Switching power supply circuit and charging equipment

Abstract

The utility model discloses a switching power supply circuit and charging equipment, and belongs to the technical field of charging equipment, and the switching power supply circuit comprises a switch module, a current detection module, a first filtering module and a grounding end; the grounding end is connected with the current detection module through the first filtering module; the current detection module comprises a second resistor, a third resistor, a fourth resistor and a fourteenth capacitor, one end of the second resistor and one end of the third resistor are connected with the two ends of the fourth resistor respectively, and the two ends of the fourteenth capacitor are connected with the other end of the second resistor and the other end of the third resistor respectively. The other end of the second resistor and the other end of the third resistor are connected with the switch module. According to the switching power supply circuit provided by the invention, the first filtering module is arranged between the current detection module and the grounding end, so that the integrity of a grounding loop is improved, and the grounding loop can effectively absorb electromagnetic radiation in direct-current voltage output by the switching power supply circuit; therefore, interference of electromagnetic radiation on wireless communication of surrounding electronic equipment is avoided.

Description

Technical Field

[0001] Embodiments of the present application relate to the technical field of charging devices, and particularly to a switching power supply circuit and a charging device. Background Art

[0002] In a switching power supply circuit of a charger, a switching element is usually used to convert electrical energy into a pulse form at a high frequency, and at the same time, rectification, filtering, and voltage regulation are performed through a transformer and other circuit elements, and finally a required stable DC voltage is provided to the output end of the charger. However, the DC voltage output by the current structure of the switching power supply circuit has serious electromagnetic radiation interference, which will interfere with the wireless communication of surrounding electronic devices, thereby affecting the normal operation of the electronic devices. Utility Model Content

[0003] Embodiments of the present application provide a switching power supply circuit, the purpose of which is to solve the technical problem that the DC voltage output by the switching power supply circuit in the prior art will cause electromagnetic radiation interference to the wireless communication of surrounding electronic devices. Another embodiment of the present application provides a charging device, the purpose of which is to solve the technical problem that the DC voltage output by the switching power supply circuit of the charging device in the prior art will cause electromagnetic radiation interference to the wireless communication of surrounding electronic devices.

[0004] To solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0005] In a first aspect, a switching power supply circuit is provided, including:

[0006] A switching module;

[0007] An output driving module, the output driving module is connected to the switching module;

[0008] A current detection module, the current detection module is connected to the switching module;

[0009] A first filtering module, the first filtering module is connected to the switching module and the current detection module;

[0010] A ground terminal, the current detection module is connected to the ground terminal through the first filtering module;

[0011] Wherein, the current detection module includes a second resistor, a third resistor, a fourth resistor, and a fourteenth capacitor. One end of the second resistor and one end of the third resistor are respectively connected to both ends of the fourth resistor. Both ends of the fourteenth capacitor are respectively connected to the other end of the second resistor and the other end of the third resistor. The other end of the second resistor and the other end of the third resistor are also connected to the switching module.

[0012] In a second aspect, a charging device is provided, which has a power connection terminal and a battery connection terminal. The charging device includes:

[0013] A control chip, which is connected between the power connection terminal and the battery connection terminal; a switching power supply circuit as described in any one of the first aspects,

[0014] The switching power supply circuit is connected to the control chip.

[0015] One of the above technical solutions has the following advantages or beneficial effects:

[0016] Compared with the prior art, a switching power supply circuit of the present application includes: a switching module; an output driving module, the output driving module is connected to the switching module; a current detection module, the current detection module is connected to the switching module; a first filtering module, the first filtering module is connected to the switching module and the current detection module; a grounding terminal, the current detection module is connected to the grounding terminal through the first filtering module; wherein, the current detection module includes a second resistor, a third resistor, a fourth resistor and a fourteenth capacitor, one end of the second resistor and one end of the third resistor are connected to both ends of the fourth resistor, both ends of the fourteenth capacitor are connected to the other ends of the second resistor and the third resistor, and the other ends of the second resistor and the third resistor are also connected to the switching module. The switching power supply circuit provided by the present application is provided with a first filtering module between the current detection module and the grounding terminal to improve the integrity of the grounding loop, so that the grounding loop can effectively absorb the electromagnetic radiation in the DC voltage output by the switching power supply circuit, thereby avoiding the interference of the electromagnetic radiation on the wireless communication of the surrounding electronic devices and enabling the normal operation of the electronic devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The technical solutions and other beneficial effects of the present application will become obvious by describing the specific embodiments of the present application in detail with reference to the accompanying drawings.

