CN109347465A - Switch tube driving circuit, switching off device and distributed generation system - Google Patents
Switch tube driving circuit, switching off device and distributed generation system Download PDFInfo
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- CN109347465A CN109347465A CN201811268033.9A CN201811268033A CN109347465A CN 109347465 A CN109347465 A CN 109347465A CN 201811268033 A CN201811268033 A CN 201811268033A CN 109347465 A CN109347465 A CN 109347465A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
This application discloses switch tube driving circuit, switching off device and distributed generation system, to be suitable for first switch tube and the controller not occasion on ground altogether.First switch tube is connected on the anode of the first DC power supply.The switch tube driving circuit includes DC/DC converter, enabled circuit, first diode, first capacitor and second circuit, in which: the input terminal of DC/DC converter connects the second DC power supply；The anode of first diode connects the anode of the first DC power supply, and the first end of the cathode connection first capacitor of first diode forms the first tie point；One end of HF switch pipe inside the second end connection DC/DC converter of first capacitor；The input terminal of second circuit connects the first tie point, driving pin of the output end of second circuit by enabled circuit connection to first switch tube；The electric signal of first tie point for being converted into stable output voltage by second circuit；Controller controls switching on and off for enabled circuit by hair pulse signal.
Description
Technical field
The present invention relates to power electronics fields, more specifically to switch tube driving circuit, switching off device and distribution
Formula electricity generation system.
Background technique
Switch tube driving circuit is the interface circuit between switching tube and controller, and effect is the arteries and veins for exporting controller
It rushes signal and is converted to the signal for capableing of driving switch pipe turn-on and turn-off.In some cases, switching tube and controller are untotal
Ground, at this time with regard to needing to provide a kind of switch tube driving circuit that can be suitable under the occasion.
Summary of the invention
In view of this, the present invention provides a kind of switch tube driving circuit, switching off device and distributed generation system, to be applicable in
In switching tube and the controller not occasion on ground altogether.
A kind of switch tube driving circuit, the switch tube driving circuit are the interface electricity between first switch tube and controller
Road；The first switch tube is connected on the anode of the first DC power supply, for the first DC power supply described in connection and disjunction and outside
The connection of portion's circuit；
The switch tube driving circuit includes DC/DC converter, enabled circuit, first diode, first capacitor and second
Circuit, in which:
The input terminal of the DC/DC converter connects the second DC power supply；There is a high frequency inside the DC/DC converter
Switching tube realizes DC voltage conversion by the high-frequency switch motion of the HF switch pipe；
The anode of the first diode connects the anode of first DC power supply, and the cathode of the first diode connects
The first end of the first capacitor is connect, the first tie point is formed；The pin connection described second of the HF switch pipe is straight
The positive or negative pole in galvanic electricity source, another pin connect the second end of the first capacitor；
The input terminal of the second circuit connects first tie point, makes described in the output end process of the second circuit
Driving pin of the energy circuit connection to the first switch tube；The second circuit is used for will be from the electricity of first tie point
Signal is converted into stable output voltage, and when the enabled circuit is connected, the output voltage is sent to as driving voltage
The driving pin of the first switch tube；
The controller controls switching on and off for the enabled circuit by hair pulse signal.
Optionally, the DC/DC converter is buck converter；
Corresponding, a pin of the HF switch pipe connects the positive or negative pole of second DC power supply, another
Pin connects the second end of the first capacitor, refers to: the first pin of the HF switch pipe connects the buck converter
Input anode；Second pin of the HF switch pipe connects the second end of the first capacitor.
Optionally, the DC/DC converter is boost converter；
Corresponding, a pin of the HF switch pipe connects the positive or negative pole of second DC power supply, another
Pin connects the second end of the first capacitor, refers to that the second pin of the HF switch pipe connects the boost converter
Input cathode；First pin of the HF switch pipe connects the second end of the first capacitor.
Optionally, second DC power supply be by first DC power supply through the first circuit conversion from；The control
The power input of device processed connects the output end of the DC/DC converter.
