The charge pump drive circuit, charge pump, chip, and fast charging system

Abstract

This application provides a drive circuit for a charge pump, a charge pump, a chip, and a fast charging system. The drive circuit includes a first switch, a second switch, a third switch, a fourth switch, a first capacitor, a control circuit, and a power supply circuit. The detection logic circuit of the drive circuit sends a first control command to the control circuit and a second control command to both the control circuit and the power supply circuit. When the first control command indicates that the charge pump is not working, the control circuit grounds the third terminal and the body terminal of the second switch to disconnect the path for the output voltage to transmit the power supply voltage through the first and second switches. The power supply circuit provides a first voltage to the control circuit when the second control command indicates that the charge pump is working. This application ensures that the charge pump operates and avoids leakage from the output voltage to the power supply voltage path when the charge pump is not working, thereby reducing power consumption of devices connected to the output voltage.

Description

Technical Field

[0001] This application relates to the field of fast charging technology, and in particular to a charge pump drive circuit, a charge pump, a chip, and a fast charging system. Background Technology

[0002] In fast charging devices, charge pumps are typically used to provide higher voltage or current output to the circuit by periodically transferring charge. In existing technology, when the charge pump is not operating, a power transistor needs to be controlled to disconnect the circuit within the charge pump. However, because there are multiple circuits in the charge pump, it is difficult to completely disconnect them, causing the power output to flow to the power input, resulting in the static power consumption of the main charging unit consuming power from the connected devices. Summary of the Invention

[0003] This application provides a drive circuit for a charge pump, a charge pump, a chip, and a fast charging system. When the charge pump is not working, the path of the drive circuit can be disconnected, thereby reducing the power consumption at the power output terminal.

[0004] In a first aspect, this application provides a driving circuit for a charge pump, which is applied to a charge pump. The charge pump includes: a first switching transistor, a second switching transistor, a third switching transistor, a fourth switching transistor, a first capacitor, a control circuit, a power supply circuit, and a detection logic circuit.

[0005] The first, second, third, and fourth switching transistors are connected in series between the power input terminal and ground. The first capacitor is connected in parallel between the first terminal of the second switching transistor and the second terminal of the third switching transistor. The third terminal of the second switching transistor is connected to the first terminal of the control circuit. The body terminal of the second switching transistor is connected to the second terminal of the control circuit. The third terminal of the control circuit is connected to the first terminal of the detection logic circuit. The fourth terminal of the control circuit is connected to the first terminal of the power supply circuit. The fifth terminal of the control circuit is connected between the second terminal of the second switching transistor and the first terminal of the third switching transistor. The second terminal of the detection logic circuit is connected to the second terminal of the power supply circuit.

[0006] The detection logic circuit is used to send the first control command to the control circuit;

[0007] The control circuit is used to ground the third terminal of the second switch and the body terminal of the second switch when the first control command indicates that the charge pump is not working, so as to disconnect the path for the output voltage to transmit the power supply voltage through the first switch and the second switch.

[0008] The detection logic circuit is also used to send second control commands to the control circuit and power supply circuit;

[0009] A power supply circuit is used to provide a first voltage to the control circuit when the second control command indicates that the charge pump is to operate;

[0010] The control circuit is also used to control the second switch to alternately turn on or off when the second control command indicates that the charge pump is working; wherein, when the second switch is on, the third terminal of the second switch is electrically connected to the first voltage; when the second switch is off, the third terminal of the second switch is electrically connected to the output voltage.

[0011] Based on this, when the charge pump is not working, the detection logic circuit sends a first control command to the control circuit. Based on the first control command, the control circuit disconnects the path of electricity flowing through the body terminal and gate of the second switching transistor, preventing electricity from flowing from the power output terminal to the power input terminal via the second switching transistor. When the charge pump is working, the detection logic circuit sends a second control command to the control circuit and the power supply circuit. Based on the second control command, the power supply circuit provides a first voltage to the control circuit. Based on the second control command and the first voltage, the control circuit alternately turns the second switching transistor on or off, enabling the charge pump to perform voltage conversion. Therefore, the driving circuit, charge pump, and fast charging system including the charge pump proposed in this application can operate normally and, when the charge pump is not working, can reduce or even avoid power consumption of the electrical equipment connected to the power output terminal. By disconnecting the path from the power output terminal to the power input terminal, the main charging unit cannot generate static power consumption, thereby reducing the power loss of the fast charging system.

[0012] In one possible design, the control circuit includes a control-stage switching transistor group, an intermediate-stage switching transistor group, and a path-stage switching transistor group.

[0013] The control-level switch group is electrically connected to the power supply circuit, the detection logic circuit, and the intermediate-level switch group, respectively. The intermediate-level switch group is also electrically connected to the second switch, and the path-level switch group is electrically connected to the second switch.

[0014] When the first control command indicates that the charge pump is not working, the control stage switch group is in the first state, the intermediate stage switch group is in the second state, and the path stage switch group is in the third state, so as to ground the third terminal of the second switch and the body terminal of the second switch.

[0015] When the second control command indicates that the charge pump is operating, the control stage switch group is in the fourth state, the intermediate stage switch group is in the fifth state, and the path stage switch group is in the sixth state to control the second switch to be turned on. Alternatively, the control stage switch group may be in the fourth state, the intermediate stage switch group in the seventh state, and the path stage switch group in the sixth state to control the second switch to be turned off. In one possible design, the control stage switch group includes an eighth and ninth switch, the intermediate stage switch group includes a fifth, sixth, and seventh switch, and the path stage switch group includes a tenth, twelfth, and eleventh switch.

[0016] The first terminal of the fifth switch is electrically connected to the first terminal of the power supply circuit. The second terminal of the fifth switch is electrically connected to the first terminal of the sixth switch. The second terminal of the sixth switch is electrically connected to the first terminal of the seventh switch. The second terminal of the seventh switch outputs the voltage. The first terminal of the eighth switch is electrically connected between the first terminal of the power supply circuit and the first terminal of the fifth switch. The second terminal of the eighth switch is electrically connected to the first terminal of the ninth switch. The second terminal of the ninth switch is grounded. The third terminals of the fifth and seventh switches are electrically connected to the first terminal of the detection logic circuit, respectively. The third terminal of the sixth switch is electrically connected between the second terminal of the eighth switch and the ninth switch. Between the first ends of the switching transistors, the first connection point is electrically connected to the third end of the second switching transistor. The first connection point is located between the second end of the fifth switching transistor and the first end of the sixth switching transistor. The first end of the tenth switching transistor is electrically connected between the first connection point and the third end of the second switching transistor. The second end of the tenth switching transistor is grounded. The first end of the eleventh switching transistor is electrically connected to the body terminal of the second switching transistor. The second end of the eleventh switching transistor is grounded. The first end of the twelfth switching transistor is electrically connected between the body terminal of the second switching transistor and the first end of the eleventh switching transistor. The second end of the twelfth switching transistor is electrically connected between the second end of the second switching transistor and the first end of the third switching transistor.