[0018] Figure 1 It is a schematic connection structure diagram of the switching power supply circuit provided by the embodiment of the present application;

[0019] Figure 2 It is a schematic circuit connection structure diagram of the switching module provided by the embodiment of the present application;

[0020] Figure 3 It is a schematic module structure diagram of the charging device provided by the embodiment of the present application.

[0021] The reference numerals are as follows:

[0022] 100 - Switch module, 110 - Switch circuit, 120 - Voltage stabilizing circuit, 130 - Driving circuit, 140 - Current detection circuit, 200 - Voltage feedback module, 300 - Output driving module, 400 - Current detection module, 500 - First filtering module, 600 - Second filtering module, 700 - Ground terminal. Detailed implementation manners

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0024] Related technicians of the present application have noticed that due to the performance of components themselves and the limitation of PCB layout space in high-power vehicle chargers, the EMC (Electromagnetic Compatibility) electromagnetic radiation is too large, and the device cannot be efficiently charged.

[0025] In some embodiments, the switching power supply of the internal circuit of the charger has 2 Mosfets built in, and 2 Mosfets are also provided in the peripheral circuit of the switching power supply. The 2 externally provided Mosfets will generate relatively large electromagnetic radiation inside the charger. At the same time, since the current detection of the internal circuit of the charger is low-side detection (that is, the current detection resistor is connected to the ground terminal), the integrity of the ground is affected, and thus the electromagnetic radiation cannot be effectively filtered out. In the embodiments of the present application, the 2 Mosfets in the peripheral circuit of the charger are built into the switching power supply of the internal circuit of the Mosfet, thereby reducing the electromagnetic radiation generated by the power supply, and at the same time separating the current detection resistor from the ground terminal, thereby ensuring the integrity of the ground and improving the absorption ability of electromagnetic radiation.

[0026] The following describes the specific implementation manners of the present application through embodiments:

[0027] As Figure 1 shown, the embodiment of the present application discloses a switching power supply circuit, including: a switching module 100; an output driving module 300, the output driving module 300 is connected to the switching module 100; a current detection module 400, the current detection module 400 is connected to the switching module 100; a first filtering module 500, the first filtering module 500 is connected to the switching module 100 and the current detection module 400; a ground terminal 700, the current detection module 400 is connected to the ground terminal 700 through the first filtering module 500; wherein, the current detection module 400 includes a second resistor R2, a third resistor R3, a fourth resistor R4 and a fourteenth capacitor C14, one end of the second resistor R2 and one end of the third resistor R3 are respectively connected to both ends of the fourth resistor R4, both ends of the fourteenth capacitor C14 are respectively connected to the other end of the second resistor R2 and the other end of the third resistor R3, and the other end of the second resistor R2 and the other end of the third resistor R3 are further connected to the switching module 100.

[0028] Specifically, in the embodiment of the present application, the fourth resistor R4 is configured as a current detection resistor, and the current flowing through the fourth resistor R4 is obtained by detecting the voltage across the fourth resistor R4 and combining the resistance value of the fourth resistor R4. It should be noted that the fourth resistor R4 is separated from the ground terminal 700 by the first filtering module 500, so that the ground terminal 700 can be protected from interference, making the ground potential of the ground terminal 700 of the switching power supply circuit have a certain integrity, thereby improving the absorption ability of the ground terminal 700 to electromagnetic radiation.

