Wide-range resonant converter device with auxiliary winding on primary side

Abstract

The invention discloses a wide-range resonant converter device with an auxiliary winding on a primary side, and belongs to the technical field of power electronics, the wide-range resonant converter device comprises a direct-current power supply, a switching circuit, a resonant circuit, a rectifying circuit and a filter circuit which are connected in sequence, and the switching circuit comprises two switching modules which are arranged in parallel; the resonant circuit comprises two resonant tanks and a two-phase transformer; the rectifying circuit comprises two rectifying modules which are arranged in parallel; the filter circuit is connected with an output load; the switching circuit receives the control of an external control signal and has two modes: the square wave voltages generated by the two switching modules are in the same phase, or the square wave voltages generated by the two switching modules are in the opposite phase; primary side windings of the two-phase transformer comprise primary side main windings and primary side auxiliary windings; the first switch module is connected with the primary side auxiliary winding of the second phase transformer, and the second switch module is connected with the primary side auxiliary winding of the first phase transformer. According to the invention, the problem that the resonant converter is difficult to realize wide-range output is solved, and the output range can be flexibly adjusted.

Description

Technical Field

[0001] The invention relates to the technical field of power electronics, in particular to a wide-range resonant converter device with an auxiliary winding on the primary side. Background Art

[0002] Resonant converters can be divided into series resonant converters, parallel resonant converters and series-parallel resonant converters according to the connection mode of the resonant elements. Resonant converters are widely used because of their simple structure, high efficiency, high power density, and the ability of switching devices to achieve soft switching, thereby significantly reducing switching losses and improving efficiency.

[0003] Although the resonant converter has so many advantages, the output range of the resonant converter is limited and the output voltage can only be adjusted within a small range. Figure 1 As shown in the figure, the most basic series-parallel resonant converter, the half-bridge LLC resonant converter, is used as an example. Frequency modulation control is used to adjust the gain and then the output voltage by adjusting the resonant frequency. The output adjustment range of the half-bridge LLC resonant converter is limited, usually about 1.2 to 0.8 times the rated voltage. Therefore, when the output rated voltage of the resonant converter is Vo, the output adjustment range of the resonant converter is 1.2*Vo-0.8*Vo, and the output range is indeed limited.

[0004] In order to solve the problem of narrow output range, such as Figure 2 As shown, the two Figure 1 The secondary sides of the half-bridge converters are connected in series, Figure 2 The output rated voltage of the resonant converter becomes Figure 1 The output voltage is twice that of the converter, the rated output voltage is 2Vo, and the output adjustment range is also changed to Figure 1 The converter is twice as powerful, 2.4*Vo-1.6*Vo. Although the output voltage range is larger, the increase in rated voltage will change the application scenario, and the problem of narrow output range is not solved in essence. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a wide-range resonant converter device with an auxiliary winding on the primary side, so as to solve the problem of narrow output range of the current resonant converter.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: A wide-range resonant converter device with an auxiliary winding on the primary side comprises a DC power supply, a switch circuit, a resonant circuit, a rectifier circuit and a filter circuit connected in sequence, wherein the switch circuit comprises a first switch module and a second switch module arranged in parallel; the resonant circuit comprises a resonant tank and a transformer, wherein the resonant tank comprises a first resonant tank and a second resonant tank; the transformer comprises a first phase transformer and a second phase transformer; the rectifier circuit comprises a first rectifier module and a second rectifier module arranged in parallel; the filter circuit is connected to an output load; The switch circuit receives control of an external control signal, and has two modes: the square wave voltages generated by the first switch module and the second switch module are in phase, or the square wave voltages generated by the first switch module and the second switch module are in opposite phases; The primary windings of the first phase transformer and the second phase transformer both include a primary main winding and a primary auxiliary winding; the first switch module is connected to the primary auxiliary winding of the second phase transformer, and the second switch module is connected to the primary auxiliary winding of the first phase transformer.

