Voltage conversion circuit and mobile power supply

Abstract

The utility model discloses a voltage conversion circuit and a mobile power supply, and the voltage conversion circuit comprises a first DCDC converter of which the first end is connected with a battery and the second end is connected with a first charging interface; the first end of the second DCDC converter is connected with the battery, and the second end of the second DCDC converter is connected with the second charging interface; the first charging interface and the second charging interface are used for connecting an external power supply or external equipment; the switch assembly is connected in parallel between the first DCDC converter and the second DCDC converter; the microprocessor is connected with the switch assembly, and at least one of the first DCDC converter and the second DCDC converter is in a working state by controlling on-off of the switch assembly. According to the parallel connection structure of the first DCDC converter and the second DCDC converter, the better soaking effect is achieved, and the requirement for small-size heat dissipation is met.

Description

Technical Field

[0001] The present application relates to the technical field of mobile power supplies, and in particular to a voltage conversion circuit and a mobile power supply. Background Art

[0002] With the continuous advancement of science and technology, various electronic products are constantly updated and upgraded, and electronic products have become an indispensable part of people's social life. For example, computers, mobile phones, headphones, and other electronic products provide people with educational and entertainment functions. As electronic products become more and more closely integrated into people's lives, the battery life of electronic products has become a focus of attention. In particular, portable electronic devices are smaller in size and have smaller batteries than non-portable electronic devices such as desktop computers or televisions. Therefore, mobile power supplies are usually used to charge electronic devices.

[0003] At present, the mainstream development trend of mobile power is "large power and miniaturization". As the power increases, the current stress on the DCDC converter responsible for voltage conversion is also increasing, the loss on the conversion line is also increasing, and the heat rises sharply, resulting in the size of the mobile power cannot be reduced. At the same time, the high loss leads to a higher operating temperature, which threatens the safety of the battery cell and causes the outer casing temperature to rise, affecting the user experience. Utility Model Content

[0004] The present application provides a voltage conversion circuit and a mobile power supply, which can solve the problem of high heat loss caused by high-power charging of existing mobile power supplies.

[0005] In a first aspect, the present application provides a voltage conversion circuit, the voltage conversion circuit comprising:

[0006] A first DCDC converter, wherein a first end of the first DCDC converter is connected to a battery, and a second end of the first DCDC converter is connected to a first charging interface;

[0007] A second DCDC converter is connected in parallel with the first DCDC converter, a first end of the second DCDC converter is connected to a battery, and a second end of the second DCDC converter is connected to a second charging interface, wherein the first charging interface and the second charging interface are used to connect to an external power source or an external device;

[0008] A switch component is connected in parallel between the first DCDC converter and the second DCDC converter;

[0009] The microprocessor is connected to the switch component, and the microprocessor is used to control the on-off of the switch component so that at least one of the first DCDC converter and / or the second DCDC converter is in a working state.

[0010] Furthermore, the switch assembly includes a first switch tube, a second switch tube and a third switch tube.

[0011] The control end of the first switch tube is connected to the microprocessor to receive a first control signal output by the microprocessor; the first end of the first switch tube is connected to the second end of the first DCDC converter, and the second end of the first switch tube is connected to the first charging interface;

[0012] The control end of the second switch tube is connected to the microprocessor to receive a second control signal output by the microprocessor; the first end of the second switch tube is connected to the second end of the second DCDC converter, and the second end of the second switch tube is connected to the second charging interface;

[0013] The control end of the third switch tube is connected to the microprocessor to receive the third control signal output by the microprocessor; the first end of the third switch tube is connected to the first end of the first switch tube, and the second end of the third switch tube is connected to the first end of the second switch tube.

