Wide range resonant converter arrangement with auxiliary winding on primary side

Abstract

The application discloses a wide-range resonant converter device with primary side auxiliary winding, and belongs to the technical field of power electronics. The device comprises a DC power supply, a switching circuit, a resonant circuit, a rectifier circuit and a filter circuit which are connected in sequence. The switching circuit comprises two switching modules which are connected in parallel. The resonant circuit comprises two resonant tanks and two-phase transformers. The rectifier circuit comprises two rectifier modules which are connected in parallel. The filter circuit is connected with an output load. The switching circuit receives an external control signal for control, and has two modes: the square wave voltages generated by the two switching modules are in phase, or the square wave voltages generated by the two switching modules are in opposite phase. The primary side windings of the two-phase transformers each comprise a primary side main winding and a primary side auxiliary winding. The first switching module is connected with the primary side auxiliary winding of the second-phase transformer, and the second switching module is connected with the primary side auxiliary winding of the first-phase transformer. The application solves the problem that it is difficult for a resonant converter to realize wide-range output, and can flexibly adjust the output range.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power electronics, and particularly to a wide-range resonant converter device with an auxiliary winding on the primary side. BACKGROUND

[0002] Resonant converters can be classified into series resonant converters, parallel resonant converters and series-parallel resonant converters according to the connection mode of resonant elements. Resonant converters are widely used because of their simple structure, high efficiency, high power density, soft switching of switching devices, and thus significantly reduced switching loss and improved efficiency.

[0003] Although resonant converters have many advantages, the output range of resonant converters is limited, and the output voltage can only be adjusted in a small range. For example, as shown in FIG. 1, the most basic series-parallel resonant converter, a half-bridge LLC resonant converter, uses frequency modulation control to adjust the gain and thus 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 times to 0.8 times the rated voltage, so 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. Figure 1 To solve the problem of narrow output range, as shown in FIG. 2, two half-bridge converters are connected in series on the secondary side,

[0004] Figure 2 Figure 1 The output rated voltage of the resonant converter becomes Figure 2 twice that of the converter, and the output rated voltage is 2Vo. The output adjustment range also becomes Figure 1 twice that of the converter, 2.4*Vo-1.6*Vo. Although the interval of the output voltage has become larger, the increase in the rated voltage will change the application scenario, and the problem of narrow output range has not been fundamentally solved. Figure 1 SUMMARY

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

[0006] To solve the above technical problems, the technical scheme adopted by the present application is:

[0007] ​​​The application discloses a wide-range resonant converter device with an auxiliary winding on the primary side, which comprises a DC power supply, a switching circuit, a resonant circuit, a rectifier circuit and a filter circuit connected in sequence, wherein the switching circuit comprises first and second switching modules connected in parallel; the resonant circuit comprises first and second resonant tanks and a transformer; the transformer comprises first and second phase transformers; the rectifier circuit comprises first and second rectifier modules connected in parallel; and the filter circuit is connected to an output load.

[0008] The switching circuit receives an external control signal and has two modes: the square wave voltages generated by the first and second switching modules are in phase, or the square wave voltages generated by the first and second switching modules are in opposite phase.

[0009] The primary side winding of the first phase transformer and the primary side winding of the second phase transformer each comprise a primary side main winding and a primary side auxiliary winding; the first switching module is connected to the primary side auxiliary winding of the second phase transformer, and the second switching module is connected to the primary side auxiliary winding of the first phase transformer.

[0010] The application further improves the technical scheme as follows: the first switching module is connected to one end of the first resonant tank, the other end of the first resonant tank is connected to the same-named end of the primary side main winding of the first phase transformer, the non-same-named end of the primary side main winding of the first phase transformer is connected to the non-same-named end of the primary side auxiliary winding of the second phase transformer, the same-named end of the primary side auxiliary winding of the second phase transformer is connected to the other end of the first switching module; the second switching module is connected to one end of the second resonant tank, the other end of the second resonant tank is connected to the same-named end of the primary side main winding of the second phase transformer, the non-same-named end of the primary side main winding of the second phase transformer is connected to the non-same-named end of the primary side auxiliary winding of the first phase transformer, and the same-named end of the primary side auxiliary winding of the first phase transformer is connected to the other end of the second switching module.

