CN202153713U

CN202153713U - Electronic boosting power transformer

Info

Publication number: CN202153713U
Application number: CN2011203011993U
Authority: CN
Inventors: 毛承雄; 段余平; 王丹; 邱军; 黄汉奇; 刘荣; 陆继明; 赵建刚; 胡舰; 陈亮; 张锋
Original assignee: Huazhong University of Science and Technology; Wuhan Iron and Steel Group Corp
Current assignee: Huazhong University of Science and Technology; Wuhan Iron and Steel Group Corp
Priority date: 2011-08-18
Filing date: 2011-08-18
Publication date: 2012-02-29
Anticipated expiration: 2021-08-18

Abstract

The utility model discloses an electronic boosting power transformer, comprising a rectification circuit, an inverter circuit, a control portion of the inverter circuit and a middle high frequency transformer, wherein the rectification circuit is a single phase full bridge rectification circuit, the output end of the single phase full bridge rectification circuit is simultaneously connected with the input ends of two sets of single phase bridge type inverter circuits, the output ends of the two sets of single phase bridge type inverter circuits are respectively connected with the primary sides of the first middle high frequency transformer T1 and the second middle high frequency transformer T2, the secondary sides of the two middle high frequency transformers are connected in series as an output end, the control portion of the inverter circuit outputs two groups of complementary control signals respectively in the positive semi-cycle and in the negative semi-cycle of the sine wave of an AC power supply, and the output end of a circuit formed by connecting the input end of the single phase full bridge rectification circuit with the secondary sides of the two middle high frequency transformers in series is connected with a filter. In the utility model, the two sets of complementary inverter circuits can generate complete sine wave at the secondary side of the transformer, and the electronic boosting power transformer enables the volume, the weight and the loss to be reduced and is low in cost and high in operation reliability.

Description

A kind of electronic type step-up power transformers

Technical field

The utility model belongs to electric and electronic technical field, particularly a kind of electronic type step-up power transformers.

Background technology

Power transformer is widely used in the various occasions of power transmission and distribution and productive life, and wherein Industrial Frequency Transformer accounts for the overwhelming majority.Traditional Industrial Frequency Transformer adopts iron core oil-immersed type usually, has simple, the reliability advantages of higher of manufacture craft.But also there are some significant disadvantages in it: volume is big, Heavy Weight, cost is high, no-load loss is higher.

Emerging electronic type power transformer function is strong, and control is flexible, and power supply electric energy quality better can better address these problems.But, because present device for high-power power electronic is withstand voltage and the restriction of through-current capability, some electronic type power transformer topological structure forms that proposed, realization link is more, and control is complicated, and cost is higher.

Summary of the invention

The purpose of the utility model is to provide a kind of electronic type step-up power transformers simple in structure, applicable to the various occasions of productive life, and has advantages such as volume is little, in light weight, with low cost, control is simple.

The technical scheme of the utility model is: the electronic type step-up power transformers of the utility model comprises control section, the medium-high frequency transformer of rectification circuit, inverter circuit, inverter circuit; It is characterized in that: said rectification circuit is the single-phase full bridge rectification circuit; The output of single-phase full bridge rectification circuit is connected with the input of two groups of single-phase bridge inverter circuits simultaneously; The output of two groups of single-phase bridge inverter circuits is received the former limit of the first medium-high frequency transformer T1 and the second medium-high frequency transformer T2 respectively, the output of the secondary series connection back conduct of the first medium-high frequency transformer T1 and the second medium-high frequency transformer T2; The control signal of the control section of said inverter circuit is exported two groups of complementary control signals respectively at AC power sinusoidal wave positive half cycle and negative half period.

Input at described single-phase full bridge rectification circuit connects the LC low-voltage filter device of being made up of first capacitor C 1 and first inductance L 1.

