Control method of three-phase resonance circuit and related device

Abstract

The invention discloses a control method of a three-phase resonance circuit and a related device, and relates to the technical field of circuit control, and the method comprises the steps: obtaining a target error value which is a difference value between a set value and a sampling value of a preset electrical parameter of the three-phase resonance circuit; and under the condition that the target error value is not 0, adjusting operation parameters of the three-phase resonant circuit to enable the target error value to be 0. And after the operation parameters are adjusted to preset values, if the target error value is still not 0, the working mode of the three-phase resonance circuit is switched from the current mode to a target mode, the target mode comprises a three-phase continuous mode, a three-phase hiccup mode, a two-phase hiccup mode or a two-phase variable duty ratio mode, closed-loop control of the three-phase resonance circuit in a full working range is achieved, and the working efficiency of the three-phase resonance circuit is improved. The stable output of the three-phase resonant circuit is ensured, and the problem that the switching loss and the driving loss of the three-phase resonant circuit are increased due to complete output frequency control is solved.

Description

Technical Field

[0001] The present application relates to the field of circuit control technology, and in particular to a control method and related devices for a three-phase resonant circuit. Background Art

[0002] The three-phase resonant circuit uses the resonance principle to optimize circuit performance. Its high-power output capability helps to achieve fast charging and is widely used in products such as charging piles.

[0003] At present, the three-phase resonant circuit is generally subjected to frequency conversion control to control the output frequency of the three-phase resonant circuit. The gain of the three-phase resonant circuit decreases with the increase of the output frequency in the monotonic range, but the higher the output frequency, the smaller the change in gain, and the output stability of the three-phase resonant circuit is reduced. Summary of the invention

[0004] In view of the above problems, the present application provides a control method and related device for a three-phase resonant circuit, which can effectively reduce the target error value between the set value and the sampled value of the preset electrical parameter of the three-phase resonant circuit, and achieve stable output of the three-phase resonant circuit. The specific scheme is as follows:

[0005] A first aspect of the present application provides a control method for a three-phase resonant circuit, comprising:

[0006] Obtaining a target error value, where the target error value is a difference between a set value and a sampled value of a preset electrical parameter of the three-phase resonant circuit;

[0007] When the target error value is not 0, adjusting the operating parameters of the three-phase resonant circuit so that the target error value is 0;

[0008] After the operating parameter is adjusted to the preset value, if the target error value is still not 0, the operating mode of the three-phase resonant circuit is switched from the current mode to the target mode, wherein the target mode includes: one of a three-phase continuous mode, a three-phase hiccup mode, a two-phase hiccup mode and a two-phase variable duty cycle mode.

[0009] In a possible implementation, when the current mode is the three-phase continuous mode, when the target error value is not 0, adjusting the operating parameters of the three-phase resonant circuit includes:

[0010] When the target error value is less than 0, increasing the output frequency of the three-phase resonant circuit;

[0011] After the operating parameter is adjusted to the preset value, if the target error value is still not 0, switching the operating mode of the three-phase resonant circuit from the current mode to the target mode includes:

[0012] When the output frequency of the three-phase resonant circuit has increased to a preset frequency upper limit value, if the target error value is still less than 0, the three-phase resonant circuit is controlled to switch from the three-phase continuous mode to the three-phase hiccup mode.

[0013] In a possible implementation, when the current mode is the three-phase continuous mode, when the target error value is not 0, adjusting the operating parameters of the three-phase resonant circuit includes:

[0014] When the target error value is greater than 0, the output frequency of the three-phase resonant circuit is reduced until the output frequency of the three-phase resonant circuit is reduced to a preset frequency lower limit value or the target error value is not greater than 0.

[0015] In a possible implementation, when the current mode is the three-phase hiccup mode, when the target error value is not 0, adjusting the operating parameters of the three-phase resonant circuit includes:

[0016] When the target error value is less than 0, shortening the hiccup time of the three-phase resonant circuit in the three-phase hiccup mode;

[0017] After the operating parameter is adjusted to the preset value, if the target error value is still not 0, switching the operating mode of the three-phase resonant circuit from the current mode to the target mode includes:

[0018] When the hiccup time in the three-phase hiccup mode is shortened to the first hiccup time lower limit, if the target error value is still less than 0, the three-phase resonant circuit is controlled to switch from the three-phase hiccup mode to the two-phase hiccup mode.

[0019] In a possible implementation, when the current mode is the three-phase hiccup mode, when the target error value is not 0, adjusting the operating parameters of the three-phase resonant circuit includes:

[0020] When the target error value is greater than 0, extending the hiccup time of the three-phase resonant circuit in the three-phase hiccup mode;

[0021] After the operating parameter is adjusted to the preset value, if the target error value is still not 0, switching the operating mode of the three-phase resonant circuit from the current mode to the target mode includes:

[0022] When the hiccup time in the three-phase hiccup mode is extended to the first hiccup time upper limit, if the target error value is still greater than 0, the three-phase resonant circuit is controlled to switch from the three-phase hiccup mode to the three-phase continuous mode.

[0023] In a possible implementation, when the current mode is the two-phase hiccup mode, when the target error value is not 0, adjusting the operating parameters of the three-phase resonant circuit includes:

[0024] When the target error value is less than 0, shortening the hiccup time of the three-phase resonant circuit in the two-phase hiccup mode;

[0025] After the operating parameter is adjusted to the preset value, if the target error value is still not 0, switching the operating mode of the three-phase resonant circuit from the current mode to the target mode includes:

[0026] When the hiccup time in the two-phase hiccup mode is shortened to the second hiccup time lower limit, if the target error value is still less than 0, the three-phase resonant circuit is controlled to switch from the two-phase hiccup mode to the two-phase variable duty cycle mode.

