Efficient inverter with wide inversion output voltage

Abstract

The utility model relates to the technical field of inverters, and provides a high-efficiency inverter with wide inverter output voltage, which comprises a first inverter module, a transformer, a rectifier module, a switch module and a second inverter module which are connected in sequence, and a main controller connected with the first inverter module and the second inverter module, two groups of rectification of the first rectifier bridge and the second rectifier bridge are arranged based on different power utilization requirements, the switch module is arranged on the rear side, and series-parallel connection switching arrangement between the first rectifier bridge and the second rectifier bridge is achieved through connection arrangement of the switch module, the first access end, the second access end, the third access end, the first access end and the third access end. According to an actual power utilization demand, a corresponding alternating current power supply is output, a single set of inverter circuit can realize switching selection of an inverter output voltage of 120Vac or 230Vac, different demands of more customers are met, and the cost of electric equipment is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of inverters, in particular to a high-efficiency inverter with a wide inverter output voltage. Background Art

[0002] An inverter is an electronic device that converts low-voltage (12V, 24V, or 48V) DC power into 220V AC power. The inverter gets its name from the fact that 220V AC power is typically rectified to DC, and the inverter performs the opposite function. In the mobile age, the demand for mobile office, mobile communications, mobile leisure, and entertainment is growing. While on the move, people need not only low-voltage DC power supplied by batteries, but also the indispensable 220V AC power they rely on in their daily lives. Inverters can meet this need.

[0003] Existing inverters offer a single output voltage, such as 120Vac or 230Vac. Current solutions often utilize a push-pull DC-DC + H4 inverter topology. The push-pull DC-DC circuit boosts the battery voltage from 48V to a suitable high-voltage DC bus voltage, while the H4 inverter circuit converts the high-voltage DC bus voltage into an AC voltage to power the AC load. This allows the battery's stored energy to be used by the load. However, because the push-pull DC-DC switches in this solution operate in a hard-switching state, they suffer from low efficiency, high EMI, and a single inverter output voltage, making them unable to meet user power needs. Utility Model Content

[0004] The utility model provides a high-efficiency inverter with a wide inverter output voltage, which solves the technical problems that the existing inverter has a single output voltage that cannot adapt to the user's power demand, has low circuit working efficiency, and has large EMI interference.

[0005] To solve the above technical problems, the present invention provides a high-efficiency inverter with a wide inverter output voltage, comprising a first inverter module, a transformer, a rectifier module, a switch module, and a second inverter module connected in sequence, and a main controller connected to the first inverter module and the second inverter module; the switch module comprises a first input terminal to a third input terminal, and a first output terminal to a third output terminal; the rectifier module comprises a first rectifier bridge and a second rectifier bridge; one output terminal of the first rectifier bridge is connected to the first input terminal and the second inverter module, and the other output terminal is connected to the second input terminal and the third output terminal; one output terminal of the second rectifier bridge is connected to the first output terminal and the second output terminal, and the other output terminal is connected to the third input terminal and the second inverter module.

[0006] This basic solution sets up two sets of rectification, the first rectifier bridge and the second rectifier bridge, based on different power requirements, and sets a switch module on the rear side. Through its connection settings with the first input terminal to the third input terminal and the first output terminal to the third output terminal, the series-parallel switching setting between the first rectifier bridge and the second rectifier bridge is realized, and then the corresponding AC power is output according to the actual power demand. A single set of inverter circuits can realize the switching selection of the inverter output voltage of 120Vac or 230Vac, meeting the different needs of more customers and effectively reducing the cost of electrical equipment.

[0007] In a further embodiment, the switch module includes a first switch, a second switch and a third switch connected to the main controller signal; one end of the first switch is connected to an output end of the first rectifier bridge as a first access end, and the other end is connected to the second output end and an output end of the second rectifier bridge as a first output end; one end of the second switch is connected to the other output end and the third output end of the first rectifier bridge as a second access end, and the other end is connected to the first output end and an output end of the second rectifier bridge as a second output end; one end of the third switch is connected to the other output end of the second rectifier bridge and the second inverter module as a third access end, and the other end is connected to an output end of the second rectifier bridge as a third output end.

