A DCDC power supply circuit and a control method, device and medium thereof

Abstract

This application relates to the field of electronic devices and discloses a DC-DC power supply circuit and its control method, device, and medium, including: a main control chip, a detection circuit, and an inductor; the detection circuit is connected to the load to obtain a first load signal; the input terminal of the main control chip is connected to the power supply to obtain a power signal; the main control chip obtains the first load signal and determines whether the first load signal is greater than a voltage threshold; if it is not greater than the voltage threshold, the power signal is pulse-width modulated (PWM) for a preset time within each power supply cycle to generate a modulated signal, and the generation of the modulated signal is stopped at other times within each power supply cycle. Therefore, the solution provided in this application reduces the number of switching operations of the MOS transistor inside the main control chip by controlling the chip to generate a modulated signal only within a preset time when the load voltage is less than or equal to the voltage threshold, thereby reducing switching losses and improving power utilization while ensuring normal load operation.

Description

Technical Field

[0001] This application relates to the field of electronic devices, and in particular to a DC-DC power supply circuit and its control method, device, and medium. Background Technology

[0002] In electronic circuits, switching power supplies are typically used to power multiple small electronic devices (e.g., the Wi-Fi communication module in a smart meter). To ensure that each device functions properly, a DC / DC power supply circuit is required for each device. This DC / DC power supply circuit is usually a pulse width modulation (PWM) circuit, which converts the high-voltage signal supplied by the power supply into a low-voltage signal by controlling the switching on and off of the MOSFETs inside the circuit chip, thereby powering the electronic devices.

[0003] When a PWM circuit powers a large load circuit, it can quickly raise the voltage to the required voltage. When powering a smaller load circuit, it typically outputs a lower voltage by reducing the pulse width duty cycle. However, by reducing the duty cycle, the turn-on and turn-off cycles of the MOSFET remain unchanged. The frequent turn-on and turn-off of the MOSFET cause excessive switching losses, resulting in wasted power.

[0004] Therefore, how to provide a DC-DC power supply circuit that can reduce the waste of electrical energy caused by switching losses is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this application is to provide a DC-DC power supply circuit and its control method, device, and medium to reduce switching losses when the PWM circuit supplies power to a small load circuit and improve power utilization.

[0006] To solve the above-mentioned technical problems, this application provides a DC-DC power supply circuit, including:

[0007] 1. Main control chip; 2. Detection circuit; 3. Inductor;

[0008] The first terminal of the detection circuit 2 is connected to the load to obtain a first load signal;

[0009] The input terminal of the main control chip 1 is connected to the power supply and is used to acquire power signals;

[0010] The feedback pin of the main control chip 1 is connected to the second end of the detection circuit 2 to obtain the first load signal and determine whether the first load signal is greater than the voltage threshold.

[0011] If the voltage is not greater than the voltage threshold, the power signal is pulse-width modulated to generate a modulated signal at a preset time in each power supply cycle, and the generation of the modulated signal is stopped at other times in each power supply cycle. The preset time is determined according to the type of the main control chip 1, the inductor 3 and the first load signal.

[0012] If the voltage exceeds the voltage threshold, the power signal is pulse-width modulated at each moment within each power supply cycle to generate the modulated signal.

[0013] The first end of the inductor 3 is connected to the output end of the main control chip 1, and the second end of the inductor 3 is connected to the load, which is used to convert the adjustment signal into a power supply signal to supply power to the load.

[0014] Preferably, the detection circuit 2 includes:

[0015] First resistor, second resistor, third resistor, first capacitor;

[0016] The first terminal of the first resistor, the first terminal of the first capacitor, the second terminal of the inductor 3, and the load are all connected together.

[0017] The second end of the first capacitor is connected to the first end of the second resistor, and the second end of the second resistor, the second end of the first resistor, and the first end of the third resistor are all connected to the feedback pin.

[0018] The second terminal of the third resistor is grounded.

[0019] Preferably, the DC-DC power supply circuit further includes: an energy storage circuit 4, used to supply power to the load in the event of a power failure;

[0020] The energy storage circuit 4 includes: a fourth resistor, a second capacitor, a first diode, a second diode, and a third diode;

[0021] The first end of the fourth resistor is connected to the second end of the inductor 3, and the second end of the fourth resistor is connected to the anode of the second diode.