[0027] In a possible implementation, when the current mode is the two-phase hiccup mode, when the target error value is not 0, adjusting the operating parameters of the three-phase resonant circuit includes:

[0028] When the target error value is greater than 0, extending the hiccup time of the three-phase resonant circuit in the two-phase hiccup mode;

[0029] After the operating parameter is adjusted to the preset value, if the target error value is still not 0, switching the operating mode of the three-phase resonant circuit from the current mode to the target mode includes:

[0030] When the hiccup time in the two-phase hiccup mode is extended to the second hiccup time upper limit, if the target error value is still greater than 0, the three-phase resonant circuit is controlled to switch from the two-phase hiccup mode to the three-phase hiccup mode.

[0031] In a possible implementation, when the current mode is the two-phase variable duty cycle mode, when the target error value is not 0, adjusting the operating parameters of the three-phase resonant circuit includes:

[0032] When the target error value is greater than 0, increasing the output duty cycle of the three-phase resonant circuit;

[0033] After the operating parameter is adjusted to the preset value, if the target error value is still not 0, switching the operating mode of the three-phase resonant circuit from the current mode to the target mode includes:

[0034] When the output duty cycle of the three-phase resonant circuit has increased to a preset duty cycle upper limit value, if the target error value is still greater than 0, the three-phase resonant circuit is controlled to switch from the two-phase variable duty cycle mode to the two-phase hiccup mode.

[0035] In a possible implementation, when the current mode is the two-phase variable duty cycle mode, when the target error value is not 0, adjusting the operating parameters of the three-phase resonant circuit includes:

[0036] When the target error value is less than 0, reducing the output duty cycle of the three-phase resonant circuit;

[0037] The control method of the three-phase resonant circuit also includes:

[0038] In a case where the output duty cycle of the three-phase resonant circuit has been reduced to a preset duty cycle lower limit value, if the target error value is still less than 0, a wave-closing operation is performed on the three-phase resonant circuit.

[0039] In a possible implementation, when the current mode is the three-phase continuous mode, the target mode is the three-phase hiccup mode;

[0040] When the current mode is the three-phase hiccup mode, the target mode is the three-phase continuous mode or the two-phase hiccup mode;

[0041] When the current mode is the two-phase hiccup mode, the target mode is the three-phase hiccup mode or the two-phase variable duty cycle mode;

[0042] When the current mode is the two-phase variable duty cycle mode, the target mode is the two-phase hiccup mode.

[0043] A second aspect of the present application provides a controller, comprising: at least one processor and a memory connected to the processor, wherein:

[0044] The memory is used to store computer programs;

[0045] The processor is used to execute the computer program so that the controller can implement the control method of the three-phase resonant circuit as described in the first aspect or any implementation manner of the first aspect.

[0046] A third aspect of the present application provides a three-phase resonant circuit, comprising: a main circuit and the controller of the second aspect above;

[0047] The main circuit is connected to the controller.

[0048] A fourth aspect of the present application provides a charging pile, comprising the three-phase resonant circuit of the third aspect.

[0049] By means of the above technical scheme, the present application provides a control method and related devices for a three-phase resonant circuit. When the target error value is not 0, the operating parameters of the three-phase resonant circuit are adjusted to make the target error value 0. After the operating parameters are adjusted to the preset values, if the target error value is still not 0, the working mode of the three-phase resonant circuit is switched from the current mode to the target mode, and the target modes include three-phase continuous mode, three-phase hiccup mode, two-phase hiccup mode and two-phase variable duty cycle mode. That is, by adjusting the output frequency, three-phase hiccup time, two-phase hiccup time or output duty cycle of the three-phase resonant circuit in the two-phase working mode, the target error value is adjusted to realize closed-loop control of the three-phase resonant circuit within the full working range, thereby ensuring the stable output of the three-phase resonant circuit and solving the problem of increased switching loss and driving loss of the three-phase resonant circuit due to complete reliance on output frequency control. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and the originals and elements are not necessarily drawn to scale.

[0051] Figure 1 A schematic flow chart of a control method for a three-phase resonant circuit provided in an embodiment of the present application;

[0052] Figure 2 A schematic diagram of the control logic of a three-phase resonant circuit provided in an embodiment of the present application;

[0053] Figure 3 A schematic diagram of switching four major control modes of a three-phase resonant circuit provided in an embodiment of the present application;

[0054] Figure 4 A schematic diagram of the structure of a control device for a three-phase resonant circuit provided in an embodiment of the present application;

[0055] Figure 5 A schematic diagram of the structure of a controller provided in an embodiment of the present application. DETAILED DESCRIPTION

[0056] The following describes the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. The terms used in the implementation method section of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

[0057] The embodiments of the present application are described below in conjunction with the accompanying drawings. Those skilled in the art will appreciate that, with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0058] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and need not be used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, which is only to describe the distinction mode adopted by the objects of the same attributes when describing in the embodiments of the present application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0059] The embodiment of the present application provides a control method for a three-phase resonant circuit. The control method for a three-phase resonant circuit in the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0060] Reference Figure 1 , Figure 1 A flow chart of a control method for a three-phase resonant circuit provided in an embodiment of the present application is shown as follows: Figure 1 As shown, a control method for a three-phase resonant circuit provided in an embodiment of the present application may include steps 101 to 103, and these steps are described in detail below.