[0008] This solution sets a first switch, a second switch and a third switch connected to the main controller signal, and uses the signal switch to control the on and off of the first switch / second switch / third switch, thereby realizing the series-parallel switching setting between the first rectifier bridge and the second rectifier bridge. It has a simple structure and low cost.

[0009] In a further embodiment, the transformer includes a primary winding N1 and a secondary winding, the secondary winding includes a first secondary coil N2 and a second secondary coil N3, the primary winding N1 is connected to the output end of the first inverter module, the output end of the first secondary coil N2 is connected to the input end of the first rectifier bridge, and the output end of the second secondary coil N3 is connected to the input end of the second rectifier bridge.

[0010] In this solution, a first secondary coil N2 and a second secondary coil N3 are set in the secondary winding of the transformer, and a series-parallel switching setting is realized through a switch module, thereby realizing the series-parallel switching setting of the first secondary coil N2 and the second secondary coil N3, so as to achieve corresponding adjustment of the output voltage to meet the user's power demand.

[0011] In a further embodiment, a first resonance module is further included, which includes a first inductor L1 and a first capacitor C1; one end of the first inductor L1 is connected to the first inverter module, and the other end is connected to the transformer through the first capacitor C1.

[0012] This solution adopts a soft-switching LLC topology, which can operate at a higher operating frequency, achieve high power density and high efficiency, and lower EMI interference.

[0013] In a further embodiment, the first inverter module includes a switch tube Q1, a switch tube Q2, a switch tube Q3 and a switch tube Q4; the first end of the switch tube Q1 is connected to the positive pole of the power input, and the second end is connected to the transformer through the first resonance module; the first end of the switch tube Q2 is connected to the positive pole of the power input, and the second end is connected to the transformer; the first end of the switch tube Q3 is connected to the transformer through the first resonance module, and the second end is grounded; the first end of the switch tube Q4 is connected to the transformer, and the second end is grounded.

[0014] The first inverter module of this solution uses a switching tube. By controlling the on and off time of the power switching device, efficient power conversion can be achieved, converting direct current into alternating current. Its conversion efficiency is usually above 90%.

[0015] In a further embodiment, the first rectifier bridge includes a diode D1, a diode D2, a diode D3 and a diode D4; the positive electrode of the diode D1 is connected to one end of the first secondary coil N2, and the negative electrode is connected to the first access terminal and the second inverter module; the positive electrode of the diode D2 is connected to the other end of the first secondary coil N2, and the negative electrode is connected to the first access terminal and the second inverter module; the positive electrode of the diode D3 is connected to the second access terminal and the third output terminal, and the negative electrode is connected to one end of the first secondary coil N2; the positive electrode of the diode D4 is connected to the second access terminal and the third output terminal, and the negative electrode is connected to the other end of the first secondary coil N2.

[0016] In a further embodiment, the second rectifier bridge includes a diode D5, a diode D6, a diode D7 and a diode D8; the positive electrode of the diode D5 is connected to one end of the second secondary coil N3, and the negative electrode is connected to the first output terminal and the second output terminal; the positive electrode of the diode D6 is connected to the other end of the second secondary coil N3, and the negative electrode is connected to the first output terminal and the second output terminal; the positive electrode of the diode D7 is connected to the third input terminal and the ground pin, and the negative electrode is connected to one end of the second secondary coil N3; the positive electrode of the diode D8 is connected to the third input terminal and the ground pin, and the negative electrode is connected to the other end of the second secondary coil N3.

[0017] This solution converts AC power to DC power by installing a rectifier bridge on the secondary side of the transformer, reducing energy loss during transmission. The rectifier bridge converts AC power to smooth DC power, reducing voltage and current fluctuations and improving power supply efficiency.

[0018] In a further embodiment, a second resonance module is further included, which includes a second inductor L2 and a second capacitor C2; one end of the second inductor L2 is connected to the second inverter module, and the other end is connected to the power output end; the second capacitor C2 is connected in parallel to the power output end.

[0019] This solution connects a second resonant module to the power output. Through resonance control, it can ensure the stability of the inverter output current, reduce voltage and current fluctuations, and improve the stability and reliability of the system.

