TWI729732B - Transformerless ac to ac conversion circuit - Google Patents

Abstract

The invention is a transformerless AC-to-AC conversion circuit, including: an input stage including: a first switch, a second switch, athird switch, and a fourth switch; a charging arm including; a fifth switch, a sixth switch, a seventh switch, an eighth switch, and a first capacitor unit; an output stage includes: a ninth switch, a tenth switch, an eleventh switch, a twelfth switch, a second capacitor unit, and a resistance unit; therefore, switching elements are used to achieve the effect of voltage transformation. Among them, only one level of high-frequency switching power stage can improve its conversion efficiency and simplify its control circuit complexity. Compared with transformers of the same specification, the components have smaller size and weight and better efficiency.

Description

Transformerless AC to AC conversion circuit

The present invention relates to an AC-to-AC conversion circuit; more specifically, it particularly refers to a transformerless AC-to-AC conversion circuit.

Traditional AC-to-AC conversion mostly uses low-frequency transformers that use electromagnetic conversion for step-up and down-boost. The transformers are mostly 60Hz or 50Hz AC transformers, which are large and heavy, which is inconvenient to use. If power electronic technology is not used for voltage transformation , The size of the device cannot be reduced.

If a high-frequency switching circuit is used for voltage conversion, although high-frequency switching can achieve the purpose of reducing the size of the transformer, it must be converted through three levels of AC to DC, DC to DC, and DC to AC in the process. In addition to the higher circuit cost, Its power conversion efficiency is relatively low, so its overall efficiency is relatively low. According to the transformer efficiency standards established by the US Department of Energy in 2007, the efficiency of single-phase transformers must be at least 98%, and this efficiency is in the design of power electronic converters. The above is a very difficult indicator, so there is still a lot of room for improvement in the development of solid-state transformers. There are many challenges in reducing costs and improving efficiency.

At present, in foreign research, the DC-to-DC stage of AC-to-AC converters mostly use dual active bridge (Dual Active Bridge, DAB), and the control method can use pure phase shifting for power transfer, and connect in parallel on the switch Capacitors and output inductors can achieve the effect of zero-voltage switching. At the same time, the use of Gallium Nitride (Gallium Nitride)-based semiconductor electronic components has a chance to continue to improve. However, multi-level conversion reduces the overall efficiency and is complicated Electricity Road structure and control methods will cause obstacles to product development.

In summary, therefore, switching elements are used to achieve the effect of voltage transformation. Among them, there is only one high-frequency switching power stage, which can improve its conversion efficiency and simplify its control circuit complexity. The architecture adopts a symmetrical circuit design and a low-frequency active bridge. The rectifier circuit (Unfolder Circuit) is composed of switching elements compared with the transformer of the same specification, so the volume and weight are smaller and the efficiency is better, and a controller can be added for other protection control, such as: overload protection, over temperature protection, monitoring, etc. Wait.

The main purpose of the present invention is to provide a transformerless AC-to-AC conversion circuit, which solves the problem of large transformer volume. When the AC-to-AC converter market starts to grow rapidly in the future, it will help to obtain market opportunities and promote application. And improve the conversion efficiency, and the present invention only has a high-frequency switching power stage, which can improve its conversion efficiency and simplify its control circuit complexity, and reduce the EMI environmental interference generated by the transformer, and the present invention does not use a transformer for AC voltage Conversion can reduce EMI problems caused by transformers.

For the purpose of the above disclosure, the present invention provides a transformerless AC to AC conversion circuit, including: an input stage, including: a first switch, a control terminal of the first switch is electrically coupled to a control signal, so A first terminal of the first switch is electrically coupled to a first node, a second terminal of the first switch is electrically coupled to an input signal; a second switch, a control terminal of the second switch Is electrically coupled to the control signal, a first terminal of the second switch is electrically coupled to the input signal, and a second terminal of the second switch is electrically coupled to a second node; a third Switch, a control terminal of the third switch is electrically coupled to the control signal, a first terminal of the third switch is electrically coupled to the first node, and a second terminal of the third switch Electrically coupled to the input signal; and a fourth switch, a control terminal of the fourth switch is electrically coupled to the control signal, and a first terminal of the fourth switch is electrically coupled to the input Signal, a second terminal of the fourth switch is electrically coupled to the second node.

