Method for starting control of load device, power supply device, and readable storage medium

Abstract

The application relates to the technical field of circuits, in particular to a starting control method of a load device, a power supply device and a medium, the method comprising the following steps: in response to an opening instruction, controlling each switching power supply to perform a starting operation; determining the working state of each switching power supply; if there is a target switching power supply in an abnormal state, controlling the target switching power supply to enter an intermittent mode until the target switching power supply and other switching power supplies are in an opening state for at least a preset time length; and the target switching power supply and other switching power supplies supply power to the load device according to the power input by an external power supply in the opening state. The starting control method can control the target switching power supply in an abnormal state to enter an intermittent mode when starting the load device, so that the target switching power supply and other switching power supplies are in the opening state for at least the same time period, thereby synchronously starting the load device, and the efficiency and stability of starting the load device are improved.

Description

Technical Field

[0001] This application relates to the field of switching power supply technology, and in particular to a method for starting up a load device, a power supply device, and a readable storage medium. Background Technology

[0002] Switching power supplies are used to output the required voltage or current to external load devices. To start load devices with different power ratings, multiple switching power supplies need to be connected in parallel. However, due to differences in the operating parameters of different switching power supplies, it often happens that multiple switching power supplies connected in parallel cannot directly start high-power load devices. The load device needs to be started with no load or a small load before the load capacity is gradually increased. Therefore, how to solve the problem of multiple switching power supplies connected in parallel failing to directly start high-power load devices has become an urgent issue to be addressed. Summary of the Invention

[0003] This application provides a method for starting up a load device, a power supply device, and a readable storage medium, which can solve the problem in related technologies that multiple switching power supplies connected in parallel cannot directly start high-power load devices.

[0004] In a first aspect, this application provides a startup control circuit for a load device, applied to a switching power supply in a power supply device. The power supply device includes at least two switching power supplies connected in parallel. The power input interface of each switching power supply is connected to an external power source, and the power output interface of each switching power supply is connected to the load device via a DC bus. The startup control method includes: In response to the power-on command, each of the switching power supplies is controlled to perform a startup operation; Determine the operating state of each of the switching power supplies; If a target switching power supply is in an abnormal operating state, the target switching power supply is controlled to enter an intermittent mode until the target switching power supply and other switching power supplies are both in the on state for at least a preset time. When the target switching power supply and other switching power supplies are in the on state, they supply power to the load device according to the electrical energy input from the external power source to start the load device.

[0005] In some embodiments, at least two of the switching power supplies have different startup timings when performing a startup operation, wherein at least one of the switching power supplies is in an on state while at least one of the switching power supplies is in an off state.

[0006] In some embodiments, when at least one of the switching power supplies is in an off state, the load capacity output by the first switching power supply in the on state is less than the load capacity required to start the load device.

[0007] In some embodiments, when at least one switching power supply is in an off state, the total load capacity output by all switching power supplies in the on state is less than the load capacity required to start the load device.

[0008] In some embodiments, controlling the target switching power supply to enter an intermittent mode includes: The target switching power supply is cyclically controlled to enter a closed state and a closed state, wherein the open state time of the target switching power supply is longer than the closed state time of the target switching power supply.

[0009] In some embodiments, the preset duration is the time difference between the turn-on time and the turn-off time, and the time difference between the turn-on time and the turn-off time is greater than the ramp-up time of the target switching power supply.

[0010] In some embodiments, the total load capacity output by the target switching power supply and other switching power supplies within the preset time period is greater than the load capacity required for the load device to start.

[0011] In some embodiments, each of the switching power supplies includes an input unit, an output unit, a signal processing unit, and an output control unit. The output control unit is connected to the output unit. The input unit is connected to the external power supply via the power input interface. The output unit is connected to the power output interface. The signal processing unit is connected to the output control unit. The output control unit is connected to the output unit and is used to control the output unit to supply power to the load device. The cyclic control of the target switching power supply entering and exiting a shutdown state and an on state includes: An intermittent control command is sent to the signal processing unit, so that the signal processing unit performs an overcurrent intermittent control operation based on the intermittent control command; wherein, the intermittent control operation includes: sending a shutdown control signal to the output control unit for a continuous shutdown time, sending an on control signal to the output control unit for a continuous on time, returning to the step of sending a shutdown control signal to the output control unit for a continuous shutdown time, until the load device starts, wherein the shutdown control signal is used to instruct the output control unit to control the output unit to stop outputting power to the load device, and the on control signal is used to instruct the output control unit to control the output unit to output power to the load device.

[0012] Secondly, this application also provides a power supply device for connecting a load device; the power supply device includes: At least two switching power supplies are connected in parallel, each of which has its power input interface connected to an external power source and its power output interface connected to the load device via a DC bus. A main controller is connected to each of the switching power supplies and is used to implement the start-up control method for any of the load devices described above.

[0013] Thirdly, this application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, causes the processor to implement any of the above-described load device startup control methods.

[0014] This application discloses a method for controlling the startup of a load device, a power supply device, and a readable storage medium. The startup control method includes: controlling each switching power supply to perform a startup operation in response to a startup command; determining the operating state of each switching power supply; if there is a target switching power supply with an abnormal operating state, controlling the target switching power supply to enter an intermittent mode until the target switching power supply and other switching power supplies are all in an on state for at least a preset time period. While in an on state, the target switching power supply and other switching power supplies supply power to the load device based on the electrical energy input from the external power source to start the load device. This method for controlling the startup of a load device can, when starting the load device, control a target switching power supply with an abnormal state due to insufficient load capacity to enter an intermittent mode, ensuring that the target switching power supply and other switching power supplies are all in an on state for at least the same time period. This allows multiple switching power supplies to start the load device simultaneously, thereby improving the efficiency and stability of starting the load device. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a power supply device provided in an embodiment of this application; Figure 2 This is a timing diagram illustrating the startup of multiple parallel switching power supplies provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the first type of start-up control circuit provided in the embodiments of this application; Figure 4 This is a schematic diagram of the structure of the second type of start-up control circuit provided in the embodiments of this application; Figure 5 This is a schematic diagram of the third type of start-up control circuit provided in the embodiments of this application; Figure 6This is a schematic diagram of the fourth type of start-up control circuit provided in the embodiments of this application; Figure 7 This is a schematic diagram of the fifth type of start-up control circuit provided in the embodiments of this application; Figure 8 This is a schematic diagram of the sixth type of start-up control circuit provided in the embodiments of this application; Figure 9 This is a schematic diagram of the seventh type of start-up control circuit provided in the embodiments of this application; Figure 10 This is a schematic diagram of the eighth type of start-up control circuit provided in the embodiments of this application; Figure 11 This is a schematic flowchart of a load device startup control method provided in an embodiment of this application; Figure 12 This is a schematic diagram of another power supply device provided in an embodiment of this application.

