Double-path power supply circuit and charger

Abstract

The utility model discloses a double-circuit power supply circuit and a charger, the double-circuit power supply circuit comprises a first power supply module and a second power supply module, and the first power supply module and the second power supply module are connected in parallel; wherein the first power supply module is connected with a power supply and is used for converting a power supply signal into a first power supply signal and supplying power to a load through the first power supply signal; the second power supply module is used for storing electric energy and outputting a second power supply signal through the electric energy to supply power to the load; therefore, the circuit architecture of the charger is optimized, the material cost of the product is saved, and the charging efficiency is improved.

Description

Technical Field

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

[0002] A power bank (also known as a power bank) is a portable charger that combines power and charging functions, primarily used to charge electronic devices. When traveling or on business, people often carry a charger or power bank to keep their phones and other electronic devices charged. These two charging devices can take up a lot of space.

[0003] In order to solve this problem, a mobile power supply has appeared on the market that can combine a charger and a power bank into one, which is convenient for carrying and using. However, the technology used in the current charging products that combine a charger and a power bank into one is that the charger alone supplies power to the load, resulting in a relatively large overall size of the product and a relatively high cost. Utility Model Content

[0004] In view of this, an embodiment of the present application provides a dual-power supply circuit, which aims to optimize the circuit architecture of a two-in-one charger and mobile power supply product, save product material costs and improve charging efficiency.

[0005] The technical solution of the embodiment of the present application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a dual-power supply circuit, the dual-power supply circuit comprising a first power supply module and a second power supply module, the first power supply module and the second power supply module being connected in parallel; wherein,

[0007] The first power supply module is connected to the power supply, and is used to convert the power supply signal into a first power supply signal, and supply power to the load through the first power supply signal;

[0008] The second power supply module is used to store electric energy and output a second power supply signal through the electric energy to power the load.

[0009] In a second aspect, an embodiment of the present application provides a charger that implements the dual power supply circuit described above.

[0010] The dual-power supply circuit provided in the embodiment of the present application includes a first power supply module and a second power supply module, which are connected in parallel; wherein the first power supply module is used to connect to a power source to convert a power supply signal into a first power supply signal, and power the load through the first power supply signal; the second power supply module stores electrical energy and outputs a second power supply signal through the electrical energy to power the load. In this way, the charger can simultaneously power the load through the first power supply module and the second power supply module, solving the problem in the prior art that the charger alone powers the load in two-in-one charging products, resulting in a larger overall product size and higher cost. This reduces the product size while improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the structure of the dual-power supply circuit according to an embodiment of the present application;

[0012] Figure 2 This is a structural diagram of the first power supply module of the dual power supply circuit according to an embodiment of the present application;

[0013] Figure 3 This is a circuit diagram of a first power supply module of a dual power supply circuit according to an embodiment of the present application;

[0014] Figure 4 This is a circuit diagram of a charging management circuit of a dual power supply circuit according to an embodiment of the present application;

[0015] Figure 5 This is a circuit diagram of a first voltage adjustment circuit of a dual power supply circuit according to an embodiment of the present application;

[0016] Figure 6a This is a structural diagram of the second voltage adjustment circuit of the dual power supply circuit according to an embodiment of the present application;

[0017] Figure 6b This is a circuit diagram of the first buck-boost circuit of the dual power supply circuit of the embodiment of the present application. Figure 1 ;

[0018] Figure 6c This is a circuit diagram of the second buck-boost circuit of the dual power supply circuit of the embodiment of the present application. Figure 2 ;

[0019] Figure 7 This is a circuit diagram of a display module with a dual power supply circuit according to an embodiment of the present application;

[0020] Figure 8 This is a circuit diagram of a key module of a dual-power supply circuit according to an embodiment of the present application;

[0021] Figure 9 This is a circuit diagram of a controller for a dual-power supply circuit according to an embodiment of the present application;

[0022] Figure 10 The circuit diagram of the temperature detection circuit of the dual power supply circuit in the embodiment of the present application is as follows Figure 1 ;

[0023] Figure 11 The circuit diagram of the temperature detection circuit of the dual power supply circuit in the embodiment of the present application is as follows Figure 2 . DETAILED DESCRIPTION

[0024] The present application will be described in further detail below with reference to the accompanying drawings and embodiments.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0026] It should be noted that the terms "first," "second," etc., herein are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0027] Figure 1 A schematic diagram of a dual-circuit power supply circuit is provided in an embodiment of the present application. Figure 1 As shown, the dual-way power supply circuit includes a first power supply module 11 and a second power supply module 12, and the first power supply module 11 and the second power supply module 12 are connected in parallel. Among them, the first power supply module 11 is connected to the power supply 13, and is used to convert the power supply signal into a first power supply signal, and supply power to the load 14 through the first power supply signal. The second power supply module 12 is used to store electrical energy and output a second power supply signal to supply power to the load 14 through electrical energy. In this way, the present application realizes that the load 14 is supplied with power at the same time by connecting the first power supply module 11 and the second power supply module 12 of the dual-way power supply circuit in parallel.

