Power supply start control circuit and control method, electronic equipment

Abstract

The present application discloses a power supply startup control circuit and control method, and an electronic device, wherein the power supply startup control circuit includes: a first power conversion circuit, a resonant circuit, a second power conversion circuit, and a main control circuit; the main control circuit is configured to: in the second startup stage, obtain a resonant current signal and a power supply output signal, so that when the power supply output signal is not greater than a target reference voltage, a first slope compensation slope is used to slope compensate the regulated output signal obtained by using the difference between the power supply output signal and the target reference voltage to obtain a first feedback regulation signal, and a second control signal is generated by using the first feedback regulation signal and the resonant current signal; the target reference voltage increases linearly in the second startup stage; the first power conversion circuit receives and sequentially uses the first control signal and the second control signal to regulate the first AC signal of its converted output. In the above manner, the power supply startup control circuit of the present application can effectively achieve smoother startup control.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a power supply startup control circuit and control method, and electronic equipment. Background Art

[0002] With the continuous miniaturization and informatization of electronic equipment, the demand for high-frequency switching power supplies is growing. High-frequency operation can greatly reduce the volume of passive components such as transformers and capacitors, but it also brings about an increase in switching losses. In order to increase the power density of the power supply and reduce the volume and weight, it is necessary to increase the switching frequency and reduce the switching losses. Among them, the LLC resonant converter (which contains an additional inductance (L) in series with the other two components, the inductor L and the capacitor (C), hence the name LLC converter) can effectively reduce switching losses and allow high-frequency operation, and is usually used in efficient and reliable power supply systems.

[0003] However, the traditional LLC resonant converter has certain limitations in the details of startup control, such as large slope compensation depth, insufficient loop gain, and small slope compensation depth, which easily cause problems such as large starting current and poor monotonicity, thereby limiting the performance of the LLC resonant converter in certain application scenarios. Summary of the invention

[0004] The main technical problem solved by the present application is to provide a power supply start-up control circuit and control method, and electronic equipment, which can solve the problems that the LLC resonant converter in the prior art has certain limitations in the details of the start-up control, such as large slope compensation depth, insufficient loop gain, and small slope compensation depth, which easily cause large starting current and poor monotonicity, thereby limiting the performance of the LLC resonant converter in certain application scenarios.

[0005] In order to solve the above technical problems, a technical solution adopted by the present application is: to provide a power supply startup control circuit, wherein the power supply startup control circuit includes: a first power conversion circuit, used to receive a power supply input signal to convert the power supply input signal into a first AC signal; a resonant circuit, coupled to the first power conversion circuit, to receive the first AC signal sent by the first power conversion circuit, and adjust the first AC signal to a resonant current signal; a second power conversion circuit, coupled to the resonant circuit, and used to couple with the load circuit to receive the resonant current signal sent by the resonant circuit, and convert the resonant current signal into a power output signal to output to the load circuit; a main control circuit, coupled to the first power conversion circuit, the resonant circuit and the second power conversion circuit, the main control circuit is configured as: in the first In a startup phase, a first control signal having a first signal frequency is generated; in a second startup phase, a resonant current signal in the resonant circuit and a power output signal in the second power conversion circuit are obtained, and a regulated output signal is obtained using the difference between the power output signal and a target reference voltage, in response to the power output signal being less than or equal to the target reference voltage, a first slope compensation slope is used to perform slope compensation on the regulated output signal to obtain a first feedback regulation signal, so as to generate a second control signal using the first feedback regulation signal and the resonant current signal; wherein, the target reference voltage increases linearly in the second startup phase; the first power conversion circuit is used to receive the first control signal and the second control signal sent sequentially by the main control circuit, so as to regulate the first AC signal using the first control signal and the second control signal.

[0006] The main control circuit is configured to: in the second startup phase, in response to the power output signal being greater than the target reference voltage, not send the second control signal to the first power conversion circuit.

[0007] Among them, the main control circuit is configured as follows: when it is determined that the power supply output signal is greater than or equal to the set voltage threshold, it enters the third startup stage, and uses the second slope compensation slope to perform slope compensation on the regulated output signal to obtain a second feedback regulation signal, and uses the second feedback regulation signal and the resonant current signal to generate a third control signal; the first power conversion circuit is also used to receive the third control signal and use the third control signal to regulate the first AC signal.

[0008] The second slope compensation slope is equal to the first slope compensation slope; and the voltage threshold is set to 50%-70% of the target output voltage corresponding to the power supply output signal.

[0009] Among them, the power supply startup control circuit also includes a resonant current integration circuit, which couples the resonant circuit and the main control circuit to obtain the resonant current signal in the resonant circuit and adjust the resonant current signal to an integrated voltage signal; wherein the main control circuit is configured to: in the second startup stage, receive the integrated voltage signal sent by the resonant current integration circuit to generate a second control signal using the first feedback adjustment signal and the integrated voltage signal.

[0010] The first power conversion circuit includes a first switch subcircuit and a second switch subcircuit, the first switch subcircuit is coupled to the second switch subcircuit, the resonant circuit and the main control circuit, the second switch subcircuit is coupled to the main control circuit, and the second control signal includes a first drive signal and a second drive signal; in the second startup stage, the main control circuit is configured to: in the first half cycle of the second signal cycle of each second control signal, in response to the power output signal being less than or equal to the target reference voltage, or the second drive signal being adjusted from the first level to the second level, delay a set time length or simultaneously use a first slope compensation slope to perform slope compensation on the feedback adjustment signal to obtain a first feedback adjustment signal, and delay a set time length or simultaneously adjust the first drive signal from the second level to the first level, so that when the voltage amplitude of the first feedback adjustment signal is equal to the voltage amplitude of the integrated voltage signal, the first drive signal is adjusted from the first level to the second level; in the second half cycle of each second signal cycle, copy the first drive signal of each first half cycle to obtain the second drive signal; the first switch subcircuit and the second switch subcircuit are respectively used to receive the first drive signal and the second drive signal, and change the switch state under the action of the first drive signal and the second drive signal respectively to adjust the first AC signal.

[0011] The resonant circuit includes a first resonant capacitor, a second resonant capacitor and a resonant inductor, the resonant current integration circuit includes a current transformer and an integration sampling capacitor, the first end of the first resonant capacitor is coupled to the first end of the first switch subcircuit, the second end of the first resonant capacitor is coupled to the first end of the second resonant capacitor and the first end of the current transformer, the second end of the second resonant capacitor is coupled to the second end of the second switch subcircuit, the second end of the current transformer is coupled to the second end of the second power conversion circuit, the first end of the resonant inductor is coupled to the second end of the first switch subcircuit and the first end of the second switch subcircuit, the second end of the resonant inductor is coupled to the first end of the second power conversion circuit, the third end of the current transformer is coupled to the first end of the integration sampling capacitor and the first end of the main control circuit, and the fourth end of the current transformer is coupled to the second end of the integration sampling capacitor and the second end of the main control circuit; wherein the main control circuit is used to sample and obtain the voltage between the first end and the second end of the integration sampling capacitor to obtain an integrated voltage signal.

[0012] In order to solve the above technical problems, another technical solution adopted in the present application is: to provide a power supply startup control method, which includes: receiving a power supply input signal; converting the power supply input signal into a first AC signal; adjusting the first AC signal into a resonant current signal; converting the resonant current signal into a power supply output signal to output to an external load circuit; in a first startup stage, generating a first control signal with a first signal frequency; adjusting the first AC signal using the first control signal; in a second startup stage, obtaining an adjusted output signal using the difference between the power supply output signal and a target reference voltage; wherein the target reference voltage increases linearly in the second startup stage; detecting whether the power supply output signal is greater than the target reference voltage; if the power supply output signal is not greater than the target reference voltage, using a first slope compensation slope to perform slope compensation on the adjusted output signal to obtain a first feedback adjustment signal; generating a second control signal using the first feedback adjustment signal and the resonant current signal; and adjusting the first AC signal using the second control signal.

[0013] The power startup control method further includes: in the second startup stage, if the power output signal is greater than the target reference voltage, not using the second control signal to adjust the first AC signal.

[0014] Among them, after the step of using the second control signal to adjust the first AC signal, it also includes: when the power supply output signal is greater than or equal to the set voltage threshold, entering the third startup stage, using the second slope compensation slope to perform slope compensation on the adjusted output signal to obtain a second feedback adjustment signal; using the second feedback adjustment signal and the resonant current signal to generate a third control signal; using the third control signal to adjust the first AC signal.