Output after the secondary series connection of the described first medium-high frequency transformer T1 and the second medium-high frequency transformer T2 is connected the LC hv filtering device of being made up of second capacitor C 2 and second inductance L 2.

The beneficial effect of the utility model is: all switching device of the utility model is all in low-pressure side; The cost of system is lower; Transformer adopting medium-high frequency transformer (as: operating frequency by 10kHz～100kHz (with the electronic power switch device of selecting for use the switching frequency of permission work relevant), its volume, weight and and loss all greatly reduce than Industrial Frequency Transformer.The utility model uses the electronic type step-up power transformers of topology, has broad power and electric pressure scope.This step-up transformer is that a kind of cost is lower, structure electronic type step-up power transformers simple and that realize easily applicable to the productive life various application occasions, helps applying.

Description of drawings

Fig. 1 is the electrical schematic diagram of the electronic type step-up power transformers of the utility model;

Fig. 2 is the voltage oscillogram of AC input;

Fig. 3 is the voltage oscillogram behind the rectifier bridge;

Fig. 4 is the voltage oscillogram of first inverter circuit output;

Fig. 5 is the voltage oscillogram of second inverter circuit output;

Fig. 6 is the voltage oscillogram of the first medium-high frequency transformer T1 at the alternating current negative half period;

Fig. 7 is the voltage oscillogram of the second medium-high frequency transformer T2 at the alternating current negative half period;

Fig. 8 is two output voltage waveforms after the series connection of medium-high frequency transformer secondary;

Fig. 9 is three-phase three-wire system embodiment;

Figure 10 is three-phase four-wire system embodiment;

Figure 11 is electronic type power transformer application example figure.

Embodiment

Below in conjunction with accompanying drawing and embodiment the utility model is further specified.

As shown in Figure 1; 1 is said electronic type step-up power transformers part in the frame of broken lines; Comprise the single-phase full bridge rectification circuit of forming by four diode D1, D2, D3, D4; The output of single-phase full bridge rectification circuit is connected with the input of two groups of single-phase bridge inverter circuits simultaneously, and two groups of single-phase bridge inverter circuits are complementary inverter circuits, and the first single-phase bridge inverter circuit is by switching device S ₁, S ₂, S ₃, S ₄Form, the second single-phase bridge inverter circuit is by switching device S ₅, S ₆, S ₇, S ₈Form.Switching device can adopt MOSFET, IGBT etc.

The output of two groups of inverter circuits is received the former limit of the first medium-high frequency transformer T1 and the second medium-high frequency transformer T2 respectively, the output of the secondary series connection back conduct of two medium-high frequency transformers; The control signal of the control section K of said inverter circuit is exported two groups of complementary control signals respectively at AC power sinusoidal wave positive half cycle and negative half period; Make the waveform of two groups of single-phase bridge inverter circuit outputs complementary, give load R thereby form complete sinewave output in transformer secondary series connection back.

Input at described single-phase full bridge rectification circuit connects the LC filter of being made up of first capacitor C 1 and first inductance L 1.

Output after the secondary series connection of described two medium-high frequency transformers connects the LC filter of being made up of second capacitor C 2 and second inductance L 2.

Operation principle below in conjunction with oscillogram explanation the utility model:

Fig. 2 is the oscillogram of AC input, and Fig. 3 is the oscillogram behind the rectifier bridge;

Fig. 4 is the oscillogram of first inverter circuit output, and Fig. 5 is the oscillogram of second inverter circuit output: the control method of two groups of inverter circuits is: at the positive half cycle of AC power AC, S ₄, S ₈For often opening S ₁, S ₂State and S ₅, S ₆State complementary, i.e. S ₁, S ₂State be open and close (like Fig. 4), then S ₅, S ₆State for closing, open (like Fig. 5), two waveform complementations.At this moment, the former limit at the first medium-high frequency transformer T1 and the second medium-high frequency transformer T2 is respectively the waveform of Fig. 4, Fig. 5.