[0011] The same-named end of the primary side main winding of the first phase transformer is connected to one end of the first rectifier module, and the non-same-named end of the primary side main winding of the first phase transformer is connected to the other end of the first rectifier module; the same-named end of the primary side main winding of the second phase transformer is connected to one end of the second rectifier module, and the non-same-named end of the primary side main winding of the second phase transformer is connected to the other end of the second rectifier module.

[0012] Further improvement of the technical scheme of the present application is that the first switch module and the second switch module are both half-bridge switch modules composed of two switch tubes, the half-bridge switch module comprises a first switch tube and a second switch tube; and the specific connection mode is that:

[0013] The positive pole of the direct current power supply is connected to the first end of the first switch tube, one end of the resonant tank is connected to the second end of the first switch tube, and the first end of the second switch tube is also connected to the second end of the first switch tube; the negative pole of the direct current 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-named end of the primary side auxiliary winding of the first phase transformer or the same-named end of the primary side auxiliary winding of the second phase transformer.

[0014] Further improvement of the technical scheme of the present application is that the first switch module and the second switch module are both full-bridge switch modules composed of four switch tubes, the full-bridge switch module comprises a first switch tube, a second switch tube, a third switch tube and a fourth switch tube; and the specific connection mode is that:

[0015] The positive pole of the direct current 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, one end of the resonant tank is connected to the second end of the first switch tube, the second end of the third switch tube is connected to the same-named end of the primary side auxiliary winding of the first phase transformer or the same-named 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 pole of the direct current 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.

[0016] Further improvement of the technical scheme of the present application is that when the first rectifier module and the second rectifier module are both full-wave rectifier modules composed of two diodes, the rectifier circuit realizes full-wave rectification; the full-wave rectifier module comprises a first diode and a second diode; and the specific connection mode is that:

[0017] The same-named end of the secondary side main winding of the transformer is connected to the positive pole of the first diode, the negative pole of the first diode is connected to the negative pole of the second diode, the negative pole of the second diode is connected to the filter circuit, the non-same-named end of the secondary side main winding of the transformer is connected to the positive pole of the second diode, and the center tap of the secondary side main winding of the transformer is connected to the negative pole of the output.

[0018] Further improvement of the technical scheme of the present application is that when the first rectifying module and the second rectifying module are both full-bridge rectifying modules composed of four diodes, the rectifying circuit realizes full-bridge rectification; the full-bridge rectifying module comprises a first diode, a second diode, a third diode and a fourth diode; and the specific connection mode is as follows:

[0019] The same name end of the primary 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 primary 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 negative electrode of the output.

[0020] Further improvement of the technical scheme of the present application is that the direct current power supply is a single direct current power supply, a plurality of series direct current power supplies, a plurality of parallel direct current power supplies or a plurality of positive and negative direct current power supplies.

[0021] Further improvement of the technical scheme of the present application is that the first switch module and the second switch module in the switch circuit adopt field effect transistors or insulated gate bipolar transistors.

[0022] Further improvement of the technical scheme of the present application is that the first rectifying module and the second rectifying module in the rectifying circuit adopt diodes or field effect transistors.

[0023] Further improvement of the technical scheme of the present application is that external control adopts digital control.

[0024] Thanks to the above technical scheme, the present application has the following technical progress:

[0025] 1. The resonant converter provided by the present application realizes the change of rated voltage based on the relationship between the primary winding and the auxiliary winding, that is, the resonant converter can change the size of the rated output voltage along with the ratio between the primary winding and the auxiliary winding; the phase of the square wave voltage generated by the two switch modules is controlled by the external controller to be in phase or out of phase, so that the output voltage range of the resonant converter can be further expanded by frequency conversion.