[0015] Wherein, in the second startup stage, after the step of obtaining the regulated output signal by using the difference between the power supply output signal and the target reference voltage, it is detected that the power supply output signal is less than or equal to the target reference voltage; wherein, before the step of the target reference voltage linearly increasing in the second startup stage, it also includes: detecting whether the second signal frequency of the pre-control signal obtained by using the regulated output signal corresponding to the starting moment of the second startup stage is less than the maximum resonant frequency of the resonant circuit; if the second signal frequency is not less than the maximum resonant frequency of the resonant circuit, slope compensation is performed on the regulated output signal using the first slope compensation slope to obtain a first feedback regulated signal; if the second signal frequency is less than the maximum resonant frequency of the resonant circuit, it is detected whether the power supply output signal is not greater than the target reference voltage.

[0016] Among them, the second control signal includes a first drive signal and a second drive signal, and the step of using the first slope compensation slope to perform slope compensation on the regulated output signal to obtain the first feedback regulation signal includes: in the first half cycle of the second signal cycle of each second control signal, in response to the power supply output signal being less than or equal to the target reference voltage, or the second drive signal is adjusted from the first level to the second level, delaying the feedback regulation signal for a set time or simultaneously using the first slope compensation slope to perform slope compensation to obtain the first feedback regulation signal; the step of using the first feedback regulation signal and the resonant current signal to generate the second control signal includes: delaying the first time or simultaneously adjusting the first drive signal from the second level to the first level; when the voltage amplitude of the first feedback regulation signal is equal to that of the integrated voltage signal, adjusting the first drive signal from the first level to the second level; in the second half cycle of each second signal cycle, copying the first drive signal of each first half cycle to obtain the second drive signal; the step of using the second control signal to regulate the first AC signal includes: using the first drive signal and the second drive signal to regulate the first AC signal.

[0017] To solve the above technical problems, another technical solution adopted in the present application is: to provide an electronic device, wherein the electronic device includes a shell and a power start control circuit connected to the shell; wherein the power start control circuit is a power start control circuit as described in any of the above items.

[0018] The beneficial effects of the present application are as follows: Different from the prior art, the first power conversion circuit in the power startup control circuit provided by the present application is used to receive a power input signal to convert the power input signal into a first AC signal; the resonant circuit receives the first AC signal sent by the first power conversion circuit and adjusts the first AC signal into a resonant current signal; the second power conversion circuit is used to couple with the load circuit to receive the resonant current signal sent by the resonant circuit and convert the resonant current signal into a power output signal to output to the load circuit; the main control circuit is configured to: in a first startup phase, generate a first control signal with a first signal frequency, and in a second startup phase, obtain the resonant current signal and the power output signal, and obtain an adjustment output signal using the difference between the power output signal and the target reference voltage, in response to the power output signal being less than or equal to the target reference voltage, use a first slope compensation slope to perform slope compensation on the adjustment output signal to obtain a first feedback adjustment signal, so as to generate a second control signal using the first feedback adjustment signal and the resonant current signal signal; wherein, the target reference voltage increases linearly in the second startup stage; the first power conversion circuit is used to receive the first control signal and the second control signal sent in sequence by the main control circuit, so as to use the first control signal and the second control signal to adjust the first AC signal, so that in the initial stage of the power startup control circuit starting operation, that is, in the initial stage of receiving the power input signal, different control strategies are adopted in different startup stages to timely suppress the instantaneous impact current to avoid loss to the circuit; and in the first startup stage, open-loop control is adopted to make the resonant cavity current sinusoidal, and in the second startup stage, slope compensation control is adopted in the interval where the power output signal is less than or equal to the target reference voltage, which effectively solves the problems of large starting current and poor monotonicity, so as to achieve smoother startup control, and while suppressing the instantaneous impact current, it also effectively guarantees the better gain effect of the resonant circuit, improves the loop amplitude gain, increases the amplitude domain, and enhances the dynamic performance, thereby ensuring better performance in a wider range of application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0020] Figure 1 It is a structural schematic diagram of the first embodiment of the power supply startup control circuit of the present application;

[0021] Figure 2 yes Figure 1 A schematic diagram of a voltage waveform of an embodiment of a power output signal in a second power conversion circuit;

[0022] Figure 3 yes Figure 1 A schematic diagram of a waveform of a first control signal sent by the main control circuit in the first startup phase;

[0023] Figure 4 yes Figure 1 A waveform diagram of a second control signal sent by the main control circuit in the second startup phase when the power output signal is less than or equal to the target reference voltage;

[0024] Figure 5 yes Figure 1 A waveform diagram of a second control signal sent by the main control circuit in the second startup phase when the power output signal is greater than the target reference voltage;

[0025] Figure 6 It is a structural schematic diagram of a second embodiment of the power supply startup control circuit of the present application;

[0026] Figure 7 It is a structural schematic diagram of a third embodiment of the power startup control circuit of the present application;

[0027] Figure 8 It is a flowchart of the first implementation method of the power startup control method of the present application;

[0028] Fig. 9 It is a flow chart of the second implementation mode of the power startup control method of the present application;

[0029] Fig.10 It is a flowchart of the third implementation method of the power startup control method of the present application;

[0030] Fig.11 It is a flowchart of a fourth embodiment of the power startup control method of the present application;

[0031] Fig.12 It is a schematic diagram of the framework of an implementation scheme of the electronic device of the present application. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] The terms "first", "second" and "third" in this application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second" and "third" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. All directional indications (such as up, down, left, right, front, back...) in the implementation mode of this application are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. 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 optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0034] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0035] The present application is described in detail below with reference to the accompanying drawings and implementation methods.

[0036] See also Figure 1 , Figure 1 1 is a schematic diagram of the structure of the first embodiment of the power startup control circuit of the present application. In this embodiment, the power startup control circuit 10 includes: a first power conversion circuit 11, a resonant circuit 12, a second power conversion circuit 13 and a main control circuit 14.

[0037] Among them, a power start control circuit 10 provided in the present application is specifically used in the power supply of power loads, utilizing an externally provided power input signal, and performing corresponding adjustment and control on the power input signal to obtain a power output signal, which is then provided to power loads in any reasonable electronic equipment such as servers, computers, and intelligent communication devices for operation, and this embodiment does not impose any restrictions on this.

[0038] Specifically, the first power conversion circuit 11 is used to receive a power input signal, and utilize its internal switching action mechanism, such as the opening and closing action mechanism of switching devices such as IGBT (Insulated Gate Bipolar Transistor), high-frequency transistor, MOSFET (Metal Oxide Semiconductor Field Effect Transistor), etc., to quickly switch direct current or alternating current under signal control to generate an alternating voltage waveform and obtain a first alternating current signal.

[0039] It is worth noting that the power input signal can be specifically understood as an external DC power supply, or a power input provided by an AC power supply, and can also be understood as a secondary power supply output after power conversion and adjustment of a municipal power supply, a photovoltaic power supply, an independent generator or any other reasonable superior AC or DC power supply.

[0040] In addition, the term "coupled" herein refers to any direct and indirect connection means. Therefore, if the first circuit is described as being coupled to the second circuit, it means that the first circuit can be directly connected to the second circuit through electrical connection or signal connection methods such as wireless transmission, optical transmission, etc., or can be indirectly connected to the second circuit through other circuits or connection means.

[0041] The resonant circuit 12 is directly connected to the first power conversion circuit 11 to receive the first AC signal sent by the first power conversion circuit 11, and performs one or more of any reasonable signal adjustments such as filtering, shaping, phase shifting, etc. on the first AC signal to obtain a resonant current signal, so as to achieve better output characteristics and ensure that subsequent links, such as the power conversion circuit or the load, obtain more stable and efficient electric energy.

[0042] The second power conversion circuit 13 is coupled to the resonant circuit 12 to receive the resonant current signal sent by the resonant circuit 12, and performs power conversion and regulation control on the resonant current signal to obtain a stable power output, that is, a power output signal, which is then output to the load circuit 101 to meet the power usage of the load circuit 101.

[0043] The load circuit 101 can be understood as a signal function circuit that utilizes the DC output of the power startup control circuit 10 to operate.

[0044] Furthermore, the main control circuit 14 is coupled to the first power conversion circuit 11, the resonant circuit 12 and the second power conversion circuit 13. The main control circuit 14 is specifically configured to generate a first control signal with a first signal frequency based on a preset program in the first startup phase.

[0045] It is worth noting that the first startup stage can be specifically understood as the initial stage in which the power startup control circuit 10 receives the power input signal input to start the operation. For the convenience of quantification, the output voltage of the power output signal Vo provided by the second power conversion circuit 13 to the load circuit 101 can be specifically divided into time intervals during which the output voltage of the power output signal Vo provided by the second power conversion circuit 13 rises from 0V (volts) to the target output voltage Vobj and stabilizes at the target output voltage Vobj to obtain the first startup stage and the second startup stage.

[0046] For details, please continue to see Figure 2 and Figure 3 ,in, Figure 2 yes Figure 1 A schematic diagram of a voltage waveform of an embodiment of a power output signal in the second power conversion circuit, Figure 3 yes Figure 1 A schematic diagram of the waveform of the first control signal sent by the main control circuit in the first startup stage.