Optionally, the enabled circuit includes third NPN triode, the second PNP triode, first resistor, second resistance
And 3rd resistor, in which:
The base stage of the third NPN triode connects the controller, the third NPN triode through the first resistor
Emitter connect the ground wire of the controller, the collector of the third NPN triode is through described in 3rd resistor connection
The collector of the base stage of second PNP triode, second PNP triode is connected to the driving pin of the first switch tube,
The emitter of second PNP triode connects the output head anode of the second circuit, and the second resistance is connected to described
Between the base stage and emitter of second PNP triode.
Optionally, the enabled circuit includes the 4th resistance, the 5th resistance, the 6th resistance, the 5th NPN type triode, the
Six PNP triodes and the 7th NPN type triode, in which:
The base stage of 7th NPN type triode connects the controller, the 7th NPN type three through the 4th resistance
The emitter of pole pipe connects the ground wire of the controller, and the collector of the 7th NPN type triode successively passes through the described 5th
Resistance connects the output head anode of the second circuit with the 6th resistance；In 5th resistance and the 6th resistance
Intermediate node connects the base stage of the 5th NPN type triode and the 6th PNP triode, the 5th NPN type triode
Collector connects the output head anode of the second circuit, and the emitter of the 5th NPN type triode connects the 6th PNP
The driving pin of the emitter of triode and the first switch tube, the collector connection described the of the 6th PNP triode
Second pin of one switching tube and the negative pole of output end of the second circuit.
Optionally, the second circuit includes peak holding circuit and/or pressure limiting circuit, in which:
The peak holding circuit is used to send to using the spike potential of first tie point as driving voltage described
The driving pin of first switch tube；
The pressure limiting circuit is used to the output voltage stabilization of the second circuit being no more than the first switch tube energy
The maximum drive voltage value enough born.
Optionally, the switch tube driving circuit further include:
The discharge circuit being connected between the driving pin of the first switch tube and the enabled circuit, for described
When enabled circuit is in an off state, charge discharging resisting path is provided for the driving pin of the first switch tube.
A kind of switching off device, comprising: first switch tube, controller and the connection first switch tube and the controller
Interface circuit, the interface circuit are any switch tube driving circuit disclosed above.
A kind of distributed generation system, including one or more group strings, each group of string includes multiple switching off device, each shutdown
The input terminal of device connects a DC power supply, and the output end of each switching off device in same group of string is cascaded as load supplying,
Multiple groups are load supplying together in series and parallel；The switching off device is switching off device disclosed above.
It can be seen from the above technical scheme that switch tube driving circuit provided by the invention is connected to not the first of ground altogether
Between switching tube and controller, by the switch motion of HF switch pipe, the first tie point current potential is raised higher than first and is opened
The second pin for closing pipe, at this time if the driving pin that the first tie point is directly connected to first switch tube mentions for first switch tube
For driving voltage, as long as then guaranteeing that the potential difference between the first tie point and the second pin of first switch tube is higher than first switch
The driving threshold voltage of pipe, so that it may first switch tube be connected；At this moment, controller by enabled circuit send out pulse signal come
The on-off between the first tie point and the driving pin of first switch tube is controlled, that is, can control the on-off of first switch tube, thus
Meet design needs.In view of the current potential of the first tie point can be jumped with the switch motion of the HF switch pipe, for dimension
The stabilization for being supplied to the driving voltage of first switch tube is held, the present embodiment is also added between the first tie point and first switch tube
One second circuit.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to needed in the embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ability
For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is a kind of switch tube driving circuit structural schematic diagram；
Fig. 2 is another switch tube driving circuit structural schematic diagram；
Fig. 3, which is shown, enables electrical block diagram applied to one of switch tube driving circuit；
Fig. 4 is shown applied to another enabled electrical block diagram in switch tube driving circuit；
Fig. 5 is shown applied to one of switch tube driving circuit second circuit structural schematic diagram；
Fig. 6 is shown applied to another second circuit structural schematic diagram in switch tube driving circuit；
Fig. 7 is another switch tube driving circuit structural schematic diagram；
Fig. 8 is another switch tube driving circuit structural schematic diagram；
Fig. 9 is a kind of derailing switch structural schematic diagram；
Figure 10 is another derailing switch structural schematic diagram；
Figure 11 is a kind of distributed generation system structural schematic diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1 or Fig. 2 (difference of Fig. 1 and Fig. 2 is only that the topological structure that DC/DC converter 12 uses is different), originally
Inventive embodiments disclose a kind of switch tube driving circuit, and the switch tube driving circuit is first switch tube S1 and controller 10
Between interface circuit, effect be the pulse signal for exporting controller 10 be converted to can drive first switch tube S1 be connected
With the signal of shutdown.
