CN203377785U - Charging and discharging type DC-DC conversion circuit and new energy power generation system - Google Patents
Charging and discharging type DC-DC conversion circuit and new energy power generation system Download PDFInfo
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- CN203377785U CN203377785U CN201320419086.2U CN201320419086U CN203377785U CN 203377785 U CN203377785 U CN 203377785U CN 201320419086 U CN201320419086 U CN 201320419086U CN 203377785 U CN203377785 U CN 203377785U
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Abstract
The utility model provides a charging and discharging type DC-DC conversion circuit. When an energy storage device is charged, the alternate conduction control of a first switch tube and a second switch tube is carried out, a synchronous rectification BUCK circuit is formed by a first semiconductor switch, the first switch tube, the second switch tube, a coupled inductor L and a capacitor C2 to charge the energy storage device and supplies power to a load through the first winding of the coupled inductor L, a second semiconductor switch and a capacitor C3 which are in magnetic integration at the same time. When the energy storage device is discharged, the anode of the energy storage device outputs DC and supplies power to the load through a high step-up ratio BOOST circuit formed by the coupled inductor L, the second switch tube, the second semiconductor switch and the capacitor C3, at the same time the first switch tube and a capacitor C1 carry out active clamping on a voltage peak generated by the input end of the second switch tube, electric energy in the capacitor C1 is sent to the energy storage device as feedback to carry out charging when the voltage of the capacitor C1 reaches a preset voltage value, thus the conversion efficiency and utilization rate of DC and the power density ratio are raised, and the cost is reduced.
Description
Technical field
The utility model belongs to electric conversion field, relates in particular to a kind of charging/discharging type DC-DC change-over circuit and grid-connected power generation system.
Background technology
At present, all can be applied to the DC-DC change-over circuit in a lot of fields and provide the direct current with predeterminated voltage for load, and when needs possess the charging and discharging function simultaneously, requirement for photoelectric transformation efficiency is higher, for example, in photovoltaic generating system, due to the unsteadiness of light and the PV characteristic of photovoltaic module, it adopts solar maximum power point to follow the tracks of (MPPT, Maximum Power Point Tracking) controller carries out detecting real-time to the generating voltage of solar panels, and tracking ceiling voltage current value, and then photovoltaic generating system is charged to energy storage device with peak efficiency, yet ageing due to light, illumination is arranged daytime and night unglazed photograph, the direct current that so just need to export solar panels by day is converted to the energy storage device charging with maximum direct current conversion efficiency, also need to take maximum utilization ratio as load supplying at night.And be also like this at other field, many times all exist because the direct current conversion efficiency is low and can't realize efficient charging to energy storage device, and can't realize efficient discharge to load because utilization rate of electrical is low again, so the current also shortage of prior art can meet the DC-DC change-over circuit of these two kinds of demands to improve galvanic conversion efficiency and utilance.
The utility model content
The utility model provides a kind of charging/discharging type DC-DC change-over circuit, is intended to improve galvanic conversion efficiency and utilance.
The utility model is achieved in that a kind of charging/discharging type DC-DC change-over circuit, with controller, energy storage device and load, is connected, and described charging/discharging type DC-DC change-over circuit comprises:
The first semiconductor switch, capacitor C 1, the first switching tube, second switch pipe, coupling inductance L, capacitor C 2, the second semiconductor switch and capacitor C 3;
The input of described the first semiconductor switch connects galvanic positive pole, the first end of the output of described the first semiconductor switch and described capacitor C 1 is connected to the input of described the first switching tube altogether, the input of the output of described the first switching tube and described second switch pipe is connected to the common contact of the Same Name of Ends of the different name end of the first winding of described coupling inductance L and the second winding altogether, the different name end of the second winding of described coupling inductance L and the first end of described capacitor C 2 are connected to the anode of described energy storage device altogether, the Same Name of Ends of the first winding of described coupling inductance L connects the input of described the second semiconductor switch, the first end of the output of described the second semiconductor switch and described capacitor C 3 is connected to the positive terminal of described load altogether, the second end of described capacitor C 3 and the negative pole end of described load, the second end of described capacitor C 2, the negative terminal of described energy storage device, the second end of the output of described second switch pipe and described capacitor C 1 is connected to described galvanic negative pole altogether, the control end of the control end of described the first switching tube and described second switch pipe is connected in described controller.