[0047] It is understandable that the first startup stage can specifically correspond to the output voltage of the power output signal Vo rising from 0V to the target output voltage Vobj and stabilizing at the target output voltage Vobj during the entire operation process, according to the T0-T1 time period determined by a preset duration, or according to the T0-T1 time period corresponding to the output voltage of the power output signal Vo rising from 0V to a preset voltage value, and the present application does not limit this.

[0048] Among them, in the initial stage when the power supply startup control circuit 10 receives the power supply input signal input, there is usually an instantaneous impact current. The first signal frequency can be specifically understood as the control of the first power conversion circuit 11 through the first control signal, which can effectively suppress the instantaneous impact current currently received by the first power conversion circuit 11 in time and the corresponding pre-set signal frequency of the first control signal. This application does not limit this.

[0049] It is worth noting that the Figure 2 , Figure 3 And subsequent Figure 4 and Figure 5 What is shown is the waveform change trend of each signal over time, so the specific coordinate unit is not given.

[0050] Please continue reading Figure 4 , Figure 4 yes Figure 1 A waveform diagram of a second control signal sent by the main control circuit in the second startup phase when the power output signal is less than or equal to the target reference voltage.

[0051] It can be understood that in the second startup stage, that is, during the entire process in which the output voltage based on the power supply output signal Vo rises from 0V to the target output voltage Vobj and stabilizes at the target output voltage Vobj, after the first startup stage, in the T1-T2 time period obtained by division, the main control circuit 14 is configured to obtain the resonant current signal from the resonant circuit 12 and the power supply output signal in the second power conversion circuit 13.

[0052] In the second startup stage, the main control circuit 14 specifically adopts a voltage loop control strategy, or a PI (proportional integral) controller uses the difference between the power output signal and the target reference voltage, that is, the difference between the set value and the feedback value to obtain a specific output signal for realizing signal regulation, that is, a regulation output signal. Then, when it is determined that the current power output signal is less than or equal to the target reference voltage, the regulation output signal is slope compensated by using a first slope compensation slope to generate a first feedback regulation signal.

[0053] The target reference voltage increases linearly in the second startup phase, that is, its voltage amplitude changes with time in a preset linear function; and the first feedback adjustment signal includes the adjustment output signal and the signal information after slope compensation. The main control circuit 14 compares the first feedback adjustment signal with the resonant current signal to generate a second control signal based on the difference between the two.

[0054] The main control circuit 14 is also used to send a second control signal to the first power conversion circuit 11 to adjust the switching state of the first power conversion circuit 11, thereby adjusting the operation of the resonant circuit 12 so that the actual resonant current is as close as possible to the desired set value, and adjust the first AC signal.

[0055] It is worth noting that the target reference voltage can be specifically understood as the power supply output signal monotonically and linearly increasing from 0 to the target output voltage Vobj under theoretical conditions during the entire startup phase, and stabilizing at the changing voltage amplitude of the target output voltage Vobj; or, the voltage amplitude that increases linearly in the second startup phase.

[0056] In addition, the slope compensation is a control technology used to improve the stability of the system and reduce the steady-state error. By superimposing a slope-controllable ramp signal on the set voltage signal, the dynamic response characteristics of the system can be changed. Among them, the first slope compensation slope refers to the slope parameter used for slope compensation. This slope can be adjusted according to the needs of the system to achieve the optimal compensation effect.

[0057] In some embodiments, the first control signal and the second control signal may specifically be one or more of any reasonable control signals such as a PWM (Pulse Width Modulation) signal or a PFM (Pulse Frequency Modulation) signal, and the present application does not limit this.

[0058] In some embodiments, the main control circuit 14 may specifically include a control chip, an MCU (Micro Controller Unit) circuit, a CPU (Central Processing Unit), a single-chip microcomputer, a field programmable gate array, a programmable logic device, a discrete gate or transistor logic device, discrete hardware, or any other reasonable circuit unit with a signal processing function, and the present application does not limit this.

[0059] The above scheme adopts different control strategies in different startup stages to timely suppress instantaneous impact current in the initial stage of the power supply startup control circuit 10 starting operation, that is, in the initial stage of receiving the power supply input signal, so as to avoid loss to the circuit; and adopts open-loop control in the first startup stage to make the resonant cavity current sinusoidal, and in the second startup stage, by adopting slope compensation control in the interval where the power supply output signal is less than or equal to the target reference voltage, it effectively solves the problems of large starting current and poor monotonicity, so as to achieve smoother startup control, and while suppressing instantaneous impact current, it also effectively guarantees the better gain effect of the resonant circuit 12, improves the loop amplitude gain, increases the amplitude range, and enhances the dynamic performance, thereby ensuring better performance in a wider range of application scenarios.

[0060] Please continue reading Figure 5 , Figure 5 yes Figure 1 A waveform diagram of a second control signal sent by the main control circuit in the second startup phase when the power output signal is greater than the target reference voltage.

[0061] In some embodiments, the main control circuit 14 is also specifically used for not sending the second control signal to the first power conversion circuit 11 in the second startup stage when it is determined that the power output signal is greater than the target reference voltage, that is, the first power conversion circuit 11 will not receive the drive control signal, so that each switch sub-circuit inside it is in the off state, and it can be specifically understood that when the power output signal is greater than the target reference voltage, the control of the first power conversion circuit 11 by the main control circuit 14 will be converted into a BURST control mode, so as to use the PWM dead zone module to eliminate the actual PWM wave of the drive, that is, the actual wave of the second control signal will be zero.

[0062] It is worth mentioning that the BURST control mode refers to controlling the synchronous rectification switch to work continuously for several cycles and then shut down for several cycles according to the load conditions, thereby effectively reducing the switching loss in the converter system and reducing the static power consumption. Therefore, in the converter system, the BURST control mode is an efficient energy-saving mode under light load conditions.

[0063] In addition, the main function of the dead zone module is that within a certain range of the input signal, the output signal is zero. When the input signal exceeds this range, the output signal is linearly related to the input signal.

[0064] In summary, if Figure 2 , Figure 4 , Figure 5 As shown, in the second startup stage, that is, the T1-T2 time stage, the main control circuit 14 is specifically in the BURST control mode when the power output signal is greater than the target reference voltage, and does not send the second control signal to the first power conversion circuit 11; and when the power output signal is less than or equal to the target reference voltage, the first slope compensation slope is used to perform slope compensation on the regulated output signal to obtain a first feedback regulation signal, so as to generate a second control signal using the first feedback regulation signal and the resonant current signal, and then use the second control signal to adjust the switching state of the first power conversion circuit 11 to adjust the first AC signal, so as to facilitate the distinction and identify it as a compensation regulation control mode.

[0065] It is understandable that different waveform frequencies of the first AC signal will correspond to different resonant states and gain effects of the resonant circuit 12, so that in the second startup stage, by responding to whether the power supply output signal is greater than the target reference voltage, the BURST control mode and the compensation adjustment control mode can be flexibly switched to control the first power conversion circuit 11, thereby effectively obtaining a better gain effect of the resonant circuit 12, effectively ensuring a better gain effect of the resonant circuit 12, and improving the loop amplitude gain, so that the amplitude range is increased and the dynamic performance is enhanced, thereby ensuring better performance in a wider range of application scenarios.

[0066] Furthermore, in one embodiment, the main control circuit 14 is specifically used to enter the third startup stage when it is determined that the power supply output signal is greater than or equal to the set voltage threshold, that is, after time T2, use the second slope compensation slope to perform slope compensation on the regulated output signal to obtain a second feedback regulation signal, and then use the second feedback regulation signal and the resonant current signal to generate a third control signal.

[0067] The first power conversion circuit 11 is specifically further configured to receive a third control signal, and use the third control signal to adjust the first AC signal so as to adjust the resonance state of the resonance circuit 12 .

[0068] It can be seen that in the third startup stage, the main control circuit 14 specifically continues to use the second slope compensation slope adjustment output signal to perform slope compensation to obtain the second feedback adjustment signal, that is, continues to maintain the compensation adjustment control mode, and uses the third control signal generated by the second feedback adjustment signal and the resonant current signal, and uses the third control signal to adjust the switching state of the first power conversion circuit 11, and no longer enters the BURST control mode.

[0069] In some embodiments, the second slope compensation slope may be equal to or not equal to the first slope compensation slope; the set voltage threshold may be 50%-70% of the target output voltage corresponding to the power supply output signal, which is not limited in the present application.

[0070] The above scheme creatively solves the problems of large starting current and poor monotonicity through three-stage starting control, so as to achieve smoother starting control. While suppressing instantaneous impact current, it also effectively ensures a better gain effect of the resonant circuit 12, improves the loop amplitude gain, increases the amplitude range, and enhances the dynamic performance, thereby ensuring better performance in a wider range of application scenarios.