First switch tube S1 is connected on the anode of the first DC power supply 11, for connect and the first DC power supply of disjunction 11 and
The connection of external circuit 20.That pin that the anode of first switch tube S1 and the first DC power supply 11 is connected directly is opened for first
That pin that the anode of the first pin of pass pipe S1, first switch tube S1 and external circuit 20 is connected directly is first switch tube
The second pin of S1.
Wherein, first switch tube S1 can be MOSFET (Metal-Oxide-Semiconductor Field-Effect
Transistor, Metal Oxide Semiconductor Field Effect Transistor), IGBT (Insulated Gate Bipolar
Transistor, insulated gate bipolar transistor) or triode or other controllable semiconductor switch devices.Work as first switch
When pipe S1 is MOSFET, the first pin of first switch tube S1 is the drain electrode of MOSFET, and the second pin of first switch tube S1 is
The source electrode of MOSFET, the grid that the driving pin of first switch tube S1 is MOSFET.When first switch tube S1 is IGBT, first
The first pin of switching tube S1 is the collector of IGBT, and the second pin of first switch tube S1 is the emitter of IGBT, and first opens
Close the grid that the driving pin of pipe S1 is IGBT.When first switch tube S1 is triode, the first pin of first switch tube S1
For the collector of triode, the second pin of first switch tube S1 is the emitter of triode, the driving tube of first switch tube S1
Foot is the base stage of triode.It only using first switch tube S1 is MOSFET as example in Fig. 1 and Fig. 2.
The building block of the switch tube driving circuit includes DC/DC converter 12, enabled circuit 13, first diode
D1, first capacitor C1 and second circuit 14, in which:
The input terminal of DC/DC converter 12 connects the second DC power supply；There is a HF switch inside DC/DC converter 12
Pipe S2, HF switch pipe refer to work in the switching tube of high frequency switch-mode, and switching frequency is generally in 10KHz or more；DC/DC
Converter 12 realizes that DC voltage conversion, DC/DC converter 12 specifically may be used by the high-frequency switch motion of HF switch pipe S2
Using the DC/DC converter of buck converter (as shown in Figure 1), boost converter (as shown in Figure 2) or other topological structures,
Do not limit to.
Passed through from the first circuit conversion specifically, second DC power supply can be by the first DC power supply 11, such as
Shown in Fig. 1 or Fig. 2,11 both end voltage of the first DC power supply is converted to DC voltage V2 by the first circuit, and DC/DC converter 12 is again
DC voltage V2 is converted into DC voltage V3.Wherein, first circuit can be reduction voltage circuit, booster circuit, reversed change
Change in circuit, current-limiting circuit, anti-circnit NOT and switching circuit one or it is any it is several be connected in series, specific structure is according to reality
Border needs to be designed, such as: it, can be by the first circuit when DC/DC converter 12 needs an input voltage for being higher than V1
It is designed to booster circuit；It, can when DC/DC converter 12 needs a negative pressure lower than the cathode voltage of the first DC power supply 11
With by the first circuit design at reciprocal transformation circuit；When needing to limit V1 and being input to the size of current of V2, or for inhibiting
It, can be by the first circuit design at current-limiting circuit when influence of the V1 surge to V2；When the possibility that V1 presence frequently changes, need to prevent
It, can be by the first circuit design at anti-circnit NOT when only V2 follows the bust of V1 and reduces；When need late-class circuit have low function
When consuming standby mode, switch can be disconnected when needing standby by the first circuit design at switching circuit.
In addition to this, second DC power supply can also be designed to a power supply independently of the first DC power supply 11.
Alternatively, second DC power supply can also be same power supply with the first DC power supply 11.