The utility model also provides a kind of grid-connected power generation system that comprises above-mentioned charging/discharging type DC-DC change-over circuit.
The utility model comprises the charging/discharging type DC-DC change-over circuit of the first semiconductor switch, capacitor C 1, the first switching tube, second switch pipe, coupling inductance L, capacitor C 2, the second semiconductor switch and capacitor C 3 by employing.When energy storage device charges, by controller, the first switching tube and second switch pipe being carried out to alternate conduction control is charged to energy storage device with the buck MPPT maximum power point tracking function of synchronous rectification realizing, by the synchronous rectification BUCK circuit formed by the first semiconductor switch pipe, the first switching tube, second switch pipe, coupling inductance L and capacitor C 2, energy storage device is charged, simultaneously the first winding, the second semiconductor switch and 3 pairs of load supplyings of capacitor C of integrated coupling inductance L by magnetic, when energy storage device discharges, the positive pole output direct current of energy storage device passes through by coupling inductance L, the second switch pipe, the BOOST circuit of the high step-up ratio that the second semiconductor switch and capacitor C 3 form is load supplying, the due to voltage spikes simultaneously produced at the input of second switch pipe by the first switching tube and 1 couple of coupling inductance L of capacitor C carries out active clamp, and when the voltage of capacitor C 1 reaches the predeterminated voltage value, controlling the first switching tube and second switch pipe by controller forms electric energy that the BUCK circuit stores capacitor C 1 the second winding by coupling inductance L and feeds back to energy storage device to be charged, thereby galvanic conversion efficiency and utilance have been improved, improved power density ratio, and reduced circuit cost.
The accompanying drawing explanation
Fig. 1 is the structural representation of the charging/discharging type DC-DC change-over circuit that provides of the utility model one embodiment;
Fig. 2 is the exemplary circuit structure chart of the charging/discharging type DC-DC change-over circuit that provides of the utility model one embodiment;
Fig. 3 is the structural representation of the charging/discharging type DC-DC change-over circuit that provides of another embodiment of the utility model;
Fig. 4 is the exemplary circuit structure chart of the charging/discharging type DC-DC change-over circuit that provides of another embodiment of the utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Fig. 1 shows the structural representation of the charging/discharging type DC-DC change-over circuit that the utility model one embodiment provides, and for convenience of explanation, only shows and the utility model relevant portion, and details are as follows:
The charging/discharging type DC-DC change-over circuit 100 that the utility model embodiment provides is connected with controller 200, energy storage device 300 and load 400, and charging/discharging type DC-DC change-over circuit 100 comprises:
The first semiconductor switch 101, capacitor C 1, the first switching tube 102, second switch pipe 103, coupling inductance L, capacitor C 2, the second semiconductor switch 104 and capacitor C 3;
The positive pole of the input connection direct current DC of the first semiconductor switch 101+, the first end of the output of the first semiconductor switch 101 and capacitor C 1 is connected to the input of the first switching tube 102 altogether, the input of the output of the first switching tube 102 and second switch pipe 103 is connected to the common contact of the Same Name of Ends of the different name end of the first winding of coupling inductance L and the second winding altogether, the different name end of the second winding of coupling inductance L and the first end of capacitor C 2 be connected to altogether the anode of energy storage device 300+, the Same Name of Ends of the first winding of coupling inductance L connects the input of the second semiconductor switch 104, the first end of the output of the second semiconductor switch 104 and capacitor C 3 is connected to the positive terminal of load 400 altogether, the second end of capacitor C 3 and the negative pole end of load 400, the second end of capacitor C 2, the negative terminal of energy storage device 300-, the second end of the output of second switch pipe 103 and capacitor C 1 be connected to altogether the negative pole of direct current DC-, the control end of the control end of the first switching tube 102 and second switch pipe 103 is connected in controller 200.