[0017] By employing a control circuit, when the charge pump is not working, the detection logic circuit controls the control circuit to disconnect all paths of the second switching transistor, so that the power output terminal will not flow to the power input terminal through the drive circuit.

[0018] In one possible design, the driving circuit of this application further includes: a current detection circuit;

[0019] The conductive trace between the power supply voltage and the first terminal of the first switching transistor forms a first impedance. The first and second terminals of the current detection circuit are electrically connected between the first impedance. The third terminal of the current detection circuit is grounded. The fourth terminal of the current detection circuit is connected to the third voltage.

[0020] The current detection circuit is used to output a third voltage, which is used to indicate relevant information about the input current.

[0021] The input current is detected by the current detection circuit and transmitted to the detection logic circuit. The detection logic circuit provides reference information for the control, adjustment and fault diagnosis of the drive circuit based on the input current information.

[0022] In one possible design, the current sensing circuit includes: a first resistor, an operational amplifier, a thirteenth transistor, and a second resistor;

[0023] The first end of the first resistor is electrically connected between the first end of the first impedance and the power supply voltage. The second end of the first resistor is electrically connected to the first end of the thirteenth transistor. The first input terminal of the operational amplifier is electrically connected between the second end of the first resistor and the first end of the thirteenth transistor. The second input terminal of the operational amplifier is electrically connected between the second end of the first impedance and the first end of the first switching transistor. The second end of the thirteenth transistor is electrically connected to the first end of the second resistor. The second end of the second resistor is grounded. The output terminal of the operational amplifier is electrically connected to the third end of the thirteenth transistor. The body terminal of the thirteenth transistor is electrically connected to the second end of the thirteenth transistor. The body terminal or the second end of the thirteenth transistor is connected to a third voltage.

[0024] In the current detection circuit, the input current signal is converted into a measurable voltage signal by a sampling operational amplifier, and then the voltage signal is amplified. This enables accurate detection of the input current information.

[0025] In one possible design, the first resistor uses a serpentine conductive trace.

[0026] Using a serpentine conductive trace for the first resistor can reduce external interference, increase the resistance value of the first resistor to reduce the value of the induced current, and improve the detection efficiency of the current detection circuit.

[0027] In one possible design, the driving circuit of this application further includes: a second capacitor;

[0028] The second capacitor is connected in parallel between the second connection point and the third terminal of the power supply circuit. The second connection point is located between the second terminal of the first switching transistor and the first terminal of the second switching transistor. The third terminal of the detection logic circuit is connected between the second terminal of the second switching transistor and the first terminal of the third switching transistor.

[0029] The detection logic circuit is also used to charge the second capacitor by output voltage when the charge pump is not working;

[0030] The detection logic circuit is also used to control the discharge of the second capacitor when the charge pump is working.

[0031] Therefore, using a second capacitor allows the power output to pass through the detection logic circuit, then through the power supply circuit, and finally to the second capacitor to charge it. This enables the power output to be reused, further reducing power loss at the power output.

[0032] In one possible design, the detection logic circuit includes: a fifteenth switch and a sixteenth switch;

[0033] The first terminal of the fifteenth switch is electrically connected to the second terminal of the detection logic circuit, the second terminal of the fifteenth switch is electrically connected to the first terminal of the sixteenth switch, and the second terminal of the sixteenth switch is electrically connected to the third terminal of the detection logic circuit.

[0034] Secondly, this application provides a charge pump, comprising: a first switching transistor, a second switching transistor, a third switching transistor, a fourth switching transistor, a first capacitor, and a driving circuit as described above.

[0035] Thirdly, this application provides a chip, including: a driving circuit as described in any of the above, or a charge pump.

[0036] Fourthly, this application provides a fast charging system, including: a main charging unit and one or more driving circuits as described above;

[0037] The first terminal of the main charging unit and the first terminal of the driving circuit are both connected to the power supply voltage, the second terminal of the main charging unit is connected to the system voltage, and the third terminal of the main charging unit and the second terminal of the driving circuit are both connected to the output voltage.

[0038] The main charging unit is used to provide system voltage and output voltage.

[0039] In one possible design, the fast charging system provided in this application further includes: a protection unit;

[0040] The protection unit is electrically connected between the third connection point and the output voltage. The third terminal of the main charging unit and the second terminal of the drive circuit are connected to the output voltage through the third connection point.

[0041] A protection unit is used to monitor and control at least one of the following parameters when the main charging unit and / or charge pump is operating: output voltage, output current at the output voltage terminal, and temperature of the fast charging system.

[0042] The beneficial effects provided in the second, third, and fourth aspects and the various possible designs of the second, third, and fourth aspects can be referred to in the beneficial effects of the first aspect and the various possible implementations of the first aspect, and will not be repeated here. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of a fast charging system structure according to an embodiment of this application;

[0044] Figure 2 This is a schematic diagram of a fast charging system circuit according to an embodiment of this application;

[0045] Figure 3 This is a schematic diagram of the structure of a charge pump drive circuit according to an embodiment of this application;

[0046] Figure 4 This is a schematic diagram of the circuit structure of the control circuit in the drive circuit of a charge pump according to an embodiment of this application.

[0047] Figure 5 This is a schematic diagram of the connection of the current detection circuit in the drive circuit of a charge pump according to an embodiment of this application.

[0048] Figure 6 This is a schematic diagram of the current detection circuit in the drive circuit of a charge pump according to an embodiment of this application.

[0049] Figure 7 This is a schematic diagram of another structure of a charge pump drive circuit according to an embodiment of this application;

[0050] Figure 8 This is a schematic diagram of the detection logic circuit in the drive circuit of a charge pump according to an embodiment of this application.

[0051] Explanation of reference numerals in the attached figures:

[0052] 10—Main charging unit; 20—charge pump; 30—protection unit; 211—power supply circuit; 212—control circuit; 213—detection logic circuit; 214—current detection circuit. Detailed Implementation

[0053] In this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c alone can mean: a alone, b alone, c alone, a combination of a and b, a combination of a and c, a combination of b and c, or a, b, and c, where a, b, and c can be single or multiple. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0054] The terms “center,” “longitudinal,” “lateral,” “up,” “down,” “left,” “right,” “front,” and “rear,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0055] The terms "connected" and "connected" should be interpreted broadly. For example, in circuit structures, "connected" or "connected" can refer not only to physical connections but also to electrical or signal connections. This could be a direct connection (physical connection) or an indirect connection via at least one intermediate component, as long as the circuit is connected. It could also refer to the internal connection between two components. Similarly, a signal connection can refer to a connection via a circuit or a medium, such as radio waves. Those skilled in the art will understand the specific meaning of these terms in this application based on the specific circumstances.

[0056] For example, this application provides a fast charging system.