[0020] In a further embodiment, the second inverter module includes a switch tube Q5, a switch tube Q6, a switch tube Q7 and a switch tube Q8; the first end of the switch tube Q5 is connected to the rectifier module and the switch module, and the second end is connected to the power output end through the second resonance module; the first end of the switch tube Q6 is connected to the rectifier module and the switch module, and the second end is connected to the power output end; the first end of the switch tube Q7 is connected to the power output end through the second resonance module, and the second end is grounded; the first end of the switch tube Q8 is connected to the power output end, and the second end is grounded.

[0021] This solution connects a second inverter module to the secondary output of the transformer to convert DC power into AC power required by users.

[0022] In a further embodiment, a filter capacitor C3 is further included, wherein the positive electrode of the filter capacitor C3 is connected to the input end of the second inverter module, and the negative electrode is grounded.

[0023] The filter capacitor C3 of this solution can release charge when the voltage drops, thereby smoothing the output voltage and reducing the fluctuation of the output voltage, which helps to improve the stability and reliability of the power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a system framework diagram of a high-efficiency inverter with a wide inverter output voltage provided by an embodiment of the utility model;

[0025] Figure 2 The embodiment of the present utility model provides Figure 1 Part of the hardware circuit diagram;

[0026] Figure 3 The embodiment of the present utility model provides Figure 1 Part of the hardware circuit diagram;

[0027] Among them: a first inverter module 1, a first resonant module 2, a transformer T1, a rectifier module 3, a switch module 4, a second inverter module 5, a second resonant module 6, and a main controller 7. DETAILED DESCRIPTION

[0028] The following describes the implementation methods of the present invention in detail with reference to the accompanying drawings. The embodiments are provided for illustrative purposes only and are not to be construed as limiting the present invention. The accompanying drawings are provided for reference and illustration purposes only and do not constitute a limitation on the scope of patent protection of the present invention, because many changes can be made to the present invention without departing from the spirit and scope of the present invention.

[0029] The embodiment of the present invention provides a high-efficiency inverter with a wide inverter output voltage, such as Figure 1 、 Figure 2 、 Figure 3 As shown, in this embodiment, it includes a first inverter module 1, a transformer T1, a rectifier module 3, a switch module 4 and a second inverter module 5 connected in sequence, and a main controller 7 connected to the first inverter module 1 and the second inverter module 5; the switch module 4 includes a first input terminal to a third input terminal and a first output terminal to a third output terminal; the rectifier module 3 includes a first rectifier bridge and a second rectifier bridge; one output terminal of the first rectifier bridge is connected to the first input terminal and the second inverter module 5, and the other output terminal is connected to the second input terminal and the third output terminal; one output terminal of the second rectifier bridge is connected to the first output terminal and the second output terminal, and the other output terminal is connected to the third input terminal and the second inverter module 5.

[0030] The main controller 7 is a control chip in a conventional inverter, including but not limited to an MCU.

[0031] In this embodiment, the switch module 4 includes a first switch K1, a second switch K2, and a third switch K3 that are signal-connected to the main controller 7; one end of the first switch K1 is connected to an output end of the first rectifier bridge as a first access end, and the other end is connected to the second output end and an output end of the second rectifier bridge as a first output end; one end of the second switch K2 is connected to the other output end and the third output end of the first rectifier bridge as a second access end, and the other end is connected to the first output end and an output end of the second rectifier bridge as a second output end; one end of the third switch K3 is connected to the other output end of the second rectifier bridge and the second inverter module 5 as a third access end, and the other end is connected to an output end of the second rectifier bridge as a third output end.

[0032] The first switch K1 / the second switch K2 / the third switch K3 are preferably relays, which are controlled by the main controller and can also be set to other switch devices according to actual needs.

[0033] In this embodiment, a first switch K1, a second switch K2, and a third switch K3 are provided which are signal-connected to the main controller 7. The signal switch is used to control the on / off of the first switch K1 / the second switch K2 / the third switch K3, thereby realizing the series-parallel switching setting between the first rectifier bridge and the second rectifier bridge. The structure is simple and the cost is low.

[0034] In this embodiment, the transformer T1 includes a primary winding N1 and a secondary winding, the secondary winding includes a first secondary coil N2 and a second secondary coil N3, the primary winding N1 is connected to the output end of the first inverter module 1, the output end of the first secondary coil N2 is connected to the input end of the first rectifier bridge, and the output end of the second secondary coil N3 is connected to the input end of the second rectifier bridge.

