Display device, resonant converter and control method for soft start of power conversion circuit

Abstract

The application provides a display device, a resonant converter and a control method for soft starting of a power conversion circuit, comprising: in response to receiving a starting signal, obtaining a rated output voltage of the power conversion circuit and a preset starting period; based on the rated output voltage and the preset starting period, determining a target resistance value of a resistance and a target capacity value of a capacitance of a soft-start charging model circuit, and assigning values to the resistance and the capacitance; taking the rated output voltage as an input voltage of the soft-start charging model circuit, obtaining a voltage across the capacitance, and outputting a voltage corresponding to the voltage across the capacitance as an output voltage of the power conversion circuit, so as to realize soft starting of the power conversion circuit. Specifically, the power conversion circuit soft starting provided by the application overcomes the limitations of the traditional hardware RC charging method on LLC circuit soft starting. Moreover, by setting, the resistance value and the capacitance value in the charging model circuit are adjustable, and the flexibility and adaptability of the system are increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of circuit control, in particular to a display device, a resonant converter and a control method for soft start of a power conversion circuit. BACKGROUND

[0002] In the conventional soft start process of an LLC (resonant converter) circuit, a hardware RC charging method is often used to set a ramp signal.

[0003] However, this method has certain limitations, such as increased complexity and cost of the hardware circuit, poor flexibility, etc.

[0004] Therefore, the existing LLC circuit soft start method needs to be improved. SUMMARY

[0005] To solve the above problems, the present application provides a display device, a resonant converter and a control method for soft start of a power conversion circuit, which can solve the limitations of the existing LLC circuit soft start.

[0006] To solve the above problems, the first technical solution provided by the present application is to provide a control method for soft start of a power conversion circuit, comprising:

[0007] In response to receiving a start signal, the rated output voltage of the power conversion circuit and the preset start period are obtained;

[0008] Based on the rated output voltage and the preset start period, the target resistance value of the resistance and the target capacity value of the capacitance of the soft start charging model circuit are determined, and the resistance value of the resistance and the capacity of the capacitance are assigned; wherein the resistance and the capacitance are connected in series;

[0009] The rated output voltage is taken as the input voltage of the soft start charging model circuit, the voltage across the capacitance is obtained, and the voltage corresponding to the voltage across the capacitance is output as the output voltage of the power conversion circuit, so as to realize the soft start of the power conversion circuit.

[0010] In an embodiment, the step of determining the target resistance value of the resistance and the target capacity value of the capacitance of the soft start charging model circuit based on the rated output voltage and the preset start period, and assigning the resistance value of the resistance and the capacity of the capacitance comprises:

[0011] A plurality of charging curves of the voltage across the capacitance changing with time under different resistance values and capacitance values are found, and through the plurality of charging curves, the reference resistance value and the reference capacitance value corresponding to the rated output voltage at the preset start period are determined; wherein the charging curve is of an exponential type.

[0012] determining the reference resistance value as a target resistance value and the reference capacitance value as the target capacitance value.

[0013] In an embodiment, the step of determining the reference resistance value and the reference capacitance value based on the plurality of charging curves comprises:

[0014] establishing the soft-start charging model circuit and setting a plurality of combinations of capacitance values and resistance values;

[0015] charging the capacitor through each combination to obtain a plurality of charging curves of the capacitor voltage changing with time under different resistance values and capacitance values by using a charging formula of an RC circuit.

[0016] In an embodiment, the step of taking the rated output voltage as an input voltage of the soft-start charging model circuit, obtaining a voltage across the capacitor, and outputting a voltage corresponding to the voltage across the capacitor as an output voltage of the power conversion circuit comprises:

[0017] outputting the voltage across the capacitor as the output voltage of the power conversion circuit; or

[0018] outputting a voltage less than the voltage across the capacitor as the output voltage of the power conversion circuit.

