Single-stage ACDC topology circuit

Abstract

The invention relates to a single-stage ACDC topological circuit which comprises a first primary side power transmission module, a second primary side power transmission module and a secondary side power transmission module, the first primary side power transmission module and the second primary side power transmission module are arranged on the primary side of a transformer magnetic core, the secondary side power transmission module is arranged on the secondary side of the transformer magnetic core, and the first primary side power transmission module receives alternating current voltage output by an alternating current power supply. When the single-stage ACDC topology circuit is implemented, the first primary side power transmission module, the second primary side power transmission module and the secondary side power transmission module are controlled to work in four different working states respectively according to the instantaneous value of the alternating voltage, and therefore the single-stage ACDC topology circuit can be realized. Therefore, the input voltage of the AC side and the output voltage of the DC side can be limited by the working states, the problem that the difference between the input voltage and the output voltage is too large is solved, namely, the input and output voltage difference is reduced, the step-up ratio is reduced, the device loss is reduced, and the circuit efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of ADDC circuits, and more specifically, to a single-stage ACDC topology circuit. Background Art

[0002] Traditional alternating current (AC) and direct current (DC) modules usually include two-stage topology and single-stage topology. Although the ACDC module with a single-stage topology can realize the ACDC function, the ratio of the output voltage to the minimum input voltage is too large, resulting in a large voltage boost, so there is also the problem of low efficiency. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a single-stage ACDC topology circuit for the above-mentioned defects of the prior art, which can realize the ACDC function efficiently.

[0004] The technical solution adopted by the present invention to solve the technical problem is to construct a single-stage ACDC topology circuit, including: a first primary power transmission module and a second primary power transmission module arranged on the primary side of the transformer magnetic core, and a secondary power transmission module arranged on the secondary side of the transformer magnetic core, wherein the first primary power transmission module receives an AC voltage output by an AC power supply;

[0005] When the instantaneous value of the AC voltage is greater than zero and less than a first set value, the first primary power transmission module, the second primary power transmission module and the secondary power transmission module operate in a first working mode; when the instantaneous value of the AC voltage is greater than the first set value, the first primary power transmission module, the second primary power transmission module and the secondary power transmission module operate in a second working mode; when the instantaneous value of the AC voltage is less than zero and greater than a second set value, the first primary power transmission module, the second primary power transmission module and the secondary power transmission module operate in a third working mode; when the instantaneous value of the AC voltage is less than the second set value, the first primary power transmission module, the second primary power transmission module and the secondary power transmission module operate in a fourth working mode.

[0006] In the single-stage ACDC topology circuit of the present invention, the first setting value is 1 / 2 of the positive peak value of the AC voltage; the second setting value is 1 / 2 of the negative peak value of the AC voltage.

[0007] In the single-stage ACDC topology circuit of the present invention, the first primary power transmission module includes a power tube rectifier bridge, a first main power tube, a second main power tube, a first primary winding and a primary energy storage capacitor; the control ends of the first main power tube and the second main power tube receive control signals, the first end of the first main power tube is connected to the first end of the AC power supply, and the second end is connected to the first end of the first primary winding; the first end of the second main power tube is connected to the second end of the AC power supply, and the second end is connected to the first end of the power tube rectifier bridge; the second end of the first primary winding is connected to the second end of the power tube rectifier bridge, the third end of the power tube rectifier bridge is connected to the first end of the second primary power transmission module and the first end of the primary energy storage capacitor, and the fourth end is grounded; the second end of the primary energy storage capacitor is grounded.

[0008] In the single-stage ACDC topology circuit of the present invention, the second primary power transmission module includes a power tube rectifier half-bridge and a second primary winding; the first end of the power tube rectifier bridge is connected to the third end of the power tube rectifier bridge, the second end is grounded, and the third end is connected to the first end of the second primary winding, and the second end of the second primary winding is connected to the second end of the first primary winding.

[0009] In the single-stage ACDC topology circuit of the present invention, when the instantaneous value of the AC voltage is greater than zero and less than a first set value, the first primary power transmission module, the second primary power transmission module and the secondary power transmission module operate in a first operating mode, including: when the instantaneous value of the AC voltage is greater than zero and less than the first set value, the AC power supply stores energy for the first primary winding under the control of the power tube rectifier bridge, the first main power tube, and the second main power tube, and then the first primary winding and the primary energy storage capacitor simultaneously transmit power to the secondary power transmission module under the control of the power tube rectifier bridge, the power tube rectifier half-bridge, the first main power tube, and the second main power tube;

[0010] When the instantaneous value of the AC voltage is greater than the first set value, the first primary power transmission module, the second primary power transmission module and the secondary power transmission module operate in a second operating mode; including: when the instantaneous value of the AC voltage is greater than the first set value, the AC power supply simultaneously transmits power to the primary energy storage capacitor and to the secondary power transmission module under the control of the power tube rectifier bridge, the first main power tube and the second main power tube;

[0011] When the instantaneous value of the AC voltage is less than zero and greater than a second set value, the first primary power transmission module, the second primary power transmission module and the secondary power transmission module operate in a third operating mode, including: when the instantaneous value of the AC voltage is less than zero and greater than the second set value, the AC power supply stores energy for the first primary winding under the control of the power tube rectifier bridge, the first main power tube and the second main power tube, and then the AC power supply and the primary energy storage capacitor simultaneously transmit power to the secondary power transmission module under the control of the power tube rectifier bridge, the power tube rectifier half-bridge, the first main power tube and the second main power tube;

[0012] When the instantaneous value of the AC voltage is less than the second set value, the first primary power transmission module, the second primary power transmission module and the secondary power transmission module operate in a fourth operating mode, including: when the instantaneous value of the AC voltage is less than the second set value, the AC power supply simultaneously transmits power to the primary energy storage capacitor and to the secondary power transmission module under the control of the power tube rectifier bridge, the first main power tube and the second main power tube.