[0026] 2. The present application solves the problem of difficulty in realizing wide-range output of the resonant converter, while retaining the advantages of the resonant converter, and by adjusting only the phase of the square wave voltage generated by the second switch module, the output range can be flexibly converted to the next mode, achieving the effect of flexible adjustment of the output range. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0028] Figure 1 is a circuit schematic diagram of the half-bridge LLC resonant converter provided in the background art of the present application;

[0029] Figure 2 is a circuit schematic diagram of the double half-bridge LLC resonant converter provided in the background art of the present application;

[0030] Figure 3 is a structural schematic diagram of the wide-range resonant converter with an auxiliary winding on the primary side provided in Embodiment 1 of the present application;

[0031] Figure 4 is a circuit structural schematic diagram of the wide-range resonant converter with an auxiliary winding on the primary side provided in Embodiment 1 of the present application;

[0032] Figure 5 is a circuit schematic diagram of the half-bridge switching module provided in Embodiment 1 of the present application;

[0033] Figure 6 is a circuit schematic diagram of the full-bridge switching module provided in Embodiment 2 of the present application;

[0034] Figure 7 is a circuit schematic diagram of the full-wave rectification module provided in Embodiment 2 of the present application;

[0035] Figure 8 is a circuit schematic diagram of the full-bridge rectification module provided in Embodiment 2 of the present application. DETAILED DESCRIPTION

[0036] It should be noted that the terms “include” and “have” and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover the non-exclusive inclusion, for example, the processes, methods, systems, products or devices containing a series of steps or units do not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0038] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "several" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] The present application will be further described in detail below in conjunction with the drawings and examples:

[0040] Example 1

[0041] In order to solve Figure 1 and Figure 2 the problem of narrow output voltage range of the resonant converter, as shown in Figure 3 , 4 The present application provides a wide-range resonant converter device with 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; the switching circuit receives an external control signal for control; the resonant circuit comprises a resonant tank and a transformer; the switching circuit comprises a first switching module and a second switching 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;

[0042] As shown in Figure 4 , the transformer comprises a first-phase transformer T1 and a second-phase transformer T2, each phase transformer has a primary side winding and a secondary side winding, and the primary side winding based on the first-phase transformer T1 comprises a primary side main winding and a primary side auxiliary winding; the primary side winding based on the second-phase transformer T2 comprises a primary side main winding and a primary side auxiliary winding;

[0043] 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 end of the primary main winding of the first phase transformer, the non-same end of the primary main winding of the first phase transformer is connected to the non-same end of the primary auxiliary winding of the second phase transformer, and the same 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 end of the primary main winding of the second phase transformer, the non-same end of the primary main winding of the second phase transformer is connected to the non-same end of the primary auxiliary winding of the first phase transformer, and the same end of the primary auxiliary winding of the first phase transformer is connected to the other end of the second switch module.

[0044] Based on the above resonant converter, assuming that the number of turns of the primary main winding of the first phase transformer T1 and the second phase transformer T2 is m, the number of turns of the primary auxiliary winding of the first phase transformer T1 and the second phase transformer T2 is n, the number of turns of the secondary main winding of the first phase transformer T1 and the second phase transformer T2 is 1, and the voltage corresponding to each turn of winding is V w , by controlling the phase of the square wave voltage generated by the first switch module and the second switch module or the reverse phase of the square wave voltage generated by the first switch module and the second switch module through an external controller, without considering the influence of the input voltage, if the square wave voltage generated by the first switch module and the second switch module is in reverse phase, the effect of the auxiliary winding is to suppress the gain, and the output voltage of the resonant converter is 1 / (m+n)* V w ; if the square wave voltage generated by the first switch module and the second switch module is in phase, the effect of the auxiliary winding is to promote the gain, and the output voltage of the resonant converter is 1 / (m-n)* V w , then the output resonant frequency point of the resonant converter is [1 / (m-n)* V w ] and [1 / (m+n)* V w ], the voltage size of the output resonant frequency point can be changed by changing the ratio of the primary main winding and the primary auxiliary winding, and a wide range of output can be achieved by frequency conversion control. By selecting a suitable ratio, compared with the resonant converter shown in Figure 2 , the gain range is 0.8 to 1.2, and the gain range of the present application is 0.8*[1 / (m-n)* V w ] to 1.2*[1 / (m+n)* V w ]. Simply put, by configuring the primary main winding and the primary auxiliary winding of the first phase transformer T1 and the second phase transformer T2 and reasonably distributing the resonant tank parameters, frequency conversion to wide range output can be achieved, which not only has the advantages of resonant converters, but also has a wide gain range, i.e. essentially solves the problem of narrow output range.

