Multi-output module voltage doubling circuit

Abstract

The invention discloses a multi-output-module voltage doubling circuit, which belongs to the technical field of electric energy conversion, and comprises a plurality of switches, the output negative ends of a first output module to an (N-1) th output module are respectively connected with a first switch in series, and the output positive ends of a second output module to an Nth output module are respectively connected with a second switch in series. A third switch is connected between the first end of the first switch of the (n-1) th output module and the first end of the second switch of the nth output module in series, the first output end and the second output end are connected with a load in parallel, the output positive end of the first output module is connected with the first output end, and the output negative end of the Nth output module is connected with the second output end. According to the multi-output-module voltage doubling circuit, the composition form of output voltage can be enriched, adjustment is flexible, the output voltage range can be expanded to N times of the output voltage of a single output module, the utilization rate of an output capacitor is improved, and the multi-output-module voltage doubling circuit is simple, reliable and low in cost.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy conversion, and in particular to a multi-output module voltage doubling circuit. Background Art

[0002] As the demand in practical applications increases, the output voltage range of charging piles needs to be further expanded. Figure 1 Taking the Swiss-LLC converter in as an example, the three-phase AC voltage u A 、u B 、u C The two terminals are respectively input to the input of the AC / DC rectifier circuit 11, the AC / DC rectifier circuit 11 outputs direct current to the three terminals PYN, the DC / DC resonant circuit 13 converts the electric energy of the three terminals PYN, the output of the DC / DC resonant circuit 13 is connected to the load, and a bidirectional switch S is added on the secondary side. s , a high-frequency diode on the secondary side is used to form a voltage doubler rectifier. Through high-frequency switching of the bidirectional switch, the secondary rectifier circuit can be transformed from a full-bridge rectifier structure to a voltage doubler rectifier structure, and the output voltage can be doubled quickly. However, the conduction loss of this bidirectional switch is too high, resulting in high cost and large loss of the power supply. Summary of the invention

[0003] The present invention aims to provide a multi-output module voltage doubling circuit with high efficiency, low cost and low loss to achieve output voltage expansion.

[0004] To achieve the above object, the technical solution of the present invention is:

[0005] A multi-output module voltage doubling circuit is used for a switching power supply with N output modules, comprising a plurality of switches, wherein the output negative ends of the first output module to the N-1th output module are each connected in series with a first switch, and the output positive ends of the second output module to the Nth output module are each connected in series with a second switch, the first end of the first switch is connected to the output negative end of the output module, the second end of the first switch is connected to the second output end, the first end of the second switch is connected to the output positive end of the output module, and the second end of the second switch is connected to the first output end, a third switch is connected in series between the first end of the first switch of the n-1th output module and the first end of the second switch of the nth output module, the first output end and the second output end are connected in parallel with a load, the output positive end of the first output module is connected to the first output end, and the output negative end of the Nth output module is connected to the second output end, wherein N is a natural number not less than 2, and n is a natural number greater than 1 but not greater than N.

[0006] In a specific embodiment of the present invention, the first switch is a diode, the cathode of the diode is the first end of the first switch, and the anode of the diode is the second end of the first switch; the second switch is a diode, the anode of the diode is the first end of the second switch, and the cathode of the diode is the second end of the second switch.

[0007] In a specific embodiment of the present invention, the first switch, the second switch, and the third switch are MOSFETs.

[0008] In a specific embodiment of the present invention, the first switch, the second switch, and the third switch are relays.

[0009] In a specific embodiment of the present invention, when the first switch and the second switch are turned on and the third switch is turned off, the voltage between the first output terminal and the second output terminal is the output voltage of a single output module.

[0010] In a specific embodiment of the present invention, when the first switch and the second switch are turned off and the third switch is turned on, the voltage between the first output terminal and the second output terminal is N times the output voltage of a single output module.

[0011] The present invention also provides a switching power supply, comprising the above-mentioned multi-output module voltage doubling circuit and a plurality of output modules, wherein the plurality of output modules and the multi-output module voltage doubling circuit are connected in parallel.

[0012] In a specific embodiment of the present invention, the switching power supply is a Swiss-LLC converter.