When energy storage device 300 charging, 200 pairs of the first switching tubes 102 of controller and second switch pipe 103 carry out alternate conduction control, by the synchronous rectification BUCK circuit formed by the first semiconductor switch pipe 101, the first switching tube 102, second switch pipe 103, coupling inductance L and capacitor C 2, energy storage device 300 is charged, simultaneously the first winding of the coupling inductance L by possessing the magnetic integrated functionality, the second semiconductor switch 104 and 3 pairs of loads of capacitor C, 400 power supplies.
When energy storage device 300 electric discharge, it is load 400 power supplies that the anode output direct current of energy storage device 300 forms the BOOST circuit by the coupling inductance L by possessing the magnetic integrated functionality, second switch pipe, the second semiconductor switch and capacitor C 3, the due to voltage spikes simultaneously produced by the input of the first switching tube 102 and 1 pair of second switch pipe 103 of capacitor C carries out active clamp, and when the voltage of capacitor C 1 reaches the predeterminated voltage value, the electric energy in capacitor C 1 is fed back to energy storage device 300 to be charged.
In the utility model embodiment, energy storage device 300 can be specifically storage battery, the anode of the positive pole of storage battery and the corresponding energy storage device 300 of negative pole difference+and negative terminal-, controller 200 can be that solar maximum power point tracking control unit or other possess the controller of pulse fan-out capability, when controller 200 is the solar maximum power point tracking control unit, it is according to whether illumination being arranged to determine that the current time is to belong to daytime or night, and by day the time respectively the control end of the control end of output pulse signal to the first switching tube 102 and second switch pipe 103 to control the first switching tube 102 and the 103 alternate conduction work of second switch pipe to realize the BUCK circuit framework with synchronous rectification, and charged by the second winding and 2 pairs of energy storage devices 300 of capacitor C of coupling inductance L, wherein, in the first switching tube 102 conductings, when second switch pipe 103 turn-offs, direct current DC passes through by the first semiconductor switch 101, capacitor C 1, the first switching tube 102, the BUCK circuit that the second winding of coupling inductance L and capacitor C 2 form is to energy storage device 300 chargings, now the first switching tube 102 is as the rectifying tube of this BUCK circuit, and turn-off at the first switching tube 102, during 103 conducting of second switch pipe, because the different name end of the second winding of coupling inductance L can discharge electric energy, so the BUCK circuit consisted of the second winding and the capacitor C 2 of second switch pipe 103, coupling inductance L is to energy storage device 300 chargings, now second switch pipe 103 is as the continued flow tube of this BUCK circuit.As can be seen here, controlling the first switching tube 102 and the 103 alternate conduction work of second switch pipe is charged to energy storage device 300 by the buck MPPT maximum power point tracking function with synchronous rectification with realization, thereby can effectively improve galvanic conversion efficiency, be also the charge efficiency improved energy storage device 300.In addition, in the process of above-mentioned the first switching tube 102 and the 103 alternate conduction work of second switch pipe, direct current also can be powered by its first winding, the second semiconductor switch 104 and 3 pairs of loads 400 of capacitor C with the integrated magnetic effect by coupling inductance L simultaneously.And when energy storage device 300 needs electric discharge (as night), the first switching tube 102 turn-offs, and second switch pipe 103 is realized break-make according to certain duty ratio, energy storage device 300 can pass through by coupling inductance L by the release direct current, second switch pipe 103, the boost type BOOST circuit that the second semiconductor switch 104 and capacitor C 3 forms is usingd high step-up ratio, and to load 400 electric discharges, (now second switch pipe 103 is as the switching tube of this BOOST circuit, and coupling inductance L is with the work of the multiplication of voltage turn ratio), in this process, the drain electrode meeting of second switch pipe 103 produces due to voltage spikes because of the leakage inductance of coupling inductance L, the active clamp circuit (wherein second switch pipe 103 is as the active clamp pipe) now consisted of the first switching tube 102 and capacitor C 1 carries out voltage clamping and energy storage to overcome this due to voltage spikes to the input (being the Same Name of Ends of the second winding of coupling inductance L) of second switch pipe 103, and when the voltage of capacitor C 1 reaches the predeterminated voltage value, the first switching tube 102 controlled by controller 200 and second switch pipe 103 forms the BUCK circuit, and the electric energy that capacitor C 1 is stored will overcome due to voltage spikes by the first switching tube 102 time feeds back to energy storage device 300 to be charged, so just can further promote galvanic conversion efficiency.