[0071] In some embodiments, the first signal frequency of the first control signal generated by the main control circuit 14 in the first startup phase may be 90%-100% of the maximum resonance frequency of the resonance circuit 12, which is not limited in the present application.

[0072] It is worth noting that the resonant circuit 12 is a circuit that can selectively amplify and transmit signals. It can maximize the amplitude of signals at a specific frequency while suppressing interference signals at other frequencies. This circuit is widely used in wireless communication systems, sound amplification, video processing and other fields, and its main functions are: 1. Signal amplification: The resonant circuit 12 can maximize the amplitude of signals at a specific frequency, thereby amplifying them. For example, the amplifier used in the radio works based on the resonance principle. 2. Signal enhancement: The resonant circuit 12 can enhance the signal within a specified frequency range through selective amplification, thereby improving signal quality and transmission efficiency. 3. Signal selection: The resonant circuit 12 can selectively transmit signals of a specific frequency, suppress interference signals of other frequencies, and ensure signal clarity.

[0073] The physical characteristics of the resonant circuit 12 itself will determine a maximum resonant frequency and a minimum resonant frequency; the first control signal can specifically be a PFM signal with a fixed duty cycle of 50%, so that in the first startup stage, that is, the starting stage when the instantaneous impact current input to the power startup control circuit 10 is relatively large, by setting the first control signal to the maximum resonant frequency or close to the maximum resonant frequency, the instantaneous impact current can be suppressed in time to avoid loss to the circuit.

[0074] The duration of the first startup phase may specifically be a set multiple m of the first signal period of the first control signal, that is, the duration of T0-T1 is m*1 / f, where m is a positive integer and f is the signal frequency of the first control signal.

[0075] In some embodiments, the set multiple m can specifically be 1-100, which is not limited in this application.

[0076] See also Figure 6 , Figure 6 The power start control circuit in this embodiment differs from the first embodiment of the power start control circuit provided in this application in that the power start control circuit 20 specifically further includes a resonant current integration circuit 25 .

[0077] Specifically, the resonant current integration circuit 25 is coupled to the resonant circuit 22 and the main control circuit 24 to sample and obtain the resonant current signal in the resonant circuit 22 and adjust the resonant current signal to obtain an integrated voltage signal.

[0078] Specifically, the main control circuit 24 can also receive the integrated voltage signal sent by the resonant current integration circuit 25 in the second startup phase, and generate a second control signal using the first feedback adjustment signal and the integrated voltage signal to ensure the stability and reliability of the second control signal.

[0079] In one embodiment, the first power conversion circuit 21 further includes a first switch sub-circuit 211 and a second switch sub-circuit 212, the first switch sub-circuit 211 is coupled to the second switch sub-circuit 212, the resonant circuit 22 and the main control circuit 24, the second switch sub-circuit 212 is coupled to the main control circuit 24, and the second control signal includes a first drive signal PWMA and a second drive signal PWMB.

[0080] Among them, Figure 4 As shown, in the second startup stage, the main control circuit 24 is specifically used to, in the first half cycle of the second signal cycle of each second control signal, respond to the power output signal being less than or equal to the target reference voltage, or the moment when each second drive signal PWMB is adjusted from the first level to the second level, and at the same time use the first slope compensation slope to perform slope compensation on the feedback adjustment signal to obtain the first feedback adjustment signal, and delay for a set time or adjust the first drive signal PWMA from the second level to the first level at the same time, so as to adjust the first drive signal PWMA from the first level to the second level when the voltage amplitude of the first feedback adjustment signal is equal to the voltage amplitude of the integrated voltage signal.

[0081] In other embodiments, the main control circuit 24 can also use the first slope compensation slope to perform slope compensation on the set voltage signal to obtain a first feedback adjustment signal after a delay of a set time at each moment when the second drive signal PWMB is adjusted from the first level to the second level. The present application does not limit this.

[0082] It is worth noting that the main control circuit 24 uses the first slope compensation slope to perform slope compensation on the set voltage signal when each second drive signal PWMB is adjusted from the first level to the second level. This is different from the first slope compensation slope corresponding to the first slope compensation slope used to perform slope compensation on the set voltage signal with the delay setting time when each second drive signal PWMB is adjusted from the first level to the second level. The first slope compensation slope used for delay is smaller than the first slope compensation slope used for no delay, which is specifically determined by the actual application scenario and is not limited in this application.

[0083] Furthermore, in the second half of each second signal cycle, the main control circuit 24 can directly copy the first drive signal PWMA of each first half of the cycle to obtain the second drive signal PWMB.

[0084] It is understandable that if Figure 4 As shown, in the first half of each second signal cycle, specifically, the first drive signal PWMA has a first level state, and in the second half of each second signal cycle, the first drive signal PWMA continues to be a second level state; and the second drive signal PWMB continues to be the second level state in the first half of each second signal cycle, and in the second half of each second signal cycle, the level change state of the first drive signal PWMA in the first half of each second signal cycle is adjusted and copied to obtain the level change state of the second drive signal PWMB.

[0085] In some embodiments, the set duration may specifically be the on-off dead time of each switch tube in the first power conversion circuit 21, or may be a specific duration determined according to a specific application scenario, which is not limited in the present application.

[0086] In some embodiments, the first level can be a high level, and the second level corresponds to a low level or a 0 level; or, the first level can be a low level or a 0 level, and the second level corresponds to a high level, which can be specifically determined by the physical characteristics of each switching tube in the first power conversion circuit 21, and the present application does not limit this.

[0087] Furthermore, the first switch sub-circuit 211 and the second switch sub-circuit 212 are used to receive the first drive signal PWMA and the second drive signal PWMB, so as to change the switch state under the action of the first drive signal PWMA and the second drive signal PWMB respectively, thereby regulating the first AC signal to adjust the resonant state of the resonant circuit 22.

[0088] It is understandable that, in this embodiment, the resonant circuit 22, the second power conversion circuit 23 and the main control circuit 24 are respectively the same as the resonant circuit 12, the second power conversion circuit 13 and the main control circuit 14. For details, please refer to Figure 1-5 And the related text content will not be repeated here.

[0089] See also Figure 7 , Figure 7 The power start control circuit in this embodiment is different from the second embodiment of the power start control circuit provided in this application in that the resonant circuit 32 in the power start control circuit 30 further includes a first resonant capacitor Cr1, a second resonant capacitor Cr2 and a resonant inductor Lr.

[0090] The resonant current integration circuit 35 specifically also includes a current transformer CT and an integration sampling capacitor CJ, the first end of the first resonant capacitor Cr1 is coupled to the first end of the first switch sub-circuit 311, the second end of the first resonant capacitor Cr1 is coupled to the first end of the second resonant capacitor Cr2 and the first end of the current transformer CT, the second end of the second resonant capacitor Cr2 is coupled to the second end of the second switch sub-circuit 312, the second end of the current transformer CT is coupled to the second end of the second power conversion circuit 33, the first end of the resonant inductor Lr is coupled to the second end of the first switch sub-circuit 311 and the first end of the second switch sub-circuit 312, the second end of the resonant inductor Lr is coupled to the first end of the second power conversion circuit 33, the third end of the current transformer CT is coupled to the first end of the integration sampling capacitor CJ and the first end of the main control circuit 34, and the fourth end of the current transformer CT is coupled to the second end of the integration sampling capacitor CJ and the second end of the main control circuit 34.

[0091] The main control circuit 34 is specifically used to sample and obtain the voltage between the first terminal and the second terminal of the integral sampling capacitor CJ to obtain an integral voltage signal.

[0092] In one embodiment, the power supply start-up control circuit 30 specifically also includes a switch freewheeling circuit 37, which 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 first switch sub-circuit 311 includes a first switch tube Q1, and the second switch sub-circuit 312 includes a second switch tube Q2.

[0093] Among them, the first end of the first freewheeling resistor Rc1 is coupled to the first end of the first switch tube Q1 and the second end of the first diode D1, the second end of the first freewheeling resistor Rc1 is coupled to the first end of the first freewheeling capacitor C1, the second end of the first freewheeling capacitor C1 is coupled to the first end of the first diode D1, the second end of the first switch tube Q1, the first end of the second switch tube Q2, the first end of the second freewheeling resistor Rc2, and the second end of the second diode D2, the second end of the second freewheeling resistor Rc2 is coupled to the first end of the second freewheeling capacitor C2, the second end of the second freewheeling capacitor C2 is coupled to the second end of the second switch tube Q2 and the first end of the second diode D2, and the third end of the first switch tube Q1 and the third end of the second switch tube Q2 are coupled to the main control circuit 34.

[0094] Optionally, the first switch tube Q1 and the second switch tube Q2 may be specifically a MOS tube, a triode, a thin film transistor, a field effect transistor or any other reasonable switch tube, which is not limited in the present application.

