Wide-range DCDC conversion circuit
By setting two switching units and a single-pole double-throw switch in the DC-DC converter circuit, the series or parallel output of the transformer module windings is realized, which solves the problems of multiple components and complex control in the existing technology and improves the circuit efficiency.
Patent Information
- Application Number
- CN202520281683.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-21
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2035-02-21
AI Technical Summary
Existing DC-DC converter circuits require the control of three switching switches, resulting in high cost, low efficiency, and complex control processes, making them particularly unsuitable for low-power switching power supplies.
The system employs a transformer module, a primary input module, a first secondary output module, a second secondary output module, and a switching module. By setting two switching units between the first and second secondary windings of the transformer module, the system enables the series or parallel output of the first and second secondary windings of the transformer module, and uses a single-pole double-throw switch for switching.
The number of components was reduced, the control process was simplified, and the circuit's operating efficiency was improved.
Smart Images
Figure CN223713866U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of rectifier circuits, and more specifically, to a wide-range DC-DC converter circuit. Background Technology
[0002] To accommodate a wider range of loads, a wide output voltage range is becoming an increasingly urgent requirement for switching power supply modules. In the charging pile industry, to enable charging of vehicles with different models and battery voltage specifications, the output voltage requirement for charging modules is generally 150V to 1000V. Furthermore, due to increasingly fierce market competition and decreasing cost requirements, the design of the DC-DC conversion circuit for charging modules presents significant challenges. Commonly used DC-DC conversion circuits for charging modules are as follows: Figure 1 As shown, its output module includes three switching switches S1 to S3. When the DC-DC converter circuit operates in series mode, switching switch S1 is closed and switching switches S2 to S3 are open. When the DC-DC converter circuit operates in parallel mode, switching switch S1 is open and switching switches S2 to S3 are closed. However, such a design requires controlling at least three switching switches, resulting in high cost, low efficiency, and a relatively complex control process, making it particularly unsuitable for low-power switching power supplies. Utility Model Content
[0003] The technical problem to be solved by this invention is to address the shortcomings of existing DC-DC converter circuits, which require at least three switching switches to control, resulting in high cost, low efficiency, and relatively complex control processes. This invention provides a wide-range DC-DC converter circuit that uses fewer components, has a simpler control process, and therefore has higher overall circuit efficiency.
[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: A wide-range DC-DC converter circuit is constructed, including a transformer module, a primary input module, a first secondary output module, a second secondary output module, and a switching module. The switching module consists of a first switching unit and a second switching unit. The first end of the first secondary winding of the transformer module is connected to the first end of the first secondary output module, and the second end is connected to the first end of the first switching unit. The first end of the second secondary winding of the transformer module is connected to the first end of the second switching unit, and the second end is connected to the first end of the second secondary output module. The second end of the first switching unit is connected to the second end of the first secondary output module, the second end of the second secondary output module, and the second end of the second switching unit. The third end of the first switching unit is connected to the third end of the second secondary output module. The third end of the second switching unit is connected to the third end of the first secondary output module.
[0005] The utility model provides a wide range DCDC conversion circuit, including first switching unit, second switching unit, first vice side output module and second vice side output module, first switching unit and second switching unit are connected, first vice side output module and second vice side output module are connected.