[0014] Furthermore, the voltage conversion circuit further includes a voltage and current sampling device, which is connected in series between the first DCDC converter and the first charging interface to detect a first output current of the first charging interface, and the voltage and current sampling device is connected in series between the second DCDC converter and the second charging interface to detect a second output current of the second charging interface;

[0015] The microprocessor receives the first output current and the second output current output by the voltage and current sampling device, and adjusts the output voltage of the first DCDC converter and / or the second DCDC converter based on the first output current, the second output current and the working state of the third switch tube.

[0016] Furthermore, the voltage and current sampling device includes a first voltage and current sampling device and a second voltage and current sampling device, wherein two ends of the first voltage and current sampling device are respectively connected to the second end of the first DCDC converter and the first end of the first switch tube, and two ends of the second voltage and current sampling device are respectively connected to the second end of the second DCDC converter and the first end of the second switch tube.

[0017] Furthermore, the switch component further includes a fourth switch tube, a control end of the fourth switch tube is connected to the microprocessor to receive a fourth control signal output by the microprocessor; a first end of the fourth switch tube is connected to the first end of the first DCDC converter, and a second end of the fourth switch tube is connected to the first end of the second DCDC converter.

[0018] Furthermore, the voltage conversion circuit further includes a third voltage and current sampling device, a first end of the third voltage and current sampling device is connected to the battery, and a second end of the third voltage and current sampling device is connected to the first end of the first DCDC converter and the first end of the fourth switch tube, for detecting the input current of the battery; wherein the microprocessor receives the input current to output a fourth control signal based on the input current.

[0019] Furthermore, the first voltage and current sampling device, the second voltage and current sampling device and the third voltage and current sampling device include sampling resistors, current sensors and / or voltage sensors.

[0020] Furthermore, the voltage conversion circuit further includes a fourth voltage and current sampling device and a fifth voltage and current sampling device. The fourth voltage and current sampling device is connected in series between the first charging interface and the ground terminal, and the fourth voltage and current sampling device is used to monitor the current of the first charging interface; the fifth voltage and current sampling device is connected in series between the second charging interface and the ground terminal, and the fifth voltage and current sampling device is used to monitor the current of the second charging interface.

[0021] Further, the first DCDC converter and the second DCDC converter are BUCK-BOOST converters.

[0022] A second aspect of the present application provides a mobile power supply, which includes at least two charging interfaces, a battery, and a voltage conversion circuit as described above. The voltage conversion circuit electrically connects the at least two charging interfaces and the battery. The mobile power supply receives input current from one or more of the at least two charging interfaces through the voltage conversion circuit, or the mobile power supply outputs the output current of the battery using one or more of the at least two charging interfaces through the voltage conversion circuit.

[0023] Different from the prior art, the voltage conversion circuit of the present application includes a first DCDC converter and a second DCDC converter arranged in parallel, and is provided with a switch component connected in parallel between the first DCDC converter and the second DCDC converter. The microprocessor controls the on and off of the switch component so that at least one of the first DCDC converter and the second DCDC converter is in a working state. In particular, the first DCDC converter and the second DCDC converter can output current at the same time. The parallel structure of the first DCDC converter and the second DCDC converter of the present application can distribute the heat loss generated by a single DCDC converter during high-power charging to the first DCDC converter and the second DCDC converter, thereby achieving a better heat distribution effect and meeting the needs of small-volume heat dissipation.

[0024] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 is a circuit structure diagram of the first embodiment of the voltage conversion circuit of the present application;

[0027] Figure 2 is a circuit structure diagram of a second embodiment of the voltage conversion circuit of the present application;

[0028] Figure 3 is a circuit structure diagram of a third embodiment of the voltage conversion circuit of the present application;

[0029] Figure 4 is a circuit structure diagram of a fourth embodiment of the voltage conversion circuit of the present application;

[0030] Figure 5 is a schematic diagram of a specific circuit structure of the first DCDC converter of the present application;

[0031] Figure 6 is a schematic diagram of a specific circuit structure of the second DCDC converter of the present application;