[0095] It is worth noting that, in order to distinguish the two ends of each switch tube except the control end, one of the ends is called the first end and the other end is called the second end. When each switch tube is a triode, the control end, that is, the third end, can be specifically the base, the first end is the collector, and the second end is the emitter; or, the third end can also be specifically the base, the first end is the emitter, and the second end is the collector.

[0096] When the above switch tubes are MOS tubes, thin film transistors or field effect transistors, the third end can be a gate, the first end is a drain, and the second end is a source; or, the third end can be a gate, the first end is a source, and the second end is a drain.

[0097] When each switch tube is a MOS tube, 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 the present application.

[0098] In other embodiments, the first power conversion circuit 31 can be a full-bridge circuit, a symmetrical half-bridge circuit, an asymmetrical half-bridge circuit, or any other reasonable circuit form for converting DC to AC, and the present application does not limit this.

[0099] It can be understood that by setting the switch freewheeling circuit 37, when the first switch tube Q1 or the second switch tube Q2 is triggered to turn off, the first diode D1 or the second diode D2 can be used to provide a freewheeling channel for the current flowing through the first switch tube Q1 or the second switch tube Q2, and with the help of the first freewheeling resistor Rc1, the second freewheeling resistor Rc2, the first freewheeling capacitor C1, and the second freewheeling capacitor C2, the ZVS (Zero Voltage Switch) is effectively turned on and off, thereby effectively ensuring the efficient and stable power supply performance of the entire power supply start-up control circuit 30.

[0100] It is worth mentioning that ZVS turn-on is a soft switching technology commonly used in switching power supplies. It achieves zero voltage turn-on by reducing the voltage to zero before the switch tube is turned on, so as to reduce switching losses and electromagnetic interference.

[0101] In one embodiment, the power start-up control circuit 30 specifically also includes a power factor correction circuit 36, which is coupled to the first power conversion circuit 31 and is used to couple with the AC power supply 102 to receive an AC input signal from the AC power supply 102, and convert the input AC input signal into a smooth, highly stable power input signal Vac through electronic control technology to output to the first power conversion circuit 31.

[0102] It is worth noting that the AC power supply 102 can be specifically understood as a municipal power supply, a photovoltaic AC power supply or an independent generator, or an AC power output after power conversion and adjustment of the municipal power supply, the photovoltaic AC power supply, an independent generator or any other reasonable superior power supply.

[0103] In one embodiment, the second power conversion circuit 33 specifically further includes an isolation transformer 331 and a rectifier circuit 332. The isolation transformer 331 is coupled to the resonant circuit 32 to receive the resonant current signal sent by the resonant circuit 32, and converts the resonant current signal into a second AC signal, so as to use electromagnetic connection instead of electrical connection to achieve primary and secondary side safety electrical isolation and voltage matching, and meet the primary and secondary side electrical safety insulation requirements.

[0104] The rectifier circuit 332 is coupled to the isolation transformer 331 and is used to couple with the external load circuit 101, and specifically involves transformer isolation and rectification. Specifically, the rectifier circuit 332 receives the second AC signal sent by the isolation transformer 331, and uses a high-frequency rectification technology, such as PWM, synchronous rectification, reverse damping rectification, and any other reasonable rectification method, to obtain a stable DC output, that is, a power output signal Vo, using the second AC signal to output to the load circuit 101 to meet the power usage of the load circuit 101.

[0105] In one embodiment, the isolation transformer 331 further includes a primary winding 3311 and a secondary winding 3312 , the resonant circuit 32 and the resonant current integration circuit 35 are coupled to the primary winding 3311 , the primary winding 3311 is coupled to the secondary winding 3312 , and the rectifier circuit 332 is coupled to the secondary winding 3312 .

[0106] In one embodiment, the power supply start-up control circuit 30 specifically also includes a voltage-stabilizing output circuit 38, and the voltage-stabilizing output circuit 38 further includes a voltage-stabilizing resistor Ro and a voltage-stabilizing capacitor Co. The rectifier circuit 332 specifically further includes a third diode D3 and a fourth diode D4, and the secondary winding 3312 specifically further includes a first sub-secondary winding 33121 and a second sub-secondary winding 33122.

[0107] Among them, the first end of the third diode D3 is coupled to the first end of the first sub-secondary winding 33121, the second end of the third diode D3 is coupled to the second end of the fourth diode D4, the first end of the voltage-stabilizing resistor Ro and the first end of the load circuit 101, the first end of the fourth diode D4 is coupled to the second end of the second sub-secondary winding 33122, the second end of the voltage-stabilizing resistor Ro is coupled to the first end of the voltage-stabilizing capacitor Co, and the second end of the voltage-stabilizing capacitor Co is coupled to the second end of the first sub-secondary winding 33121, the first end of the second sub-secondary winding 33122 and the second end of the load circuit 101.

[0108] In other embodiments, the rectifier circuit 332 can specifically be any reasonable circuit form for realizing AC to DC conversion, such as a full-bridge rectifier circuit or a half-bridge rectifier circuit composed of various switching tubes. The first sub-secondary winding 33121 and the second sub-secondary winding 33122 can also be replaced with the same winding, which is determined by the actual application scenario and is not limited in this application.

[0109] It can be understood that the rectifier circuit 332 is used to receive the second AC signal sent by the isolation transformer 331, and convert the second AC signal into a power output signal Vo, which can specifically be a steamed bun wave, and then use the stabilizing resistor Ro and the stabilizing capacitor Co to rectify the power output signal Vo into a set DC voltage signal to output to the load circuit 101 to drive the load circuit 101 to work.

[0110] In one embodiment, the main control circuit 34 specifically also includes a first proportional filter correction subcircuit 341, a second proportional filter correction subcircuit 342 and a control subcircuit 343, the first proportional filter correction subcircuit 341 is coupled to the voltage stabilization output circuit 38, and the second proportional filter correction subcircuit 342 is coupled to the resonant current integration circuit 35.

[0111] Among them, the first proportional filtering and correction sub-circuit 341 is used to obtain the power output signal Vo output by the voltage stabilizing output circuit 38 to the load circuit 101, and compares, filters and corrects the power output signal Vo with a reference value in sequence to obtain a first filtered signal; the second proportional filtering and correction sub-circuit 342 is used to obtain the integral voltage signal in the resonant current integration circuit 35, and compares, filters and corrects the integral voltage signal with a reference value in sequence to obtain a second filtered signal, so as to provide a more suitable high-quality input for the control sub-circuit 343, thereby effectively optimizing the overall performance and reliability of the main control circuit 34 to achieve efficient control.

[0112] The control subcircuit 343 is further used to receive the first filter signal and the second filter signal, so as to use the first filter signal and the second filter signal to respectively correspond to the first startup stage, the second startup stage and the third startup stage to obtain the first control signal, the second control signal and the third control signal, thereby using the first control signal, the second control signal and the third control signal to control the first power conversion circuit 31.

[0113] This application also specifically adopts a power startup control method, see Figure 8 , Figure 8 This is a flowchart of the first embodiment of the power startup control method of the present application. Specifically, it may include the following steps:

[0114] S41: Receive a power input signal.

[0115] It is understandable that the power startup control method in this embodiment is specifically a control method in which the power startup control circuit uses an externally provided power input signal and performs corresponding regulation and control on the power input signal to obtain a power output signal, and then provides it to the load circuit. The power startup control circuit specifically includes a first power conversion circuit, a resonant circuit, a second power conversion circuit, and a main control circuit, wherein the resonant circuit is coupled to the first power conversion circuit, the second power conversion circuit is coupled to the resonant circuit, and is used to couple with the load circuit, and the main control circuit is coupled to the first power conversion circuit, the resonant circuit, and the second power conversion circuit.

[0116] Specifically, the first power conversion circuit is used to receive a power input signal input.

[0117] S42: Convert the power input signal into a first AC signal.

[0118] Furthermore, the first power conversion circuit utilizes its internal switching action mechanism, such as the opening and closing action mechanism of switching devices such as IGBT, high-frequency transistor, MOS, etc., to quickly switch direct current or alternating current under signal control, generate an alternating voltage waveform, and obtain a first alternating current signal.

[0119] S43: Adjust the first AC signal to a resonant current signal.

[0120] The resonant circuit receives the first AC signal sent by the first power conversion circuit, and performs one or more of any reasonable signal adjustments such as filtering, shaping, phase shifting, etc. on the first AC signal to obtain a resonant current signal, so as to achieve better output characteristics and ensure that subsequent links, such as rectification circuits or loads, obtain more stable and efficient electric energy.

[0121] S44: Convert the resonant current signal into a power output signal to output to an external load circuit.

[0122] The second power conversion circuit is coupled to the resonant circuit to receive the resonant current signal sent by the resonant circuit, and performs power conversion and regulation control on the resonant current signal to obtain a stable power output, that is, a power output signal, which is then output to the load circuit to meet the power usage of the load circuit.