[0007] A further improvement of the technical solution of the present invention is that: the specific connection method of the resonant converter device is as follows: the first switch module is connected to one end of the first resonant slot, the other end of the first resonant slot is connected to the same-name end of the primary-side main winding of the first-phase transformer, the non-same-name end of the primary-side main winding of the first-phase transformer is connected to the non-same-name end of the primary-side auxiliary winding of the second-phase transformer, and the same-name end of the primary-side auxiliary winding of the second-phase transformer is connected to the other end of the first switch module; the second switch module is connected to one end of the second resonant slot, the other end of the second resonant slot is connected to the same-name end of the primary-side main winding of the second-phase transformer, the non-same-name end of the primary-side main winding of the second-phase transformer is connected to the non-same-name end of the primary-side auxiliary winding of the first-phase transformer, and the same-name end of the primary-side auxiliary winding of the first-phase transformer is connected to the other end of the second switch module; The same-name end of the secondary main winding of the first-phase transformer is connected to one end of the first rectifier module, and the non-like-name end of the secondary main winding of the first-phase transformer is connected to the other end of the first rectifier module; the same-name end of the secondary main winding of the second-phase transformer is connected to one end of the second rectifier module, and the non-like-name end of the secondary main winding of the second-phase transformer is connected to the other end of the second rectifier module.

[0008] A further improvement of the technical solution of the present invention is that: the first switch module and the second switch module are both half-bridge switch modules composed of two switch tubes, and the half-bridge switch module includes a first switch tube and a second switch tube; the specific connection method is: The positive electrode of the DC power supply is connected to the first end of the first switch tube, the second end of the first switch tube is connected to one end of the resonant tank, and the second end of the first switch tube is also connected to the first end of the second switch tube; the negative electrode of the DC power supply is connected to the second end of the second switch tube, the second end of the second switch tube is grounded, and the second end of the second switch tube is also connected to the same-name end of the primary-side auxiliary winding of the first-phase transformer or the same-name end of the primary-side auxiliary winding of the second-phase transformer.

[0009] A further improvement of the technical solution of the present invention is that: the first switch module and the second switch module are both full-bridge switch modules composed of four switch tubes, and the full-bridge switch module includes a first switch tube, a second switch tube, a third switch tube and a fourth switch tube; the specific connection method is: The positive electrode of the DC power supply is connected to the first end of the first switch tube, the first end of the first switch tube is connected to the first end of the third switch tube, the second end of the first switch tube is connected to one end of the resonant tank, the second end of the third switch tube is connected to the same-name end of the primary-side auxiliary winding of the first phase transformer or the same-name end of the primary-side auxiliary winding of the second phase transformer, the second end of the first switch tube is also connected to the first end of the second switch tube, and the second end of the third switch tube is also connected to the first end of the fourth switch tube; the negative electrode of the DC power supply is connected to the second end of the second switch tube, and the second end of the second switch tube is connected to the second end of the fourth switch tube.

[0010] A further improvement of the technical solution of the present invention is that: when the first rectifier module and the second rectifier module both adopt full-wave rectifier modules composed of two diodes, the rectifier circuit realizes full-wave rectification; the full-wave rectifier module includes a first diode and a second diode; the specific connection method is: The same-name end of the secondary main winding of the transformer is connected to the positive electrode of the first diode, the negative electrode of the first diode is connected to the negative electrode of the second diode, the negative electrode of the second diode is connected to the filter circuit, the non-same-name end of the secondary main winding of the transformer is connected to the positive electrode of the second diode, and the center tap of the secondary main winding of the transformer is connected to the output negative electrode.

[0011] A further improvement of the technical solution of the present invention is that: when the first rectifier module and the second rectifier module both adopt a full-bridge rectifier module composed of four diodes, the rectifier circuit realizes full-bridge rectification; the full-bridge rectifier module includes a first diode, a second diode, a third diode and a fourth diode; the specific connection method is: The same-name end of the secondary main winding of the transformer is connected to the positive electrode of the first diode, the positive electrode of the first diode is connected to the negative electrode of the second diode, the negative electrode of the first diode is connected to the negative electrode of the third diode, the positive electrode of the third diode is connected to the negative electrode of the fourth diode, the negative electrode of the third diode is connected to the filter circuit, the non-same-name end of the secondary main winding of the transformer is connected to the negative electrode of the fourth diode, the positive electrode of the second diode is connected to the positive electrode of the fourth diode, and the positive electrode of the fourth diode is connected to the output negative electrode.