[0032] Figure 7 It is a structural schematic diagram of an embodiment of a mobile power supply of the present application. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present application, the voltage conversion circuit and mobile power supply provided by the present application are further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It can be understood that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0034] The terms "first", "second", etc. in this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0035] When the existing mobile power supply is charged at high power, the DCDC converter responsible for realizing voltage conversion is subjected to excessive current stress, resulting in excessive loss on the conversion line and a sharp increase in heat, which in turn makes it impossible to reduce the size of the mobile power supply. At the same time, the high loss leads to a higher operating temperature, which threatens the safety of the battery cell and causes the shell temperature to rise, affecting the user experience. The present application provides a voltage conversion circuit, which realizes the control of the two DCDC converters to output current at the same time by setting a parallel architecture of two DCDC converters, and achieves a better heat distribution effect by allocating the heat loss to the two DCDC converters, thereby meeting the needs of small-volume heat dissipation.

[0036] Specifically, see Figure 1 , Figure 1 Schematic diagram of the circuit structure of the first embodiment of the voltage conversion circuit of the present application. Figure 1 As shown, the voltage conversion circuit 1 of this embodiment includes a first DCDC converter 111, a second DCDC converter 112, a microprocessor 12 and a switch component 13, wherein the voltage conversion circuit 1 of this embodiment is connected between the battery 30 and the charging interface, and is used to convert the first charging voltage input by the charging interface to charge the battery 30; or, the voltage conversion circuit 1 of this embodiment is used to convert the second charging voltage output by the battery 30 to charge an electronic device connected to the charging interface.

[0037] Optionally, the charging interface of this embodiment includes a first charging interface 21 and a second charging interface 22, which are respectively connected to different external devices or external power sources.

[0038] Specifically, the first end of the first DCDC converter 111 of this embodiment is connected to the battery 30, and the second end of the first DCDC converter 111 is connected to the first charging interface 21, so as to connect an external power supply or an external device through the first charging interface 21, wherein the external power supply connected to the first charging interface 21 is used to charge the battery 30, or the battery 30 charges the external device connected to the first charging interface 21.

[0039] The second DCDC converter 112 is arranged in parallel with the first DCDC converter 111, and the first end of the second DCDC converter 112 is connected to the battery 30, and the second end of the second DCDC converter 112 is connected to the second charging interface 22, so as to connect an external power supply or an external device through the second charging interface 22, wherein the external power supply connected to the second charging interface 22 is used to charge the battery 30, or the battery 30 charges the external device connected to the second charging interface 22.

[0040] Optionally, in this embodiment, the external devices connected to the first charging interface 21 and the second charging interface 22 may be devices of the same type or devices of different types, and the first DCDC converter 111 and the second DCDC converter 112 operate independently. When the first DCDC converter 111 charges the first external device through the first charging interface 21, the second DCDC converter 112 can simultaneously charge the second external device through the second charging interface 22.

[0041] The switch component 13 is connected in parallel between the first DCDC converter 111 and the second DCDC converter 112. Specifically, the two ends of the switch component 13 can be connected to the first end of the first DCDC converter 111 and the first end of the second DCDC converter 112, respectively. By controlling the switch component 13, it is possible to control whether the battery 30 receives the charging current input by the first DCDC converter 111 and the second DCDC converter 112, thereby controlling the charging voltage received by the battery 30. Alternatively, the two ends of the switch component 13 can be connected to the second end of the first DCDC converter 111 and the second end of the second DCDC converter 112, respectively, and by controlling the switch component 13, it is possible to control the operation of the corresponding DCDC converter connected to the external device.

[0042] The microprocessor 12 is connected to the switch component 13, and controls the on and off of the switch component 13 so that at least one of the first DCDC converter 111 and the second DCDC converter 112 is in a working state. Specifically, when only a single external device is connected to the voltage conversion circuit 1 through the first charging interface 21 or the second charging interface 22, the microprocessor 12 can control the first DCDC converter 111 or the second DCDC converter 112 corresponding to the external device to be in a working state, so as to convert the second charging voltage output by the battery 30 into the rated charging voltage of the external device, and complete the charging of the external device.