[0022] The anode of the first diode is connected to the second terminal of the inductor 3, and the cathode of the first diode is connected to the load;

[0023] The first terminal of the second capacitor is connected to both the cathode of the second diode and the anode of the third diode, and the second terminal of the second capacitor is grounded.

[0024] The cathode of the third diode is connected to the load.

[0025] Preferably, the first resistor, the second resistor, the third resistor, and the first capacitor are all variable devices.

[0026] To address the aforementioned technical problems, this application also provides a DC-DC power supply circuit control method, applied to the DC-DC power supply circuit according to any one of claims 1 to 4, the method comprising:

[0027] Acquire the power signal and the first load signal;

[0028] Determine whether the first load signal is greater than the voltage threshold;

[0029] If the voltage is not greater than the voltage threshold, the power signal is pulse-width modulated to generate a modulated signal within a preset time period in each power supply cycle, and the generation of the modulated signal is stopped at other times in each power supply cycle. The preset time is determined according to the type of main control chip 1, the inductor 3 and the first load signal.

[0030] If the voltage exceeds the voltage threshold, the power signal is pulse-width modulated at each moment within each power supply cycle to generate the modulated signal.

[0031] Preferably, the DC-DC power supply circuit control method further includes:

[0032] At the end of each power supply cycle, a second load signal is acquired;

[0033] Determine whether the second load signal is greater than the voltage threshold;

[0034] If the voltage is not greater than the voltage threshold, the power signal is pulse-width modulated within the preset time period of the power supply cycle to generate the modulated signal, and the generation of the modulated signal is stopped at other times of the power supply cycle.

[0035] If the voltage exceeds the voltage threshold, the power signal is pulse-width modulated at each moment within each power supply cycle to generate the modulated signal.

[0036] Preferably, the DC-DC power supply circuit control method further includes:

[0037] When a power failure is detected, an alarm message is sent to the administrator.

[0038] To address the aforementioned technical problems, this application also provides a DC-DC power supply circuit control device, comprising:

[0039] The acquisition module is used to acquire the power signal and the first load signal;

[0040] The judgment module is used to determine whether the first load signal is greater than the voltage threshold.

[0041] The first generation module is configured to perform pulse width modulation on the power signal to generate a modulated signal within a preset time period in each power supply cycle if the voltage is not greater than the voltage threshold, and to stop generating the modulated signal at other times in each power supply cycle, wherein the preset time is a time determined according to the type of main control chip 1, inductor 3 and the first load signal.

[0042] The second generation module is used to perform pulse width modulation on the power supply signal at each moment in each of the power supply cycles to generate the modulated signal if the voltage is greater than the voltage threshold.

[0043] To solve the above-mentioned technical problems, this application also provides a DC-DC power supply circuit control device, including a memory for storing computer programs;

[0044] A processor is used to implement the steps of the DC-DC power supply circuit control method when executing the computer program.

[0045] To address the aforementioned technical problems, this application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the DCDC power supply circuit control method.

[0046] This application provides a DC-DC power supply circuit, which includes: a main control chip, a detection circuit, and an inductor; a first terminal of the detection circuit is connected to a load to obtain a first load signal; an input terminal of the main control chip is connected to a power supply to obtain a power signal; a feedback pin of the main control chip is connected to a second terminal of the detection circuit to obtain the first load signal and determine whether the first load signal is greater than a voltage threshold; if it is not greater than the voltage threshold, the power signal is pulse-width modulated at a preset time in each power supply cycle to generate a modulated signal, and the generation of the modulated signal is stopped at other times in each power supply cycle, wherein the preset time is the minimum time that the load can work normally, determined according to the type of the main control chip, the inductor, and the first load signal; if it is greater than the voltage threshold, the power signal is pulse-width modulated at each time in each power supply cycle to generate a modulated signal; a first terminal of the inductor is connected to the output terminal of the main control chip, and a second terminal of the inductor is connected to the load, for converting the adjustment signal into a power supply signal to supply power to the load. Therefore, the DC-DC power supply circuit provided in this application determines a preset time based on the main control chip type, inductor, and first load signal when the load voltage is less than or equal to the voltage threshold, and controls the chip to generate a modulation signal only within the preset time. This reduces the number of switching cycles of the MOS transistor inside the main control chip while ensuring the normal operation of the load, thereby reducing switching losses and improving power utilization.