[0013] In the single-stage ACDC topology circuit of the present invention, the power tube rectifier bridge includes a first power tube, a second power tube, a third power tube and a fourth power tube; the power tube half bridge includes a fifth power tube and a sixth power tube;

[0014] The control ends of the first power tube, the second power tube, the third power tube, the fourth power tube, the fifth power tube and the sixth power tube receive control signals respectively;

[0015] The first end of the first power tube is connected to the second end of the second power tube, the first end of the third power tube is connected to the second end of the fourth power tube, the first end of the fifth power tube is connected to the second end of the sixth power tube, the second end of the first power tube, the third power tube and the second end of the fifth power tube are connected to the first end of the primary energy storage capacitor, and the first end of the second power tube, the fourth power tube and the first end of the sixth power tube are grounded.

[0016] In the single-stage ACDC topology circuit of the present invention, the secondary power transmission module includes a secondary winding, a secondary rectifier bridge, a secondary energy storage capacitor and a load; the first end of the secondary winding is connected to the first end of the secondary rectifier bridge, and the second end is connected to the second end of the secondary rectifier bridge, the third end of the secondary rectifier bridge is connected to the first end of the secondary energy storage capacitor and the first end of the load, and the fourth end of the secondary rectifier bridge, the second end of the secondary energy storage capacitor and the second end of the load are grounded.

[0017] In the single-stage ACDC topology circuit of the present invention, when the instantaneous value of the AC voltage is greater than zero and less than a first set value, the AC power supply stores energy for the first primary winding under the control of the power tube rectifier bridge, the first main power tube, and the second main power tube, and then the first primary winding and the primary energy storage capacitor simultaneously transmit power to the secondary power transmission module under the control of the power tube rectifier bridge, the power tube rectifier half-bridge, the first main power tube, and the second main power tube, including:

[0018] When the instantaneous value of the AC voltage is greater than zero and less than a first set value; in the first stage, the first end of the AC power supply, the first main power tube, the first primary winding, the fourth power tube, the third power tube, the second main power tube and the second end of the AC power supply form a power loop to store energy for the first primary winding; then in the second stage; the first end of the AC power supply, the first main power tube, the first primary winding, the second primary winding, the sixth power tube, the third power tube, the second main power tube and the second end of the AC power supply form a power loop so that the energy of the first primary winding is injected into the second primary winding and transmits power to the load through the secondary winding and the secondary rectifier bridge, and at the same time, the secondary energy storage capacitor, the second power tube, the second primary winding, the sixth power tube and the primary energy storage capacitor form a power loop so that the primary energy storage capacitor transmits power to the load through the second primary winding, the secondary winding and the secondary rectifier bridge;

[0019] When the instantaneous value of the AC voltage is greater than the first set value, the AC power supply simultaneously transmits power to the primary energy storage capacitor and to the secondary power transmission module under the control of the power tube rectifier bridge, the first main power tube, and the second main power tube, including:

[0020] When the instantaneous value of the AC voltage is greater than the first set value, the first end of the AC power supply, the first main power tube, the first primary winding, the second power tube, the primary energy storage capacitor, the third power tube, the second main power tube and the second end of the AC power supply form a power loop so that the AC power supply transmits power to the primary energy storage capacitor and the load simultaneously through the second primary winding;

[0021] When the instantaneous value of the AC voltage is less than zero and greater than a second set value, the AC power supply stores energy for the first primary winding under the control of the power tube rectifier bridge, the first main power tube, and the second main power tube, and then the AC power supply and the primary energy storage capacitor simultaneously transmit power to the secondary power transmission module under the control of the power tube rectifier bridge, the power tube rectifier half-bridge, the first main power tube, and the second main power tube, including:

[0022] When the instantaneous value of the AC voltage is less than zero and greater than a second set value; in the first stage, the first end of the AC power supply, the first main power tube, the first primary winding, the fourth power tube, the third power tube, the second main power tube and the second end of the AC power supply form a power loop to store energy for the first primary winding; in the second stage, the second end of the AC power supply, the second main power tube, the first power tube, the fifth power tube, the second primary winding, the first primary winding, the first main power tube, and the first end of the AC power supply form a power loop so that the AC power supply transmits power to the load through the first primary winding and the second primary winding, the secondary winding and the secondary rectifier bridge, and at the same time, the secondary energy storage capacitor, the fifth power tube, the second primary winding and the primary energy storage capacitor form a power loop so that the primary energy storage capacitor transmits power to the load through the second primary winding, the secondary winding and the secondary rectifier bridge;

[0023] When the instantaneous value of the AC voltage is less than the second set value, the AC power supply simultaneously transmits power to the primary energy storage capacitor and to the secondary power transmission module under the control of the power tube rectifier bridge, the first main power tube, and the second main power tube, including:

[0024] When the instantaneous value of the AC voltage is less than the second set value, the first primary winding, the second power tube, the primary energy storage capacitor, the third power tube, the second main power tube, the first end of the AC power supply, the second end of the AC power supply, and the first main power tube form a power loop so that the AC power supply simultaneously transmits energy to the primary energy storage capacitor and transmits energy to the load through the first primary winding.

[0025] In the single-stage ACDC topology circuit of the present invention, the secondary rectifier bridge includes a first diode, a second diode, a third diode and a fourth diode;

[0026] The anode of the first diode is connected to the first end of the secondary winding and the cathode of the third diode, and the cathode is connected to the cathode of the second diode; the anode of the second diode is connected to the second end of the secondary winding and the cathode of the fourth diode, and the anode of the third diode and the anode of the fourth diode are grounded.

[0027] In the single-stage ACDC topology circuit of the present invention, the power tube includes a MOS tube, an IGBT tube and a triode.