Further, the first semiconductor switch 101 can be specifically diode, triode, metal-oxide-semiconductor, IGBT(Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) or other possess the semiconductor device of switching characteristic; As shown in Figure 2, when the first semiconductor switch 101 is diode D1, the anode of diode D1 and negative electrode are respectively input and the output of the first semiconductor switch 101; And when the first semiconductor switch 101 possesses the semiconductor device of switching characteristic for triode, metal-oxide-semiconductor, insulated gate bipolar transistor or other, the first semiconductor switch 101 also connects controller 200, and take and realize that diode characteristic determines the end utmost point and the input of the first semiconductor switch 101 and the corresponding relation of output of selected semiconductor device as purpose.
Further, the first switching tube 102 can be specifically metal-oxide-semiconductor, triode, IGBT(Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) or other possess the semiconductor device of switching characteristic; As shown in Figure 2, when the first switching tube 102 is managed Q1 for NMOS, drain electrode, source electrode and the grid of NMOS pipe Q1 are respectively input, output and the control end of the first switching tube 102; And, when the first switching tube 102 possesses the semiconductor device of switching characteristic for triode, IGBT or other, the control impuls that input input current, output output current, the control end of the first switching tube 102 of take receives controller 200 is according to the end utmost point of determining selected semiconductor device and the corresponding relation of the first switching tube 102 inputs, output and control end.
Further, second switch pipe 103 can be specifically metal-oxide-semiconductor, triode, IGBT(Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) or other possess the semiconductor device of switching characteristic; And, when second switch pipe 103 possesses the semiconductor device of switching characteristic for triode, IGBT or other, the control impuls that input input current, output output current, the control end of second switch pipe 103 of take receives controller 200 is according to the end utmost point of determining selected semiconductor device and the corresponding relation of second switch pipe 103 inputs, output and control end.
Further, the second semiconductor switch 104 can be specifically that diode, triode, metal-oxide-semiconductor or other possess the semiconductor device of switching characteristic; As shown in Figure 2, when the second semiconductor switch 104 is diode D2, the anode of diode D2 and negative electrode are respectively input and the output of the second semiconductor switch 104; And when the second semiconductor switch 104 possesses the semiconductor device of switching characteristic for triode, metal-oxide-semiconductor, insulated gate bipolar transistor or other, the second semiconductor switch 104 also connects controller 200, and take and realize that diode characteristic determines the end utmost point and the input of the second semiconductor switch 104 and the corresponding relation of output of selected semiconductor device as purpose.
The utility model one embodiment also provides a kind of grid-connected power generation system that comprises above-mentioned charging/discharging type DC-DC change-over circuit 100, and this grid-connected power generation system can be that solar power system, wind power generation system or geothermal energy electricity generation system etc. are realized the electricity generation system of electric power output to regenerative resource utilize.