MCU (Microcontroller Unit, micro-control unit) and other light current circuits needs in controller 10 are opened
Power supply power supply is closed, to save cost, 12 output voltage of DC/DC converter can be multiplexed with the Switching Power Supply, i.e. controller
The output end of 10 power input connection DC/DC converter 12, such as shown in Fig. 1 or Fig. 2.It is of course also possible to be controller
10 additional setting Switching Power Supplies.
The anode of first diode D1 connects the anode of the first DC power supply 11, the cathode connection first of first diode D1
The first end of capacitor C1 forms the first tie point P1；The input terminal of second circuit 14 connects the first tie point P1, second circuit 14
Output end the driving pin of first switch tube S1 is connected to by enabled circuit 13, second circuit 14 from first for that will connect
The electric signal of contact P1 is converted into stable output voltage, in the case where enabled circuit 13 is connected, the output voltage conduct
Driving voltage sends the driving pin of first switch tube S1 to.Controller 10 controls enabled circuit 13 by hair pulse signal
It switches on and off.
A pin of HF switch pipe S2 connects the positive or negative pole of second DC power supply, another pin connection the
The second end of one capacitor C1 forms the second tie point P2.Specifically, when DC/DC converter 12 is buck converter, such as Fig. 1 institute
Show, the first pin of HF switch pipe S2 connects the input anode of the buck converter, the second pipe of HF switch pipe S2
The second end that foot connects first capacitor C1 forms the second tie point P2.When DC/DC converter 12 is using boost converter, such as
Shown in Fig. 2, the second pin of HF switch pipe S2 connects the input cathode of the boost converter, HF switch pipe S2's
The second end that first pin connects first capacitor C1 forms the second tie point P2.
The working principle of switch tube driving circuit shown in Fig. 1 is as follows:
It is the reference ground of the reference ground VG1 and first switch tube S1 of controller 10 respectively there are two with reference to ground in Fig. 1
VG2 is exactly the second pin of first switch tube S1 with reference to ground VG2, is exactly the input cathode of controller 10 with reference to ground VG1, V1,
The cathode of V2 and V3 links together.
Assuming that be 0V with reference to ground VG1 current potential, the inductance afterflow when HF switch pipe S2 is disconnected, in DC/DC converter 12
Lead to the diode current flow in DC/DC converter 12, the second tie point P2 current potential pulled down to 0V, and the first DC power supply 11 passes through
First diode D1 is first capacitor C1 charging, and when C1 is fully charged, the first tie point P1 current potential reaches V1.When HF switch pipe
When S2 is closed, the second tie point P2 current potential is equal to V2, since the voltage of first capacitor C1 cannot be mutated, the first tie point P1 current potential
It is raised to V1+V2, it is seen then that by the switch motion of HF switch pipe S2, the current potential of the first tie point P1 can be raised to
Higher than the current potential of the first pin of first switch tube S1 (current potential of the first pin of first switch tube S1 is always V1).
And since existing body diode can make the current potential of the second pin of first switch tube S1 not high in first switch tube S1
In the current potential of the first pin of first switch tube S1, so the current potential of the first tie point P1 is higher than the first pin of first switch tube S1
When current potential, the inevitable current potential also above the second pin of first switch tube S1, at this time if the first tie point P1 is directly connected to S1
Driving pin provide driving voltage for S1, as long as then guaranteeing between the first tie point P1 and first switch tube S1 the second pin
Potential difference VPSDriving threshold voltage V higher than first switch tube S1GS, so that it may so that S1 is connected.