[0061] 101: Obtain a target error value, where the target error value is a difference between a set value and a sampled value of a preset electrical parameter of the three-phase resonant circuit.

[0062] The three-phase resonant circuit may be a three-phase LLC (Inductor-Inductor-Capacitor) circuit, a three-phase CLC (Capacitor-Inductor-Capacitor) circuit, or the like.

[0063] The preset electrical parameter may be current, voltage, or an electrical parameter with the smallest difference between a set value and a sampled value.

[0064] In one possible implementation, see Figure 2 , calculate the voltage setting value u ref And the voltage sampling value u adc The difference u err , and calculate the current setting value i ref And the current sampling value i adc The difference i err , will u err and i err The minimum value MIN(u err ,i err ) is determined as the target error value err.

[0065] 102: When the target error value is not 0, adjust the operating parameters of the three-phase resonant circuit to make the target error value 0.

[0066] In the embodiment of the present application, the three-phase resonant circuit has multiple working modes, for example: three-phase continuous mode, three-phase hiccup mode, two-phase hiccup mode and two-phase variable duty cycle mode. Among them, the three-phase continuous mode means that the three phases of the three-phase resonant circuit are all working and continuously emitting waves (such as continuously outputting PWM waves), and the frequency is adjustable; the three-phase hiccup mode means that the three phases of the three-phase resonant circuit are all working and non-continuously emitting waves (emitting waves is called hiccups, and the sum of the hiccup time and the non-hiccup time is the hiccup control period), and the frequency is not adjustable; the two-phase hiccup mode means that the two phases of the three-phase resonant circuit work and emit waves non-continuously (emitting waves is called hiccups, and the sum of the hiccup time and the non-hiccup time is the hiccup control period), and the frequency is not adjustable; the two-phase variable duty cycle mode means that the two phases of the three-phase resonant circuit work, the frequency is not adjustable, and the duty cycle is adjustable.

[0067] The operating parameters of the three-phase resonant circuit adjusted in different working modes are different, for example:

[0068] If the current mode of the three-phase resonant circuit is the three-phase continuous mode, adjusting the output frequency of the three-phase resonant circuit;

[0069] If the current mode of the three-phase resonant circuit is the three-phase hiccup mode, adjusting the hiccup time of the three-phase resonant circuit in the three-phase hiccup mode;

[0070] If the current mode of the three-phase resonant circuit is the two-phase hiccup mode, adjusting the hiccup time of the three-phase resonant circuit in the two-phase hiccup mode;

[0071] If the current mode of the three-phase resonant circuit is the two-phase variable duty cycle mode, the output duty cycle of the three-phase resonant circuit is adjusted.

[0072] In a possible implementation, when the current mode is a three-phase continuous mode, refer to Figure 2 When the target error value err is not 0, the controller generates a control signal for making err=0 according to the target error value err, and then performs frequency conversion on the control signal to obtain an adjusted frequency f, and then performs closed-loop control on the three-phase resonant circuit based on the frequency to make the target error value err 0.

[0073] 103: After the operating parameter is adjusted to the preset value, if the target error value is still not 0, the operating mode of the three-phase resonant circuit is switched from the current mode to the target mode.

[0074] The target mode includes: one of a three-phase continuous mode, a three-phase hiccup mode, a two-phase hiccup mode and a two-phase variable duty cycle mode, and the initial mode of the three-phase resonant circuit is the three-phase continuous mode.

[0075] In a possible implementation, when the current mode is a three-phase continuous mode, refer to Figure 2 In the process of adjusting the frequency, if the target error value err is still not 0 after the frequency reaches the preset value, the working mode of the three-phase resonant circuit is switched from the three-phase continuous mode to the target mode, that is, in the three-phase continuous mode, whether the working mode of the three-phase resonant circuit needs to be switched is determined based on factors such as frequency. Among them, the target mode can be a three-phase hiccup mode or a two-phase hiccup mode or a two-phase variable duty cycle mode. By shortening the hiccup time in the three-phase hiccup mode or shortening the hiccup time in the two-phase hiccup mode or reducing the output duty cycle of the two-phase operation, the target error value is continuously reduced to achieve a stable output of the three-phase resonant circuit, and the output frequency of the three-phase resonant circuit does not increase after increasing to the preset frequency upper limit value, thereby reducing the switching loss and driving loss of the three-phase resonant circuit.

[0076] Although controlling the three-phase resonant circuit to switch from the three-phase continuous mode to any of the three-phase hiccup mode, the two-phase hiccup mode, and the two-phase variable duty cycle mode can achieve the purpose of reducing the target error value, the mode switching method of controlling the three-phase resonant circuit to switch from the three-phase continuous mode to the three-phase hiccup mode is smoother and can be used as a preferred mode switching method.

[0077] Similarly, after the operating parameters in the three-phase hiccup mode are adjusted to the preset values, if the target error value is still not 0, the three-phase resonant circuit can be switched from the three-phase hiccup mode to the two-phase hiccup mode or the two-phase variable duty cycle mode, which can achieve the purpose of reducing the target error value. However, the mode switching method of controlling the three-phase resonant circuit to switch from the three-phase hiccup mode to the two-phase hiccup mode is smoother and can be used as a preferred mode switching method.