[0045] AsFigure 4 As shown, the same-name terminal of the secondary main winding of the first phase transformer T1 is connected to one end of the first rectifier module, and the non-same-name terminal of the secondary main winding of the first phase transformer T1 is connected to the other end of the first rectifier module; the same-name terminal of the secondary main winding of the second phase transformer T2 is connected to one end of the second rectifier module, and the non-same-name terminal of the secondary main winding of the second phase transformer T2 is connected to the other end of the second rectifier module.

[0046] The turns ratios of the primary main winding, primary auxiliary winding, and secondary main winding of the first-phase transformer T1 are the same as those of the primary main winding, primary auxiliary winding, and secondary main winding of the second-phase transformer T2. Assume that the number of turns in the primary main windings of both the first-phase transformer T1 and the second-phase transformer T2 is m, the number of turns in the primary auxiliary windings of both the first-phase transformer T1 and the second-phase transformer T2 is n, the number of turns in the secondary main windings of both the first-phase transformer T1 and the second-phase transformer T2 is k, and the voltage across the switching circuit is V. w The square wave voltages generated by the first and second switching modules are controlled by an external controller to be either in phase or out of phase. Without considering the influence of the input voltage, if the currents of the first and second switching modules are out of phase, the auxiliary winding suppresses gain. The output voltage of this resonant converter is k / (m+n)*V. w If the square wave voltages generated by the first and second switching modules are in phase, then the auxiliary winding will increase the gain, and the output voltage of the resonant converter will be 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 can be changed by altering the ratio of the primary winding to the auxiliary winding. A wide output range can then be achieved through frequency conversion control. Selecting an appropriate ratio allows for comparison with... Figure 2 The resonant converter shown has a gain range of 0.8 to 1.2. This scheme can achieve a gain of 0.8 * [k / (mn) * V]. w ] to 1.2*[k / (m+n)* V w The gain range of ] essentially solves the problem of narrow output range.

[0047] Specifically, by selecting appropriate ratios, assuming 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 switching circuit is 200V, the current of the first switching module and the second switching module in the switching circuit is anti-phase, the output voltage of the resonant converter at the resonant frequency point is 250V; the square wave voltage generated by the first switching module and the second switching module is in-phase, the output voltage of the resonant converter at the resonant frequency point is 375V, through frequency control, in the case that the current of the first switching module and the second switching module is anti-phase, the output range is 200-300V, and in the case that the square wave voltage generated by the first switching module and the second switching module is in-phase, the output range is 300-450V, the total output range is 200-450V, by adjusting only the relationship between the current of the first switching module and the second switching module, the purpose of wide range output is achieved without changing the advantages of the resonant converter, and the problem of narrow output range is solved in essence.

[0048] The direct current power supply based on the resonant converter includes a single direct current power supply or multiple series direct current power supplies or multiple parallel direct current power supplies or multiple positive and negative direct current power supplies, and is used according to different application scenarios, so that the resonant converter can be better applied in the scenario of multiple power supply.

[0049] Further, the external control can adopt digital control and other controls to better perform flexible modulation; the first switching module and the second switching module in the switching circuit can adopt field effect transistors, insulated gate bipolar transistors or other power electronic devices, and can also adopt devices made of different materials, such as silicon, silicon carbide and gallium nitride; in addition to using diodes, the first rectifying module and the second rectifying module in the rectifying circuit can also use field effect transistors to more accurately control the output voltage, so that the range of the output voltage is more flexible and the soft switching is more ideal.