[0035] In this embodiment, a first secondary coil N2 and a second secondary coil N3 are set in the secondary winding of the transformer T1, and a series-parallel switching setting is realized through the switch module 4, thereby realizing the series-parallel switching setting of the first secondary coil N2 and the second secondary coil N3, so as to achieve corresponding adjustment of the output voltage to meet the user's power demand.

[0036] In this embodiment, a first resonance module 2 is further included. The first resonance module 2 includes a first inductor L1 and a first capacitor C1. One end of the first inductor L1 is connected to the first inverter module 1, and the other end is connected to the transformer T1 through the first capacitor C1.

[0037] This embodiment adopts a soft-switching LLC topology, which can operate at a higher operating frequency, achieve high power density and high efficiency, and lower EMI interference.

[0038] In this embodiment, the first inverter module 1 includes a switch tube Q1, a switch tube Q2, a switch tube Q3 and a switch tube Q4; a first end of the switch tube Q1 is connected to the positive electrode of the power input (as shown in the attached figure); Figure 2 J1 in the figure; taking the power input as a battery input as an example, J1 and J3 are the positive and negative electrodes of the battery respectively), and the second end is connected to the transformer T1 through the first resonant module 2; the first end of the switch tube Q2 is connected to the positive electrode of the power input, and the second end is connected to the transformer T1; the first end of the switch tube Q3 is connected to the transformer T1 through the first resonant module 2, and the second end is grounded; the first end of the switch tube Q4 is connected to the transformer T1, and the second end is grounded.

[0039] The control electrodes (ie, gates) of the switch tubes Q1 , Q2 , Q3 and Q4 are all connected to the main controller and are turned on or off under the control of the main controller.

[0040] In this embodiment, the first inverter module 1 adopts a switch tube, and by controlling the on and off time of the power switch device, efficient power conversion can be achieved to convert direct current into alternating current, and its conversion efficiency is usually above 90%.

[0041] In this embodiment, the first rectifier bridge includes a diode D1, a diode D2, a diode D3 and a diode D4; the positive electrode of the diode D1 is connected to one end of the first secondary coil N2, and the negative electrode is connected to the first input terminal and the second inverter module 5; the positive electrode of the diode D2 is connected to the other end of the first secondary coil N2, and the negative electrode is connected to the first input terminal and the second inverter module 5; the positive electrode of the diode D3 is connected to the second input terminal and the third output terminal, and the negative electrode is connected to one end of the first secondary coil N2; the positive electrode of the diode D4 is connected to the second input terminal and the third output terminal, and the negative electrode is connected to the other end of the first secondary coil N2.

[0042] In this embodiment, the second rectifier bridge includes a diode D5, a diode D6, a diode D7 and a diode D8; the anode of the diode D5 is connected to one end of the second secondary coil N3, and the cathode is connected to the first output terminal and the second output terminal; the anode of the diode D6 is connected to the other end of the second secondary coil N3, and the cathode is connected to the first output terminal and the second output terminal; the anode of the diode D7 is connected to the third input terminal and the ground pin, and the cathode is connected to one end of the second secondary coil N3; the anode of the diode D8 is connected to the third input terminal and the ground pin, and the cathode is connected to the other end of the second secondary coil N3.

[0043] This embodiment converts AC power to DC power by installing a rectifier bridge on the secondary side of transformer T1, thereby reducing energy loss during transmission. The rectifier bridge converts AC power to smooth DC power, reducing voltage and current fluctuations and improving power supply efficiency.

[0044] In this embodiment, a second resonance module 6 is further included, which includes a second inductor L2 and a second capacitor C2; one end of the second inductor L2 is connected to the second inverter module 5, and the other end is connected to the power output end; the second capacitor C2 is connected in parallel to the power output end.

[0045] Among them, the power output terminal is as follows Figure 3 Middle J2 and J4.

[0046] In this embodiment, the second resonance module 6 is connected to the power output, and the stability of the inverter output current can be ensured through resonance control, the fluctuation of voltage and current can be reduced, and the stability and reliability of the system can be improved.

