Machine starting control method, machine starting control circuit and electronic device

Abstract

The application discloses a starting control method, a starting control circuit and electronic equipment. The starting control method comprises the following steps: acquiring a circuit characteristic parameter of a power supply adjusting circuit; obtaining a feedback adjusting pulse width by using the circuit characteristic parameter; gradually increasing one half of a minimum limited frequency pulse width by using a first monotonic function to obtain a limited frequency adjusting pulse width; detecting whether the feedback adjusting pulse width is smaller than the limited frequency adjusting pulse width; if the feedback adjusting pulse width is not smaller than the limited frequency adjusting pulse width, generating a first control signal by using the limited frequency adjusting pulse width; and sending the first control signal to the power supply adjusting circuit to trigger the power supply adjusting circuit to change a switching state. In the foregoing manner, the starting control method can effectively improve the monotonicity of the starting stage of the highest frequency widthening and the frequency after the widthening is completed, so that the starting control method is closer to linear increase, and the phenomenon of output drop is effectively avoided.

Description

Technical Field

[0001] This application relates to the field of circuit control technology, and in particular to a start-up control method, a start-up control circuit, and an electronic device. Background Technology

[0002] In recent years, with the rapid development of various electronic products, especially the advent of the cloud computing and big data era, the use of servers has increased dramatically, placing higher demands on efficient and reliable power supply systems. Among these, efficient and reliable power supply systems often have certain limitations in startup control, such as high starting current and poor monotonicity. The purpose of power supply startup monotonicity is primarily to ensure that the power supply can provide voltage stably and orderly during startup, thereby avoiding system instability or failure caused by voltage fluctuations or drops. During power supply startup, the voltage should maintain a "monotonic climb," meaning the voltage should continuously rise to the set regulated value without any drops. If the power supply cannot provide sufficient output power, the voltage may drop, which will affect the normal startup and operation of the server. Therefore, startup monotonicity is a crucial mechanism to ensure stable power supply during the startup phase.

[0003] However, in practical engineering applications, using only a PI (proportional integral) controller for startup control will result in a "fish-scale" monotonic increase in monotonicity during the startup phase, and may even lead to a backtracking phenomenon, during the process of pulse width modulation at the highest frequency and frequency modulation after pulse width modulation. Summary of the Invention

[0004] The main technical problem addressed by this application is to provide a start-up control method, a start-up control circuit, and electronic equipment, which can solve the problem that the start-up control of the power supply regulation circuit in the prior art cannot achieve pulse width modulation at the highest frequency and during the frequency modulation process after pulse width modulation, which will lead to a monotonic increase in the monotonicity of the start-up stage in a "fish scale" pattern, or even a backtracking phenomenon.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application is: providing a start-up control method for power supply regulation circuits, wherein the start-up control method includes: acquiring circuit characteristic parameters of the power supply regulation circuit; obtaining a feedback regulation pulse width using the circuit characteristic parameters; gradually increasing the minimum frequency limiting pulse width by half using a first monotonic function to obtain a frequency limiting regulation pulse width; detecting whether the feedback regulation pulse width is less than the frequency limiting regulation pulse width; if the feedback regulation pulse width is not less than the frequency limiting regulation pulse width, generating a first control signal using the frequency limiting regulation pulse width; and sending the first control signal to the power supply regulation circuit to trigger the power supply regulation circuit to change its switching state.

[0006] The start-up control method further includes: if the feedback adjustment pulse width is less than the frequency limiting adjustment pulse width, detecting whether the feedback adjustment pulse width is less than half of the minimum frequency limiting pulse width; if the feedback adjustment pulse width is not less than half of the minimum frequency limiting pulse width, generating a first control signal using the feedback adjustment pulse width; if the feedback adjustment pulse width is less than half of the minimum frequency limiting pulse width, generating a first control signal using half of the minimum frequency limiting pulse width.

[0007] The start-up control method further includes the following step: if the feedback adjustment pulse width is not less than the frequency limiting adjustment pulse width, generating a first control signal using the frequency limiting adjustment pulse width includes: if the feedback adjustment pulse width is not less than the frequency limiting adjustment pulse width, detecting whether the frequency limiting adjustment pulse width is less than half of the minimum frequency limiting pulse width; if the frequency limiting adjustment pulse width is not less than half of the minimum frequency limiting pulse width, generating a first control signal using the frequency limiting adjustment pulse width; if the frequency limiting adjustment pulse width is less than half of the minimum frequency limiting pulse width, generating a first control signal using half of the minimum frequency limiting pulse width.

[0008] The circuit characteristic parameters include the output voltage. The step of obtaining the feedback adjustment pulse width using the circuit characteristic parameters includes: obtaining the feedback adjustment pulse width using the error value between the preset reference voltage and the output voltage; wherein the preset reference voltage is gradually increased to the target reference voltage using a second monotonic function.

[0009] The step of obtaining the feedback adjustment pulse width using the error value between the preset reference voltage and the output voltage includes: subtracting the output voltage from the preset reference voltage to obtain the error value; detecting whether the error value is negative; and if the error value is not negative, performing proportional-integral adjustment on the error value to obtain the feedback adjustment pulse width.

[0010] The start-up control method further includes: if the error value is negative, assigning the feedback adjustment pulse width of the previous step as the feedback adjustment pulse width; or, assigning the error value to zero; and performing proportional-integral adjustment on zero to obtain the feedback adjustment pulse width.

[0011] The circuit characteristic parameters include resonant current and output voltage. The steps for obtaining the feedback adjustment pulse width using the circuit characteristic parameters include: integral adjustment of the resonant current to obtain an integral voltage; obtaining a control output voltage using the output voltage and a preset reference voltage; performing slope compensation on the control output voltage to obtain a feedback compensation voltage; and obtaining the feedback adjustment pulse width by comparing the integral voltage and the feedback compensation voltage and using a preset counting period.

[0012] The circuit characteristic parameters include the output current. Before the step of obtaining the feedback adjustment pulse width using the circuit characteristic parameters, the method further includes: detecting whether the output current is greater than the preset inflection point current; if the output current is greater than the preset inflection point current, gradually increasing the minimum set pulse width using a third monotonic function to obtain the adjusted output pulse width; generating a second control signal using the adjusted output pulse width; and sending the second control signal to the power supply regulation circuit to trigger the power supply regulation circuit to change the switching state, thereby adjusting the output current.

[0013] The startup control method further includes: if the output current is not greater than the preset inflection point current, obtaining the current first output voltage and the second output voltage of the previous step of the power supply regulation circuit; detecting whether the difference between the first output voltage and the second output voltage is greater than the inflection point single-step voltage; if the difference is greater than the inflection point single-step voltage, using the minimum set pulse width to obtain the adjusted output pulse width.

[0014] The start-up control method further includes: if the difference is not greater than the inflection point single-step voltage, the minimum set pulse width is gradually increased using the fourth monotonic function to obtain the adjusted output pulse width; wherein the third monotonic function and the fourth monotonic function are arithmetic functions, and the tolerance of the third monotonic function is greater than the tolerance of the fourth monotonic function; or, the third monotonic function and the fourth monotonic function are linear functions, and the slope of the third monotonic function is greater than the slope of the fourth monotonic function.

[0015] The step of gradually increasing the minimum set pulse width using the third monotonic function to obtain the adjusted output pulse width includes: gradually increasing the minimum set pulse width using the maximum adjustment value during each switching cycle of the second control signal to obtain the adjusted output pulse width.

[0016] The step of gradually increasing the minimum set pulse width using the fourth monotonic function to obtain the adjusted output pulse width includes: gradually increasing the minimum set pulse width using the minimum adjustment value during each switching cycle of the second control signal to obtain the adjusted output pulse width.

[0017] The process includes, after the step of sending the second control signal to the power conditioning circuit to trigger the power conditioning circuit to change its switching state and thereby adjust the output current, and before the step of obtaining the feedback adjustment pulse width using the circuit characteristic parameters, the following steps are also included: detecting whether the adjusted output pulse width is less than half of the minimum frequency limiting pulse width; if the adjusted output pulse width is less than half of the minimum frequency limiting pulse width, generating a third control signal using the adjusted output pulse width; and sending the third control signal to the power conditioning circuit to trigger the power conditioning circuit to change its switching state and thereby adjust the output current.

[0018] The start-up control method also includes: if the feedback adjustment pulse width is not less than half of the minimum frequency limiting pulse width, a third control signal is generated using half of the minimum frequency limiting pulse width.

[0019] Before the step of detecting whether the output current is greater than the preset inflection point current, the method further includes: generating a fourth control signal using the initial set frequency and the minimum set pulse width; continuously sending the fourth control signal to the power conditioning circuit for a preset duration to trigger the power conditioning circuit to change the switching state, thereby adjusting the output current.