[0006] The utility model provides a wide range DCDC conversion circuit, including first switching unit, second switching unit, first vice side output module and second vice side output module, first switching unit and second switching unit are connected, first vice side output module and second vice side output module are connected,
[0007] The utility model provides a wide range DCDC conversion circuit, including first switching unit, second switching unit, first vice side output module and second vice side output module, first switching unit and second switching unit are connected, first vice side output module and second vice side output module are connected,
[0008] The utility model provides a wide range DCDC conversion circuit, including first switching unit, second switching unit, first vice side output module and second vice side output module, first switching unit and second switching unit are connected, first vice side output module and second vice side output module are connected,
[0009] The utility model provides a wide range DCDC conversion circuit, including first switching unit, second switching unit, first vice side output module and second vice side output module, first switching unit and second switching unit are connected, first vice side output module and second vice side output module are connected,
[0010] The utility model provides a wide range DCDC conversion circuit, including first switching unit, second switching unit, first vice side output module and second vice side output module, first switching unit and second switching unit are connected, first vice side output module and second vice side output module are connected,
[0011] The utility model provides a wide range DCDC conversion circuit, including first switching unit, second switching unit, first vice side output module and second vice side output module, first switching unit and second switching unit are connected, first vice side output module and second vice side output module are connected,
[0012] The anode of the first rectifier diode is connected with the first end of the first secondary winding of the transformer module, the cathode is connected with the third end of the second switching unit and the first end of the first output capacitor; the second end of the first output capacitor is connected with the first end of the second output capacitor, the second end of the first switching unit and the second end of the second switching unit;
[0013] The anode of the second rectifier diode is connected with the second end of the second secondary winding of the transformer module, the cathode is connected with the second end of the second output capacitor and the third end of the first switching unit.
[0014] The first secondary output module comprises a first rectifier switch tube and a first output capacitor; the second secondary output module comprises a second rectifier switch tube and a second output capacitor;
[0015] The control end of the first rectifier switch tube and the second rectifier switch tube receives a control signal; the second end of the first rectifier switch tube is connected with the first end of the first secondary winding of the transformer module, the first end is connected with the third end of the second switching unit and the first end of the first output capacitor; the second end of the first output capacitor is connected with the first end of the second output capacitor, the second end of the first switching unit and the second end of the second switching unit;
[0016] The second end of the second rectifier switch tube is connected with the second end of the second secondary winding of the transformer module, the first end is connected with the second end of the second output capacitor and the third end of the first switching unit.
[0017] The first secondary output module comprises a first rectifier diode, a third rectifier diode, a first secondary inductor and a first output capacitor; the second secondary output module comprises a second rectifier diode, a fourth rectifier diode, a second secondary inductor and a second output capacitor;
[0018] The anode of the first rectifier diode is connected with the first end of the first secondary winding of the transformer module, the cathode is connected with the third end of the second switching unit, the first end of the first secondary inductor and the cathode of the third rectifier diode, the second end of the first secondary inductor is connected with the first end of the first output capacitor; the second end of the first output capacitor is connected with the first end of the second output capacitor, the second end of the first switching unit and the second end of the second switching unit; the anode of the third rectifier diode is connected with the first end of the first switching unit;
[0019] The anode of the second rectifier diode is connected with the second end of the second secondary side winding of the transformer module, the cathode is connected with the third end of the first switching unit, the first end of the second secondary side inductor and the cathode of the fourth rectifier diode, and the second end of the second secondary side inductor is connected with the second end of the second output capacitor; the anode of the fourth rectifier diode is connected with the first end of the second switching unit.
[0020] In the wide-range DCDC conversion circuit, the primary side input module comprises a switching tube full-bridge unit and an LC unit.
[0021] The first input end and the second input end of the switching tube full-bridge unit are respectively connected with the first end and the second end of the input voltage, the first output end of the switching tube full-bridge unit is connected with the first end of the primary side winding of the transformer module through the LC unit, and the second output end of the switching tube full-bridge unit is connected with the second end of the primary side winding of the transformer module.
[0022] In the wide-range DCDC conversion circuit, the primary side input module comprises a switching tube half-bridge unit, a first input capacitor, a second input capacitor and an LC unit.
[0023] The first input end and the second input end of the switching tube half-bridge unit are respectively connected with the first end and the second end of the input voltage, the output end of the switching tube half-bridge unit is connected with the first end of the primary side winding of the transformer module through the LC unit, the first end of the first input capacitor is connected with the first end of the input voltage, the second end of the first input capacitor is connected with the first end of the second input capacitor and the second end of the primary side winding of the transformer module, and the second end of the second input capacitor is connected with the second end of the input voltage.