[0029] Specifically, in the embodiments of the present application, the switching power supply circuit is a common power supply circuit used to convert electrical energy into a pulsed form at a high frequency, and after rectification, filtering, and voltage regulation through circuit components such as transformers, it finally provides the required stable DC voltage to the output terminal of the charger. The switching module 100 has a switching control chip and an external circuit connected to the switching control chip. Among them, in the switching module, the main functions of the switching control chip include: monitoring the output voltage or current, and performing feedback control according to the set reference value to adjust the output power of the switching power supply circuit and stabilize the output voltage. And the control chip can monitor the output situation in real time, adjust the switching frequency, duty cycle, and output voltage as needed to keep the output within the target range and have stability. The control chip can control the switching frequency, that is, the frequency at which the switching element switches. By adjusting the switching frequency, efficient energy conversion can be achieved and the impact of electromagnetic interference can be reduced. The switching control can also output corresponding signals, such as clock signals, data signals, etc.; the external circuit includes a sixth resistor R6, an eleventh capacitor C11, a twelfth capacitor C12, and a thirteenth capacitor C13. One end of the sixth resistor R6 is connected to the working voltage pin VCC of the switching control chip, and the other end is connected to one end of the eleventh capacitor C11. The other end of the eleventh capacitor C11 is connected to the ground terminal 700; one end of the twelfth capacitor C12 is connected to the enable signal line, and the enable signal line is connected to the enable pin EN in the switching control chip. One end of the thirteenth capacitor C13 is connected to the 5V voltage line, and the 5V voltage line is connected to the voltage pin V5V in the switching control chip. The other ends of the thirteenth capacitor C13 and the twelfth capacitor C12 are commonly connected to the ground terminal 700.

[0030] In some embodiments of the present application, the switching control chip usually also has multiple protection functions, such as overload protection, overvoltage protection, overheat protection, and short-circuit protection, etc. When the working state of the switching power supply circuit exceeds the safe range, the switching control chip will take corresponding protection measures, such as reducing the output power, cutting off the output, etc., to avoid damage or accidents between the power supply and the load. At the same time, when the switching power supply circuit is started or shut down, the switching control chip can achieve soft start and shutdown control. The soft start control can prevent current surges and unstable situations in the power supply system during startup. And the shutdown control can smoothly cut off the output of the switching power supply and eliminate unnecessary voltages on the power supply and the load.

[0031] Specifically, in the embodiments of the present application, the output driving module 300 is responsible for converting the control signal generated by the switching control chip into a current or voltage signal suitable for output. Its main functions include: The output driving module converts the control signal into a current or voltage signal suitable for driving power switching devices. These power switching devices (usually Mosfet or IGBT, Insulated Gate Bipolar Transistor) are responsible for converting the electrical energy of the input power supply into high-frequency pulse signals, which are then provided to the transformer and the output filter circuit. At the same time, the output driving module 300 has the function of adjusting the output voltage or current. By controlling specific parameters of the driving signal, such as the duty cycle, the magnitude of the output voltage or current can be adjusted to adapt to different load conditions.

[0032] Specifically, in the embodiments of the present application, the main function of the current detection module 400 is to monitor and measure the current in the circuit. It usually has the following functions and roles: Real-time current monitoring: The current detection module 400 can monitor the current flow in the circuit in real time. By measuring the magnitude and waveform of the current, the load condition and the current change trend of the circuit can be understood. The current detection module 400 can be used to measure and record the current to achieve electric energy metering and monitoring. By obtaining the current data, information such as power, energy consumption and load condition can be calculated to achieve purposes such as power management, electric energy optimization and fault analysis. Since the current is an important parameter in the circuit, the current detection module 400 can be used for fault diagnosis. By analyzing the changes, waveforms and abnormal conditions of the current, it can help detect and diagnose faults, short circuits or other abnormal conditions in the circuit.

[0033] In some embodiments of the present application, the current detection module 400 also has a protection function and a feedback control function. The current detection module 400 can be used to implement overcurrent protection. By monitoring the magnitude of the current, when the current exceeds the set threshold, the current detection module will trigger protection measures, such as cutting off the output of the switching power supply or reducing the output power, to prevent damage to the power supply and the load. The current detection module 400 can be used to provide a feedback signal for controlling and adjusting the output current of the switching power supply. After the feedback signal is compared with the set value, it is used to adjust the output of the switching control chip to maintain the stability and accuracy of the output current.