[0057] Please see Figure 1 , Figure 1 This is a schematic diagram of a fast charging system structure provided in one embodiment of this application. Figure 1 As shown, the fast charging system may include: a main charging unit 10 and one or more charge pumps 20.

[0058] The first terminal of the main charging unit 10 and the first terminal of the charge pump 20 are both connected to the power supply voltage VBUS. The second terminal of the main charging unit 10 is connected to the system voltage VSYS. The third terminal of the main charging unit 10 and the second terminal of the charge pump 20 are both connected to the output voltage VOUT.

[0059] For the fast charging system, the power input terminal is used to connect to the power supply voltage VBUS, and is electrically connected to the first terminal of the main charging unit 10 and the first terminal of the charge pump 20. The power output terminal is used to connect to the output voltage VOUT, and is electrically connected to the third terminal of the main charging unit 10 and the second terminal of the charge pump 20.

[0060] Figure 1 In the diagram, the first end of the main charging unit 10 is denoted as 1, the second end of the main charging unit 10 is denoted as 2, the third end of the main charging unit 10 is denoted as 3, the first end of the charge pump 20 is denoted as 1, and the second end of the charge pump 20 is denoted as 2.

[0061] Fast charging systems are used to provide efficient and rapid charging for electrical devices. Figure 1 In this system, the fast charging system can provide output voltage VOUT and system voltage VSYS to the electrical equipment.

[0062] The system voltage VSYS is used to supply power to the device's system independently during use. The output voltage VOUT is used to provide fast charging for the device's battery. The main charging unit 10 and the charge pump 20 can simultaneously charge the device's battery through the output voltage VOUT, thereby further improving the charging speed. The device can be a mobile device, a vehicle charger, a portable power bank, or other electronic devices. Mobile devices can include mobile phones or tablets, while other electronic devices can include headphones, watches, wireless chargers, etc.

[0063] The main charging unit 10 provides the system voltage VSYS and the output voltage VOUT. Specifically, the first terminal of the main charging unit 10 is connected to the power supply voltage VBUS, and the VBUS voltage is converted. The converted voltage is then connected to the power-consuming device through the second terminal of the main charging unit 10, thereby providing the system voltage VSYS for the power-consuming device's system use. Additionally, the main charging unit 10 can simultaneously output the converted voltage through its second terminal to the power-consuming device connected to the power output terminal, thereby providing the output voltage VOUT to charge the device's battery.

[0064] In general, the main charging unit can usually perform the functions of a power management unit (PMU).

[0065] The charge pump 20 is used to provide the output voltage VOUT. Specifically, the first terminal of the charge pump 20 is connected to the power supply voltage VBUS and performs voltage conversion on the power supply voltage VBUS. The converted voltage is then output through the second terminal of the charge pump 20 to the electrical device connected to the power supply output terminal, thereby quickly charging the battery of the electrical device.

[0066] Furthermore, based on the above structure, the fast charging system of this application may also include a protection unit 30. The protection unit 30 is electrically connected between the third connection point and the power output terminal, and the third terminal of the main charging unit 10 and the second terminal of the charge pump 20 are connected to the output voltage VOUT through the third connection point.

[0067] Figure 1 In the diagram, the third connection point is denoted as Z.

[0068] The protection unit 30 is used to monitor and control at least one of the following parameters when the main charging unit 10 and / or the charge pump 20 are operating: output voltage VOUT, output current at the power output terminal, and temperature of the fast charging system.

[0069] The protection unit 30 monitors and controls the output voltage VOUT, ensuring the safety and stability of the device's battery charging process. Thus, by incorporating the protection unit 30, problems such as overcurrent, overvoltage, and overheating that may occur during fast charging system operation can be avoided.

[0070] To prevent damage to the fast charging system, extend battery life, and ensure user safety, the fast charging system implements a protection mechanism through protection unit 30. Protection unit 30 can implement the protection mechanism in the following ways:

[0071] (1) Temperature monitoring: The protection unit 30 can monitor the temperature of the fast charging system and provide feedback to the fast charging system when the temperature exceeds the safe range, so that the fast charging system can take protective measures in time. For example, when the temperature is too high, the fast charging system may reduce the charging power or suspend charging to avoid further heating.

[0072] (2) Current control: The protection unit 30 detects the output current at the power output terminal and sends the detection result to the main charging unit 10 and the charge pump 20 to avoid excessive current from damaging the battery of the electrical equipment connected to the output voltage VOUT and to ensure the charging safety of the electrical equipment.

[0073] (3) Voltage control: The protection unit 30 can detect the output voltage VOUT and send the detection result to the main charging unit 10 and the charge pump 20 to avoid damage to the battery of the electrical equipment caused by excessive or insufficient voltage.

[0074] Below, in conjunction with Figure 2 This section details a feasible implementation method for a fast charging system.

[0075] Please see Figure 2 , Figure 2 This is a schematic diagram of a fast charging system circuit according to an embodiment of this application. Figure 2 In this context, VBAT is the battery voltage, which is the output voltage VOUT mentioned in this application. The Buck Master charger is the main charging unit 10, the ChargePump is the charge pump 20, and the Protection IC is the protection unit 30.

[0076] In related technologies, when the charge pump is not working, the main charging unit will not disconnect the ground, signal input / output pins, etc., causing a small amount of electricity to flow through the components in the main charging unit, such as transistors. This results in impedance or capacitor leakage, which causes the main charging unit to generate static power consumption, leading to power loss in the fast charging system.

[0077] Currently, power loss due to static power consumption can typically be achieved by disconnecting the power output from the power input in a charge pump of a related technology. However, when the charge pump of a related technology is not operating, it is not possible to completely disconnect the power output from the power input.

[0078] Furthermore, in related technologies, the charge pump includes a power transistor, the first terminal of which is typically connected to the power input terminal, and the second terminal of which is connected to the first terminal of the upper transistor. In the charge pumps of related technologies, the power transistor has the following two functions:

[0079] (1) When the charge pump of the related technology is working, all the current input from the power input terminal in the charge pump needs to pass through the power transistor, which is in the normally-on state when the charge pump of the related technology is working. The power transistor can be used to sample the input current at the power input terminal.

[0080] (2) When the charge pump of the related technology is not working, the input is floating or short-circuited. At this time, simply disconnecting the power transistor will disconnect the path of the power output terminal to the power input terminal through the charge pump. This can prevent leakage from the power output terminal to the power input terminal and avoid the static power consumption of the main charging unit of the related technology consuming the power output terminal's power.

[0081] However, due to the large size of power transistors, using power transistors in charge pumps of related technologies will increase the overall size of the fast charging system.

[0082] To address the aforementioned issues, this application proposes a charge pump 20 and a drive circuit 210 for the charge pump 20. When the charge pump 20 is not operating, the path from the power output terminal to the power input terminal is completely disconnected, preventing the main charging unit 10 from generating static power consumption and effectively reducing power loss in the fast charging system. Furthermore, the components in the drive circuit 210 of the charge pump 20 can replace the power transistors in the drive circuits of charge pumps in related technologies, reducing the size or dimensions of the fast charging system and effectively saving on equipment and electricity costs.