[0017] Explanation of reference numerals in the attached figures: 1. Power supply equipment; 2. External power supply; 3. Load equipment; 10. Switching power supply; 100. Power input interface; 101. Start-up control circuit; 102. Power output interface; 1010. Input Unit; 1011, Output Unit; 1012. Output control unit; 105. Output feedback circuit; 106. Second isolation circuit; 107. First controller; 108. Power supply circuit; 1013, Sampling Unit; 1014. Overcurrent detection unit; 103. Comparison circuit; 104. Overcurrent protection circuit; 1040. First switching circuit; 1041. First isolation circuit; 1015. Signal processing unit; 109. Second controller; 11. Main controller. Detailed Implementation

[0018] 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, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] The flowchart shown in the attached diagram is for illustrative purposes only and does not necessarily include all content and operations / steps, nor does it necessarily have to be performed in the order described. For example, some operations / steps can be broken down, combined, or partially merged, so the actual execution order may change depending on the actual situation.

[0020] It should be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0021] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0022] Switching power supplies are used to output the required voltage or current to external load devices. To start load devices with different power ratings, multiple switching power supplies need to be connected in parallel. However, due to differences in the operating parameters of different switching power supplies, their startup sequences are inconsistent. This often results in multiple switching power supplies connected in parallel failing to directly start high-power load devices. In such cases, the load device needs to be started with no load or a small load before the load capacity is gradually increased, or a single high-power switching power supply can be used for single-channel output. However, a single high-power switching power supply is too large and cannot operate redundantly.

[0023] To address at least one of the aforementioned technical problems, embodiments of this application provide a load device startup control method, a power supply device, and a readable storage medium. This method enables a target switching power supply, which experiences an abnormal state due to insufficient load capacity in its control section, to enter an intermittent mode when starting the load device. This ensures that the target switching power supply and other switching power supplies are all in an on-state at least simultaneously for a given period, allowing multiple switching power supplies to synchronously start the load device, thereby improving the efficiency and stability of the load device startup process. The structure and working principle of the power supply device will be described in detail below.

[0024] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0025] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a power supply device 1 provided in an embodiment of this application. For example... Figure 1As shown, the power supply device 1 may include at least two parallel switching power supplies 10. Each switching power supply 10 includes a power input interface 100, a start-up control circuit 101, and a power output interface 102. The power input interface 100 is connected to an external power supply 2, and the power output interface 102 is connected to the load device 3 via a DC bus.

[0026] The external power source 2 can be an AC power source (such as 220V AC mains power) or an energy storage device, etc. The power supply device 1 converts the electrical energy provided by the external power source 2 and outputs it to the load device 3, for example, by outputting the voltage and current required by the load device 3. The power input interface 100 is used to receive the electrical energy input from the external power source 2. One end of the start-up control circuit 101 is connected to the power input interface 100, and the other end is connected to the power output interface 102. The start-up control circuit 101 is used to control the start-up and shutdown of the load device 3.

[0027] Load device 3 can be a capacitive load device, an inductive load device, or other electronic devices that require high power during startup. For example, robots, stage lighting equipment, large servers, industrial equipment, and other devices that require high power.

[0028] In some application scenarios, when power supply device 1 is used to start load device 3, the load device 3 requires a large amount of power. Therefore, multiple parallel switching power supplies 10 in power supply device 1 need to start the high-power load device 3 together. However, the operating parameters of different switching power supplies 10 are different, and the start-up sequence of different switching power supplies 10 is inconsistent. As a result, multiple parallel switching power supplies 10 often cannot directly start the high-power load device 3.

[0029] Please see Figure 2 , Figure 2 This is a timing diagram illustrating the startup of multiple parallel switching power supplies provided in an embodiment of this application. For example... Figure 2As shown, for switching power supplies A, B, and C, when power supply A completes its startup and enters the on state, power supplies B and C are still in the startup process. At this time, only power supply A supplies power to the load device 3. However, the load capacity output by power supply A is less than the load capacity required for the load device 3 to start, resulting in the inability to start the load device 3. Simultaneously, power supply A will also enter overcurrent protection due to overcurrent or overload. It should be noted that load capacity refers to the maximum load rate that the switching power supply can bear, i.e., the rated capacity. When the output current of the switching power supply exceeds the rated current, the switching power supply will activate the overcurrent / overload protection mechanism to prevent damage to the switching power supply and the load device. In this embodiment, when overcurrent protection is detected in power supply A, it can be controlled to enter intermittent mode, i.e., power supply A cycles between shutting down and starting. This ensures that power supplies A, B, and C are all on at least simultaneously for a period of time, allowing power supplies A, B, and C to simultaneously supply power to the load device 3 to start it.

[0030] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of the first type of start-up control circuit 101 provided in the embodiments of this application. For example... Figure 3 As shown, the start-up control circuit 101 includes an input unit 1010, an output unit 1011, an output control unit 1012, a sampling unit 1013, an overcurrent detection unit 1014, and a signal processing unit 1015.

[0031] The input unit 1010 is connected to the power input interface 100 and is used to convert the AC power input to the power input interface 100 into smooth DC power. For example, the input unit 1010 may include a filter circuit, a rectifier circuit, a power conversion circuit, an output rectifier circuit, and a feedback control circuit, etc. The circuit structure of the input unit 1010 is not limited in this embodiment.

[0032] Output unit 1011 is connected to power output interface 102. Output unit 1011 can be connected to input unit 1010 to convert the DC power output by input unit 1010 into AC power required by load device 3. Output unit 1011 may include PWM control circuit, power factor correction circuit, inverter circuit, buck circuit, and rectifier filter circuit, etc. The circuit structure of output unit 1011 is not limited in this embodiment.

[0033] Output control unit 1012 is connected to output unit 1011 and is used to control output unit 1011 to supply power to load device 3. When output control unit 1012 is started, it can control output unit 1011 to supply power to load device 3, for example, it can control output unit 1011 to perform constant current output or constant voltage output. When output control unit 1012 is turned off, it cannot control output unit 1011 to supply power to load device 3; at this time, output unit 1011 does not output power to load device 3.

[0034] Sampling unit 1013 is connected to output unit 1011 and is used to acquire the output sampling signal of output unit 1011. The output sampling signal may include a current sampling signal or a voltage sampling signal; that is, sampling unit 1013 can perform both current and voltage sampling. The current sampling signal is used to determine whether the switching power supply 10 is overcurrent and to control the switching power supply 10 to output a constant current. The voltage sampling signal is used to determine whether the switching power supply 10 is overvoltage and to control the switching power supply 10 to output a constant voltage.

[0035] The overcurrent detection unit 1014 is connected to the sampling unit 1013 and is used to acquire the output sampling signal collected by the sampling unit 1013, and to perform overcurrent detection on the switching power supply 10 based on the output sampling signal to obtain the overcurrent detection result.

[0036] The signal processing unit 1015 is connected to the overcurrent detection unit 1014 and is used to receive the overcurrent detection result output by the overcurrent detection unit 1014.

[0037] The signal processing unit 1015 is used to control the output control unit 1012 to enter the intermittent mode when the overcurrent detection result is an overcurrent protection signal, until the switching power supply 10 and other switching power supplies are in the on state for at least a preset time. When the switching power supply 10 and other switching power supplies are in the on state, they supply power to the load device 3 according to the electrical energy input from the external power supply 2 to start the load device 3.