In view of the current potential of the first tie point P1 can be jumped with the switch motion of HF switch pipe S2, in order to maintain to provide
To the stabilization of the driving voltage of S1, the present embodiment increases one second electricity between the first tie point P1 and HF switch pipe S2
Road 14, second circuit 14 are used to the first tie point P1 current potential being converted into stable output voltage, certainly, second circuit 14 it is defeated
Voltage must be higher than V outGS。
In the case where 14 internal component parameter of second circuit determines, the output voltage of second circuit 14 with V2 increase
And increase, it is possible to guarantee that the output voltage of second circuit 14 is higher than V by adjusting the size of V2GS.For example, it is assumed that
The function of second circuit 14 be specifically by the output voltage stabilization of second circuit 14 the first tie point P1 current potential peak value V1+
V2, then in the case where 14 internal component parameter of second circuit determines, as long as setting V2 is higher than VGS, so that it may guarantee the second electricity
The output voltage on road 14 is higher than VGS。
When connecting the disconnection of enabled circuit 13 of driving pin of the first tie point P1 and first switch tube, the output electricity
Pressure cannot send the driving pin of first switch tube S1 to again, then S1 ends.Controller 10 is made by hair pulse signal to control
Energy circuit 13 switches on and off, to realize the on-off control to first switch tube S1.
In summary description it is found that switch tube driving circuit shown in Fig. 1 can first switch tube S1 and controller 10 not
Under occasion altogether, the pulse signal that controller 10 exports is converted to the letter that can drive first switch tube S1 turn-on and turn-off
Number, meet design needs.
Same reason, can be by the electricity of the first tie point P1 by the switch motion of HF switch pipe S2 in Fig. 2
Position be raised to V1+V3,14 internal component parameter of second circuit determine in the case where, the output voltage of second circuit 14 it is big
It is small to depend on V3.For example, it is assumed that the function of second circuit 14 is specifically by the output voltage stabilization of second circuit 14 defeated
The the first tie point P1 current potential peak value V1+V3 entered, then in the case where 14 internal component parameter of second circuit determines, as long as control
V3 processed is higher than VGS, so that it may guarantee that the output voltage of second circuit 14 is higher than VGS。
When DC/DC converter 12 uses other types using other topological structures, the second DC power supply, switching tube driving electricity
The principle Analysis on road can similarly obtain, and no longer repeat one by one herein.
As seen from the above description, switch tube driving circuit provided in an embodiment of the present invention is connected to not the first switch on ground altogether
Between pipe S1 and controller 10, by the switch motion of HF switch pipe S2, the first tie point P1 current potential is raised higher than S1
The second pin, at this time if providing the first tie point P1 driving pin for being directly connected to S1 to driving voltage for S1, as long as
Guarantee the potential difference V between the second pin of the first tie point P1 and S1PSDriving threshold voltage V higher than S1GS, so that it may so that
S1 conducting；At this moment, controller 10 controls the driving tube of the first tie point P1 and S1 by sending out pulse signal to enabled circuit 13
On-off between foot, i.e., the on-off of controllable S1.In view of the current potential of the first tie point P1 can be with the switch of HF switch pipe S2
It acts and jumps, the stabilization of the driving voltage of S1 is supplied to for maintenance, the present embodiment also increases between the first tie point P1 and S1
If second circuit 14.
Optionally, in any switch tube driving circuit disclosed above, topological structure such as Fig. 3 institute of circuit 13 is enabled
Show, including third NPN triode Q3, the second PNP triode Q2, first resistor R1, second resistance R2 and 3rd resistor R3,
In: the base stage of Q3 is through first resistor R1 connection controller 10, the ground wire of the emitter connection controller 10 of Q3, the collector warp of Q3
The base stage of 3rd resistor R3 connection Q2, the collector of Q2 are connected to the driving pin of S1, and the emitter of Q2 connects second circuit 14
Output head anode, second resistance R2 is connected between the base stage of Q2 and emitter.
The working principle of circuit 13 is enabled shown in Fig. 3 are as follows: when pulse signal is high level, Q3 conducting, by the base stage of Q2
It drags down, so that Q2 is in saturation conduction is connected S1 supplying driving voltage to S1；When the pulse signal is low level, Q3
Cut-off, Q2 are also at off state, and driving voltage cannot be transported to S1, S1 shutdown.