[0123] S45: In the first startup phase, generating a first control signal having a first signal frequency.

[0124] The main control circuit is specifically configured to generate a first control signal having a first signal frequency based on a preset program in a first startup phase.

[0125] It is worth noting that the first startup stage can be specifically understood as the initial stage in which the power startup control circuit receives the power input signal input to start the operation. For the convenience of quantification, the entire process in which the output voltage of the power output signal provided by the power conversion circuit to the load circuit slowly and monotonically rises from 0V to the target output voltage and stabilizes at the target output voltage can be divided into time intervals to obtain the first startup stage and the second startup stage.

[0126] Specifically, Figure 2 and Figure 3 As shown, the first startup stage can specifically correspond to the output voltage of the power supply output signal rising monotonically from 0V to the target output voltage and being stable at the target output voltage during the entire process of operation, according to the T0-T1 time stage determined by a preset duration, or according to the T0-T1 time stage corresponding to the output voltage of the power supply output signal rising from 0V to a preset voltage value, and the present application does not limit this.

[0127] Among them, in the initial stage when the power supply start-up control circuit receives the power supply input signal input, there is usually an instantaneous impact current. The first signal frequency can be specifically understood as the control of the inverter circuit through the first control signal, which can effectively suppress the instantaneous impact current currently received by the inverter circuit in time and the corresponding pre-set signal frequency of the first control signal. This application does not limit this.

[0128] Optionally, the first signal frequency of the first control signal generated by the main control circuit in the first startup phase may specifically be 90%-100% of the maximum resonant frequency of the resonant circuit, which is not limited in the present application.

[0129] The physical characteristics of the resonant circuit itself will determine a maximum resonant frequency and a minimum resonant frequency; the first control signal can specifically be a PFM signal with a fixed duty cycle of 50%, so that in the first startup stage, that is, the starting stage when the instantaneous impact current input to the power startup control circuit is relatively large, by setting the first control signal to the maximum resonant frequency or close to the maximum resonant frequency, the instantaneous impact current can be suppressed in time to avoid losses to the circuit.

[0130] The duration of the first startup phase may specifically be a set multiple m of the first signal period of the first control signal, that is, the duration of T0-T1 is m*1 / f, where m is a positive integer and f is the signal frequency of the first control signal.

[0131] S46: Regulate the first AC signal using the first control signal.

[0132] The first power conversion circuit is used to receive a first control signal and change a switch state under the action of the first control signal to adjust its output signal, ie, the first AC signal, and further adjust the operation of the resonant circuit.

[0133] S47: In the second startup phase, a regulated output signal is obtained by using the difference between the power output signal and the target reference voltage.

[0134] Specifically, Figure 2 and Figure 4 As shown, in the second startup stage, that is, the output voltage based on the power output signal Vo rises monotonically from 0V to the target output voltage and stabilizes at the target output voltage during the entire process, after the first startup stage, the T1-T2 time period is divided, and the main control circuit is configured to obtain the resonant current signal from the resonant circuit and the power output signal in the second power conversion circuit.

[0135] In the second startup stage, the main control circuit specifically adopts a voltage loop control strategy, or a PI controller uses the difference between the power supply output signal and the target reference voltage, that is, the difference between the set value and the feedback value to obtain a specific output signal for realizing signal regulation, that is, a regulated output signal.

[0136] S48: Detect whether the power supply output signal is greater than the target reference voltage.

[0137] The main control circuit is also specifically used to detect whether the power supply output signal is greater than the target reference voltage.

[0138] The target reference voltage increases linearly in the second startup phase, that is, its voltage amplitude changes with time in a preset linear function.

[0139] It is worth noting that the target reference voltage can be specifically understood as the power supply output signal monotonically and linearly increasing from 0 to the target output voltage under theoretical conditions during the entire startup phase, and stabilizing at the changing voltage amplitude of the target output voltage; or, the voltage amplitude linearly increasing in the second startup phase.

[0140] If the power output signal is greater than the target reference voltage, S49 is executed; if the power output signal is not greater than the target reference voltage, S410 is executed.

[0141] S49: Do not use the second control signal to adjust the first AC signal.

[0142] It can be understood that in the second startup stage, when the main control circuit determines that the power output signal is greater than the target reference voltage, specifically, the second control signal is not sent to the first power conversion circuit, that is, the first power conversion circuit will not receive the drive control signal, and each switch sub-circuit inside it will be in the off state. It can be specifically understood that when the power output signal is greater than the target reference voltage, the main control circuit's control of the first power conversion circuit will be converted to the BURST control mode, so as to use the PWM dead zone module to eliminate the actual PWM wave of the drive, that is, the actual wave of the second control signal will be zero.

[0143] S410: Perform slope compensation on the regulated output signal using a first slope compensation slope to obtain a first feedback regulated signal.

[0144] In the second startup stage, when the main control circuit determines that the power output signal is not greater than the target reference voltage, the first slope compensation slope is used to perform slope compensation on the regulated output signal to generate a first feedback regulation signal.

[0145] S411: Generate a second control signal using the first feedback adjustment signal and the resonant current signal.

[0146] The first feedback regulation signal includes the regulated output signal and the signal information after slope compensation. The main control circuit specifically compares the first feedback regulation signal with the resonant current signal to generate a second control signal based on the difference between the two.

[0147] S412: Regulate the first AC signal using the second control signal.

[0148] The first power conversion circuit is also used to receive a second control signal and change the switch state under the action of the second control signal to adjust its output signal, that is, the first AC signal, and further adjust the operation of the resonant circuit.

[0149] See also Fig. 9 , Fig. 9 : is a flow chart of the second embodiment of the power startup control method of the present application. The power startup control method of this embodiment is Figure 8 A flowchart of a detailed implementation of the power startup control method in the embodiment of the present invention specifically includes the following steps:

[0150] S51: Receive a power input signal.

[0151] S52: Convert the power input signal into a first AC signal.

[0152] S53: Adjust the first AC signal to a resonant current signal.

[0153] S54: Convert the resonant current signal into a power output signal to output to an external load circuit.

[0154] S55: In the first startup phase, generating a first control signal having a first signal frequency.

[0155] S56: Regulate the first AC signal using the first control signal.

[0156] S57: In the second startup phase, a regulated output signal is obtained by using the difference between the power output signal and the target reference voltage.

[0157] S58: Detect whether the power supply output signal is greater than the target reference voltage.

[0158] S59: Do not use the second control signal to adjust the first AC signal.

[0159] S510: Perform slope compensation on the regulated output signal using a first slope compensation slope to obtain a first feedback regulated signal.

[0160] S511: Generate a second control signal using the first feedback adjustment signal and the resonant current signal.

[0161] S512: Regulate the first AC signal using the second control signal.

[0162] Among them, S51, S52, S53, S54, S55, S56, S57, S58, S59, S510, S511 and S512 are Figure 8S41, S42, S43, S44, S45, S46, S47, S48, S49, S410, S411 and S412 are the same. Please refer to S41, S42, S43, S44, S45, S46, S47, S48, S49, S410, S411 and S412 and their related text descriptions for details. I will not repeat them here.

[0163] S513: When the power output signal is greater than or equal to the set voltage threshold, entering the third startup phase, using the second slope compensation slope to perform slope compensation on the regulated output signal to obtain a second feedback regulated signal.

[0164] Specifically, the main control circuit is also used to enter the third startup stage when it is determined that the power output signal is greater than or equal to the set voltage threshold, that is, after time T2, use the second slope compensation slope to perform slope compensation on the regulated output signal to obtain a second feedback regulation signal.

[0165] S514: Generate a third control signal using the second feedback adjustment signal and the resonant current signal.

[0166] Furthermore, a third control signal is generated using the second feedback regulation signal and the resonant current signal.

[0167] S515: Regulate the first AC signal using the third control signal.

[0168] The first electric energy conversion circuit is specifically further used to receive a third control signal, and use the third control signal to adjust the first AC signal to adjust the resonance state of the resonance circuit.

[0169] The above scheme creatively solves the problems of large starting current and poor monotonicity through three-stage starting control, so as to achieve smoother starting control. While suppressing instantaneous impact current, it also effectively ensures a better gain effect of the resonant circuit, improves the loop amplitude gain, increases the amplitude range, and enhances the dynamic performance, thereby ensuring better performance in a wider range of application scenarios.

[0170] See also Fig.10 , Fig.10 : is a flow chart of the third embodiment of the power startup control method of the present application. The power startup control method of this embodiment is Figure 8 A flowchart of a detailed implementation of the power startup control method in the embodiment of the present invention specifically includes the following steps:

[0171] S61: Receive a power input signal.

[0172] S62: Convert the power input signal into a first AC signal.

[0173] S63: Adjust the first AC signal to a resonant current signal.