[0050] Further, the first switching module and the second switching module in the embodiment are both half-bridge switching modules, the half-bridge switching module has simple structure and low cost, is suitable for medium power range, and has simple driving circuit.

[0051] According to the above, the resonant circuit comprises a first resonant tank and a second resonant tank; each resonant tank comprises a resonant inductor, a resonant capacitor and an excitation inductor; the first switch module is connected to the same-named end of the primary main winding of the first phase transformer T1 via the resonant capacitor and the resonant inductor of the first resonant tank, the non-same-named end of the primary main winding of the first phase transformer T1 is connected to the non-same-named end of the primary auxiliary winding of the second phase transformer T2, the same-named end of the primary auxiliary winding of the second phase transformer T2 is connected to the other end of the first switch module, and the excitation inductor of the first resonant tank is connected between the two ends of the primary main winding of the first phase transformer T1; the second switch module is connected to the same-named end of the primary main winding of the second phase transformer T2 via the resonant capacitor and the resonant inductor of the second resonant tank, the non-same-named end of the primary main winding of the second phase transformer T2 is connected to the non-same-named end of the primary auxiliary winding of the first phase transformer T1, the same-named 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 inductor of the second resonant tank is connected between the two ends of the primary main winding of the second phase transformer T2; or

[0052] The first switch module is connected to the same-named end of the primary main winding of the first phase transformer T1, the non-same-named end of the primary main winding of the first phase transformer T1 is connected to the non-same-named end of the primary auxiliary winding of the second phase transformer T2, the same-named end of the primary auxiliary winding of the second phase transformer T2 is connected to the other end of the first switch module via the resonant capacitor and the 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 main winding of the first phase transformer T1.

[0053] The second switch module is connected to the same-named end of the primary main winding of the second phase transformer T2, the non-same-named end of the primary main winding of the second phase transformer T2 is connected to the non-same-named end of the primary auxiliary winding of the first phase transformer T1, the same-named 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 the 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.

[0054] The resonant tank can reduce the loss generated by the turn-on and turn-off of the switching tubes of the first switch module and the second switch module, and the efficiency of the resonant converter is improved.

[0055] According to the above, the half-bridge switching circuit comprises two groups of half-bridge switch modules, such as Figure 5As shown, a half-bridge switch module has two switching transistors controlled by a controller: a first switching transistor Q1 and a second switching transistor Q2. One end of the first switching transistor Q1, located at the upper end, is connected to the positive terminal of the DC power supply, and the other end of the first switching transistor Q1 is connected to one end of the second switching transistor Q2, located at the lower end. A resonant slot is connected between the first switching transistor Q1 and the second switching transistor Q2. The other end of the second switching transistor Q2 is connected to the negative terminal of the DC power supply, grounded, and connected to the non-identical terminal of the transformer.

[0056] Specifically: the positive terminal of the DC power supply is connected to the first terminal of the first switching transistor Q1, the second terminal of the first switching transistor Q1 is connected to one end of the resonant slot, and the second terminal of the first switching transistor Q1 is also connected to the first terminal of the second switching transistor Q2; the negative terminal of the DC power supply is connected to the second terminal of the second switching transistor Q2, the second terminal of the second switching transistor Q2 is grounded, and the second terminal of the second switching transistor Q2 is also connected to the same terminal of the primary auxiliary winding of the first phase transformer or the same terminal of the primary auxiliary winding of the second phase transformer.

[0057] In this example, the external control is digital control. The first and second switching modules in the switching circuit are silicon field-effect transistors, and the first and second rectifier modules in the rectifier circuit are diodes.

[0058] Example 2

[0059] 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 higher power applications than Embodiment 1.