[0028] For example, Figure 2 This is a schematic diagram of the structure of the first power supply module of a dual power supply circuit provided in an embodiment of the present application. Figure 2As shown, the first power supply module 11 includes an AC / DC conversion circuit 21 and a first voltage adjustment circuit 22. The AC / DC conversion circuit 21 is connected to the power supply 13 and is configured to convert an AC power signal into a DC power signal. The DC power signal has a first voltage. The first voltage adjustment circuit 22 is connected to the AC / DC conversion circuit 21 and is configured to adjust the voltage of the DC power signal to a second voltage, thereby forming a first power signal. The first power signal has a first power, which is less than or equal to a first power threshold.

[0029] Here, as Figure 3 As shown, Figure 3 A circuit diagram of the first power supply module of a dual-power supply circuit provided in an embodiment of the present application. The AC / DC conversion circuit may include an AC / DC circuit, a transformer circuit, and a PWM control circuit. The input end of the transformer circuit is connected to the AC / DC circuit, and the output end of the transformer circuit is connected to the PWM control circuit and the first voltage adjustment circuit, respectively. In this way, the AC input can be internally converted to a DC output. The first power supply module can output a fixed first voltage of 9V, with a maximum power limit of 30W at the first power threshold. The first power supply module is connected to both ends of the second power supply module through the first voltage adjustment circuit. Ultimately, the first power supply module and the second power supply module provide energy to the load through the second voltage adjustment circuit. Specifically, when the power load demand is the second power threshold and is greater than the first power threshold of 30W, the charger preferentially provides 30W of power to the load through the first power supply module, and the remaining part is provided by the discharge of the battery of the second power supply module.

[0030] Exemplarily, the dual power supply circuit further includes a charging management circuit 15. The charging management circuit 15 is connected to a first voltage adjustment circuit 22 and configured to send a first pulse-width modulation (PWM) signal to the first voltage adjustment circuit 22. The first voltage adjustment circuit 22 is configured to adjust the voltage of the DC power signal to a second voltage based on the first PWM signal.

[0031] Here, refer to Figure 4 , Figure 4 This is a circuit diagram of a charging management circuit for a dual power supply circuit provided in an embodiment of the present application. Figure 4As shown, the charging management circuit 15 includes a charging chip, model SW7201. The charging management circuit 15 also includes a switching transistor provided on the first voltage adjustment circuit 22. The charging chip is connected to the switching transistor. The charging chip controls the on / off state of the switching transistor to control the first pulse-width modulation (PWM) signal sent to the first voltage adjustment circuit 22. The first voltage adjustment circuit 22 adjusts the voltage of the DC power supply signal to a second voltage based on the first PWM signal. Preferably, the switching transistor is a field-effect transistor (MOS transistor). Specifically, the switching transistor provided on the first voltage adjustment circuit 22 mainly includes two MOS transistors Q1 and Q2, which are connected to resistors R1 and R2, respectively. The charging chip is connected to the gate of the MOS transistor Q1 via a pin, and the charging chip is connected to the gate of the MOS transistor Q2 via a pin. The charging chip adjusts the duty cycle of the drive signals of the MOS transistors Q1 and Q2 to send the first pulse-width modulation (PWM) signal to the first voltage adjustment circuit 22, thereby enabling the charging chip to control the power of the first power supply module.

[0032] Exemplarily, the charging management circuit 15 is further connected to the second power supply module 12, and is configured to send a second PWM signal to the second power supply module 12. The second power supply module 12 is configured to output a second power supply signal based on the second PWM signal.

[0033] Preferably, the charging management circuit 15 further includes a filter circuit composed of capacitors C12-C18 and EC1. The first voltage adjustment circuit 22 further includes a protection resistor R8. The first voltage adjustment circuit 22 is connected to the second power supply module 12 through the filter circuit.

[0034] Exemplarily, the first voltage adjustment circuit 22 is a step-down circuit.