[0083] Below, in conjunction with Figure 3 This paper details the specific implementation of the drive circuit 210 of the charge pump 20 in this application.

[0084] Please see Figure 3 , Figure 3 This is a schematic diagram of the drive circuit for a charge pump according to an embodiment of this application. Figure 3 As shown, the charge pump 20 may include: a first switch Q1, a second switch Q2, a third switch Q3, a fourth switch Q4, a first capacitor C1, and a driving circuit 210 for the charge pump 20. The charge pump 20 may be a chip, a circuit module, or a combination of a circuit module and a chip module.

[0085] The drive circuit 210 of the charge pump 20 includes a control circuit 212, a power supply circuit 211, and a detection logic circuit 213. The drive circuit 210 can be a chip, a circuit module, or a combination of a circuit module and a chip module.

[0086] A first switching transistor Q1, a second switching transistor Q2, a third switching transistor Q3, and a fourth switching transistor Q4 are connected in series between the power input terminal and ground. The first terminal of the first switching transistor Q1 is connected to the power supply voltage VBUS. The second terminal of the first switching transistor Q1 is electrically connected to the first terminal of the second switching transistor Q2. The second terminal of the second switching transistor Q2 is electrically connected to the first terminal of the third switching transistor Q3. An output voltage VOUT is connected between the second terminals of the second switching transistor Q2 and the first terminals of the third switching transistor Q3. The second terminal of the third switching transistor Q3 is electrically connected to the first terminal of the fourth switching transistor Q4. The second terminal of the fourth switching transistor Q4 is grounded. A first capacitor C1 is connected in parallel. The circuit is connected between the first terminal of the second switch Q2 and the second terminal of the third switch Q3. The third terminal of the second switch Q2 is electrically connected to the first terminal of the control circuit 212. The body terminal of the second switch Q2 is electrically connected to the second terminal of the control circuit 212. The third terminal of the control circuit 212 is electrically connected to the first terminal of the detection logic circuit 213. The fourth terminal of the control circuit 212 is electrically connected to the first terminal of the power supply circuit 211. The fifth terminal of the control circuit 212 is electrically connected between the second terminal of the second switch Q2 and the first terminal of the third switch Q3. The second terminal of the detection logic circuit 213 is electrically connected to the second terminal of the power supply circuit 211.

[0087] Figure 3 In the diagram, the first terminal of the first switch Q1 is denoted as 1, the second terminal of the first switch Q1 is denoted as 2, the first terminal of the second switch Q2 is denoted as 1, the second terminal of the second switch Q2 is denoted as 2, the third terminal of the second switch Q2 is denoted as 3, the first terminal of the third switch Q3 is denoted as 1, the second terminal of the third switch Q3 is denoted as 2, the first terminal of the fourth switch Q4 is denoted as 1, the second terminal of the fourth switch Q4 is denoted as 2, the first terminal of the power supply circuit 211 is denoted as 1, the second terminal of the power supply circuit 211 is denoted as 2, the first terminal of the control circuit 212 is denoted as 1, the second terminal of the control circuit 212 is denoted as 2, the third terminal of the control circuit 212 is denoted as 3, the fourth terminal of the control circuit 212 is denoted as 4, the fifth terminal of the control circuit 212 is denoted as 5, the first terminal of the detection logic circuit 213 is denoted as 1, and the second terminal of the detection logic circuit 213 is denoted as 2.

[0088] The four switching transistors, Q1, Q2, Q3, and Q4, can be field-effect transistors (FETs). These four transistors are used to turn the charge pump 20 on or off during operation, thereby completing the charging and discharging process of the first capacitor C1. This reduces the voltage, which the charge pump 20 then supplies to the device through its power output. For example, taking a 2:1 voltage reduction ratio of the charge pump 20, the four transistors can achieve a 2:1 ratio between the power supply voltage VBUS and the output voltage VOUT by using different duty cycles.

[0089] The second switch Q2 is also used to disconnect the charge pump 20 when it is not working, so that the power output cannot flow to the power input.

[0090] The detection logic circuit 213 is used to control the control circuit 212 via control commands to completely disconnect the entire path from the power output terminal to the power input terminal through the second switching transistor Q2. The control commands indicate whether the charge pump 20 is operating.

[0091] Furthermore, the detection logic circuit 213 is also used to generate switching control signals for all circuits in the charge pump 20, and to adjust the charge transfer of the charge pump 20 by controlling the control circuit 212. The detection logic circuit 213 may include a control chip.

[0092] Additionally, the detection logic circuit 213 adjusts the charge transfer in the charge pump 20 by controlling the control circuit 212. This can be achieved in the following manner:

[0093] In method (1), the detection logic circuit 213 can perform timing control: the detection logic circuit 213 drives the operation of the control circuit 212 by generating a switching control signal. The switching control signal is based on the clock signal or the state of the counter to determine when to turn on or off the switching transistor in the charge pump 20.

[0094] In method (2), the detection logic circuit 213 can control the switching transistor: the charge pump 20 transfers electricity by turning the switching transistor on or off. The detection logic circuit 213 generates appropriate switching transistor control signals according to specific conditions and timing to control the switching transistor to turn on or off, thereby realizing the direction of electricity transfer in the charge pump 20.

[0095] The power supply circuit 211 is used to provide the first voltage Q2_VDD required for the charge pump 20 to operate when the second control command indicates that the charge pump 20 is operating, so that the charge pump 20 converts the power supply voltage VBUS into the output voltage VOUT.

[0096] Based on the above description, the working principle of the drive circuit 210 will be described in detail below.

[0097] When the detection logic circuit 213 detects that the power supply voltage VBUS is less than a preset voltage and / or the input current Iin is less than a preset current, the detection logic circuit 213 can determine that the charge pump 20 is currently not working. At this time, the detection logic circuit 213 can send a first control command to the control circuit 212. When the first control command indicates that the charge pump 20 is not working, the control circuit 212 can ground the third terminal of the second switch Q2 and the body terminal of the second switch Q2 to disconnect all paths through the second switch Q2, so that the power output cannot flow from the body terminal and gate of the second switch Q2 to the power input terminal.

[0098] When the detection logic circuit 213 detects that the power supply voltage VBUS is greater than or equal to a preset voltage, and / or the input current Iin is greater than or equal to a preset current, the detection logic circuit 213 can determine that the charge pump 20 is currently operating normally. At this time, the detection logic circuit 213 can send a second control command to the control circuit 212 and the power supply circuit 212. When the second control command indicates that the charge pump 20 is operating, the power supply circuit 211 can provide a first voltage Q2_VDD to the control circuit 212, which can provide voltage assurance for the conduction of the second switch Q2. Furthermore, the control circuit 212 can control the second switch Q2 to turn on or off, completing the charging and discharging process of the first capacitor C1, so that the charge at the power input terminal flows to the power output terminal through the charge pump 20.