[0028] The single-stage ACDC topology circuit of the present invention controls the first primary power transmission module, the second primary power transmission module and the secondary power transmission module to work in four different working states respectively according to the instantaneous value of the AC voltage, so that the input voltage on the AC side and the output voltage on the DC side can be limited by their working states, thereby solving the problem of excessive difference between the input voltage and the output voltage, that is, reducing the input-output voltage difference, reducing the step-up ratio, reducing device losses, and thus improving circuit efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0030] Figure 1 It is a schematic diagram of a single-stage ACDC topology circuit of the present invention;

[0031] Figure 2 1 is a circuit diagram of a preferred embodiment of a single-stage ACDC topology circuit of the present invention;

[0032] Figures 3A to 3D They are Figure 2 The power flow diagram of the single-stage ACDC topology circuit shown in the first working state, the second working state, the third working state and the fourth working state;

[0033] Figure 4 It is a timing diagram of four working states of the single-stage ACDC topology circuit of the present invention;

[0034] Figures 5A to 5H It is a control signal timing diagram of each power tube in the single-stage ACDC topology circuit of the present invention. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] Figure 1 : is a principle block diagram of a single-stage ACDC topology circuit of the present invention. Figure 1 As shown, the single-stage ACDC topology circuit of the present invention includes: a first primary power transmission module 100, a second primary power transmission module 200, and a secondary power transmission module 300 arranged on the secondary side of the transformer core T, wherein the first primary power transmission module 100 receives the AC voltage output by the AC power supply VAC. When the instantaneous value of the AC voltage is greater than zero and less than a first set value, the first primary power transmission module 100, the second primary power transmission module 200 and the secondary power transmission module 300 operate in a first working mode; when the instantaneous value of the AC voltage is greater than the first set value, the first primary power transmission module 100, the second primary power transmission module 200 and the secondary power transmission module 300 operate in a second working mode; when the instantaneous value of the AC voltage is less than zero and greater than the second set value, the first primary power transmission module 100, the second primary power transmission module 200 and the secondary power transmission module 300 operate in a third working mode; when the instantaneous value of the AC voltage is less than the second set value, the first primary power transmission module 100, the second primary power transmission module 200 and the secondary power transmission module 300 operate in a fourth working mode.

[0037] In a preferred embodiment of the present invention, the first set value is 1 / 2 of the positive peak value of the AC voltage; the second set value is 1 / 2 of the negative peak value of the AC voltage. In another preferred embodiment of the present invention, the first set value and the second set value may also be fine-tuned, but they need to be ensured to be 1 / 2 of the positive peak value of the AC voltage and 1 / 2 of the negative peak value of the AC voltage, respectively.

[0038] The single-stage ACDC topology circuit of the present invention controls the first primary power transmission module, the second primary power transmission module and the secondary power transmission module to work in four different working states respectively according to the instantaneous value of the AC voltage, so that the input voltage on the AC side and the output voltage on the DC side can be limited by their working states, thereby solving the problem of excessive difference between the input voltage and the output voltage, that is, reducing the input-output voltage difference, reducing the step-up ratio, reducing device losses, and thus improving circuit efficiency.

[0039] In a preferred embodiment of the present invention, the first primary power transmission module 100 preferably includes a power tube rectifier bridge, a first main power tube, a second main power tube, a first primary winding and a primary energy storage capacitor; the second primary power transmission module 200 preferably includes a power tube rectifier half-bridge and a second primary winding.

[0040] In a preferred embodiment of the present invention, when the instantaneous value of the AC voltage is greater than zero and less than a first set value, the first primary power transmission module 100, the second primary power transmission module 200 and the secondary power transmission module 300 operate in a first operating mode, including: when the instantaneous value of the AC voltage is greater than zero and less than the first set value, the AC power supply stores energy for the first primary winding under the control of the power tube rectifier bridge, the first main power tube, and the second main power tube, and then the first primary winding and the primary energy storage capacitor simultaneously transmit power to the secondary power transmission module 300 under the control of the power tube rectifier bridge, the first main power tube, and the second main power tube. When the instantaneous value of the AC voltage is greater than the first set value, the first primary power transmission module 100, the second primary power transmission module 200 and the secondary power transmission module 300 operate in a second working mode; including: when the instantaneous value of the AC voltage is greater than the first set value, the AC power supply simultaneously transmits power to the primary energy storage capacitor and to the secondary power transmission module 300 under the control of the power tube rectifier bridge, the first main power tube and the second main power tube; when the instantaneous value of the AC voltage is less than zero and greater than the second set value, the first primary power transmission module 100, the second primary power transmission module 200 and the secondary power transmission module 300 operate in a third working mode, including: when the instantaneous value of the AC voltage is less than zero and greater than the second set value, the AC power supply and the primary energy storage capacitor simultaneously transmit power to the secondary power transmission module 300 under the control of the power tube rectifier bridge, the first main power tube and the second main power tube. When the instantaneous value of the AC voltage is less than the second set value, the first primary power transmission module 100, the second primary power transmission module 200 and the secondary power transmission module 300 operate in a fourth operating mode including: when the instantaneous value of the AC voltage is less than the second set value, the AC power supply simultaneously transmits power to the primary energy storage capacitor and to the secondary power transmission module 300 under the control of the power tube rectifier bridge, the first main power tube and the second main power tube.

[0041] The single-stage ACDC topology circuit of the present invention is implemented, according to the instantaneous value of the AC voltage, the first primary power transmission module, the second primary power transmission module and the secondary power transmission module are controlled to work in four different working states respectively. In different working states, different energy transmission methods are used to transmit power to the secondary power transmission module 300, thereby ensuring that in different working states, the input voltage on the AC side and the output voltage on the DC side can be limited by their working states, thereby solving the problem of excessive difference between the input voltage and the output voltage, that is, reducing the input-output voltage difference, reducing the boost ratio, reducing device losses, and thus improving circuit efficiency.

[0042] Figure 2 1 is a circuit diagram of a preferred embodiment of a single-stage ACDC topology circuit of the present invention. Figure 1-2 As shown, the single-stage ACDC topology circuit of the present invention comprises: a first primary power transmission module 100 and a second primary power transmission module 200 arranged on the primary side of the transformer magnetic core T, and a secondary power transmission module 300 arranged on the secondary side of the transformer magnetic core T, wherein the first primary power transmission module 100 receives the AC voltage output by the AC power source VAC. The secondary power transmission module 300 outputs a rectified voltage VDC.