[0038] It should be noted that when the switching power supply 10 enters intermittent mode, it mainly refers to the output control unit 1012 in the switching power supply 10 entering intermittent mode; when the switching power supply 10 is in the on state, it mainly refers to the output control unit 1012 in the switching power supply 10 being in the on state; and when the switching power supply 10 is in the off state, it mainly refers to the output control unit 1012 in the switching power supply 10 being in the off state. In this embodiment, the output control unit 1012 in each overcurrent-protected switching power supply 10 can be controlled to enter intermittent mode separately. In intermittent mode, the output control unit 1012 cycles between the off state and the on state. In the on state, the output control unit 1012 controls the output unit 1011 to output power to the load device 3. In the off state, the output control unit 1012 controls the output unit 1011 to stop outputting power to the load device 3. It should be noted that since the output control unit 1012 cannot send control commands to the output unit 1011 in the off state, the output unit 1011 stops outputting power to the load device 3.

[0039] In the above embodiments, by using the overcurrent detection unit 1014 to acquire the output sampling signal collected by the sampling unit 1013, and performing overcurrent detection on the switching power supply 10 based on the output sampling signal to obtain the overcurrent detection result, the signal processing unit 1015 is used to control the output control unit 1012 to enter the intermittent mode when the overcurrent detection result is an overcurrent protection signal, until the switching power supply 10 and other switching power supplies are in the on state for at least a preset time period. This can realize that when starting the load device 3, the switching power supply 10 that has overcurrent protection due to insufficient load capacity is controlled to enter the intermittent mode, so that the switching power supply 10 and other switching power supplies are in the on state for at least the same time period, thereby enabling the load device 3 to be started synchronously, thereby improving the efficiency and stability of the power supply device 1 in starting the load device 3.

[0040] It should be noted that related technologies add constant current circuits to switching power supplies and implement current-limiting protection control strategies to enable multiple parallel connections to drive large load devices for startup. However, while current-limiting protection control strategies can solve the problem of overcurrent protection in switching power supplies, prolonged current limiting and constant current to low voltage results in a high switching frequency in the switching power supply, leading to significant losses in the switching transistors and making the power supply susceptible to damage. In contrast, the embodiments of this application control the switching power supply to enter an intermittent mode when overcurrent protection occurs due to insufficient load capacity. This avoids prolonged current limiting and constant current operation, effectively preventing damage to the switching power supply, extending its lifespan, and improving its reliability.

[0041] In some embodiments, the time for the output control unit 1012 to enter the on state is greater than the time for the output control unit 1012 to enter the off state, and the preset duration is the time difference between the on time and the off time.

[0042] For example, the on-time and off-time can be set according to actual conditions, and the specific values ​​are not limited here. For example, the on-time is 3 seconds, the off-time is 2 seconds, and the preset duration is 1 second. For example, for switching power supply A, when switching power supply A is in the on state, switching power supply A and other switching power supplies are all in the on state for at least 1 second, so that switching power supply A and other switching power supplies can simultaneously supply power to load device 3 to start load device 3.

[0043] It should be noted that by setting the turn-on time of the output control unit 1012 to be longer than the turn-off time of the output control unit 1012 to be turned off, and setting the preset duration to be the time difference between the turn-on and turn-off times, it can be ensured that when the output control unit 1012 in each overcurrent-protected switching power supply 10 enters the intermittent mode, each output control unit 1012 and the output control units 1012 in other switching power supplies are in the turn-on state for at least the preset duration, thereby ensuring that different switching power supplies 10 can supply power to the load device 3 simultaneously.

[0044] In some embodiments, the turn-on time of the output control unit 1012 entering the turn-on state is greater than the turn-off time of the output control unit 1012 entering the turn-off state. The preset duration is the time difference between the turn-on time and the turn-off time, and the time difference between the turn-on time and the turn-off time is greater than the rise time of the switching power supply.

[0045] It should be noted that the rise time of the switching power supply 10 refers to the time required for its output voltage to rise from zero to a set value. By configuring the time difference between the turn-on time and the turn-off time to be greater than the rise time of the switching power supply 10, it can be ensured that the switching power supply 10 has sufficient time to output a stable voltage within a preset duration. This ensures that the switching power supply 10 and other switching power supplies can simultaneously provide stable power to the load device 3 when in the turn-on state, thereby improving the stability of starting the load device 3.

[0046] Please see Figure 4 , Figure 4 This is a schematic diagram of the structure of the second type of start-up control circuit 101 provided in an embodiment of this application. For example... Figure 4As shown, the sampling unit 1013 includes a filter capacitor E1 and a sampling resistor R0. The filter capacitor E1 is used to smooth the voltage sampling signal VOUT and suppress ripple. The voltage sampling signal VOUT provides a voltage signal for the subsequent constant voltage control. The sampling resistor R0 is connected in series in the output circuit to convert the output current of the output unit 1011 into a current sampling signal VIS.

[0047] It should be noted that the output current passes through the sampling resistor R0, generating a voltage difference proportional to the output current across the sampling resistor R0. This current sampling signal VIS is sent to the subsequent overcurrent detection unit 1014 to achieve constant current control and overcurrent detection.

[0048] In some embodiments, such as Figure 4 As shown, the overcurrent detection unit 1014 may include a comparison circuit 103 and an overcurrent protection circuit 104; the first input terminal of the comparison circuit 103 is connected to the sampling unit 1013. Figure 4 (The connection relationship is not shown in the figure). The second input terminal of the comparator circuit 103 is used to receive the reference voltage Verf. The output terminal of the comparator circuit 103 is connected to the overcurrent protection circuit 104. The overcurrent protection circuit 104 is also connected to the signal processing unit 1015.

[0049] The comparison circuit 103 is used to compare the current sampling signal VIS with the reference voltage Verf and output the voltage comparison result. The overcurrent protection circuit 104 is used to output the overcurrent detection result based on the voltage comparison result.

[0050] For example, when the voltage comparison result is a first overcurrent indication signal (i.e., the voltage of the current sampling signal VIS is greater than the reference voltage Verf), the overcurrent detection result is an overcurrent protection signal. The first overcurrent indication signal can be a high-level signal; the overcurrent protection signal can be either a high-level signal or a low-level signal.

[0051] Please see Figure 5 , Figure 5 This is a schematic diagram of the third type of start-up control circuit 101 provided in the embodiments of this application. Figure 5 As shown, the comparator circuit 103 includes an operational amplifier U1, a first resistor R1, a first capacitor C1, a second resistor R2, a third resistor R3, a second capacitor C2, a fourth resistor R4, a fifth resistor R5, a third capacitor C3, a sixth resistor R6, a first diode D1, a first Zener diode ZD1, and a seventh resistor R7.

[0052] In this configuration, the first end of the first resistor R1 is connected to the preset reference power supply VREF, the second end of the first resistor R1 is connected to the inverting input of the operational amplifier U1, the first capacitor C1 is connected between the inverting and non-inverting inputs of the operational amplifier U1, the first end of the second resistor R2 is connected to the non-inverting input of the operational amplifier U1, and the second end of the second resistor R2 is grounded, the first end of the third resistor R3 is connected to the inverting input of the operational amplifier U1, and the second end of the third resistor R3 is connected to the sampling unit 1013 (not shown in the figure), the first end of the second capacitor C2 is connected to the second end of the third resistor R3, and the second end of the second capacitor C2 is grounded, the first end of the fourth resistor R4 is connected to the non-inverting input of the operational amplifier U1, and the second end of the fourth resistor R4 is grounded, the first end of the fifth resistor R5 is connected to the output of the operational amplifier U1, the second end of the fifth resistor R5 is connected to the first end of the third capacitor C3, the second end of the third capacitor C3 is connected to the inverting input of the operational amplifier U1, and the sixth resistor R6 is connected between the second end of the third capacitor C3 and the second end of the third resistor R3.