[0019] In an embodiment, the step of outputting a voltage corresponding to the voltage across the capacitor as an output voltage of the power conversion circuit to realize soft-start of the power conversion circuit comprises:

[0020] determining a pulse width modulation signal corresponding to the voltage across the capacitor;

[0021] controlling a switch in the power conversion circuit to work based on the pulse width modulation signal to realize soft-start of the power conversion circuit.

[0022] In an embodiment, the step of determining a pulse width modulation signal corresponding to the voltage across the capacitor comprises:

[0023] determining a duty cycle of the pulse width modulation signal based on the voltage across the capacitor.

[0024] In an embodiment, the step of determining a pulse width modulation signal corresponding to the voltage across the capacitor comprises:

[0025] determining a frequency of the pulse width modulation signal based on the voltage across the capacitor.

[0026] In an embodiment, the method comprises, in response to receiving the start signal:

[0027] in response to receiving the start signal; or

[0028] in response to receiving the fault recovery signal.

[0029] To solve the above problems, the second technical solution provided by the present application is to provide a resonant converter, comprising:

[0030] a power conversion circuit;

[0031] a controller electrically connected to the power conversion circuit;

[0032] The controller responds to the receipt of the start signal, and the controller executes any of the above control methods.

[0033] To solve the above problems, the third technical solution provided by the present application is to provide a display device, comprising:

[0034] a load, the load comprising a light emitting element;

[0035] The resonant converter as described above is electrically connected to the load, and is used to realize soft start of the load.

[0036] The beneficial effects of the present application are that, different from the prior art, the power conversion circuit soft start control method provided by the present application responds to the receipt of the start signal to obtain the rated output voltage of the power conversion circuit and the preset start period; based on the rated output voltage and the preset start period, the target resistance value of the resistance and the target capacity value of the capacitor of the soft start charging model circuit are determined, and the resistance and the capacity are valued; wherein the resistance and the capacitor are connected in series; the rated output voltage is used as the input voltage of the soft start charging model circuit, the voltage across the capacitor is obtained, and the voltage corresponding to the voltage across the capacitor is output as the output voltage of the power conversion circuit, so as to realize the soft start of the power conversion circuit. Specifically, the power conversion circuit soft start control method of the present application overcomes the limitations of the traditional hardware RC (capacitor resistance) charging method on the soft start of the LLC circuit. And by setting the resistance value and the capacity value in the charging model circuit adjustable, the flexibility and adaptability of the system are increased. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0038] Figure 1 A schematic diagram of a module of a display device provided in one embodiment of the present application;

[0039] Figure 2 A schematic diagram of a module of a resonant converter provided in one embodiment of the present application;

[0040] Figure 3 A flowchart of a method for controlling soft start of a power conversion circuit according to an embodiment of the present application;

[0041] Figure 4 for Figure 3 Flowchart of an embodiment of step S2;

[0042] Figure 5 for Figure 3 Flowchart of an embodiment of step S3;

[0043] Figure 6 A circuit diagram of a soft start charging model circuit provided in one embodiment of the present application;

[0044] Figure 7 for Figure 6 The charging curve diagram of the soft start charging model circuit shown;

[0045] Figure 8 This is a charging curve diagram of the resonant converter output provided by an embodiment of the present application. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0047] In this application, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0048] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0049] In the description of the embodiments of the application, the term“and / or” is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character“ / ” herein generally represents an“or” relationship between the associated objects.

[0050] In the description of the embodiments of the application, the term“a plurality of” refers to two or more (including two).

[0051] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical terms such as“connection” should be understood in a broad sense, for example, it can be direct connection or indirect connection through an intermediate medium, or it can be internal connection of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0052] Reference is made to Figure 1 , Figure 1 The module schematic diagram of the display device provided by an embodiment of the application is shown.

[0053] Specifically, the application provides a display device 1000, comprising a load 100 and a resonant converter 200.

[0054] The load 100 comprises light-emitting elements, and the number of the light-emitting elements is not limited. The types of the light-emitting elements include but are not limited to LED (light-emitting diode), OLED (organic light-emitting diode), and Micro-LED (micro light-emitting diode).