[0013] Beneficial effect: The multi-output module voltage doubling circuit of the present invention can enrich the composition form of the output voltage and flexibly adjust it so that the output voltage range can be expanded to N times the output voltage of a single output module, thereby improving the utilization rate of the output capacitor and being simple, reliable and low-cost.

[0014] In order to make the above features and advantages of the invention more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the Swiss-LLC converter circuit with a bidirectional switch added to the secondary side.

[0016] Figure 2 The present invention is a schematic structural diagram of a multi-output module voltage doubling circuit.

[0017] Figure 3 The diagram is a circuit diagram of a multi-output module voltage doubling circuit having two output modules.

[0018] Figure 4 The diagram is a circuit diagram of a multi-output module voltage doubling circuit having four output modules.

[0019] Figure 5 for Figure 2 A specific embodiment of a voltage doubling circuit with multiple output modules.

[0020] In the drawings, like reference numerals refer to the same drawing elements. DETAILED DESCRIPTION

[0021] In order to make the purpose and technical solution of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Figure 2 FIG. 1 is a circuit diagram of a multi-output module voltage doubling circuit of the present invention. Figure 2 As shown, the switching power supply includes N output modules, and the multi-output module voltage doubling circuit 24 includes M switches. The output positive end of the first output module 2331 is connected to the first output terminal OUT1, the output negative end of the first output module 2331 is connected to the first end of the switch S1, and the second end of the switch S1 is connected to the second output terminal OUT2. The output positive end of the second output module 2332 is connected to the first end of the switch S3, and the second end of the switch S3 is connected to the first output terminal OUT1. The output negative end of the second output module 2332 is connected to the first end of the switch S4, and the second end of the switch S4 is connected to the second output terminal OUT2. The output positive end of the third output module 2333 is connected to the first end of the switch S6, and the second end of the switch S6 is connected to the first output terminal OUT1. The output negative end of the third output module 2333 is connected to the first end of the switch S7, and the second end of the switch S7 is connected to the second output terminal OUT2. And so on, until the output positive end of the Nth output module 233N is connected to the switch S M The first end of the switch S M The second end of the switch S5 is connected to the first output end OUT1, the output negative end of the Nth output module 233N is connected to the second output end OUT2, the first end of the switch S2 is connected to the first end of the switch S1, the second end of the switch S2 is connected to the first end of the switch S3, the first end of the switch S5 is connected to the first end of the switch S4, the second end of the switch S5 is connected to the first end of the switch S6, the first end of the switch S8 is connected to the first end of the switch S7, the second end of the switch S8 is connected to the first end of the switch S9 (not shown in the figure), and so on, until the switch S M-1 The first end of the switch S M-2 The first end (not shown in the figure), switch S M-1 The second end is connected to S M The first output terminal OUT1 and the first output terminal OUT2 are connected in parallel to the load. Wherein, N is a natural number not less than 2, and M is a natural number not less than 3.

[0023] In a specific embodiment, switches S1 to SM It can be a MOSFET or a relay.

[0024] The following takes the Swiss-LLC converter as an example to introduce the principle of a multi-output module voltage doubling circuit of the present invention. Figure 3 As shown, the three-phase AC voltage u A 、u B 、u C The AC / DC rectifier circuit 31 is respectively inputted, the AC / DC rectifier circuit 31 outputs direct current to the three terminals PYN, the DC / DC resonant circuit 33 converts the electric energy of the three terminals PYN, the output of the DC / DC resonant circuit 33 is connected to the input of the multi-output module voltage doubler circuit 34, and the multi-output module voltage doubler circuit 34 outputs a voltage U dc To load R o .

[0025] Furthermore, the Swiss-LLC converter further includes a capacitor circuit 32 , which is connected in parallel between the AC / DC rectifier circuit 31 and the DC / DC resonant circuit 33 .

[0026] Furthermore, the DC / DC resonant circuit 33 includes a multilevel switch module 331, a resonant conversion module 332, an output module 3331 and an output module 3332, the multilevel switch module 331 and the resonant conversion module 332 are connected in parallel, the first output of the resonant conversion module 332 is connected in parallel with the output module 3331, and the second output of the resonant conversion module 332 is connected in parallel with the output module 3332.