The transformerless AC-to-AC conversion circuit of the present invention further includes: a charging arm, including: a fifth switch, a control terminal of the fifth switch is electrically coupled to the control signal, the fifth switch A first terminal of the fifth switch is electrically coupled to a third node, a second terminal of the fifth switch is electrically coupled to the first node; and a sixth switch, a control terminal of the sixth switch is electrically coupled Is electrically coupled to the control signal, a first terminal of the sixth switch is electrically coupled to a fourth node, and a second terminal of the sixth switch is electrically coupled to the third node.

The transformerless AC-to-AC conversion circuit of the present invention further includes: a charging arm, including: a seventh switch, a control terminal of the seventh switch is electrically coupled to the control signal, and the seventh switch A first terminal of the seventh switch is electrically coupled to the first node, and a second terminal of the seventh switch is electrically coupled to a fifth node.

The transformerless AC-to-AC conversion circuit of the present invention further includes: a charging arm, including: an eighth switch, a control terminal of the eighth switch is electrically coupled to the control signal, and the first A first terminal of the eight switch is electrically coupled to the fifth node, and a second terminal of the eighth switch is electrically coupled to the second node.

The transformerless AC-to-AC conversion circuit of the present invention further includes a first capacitor unit, one end of the first capacitor unit is electrically coupled to the third node, and the other end of the first capacitor unit is electrically connected Coupled to the fifth node.

The transformerless AC-to-AC conversion circuit of the present invention further includes: an output stage, including: a ninth switch, a control terminal of the ninth switch is electrically coupled to the control signal, and the ninth switch A first terminal of the ninth switch is electrically coupled to the fourth node, and a second terminal of the ninth switch is electrically coupled to a sixth node.

The transformerless AC-to-AC conversion circuit of the present invention further includes: an output stage, including: a tenth switch, a control terminal of the tenth switch is electrically coupled to the control signal, and the tenth switch A first terminal of the tenth switch is electrically coupled to the sixth node, and a second terminal of the tenth switch is electrically coupled to the second node.

The transformerless AC-to-AC conversion circuit of the present invention further includes: an output stage, including: an eleventh switch, a control terminal of the eleventh switch is electrically coupled to the control signal, and the first A first terminal of the eleventh switch is electrically coupled to the fourth node, and a second terminal of the eleventh switch is electrically coupled to a seventh node.

The transformerless AC-to-AC conversion circuit of the present invention further includes: an output stage, including: a twelfth switch, a control terminal of the twelfth switch is electrically coupled to the control signal, and the first A first terminal of the twelfth switch is electrically coupled to the seventh node, and a second terminal of the twelfth switch is electrically coupled to the second node.

