A driving power supply and a control method thereof

Abstract

The application discloses a driving power supply and a control method thereof. The driving power supply comprises a control circuit and a power circuit. The power circuit is used for supplying power to a load. The control circuit comprises a current detection circuit and a reaction circuit. The current detection circuit is used for detecting the power supply current of the power circuit to the load and judging whether the power circuit is in an idle state according to the power supply current. The reaction circuit is used for adjusting the output voltage of the power circuit to a first voltage when the power circuit is in the idle state and adjusting the output voltage of the power circuit to a second voltage when the power circuit is in a load state. The application can avoid the damage of the load caused by the too high impact surge current when the load is suddenly connected to the power circuit when the load is reconnected. The low working voltage can provide a small current which is detected by the control circuit, and the voltage of the power circuit is adjusted back to the second voltage.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of driving power supply, in particular to a driving power supply and a control method thereof. BACKGROUND

[0002] In some application scenarios, the driving power supply is externally connected to the load. For example, in a plant factory, the power supply is externally connected to the LED lamp and supplies power to the lamp. When the LED load of the traditional driving power supply is damaged, the driving power supply must be powered off first, and then the load is replaced, otherwise a surge current will be generated at the moment of connecting the new load, causing damage to the load or reducing the service life of the load. Similarly, when installing a new driving power supply, the load must be connected before power-on. This operation mode makes the replacement and installation of the load and the driving power supply more troublesome.

[0003] Therefore, it is necessary to add a hot plug function to the existing driving power supply, that is, how to provide a driving power supply for installing and replacing the load without power failure and without causing adverse effects on the load, which is a problem to be solved by those skilled in the art. SUMMARY

[0004] The purpose of the present application is to provide a driving power supply and a control method thereof to solve the problem that the existing driving power supply cannot provide a hot plug function without causing adverse effects on the load.

[0005] To solve the above technical problems, the present application provides a driving power supply comprising a control circuit and a power circuit.

[0006] The power circuit is used to supply power to the load.

[0007] The control circuit comprises a current detection circuit and a reaction circuit.

[0008] The current detection circuit is used to detect the power supply current of the power circuit to the load and determine whether the power circuit is in an idle state according to the power supply current.

[0009] The reaction circuit is used to adjust the output voltage of the power circuit to a first voltage when the power circuit is in an idle state, and adjust the output voltage of the power circuit to a second voltage when the power circuit is in a load state.

[0010] The first voltage is less than the second voltage.

[0011] Optionally, in the driving power supply, the reaction circuit comprises a loop control circuit and a loop circuit.

[0012] The loop control circuit outputs a feedback signal to the loop circuit according to the working state of the power circuit determined by the current detection circuit.

[0013] The loop circuit sends a control signal to the power circuit according to the feedback signal, so that the power circuit adjusts the output voltage according to the control signal.

[0014] Optionally, in the driving power supply, the loop circuit comprises a first operational amplifier, a first feedback resistor and a first feedback capacitor.

[0015] The first feedback capacitor and the first feedback resistor are connected in series between the output terminal and the inverting terminal of the first operational amplifier.

[0016] The non-inverting terminal of the first operational amplifier receives a first reference voltage.

[0017] The inverting terminal collects a voltage signal from the power circuit.

[0018] The output terminal is connected to the power circuit.

[0019] The output terminal of the loop control circuit is connected to the non-inverting terminal of the first operational amplifier, for providing the first reference voltage of the first operational amplifier.

[0020] Optionally, in the driving power supply, the loop circuit comprises a first operational amplifier, a first feedback resistor and a first feedback capacitor.

[0021] The first feedback capacitor and the first feedback resistor are connected in series between the output terminal and the inverting terminal of the first operational amplifier.

[0022] The non-inverting terminal of the first operational amplifier receives a first reference voltage.

[0023] The inverting terminal collects a voltage signal from the power circuit.

[0024] The output terminal is connected to the power circuit.

[0025] The output terminal of the loop control circuit is connected to the non-inverting terminal of the first operational amplifier, for providing the first reference voltage of the first operational amplifier.

[0026] Optionally, in the driving power supply, the current detection circuit and the loop control circuit are integrated in one integrated circuit chip.

[0027] Optionally, in the driving power supply, the maximum value of the first voltage is 0.80 to 0.95 times the maximum value of the second voltage, including the end point value.