The utility model one embodiment comprises the charging/discharging type DC-DC change-over circuit of the first semiconductor switch 101, capacitor C 1, the first switching tube 102, second switch pipe 103, coupling inductance L, capacitor C 2, the second semiconductor switch 104 and capacitor C 3 by employing.When energy storage device charges, carrying out alternate conduction control by 200 pairs of the first switching tubes 102 of controller and second switch pipe 103 is charged to energy storage device 300 with the buck MPPT maximum power point tracking function of synchronous rectification with realization, and by the synchronous rectification BUCK circuit formed by the first semiconductor switch pipe 101, the first switching tube 102, second switch pipe 103, coupling inductance L and capacitor C 2, energy storage device 300 is charged, pass through the first winding, the second semiconductor switch 104 and 3 pairs of load supplyings of capacitor C of the integrated coupling inductance L of magnetic simultaneously, when energy storage device 300 electric discharge, the positive pole output direct current of energy storage device 300 passes through by coupling inductance L, second switch pipe 103, the BOOST circuit of the high step-up ratio that the second semiconductor switch 104 and capacitor C 3 form is load supplying, the due to voltage spikes simultaneously produced at the input of second switch pipe 103 by the first switching tube 102 and 1 couple of coupling inductance L of capacitor C carries out active clamp, and when the voltage of capacitor C 1 reaches the predeterminated voltage value, controlling the first switching tubes 102 and second switch pipe 103 by controller 200 forms electric energy that the BUCK circuit stores capacitor C 1 the second winding by coupling inductance L and feeds back to energy storage device 300 to be charged, thereby galvanic conversion efficiency and utilance have been improved, improved power density ratio, and reduced circuit cost.
In another embodiment of the utility model, as shown in Figure 3, charging/discharging type DC-DC change-over circuit 100 also comprises the 3rd switching tube 105, the Same Name of Ends of the first winding of the input butt coupling inductance L of the 3rd switching tube 105, the output of the 3rd switching tube 105 connects the input of the second semiconductor switch 104, and the control end of the 3rd switching tube 105 is connected in controller 200.The controller 200 of take equally illustrates the operation principle of the charging/discharging type DC-DC change-over circuit 100 shown in Fig. 2 as follows as the solar maximum power point tracking control unit as example:
Whether controller 200 has illumination to determine that the current time is to belong to daytime or night for basis, and by day the time respectively the control end of the control end of output pulse signal to the first switching tube 102 and second switch pipe 103 to control the first switching tube 102 and the 103 alternate conduction work of second switch pipe to realize the BUCK circuit framework with synchronous rectification, and charged by the second winding and 2 pairs of energy storage devices 300 of capacitor C of coupling inductance L, wherein, in the first switching tube 102 conductings, when second switch pipe 103 turn-offs, direct current DC passes through by the first semiconductor switch 101, capacitor C 1, the first switching tube 102, the BUCK circuit that the second winding of coupling inductance L and capacitor C 2 form is to energy storage device 300 chargings, now the first switching tube 102 is as the rectifying tube of this BUCK circuit, and turn-off at the first switching tube 102, during 103 conducting of second switch pipe, because the different name end of the second winding of coupling inductance L can discharge electric energy, so the BUCK circuit consisted of the second winding and the capacitor C 2 of second switch pipe 103, coupling inductance L is to energy storage device 300 chargings, now second switch pipe 103 is as the continued flow tube of this BUCK circuit.As can be seen here, controlling the first switching tube 102 and the 103 alternate conduction work of second switch pipe is charged to energy storage device 300 by the buck MPPT maximum power point tracking function with synchronous rectification with realization, thereby can effectively improve galvanic conversion efficiency, be also the charge efficiency improved energy storage device 300.
If need in the process of by day energy storage device 300 being charged, be load 400 power supplies simultaneously, in the process of above-mentioned the first switching tube 102 and the 103 alternate conduction work of second switch pipe, the control end of controller 200 meeting output pulse signal to the three switching tubes 105 keeps conductings to control the 3rd switching tube 105, and direct current will be powered with its first winding of integrated magnetic effect, the 3rd switching tube 105, the second semiconductor switch 104 and 3 pairs of loads 400 of capacitor C by coupling inductance L simultaneously so.If not needing in the process of by day energy storage device 300 being charged is load 400 power supplies simultaneously, makes controller 200 control the 3rd switching tube 105 shutoffs and get final product.