[0020] To solve the above-mentioned technical problems, another technical solution adopted in this application is: to provide a start-up control circuit, wherein the start-up control circuit is coupled to the power supply regulation circuit; wherein the start-up control circuit uses the start-up control method described in any of the above claims to control the power supply regulation circuit.

[0021] To solve the above-mentioned technical problems, another technical solution adopted in this application is: to provide an electronic device, wherein the electronic device includes a housing and a start-up control circuit connected to the housing; wherein the start-up control circuit is the start-up control circuit as described above.

[0022] The beneficial effects of this application are as follows: Unlike the prior art, the start-up control method provided in this application obtains the feedback adjustment pulse width by utilizing the circuit characteristic parameters of the power supply regulation circuit, and gradually increases the minimum frequency limiting pulse width by half using a first monotonic function to obtain the frequency limiting adjustment pulse width. In response to the feedback adjustment pulse width being no less than the frequency limiting adjustment pulse width, the frequency limiting adjustment pulse width is selectively used to generate the first control signal to form a competition control between the frequency limiting output and the loop output. That is, the smaller of the frequency limiting adjustment pulse width and the feedback adjustment pulse width is selected to control the power supply regulation circuit, thereby effectively improving the monotonicity of the highest frequency modulation and the start-up stage of frequency modulation after modulation, making it closer to linear increase, and effectively avoiding the backtracking phenomenon of output drop. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0024] Figure 1 This is a flowchart illustrating the first embodiment of the startup control method of this application;

[0025] Figure 2 This is a schematic diagram of the first embodiment of the start-up control circuit and power regulation circuit of this application;

[0026] Figure 3 This is a flowchart illustrating the second embodiment of the startup control method of this application;

[0027] Figure 4This is a schematic diagram of the second embodiment of the start-up control circuit and power regulation circuit of this application;

[0028] Figure 5 yes Figure 3 A waveform diagram of relevant signal parameters in the start-up control method;

[0029] Figure 6 yes Figure 3 Waveform diagram of the first embodiment of the starter control method;

[0030] Figure 7 yes Figure 3 Waveform diagram of the second embodiment of the start-up control method;

[0031] Figure 8 yes Figure 3 A flowchart illustrating an embodiment of S42;

[0032] Figure 9 yes Figure 3 A flowchart illustrating another embodiment of S42;

[0033] Figure 10 yes Figure 3 Waveform diagram of the third embodiment of the start-up control method;

[0034] Figure 11 yes Figure 3 Waveform diagram of the fourth embodiment of the start-up control method;

[0035] Figure 12 This is a flowchart illustrating the third embodiment of the startup control method of this application;

[0036] Figure 13 This is a flowchart illustrating the fourth embodiment of the startup control method of this application;

[0037] Figure 14 This is a flowchart illustrating the fifth embodiment of the startup control method of this application;

[0038] Figure 15 This is a schematic diagram of one embodiment of the electronic device of this application. Detailed Implementation

[0039] 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 a part of the embodiments of this application, and not all of them. 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.

[0040] The terms "first," "second," and "third" in this application are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movements between components in a specific orientation (as shown in the figures). If the specific orientation changes, the directional indications also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0041] In this document, the term "implementation" means that a specific feature, structure, or characteristic described in connection with an implementation may be included in at least one implementation of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same implementation, nor is it a separate or alternative implementation mutually exclusive with other implementations. It will be explicitly and implicitly understood by those skilled in the art that the implementations described herein can be combined with other implementations.

[0042] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] Please refer to the following: Figure 1 and Figure 2 ,in, Figure 1 This is a flowchart illustrating the first embodiment of the startup control method of this application. Figure 2 This is a schematic diagram of the first embodiment of the start-up control circuit and power regulation circuit of this application. Specifically, it may include the following steps:

[0044] S11: Obtain the circuit characteristic parameters of the power supply regulation circuit.

[0045] It is understood that the start-up control method in this embodiment is specifically applied to, for example... Figure 2 The first power supply regulation circuit 30 is shown; wherein, the first start-up control circuit 20 is coupled to the first power supply regulation circuit 30 to implement start-up control of the first power supply regulation circuit 30 using any of the start-up control methods described herein.

[0046] In some embodiments, the first power regulation circuit 30 may specifically be a half-bridge LLC (inductance capacitor, an additional inductor connected in series with two other inductors and capacitors) converter, a full-bridge LLC converter, or other forms of LLC circuit topology, which are not limited in this embodiment.

[0047] In some embodiments, the first start-up control circuit 20 may specifically include any reasonable circuit unit with signal processing function, such as a control chip, a DSP (Digital Signal Processing) chip, an MCU (Micro Controller Unit) circuit, a CPU (Central Processing Unit), a microcontroller, a field-programmable gate array, a programmable logic device, discrete gate or transistor logic devices, or discrete hardware. This application does not limit this.

[0048] It is worth noting that the term "coupled" in this article refers to any direct or indirect connection. Therefore, if the article describes a first circuit coupled to a second circuit, it means that the first circuit can be directly connected to the second circuit via electrical connection or signal connection methods such as wireless transmission or optical transmission, or indirectly connected to the second circuit via other circuits or connection methods via electrical connection or signal connection.

[0049] Specifically, the first start-up control circuit 20 samples and acquires circuit characteristic parameters in the first power supply regulation circuit 30 in real time, such as one or more of any reasonable electrical parameters such as output voltage, resonant current, and output current. This application does not limit this.

[0050] In some embodiments, the circuit characteristic parameters can be obtained by one or more of any reasonable sampling methods, such as current / voltage transformers, sampling resistors, ADCs (analog to digital converters), Hall sensors, or circuit model estimation, and this application does not limit this.

[0051] S12: The feedback adjustment pulse width is obtained using the circuit characteristic parameters.

[0052] Understandably, once one or more circuit characteristic parameters such as voltage and current are obtained for implementing feedback regulation, the circuit characteristic parameters can be processed using one of the following algorithms: voltage loop PI feedback regulation, current loop PI feedback regulation, or any other reasonable feedback regulation algorithm, to obtain the feedback regulation pulse width.

[0053] S13: The frequency limiting adjustment pulse width is obtained by gradually increasing the minimum frequency limiting pulse width by half using the first monotonic function.

[0054] Specifically, a first monotonic function is used to process half of the preset minimum frequency limiting pulse width. For example, in each switching cycle, each set number of switching cycles, or each set interval duration, a pulse width increment is added to half of the minimum frequency limiting pulse width, or a compensation coefficient greater than 1 is multiplied to gradually increase half of the minimum frequency limiting pulse width to obtain the frequency limiting adjustment pulse width.

[0055] In some embodiments, the first monotonic function may be a linear monotonic function, an arithmetic monotonic function, an exponential function, a piecewise monotonically increasing function, or any other reasonable monotonic function, and is preferably an arithmetic monotonic function. This application does not limit this.

[0056] It is worth noting that the first monotonic function can be tuned according to the power supply stability, dynamic performance, and monotonicity requirements of the first power supply regulation circuit 30, and can be obtained through simulation prediction or experimental optimization fitting.

[0057] S14: Detect whether the feedback adjustment pulse width is less than the frequency limiting adjustment pulse width.

[0058] Specifically, the currently acquired feedback adjustment pulse width is compared with the frequency limiting adjustment pulse width to determine whether the feedback adjustment pulse width is smaller than the frequency limiting adjustment pulse width.

[0059] If the feedback adjustment pulse width is not less than the frequency limiting adjustment pulse width, then S15 is executed; if the feedback adjustment pulse width is less than the frequency limiting adjustment pulse width, then S16 is executed.

[0060] S15: Generate the first control signal by adjusting the pulse width using frequency limiting.

[0061] When it is determined that the feedback adjustment pulse width is not less than the frequency limiting adjustment pulse width, the frequency limiting and amplification adjustment is used to generate the first control signal using the currently acquired frequency limiting adjustment pulse width. In this scenario, the first control signal will be generated based on the frequency limiting adjustment pulse width, i.e., the frequency limiting adjustment pulse width obtained by gradually increasing the minimum frequency limiting pulse width using the first monotonic function.

[0062] In some embodiments, the first control signal and other control signals mentioned herein may be one or more of any reasonable control signals such as PWM (Pulse Width Modulation) signal or PFM (Pulse Frequency Modulation) signal, and this application does not limit them.

[0063] S16: Detect whether the feedback adjustment pulse width is less than half of the minimum frequency limiting pulse width.