[0047] In addition, this application also provides a DC-DC power supply circuit control method, device, and medium, which correspond to the above-mentioned DC-DC power supply circuit and have the same effect. Attached Figure Description

[0048] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 This is a structural diagram of a DC-DC power supply circuit provided in an embodiment of this application;

[0050] Figure 2 This is a structural diagram of another DC-DC power supply circuit provided in an embodiment of this application;

[0051] Figure 3 This is a structural diagram of an energy storage circuit provided in this application;

[0052] Figure 4 A flowchart illustrating a DC-DC power supply circuit control method provided in an embodiment of this application;

[0053] Figure 5 This is a structural diagram of a DC-DC power supply circuit control device provided in an embodiment of this application;

[0054] Figure 6 This is a structural diagram of another DC-DC power supply circuit control device provided in an embodiment of this application;

[0055] The attached diagram is labeled as follows: 1 is the main control chip, 2 is the detection circuit, 3 is the inductor, 4 is the energy storage circuit, 10 is the acquisition module, 11 is the judgment module, 111 is the first generation module, 112 is the second generation module, 20 is the memory, 21 is the processor, 201 is the computer program, 202 is the operating system, 203 is the data, 22 is the display screen, 23 is the input / output interface, 24 is the communication interface, 25 is the power supply, and 26 is the communication bus. Detailed Implementation

[0056] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0057] The core of this application is to provide a DC-DC power supply circuit and its control method, device, and medium to reduce switching losses when the PWM circuit supplies power to a small load circuit and improve power utilization.

[0058] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0059] Figure 1 A structural diagram of a DC-DC power supply circuit provided in an embodiment of this application is shown below. Figure 1 As shown, the circuit includes: a main control chip 1, a detection circuit 2, and an inductor 3;

[0060] The first terminal of the detection circuit 2 is connected to the load to obtain the first load signal;

[0061] The input terminal of the main control chip 1 is connected to the power supply to obtain the power signal;

[0062] The feedback pin of the main control chip 1 is connected to the second end of the detection circuit 2 to obtain the first load signal and determine whether the first load signal is greater than the voltage threshold.

[0063] If the voltage is not greater than the voltage threshold, the power signal is pulse-width modulated to generate a modulated signal at a preset time in each power supply cycle, and the generation of the modulated signal is stopped at other times in each power supply cycle. The preset time is the minimum time that the load can work normally, determined according to the type of main control chip 1 and the first load signal.

[0064] If the voltage exceeds the threshold, the power signal is pulse-width modulated at each moment in each power supply cycle to generate a modulated signal.

[0065] The first end of inductor 3 is connected to the output end of main control chip 1, and the second end of inductor 3 is connected to the load to convert the adjustment signal into a power supply signal to supply power to the load.

[0066] This solution provides a DC-DC power supply circuit capable of supplying power to different loads. The load signal is acquired through detection circuit 2. When the circuit load is large (i.e., the load signal is greater than the voltage threshold), it indicates that the power supply circuit needs to continuously output a high duty cycle PWM signal to pull the output signal high, ensuring the output voltage value meets the load's normal operating requirements. When the circuit load is small (i.e., the load signal is not greater than the voltage threshold), the DC-DC power supply circuit outputs a low duty cycle PWM signal. However, the main control chip 1 controls the pulse width modulation of the voltage signal by switching the internal MOSFETs on and off, resulting in the PWM signal period remaining unchanged. To reduce switching losses caused by MOSFET switching, the main control chip 1 performs pulse width modulation on the power signal only for a preset time within each power supply cycle, stopping signal modulation and outputting electrical signals at other times within each power supply cycle. This reduces the switching frequency of the MOSFETs within the main control chip 1, lowering switching losses.

[0067] The preset time is a value determined based on the model of the main control chip 1, the ratio of the power supply signal voltage to the supply voltage, and the duty cycle of the pulse width modulation signal. In specific implementations, the preset time can be calculated or obtained by looking up a table; no limitation is made here. For example, when using an ETA1477 DC-DC converter chip to convert a 12V input voltage to a 5.3V output voltage, the converter chip's operating cycle is 14ms, and the preset time is 7ms. In this embodiment, when the main control chip 1 detects that the load signal is below the threshold, it starts the preset time (7ms), then stops the modulation operation and stops outputting the current signal to the inductor 3.