Negative half period at AC power AC then changes into, S ₂, S ₆For often opening S ₃, S ₄State and S ₇, S ₈State complementary, i.e. S ₃, S ₄State be open and close (like Fig. 6), then S ₇, S ₈State for closing, open (like Fig. 7).And this moment, the waveform on the former limit of the first medium-high frequency transformer T1 and the second medium-high frequency transformer T2 then is the reverse of Fig. 4, Fig. 5 waveform, like Fig. 6, Fig. 7.

Fig. 8 is the output voltage waveform after two medium-high frequency transformer secondary series connection connect:

Because two groups of inverter circuit output voltages are complementary, the voltage waveform of two transformer secondary is also just in time complementary.Like this, the voltage with the output after two transformer secondary series connection is complete sine wave.

The control section of the inverter circuit of the utility model can generate two groups of complementary control signals respectively at AC power sinusoidal wave positive half cycle and negative half period; Make the waveform of two groups of inverter circuit outputs complementary, thereby form complete sine wave in transformer secondary series connection back.

The utility model both can be single-phase, also can single-phasely constitute three-phase three-wire system system and three-phase four-wire system by three.

Fig. 9 is three-phase three-wire system embodiment, and Figure 10 is that three-phase four-wire system embodiment: T is a transformer, only shows former limit part, empty frame part in 1 representative graph 1, the i.e. single-phase technical application scheme part of the utility model.

Give an example in the face of the utility model practical implementation down.

Figure 11 is electronic type power transformer application example figure: the sine wave by the electronic type step-up power transformers produces is supplied with microwave oven magnetic through voltage doubling rectifing circuit.

Among the figure, AC is input as single-phase 220V/50Hz, and system power is 1000W.S1～S8 chooses MOSFET as the electronic power switch device, chooses the MOSFET about 600V/20A, and switching frequency is selected 100kHz.Two transformer T1, T2 choose the medium-high frequency transformer of 100kHz, and secondary has two groups of windings, and no-load voltage ratio was respectively 220: 3.3 and 220: 2100.After two groups of secondary windings of two transformers were connected respectively, generating effective value was the complete sine wave of 3.3V and 2100V.Wherein 3.3V supplies with filament, and 2100V becomes the 4200V direct voltage and supplies with magnetron CKG through after the voltage doubling rectifing circuit.Capacitor C and diode D play respectively at a distance from direct sum afterflow effect.

The utility model is not limited to above-mentioned embodiment; Persons skilled in the art are according to the disclosed content of the utility model; Can adopt other multiple embodiment to implement the utility model, therefore, project organization of every employing the utility model and thinking; Do some simple designs that change or change, all belong to the scope of the utility model protection.

Claims

1. electronic type step-up power transformers; The control section, the medium-high frequency transformer that comprise rectification circuit, inverter circuit, inverter circuit; It is characterized in that: said rectification circuit is the single-phase full bridge rectification circuit; The output of single-phase full bridge rectification circuit is connected with the input of two groups of single-phase bridge inverter circuits simultaneously; The output of two groups of single-phase bridge inverter circuits is received the former limit of the first medium-high frequency transformer T1 and the second medium-high frequency transformer T2 respectively, the output of the secondary series connection back conduct of the first medium-high frequency transformer T1 and the second medium-high frequency transformer T2; The control signal of the control section of said inverter circuit is exported two groups of complementary control signals respectively at AC power sinusoidal wave positive half cycle and negative half period.

2. electronic type step-up power transformers according to claim 1 is characterized in that: the input at described single-phase full bridge rectification circuit connects the LC filter of being made up of first capacitor C 1 and first inductance L 1.

3. electronic type step-up power transformers according to claim 1 and 2 is characterized in that: the output after the secondary series connection of the described first medium-high frequency transformer T1 and the second medium-high frequency transformer T2 is connected the LC filter of being made up of second capacitor C 2 and second inductance L 2.