[0064] Understandably, the startup control implemented by the first power supply regulation circuit 30 will be divided into different stages, each employing a different control strategy. These include pulse width modulation (PWM) and frequency modulation (FM), with PWM typically preceding FM, thus requiring a transition between the two. The minimum PWM pulse width can be understood as the period value corresponding to the initial set frequency during the PWM stage, and also as the maximum set pulse width—the pulse width that remains high within one signal cycle. This maximum set pulse width is used to determine whether to switch to the next PWM stage. Since the signal cycle also includes a low-level interval, the maximum set pulse width is actually half the minimum PWM pulse width.

[0065] Specifically, it checks whether the currently acquired feedback adjustment pulse width is less than half of the minimum frequency limiting pulse width.

[0066] If the feedback adjustment pulse width is not less than half of the minimum frequency limiting pulse width, then S17 is executed; if the feedback adjustment pulse width is not less than half of the minimum frequency limiting pulse width, then S18 is executed.

[0067] S17: Generate the first control signal by adjusting the pulse width using feedback.

[0068] When the feedback adjustment pulse width is determined to be no less than half of the minimum frequency limiting pulse width, it is a loop output adjustment. The first control signal is generated by using the currently acquired feedback adjustment pulse width. In this scenario, one of the voltage loop PI feedback adjustment, current loop PI feedback adjustment, or any other reasonable feedback adjustment algorithm is used to process the circuit characteristic parameters to obtain the feedback adjustment pulse width and generate the first control signal.

[0069] S18: Generate the first control signal using half of the minimum frequency-limited pulse width.

[0070] In determining that the feedback adjustment pulse width is not less than half of the minimum frequency limiting pulse width, that is, the current stage is still the frequency limiting pulse width modulation stage, or the transition between the frequency limiting pulse width modulation stage and the frequency limiting pulse width modulation stage, it can also be understood as the last pulse width modulation, and the first control signal is generated with half of the minimum frequency limiting pulse width. That is, in this scenario, the signal frequency of the first control signal is the initial set frequency, and its pulse width is equal to half of the minimum frequency limiting pulse width.

[0071] Therefore, by using the above-mentioned selection strategy for frequency limiting output and voltage loop output, the transition between pulse width modulation and frequency modulation is smoother, and the operating frequency is effectively limited between the maximum and minimum operating frequencies, so as to effectively avoid the backtracking phenomenon of output drop.

[0072] S19: Send the first control signal to the power conditioning circuit to trigger the power conditioning circuit to change the switching state.

[0073] The first control signal is sent to the first power conditioning circuit 30 to trigger the switching element inside the first power conditioning circuit 30 to turn on or off, thereby adjusting its power output in real time.

[0074] The above scheme selectively utilizes the frequency limiting adjustment pulse width to generate the first control signal, thereby forming a competition control between the frequency limiting output and the loop output. That is, the smaller of the frequency limiting adjustment pulse width and the feedback adjustment pulse width is selected to control the first power supply regulation circuit 30. This can effectively improve the monotonicity of the highest frequency modulation and the start-up phase of frequency modulation after the modulation is completed, making it closer to linear increase, and effectively avoiding the back channel phenomenon of output drop.

[0075] This method detects circuit characteristic parameters during system startup and dynamically adjusts the minimum frequency-limiting pulse width using a monotonic function to achieve progressive control of the power switch state, effectively avoiding instability phenomena such as current surges and voltage overshoots during startup. Furthermore, it achieves soft-start by gradually increasing the pulse width, preventing current surges and voltage overshoots for a smoother startup. The dynamic selection between feedback-adjusted pulse width and frequency-limited pulse width provides strong adaptability and effectively improves the monotonicity during startup. Precise pulse width adjustment using a monotonic function ensures controllable startup and high control accuracy.

[0076] Furthermore, in one embodiment, the circuit characteristic parameters include the output voltage, and in the above S12, it specifically includes: using the error value between the preset reference voltage and the output voltage to obtain feedback adjustment of the pulse width.

[0077] Understandably, when obtaining the output voltage of the first power supply regulation circuit 30, the error value between the preset reference voltage and the output voltage can be obtained by subtracting the output voltage from the preset reference voltage, and the feedback regulation pulse width can be obtained by proportional-integral adjustment of the error value.

[0078] Specifically, the preset reference voltage can be processed using a second monotonic function to gradually increase the preset reference voltage to the target reference voltage. That is, a voltage control loop control strategy is adopted. During the process of increasing the preset reference voltage to the target reference voltage (i.e., the target voltage value) in a certain step, the error value between the preset reference voltage and the output voltage is proportional-integral adjustment to obtain the feedback adjustment pulse width.

[0079] Please see Figure 3 , Figure 3 This is a flowchart illustrating the second embodiment of the startup control method of this application. The startup control method of this embodiment... Figure 1A detailed implementation diagram of the start-up control method is shown, which specifically includes the following steps:

[0080] S41: Obtain the circuit characteristic parameters of the power supply regulation circuit.

[0081] S42: The feedback adjustment pulse width is obtained by utilizing the circuit characteristic parameters.

[0082] S43: The frequency limiting adjustment pulse width is obtained by gradually increasing the minimum frequency limiting pulse width by half using the first monotonic function.

[0083] S44: Detect whether the feedback adjustment pulse width is less than the frequency limiting adjustment pulse width.

[0084] Among them, S41, S42, S43 and S44 and Figure 1 S11, S12, S13 and S14 are the same. Please refer to the textual descriptions of S11, S12, S13 and S14 and their related texts for details. They will not be repeated here.

[0085] S45: Detect whether the frequency limiting adjustment pulse width is less than half of the minimum frequency limiting pulse width.

[0086] Please continue reading. Figure 4 , Figure 4 This is a schematic diagram of the second embodiment of the start-up control circuit and power regulation circuit of this application.

[0087] It is understood that the charge control method in this embodiment can specifically be as follows: Figure 4 The second start-up control circuit 60 shown implements start-up control for the second power supply regulation circuit 50.

[0088] In some embodiments, the second power supply regulation circuit 50 includes a power switching circuit 51, a switching freewheeling circuit 52, a resonant circuit 53, an isolation transformer 54, a rectifier circuit 55, and a regulated output circuit 56; the power switching circuit 51 includes a first switching transistor Q1 and a second switching transistor Q2; the switching freewheeling circuit 52 includes a first freewheeling resistor Rc1, a second freewheeling resistor Rc2, a first freewheeling capacitor C1, a second freewheeling capacitor C2, a first diode D1, and a second diode D2; the resonant circuit 53 includes a first resonant capacitor Cr1, a second resonant capacitor Cr2, and a resonant inductor Lr; the isolation transformer 54 includes a primary winding RZ0, a first secondary winding RZ1, and a second secondary winding RZ2; the rectifier circuit 55 includes a third diode D3 and a fourth diode D4; and the regulated output circuit 56 includes a regulated resistor Ro and a regulated capacitor Co.

[0089] Specifically, the first terminal of the first switching transistor Q1 is coupled to the first terminal of the first freewheeling resistor Rc1, the second terminal of the first diode D1, and the first terminal of the first resonant capacitor Cr1, and is used to couple to the first terminal of the power supply circuit 101. The second terminal of the second switching transistor Q2 is coupled to the second terminal of the second freewheeling capacitor C2, the first terminal of the second diode D2, and the second terminal of the second resonant capacitor Cr2, and is used to couple to the second terminal of the power supply circuit 101. The second terminal of the first freewheeling resistor Rc1 is coupled to the first terminal of the first freewheeling capacitor C1. The second terminal of the first freewheeling capacitor C1 is coupled to the first terminal of the first diode D1, the second terminal of the first switching transistor Q1, the first terminal of the second switching transistor Q2, the first terminal of the second freewheeling resistor Rc2, the second terminal of the second diode D2, and the first terminal of the resonant inductor Lr. The second terminal of the second freewheeling resistor Rc2 is coupled to the first terminal of the second freewheeling capacitor C2. The second terminal of the first resonant capacitor Cr1 is coupled to the first terminal of the second resonant capacitor Cr2 and the second terminal of the primary winding RZ0. The second terminal of the resonant inductor Lr is coupled to the first terminal of the primary winding RZ0.

[0090] The primary winding RZ0 is coupled to the first secondary winding RZ1 and the second secondary winding RZ2. The first end of the third diode D3 is coupled to the first end of the first secondary winding RZ1. The second end of the third diode D3 is coupled to the second end of the fourth diode D4 and the first end of the voltage regulator Ro, and is used to couple to the first end of the load resistor R in the load circuit 102. The first end of the fourth diode D4 is coupled to the second end of the second secondary winding RZ2. The second end of the voltage regulator Ro is coupled to the first end of the voltage regulator Co. The second end of the voltage regulator Co is coupled to the second end of the first secondary winding RZ1 and the first end of the second secondary winding RZ2, and is used to couple to the second end of the load resistor R in the load circuit 102.