[0028] A driving power supply control method comprises:

[0029] Obtaining the power supply current of the power circuit from the current detection circuit.

[0030] determining whether the power circuit is in an idle state according to the supply current;

[0031] when the power circuit is in the idle state, reducing an output voltage of the power circuit to a first voltage; and when the power circuit is in a load state, adjusting the output voltage of the power circuit to a second voltage; the first voltage is less than the second voltage.

[0032] Optionally, in the driving power supply control method, the determining whether the power circuit is in the idle state according to the supply current comprises:

[0033] determining whether the supply current exceeds a motion current threshold value;

[0034] when the supply current exceeds the motion current threshold value, determining that the power circuit is in the load state; and when the supply current does not exceed the motion current threshold value, determining that the power circuit is in the idle state.

[0035] Optionally, in the driving power supply control method, the determining whether the power circuit is in the idle state according to the supply current comprises:

[0036] acquiring a supply current change rate in a preset time interval through the supply current;

[0037] determining a size relationship between the supply current change rate and preset first and second change threshold values; the first change threshold value is a positive value, and the second change threshold value is a negative value;

[0038] when the supply current change rate is greater than the first change threshold value, determining that the power circuit is in the load state; and when the supply current change rate is less than the second change threshold value, determining that the power circuit is in the idle state.

[0039] Optionally, in the driving power supply control method, the adjusting the output voltage of the power circuit to the first voltage or the second voltage is stepwise adjustment.

[0040] The driving power supply provided by this invention includes a control circuit and a power circuit. The power circuit supplies power to the load. The control circuit includes a current detection circuit and a response circuit. The current detection circuit detects the supply current of the power circuit to the load and determines whether the power circuit is unloaded based on the supply current. The response circuit adjusts the output voltage of the power circuit to a first voltage when the power circuit is unloaded and adjusts the output voltage of the power circuit to a second voltage when the power circuit is loaded. The first voltage is less than the second voltage. This invention monitors the supply current of the power circuit to the load through the control circuit. When the load is damaged or there is no load, the power circuit has no current output, indicating that the power circuit is in an unloaded state. The control circuit lowers the output voltage of the power circuit to the first voltage. This avoids damage to the load due to excessive surge current caused by the sudden connection of the load to the power circuit when the load is reconnected. When a new load is connected to the power circuit in the unloaded state, the circuit between the power circuit and the load is closed, and the low operating voltage provides a small current, which is detected by the control circuit. The voltage of the power circuit is then adjusted back to the second voltage, completing the hot-plugging process. The present invention also provides a drive power supply control method with the above-mentioned beneficial effects. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figures 1 to 6 Schematic diagrams of various specific embodiments of the driving power supply provided by the present invention;

[0043] Figure 7 A flowchart illustrating a specific embodiment of the drive power supply control method provided by the present invention;

[0044] Figure 8 This is a schematic diagram of a specific embodiment of the drive power control device provided by the present invention. Detailed Implementation

[0045] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] The core of this invention is to provide a driving power supply, the structural schematic diagram of one specific embodiment of which is shown below. Figure 1 As shown, this is referred to as Specific Implementation Method 1, which includes a control circuit 200 and a power circuit 100;

[0047] The power circuit 100 is used to supply power to the load;

[0048] The control circuit 200 includes a current detection circuit 210 and a reaction circuit 220;

[0049] The current detection circuit 210 is used to detect the power supply current of the power circuit 100 to the load, and to determine whether the power circuit 100 is unloaded based on the power supply current.

[0050] The reaction circuit 220 is used to adjust the output voltage of the power circuit 100 to a first voltage when the power circuit 100 is unloaded, and to adjust the output voltage of the power circuit 100 to a second voltage when the power circuit 100 is loaded.

[0051] The first voltage is less than the second voltage.

[0052] As one specific implementation method, its structural diagram is as follows: Figure 2 As shown, the reaction circuit 220 includes a loop control circuit 221 and a loop circuit 222;

[0053] The loop control circuit 221 outputs a feedback signal to the loop circuit 222 based on the operating state of the power circuit 100 determined by the current detection circuit 210.

[0054] The loop circuit 222 sends a control signal to the power circuit 100 according to the feedback signal, so that the power circuit 100 adjusts the output voltage according to the control signal.

[0055] Specifically, the loop circuit 222 outputs a control signal to the power circuit 100 based on the feedback signal, thereby adjusting the output voltage of the power circuit 100.