[0024] The wide-range DCDC conversion circuit of the utility model only needs to set two switching units between the first secondary side winding and the second secondary side winding of the transformer module, so that the series connection or parallel connection output of the first secondary side winding and the second secondary side winding of the transformer module can be realized, and then the wide-range output of voltage is realized, so that compared with the prior art, the utility model uses less devices, the control process is simpler, and the working efficiency of the whole circuit is higher. BRIEF DESCRIPTION OF DRAWINGS
[0025] The utility model will be further described below in combination with the drawings and examples, and the drawings are as follows:
[0026] Figure 1 It is the circuit diagram of the DCDC conversion circuit of the prior art;
[0027] Figure 2 It is the principle block diagram of the preferred embodiment of the wide-range DCDC conversion circuit of the utility model;
[0028] Figure 3 is a circuit diagram of a preferred embodiment of the wide-range DCDC conversion circuit of the utility model;
[0029] Figure 4 is a connection relation schematic diagram of a preferred embodiment of the switching unit of the wide-range DCDC conversion circuit of the utility model;
[0030] Figure 5 is another connection relation schematic diagram of a preferred embodiment of the switching unit of the wide-range DCDC conversion circuit of the utility model;
[0031] Figure 6 is another connection relation schematic diagram of a preferred embodiment of the switching unit of the wide-range DCDC conversion circuit of the utility model;
[0032] Figure 7 is shown Figure 3 is the secondary side equivalent circuit of the wide-range DCDC conversion circuit in the first state shown;
[0033] Figure 8 is shown Figure 3 is the secondary side equivalent circuit of the wide-range DCDC conversion circuit in the second state shown;
[0034] Figure 9 is a circuit diagram of another preferred embodiment of the wide-range DCDC conversion circuit of the utility model;
[0035] Figure 10 is a circuit diagram of another preferred embodiment of the wide-range DCDC conversion circuit of the utility model;
[0036] Figure 11 is a circuit diagram of another preferred embodiment of the wide-range DCDC conversion circuit of the utility model;
[0037] Figure 12 is a circuit diagram of another preferred embodiment of the wide-range DCDC conversion circuit of the utility model. DETAILED DESCRIPTION
[0038] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the utility model is further described in detail below by combining with the drawings and examples. It should be understood that the specific examples described here are only used to explain the utility model, and are not used to limit the utility model.
[0039] Figure 2 is a principle block diagram of a preferred embodiment of the wide-range DCDC conversion circuit of the utility model. As Figure 2As shown, the wide-range DCDC conversion circuit of the utility model, including transformer module 200, primary side input module 100, first secondary side output module 410, second secondary side output module 420 and switching module. In the preferred embodiment of the utility model, the transformer module 200 can adopt one or more transformer configurations, as long as it has the first secondary side winding and the second secondary side winding. The primary side input module 100 can adopt any known module, circuit configuration, for example, it can be full-bridge, half-bridge LLC input module, full-bridge or phase-shift full-bridge rectifier input module, etc., which all fall within the protection scope of the utility model. Similarly, the first secondary side output module 410 and the second secondary side output module 420 can also adopt known module, circuit configuration, for example, it can be full-bridge, half-bridge LLC output module, full-bridge or phase-shift full-bridge rectifier output module, etc. The utility model is preferably suitable for low-power modules. It should be noted that various implementation modes of each transformer module 200, primary side input module 100, first secondary side output module 410, second secondary side output module 420 and switching module in the utility model can be combined at will.
[0040] Further as shown in Figure 2 The switching module is composed of a first switching unit 310 and a second switching unit 320; the first end of the first secondary side winding N2 of the transformer module 200 is connected to the first end of the first secondary side output module 410, and the second end is connected to the first end of the first switching unit 310; the first end of the second secondary side winding N3 of the transformer module 200 is connected to the first end of the second switching unit 320, and the second end is connected to the first end of the second secondary side output module 420; the second end of the first switching unit 310 is connected to the second end of the first secondary side output module 410, the second end of the second secondary side output module 420 and the second end of the second switching unit 320, and the third end of the first switching unit 310 is connected to the third end of the second secondary side output module 420; the third end of the second switching unit 320 is connected to the third end of the first secondary side output module 410.