[0053] The first terminal of the first diode D1 is connected to the output terminal of the operational amplifier U1, the second terminal of the first diode D1 is connected to the cathode of the first Zener diode ZD1, the anode of the first Zener diode ZD1 is connected to the overcurrent protection circuit 104, and the third terminal of the first diode D1 is connected to the output control unit 1012 via the seventh resistor R7 (the connection relationship is not shown in the figure).

[0054] It should be noted that the first resistor R1 and the second resistor R2 are used to divide the voltage input from the reference power supply VREF, providing the reference voltage Vref to the operational amplifier U1. The third resistor R3 and the first capacitor C1 are connected in parallel to form a proportional-integral compensation, used to optimize the stability and response speed of the loop. The second capacitor C2 and the fourth resistor R4 filter the current sampling signal VIS before sending it to the non-inverting input of the operational amplifier U1. The fifth resistor R5, the third capacitor C3, and the sixth resistor R6 are connected in series to form a feedforward compensation, used to optimize the stability and response speed of the loop. The first diode D1 and the first Zener diode ZD1 are used to achieve voltage clamping and signal isolation to protect the subsequent circuitry.

[0055] In some embodiments, operational amplifier U1 is used to compare the current sampling signal with a reference voltage and output the voltage comparison result through a first diode D1; wherein, when the voltage of the current sampling signal is greater than the reference voltage, the first diode is used to trigger the first Zener diode ZD1 to output a first overcurrent indication signal to the overcurrent protection circuit 104 and a second overcurrent indication signal FB to the output control unit 1012. The first overcurrent indication signal is used to instruct the overcurrent protection circuit 104 to output an overcurrent protection signal to the signal processing unit 1015, and the second overcurrent indication signal FB is used to instruct the output control unit 1012 to control the output unit 1011 to enter the constant current output mode.

[0056] In the above embodiment, by setting a first diode D1 at the output terminal of the operational amplifier U1, the first diode D1 can simultaneously output voltage comparison results to the overcurrent protection circuit 104 and the output control unit 1012. This enables the output unit 1011 to enter constant current output mode and the control signal processing unit 1015 to perform overcurrent protection action when an overcurrent is detected in the output unit 1011. The control logic is simple, and it also helps to simplify the circuit structure and reduce hardware costs.

[0057] Please see Figure 6 , Figure 6 This is a schematic diagram of the fourth type of start-up control circuit 101 provided in the embodiments of this application. Figure 6 As shown, the overcurrent protection circuit 104 includes a first switching circuit 1040 and a first isolation circuit 1041. The first terminal of the first switching circuit 1040 is connected to the output terminal of the comparator circuit 103, the second terminal of the first switching circuit 1040 is connected to the first isolation circuit 1041, the third terminal of the first switching circuit 1040 is grounded, and the first isolation circuit 1041 is also connected to the signal processing unit 1015.

[0058] The first switching circuit 1040 is used to control the first isolation circuit 1041 to output an overcurrent protection signal to the signal processing unit 1015 when it receives the first overcurrent indication signal output by the comparison circuit 103.

[0059] It should be noted that the first switching circuit 1040 is used to trigger the first isolation circuit 1041 to output an overcurrent protection signal according to the first overcurrent indication signal. The first isolation circuit 1041 is used to achieve electrical isolation between the input side and the output side. While transmitting the overcurrent protection signal to the signal processing unit 1015, it isolates noise, thereby improving the anti-interference capability of the circuit and ensuring the stability and safety of signal transmission.

[0060] In some embodiments, such as Figure 6As shown, the first switching circuit 1040 may include a first switching transistor Q1, an eighth resistor R8, a ninth resistor R9, and a fourth capacitor C4. The first terminal of the first switching transistor Q1 is connected to the output terminal of the comparator circuit 103 via the eighth resistor R8. The second terminal of the first switching transistor Q1 is connected to the first isolation circuit 1041. The third terminal of the first switching transistor Q1 is grounded. The ninth resistor R9 and the fourth capacitor C4 are respectively connected between the first terminal and the third terminal of the first switching transistor Q1.

[0061] The first switching transistor Q1 is used to control the first isolation circuit 1041 to turn on when it receives the first overcurrent indication signal, so that the first isolation circuit 1041 outputs an overcurrent protection signal to the signal processing unit 1015.

[0062] For example, the first switch Q1 may include, but is not limited to, a transistor, a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), an IGBT (Insulated-Gate Bipolar Transistor), a relay, and an optocoupler, etc. For instance, in this embodiment, the first switch Q1 may be an NPN transistor, and the first overcurrent indication signal may be a high-level signal. When the first switch Q1 receives the high-level first overcurrent indication signal, it turns on, inputting a low-level turn-on signal to the first isolation circuit 1041.

[0063] In some embodiments, such as Figure 6 As shown, the first isolation circuit 1041 may include a first optocoupler U2, a tenth resistor R10, and an eleventh resistor R11. The first terminal of the first optocoupler U2 is connected to the power supply VDD, the second terminal of the first optocoupler U2 is connected to the signal processing unit 1015, the third terminal of the first optocoupler U2 is connected to the power supply VDD, the fourth terminal of the first optocoupler U2 is connected to the second terminal of the first switching circuit 1040 via the eleventh resistor R11, the first terminal of the tenth resistor R10 is connected to the second terminal of the first optocoupler U2, and the second terminal of the tenth resistor R10 is grounded.

[0064] The first optocoupler U2 is used to output an overcurrent protection signal to the signal processing unit 1015 when it receives the conduction signal from the first switching circuit 1040. The tenth resistor R10 is used to provide power grounding and current limiting to ensure the normal operation of the phototransistor and the stability of the output current. The eleventh resistor R11 is a current-limiting resistor used to limit the current flowing through the light-emitting diode of the first optocoupler U2.

[0065] In some implementations, such as Figure 6As shown, the current sampling signal VIS is filtered by the second capacitor C2 and the fourth resistor R4 and then sent to the non-inverting input of the operational amplifier U1 for comparison with the reference voltage Verf at the inverting input. When the output current exceeds the threshold, i.e., the current sampling signal VIS is greater than the reference voltage Verf, the operational amplifier U1 outputs a high-level signal, which triggers the first switching transistor Q1 to conduct via the first diode D1, the first Zener diode ZD1, and the eighth resistor R8. The primary-side LED of the first optocoupler U2 then conducts and illuminates, and the secondary-side phototransistor of the first optocoupler U2 conducts, causing the first optocoupler U2 to output a high-level overcurrent protection signal to the signal processing unit 1015, triggering the signal processing unit 1015 to perform overcurrent protection. Simultaneously, the high-level signal output by the operational amplifier U1 is sent to the output control unit 1012 via the seventh resistor R7, which outputs a second overcurrent indication signal. The output control unit 1012 adjusts the output current of the output unit 1011 according to the second overcurrent indication signal FB, stabilizing the output current at a set value, thereby achieving constant current output.