[0012] A further improvement of the technical solution of the present invention is that the DC power supply is a single DC power supply or a plurality of DC power supplies connected in series or a plurality of DC power supplies connected in parallel or a plurality of positive and negative DC power supplies.

[0013] A further improvement of the technical solution of the present invention is that the first switch module and the second switch module in the switch circuit adopt field effect transistors or insulated gate bipolar transistors.

[0014] A further improvement of the technical solution of the present invention is that the first rectifier module and the second rectifier module in the rectifier circuit adopt diodes or field effect transistors.

[0015] A further improvement of the technical solution of the present invention is that the external control adopts digital control.

[0016] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is: 1. The resonant converter provided by the present invention realizes the change of the rated voltage based on the relationship between the primary side main winding and the primary side auxiliary winding, that is, the resonant converter can change the rated output voltage as the ratio between the main winding and the auxiliary winding changes; based on the external controller controlling the square wave voltages generated by the two switch modules to be in phase or in reverse phase, the output voltage range of the resonant converter can be further expanded by frequency conversion.

[0017] 2. The present invention solves the problem that it is difficult for a resonant converter to achieve a wide range of output. While retaining the advantages of the resonant converter, it can be flexibly converted to the next mode by only adjusting the phase of the square wave voltage generated by the switch module of the second-phase transformer, thereby achieving the effect of flexibly adjusting the output range. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. Figure 1It is a circuit diagram of a half-bridge LLC resonant converter provided in the background technology of the present invention; Figure 2 It is a circuit diagram of a dual half-bridge LLC resonant converter provided in the background technology of the present invention; Figure 3 is a schematic structural diagram of a wide-range resonant converter with an auxiliary winding on the primary side provided in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the circuit structure of a wide-range resonant converter with an auxiliary winding on the primary side provided in Embodiment 1 of the present invention; Figure 5 This is a circuit diagram of a half-bridge switch module provided in Embodiment 1 of the present invention; Figure 6 This is a circuit diagram of a full-bridge switch module provided in Embodiment 2 of the present invention; Figure 7 This is a circuit diagram of a full-wave rectifier module provided in Embodiment 2 of the present invention; Figure 8 This is a circuit diagram of the full-bridge rectifier module provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0019] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or apparatus.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "several" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0022] The present invention is further described in detail below with reference to the accompanying drawings and embodiments: Example 1 To solve Figure 1 and Figure 2 The problem of narrow output voltage range of resonant converter is Figure 3 , 4 As shown, the present invention provides a wide-range resonant converter device with an auxiliary winding on the primary side, comprising a DC power supply, a switch circuit, a resonant circuit, a rectifier circuit and a filter circuit connected in sequence; the switch circuit receives an external control signal for control; the resonant circuit comprises a resonant tank and a transformer; the switch circuit comprises a first switch module and a second switch module arranged in parallel; the rectifier circuit comprises a first rectifier module and a second rectifier module arranged in parallel; the filter circuit is connected to an output load; the resonant tank comprises a first resonant tank and a second resonant tank; like Figure 4 As shown, the transformer includes a first-phase transformer T1 and a second-phase transformer T2, each phase transformer has a primary winding and a secondary winding, the primary winding based on the first-phase transformer T1 includes a primary main winding and a primary auxiliary winding; the primary winding based on the second-phase transformer T2 includes a primary main winding and a primary auxiliary winding; Specifically: the first switch module is connected to one end of the first resonant tank, the other end of the first resonant tank is connected to the same-name end of the primary main winding of the first phase transformer, the non-same-name end of the primary main winding of the first phase transformer is connected to the non-same-name end of the primary auxiliary winding of the second phase transformer, and the same-name end of the primary auxiliary winding of the second phase transformer is connected to the other end of the first switch module; the second switch module is connected to one end of the second resonant tank, the other end of the second resonant tank is connected to the same-name end of the primary main winding of the second phase transformer, the non-same-name end of the primary main winding of the second phase transformer is connected to the non-same-name end of the primary auxiliary winding of the first phase transformer, and the same-name end of the primary auxiliary winding of the first phase transformer is connected to the other end of the second switch module.