[0055] In some embodiments, the load 100 can be a light-emitting layer, or the load 100 can also be a backlight panel, which is not limited here.

[0056] The resonant converter 200 is electrically connected with the load 100, and is used to realize soft start of the load 100.

[0057] Specifically, the soft start of the load 100 is realized by using the resonant converter 200 in the application, which can reduce the large impact current generated at the starting moment, reduce the damage to the load 100, and protect the light-emitting element. In addition, the soft start of the load 100 is realized by using the resonant converter 200 in the application, which can also reduce electromagnetic interference and prolong the service life of the light-emitting element.

[0058] Referring to Figure 2 , Figure 2 A module schematic diagram of the resonant converter provided by an embodiment of the application is provided.

[0059] Specifically, the resonant converter 200 includes a controller 202 and a power conversion circuit 201 electrically connected. The power conversion circuit 201 is electrically connected with the load 100 to realize the soft start of the load 100.

[0060] The power conversion circuit 201 is an LLC circuit, which mainly includes an input filter circuit, an LLC resonant circuit and an output rectifier filter circuit. The input filter circuit is generally composed of capacitors, inductors and the like, and is used to filter out high-frequency noise and ripple in the input power supply to provide a stable DC input for the subsequent circuit. The LLC resonant circuit is the core part of the entire circuit, which is composed of a series inductor, a series capacitor and a parallel inductor. The series inductor and the series capacitor form a series resonant loop, and the parallel inductor is connected in parallel. The output rectifier filter circuit generally uses diodes or synchronous rectifier tubes to form a rectifier bridge to convert high-frequency alternating current signals into direct current signals, and then filters through capacitors, inductors and the like to obtain a stable direct current output voltage, thereby realizing the start of the load 100.

[0061] The controller 202 can be a single-chip microcomputer, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) and the like, which is not limited here.

[0062] In the application, to realize the soft start of the power conversion circuit 201 and further realize the soft start of the load 100, the controller 202 responds to the reception of the start signal to perform a control method for the soft start of the power conversion circuit 201.

[0063] Referring to Figure 3 , Figure 3 A flowchart of the control method for the soft start of the power conversion circuit provided by an embodiment of the application is provided.

[0064] Specifically, the control method includes:

[0065] Step S1: In response to receiving a start signal, the rated output voltage of the power conversion circuit 201 and the preset start period are obtained.

[0066] In an embodiment, the start-up signal is a power-on signal. For example, the start-up signal is a power-on signal of the display device 1000. Of course, in actual applications, the resonant converter 200 is not limited to being applied to the display device 1000, but can also be applied to any device to which the resonant converter 200 can be applied.

[0067] It should be noted that the power-on signal can be a device power-off signal; the power-on signal can also be a signal lamp for switching the device from a standby state to a working state, which is not limited herein.

[0068] In another embodiment, the start-up signal is a fault recovery signal. For example, the fault recovery signal is a signal for switching the device from any fault state to a running state.

[0069] It can be understood that, by setting the start-up signal to be a power-on signal or a fault recovery signal, the application improves the application scenarios of soft start, increases the reliability and adaptability of the system, and especially in the scenario of recovering the device from a fault to a running state, the circuit and equipment can be effectively protected.

[0070] The rated output voltage is the output voltage of the power conversion circuit 201, and is also the rated working voltage of the load 100.

[0071] The preset start-up period refers to a soft start period, that is, the time for the voltage of the load 100 to change from 0 to the rated working voltage. The preset start-up period is set according to actual needs. It is intended to reduce the large impact current generated at the start-up moment, reduce the damage to the load 100, reduce electromagnetic interference, and prolong the service life of the load 100.

[0072] Step S2: based on the rated output voltage and the preset start-up period, determine the target resistance value of the resistance and the target capacity value of the capacitance of the soft start charging model circuit, and assign the resistance value of the resistance and the capacity of the capacitance.

