A method and device for quickly starting up a power supply and stably entering and exiting the standby state

Abstract

The present invention relates to a method and device for quickly starting up a power supply and stably entering and exiting the standby state. The method utilizes a primary controller and a secondary controller with a standby mode, and realizes rapid and consistent startup and quick entry into and exit from the standby process by programming algorithms according to the characteristics of different loads and designing corresponding hardware, so as to achieve the purpose of minimizing standby power consumption, shortening the response time, and improving the consistency of startup time. Compared with the prior art, the present invention has the advantages of stable and reliable startup and quick entry into and exit from the standby state, thus helping to improve the startup consistency, shortening the startup and entry / exit standby time, and reducing the standby power consumption.

Description

Technical Field

[0001] The present invention relates to an LED power supply, and more particularly to a method and device for rapid startup of the power supply and stable entry into and exit from standby. Background Art

[0002] With the continuous development of technology, the market has put forward higher and more detailed requirements for LED power supplies, especially in the high-end market. The standby power consumption is set towards the goal of 0.2W; and it is required that the system responds faster, and the fast and consistent startup time and response time have also been included in the DALI 2.0 standard, which requires that standby wake-up is a very rapid and stable process. In addition, in actual application scenarios, all the lights do not light up simultaneously when powered on, causing the so-called popcorn phenomenon, which greatly reduces people's visual experience.

[0003] In order to achieve 0.2W standby, a separate AC / DC standby power supply can be added, but this will increase the cost and volume. If the standby power supply is not added, it is usually required that Vbus enters the low-voltage mode in standby to maintain the system's continuous operation. In this way, the loss of the resistive loss components at the rear stage will be reduced by the square of the voltage reduction multiple, and the constant-current load will linearly decrease, and other buck converters will also improve efficiency and reduce losses.

[0004] High-performance LED power supplies usually have the following two-stage or three-stage structures. The front stage is either a single-stage AC / DC conversion with PF correction function or a two-stage conversion (such as PF correction plus DC / DC) to obtain an appropriate Vbus voltage to provide direct current for the rear-stage constant-current or constant-voltage LED drive, as Figure 1 shown. High-performance power supplies usually already have a programmable control unit for control, as Figure 2 shown. For intelligent power supplies with a control chip, the control chip itself also needs to be powered. This power supply usually uses an additional secondary winding to save costs, and sometimes it is also provided by Vbus through DC / DC. Currently, most high-end LED drivers have isolated outputs. Taking a two-stage circuit with an isolated output as an example to illustrate the present invention, non-isolated circuits and multi-stage circuits are also applicable.

[0005] The topology of the front stage of an isolated two-stage circuit mostly uses a flyback circuit, and isolation is usually achieved by the front stage. In the design of the flyback inductor, there are usually 4 or 3 groups of coils. On the primary side, there is a main winding Lp1 and a winding Lp2 for powering the flyback chip and the control circuit; on the secondary side, there is a main winding Ls1 for powering the load Vbus and a winding Ls2 for powering the control Vctrl. For intelligent control, there is also an intelligent control chip on the secondary side powered by Vctrl. As Figure 2 shown. Some designs use Vbus to provide power for the control circuit and the chip.

[0006] Due to the increasingly lower standby power consumption requirements, the main circuit on the secondary side is required to reduce the voltage in the standby state without the main circuit load to ensure the goal is achieved. To change the Vbus voltage, the existing method is to simply directly change the voltage set point, such as Figure 2 the switching control scheme shown, raising and lowering Vbus by turning on and off S1 (where S1 is any controllable electronic switch) will cause the following problems:

[0007] 1) During the process of entering standby, since the main circuit in the standby state has almost no load consumption, immediately changing the set voltage, such as from Vbus to 1 / n Vbus, such as 1 / 2, the AC / DC control chip will enter the deep burst mode and be in an almost non-switching state. As a result, the control power supplies on the primary and secondary sides may be depleted, and using a large-capacity primary Vcc capacitor C1 will cause problems such as long startup time and long startup time for rapid repeated switching on and off. When the primary power supply Vcc is lower than a certain voltage, such as the UVLO threshold, the chip will wait until Vcc discharges to another threshold, such as Vcc Start, and then restart. Since there is no switching action, Vcc drops slowly. If the system requires driving the lighting at this time, Vbus will quickly drop to an energy level that cannot maintain the load, and the front-end control chip has not started to act yet, then it will be seen that the light will flash and then go out, and the subsequent response is very slow.