[0035] Specifically, Figure 5 A circuit diagram of a first voltage adjustment circuit of a dual power supply circuit provided in an embodiment of the present application is shown in FIG. Figure 5As shown, the first voltage regulation circuit 22 is a step-down circuit, primarily comprising three MOS transistors Q1, Q2, and Q6, resistors R1-R7, capacitors C9-C11, C21-C23, and an inductor L1. The inductor functions as an energy storage and filtering circuit. A charging chip is connected to the gate of MOS transistor Q1 via pin HD1, and to the gate of MOS transistor Q2 via pin LD1. Capacitors C9-C11, C21, C22, and EC2 form a filtering circuit. The first voltage regulation circuit 22 also includes a protective resistor R5. Through the filtering circuit, the first voltage regulation circuit 22 is connected to the first power supply module 12. MOS transistor Q1 is connected to resistor R1, and MOS transistor Q2 is connected to resistor R2. Resistors R1 and R2 are used to reduce the turn-on losses of the MOS transistors. The gate of MOS transistor Q6 is connected to the output terminal of the first power supply circuit. The first voltage regulation circuit 22 is grounded via capacitors C21, C23, C26, and C27.

[0036] Exemplarily, the second power supply module 12 includes a plurality of battery packs connected in series, wherein the battery pack is used to store electrical energy and output a second power supply signal to power the load through the electrical energy.

[0037] Here, the battery pack is used to store electrical energy, and users can use the stored energy in the battery pack to charge electrical loads. The electrical load is an electronic device that matches the power supply capacity and port type of the charger in the embodiment of this application, such as a mobile phone, tablet computer, drone, and other electronic devices. This application does not specifically limit the specific form of the electrical load.

[0038] Exemplarily, the dual power supply circuit further includes a second voltage adjustment circuit 16. The second voltage adjustment circuit 16 is connected to the parallel connection of the first power supply module 11 and the second power supply module 12, and is configured to combine the first power supply signal and the second power supply signal into a third power supply signal, and adjust the voltage of the third power supply signal to a third voltage to form a fourth power supply signal, which is used to power the load. The fourth power supply signal has a second power, which is less than or equal to a second power threshold.

[0039] For example, when the battery charge of the second power supply module is greater than 20%, the first power supply module and the second power supply module are connected in parallel to provide power. The first power supply module outputs a fixed first voltage of 9V, with a maximum power limit of 30W. The first power supply module is connected to both ends of the second power supply module through a first voltage adjustment circuit, and the maximum discharge power of the battery in the second power supply module is 30W. Ultimately, the first power supply module and the second power supply module provide energy to the load through the second voltage adjustment circuit. Specifically, when the power load demand is the second power threshold and is greater than the first power threshold of 30W, the charger preferentially provides 30W of power to the load through the first power supply module, and the remaining power is provided by the discharge of the battery in the second power supply module.

[0040] Exemplarily, the dual-power supply circuit further includes a charging drive circuit 17. The charging drive circuit 17 is connected to the second voltage adjustment circuit 16. The charging drive circuit includes a controller 171, model IP5385_AP23_S1GXACC. The dual-power supply circuit controls the charger based on the controller 171.

[0041] Exemplarily, the second voltage adjustment circuit 16 is a buck-boost circuit.

[0042] Here, refer to Figure 6a 6 is a schematic diagram of the structure of a second voltage adjustment circuit of a dual power supply circuit provided by an embodiment of the present application. Figure 6a As shown, the second voltage adjustment circuit of the embodiment of the present application is a two-stage buck-boost circuit, that is, it includes a first buck-boost circuit 61 and a second buck-boost circuit 62. The two-stage buck-boost circuit can realize the buck function and the boost function.

[0043] Specifically, refer to Figure 6b , Figure 6b A circuit diagram of a first buck-boost circuit 61 of a dual-path power supply circuit provided in an embodiment of the present application is shown in FIG. Figure 6b As shown, it mainly includes four MOS transistors Q7-Q10 and an inductor L3, wherein the inductor L1 plays the role of energy storage and filtering. The controller 171 is connected to the gate of the MOS transistor Q8 via the pin HG1, the controller 171 is connected to the gate of the MOS transistor Q9 via the pin HG2, the controller 171 pin LG1 is connected to the gate of the MOS transistor Q7, and the controller 171 is connected to the gate of the MOS transistor Q10 via the pin LG2. The controller 171 adjusts the duty cycle of the drive signal of the MOS transistors Q7-Q10 to control the first buck-boost circuit.

[0044] Here, MOS transistor Q8 is connected to resistor R50 and diode D10, MOS transistor Q7 is connected to resistor R51, MOS transistor Q9 is connected to resistor R53 and diode D11, and MOS transistor Q10 is connected to resistor R52. Resistors R50-R53 are used to reduce turn-on losses of the MOS transistors, and diodes are used to increase the turn-off speed of the MOS transistors.