[0060] like Figure 6 As shown, a full-bridge switching module has four switching transistors controlled by a controller, including a first switching transistor Q1, a second switching transistor Q2, a third switching transistor Q3, and a fourth switching transistor Q4. One end of the first switching transistor Q1 and the third switching transistor Q3 are connected to the positive terminal of the DC power supply. The other end of the first switching transistor Q1 is connected to one end of the second switching transistor Q2. A resonant module is connected between the first switching transistor Q1 and the second switching transistor Q2. The other end of the third switching transistor Q3 is connected to one end of the fourth switching transistor Q4. The non-same-name terminals of the transformer are connected between the third switching transistor Q3 and the fourth switching transistor Q4. The other ends of the second switching transistor Q2 and the fourth switching transistor Q4 are connected to the negative terminal of the DC power supply and grounded.

[0061] Specifically, the positive pole of the direct current 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 resonance tank, the second end of the third switch tube Q3 is connected to the same-named end of the primary side auxiliary winding of the first phase transformer or the same-named 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 pole of the direct current 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.

[0062] In the example, the external control is digital control, the first switch module and the second switch module in the switch circuit are made of silicon field effect transistors, and the first rectifier module and the second rectifier module in the rectifier circuit are diodes.

[0063] As shown in Figure 7 , when the first rectifier module and the second rectifier module are both 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 mode is as follows:

[0064] The same-named end of the secondary side main winding of the transformer is connected to the positive pole of the first diode D1, the negative pole of the first diode D1 is connected to the negative pole of the second diode D2, the negative pole of the second diode D2 is connected to the filter circuit, the non-same-named end of the secondary side main winding of the transformer is connected to the positive pole of the second diode D2, and the center tap of the secondary side main winding of the transformer is connected to the negative pole of the output.

[0065] As shown in Figure 8 , when the first rectifier module and the second rectifier module are both 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 mode is as follows:

[0066] The same-named end of the secondary side main winding of the transformer is connected to the positive pole of the first diode D1, the positive pole of the first diode D1 is connected to the negative pole of the second diode D2, the negative pole of the first diode D1 is connected to the negative pole of the third diode D3, the positive pole of the third diode D3 is connected to the negative pole of the fourth diode D4, the negative pole of the third diode D3 is connected to the filter circuit, the non-same-named end of the secondary side main winding of the transformer is connected to the negative pole of the fourth diode D4, the positive pole of the second diode D2 is connected to the positive pole of the fourth diode D4, and the positive pole of the fourth diode D4 is connected to the negative pole of the output.

[0067] Further, for rectification, the voltage resistance requirement of each device in full-bridge rectification is lower than that in full-wave rectification, so full-bridge rectification can be used; when low output voltage is required, a half-bridge switching module can be used, and for rectification, both full-bridge rectification and full-wave rectification are acceptable.

[0068] The various embodiments are described in a progressive manner in the specification, each embodiment focusing on the differences from other embodiments, and the similar parts between various embodiments can be referred to each other.

[0069] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

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 comprises a first switch module and a second switch module arranged in parallel; the resonance circuit comprises a resonance tank and a transformer, the resonance tank comprises a first resonance tank and a second resonance 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 primary side winding of the first-phase transformer and the primary side winding of the second-phase transformer each comprise a primary side main winding and a primary side auxiliary winding; the first switch module is connected to the primary side auxiliary winding of the second-phase transformer, and the second switch module is connected to the primary side auxiliary winding of the first-phase transformer; The first switch module is connected to one end of the first resonance tank, the other end of the first resonance tank is connected to the same-named end of the primary side main winding of the first-phase transformer, the non-same-named end of the primary side main winding of the first-phase transformer is connected to the non-same-named end of the primary side auxiliary winding of the second-phase transformer, and the same-named 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 resonance tank, the other end of the second resonance tank is connected to the same-named end of the primary side main winding of the second-phase transformer, the non-same-named end of the primary side main winding of the second-phase transformer is connected to the non-same-named end of the primary side auxiliary winding of the first-phase transformer, and the same-named 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-named end of the secondary side main winding of the first-phase transformer is connected to one end of the first rectifier module, and the non-same-named end of the secondary side main winding of the first-phase transformer is connected to the other end of the first rectifier module; the same-named end of the secondary side main winding of the second-phase transformer is connected to one end of the second rectifier module, and the non-same-named end of the secondary side main winding of the second-phase transformer is connected to the other end of the second rectifier module; The switch circuit receives external control signals for control, and has two working 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 opposite; by switching the two working modes, the output voltage can be adjusted in a wide range between k / (m-n)*Vw and k / (m+n)*Vw, wherein k is the number of turns of the secondary side main winding, m is the number of turns of the primary side main winding, n is the number of turns of the primary side auxiliary winding, and Vw is the voltage corresponding to each turn of winding.