[0043] The first primary power transmission module 100 includes a power tube rectifier bridge, a main power tube M7, a main power tube M8, a primary winding T1 and a primary energy storage capacitor C1; the control ends of the main power tube M7 and the main power tube M8 receive control signals, the first end of the main power tube M7 is connected to the first end of the AC power supply VAC, and the second end is connected to the first end of the primary winding T1; the first end of the main power tube M8 is connected to the second end of the AC power supply VAC, and the second end is connected to the first end of the power tube rectifier bridge; the second end of the primary winding T1 is connected to the second end of the power tube rectifier bridge, the third end of the power tube rectifier bridge is connected to the first end of the second primary power transmission module 200 and the first end of the primary energy storage capacitor C1, and the fourth end is grounded; the second end of the primary energy storage capacitor C1 is grounded. The second primary power transmission module 200 includes a power tube rectifier half-bridge and a primary winding T3; the first end of the power tube rectifier bridge is connected to the third end of the power tube rectifier bridge, the second end is grounded, the third end is connected to the first end of the primary winding T3, and the second end of the primary winding T3 is connected to the second end of the primary winding T1. In this preferred embodiment, because the main power tube M7 and the main power tube M8 are designed and connected between the AC power supply and the primary winding T3, it can be ensured that the primary winding T3 can feed back power to the AC power supply during the continuous current.

[0044] In a preferred embodiment of the present invention, when the instantaneous value of the AC voltage is greater than zero and less than a first set value, the first primary power transmission module 100, the second primary power transmission module 200 and the secondary power transmission module 300 operate in a first operating mode, including: when the instantaneous value of the AC voltage is greater than zero and less than a first set value, the AC power supply VAC stores energy for the primary winding T1 under the control of the power tube rectifier bridge, the main power tube M7, and the main power tube M8, and then the primary winding T1 and the primary energy storage capacitor C1 simultaneously transmit power to the secondary power transmission module 300 under the control of the power tube rectifier bridge, the power tube rectifier half-bridge, the main power tube M7, and the main power tube M8. When the instantaneous value of the AC voltage is greater than the first set value, the first primary power transmission module 100, the second primary power transmission module 200 and the secondary power transmission module 300 operate in the second operating mode; including: when the instantaneous value of the AC voltage is greater than the first set value, the AC power supply VAC simultaneously transmits power to the primary energy storage capacitor C1 and to the secondary power transmission module 300 under the control of the power tube rectifier bridge, the main power tube M7 and the main power tube M8. When the instantaneous value of the AC voltage is less than zero and greater than a second set value, the first primary power transmission module 100, the second primary power transmission module 200 and the secondary power transmission module 300 operate in a third operating mode, including: when the instantaneous value of the AC voltage is less than zero and greater than a second set value, the AC power supply VAC stores energy for the primary winding T1 under the control of the power tube rectifier bridge, the main power tube M7, and the main power tube M8, and then the AC power supply VAC and the primary energy storage capacitor C1 transmit power to the secondary power transmission module 300 under the control of the power tube rectifier bridge, the power tube rectifier half-bridge, the main power tube M7, and the main power tube M8. When the instantaneous value of the AC voltage is less than the second set value, the first primary power transmission module 100, the second primary power transmission module 200 and the secondary power transmission module 300 operate in a fourth operating mode including: when the instantaneous value of the AC voltage is less than the second set value, the AC power supply VAC simultaneously transmits power to the primary energy storage capacitor C1 and to the secondary power transmission module 300 under the control of the power tube rectifier bridge, the main power tube M7 and the main power tube M8.

[0045] exist Figure 2In the preferred embodiment shown, the power tube rectifier bridge includes power tube M1, power tube M2, power tube M3 and power tube M4; the power tube half bridge includes power tube M5 and power tube M6. The control ends of the power tube M1, the power tube M2, the power tube M3 and the power tube M4, the power tube M5 and the power tube M6 receive control signals respectively. In this preferred embodiment, the power tube M1 ( Figure 5A )、Power tube M2( Figure 5B )、Power tube M3( Figure 5C )、Power tube M4( Figure 5D )、Power tube M5( Figure 5E ) and power tube M6( Fig. 5F ) are shown in the control signal timing diagrams as follows: Figures 5A to 5F As shown. The main power tube M7 ( Figure 5G ) and the main power tube M8 ( Figure 5H ) are shown in the control signal timing diagrams as follows: Figures 5G to 5H As shown. Of course, in other preferred embodiments of the present invention, other control signal timings may also be used, as long as they can achieve the first working state, the second working state, the third working state and the fourth working state of the present invention. Those skilled in the art can design the control signals of each power tube according to actual needs, such as using PWM control signals. In order not to obscure the inventive point of the present invention, it will not be repeated here. In a preferred embodiment of the present invention, the power tube may include a MOS tube, an IGBT tube and a triode.

[0046] Further Figure 2 As shown, the first end of the power tube M1 is connected to the second end of the power tube M2, the first end of the power tube M3 is connected to the second end of the power tube M4, the first end of the power tube M5 is connected to the second end of the power tube M6, the second end of the power tube M1, the power tube M3 and the second end of the power tube M5 are connected to the first end of the primary energy storage capacitor C1, and the first end of the power tube M2, the power tube M4 and the first end of the power tube M6 are grounded.

[0047] Further Figure 2 As shown, the secondary power transmission module 300 includes a secondary winding T2, a secondary rectifier bridge, a secondary energy storage capacitor C2 and a load R1; the first end of the secondary winding T2 is connected to the first end of the secondary rectifier bridge, and the second end is connected to the second end of the secondary rectifier bridge, the third end of the secondary rectifier bridge is connected to the first end of the secondary energy storage capacitor C2 and the first end of the load R1, and the fourth end of the secondary rectifier bridge, the second end of the secondary energy storage capacitor C2 and the second end of the load R1 are grounded.

