CN103490614A

CN103490614A - Maximum-power tracker

Info

Publication number: CN103490614A
Application number: CN201310417265.7A
Authority: CN
Inventors: 曹艳辉; 寇青
Original assignee: Jiaxing Kai Xi Electronics Co Ltd
Current assignee: Jiaxing Kai Xi Electronics Co Ltd
Priority date: 2013-09-13
Filing date: 2013-09-13
Publication date: 2014-01-01

Abstract

The invention discloses a maximum-power tracker which comprises an input end positive electrode connector, an input end negative electrode connector, an output end positive electrode connector, and an output end negative electrode connector. The maximum-power tracker further comprises an insulating DC-DC converter with an input end positive electrode, an input end negative electrode, an output end positive electrode, and an output end negative electrode. The input end positive electrode of the insulating DC-DC converter is electrically connected with the input end positive electrode connector. The input end negative electrode of the insulating DC-DC converter is electrically connected with the input end negative electrode connector. The output end positive electrode of the insulating DC-DC converter is electrically connected with the output end positive electrode connector. The output end negative electrode of the insulating DC-DC converter is electrically connected with the input end positive electrode of the insulating DC-DC converter. The output end negative electrode connector is electrically connected with the input end negative electrode connector. Due to the fact that the output end negative electrode of the insulating DC-DC converter is electrically connected with the input end positive electrode insulating DC-DC converter, a part of voltage is overlapped outside the insulating DC-DC converter, the efficiency of the whole system is made to be maximized, and voltage withstanding requirements for power and electronic elements of the converter are reduced. Consequently, cost is reduced, and the service life is prolonged.

Description

The maximal power tracing device

Technical field:

The present invention relates to a kind of power electronic device of grid-connected power generation system, particularly a kind of maximal power tracing device.

Background technology:

Development along with wind power generation and solar energy generation technology, for grid-connected needs or in order to meet the high-voltage load power supply, usually need these low tensions are become to high-tension electricity, due to wind power generation and solar power generation unstable, all the time Maximum Power Output, therefore the maximal power tracing device comes into vogue, and the maximal power tracing device is to utilize power electronic device to coordinate suitable software, makes these wind-driven generators or solar module Maximum Power Output all the time.Traditional booster type maximal power tracing device is realized by the BOOST DC converter, as shown in Figure 1, in actual applications, DC converter is the input anode a of DC-DC converter, negative pole b directly directly is connected with the both positive and negative polarity of the output of wind-driven generator or solar module, output head anode c, negative pole d also directly is connected with the input both positive and negative polarity of combining inverter or high-voltage load, this topological structure easily causes very high crest voltage and power loss, particularly in the voltage difference of input and output a lot, like this electronic devices and components requirement of withstand voltage in the maximal power tracing device is improved, the cost of maximal power tracing device will significantly improve like this, life-span also is affected naturally, and because power consumption is larger, the efficiency of maximal power tracing device is also lower.

Summary of the invention:

Technical problem to be solved by this invention is to provide a kind of novel maximal power tracing device, it comprises input anode joint A, input cathode joint B, output head anode joint C, negative pole of output end joint D, also comprise that tape input rectifies utmost point a, input cathode b and output head anode c, the isolation DC-DC converter of negative pole of output end d, the input anode a that wherein isolates the DC-DC converter is electrically connected to input anode joint A, the input cathode b of isolation DC-DC converter is electrically connected to input cathode joint B, the output head anode c of isolation DC-DC converter is electrically connected to output head anode joint C, the negative pole of output end d of wherein said isolation DC-DC converter is electrically connected to input anode a, described negative pole of output end joint D is electrically connected to input cathode joint B.

The present invention further technical characterictic is:

Described isolation DC-DC converter comprises isolating transformer, and with the first full-bridge circuit and the second full-bridge circuit that isolating transformer is electrically connected, the turn ratio of wherein said isolating transformer primary coil and secondary coil is 1 than n, and wherein n is greater than 1.

Described the second full-bridge circuit can be also half-bridge circuit or push-pull circuit.

Described the first full-bridge circuit can be also half-bridge circuit or push-pull circuit.

The invention has the beneficial effects as follows: relatively traditional booster type maximal power tracing device, maximal power tracing device of the present invention is because isolation DC-DC converter output terminal negative pole is electrically connected to input anode, negative pole of output end joint D is electrically connected to input cathode joint B and input cathode b, so a part of voltage is to be superimposed upon isolation DC-DC converter outside, do not need maximal power tracing device internal electronic device to carry this voltage, therefore the electronic devices and components requirement of withstand voltage in the maximal power tracing device is significantly reduced, the cost of maximal power tracing device will significantly reduce like this, and the life-span also can extend naturally, and such connected mode can get around isolation DC-DC converter and directly sends some energy to combining inverter or high-voltage load, the power consumption that makes to isolate the DC-DC converter is decrease also, the available horsepower of higher percent is delivered to inverter or load, the efficiency of maximal power tracing device also is improved largely thereupon like this, can make the maximizing efficiency of whole system.

The accompanying drawing explanation:

Fig. 1 is the topological structure schematic diagram of traditional maximal power tracing device;

Fig. 2 is the topological structure schematic diagram of maximal power tracing device of the present invention;

Fig. 3 is the topological structure schematic diagram of isolation DC-DC converter in one embodiment of the invention.