[0023] Based on the above resonant converter, it is assumed that the primary side main winding turns of the first phase transformer T1 and the second phase transformer T2 are both m, the primary side auxiliary winding turns of the first phase transformer T1 and the second phase transformer T2 are both n, the secondary side main winding turns of the first phase transformer T1 and the second phase transformer T2 are both 1, and the voltage corresponding to each winding turn is V w , the square wave voltages generated by the first switch module and the second switch module are controlled by an external controller to be in phase or in opposite phases. Without considering the influence of the input voltage, if the square wave voltages generated by the first switch module and the second switch module are in opposite phases, the effect of the auxiliary winding is to suppress the gain, and the output voltage of the resonant converter is 1 / (m+n)* Vw If the square wave voltages generated by the first switch module and the second switch module are in phase, the effect of the auxiliary winding is to promote gain, and the output voltage of the resonant converter is 1 / (mn)* V w , then the output resonant frequency of the resonant converter is [1 / (mn)* V w ] and [1 / (m+n)* V w ], the voltage at the output resonant frequency point can be changed by changing the ratio of the primary main winding to the primary auxiliary winding, and then a wide range of output can be achieved through frequency conversion control. By selecting a suitable ratio, compared with Figure 2 The resonant converter shown in FIG. 1 has a gain range of 0.8 to 1.2, and the present invention can achieve 0.8*[1 / (mn)* V w ] to 1.2*[1 / (m+n)* V w ] gain range. In simple terms, frequency conversion can be achieved to achieve a wide range of output through the configuration of the primary side main winding and the primary side auxiliary winding of the first phase transformer T1 and the second phase transformer T2 and the reasonable allocation of the resonance tank parameters. This has the advantages of a resonant converter and a wide gain range, which essentially solves the problem of a narrow output range.

[0024] like Figure 4 As shown, the same-name end of the secondary side main winding of the first-phase transformer T1 is connected to one end of the first rectifier module, and the non-same-name end of the secondary side main winding of the first-phase transformer T1 is connected to the other end of the first rectifier module; the same-name end of the secondary side main winding of the second-phase transformer T2 is connected to one end of the second rectifier module, and the non-same-name end of the secondary side main winding of the second-phase transformer T2 is connected to the other end of the second rectifier module.

[0025] Based on the fact that the primary side main winding, primary side auxiliary winding, and secondary side main winding of the first phase transformer T1 have the same turn ratio as the primary side main winding, primary side auxiliary winding, and secondary side main winding of the second phase transformer T2, respectively. Assume that the number of turns of the primary side main winding of the first phase transformer T1 and the second phase transformer T2 are both m, the number of turns of the primary side auxiliary winding of the first phase transformer T1 and the second phase transformer T2 are both n, the number of turns of the secondary side main winding of the first phase transformer T1 and the second phase transformer T2 are both k, and the voltage across the switch circuit is V w , the square wave voltages generated by the first switch module and the second switch module are controlled by an external controller to be in phase or in opposite phases. Without considering the influence of the input voltage, if the currents of the first switch module and the second switch module are in opposite phases, the effect of the auxiliary winding is to suppress the gain. The output voltage of the resonant converter is k / (m+n)* V wIf the square wave voltages generated by the first switch module and the second switch module are in phase, the effect of the auxiliary winding is to promote gain, and the output voltage of the resonant converter is k / (mn)* V w , then the output resonant frequency of the resonant converter is [k / (mn)* V w ] and [k / (m+n)* V w ], the voltage at the output resonant frequency point can be changed by changing the ratio of the primary main winding to the primary auxiliary winding, and then a wide range of output can be achieved through frequency conversion control. By selecting a suitable ratio, compared with Figure 2 The resonant converter shown has a gain range of 0.8 to 1.2. This scheme can achieve 0.8*[k / (mn)* V w ] to 1.2*[k / (m+n)* V w ] gain range, essentially solving the problem of narrow output range.