The present invention provides a transformerless AC-to-AC conversion circuit, including: an input stage, including: a first switch, a control terminal of the first switch is electrically coupled to a control signal, one of the first switch A first terminal is electrically coupled to a first node, a second terminal of the first switch is electrically coupled to an input signal; a second switch, a control terminal of the second switch is electrically coupled to the Control signal, a first terminal of the second switch is electrically coupled to the input signal, a second terminal of the second switch is electrically coupled to a second node; a third switch, the third A control terminal of the switch is electrically coupled to the control signal, a first terminal of the third switch is electrically coupled to the first node, and a second terminal of the third switch is electrically coupled to the Input signal; and a fourth switch, a control terminal of the fourth switch is electrically coupled to the control signal, a first terminal of the fourth switch is electrically coupled to the input signal, the fourth switch A second terminal of the switch is electrically coupled to the second node; a charging arm includes: a fifth switch, a control terminal of the fifth switch is electrically coupled to the control signal, the fifth switch A first terminal of the fifth switch is electrically coupled to a third node, a second terminal of the fifth switch is electrically coupled to the first node; a sixth switch, a control terminal of the sixth switch is electrically coupled Coupled to the control signal, a first terminal of the sixth switch is electrically coupled to a fourth node, a second terminal of the sixth switch is electrically coupled to the third node; a seventh switch , A control terminal of the seventh switch is electrically coupled to the control signal, a first terminal of the seventh switch is electrically coupled to the first node, and a second terminal of the seventh switch is electrically coupled Sexual Coupling-Section 5 Point; an eighth switch, a control terminal of the eighth switch is electrically coupled to the control signal, a first terminal of the eighth switch is electrically coupled to the fifth node, the eighth switch A second end of the first capacitor unit is electrically coupled to the second node; and a first capacitor unit, one end of the first capacitor unit is electrically coupled to the third node, and the other end of the first capacitor unit is electrically coupled Is electrically coupled to the fifth node; an output stage includes: a ninth switch, a control terminal of the ninth switch is electrically coupled to the control signal, and a first terminal of the ninth switch is electrically coupled Coupled to the fourth node, a second terminal of the ninth switch is electrically coupled to a sixth node; a tenth switch, a control terminal of the tenth switch is electrically coupled to the control signal, A first terminal of the tenth switch is electrically coupled to the sixth node, and a second terminal of the tenth switch is electrically coupled to the second node; an eleventh switch, the tenth A control terminal of a switch is electrically coupled to the control signal, a first terminal of the eleventh switch is electrically coupled to the fourth node, and a second terminal of the eleventh switch is electrically coupled Connected to a seventh node; a twelfth switch, a control terminal of the twelfth switch is electrically coupled to the control signal, and a first terminal of the twelfth switch is electrically coupled to the seventh Node, a second end of the twelfth switch is electrically coupled to the second node; a second capacitor unit, one end of the second capacitor unit is electrically coupled to the sixth node, and the first The other ends of two capacitor units are electrically coupled to the seventh node; and a resistance unit, one end of the resistance unit is electrically coupled to the sixth node, and the other end of the resistance unit is electrically coupled to the Seventh node.

The main function of the present invention is to modulate the voltage with a half-wave sine width after boosting to generate a high-frequency voltage pulse, which is then converted into a form of low-frequency AC voltage through an input stage and an output stage. Other embodiments have several functions: 1. .Using switched capacitor technology for AC-to-AC conversion: to improve the large volume and heavier weight of low-frequency transformers using electromagnetic conversion. 2. Increase voltage conversion efficiency: AC-to-AC conversion is carried out by power electronic technology. The basic concept is still through three-time voltage conversion such as AC-to-DC, DC-to-DC, and DC-to-AC. The present invention only uses single-stage high-frequency power conversion. The overall efficiency can be improved. 3. Reduce circuit cost: The present invention only uses fixed on-period control, which is simple to control and low in cost. If the development cost can be effectively controlled, the opportunity for future commercialization Will be higher. 4. High circuit reliability: Compared with power electronic technology for AC to AC conversion, the present invention only uses single-stage high-frequency power conversion and fixed conduction period control, which simplifies the control system architecture and improves circuit reliability. In addition, the use of electrolytic capacitors in the circuit can be reduced, and the reliability and service life of the invention can be enhanced.

In order to have a more detailed understanding of the purpose, efficacy, features, and structure of the present invention, preferred embodiments are described below in conjunction with the drawings.