[0091] In some embodiments, the second start-up control circuit 60 further includes a first proportional filter correction sub-circuit 61, a second proportional filter correction sub-circuit 62, and a control sub-circuit 63. The first proportional filter correction sub-circuit 61 is coupled to the voltage regulator resistor Ro and the control sub-circuit 63. The second proportional filter correction sub-circuit 62 is coupled to the voltage regulator resistor Ro, the voltage regulator capacitor Co, and the control sub-circuit 63. The control sub-circuit 63 is coupled to the third terminal of the first switching transistor Q1 and the third terminal of the second switching transistor Q2.

[0092] In some embodiments, the first switch Q1 and the second switch Q2 may be a MOSFET (Metal-Oxide Semiconductor Field Effect Transistor), a transistor, a thin-film transistor, a field-effect transistor, or any other reasonable switch, and this application does not limit them.

[0093] It is worth noting that, to distinguish the two ends of each switching transistor except for the control terminal, one terminal is referred to as the first terminal and the other as the second terminal. When each switching transistor is a bipolar junction transistor (BJT), the control terminal, i.e., the third terminal, can specifically be the base, the first terminal as the collector, and the second terminal as the emitter; or, the third terminal can specifically be the base, the first terminal as the emitter, and the second terminal as the collector.

[0094] When the switching transistors mentioned above are MOSFETs, thin-film transistors, or field-effect transistors, the third terminal can be the gate, the first terminal can be the drain, and the second terminal can be the source; or, the third terminal can also be the gate, the first terminal can be the source, and the second terminal can be the drain.

[0095] In particular, when each switching transistor is a MOSFET, a thin film transistor, or a field-effect transistor, it can also be a composite transistor or a single transistor, which is not limited in this application.

[0096] It is worth noting that in other embodiments, the second power supply regulation circuit 50 may be a half-bridge LLC converter, a full-bridge LLC converter, or any other reasonable LLC circuit topology. For example, the power switching circuit 51 may be a full-bridge switching circuit or an asymmetrical half-bridge switching circuit, and the rectifier circuit 55 may be a full-bridge rectifier circuit or a half-bridge rectifier circuit composed of various switching transistors, or any reasonable circuit form for realizing AC to DC conversion. This application does not limit this.

[0097] Please continue. Figure 5 , Figure 5 yes Figure 3 A waveform diagram of relevant signal parameters in the start-up control method.

[0098] In this embodiment, the start-up control implemented by the second power supply regulation circuit 50 is divided into different stages and different control strategies are adopted for each stage. For ease of understanding, taking the start-up stage as an example, which includes the first stage 0-t1, the second stage t1-t2, the third stage t2-t3, and the fourth stage t3-t4, it can be seen that in the first stage 0-t1, the start-up control method corresponds to an open-loop control with a set duty cycle and a set switching frequency, such as the minimum set pulse width Dmin and the initial set frequency Fs, and the duration is the set value; in the second stage t1-t2, it is the pulse width modulation stage, that is, the signal frequency is constant at the initial set frequency Fs, and the pulse width, or the duty cycle, is adjusted in a frequency limiting and width modulation stage; in the third stage t2-t3, it is the width limiting and frequency modulation stage corresponding to S41-S411 in this embodiment, that is, the pulse width is constant at the maximum set pulse width Dmax, which is also the minimum frequency limiting pulse width Tmin. MINHalf of the signal frequency is controlled by the frequency limiting output and the loop output in the competition control stage, and during this process, the preset reference voltage Vref increases linearly; in the fourth stage t3-t4, the preset reference voltage Vref has increased to the target reference voltage Vm, and the loop output takes over the control strategy and enters a stable working state, that is, the start-up stage has ended.

[0099] Please continue reading. Figure 6 and Figure 7 , Figure 6 yes Figure 3 A waveform diagram of the first embodiment of the start-up control method. Figure 7 yes Figure 3 A waveform diagram of the second embodiment of the start-up control method.

[0100] Understandably, the circuit characteristic parameters obtained by the control sub-circuit 63 from the power supply regulation circuit can be the output voltage Vo or the output current Io, and the corresponding control strategy can be voltage-type control or current-type control.

[0101] For ease of understanding, taking the output voltage Vo as an example, the control sub-circuit 63 can specifically use the first proportional filter correction sub-circuit 61 and the second proportional filter correction sub-circuit 62 to sample, filter, and correct the output current Io and output voltage Vo in the regulated output circuit 56, respectively. Then, the filtered and corrected output voltage Vo is subtracted from the preset reference voltage Vref to obtain the error value. The error value is then proportional-integral adjustment to obtain the feedback adjustment pulse width T. PI .

[0102] In this process, after the frequency limiting and pulse width modulation control is completed at time t2, the frequency limiting will be gradually released, and the voltage control loop will take over the control. The preset reference voltage Vref, i.e., the reference voltage, will be increased to the target reference voltage Vm in a certain step. That is, the preset reference voltage Vref will be gradually increased to the target reference voltage Vm using a second monotonic function. During this process, the feedback adjustment pulse width T is obtained by proportional-integral adjustment of the error value between the preset reference voltage Vref and the filtered and corrected output voltage Vo. PI .

[0103] Furthermore, the control sub-circuit 63 is also used to gradually increase the minimum frequency limiting pulse width T using the first monotonic function. MIN Obtain the frequency-limited pulse width T CMP This will create a competition between the frequency-limited output and the voltage loop output for control, therefore the switching frequency between the two needs to be adjusted, i.e., the corresponding feedback pulse width T. PI and frequency limiting adjustment pulse width T CMP Make a selection to achieve the corresponding control.

[0104] Specifically, the control sub-circuit 63 will adjust the pulse width T in response to the currently acquired feedback. PI Not less than the frequency limiting adjustment pulse width T CMP Detection of frequency limiting adjustment pulse width T CMP Is it less than the minimum frequency-limiting pulse width T? MIN One-half of.

[0105] It is worth noting that the frequency limiting adjustment pulse width T CMP Adjusted to be no less than the minimum frequency limiting pulse width T MIN The half-time can be understood as the end time t2 of the frequency limiting and pulse width modulation phase.

[0106] Among them, if the frequency limiting adjustment pulse width T CMP Not less than the minimum frequency-limiting pulse width T MIN If it is half of the value, then execute S46. If the frequency limiting pulse width T is adjusted... CMP Less than the minimum frequency-limited pulse width T MIN If it is half of the value, then execute S47.

[0107] S46: Generate the first control signal by adjusting the pulse width using frequency limiting.

[0108] Specifically, in determining the frequency limiting adjustment pulse width T CMP Not less than the minimum frequency-limiting pulse width T MIN If the pulse width is half of the current pulse width, then the frequency-limited modulation stage has begun. This can be understood as the current time being t2, or after t2, and the currently acquired frequency-limited modulation pulse width T is selected. CMP Generate the first control signal.

[0109] S47: Generate the first control signal using half of the minimum frequency-limited pulse width.

[0110] In determining the frequency limiting adjustment pulse width T CMP Less than the minimum frequency-limited pulse width T MIN If the pulse width is half of the current pulse width, then the frequency limiting phase has not yet begun. This can be understood as the current time being before time t2, requiring the use of the minimum frequency limiting pulse width T. MIN One-half of it generates the first control signal.

[0111] The above scheme selects feedback adjustment pulse width T in two stages: frequency limiting and frequency amplification adjustment and loop output adjustment. PI and frequency limiting adjustment pulse width T CMP The smaller one controls the second power supply regulation circuit 50, which can effectively improve the monotonicity of the pulse width modulation, frequency modulation and the transition from pulse width modulation to frequency modulation, making it closer to linear increase, and effectively avoid the back channel phenomenon of output drop.

[0112] S48: Detect whether the feedback adjustment pulse width is less than half of the minimum frequency limiting pulse width.

[0113] S49: Generate the first control signal by adjusting the pulse width using feedback.

[0114] S410: Generates the first control signal using half of the minimum frequency-limited pulse width.

[0115] S411: Send the first control signal to the power conditioning circuit to trigger the power conditioning circuit to change the switching state.

[0116] Among them, S48, S49, S410 and S411 and Figure 1 S16, S17, S18 and S19 are the same. Please refer to S16, S17, S18 and S19 and their related textual descriptions for details. They will not be repeated here.