[0099] Wherein, the input current Iin is the current at the power input terminal.

[0100] Specifically, when the second switch Q2 is turned on, its third terminal is electrically connected to the first voltage Q2_VDD. When the second switch Q2 is turned off, its third terminal is electrically connected to the power supply output terminal.

[0101] The charge pump driving circuit provided in this application, when the charge pump is not working, detects a logic circuit sending a first control command to a control circuit. Based on the first control command, the control circuit disconnects the path of electricity flowing through the body terminal and gate of the second switching transistor, preventing electricity from flowing from the power output terminal to the power input terminal through the second switching transistor. When the charge pump is working, the detection logic circuit sends a second control command to the control circuit and the power supply circuit. Based on the second control command, the power supply circuit provides a first voltage to the control circuit. Based on the second control command and the first voltage, the control circuit alternately turns the second switching transistor on or off, enabling the charge pump to perform voltage conversion. Therefore, the charge pump driving circuit, the charge pump, and the fast charging system including the charge pump proposed in this application can operate normally, and when the charge pump is not working, it can reduce or even avoid power consumption of the electrical equipment connected to the power output terminal. By disconnecting the path from the power output terminal to the power input terminal, the main charging unit cannot generate static power consumption, thereby reducing the power loss of the fast charging system.

[0102] Based on the description of the above embodiments, the control circuit 212 does not include a power transistor, and the circuit of the control circuit 212 occupies a smaller volume. Compared with using a power transistor, using the control circuit 212 in the drive circuit 210 can effectively reduce the volume of the drive circuit 210, and effectively save the equipment cost and power cost of the fast charging system including the charge pump 20.

[0103] Below, in conjunction with Figure 4 The specific implementation structure of the control circuit 212, excluding the power transistor, is described in detail.

[0104] Please see Figure 4 , Figure 4 This is a schematic diagram of the control circuit in a charge pump drive circuit according to an embodiment of this application. Figure 4 As shown, the control circuit 212 may include a control-level switch group, an intermediate-level switch group, and a path-level switch group.

[0105] The control-level switch group is electrically connected to the power supply circuit 211, the detection logic circuit 213 and the intermediate-level switch group respectively. The intermediate-level switch group is also electrically connected to the second switch Q2. The path-level switch group is electrically connected to the second switch Q2.

[0106] When the first control command indicates that the charge pump 20 is not working, the control stage switch group is in the first state, the intermediate stage switch group is in the second state, and the path stage switch group is in the third state, so as to ground the third terminal of the second switch Q2 and the body terminal of the second switch Q2.

[0107] When the second control command indicates that the charge pump 20 is operating, the control stage switch group is in the fourth state, the intermediate stage switch group is in the fifth state, and the path stage switch group is in the sixth state to control the second switch Q2 to be turned on. When the control stage switch group is in the fourth state, the intermediate stage switch group is in the seventh state, and the path stage switch group is in the sixth state to control the second switch Q2 to be turned off.

[0108] The control stage switching transistor group includes: the eighth switch S1 and the ninth switch S3. The intermediate stage switching transistor group includes: the fifth switch P1, the sixth switch N1, and the seventh switch N2. The path stage switching transistor group includes: the tenth switch S4, the twelfth switch S2, and the eleventh switch S5.

[0109] The first terminal of the fifth switch P1 is electrically connected to the first terminal of the power supply circuit 211. The second terminal of the fifth switch P1 is electrically connected to the first terminal of the sixth switch N1. The second terminal of the sixth switch N1 is electrically connected to the first terminal of the seventh switch N2. The second terminal of the seventh switch N2 outputs the voltage VOUT. The first terminal of the eighth switch S1 is electrically connected between the second terminal of the power supply circuit 211 and the first terminal of the fifth switch P1. The second terminal of the eighth switch S1 is electrically connected to the first terminal of the ninth switch S3. The second terminal of the ninth switch S3 is grounded. The third terminals of the fifth switch P1 and the seventh switch are respectively electrically connected to the first terminal of the detection logic circuit 213. The third terminal of the sixth switch N1 is electrically connected to the second terminal of the eighth switch S1. The first connection point is electrically connected between the first terminal of the ninth switch transistor S3 and the third terminal of the second switch transistor Q2. The first connection point is located between the second terminal of the fifth switch transistor P1 and the first terminal of the sixth switch transistor N1. The first terminal of the tenth switch transistor S4 is electrically connected between the first connection point and the third terminal of the second switch transistor Q2. The second terminal of the tenth switch transistor S4 is grounded. The first terminal of the eleventh switch transistor S5 is electrically connected to the body terminal of the second switch transistor Q2. The second terminal of the eleventh switch transistor S5 is grounded. The first terminal of the twelfth switch transistor S2 is electrically connected between the body terminal of the second switch transistor Q2 and the first terminal of the eleventh switch transistor S5. The second terminal of the twelfth switch transistor S2 is electrically connected between the second terminal of the second switch transistor Q2 and the first terminal of the third switch transistor Q3.

[0110] Among them, the fifth switch P1, the sixth switch N1, the seventh switch N2, the eighth switch S1, the ninth switch S3, the tenth switch S4, the eleventh switch S5 and the twelfth switch S2 can all be field-effect transistors, thereby controlling the conduction and disconnection of different paths in the charge pump 20.

[0111] Figure 4In the diagram, the first connection point is denoted as X, the first terminal of the fifth switch P1 is denoted as 1, the second terminal of the fifth switch P1 is denoted as 2, and the third terminal of the fifth switch P1 is denoted as 3. Similarly, the first terminal of the sixth switch N1 is denoted as 1, the second terminal of the sixth switch N1 is denoted as 2, and the third terminal of the sixth switch N1 is denoted as 3. Additionally, Figure 4 The Q2 logic on / off shown is the switching control signal generated by the detection logic circuit 213.

[0112] When the charge pump 20 is working, the charging and discharging process of the first capacitor C1 is realized by the alternating conduction or disconnection of the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4. The amount of electricity input from the charge pump 20 at the power input terminal is output to the power output terminal, thus completing the charging of the electrical equipment connected to the power output terminal.

[0113] The specific implementation process of the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 being alternately turned on or off is as follows:

[0114] Assuming the first switch Q1 and the third switch Q3 are turned on, and the second switch Q2 and the fourth switch Q4 are turned off, then the first terminal of the first capacitor C1 is connected to the power input terminal. Thus, the first capacitor C1 begins to charge.

[0115] When the charging time of the first capacitor C1 exceeds a preset time, the first switch Q1 and the third switch Q3 are turned off, while the second switch Q2 and the fourth switch Q4 are turned on. Then, the first terminal of the first capacitor C1 is connected to the first terminal of the second switch Q2. Thus, the first capacitor C1 begins to discharge.