1: Transformerless AC to AC conversion circuit

T1: First switch

1a: One control terminal of the first switch

1b: a first end of the first switch

1c: a second end of the first switch

T2: second switch

2a: One control terminal of the second switch

2b: a first end of the second switch

2c: a second end of the second switch

T3: third switch

3a: One control terminal of the third switch

3b: a first end of the third switch

3c: a second end of the third switch

T4: Fourth switch

4a: One control terminal of the fourth switch

4b: a first end of the fourth switch

4c: a second end of the fourth switch

T5: Fifth switch

5a: One control terminal of the fifth switch

5b: A first end of the fifth switch

5c: A second end of the fifth switch

T6: The sixth switch

6a: One control terminal of the sixth switch

6b: A first end of the sixth switch

6c: A second end of the sixth switch

T7: Seventh switch

7a: One control terminal of the seventh switch

7b: a first end of the seventh switch

7c: a second end of the seventh switch

T8: Eighth switch

8a: One control terminal of the eighth switch

8b: a first end of the eighth switch

8c: a second end of the eighth switch

T9: Ninth switch

9a: One control terminal of the ninth switch

9b: A first end of the ninth switch

9c: A second end of the ninth switch

T10: Tenth switch

10a: One control terminal of the tenth switch

10b: a first end of the tenth switch

10c: A second end of the tenth switch

T11: The eleventh switch

11a: One control terminal of the eleventh switch

11b: The first terminal of the eleventh switch

11c: A second end of the eleventh switch

T12: Twelfth switch

12a: One control terminal of the twelfth switch

12b: a first end of the twelfth switch

12c: a second end of the twelfth switch

Input: Input signal

CT: Control signal

210: The first capacitor unit

220: second capacitor unit

230: resistance unit

P1(n): the first node

P2(n): second node

P3(n): third node

P4(n): the fourth node

P5(n): fifth node

P6(n): sixth node

P7(n): seventh node

Figure 1: A schematic diagram of a transformerless AC-to-AC conversion circuit according to an embodiment of the present invention.

FIG. 1 is a schematic diagram of a transformerless AC to AC conversion circuit according to an embodiment of the present invention. Please refer to Figure 1, a transformerless AC to AC conversion circuit 1, including: an input stage, including: a first switch T1, a control terminal 1a of the first switch T1 is electrically coupled to a control signal CT, A first terminal 1b of the first switch T1 is electrically coupled to a first node P1(n), a second terminal 1c of the first switch T1 is electrically coupled to an input signal Input; a second switch T2, a control terminal 2a of the second switch T2 is electrically coupled to the control signal CT, a first terminal 2b of the second switch T2 is electrically coupled to the input signal Input, and the second switch A second terminal 2c of T2 is electrically coupled to a second node P2(n); a third switch T3, a control terminal 3a of the third switch T3 is electrically coupled to the control signal CT, and the first A first terminal 3b of the three switch T3 is electrically coupled to the first node P1(n), a second terminal 3c of the third switch T3 is electrically coupled to the input signal Input; and a fourth switch T4, a control terminal 4a of the fourth switch T4 is electrically coupled to the control signal CT, a first terminal 4b of the fourth switch T4 is electrically coupled to the input signal Input, and the fourth switch A second terminal 4c of T4 is electrically coupled to the second node P2(n).

Please refer to Figure 1, further comprising: a charging arm, including: a fifth switch T5, a control terminal 5a of the fifth switch T5 is electrically coupled to the control signal CT, a The first terminal 5b is electrically coupled to a third node P3(n), a second terminal 5c of the fifth switch T5 is electrically coupled to the first node P1(n); a sixth switch T6, so A control terminal 6a of the sixth switch T6 is electrically coupled to the control signal CT, a first terminal 6b of the sixth switch T6 is electrically coupled to a fourth node P4(n), the sixth switch A second terminal 6c of T6 is electrically coupled to the third node P3(n); a seventh switch T7, a control terminal 7a of the seventh switch T7 is electrically coupled to the control signal CT, the A first terminal 7b of the seventh switch T7 is electrically coupled to the first node P1(n), and a second terminal 7c of the seventh switch T7 is electrically coupled to a fifth node P5(n); and An eighth switch T8, a control terminal 8a of the eighth switch T8 is electrically coupled to the control signal CT, and a first terminal 8b of the eighth switch T8 is electrically coupled to the fifth node P5 ( n), a second terminal 8c of the eighth switch T8 is electrically coupled to the second node P2(n); the number of switches of one charging arm can be superimposed, and is not limited to the number of switches in one column.

Please refer to FIG. 1, further comprising: a first capacitor unit 210, one end of the first capacitor unit 210 is electrically coupled to the third node P3(n), and the other end of the first capacitor unit 210 is electrically connected to the third node P3(n). Sexually coupled to the fifth node P5(n).