Alternatively, enabling circuit 13 can also be realized using push-pull circuit when of less demanding to drive loss.Such as Fig. 4 institute
Show, enabling circuit 13 includes: the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 5th NPN type triode Q5, the 6th PNP
Triode Q6 and the 7th NPN type triode Q7, in which: the base stage of Q7 is through the 4th resistance R4 connection controller 10, the emitter of Q7
The ground wire of controller 10 is connected, the collector of Q7 successively passes through the defeated of the 5th resistance R5 and the 6th resistance R6 connection second circuit 14
Outlet anode；The base stage of the intermediate node connection Q5 and Q6 of 5th resistance R5 and the 6th resistance R6, the collector connection second of Q5
The output head anode of circuit 14, the emitter of the emitter connection Q6 of Q5 and the driving pin of S1, the collector connection S1's of Q6
The negative pole of output end of second pin and second circuit 14.
The working principle of circuit 13 is enabled shown in Fig. 4 are as follows: when pulse signal is high level, Q3 conducting, by Q5's and Q6
Base stage is pulled to low pressure, Q5 cut-off, and driving voltage can not be supplied to S1, S1 shutdown, while Q6 is connected, the driving pin for being S1 and the
Parasitic capacitance between two pins provides discharge path；When pulse signal is low level, Q3 shutdown, the base stage pull-up of Q5 and Q6
To driving power voltage, Q6 cut-off, Q5 amplifies state conducting, and driving voltage is to be supplied to S1 by Q5, S1 conducting.
Optionally, referring to Fig. 5, second circuit 14 can use peak holding circuit, for by the peak of the first tie point P1
Value current potential sends S1 to as driving voltage.The peak holding circuit includes the second diode D2 and the second capacitor C2, D2's
Anode is connected to the first end and enabled circuit 13 of the cathode connection C2 of the first tie point P1, D2, the second end connection S1's of C2
Second pin.C2 both end voltage will not jumping to and change with the first tie point P1 current potential, V2 is remained at, so being supplied to
The driving voltage of first switch tube S1 will stabilise at V1+V2.
Alternatively, as shown in fig. 6, second circuit 14 can also use pressure limiting circuit.The pressure limiting circuit includes the five or two pole
Pipe D5 and linear power supply form pressure limiting circuit in such a way that the 5th diode D5 connects linear power supply 143, and output voltage is steady
It is scheduled on and is no more than the driving voltage maximum value that first switch tube S1 can be born, be additionally provided on the 5th diode D5 of input terminal
It can also play the role of preventing reverse direction current flow, avoid the output voltage of the pressure limiting circuit because of the electricity of the first tie point P1
Pressure drop is low and reduces, to maintain the stabilization of driving voltage.Wherein, the linear power supply includes voltage-stabiliser tube Z1, the first NPN tri-
The second pin of the anode connection S1 of pole pipe Q1 and the 9th resistance R9, voltage-stabiliser tube Z1, the ground level of the cathode connection Q1 of voltage-stabiliser tube Z1,
The cathode of 9th resistance R9 connection D5 and the ground level of Q1, the emitter of Q1 connect the driving pin of S1 through enabled circuit 13, Q1's
The cathode of collector connection D5.The linear power supply in Fig. 6 does Linear Amplifer as a reference source, Q1 using voltage-stabiliser tube
Mode.Alternatively, the linear power supply based on other a reference sources such as TL431 can also be used.Alternatively, linear power supply can also use DC/
DC converter is realized.Second circuit 14 is particularly suitable for the case where V2 unstable or overtension.
Alternatively, second circuit 14 can also be regard the peak holding circuit and pressure limiting circuit series connection as, such as Fig. 7 institute
Show and (save the 5th diode D5 after series connection), the peak holding circuit exports stable voltage as the defeated of the pressure limiting circuit
Enter, driving voltage as S1 after the pressure limiting circuit again further limits input voltage.
Optionally, referring to Fig. 7, any switch tube driving circuit disclosed above further include: be connected in parallel on the driving tube of S1
Discharge circuit 15 between foot and enabled circuit 13, for being opened for described first when the enabled circuit is in close state
The driving pin for closing pipe provides charge discharging resisting path.Specifically, due to there is parasitism between the driving pin and the second pin of S1
Junction capacity, after the shutdown of enabled circuit 13, the junction capacity velocity of discharge is very slow, will lead to that S1 turn-off speed is very slow, shutdown damage
Consumption is very big, it could even be possible to S1 is caused to cross cause thermal damage.Therefore, it is the knot when S1 is turned off that the present embodiment, which increases a discharge circuit,
The charge of capacitor discharges, to accelerate S1 turn-off speed.