[0034] Specifically, in the embodiments of the present application, the function of the first filtering module 500 is to process the high-frequency pulse signal in the output of the switching power supply circuit to obtain a relatively smooth and stable output voltage or current. Its main functions include: filtering out high-frequency noise at the switching frequency, smoothing the output waveform and improving the stability of the output voltage / current.

[0035] Such as Figure 1As shown, in the embodiment of the present application, the other end of the second resistor R2 is connected to the positive current detection terminal of the switch module 100, and the other end of the third resistor R3 is connected to the negative current detection terminal of the switch module 100. Specifically, by selecting the resistance values of the second resistor R2 and the third resistor R3, the accuracy and precision of the measurement data of the switch control chip can be improved. At the same time, connecting the second resistor R2 and the third resistor R3 to the positive detection terminal and the negative detection terminal of the switch control chip can also provide a certain degree of protection function. The resistor can act as a current limiting element to limit the current passing through the circuit and avoid damage to the control chip caused by excessive current.

[0036] As Figure 1 shown, in the embodiment of the present application, the switch module 100 includes a switch circuit 110, and the switch circuit 110 includes a first switch group and a second switch group; the first switch group includes a first transistor Q1 and a fourth transistor Q4, the controlled terminal of the first transistor Q1 is connected to the output terminal of the first driver, and the controlled terminal of the fourth transistor Q4 is connected to the output terminal of the fourth driver; the second switch group includes a second transistor Q2 and a third transistor Q3, the controlled terminal of the second transistor Q2 is connected to the output terminal of the second driver, and the controlled terminal of the third transistor Q3 is connected to the output terminal of the third driver; the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 are connected in series, and the input terminal of the first transistor Q1 is connected to the voltage input signal line, and the output terminal of the fourth transistor Q4 is configured as the output terminal of the switch module 100. Specifically, the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 all include metal oxide semiconductor field effect transistors. The current passing is controlled by controlling the gate voltage on the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4. According to the control signals provided by the first driver, the second driver, the third driver, and the fourth driver, the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 can be accurately turned on or off to achieve the switching function of the power supply. When the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 are turned on, the current can be transmitted to the load. When the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 are turned off, the current input is cut off to keep the output stable. The first driver, the second driver, the third driver, and the fourth driver are used to receive the control signals from the logic circuit and convert them into sufficient current or voltage to drive the gates of the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4, so as to achieve the separation between the input and output of the switched-mode power supply and ensure the normal operation of the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4.

[0037] In the embodiments of the present application, it is worth noting that the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 are all arranged in the internal circuit of the switching module 100. After the switching module 100 is encapsulated, the electromagnetic interference generated by the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 can be reduced, thereby reducing the electromagnetic interference in the switching power supply circuit and reducing the noise in the output current of the switching power supply circuit.

[0038] As Figure 1 shown, in the embodiments of the present application, the switching module 100 further includes a driving circuit 130. The driving circuit 130 includes a logic circuit, and the logic circuit is connected to the input ends of the first driver, the second driver, the third driver, and the fourth driver. The logic circuit is usually composed of digital circuits and is used to execute the control algorithm and logic function of the switching power supply. The logic circuit is connected to the first driver, the second driver, the third driver, and the fourth driver, and is used to receive input signals such as reference voltage, feedback signal, and error detection signal, process them according to the set algorithm and logic, and generate corresponding control signals to control the first driver, the second driver, the third driver, and the fourth driver. The role of the logic circuit is to determine the working state of the switching power supply according to the control strategy, such as turning on, turning off, adjusting the output voltage / current, etc.

[0039] As Figure 1 shown, in the embodiments of the present application, both the first driver and the fourth driver are high-side drivers: The high-side driver is used to control the high-side switching device in the switching power supply, such as a high-side MOSFET or IGBT. Its main functions are as follows: Provide sufficient voltage and current to control the switching process of the high-side switching device to ensure its normal on / off operation. Enable the high-side switching device to be isolated from the ground or the load, thereby realizing the separation between the input and output of the power supply. Through the level conversion circuit in the high-side driver, the low-level signal of the control chip is converted into a high-level signal to drive the high-side switching device. In the present application, both the first transistor Q1 and the fourth transistor Q4 are high-side switching devices.