[0043] Optionally, the first charging interface 21 and the second charging interface 22 of this embodiment are both TYPE-C interfaces. That is, when a single external device is connected to the voltage conversion circuit 1, the battery 30 can also realize high-power charging of the external device through the first charging interface 21 or the second charging interface 22, thereby improving the charging efficiency.

[0044] The voltage conversion circuit 1 of the present application can distribute the heat loss generated by a single DCDC converter during high-power charging to the first DCDC converter 111 and the second DCDC converter 112 by designing a parallel architecture of the first DCDC converter 111 and the second DCDC converter 112, thereby achieving a better heat distribution effect.

[0045] On the other hand, the present application realizes the miniaturization of the filter inductor / capacitor through the parallel operation of the first DCDC converter 111 and the second DCDC converter 112, and since the parallel architecture of the first DCDC converter 111 and the second DCDC converter 112 can be applied to low-voltage input and high-power output scenarios, the battery string requirement can be reduced compared to the traditional high-power output solution that requires more battery strings. Under the same power output conditions, fewer strings of battery cells can be used, thereby achieving the effect of reducing the volume.

[0046] In summary, the electronic device using the voltage conversion circuit 1 of the present application can achieve the effect of small size and good heat dissipation.

[0047] Combination Figure 1 , please refer to Figure 2 , Figure 2 Schematic diagram of the circuit structure of the second embodiment of the voltage conversion circuit of the present application. Figure 2 As shown, the switch component 13 of this embodiment includes a first switch tube MOS1, a second switch tube MOS2 and a third switch tube MOS3, wherein the first switch tube MOS1, the second switch tube MOS2 and the third switch tube MOS3 can be NMOS tubes, PMOS tubes or other switch elements that can realize circuit conduction or cutoff.

[0048] Specifically, the control end of the first switch tube MOS1 is connected to the microprocessor 12 to receive the first control signal MOS1_G output by the microprocessor 12; the first end of the first switch tube MOS1 is connected to the second end of the first DCDC converter 111, and the second end of the first switch tube MOS1 is connected to the first charging interface 21.

[0049] The control end of the second switch tube MOS2 is connected to the microprocessor 12 to receive the second control signal MOS2_G output by the microprocessor 12 ; the first end of the second switch tube MOS2 is connected to the second end of the second DCDC converter 112 , and the second end of the second switch tube MOS2 is connected to the second charging interface 22 .

[0050] The control end of the third switch tube MOS3 is connected to the microprocessor 12 to receive the third control signal MOS3_G output by the microprocessor 12; the first end of the third switch tube MOS3 is connected to the first end of the first switch MOS1, and the second end of the third switch tube MOS3 is connected to the first end of the second switch tube MOS2.

[0051] Furthermore, the voltage conversion circuit 1 of the present embodiment further includes a voltage and current sampling device, which is connected in series between the first DCDC converter 111 and the first charging interface 21 to detect the first output current of the first DCDC converter 111, and the voltage and current sampling device is connected in series between the second DCDC converter 112 and the second charging interface 22 to detect the second output current of the second DCDC converter 112.

[0052] The microprocessor 12 receives the first output current and the second output current output by the voltage and current sampling device, and adjusts the output voltage of the first DCDC converter 111 and / or the second DCDC converter 112 based on the first output current, the second output current and the working state of the third switch tube MOS3, thereby adjusting the output power of each DCDC converter to ensure that there is no large deviation in the output power of the two DCDC converters, and finally reaches a balanced state, so that the generated heat loss is evenly distributed to the two DCDC converters.

[0053] Specifically, Figure 2 As shown, the voltage and current sampling device of this embodiment includes a first voltage and current sampling device R1 and a second voltage and current sampling device R2, wherein two ends of the first voltage and current sampling device R1 are respectively connected to the second end of the first DCDC converter 111 and the first end of the first switch tube MOS1, and two ends of the second voltage and current sampling device R2 are respectively connected to the second end of the second DCDC converter 112 and the first end of the second switch tube MOS2.