[0008] 2) For the single-stage PFC flyback circuit, in order to ensure the quality of PF / THD, the control loop design requires a slow response speed. When suddenly turning on S1 during standby, negative overshoot is likely to cause misoperation of the circuit. At this time, usually a compromise is made on the standby voltage, that is, raising the standby voltage, and the lowest power consumption cannot be achieved. Figure 3 The startup process and the process of entering and exiting standby of the existing scheme are given.

[0009] 3) Conversely, when suddenly closing S1 when exiting standby, it will cause overshoot of Vbus. This positive overshoot causes an increase in the cost of component selection, an increase in volume, misjudgment of overvoltage in the system, and possible flashing of the LED load. Most importantly, it will still further reduce the response time of the system as described in 1);

[0010] 4) In addition, Vbus will also have overshoot during startup. If DC / DC is turned on to supply power to the LED during the overshoot process, flashing will be seen. If lighting is done after detecting that Vbus is stable, the lighting time will be inconsistent due to the inconsistency of product components, and the so-called popcorn phenomenon will be seen. Even worse, the possible Vbus overshoot during startup may cause insufficient power supply to the primary control chip Vcc and lead to restart, thus further lengthening the startup time of some power supplies and exacerbating the difference in startup time. Summary of the Invention

[0011] The object of the present invention is to overcome the defects of the above-mentioned prior art and provide a method and device for rapid startup of a power supply and stable entry into and exit from the standby state, which shortens the startup time and the time for entering and exiting the standby state and reduces the standby power consumption.

[0012] The object of the present invention can be achieved by the following technical solutions:

[0013] A method for rapid startup of a power supply and stable entry into and exit from the standby state, which uses a primary controller and a secondary controller with a standby mode, and realizes rapid and consistent startup and rapid entry into and exit from the standby process by programming an algorithm according to the characteristics of different loads and designing corresponding hardware, so as to achieve the purpose of the lowest standby power consumption, shortening the response time and improving the startup time consistency.

[0014] Preferably, the method specifically includes the following steps:

[0015] 1) Initialization;

[0016] 2) Configuration of parameters;

[0017] 3) Monitoring the bus voltage Vbus and guiding the rise of Vbus by changing the PWM or DAC signal according to a set curve;

[0018] 4) Judging whether to enter or exit the standby state. If yes, execute step 5); otherwise, execute step 10);

[0019] 5) Judging whether to enter the standby state. If yes, execute step 6); otherwise, execute step 8);

[0020] 6) Setting the bus voltage to the standby voltage and executing step 7);

[0021] 7) Monitoring the bus voltage Vbus and guiding the fall of Vbus by changing the PWM or DAC signal according to a set first curve, and executing step 10);

[0022] 8) Setting the bus voltage to the rated working voltage and executing step 9);

[0023] 9) Monitoring the bus voltage Vbus and guiding the rise of Vbus by changing the PWM or DAC signal according to a set second curve, and executing step 10);

[0024] 10) Returning to step 4).

[0025] Preferably, the set first curve in step 7) satisfies maintaining the primary oscillation to meet the requirements of the primary and secondary sides for the control power supply, and should be able to quickly enter the standby state; the first curve adopts a multi-segment linear control curve or other multi-segment or single-function control curves.