[0040] As Figure 1As shown, in the embodiment of the present application, both the second driver and the third driver are low-side drivers: A low-side driver is used to control the low-side switching device in a switching power supply, such as a low-side MOSFET or IGBT. Its main functions are as follows: Provide sufficient voltage and current to control the switching process of the low-side switching device to ensure its normal on-off operation. Enable the low-side switching device to be isolated from the ground or the load, thereby achieving the separation between the input and output of the power supply. Through the level conversion circuit in the low-side driver, convert the low-level signal of the control chip into a low-level signal to drive the low-side switching device. In the present application, the second transistor Q2 and the third transistor Q3 are both low-side switching devices.

[0041] As Figure 1 As shown, in the embodiment of the present application, the drive circuit 130 further includes a linear buck compensator, an error amplifier, and a pulse width modulation comparator. The linear buck compensator is connected to the negative terminal of the error amplifier. The first positive terminal of the error amplifier is connected to the first voltage SS, and the second positive terminal of the error amplifier is connected to the second voltage Vref. Among them, a ninth resistor R9, a fifteenth capacitor C15, and a sixteenth capacitor C16 are also connected between the negative terminal and the output terminal of the error amplifier. The ninth resistor R9 and the fifteenth capacitor C15 are connected in series and then connected in parallel with the sixteenth capacitor C16. The output terminal of the error amplifier is respectively connected to the positive terminals of the logic circuit and the pulse width modulation comparator, and the negative terminal of the pulse width modulation comparator is connected to the detection current Isens.

[0042] As Figure 1 As shown, in the embodiment of the present application, two bootstrap circuits are also connected to the logic circuit. The bootstrap circuit includes a bootstrap amplifier. The input terminal of one of the two bootstrap circuits is connected to the operating voltage VCC and the BST1 pin of the switch control chip, and the output terminal is connected to the first driver through the first diode D1. The input terminal of the other bootstrap circuit is connected to the operating voltage VCC and the BST2 pin of the switch control chip, and the output terminal is connected to the fourth driver through the second diode D2. The BST pin is used to provide the power supply voltage required by the high-side driver, so that the bootstrap circuit can turn on the first driver and the fourth driver.

[0043] As Figure 2As shown, in the embodiment of the present application, the switch module 100 further includes a voltage stabilization circuit 120. The voltage stabilization circuit 120 is connected to the drive circuit 130. The voltage stabilization circuit 120 includes a digital-to-analog converter, a VCC voltage regulator, a 5V voltage regulator, and an eighth resistor. The digital-to-analog converter is connected to the VCC voltage regulator, and the digital-to-analog converter is further configured to provide a second voltage Vref. The VCC voltage regulator is connected to the VCC pin and the EN pin of the switch control chip. One end of the VCC voltage regulator connected to the EN pin is also connected to one end of the eighth resistor R8, and the other end of the eighth resistor R8 is connected to the ground terminal. The VCC voltage regulator is connected to the 5V voltage regulator. The 5V voltage regulator is respectively connected to the V5V pin and the VIN pin of the switch control chip, and the output terminal is configured as a voltage output terminal Vout.

[0044] The voltage stabilization circuit provided by the present application can adjust and filter the input voltage to stabilize the voltage at a specific level required by the switch control chip. It ensures that the switch control chip can obtain a stable voltage under different power supply fluctuations or load changes, thus guaranteeing its normal functions and performance. At the same time, there may be various noises in the externally input voltage, such as AC noise, ripple noise, etc. The voltage stabilization circuit usually has a filtering function, which can effectively suppress these noises and make the output voltage more stable and reliable. Moreover, the voltage stabilization circuit also has a voltage protection mechanism, which can monitor and control whether the output voltage is within a safe range. If the input voltage exceeds or is lower than a certain threshold, the voltage stabilization circuit will take appropriate measures, such as cutting off the output or adjusting the current, to protect the switch control chip from overvoltage or overcurrent damage. In some cases, the operating voltage of the switch control chip may need to be higher or lower than the voltage of the power supply. The voltage stabilization circuit can adjust the voltage of the input power supply to a level suitable for the chip to operate by means of step-down or step-up.