2. A wide-range resonant converter apparatus with an auxiliary winding on the primary side according to claim 1, characterized in that: The first switch module and the second switch module are each a half-bridge switch module composed of two switch tubes, the half-bridge switch module comprises a first switch tube and a second switch tube; and the specific connection mode is as follows: The positive pole of the direct current power supply is connected to the first end of the first switch tube, one end of the resonant tank is connected to the second end of the first switch tube, and the first end of the second switch tube is also connected to the second end of the first switch tube; the negative pole of the direct current 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 end of the auxiliary winding of the primary side of the first phase transformer or the same end of the auxiliary winding of the primary side of the second phase transformer.

3. A wide-range resonant converter apparatus with an auxiliary winding on the primary side according to claim 1, 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 comprises a first switch tube, a second switch tube, a third switch tube and a fourth switch tube; the specific connection mode is as follows: The positive pole of the direct current 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, one end of the resonant tank is connected to the second end of the first switch tube, the second end of the third switch tube is connected to the same end of the auxiliary winding of the primary side of the first phase transformer or the same end of the auxiliary winding of the primary side 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 pole of the direct current 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.

4. A wide-range resonant converter apparatus with an auxiliary winding on the primary side according to claim 1, characterized in that: When the first rectifying module and the second rectifying module are both full-wave rectifying modules composed of two diodes, the rectifying circuit realizes full-wave rectification; the full-wave rectifying module comprises a first diode and a second diode; the specific connection mode is as follows: The same end of the main winding of the secondary side of the transformer is connected to the positive pole of the first diode, the negative pole of the first diode is connected to the negative pole of the second diode, the negative pole of the second diode is connected to the filter circuit, the non-same end of the main winding of the secondary side of the transformer is connected to the positive pole of the second diode, and the center tap of the main winding of the secondary side of the transformer is connected to the negative pole of the output.

5. A wide-range resonant converter apparatus with an auxiliary winding on the primary side according to claim 1, characterized in that: When the first rectifying module and the second rectifying module are both full-bridge rectifying modules composed of four diodes, the rectifying circuit realizes full-bridge rectification; the full-bridge rectifying module comprises a first diode, a second diode, a third diode and a fourth diode; the specific connection mode is as follows: The same end of the main winding of the secondary side of the transformer is connected to the positive pole of the first diode, the positive pole of the first diode is connected to the negative pole of the second diode, the negative pole of the first diode is connected to the negative pole of the third diode, the positive pole of the third diode is connected to the negative pole of the fourth diode, the negative pole of the third diode is connected to the filter circuit, the non-same end of the main winding of the secondary side of the transformer is connected to the negative pole of the fourth diode, the positive pole of the second diode is connected to the positive pole of the fourth diode, and the positive pole of the fourth diode is connected to the negative pole of the output.

6. A wide-range resonant converter apparatus with an auxiliary winding on the primary side as defined in claim 1, characterized in that: The direct current power supply is a single direct current power supply, a plurality of series direct current power supplies, a plurality of parallel direct current power supplies or a plurality of positive and negative direct current power supplies.

7. A wide-range resonant converter apparatus with an auxiliary winding on the primary side as defined in claim 1, characterized in that: The first switch module and the second switch module in the switch circuit adopt field effect transistors or insulated gate bipolar transistors.

8. A wide-range resonant converter apparatus with an auxiliary winding on the primary side as defined in claim 1, characterized by: The first rectifier module and the second rectifier module in the rectifier circuit adopt diodes or field effect transistors.

9. A wide-range resonant converter apparatus with an auxiliary winding on the primary side as defined in claim 1, characterized in that: The external control adopts digital control.

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