[0073] Specifically, based on the rated output voltage and the preset start-up period, the target resistance value of the resistance and the target capacity value of the capacitance of the soft start charging model circuit are determined. In this way, the resistance value of the resistance and the capacity value of the capacitance of the soft start charging model circuit can be flexibly adjusted according to actual needs and scenarios, so as to adapt to different circuit working conditions and soft start requirements.

[0074] In an embodiment, referring to Figure 4 , Figure 4 is a flowchart of an embodiment of step S2 in Figure 3 Step S2 includes:

[0075] Step S21: establish a soft start charging model circuit, and set a plurality of combinations of capacitance values and resistance values.

[0076] Specifically, in the present application, the controller 202 utilizes a database to pre-establish a soft-start charging model circuit (RC charging circuit), which includes a capacitor and a resistor, and sets a plurality of combinations of capacitor values and resistor values.

[0077] In the soft-start charging model circuit, the resistor and the capacitor are connected in series.

[0078] Step S22: Simulate the charging of the capacitor through each combination by using the charging formula of the RC circuit, to obtain a plurality of charging curves of the capacitor voltage changing with time under different resistor values and capacitor values.

[0079] Specifically, the plurality of charging curves can be obtained by simulation or the like. It should be noted that the plurality of charging curves in the present application are all exponential.

[0080] Specifically, the existing charging curve is generally linear, for example, a straight line, but since the light intensity perceived by the observer rises exponentially, the existing soft-start method does not conform to the experience of the observer when starting the light-emitting element. In the present application, the charging curve is exponential, which can better meet the experience of the observer on the change of light intensity.

[0081] Step S23: Find the plurality of charging curves of the capacitor voltage changing with time under different resistor values and capacitor values, and determine the reference resistor value and the reference capacitor value corresponding to the rated output voltage in the preset starting period through the plurality of charging curves.

[0082] Specifically, based on the preset starting period and the rated output voltage, find the charging curve that meets the rated output voltage in the preset starting period in the plurality of charging curves, and then determine the resistor value and the voltage value corresponding to the charging curve.

[0083] Step S24: Determine the reference resistor value as the target resistor value, and determine the reference capacitor value as the target capacitor value.

[0084] That is, after step S24, the resistance value assignment of the resistor and the capacity assignment of the capacitor of the soft-start charging model circuit are realized.

[0085] Step S3: Take the rated output voltage as the input voltage of the soft-start charging model circuit, obtain the voltage across the capacitor, and output the voltage corresponding to the voltage across the capacitor as the output voltage of the power conversion circuit 201, to realize the soft-start of the power conversion circuit 201.

[0086] Specifically, the voltage across the capacitor changing with time can be calculated by using formula (1). Wherein, formula (1) is:

[0087] ;

[0088] Where Vc(t) is the voltage across the capacitor that changes with time, Vin is the rated output voltage, R is the target resistance value, C is the target capacitance value, and t is the time variable.

[0089] After each Vc(t) is obtained, the voltage corresponding to Vc(t) is output as the output voltage of the power conversion circuit 201 to achieve soft start of the power conversion circuit 201 .

[0090] In one embodiment, step S3 includes: outputting a voltage that is the same as the voltage across the capacitor as the output voltage of the power conversion circuit 201 .

[0091] In another embodiment, taking into account transfer loss, the output voltage of the power conversion circuit 201 may be slightly lower than the voltage across the capacitor. For example, the output voltage of the power conversion circuit 201 may be approximately 99% of the voltage across the capacitor. Therefore, step S3 includes outputting a voltage lower than the voltage across the capacitor as the output voltage of the power conversion circuit 201.

[0092] In one embodiment, see Figure 5 , Figure 5 for Figure 3 In the flowchart of an embodiment of step S3, the steps of outputting a voltage corresponding to the voltage across the capacitor as the output voltage of the power conversion circuit 201 to achieve soft start of the power conversion circuit 201 include:

[0093] Step S31: determining a pulse width modulation signal corresponding to the voltage across the capacitor.

[0094] In one embodiment, step S31 includes:

[0095] The frequency of the pulse width modulation signal is determined based on the voltage across the capacitor; and / or the duty cycle of the pulse width modulation signal is determined based on the voltage across the capacitor.