[0068] In practical implementation, it is necessary to obtain the load signal through detection circuit 2 to determine the actual operating voltage of the load, and then determine the corresponding operating state according to the current operating voltage of the load, so that it can be applied to the power supply circuit of loads with different power consumption.

[0069] It is understood that the DC-DC power supply circuit provided in this application is typically used to power small electrical appliances such as smart meters. When the power supply fails, the smart appliances such as the meter cannot work properly, which may lead to serious losses. In order to improve system stability, the DC-DC power supply circuit should also include an energy storage circuit 4 with an energy storage capacitor. When the power supply fails, the energy stored in the energy storage capacitor is released to power the load.

[0070] This embodiment provides a DC-DC power supply circuit, which includes: a main control chip, a detection circuit, and an inductor; the first end of the detection circuit is connected to the load to obtain a first load signal; the input end of the main control chip is connected to the power supply to obtain a power signal; the feedback pin of the main control chip is connected to the second end of the detection circuit to obtain the first load signal and determine whether the first load signal is greater than a voltage threshold; if it is not greater than the voltage threshold, the power signal is pulse-width modulated at a preset time in each power supply cycle to generate a modulated signal, and the generation of the modulated signal is stopped at other times in each power supply cycle, wherein the preset time is the minimum time that the load can work normally, determined according to the type of the main control chip, the inductor, and the first load signal; if it is greater than the voltage threshold, the power signal is pulse-width modulated at each time in each power supply cycle to generate a modulated signal; the first end of the inductor is connected to the output end of the main control chip, and the second end of the inductor is connected to the load, for converting the adjustment signal into a power supply signal to supply power to the load. Therefore, the DC-DC power supply circuit provided in this application determines a preset time based on the main control chip type, inductor, and first load signal when the load voltage is less than or equal to the voltage threshold, and controls the chip to generate a modulation signal only within the preset time. This reduces the number of switching cycles of the MOS transistor inside the main control chip while ensuring the normal operation of the load, thereby reducing switching losses and improving power utilization.

[0071] Figure 2 A structural diagram of another DC-DC power supply circuit provided in the embodiments of this application is shown below. Figure 2 As shown, the detection circuit 2 includes: a first resistor R1, a second resistor R2, a third resistor R3, and a first capacitor C1;

[0072] The first terminal of the first resistor R1, the first terminal of the first capacitor C1, the second terminal of the inductor 3, and the load are all connected together.

[0073] The second terminal of the first capacitor C1 is connected to the first terminal of the second resistor R2. The second terminal of the second resistor R2, the second terminal of the first resistor R1, and the first terminal of the third resistor R3 are all connected to the feedback pin. The second terminal of the third resistor R3 is grounded.

[0074] In practical implementation, the first end of the third resistor R3 is connected to the feedback pin. The voltage at the feedback pin is the voltage across the third resistor R3. The load signal can be obtained based on the ratio of the resistance values ​​of the first resistor R1, the second resistor R2, and the third resistor R3, and the voltage at the feedback pin. The load signal Vout = a*(1+R1 / R3), where a is a constant whose value depends only on the model of the main control chip 1, R1 is the resistance value of the first resistor R1, and R3 is the resistance value of the third resistor R3. In this embodiment, the ETA1477 chip is selected as the main control chip 1, and the constant a is 0.768.

[0075] Understandably, to protect the power supply and load, filtering circuits are needed between the power supply and the main control chip 1, and between inductor 3 and the load, such as... Figure 2 As shown. To reduce the cost of the filter circuit, multiple small capacitors are connected in parallel to form the filter circuit.

[0076] To broaden the application range of DC-DC circuits and enable their use in filter circuits with varying power consumption loads, variable components are selected as the first resistor R1, the second resistor R2, the third resistor R3, and the first capacitor C1.

[0077] In this embodiment, by using variable resistors and variable capacitors to form the detection circuit, the DC-DC conversion circuit can select different operating modes according to different load signals to ensure that the load works normally.

[0078] In practice, DC-DC power supply circuits are commonly used to power small electrical appliances such as smart meters. If a power failure occurs during the power supply process, causing the load to malfunction, it may lead to load failure or damage, and even economic losses.