[0047] In this embodiment, the second inverter module 5 includes a switch tube Q5, a switch tube Q6, a switch tube Q7 and a switch tube Q8; the first end of the switch tube Q5 is connected to the rectifier module 3 and the switch module 4, and the second end is connected to the power output end through the second resonant module 6; the first end of the switch tube Q6 is connected to the rectifier module 3 and the switch module 4, and the second end is connected to the power output end; the first end of the switch tube Q7 is connected to the power output end through the second resonant module 6, and the second end is grounded; the first end of the switch tube Q8 is connected to the power output end, and the second end is grounded.

[0048] The control electrodes (ie, gates) of the switch tubes Q5 , Q6 , Q7 and Q8 are all connected to the main controller and are controlled by the main controller to be turned on or off.

[0049] In this embodiment, the secondary output of the transformer T1 is connected to the second inverter module 5 to convert the direct current into the alternating current required by the user.

[0050] In this embodiment, a filter capacitor C3 is further included. The positive electrode of the filter capacitor C3 is connected to the input end of the second inverter module 5, and the negative electrode is grounded.

[0051] The filter capacitor C3 of this embodiment can release charge when the voltage drops, thereby smoothing the output voltage and reducing fluctuations in the output voltage, which helps to improve the stability and reliability of the power supply.

[0052] In this embodiment, the switch tubes Q1 to Q8 can be N-channel MOS tubes or P-channel MOS tubes according to requirements.

[0053] Taking the battery voltage of 48V and the transformer T1 turns ratio N1:N2:N3=1:4.2:4.2 as an example, the voltage output switching principle of this embodiment is as follows:

[0054] (1) If the switch K1 is closed, the switch K2 is opened, and the switch K3 is closed by manual or automatic control (main controller 7 controls the relay), the input power is boosted by transformer T1, so that the voltage across the filter capacitor C3 is boosted to 201.6V, and then inverted by the H4 inverter circuit (i.e., the second inverter module 5) to output 120Vac (120 volt alternating current);

[0055] (2) If the switch K1 is opened, the switch K2 is closed, and the switch K3 is opened by manual or automatic control (main controller 7 controls the relay), the input power is boosted by transformer T1, so that the voltage across the filter capacitor C3 is boosted to 403.2V, and then inverted by the H4 inverter circuit (i.e., the second inverter module 5) to output 230Vac (230 volts alternating current).

[0056] The embodiment of the present invention sets two sets of rectification, the first rectifier bridge and the second rectifier bridge, based on different power requirements, and sets a switch module 4 on the rear side. Through the connection setting between the switch module 4 and the first input terminal to the third input terminal and the first output terminal to the third output terminal, the series-parallel switching setting between the first rectifier bridge and the second rectifier bridge is realized, and then the corresponding AC power is output according to the actual power demand. A single set of inverter circuits can realize the switching selection of the inverter output voltage of 120Vac or 230Vac, meeting the different needs of more customers and effectively reducing the cost of electrical equipment.

[0057] The above embodiments are preferred implementation methods of the present invention, but the implementation methods of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A high-efficiency inverter with a wide inverter output voltage, characterized by: The invention comprises a first inverter module, a transformer, a rectifier module, a switch module and a second inverter module connected in sequence, and a main controller connected to the first inverter module and the second inverter module; the switch module comprises a first input terminal to a third input terminal and a first output terminal to a third output terminal; the rectifier module comprises a first rectifier bridge and a second rectifier bridge; one output terminal of the first rectifier bridge is connected to the first input terminal and the second inverter module, and the other output terminal is connected to the second input terminal and the third output terminal; one output terminal of the second rectifier bridge is connected to the first output terminal and the second output terminal, and the other output terminal is connected to the third input terminal and the second inverter module.

2. The high-efficiency inverter with a wide inverter output voltage according to claim 1, characterized in that: The switch module includes a first switch, a second switch, and a third switch connected to the main controller signal; one end of the first switch is connected to an output end of the first rectifier bridge as a first input end, and the other end is connected to the second output end and an output end of the second rectifier bridge as a first output end; one end of the second switch is connected to the other output end and the third output end of the first rectifier bridge as a second input end, and the other end is connected to the first output end and an output end of the second rectifier bridge as a second output end; one end of the third switch is connected to the other output end of the second rectifier bridge and the second inverter module as a third input end, and the other end is connected to an output end of the second rectifier bridge as a third output end.