[0066] Please see Figure 7 , Figure 7 This is a schematic diagram of the structure of the fifth type of start-up control circuit 101 provided in the embodiments of this application. Figure 7 As shown, the output control unit 1012 includes an output feedback circuit 105, a second isolation circuit 106, a first controller 107, and a power supply circuit 108. The output feedback circuit 105 is connected to the sampling unit 1013 and the second isolation circuit 106, respectively. The second isolation circuit 106 is also connected to the first controller 107. The first controller 107 is connected to the power supply circuit 108 and the output unit 1011.

[0067] The output feedback circuit 105 is used to acquire the voltage sampling signal output by the sampling unit 1013, and output a constant voltage control signal to the first controller 107 through the second isolation circuit 106 based on the voltage sampling signal. The first controller 107 is used to control the output unit 1011 to enter the constant voltage output mode based on the constant voltage control signal.

[0068] It should be noted that the second isolation circuit 106 is used to achieve electrical isolation between the input and output sides, isolating noise while transmitting signals, thereby improving the circuit's anti-interference capability and ensuring the stability and security of signal transmission. The first controller 107 can adjust the PWM duty cycle of the output unit 1011 according to the constant voltage control signal, thereby controlling the output unit 1011 to stabilize the output voltage.

[0069] The power supply circuit 108 supplies power to the first controller 107 to control its operating state. The power supply circuit 108 is connected to the signal processing unit and controls the first controller 107 to turn on and off according to the control signals from the signal processing unit 1015.

[0070] For example, the operating state of the first controller 107 may include an on state and an off state. The power supply circuit 108 can supply power to the first controller 107 according to the turn-on control signal of the signal processing unit 1015, and stop supplying power to the first controller 107 according to the turn-off control signal of the signal processing unit 1015. Specifically, when the power supply circuit 108 supplies power to the first controller 107, the first controller 107 is in the on state; when the power supply circuit 108 stops supplying power to the first controller 107, the first controller 107 is in the off state.

[0071] It should be noted that, in the ON state, the first controller 107 can control the output unit 1011 to supply power to the load device 3. For example, the first controller 107 controls the output unit 1011 to perform constant current output or constant voltage output. In the OFF state, the first controller 107 does not work and cannot control the output unit 1011 to supply power to the load device 3.

[0072] In the above embodiment, by connecting the first controller 107 and the power supply circuit 108, the power supply circuit 108 can be used to control the opening and closing of the first controller 107. The control logic is simple and can effectively simplify the circuit structure.

[0073] In some embodiments, such as Figure 7 As shown, the overcurrent detection unit 1014 may include a comparator circuit 103, and an output feedback circuit 105 is also connected to the comparator circuit 103. The output feedback circuit 105, upon receiving the second overcurrent indication signal FB output by the comparator circuit 103, outputs a constant current control signal to the first controller 107 via a second isolation circuit 106. The first controller 107 controls the output unit 1011 to enter a constant current output mode based on the constant current control signal.

[0074] Please see Figure 8 , Figure 8 This is a schematic diagram of the sixth type of start-up control circuit 101 provided in the embodiments of this application. Figure 8As shown, the output feedback circuit 105 includes a twelfth resistor R12, a thirteenth resistor R13, a reference source U3, a fourteenth resistor R14, a fifth capacitor C5, and a sixth capacitor C6. The first end of the twelfth resistor R12 is connected to the sampling unit 1013, and the second end of the twelfth resistor R12 is connected to the reference terminal of the reference source U3. The first end of the thirteenth resistor R13 is connected to the second end of the twelfth resistor R12, and the second end of the thirteenth resistor R13 is grounded. The cathode of the reference source U3 is connected to the second isolation circuit 106, and the anode of the reference source U3 is grounded. The first end of the fourteenth resistor R14 is connected to the cathode of the reference source U3, and the second end of the fourteenth resistor R14 is connected to the reference terminal of the reference source U3 via the fifth capacitor C5. The sixth capacitor C6 is connected between the reference terminal and the cathode of the reference source U3.

[0075] It should be noted that the reference source U3 is a precision reference source used to compare the sampled voltage of the output unit 1011 with the internal reference voltage, and output the voltage comparison result to the first controller 107 through the second isolation circuit 106 so that the first controller 107 can adjust the output current and / or output voltage of the output unit 1011 according to the power comparison result.

[0076] like Figure 8 As shown, the second isolation circuit 106 includes a second optocoupler U4, a fifteenth resistor R15, a sixteenth resistor R16, and a seventeenth resistor R17. The first terminal of the second optocoupler U4 is connected to the first controller 107 through the fifteenth resistor R15. The second terminal of the second optocoupler U4 is grounded. The third terminal of the second optocoupler U4 is connected to the first terminal of the sixteenth resistor R16. The second terminal of the sixteenth resistor R16 is connected to the power supply VDD. The fourth terminal of the second optocoupler U4 is connected to the cathode of the reference source U3. The seventeenth resistor R17 is connected between the first terminal of the sixteenth resistor R16 and the cathode of the reference source U3.

[0077] Among them, the twelfth resistor R12 and the thirteenth resistor R13 are used to divide the voltage of the voltage sampling signal VOUT and input the sampling voltage to the reference terminal of the reference source U3. The reference source U3 is used to compare the sampling voltage with the internal reference voltage, and when the sampling voltage is greater than the reference voltage, it outputs a conduction signal to the second optocoupler U4. The second optocoupler U4 outputs a constant voltage control signal to the first controller 107 based on the conduction signal output by the reference source U3. It should be noted that when the sampling voltage is greater than the reference voltage, the reference source U3 conducts, pulling down the level of the fourth terminal of the second optocoupler U4, causing the primary-side light-emitting diode of the second optocoupler U4 to emit light. The secondary-side phototransistor of the second optocoupler U4 receives the light signal and conducts, inputting a low-level constant voltage control signal to the first controller 107, so that the first controller 107 adjusts the output unit 1011 according to the constant voltage control signal. Figure 8The PWM duty cycle (not shown in the figure) is used to control the output unit 1011 to stabilize the output voltage.

[0078] like Figure 8 As shown, the first controller 107 may include a processor or a microcontroller, which outputs control signals to the output unit 1011 through corresponding pins. This application embodiment does not limit the type of the first controller 107.

[0079] like Figure 8 As shown, resistor R14 (fourteenth), capacitor C5 (fifth), and capacitor C6 (sixth) form a proportional-integral compensation network to optimize the stability of the feedback loop and suppress oscillations, thereby improving the dynamic response of the circuit. Resistor R15 (fifteenth) is a current-limiting resistor, limiting the current flowing into the secondary phototransistor of the second optocoupler U4 to prevent excessive current from damaging the device, and also matching the driving capability of the first controller 107. Resistor R16 (sixteenth) is a current-limiting resistor, used to limit the current flowing into the primary-side LED of the second optocoupler U4. Resistor R17 (seventeenth) is a current-limiting resistor, used to limit the current flowing into the reference source U3, and also smooth the signal edges of the primary side of the second optocoupler U4 to avoid high-frequency interference.