Referring also to Fig. 7, discharge circuit 15 can be discharged using the 7th resistance R7, it is contemplated that the resistance value of the velocity of discharge, R7 is logical
Often between 10K Ω~100K Ω.When Q2 is connected, R7 can consume the electric energy of driving voltage, such as driving voltage is 12V, R7=
10K Ω, R7 power consumption is 12*12/10K=14.4mW when Q2 is connected.
Alternatively, as shown in figure 8, discharge circuit 15 can also using the velocity of discharge based on PNP triode faster, power consumption more
Low discharge circuit, comprising: the 8th resistance R8, the 4th PNP triode Q4, the 4th diode D4.Its working principle is that: it is led in Q2
When logical, the base potential of Q4 is equal to driving voltage, Q4 cut-off, and driving voltage is supplied to S1 by D4；In Q2 shutdown, the base of Q4
Electrode potential is by resistive pull-downs to collector potential, and Q4 is in amplification state conducting, and conduction impedance is very low, rapidly by the junction capacity of S1
On tension discharge to threshold voltage hereinafter, rapidly switching off S1.Due to not depending on R8 electric discharge, R8 value can be very big,
Such as it is taken as 1M Ω, when driving voltage is 12V, resistance R8 power consumption is 12*12/1M=0.144mW when Q2 is connected, and power consumption is substantially
Reduce.
The embodiment of the invention also discloses a kind of switching off device, as shown in Figure 9, comprising: first switch tube S1, controller 10 with
And the interface circuit of connection first switch tube S1 and controller 10, the interface circuit are that any switching tube disclosed above drives
Dynamic circuit.
The switching off device is connected between the first DC power supply 11 and external circuit 20, by the switch of first switch tube S1
Movement, the connection of connection and the first DC power supply of disjunction 11 and external circuit 20.Switching off device connection external circuit 20 can be with
Refer to the local load of connection, connection DC bus or connects with other switching off device.
Optionally, referring also to Fig. 9, the switching off device further includes third diode of the inverse parallel in the switching off device output end
D3, for providing current path for external circuit when first switch tube S1 is disconnected.For example, being connected on one in multiple output ends
When the switching off device risen is load supplying jointly, when wherein 1 switching off device is in an off state, the output electricity of remaining switching off device
The D3 that stream can flow through the switching off device forms access, is unlikely to all can not because the switching off device turns off the switching off device for causing other all
Output.
Optionally, referring to Figure 10, any switching off device disclosed above further include: be connected in parallel on the output end of the switching off device
MOSFET S3 and the second driving circuit for being connected between controller 10 and MOSFET S3.The present embodiment MOSFET
S3 substitutes D3, and the loss and fever when S3 is connected are lower than D3, therefore can reduce the cost of radiator, in multiple switching off device strings
When connection is load supplying, the efficiency of load supplying can also be risen to.Controller 10 is controlled by the second driving circuit of control
The on-off of MOSFET S3.
Wherein, when switching off device exists simultaneously S1 and S3, if S1 and S3 are simultaneously turned on, to will lead to the first DC power supply 11 short
Road, therefore controller 10 is when controlling S1 conducting, it is necessary to control S3 shutdown.Controller 10, can basis when controlling S1 shutdown
It needs to control whether conducting S3, for example, after S1 shutdown, when detecting that electric current flows through the antiparallel body diode of S3,
S3 conducting is then controlled, to reduce diode current flow loss, when not having electric current to flow through S3, can control S3 shutdown.
In addition, S1 is single-way switch, the first DC power supply 11 can be prevented to export electric energy to output end when off, still
If output end voltage is more than V1, can be poured on the first DC power supply 11 from the antiparallel body diode of S1 is counter.In this regard, still joining
See that Figure 10, any switching off device disclosed above can also include the 4th switching tube S4, S1, S4 differential concatenation, the driving of S1, S4
Pin is connected in parallel, and shares the same driving circuit, and using the switching off device scheme of Figure 10, two-way shutdown may be implemented.