[0026] Preferably, different first curves are adopted for different loads, specifically as follows:

[0027] a) For a resistive load, the natural decline curve of Vbus is an exponential curve: Vbus(t) = Vbus0 * exp(-t / (RC));

[0028] b) For a constant-current load, Vbus(t) = Vbus0 - I / C * t;

[0029] c) For a constant-power load,

[0030] where P is the load power, I is the load current, R is the load resistance, C is the total secondary capacitance, and Vbus0 is the initial voltage of Vbus before standby.

[0031] Preferably, the set second curve in step 9) adopts a multi-segment linear control curve or other multi-segment or single-function control curves. In the multi-segment linear control curve, the rising slope is relatively high in the starting segment and relatively low in the final segment.

[0032] An apparatus for the method of quickly starting up the power supply and stably entering and exiting standby includes Vbus, Vref, resistor Ra, resistor Rb, capacitor Ca, a controller, and a conversion circuit. The Vbus, resistor Ra, and resistor Rb are connected in series in sequence. One end of the capacitor Ca is connected to Vbus, and the other end is grounded. The Vref is connected between resistor Ra and resistor Rb. One end of the conversion circuit is connected between resistor Ra and resistor Rb, and the other end is connected to the controller. Here, Vref refers to the connection point of the feedback signal of the feedback regulator.

[0033] Preferably, the controller is connected to the conversion circuit through a DAC interface.

[0034] Preferably, the apparatus further includes a resistor Rc connected between resistor Ra and resistor Rb;

[0035] The Vref is connected between resistor Ra and resistor Rc, and the conversion circuit is connected between resistor Rb and resistor Rc; or the conversion circuit is connected between resistor Ra and resistor Rc, and the Vref is connected between resistor Rb and resistor Rc.

[0036] Preferably, the controller is connected to the conversion circuit through an I / O port or a PWM port.

[0037] Preferably, the conversion circuit includes a resistor Rd and a filter. One end of the resistor Rd is connected between resistor Ra and resistor Rb, and the other end is connected to the controller through the filter.

[0038] Compared with the prior art, the present invention has the following advantages:

[0039] 1) In view of the dynamic problems that occur in the design process of high-performance intelligent LED power supplies to meet the requirements of low standby power consumption, fast load response, and startup time consistency, the present invention adopts a method combining hardware and software to provide a low-cost solution.

[0040] 2) The present invention is applicable to ACDC power supplies with two or more stages of circuits, and is not limited to LED power supplies. The method used in the present invention is also applicable to static setting of the Bus voltage and Bus jump control according to different loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a schematic diagram of the general topology of an existing high-performance LED power supply;

[0042] Figure 2 is a schematic diagram of an existing standby control circuit;

[0043] Figure 3 is a schematic diagram of the startup, entry, and exit standby processes of an existing standby control circuit;

[0044] Figure 4 is a schematic diagram of Scheme 1 for the controller to affect the feedback circuit through the analog port;

[0045] Figure 5 is a schematic diagram of an implementation method of Scheme 1 for the controller to affect the feedback circuit through the analog port;

[0046] Figure 6 is a schematic diagram of another implementation method of Scheme 1 for the controller to affect the feedback circuit through the analog port;

[0047] Figure 7 is a schematic diagram of Scheme 2 for the controller to affect the feedback circuit through the analog port;

[0048] Figure 8 is a schematic diagram of an implementation method of Scheme 2 for the controller to affect the feedback circuit through the analog port;

[0049] Figure 9 is a schematic diagram of Scheme 3 for the controller to affect the feedback circuit through the analog port;

[0050] Figure 10 is a schematic diagram of Scheme 1 for the controller to affect the feedback circuit by sending PWM signals through the I / O port or PWM port;

[0051] Figure 11 is a schematic diagram of an implementation method of Scheme 1 for the controller to affect the feedback circuit by sending PWM signals through the I / O port or PWM port;

[0052] Figure 12Schematic diagram of the Vbus buck curve under a resistive load;