[0045] Here, the resistor R58 is connected in series with the capacitor C32 to form a damping absorption circuit for suppressing the peak voltage of the MOS transistor Q7; the resistor R59 is connected in series with the capacitor C34 to form a damping absorption circuit for suppressing the peak voltage of the MOS transistor Q10.

[0046] Here, the drain of the MOS transistor Q9 is connected to the second power supply module 12 , and the drain of the MOS transistor Q8 is connected to the second buck-boost circuit 52 .

[0047] Specifically, refer to Figure 6c , Figure 6c This is a circuit diagram of a second buck-boost circuit 62 of a dual-path power supply circuit provided in an embodiment of the present application, as shown in FIG. Figure 6c As shown, the second buck-boost circuit 62 mainly includes four MOS transistors Q3-Q6. The controller 171 is connected to the gate of the MOS transistor Q3 via the pin VING, the controller 171 is connected to the gate of the MOS transistor Q4 via the pin VOUT2, the controller 171 is connected to the gate of the MOS transistor Q5 via the pin VBUS, and the controller 171 is connected to the gate of the MOS transistor Q6 via the pin VBUSG. The controller 171 adjusts the duty cycle of the drive signal of the MOS transistors Q3-Q6 to control the second buck-boost circuit.

[0048] Here, MOS transistor Q3 is connected to resistors R15 and R16 and diode D3, MOS transistor Q4 is connected to resistor R13, MOS transistor Q5 is connected to resistor R14 and diode D4, and MOS transistor Q6 is connected to resistor R14. Resistors R13-R16 are used to reduce turn-on losses of the MOS transistors, and diodes are used to increase the turn-off speed of the MOS transistors.

[0049] Here, the drain of the MOS transistor Q3 is connected to the port, and the drain of the MOS transistor Q4 is connected to the first buck-boost circuit.

[0050] Exemplarily, the dual power supply circuit further includes a display module 18 and a button module 19. The display module 18 is used to display the remaining power of the second power supply module 12. The button module 19 controls the working state of the charger.

[0051] Preferably, the display module 18 includes an LED light group, and the LED light group displays the remaining power of the second power supply module 12 based on the on and off status of each LED light.

[0052] It is understandable that the display module 18 and the key module 19 are arranged outside the charger.

[0053] Here, the display module 18 includes an LED light group, and each LED light can be arranged sequentially in the same direction, and the remaining power of the second power supply module 12 is displayed based on the number of LED lights that are continuously lit; each LED light can also be arranged in an array to form two-digit information, and the remaining power of the second power supply module 12 is displayed based on the digital information composed of the lit LED lights.

[0054] Here, the button module 19 may be a sleep button. The button module 19 is connected to the controller 171. When the user presses the button module 19, the controller 171 stops and the charger stops charging or discharging.

[0055] Preferably, when the user presses the button module 19 so that the multi-port mobile power supply stops charging or discharging, the user can press the button module 19 again to restore the charger to its previous working state.

[0056] Exemplarily, the port includes: a Type-A port and / or a Type-C port.

[0057] Regarding the aforementioned dual power supply circuit in the embodiment of the present application, the embodiment of the present application also provides a circuit schematic diagram of the dual power supply circuit for supplementary explanation.

[0058] Figure 7 This is a circuit diagram of a display module 18 with a dual power supply circuit provided in an embodiment of the present application.

[0059] Here, LEDs 1 to 5 of the display module 18 are connected to the controller 171 via pull-up resistors R39 to R43. LEDs 1 to 5 are arranged sequentially in the same direction and are used to display the remaining power of the second power supply module 12. For example, when the battery second power supply module 12 is fully charged, LEDs 1 to 5 are all lit; when the battery second power supply module 12 has 50% remaining power, LEDs 1 to 3 are lit, and LEDs 4 to 5 are off; when the stored power of the second power supply module 12 is depleted, LEDs 1 to 5 are all off.

[0060] Figure 8 This is a circuit diagram of a key module 19 with a dual power supply circuit provided in an embodiment of the present application.

[0061] Here, the key module 19 includes a key switch K1, a resistor R38 and a diode D7. The key switch K1 is connected to the controller 171 via the pin KEY. When the user presses the key switch K1, the controller 171 stops and the charger stops charging or discharging.

[0062] Figure 9 A circuit diagram of a dual power supply circuit provided in an embodiment of the present application.

[0063] Here, refer to Figure 9 , which shows a circuit diagram of the connection between the control drive circuit and the second voltage adjustment circuit in an embodiment of the present application. The controller 171 is a microprocessor (MCU), model IP5385_AP23_S1GXACC. The MCU is connected to the second power supply module 12 via pin BAT to obtain power and detect the remaining battery charge.