[0079] To address this issue, based on the above embodiments, the DC-DC power supply circuit further includes: an energy storage circuit 4, used to supply power to the load in the event of a power failure;

[0080] The energy storage circuit 4 includes: a fourth resistor R4, a second capacitor C2, a first diode D1, a second diode D2, and a third diode D3;

[0081] The first end of the fourth resistor R4 is connected to the second end of the inductor 3, and the second end of the fourth resistor R4 is connected to the anode of the second diode D2.

[0082] The anode of the first diode D1 is connected to the second terminal of the inductor 3, and the cathode of the first diode D1 is connected to the load.

[0083] The first terminal of the second capacitor C2 is connected to the cathode of the second diode D2 and the anode of the third diode D3, and the second terminal of the second capacitor C2 is grounded.

[0084] The cathode of the third diode D3 is connected to the load.

[0085] When the power supply is working normally, inductor 3 charges the second capacitor C2 through the fourth resistor R4 and the second diode D2. Since the anode voltage of the third diode D3 is lower than the cathode voltage of the third diode D3, the third diode D3 is in the off state. At this time, the DC-DC conversion circuit supplies power to the load through the path of the first diode D1. When the power supply fails, the anode voltage of the third diode D3 is higher than the cathode voltage of the third diode D3, and the anode voltage of the first diode D1 is lower than the cathode voltage of the first diode D1. The third diode D3 is turned on, and the first diode D1 is turned off. At this time, the second capacitor C2 supplies power to the load through the path of the second diode D2.

[0086] Figure 3 This is a structural diagram of an energy storage circuit provided in this application, as shown below. Figure 3 As shown, the first terminal of the energy storage circuit 4 is connected to the second terminal of the inductor 3, and the second terminal of the energy storage circuit 4 is connected to the load to power the WIFI communication module of the smart meter. It can be understood that this WIFI communication module includes an SGM2205-ADJXTDB8G / TR chip and a corresponding chip power supply circuit.

[0087] In addition, the DC-DC conversion circuit provided in this embodiment also includes a bootstrap circuit, etc., which will not be described in detail here.

[0088] Figure 4 This application provides a DC-DC power supply circuit control method, which is applied to the DC-DC power supply circuit described in the above embodiments. Figure 4 As shown, the method includes

[0089] S10: Obtain the power signal and the first load signal;

[0090] S11: Determine whether the first load signal is greater than the voltage threshold;

[0091] S111: If the voltage threshold is not greater than the voltage threshold, the power signal is pulse-width modulated to generate a modulated signal within a preset time in each power supply cycle, and the generation of the modulated signal is stopped at other times in each power supply cycle. The preset time is the minimum time that the load can work normally, determined according to the type of the main control chip 1 and the first load signal.

[0092] S112: If the voltage is greater than the voltage threshold, the power supply signal is pulse-width modulated at each moment in each power supply cycle to generate a modulated signal.

[0093] This application provides a DC-DC power supply circuit control method, applied to the aforementioned DC-DC power supply circuit including a main control chip 1, an inductor 3, and a detection circuit 2. This method selects different operating states based on the actual operating voltage of the load connected to the power supply circuit. The main control chip 1 controls the switching of its internal MOSFETs. When the first load signal is not greater than a preset voltage threshold, the main control chip 1 generates a modulation signal only within a preset time period during the power supply cycle, thereby reducing the number of switching operations of the internal MOSFETs and minimizing switching losses. It is understood that the preset time is the minimum time required for the load to operate normally, determined based on the type of the main control chip 1 and the first load signal. The preset time can be a calculated value or a value obtained by looking up a table based on the chip type; no limitation is made here. The preset time also changes when the voltage required by the load changes.

[0094] The main control chip 1 achieves voltage conversion through pulse width modulation technology, and its power supply cycle is only related to the type of chip.

[0095] It is important to note that during the operation of the power supply circuit, load changes may occur. When the voltage demanded by the load increases, if the DC-DC circuit cannot respond quickly enough to raise the output voltage, it will affect the normal operation of the circuit. To solve this problem, DC-DC power supply circuit control methods also include:

[0096] At the end of each power supply cycle, acquire the second load signal;

[0097] Determine whether the second load signal is greater than the voltage threshold;

[0098] If the voltage is not greater than the voltage threshold, the power signal is pulse-width modulated to generate a modulated signal within a preset time during the power supply cycle, and the generation of the modulated signal is stopped at other times during the power supply cycle.