[0117] It is worth noting that the third stage (t2-t3) and the fourth stage (t3-t4) will include two stages: frequency limiting and amplification adjustment, and loop output adjustment. Specifically, determining the feedback adjustment pulse width T... PI Less than the frequency limiting adjustment pulse width T CMP When this occurs, the loop output is adjusted to utilize the currently acquired feedback to regulate the pulse width T. PI A first control signal is generated. This first control signal specifically includes a first drive signal PWMA and a second drive signal PWMB. In this scenario, the first drive signal PWMA and the second drive signal PWMB will adjust the pulse width T using feedback. PI As a reference, the pulse width Ta of the first drive signal PWMA is equal to the feedback adjustment pulse width T. PI The pulse width Tb of the second driving signal PWMB is equal to the pulse width Ta of the first driving signal PWMA.

[0118] Taking the frequency limiting and frequency adjustment step size as ∆T, that is, the first monotonic function is an arithmetic monotonic function with a tolerance of ∆T, as an example, since the frequency expansion speed is much greater than the adjustment speed, the next control step still satisfies T. MIN / 2<T PI <T CMP +∆T, until the start-up control ends and the loop takes over the control.

[0119] Understandably, the above T PI <T CMP The time corresponding to +(n-1)∆T (n is a positive integer) is time t3, which is the switching time between frequency limiting output and voltage loop output; and the time corresponding to the preset reference voltage Vref being equal to the target reference voltage Vm is time t4. After time t4, the start-up control stage ends and the normal operation stage begins, with voltage loop output as the control strategy for the normal operation stage.

[0120] Therefore, by using the above-mentioned selection strategy for frequency limiting output and voltage loop output, the transition between pulse width modulation and frequency modulation is smoother, and the operating frequency is effectively limited between the maximum operating frequency Fmax and the minimum operating frequency Fmin, so as to effectively avoid the back channel phenomenon of output drop.

[0121] In addition, the control sub-circuit 63 actually sends the corresponding first control signal, namely the first drive signal PWMA and the second drive signal PWMB, to the first switch Q1 and the second switch Q2 respectively, so as to trigger the first switch Q1 and the second switch Q2 to turn on or off, thereby regulating the output voltage Vo and / or the output current Io.

[0122] Please continue reading. Figure 8 , Figure 8 yes Figure 3 A flowchart illustrating an embodiment of S42 is shown. In one embodiment, the start-up control method of this application, in addition to the above-described S41-S411, further includes some more specific steps. Specifically, S42 may further include the following steps:

[0123] S4211: Subtract the output voltage from the preset reference voltage to obtain the error value.

[0124] Specifically, the control sub-circuit 63 subtracts the output voltage Vo from the preset reference voltage Vref to obtain the error value.

[0125] S4212: Detect whether the error value is negative.

[0126] Understandably, in the loop control during startup, when the error value is negative, it is actually an invalid parameter and cannot participate in the calculation.

[0127] Specifically, whether the detection error value is negative.

[0128] If the error value is negative, then S4213 is executed; if the error value is not negative, then S4214 is executed.

[0129] S4213: Assign the feedback adjustment pulse width of the previous beat to the feedback adjustment pulse width.

[0130] When the error value is determined to be negative, the previous feedback adjustment pulse width T is adjusted. PI The value assigned is the feedback adjustment pulse width T. PI The feedback adjustment pulse width T obtained from the previous operation is about to be processed. PI The value assigned is the current feedback adjustment pulse width T. PI .

[0131] S4214: The feedback adjustment pulse width is obtained by proportional-integral adjustment of the error value.

[0132] When the error value is determined to be non-negative, the feedback adjustment pulse width T is obtained by performing proportional-integral adjustment on the error value. PI .

[0133] Furthermore, in one embodiment, the above-mentioned S4214 can be replaced by: assigning the currently obtained error value to zero, and performing proportional-integral adjustment on zero to obtain the feedback adjustment pulse width T. PI .

[0134] Please continue reading Figure 9 , Figure 9 yes Figure 3 A flowchart illustrating another embodiment of S42 is shown. In one embodiment, the start-up control method of this application, in addition to S41-S411 described above, further includes some more specific steps. Specifically, S42 may further include the following steps:

[0135] S4221: Integral voltage is obtained by integral adjustment of the resonant current.

[0136] Please continue reading Figure 10 and Figure 11 , Figure 10 yes Figure 3 A waveform diagram of the third embodiment of the start-up control method. Figure 11 yes Figure 3 A waveform diagram of the fourth embodiment of the start-up control method.

[0137] In another embodiment, the circuit characteristic parameters obtained by the control sub-circuit 63 from the second power supply regulation circuit 50 may specifically be the resonant current I. Lr And the output voltage Vo, and the corresponding control strategy can be current-type control.

[0138] Specifically, the control sub-circuit 63 can also control the resonant current I. Lr Integral voltage is obtained by performing integral regulation.

[0139] S4221: The control output voltage is obtained by using the output voltage and the preset reference voltage.

[0140] The output voltage is controlled by using a proportional-integral controller to adjust the output voltage Vo and the preset reference voltage Vref according to proportional-integral adjustment or by setting a function.

[0141] The specific formula for calculating this defined function can be:

[0142] Vo_sample=Kv*Vo;

[0143] Vpi=kp*(Vref-Vo_sample)+ki*Ts*1 / (z-1)*(Vref-Vo_sample);

[0144] Where Kv is the scaling factor, Vo is the output voltage, Vpi is the control output voltage, Vref is the preset reference voltage, kp is the proportional control factor of the proportional-integral controller, ki is the integral control factor of the proportional-integral controller, Ts is the adjustment period value of the proportional-integral controller, and z is the discrete mathematical variable.

[0145] S4221: Slope compensation is performed on the control output voltage to obtain the feedback compensation voltage.

[0146] The control output voltage is multiplied by the set compensation slope to perform slope compensation processing to obtain the feedback compensation voltage.

[0147] S4221: The feedback adjustment pulse width is obtained by comparing the integral voltage and the feedback compensation voltage and the preset counting period.

[0148] The amplitude of the currently acquired integral voltage is compared with that of the feedback compensation voltage. In response to the comparison result, and / or the counter in the proportional-integral controller increments to half of the preset period value to determine the time corresponding to the turn-off pulse, thereby determining the feedback adjustment pulse width T. PI .

[0149] At this point, unlike voltage-type control, in current-type control, the feedback adjustment pulse width T is... PI In practice, the equivalent feedback adjustment pulse width T is given by the turn-off pulse determined by the amplitude comparison result and / or the counter incrementing to half of the preset period value. EQ .

[0150] It is worth noting that the above-mentioned feedback adjustment pulse width T PI And equivalent feedback adjustment of pulse width T EQ It also includes the dead zone of the switching transistor.

[0151] The above scheme selects feedback adjustment pulse width T in two stages: frequency limiting and frequency amplification adjustment and loop output adjustment. PI And equivalent feedback adjustment of pulse width T EQ The smaller one controls the second power supply regulation circuit 50, which can effectively improve the monotonicity of the pulse width modulation, frequency modulation and the transition from pulse width modulation to frequency modulation, making it closer to linear increase, and effectively avoid the back channel phenomenon of output drop.

[0152] Please see Figure 12 , Figure 12 This is a flowchart illustrating the third embodiment of the startup control method of this application. The startup control method of this embodiment... Figure 1 A detailed implementation diagram of the start-up control method is shown, which specifically includes the following steps:

[0153] S71: Obtain the circuit characteristic parameters of the power supply regulation circuit.

[0154] Among them, S71 and Figure 1 The same applies to S11. Please refer to S11 and its related textual descriptions for details, which will not be repeated here.

[0155] S72: Detect whether the output current is greater than the preset inflection point current.

[0156] Understandably, during the frequency limiting and bandwidth adjustment phase, i.e. Figure 5 In the second stage t1-t2 shown, in order to ensure that the output current of the first power supply regulation circuit 30 can increase linearly and monotonically during the startup stage, a preset inflection point current is obtained by experimental calibration or simulation optimization fitting based on the inflection point of the output current in the actual application scenario, that is, the position where the current change trend changes significantly. This preset inflection point current is used as a threshold for judging whether the change trend of the output current during the startup stage is too large.

[0157] Specifically, the circuit characteristic parameters include the output current, and the first start-up control circuit 20 is also used to detect whether the currently acquired output current is greater than the preset inflection point current.

[0158] If the output current is greater than the preset inflection point current, then S73 is executed; if the output current is not greater than the preset inflection point current, then S76 is executed.

[0159] S73: The minimum set pulse width is gradually increased using the third monotonic function to obtain the adjustable output pulse width.