[0041] The wide-range DCDC conversion circuit of the utility model only needs to set two switching units between the first secondary side winding and the second secondary side winding of the transformer module, so as to realize the series or parallel output of the first secondary side winding and the second secondary side winding of the transformer module, and further realize the wide-range output of voltage, so compared with the prior art, it uses fewer devices, the control process is simpler, and the working efficiency of the whole circuit is higher.
[0042] Figure 3 is the circuit diagram of the preferred embodiment of the wide-range DCDC conversion circuit of the utility model. Combined with Figures 2-3It can be known that the wide-range DCDC conversion circuit comprises a transformer module 200, a primary side input module 100, a first secondary side output module 410, a second secondary side output module 420 and a switching module. Figure 3 As shown in the figure, the transformer module 200 comprises a transformer T, and the transformer T comprises a primary side winding N1, a first secondary side winding N2 and a second secondary side winding N3.
[0043] In a preferred embodiment of the utility model, as shown in the figure, Figure 4 The first switching unit 310 and the second switching unit 320 can comprise a single-pole double-throw switch respectively, the moving contact end of the single-pole double-throw switch is connected with the first end A of the corresponding switching unit, the first stationary contact is connected with the second end B of the corresponding switching unit, and the second stationary contact is connected with the third end C of the corresponding switching unit.
[0044] In a preferred embodiment of the utility model, as shown in the figure, Figure 5 The first switching unit 310 and the second switching unit 320 can comprise two single-pole single-throw switches respectively, that is, the first switching unit 310 and the second switching unit 320 comprise a first single-pole single-throw switch K1 and a second single-pole single-throw switch K2 respectively, as shown in the figure, Figure 5 The moving contact end of the first single-pole single-throw switch K1 and the second single-pole single-throw switch K2 is connected with the first end A of the switching unit, the stationary contact of the first single-pole single-throw switch K1 is connected with the second end B of the switching unit, and the stationary contact of the second single-pole single-throw switch K2 is connected with the third end C of the switching unit.
[0045] In a preferred embodiment of the utility model, as shown in the figure, Figure 6As shown, the first switching unit 310 and the second switching unit 320 can respectively include four switching transistors, for example, switching transistor Q11, switching transistor Q12, switching transistor Q13 and switching transistor Q14; the control end of the switching transistor Q11, the control end of the switching transistor Q12, the control end of the switching transistor Q13 and the control end of the switching transistor Q14 respectively receive a control signal; the first end of the switching transistor Q11 and the first end of the switching transistor Q13 are connected to the first end A of the switching unit, the second end of the switching transistor Q11 is connected to the second end of the switching transistor Q12, the first end of the switching transistor Q12 is connected to the second end B of the switching unit, the second end of the switching transistor Q13 is connected to the second end of the switching transistor Q14, and the first end of the switching transistor Q14 is connected to the third end C of the switching unit. In a preferred embodiment of the present application, the switching transistor Q11, the switching transistor Q12, the switching transistor Q13 and the switching transistor Q14 respectively include a triode, a MOS tube or an IGBT tube.
[0046] In Figure 3 In the preferred embodiment shown, the primary side of the wide-range DCDC conversion circuit is a full-bridge LLC structure, that is, the primary side input module 100 includes a switching transistor full-bridge unit and an LC unit, and in the preferred embodiment, the LC unit is an LC resonance unit. As shown in Figure 3 The switching transistor full-bridge unit is composed of switching transistors Q1-Q4, and the LC resonance unit is composed of inductor Lr and capacitor Cr. The first input end and the second input end of the switching transistor full-bridge unit are respectively connected to the first end and the second end of the input voltage Vin, the first output end of the switching transistor full-bridge unit is connected to the first end of the primary side winding N1 of the transformer module 200 through the LC resonance unit, and the second output end of the switching transistor full-bridge unit is connected to the second end of the primary side winding N1 of the transformer module 200.