[0056] Furthermore, the loop circuit 222 includes a first operational amplifier U1, a first feedback resistor R1, and a first feedback capacitor C1;

[0057] The first feedback capacitor C1 and the first feedback resistor R1 are connected in series between the output terminal and the inverting terminal of the first operational amplifier U1;

[0058] The non-inverting input of the first operational amplifier U1 receives a first reference voltage;

[0059] The inverting input acquires a voltage signal from the power circuit 100;

[0060] The output terminal is connected to the power circuit 100 via a signal.

[0061] More specifically, the power circuit 100 includes a sampling circuit connected in parallel with the load;

[0062] The sampling circuit includes a first sampling voltage divider resistor R2 and a second sampling voltage divider resistor R3 connected in series.

[0063] The inverting input of the first operational amplifier U1 is connected between the first sampling voltage divider resistor R2 and the second sampling voltage divider resistor R3.

[0064] In a preferred embodiment, the current detection circuit 210 and the loop control circuit 221 are integrated into a single integrated circuit chip. Integrating logic circuits using an integrated circuit chip greatly simplifies circuit layout, makes circuit design more flexible, improves product yield, and facilitates equipment miniaturization.

[0065] As one specific implementation method, its structural diagram is as follows: Figure 4 As shown, the output terminal of the loop control circuit 221 is connected to the non-inverting terminal to provide a first reference voltage for the first operational amplifier U1. The output voltage of the power circuit is controlled by controlling the magnitude of the first reference voltage.

[0066] As another specific implementation method, its structural schematic diagram is as follows: Figure 5 As shown, the control circuit 200 also includes a first constant voltage source;

[0067] In this specific embodiment, the first reference voltage is provided by a first constant voltage source, and the output terminal of the loop control circuit 221 and the sampling terminal from the power circuit 100 are connected together to the inverting terminal of the first operational amplifier U1, wherein the sampling terminal from the power circuit 100 and the output terminal of the loop control circuit 221 are combined.

[0068] In this case, the sum of the sampled voltage and the voltage at the output terminal of the loop control circuit 221 is the negative terminal voltage of the operational amplifier U1, while the first reference voltage remains unchanged. Thus, the output voltage of the power circuit 100 can be changed by adjusting the voltage at the output terminal of the loop control circuit 221.

[0069] Another specific implementation method is shown in the following structural diagram: Figure 6 As shown, the loop circuit 222 also includes a second operational amplifier U2, a second feedback resistor R5, a second feedback capacitor C2, a first diode D1, and a second diode D2;

[0070] The second feedback capacitor C2 and the second feedback resistor R5 are connected in series between the output terminal and the inverting terminal of the second operational amplifier U2;

[0071] The non-inverting input of the second operational amplifier U2 receives the second reference voltage;

[0072] The inverting input of the second operational amplifier U2 receives the supply current from the power circuit 100;

[0073] The negative terminal of the second diode D2 is connected to the power circuit 100, and the positive terminal is connected to the output terminal of the second operational amplifier U2;

[0074] The negative terminal of the first diode D1 is connected to the power circuit 100, and the negative terminal is connected to the output terminal of the first operational amplifier U1.

[0075] Please refer to Figure 6 The first operational amplifier U1 and its connected components form a voltage loop, while the second operational amplifier U2 and its connected components form a current loop. The current loop and voltage loop compete with each other. When the power circuit 100 is under load and in constant current output mode, the current loop operates faster than the voltage loop. Therefore, during normal operation, the second diode D2 is in the conducting state, and the first diode D1 is in the cutoff state. At this time, the control signal of the current loop is used to control the output current of the drive power supply. The current loop is closed, while the voltage loop is open, limiting the maximum voltage. During normal operation, the first reference voltage provided by the loop control circuit 221 can be set to be greater than or equal to the voltage signal acquired by the inverting input of the first operational amplifier U1 during constant current operation. In this case, the voltage loop effectively limits the voltage from exceeding the maximum limit, preventing serious consequences such as device damage caused by malfunctions or other accidents. When the load is damaged or no load is installed, the output current of the power circuit 100 is 0, and the current loop is open. At this time, the current detection circuit 210 determines that the driving power supply is in an unloaded state. The voltage loop is closed under the control of the loop control circuit 221. The loop control circuit 221 outputs the first reference voltage V1 corresponding to the first voltage, controlling the voltage of the power circuit 100 to drop to the first voltage. After the load is changed, once the driving power supply outputs current, the current detection circuit 210 detects the current and determines that the power circuit 100 is in a loaded state. The loop control circuit 221 changes the first reference voltage of the voltage loop to the first reference voltage V2 corresponding to the second voltage. At this time, since the speed of the current loop is greater than that of the voltage loop, the current loop closes quickly, causing the power circuit 100 to return to the constant current output mode.