[0078] As an optional implementation: when the current mode is the three-phase continuous mode, the target mode is the three-phase hiccup mode;

[0079] When the current mode is the three-phase hiccup mode, the target mode is the three-phase continuous mode or the two-phase hiccup mode;

[0080] When the current mode is the two-phase hiccup mode, the target mode is the three-phase hiccup mode or the two-phase variable duty cycle mode;

[0081] In case the current mode is the two-phase variable duty cycle mode, the target mode is the two-phase hiccup mode.

[0082] The working mode switching sequence of the three-phase resonant circuit is: three-phase continuous mode-three-phase hiccup mode-two-phase hiccup mode-two-phase duty cycle mode. Under this working mode switching sequence, the gain shows a monotonic change trend, covering the full range of output conditions of the three-phase resonant circuit, and can achieve a full range of control output from light load to full load under a wider voltage range, effectively reducing light load and no-load ripple, and improving output stability at light load and no-load.

[0083] Since the operating parameters of the three-phase resonant circuit adjusted in different working modes are different, and the directions of the operating parameter adjustment are different when the target error value is less than 0 and when the target error value is greater than 0, the types of preset values ​​to which the operating parameters of the three-phase resonant circuit are adjusted in different working modes are different, and in the same working mode, the preset values ​​corresponding to the target error value less than 0 and the target error value greater than 0 are different in size.

[0084] For example: if the current mode of the three-phase resonant circuit is the three-phase hiccup mode, the adjusted operating parameter is the hiccup time of the three-phase resonant circuit in the three-phase hiccup mode. When the target error value is less than 0, the hiccup time of the three-phase resonant circuit in the three-phase hiccup mode is shortened. When the hiccup time of the three-phase resonant circuit in the three-phase hiccup mode is shortened to a preset value (the first hiccup time lower limit), if the target error value is still less than 0, the working mode of the three-phase resonant circuit is switched from the three-phase hiccup mode to the two-phase hiccup mode; when the target error value is greater than 0, the hiccup time of the three-phase resonant circuit in the three-phase hiccup mode is extended. When the hiccup time of the three-phase resonant circuit in the three-phase hiccup mode is extended to a preset value (the first hiccup time upper limit), if the target error value is still greater than 0, the working mode of the three-phase resonant circuit is switched from the three-phase hiccup mode to the three-phase continuous mode.

[0085] It can be seen that the control method of a three-phase resonant circuit disclosed in this embodiment adjusts the operating parameters of the three-phase resonant circuit to make the target error value 0 when the target error value is not 0. After the operating parameters are adjusted to the preset values, if the target error value is still not 0, the operating mode of the three-phase resonant circuit is switched from the current mode to the target mode, and the target modes include three-phase continuous mode, three-phase hiccup mode, two-phase hiccup mode and two-phase variable duty cycle mode. That is, by adjusting the output frequency, three-phase hiccup time, two-phase hiccup time or output duty cycle of the three-phase resonant circuit in the two-phase operating mode, the target error value is adjusted to achieve closed-loop control of the three-phase resonant circuit within the full operating range, thereby ensuring the stable output of the three-phase resonant circuit and solving the problem of increased switching loss and driving loss of the three-phase resonant circuit due to complete reliance on output frequency control.

[0086] The following is a detailed introduction taking the working mode switching sequence of the three-phase resonant circuit: three-phase continuous mode-three-phase hiccup mode-two-phase hiccup mode-two-phase variable duty cycle mode as an example.

[0087] like Figure 3 As shown, the initial mode of the three-phase resonant circuit is the three-phase continuous mode. If the target error value is less than 0 and the output frequency of the three-phase resonant circuit is less than the preset frequency upper limit value, the three-phase resonant circuit is in the three-phase continuous mode. In the three-phase continuous mode, the three-phase resonant circuit operates in three phases, and there is no hiccup time. The output duty cycle remains unchanged, and the output duty cycle is the preset duty cycle ( Figure 3 The output duty cycle is 50% as an example), and the target error value is adjusted by adjusting the output frequency. The frequency adjustment range is the preset frequency lower limit value f min To the preset frequency upper limit value f max If the target error value is equal to 0, it means that the actual output value of the three-phase resonant circuit is equal to the set value, and there is no need to switch the control mode. If the target error value is greater than 0, it means that the actual output value of the three-phase resonant circuit is less than the set value, and the output frequency is adjusted to a low frequency, that is, the output frequency of the three-phase resonant circuit is reduced. When the output frequency is reduced to the preset frequency lower limit value f min If the target error value is still greater than 0, the output frequency will not be adjusted and the mode will not be switched. If the target error value is less than 0, it means that the actual output value of the three-phase resonant circuit is greater than the set value, and the frequency is adjusted to a high frequency, that is, the output frequency of the three-phase resonant circuit is increased. When the output frequency increases to the preset frequency upper limit value f max , and the target error value is still less than 0, the three-phase resonant circuit is controlled to switch from the three-phase continuous mode to the three-phase hiccup mode. The above preset frequency upper limit value f max and preset frequency lower limit f min Set according to the specific application scenario.

[0088] In the three-phase hiccup mode, the three-phase resonant circuit works in three phases, the output duty cycle remains unchanged, and the output is output at the preset duty cycle. The output frequency also remains unchanged, always at f max Output, by adjusting the hiccup time of the three-phase resonant circuit in the three-phase hiccup mode to adjust the target error value, the adjustment range of the hiccup time is the first hiccup time lower limit t min1 To the first hiccup time upper limit t max1 If the target error value is less than 0, shorten the hiccup time, that is, the hiccup time t is moved toward the first hiccup time lower limit t min1 When t is equal to t min1 , and the target error value is still less than 0, the three-phase resonant circuit is controlled to switch from the three-phase hiccup mode to the two-phase hiccup mode. The first hiccup time lower limit value t min1 and the first hiccup time upper limit t max1Set according to the specific application scenario.