When do not need load 400 power supply night, only need to control the 3rd switching tube 105 by controller 200 and keep shutoff to get final product, and in the time need to powering to load 400 night, controller 200 can be controlled the constant conducting of the 3rd switching tube 105, energy storage device 300 can pass through by coupling inductance L by the release direct current, second switch pipe 103, the 3rd switching tube 105, the boost type BOOST circuit that the second semiconductor switch 104 and capacitor C 3 forms is usingd high step-up ratio, and to load 400 electric discharges, (now second switch pipe 103 is as the switching tube of this BOOST circuit, and coupling inductance L is with the work of the multiplication of voltage turn ratio), in this process, the drain electrode meeting of second switch pipe 103 produces due to voltage spikes because of the leakage inductance of coupling inductance L, the active clamp circuit (wherein second switch pipe 103 is as the active clamp pipe) now consisted of the first switching tube 102 and capacitor C 1 carries out voltage clamping and energy storage to overcome this due to voltage spikes to the input (being the Same Name of Ends of the second winding of coupling inductance L) of second switch pipe 103, and when the voltage of capacitor C 1 reaches the predeterminated voltage value, the first switching tube 102 controlled by controller 200 and second switch pipe 103 forms the BUCK circuit, and the electric energy that capacitor C 1 is stored will overcome due to voltage spikes by the first switching tube 102 time feeds back to energy storage device 300 to be charged, so just can further promote galvanic conversion efficiency.
From the foregoing, charging/discharging type DC-DC change-over circuit 100 shown in the Fig. 3 that adds the 3rd switching tube 105 to obtain on the basis of the charging/discharging type DC-DC change-over circuit 100 shown in Fig. 1 can be by controlling the 3rd switching tube 105 break-make to meet power supply or the outage demand of user to load 400, realizing discharging and recharging in operation to seem more flexible, make control efficiency higher; In addition, the break-make of the 3rd switching tube 105 is actually to play the magnetic integrated functionality of coupling inductance L is realized to the effect that switch is controlled.
Further, the 3rd switching tube 105 can be specifically metal-oxide-semiconductor, triode, IGBT(Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) or other possess the semiconductor device of switching characteristic; As shown in Figure 4, when the 3rd switching tube 105 is managed Q3 for NMOS, drain electrode, source electrode and the grid of NMOS pipe Q3 is respectively input, output and the control end of the 3rd switching tube 105, and the first semiconductor switch 101, the first switching tube 102, second switch pipe 103 and the second semiconductor switch 104 in Fig. 4 is chosen to be respectively diode D1, NMOS pipe Q1, NMOS pipe Q2 and the diode D2 shown in Fig. 2; And, when the 3rd switching tube 105 possesses the semiconductor device of switching characteristic for triode, IGBT or other, the pulse signal that input input current, output output current, the control end of the 3rd switching tube 105 of take receives controller 200 is according to the end utmost point of determining selected semiconductor device and the corresponding relation of the 3rd switching tube 105 inputs, output and control end.
Another embodiment of the utility model also provides a kind of grid-connected power generation system that comprises above-mentioned charging/discharging type DC-DC change-over circuit 100, and this grid-connected power generation system can be that solar power system, wind power generation system or geothermal energy electricity generation system etc. are realized the electricity generation system of electric power output to regenerative resource utilize.