[0076] Preferably, the first voltage is 0.80 to 0.95 times the second voltage, including endpoint values ​​such as any one of 0.800, 0.913, or 0.950.

[0077] Specifically, due to the characteristics of different loads, if the output voltage of the power circuit 100 is greater than the rated voltage of the load at the moment of partial load switching, circuit overshoot will occur at the moment of switching, affecting the load's lifespan. If the open-circuit voltage of the power circuit 100 is slightly less than the rated voltage of the load, for example, 90% of the rated voltage, a small current will be generated at the moment of switching, but this current is less than the rated current of the load and will not affect its lifespan. This will trigger the loop circuit 222 and the current detection circuit 210, allowing for normal startup. However, if the voltage of the power circuit 100 at the moment of switching is much less than the rated voltage of the load, such as 50% of the LED's rated voltage, there will be no current or the current will be too small at the moment of switching, preventing the loop circuit 222 and the current detection circuit 210 from triggering and thus preventing normal startup.

[0078] Preferably, the first reference voltage is Vref1 under load and Vref2 under no-load, wherein Vref2 is less than Vref1. When the power circuit 100 switches between no-load and load states, the first reference voltage value switches directly between Vref1 and Vref2, that is, only the values ​​of Vref1 and Vref2 appear during the switching.

[0079] In another scenario, the first reference voltage value can change when it switches directly between Vref1 and Vref2. That is, when switching from no-load to load, the Vref value changes from Vref2 to Vref3, and then from Vref3 back to Vref1, achieving a step change in the Vref value.

[0080] in addition, Figure 6 For ease of illustration, the sampling circuits of the two operational amplifiers on the power circuit 100 are not shown, that is, how the inverting terminals of the two operational amplifiers are connected between the power circuit 100 and the load is not shown. The sampling points are only indicated by the subtitles Vc and Ic. For details, please refer to the previous text and existing technology.

[0081] The driving power supply provided by the present invention includes a control circuit 200 and a power circuit 100; the power circuit 100 is used to supply power to a load; the control circuit 200 includes a current detection circuit 210 and a response circuit 220; the current detection circuit 210 is used to detect the supply current of the power circuit 100 to the load, and determine whether the power circuit 100 is unloaded based on the supply current; the response circuit 220 is used to adjust the output voltage of the power circuit 100 to a first voltage when the power circuit 100 is unloaded; and to adjust the output voltage of the power circuit 100 to a second voltage when the power circuit 100 is loaded; the first voltage is less than the second voltage. This invention monitors the power supply current of the power circuit 100 to the load through the control circuit 200. When the load fails or is unloaded, the circuit between the power circuit 100 and the load is open, and the current is zero. At this time, the power circuit 100 is determined to be in an unloaded state. The control circuit 200 lowers the output voltage of the power circuit 100 to the first voltage. This can prevent the load from being damaged by an excessive surge current caused by the sudden connection of the load to the power circuit 100 when the load is reconnected. When the output voltage of the power circuit 100 is the first voltage in the unloaded state, a small current will appear at the moment of connection when the power circuit 100 is connected to a new load. This current is detected by the control circuit 200, and the voltage of the power circuit 100 is adjusted back to the second voltage to complete the hot-plugging process.

[0082] The present invention also provides a drive power supply control method, the flowchart of one specific embodiment of which is shown below. Figure 7 As shown, it includes:

[0083] S101: Obtain the power supply current of the power circuit 100 from the current detection circuit 210.

[0084] S102: Determine whether the power circuit 100 is unloaded based on the power supply current.

[0085] As a preferred embodiment, this step specifically includes:

[0086] A1: Determine whether the power supply current exceeds the operating current threshold.

[0087] A2: When the supply current exceeds the operating current threshold, the power circuit 100 is determined to be under load; when the supply current does not exceed the operating current threshold, the power circuit 100 is determined to be unloaded.