[0026] Specifically, a suitable ratio is selected. Assume that the primary side main winding turns of the first phase transformer T1 and the second phase transformer T2 are both 10, the primary side auxiliary winding turns of the first phase transformer T1 and the second phase transformer T2 are both 2, the secondary side main winding turns of the first phase transformer T1 and the second phase transformer T2 are both 15, and the voltage across the switch circuit is 200V, the currents of the first switch module and the second switch module in the switch circuit are in anti-phase, and the resonant converter outputs a voltage of 250V at the resonant frequency point; the square wave voltages generated by the first switch module and the second switch module are in phase, The resonant converter has an output voltage of 375V at the resonant frequency point. Through frequency conversion control, when the currents of the first switch module and the second switch module are in anti-phase, the output range is 200-300V, and when the square wave voltages generated by the first switch module and the second switch module are in phase, the output range is 300-450V. The total output range is 200-450V. Only the current relationship between the first switch module and the second switch module is adjusted. The purpose of wide-range output is achieved without changing the advantages of the resonant converter, which essentially solves the problem of narrow output range.

[0027] The DC power supply based on the resonant converter includes a single DC power supply or multiple series DC power supplies or multiple parallel DC power supplies or multiple positive and negative DC power supplies. It can be used according to different application scenarios. The circuit can be powered by different power supply methods with the same voltage, the same power supply method with different voltages, or multiple positive and negative voltage power supply methods, so that the resonant converter can be better used in the scenario of multi-way power supply.

[0028] Furthermore, external control can adopt digital control and other controls to perform more flexible modulation; the first switch module and the second switch module in the switching circuit can adopt field effect transistors, insulated gate bipolar transistors or other power electronic devices, and can also adopt devices of different materials, such as silicon, silicon carbide, gallium nitride, etc.; in addition to diodes, the first rectifier module and the second rectifier module in the rectifier circuit can also use field effect transistors to more accurately control the output voltage, so that the range of output voltage changes is more flexible and soft switching is more ideal.

[0029] Furthermore, in the present embodiment, the first switch module and the second switch module are both half-bridge switch modules, which have a simple structure, low cost, are suitable for a medium power range, and have a simple driving circuit.

[0030] According to the above, the resonant circuit includes a first resonant tank and a second resonant tank; each resonant tank includes a resonant inductor, a resonant capacitor and an excitation inductor; the first switch module is connected to the same-name end of the primary side main winding of the first phase transformer T1 through the resonant capacitor and the resonant inductor of the first resonant tank, the non-same-name end of the primary side main winding of the first phase transformer T1 is connected to the non-same-name end of the primary side auxiliary winding of the second phase transformer T2, the same-name end of the primary side auxiliary winding of the second phase transformer T2 is connected to the other end of the first switch module, and the first phase transformer T1 The excitation inductance of the first resonant tank is connected between the two ends of the primary main winding; the second switch module is connected to the same-name end of the primary main winding of the second phase transformer T2 via the resonant capacitor and the resonant inductance of the second resonant tank, the non-same-name end of the primary main winding of the second phase transformer T2 is connected to the non-same-name end of the primary auxiliary winding of the first phase transformer T1, the same-name end of the primary auxiliary winding of the first phase transformer T1 is connected to the other end of the second switch module, and the excitation inductance of the second resonant tank is connected between the two ends of the primary main winding of the second phase transformer T2; or The first switch module is connected to the same-name end of the primary-side main winding of the first-phase transformer T1, the non-same-name end of the primary-side main winding of the first-phase transformer T1 is connected to the non-same-name end of the primary-side auxiliary winding of the second-phase transformer T2, the same-name end of the primary-side auxiliary winding of the second-phase transformer T2 is connected to the other end of the first switch module via the resonant capacitor and resonant inductor of the first resonant tank, and the excitation inductor of the first resonant tank is connected between the two ends of the primary-side main winding of the first-phase transformer T1; The second switch module is connected to the same-name end of the primary main winding of the second phase transformer T2, the non-same-name end of the primary main winding of the second phase transformer T2 is connected to the non-same-name end of the primary auxiliary winding of the first phase transformer T1, the same-name end of the primary auxiliary winding of the first phase transformer T1 is connected to the other end of the second switch module via the resonant capacitor and resonant inductor of the second resonant tank, and the excitation inductor of the second resonant tank is connected between the two ends of the primary main winding of the second phase transformer T2.