[0080] Please see Figure 9 , Figure 9 This is a schematic diagram of the structure of the seventh type of start-up control circuit 101 provided in the embodiments of this application. For example... Figure 9 As shown, the signal processing unit 1015 includes a second controller 109, which is connected to the overcurrent detection unit 1014 and the output control unit 1012.

[0081] The second controller 109 is used to cyclically control the output control unit 1012 to enter the off state and the on state when it receives the overcurrent protection signal output by the overcurrent detection unit 1014. The on state of the output control unit 1012 is longer than the off state of the output control unit 1012.

[0082] like Figure 9 As shown, the second controller 109 may include a processor or a microcontroller, which outputs control signals to the output control unit 1012 via corresponding pins. This application embodiment does not limit the type of the second controller 109.

[0083] In some embodiments, such as Figure 9 As shown, the output control unit 1012 includes a first controller 107 and a power supply circuit 108, which is connected to a second controller 109 and a first controller 107.

[0084] The power supply circuit 108 is used to stop supplying power to the first controller 107 when it receives the shutdown control signal sent by the second controller 109, so that the first controller 107 enters the shutdown state. After the first controller 107 enters the shutdown state, it stops the control output unit 1011 from outputting electrical energy to the load device 3.

[0085] The power supply circuit 108 is also used to supply power to the first controller 107 when it receives the conduction control signal sent by the second controller 109, so that the first controller 107 enters the on state. After the first controller 107 enters the on state, the control output unit 1011 outputs electrical energy to the load device 3.

[0086] Please see Figure 10 , Figure 10 This is a schematic diagram of the eighth type of start-up control circuit 101 provided in the embodiments of this application. For example... Figure 10 As shown, the power supply circuit 108 may include a second switch circuit 1080 and a third switch circuit 1081. The first terminal of the second switch circuit 1080 is connected to the second controller 109, the second terminal of the second switch circuit 1080 is connected to the first terminal of the third switch circuit 1081, the third terminal of the second switch circuit 1080 is grounded, the second terminal of the third switch circuit 1081 is connected to the power supply VCC, and the third terminal of the third switch circuit 1081 is connected to the first controller 107.

[0087] like Figure 10 As shown, the second controller 109, upon receiving the overcurrent protection signal OCP output by the overcurrent detection unit 1014, cyclically controls the output control unit 1012 to enter a closed state and an open state. For example, it controls the first controller 107 to cyclically enter a closed state and an open state. The overcurrent protection signal can be represented as OCP. When controlling the first controller 107 to enter a closed state, the second controller 109 can send a shutdown control signal to the second switching circuit 1080. Similarly, when controlling the first controller 107 to enter a closed state, the second controller 109 can send a shutdown control signal to the second switching circuit 1080.

[0088] In some embodiments, the second switch circuit 1080 is used to control the third switch circuit 1081 to disconnect the power supply VCC from the first controller 107 when it receives a shutdown control signal sent by the second controller 109, so that the first controller 107 enters a shutdown state; the second switch circuit 1080 is also used to control the third switch circuit 1081 to connect the power supply VCC from the first controller 107 when it receives a conduction control signal sent by the second controller 109, so that the first controller 107 enters an on state after being powered on.

[0089] For example, the shutdown control signal can be represented as OFF.

[0090] In some embodiments, such as Figure 10 As shown, the second switching circuit 1080 includes a second switching transistor Q2, an eighteenth resistor R18, a nineteenth resistor R19, a seventh capacitor C7, and a twentieth resistor R20. The first terminal of the second switching transistor Q2 is connected to the second controller 109 through the eighteenth resistor R18, and the second terminal of the second switching transistor Q2 is connected to the first terminal of the third switching circuit 1081 through the nineteenth resistor R19. The third terminal of the second switching transistor Q2 is grounded, and the seventh capacitor C7 and the twentieth resistor R20 are respectively connected between the first terminal and the third terminal of the second switching transistor Q2.

[0091] The third switching circuit 1081 includes a third switching transistor Q3, a twenty-first resistor R21, a second diode D2, a second Zener diode ZD2, and an eighth capacitor C8. The first terminal of the third switching transistor Q3 is connected to the nineteenth resistor R19, the second terminal of the third switching transistor Q3 is connected to the power supply VCC, and the third terminal of the third switching transistor Q3 is connected to the first controller 107. The twenty-first resistor R21 is connected between the first and second terminals of the third switching transistor Q3. The anode of the second diode D2 is connected to the third terminal of the third switching transistor Q3, and the cathode of the second diode D2 is connected to the first terminal of the third switching transistor Q3. The cathode of the second Zener diode ZD2 is connected to the first terminal of the third switching transistor Q3, and the anode of the second Zener diode ZD2 is grounded. The first terminal of the eighth capacitor C8 is connected to the second terminal of the third switching transistor Q3, and the second terminal of the eighth capacitor C8 is grounded.

[0092] Specifically, when the second controller 109 sends a shutdown control signal, the second switch Q2 turns on, pulling down the level of the first terminal of the third switch Q3, and the third switch Q3 turns off, disconnecting the power supply VCC from the first controller 107, so that the first controller 107 enters the shutdown state; when the second controller 109 sends a turn-on control signal, the second switch Q2 turns off, and the third switch Q3 is used to turn on the power supply VCC from the first controller 107 when the second switch Q2 turns off, so that the first controller 107 enters the turn-on state.

[0093] For example, the second switch Q2 and the third switch Q3 can be, but are not limited to, transistors, field-effect transistors, insulated-gate bipolar transistors, relays, and optocouplers. For instance, the second switch Q2 can be an N-type transistor that turns on when it receives a high-level turn-off control signal and turns off when it receives a low-level turn-on control signal. The third switch Q3 can be an N-type MOSFET that turns off when its first terminal (i.e., the control terminal) receives a low-level signal, thereby disconnecting the power supply VCC from the first controller 107; and turns on when its first terminal receives a high-level signal, thereby connecting the power supply VCC to the first controller 107.

[0094] For example, such as Figure 10 As shown, when the third switch Q3 is off, the first controller 107 does not receive the VCC-PFM signal, that is, it does not receive the power supply signal. At this time, the first controller 107 is in the off state. When the third switch Q3 is on, the first controller 107 receives the VCC-PFM signal, and the first controller 107 starts up and enters the on state.

[0095] In the above embodiment, by configuring the second controller 109 to control the first controller 107 to cycle between the off and on states when it receives the overcurrent protection signal OCP output by the overcurrent detection unit 1014, the second controller 109 can achieve the following: when starting the load device, the switching power supply that has overcurrent protection due to insufficient load capacity enters the intermittent mode, so that the switching power supply and other switching power supplies are in the on state at least at the same time period, thereby enabling the load device to be started synchronously, and thus improving the efficiency and stability of the power supply in starting the load device.

[0096] Please see Figure 11 , Figure 11 This is a schematic flowchart illustrating a method for starting up a load device according to an embodiment of this application, such as... Figure 11 As shown, the start-up control method for the load device may include steps S401 to S403.

[0097] Step S401: In response to the start command, control each switching power supply to perform a start operation.