[0027] Furthermore, the AC / DC rectifier circuit 31 is a Swiss rectifier circuit, and the AC / DC rectifier circuit 31 includes a bidirectional switch S ay , S by , S cy , bidirectional switch S ay , S by , S cy At the moment when the two phase voltages intersect, the low-frequency switch is turned on. The bidirectional switch of the phase with the larger absolute value of the voltage amplitude of the two intersecting phases is turned off, and the bidirectional switch of the phase with the smaller amplitude is turned on. In this way, the phase with the larger amplitude of the forward voltage passes through the upper diode D u Connect to the P terminal, and the phase with the larger negative voltage amplitude passes through the lower diode D d Connect to the N terminal, and the remaining phase is connected through the conducting bidirectional switch S y Connect to the Y terminal.

[0028] Furthermore, the capacitor circuit 32 includes a capacitor C PY , capacitor C YN With capacitor C PN , capacitor C PYConnected in parallel between the P terminal and the Y terminal, the capacitor C YN Connected in parallel between the Y terminal and the N terminal, the capacitor C PN Connect in parallel between the P terminal and the N terminal.

[0029] Furthermore, the multi-level switch module 331 includes a switch S y1 , switch S y2 , switch S y3 , switch S y4 , switch S a1 , switch S a2 , switch S b1 , switch S b2 , switch S y1 The drain of the switch is connected to the Y terminal. y1 The source connection switch S y2 The source of the switch S y3 The drain of the switch is connected to the Y terminal. y3 The source connection switch S y4 The source of the switch S a1 The drain of the switch is connected to the P terminal, and the switch S a1 The source connection switch S a2 The drain of the switch S a2 The source of the switch S is connected to the N terminal. y2 The drain of the switch S a1 The source of the switch S b1 The drain of the switch is connected to the P terminal, and the switch S b1 The source connection switch S b2 The drain of the switch S b2 The source of the switch S is connected to the N terminal. y4 The drain of the switch S b1 The source of the switch S a1 The source connection inductor L r The first end of the inductor L r The second end of the primary winding of the transformer T1 is connected to the first end of the primary winding of the transformer T2, and the second end of the primary winding of the transformer T2 is connected to the capacitor C. r The first end of the capacitor C r The second end of the switch S y4 The drain inductor L m1 The first end of the inductor L is connected r The second end of the inductor L m1 The second end of the inductor L m2 The first end of the inductor L m2 The second end of the capacitor C rThe first end of the secondary winding of the transformer T1 is connected to the first output of the resonant conversion module 332, and the two ends of the secondary winding of the transformer T2 are connected to the second output of the resonant conversion module 332.

[0030] Furthermore, the output module 3331 includes a diode D a1 、Diode D a2 、Diode D a3 With diode D a4 The first end of the secondary winding of transformer T1 is connected to the diode D a1 With diode D a2 The second end of the secondary winding of transformer T1 is connected to the diode D a3 With diode D a4 The series midpoint.

[0031] Furthermore, the output module 3332 includes a diode D b1 、Diode D b2 、Diode D b3 With diode D b4 The first end of the secondary winding of transformer T2 is connected to the diode D b1 With diode D b2 The second end of the secondary winding of transformer T2 is connected to the diode D b3 With diode D b4 The series midpoint.

[0032] Furthermore, the multi-output module voltage doubling circuit 34 includes a switch S1, a switch S2, and a switch S3. The output positive end of the output module 3331 is connected to the first output end OUT1, the output negative end of the output module 3331 is connected to the first end of the switch S1, the second end of the switch S1 is connected to the second output end OUT2, the output positive end of the output module 3332 is connected to the first end of the switch S3, the second end of the switch S3 is connected to the first output end OUT1, the output negative end of the output module 3332 is connected to the second output end OUT2, the first end of the switch S2 is connected to the first end of the switch S1, the second end of the switch S2 is connected to the first end of the switch S3, and the first output end OUT1 and the second output end OUT2 output a voltage U dc To the load, the output voltage of each output module is U o .