[0054] Optionally, the first voltage and current sampling device R1 and the second voltage and current sampling device R2 include sampling resistors, current sensors and / or voltage sensors.

[0055] In this embodiment, the first voltage and current sampling device R1 and the second voltage and current sampling device R2 are sampling resistors, and the first output current may be the currents Is1+ and Is1- at both ends of the first voltage and current sampling device R1. The output voltage of the first DCDC converter 111 may be calculated by further combining the resistance value of the first voltage and current sampling device R1; the second output current may be the currents Is2+ and Is2- at both ends of the second voltage and current sampling device R2. The output voltage of the second DCDC converter 112 may be calculated by further combining the resistance value of the second voltage and current sampling device R2.

[0056] At the same time, the microprocessor 12 is respectively connected to the two ends of the first voltage and current sampling device R1 and the two ends of the second voltage and current sampling device R2 to receive the first output current output by the first voltage and current sampling device R1, that is, the current Is1+ and Is1- at the two ends of the first voltage and current sampling device R1, and receive the second output current output by the second voltage and current sampling device R2, that is, the current Is2+ and Is2- at the two ends of the second voltage and current sampling device R2.

[0057] Furthermore, the microprocessor 12 of this embodiment monitors the first output current and the second output current, and transmits a control signal to the first DCDC converter 111 and / or the second DCDC converter 112 via I2C communication in real time, thereby adjusting the output voltage of each DCDC converter.

[0058] Specifically, when a single charging interface outputs high power, when the dual-channel DCDC converters work in parallel, the microprocessor 12 controls the third switch tube MOS3 to turn on, and controls one of the first switch tube MOS1 or the second switch tube MOS2 to turn on, and controls the other of the first switch tube MOS1 or the second switch tube MOS2 to turn off. At this time, the output power of the two DCDC converters can be combined into one output port.

[0059] When the first charging interface 21 and the second charging interface 22 need to output voltage at the same time, the microprocessor 12 controls the third switch tube MOS3 to turn off, and controls the first switch tube MOS1 and the second switch tube MOS2 to turn on, so as to realize the independent operation of the two DCDC converters. The microprocessor 12 performs independent control through each sampling signal.

[0060] The voltage conversion circuit 1 of this embodiment uses two DCDC converters to work in parallel. The microprocessor 12 monitors the collected signals of the current and voltage sampling device to realize the distribution of the power of the charging interface in two parallel or independent operation, so as to achieve the purpose of parallel operation, realize the flexible switching of single-channel operation and dual-channel operation, reduce the loss caused by the dual-channel DCDC converter when it is unloaded or lightly loaded, and achieve the optimization of standby power consumption and light-load loss. Compared with the traditional single-channel DCDC operation, the voltage conversion circuit 1 of this embodiment can reduce the volume of the filter inductor / capacitor, reduce the stress of the power switch device, and reduce the loss caused by the large current, thereby improving the conversion efficiency of the voltage conversion circuit 1.

[0061] Combination Figure 1 , please refer to Figure 3 , Figure 3 Schematic diagram of the circuit structure of the third embodiment of the voltage conversion circuit of the present application. Figure 3As shown, the switch component 13 of this embodiment includes a fourth switch tube MOS4, the control end of the fourth switch tube MOS4 is connected to the microprocessor 12 to receive the fourth control signal MOS4_G output by the microprocessor 12; the first end of the fourth switch tube MOS4 is connected to the first end of the first DCDC converter 111, and the second end of the fourth switch tube MOS4 is connected to the first end of the second DCDC converter 112.