[0098] For example, when the power supply device detects that a user has pressed or clicked the power button on the power supply device, it can generate a power-on command and then control each switching power supply in the power supply device to perform a startup operation in response to the power-on command; or when the power supply device detects that a load device is connected to or communicating with the power supply device, it can automatically generate a power-on command and control each switching power supply in the power supply device to perform a startup operation in response to the power-on command.

[0099] The startup operation refers to a series of startup procedures that a switching power supply needs to perform during startup. These procedures may include AC input, voltage adjustment, power switching, startup circuit activation, voltage detection, protection detection, switching action, and regulated output. Different switching power supplies have different operating parameters, resulting in inconsistent startup sequences, meaning the time required to execute the startup operation procedures varies.

[0100] In some embodiments, at least two switching power supplies have different startup timings when performing a startup operation, wherein at least one switching power supply is in an off state while at least one switching power supply is in an on state.

[0101] It should be noted that "on" means the switching power supply has completed the entire startup process, while "off" means the switching power supply has not completed the startup process. For example, such as... Figure 2 As shown, for switching power supplies A, B, and C, when switching power supply A completes its startup and enters the on state, switching power supplies B and C are still in the startup process, i.e., in the off state. This is understandable. Figure 2 When the current of the switching power supply is 1, it indicates that it is in the on state; when the current is 0, it indicates that it is in the off state.

[0102] In some embodiments, when at least one switching power supply is in an off state, the load capacity output by the first switching power supply in the on state is less than the load capacity required to start the load device.

[0103] For example, such as Figure 2 As shown, when switching power supplies B and C are still in the startup process, switching power supply A is the first to be turned on. The load capacity output by switching power supply A is less than the load capacity required for the load device to start. At this time, switching power supply A will enter overcurrent protection mode or overload protection mode because the output current exceeds the rated current.

[0104] In some embodiments, when at least one switching power supply is in an off state, the total load capacity output by all switching power supplies in the on state is less than the load capacity required to start the load device.

[0105] For example, such as Figure 2As shown, when switching power supplies A and B complete startup and enter the on state, switching power supply C is still in the off state. At this time, the total load capacity output by switching power supplies A and B is less than the load capacity required for the load device to start. Switching power supplies A and B will enter overcurrent protection or overload protection state because the output current exceeds the rated current.

[0106] Step S402: Determine the operating status of each switching power supply.

[0107] For example, the operating status of each switching power supply can be detected by the detection circuit in the power supply device. Of course, the operating status of each switching power supply can also be detected by the detection circuit inside each switching power supply and reported to the power supply device.

[0108] The operating status can include normal and abnormal states. Abnormal states refer to overcurrent protection, overload protection, overvoltage protection, overtemperature protection, and low-temperature protection, etc. Normal states refer to the state where the switching power supply can normally supply power to the load device, i.e., no one of the following protection states occurs: overcurrent protection, overload protection, overvoltage protection, overtemperature protection, or low-temperature protection. It should be noted that overcurrent / overload protection means that when the power supply output current exceeds the rated current, the switching power supply will activate the overcurrent / overload protection mechanism to prevent damage to the switching power supply and the load device.

[0109] In some implementations, a current detection circuit can be used to detect whether each switching power supply has overcurrent or overload protection, a voltage detection circuit can be used to detect whether each switching power supply has overvoltage protection, and a temperature detection circuit can be used to detect whether each switching power supply has overtemperature or undertemperature protection. The circuit structure and detection principle of the current detection circuit, voltage detection circuit, and temperature detection circuit can be found in related technologies and will not be elaborated here.

[0110] In the above embodiments, by determining the operating state of each switching power supply, the target switching power supply in an abnormal state can be controlled in an intermittent mode in a timely manner, which can realize overcurrent protection for the target switching power supply, and at the same time, it can also ensure that the target switching power supply and other switching power supplies are all in the on state during the same time period.

[0111] Step S403: If there is a target switching power supply in an abnormal working state, control the target switching power supply to enter intermittent mode until the target switching power supply and other switching power supplies are both in the on state for at least a preset time. When the target switching power supply and other switching power supplies are in the on state, they supply power to the load device according to the electrical energy input from the external power supply to start the load device.

[0112] In this embodiment, the abnormal state mainly refers to the overcurrent protection state or overload protection state of the switching power supply. When the switching power supply is in the overcurrent protection state or overload protection state, the switching power supply is controlled to enter the intermittent mode.

[0113] In some implementations, a switching power supply operating in overcurrent protection or overload protection mode is identified as the target switching power supply. This target switching power supply is then controlled to enter an intermittent mode until both the target switching power supply and other switching power supplies are in an on-state for at least a preset duration. Specifically, when both the target switching power supply and other switching power supplies are in an on-state, the total load capacity output by the target switching power supply and other switching power supplies within the preset duration exceeds the load capacity required to start the load device, thereby enabling the load device to start.

[0114] In some embodiments, controlling the target switching power supply to enter an intermittent mode may include: cyclically controlling the target switching power supply to enter a shutdown state and an on state, wherein the on-time of the target switching power supply entering the on state is greater than the off-time of the target switching power supply entering the off state. The preset duration is the time difference between the on-time and off-time.

[0115] For example, the start time and stop time can be set according to the actual situation, and the specific values ​​are not limited here. For example, the start time is 3 seconds, the stop time is 2 seconds, and the preset duration is 1 second.

[0116] In the above embodiments, by configuring the turn-on time of the target switching power supply to enter the turn-on state to be greater than the turn-off time of the target switching power supply to enter the turn-off state, and the preset duration is the time difference between the turn-on time and the turn-off time, it can be ensured that after the target switching power supply enters the intermittent mode, the target switching power supply and other switching power supplies are in the turn-on state for at least the preset duration, thereby ensuring that different switching power supplies can supply power to the load device at the same time.

[0117] In some embodiments, the preset duration is the time difference between the turn-on time and the turn-off time, and the time difference between the turn-on time and the turn-off time is greater than the ramp-up time of the target switching power supply.

[0118] By configuring the time difference between the turn-on and turn-off times to be greater than the rise time of the target switching power supply, it can be ensured that the target switching power supply has sufficient time to output a stable voltage within a preset duration. This ensures that the target switching power supply and other switching power supplies can simultaneously provide stable power to the load device when in the turn-on state, thereby improving the stability of starting the load device.

[0119] Please see Figure 1 and Figure 3Each switching power supply 10 may include a power input interface 100, a start control circuit 101, and a power output interface 102. The start control circuit 101 may include an input unit 1010, an output unit 1011, a signal processing unit 1015, and an output control unit 1012. The output control unit 1012 is connected to the output unit 1011. The input unit 1010 is connected to the external power supply 2 via the power input interface 100. The output unit 1011 is connected to the power output interface 102. The signal processing unit 1015 is connected to the output control unit 1012. The output control unit 1012 is connected to the output unit 1011 and is used to control the output unit 1011 to supply power to the load device 3.

[0120] The specific circuit structures of the overcurrent detection unit 1014, signal processing unit 1015, and output control unit 1012 can be found in the detailed description of the above embodiments. Figures 4 to 10 This will not be elaborated upon here.