[0053] Figure 13 Schematic diagram of the Vbus buck curve under a constant - current load;

[0054] Figure 14 Schematic diagram of the Vbus buck curve under a constant - power load;

[0055] Figure 15 Schematic diagram of two - segment linear curves entering standby under a resistive load;

[0056] Figure 16 Schematic diagram of a single - segment exponential curve entering standby under a resistive load;

[0057] Figure 17 Control flow chart of the present invention;

[0058] Figure 18 Schematic diagram of the Vbus curve obtained by applying the exponential control of this patent. Detailed implementation manners

[0059] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0060] As Figure 4-11 shown, a device for rapid startup of a power supply and stable entry into and exit from standby includes Vbus, Vref, resistor Ra, resistor Rb, capacitor Ca, a controller, and a conversion circuit. The Vbus, resistor Ra, and resistor Rb are connected in series in sequence. One end of the capacitor Ca is connected to Vbus, and the other end is grounded. The Vref is connected between resistor Ra and resistor Rb. One end of the conversion circuit is connected between resistor Ra and resistor Rb, and the other end is connected to the controller.

[0061] As Figure 4 shown, the controller is connected to the conversion circuit through a DAC interface.

[0062] As Figure 5 shown, the conversion circuit is resistor Rd.

[0063] As Figure 6 shown, the resistor Rd is connected to the controller through diode Da. The positive electrode of the diode Da is connected to the resistor Rd, and the negative electrode is connected to the controller.

[0064] As Figure 7 and9 As shown, the device further includes a resistor Rc connected between resistor Ra and resistor Rb;

[0065] The Vref is connected between resistor Ra and resistor Rc, and the conversion circuit is connected between resistor Rb and resistor Rc; or the conversion circuit is connected between resistor Ra and resistor Rc, and the Vref is connected between resistor Rb and resistor Rc.

[0066] As Figure 8 shown, the conversion circuit includes a triode and a resistor Rd, wherein the base of the triode is connected to the controller, the emitter is grounded, and the collector is connected between resistor Ra and resistor Rc through resistor Rd.

[0067] As Figure 10-11 shown, the controller is connected to the conversion circuit through an I / O port or a PWM port.

[0068] As Figure 10 shown, the conversion circuit includes a resistor Rd and a filter, one end of the resistor Rd is connected between resistor Ra and resistor Rb, and the other end is connected to the controller through the filter.

[0069] As Figure 11 shown, the conversion circuit includes a resistor Rd, a resistor Re and a capacitor Cb, one end of the resistor Rd is connected between resistor Ra and resistor Rb, the other end is connected to the controller through the resistor Re, and one end of the capacitor Cb is connected between the resistor Rd and the resistor Re, and the other end is grounded.

[0070] Figures 4 to 9 An analog implementation is given. The DAC output in the analog implementation can be replaced by a PWM scheme plus a conversion circuit such as a filter. Figures 10 to 11 A PWM implementation is given. Where Ra to Rc are Vbus sampling resistors, similar to Figure 2 the functions of R15 and R16 in, and Vref is connected to the feedback input point of the feedback control.

[0071] In the analog control scheme, the programmable controller adds a signal to the feedback circuit input point Vref through an analog output port via a conversion line, as Figure 4 shown, or to any point on the sampling resistor string, for example Figure 7 Figure 9 shown. Figure 5 is Figure 4A specific implementation of the solution. When the controller is not powered on, such as during the takeoff process, the DAC port is in a high-impedance state, and the voltage of Vbus is determined by Ra and Rb, where Vbus = Vref * (Ra + Rb) / Rb. When the DAC output is less than the Vref target value, the voltage of Vbus will rise, being higher than the voltage determined solely by the voltage division of Ra and Rb, and vice versa. If only unidirectional control is required in the control strategy, diodes can be added to the DAC network. As Figure 6 shown. At this time, the controller can only increase Vbus. The low voltage of Vbus is determined by Ra, Rb, and Vref and is not affected by the controller, which is suitable for occasions with high requirements for low-voltage accuracy.