[0033] When the switch S1 and the switch S3 are turned on, the switch S2 is turned off, the output module 3331 and the output module 3332 are connected in parallel, and the voltage U dc Equal to the output voltage U of a single output module o When the switch S1 and the switch S3 are turned off, the switch S2 is turned on, the output module 3331 and the output module 3332 are connected in series, and the voltage U dc Equal to 2Uo .

[0034] Figure 4 is another specific embodiment of the Swiss-LLC converter, Figure 4 The Swiss-LLC converter in the embodiment is a four-cavity parallel structure. The structure and working principle of the AC / DC rectifier circuit 41 and the capacitor circuit 42 are similar to those of the embodiment of the present invention. Figure 3 The same as in, no further description is given here.

[0035] Furthermore, in the multi-level switch module 431, the switch S y1 The drain of the switch is connected to the Y terminal. y1 The source connection switch S y2 The source of the switch S y3 The drain of the switch is connected to the Y terminal. y3 The source connection switch S y4 The source of the switch S y5 The drain of the switch is connected to the Y terminal. y5 The source connection switch S y6 The source of the switch S y7 The drain of the switch is connected to the Y terminal. y7 The source connection switch S y8 The source of the switch S a1 The drain of the switch is connected to the P terminal, and the switch S a1 The source connection switch S a2 The drain of the switch S a2 The source of the switch S is connected to the N terminal. y2 The drain of the switch S a1 The source of the switch S b1 The drain of the switch is connected to the P terminal, and the switch S b1 The source connection switch S b2 The drain of the switch S b2 The source of the switch S is connected to the N terminal. y4 The drain of the switch S b1 The source of the switch S c1 The drain of the switch is connected to the P terminal, and the switch S c1 The source connection switch S c2 The drain of the switch S c2 The source of the switch S is connected to the N terminal. y6 The drain of the switch S c1 The source of the switch S d1 The drain of the switch is connected to the P terminal, and the switch S d1 The source connection switch S d2 The drain of the switch S d2 The source of the switch S is connected to the N terminal. y8 The drain of the switch S d1 The source of the switch S a1The source connection inductor L ra The first end of the inductor L ra The second end of the transformer T a The first end of the primary winding of the transformer T a The second end of the primary winding is connected to capacitor C ra The first end of the inductor L ma Connected in parallel to transformer T a At both ends of the primary winding, switch S b1 The source connection inductor L rb The first end of the inductor L rb The second end of the transformer T b The first end of the primary winding of the transformer T b The second end of the primary winding is connected to capacitor C rb The first end of the inductor L mb Connected in parallel to transformer T b At both ends of the primary winding, switch S c1 The source connection inductor L rc The first end of the inductor L rc The second end of the transformer T c The first end of the primary winding of the transformer T c The second end of the primary winding is connected to capacitor C rc The first end of the inductor L mc Connected in parallel to transformer T c At both ends of the primary winding, switch S d1 The source connection inductor L rd The first end of the inductor L rd The second end of the transformer T d The first end of the primary winding of the transformer T d The second end of the primary winding is connected to capacitor C rd The first end of the inductor L md Connected in parallel to the transformer T d The capacitor C ra , capacitor C rb , capacitor C rc , capacitor C rd The second ends of the .

[0036] Transformer a The two ends of the secondary winding are the output of the resonant conversion module 4321, and the transformer T b The two ends of the secondary winding are the output of the resonant conversion module 4322, and the transformer T c The two ends of the secondary winding are the output of the resonant conversion module 4323, and the transformer T d The two ends of the secondary winding are the outputs of the resonant conversion module 4324.