Another embodiment of the utility model comprises the charging/discharging type DC-DC change-over circuit of the first semiconductor switch 101, capacitor C 1, the first switching tube 102, second switch pipe 103, coupling inductance L, capacitor C 2, the second semiconductor switch 104, the 3rd switching tube 105 and capacitor C 3 by employing.When energy storage device charges, carrying out alternate conduction control by 200 pairs of the first switching tubes 102 of controller and second switch pipe 103 is charged to energy storage device 300 with the buck MPPT maximum power point tracking function of synchronous rectification with realization, and pass through by the first semiconductor switch pipe 101, the first switching tube 102, second switch pipe 103, the synchronous rectification BUCK circuit that coupling inductance L and capacitor C 2 form is charged to energy storage device 300, pass through the first winding of the integrated coupling inductance L of magnetic simultaneously, the 3rd switching tube 105, 3 pairs of load supplyings of the second semiconductor switch 104 and capacitor C, when energy storage device 300 electric discharge, the positive pole output direct current of energy storage device 300 passes through by coupling inductance L, second switch pipe 103, the 3rd switching tube 105, the BOOST circuit of the high step-up ratio that the second semiconductor switch 104 and capacitor C 3 form is load supplying, the due to voltage spikes simultaneously produced at the input of second switch pipe 103 by the first switching tube 102 and 1 couple of coupling inductance L of capacitor C carries out active clamp, and when the voltage of capacitor C 1 reaches the predeterminated voltage value, controlling the first switching tubes 102 and second switch pipe 103 by controller 200 forms electric energy that the BUCK circuit stores capacitor C 1 the second winding by coupling inductance L and feeds back to energy storage device 300 to be charged, thereby galvanic conversion efficiency and utilance have been improved, improved power density ratio, and reduced circuit cost.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (10)
1. a charging/discharging type DC-DC change-over circuit, be connected with controller, energy storage device and load, it is characterized in that, described charging/discharging type DC-DC change-over circuit comprises:
The first semiconductor switch, capacitor C 1, the first switching tube, second switch pipe, coupling inductance L, capacitor C 2, the second semiconductor switch and capacitor C 3;
The input of described the first semiconductor switch connects galvanic positive pole, the first end of the output of described the first semiconductor switch and described capacitor C 1 is connected to the input of described the first switching tube altogether, the input of the output of described the first switching tube and described second switch pipe is connected to the common contact of the Same Name of Ends of the different name end of the first winding of described coupling inductance L and the second winding altogether, the different name end of the second winding of described coupling inductance L and the first end of described capacitor C 2 are connected to the anode of described energy storage device altogether, the Same Name of Ends of the first winding of described coupling inductance L connects the input of described the second semiconductor switch, the first end of the output of described the second semiconductor switch and described capacitor C 3 is connected to the positive terminal of described load altogether, the second end of described capacitor C 3 and the negative pole end of described load, the second end of described capacitor C 2, the negative terminal of described energy storage device, the second end of the output of described second switch pipe and described capacitor C 1 is connected to described galvanic negative pole altogether, the control end of the control end of described the first switching tube and described second switch pipe is connected in described controller.
2. charging/discharging type DC-DC change-over circuit as claimed in claim 1, it is characterized in that, described charging/discharging type DC-DC change-over circuit also comprises the 3rd switching tube, the input of described the 3rd switching tube connects the Same Name of Ends of the first winding of described coupling inductance L, the output of described the 3rd switching tube connects the input of described the second semiconductor switch, and the control end of described the 3rd switching tube is connected in described controller.
3. charging/discharging type DC-DC change-over circuit as claimed in claim 1, is characterized in that, described the first semiconductor switch is diode, triode, metal-oxide-semiconductor or insulated gate bipolar transistor.
4. charging/discharging type DC-DC change-over circuit as claimed in claim 3, is characterized in that, when described the first semiconductor switch is triode, metal-oxide-semiconductor or insulated gate bipolar transistor, described the first semiconductor switch also connects described controller.
5. charging/discharging type DC-DC change-over circuit as claimed in claim 1, is characterized in that, described the second semiconductor switch is diode, triode, metal-oxide-semiconductor or insulated gate bipolar transistor.
6. charging/discharging type DC-DC change-over circuit as claimed in claim 5, is characterized in that, when described the second semiconductor switch is triode, metal-oxide-semiconductor or insulated gate bipolar transistor, described the second semiconductor switch also connects described controller.
7. charging/discharging type DC-DC change-over circuit as claimed in claim 1, is characterized in that, described the first switching tube is metal-oxide-semiconductor, triode or insulated gate bipolar transistor.
8. charging/discharging type DC-DC change-over circuit as claimed in claim 1, is characterized in that, described second switch pipe is metal-oxide-semiconductor, triode or insulated gate bipolar transistor.
9. charging/discharging type DC-DC change-over circuit as claimed in claim 2, is characterized in that, described the 3rd switching tube is metal-oxide-semiconductor, triode or insulated gate bipolar transistor.
10. a grid-connected power generation system, is characterized in that, described grid-connected power generation system comprises charging/discharging type DC-DC change-over circuit as described as claim 1 to 9 any one.
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