[0099] If the voltage exceeds the threshold, the power signal is pulse-width modulated at each moment within each power supply cycle to generate a modulated signal.

[0100] At the beginning of each power supply cycle, it is determined whether the current load signal is greater than the voltage threshold. If it is greater than the voltage threshold, a pulse width modulation signal is continuously output to quickly raise the output voltage to ensure that the load works normally.

[0101] This application provides a DC-DC power supply circuit, which includes: a main control chip, a detection circuit, and an inductor; a first terminal of the detection circuit is connected to a load to obtain a first load signal; an input terminal of the main control chip is connected to a power supply to obtain a power signal; a feedback pin of the main control chip is connected to a second terminal of the detection circuit to obtain the first load signal and determine whether the first load signal is greater than a voltage threshold; if it is not greater than the voltage threshold, the power signal is pulse-width modulated at a preset time in each power supply cycle to generate a modulated signal, and the generation of the modulated signal is stopped at other times in each power supply cycle, wherein the preset time is the minimum time that the load can work normally, determined according to the type of the main control chip, the inductor, and the first load signal; if it is greater than the voltage threshold, the power signal is pulse-width modulated at each time in each power supply cycle to generate a modulated signal; a first terminal of the inductor is connected to the output terminal of the main control chip, and a second terminal of the inductor is connected to the load, for converting the adjustment signal into a power supply signal to supply power to the load. Therefore, the DC-DC power supply circuit provided in this application determines a preset time based on the main control chip type, inductor, and first load signal when the load voltage is less than or equal to the voltage threshold, and controls the chip to generate a modulation signal only within the preset time. This reduces the number of switching cycles of the MOS transistor inside the main control chip while ensuring the normal operation of the load, thereby reducing switching losses and improving power utilization.

[0102] To ensure the normal operation of the load connected to the power supply circuit, when the power supply fails, the energy storage circuit 4 supplies power to the load. However, since the power supply capacity of the energy storage circuit 4 is relatively weak, timely maintenance by management personnel is still required to restore the power supply. Based on the above embodiment, the DC-DC power supply circuit control method further includes:

[0103] When a power failure is detected, an alarm message is sent to the administrator.

[0104] Specifically, alarm information can be sent to management personnel via WIFI or Bluetooth modules, or an alarm can be triggered by controlling a buzzer or indicator light connected to the energy storage circuit 4. It is understood that the buzzer and indicator light are connected to the cathode of the third diode D3; when the second capacitor C2 supplies power to the load through the circuit containing the third diode D3, the buzzer and indicator light will operate.

[0105] The DC-DC power supply circuit control method has been described in detail in the above embodiments. This application also provides embodiments corresponding to the DC-DC power supply circuit control device. It should be noted that this application describes the embodiments of the device part from two perspectives: one is based on the functional module, and the other is based on the hardware.

[0106] Figure 5A structural diagram of a DC-DC power supply circuit control device provided in this application embodiment is shown below. Figure 5 As shown, the device includes:

[0107] Acquisition module 10 is used to acquire power signal and first load signal;

[0108] The judgment module 11 is used to determine whether the first load signal is greater than the voltage threshold.

[0109] The first generation module 111 is used to perform pulse width modulation on the power supply signal to generate a modulated signal within a preset time in each power supply cycle if the voltage threshold is not greater than the voltage threshold, and to stop generating the modulated signal at other times in each power supply cycle. The preset time is the minimum time that the load can work normally, determined according to the type of the main control chip 1 and the first load signal.

[0110] The second generation module 112 is used to perform pulse width modulation on the power supply signal at each moment in each power supply cycle to generate a modulated signal if the voltage is greater than the voltage threshold.

[0111] Since the embodiments of the apparatus and the embodiments of the method correspond to each other, please refer to the description of the embodiments of the method for the embodiments of the apparatus, which will not be repeated here.