[0048] In a preferred embodiment of the present invention, when the instantaneous value of the AC voltage is greater than zero and less than a first set value, the AC power supply VAC stores energy for the primary winding T1 under the control of the power tube rectifier bridge, the main power tube M7, and the main power tube M8, and then the primary winding T1 and the primary energy storage capacitor C1 simultaneously transmit power to the secondary power transmission module 300 under the control of the power tube rectifier bridge, the main power tube M7, and the main power tube M8, including: when the instantaneous value of the AC voltage is greater than zero and less than the first set value; in the first stage, the first end of the AC power supply VAC, the main power tube M7, the primary winding T1, the power tube M4, the power tube M3, the main power tube M8 and the second end of the AC power supply VAC form a power loop from And store energy for the primary winding T1; then in the second stage; the first end of the AC power supply VAC, the main power tube M7, the primary winding T1, the primary winding T3, the power tube M6, the power tube M3, the main power tube M8 and the second end of the AC power supply VAC form a power loop so that the energy of the primary winding T1 is injected into the primary winding T3 and transmits power to the load R1 through the secondary winding T2 and the secondary rectifier bridge. At the same time, the secondary energy storage capacitor C2, the power tube M2, the primary winding T3, the power tube M6 and the primary energy storage capacitor C1 form a power loop so that the primary energy storage capacitor C1 transmits power to the load R1 through the primary winding T3, the secondary winding T2 and the secondary rectifier bridge.

[0049] For details, see Figure 4 The timing diagram of the working state shown in the figure, the first working state includes time periods t0-t1 and t2-t3. In this time period, when the instantaneous value of the AC voltage is greater than zero and less than the first set value, for example, the instantaneous value of the AC voltage is positive (i.e., greater than zero) and less than 1 / 2 of the positive peak value of the AC voltage. In this working state, the AC power supply VAC and the primary energy storage capacitor C1 transmit power to the load R1. The specific power circuit is as follows.

[0050] In the first stage, the control signals of each power tube are as follows: Figures 5A to 5H As shown, taking the power tube M4 as an example, Figure 5D During the on period of the power tube M4 shown, the primary winding T1 only stores energy. In this power flow, the first end of the AC power supply VAC ~ the main power tube M7 ~ the primary winding T1 ~ the power tube M4 ~ the power tube M3 ~ the main power tube M8 ~ the second end of the AC power supply VAC. Because at this time, the instantaneous value of the AC voltage is near the zero point, the voltage on the primary winding T1 is lower than the secondary energy storage capacitor C2 behind the secondary winding T2, and the primary winding T1 only stores energy.

[0051] In the second stage, the control signals of each power tube are as follows: Figures 5A to 5H As shown, taking the power tube M4 as an example, Figure 5D During the off period of the power tube M4 shown in FIG. 1 , the primary winding T1 and the primary energy storage capacitor C1 simultaneously transmit power to the load R1 , and the power flow diagram is shown in FIG. 1 . Figure 3A shown.

[0052] Specifically, the first end of the AC power supply VAC, the main power tube M7, the primary winding T1, the primary winding T3, the power tube M6, the power tube M3, the main power tube M8 and the second end of the AC power supply VAC form a first power loop, so that the energy of the primary winding T1 is injected into the primary winding T3 and transmits power to the load R1 through the secondary winding T2 and the secondary rectifier bridge. Here, the power flow is: the first end of the AC power supply VAC ~ the main power tube M7 ~ the primary winding T1 ~ the primary winding T3 (the secondary winding T2 ~ the secondary rectifier bridge ~ the load R1) ~ the power tube M6 ~ the power tube M3 ~ the main power tube M8 and the second end of the AC power supply VAC. At this time, the AC power supply VAC transmits power to the load R1.

[0053] During the off period of the power tube M4, since the voltage on the primary winding T1 is still near the zero point, power cannot be directly transmitted through the primary winding T1, so the power is transmitted through the primary winding T3 by injecting current into the primary winding T3. That is, the voltage on the primary winding T1 is still near the zero point, and the principle of power transmission is that the primary winding T3 injects current and indirectly transmits power to the load. The calculation formula is: The inductor voltage of the primary winding T3 is: i represents the inductor current, t represents the time, V represents the inductor voltage, and L represents the inductor value. Therefore, it can be known that as the current of the primary winding T3 increases, the inductor voltage increases, and thus the voltage of the load R1 increases, so power can be transmitted to the load.

[0054] At the same time, in the second stage, the secondary energy storage capacitor C2, the power tube M2, the primary winding T3, the power tube M6 and the primary energy storage capacitor C1 form a power loop so that the primary energy storage capacitor C1 transmits power to the load R1 through the primary winding T3, the secondary winding T2 and the secondary rectifier bridge. In this power flow, the secondary energy storage capacitor C2, the power tube M2, the primary winding T3 (the secondary winding T2 ~ the secondary rectifier bridge ~ the load R1), the power tube M6 and the primary energy storage capacitor C1. During the off period of the power tube M4, the voltage on the primary energy storage capacitor C1 is higher than the voltage of the secondary energy storage capacitor C2, so power can be transmitted. Based on the above, it can be seen that for the case where the voltage of the secondary energy storage capacitor C2 is higher than the AC power supply, the solution of the present invention may be subject to certain limitations, so the present invention is preferably applicable to the scenario where the voltage of the secondary energy storage capacitor C2 is lower than the peak voltage of the AC power supply based on the above.

[0055] In a preferred embodiment of the present invention, when the instantaneous value of the AC voltage is greater than the first set value, the AC power supply VAC, under the control of the power tube rectifier bridge, the main power tube M7, and the main power tube M8, simultaneously transmits power to the primary energy storage capacitor C1 and to the secondary power transmission module 300, including: when the instantaneous value of the AC voltage is greater than the first set value, the first end of the AC power supply VAC, the main power tube M7, the primary winding T1, the power tube M2, the primary energy storage capacitor C1, the power tube M3, the main power tube M8 and the second end of the AC power supply VAC form a power loop so that the AC power supply VAC simultaneously transmits power to the primary energy storage capacitor C1 and the load R1 through the primary winding T3.

[0056] For details, see Figure 4 The timing diagram of the working state shown in the figure, the second working state includes the time period t1-t2, during which the instantaneous value of the AC voltage is greater than the first set value, for example, the instantaneous value of the AC voltage is greater than 1 / 2 of the positive peak value of the AC voltage. In this working state, the AC power supply VAC transmits power to the primary energy storage capacitor C1 and the load R1 through the primary winding T3 at the same time, that is, the AC power supply VAC is the only power source, and part of the power it provides is supplied to the load R1, and part of it is used to store energy in the primary energy storage capacitor C1.