[0089] In the two-phase hiccup mode, the three-phase resonant circuit works in two phases, the output duty cycle remains unchanged, and the output is output at the preset duty cycle. The output frequency remains unchanged and is always f max Output, compared with the three-phase hiccup mode, the three-phase resonant circuit switches from three-phase operation to two-phase operation. The target error value is adjusted by adjusting the hiccup time of the three-phase resonant circuit in the two-phase hiccup mode. The adjustment range of the hiccup time is the second hiccup time lower limit t min2 To the second hiccup time upper limit t max2 If the target error value is less than 0, shorten the hiccup time, that is, the hiccup time t is moved toward the second hiccup time lower limit t min2 When t is equal to t min2 , and the target error value is still less than 0, the three-phase resonant circuit is controlled to switch from the two-phase hiccup mode to the two-phase variable duty cycle mode. The second hiccup time lower limit t min2 and the second hiccup time upper limit t max2 Set according to the specific application scenario.

[0090] In the above three-phase hiccup mode and two-phase hiccup mode, the three-phase resonant circuit does not work continuously, that is, it emits waves discontinuously. Taking PWM wave emission as an example, the time of PWM wave emission (i.e. hiccup time) + the time of stopping PWM wave emission (i.e. shutdown time) = hiccup cycle. In the three-phase hiccup mode and two-phase hiccup mode, by shortening the hiccup time and reducing the continuous wave emission time of the three-phase resonant circuit, the output voltage and output current of the three-phase resonant circuit can be significantly reduced, thereby further reducing the target error value.

[0091] In the two-phase variable duty cycle mode, the three-phase resonant circuit operates in two phases, and the output frequency remains unchanged, always at f max Output, hiccup time remains unchanged, and is always the second hiccup time lower limit t min2 In the two-phase variable duty cycle mode, the target error value is adjusted by adjusting the output duty cycle of the three-phase resonant circuit, and the duty cycle adjustment range is the preset duty cycle lower limit value d min To the preset duty cycle upper limit d max If the target error value is less than 0, the output duty cycle d is reduced, that is, the output duty cycle d is moved toward the preset duty cycle lower limit d min Direction adjustment: By reducing the output duty cycle, the conduction time of the switching device (such as MOSFET) in one switching cycle is reduced, and the output voltage and output current of the three-phase resonant circuit are reduced, thereby continuing to reduce the target error value.

[0092] Due to the introduction of the two-phase hiccup mode and the two-phase variable duty cycle mode, the hiccup working range is reduced, the ripple performance under low voltage and light load is improved, the working range of the inductive zone is increased, and the overall machine loss and thermal performance indicators are reduced.

[0093] Furthermore, in the two-phase variable duty cycle mode, if the output duty cycle d decreases to the preset duty cycle lower limit d min When the target error value is still less than 0, the three-phase resonant circuit is subjected to the wave-closing operation (i.e., all switches of the three-phase resonant circuit are turned off). After the wave-closing operation is performed, when the target error value is greater than 0, the wave-closing operation is stopped and the control logic of the two-phase variable duty cycle mode is continued.

[0094] Furthermore, the three-phase continuous mode-three-phase hiccup mode-two-phase hiccup mode-two-phase variable duty cycle mode can also be switched in reverse.

[0095] Specifically, in the two-phase variable duty cycle mode, the three-phase resonant circuit operates in two phases, and the output frequency remains unchanged, always at f max Output, hiccup time remains unchanged, and is always the second hiccup time lower limit t min2 If the target error value is greater than 0, the output duty cycle d will go to the preset duty cycle upper limit d max Direction adjustment. When d is d max , and when the target error value is still greater than 0, the three-phase resonant circuit is controlled to switch from the two-phase variable duty cycle mode to the two-phase hiccup mode.

[0096] In the two-phase hiccup mode, the three-phase resonant circuit operates in two phases, the output duty cycle remains unchanged, and the output is output at the preset duty cycle. The output frequency remains unchanged and is always f max Output. If the target error value is greater than 0, the hiccup time is extended, that is, the hiccup time t is increased to the second hiccup time upper limit t max2 When t is t max2 , and the target error value is still greater than 0, the three-phase resonant circuit is controlled to switch from the two-phase hiccup mode to the three-phase hiccup mode.

[0097] In the three-phase hiccup mode, the three-phase resonant circuit operates in three phases, the output duty cycle remains unchanged, and the output is output at the preset duty cycle. The output frequency remains unchanged and is always f max Output. If the target error value is greater than 0, the hiccup time is extended, that is, the hiccup time t is increased to the first hiccup time upper limit t max1 When t is t max1 , and when the target error value is still greater than 0, the three-phase resonant circuit is controlled to switch from the three-phase hiccup mode to the three-phase continuous mode.