[0096] Specifically, after the voltage Vc(t) across the capacitor is calculated, a pulse width modulation signal is output based on Vc(t), wherein the frequency and / or duty cycle of the pulse width modulation signal is determined based on Vc(t).

[0097] Step S32 : controlling the operation of the switch tube in the power conversion circuit 201 based on the pulse width modulation signal to achieve soft start of the power conversion circuit 201 .

[0098] Specifically, the pulse width modulation signal is used to control the operation of the switch tube in the power conversion circuit 201, so that the power conversion circuit 201 generates a corresponding operating voltage, and then uses the operating voltage to drive the load 100 electrically connected thereto to operate.

[0099] Finally, at the end of the preset startup period, the voltage Vc(t) across the capacitor corresponds to a voltage substantially equal to the rated output voltage Vin, thereby achieving soft start.

[0100] Specifically, the soft start control method of the power conversion circuit 201 provided in the present application is based on the database in the controller 202 and has the following advantages:

[0101] 1. Overcome the limitations of traditional hardware RC charging method for LLC circuit soft start.

[0102] 2. By setting the start signal as a power-on signal or a fault repair signal, the application scenario of soft start is improved, and the reliability and adaptability of the system are increased. In particular, in the scenario where the device recovers from a fault, it can effectively protect the circuit and equipment.

[0103] 3. The resistance and capacitance values ​​in the charging model circuit are adjustable and can be precisely adjusted according to different application scenarios and requirements, increasing the flexibility and adaptability of the system.

[0104] This application also provides a specific implementation of a control method for soft starting of the power conversion circuit 201.

[0105] The first step is system initialization.

[0106] When the system starts, the controller 202 reads the rated output voltage Vin of the power conversion circuit 201 and the preset startup period, and sets the target resistance value of the resistor, the target capacitance value of the capacitor, and the time variable in the soft start charging model circuit.

[0107] For details, see Figure 6 and Figure 7 , Figure 6 This is a circuit structure diagram of a soft start charging model circuit provided in one embodiment of the present application. Figure 7 for Figure 6 The charging curve diagram of the soft start charging model circuit shown in FIG. 1 is a diagram showing a circuit including a resistor and a capacitor connected in series. The target resistance value R of the resistor and the target capacitance value C of the capacitor in the soft start charging model circuit are calculated as follows:

[0108] Assuming a preset startup cycle time of 125ms, an RC charging circuit requires approximately five time constants, τ, to reach approximately 99% of the rated output voltage, Vin. This is because each time constant theoretically charges the capacitor to approximately 63.2% of its rated output voltage, and at 5τ, the capacitor is essentially charged to 99.3%. Time constant τ = R * C. Given a preset startup cycle of 5τ = 125ms, R*C = 125 / 5 = 25ms.

[0109] By looking up the charging curve in the database, the reference resistance value and the reference capacitance value corresponding to the rated output voltage Vin reached in the preset starting period are determined, for example, selecting R=5K and C=5uF in the charging curve, which can meet the requirements.

[0110] Secondly, the soft-start charging model circuit simulates RC charging calculation:

[0111] According to the target resistance value R of the set resistance and the target capacitance value C of the capacitance, the controller 202 uses the RC charging formula in the mathematical library function in the controller (the above formula (1)) to calculate the value of the capacitance voltage Vc once every 500uS.

[0112] Wherein, the time variable t is added by 1 every 500uS, and when t=250, it indicates that 125mS has passed, and the preset starting period is completed.

[0113] Thirdly, Vc(t) signal output:

[0114] The calculated voltage value Vc(t) across the capacitance is used as the voltage setting value of the power conversion circuit 201, and a pulse width modulation signal is outputted, which is used to control the conduction and turn-off of the power switching device in the power conversion circuit 201.