[0160] Understandably, in the control strategy of the first power supply regulation circuit 30, a minimum set pulse width and a maximum set pulse width are usually defined according to the physical characteristics of its internal switching elements. That is, the pulse width of the control signal generated by the first start-up control circuit 20 is limited to a threshold range with the minimum set pulse width and the maximum set pulse width as the lower and upper limits, respectively.

[0161] Specifically, when it is determined that the current output current is greater than the preset inflection point current, the third monotonic function is used to process the preset minimum set pulse width. For example, the third monotonic function is used to accumulate a first pulse width increment or multiply by a first compensation coefficient greater than 1 on the basis of the minimum set pulse width in each switching cycle, each set number of switching cycles, or each set interval duration, so as to gradually adjust and increase the minimum set pulse width to obtain the adjusted output pulse width.

[0162] In some embodiments, the third monotonic function may be a linear monotonic function, an arithmetic monotonic function, an exponential function, a piecewise monotonically increasing function, or any other reasonable monotonic function, and is preferably an arithmetic monotonic function. This application does not limit this.

[0163] It is worth noting that the third monotonic function can be tuned according to the power supply stability, dynamic performance, and monotonicity requirements of the first power supply regulation circuit 30, and can be obtained through simulation prediction or experimental optimization fitting.

[0164] S74: Generates a second control signal by adjusting the output pulse width.

[0165] It is understandable that the adjusted output pulse width corresponds to the on-time of the second control signal, which can actually correspond to the duration for which the second control signal remains in a high-level state.

[0166] Specifically, the first control signal is generated by using the adjusted output pulse width obtained by each third monotonic function adjustment.

[0167] In some embodiments, the second control signal and other control signals mentioned herein may be one or more of any reasonable control signals such as PWM (Pulse Width Modulation) signal or PFM (Pulse Frequency Modulation) signal, and this application does not limit them.

[0168] S75: Sends the second control signal to the power conditioning circuit to trigger the power conditioning circuit to change the switching state, thereby adjusting the output current.

[0169] The second control signal is sent to the first power conditioning circuit 30 to trigger the switching element inside the first power conditioning circuit 30 to turn on or off, thereby adjusting its output current in real time.

[0170] S76: Obtain the current first output voltage and the second output voltage of the previous step of the power supply regulation circuit.

[0171] Once it is determined that the current output current is not greater than the preset inflection point current, the output voltage of the first power supply regulation circuit 30 is sampled at set intervals or in real time. In order to distinguish the sampled voltage at different times, the output voltage sampled at the current time is set as the first output voltage, and the output voltage sampled at the previous time, or the previous sampling time, is set as the second output voltage, that is, the second output voltage of the previous step.

[0172] S77: Detect whether the difference between the first output voltage and the second output voltage is greater than the single-step voltage at the inflection point.

[0173] Understandably, in order to ensure that the output voltage of the first power supply regulation circuit 30 increases almost linearly and monotonically during the startup phase, the inflection point single-step voltage is obtained through experimental calibration or simulation optimization fitting based on the location where the output voltage change trend changes significantly in the actual application scenario. This voltage is used as a threshold to judge whether the change trend of the output voltage during the startup phase is too large.

[0174] Specifically, the first start-up control circuit 20 subtracts the second output voltage from the first output voltage to obtain the difference between the two, that is, the change in the current output voltage compared to the output voltage at the previous sampling time, and detects whether the difference is greater than the inflection point single-step voltage.

[0175] If the difference is greater than the single-step voltage at the inflection point, then S78 is executed; if the difference is not greater than the single-step voltage at the inflection point, then S79 is executed.

[0176] S78: The output pulse width is adjusted by using the minimum set pulse width.

[0177] When the difference is determined to be greater than the inflection point single-step voltage, the output pulse width is adjusted to be equal to the minimum set pulse width. In other words, in this scenario, the second control signal is generated using the minimum set pulse width.

[0178] S79: The minimum set pulse width is gradually increased using the fourth monotonic function to obtain the adjustable output pulse width.

[0179] Similarly, when it is determined that the difference is not greater than the single-step voltage at the inflection point, the fourth monotonic function is used to accumulate a second pulse width increment on the basis of the minimum set pulse width in each switching cycle, each set number of switching cycles, or each set interval duration, or multiply by a second compensation coefficient greater than 1, so as to gradually adjust and increase the minimum set pulse width to obtain the adjusted output pulse width.

[0180] In some embodiments, the fourth monotonic function may be a linear monotonic function, an arithmetic monotonic function, an exponential function, a piecewise monotonically increasing function, or any other reasonable monotonic function, and is preferably an arithmetic monotonic function. This application does not limit this.

[0181] In some embodiments, the third monotonic function and the fourth monotonic function are both arithmetic functions, and the common difference of the third monotonic function is greater than the common difference of the fourth monotonic function, that is, the second pulse width increment is less than the first pulse width increment. The specific details are determined by the actual application scenario, and this application does not limit them.

[0182] In some embodiments, the third monotonic function and the fourth monotonic function are linear functions, and the slope of the third monotonic function is greater than the slope of the fourth monotonic function, that is, the first compensation coefficient is greater than the second compensation coefficient. The specific details are determined by the actual application scenario, and this application does not limit them.

[0183] It is worth noting that, through the aforementioned third and fourth monotonic functions, when the output current is greater than the preset inflection point current, a larger pulse width adjustment increment is used to achieve pulse width adjustment, and when the output current is not greater than the preset inflection point current and the difference is not greater than the inflection point single-step voltage, a smaller pulse width adjustment increment is used to achieve pulse width adjustment. This effectively improves the monotonicity of the startup phase, making it closer to linear increase, and effectively avoids the back channel phenomenon of output drop.

[0184] S710: The feedback pulse width is adjusted using circuit characteristic parameters.

[0185] S711: The frequency limiting adjustment pulse width is obtained by gradually increasing the minimum frequency limiting pulse width by half using the first monotonic function.

[0186] S712: Detects whether the feedback adjustment pulse width is less than the frequency limiting adjustment pulse width.

[0187] S713: Generates the first control signal by adjusting the pulse width using frequency limiting.

[0188] S714: Detects whether the feedback adjustment pulse width is less than half of the minimum frequency limiting pulse width.

[0189] S715: Generates the first control signal by adjusting the pulse width using feedback.

[0190] S716: Generates the first control signal using half of the minimum frequency-limited pulse width.

[0191] S717: Sends the first control signal to the power conditioning circuit to trigger the power conditioning circuit to change the switching state.

[0192] Among them, S710, S711, S712, S713, S714, S715, S716 and S717 and Figure 1 S12, S13, S14, S15, S16, S17, S18 and S19 are the same. For details, please refer to S12, S13, S14, S15, S16, S17, S18 and S19 and their related textual descriptions. They will not be repeated here.

[0193] Furthermore, in one embodiment, S73 above specifically includes: gradually increasing the minimum set pulse width by the maximum adjustment value during the switching cycle of each second control signal to obtain the adjusted output pulse width.

[0194] Understandably, the adjustment of the output pulse width can be achieved by using an arithmetic monotonic function, with the tolerance of the arithmetic monotonic function set as the maximum adjustment value. This allows for the accumulation of a maximum adjustment value during each switching cycle of the second control signal, based on the minimum set pulse width, to gradually increase the minimum set pulse width and obtain the adjusted output pulse width.

[0195] In other embodiments, the adjustment of the output pulse width can be specifically set at a certain number of switching cycles or at a certain time interval, and this application does not limit it in this way.

[0196] Furthermore, in one embodiment, S79 above specifically includes: gradually increasing the minimum set pulse width by the minimum adjustment value during each switching cycle of the second control signal to obtain the adjusted output pulse width.

[0197] Similarly, the adjustment of the output pulse width can also be achieved using an arithmetic monotonic function, with the tolerance of the arithmetic monotonic function set as the minimum adjustment value. Based on the minimum set pulse width, a minimum adjustment value is accumulated in each switching cycle of the second control signal to gradually increase the minimum set pulse width and obtain the adjusted output pulse width.

[0198] In other embodiments, the adjustment of the output pulse width can be specifically set at a certain number of switching cycles or at a certain time interval, and this application does not limit it in this way.

[0199] Please see Figure 13 , Figure 13 This is a flowchart illustrating the fourth embodiment of the startup control method of this application. The startup control method of this embodiment... Figure 12 A detailed implementation diagram of the start-up control method is shown, which specifically includes the following steps:

[0200] S81: Obtain the circuit characteristic parameters of the power supply regulation circuit.

[0201] S82: Detect whether the output current is greater than the preset inflection point current.

[0202] S83: The minimum set pulse width is gradually increased using the third monotonic function to obtain the adjusted output pulse width.

[0203] S84: Generates a second control signal by adjusting the output pulse width.