[0116] By repeating the above steps, the first capacitor C1 can be charged and discharged alternately, and the power can be output to the power output terminal.

[0117] Based on the above steps, when the charge pump 20 is working, it is necessary to turn the second switch Q2 on or off in a timely manner.

[0118] When charge pump 20 is operating, the fourth state indicates that the eighth switch S1 is on and the ninth switch S3 is off. The fifth state indicates that the fifth switch P1 is on, the sixth switch N1 is on, and the seventh switch N2 is on. The sixth state indicates that the tenth switch S4 is off, the twelfth switch S2 is on, and the eleventh switch S5 is off. Therefore, the second switch Q2 is on.

[0119] When charge pump 20 is operating, the fourth state indicates that the eighth switch S1 is on and the ninth switch S3 is off. The seventh state indicates that the fifth switch P1 is off, the sixth switch N1 is on, and the seventh switch N2 is on. The sixth state indicates that the tenth switch S4 is off, the twelfth switch S2 is on, and the eleventh switch S5 is off. Consequently, the second switch Q2 is off.

[0120] When the second switch Q2 needs to be turned on, the eighth switch S1 is turned on, the ninth switch S3 is turned off, the sixth switch N1 is turned on, the seventh switch N2 is turned on, the tenth switch S4 is turned off, the eleventh switch S5 is turned off, and the twelfth switch S2 is turned on, so that the body terminal of the second switch Q2 is connected to the output voltage VOUT. The detection logic circuit 213 controls the power supply circuit 211 to generate the first voltage Q2_VDD. Q2_VDD is supplied from the power supply circuit 211 through the turned-on fifth switch P1 to the gate of the second switch Q2, so that the second switch Q2 is turned on.

[0121] When the second switch Q2 needs to be turned off, the twelfth switch S2 is turned on, the ninth switch S3 is turned off, the tenth switch S4 is turned off, and the eleventh switch S5 is turned off. The detection logic circuit 213 controls the fifth switch P1 to turn off and the seventh switch N2 to turn on by generating the Q2 logic on / off signal. The eighth switch S1 turns on, which turns on the sixth switch N1, and the gate voltage of the second switch Q2 equals the output voltage VOUT, thereby turning off the second switch Q2.

[0122] When the charge pump 20 is not working, the disconnection of all paths of the second switch Q2 prevents the power output from flowing to the power input through the charge pump 20.

[0123] The first state indicates that the eighth switch S1 is off and the ninth switch S3 is on. The second state indicates that the fifth switch P1 is off, the sixth switch N1 is off, and the seventh switch N2 is off. The third state indicates that the tenth switch S4 is on, the twelfth switch S2 is off, and the eleventh switch S5 is on. Therefore, the entire path of the second switch Q2 is disconnected.

[0124] The specific process of disconnecting all paths of the second switch Q2 is as follows:

[0125] (1) The body terminal of the second switch Q2 is grounded. The twelfth switch S2 is off, and the eleventh switch S5 is on. Therefore, the body terminal of the second switch Q2 is grounded through the on-state eleventh switch S5. In this way, the power output cannot flow to the first switch Q1 through the body terminal of the second switch Q2, and consequently, the power output cannot flow to the power input through the first switch Q1.

[0126] (2) The gate of the second switch Q2 is grounded. The tenth switch S4 is turned on, and the gate of the second switch Q2 is grounded through the turned-on tenth switch S4. When the tenth switch S4 is turned on, the ninth switch S3 also needs to be turned on, so that the sixth switch N1 is grounded through the turned-on ninth switch S3. This prevents the output voltage VOUT from passing through the body diode of the seventh switch N2, through the channel of the sixth switch N1, and then through the turned-on tenth switch S4 to ground, resulting in power loss. At this time, the power at the power output terminal cannot flow into the power input terminal through the drain of the second switch Q2 and the body diode of the first switch Q1.

[0127] Based on the above embodiments, the driving circuit 210 of this application may further include: a current detection circuit 214. (Refer to...) Figure 5 , Figure 5 This is a schematic diagram of the connection of the current detection circuit in the drive circuit of a charge pump according to an embodiment of this application.

[0128] exist Figure 3 Based on the structure shown, as Figure 5 As shown, the conductive trace between the power supply voltage VBUS and the first terminal of the first switching transistor Q1 forms a first impedance R1. The first and second terminals of the current detection circuit 214 are electrically connected between the first impedance R1. The third terminal of the current detection circuit 214 is grounded, and the fourth terminal of the current detection circuit 214 is connected to the third voltage Vsense.

[0129] The first terminal of the current detection circuit 214 is denoted as 1, the second terminal of the current detection circuit 214 is denoted as 2, the third terminal of the current detection circuit 214 is denoted as 3, and the fourth terminal of the current detection circuit 214 is denoted as 4.

[0130] The current detection circuit 214 is used to detect the input current Iin obtained by the charge pump 20 from the power input terminal in real time. The information of the input current Iin may include the direction of the input current Iin, the waveform of the input current Iin, and the amplitude of the input current Iin.

[0131] Based on the above input current Iin information, the detection logic circuit 213 obtains the working status, power consumption and efficiency of the charge pump 20 in real time, providing reference information for the control, adjustment and fault diagnosis of the drive circuit 210.

[0132] The current detection circuit 214 outputs a third voltage Vsense based on the first impedance R1. Therefore, the drive circuit 210 obtains information about the input current Iin based on the third voltage Vsense. For example, the detection logic circuit 213 can also be electrically connected to the fourth terminal of the current detection circuit 214, so that the detection logic circuit 213 obtains information about the input current Iin based on the third voltage Vsense.

[0133] Reference Figure 6 , Figure 6 This is a schematic diagram of the current detection circuit in the drive circuit of a charge pump according to an embodiment of this application.

[0134] like Figure 6 As shown, the current detection circuit 214 may include: a first resistor R2, an operational amplifier A, a thirteenth transistor Q5, and a second resistor R3.

[0135] The first terminal of the first resistor R2 is electrically connected between the first terminal of the first impedance R1 and the power supply voltage VBUS. The second terminal of the first resistor R2 is electrically connected to the first terminal of the thirteenth transistor Q5. The first input terminal of the operational amplifier A is electrically connected between the second terminal of the first resistor R2 and the first terminal of the thirteenth transistor Q5. The second input terminal of the operational amplifier A is electrically connected between the second terminal of the first impedance R1 and the first terminal of the first switching transistor Q1. The second terminal of the thirteenth transistor Q5 is electrically connected to the first terminal of the second resistor R3. The second terminal of the second resistor R3 is grounded. The output terminal of the operational amplifier A is electrically connected to the third terminal of the thirteenth transistor Q5. The body terminal of the thirteenth transistor Q5 is electrically connected to the second terminal of the thirteenth transistor Q5. The third voltage Vsense is output from either the body terminal or the second terminal of the thirteenth transistor Q5.