[0057] The control signals of each power tube are as follows: Figures 5A to 5H The power flow is shown as Figure 3BHere, the power flow is: the first end of the AC power supply VAC ~ the main power tube M7 ~ the primary winding T1 (the secondary winding T2 ~ the secondary rectifier bridge ~ the load R1) ~ the power tube M2 (body diode) ~ the primary energy storage capacitor C1 ~ the power tube M3 ~ the main power tube M8 and the second end of the AC power supply VAC.

[0058] In a preferred embodiment of the present invention, when the instantaneous value of the AC voltage is less than zero and greater than a second set value, the AC power supply VAC and the primary energy storage capacitor C1 simultaneously transmit power to the secondary power transmission module 300 under the control of the power tube rectifier bridge, the main power tube M7, and the main power tube M8, including: when the instantaneous value of the AC voltage is less than zero and greater than the second set value; in the first stage, the first end of the AC power supply VAC, the main power tube M7, the primary winding T1, the power tube M4, the power tube M3, the main power tube M8 and the second end of the AC power supply VAC form a power loop to store energy for the primary winding T1; in the second stage, the AC The second end of the AC power supply VAC, the main power tube M8, the power tube M1, the power tube M5, the primary winding T3, the primary winding T1, the main power tube M7, and the first end of the AC power supply VAC form a power loop so that the AC power supply VAC transmits power to the load R1 through the primary winding T1 and the primary winding T3, the secondary winding T2 and the secondary rectifier bridge. At the same time, the secondary energy storage capacitor C2, the power tube M5, the primary winding T3 and the primary energy storage capacitor C1 form a power loop so that the primary energy storage capacitor C1 transmits power to the load R1 through the primary winding T3, the secondary winding T2 and the secondary rectifier bridge.

[0059] For details, see Figure 4 As shown in the timing diagram of the working state, the third working state includes time periods t3-t4 and t5-t6 (t0). In this time period, when the instantaneous value of the AC voltage is less than zero and greater than the second set value, for example, when the instantaneous value of the AC voltage is negative (i.e., less than zero) and greater than 1 / 2 of the negative peak value of the AC voltage; the AC power supply VAC and the primary energy storage capacitor C1 jointly transmit power to the load R1.

[0060] The specific power circuit is as follows. In the first stage, the control signals of each power tube are as follows Figures 5A to 5H As shown, taking the power tube M3 as an example, Figure 5CDuring the on period of the power tube M3 shown, the primary winding T1 only stores energy. Here, the power flow is: the first end of the AC power supply VAC ~ the main power tube M7 ~ the primary winding T1 ~ the power tube M4 ~ the power tube M3 ~ the main power tube M8 and the second end of the AC power supply VAC. Because at this time, the instantaneous value of the AC voltage is near the zero point, the voltage on the primary winding T1 is lower than the secondary energy storage capacitor C2 after the secondary winding T2, and the primary winding T1 only stores energy.

[0061] In the second stage, the control signals of each power tube are as follows: Figures 5A to 5H As shown, taking the power tube M3 as an example, Figure 5C During the off period of the power tube M3 shown in FIG. 1 , the primary winding T1 and the primary energy storage capacitor C1 simultaneously transmit power to the load R1 , and the power flow diagram is shown in FIG. 1 . Figure 3C shown.

[0062] Specifically, the second end of the AC power supply VAC, the main power tube M8, the power tube M1, the power tube M5, the primary winding T3, the primary winding T1, the main power tube M7, and the first end of the AC power supply VAC form a first power loop so that the AC power supply VAC transmits power to the load R1 through the primary winding T1 and the primary winding T3, the secondary winding T2, and the secondary rectifier bridge, and its power flow is: the second end of the AC power supply VAC ~ the main power tube M8 ~ the power tube M1 ~ the power tube M5 ~ the primary winding T3 (the secondary winding T2 ~ the secondary rectifier bridge ~ the load R1) ~ the primary winding T1 (the secondary winding T2 ~ the secondary rectifier bridge ~ the load R1) ~ the main power tube M7 ~ the first end of the AC power supply VAC. In this way, the AC power supply VAC can simultaneously transmit power to the load R1 through the primary winding T3 and the primary winding T1.

[0063] At the same time, in the second stage, the secondary energy storage capacitor C2, the power tube M5, the primary winding T3 and the primary energy storage capacitor C1 form a power loop so that the primary energy storage capacitor C1 transmits power to the load R1 through the primary winding T3, the secondary winding T2 and the secondary rectifier bridge. Here, the power flow is: the secondary energy storage capacitor C2, the power tube M5, the primary winding T3 (the secondary winding T2 ~ the secondary rectifier bridge ~ the load R1) and the primary energy storage capacitor C1. During the off period of the power tube M3, the voltage on the primary energy storage capacitor C1 is higher than the voltage of the secondary energy storage capacitor C2, so power can be transmitted.

[0064] In a preferred embodiment of the present invention, when the instantaneous value of the AC voltage is less than the second set value, the AC power supply VAC, under the control of the power tube rectifier bridge, the main power tube M7, and the main power tube M8, simultaneously transmits power to the primary energy storage capacitor C1 and to the secondary power transmission module 300, including: when the instantaneous value of the AC voltage is less than the second set value, the primary winding T1, the power tube M2, the primary energy storage capacitor C1, the power tube M3, the main power tube M8, the first end of the AC power supply VAC, the second end of the AC power supply VAC, and the main power tube M7 form a power loop so that the AC power supply VAC simultaneously transmits power to the primary energy storage capacitor C1 and transmits power to the load R1 through the primary winding T1.

[0065] For details, see Figure 4 As shown in the timing diagram of the working state, the fourth working state includes the time period t4~t5. During this time period, the instantaneous value of the AC voltage is less than the second set value, for example, the instantaneous value of the AC voltage is less than 1 / 2 of the negative peak value of the AC voltage. In this working state, the AC power supply VAC transmits power to the primary energy storage capacitor C1 and the load R1 through the primary winding T3 at the same time, that is, the AC power supply VAC serves as the only power source, and part of the power it provides is supplied to the load R1, and part of it is used to store energy in the primary energy storage capacitor C1.