[0204] S85: Sends the second control signal to the power conditioning circuit to trigger the power conditioning circuit to change the switching state, thereby adjusting the output current.

[0205] S86: Obtain the current first output voltage and the second output voltage of the previous step of the power supply regulation circuit.

[0206] S87: Detect whether the difference between the first output voltage and the second output voltage is greater than the single-step voltage at the inflection point.

[0207] S88: The output pulse width is adjusted by using the minimum set pulse width.

[0208] S89: The minimum set pulse width is gradually increased using the fourth monotonic function to obtain the adjustable output pulse width.

[0209] Among them, S81, S82, S83, S84, S85, S86, S87, S88, S89 and S79 and Figure 12 S71, S72, S73, S74, S75, S76, S77, S78, S79 and S79 are the same. For details, please refer to the textual descriptions of S71, S72, S73, S74, S75, S76, S77, S78, S79 and S79 and their related texts. They will not be repeated here.

[0210] S810: Detects whether the output pulse width is less than half of the minimum frequency limiting pulse width.

[0211] In this embodiment, the start-up control method is applied to, for example... Figure 4 Taking the second start-up control circuit 60 and the second power supply regulation circuit 50 shown as an example, it can be seen that, as Figure 5-7 As shown, the currently acquired adjustable output pulse width T is detected. PWM Is it less than the minimum frequency-limiting pulse width T? MIN Half of the minimum frequency-limited pulse width T MIN This refers to the period value corresponding to the initial set frequency Fs of the first stage 0-t1 and the second stage t1-t2, which is also the maximum set pulse width Dmax.

[0212] Among them, if the output pulse width T is adjusted PWM Less than the minimum frequency limiting pulse width T MIN If it is half of the value, then S811 is executed; if the output pulse width T is adjusted... PWM Not less than the minimum frequency-limiting pulse width T MIN If half of it is, then S812 is executed.

[0213] S811: Generates a third control signal by adjusting the output pulse width.

[0214] Determine the adjustment output pulse width T PWM Less than the minimum frequency-limited pulse width T MIN When the pulse width modulation (PWM) phase is halfway through, time t2 is still in the pulse width modulation (PWM) phase. At this time, the signal frequency is the initial set frequency Fs, so that the currently obtained adjusted output pulse width T is used. PWM Generate a third control signal.

[0215] Among them, the start-up control method is specifically applied to, for example Figure 4 In the power regulation circuit shown, taking the third control signal specifically including the first drive signal PWMA and the second drive signal PWMB as an example, it can be seen that the signal frequency of the first drive signal PWMA is the initial set frequency Fs, and its pulse width Ta is equal to the adjusted output pulse width T. PWMThe second driving signal PWMB is also at its maximum frequency, and its pulse width Tb is equal to the pulse width Ta of the first driving signal PWMA.

[0216] S812: Generates a third control signal using half of the minimum frequency-limiting pulse width.

[0217] Determine the adjustment output pulse width T PWM Not less than the minimum frequency-limiting pulse width T MIN When t2 is halfway through, it is the pulse width modulation stage, and the last pulse width modulation, with the minimum frequency-limited pulse width T. MIN Half of the signal generates the third control signal. In this scenario, the signal frequency of the first drive signal PWMA is the initial set frequency Fs, and its pulse width Ta is equal to the minimum frequency limiting pulse width T. MIN Half of the first drive signal PWMA; the second drive signal PWMB is also at its maximum frequency, and its pulse width Tb is equal to the pulse width Ta of the first drive signal PWMA.

[0218] S813: Sends the third control signal to the power conditioning circuit to trigger the power conditioning circuit to change the switching state, thereby regulating the output current.

[0219] The third control signal is sent to the second power supply regulation circuit 50, that is, the first drive signal PWMA and the second drive signal PWMB are sent to the first switch Q1 and the second switch Q2 respectively, so as to trigger the first switch Q1 and the second switch Q2 to turn on or off, thereby regulating the output current Io.

[0220] S814: The feedback pulse width is adjusted using circuit characteristic parameters.

[0221] S815: The frequency limiting adjustment pulse width is obtained by gradually increasing the minimum frequency limiting pulse width by half using the first monotonic function.

[0222] S816: Detects whether the feedback adjustment pulse width is less than the frequency limiting adjustment pulse width.

[0223] S817: Generates the first control signal by adjusting the pulse width using frequency limiting.

[0224] S818: Detects whether the feedback adjustment pulse width is less than half of the minimum frequency limiting pulse width.

[0225] S819: Generates the first control signal by adjusting the pulse width using feedback.

[0226] S820: Generates the first control signal using half of the minimum frequency-limited pulse width.

[0227] S821: Sends the first control signal to the power conditioning circuit to trigger the power conditioning circuit to change the switching state.

[0228] Among them, S814, S815, S816, S817, S818, S819, S820 and S821 and Figure 12 The terms S710, S711, S712, S713, S714, S715, S716, and S717 are the same. For details, please refer to the textual descriptions of S710, S711, S712, S713, S714, S715, S716, and S717 and their related texts. They will not be repeated here.

[0229] Please see Figure 14 , Figure 14 This is a flowchart illustrating the fifth embodiment of the startup control method of this application. The startup control method of this embodiment... Figure 13 A detailed implementation diagram of the start-up control method is shown, which specifically includes the following steps:

[0230] S91: Generate a fourth control signal using the initial set frequency and minimum set pulse width.

[0231] Understandably, such as Figure 5 As shown, in the first stage 0-t1, the start-up control method can specifically correspond to a switch control with a set duty cycle and a set switching frequency, and the duration is a set value.

[0232] Specifically, the control sub-circuit 63 generates a fourth control signal using the initial set frequency Fs and the minimum set pulse width Dmin.

[0233] S92: The fourth control signal is continuously sent to the power conditioning circuit for a preset duration to trigger the power conditioning circuit to change the switching state, thereby adjusting the output current.

[0234] The fourth control signal is continuously sent to the second power supply regulation circuit 50 for a preset time, that is, to the first switch Q1 and the second switch Q2, until time t1, so as to trigger the first switch Q1 and the second switch Q2 to turn on or off, thereby regulating the output current Io.

[0235] S93: Obtain the circuit characteristic parameters of the power supply regulation circuit.

[0236] S94: Detect whether the output current is greater than the preset inflection point current.

[0237] S95: The minimum set pulse width is gradually increased using the third monotonic function to obtain the adjusted output pulse width.

[0238] S96: Generate a second control signal by adjusting the output pulse width.

[0239] S97: Send the second control signal to the power conditioning circuit to trigger the power conditioning circuit to change the switching state, thereby adjusting the output current.

[0240] S98: Obtain the current first output voltage and the second output voltage of the previous step of the power supply regulation circuit.

[0241] S99: Detect whether the difference between the first output voltage and the second output voltage is greater than the single-step voltage at the inflection point.

[0242] S910: The output pulse width is adjusted by using the minimum set pulse width.

[0243] S911: The minimum set pulse width is gradually increased using the fourth monotonic function to obtain the adjustable output pulse width.

[0244] S912: Detects whether the output pulse width is less than half of the minimum frequency limiting pulse width.

[0245] S913: Generates a third control signal by adjusting the output pulse width.

[0246] S914: Generates a third control signal using half of the minimum frequency-limiting pulse width.

[0247] S915: Sends the third control signal to the power conditioning circuit to trigger the power conditioning circuit to change the switching state, thereby regulating the output current.

[0248] S916: The feedback pulse width is adjusted using circuit characteristic parameters.

[0249] S917: The frequency limiting adjustment pulse width is obtained by gradually increasing the minimum frequency limiting pulse width by half using the first monotonic function.

[0250] S918: Detects whether the feedback adjustment pulse width is less than the frequency limiting adjustment pulse width.

[0251] S919: The first control signal is generated by adjusting the pulse width using frequency limiting.

[0252] S920: Detects whether the feedback adjustment pulse width is less than half of the minimum frequency limiting pulse width.

[0253] S921: The first control signal is generated by adjusting the pulse width using feedback.

[0254] S922: The first control signal is generated using half of the minimum frequency-limited pulse width.

[0255] S923: Sends the first control signal to the power conditioning circuit to trigger the power conditioning circuit to change the switching state.

[0256] Among them, S93, S94, S95, S96, S97, S98, S99, S910, S911, S912, S913, S914, S915, S916, S917, S918, S919, S920, S921, S921 and S923 and Figure 13 The terms S81, S82, S83, S84, S85, S86, S87, S88, S89, S810, S811, S812, S813, S814, S815, S816, S817, S818, S819, S820, and S821 are the same. For details, please refer to the textual descriptions of S81, S82, S83, S84, S85, S86, S87, S88, S89, S810, S811, S812, S813, S814, S815, S816, S817, S818, S819, S820, and S821 and their related texts, which will not be repeated here.