[0098] It can be seen that the control method of the three-phase resonant circuit disclosed in this embodiment has a hysteresis region between the two modes. For example, when the output duty cycle in the two-phase variable duty cycle mode increases to d max , and the target error value is still greater than 0, it will switch to the two-phase hiccup mode; the hiccup time in the two-phase hiccup mode is shortened to t min2 , and the target error value is still less than 0, it will switch to the two-phase variable duty cycle mode, and the hiccup time will be extended to t max2 , and the target error value is still greater than 0, it will switch to the three-phase hiccup mode; the hiccup time in the three-phase hiccup mode is shortened to t min1 , and the target error value is still less than 0, it will switch to the two-phase hiccup mode, and the hiccup time will be extended to t max1 , and the target error value is still greater than 0, it will switch to the three-phase continuous mode to avoid the three-phase resonant circuit from switching frequently between the two modes, increasing the selectivity of steady-state operation. With the cooperation of the controller, it can increase the working range of the inductive zone, reduce switching losses, and improve the efficiency of the whole machine.

[0099] A control method for a three-phase resonant circuit provided in an embodiment of the present application is introduced above, and a device for executing the control method for the three-phase resonant circuit is introduced below.

[0100] See also Figure 4 , Figure 4 This is a schematic diagram of the structure of a control device for a three-phase resonant circuit provided in an embodiment of the present application. Figure 4 As shown, the control device of the three-phase resonant circuit includes:

[0101] An acquisition module 401 is used to acquire a target error value, where the target error value is a difference between a set value and a sampled value of a preset electrical parameter of a three-phase resonant circuit;

[0102] An adjustment module 402, configured to adjust the operating parameters of the three-phase resonant circuit so that the target error value is 0 when the target error value is not 0;

[0103] The switching module 403 is used to switch the operating mode of the three-phase resonant circuit from the current mode to the target mode after the operating parameter is adjusted to the preset value, if the target error value is still not 0, wherein the target mode includes: one of: a three-phase continuous mode, a three-phase hiccup mode, a two-phase hiccup mode and a two-phase variable duty cycle mode.

[0104] In a possible implementation, when the current mode is the three-phase continuous mode, the adjustment module 402 is specifically configured to increase the output frequency of the three-phase resonant circuit when the target error value is less than 0;

[0105] The switching module 403 is specifically used to control the three-phase resonant circuit to switch from the three-phase continuous mode to the three-phase hiccup mode when the output frequency of the three-phase resonant circuit has increased to a preset frequency upper limit value and if the target error value is still less than 0.

[0106] In one possible implementation, when the current mode is the three-phase continuous mode, the adjustment module 402 is specifically used to reduce the output frequency of the three-phase resonant circuit when the target error value is greater than 0, until the output frequency of the three-phase resonant circuit is reduced to a preset frequency lower limit value or the target error value is not greater than 0.

[0107] In a possible implementation, when the current mode is the three-phase hiccup mode, the adjustment module 402 is specifically configured to shorten the hiccup time of the three-phase resonant circuit in the three-phase hiccup mode when the target error value is less than 0;

[0108] The switching module 403 is specifically used to control the three-phase resonant circuit to switch from the three-phase hiccup mode to the two-phase hiccup mode when the hiccup time in the three-phase hiccup mode is shortened to the first hiccup time lower limit value and if the target error value is still less than 0.

[0109] In a possible implementation, when the current mode is the three-phase hiccup mode, the adjustment module 402 is specifically configured to extend the hiccup time of the three-phase resonant circuit in the three-phase hiccup mode when the target error value is greater than 0;

[0110] The switching module 403 is specifically used to control the three-phase resonant circuit to switch from the three-phase hiccup mode to the three-phase continuous mode when the hiccup time in the three-phase hiccup mode is extended to the first hiccup time upper limit value and if the target error value is still greater than 0.

[0111] In a possible implementation, when the current mode is the two-phase hiccup mode, the adjustment module 402 is specifically configured to shorten the hiccup time of the three-phase resonant circuit in the two-phase hiccup mode when the target error value is less than 0;

[0112] The switching module 403 is specifically used to control the three-phase resonant circuit to switch from the two-phase hiccup mode to the two-phase variable duty cycle mode when the hiccup time in the two-phase hiccup mode is shortened to the second hiccup time lower limit value and if the target error value is still less than 0.

[0113] In a possible implementation, when the current mode is the two-phase hiccup mode, the adjustment module 402 is specifically configured to extend the hiccup time of the three-phase resonant circuit in the two-phase hiccup mode when the target error value is greater than 0;

[0114] The switching module 403 is specifically used to control the three-phase resonant circuit to switch from the two-phase hiccup mode to the three-phase hiccup mode when the hiccup time in the two-phase hiccup mode is extended to the second hiccup time upper limit value and if the target error value is still greater than 0.

[0115] In a possible implementation, when the current mode is the two-phase variable duty cycle mode, the adjustment module 402 is specifically configured to increase the output duty cycle of the three-phase resonant circuit when the target error value is greater than 0;

[0116] The switching module 403 is specifically used to control the three-phase resonant circuit to switch from the two-phase variable duty cycle mode to the two-phase hiccup mode when the output duty cycle of the three-phase resonant circuit has increased to a preset duty cycle upper limit value and if the target error value is still greater than 0.

[0117] In a possible implementation, when the current mode is the two-phase variable duty cycle mode, the adjustment module 402 reduces the output duty cycle of the three-phase resonant circuit when the target error value is less than 0;

[0118] The device for controlling the three-phase resonant circuit also includes:

[0119] The execution module is used to perform a wave-sealing operation on the three-phase resonant circuit when the output duty cycle of the three-phase resonant circuit has been reduced to a preset duty cycle lower limit value and the target error value is still less than 0.