Please refer to FIG. 1, an output stage including: a ninth switch T9, a control terminal 9a of the ninth switch T9 is electrically coupled to the control signal CT, and a first terminal of the ninth switch T9 9b is electrically coupled to the fourth node P4(n), a second terminal 9c of the ninth switch T9 is electrically coupled to a sixth node P6(n); a tenth switch T10, the tenth A control terminal 10a of the switch T10 is electrically coupled to the control signal CT, and a first terminal 10b of the tenth switch T10 is electrically coupled to the sixth node P6(n). A second terminal 10c is electrically coupled to the second node P2(n); an eleventh switch T11, a control terminal 11a of the eleventh switch T11 is electrically coupled to the control signal CT, the A first terminal 11b of the eleventh switch T11 is electrically coupled to the fourth node P4(n), and a second terminal 11c of the eleventh switch T11 is electrically coupled to a seventh node P4(n). Node P7(n); a twelfth switch T12, a control terminal 12a of the twelfth switch T12 is electrically coupled to the control signal CT, a first terminal 12b of the twelfth switch T12 is electrically Is coupled to the seventh node P7(n), a second terminal 112c of the twelfth switch T12 is electrically coupled to the second node P2(n); a second capacitor unit 220, the second One end of the capacitor unit 220 is electrically coupled to the sixth node P6(n), the other end of the second capacitor unit 220 is electrically coupled to the seventh node P7(n); and a resistance unit 230, so One end of the resistance unit 230 is electrically coupled to the sixth node P6(n), and the other end of the resistance unit 230 is electrically coupled to the seventh node P7(n).

Please refer to Figure 1, a transformerless AC to AC conversion circuit 1, including: an input stage, including: a first switch T1, a control terminal 1a of the first switch T1 is electrically coupled to a control signal CT, A first terminal 1b of the first switch T1 is electrically coupled to a first node P1(n), a second terminal 1c of the first switch T1 is electrically coupled to an input signal Input; a second switch T2, a control terminal 2a of the second switch T2 is electrically coupled to the control signal CT, a first terminal 2b of the second switch T2 is electrically coupled to the input signal Input, and the second switch A second terminal 2c of T2 is electrically coupled to a second node P2(n); a third switch T3, a control terminal 3a of the third switch T3 is electrically coupled to the control signal CT, and the first A first terminal 3b of the three switch T3 is electrically coupled to the first node P1(n), a second terminal 3c of the third switch T3 is electrically coupled to the input signal Input; and a fourth switch T4, a control terminal 4a of the fourth switch T4 is electrically coupled to the control signal CT, a first terminal 4b of the fourth switch T4 is electrically coupled to the input signal Input, and the fourth switch A second terminal 4c of T4 is electrically coupled to the second node P2(n); a charging arm includes: a fifth switch T5, and a control terminal 5a of the fifth switch T5 is electrically coupled to the For the control signal CT, a first terminal 5b of the fifth switch T5 is electrically coupled to a third node P3(n), and a second terminal 5c of the fifth switch T5 is electrically coupled to the first node P1(n); a sixth switch T6, a control terminal 6a of the sixth switch T6 is electrically coupled to the control signal CT, and a first terminal 6b of the sixth switch T6 is electrically coupled to a first Four nodes P4(n), a second terminal 6c of the sixth switch T6 is electrically coupled to the third node P3(n); a seventh switch T7, a control terminal 7a of the seventh switch T7 is electrically coupled to the control signal CT, a first terminal 7b of the seventh switch T7 is electrically coupled to the first node P1(n), so A second terminal 7c of the seventh switch T7 is electrically coupled to a fifth node P5(n); and an eighth switch T8, and a control terminal 8a of the eighth switch T8 is electrically coupled to the control signal CT, a first terminal 8b of the eighth switch T8 is electrically coupled to the fifth node P5(n), and a second terminal 8c of the eighth switch T8 is electrically coupled to the second node P2 (n); The number of switches in one of the charging arms can be superimposed, and is not limited to the number of switches in a column; a first capacitor unit 210, one end of the first capacitor unit 210 is electrically coupled to the third node P3(n) , The other end of the first capacitor unit 210 is electrically coupled to the fifth node P5(n); an output stage includes: a ninth switch T9, and a control terminal 9a of the ninth switch T9 is electrically connected Coupled to the control signal CT, a first terminal 9b of the ninth switch T9 is electrically coupled to the fourth node P4(n), and a second terminal 9c of the ninth switch T9 is electrically coupled to A sixth node P6(n); a tenth switch T10, a control terminal 10a of the tenth switch T10 is electrically coupled to the control signal CT, and a first terminal 10b of the tenth switch T10 is electrically Is coupled to the sixth node P6(n), a second terminal 10c of the tenth switch T10 is electrically coupled to the second node P2(n); an eleventh switch T11, the eleventh A control terminal 11a of the switch T11 is electrically coupled to the control signal CT, a first terminal 11b of the eleventh switch T11 is electrically coupled to the fourth node P4(n), and the eleventh switch A second terminal 11c of T11 is electrically coupled to a seventh node P7(n); a twelfth switch T12, and a control terminal 12a of the twelfth switch T12 is electrically coupled to the control signal CT, so A first terminal 12b of the twelfth switch T12 is electrically coupled to the seventh node P7(n), and a second terminal 112c of the twelfth switch T12 is electrically coupled to the second node P2( n); a second capacitor unit 220, one end of the second capacitor unit 220 is electrically coupled to the sixth node P6(n), and the other end of the second capacitor unit 220 is electrically coupled to the first Seven nodes P7(n); and a resistance unit 230. One end of the resistance unit 230 is electrically coupled to the sixth node P6(n), and the other end of the resistance unit 230 is electrically coupled to the seventh node P6(n). Node P7(n).