[0047] In Figure 3 In the preferred embodiment shown, the first switching unit 310 includes a single-pole double-throw switch S1, and the second switching unit 320 respectively includes a single-pole double-throw switch S2. The first secondary side output module 410 includes a rectifier diode D1 and an output capacitor C1; the second secondary side output module 420 includes a rectifier diode D2 and an output capacitor C2. As shown in Figure 3As shown, the anode of the rectifier diode D1 is connected to the first end of the first secondary winding N2 of the transformer module 200, and the cathode is connected to the second stationary contact of the single-pole double-throw switch S2 and the first end of the output capacitor C1; the second end of the output capacitor C1 is connected to the first end of the output capacitor C2, the first stationary contact of the single-pole double-throw switch S1 and the first stationary contact of the single-pole double-throw switch S2; the anode of the rectifier diode D2 is connected to the second end of the second secondary winding N3 of the transformer module 200, and the cathode is connected to the second end of the output capacitor C2 and the second stationary contact of the single-pole double-throw switch S1.
[0048] Figure 7 It shows Figure 3 The secondary-side equivalent circuit of the wide-range DC-DC converter circuit in the first state is shown. Figure 8 It shows Figure 3 The equivalent circuit of the secondary side in the second state of the wide-range DC-DC converter circuit is shown below. Figures 7-8 right Figure 3 The principle of the wide-range DC-DC converter circuit shown is explained below. For example... Figure 7 As shown, when the moving contact of the single-pole double-throw switch S1 is connected to the first stationary contact, and the moving contact of the single-pole double-throw switch S2 is also connected to the first stationary contact, the first secondary winding N2 and the second secondary winding N3 of the transformer T are connected in series for output. That is, the first secondary winding N2, the rectifier diode D1, and the output capacitor C1 form the first rectifier circuit; the second secondary winding N3, the rectifier diode D2, and the output capacitor C2 form the second rectifier circuit. The two rectifier circuits work alternately and output in series. This is the high-voltage operating mode, and the circuit can output a higher voltage. Figure 8 As shown, when the moving contact of the single-pole double-throw switch S1 is connected to the second stationary contact, and the moving contact of the single-pole double-throw switch S2 is also connected to the second stationary contact, the first secondary winding N2 and the second secondary winding N3 of the transformer T are connected in parallel for output; that is, the first secondary winding N2, the rectifier diode D1, and the output capacitors C1 to C2 form the first rectifier circuit; the second secondary winding N3, the rectifier diode D2, and the output capacitors C1 to C2 form the second rectifier circuit. The two rectifier circuits work alternately and output in parallel, which is the low-voltage operating mode, and the circuit can output a lower voltage. By switching between the above two operating states, a wide voltage range output of the switching power supply can be achieved. Only two single-pole double-throw switches are used, which requires fewer components, and the moving contacts of the single-pole double-throw switches S1 to S2 are connected to the first or second stationary contact for switching, simplifying the control process. Compared with the existing DC-DC conversion circuits, which require controlling at least three switching switches, this invention uses fewer components, has a simpler control process, and therefore has higher efficiency. Of course, in other preferred embodiments of this utility model, the following methods can be used: Figures 5-6The different switching units in the process operate on similar principles, and will not be elaborated upon here.
[0049] Figure 9 This is a circuit diagram of another preferred embodiment of the wide-range DC-DC converter circuit of this utility model. In fact, Figure 9 The preferred embodiments shown are Figure 3 The illustrated embodiment is similar, except that rectifier switches Q5 and Q6 are used instead of rectifier diodes D1 and D2 to form a secondary-side synchronous rectification or bidirectional LLC wide-range DC-DC converter circuit. The following only describes... Figure 9 and Figure 3 Explain the differences. For example... Figure 9 As shown, the first secondary-side output module 410 includes a rectifier switch Q5 and an output capacitor C1; the second secondary-side output module 420 includes a rectifier switch Q6 and an output capacitor C2. Figure 9 In the preferred embodiment shown, the rectifier switch Q5 and the rectifier switch Q6 are MOSFETs, whose gates receive control signals; the drain of the rectifier switch Q5 is connected to the first terminal of the first secondary winding N2 of the transformer module 200, and the source is connected to the second stationary contact of the single-pole double-throw switch S2 and the first terminal of the output capacitor C1; the second terminal of the output capacitor C1 is connected to the first terminal of the output capacitor C2, the first stationary contact of the single-pole double-throw switch S1, and the first stationary contact of the single-pole double-throw switch S2; the drain of the rectifier switch Q6 is connected to the second terminal of the second secondary winding N3 of the transformer module 200, and the source is connected to the second terminal of the output capacitor C2 and the second stationary contact of the single-pole double-throw switch S1.