[0120] In a possible implementation, when the current mode is the three-phase continuous mode, the target mode is the three-phase hiccup mode;

[0121] When the current mode is the three-phase hiccup mode, the target mode is the three-phase continuous mode or the two-phase hiccup mode;

[0122] When the current mode is the two-phase hiccup mode, the target mode is the three-phase hiccup mode or the two-phase variable duty cycle mode;

[0123] When the current mode is the two-phase variable duty cycle mode, the target mode is the two-phase hiccup mode.

[0124] The present embodiment discloses a control device for a three-phase resonant circuit. When a target error value is not 0, the operating parameters of the three-phase resonant circuit are adjusted to make the target error value 0. After the operating parameters are adjusted to preset values, if the target error value is still not 0, the operating mode of the three-phase resonant circuit is switched from the current mode to the target mode. The target modes include a three-phase continuous mode, a three-phase hiccup mode, a two-phase hiccup mode and a two-phase variable duty cycle mode. That is, the target error value is adjusted by adjusting the output frequency, the three-phase hiccup time, the two-phase hiccup time or the output duty cycle in the two-phase operating mode of the three-phase resonant circuit, so as to realize closed-loop control of the three-phase resonant circuit within the full operating range, ensure the stable output of the three-phase resonant circuit, and solve the problem of increased switching loss and driving loss of the three-phase resonant circuit due to complete reliance on output frequency control.

[0125] The present application also provides a controller in an embodiment. Figure 5 As shown, it shows a structural schematic diagram of a controller suitable for implementing the embodiments of the present application. Figure 5 The controller shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0126] like Figure 5 As shown, the controller may include a bus 501, a processor 502, a communication interface 503 and a memory 504. The processor 502, the memory 504 and the communication interface 503 communicate with each other via the bus 501.

[0127] The bus 501 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 5 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0128] The processor 502 may be any one or more processors such as an MCU (Microcontroller Unit), a DSP (Digital Signal Processor), etc.

[0129] The memory 504 may include a volatile memory, such as a random access memory (RAM), or a non-volatile memory, such as a read-only memory (ROM), a flash memory, etc.

[0130] The memory 504 may be used to store software codes related to the control method of the three-phase resonant circuit, and the processor 502 may execute the steps of the control method of the three-phase resonant circuit, and may also schedule other units to implement corresponding functions.

[0131] The embodiment of the present application also provides a three-phase resonant circuit, comprising: a main circuit and the controller provided in the above embodiment;

[0132] The main circuit is connected to the controller;

[0133] Among them, the main circuit can be a three-phase LLC circuit, a three-phase CLC circuit, etc.

[0134] A charging pile is also provided in an embodiment of the present application, comprising the three-phase resonant circuit provided in the above embodiment.

[0135] Although not shown, the charging pile may also include a charging pile body, a charging gun, a display screen, etc., which will not be described in detail here.

[0136] An embodiment of the present application also provides a computer program product including computer-readable instructions. When the computer-readable instructions are executed on a controller, the controller implements any one of the control methods for a three-phase resonant circuit provided in the embodiment of the present application.

[0137] A computer-readable storage medium is also provided in an embodiment of the present application. The storage medium carries one or more computer programs. When the one or more computer programs are executed by a controller, the controller can implement any control method of a three-phase resonant circuit provided in an embodiment of the present application.

[0138] It should also be noted that the device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed over multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the drawings of the device embodiments provided by the present application, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines.

[0139] Through the description of the above implementation mode, the technicians in the field can clearly understand that the present application can be implemented by means of software plus necessary general hardware, and of course, it can also be implemented by special hardware including special integrated circuits, special CPUs, special memories, special components, etc. In general, all functions completed by computer programs can be easily implemented by corresponding hardware, and the specific hardware structure used to implement the same function can also be various, such as analog circuits, digital circuits or special circuits. However, for the present application, software program implementation is a better implementation mode in more cases. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a readable storage medium, such as a computer floppy disk, a U disk, a mobile hard disk, a ROM, a RAM, a disk or an optical disk, etc., including a number of instructions to enable a computer device (which can be a personal computer, a training device, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0140] In the above embodiments, all or part of the embodiments may be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments may be implemented in the form of a computer program product.

[0141] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website site, a computer, a training device, or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, training device, or data center. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a training device, a data center, etc. that includes one or more available media integrations. The available medium may be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)), etc.

Claims

1. A control method for a three-phase resonant circuit, characterized in that: include: Obtaining a target error value, where the target error value is a difference between a set value and a sampled value of a preset electrical parameter of the three-phase resonant circuit; When the target error value is not 0, adjusting the operating parameters of the three-phase resonant circuit so that the target error value is 0; After the operating parameter is adjusted to the preset value, if the target error value is still not 0, the operating mode of the three-phase resonant circuit is switched from the current mode to the target mode, wherein the target mode includes: one of a three-phase continuous mode, a three-phase hiccup mode, a two-phase hiccup mode and a two-phase variable duty cycle mode.

2. The control method of the three-phase resonant circuit according to claim 1, characterized in that: When the current mode is the three-phase continuous mode, and when the target error value is not 0, adjusting the operating parameters of the three-phase resonant circuit includes: When the target error value is less than 0, increasing the output frequency of the three-phase resonant circuit; After the operating parameter is adjusted to the preset value, if the target error value is still not 0, switching the operating mode of the three-phase resonant circuit from the current mode to the target mode includes: When the output frequency of the three-phase resonant circuit has increased to a preset frequency upper limit value, if the target error value is still less than 0, the three-phase resonant circuit is controlled to switch from the three-phase continuous mode to the three-phase hiccup mode.