[0031] The resonant tank can reduce the loss caused by turning on and off the switch tubes of the first switch module and the second switch module, thereby increasing the efficiency of the resonant converter.

[0032] According to the above, the half-bridge switch circuit includes two groups of half-bridge switch modules, such as Figure 5 As shown, a half-bridge switch module has two switch tubes controlled by a controller, namely, a first switch tube Q1 and a second switch tube Q2. One end of the first switch tube Q1 located at the upper end is connected to the positive electrode of the DC power supply, and the other end of the first switch tube Q1 is connected to one end of the second switch tube Q2 located at the lower end. A resonant tank is connected between the first switch tube Q1 and the second switch tube Q2. The other end of the second switch tube Q2 is connected to the negative electrode of the DC power supply, the other end of the second switch tube Q2 is connected to the ground, and the other end of the second switch tube Q2 is connected to the non-same-name end of the transformer.

[0033] Specifically: the positive electrode of the DC power supply is connected to the first end of the first switch tube Q1, the second end of the first switch tube Q1 is connected to one end of the resonant tank, and the second end of the first switch tube Q1 is also connected to the first end of the second switch tube Q2; the negative electrode of the DC power supply is connected to the second end of the second switch tube Q2, the second end of the second switch tube Q2 is grounded, and the second end of the second switch tube Q2 is also connected to the same-name end of the primary-side auxiliary winding of the first-phase transformer or the same-name end of the primary-side auxiliary winding of the second-phase transformer.

[0034] The external control in this example adopts digital control, the first switch module and the second switch module in the switch circuit adopt field effect transistors made of silicon, and the first rectifier module and the second rectifier module in the rectifier circuit adopt diodes.

[0035] Example 2 The difference between this embodiment and embodiment 1 lies in the difference between the first switch module and the second switch module. This embodiment uses a full-bridge switch module, while embodiment 1 uses a half-bridge switch module. This embodiment is more suitable for larger power occasions than embodiment 1.

[0036] like Figure 6As shown, a full-bridge switch module has four switch tubes controlled by a controller, including a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, and a fourth switch tube Q4; one end of the first switch tube Q1 and the third switch tube Q3 are both connected to the positive electrode of the DC power supply, the other end of the first switch tube Q1 is connected to one end of the second switch tube Q2, a resonance module is connected between the first switch tube Q1 and the second switch tube Q2, the other end of the third switch tube Q3 is connected to one end of the fourth switch tube Q4, the third switch tube Q3 and the fourth switch tube Q4 are connected to the non-same-name end of the transformer, the other ends of the second switch tube Q2 and the fourth switch tube Q4 are connected to the negative electrode of the DC power supply, and the other ends of the second switch tube Q2 and the fourth switch tube Q4 are connected to the ground.

[0037] Specifically, the positive electrode of the DC power supply is connected to the first end of the first switch tube Q1, the first end of the first switch tube Q1 is connected to the first end of the third switch tube Q3, the second end of the first switch tube Q1 is connected to one end of the resonant tank, the second end of the third switch tube Q3 is connected to the same-name end of the primary-side auxiliary winding of the first-phase transformer or the same-name end of the primary-side auxiliary winding of the second-phase transformer, the second end of the first switch tube Q1 is also connected to the first end of the second switch tube Q2, and the second end of the third switch tube Q3 is also connected to the first end of the fourth switch tube Q4; the negative electrode of the DC power supply is connected to the second end of the second switch tube Q2, and the second end of the second switch tube Q2 is connected to the second end of the fourth switch tube Q4.

[0038] The external control in this example adopts digital control, the first switch module and the second switch module in the switch circuit adopt field effect transistors made of silicon, and the first rectifier module and the second rectifier module in the rectifier circuit adopt diodes.