Embodiment:

Below in conjunction with accompanying drawing, the present invention is described further:

As shown in Figure 2, a kind of maximal power tracing device of the present invention, it comprises input anode joint A, input cathode joint B, output head anode joint C, negative pole of output end joint D, also comprise that tape input rectifies utmost point a, input cathode b and output head anode c, the isolation DC-DC converter of negative pole of output end d, the input anode a that wherein isolates the DC-DC converter is electrically connected to input anode joint A, the input cathode b of isolation DC-DC converter is electrically connected to input cathode joint B, the output head anode c of isolation DC-DC converter is electrically connected to output head anode joint C, the negative pole of output end d of wherein said isolation DC-DC converter is electrically connected to input anode a, described negative pole of output end joint D is electrically connected to input cathode joint B.

In actual applications, the input anode joint A of maximal power tracing device of the present invention, the output of input cathode joint B and wind-driven generator or solar module just, negative pole directly connects, output head anode joint C, negative pole of output end joint D also direct and input combining inverter or high-voltage load rectifies, negative pole connects, relatively traditional booster type maximal power tracing device, maximal power tracing device of the present invention is because isolation DC-DC converter output terminal negative pole is electrically connected to input anode, negative pole of output end joint D is electrically connected to input cathode joint B and input cathode b, so a part of voltage is to be superimposed upon isolation DC-DC converter outside, do not need maximal power tracing device internal electronic component to carry this voltage, therefore the electronic devices and components requirement of withstand voltage in the maximal power tracing device is significantly reduced, the cost of maximal power tracing device will significantly reduce like this, and the life-span also can extend naturally, and such connected mode can get around isolation DC-DC converter and directly sends some energy to combining inverter or high-voltage load, the power consumption that makes to isolate the DC-DC converter is decrease also, the available horsepower of higher percent is delivered to inverter or load, the efficiency of maximal power tracing device also is improved largely thereupon like this, can make the maximizing efficiency of whole system.

Fig. 3 is the topological structure schematic diagram of isolation DC-DC converter in one embodiment of the invention, in the present embodiment, described isolation DC-DC converter comprises isolating transformer 1, the first full-bridge circuit 2 and the second full-bridge circuit 3 that are electrically connected with isolating transformer 1, wherein the primary coil of the first full-bridge circuit 2 and transformer is electrically connected to and forms closed-loop path, the secondary coil 102 of the second full-bridge circuit 3 and transformer is electrically connected to and forms closed-loop path, the turn ratio of described isolating transformer primary coil and secondary coil is 1:2 in the present embodiment, certainly when practical application, can as required the turn ratio of isolating transformer primary coil and secondary coil be set as to 1:3, 1:4, 1:5, 1:20, 1:30, 1:50, 1:70 or 1:90.

Fig. 3 is only the topological structure schematic diagram of isolation DC-DC converter in one embodiment of the invention, isolation DC-DC converter topology structure in maximal power tracing device of the present invention can also have a variety of, for example, on basis embodiment illustrated in fig. 3, when the first full-bridge circuit, when constant, described the second full-bridge circuit can be transformed to half-bridge circuit or push-pull circuit; When the second full-bridge circuit, when constant, described the first full-bridge circuit can be transformed to half-bridge circuit or push-pull circuit; And first full-bridge circuit while being transformed to half-bridge circuit or push-pull circuit, the second full-bridge circuit also can be transformed to half-bridge circuit or push-pull circuit.

Although the present invention has described several embodiments herein, coverage of the present invention is not limited to this.On the contrary, the present invention is contained all on literal or all technical schemes that fall in fact within the scope of the claims under the instruction in equivalents, as used soft switch technique ZVS and ZCS in circuit.Protection scope of the present invention is as the criterion with claims.

Claims

1. a maximal power tracing device, it comprises input anode joint A, input cathode joint B, output head anode joint C, negative pole of output end joint D, also comprise that tape input rectifies utmost point a, input cathode b and output head anode c, the isolation DC-DC converter of negative pole of output end d, the input anode a that wherein isolates the DC-DC converter is electrically connected to input anode joint A, the input cathode b of isolation DC-DC converter is electrically connected to input cathode joint B, the output head anode c of isolation DC-DC converter is electrically connected to output head anode joint C, it is characterized in that: the negative pole of output end d of described isolation DC-DC converter is electrically connected to input anode a, described negative pole of output end joint D is electrically connected to input cathode joint B.

2. maximal power tracing device as claimed in claim 1, it is characterized in that: described isolation DC-DC converter also comprises isolating transformer, the first full-bridge circuit be electrically connected to the isolating transformer primary coil, and the second full-bridge circuit be electrically connected to the isolating transformer secondary coil, the turn ratio of wherein said isolating transformer primary coil and secondary coil is 1 than n, and wherein n is greater than 1.

3. maximal power tracing device as claimed in claim 2, it is characterized in that: described the second full-bridge circuit is half-bridge circuit or push-pull circuit.

4. maximal power tracing device as described as right claim 2 or 3, it is characterized in that: described the first full-bridge circuit is half-bridge circuit or push-pull circuit.