[0062] like Figure 3 As shown, the voltage conversion circuit 1 of this embodiment further includes a third voltage and current sampling device R3, a first end of the third voltage and current sampling device R3 is connected to the battery 30, and a second end of the third voltage and current sampling device R3 is connected to the first end of the first DCDC converter 111 and the first end of the fourth switch tube MOS4, for detecting the input current of the battery 30; wherein the microprocessor 12 receives the input current to output a fourth control signal MOS4_G based on the input current.

[0063] Optionally, the third voltage and current sampling device R3 includes a sampling resistor, a current sensor and / or a voltage sensor. In this embodiment, the third voltage and current sampling device R3 is a sampling resistor, and the input current can be the current Is3+ and Is3- at both ends of the third voltage and current sampling device R3. The input voltage of the battery 30 can be calculated by further combining the resistance value of the third voltage and current sampling device R3.

[0064] At the same time, the microprocessor 12 is connected to both ends of the third voltage and current sampling device R3 to receive the input current of the battery 30 output by the third voltage and current sampling device R3, ie, the currents Is3+ and Is3- at both ends of the third voltage and current sampling device R3.

[0065] Specifically, the voltage conversion circuit 1 of this embodiment is connected to an external power supply. When the battery 30 is charged through the external circuit, the microprocessor 12 monitors the input current and can control the parallel charging operation through the fourth switch tube MOS4 to adapt to different charging power requirements. It can also realize flexible switching between single-channel operation and dual-channel operation, reduce the loss caused by the dual-channel DCDC when it is no-load or light-loaded, and achieve the optimization of standby power consumption and light-load loss.

[0066] This application also provides another voltage conversion circuit, please refer to Figure 4 , Figure 4 Schematic diagram of the circuit structure of the fourth embodiment of the voltage conversion circuit of the present application. Figure 4 As shown, the voltage conversion circuit of this embodiment may include Figure 2 The first switch tube MOS1, the second switch tube MOS2, the third switch tube MOS3, the first voltage and current sampling device R1 and the second voltage and current sampling device R2, and Figure 3The fourth switch tube MOS4 and the third voltage and current sampling device R3 are shown. The specific connection structure of the above circuit elements can be as described in the above embodiment, which will not be repeated here.

[0067] Specifically, the voltage conversion circuit 1 of this embodiment is connected to an external power supply. When the battery 30 is charged through the external circuit, the microprocessor 12 monitors the input current and can control the parallel charging operation through the fourth switch tube MOS4. At the same time, the conversion between single-port charging and dual-port charging can be achieved by controlling the first switch tube MOS1 and the second switch tube MOS2, which can reduce the high loss of the DCDC converter caused by the large current during high-power charging and improve the charging speed.

[0068] like Figure 4 As shown, the voltage conversion circuit 1 of this embodiment further includes a fourth voltage and current sampling device R4 and a fifth voltage and current sampling device R5, the fourth voltage and current sampling device R4 is connected in series between the first charging interface 21 and the ground terminal, and the fifth voltage and current sampling device R5 is connected in series between the second charging interface 22 and the ground terminal. Optionally, the fourth voltage and current sampling device R4 and the fifth voltage and current sampling device R5 may include a sampling resistor, a current sensor and / or a voltage sensor. In this embodiment, the fourth voltage and current sampling device R4 and the fifth voltage and current sampling device R5 are specifically sampling resistors.

[0069] Specifically, a first end of the fourth voltage and current sampling device R4 is connected to the first charging interface 21, a second end of the fourth voltage and current sampling device R4 is grounded, and the fourth voltage and current sampling device R4 is used to monitor the current Is4 of the first charging interface 21; a first end of the fifth voltage and current sampling device R5 is connected to the second charging interface 22, a second end of the fifth voltage and current sampling device R5 is grounded, and the fifth voltage and current sampling device R5 is used to monitor the current Is5 of the second charging interface 22.