[0039] like Figure 7 As shown, when the first rectifier module and the second rectifier module both adopt full-wave rectifier modules composed of two diodes, the rectifier circuit can realize full-wave rectification; the full-wave rectifier module includes a first diode D1 and a second diode D2; the specific connection method is: The same-name end of the secondary main winding of the transformer is connected to the positive electrode of the first diode D1, the negative electrode of the first diode D1 is connected to the negative electrode of the second diode D2, the negative electrode of the second diode D2 is connected to the filter circuit, the non-same-name end of the secondary main winding of the transformer is connected to the positive electrode of the second diode D2, and the center tap of the secondary main winding of the transformer is connected to the output negative electrode.

[0040] like Figure 8 As shown, when the first rectifier module and the second rectifier module both adopt a full-bridge rectifier module composed of four diodes, the rectifier circuit can realize full-bridge rectification; the full-bridge rectifier module includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4; the specific connection method is: The same-name end of the secondary main winding of the transformer is connected to the anode of the first diode D1, the anode of the first diode D1 is connected to the cathode of the second diode D2, the cathode of the first diode D1 is connected to the cathode of the third diode D3, the anode of the third diode D3 is connected to the cathode of the fourth diode D4, the cathode of the third diode D3 is connected to the filter circuit, the non-same-name end of the secondary main winding of the transformer is connected to the cathode of the fourth diode D4, the anode of the second diode D2 is connected to the anode of the fourth diode D4, and the anode of the fourth diode D4 is connected to the output cathode.

[0041] Furthermore, for rectification, the withstand voltage requirement of each device in the full-bridge rectification is lower than that of the full-wave rectification, so the full-bridge rectification can be used; when the output voltage is required to be low, a half-bridge switching module can be used. For rectification, both full-bridge rectification and full-wave rectification are possible.

[0042] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. Similar parts between the various embodiments can be referenced to each other.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wide-range resonant converter device with an auxiliary winding on the primary side, comprising a DC power supply, a switching circuit, a resonant circuit, a rectifier circuit and a filter circuit connected in sequence, characterized in that: The switch circuit includes a first switch module and a second switch module connected in parallel; the resonant circuit includes a resonant tank and a transformer, and the resonant tank includes a first resonant tank and a second resonant tank; the transformer includes a first phase transformer and a second phase transformer; the rectifier circuit includes a first rectifier module and a second rectifier module connected in parallel; the filter circuit is connected to the output load; The switch circuit receives control of an external control signal, and has two modes: the square wave voltages generated by the first switch module and the second switch module are in phase, or the square wave voltages generated by the first switch module and the second switch module are in opposite phases; The primary windings of the first phase transformer and the second phase transformer both include a primary main winding and a primary auxiliary winding; the first switch module is connected to the primary auxiliary winding of the second phase transformer, and the second switch module is connected to the primary auxiliary winding of the first phase transformer.

2. A wide range resonant converter device with an auxiliary winding on the primary side according to claim 1, characterized in that: The specific connection method of the resonant converter device is as follows: the first switch module is connected to one end of the first resonant slot, the other end of the first resonant slot is connected to the same-name end of the primary main winding of the first phase transformer, the non-same-name end of the primary main winding of the first phase transformer is connected to the non-same-name end of the primary auxiliary winding of the second phase transformer, and the same-name end of the primary auxiliary winding of the second phase transformer is connected to the other end of the first switch module; the second switch module is connected to one end of the second resonant slot, the other end of the second resonant slot is connected to the same-name end of the primary main winding of the second phase transformer, the non-same-name end of the primary main winding of the second phase transformer is connected to the non-same-name end of the primary auxiliary winding of the first phase transformer, and the same-name end of the primary auxiliary winding of the first phase transformer is connected to the other end of the second switch module; The same-name end of the secondary main winding of the first-phase transformer is connected to one end of the first rectifier module, and the non-same-name end of the secondary main winding of the first-phase transformer is connected to the other end of the first rectifier module; The same-name end of the secondary main winding of the second phase transformer is connected to one end of the second rectifier module, and the non-same-name end of the secondary main winding of the second phase transformer is connected to the other end of the second rectifier module.