[0072] The conversion circuit itself can also be implemented by various linear circuits such as operational amplifiers and transistors. As Figure 8 shows another conversion circuit using a triode, which can be used when precise control of the Vbus conversion curve or set point is not required. Using an operational amplifier allows for precise setting of Vbus. Additionally, the conversion circuit can be omitted. In the absence of a conversion circuit, Ra to Rc act alone as voltage dividers when the controller is not powered on or the output is in a high-impedance state. For example, when the controller is in the standby state, the DAC pin can be set to open-drain, so the DAC output is in a high-impedance state. Once the controller is powered on and configured as a DAC port, the control loop is taken over by the controller.

[0073] Figure 10 and Figure 11 shows the PWM solution. General IO ports or PWM channel ports can be used. The programmable controller issues a PWM signal, which is filtered through a filter and then connected to the feedback loop for control. The configuration of the port can be open-drain or push-pull. When configured as open-drain, the controller's influence on Vbus is only to make it higher than the voltage determined by Ra and Rb. When configured as push-pull, it can be higher or lower than this value. When the duty cycle is 0, the PWM port is equivalent to a short circuit to ground, and Rb and Rd are in parallel and then form a voltage division circuit with Ra, resulting in the highest voltage. When the duty cycle is 100%, for open-drain, it is like a high impedance, and Vbus is determined by the voltage division of Ra and Rb, with the lowest voltage. For push-pull, it is equivalent to the Vcc voltage of the controller being applied to the right end of Rd, and its influence on Vbus is like DAC control. When the duty cycle is between 0 and 1, its average output voltage, that is, the product of the duty cycle and the Vcc level, together with Ra, Rb, and Rd, determines Vbus, similar to analog control.

[0074] The firmware and hardware of the present invention cooperate to implement the soft start and the process of entering and exiting standby, which is described as follows:

[0075] Control strategy for the startup process:

[0076] 1. After the AC power is applied, Vbus rises under the control of the primary control chip and the hardware feedback loop, and can only rise up to the voltage Vs determined by Ra to Rc at most.

[0077] 2. The secondary programmable controller is powered on and starts to monitor the Vbus voltage. Once the controller detects Vbus, it can perform boot control on Vbus, or when Vbus reaches a specific value Vstctrl and stabilizes for a certain period (this period can be 0), it starts to guide the rise of Vbus with a certain control curve. The curve can be implemented by calculation or look-up table. For Figure 5 example, the DAC drops from the Vref voltage or a specific value, which can be the DAC value corresponding to the current Vbus detection value, to 0V or a set value. For Figure 10 example, for PWM control, the duty cycle drops from 100%, or a specific value, which can be the PWM value corresponding to the currently measured Vbus value, to 0%, or a set value. The control curve can adopt multi-segment linear control, with a higher rising slope in the starting segment and a lower slope in the final segment to achieve a fast and overshoot-free Vbus stabilization process; it can also adopt other multi-segment or single-function control curves, such as exponential curves, trigonometric function curves, etc. Each segment can use different function control curves or the same function curve with different parameters. There can be a stable time to maintain the Vbus value between each segment of control or no such time period, in order to achieve the purpose of stable, rapid and precise control.

[0078] Control strategies for entering and exiting the standby process:

[0079] 1. After the standby condition is met, the secondary controller guides the drop of Vbus with a certain curve. For Figure 5 example, make the DAC go from 0V or a specific value corresponding to the rated voltage to Vref or a set value corresponding to the standby voltage. For Figure 10 example, the PWM duty cycle goes from 0% or a specific value corresponding to the rated operating voltage to 100% or a set value corresponding to the standby voltage. The purpose of this curve is to maintain the switching oscillation of the primary controller to meet the requirements of the primary and secondary sides for the control power supply, and at the same time enter the standby state as fast as possible. Fastness can not only promote energy conservation but also reduce the waiting time required for the standby power consumption during production line testing.