[0064] In another application example of this solution, the surface of the mobile power supply PCB is further attached with a thermistor RNTC1, and the AC / DC conversion circuit is further attached with a thermistor RNTC3. The MCU detects the outer shell temperature of the battery pack based on the thermistors RNTC1 and RNTC3. The detection circuit is as follows: Figure 10 shown. Specifically, Figure 10 This is a circuit diagram of a charger temperature detection circuit for a dual-power supply circuit in an embodiment of the present application. The temperature detection circuit includes a resistor R3, a capacitor C13, and thermistors RNTC1 and RNTC3. Changes in the power bank's PCB housing temperature and the AC / DC converter circuit's temperature will cause changes in the resistance of thermistors RNTC1 and RNTC3. The MCU determines the power bank's PCB and AC / DC converter circuit housing temperatures based on current changes on pins INTC1 and ACDC_UVCC. When the housing temperature reaches the temperature protection threshold, the MCU controls the switch to turn off, and the charger stops charging or discharging.

[0065] In another application example of this solution, a thermistor RNTC2 is attached to the surface of the battery pack. The MCU detects the outer shell temperature of the battery pack based on the thermistor RNTC2. The detection circuit is as follows: Figure 11 shown. Specifically, Figure 11 This is a circuit diagram of the battery temperature detection circuit for the dual-power supply circuit in an embodiment of the present application. The temperature detection circuit includes capacitor C14 and thermistor NTC2. Changes in the battery pack's outer casing temperature cause changes in the resistance of thermistor NTC2. The MCU determines the battery pack's outer casing temperature based on changes in the current at pin INTC2. When the battery pack's outer casing temperature reaches the temperature protection threshold, the MCU controls the switch to turn off, and the charger stops charging or discharging.

[0066] In addition, the technical solutions described in the embodiments of the present application can be combined arbitrarily without conflict.

[0067] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A dual-circuit power supply circuit, characterized in that: The dual power supply circuit includes a first power supply module and a second power supply module, wherein the first power supply module and the second power supply module are connected in parallel; wherein, The first power supply module is connected to the power supply, and is used to convert the power supply signal into a first power supply signal, and supply power to the load through the first power supply signal; The second power supply module is used to store electric energy and output a second power supply signal through the electric energy to power the load.

2. The dual power supply circuit according to claim 1, characterized in that: The first power supply module includes an AC / DC conversion circuit and a first voltage adjustment circuit; wherein, The AC / DC conversion circuit is connected to a power supply and is used to convert an AC power signal into a DC power signal; wherein the DC power signal has a first voltage; The first voltage adjustment circuit is connected to the AC-DC conversion circuit and is used to adjust the voltage of the DC power supply signal to a second voltage to form the first power supply signal; wherein, the first power supply signal has a first power, and the first power is less than or equal to a first power threshold.

3. The dual power supply circuit according to claim 2, characterized in that: The dual-circuit power supply circuit also includes a charging management circuit; wherein, The charging management circuit is connected to the first voltage adjustment circuit and is configured to send a first PWM signal to the first voltage adjustment circuit; The first voltage adjustment circuit is configured to adjust the voltage of the DC power signal to a second voltage based on the first PWM signal.

4. The dual power supply circuit according to claim 3, characterized in that: The charging management circuit is further connected to the second power supply module, and is configured to send a second PWM signal to the second power supply module; The second power supply module is configured to output the second power supply signal based on the second PWM signal.

5. The dual power supply circuit according to any one of claims 2 to 4, characterized in that: The first voltage adjustment circuit is a step-down circuit.

6. The dual power supply circuit according to any one of claims 1 to 4, characterized in that: The second power supply module includes a plurality of battery packs connected in series; wherein, The battery pack is used to store electric energy and output a second power supply signal to power the load through the electric energy.

7. The dual power supply circuit according to any one of claims 1 to 4, characterized in that: The dual power supply circuit also includes a second voltage adjustment circuit; wherein, The second voltage adjustment circuit is connected to the parallel end of the first power supply module and the second power supply module, and is used to combine the first power supply signal and the second power supply signal into a third power supply signal, and adjust the voltage of the third power supply signal to a third voltage to form a fourth power supply signal, and power the load through the fourth power supply signal; wherein the fourth power supply signal has a second power, and the second power is less than or equal to a second power threshold.

8. The dual power supply circuit according to claim 7, characterized in that: The second voltage adjustment circuit is a buck-boost circuit.

9. A charger, characterized in that: The charger comprises the dual-path power supply circuit according to any one of claims 1 to 8.

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