3. A wide-range resonant converter device with an auxiliary winding on the primary side according to any one of claims 1-2, characterized in that: The first switch module and the second switch module are both half-bridge switch modules composed of two switch tubes, and the half-bridge switch module includes a first switch tube and a second switch tube; the specific connection method is: The positive electrode of the DC power supply is connected to the first end of the first switch tube, the second end of the first switch tube is connected to one end of the resonant tank, and the second end of the first switch tube is also connected to the first end of the second switch tube; the negative electrode of the DC power supply is connected to the second end of the second switch tube, the second end of the second switch tube is grounded, and the second end of the second switch tube is also connected to the same-name end of the primary-side auxiliary winding of the first-phase transformer or the same-name end of the primary-side auxiliary winding of the second-phase transformer.

4. A wide range resonant converter device with an auxiliary winding on the primary side according to any one of claims 1-2, characterized in that: The first switch module and the second switch module are both full-bridge switch modules composed of four switch tubes, and the full-bridge switch module includes a first switch tube, a second switch tube, a third switch tube and a fourth switch tube; the specific connection method is: The positive electrode of the DC power supply is connected to the first end of the first switch tube, the first end of the first switch tube is connected to the first end of the third switch tube, the second end of the first switch tube is connected to one end of the resonant tank, the second end of the third switch tube is connected to the same-name end of the primary-side auxiliary winding of the first phase transformer or the same-name end of the primary-side auxiliary winding of the second phase transformer, the second end of the first switch tube is also connected to the first end of the second switch tube, and the second end of the third switch tube is also connected to the first end of the fourth switch tube; the negative electrode of the DC power supply is connected to the second end of the second switch tube, and the second end of the second switch tube is connected to the second end of the fourth switch tube.

5. A wide-range resonant converter device with an auxiliary winding on the primary side according to any one of claims 1-2, characterized in that: When both the first rectifier module and the second rectifier module adopt full-wave rectifier modules composed of two diodes, the rectifier circuit realizes full-wave rectification; the full-wave rectifier module includes a first diode and a second diode; the specific connection method is: The same-name end of the secondary main winding of the transformer is connected to the positive electrode of the first diode, the negative electrode of the first diode is connected to the negative electrode of the second diode, the negative electrode of the second diode is connected to the filter circuit, the non-same-name end of the secondary main winding of the transformer is connected to the positive electrode of the second diode, and the center tap of the secondary main winding of the transformer is connected to the output negative electrode.

6. A wide range resonant converter device with an auxiliary winding on the primary side according to any one of claims 1-2, characterized in that: When the first rectifier module and the second rectifier module both use a full-bridge rectifier module composed of four diodes, the rectifier circuit realizes full-bridge rectification; the full-bridge rectifier module includes a first diode, a second diode, a third diode and a fourth diode; the specific connection method is: The same-name end of the secondary main winding of the transformer is connected to the positive electrode of the first diode, the positive electrode of the first diode is connected to the negative electrode of the second diode, the negative electrode of the first diode is connected to the negative electrode of the third diode, the positive electrode of the third diode is connected to the negative electrode of the fourth diode, the negative electrode of the third diode is connected to the filter circuit, the non-same-name end of the secondary main winding of the transformer is connected to the negative electrode of the fourth diode, the positive electrode of the second diode is connected to the positive electrode of the fourth diode, and the positive electrode of the fourth diode is connected to the output negative electrode.

7. A wide range resonant converter device with an auxiliary winding on the primary side according to claim 1, characterized in that: The DC power supply is a single DC power supply or a plurality of DC power supplies connected in series or a plurality of DC power supplies connected in parallel or a plurality of positive and negative DC power supplies.

8. A wide range resonant converter device with an auxiliary winding on the primary side according to claim 1, characterized in that: The first switch module and the second switch module in the switch circuit are field effect transistors or insulated gate bipolar transistors.

9. A wide range resonant converter device with an auxiliary winding on the primary side according to claim 1, characterized in that: The first rectifier module and the second rectifier module in the rectifier circuit are diodes or field effect transistors.

10. A wide range resonant converter device with an auxiliary winding on the primary side according to claim 1, characterized in that: External control adopts digital control.

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