[0080] 2. To prevent undershoot and ensure that the time to enter standby cannot be too long, multi-segment linear control curves or other multi-segment or single-function control curves can still be used. The functions and algorithms used can be programmed according to the load situation. The load may be a resistive load, a constant current load or a constant power load, or a combination of different types. For different loads, the following curves and their combinations and possible segmented combinations can be adopted, but not limited to the recommended curves.

[0081] a) For a resistive load, the natural decay curve of Vbus is an exponential curve: Vbus(t) = Vbus0 * exp(-t / (RC)), see Figure 12 ;

[0082] b) For a constant-current load, Vbus(t) = Vbus0 - I / C * t, see Figure 13 ;

[0083] c) For a constant-power load, see Figure 14 ;

[0084] where P is the load power, I is the load current, R is the load resistance, C is the total secondary capacitance, and Vbus0 is the initial voltage of Vbus before standby.

[0085] Figure 15 A case of two-segment linear control curve entering standby for a resistive load is given.

[0086] Figure 16 A case of single-segment exponential curve entering standby for a resistive load is given.

[0087] It can be seen that when using the exponential curve, the primary control chip always works in an adjustable state and Vcc does not drop at all; when using the two-segment linear control curve, although Vcc drops, it does not enter the UVLO mode, so it can still enter standby well.

[0088] 3. When receiving a dimming command or other requirements to exit standby, Vbus should be quickly raised to the normal working state, and at the same time, lamp flashing caused by overshoot should be prevented. Similarly, a multi-segment linear control curve or other control curves are used to quickly restore Vbus. Taking Figure 5 as an example, the DAC changes from Vref or a set value corresponding to the standby voltage to 0V or a specific value corresponding to the rated voltage, and taking Figure 10 as an example, the PWM duty cycle changes from 100% or a set value corresponding to the standby voltage to 0% or a specific value corresponding to the rated working voltage. The purpose of this curve is to enable the control system to quickly and smoothly control Vbus to reach the rated working voltage.

[0089] As Figure 17 shown, a method for a device for fast startup and stable entry and exit from standby of the power supply as described above includes the following steps:

[0090] 1) Initialization and parameter configuration;

[0091] 2) Enter the startup state, monitor Vbus and change the PWM or DAC signal according to the set curve to guide Vbus to rise to the desired voltage;

[0092] 4) Determine whether to enter or exit the standby state. If yes, execute step 5); otherwise, execute step 10).

[0093] 5) Determine whether to enter the standby state. If yes, execute step 6); otherwise, execute step 8).

[0094] 6) Set the bus voltage to the minimum voltage, set the bus voltage to the standby voltage, and execute step 7).

[0095] 7) Monitor Vbus and change the PWM or DAC signal according to the set curve to guide Vbus to drop to the standby voltage. The PWM duty cycle changes from 0% to 100% according to the set curve, or the DAC changes from 0V to Vref according to the set curve.

[0096] 8) Set the bus voltage to the rated voltage, set the bus voltage to the rated operating voltage, and execute step 9).

[0097] 9) The PWM duty cycle changes from 100% to 0% according to the set curve, or the DAC changes from Vref to 0V according to the set curve. Monitor Vbus and change the PWM or DAC signal according to the set curve to guide Vbus to rise.

[0098] 10) Set the bus voltage to the rated voltage and execute step 11); execute other processes, and then go to step 4).

[0099] 11) The PWM duty cycle changes from 100% to 0% according to the set curve, or the DAC changes from Vref to 0V according to the set curve.

[0100] Through the above method, the startup time of the original design is reduced from the range of 350mS to 760mS to between 350mS and 380mS. The standby power consumption is stabilized from the original range of 0.32W to 0.9W to the range of 0.32W to 0.38W. There is no longer any lamp flashing during standby recovery, and the standby recovery time has passed the inspection of the DALI tester.

