control signal is used to control the first driving module to be turned on and off; A second control module, configured to output a second control signal, wherein the second control signal is used to control the second driving module to be turned on and off; a feedback module, configured to generate a first feedback signal and a second feedback signal based on a voltage difference between the first battery and the second battery, wherein the feedback module feeds back the first feedback signal to the first control module, and the first feedback signal is used to adjust the output duty cycle of the first control signal; and the feedback module feeds back the second feedback signal to the second control module, and the second feedback signal is used to adjust the output duty cycle of the second control signal; When the voltage difference between the first battery and the second battery is greater than 0, the current value of the first driving current is greater than the current value of the second driving current; when the voltage difference between the first battery and the second battery is less than 0, the current value of the first driving current is less than the current value of the second driving current.

2. The dual battery power supply circuit according to claim 1, characterized in that: The first control module includes a first control chip, the first drive module includes a first MOS driver, a second MOS driver, a first MOS transistor chip, and a second MOS transistor chip, the first control chip includes a first output pin, the first MOS driver includes a first MOS driver input pin and a first MOS driver output pin, and the first MOS transistor chip includes a first MOS transistor chip input pin, a first MOS transistor chip output pin, and a first MOS transistor chip control pin; The first output pin is connected to the first MOS driver input pin, the first MOS driver output pin is connected to the first MOS transistor chip control pin, the first MOS transistor chip input pin is connected to the first battery, and the first MOS transistor chip output pin is connected to the load; The first control chip further includes a second output pin, the second MOS driver includes a second MOS driver input pin and a second MOS driver output pin, and the second MOS transistor chip includes a second MOS transistor chip input pin, a second MOS transistor chip output pin, and a second MOS transistor chip control pin; The second output pin is connected to the second MOS driver input pin, the second MOS driver output pin is connected to the second MOS tube chip control pin, the second MOS tube chip input pin is connected to the first battery, and the second MOS tube chip output pin is connected to the load.

3. The dual battery power supply circuit according to claim 2, characterized in that: The second control module includes a second control chip, the second drive module includes a third MOS driver, a fourth MOS driver, a third MOS transistor chip, and a fourth MOS transistor chip, the second control chip includes a third output pin, the second MOS driver includes a third MOS driver input pin and a third MOS driver output pin, and the third MOS transistor chip includes a third MOS transistor chip input pin, a third MOS transistor chip output pin, and a third MOS transistor chip control pin; The third output pin is connected to the third MOS driver input pin, the third MOS driver output pin is connected to the third MOS tube chip control pin, the third MOS tube chip input pin is connected to the second battery, and the third MOS tube chip output pin is connected to the load; The second control chip further includes a fourth output pin, the fourth MOS driver includes a fourth MOS driver input pin and a fourth MOS driver output pin, and the fourth MOS transistor chip includes a fourth MOS transistor chip input pin, a fourth MOS transistor chip output pin, and a fourth MOS transistor chip control pin; The fourth MOS tube chip input pin is connected to the second battery, the fourth output pin is connected to the fourth MOS driver input pin, the fourth MOS driver output pin is connected to the fourth MOS tube chip control pin, and the fourth MOS tube chip output pin is connected to the load.

4. The dual battery power supply circuit according to claim 2, characterized in that: The feedback module includes a first operational amplifier and a first adjustment unit. The first operational amplifier includes a forward input pin, a reverse input pin, and an amplifier output pin. The forward input pin is connected to the second battery, and the reverse input pin is connected to the first battery. One end of the first adjustment unit is connected to the first control chip, and the other end of the first adjustment unit is connected to the amplifier output pin.

5. The dual battery power supply circuit according to claim 3, characterized in that: The feedback module includes a second operational amplifier and a second adjustment unit. The second operational amplifier includes a positive input pin, a reverse input pin, and an amplifier output pin. The positive input pin is connected to the first battery, and the reverse input pin of the first operational amplifier is connected to the second battery. One end of the second adjustment unit is connected to the second control chip, and the other end of the second adjustment unit is connected to the operational amplifier output pin.

6. The dual battery power supply circuit according to claim 4, characterized in that: The first adjustment unit includes a first adjustment resistor and a second adjustment resistor, the first control chip includes a first detection pin and a second detection pin, one end of the first adjustment resistor is connected to the first detection pin, and the other end of the first adjustment resistor is connected to the amplifier output pin, one end of the second adjustment resistor is connected to the second detection pin, and the other end of the second adjustment resistor is connected to the amplifier output pin.

7. The dual battery power supply circuit according to claim 5, characterized in that: The second adjustment unit includes a third adjustment resistor and a fourth adjustment resistor, the second control chip includes a third detection pin and a fourth detection pin, one end of the third adjustment resistor is connected to the third detection pin, and the other end of the third adjustment resistor is connected to the amplifier output pin, one end of the fourth adjustment resistor is connected to the fourth detection pin, and the other end of the fourth adjustment resistor is connected to the amplifier output pin.

8. The dual battery power supply circuit according to claim 3, characterized in that: The model of the first control chip is LTC3861EUHE, and the model of the second control chip is LTC3861EUHE.

9. The dual battery power supply circuit according to claim 3, characterized in that: The dual-battery power supply circuit further includes a chip power supply module, which is connected to the first control chip and the second control chip respectively, and is used to supply power to the first control chip and the second control chip.

10. A circuit board, characterized in that: It includes the dual-battery power supply circuit according to any one of claims 1-9.

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