[0257] This application also provides an electronic device, please refer to... Figure 15 , Figure 15 This is a schematic diagram of the structure of an embodiment of the electronic device of this application. In this embodiment, the electronic device 100 includes a housing 1001 and a third start-up control circuit 1002 connected to the housing 1001.

[0258] It should be noted that the third start-up control circuit 1002 described in this embodiment is either the first start-up control circuit 20 or the second start-up control circuit 60 described in any of the above embodiments. Please refer to [link / reference] for details. Figures 1-14 The relevant textual content will not be elaborated upon here.

[0259] The beneficial effects of this application are as follows: Unlike the prior art, the start-up control method provided in this application obtains the feedback adjustment pulse width by utilizing the circuit characteristic parameters of the power supply regulation circuit, and gradually increases the minimum frequency limiting pulse width by half using a first monotonic function to obtain the frequency limiting adjustment pulse width. In response to the feedback adjustment pulse width being no less than the frequency limiting adjustment pulse width, the frequency limiting adjustment pulse width is selectively used to generate the first control signal to form a competition control between the frequency limiting output and the loop output. That is, the smaller of the frequency limiting adjustment pulse width and the feedback adjustment pulse width is selected to control the power supply regulation circuit, thereby effectively improving the monotonicity of the highest frequency modulation and the start-up stage of frequency modulation after modulation, making it closer to linear increase, and effectively avoiding the backtracking phenomenon of output drop.

[0260] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A start-up control method, applied to the start-up control of a power supply regulation circuit, characterized in that, The start-up control method includes: Obtain the circuit characteristic parameters of the power regulation circuit; The feedback adjustment pulse width is obtained using the circuit's characteristic parameters; The frequency limiting adjustment pulse width is obtained by gradually increasing the minimum frequency limiting pulse width by half using the first monotonic function; Detect whether the feedback adjustment pulse width is less than the frequency limiting adjustment pulse width; If the feedback adjustment pulse width is not less than the frequency limiting adjustment pulse width, a first control signal is generated using the frequency limiting adjustment pulse width; The first control signal is sent to the power conditioning circuit to trigger the power conditioning circuit to change the switching state.

2. The start-up control method according to claim 1, characterized in that, The startup control method further includes: If the feedback adjustment pulse width is less than the frequency limiting adjustment pulse width, detect whether the feedback adjustment pulse width is less than half of the minimum frequency limiting pulse width; If the feedback adjustment pulse width is not less than half of the minimum frequency limiting pulse width, the first control signal is generated using the feedback adjustment pulse width; If the feedback adjustment pulse width is less than half of the minimum frequency limiting pulse width, the first control signal is generated using half of the minimum frequency limiting pulse width.

3. The start-up control method according to claim 1, characterized in that, The step of generating the first control signal using the frequency limiting adjustment pulse width if the feedback adjustment pulse width is not less than the frequency limiting adjustment pulse width includes: If the feedback adjustment pulse width is not less than the frequency limiting adjustment pulse width, then detect whether the frequency limiting adjustment pulse width is less than half of the minimum frequency limiting pulse width; If the frequency limiting adjustment pulse width is not less than half of the minimum frequency limiting pulse width, the first control signal is generated using the frequency limiting adjustment pulse width; If the frequency limiting adjustment pulse width is less than half of the minimum frequency limiting pulse width, the first control signal is generated using half of the minimum frequency limiting pulse width.

4. The start-up control method according to claim 1, characterized in that, The circuit characteristic parameters include the output voltage, and the step of obtaining the feedback adjustment pulse width using the circuit characteristic parameters includes: The feedback adjustment pulse width is obtained by using the error value between the preset reference voltage and the output voltage; wherein, the preset reference voltage is gradually increased to the target reference voltage using a second monotonic function.

5. The start-up control method according to claim 4, characterized in that, The step of obtaining the feedback adjustment pulse width using the error value between the preset reference voltage and the output voltage includes: The error value is obtained by subtracting the output voltage from the preset reference voltage. Detect whether the error value is negative; If the error value is not negative, the feedback adjustment pulse width is obtained by proportional-integral adjustment of the error value.

6. The start-up control method according to claim 5, characterized in that, The startup control method further includes: If the error value is negative, the previous feedback adjustment pulse width is assigned the value of the feedback adjustment pulse width; or... Set the error value to zero; The feedback adjustment pulse width is obtained by proportional-integral adjustment over zero.

7. The start-up control method according to claim 1, characterized in that, The circuit characteristic parameters include resonant current and output voltage. The step of obtaining the feedback adjustment pulse width using the circuit characteristic parameters includes: The integral voltage is obtained by integral adjustment of the resonant current; The control output voltage is obtained using the output voltage and the preset reference voltage; The control output voltage is slope-compensated to obtain the feedback compensation voltage; The feedback adjustment pulse width is obtained by comparing the integral voltage with the feedback compensation voltage and by using a preset counting period.

8. The start-up control method according to any one of claims 1-7, characterized in that, The circuit characteristic parameters include the output current. Before the step of obtaining the feedback adjustment pulse width using the circuit characteristic parameters, the method further includes: Detect whether the output current is greater than the preset inflection point current; If the output current is greater than the preset inflection point current, the minimum set pulse width is gradually increased using the third monotonic function to obtain the adjusted output pulse width. The second control signal is generated by adjusting the output pulse width. The second control signal is sent to the power conditioning circuit to trigger the power conditioning circuit to change the switching state, thereby adjusting the output current.

9. The start-up control method according to claim 8, characterized in that, The startup control method further includes: If the output current is not greater than the preset inflection point current, obtain the current first output voltage and the previous second output voltage of the power supply regulation circuit; Detect whether the difference between the first output voltage and the second output voltage is greater than the inflection point single-step voltage; If the difference is greater than the inflection point single-step voltage, the adjusted output pulse width is obtained using the minimum set pulse width.

10. The start-up control method according to claim 9, characterized in that, The startup control method further includes: If the difference is not greater than the inflection point single-step voltage, the minimum set pulse width is gradually increased using a fourth monotonic function to obtain the adjusted output pulse width; wherein, the third monotonic function and the fourth monotonic function are arithmetic functions, and the common difference of the third monotonic function is greater than the common difference of the fourth monotonic function; or, the third monotonic function and the fourth monotonic function are linear functions, and the slope of the third monotonic function is greater than the slope of the fourth monotonic function.

11. The start-up control method according to claim 8, characterized in that, The step of gradually increasing the minimum set pulse width using a third monotonic function to obtain the adjusted output pulse width includes: In each switching cycle of the second control signal, the minimum set pulse width is gradually increased by the maximum adjustment value to obtain the adjusted output pulse width.

12. The start-up control method according to claim 10, characterized in that, The step of gradually increasing the minimum set pulse width using a fourth monotonic function to obtain the adjusted output pulse width includes: In each switching cycle of the second control signal, the minimum set pulse width is gradually increased using the minimum adjustment value to obtain the adjusted output pulse width.

13. The start-up control method according to claim 8, characterized in that, After the step of sending the second control signal to the power conditioning circuit to trigger the power conditioning circuit to change its switching state and thereby adjust the output current, and before the step of obtaining the feedback adjustment pulse width using the circuit characteristic parameters, the method further includes: Detect whether the adjusted output pulse width is less than half of the minimum frequency limiting pulse width; If the adjusted output pulse width is less than half of the minimum frequency limiting pulse width, a third control signal is generated using the adjusted output pulse width; The third control signal is sent to the power conditioning circuit to trigger the power conditioning circuit to change the switching state, thereby adjusting the output current.

14. The start-up control method according to claim 13, characterized in that, The startup control method further includes: If the feedback adjustment pulse width is not less than half of the minimum frequency limiting pulse width, the third control signal is generated using half of the minimum frequency limiting pulse width.

15. The start-up control method according to claim 8, characterized in that, Before the step of detecting whether the output current is greater than the preset inflection point current, the method further includes: A fourth control signal is generated using the initial set frequency and the minimum set pulse width; The fourth control signal is continuously sent to the power conditioning circuit for a preset duration to trigger the power conditioning circuit to change the switching state, thereby adjusting the output current.

16. A start-up control circuit, characterized in that, The start-up control circuit is coupled to the power supply regulation circuit. The power-on control circuit uses the power-on control method as described in any one of claims 1-15 to control the power supply regulation circuit.

17. An electronic device, characterized in that, The electronic device includes a housing and a start-up control circuit connected to the housing; The start-up control circuit is the start-up control circuit as described in claim 16.

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