[0136] Operational amplifier A is used to convert current to voltage, transforming the input current Iin signal into a measurable voltage signal and amplifying it. This enables accurate detection of the input current Iin.

[0137] The first impedance R1 is the impedance caused by the metal trace at the power input terminal within the current detection circuit 214. The input current Iin flows through the first impedance R1, and the first impedance R1 is relatively small here.

[0138] The first resistor R2 is the impedance caused by the metal trace within the current detection circuit 214. In some examples, the first resistor R2 can be a serpentine conductive trace within the chip through metal, achieving a larger resistance value. Therefore, using a serpentine conductive trace can reduce external interference, increase the resistance value of the first resistor R2, thereby reducing the value of the induced current Isense and improving the detection efficiency of the current detection circuit 214.

[0139] The thirteenth transistor, Q5, operates in the linear region and converts the output signal of amplifier A into a voltage signal. The thirteenth transistor Q5 can be an output stage field-effect transistor, or it can be a bipolar transistor.

[0140] The second resistor, R3, is used to convert the current. By adjusting the value of the second resistor R3, the measurement accuracy and sensitivity of the input current Iin can be adjusted. A smaller second resistor R3 can improve the system's sensitivity, allowing a smaller change in input current to produce a larger third voltage Vsense output or induced current Isense output. Conversely, a larger second resistor R3 can increase the measurement accuracy, making the output induced current Isense more stable and less susceptible to external interference.

[0141] Based on this, after amplifier A stabilizes, Vip = Vin, where Vin is the voltage at the first input terminal of operational amplifier A, and Vip is the voltage at the second input terminal of operational amplifier A. From the formula Vip = Vin, we can obtain Iin * R1 = Isense * R2. Here, Iin is the current flowing through R1, and Isense is the induced current. We can further obtain Isense = Iin * R1 / R2, therefore, Vsense = Iin * R3 * R1 / R2, and Vsense is the third voltage. The third voltage Vsense contains information about the input current Iin. Thus, the drive circuit 210 can obtain the information about the input current Iin based on the information of the third voltage Vsense, and complete the detection of the input current Iin.

[0142] In related technologies, charge pumps may also have a leakage path, which can cause the power output to flow to the power input through the detection logic circuit, resulting in leakage.

[0143] Based on this, the driving circuit 210 of this application can enable the power output terminal to flow to the detection logic circuit 213 to charge the second capacitor C2, thereby reusing the power output terminal and further reducing power loss.

[0144] Based on the above embodiments, the following, in conjunction with Figure 7 This paper describes in detail another function of the drive circuit 210 of this application.

[0145] Please see Figure 7 , Figure 7 This is a schematic diagram of another structure of a charge pump drive circuit according to an embodiment of this application.

[0146] exist Figure 3 Based on the structure shown, as Figure 7 As shown, the driving circuit 210 of this application also includes a second capacitor C2.

[0147] The second capacitor C2 is connected in parallel between the second connection point and the third terminal of the power supply circuit 211. The second connection point is located between the second terminal of the first switch Q1 and the first terminal of the second switch Q2. The third terminal of the detection logic circuit 213 is connected between the second terminal of the second switch Q2 and the first terminal of the third switch Q3.

[0148] Figure 7 In the diagram, the second connection point is denoted as Y. The third terminal of the power supply circuit 211 is denoted as 3, the third terminal of the detection logic circuit 213 is denoted as 3, and Boost is the pin connected to the second capacitor C2.

[0149] When the charge pump 20 is not working, a path is formed between the power output terminal, the detection logic circuit 213, the power supply circuit 211, and the second capacitor C2. The power at the power output terminal can charge the second capacitor C2 through this path, and the second capacitor C2 can also discharge to return the power to the power output terminal through this path, thereby realizing the reuse of the power at the power output terminal.

[0150] When the charge pump 20 is not working, the charge is transferred from the power supply output terminal through the detection logic circuit 213 and then through the power supply circuit 211 to the second capacitor C2, thereby charging the second capacitor C2. When the charge pump 20 is working, the second capacitor C2 discharges, allowing the charge to be transferred from the power supply circuit 211 and then through the detection logic circuit 213 to the power supply output terminal.

[0151] Figure 8 This is a schematic diagram of the detection logic circuit in the drive circuit of a charge pump according to an embodiment of this application. (Refer to...) Figure 8 The detection logic circuit 213 may include a fifteenth switch N3 and a sixteenth switch N4. The first terminal of the fifteenth switch N3 is electrically connected to the second terminal of the detection logic circuit 213, the second terminal of the fifteenth switch N3 is electrically connected to the first terminal of the sixteenth switch N4, and the second terminal of the sixteenth switch N4 is electrically connected to the third terminal of the detection logic circuit 213.

[0152] Figure 8 In the diagram, the first terminal of the fifteenth switch N3 is denoted as 1, the second terminal of the fifteenth switch N3 is denoted as 2, the first terminal of the sixteenth switch N4 is denoted as 1, and the second terminal of the sixteenth switch N3 is denoted as 4.

[0153] When the charge pump 20 is not working, the electrical charge flows through the path of the detection logic circuit 213 via the power output terminal, passing through the body terminals of the fifteenth switch N3 and the sixteenth switch N4. Through the second capacitor C2, when the charge pump 20 is not working, the electrical charge at the power output terminal flows to the power supply circuit 211 through the body terminals of the fifteenth switch N3 and the sixteenth switch N4, thereby charging the second capacitor C2 and reducing the power loss at the power output terminal.

[0154] When the charge pump 20 is working, the second capacitor C2 discharges, causing the charge to flow through the power supply circuit 211 to the detection logic circuit 213, and then through the fifteenth switch N3 and the sixteenth switch N4 in the logic detection unit 213 to the power output terminal.

[0155] Finally, it should be noted that the above embodiments are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A drive circuit of a charge pump, characterized by comprising: The method is applied to a charge pump, which includes: a first switching transistor, a second switching transistor, a third switching transistor, a fourth switching transistor, a first capacitor, and the driving circuit. The driving circuit includes: a control circuit, a power supply circuit, and a detection logic circuit. The first switch, the second switch, the third switch, and the fourth switch are connected in series between the power input terminal and ground. The first capacitor is connected in parallel between the first terminal of the second switch and the second terminal of the third switch. The third terminal of the second switch is connected to the first terminal of the control circuit. The body terminal of the second switch is connected to the second terminal of the control circuit. The third terminal of the control circuit is connected to the first terminal of the detection logic circuit. The fourth terminal of the control circuit is connected to the first terminal of the power supply circuit. The fifth terminal of the control circuit is connected between the second terminal of the second switch and the first terminal of the third switch. The second terminal of the detection logic circuit is connected to the second terminal of the power supply circuit. The detection logic circuit is used to send a first control command to the control circuit; The control circuit is used to ground the third terminal of the second switch and the body terminal of the second switch when the first control command indicates that the charge pump is not working, so as to disconnect the path for the output voltage to transmit the power supply voltage through the first switch and the second switch. The detection logic circuit is also used to send a second control command to the control circuit and the power supply circuit; The power supply circuit is used to provide a first voltage to the control circuit when the second control command indicates that the charge pump is to operate; The control circuit is further configured to control the second switch to alternately turn on or off when the second control command indicates that the charge pump is working; wherein, when the second switch is on, the third terminal of the second switch is electrically connected to the first voltage; and when the second switch is off, the third terminal of the second switch is electrically connected to the output voltage.