[0070] Optionally, the microprocessor 12 may respectively obtain the current Is4 of the first charging interface 21 and the current Is5 of the second charging interface 22 through the fourth voltage and current sampling device R4 and the fifth voltage and current sampling device R5, and combine the first output current obtained by the first voltage and current sampling device R1, the second output current obtained by the second voltage and current sampling device R2, and the input current obtained by the third voltage and current sampling device R3 to realize voltage and current monitoring of the entire circuit of the voltage conversion circuit 1.

[0071] Furthermore, the first DCDC converter 111 and the second DCDC converter 112 of this embodiment are BUCK-BOOST converters. Figure 4 , please refer to Figure 5 and Figure 6 , Figure 5is a schematic diagram of a specific circuit structure of the first DCDC converter of the present application; Figure 6 It is a schematic diagram of the specific circuit structure of the second DCDC converter of the present application.

[0072] like Figure 5 As shown, the first DCDC converter 111 includes an inductor L1, a capacitor C1, a capacitor C2, a switch tube Q1, a switch tube Q2, a switch tube Q3 and a switch tube Q4. The first end of the inductor L1 is connected to the first end of the capacitor C1, the second end of the switch tube Q1 and the first end of the switch tube Q2. The second end of the inductor L1 is connected to the first end of the capacitor C2, the second end of the switch tube Q3 and the first end of the switch tube Q4. The second end of the capacitor C1 is connected to the first end of the switch tube Q1, the second end of the capacitor C2 and the first end of the switch tube Q3. The second end of the switch tube Q2 is connected to the second end of the switch tube Q4 and is further grounded.

[0073] like Figure 6 As shown, the second DCDC converter 112 includes an inductor L2, a capacitor C3, a capacitor C4, a switch tube Q5, a switch tube Q6, a switch tube Q7 and a switch tube Q8. The first end of the inductor L2 is connected to the first end of the capacitor C3, the second end of the switch tube Q5 and the first end of the switch tube Q6. The second end of the inductor L2 is connected to the first end of the capacitor C4, the second end of the switch tube Q7 and the first end of the switch tube Q8. The second end of the capacitor C3 is connected to the first end of the switch tube Q5, the second end of the capacitor C4 and the first end of the switch tube Q7. The second end of the switch tube Q6 is connected to the second end of the switch tube Q8 and is further grounded.

[0074] This application also provides a mobile power supply, please refer to Figure 7 , Figure 7 Schematic diagram of the structure of an embodiment of the mobile power supply of the present application. Figure 7 As shown, the mobile power supply 20 of this embodiment includes at least two charging interfaces 203, a battery 202 and a voltage conversion circuit 201, wherein the charging interface 203 of this embodiment can be the first charging interface 21 and / or the second charging interface 22 described in any of the above embodiments, the battery 202 can be the battery 30 described in any of the above embodiments, and the voltage conversion circuit 201 can be the voltage conversion circuit 1 described in any of the above embodiments, which will not be repeated here.

[0075] Specifically, the voltage conversion circuit 201 of this embodiment electrically connects at least two charging interfaces 203 and the battery 202. The mobile power supply 20 receives the input current of one or more charging interfaces 203 of at least two charging interfaces 203 through the voltage conversion circuit 201 to complete the charging of the battery 202, or the mobile power supply 20 uses the voltage conversion circuit 201 to output the output current of the battery 202 using one or more charging interfaces 203 of at least two charging interfaces 203 to complete the charging of an external device connected to the charging interface 203.

[0076] The above are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A voltage conversion circuit, characterized in that: include: A first DCDC converter, wherein a first end of the first DCDC converter is connected to a battery, and a second end of the first DCDC converter is connected to a first charging interface; a second DCDC converter, connected in parallel with the first DCDC converter, wherein a first end of the second DCDC converter is connected to the battery, and a second end of the second DCDC converter is connected to a second charging interface, wherein the first charging interface and the second charging interface are used to connect to an external power source or an external device; A switch component connected in parallel between the first DCDC converter and the second DCDC converter; A microprocessor is connected to the switch component, and is used for controlling the on-off of the switch component so that at least one of the first DCDC converter and the second DCDC converter is in a working state.