[0045] As Figure 2As shown, in the embodiment of the present application, the switch module 100 further includes a current detection circuit 140. The current detection circuit 140 includes a current detection amplifier which has a first current input terminal, a second current input terminal and a current output terminal. The first current input terminal is connected to the second resistor R2, the second current input terminal is connected to the third resistor R3, and the current output terminal is connected to the logic circuit. Specifically, the current detection 140 further includes a signal amplifier, an amplifier & buffer, a digital-to-analog converter and a constant current limiter; the two input terminals of the current detection amplifier are respectively connected to the second resistor R2 and the third resistor R3, and are respectively used to obtain the current in the circuit. After the current is amplified by the current detection amplifier, it is respectively sent to the negative input terminals of the linear buck compensator, the amplifier & buffer and the signal amplifier. The positive input terminal of the signal amplifier is connected to the digital-to-analog converter, the output terminal of the signal amplifier is connected to the constant current limiter, and the output terminal of the constant current limiter is connected to the logic circuit; there are also a tenth resistor R10, a seventeenth capacitor C17 and an eighteenth capacitor C18 connected between the negative input terminal and the output terminal of the signal amplifier. Among them, the tenth resistor R10 and the seventeenth capacitor C17 are connected in series and then in parallel with the eighteenth capacitor C18. In the present application, the current detection circuit is used to measure the current passing through the fourth resistor R4. By sensing and measuring the magnitude of the current, the switch control chip can understand the current situation in the system or circuit in real time. At the same time, the current detection circuit can also be used to monitor the power consumption situation in the circuit. By detecting the current, the switch control chip can calculate the actual power consumption and provide corresponding feedback or control mechanisms. And, in some embodiments, the switch control chip can also dynamically adjust the current according to the requirements of different application scenarios. The current detection circuit can be used to detect the actual current and compare it with a preset value, so as to realize the function of dynamic current adjustment.

[0046] As Figure 2As shown, in the embodiment of the present application, the switch control chip further includes an I2C register, which is used to configure and control various parameters and functions of the chip. The I2C register is also connected to the digital-to-analog converter in the voltage stabilizing circuit 120 and the digital-to-analog converter in the current detection circuit 140. I2C (Inter-Integrated Circuit) is a serial communication protocol, which is often used to connect between chips or between a chip and an external device for communication. By using the I2C register, various parameters of the switch control chip are configured and set. These parameters may include function settings of input and output pins, communication rate, filter settings, power consumption management, etc. By performing a write operation on the register, the behavior and performance of the chip can be changed. The I2C register can also be used to read the status information of the switch control chip. These status information may include input voltage, output voltage, current, temperature, etc. By performing a read operation on the register, information about the current state of the chip can be obtained and monitored and analyzed. And, if there are multiple switch control chips or other external devices connected, the I2C register can be used to implement communication between devices. By writing or reading data in the register, different chips or devices can communicate, interact, and synchronize operations to achieve consistent system control and coordination.

[0047] As Figure 1 shown, in the embodiment of the present application, the output driving module 300 includes a second capacitor C2, a third capacitor C3, and an inductor L3. One ends of the second capacitor C2 and the third capacitor C3 are both connected to the switch module 100, and the other ends of the second capacitor C2 and the third capacitor C3 are respectively connected to both ends of the inductor L3. Specifically, the function of the output driving module is to adjust the output voltage and current of the switching power supply circuit to the voltage and current suitable for the required load, and provide a stable and reliable power output. Specifically, the functions of the output driving module include output voltage regulation: the output driving module can adjust the output voltage of the switching power supply circuit to adapt to the required load voltage, and can achieve a stable output voltage and precisely control it; output current regulation: the output driving module can adjust the output current value of the switching power supply circuit to meet the requirements of the load. Through appropriate current limiting and protection mechanisms, the output driving module can ensure that the output current is within a safe range and prevent situations such as load overload or short circuit; output stability and reliability: the output driving module uses a filter circuit and voltage stabilizing technology to eliminate the ripple and noise in the output voltage and provide a stable and reliable power output to meet the stable operation requirements of the load circuit.