[0037] Furthermore, the output module 4331 includes a diode D a1 、Diode D a2 、Diode D a3 With diode D a4 The rectifier bridge, transformer T a The first end of the secondary winding is connected to the diode D a1 With diode D a2 The series midpoint of the transformer T a The second end of the secondary winding is connected to the diode D a3 With diode D a4 The output module 4332 includes a diode D b1 、Diode D b2 、Diode D b3 With diode D b4 The rectifier bridge, transformer T b The first end of the secondary winding is connected to the diode D b1 With diode D b2 The series midpoint of the transformer T b The second end of the secondary winding is connected to the diode D b3 With diode D b4 The output module 4333 includes a diode D c1 、Diode D c2 、Diode D c3 With diode D c4 The rectifier bridge, transformer T c The first end of the secondary winding is connected to the diode D c1 With diode D c2 The series midpoint of the transformer T c The second end of the secondary winding is connected to the diode D c3 With diode D c4 The output module 4334 includes a diode D d1 、Diode D d2 、Diode D d3 With diode D d4 The rectifier bridge, transformer T d The first end of the secondary winding is connected to the diode D d1 With diode D d2 The series midpoint of the transformer T d The second end of the secondary winding is connected to the diode D d3 With diode D d4 The series midpoint.

[0038] Furthermore, the multi-output module voltage doubling circuit 44 includes a plurality of switches, the output positive end of the output module 4331 is connected to the first output terminal OUT1, the output negative end of the output module 4331 is connected to the first end of the switch S1, the second end of the switch S1 is connected to the second output terminal OUT2, the output positive end of the output module 4332 is connected to the first end of the switch S3, the second end of the switch S3 is connected to the first output terminal OUT1, the output negative end of the output module 4332 is connected to the first end of the switch S4, the second end of the switch S4 is connected to the second output terminal OUT2, the output positive end of the output module 4333 is connected to the first end of the switch S6, the second end of the switch S6 is connected to the first output terminal OUT1, and the output The output negative end of the output module 4333 is connected to the first end of the switch S7, the second end of the switch S7 is connected to the second output end OUT2, the output positive end of the output module 4334 is connected to the first end of the switch S9, the second end of the switch S9 is connected to the first output end OUT1, the first end of the switch S2 is connected to the first end of the switch S1, the second end of the switch S2 is connected to the first end of the switch S3, the first end of the switch S5 is connected to the first end of the switch S4, the second end of the switch S5 is connected to the first end of the switch S6, the first end of the switch S8 is connected to the first end of the switch S7, the second end of the switch S8 is connected to the first end of the switch S9, and the first output end OUT1 and the second output end OUT2 output a voltage U dc , the output voltage of each output module is U o .

[0039] When switch S1, switch S3, switch S4, switch S6, switch S7, and switch S9 are turned on, and switch S2, switch S5, and switch S8 are turned off, output modules 4331, output modules 4332, output modules 4333, and output modules 4334 are connected in parallel, and the voltage U dc Equal to the output voltage U of a single output module o .

[0040] When switch S4, switch S6, switch S2, and switch S8 are turned on and the other switches are turned off, output module 4331 is connected in series with output module 4332, and output module 4333 is connected in series with output module 4334, and then in parallel, the voltage U dc Equal to 2U o .

[0041] When switch S2, switch S5, and switch S8 are turned on and the other switches are turned off, output modules 4331, 4332, 4333, and 4334 are connected in series, and the voltage U dc Equal to 4U o .

[0042] for Figure 2 A switching power supply with N output modules, voltage U dc Scalable to N times U o .

[0043] In another specific embodiment of the present invention, the switch connected in series to the positive output terminal or the negative output terminal of each output module is a diode, such as Figure 5 As shown, the output positive terminal of the first output module 5331 is connected to the first output terminal OUT1, the output negative terminal of the first output module 5331 is connected to the cathode of the diode S1, the anode of the diode S1 is connected to the second output terminal OUT2, the output positive terminal of the second output module 5332 is connected to the anode of the diode S3, the cathode of the diode S3 is connected to the first output terminal OUT1, the output negative terminal of the second output module 5332 is connected to the cathode of the diode S4, the anode of the diode S4 is connected to the second output terminal OUT2, the output positive terminal of the third output module 5333 is connected to the anode of the diode S6, the cathode of the diode S6 is connected to the first output terminal OUT1, the output negative terminal of the third output module 5333 is connected to the cathode of the diode S7, the anode of the diode S7 is connected to the second output terminal OUT2, and so on, until the output positive terminal of the Nth output module 533N is connected to the diode S M The anode of the diode S M The cathode of the switch S1 is connected to the first output terminal OUT1, the first end of the switch S2 is connected to the cathode of the diode S1, the second end of the switch S2 is connected to the anode of the diode S3, the first end of the switch S5 is connected to the cathode of the diode S4, the second end of the switch S5 is connected to the anode of the diode S6, the first end of the switch S8 is connected to the cathode of the diode S7, the second end of the switch S8 is connected to the anode of the diode S9 (not shown in the figure), and so on, until the switch S M-1 The first end of the diode S M-2 The cathode of the switch S M-1 The second end of the diode S M anode.