[0174] S64: Convert the resonant current signal into a power output signal to output to an external load circuit.

[0175] S65: In the first startup phase, generating a first control signal having a first signal frequency.

[0176] S66: Regulate the first AC signal using the first control signal.

[0177] S67: In the second startup phase, a regulated output signal is obtained by using the difference between the power output signal and the target reference voltage.

[0178] Among them, S61, S62, S63, S64, S65, S66 and S67 are Figure 8 S41, S42, S43, S44, S45, S46 and S47 are the same. Please refer to S41, S42, S43, S44, S45, S46 and S47 and their related text descriptions for details, which will not be repeated here.

[0179] S68: Detect whether the second signal frequency of the pre-control signal obtained by using the adjustment output signal corresponding to the start time of the second startup stage is less than the maximum resonance frequency of the resonance circuit.

[0180] It is understandable that in the process of entering the closed loop from the previous open-loop stage, that is, after entering the second startup stage from the first startup stage, because the signal frequency f1 of the PWM of the first second signal period corresponding to the second control signal is uncertain, if the signal frequency f1 is greater than or equal to fmax, then the PWM of the first second signal period will run at the maximum frequency fmax, and thus can switch to closed-loop control better without overvoltage and overshoot; but if the signal frequency f1 is less than fmax, there will be a power supply output signal greater than the target reference voltage, and at this time there is a need to adopt the BURST control mode.

[0181] Therefore, the main control circuit can also specifically detect the second signal frequency of the pre-control signal obtained by using the adjustment output signal corresponding to the starting time of the second startup stage, that is, whether the signal frequency that may appear in the second control signal in the first second signal cycle after entering the second startup stage is less than the maximum resonant frequency of the resonant circuit, so as to determine the next control strategy.

[0182] Among them, if the second signal frequency is not less than the maximum resonant frequency of the resonant circuit, no overvoltage and overshoot will occur, so S69 and S610 can be skipped and S611 can be executed directly; and if the second signal frequency is not less than the maximum resonant frequency of the resonant circuit, S69 is executed.

[0183] S69: Detect whether the power supply output signal is greater than the target reference voltage.

[0184] S610: Do not use the second control signal to regulate the first AC signal.

[0185] S611: Perform slope compensation on the regulated output signal using a first slope compensation slope to obtain a first feedback regulated signal.

[0186] S612: Generate a second control signal using the first feedback adjustment signal and the resonant current signal.

[0187] S613: Regulate the first AC signal using the second control signal.

[0188] Among them, S69, S610, S611, S612 and S613 are Figure 8 S48, S49, S410, S411 and S412 are the same. Please refer to S48, S49, S410, S411 and S412 and their related text descriptions for details, which will not be repeated here.

[0189] See also Fig.11 , Fig.11 : is a flowchart of the fourth embodiment of the power startup control method of the present application. The power startup control method of this embodiment is Figure 8 A flowchart of a detailed implementation of the power startup control method in the embodiment of the present invention specifically includes the following steps:

[0190] S71: Receive a power input signal.

[0191] S72: Convert the power input signal into a first AC signal.

[0192] S73: Adjust the first AC signal to a resonant current signal.

[0193] S74: Convert the resonant current signal into a power output signal to output to an external load circuit.

[0194] S75: In the first startup phase, generating a first control signal having a first signal frequency.

[0195] S76: Regulate the first AC signal using the first control signal.

[0196] S77: In the second startup phase, a regulated output signal is obtained using the difference between the power output signal and the target reference voltage.

[0197] S78: Detect whether the power supply output signal is greater than the target reference voltage.

[0198] S79: Do not use the second control signal to adjust the first AC signal.

[0199] Among them, S71, S72, S73, S74, S75, S76, S77, S78 and S79 are Figure 8 S41, S42, S43, S44, S45, S46, S47, S48 and S49 are the same. Please refer to S41, S42, S43, S44, S45, S46, S47, S48 and S49 and their related text descriptions for details. I will not repeat them here.

[0200] S710: In the first half of the second signal cycle of each second control signal, in response to the power output signal being less than or equal to the target reference voltage, or the second drive signal being adjusted from the first level to the second level, a delay setting time is performed or a first slope compensation slope is used to perform slope compensation on the feedback adjustment signal to obtain a first feedback adjustment signal.

[0201] Specifically, the first power conversion circuit further includes a first switch subcircuit and a second switch subcircuit, the first switch subcircuit is coupled to the second switch subcircuit, the resonant circuit and the main control circuit, and the second switch subcircuit is coupled to the main control circuit.

[0202] Among them, Figure 4 As shown, the second control signal includes a first drive signal PWMA and a second drive signal PWMB. In the second startup stage, the main control circuit is specifically used to, in the first half of the second signal cycle of each second control signal, in response to the power output signal being less than or equal to the target reference voltage, or the moment when each second drive signal PWMB is adjusted from the first level to the second level, delay the feedback adjustment signal by a set time length or simultaneously use the first slope compensation slope to perform slope compensation on the feedback adjustment signal to obtain the first feedback adjustment signal.

[0203] S711: Delay for a set time or adjust the first driving signal from the second level to the first level at the same time.

[0204] Furthermore, the main control circuit is also used to delay the setting time length or simultaneously adjust the first driving signal from the second level to the first level.

[0205] S712: When the voltage amplitudes of the first feedback adjustment signal and the resonant current signal are equal, adjust the first driving signal from the first level to the second level.

[0206] When the voltage amplitudes of the first feedback adjustment signal and the resonant current signal are equal, the first driving signal PWMA is adjusted from the first level to the second level.

[0207] S713: In the second half period of each second signal period, copy the first driving signal of each first half period to obtain a second driving signal.

[0208] In the second half of each second signal cycle, the main control circuit can specifically directly copy the first drive signal PWMA of each first half of the cycle to obtain the second drive signal PWMB.

[0209] It can be understood that in the first half of each second signal cycle, specifically, the first drive signal PWMA has a first level state, and in the second half of each second signal cycle, the first drive signal PWMA continues to be in the second level state; and the second drive signal PWMB continues to be in the second level state in the first half of each second signal cycle, and in the second half of each second signal cycle, the level change state of the first drive signal PWMA in the first half of each second signal cycle is adjusted and copied to obtain the level change state of the second drive signal PWMB.

[0210] S714: Regulate the first AC signal using the first drive signal and the second drive signal.

[0211] Among them, the first switch sub-circuit and the second switch sub-circuit are respectively used to receive the first drive signal PWMA and the second drive signal PWMB, so as to change the switch state under the action of the first drive signal PWMA and the second drive signal PWMB, thereby regulating the first AC signal to adjust the resonant state of the resonant circuit.

[0212] It is understandable that in some other embodiments, the power startup control method specifically includes some other more specific circuit units to be able to implement other more specific control methods. For details, please refer to Figure 1-Figure 7 And related text descriptions will not be repeated here.

[0213] This application also specifically uses an electronic device, see Fig.12 , Fig.12 1 is a schematic diagram of a framework of an electronic device of the present application. In this embodiment, the electronic device 80 includes a housing 81 and a power startup control circuit 82 connected to the housing 81 .

[0214] Optionally, the electronic device 80 may be any reasonable electronic mechanical device such as a server, a computer, an intelligent communication device, etc., and this application does not limit this.

[0215] It should be noted that the power startup control circuit 82 described in this embodiment is the power startup control circuit 10, the power startup control circuit 20 or the power startup control circuit 30 described in any one of the above embodiments. Figure 1-Figure 7 And the related text content will not be repeated here.

[0216] The beneficial effects of the present application are as follows: Different from the prior art, the first power conversion circuit in the power startup control circuit provided by the present application is used to receive a power input signal to convert the power input signal into a first AC signal; the resonant circuit receives the first AC signal sent by the first power conversion circuit and adjusts the first AC signal into a resonant current signal; the second power conversion circuit is used to couple with the load circuit to receive the resonant current signal sent by the resonant circuit and convert the resonant current signal into a power output signal to output to the load circuit; the main control circuit is configured to: in a first startup phase, generate a first control signal with a first signal frequency, and in a second startup phase, obtain the resonant current signal and the power output signal, and obtain an adjustment output signal using the difference between the power output signal and the target reference voltage, in response to the power output signal being less than or equal to the target reference voltage, use a first slope compensation slope to perform slope compensation on the adjustment output signal to obtain a first feedback adjustment signal, so as to generate a second control signal using the first feedback adjustment signal and the resonant current signal signal; wherein, the target reference voltage increases linearly in the second startup stage; the first power conversion circuit is used to receive the first control signal and the second control signal sent in sequence by the main control circuit, so as to use the first control signal and the second control signal to adjust the first AC signal, so that in the initial stage of the power startup control circuit starting operation, that is, in the initial stage of receiving the power input signal, different control strategies are adopted in different startup stages to timely suppress the instantaneous impact current to avoid loss to the circuit; and in the first startup stage, open-loop control is adopted to make the resonant cavity current sinusoidal, and in the second startup stage, slope compensation control is adopted in the interval where the power output signal is less than or equal to the target reference voltage, which effectively solves the problems of large starting current and poor monotonicity, so as to achieve smoother startup control, and while suppressing the instantaneous impact current, it also effectively guarantees the better gain effect of the resonant circuit, improves the loop amplitude gain, increases the amplitude domain, and enhances the dynamic performance, thereby ensuring better performance in a wider range of application scenarios.