[0050] In another preferred embodiment of this utility model, the rectifier switch Q5 and the rectifier switch Q6 can also be transistors or IGBTs, etc. These all fall within the protection scope of this utility model.
[0051] Figure 9 The principle of the wide-range DC-DC converter circuit shown is... Figure 3 Similarly, its primary input module 100 and switching unit can also be constructed using any of the embodiments disclosed throughout this application, which will not be repeated here.
[0052] Figure 10 This is a circuit diagram of another preferred embodiment of the wide-range DC-DC converter circuit of this utility model. In fact, Figure 10 The preferred embodiments shown are Figure 3 The illustrated embodiment is similar, except that it is a hard-switched full-bridge or phase-shifted full-bridge wide-range DC-DC converter circuit.
[0053] exist Figure 10In the preferred embodiment shown, the primary-side input module 100 includes a full-bridge switching unit and an LC unit. For example... Figure 3 As shown, the full-bridge switching unit is composed of switching transistors Q1 to Q4, and the LC unit is composed of an inductor Lr and a capacitor Cr. The first and second input terminals of the full-bridge switching unit are respectively connected to the first and second terminals of the input voltage Vin. The first output terminal of the full-bridge switching unit is connected to the first terminal of the primary winding N1 of the transformer module 200 via the LC unit, and the second output terminal of the full-bridge switching unit is connected to the second terminal of the primary winding N1 of the transformer module 200. Figure 10 In the preferred embodiment shown, the inductor Lr is a series inductor and the capacitor Cr is a DC blocking capacitor.
[0054] exist Figure 10 In the preferred embodiment shown, the first secondary-side output module 410 includes rectifier diodes D1 and D3, a secondary-side inductor L1, and an output capacitor C1; the second secondary-side output module 420 includes rectifier diodes D2 and D4, a secondary-side inductor L2, and an output capacitor C2. Figure 10 As shown, the anode of rectifier diode D1 is connected to the first end of the first secondary winding N2 of transformer module 200, the cathode is connected to the second stationary contact of single-pole double-throw switch S2, the first end of secondary inductor L1, and the cathode of rectifier diode D3; the second end of secondary inductor L1 is connected to the first end of output capacitor C1; the second end of output capacitor C1 is connected to the first end of output capacitor C2, the first stationary contact of single-pole double-throw switch S1, and the first stationary contact of single-pole double-throw switch S2; the anode of rectifier diode D3 is connected to the moving contact of single-pole double-throw switch S1; the anode of rectifier diode D2 is connected to the second end of the second secondary winding N3 of transformer module 200, the cathode is connected to the second stationary contact of single-pole double-throw switch S1, the first end of secondary inductor L2, and the cathode of rectifier diode D4; the second end of secondary inductor L2 is connected to the second end of output capacitor C2; the anode of rectifier diode D4 is connected to the moving contact of single-pole double-throw switch S2.
[0055] Similarly, Figure 10 The principle of the wide-range DC-DC converter circuit shown is... Figure 3 Similarly, its switching unit can also be constructed using any of the embodiments disclosed throughout this application, which will not be repeated here.
[0056] Figure 11 This is a circuit diagram of another preferred embodiment of the wide-range DC-DC converter circuit of this utility model. Figure 12 This is a circuit diagram of another preferred embodiment of the wide-range DC-DC converter circuit of this utility model.Figures 11-12 The preferred embodiments shown are respectively similar to Figure 3 and 9 The difference is only that, Figures 11-12 The embodiment shown is a half-bridge unidirectional and secondary side synchronous rectification or bidirectional LLC circuit; the primary side input module 100 includes a switch tube half-bridge unit, an input capacitor C3, an input capacitor C4 and an LC unit.