3. The high-efficiency inverter with a wide inverter output voltage according to claim 2, characterized in that: The transformer includes a primary winding N1 and a secondary winding, the secondary winding includes a first secondary coil N2 and a second secondary coil N3, the primary winding N1 is connected to the output end of the first inverter module, the output end of the first secondary coil N2 is connected to the input end of the first rectifier bridge, and the output end of the second secondary coil N3 is connected to the input end of the second rectifier bridge.

4. The high-efficiency inverter with a wide inverter output voltage according to claim 1, characterized in that: It also includes a first resonance module, which includes a first inductor L1 and a first capacitor C1; one end of the first inductor L1 is connected to the first inverter module, and the other end is connected to the transformer through the first capacitor C1.

5. The high-efficiency inverter with a wide inverter output voltage according to claim 4, characterized in that: The first inverter module includes a switch tube Q1, a switch tube Q2, a switch tube Q3 and a switch tube Q4; the first end of the switch tube Q1 is connected to the positive electrode of the power input, and the second end is connected to the transformer through the first resonance module; the first end of the switch tube Q2 is connected to the positive electrode of the power input, and the second end is connected to the transformer; the first end of the switch tube Q3 is connected to the transformer through the first resonance module, and the second end is grounded; the first end of the switch tube Q4 is connected to the transformer, and the second end is grounded.

6. The high-efficiency inverter with a wide inverter output voltage according to claim 3, characterized in that: The first rectifier bridge includes a diode D1, a diode D2, a diode D3 and a diode D4; the positive electrode of the diode D1 is connected to one end of the first secondary coil N2, and the negative electrode is connected to the first input terminal and the second inverter module; the positive electrode of the diode D2 is connected to the other end of the first secondary coil N2, and the negative electrode is connected to the first input terminal and the second inverter module; the positive electrode of the diode D3 is connected to the second input terminal and the third output terminal, and the negative electrode is connected to one end of the first secondary coil N2; the positive electrode of the diode D4 is connected to the second input terminal and the third output terminal, and the negative electrode is connected to the other end of the first secondary coil N2.

7. The high-efficiency inverter with a wide inverter output voltage according to claim 3, characterized in that: The second rectifier bridge includes a diode D5, a diode D6, a diode D7 and a diode D8; the positive electrode of the diode D5 is connected to one end of the second secondary coil N3, and the negative electrode is connected to the first output terminal and the second output terminal; the positive electrode of the diode D6 is connected to the other end of the second secondary coil N3, and the negative electrode is connected to the first output terminal and the second output terminal; the positive electrode of the diode D7 is connected to the third input terminal and the ground pin, and the negative electrode is connected to one end of the second secondary coil N3; the positive electrode of the diode D8 is connected to the third input terminal and the ground pin, and the negative electrode is connected to the other end of the second secondary coil N3.

8. The high-efficiency inverter with a wide inverter output voltage according to claim 4, characterized in that: It also includes a second resonance module, which includes a second inductor L2 and a second capacitor C2; one end of the second inductor L2 is connected to the second inverter module, and the other end is connected to the power output end; the second capacitor C2 is connected in parallel to the power output end.

9. The high-efficiency inverter with a wide inverter output voltage according to claim 8, characterized in that: The second inverter module includes a switch tube Q5, a switch tube Q6, a switch tube Q7 and a switch tube Q8; the first end of the switch tube Q5 is connected to the rectifier module and the switch module, and the second end is connected to the power output end through the second resonant module; the first end of the switch tube Q6 is connected to the rectifier module and the switch module, and the second end is connected to the power output end; the first end of the switch tube Q7 is connected to the power output end through the second resonant module, and the second end is grounded; the first end of the switch tube Q8 is connected to the power output end, and the second end is grounded.

10. The high-efficiency inverter with a wide inverter output voltage according to claim 8, characterized in that: It also includes a filter capacitor C3, the positive electrode of the filter capacitor C3 is connected to the input end of the second inverter module, and the negative electrode is grounded.

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