[0048] As Figure 1As shown, in the embodiment of the present application, the first filtering module 500 includes a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, and a tenth capacitor C10. The sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, the ninth capacitor C9, and the tenth capacitor C10 are connected in parallel. One end of the sixth capacitor C6 and one end of the seventh capacitor C7 are commonly connected to one end of the fourth resistor R4. One end of the eighth capacitor C8, one end of the ninth capacitor C9, and one end of the tenth capacitor C10 are commonly connected to the other end of the fourth resistor R4. The other end of the tenth capacitor C10 is connected to the ground terminal 700. Among them, one end of the sixth capacitor C6 is connected to the signal output terminal of the switching module 100. The end of the tenth capacitor C10 far from the ground terminal 700 is configured as the signal output terminal of the switching power supply circuit. Specifically, the switching power supply circuit converts the input voltage into a pulse signal through a high-frequency switch, and these high-frequency pulses will introduce noise and interference. The first filtering module 500 ensures the smoothness and stability of the output voltage or current by filtering out the high-frequency noise of the switching frequency and its multiples.

[0049] As Figure 1 shown, in the embodiment of the present application, the switching power supply circuit further includes a voltage feedback module 200. The voltage feedback module 200 includes a first resistor R1, a fifth resistor R5, and a seventh resistor R7. The first resistor R1 and the seventh resistor R7 are connected in series. One end of the fifth resistor R5 is connected between the first resistor R1 and the seventh resistor R7. The end of the first resistor R1 far from the seventh resistor R7 is connected to the ground terminal 700. Specifically, the other end of the fifth resistor R5 is connected to the FB terminal of the switching module 100, that is, Feedback, the feedback pin. The end of the seventh resistor R7 far from the fifth resistor R5 is configured as the FB input terminal. The end of the ninth capacitor C9 in the first filtering module 500 far from the ground terminal 700 is the FB output terminal. The FB input terminal is connected to the FB output terminal. Specifically, the switching control chip monitors and adjusts parameters such as the output voltage or current through the voltage feedback module 200. The voltage feedback module 200 can monitor and adjust the system response in real time to maintain the stability of the output and ensure that the system responds quickly and accurately under load changes or external disturbances.

[0050] As Figure 1As shown, in the embodiment of the present application, the switching power supply circuit further includes a second filtering module 600. The second filtering module 600 includes a first capacitor C1, a fourth capacitor C4, and a fifth capacitor C5. The first capacitor C1, the fourth capacitor C4, and the fifth capacitor C5 are connected in parallel. One end of the first capacitor C1 is connected to the signal input terminal of the switching module 100, and the other end of the first capacitor C1 is connected to the ground terminal 700. Among them, one end of the first capacitor C1 is configured as the input terminal of the switching power supply circuit. Specifically, the end of the first capacitor C1 far from the ground terminal 700 is the signal input terminal of the switching power supply circuit. The second filtering module 600 can eliminate high-frequency noise and interference in the input signal, protect the load device from electromagnetic interference, voltage fluctuations, and other interference sources, and reduce the impact on the load device.

[0051] As Figure 1 shown, the switch control chip further includes a data signal pin SCL, a clock signal pin SDA, an alarm pin ALERT, and a monitoring current pin IMON. The data signal pin SCL is configured to receive a data signal sent by an external device; the clock signal pin SDA is configured to send or receive a clock signal; the alarm pin ALERT is configured to send an alarm signal to an external device; the monitoring current pin IMON is configured to send a monitoring circuit signal to an external device.

[0052] As Figure 3 shown, the embodiment of the present application provides a charging device having a power connection end and a battery connection end. The charging device includes: a control chip connected between the power connection end and the battery connection end; and the switching power supply circuit provided in any one of the above embodiments; the switching power supply circuit is connected to the control chip. Specifically, the power connection end is connected to the power supply, the battery connection end is connected to the battery, and the power input from the power connection end is adjusted through the common control of the switching power supply circuit and the control chip, so as to charge the battery connected to the battery connection end.