[0057] As shown in Figure 11 The switch tube half-bridge unit is composed of switch tubes Q1-Q2, and the LC unit is an LC resonance unit composed of an inductor Lr and a capacitor Cr. The first input end and the second input end of the switch tube half-bridge unit are respectively connected to the first end and the second end of the input voltage Vin, and the output end of the switch tube half-bridge unit is connected to the first end of the primary winding N1 of the transformer module 200 through the LC unit; the first end of the input capacitor C3 is connected to the first end of the input voltage Vin, the second end of the input capacitor C3 is connected to the first end of the input capacitor C4 and the second end of the primary winding N1 of the transformer module 200, and the second end of the input capacitor C4 is connected to the second end of the input voltage Vin.
[0058] Similarly, Figures 11-12 The principle of the wide-range DCDC conversion circuit shown is similar to Figure 3 And the first secondary side output module and the second secondary side output module 410, i.e. the switching unit, can also be constructed by any of the embodiments disclosed in the full text of the present application, and will not be repeated here.
[0059] The wide-range DCDC conversion circuit of the utility model only uses two single-pole double-throw switches, uses few devices, and the moving contact of the single-pole double-throw switch S1-S2 is connected to the first or second stationary contact at the same time, and the control process is simple. Compared with the DCDC conversion circuit of the prior art which needs to control at least three switching switches for switching, the utility model uses fewer devices and the control process is simpler, so the efficiency is higher.
[0060] Although the utility model is described through specific embodiments, those skilled in the art should understand that various transformations and equivalent substitutions of the utility model can be made without departing from the scope of the utility model. In addition, various modifications can be made to the utility model for specific situations or materials without departing from the scope of the utility model. Therefore, the utility model is not limited to the specific embodiments disclosed, but should include all the embodiments falling within the scope of the claims of the utility model.
[0061] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A wide-range DC-DC conversion circuit comprising a transformer module, a primary input module, a first secondary output module, a second secondary output module, and a switching module, characterized by, The switching module is composed of a first switching unit and a second switching unit; a first end of the first secondary winding of the transformer module is connected to a first end of the first secondary output module, and a second end is connected to a first end of the first switching unit; a first end of the second secondary winding of the transformer module is connected to a first end of the second switching unit, and a second end is connected to a first end of the second secondary output module; a second end of the first secondary output module, a second end of the second secondary output module and a second end of the second switching unit are connected to a second end of the first switching unit; a third end of the first switching unit is connected to a third end of the second secondary output module; a third end of the second switching unit is connected to a third end of the first secondary output module.
2. The wide-range DC-DC conversion circuit according to claim 1, characterized by, The first switching unit comprises a single-pole double-throw switch; the second switching unit comprises a single-pole double-throw switch; a moving contact end of the single-pole double-throw switch is connected to a first end of the switching unit, a first static contact is connected to a second end of the switching unit, and a second static contact is connected to a third end of the switching unit.
3. The wide-range DC-DC conversion circuit according to claim 1, characterized by, The first switching unit comprises a first single-pole single-throw switch and a second single-pole single-throw switch; the second switching unit comprises a first single-pole single-throw switch and a second single-pole single-throw switch; A moving contact end of the first single-pole single-throw switch and the second single-pole single-throw switch is connected to a first end of the switching unit, a static contact of the first single-pole single-throw switch is connected to a second end of the switching unit, and a static contact of the second single-pole single-throw switch is connected to a third end of the switching unit.
4. The wide-range DC-DC conversion circuit according to claim 1, characterized by, The first switching unit comprises a first switching transistor, a second switching transistor, a third switching transistor and a fourth switching transistor, and the second switching unit comprises a first switching transistor, a second switching transistor, a third switching transistor and a fourth switching transistor; Control ends of the first switching transistor, the second switching transistor, the third switching transistor and the fourth switching transistor respectively receive control signals; a first end of the first switching transistor and the third switching transistor is connected to a first end of the switching unit, a second end of the first switching transistor is connected to a second end of the second switching transistor, a first end of the second switching transistor is connected to a second end of the switching unit, a second end of the third switching transistor is connected to a second end of the fourth switching transistor, and a first end of the fourth switching transistor is connected to a third end of the switching unit.