[0088] It is not necessary to wait until the current in the circuit is completely zero before determining whether the load has been removed. After setting the action current threshold, it can not only be used to detect hot-plugging, but also to detect some faults in the circuit, such as the current reduction caused by load failure. If a high voltage level is maintained at this time, it will undoubtedly increase the safety risk. At this time, the output voltage of the power circuit 100 can be reduced. In other scenarios, even if the load is removed, a small instantaneous current may still be generated in the circuit. Setting the action current threshold can avoid misjudging this situation as a load reconnection, further ensuring safety.

[0089] Furthermore, the minimum current value is 0.01 to 0.05 times the current value of the power circuit 100 under load operation, including endpoint values ​​such as any one of 0.010 times, 0.032 times, or 0.050 times.

[0090] S103: When the power circuit 100 is unloaded, the output voltage of the power circuit 100 is reduced to a first voltage; when the power circuit 100 is loaded, the output voltage of the power circuit 100 is adjusted to a second voltage; the first voltage is less than the second voltage.

[0091] The drive power control method mentioned in this specific embodiment corresponds to the drive power mentioned above. It is a method for controlling the drive power. Therefore, specific technical details can be found in the previous text and will not be repeated in this specific embodiment.

[0092] In a preferred embodiment, step S102 includes:

[0093] B1: Obtain the rate of change of the power supply current within a preset time interval through the power supply current.

[0094] B2: Determine the relationship between the rate of change of the power supply current and the preset first change threshold and second change threshold; wherein the first change threshold is a positive value and the second change threshold is a negative value.

[0095] B3: When the rate of change of the power supply current is greater than the first change threshold, the power circuit 100 is determined to be under load; when the rate of change of the power supply current is less than the second change threshold, the power circuit 100 is determined to be unloaded.

[0096] In this preferred embodiment, the determination of whether the power circuit 100 is unloaded is no longer based on the current value at a certain instant, but rather on the rate of change of current over a period of time. For some loads with multiple power levels or those that change power, the current often varies within a large range. Especially when the load has a standby-like operating mode, there may be a situation where the standby current is too small and is mistakenly judged as unloaded by the control circuit 200. Using the rate of change of current to determine whether it is unloaded can greatly improve the accuracy of unload determination and expand the applicability of the drive power supply.

[0097] Preferably, the process of adjusting the output voltage of the power circuit 100 to the first voltage or the second voltage is a step adjustment. That is, when the first reference voltage value directly switches between Vref1 and Vref2, a change can occur. Specifically, when switching from no-load to load, the Vref value switches from Vref2 to Vref3, and then from Vref3 to Vref1, achieving a step change in the Vref value.

[0098] The drive power supply control method provided by the present invention includes obtaining the supply current of the power circuit 100 from the current detection circuit 210; determining whether the power circuit 100 is unloaded based on the supply current; when the power circuit 100 is unloaded, reducing the output voltage of the power circuit 100 to a first voltage; when the power circuit 100 is loaded, adjusting the output voltage of the power circuit 100 to a second voltage; the first voltage is less than the second voltage. This invention monitors the power supply current of the power circuit 100 to the load through the control circuit 200. When the circuit between the power circuit 100 and the load is open, there is naturally no current. At this time, the power circuit 100 is determined to be in an unloaded state. The control circuit 200 lowers the output voltage of the power circuit 100 to the first voltage. This can prevent the load from being damaged by an excessively high surge current caused by the sudden connection of the load to the power circuit 100 when the load is reconnected. When a new load is connected to the power circuit 100 in the unloaded state, the circuit between the power circuit 100 and the load is closed. The low operating voltage will provide a small current, which is detected by the control circuit 200. The voltage of the power circuit 100 is then adjusted back to the second voltage to complete the hot-plugging process.

[0099] The following describes the drive power control device provided in the embodiments of the present invention. The drive power control device described below can be referred to in correspondence with the drive power control method described above.

[0100] Figure 8 This is a structural block diagram of the drive power control device provided in an embodiment of the present invention, with reference to... Figure 8 The drive power supply control device may include:

[0101] The acquisition module 001 is used to acquire the supply current of the power circuit 100 from the current detection circuit 210;

[0102] The judgment module 002 is used to determine whether the power circuit 100 is unloaded based on the supply current.

[0103] Action module 003 is used to reduce the output voltage of the power circuit 100 to a first voltage when the power circuit 100 is unloaded; and to adjust the output voltage of the power circuit 100 to a second voltage when the power circuit 100 is under load; the first voltage is less than the second voltage.