[0112] This embodiment provides a DC-DC power supply circuit control method. The circuit includes: a main control chip, a detection circuit, and an inductor. The first end of the detection circuit is connected to the load to obtain a first load signal. The input end of the main control chip is connected to the power supply to obtain a power signal. The feedback pin of the main control chip is connected to the second end of the detection circuit to obtain the first load signal and determine whether the first load signal is greater than a voltage threshold. If it is not greater than the voltage threshold, the power signal is pulse-width modulated at a preset time in each power supply cycle to generate a modulated signal. At other times in each power supply cycle, the generation of the modulated signal is stopped. The preset time is the minimum time that allows the load to work normally, determined according to the type of the main control chip, the inductor, and the first load signal. If it is greater than the voltage threshold, the power signal is pulse-width modulated at each time in each power supply cycle to generate a modulated signal. The first end of the inductor is connected to the output end of the main control chip, and the second end of the inductor is connected to the load to convert the adjustment signal into a power supply signal to supply power to the load. Therefore, the DC-DC power supply circuit control method provided in this application determines a preset time based on the main control chip type, inductor, and first load signal when the load voltage is less than or equal to a voltage threshold, and controls the chip to generate a modulation signal only within the preset time. This reduces the number of switching cycles of the MOS transistor inside the main control chip while ensuring normal load operation, thereby reducing switching losses and improving power utilization.

[0113] Figure 6A structural diagram of another DC-DC power supply circuit control device provided in the embodiments of this application is shown below. Figure 6 As shown, the DC-DC power supply circuit control device includes: a memory 20 for storing computer programs;

[0114] The processor 21 is configured to execute a computer program to implement the steps of the method for acquiring a first load signal as described in the above embodiments.

[0115] The processor 21 may include one or more processing cores, such as a quad-core processor or an octa-core processor. The processor 21 may be implemented using at least one of the following hardware forms: Digital Signal Processor (DSP), Field-Programmable Gate Array (FPGA), or Programmable Logic Array (PLA). The processor 21 may also include a main processor and a coprocessor. The main processor, also known as the Central Processing Unit (CPU), is used to process data in the wake-up state; the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, the processor 21 may integrate a Graphics Processing Unit (GPU), which is responsible for rendering and drawing the content to be displayed on the screen. In some embodiments, the processor 21 may also include an Artificial Intelligence (AI) processor, which is used to handle computational operations related to machine learning.

[0116] The memory 20 may include one or more computer-readable storage media, which may be non-transitory. The memory 20 may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices or flash memory devices. In this embodiment, the memory 20 is used to store at least the following computer program 201, which, after being loaded and executed by the processor 21, is capable of implementing the relevant steps of the DC-DC power supply circuit control method disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 20 may also include an operating system 202 and data 203, and the storage method may be temporary or permanent storage. The operating system 202 may include Windows, Unix, Linux, etc. The data 203 may include, but is not limited to, a first load signal, a preset time, etc.

[0117] In some embodiments, the DC-DC power supply circuit control device may further include a display screen 22, an input / output interface 23, a communication interface 24, a power supply 25, and a communication bus 26.

[0118] Those skilled in the art will understand that Figure 6 The structure shown does not constitute a limitation on the control device for the DC-DC power supply circuit, and may include more or fewer components than shown.

[0119] The DC-DC power supply circuit control device provided in this application includes a memory and a processor. When the processor executes the program stored in the memory, it can implement the following method:

[0120] Acquire the power signal and the first load signal;

[0121] Determine whether the first load signal is greater than the voltage threshold.

[0122] If the voltage is not greater than the voltage threshold, the power signal is pulse-width modulated to generate a modulated signal within a preset time in each power supply cycle, and the generation of the modulated signal is stopped at other times in each power supply cycle. The preset time is the minimum time that the load can work normally, determined according to the main control chip type and the first load signal.

[0123] If the voltage exceeds the threshold, the power signal is pulse-width modulated at each moment within each power supply cycle to generate a modulated signal.

[0124] Finally, this application also provides an embodiment corresponding to a computer-readable storage medium. The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps described in the above method embodiments.

[0125] It is understood that if the methods in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and executes all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0126] The DC-DC power supply circuit, its control method, apparatus, and medium provided in this application have been described in detail above. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0127] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A DC-DC power supply circuit, characterized in that, include: Main control chip (1), detection circuit (2), inductor (3); The first end of the detection circuit (2) is connected to the load to obtain a first load signal; wherein, the detection circuit (2) is composed of a variable resistor and a variable capacitor; The input terminal of the main control chip (1) is connected to the power supply and is used to obtain the power signal; The feedback pin of the main control chip (1) is connected to the second end of the detection circuit (2) to obtain the first load signal and determine whether the first load signal is greater than the voltage threshold. If the voltage is not greater than the voltage threshold, the power signal is pulse-width modulated to generate a modulated signal at a preset time within each power supply cycle, and the generation of the modulated signal is stopped at other times within each power supply cycle. The preset time is the minimum time that the load can work normally, determined according to the type of the main control chip (1), the inductor (3), and the first load signal. The power supply cycle is the working cycle of the main control chip (1). If the voltage exceeds the voltage threshold, the power signal is pulse-width modulated at each moment within each power supply cycle to generate the modulated signal. The first end of the inductor (3) is connected to the output end of the main control chip (1), and the second end of the inductor (3) is connected to the load, for converting the modulation signal into a power supply signal to supply power to the load.