[0115] Referring to Figure 8 , Figure 8 The charging curve diagram of the resonant converter output provided by an embodiment of the present application is shown in the figure. In this way, the voltage of the load 100 will rise along with Vc(t) until the voltage of the load 100 is equal to the rated output voltage Vin at the end of the preset starting period, so as to realize the soft-start process of the load.

[0116] The above is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent flow transformation using the content of the specification and the drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A method for controlling soft start of a power conversion circuit, characterized in that: include: Establish a soft start charging model circuit and set multiple combinations of capacitor values ​​and resistor values; In response to receiving a start signal, obtaining a rated output voltage and a preset start period of the power conversion circuit; The charging equation of the RC circuit is used to simulate the charging of the capacitor through each combination, thereby obtaining multiple charging curves showing the change of the capacitor voltage over time under different resistance and capacitance values; wherein the charging curve is exponential; Searching for a plurality of the charging curves, and determining, through the plurality of charging curves, a reference resistance value and a reference capacitance value corresponding to reaching the rated output voltage during the preset startup period; Determining the reference resistance value as the target resistance value of the resistor of the soft-start charging model circuit, determining the reference capacitance value as the target capacitance value of the resistor of the soft-start charging model circuit, and assigning values ​​to the resistance value of the resistor and the capacitance of the capacitor; wherein the resistor and the capacitor are connected in series; The rated output voltage is used as the input voltage of the soft start charging model circuit, the voltage across the capacitor is obtained, and a voltage corresponding to the voltage across the capacitor is output as the output voltage of the power conversion circuit to achieve soft start of the power conversion circuit.

2. The control method according to claim 1, characterized in that: The step of using the rated output voltage as the input voltage of the soft start charging model circuit, obtaining the voltage across the capacitor, and outputting a voltage corresponding to the voltage across the capacitor as the output voltage of the power conversion circuit includes: outputting a voltage identical to the voltage across the capacitor as the output voltage of the power conversion circuit; or A voltage smaller than the voltage across the capacitor is output as the output voltage of the power conversion circuit.

3. The control method according to claim 1, wherein: The step of outputting a voltage corresponding to the voltage across the capacitor as the output voltage of the power conversion circuit to achieve soft start of the power conversion circuit includes: Determine a pulse width modulation signal corresponding to the voltage across the capacitor; The operation of the switch tube in the power conversion circuit is controlled based on the pulse width modulation signal to achieve soft start of the power conversion circuit.

4. The control method according to claim 3, characterized in that: The step of determining the pulse width modulation signal corresponding to the voltage across the capacitor comprises: The duty cycle of the pulse width modulation signal is determined based on the voltage across the capacitor.

5. The control method according to claim 3, characterized in that: The step of determining the pulse width modulation signal corresponding to the voltage across the capacitor comprises: The frequency of the pulse width modulation signal is determined based on the voltage across the capacitor.

6. The control method according to claim 1, characterized in that: The step of responding to receiving a start signal comprises: In response to receiving a power-on signal; or In response to receiving a fault repair signal.

7. The control method according to claim 1, characterized in that: The obtaining of the voltage across the capacitor and outputting a voltage corresponding to the voltage across the capacitor as the output voltage of the power conversion circuit includes: Obtaining a voltage across the capacitor that varies with time based on the rated output voltage, the target resistance value, the target capacitance value, and a time variable; The voltage across the capacitor that changes with time and is obtained by calculation each time is used as the output voltage of the power conversion circuit.

8. The control method according to claim 7, characterized in that: The obtaining, based on the rated output voltage, the target resistance value, the target capacitance value, and the time variable, of a voltage across the capacitor that varies with time includes: The charging formula of the RC circuit is used to calculate the voltage across the capacitor that changes with time at every preset time interval.

9. A resonant converter, characterized in that: include: Power conversion circuit; a controller, electrically connected to the power conversion circuit; Wherein, in response to receiving a start signal, the controller executes the control method according to any one of claims 1 to 8.

10. A display device, characterized in that: include: a load, wherein the load includes a light-emitting element; The resonant converter according to claim 9, electrically connected to the load, and configured to implement soft starting of the load.

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