[0104] In a preferred embodiment, the determination module 002 includes:

[0105] An action determination unit is used to determine whether the power supply current exceeds the action current threshold.

[0106] An operation status determination unit is used to determine that the power circuit 100 is under load when the supply current exceeds the operation current threshold, and to determine that the power circuit 100 is unloaded when the supply current does not exceed the operation current threshold.

[0107] In a preferred embodiment, the determination module 002 includes:

[0108] A rate acquisition unit is used to acquire the rate of change of the power supply current within a preset time interval through the power supply current.

[0109] A rate determination unit is used to determine the relationship between the rate of change of the power supply current and a preset first change threshold and a second change threshold; wherein the first change threshold is a positive value and the second change threshold is a negative value;

[0110] The rate determination unit is used to determine that the power circuit 100 is under load when the rate of change of the power supply current is greater than the first change threshold, and to determine that the power circuit 100 is unloaded when the rate of change of the power supply current is less than the second change threshold.

[0111] The drive power supply control device provided by the present invention includes an acquisition module 001 for acquiring the supply current of the power circuit 100 from the current detection circuit 210; a judgment module 002 for judging whether the power circuit 100 is unloaded based on the supply current; and an action module 003 for reducing the output voltage of the power circuit 100 to a first voltage when the power circuit 100 is unloaded, and adjusting the output voltage of the power circuit 100 to a second voltage when the power circuit 100 is loaded; wherein the first voltage is less than the second voltage. This invention monitors the power supply current of the power circuit 100 to the load through the control circuit 200. When the circuit between the power circuit 100 and the load is open, there is naturally no current. At this time, the power circuit 100 is determined to be in an unloaded state. The control circuit 200 lowers the output voltage of the power circuit 100 to the first voltage. This can prevent the load from being damaged by an excessively high surge current caused by the sudden connection of the load to the power circuit 100 when the load is reconnected. When a new load is connected to the power circuit 100 in the unloaded state, the circuit between the power circuit 100 and the load is closed. The low operating voltage will provide a small current, which is detected by the control circuit 200. The voltage of the power circuit 100 is then adjusted back to the second voltage to complete the hot-plugging process.

[0112] The drive power control device of this embodiment is used to implement the aforementioned drive power control method. Therefore, the specific implementation of the drive power control device can be found in the embodiment section of the drive power control method above. For example, the acquisition module 001, the judgment module 002, and the action module 003 are used to implement steps S101, S102, and S103 in the above drive power control method, respectively. Therefore, the specific implementation can be referred to the description of the corresponding embodiments, which will not be repeated here.

[0113] The present invention also provides a drive power supply control device, comprising:

[0114] Memory, used to store computer programs;

[0115] A processor is configured to execute the computer program to implement the steps of the drive power supply control method as described above. The drive power supply control method provided by this invention includes obtaining the supply current of the power circuit 100 from the current detection circuit 210; determining whether the power circuit 100 is unloaded based on the supply current; when the power circuit 100 is unloaded, reducing the output voltage of the power circuit 100 to a first voltage; when the power circuit 100 is loaded, adjusting the output voltage of the power circuit 100 to a second voltage; wherein the first voltage is less than the second voltage. This invention monitors the power supply current of the power circuit 100 to the load through the control circuit 200. When the circuit between the power circuit 100 and the load is open, there is naturally no current. At this time, the power circuit 100 is determined to be in an unloaded state. The control circuit 200 lowers the output voltage of the power circuit 100 to the first voltage. This can prevent the load from being damaged by an excessively high surge current caused by the sudden connection of the load to the power circuit 100 when the load is reconnected. When a new load is connected to the power circuit 100 in the unloaded state, the circuit between the power circuit 100 and the load is closed. The low operating voltage will provide a small current, which is detected by the control circuit 200. The voltage of the power circuit 100 is then adjusted back to the second voltage to complete the hot-plugging process.