3. The control method of the three-phase resonant circuit according to claim 1, characterized in that: When the current mode is the three-phase continuous mode, and when the target error value is not 0, adjusting the operating parameters of the three-phase resonant circuit includes: When the target error value is greater than 0, the output frequency of the three-phase resonant circuit is reduced until the output frequency of the three-phase resonant circuit is reduced to a preset frequency lower limit value or the target error value is not greater than 0.

4. The control method of the three-phase resonant circuit according to claim 1, characterized in that: When the current mode is the three-phase hiccup mode, and when the target error value is not 0, adjusting the operating parameters of the three-phase resonant circuit includes: When the target error value is less than 0, shortening the hiccup time of the three-phase resonant circuit in the three-phase hiccup mode; After the operating parameter is adjusted to the preset value, if the target error value is still not 0, switching the operating mode of the three-phase resonant circuit from the current mode to the target mode includes: When the hiccup time in the three-phase hiccup mode is shortened to the first hiccup time lower limit, if the target error value is still less than 0, the three-phase resonant circuit is controlled to switch from the three-phase hiccup mode to the two-phase hiccup mode.

5. The control method of the three-phase resonant circuit according to claim 1, characterized in that: When the current mode is the three-phase hiccup mode, and when the target error value is not 0, adjusting the operating parameters of the three-phase resonant circuit includes: When the target error value is greater than 0, extending the hiccup time of the three-phase resonant circuit in the three-phase hiccup mode; After the operating parameter is adjusted to the preset value, if the target error value is still not 0, switching the operating mode of the three-phase resonant circuit from the current mode to the target mode includes: When the hiccup time in the three-phase hiccup mode is extended to the first hiccup time upper limit, if the target error value is still greater than 0, the three-phase resonant circuit is controlled to switch from the three-phase hiccup mode to the three-phase continuous mode.

6. The control method of the three-phase resonant circuit according to claim 1, characterized in that: When the current mode is the two-phase hiccup mode, and when the target error value is not 0, adjusting the operating parameters of the three-phase resonant circuit includes: When the target error value is less than 0, shortening the hiccup time of the three-phase resonant circuit in the two-phase hiccup mode; After the operating parameter is adjusted to the preset value, if the target error value is still not 0, switching the operating mode of the three-phase resonant circuit from the current mode to the target mode includes: When the hiccup time in the two-phase hiccup mode is shortened to the second hiccup time lower limit, if the target error value is still less than 0, the three-phase resonant circuit is controlled to switch from the two-phase hiccup mode to the two-phase variable duty cycle mode.

7. The control method of the three-phase resonant circuit according to claim 1, characterized in that: When the current mode is the two-phase hiccup mode, and when the target error value is not 0, adjusting the operating parameters of the three-phase resonant circuit includes: When the target error value is greater than 0, extending the hiccup time of the three-phase resonant circuit in the two-phase hiccup mode; After the operating parameter is adjusted to the preset value, if the target error value is still not 0, switching the operating mode of the three-phase resonant circuit from the current mode to the target mode includes: When the hiccup time in the two-phase hiccup mode is extended to the second hiccup time upper limit, if the target error value is still greater than 0, the three-phase resonant circuit is controlled to switch from the two-phase hiccup mode to the three-phase hiccup mode.

8. The control method of the three-phase resonant circuit according to claim 1, characterized in that: When the current mode is the two-phase variable duty cycle mode, and when the target error value is not 0, adjusting the operating parameters of the three-phase resonant circuit includes: When the target error value is greater than 0, increasing the output duty cycle of the three-phase resonant circuit; After the operating parameter is adjusted to the preset value, if the target error value is still not 0, switching the operating mode of the three-phase resonant circuit from the current mode to the target mode includes: When the output duty cycle of the three-phase resonant circuit has increased to a preset duty cycle upper limit value, if the target error value is still greater than 0, the three-phase resonant circuit is controlled to switch from the two-phase variable duty cycle mode to the two-phase hiccup mode.

9. The control method of the three-phase resonant circuit according to claim 1, characterized in that: When the current mode is the two-phase variable duty cycle mode, and when the target error value is not 0, adjusting the operating parameters of the three-phase resonant circuit includes: When the target error value is less than 0, reducing the output duty cycle of the three-phase resonant circuit; The control method of the three-phase resonant circuit also includes: In a case where the output duty cycle of the three-phase resonant circuit has been reduced to a preset duty cycle lower limit value, if the target error value is still less than 0, a wave-closing operation is performed on the three-phase resonant circuit.

10. The control method of the three-phase resonant circuit according to claim 1, characterized in that: When the current mode is the three-phase continuous mode, the target mode is the three-phase hiccup mode; When the current mode is the three-phase hiccup mode, the target mode is the three-phase continuous mode or the two-phase hiccup mode; When the current mode is the two-phase hiccup mode, the target mode is the three-phase hiccup mode or the two-phase variable duty cycle mode; When the current mode is the two-phase variable duty cycle mode, the target mode is the two-phase hiccup mode.

11. A controller, characterized in that: The method comprises at least one processor and a memory connected to the processor, wherein: The memory is used to store computer programs; The processor is used to execute the computer program so that the controller can implement the control method of the three-phase resonant circuit according to any one of claims 1 to 10.

12. A three-phase resonant circuit, characterized in that: include: A main circuit and a controller as claimed in claim 11; The main circuit is connected to the controller.

13. A charging pile, characterized in that: Includes the three-phase resonant circuit as claimed in claim 12.

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