[0121] In some embodiments, cyclically controlling the target switching power supply to enter a shutdown state and an on state may include: sending an intermittent control command to a signal processing unit, so that the signal processing unit can perform an overcurrent intermittent control operation based on the intermittent control command; wherein the intermittent control operation includes: sending a shutdown control signal to the output control unit during a continuous shutdown period, sending an on control signal to the output control unit during a continuous on period, returning to the step of sending a shutdown control signal to the output control unit during a continuous shutdown period, until the load device starts, wherein the shutdown control signal is used to instruct the output control unit to control the output unit to stop outputting power to the load device, and the on control signal is used to instruct the output control unit to control the output unit to output power to the load device.

[0122] For example, the intermittent control command can be an overcurrent protection signal generated by the overcurrent detection unit when the sampling unit detects an overcurrent in the output unit, or it can be a command sent directly by the controller in the power supply to the signal processing unit in the target switching power supply.

[0123] It should be noted that, in the embodiments of this application, the process of controlling the target switching power supply to enter the intermittent mode can be implemented by each circuit module in the start control circuit. For example, the overcurrent detection unit acquires the output sampling signal collected by the sampling unit, and performs overcurrent detection on the switching power supply based on the output sampling signal to obtain the overcurrent detection result. When the overcurrent detection result is an overcurrent protection signal, the signal processing unit controls the output control unit to enter the intermittent mode. For example, the signal processing unit can send a shutdown control signal and an on control signal to the output control unit in a loop. When the output control unit receives the shutdown control signal, it controls the output unit to stop outputting power to the load device. When the output control unit receives the on control signal, it controls the output unit to output power to the load device.

[0124] In the above embodiments, by sending a shutdown control signal to the output control unit during the continuous shutdown period and an on control signal to the output control unit during the continuous on period, the target switching power supply and other switching power supplies can be in the on state for at least the same time period. This allows multiple switching power supplies to start the load device synchronously, thereby improving the efficiency and stability of starting the load device.

[0125] Figure 12 This is a schematic diagram of another power supply device 1 provided in an embodiment of this application. For example... Figure 12 As shown, the power supply device 1 includes at least two parallel switching power supplies 10 and a main controller 11. The power input interface 100 of each switching power supply 10 is connected to an external power supply 2, and the power output interface 102 of each switching power supply 10 is connected to the load device 3 via a DC bus. The main controller 11 is connected to each switching power supply 10.

[0126] For example, in combination Figure 9 and 12 The main controller 11 can be connected to the signal processing unit 1015 (e.g., the second controller 109) in each switching power supply 10, and is used to send intermittent control commands to the second controller 109. Of course, the main controller 11 can also be the signal processing unit 1015 in the switching power supply 10. For example, when the signal processing unit 1015 detects that the switching power supply 10 is in an abnormal state, it controls the output control unit 1012 (e.g., the first controller 107) to enter intermittent mode.

[0127] The embodiments of this application also provide a computer-readable storage medium storing a computer program, the computer program including program instructions, and a processor executing the program instructions to implement any of the load device startup control methods provided in the embodiments of this application.

[0128] For example, when the program is loaded by the processor, it can perform the following steps: In response to the start command, control each switching power supply to perform a start operation; determine the operating status of each switching power supply; if there is a target switching power supply with an abnormal operating status, control the target switching power supply to enter an intermittent mode until the target switching power supply and other switching power supplies are all in the on state for at least a preset time. When the target switching power supply and other switching power supplies are in the on state, they all supply power to the load device according to the electrical energy input from the external power supply to start the load device.

[0129] The computer-readable storage medium can be an internal storage unit of the power supply device described in the foregoing embodiments, such as the hard disk or memory of the power supply device. Alternatively, the computer-readable storage medium can be an external storage device of the power supply device, such as a plug-in hard disk, smart media card (SMC), secure digital card (SD card), flash card, etc., provided on the power supply device.

[0130] Furthermore, the computer-readable storage medium may primarily include a stored program area and a stored data area, wherein the stored program area may store the operating system, an application program required for at least one function, etc.; and the stored data area may store data created based on the use of blockchain nodes, etc.

[0131] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for starting control of a load device, characterized in that, The method, applied in a power supply device, includes at least two parallel switching power supplies, each of which has its power input interface connected to an external power source and its power output interface connected to the load device via a DC bus. In response to a power-on command, each of the switching power supplies is controlled to perform a startup operation, and at least two of the switching power supplies have different startup timings when performing the startup operation; Determine the operating state of each of the switching power supplies; If there is a target switching power supply whose working state is abnormal, then the target switching power supply is controlled to enter the intermittent mode until the target switching power supply and other switching power supplies are all in the on state for at least a preset time. When the target switching power supply and other switching power supplies are in the on state, they all supply power to the load device according to the electrical energy input from the external power supply to start the load device. The control of the target switching power supply to enter intermittent mode includes: cyclically controlling the target switching power supply to enter a shutdown state and an on state, wherein the on time of the target switching power supply entering the on state is greater than the off time of the target switching power supply entering the shutdown state, and the preset duration is the time difference between the on time and the off time.

2. The method for starting control of a load device according to claim 1, characterized in that, At least one of the switching power supplies is in an on state when it is in an off state.

3. The method for starting control of a load device according to claim 2, characterized in that, When at least one of the switching power supplies is in an off state, the load capacity output by the first switching power supply in the on state is less than the load capacity required to start the load device.

4. The method for starting control of a load device according to claim 2, characterized in that, When at least one switching power supply is in an off state, the total load capacity output by all switching power supplies in the on state is less than the load capacity required to start the load device.

5. The method for starting control of a load device according to claim 1, characterized in that, The time difference between the turn-on time and the turn-off time is greater than the ramp-up time of the target switching power supply.

6. The method for starting control of a load device according to claim 1, characterized in that, The total load capacity output by the target switching power supply and other switching power supplies within the preset time period is greater than the load capacity required for the load device to start.

7. The method for starting control of a load device according to claim 1, characterized in that, Each of the switching power supplies includes an input unit, an output unit, a signal processing unit, and an output control unit. The output control unit is connected to the output unit. The input unit is connected to the external power supply via the power input interface. The output unit is connected to the power output interface. The signal processing unit is connected to the output control unit. The output control unit is connected to the output unit and is used to control the output unit to supply power to the load device. The cyclic control of the target switching power supply to enter the off state and the on state includes: Send an intermittent control command to the signal processing unit so that the signal processing unit can perform an overcurrent intermittent control operation based on the intermittent control command; The intermittent control operation includes: continuously sending a shutdown control signal to the output control unit for the shutdown time, continuously sending an on control signal to the output control unit for the on time, returning to the step of continuously sending a shutdown control signal to the output control unit for the shutdown time, until the load device starts. The shutdown control signal is used to instruct the output control unit to control the output unit to stop outputting power to the load device, and the on control signal is used to instruct the output control unit to control the output unit to output power to the load device.

8. A power supply device, characterized in that, The power supply device is used to connect to the load device; the power supply device includes: At least two switching power supplies are connected in parallel, each of which has its power input interface connected to an external power source and its power output interface connected to the load device via a DC bus. A main controller is connected to each of the switching power supplies and is used to implement the start-up control method for the load device as described in any one of claims 1 to 7.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, causes the processor to implement the startup control method for the load device as described in any one of claims 1 to 7.

Images