2. The voltage conversion circuit according to claim 1, characterized in that: The switch assembly includes a first switch tube, a second switch tube and a third switch tube. The control end of the first switch tube is connected to the microprocessor to receive a first control signal output by the microprocessor; the first end of the first switch tube is connected to the second end of the first DCDC converter, and the second end of the first switch tube is connected to the first charging interface; The control end of the second switch tube is connected to the microprocessor to receive a second control signal output by the microprocessor; the first end of the second switch tube is connected to the second end of the second DCDC converter, and the second end of the second switch tube is connected to the second charging interface; The control end of the third switch tube is connected to the microprocessor to receive a third control signal output by the microprocessor; the first end of the third switch tube is connected to the first end of the first switch tube, and the second end of the third switch tube is connected to the first end of the second switch tube.

3. The voltage conversion circuit according to claim 2, characterized in that: The voltage conversion circuit further includes a voltage and current sampling device, which is connected in series between the first DCDC converter and the first charging interface to detect the first output current of the first DCDC converter, and the voltage and current sampling device is connected in series between the second DCDC converter and the second charging interface to detect the second output current of the second DCDC converter; The microprocessor receives the first output current and the second output current output by the voltage and current sampling device, and adjusts the output voltage of the first DCDC converter and / or the second DCDC converter based on the first output current, the second output current and the working state of the third switch tube.

4. The voltage conversion circuit according to claim 3, characterized in that: The voltage and current sampling device includes a first voltage and current sampling device and a second voltage and current sampling device, wherein two ends of the first voltage and current sampling device are respectively connected to the second end of the first DCDC converter and the first end of the first switch tube, and two ends of the second voltage and current sampling device are respectively connected to the second end of the second DCDC converter and the first end of the second switch tube.

5. The voltage conversion circuit according to claim 4, characterized in that: The switch component further includes a fourth switch tube, a control end of the fourth switch tube is connected to the microprocessor to receive a fourth control signal output by the microprocessor; a first end of the fourth switch tube is connected to the first end of the first DCDC converter, and a second end of the fourth switch tube is connected to the first end of the second DCDC converter.

6. The voltage conversion circuit according to claim 5, characterized in that: The voltage conversion circuit further includes a third voltage and current sampling device, a first end of the third voltage and current sampling device is connected to the battery, and a second end of the third voltage and current sampling device is connected to the first end of the first DCDC converter and the first end of the fourth switch tube, for detecting the input current of the battery; wherein the microprocessor receives the input current to output the fourth control signal based on the input current.

7. The voltage conversion circuit according to claim 6, characterized in that: The first voltage and current sampling device, the second voltage and current sampling device and the third voltage and current sampling device include sampling resistors, current sensors and / or voltage sensors.

8. The voltage conversion circuit according to claim 1, characterized in that: The voltage conversion circuit further includes a fourth voltage and current sampling device and a fifth voltage and current sampling device. The fourth voltage and current sampling device is connected in series between the first charging interface and the ground terminal, and the fourth voltage and current sampling device is used to monitor the current of the first charging interface; the fifth voltage and current sampling device is connected in series between the second charging interface and the ground terminal, and the fifth voltage and current sampling device is used to monitor the current of the second charging interface.

9. The voltage conversion circuit according to claim 1, characterized in that: The first DCDC converter and the second DCDC converter are BUCK-BOOST converters.

10. A mobile power source, characterized in that: The mobile power supply includes at least two charging interfaces, a battery, and a voltage conversion circuit as described in any one of claims 1 to 9, wherein the voltage conversion circuit electrically connects the at least two charging interfaces and the battery, and the mobile power supply receives input current from one or more of the at least two charging interfaces through the voltage conversion circuit, or the mobile power supply outputs the output current of the battery using one or more of the at least two charging interfaces through the voltage conversion circuit.

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