2. The DC-DC power supply circuit according to claim 1, characterized in that, The detection circuit (2) includes: First resistor, second resistor, third resistor, first capacitor; The first end of the first resistor, the first end of the first capacitor, the second end of the inductor (3), and the load are all connected together; The second end of the first capacitor is connected to the first end of the second resistor, and the second end of the second resistor, the second end of the first resistor, and the first end of the third resistor are all connected to the feedback pin. The second terminal of the third resistor is grounded.

3. The DC-DC power supply circuit according to claim 1, characterized in that, Also includes: Energy storage circuit (4) is used to supply power to the load in the event of a power failure; The energy storage circuit (4) includes: a fourth resistor, a second capacitor, a first diode, a second diode, and a third diode; The first end of the fourth resistor is connected to the second end of the inductor (3), and the second end of the fourth resistor is connected to the anode of the second diode; The anode of the first diode is connected to the second end of the inductor (3), and the cathode of the first diode is connected to the load; The first terminal of the second capacitor is connected to both the cathode of the second diode and the anode of the third diode, and the second terminal of the second capacitor is grounded. The cathode of the third diode is connected to the load.

4. The DC-DC power supply circuit according to claim 2, characterized in that, The first resistor, the second resistor, the third resistor, and the first capacitor are all variable devices.

5. A DC-DC power supply circuit control method, characterized in that, Applied to the DC-DC power supply circuit according to any one of claims 1 to 4, the method includes: Acquire the power signal and the first load signal; Determine whether the first load signal is greater than the voltage threshold; If the voltage is not greater than the voltage threshold, the power signal is pulse-width modulated within a preset time in each power supply cycle to generate a modulated signal, and the generation of the modulated signal is stopped at other times in each power supply cycle. The preset time is the minimum time that the load can work normally, determined according to the type of the main control chip (1), the inductor (3) and the first load signal. If the voltage exceeds the voltage threshold, the power signal is pulse-width modulated at each moment within each power supply cycle to generate the modulated signal.

6. The DC-DC power supply circuit control method according to claim 5, characterized in that, Also includes: At the end of each power supply cycle, a second load signal is acquired; Determine whether the second load signal is greater than the voltage threshold; If the voltage is not greater than the voltage threshold, the power signal is pulse-width modulated within the preset time period of the power supply cycle to generate the modulated signal, and the generation of the modulated signal is stopped at other times of the power supply cycle. If the voltage exceeds the voltage threshold, the power signal is pulse-width modulated at each moment within each power supply cycle to generate the modulated signal.

7. The DC-DC power supply circuit control method according to claim 5, characterized in that, Also includes: When a power failure is detected, an alarm message is sent to the administrator.

8. A DC-DC power supply circuit control device, characterized in that, The DC-DC power supply circuit according to any one of claims 1 to 4 includes: The acquisition module is used to acquire the power signal and the first load signal; The judgment module is used to determine whether the first load signal is greater than the voltage threshold. The first generation module is used to generate a modulated signal by pulse width modulation of the power supply signal within a preset time in each power supply cycle if the voltage threshold is not greater than the voltage threshold, and to stop generating the modulated signal at other times in each power supply cycle. The preset time is the minimum time that the load can work normally, determined according to the type of the main control chip (1), the inductor (3) and the first load signal. The second generation module is used to perform pulse width modulation on the power supply signal at each moment in each of the power supply cycles to generate the modulated signal if the voltage is greater than the voltage threshold.

9. A DC-DC power supply circuit control device, characterized in that, Includes memory used to store computer programs; A processor, configured to implement the steps of the DC-DC power supply circuit control method as described in any one of claims 5 to 7 when executing the computer program.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the DC-DC power supply circuit control method as described in any one of claims 5 to 7.

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