Please refer to Figure 1, a transformerless AC to AC conversion circuit 1, input Both the stage and the output stage are composed of 4 switches and 1 output capacitor. When the AC voltage is a positive half cycle, the diagonal switch is turned on, and the other set of diagonal switches is off. On the contrary, when the mains voltage is a negative half cycle, the action is the opposite. The switching frequency of the switches in the circuit is the same as the frequency of the mains and is zero voltage switching Compared with the high frequency switch of the general converter, the switching loss is very small or even negligible; the middle charging arm is composed of 4 switch switches and a bridge capacitor, and its main function is to boost the voltage to a half-wave sine width Modulation generates a high-frequency voltage pulse, which is converted into a low-frequency AC voltage form through the input stage and output stage.

In summary, the present invention has several effects as follows: 1. Using switched capacitor technology for AC-to-AC conversion: to improve the problem of large volume and heavier weight of low-frequency transformers using electromagnetic conversion. 2. Increase voltage conversion efficiency: AC-to-AC conversion is carried out by power electronic technology. The basic concept is still through three-time voltage conversion such as AC-to-DC, DC-to-DC, and DC-to-AC. The present invention only uses single-stage high-frequency power conversion. The overall efficiency can be improved. 3. Reduce circuit cost: The present invention only uses fixed on-period control, which is simple to control and low in cost. If the development cost can be effectively controlled, the chances of future commercialization will also be higher. 4. High circuit reliability: Compared with power electronic technology for AC to AC conversion, the present invention only uses single-stage high-frequency power conversion and fixed conduction period control, which simplifies the control system architecture and improves circuit reliability. In addition, the use of electrolytic capacitors in the circuit can be reduced, and the reliability and service life of the invention can be enhanced.

Therefore, the present invention has excellent advancement and practicability among similar products. At the same time, after searching through domestic and foreign technical materials and documents about this kind, it is indeed not found that the same or similar structure or technology exists before the application of this case. Therefore, This case should have met the patent requirements of "inventiveness", "applicability for industrial use" and "progressiveness", and an application was filed in accordance with the law.

However, the above-mentioned are only the preferred embodiments of the present invention, and any other equivalent structural changes made by applying the specification of the present invention and the scope of the patent application should be included in the scope of the patent application of the present invention.