[0217] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A power startup control circuit, characterized in that: The power startup control circuit comprises: A first power conversion circuit, used for receiving a power input signal to convert the power input signal into a first AC signal; a resonant circuit, coupled to the first power conversion circuit, to receive the first AC signal sent by the first power conversion circuit, and to adjust the first AC signal into a resonant current signal; a second power conversion circuit, coupled to the resonant circuit and used to couple to a load circuit to receive the resonant current signal sent by the resonant circuit and convert the resonant current signal into a power output signal to output to the load circuit; A main control circuit is coupled to the first power conversion circuit, the resonant circuit and the second power conversion circuit, and the main control circuit is configured to: generate a first control signal with a first signal frequency in a first startup phase; In the second startup stage, the resonant current signal in the resonant circuit and the power output signal in the second power conversion circuit are obtained, and the adjustment output signal is obtained by using the difference between the power output signal and the target reference voltage, in response to the power output signal being less than or equal to the target reference voltage, the adjustment output signal is slope compensated by using a first slope compensation slope to obtain a first feedback adjustment signal, so as to generate a second control signal by using the first feedback adjustment signal and the resonant current signal, and send the second control signal to the first power conversion circuit; wherein the target reference voltage increases linearly in the second startup stage, and in the second startup stage, the main control circuit does not send the second control signal to the first power conversion circuit in response to the power output signal being greater than the target reference voltage; The first power conversion circuit is used to receive the first control signal and the second control signal sent sequentially by the main control circuit, so as to adjust the first AC signal using the first control signal and the second control signal.

2. The power startup control circuit according to claim 1, characterized in that: The main control circuit is configured to: when it is determined that the power supply output signal is greater than or equal to a set voltage threshold, enter a third startup phase, use a second slope compensation slope to perform slope compensation on the regulated output signal to obtain a second feedback regulation signal, and use the second feedback regulation signal and the resonant current signal to generate a third control signal; The first power conversion circuit is further configured to receive the third control signal and use the third control signal to adjust the first AC signal.

3. The power startup control circuit according to claim 2, characterized in that: The second slope compensation slope is equal to the first slope compensation slope; The set voltage threshold is 50%-70% of the target output voltage corresponding to the power output signal.

4. The power startup control circuit according to claim 1, characterized in that: The power startup control circuit further includes a resonant current integration circuit, which is coupled to the resonant circuit and the main control circuit to obtain the resonant current signal in the resonant circuit and adjust the resonant current signal to an integrated voltage signal; The main control circuit is configured to: in the second startup phase, receive the integrated voltage signal sent by the resonant current integration circuit, so as to generate a second control signal using the first feedback adjustment signal and the integrated voltage signal.

5. The power startup control circuit according to claim 4, characterized in that: The first power conversion circuit includes a first switch subcircuit and a second switch subcircuit, the first switch subcircuit is coupled to the second switch subcircuit, the resonant circuit and the main control circuit, the second switch subcircuit is coupled to the main control circuit, and the second control signal includes a first drive signal and a second drive signal; In the second startup stage, the main control circuit is configured to: in the first half cycle of each second signal cycle of the second control signal, in response to the power output signal being less than or equal to the target reference voltage, or the second drive signal being adjusted from the first level to the second level, delay the feedback adjustment signal for a set time or simultaneously use the first slope compensation slope to perform slope compensation on the feedback adjustment signal to obtain a first feedback adjustment signal, and delay the set time or simultaneously adjust the first drive signal from the second level to the first level, so that when the voltage amplitude of the first feedback adjustment signal is equal to that of the integrated voltage signal, the first drive signal is adjusted from the first level to the second level; in the second half cycle of each second signal cycle, copy the first drive signal of each first half cycle to obtain the second drive signal; The first switch subcircuit and the second switch subcircuit are used to receive the first drive signal and the second drive signal respectively, and change the switch state under the action of the first drive signal and the second drive signal respectively to adjust the first AC signal.

6. The power startup control circuit according to claim 5, characterized in that: The resonant circuit includes a first resonant capacitor, a second resonant capacitor and a resonant inductor, the resonant current integration circuit includes a current transformer and an integration sampling capacitor, the first end of the first resonant capacitor is coupled to the first end of the first switch subcircuit, the second end of the first resonant capacitor is coupled to the first end of the second resonant capacitor and the first end of the current transformer, the second end of the second resonant capacitor is coupled to the second end of the second switch subcircuit, the second end of the current transformer is coupled to the second end of the second power conversion circuit, the first end of the resonant inductor is coupled to the second end of the first switch subcircuit and the first end of the second switch subcircuit, the second end of the resonant inductor is coupled to the first end of the second power conversion circuit, the third end of the current transformer is coupled to the first end of the integration sampling capacitor and the first end of the main control circuit, and the fourth end of the current transformer is coupled to the second end of the integration sampling capacitor and the second end of the main control circuit; The main control circuit is used to sample and obtain the voltage between the first terminal and the second terminal of the integral sampling capacitor to obtain the integral voltage signal.

7. A power startup control method, characterized in that: The power startup control method comprises: receiving a power input signal; Converting a power input signal into a first AC signal; adjusting the first AC signal to a resonant current signal; Converting the resonant current signal into a power output signal to output to an external load circuit; In a first startup phase, generating a first control signal having a first signal frequency; regulating the first AC signal using the first control signal; In the second startup phase, a regulated output signal is obtained by using a difference between the power supply output signal and a target reference voltage; wherein the target reference voltage increases linearly in the second startup phase; Detecting whether the power supply output signal is greater than the target reference voltage; if the power supply output signal is not greater than the target reference voltage, performing slope compensation on the regulated output signal using a first slope compensation slope to obtain a first feedback regulated signal; generating a second control signal using the first feedback regulation signal and the resonant current signal; regulating the first AC signal using the second control signal; If the power supply output signal is greater than the target reference voltage, the first AC signal is not regulated by the second control signal.

8. The power startup control method according to claim 7, characterized in that: After the step of adjusting the first AC signal by using the second control signal, the method further includes: When the power supply output signal is greater than or equal to the set voltage threshold, the third startup phase is entered, and the second slope compensation slope is used to perform slope compensation on the regulated output signal to obtain a second feedback regulated signal; generating a third control signal using the second feedback adjustment signal and the resonant current signal; The first AC signal is regulated using the third control signal.

9. The power startup control method according to claim 7, characterized in that: After the step of obtaining the regulated output signal by using the difference between the power supply output signal and the target reference voltage in the second startup phase, the step of detecting that the power supply output signal is less than or equal to the target reference voltage; wherein, before the step of linearly increasing the target reference voltage in the second startup phase, the step further includes: Detecting whether a second signal frequency of a pre-control signal obtained by using the adjustment output signal corresponding to the start time of the second startup stage is less than a maximum resonant frequency; If the second signal frequency is not less than the maximum resonant frequency, performing slope compensation on the regulated output signal using the first slope compensation slope to obtain the first feedback regulated signal; If the second signal frequency is less than the maximum resonant frequency, it is detected whether the power supply output signal is not greater than the target reference voltage.

10. The power startup control method according to claim 7, characterized in that: The second control signal includes a first drive signal and a second drive signal, and the step of using a first slope compensation slope to perform slope compensation on the regulated output signal to obtain a first feedback regulated signal includes: In the first half of each second signal cycle of the second control signal, in response to the power output signal being less than or equal to the target reference voltage, or the second drive signal being adjusted from the first level to the second level, delaying the feedback adjustment signal for a set time or simultaneously using the first slope compensation slope to perform slope compensation on the feedback adjustment signal to obtain a first feedback adjustment signal; The step of generating a second control signal by using the first feedback adjustment signal and the resonant current signal comprises: Delaying the set time or adjusting the first driving signal from the second level to the first level at the same time; When the voltage amplitudes of the first feedback adjustment signal and the resonant current signal are equal, adjusting the first drive signal from the first level to the second level; In the second half period of each second signal period, copy the first driving signal of each first half period to obtain the second driving signal; The step of regulating the first AC signal by using the second control signal comprises: The first AC signal is regulated using the first drive signal and the second drive signal.

11. An electronic device, characterized in that: The electronic device comprises a housing and a power startup control circuit connected to the housing; Wherein, the power startup control circuit is the power startup control circuit as described in any one of claims 1-6.

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