[0101] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A method for quickly starting up a power supply and stably entering and exiting the standby state, characterized in that, This method utilizes a primary - side controller with a standby mode and a secondary - side controller. By programming algorithms according to the characteristics of different loads and designing corresponding hardware, it achieves rapid and consistent startup and quick entry into and exit from the standby process, aiming to minimize standby power consumption, shorten response time, and improve the consistency of startup time. This method specifically includes the following steps: 1) Initialization; 2) Configure parameters; 3) Monitor the bus voltage Vbus and change the PWM or DAC signal according to a set curve to guide Vbus to rise; 4) Determine whether to enter or exit the standby state. If yes, execute step 5); otherwise, execute step 10); 5) Determine whether to enter the standby state. If yes, execute step 6); otherwise, execute step 8); 6) Set the bus voltage to the standby voltage and execute step 7); 7) Monitor the bus voltage Vbus and change the PWM or DAC signal according to a set first curve to guide Vbus to fall, and execute step 10); 8) Set the bus voltage to the rated operating voltage and execute step 9); 9) Monitor the bus voltage Vbus and change the PWM or DAC signal according to a set second curve to guide Vbus to rise, and execute step 10); 10) Return to step 4).

2. A method for quickly starting up a power supply and stably entering and exiting the standby state according to claim 1, characterized in that, The set first curve in step 7) satisfies maintaining the primary - side oscillation to meet the requirements of the primary and secondary sides for the control power supply, and at the same time should be able to quickly enter the standby state. The first curve adopts a multi - segment linear control curve or other multi - segment or single - function control curves.

3. A method for rapid startup of a power supply and stable entry and exit from standby according to claim 2, characterized in that, For different loads, different first curves are adopted, specifically as follows: a) For resistive loads, the natural decline curve of Vbus is an exponential curve: Vbus(t) = Vbus0*exp(-t / (RC)); b) For constant - current loads, Vbus(t) = Vbus0 - I / C*t; c) For constant power loads, where P is the load power, I is the load current, R is the load resistance, C is the total secondary capacitance, and Vbus0 is the initial voltage of Vbus before standby.

4. A method for quickly starting up a power supply and stably entering and exiting the standby state according to claim 1, characterized in that, The set second curve in step 9) adopts a multi - segment linear control curve or other multi - segment or single - function control curves. In the multi - segment linear control curve, the rising slope is relatively high in the starting segment and relatively low in the final segment.

5. An apparatus for the method of quickly starting up and stably entering and exiting standby of the power supply according to claim 1, characterized in that, It includes Vbus, Vref, resistor Ra, resistor Rb, capacitor Ca, a controller, and a conversion circuit. Vbus, resistor Ra, and resistor Rb are connected in series in sequence. One end of capacitor Ca is connected to Vbus, and the other end is grounded. Vref is connected between resistor Ra and resistor Rb. One end of the conversion circuit is connected between resistor Ra and resistor Rb, and the other end is connected to the controller. Here, Vref refers to the connection point of the feedback signal of the feedback regulator.

6. The device according to claim 5, characterized in that The controller is connected to the conversion circuit through a DAC interface.

7. The device according to claim 5, characterized in that, The device further includes a resistor Rc connected between resistor Ra and resistor Rb; Vref is connected between resistor Ra and resistor Rc, and the conversion circuit is connected between resistor Rb and resistor Rc; or the conversion circuit is connected between resistor Ra and resistor Rc, and Vref is connected between resistor Rb and resistor Rc.

8. The device according to claim 5, characterized in that, The described controller is connected to the conversion circuit through the I / O port or the PWM port.

9. The device according to claim 5, characterized in that The described conversion circuit includes a resistor Rd and a filter. One end of the resistor Rd is connected between the resistors Ra and Rb, and the other end is connected to the controller through the filter.

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