[0066] The control signals of each power tube are as follows: Figures 5A to 5H The power flow is shown as Figure 3D Here, the power flow is: the first end of the primary winding T1 (the secondary winding T2 ~ the secondary rectifier bridge ~ the load R1) ~ the power tube M2 (body diode) ~ the primary energy storage capacitor C1 ~ the power tube M3 ~ the main power tube M8 ~ the first end of the AC power supply VAC ~ the second end of the AC power supply VAC ~ the second end of the primary winding T1.

[0067] In a further preferred embodiment of the present invention, the secondary rectifier bridge includes a diode D1, a diode D2, a diode D3 and a diode D4; the anode of the diode D1 is connected to the first end of the secondary winding T2 and the cathode of the diode D3, and the cathode is connected to the cathode of the diode D2; the anode of the diode D2 is connected to the second end of the secondary winding T2 and the cathode of the diode D4, and the anode of the diode D3 and the anode of the diode D4 are grounded. Of course, rectifier bridges of other structures may also be used, such as a rectifier half-bridge composed of two switching tubes. In a further preferred embodiment of the present invention, a rectifier half-bridge or full-bridge composed of switching tubes may also be used, and these all fall within the protection scope of the present invention.

[0068] The single-stage ACDC topology circuit of the present invention is implemented, according to the instantaneous value of the AC voltage, the first primary power transmission module, the second primary power transmission module and the secondary power transmission module are controlled to work in four different working states respectively. In different working states, different energy transmission methods are used to transmit power to the secondary power transmission module, thereby ensuring that in different working states, the input voltage on the AC side and the output voltage on the DC side can be limited by their working states, thereby solving the problem of excessive difference between the input voltage and the output voltage, that is, reducing the input-output voltage difference, reducing the boost ratio, reducing device losses, and thus improving circuit efficiency.

[0069] Although the present invention is described by specific embodiments, it should be understood by those skilled in the art that various changes and equivalent substitutions may be made to the present invention without departing from the scope of the present invention. In addition, various modifications may be made to the present invention for specific situations or materials without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed, but should include all implementation methods falling within the scope of the claims of the present invention.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A single-stage ACDC topology circuit, characterized in that: include: A first primary power transmission module and a second primary power transmission module are arranged at the primary side of the transformer magnetic core, and a secondary power transmission module is arranged at the secondary side of the transformer magnetic core, wherein the first primary power transmission module receives an AC voltage output by an AC power supply; When the instantaneous value of the AC voltage is greater than zero and less than a first set value, the first primary power transmission module, the second primary power transmission module and the secondary power transmission module operate in a first working mode; when the instantaneous value of the AC voltage is greater than the first set value, the first primary power transmission module, the second primary power transmission module and the secondary power transmission module operate in a second working mode; when the instantaneous value of the AC voltage is less than zero and greater than a second set value, the first primary power transmission module, the second primary power transmission module and the secondary power transmission module operate in a third working mode; when the instantaneous value of the AC voltage is less than the second set value, the first primary power transmission module, the second primary power transmission module and the secondary power transmission module operate in a fourth working mode.

2. The single-stage ACDC topology circuit according to claim 1, characterized in that: The first setting value is 1 / 2 of the positive peak value of the AC voltage; the second setting value is 1 / 2 of the negative peak value of the AC voltage.

3. The single-stage ACDC topology circuit according to claim 1 or 2, characterized in that: The first primary power transmission module includes a power tube rectifier bridge, a first main power tube, a second main power tube, a first primary winding and a primary energy storage capacitor; the control ends of the first main power tube and the second main power tube receive control signals, the first end of the first main power tube is connected to the first end of the AC power supply, and the second end is connected to the first end of the first primary winding; the first end of the second main power tube is connected to the second end of the AC power supply, and the second end is connected to the first end of the power tube rectifier bridge; the second end of the first primary winding is connected to the second end of the power tube rectifier bridge, the third end of the power tube rectifier bridge is connected to the first end of the second primary power transmission module and the first end of the primary energy storage capacitor, and the fourth end is grounded; the second end of the primary energy storage capacitor is grounded.

4. The single-stage ACDC topology circuit according to claim 3, characterized in that: The second primary power transmission module includes a power tube rectifier half-bridge and a second primary winding; the first end of the power tube rectifier bridge is connected to the third end of the power tube rectifier bridge, the second end is grounded, and the third end is connected to the first end of the second primary winding, and the second end of the second primary winding is connected to the second end of the first primary winding.

5. The single-stage ACDC topology circuit according to claim 4, characterized in that: When the instantaneous value of the AC voltage is greater than zero and less than a first set value, the first primary power transmission module, the second primary power transmission module and the secondary power transmission module operate in a first operating mode, including: when the instantaneous value of the AC voltage is greater than zero and less than the first set value, the AC power supply stores energy for the first primary winding under the control of the power tube rectifier bridge, the first main power tube and the second main power tube, and then the first primary winding and the primary energy storage capacitor simultaneously transmit power to the secondary power transmission module under the control of the power tube rectifier bridge, the power tube rectifier half-bridge, the first main power tube and the second main power tube; When the instantaneous value of the AC voltage is greater than the first set value, the first primary power transmission module, the second primary power transmission module and the secondary power transmission module operate in a second operating mode; including: when the instantaneous value of the AC voltage is greater than the first set value, the AC power supply simultaneously transmits power to the primary energy storage capacitor and to the secondary power transmission module under the control of the power tube rectifier bridge, the first main power tube and the second main power tube; When the instantaneous value of the AC voltage is less than zero and greater than a second set value, the first primary power transmission module, the second primary power transmission module and the secondary power transmission module operate in a third operating mode, including: when the instantaneous value of the AC voltage is less than zero and greater than the second set value, the AC power supply stores energy for the first primary winding under the control of the power tube rectifier bridge, the first main power tube and the second main power tube, and then the AC power supply and the primary energy storage capacitor simultaneously transmit power to the secondary power transmission module under the control of the power tube rectifier bridge, the power tube rectifier half-bridge, the first main power tube and the second main power tube; When the instantaneous value of the AC voltage is less than the second set value, the first primary power transmission module, the second primary power transmission module and the secondary power transmission module operate in a fourth operating mode, including: when the instantaneous value of the AC voltage is less than the second set value, the AC power supply simultaneously transmits power to the primary energy storage capacitor and to the secondary power transmission module under the control of the power tube rectifier bridge, the first main power tube and the second main power tube.