1: Transformerless AC to AC conversion circuit

T1: First switch

1a: One control terminal of the first switch

1b: a first end of the first switch

1c: a second end of the first switch

T2: second switch

2a: One control terminal of the second switch

2b: a first end of the second switch

2c: a second end of the second switch

T3: third switch

3a: One control terminal of the third switch

3b: a first end of the third switch

3c: a second end of the third switch

T4: Fourth switch

4a: One control terminal of the fourth switch

4b: a first end of the fourth switch

4c: a second end of the fourth switch

T5: Fifth switch

5a: One control terminal of the fifth switch

5b: A first end of the fifth switch

5c: A second end of the fifth switch

T6: The sixth switch

6a: One control terminal of the sixth switch

6b: A first end of the sixth switch

6c: A second end of the sixth switch

T7: Seventh switch

7a: One control terminal of the seventh switch

7b: a first end of the seventh switch

7c: a second end of the seventh switch

T8: Eighth switch

8a: One control terminal of the eighth switch

8b: a first end of the eighth switch

8c: a second end of the eighth switch

T9: Ninth switch

9a: One control terminal of the ninth switch

9b: A first end of the ninth switch

9c: A second end of the ninth switch

T10: Tenth switch

10a: One control terminal of the tenth switch

10b: a first end of the tenth switch

10c: A second end of the tenth switch

T11: The eleventh switch

11a: One control terminal of the eleventh switch

11b: The first terminal of the eleventh switch

11c: A second end of the eleventh switch

T12: Twelfth switch

12a: One control terminal of the twelfth switch

12b: a first end of the twelfth switch

12c: a second end of the twelfth switch

Input: Input signal

CT: Control signal

210: The first capacitor unit

220: second capacitor unit

230: resistance unit

P1(n): the first node

P2(n): second node

P3(n): third node

P4(n): the fourth node

P5(n): fifth node

P6(n): sixth node

P7(n): seventh node

Claims (6)