2. The driving circuit according to claim 1, characterized in that, The control circuit includes a control-level switch group, an intermediate-level switch group, and a path-level switch group; The control-level switch group is electrically connected to the power supply circuit, the detection logic circuit and the intermediate-level switch group respectively. The intermediate-level switch group is also electrically connected to the second switch. The path-level switch group is electrically connected to the second switch. When the first control command indicates that the charge pump is not working, the control stage switch group is in a first state, the intermediate stage switch group is in a second state, and the path stage switch group is in a third state, so as to ground the third terminal of the second switch and the body terminal of the second switch. When the second control command indicates that the charge pump is working, the control stage switch group is in the fourth state, the intermediate stage switch group is in the fifth state, and the path stage switch group is in the sixth state to control the second switch to be turned on; when the control stage switch group is in the fourth state, the intermediate stage switch group is in the seventh state, and the path stage switch group is in the sixth state, the second switch to be turned off.

3. The driving circuit according to claim 2, characterized in that, The control-level switch group includes: the eighth switch and the ninth switch; the intermediate-level switch group includes: the fifth switch, the sixth switch and the seventh switch; the path-level switch group includes: the tenth switch, the twelfth switch and the eleventh switch. The first terminal of the fifth switch is electrically connected to the first terminal of the power supply circuit. The second terminal of the fifth switch is electrically connected to the first terminal of the sixth switch. The second terminal of the sixth switch is electrically connected to the first terminal of the seventh switch. The second terminal of the seventh switch outputs the output voltage. The first terminal of the eighth switch is electrically connected between the first terminal of the power supply circuit and the first terminal of the fifth switch. The second terminal of the eighth switch is electrically connected to the first terminal of the ninth switch. The second terminal of the ninth switch is grounded. The third terminals of the fifth and seventh switches are respectively electrically connected to the first terminal of the detection logic circuit. The third terminal of the sixth switch is electrically connected to the second terminal of the eighth switch and the... Between the first ends of the ninth switch transistor, the first connection point is electrically connected to the third end of the second switch transistor. The first connection point is located between the second end of the fifth switch transistor and the first end of the sixth switch transistor. The first end of the tenth switch transistor is electrically connected between the first connection point and the third end of the second switch transistor. The second end of the tenth switch transistor is grounded. The first end of the eleventh switch transistor is electrically connected to the body terminal of the second switch transistor. The second end of the eleventh switch transistor is grounded. The first end of the twelfth switch transistor is electrically connected between the body terminal of the second switch transistor and the first end of the eleventh switch transistor. The second end of the twelfth switch transistor is electrically connected between the second end of the second switch transistor and the first end of the third switch transistor.

4. The driving circuit according to claim 1, characterized in that, The driving circuit further includes: a current detection circuit; The conductive trace between the power supply voltage and the first terminal of the first switching transistor forms a first impedance. The first and second terminals of the current detection circuit are electrically connected between the first impedance. The third terminal of the current detection circuit is grounded. The fourth terminal of the current detection circuit is connected to a third voltage. The current detection circuit is used to output the third voltage, which is used to indicate relevant information about the input current.

5. The driving circuit according to claim 4, characterized in that, The current detection circuit includes: a first resistor, an operational amplifier, a thirteenth transistor, and a second resistor; The first end of the first resistor is electrically connected between the first end of the first impedance and the power supply voltage. The second end of the first resistor is electrically connected to the first end of the thirteenth transistor. The first input terminal of the operational amplifier is electrically connected between the second end of the first resistor and the first end of the thirteenth transistor. The second input terminal of the operational amplifier is electrically connected between the second end of the first impedance and the first end of the first switching transistor. The second end of the thirteenth transistor is electrically connected to the first end of the second resistor. The second end of the second resistor is grounded. The output terminal of the operational amplifier is electrically connected to the third end of the thirteenth transistor. The body terminal of the thirteenth transistor is electrically connected to the second end of the thirteenth transistor. The third voltage is output from either the body terminal or the second end of the thirteenth transistor.

6. The driving circuit according to claim 5, characterized in that, The first resistor uses a serpentine conductive trace.

7. The driving circuit according to claim 1, characterized in that, The driving circuit also includes: a second capacitor; The second capacitor is connected in parallel between the second connection point and the third terminal of the power supply circuit. The second connection point is located between the second terminal of the first switching transistor and the first terminal of the second switching transistor. The third terminal of the detection logic circuit is connected between the second terminal of the second switching transistor and the first terminal of the third switching transistor. The detection logic circuit is also used to charge the second capacitor by the output voltage when the charge pump is not working; The detection logic circuit is also used to control the discharge of the second capacitor when the charge pump is working.

8. The driving circuit according to claim 7, characterized in that, The detection logic circuit includes: a fifteenth switch and a sixteenth switch; The first terminal of the fifteenth switch is electrically connected to the second terminal of the detection logic circuit, the second terminal of the fifteenth switch is electrically connected to the first terminal of the sixteenth switch, and the second terminal of the sixteenth switch is electrically connected to the third terminal of the detection logic circuit.

9. A charge pump, characterized in that, include: The first switching transistor, the second switching transistor, the third switching transistor, the fourth switching transistor, the first capacitor, and the driving circuit as described in any one of claims 1-8.

10. A chip, characterized in that, include: The driving circuit as described in any one of claims 1-8, or the charge pump as described in claim 9.

11. A fast charging system, characterized in that, include: The main charging unit and one or more charge pumps as described in claim 9; The first terminal of the main charging unit and the first terminal of the charge pump are both connected to the power supply voltage, the second terminal of the main charging unit is connected to the system voltage, and the third terminal of the main charging unit and the second terminal of the charge pump are both connected to the output voltage. The main charging unit is used to provide the system voltage and the output voltage.

12. The fast charging system according to claim 11, characterized in that, The fast charging system also includes: a protection unit; The protection unit is electrically connected between the third connection point and the output voltage, and the third terminal of the main charging unit and the second terminal of the charge pump are connected to the output voltage through the third connection point; The protection unit is used to monitor and control at least one of the following parameters when the main charging unit and / or the charge pump is operating: the output voltage, the output current at the output voltage terminal, and the temperature of the fast charging system.

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