6. The single-stage ACDC topology circuit according to claim 5, characterized in that: The power tube rectifier bridge includes a first power tube, a second power tube, a third power tube and a fourth power tube; the power tube half bridge includes a fifth power tube and a sixth power tube; The control ends of the first power tube, the second power tube, the third power tube, the fourth power tube, the fifth power tube and the sixth power tube receive control signals respectively; The first end of the first power tube is connected to the second end of the second power tube, the first end of the third power tube is connected to the second end of the fourth power tube, the first end of the fifth power tube is connected to the second end of the sixth power tube, the second end of the first power tube, the third power tube and the second end of the fifth power tube are connected to the first end of the primary energy storage capacitor, and the first end of the second power tube, the fourth power tube and the first end of the sixth power tube are grounded.

7. The single-stage ACDC topology circuit according to claim 6, characterized in that: The secondary power transmission module includes a secondary winding, a secondary rectifier bridge, a secondary energy storage capacitor and a load; the first end of the secondary winding is connected to the first end of the secondary rectifier bridge, the second end is connected to the second end of the secondary rectifier bridge, the third end of the secondary rectifier bridge is connected to the first end of the secondary energy storage capacitor and the first end of the load, and the fourth end of the secondary rectifier bridge, the second end of the secondary energy storage capacitor and the second end of the load are grounded.

8. The single-stage ACDC topology circuit according to claim 7, characterized in that: When the instantaneous value of the AC voltage is greater than zero and less than a first set value, the AC power supply stores energy for the first primary winding under the control of the power tube rectifier bridge, the first main power tube, and the second main power tube, and then the first primary winding and the primary energy storage capacitor simultaneously transmit power to the secondary power transmission module under the control of the power tube rectifier bridge, the power tube rectifier half-bridge, the first main power tube, and the second main power tube, including: When the instantaneous value of the AC voltage is greater than zero and less than a first set value; in the first stage, the first end of the AC power supply, the first main power tube, the first primary winding, the fourth power tube, the third power tube, the second main power tube and the second end of the AC power supply form a power loop to store energy for the first primary winding; then in the second stage; the first end of the AC power supply, the first main power tube, the first primary winding, the second primary winding, the sixth power tube, the third power tube, the second main power tube and the second end of the AC power supply form a power loop so that the energy of the first primary winding is injected into the second primary winding and transmits power to the load through the secondary winding and the secondary rectifier bridge, and at the same time, the secondary energy storage capacitor, the second power tube, the second primary winding, the sixth power tube and the primary energy storage capacitor form a power loop so that the primary energy storage capacitor transmits power to the load through the second primary winding, the secondary winding and the secondary rectifier bridge; When the instantaneous value of the AC voltage is greater than the first set value, the AC power supply simultaneously transmits power to the primary energy storage capacitor and to the secondary power transmission module under the control of the power tube rectifier bridge, the first main power tube, and the second main power tube, including: When the instantaneous value of the AC voltage is greater than the first set value, the first end of the AC power supply, the first main power tube, the first primary winding, the second power tube, the primary energy storage capacitor, the third power tube, the second main power tube and the second end of the AC power supply form a power loop so that the AC power supply transmits power to the primary energy storage capacitor and the load simultaneously through the second primary winding; When the instantaneous value of the AC voltage is less than zero and greater than a second set value, the AC power supply stores energy for the first primary winding under the control of the power tube rectifier bridge, the first main power tube, and the second main power tube, and then the AC power supply and the primary energy storage capacitor simultaneously transmit power to the secondary power transmission module under the control of the power tube rectifier bridge, the power tube rectifier half-bridge, the first main power tube, and the second main power tube, including: When the instantaneous value of the AC voltage is less than zero and greater than a second set value; in the first stage, the first end of the AC power supply, the first main power tube, the first primary winding, the fourth power tube, the third power tube, the second main power tube and the second end of the AC power supply form a power loop to store energy for the first primary winding; in the second stage, the second end of the AC power supply, the second main power tube, the first power tube, the fifth power tube, the second primary winding, the first primary winding, the first main power tube, and the first end of the AC power supply form a power loop so that the AC power supply transmits power to the load through the first primary winding and the second primary winding, the secondary winding and the secondary rectifier bridge, and at the same time, the secondary energy storage capacitor, the fifth power tube, the second primary winding and the primary energy storage capacitor form a power loop so that the primary energy storage capacitor transmits power to the load through the second primary winding, the secondary winding and the secondary rectifier bridge; When the instantaneous value of the AC voltage is less than the second set value, the AC power supply simultaneously transmits power to the primary energy storage capacitor and to the secondary power transmission module under the control of the power tube rectifier bridge, the first main power tube, and the second main power tube, including: When the instantaneous value of the AC voltage is less than the second set value, the first primary winding, the second power tube, the primary energy storage capacitor, the third power tube, the second main power tube, the first end of the AC power supply, the second end of the AC power supply, and the first main power tube form a power loop so that the AC power supply simultaneously transmits energy to the primary energy storage capacitor and transmits energy to the load through the first primary winding.

9. The single-stage ACDC topology circuit according to claim 8, characterized in that: The secondary side rectifier bridge comprises a first diode, a second diode, a third diode and a fourth diode; The anode of the first diode is connected to the first end of the secondary winding and the cathode of the third diode, and the cathode is connected to the cathode of the second diode; the anode of the second diode is connected to the second end of the secondary winding and the cathode of the fourth diode, and the anode of the third diode and the anode of the fourth diode are grounded.

10. The single-stage ACDC topology circuit according to claim 8, characterized in that: The power tubes include MOS tubes, IGBT tubes and triodes.

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