A transformerless AC-to-AC conversion circuit includes: an input stage, including: a first switch, a control terminal of the first switch is electrically coupled to a control signal, and a first terminal of the first switch is electrically coupled Is electrically coupled to a first node, a second terminal of the first switch is electrically coupled to one end of an input signal; a second switch, a control terminal of the second switch is electrically coupled to the control signal , A first end of the second switch is electrically coupled to one end of the input signal, a second end of the second switch is electrically coupled to a second node; a third switch, the third A control terminal of the switch is electrically coupled to the control signal, a first terminal of the third switch is electrically coupled to the first node, and a second terminal of the third switch is electrically coupled to the The other end of the input signal; and a fourth switch, a control end of the fourth switch is electrically coupled to the control signal, and a first end of the fourth switch is electrically coupled to the other end of the input signal At one end, a second end of the fourth switch is electrically coupled to the second node; a charging arm includes: a fifth switch, and a control end of the fifth switch is electrically coupled to the control signal , A first terminal of the fifth switch is electrically coupled to a third node, and a second terminal of the fifth switch is electrically coupled to the first node; a sixth switch, the sixth switch A control terminal of the sixth switch is electrically coupled to the control signal, a first terminal of the sixth switch is electrically coupled to a fourth node, and a second terminal of the sixth switch is electrically coupled to the third Node; a seventh switch, a control terminal of the seventh switch is electrically coupled to the control signal, a first terminal of the seventh switch is electrically coupled to the first node, the seventh switch A second terminal of the eighth switch is electrically coupled to a fifth node; and an eighth switch, a control terminal of the eighth switch is electrically coupled to the control Signal, a first terminal of the eighth switch is electrically coupled to the fifth node, a second terminal of the eighth switch is electrically coupled to the second node; a first capacitor unit, so One end of the first capacitor unit is electrically coupled to the third node, the other end of the first capacitor unit is electrically coupled to the fifth node; and an output stage, one end of the output stage is electrically coupled Connected to the fourth node, and the other end of the output stage is electrically coupled to the second node. According to the transformerless AC-to-AC conversion circuit described in item 1 of the scope of patent application, the output stage includes: a ninth switch, and a control terminal of the ninth switch is electrically coupled to the control signal, A first terminal of the ninth switch is electrically coupled to the fourth node, and a second terminal of the ninth switch is electrically coupled to a sixth node. The transformerless AC-to-AC conversion circuit described in item 2 of the scope of patent application, wherein the output stage includes: a tenth switch, a control terminal of the tenth switch is electrically coupled to the control signal, A first terminal of the tenth switch is electrically coupled to the sixth node, and a second terminal of the tenth switch is electrically coupled to the second node. The transformerless AC-to-AC conversion circuit described in item 3 of the scope of patent application, wherein the output stage includes: an eleventh switch, and a control terminal of the eleventh switch is electrically coupled to the control Signal, a first terminal of the eleventh switch is electrically coupled to the fourth node, and a second terminal of the eleventh switch is electrically coupled to a seventh node. The transformerless AC-to-AC conversion circuit described in item 4 of the scope of patent application, wherein the output stage includes: a twelfth switch, and a control terminal of the twelfth switch is electrically coupled to the control Signal, a first terminal of the twelfth switch is electrically coupled to the seventh node, and a second terminal of the twelfth switch is electrically coupled to the second node. A transformerless AC-to-AC conversion circuit includes: an input stage, including: a first switch, a control terminal of the first switch is electrically coupled to a control signal, and a first terminal of the first switch is electrically coupled Is electrically coupled to a first node, a second terminal of the first switch is electrically coupled to one end of an input signal; a second switch, a control terminal of the second switch is electrically coupled to the control signal , A first end of the second switch is electrically coupled to one end of the input signal, a second end of the second switch is electrically coupled to a second node; a third switch, the third A control terminal of the switch is electrically coupled to the control signal, a first terminal of the third switch is electrically coupled to the first node, and a second terminal of the third switch is electrically coupled to the The other end of the input signal; and a fourth switch, a control end of the fourth switch is electrically coupled to the control signal, and a first end of the fourth switch is electrically coupled to the other end of the input signal At one end, a second end of the fourth switch is electrically coupled to the second node; a charging arm includes: a fifth switch, and a control end of the fifth switch is electrically coupled to the control signal , A first terminal of the fifth switch is electrically coupled to a third node, and a second terminal of the fifth switch is electrically coupled to the first node; a sixth switch, the sixth switch A control terminal of the sixth switch is electrically coupled to the control signal, a first terminal of the sixth switch is electrically coupled to a fourth node, and a second terminal of the sixth switch is electrically coupled to the third Node; a seventh switch, a control terminal of the seventh switch is electrically coupled to the control signal, the A first terminal of the seventh switch is electrically coupled to the first node, and a second terminal of the seventh switch is electrically coupled to a fifth node; an eighth switch, a control of the eighth switch A terminal electrically coupled to the control signal, a first terminal of the eighth switch is electrically coupled to the fifth node, and a second terminal of the eighth switch is electrically coupled to the second node; And a first capacitor unit, one end of the first capacitor unit is electrically coupled to the third node, and the other end of the first capacitor unit is electrically coupled to the fifth node; an output stage including: A ninth switch, a control terminal of the ninth switch is electrically coupled to the control signal, a first terminal of the ninth switch is electrically coupled to the fourth node, and a control terminal of the ninth switch is electrically coupled to the fourth node The second terminal is electrically coupled to a sixth node; a tenth switch, a control terminal of the tenth switch is electrically coupled to the control signal, and a first terminal of the tenth switch is electrically coupled to all The sixth node, a second terminal of the tenth switch is electrically coupled to the second node; an eleventh switch, a control terminal of the eleventh switch is electrically coupled to the control signal, A first terminal of the eleventh switch is electrically coupled to the fourth node, a second terminal of the eleventh switch is electrically coupled to a seventh node; a twelfth switch, the fourth node A control terminal of the twelfth switch is electrically coupled to the control signal, a first terminal of the twelfth switch is electrically coupled to the seventh node, and a second terminal of the twelfth switch is electrically coupled Coupled to the second node; a second capacitor unit, one end of the second capacitor unit is electrically coupled to the sixth node, and the other end of the second capacitor unit is electrically coupled to the seventh node ;as well as A resistance unit, one end of the resistance unit is electrically coupled to the sixth node, and the other end of the resistance unit is electrically coupled to the seventh node.

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