[0053] The above has introduced in detail a switching power supply circuit and a charging device provided by the embodiments of the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A switching power supply circuit, characterized in that, Comprising: A switch module; An output driving module, the output driving module being connected to the switch module; A current detection module, the current detection module being connected to the switch module; A first filtering module, the first filtering module being connected to the switch module and the current detection module; A ground terminal, the current detection module being connected to the ground terminal through the first filtering module; Wherein, the current detection module includes a second resistor, a third resistor, a fourth resistor and a fourteenth capacitor, one end of the second resistor and one end of the third resistor are respectively connected to both ends of the fourth resistor, both ends of the fourteenth capacitor are respectively connected to the other end of the second resistor and the other end of the third resistor, and the other end of the second resistor and the other end of the third resistor are also connected to the switch module.

2. The switching power supply circuit according to claim 1, wherein The switch module has a positive current detection terminal and a negative current detection terminal, the other end of the second resistor is connected to the positive current detection terminal, and the other end of the third resistor is connected to the negative current detection terminal.

3. The switching power supply circuit according to claim 2, characterized in that, The switch module includes a switch circuit, and the switch circuit includes a first switch group and a second switch group; The first switch group includes a first transistor and a fourth transistor, the controlled end of the first transistor is connected to the output end of a first driver, and the controlled end of the fourth transistor is connected to the output end of a fourth driver; The second switch group includes a second transistor and a third transistor, the controlled end of the second transistor is connected to the output end of a second driver, and the controlled end of the third transistor is connected to the output end of a third driver; The first transistor, the second transistor, the third transistor and the fourth transistor are connected in series, and the input end of the first transistor is connected to a voltage input signal line, and the output end of the fourth transistor is configured as the output end of the switch module.

4. The switching power supply circuit according to claim 3, wherein, The switch module further includes a driving circuit, the driving circuit includes a logic circuit, and the logic circuit is connected to the input ends of the first driver, the second driver, the third driver and the fourth driver.

5. The switching power supply circuit according to claim 4, characterized in that, The switch module further includes a current detection circuit, the current detection circuit includes a current detection amplifier, the current detection amplifier has a first current input end, a second current input end and a current output end, the first current input end is connected to the second resistor, the second current input end is connected to the third resistor, and the current output end is connected to the logic circuit.

6. The switching power supply circuit according to claim 1, wherein, The output driving module includes a second capacitor, a third capacitor and an inductor, one end of the second capacitor and one end of the third capacitor are both connected to the switch module, and the other end of the second capacitor and the other end of the third capacitor are respectively connected to both ends of the inductor.

7. The switching power supply circuit according to claim 1, wherein, The first filtering module includes a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, and a tenth capacitor. The sixth capacitor, the seventh capacitor, the eighth capacitor, the ninth capacitor, and the tenth capacitor are connected in parallel. One end of the sixth capacitor and one end of the seventh capacitor are commonly connected to one end of the fourth resistor. One end of the eighth capacitor, one end of the ninth capacitor, and one end of the tenth capacitor are commonly connected to the other end of the fourth resistor. The other end of the tenth capacitor is connected to the ground terminal; wherein, one end of the sixth capacitor is connected to the signal output terminal of the switch module, and one end of the tenth capacitor is configured as the output terminal of the switching power supply circuit.

8. The switching power supply circuit according to claim 1, wherein, The switching power supply circuit further includes a voltage feedback module. The voltage feedback module includes a first resistor, a fifth resistor, and a seventh resistor. The first resistor and the seventh resistor are connected in series. One end of the fifth resistor is connected between the first resistor and the seventh resistor; the end of the first resistor far from the seventh resistor is connected to the ground terminal.

9. The switching power supply circuit according to claim 1, wherein The switching power supply circuit further includes a second filtering module. The second filtering module includes a first capacitor, a fourth capacitor, and a fifth capacitor. The first capacitor, the fourth capacitor, and the fifth capacitor are connected in parallel. One end of the first capacitor is connected to the signal input terminal of the switch module, and the other end of the first capacitor is connected to the ground terminal; wherein, one end of the first capacitor is configured as the input terminal of the switching power supply circuit.

10. A charging device, characterized in that, It has a power connection terminal and a battery connection terminal; the charging device includes: a control chip, and the control chip is connected between the power connection terminal and the battery connection terminal; The switching power supply circuit according to any one of claims 1-9, and the switching power supply circuit is connected to the control chip.

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