[0044] When the two switches connected in series between the two diodes are turned off, namely switch S2, switch S5, switch S8, and finally switch S M-1 All diodes are naturally turned on under the action of the DC output current, and the output modules 5331, 5332, 5333, and 533N are connected in parallel. The voltage U dc Equal to the output voltage U of a single output module o .

[0045] When the two switches connected in series between the two diodes are turned on, namely switch S2, switch S5, switch S8, until switch S M-1 Open, all diodes are naturally disconnected, output modules 5331, 5332, 5333, and finally 533N are connected in series, and the voltage U dc Equal to NU oThe voltage at the positive output terminal of the output module is lower than the voltage at the first output terminal OUT1, the voltage at the negative output terminal of the output module is raised by the positive output terminal of the output module connected in series, and the voltage at the negative output terminal of the output module is higher than the voltage at the second output terminal OUT2.

[0046] In a specific embodiment, when the switching power supply has four output modules 5331 to 5334, when switches S2 and S8 are turned on, and switch S5 is turned off, output module 5331 is connected in series with output module 5332, and output module 5333 is connected in series with output module 5334, and then connected in parallel, the voltage U dc Equal to 2U o .

[0047] In a specific embodiment, when the switching power supply includes six output modules, the voltage U dc Can be U o or 2U o or 3U o or 6U o .

[0048] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Any person having ordinary knowledge in the technical field may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the attached patent application.

Claims

1. A multi-output module voltage doubling circuit, characterized in that: A switching power supply with N output modules comprises a plurality of switches, wherein the output negative ends of the first output module to the N-1th output module are each connected in series with a first switch, the output positive ends of the second output module to the Nth output module are each connected in series with a second switch, the first end of the first switch is connected to the output negative end of the output module, the second end of the first switch is connected to the second output end, the first end of the second switch is connected to the output positive end of the output module, the second end of the second switch is connected to the first output end, a third switch is connected in series between the first end of the first switch of the n-1th output module and the first end of the second switch of the nth output module, the first output end and the second output end are connected in parallel with a load, the output positive end of the first output module is connected to the first output end, and the output negative end of the Nth output module is connected to the second output end, wherein N is a natural number not less than 2, and n is a natural number greater than 1 but not greater than N.

2. A multi-output module voltage doubling circuit as claimed in claim 1, characterized in that: The first switch is a diode, the cathode of the diode is the first end of the first switch, and the anode of the diode is the second end of the first switch; the second switch is a diode, the anode of the diode is the first end of the second switch, and the cathode of the diode is the second end of the second switch.

3. A multi-output module voltage doubling circuit as claimed in claim 1, characterized in that: The first switch, the second switch, and the third switch are MOSFETs.

4. A multi-output module voltage doubling circuit as claimed in claim 1, characterized in that: The first switch, the second switch, and the third switch are relays.

5. A multi-output module voltage doubling circuit as claimed in claim 1, characterized in that: When the first switch and the second switch are turned on and the third switch is turned off, the voltage between the first output terminal and the second output terminal is the output voltage of a single output module.

6. A multi-output module voltage doubling circuit as claimed in claim 1, characterized in that: When the first switch and the second switch are turned off and the third switch is turned on, the voltage between the first output terminal and the second output terminal is N times the output voltage of a single output module.

7. A switching power supply, characterized in that: It comprises a multi-output module voltage doubling circuit as described in any one of claims 1 to 6 and a plurality of output modules, wherein the plurality of output modules and the multi-output module voltage doubling circuit are connected in parallel.

8. A switching power supply as claimed in claim 7, characterized in that: The switching power supply is a Swiss-LLC converter.

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