5. The wide-range DC-DC conversion circuit according to claim 4, characterized by, The first switching transistor, the second switching transistor, the third switching transistor and the fourth switching transistor respectively comprise a triode, a MOS tube or an IGBT tube.
6. The wide-range DC-DC conversion circuit according to any one of claims 1 to 5, characterized by, The first secondary output module comprises a first rectifier diode and a first output capacitor; the second secondary output module comprises a second rectifier diode and a second output capacitor; An anode of the first rectifier diode is connected to a first end of the first secondary winding of the transformer module, a cathode is connected to a third end of the second switching unit, and a first end of the first output capacitor; a second end of the first output capacitor is connected to a first end of the second output capacitor, a second end of the first switching unit and a second end of the second switching unit; An anode of the second rectifier diode is connected to a second end of a second secondary winding of the transformer module, a cathode is connected to a second end of the second output capacitor and a third end of the first switching unit.
7. The wide-range DC-DC conversion circuit according to any one of claims 1 to 5, characterized by, The first secondary output module comprises a first rectifier switch tube and a first output capacitor, and the second secondary output module comprises a second rectifier switch tube and a second output capacitor. Control ends of the first rectifier switch tube and the second rectifier switch tube receive a control signal, a second end of the first rectifier switch tube is connected to a first end of a first secondary winding of the transformer module, a first end is connected to a third end of the second switching unit and a first end of the first output capacitor, and a second end of the first output capacitor is connected to a first end of the second output capacitor, a second end of the first switching unit and a second end of the second switching unit. A second end of the second rectifier switch tube is connected to a second end of a second secondary winding of the transformer module, and a first end is connected to a second end of the second output capacitor and a third end of the first switching unit.
8. The wide-range DC-DC conversion circuit according to any one of claims 1 to 5, characterized by, The first secondary output module comprises a first rectifier diode, a third rectifier diode, a first secondary inductor and a first output capacitor, and the second secondary output module comprises a second rectifier diode, a fourth rectifier diode, a second secondary inductor and a second output capacitor. An anode of the first rectifier diode is connected to a first end of a first secondary winding of the transformer module, a cathode is connected to a third end of the second switching unit, a first end of the first secondary inductor and a cathode of the third rectifier diode, a second end of the first secondary inductor is connected to a first end of the first output capacitor, a second end of the first output capacitor is connected to a first end of the second output capacitor, a second end of the first switching unit and a second end of the second switching unit, and an anode of the third rectifier diode is connected to a first end of the first switching unit. An anode of the second rectifier diode is connected to a second end of a second secondary winding of the transformer module, a cathode is connected to a third end of the first switching unit, a first end of the second secondary inductor and a cathode of the fourth rectifier diode, a second end of the second secondary inductor is connected to a second end of the second output capacitor, and an anode of the fourth rectifier diode is connected to a first end of the second switching unit.
9. The wide-range DC-DC conversion circuit according to any one of claims 1 to 5, characterized by, The primary input module comprises a switch tube full-bridge unit and an LC unit. First and second input ends of the switch tube full-bridge unit are connected to first and second ends of an input voltage respectively, a first output end of the switch tube full-bridge unit is connected to a first end of a primary winding of the transformer module through the LC unit, and a second output end of the switch tube full-bridge unit is connected to a second end of the primary winding of the transformer module.
10. The wide-range DC-DC conversion circuit according to any one of claims 1 to 5, characterized by, The primary input module comprises a switch tube half-bridge unit, a first input capacitor, a second input capacitor and an LC unit. The first input end and the second input end of the switch tube half-bridge unit are connected with the first end and the second end of the input voltage respectively, the output end of the switch tube half-bridge unit is connected with the first end of the primary winding of the transformer module through the LC unit; the first end of the first input capacitor is connected with the first end of the input voltage, the second end of the first input capacitor is connected with the first end of the second input capacitor and the second end of the primary winding of the transformer module, and the second end of the second input capacitor is connected with the second end of the input voltage.