[0116] A computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the drive power supply control method as described above. The drive power supply control method provided by this invention includes: obtaining the supply current of a power circuit 100 from a current detection circuit 210; determining whether the power circuit 100 is unloaded based on the supply current; when the power circuit 100 is unloaded, reducing the output voltage of the power circuit 100 to a first voltage; when the power circuit 100 is loaded, adjusting the output voltage of the power circuit 100 to a second voltage; wherein the first voltage is less than the second voltage. This invention monitors the power supply current of the power circuit 100 to the load through the control circuit 200. When the circuit between the power circuit 100 and the load is open, there is naturally no current. At this time, the power circuit 100 is determined to be in an unloaded state. The control circuit 200 lowers the output voltage of the power circuit 100 to the first voltage. This can prevent the load from being damaged by an excessively high surge current caused by the sudden connection of the load to the power circuit 100 when the load is reconnected. When a new load is connected to the power circuit 100 in the unloaded state, the circuit between the power circuit 100 and the load is closed. The low operating voltage will provide a small current, which is detected by the control circuit 200. The voltage of the power circuit 100 is then adjusted back to the second voltage to complete the hot-plugging process.

[0117] The various embodiments in this 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.

[0118] It should 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.

[0119] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0120] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0121] The driving power supply and its control method provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A driving power source characterized by comprising: The control circuit and the power circuit are included; The power circuit is used to supply power to the load; The control circuit includes a current detection circuit and a reaction circuit; The current detection circuit is used to detect the supply current of the power circuit to the load, and determine whether the power circuit is idle according to the supply current; The reaction circuit is used to adjust the output voltage of the power circuit to a first voltage when the power circuit is idle, and adjust the output voltage of the power circuit to a second voltage when the power circuit is loaded; The first voltage is less than the second voltage; The maximum value of the first voltage is 0.80 to 0.95 times the maximum value of the second voltage, including the end value.

2. The driving power supply according to claim 1, wherein The reaction circuit includes a loop control circuit and a loop circuit; The loop control circuit outputs a feedback signal to the loop circuit according to the working state of the power circuit determined by the current detection circuit; The loop circuit sends a control signal to the power circuit according to the feedback signal, so that the power circuit adjusts the output voltage according to the control signal.

3. The driving power supply according to claim 2, wherein The loop circuit includes a first operational amplifier, a first feedback resistor and a first feedback capacitor; The first feedback capacitor and the first feedback resistor are connected in series between the output terminal and the inverting terminal of the first operational amplifier; The non-inverting terminal of the first operational amplifier receives a first reference voltage; The inverting terminal collects a voltage signal from the power circuit; The output terminal is connected with the power circuit; The output terminal of the loop control circuit is connected to the non-inverting terminal of the first operational amplifier, which is used to provide the first reference voltage of the first operational amplifier.

4. The driving power supply according to claim 2, wherein The loop circuit includes a first operational amplifier, a first feedback resistor and a first feedback capacitor; The first feedback capacitor and the first feedback resistor are connected in series between the output terminal and the inverting terminal of the first operational amplifier; The non-inverting terminal of the first operational amplifier receives a first reference voltage; The inverting terminal collects a voltage signal from the power circuit; The output terminal is connected with the power circuit; The output terminal of the loop control unit is connected to the inverting terminal of the first operational amplifier.

5. The driving power supply according to claim 2, wherein The current detection circuit and the loop control circuit are integrated in one integrated circuit chip.

6. A drive power source control method characterized by, It includes: Obtaining the supply current of the power circuit from the current detection circuit; Determine whether the power circuit is idle according to the supply current; When the power circuit is idle, the output voltage of the power circuit is reduced to a first voltage; when the power circuit is loaded, the output voltage of the power circuit is adjusted to a second voltage; the first voltage is less than the second voltage; The maximum value of the first voltage is 0.80 to 0.95 times the maximum value of the second voltage, including the end value.

7. The driving power source control method according to claim 6, wherein The determination of whether the power circuit is idle according to the supply current includes: Determine whether the supply current exceeds the action current threshold; When the supply current exceeds the action current threshold, it is determined that the power circuit is loaded; when the supply current does not exceed the action current threshold, it is determined that the power circuit is idle.

8. The driving power supply control method according to Claim 6, wherein The determination of whether the power circuit is idle according to the supply current includes: The power supply current is used to obtain a power supply current change rate in a preset time interval; The power supply current change rate is compared with preset first and second change thresholds; the first change threshold is positive, and the second change threshold is negative; When the power supply current change rate is greater than the first change threshold, it is determined that the power circuit is loaded; when the power supply current change rate is less than the second change threshold, it is determined that the power circuit is unloaded.

9. The driving power supply control method according to Claim 6, wherein The process of adjusting the output voltage of the power circuit to the first voltage or the second voltage is stepwise adjustment.

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