The embodiment of the invention also discloses a kind of distributed generation systems, include multiple switching off device, each as shown in figure 11
The input terminal of switching off device connects a DC power supply, and each switching off device output end is cascaded to form a group string, and group string supplies for load
Electricity, when there are multiple groups of strings, multiple groups are load supplying together in series and parallel, and the switching off device is disclosed above any
Switching off device.In Figure 11, the first DC power supply 11 can be photovoltaic module, battery, super capacitor or fuel cell.Load can
Think electrical equipment, DC/AC converter, the DC/DC converter etc. of direct current supply.Each switching off device controls needs according to itself,
It chooses whether input terminal DC power supply being output to output end.Alternatively, distributed generation system also has a host, by logical
Letter is to send instructions under switching off device, to control whether single or all switching off device by input terminal DC power supply is output to output
End.The communication can be based on power line carrier communication, wireless communication, RS485 wire communication, dry contact connection communication etc. wherein
One kind, do not limit to.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Herein, relational terms such as first and second and the like be used merely to by an entity or operation with it is another
One entity or operation distinguish, and without necessarily requiring or implying between these entities or operation, there are any this reality
Relationship or sequence.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments in the case where not departing from the spirit or scope of the embodiment of the present invention.Therefore,
The embodiment of the present invention is not intended to be limited to the embodiments shown herein, and be to fit to principles disclosed herein and
The consistent widest scope of features of novelty.
Claims (10)
1. a kind of switch tube driving circuit, which is characterized in that the switch tube driving circuit be first switch tube and controller it
Between interface circuit；The first switch tube is connected on the anode of the first DC power supply, for connecting with described in disjunction first directly
The connection in galvanic electricity source and external circuit；
The switch tube driving circuit includes DC/DC converter, enables circuit, first diode, first capacitor and second circuit,
Wherein:
The input terminal of the DC/DC converter connects the second DC power supply；There is a HF switch inside the DC/DC converter
Pipe realizes DC voltage conversion by the high-frequency switch motion of the HF switch pipe；
The anode of the first diode connects the anode of first DC power supply, and the cathode of the first diode connects institute
The first end of first capacitor is stated, the first tie point is formed；One pin of the HF switch pipe connects second direct current
The positive or negative pole in source, another pin connect the second end of the first capacitor；
The input terminal of the second circuit connects first tie point, and the output end of the second circuit passes through the enabled electricity
Road is connected to the driving pin of the first switch tube；The second circuit is used for will be from the electric signal of first tie point
It is converted into stable output voltage, when the enabled circuit is connected, the output voltage sends to described as driving voltage
The driving pin of first switch tube；
The controller controls switching on and off for the enabled circuit by hair pulse signal.
2. switch tube driving circuit according to claim 1, which is characterized in that the DC/DC converter is buck transformation
Device；
Corresponding, a pin of the HF switch pipe connects the positive or negative pole of second DC power supply, another pin
The second end for connecting the first capacitor, refers to: the first pin of the HF switch pipe connects the defeated of the buck converter
Enter proper pole；Second pin of the HF switch pipe connects the second end of the first capacitor.
3. switch tube driving circuit according to claim 1, which is characterized in that the DC/DC converter is boost transformation
Device；
Corresponding, a pin of the HF switch pipe connects the positive or negative pole of second DC power supply, another pin
The second end for connecting the first capacitor refers to that the second pin of the HF switch pipe connects the defeated of the boost converter
Enter to hold cathode；First pin of the HF switch pipe connects the second end of the first capacitor.
4. switch tube driving circuit according to claim 1, which is characterized in that second DC power supply is by described
One DC power supply is through the first circuit conversion；The power input of the controller connects the output of the DC/DC converter
End.
5. switch tube driving circuit according to claim 1, which is characterized in that the enabled circuit includes the 3rd NPN tri-
Pole pipe, the second PNP triode, first resistor, second resistance and 3rd resistor, in which:
The base stage of the third NPN triode connects the controller, the hair of the third NPN triode through the first resistor
Emitter-base bandgap grading connects the ground wire of the controller, and the collector of the third NPN triode is through 3rd resistor connection described second
The collector of the base stage of PNP triode, second PNP triode is connected to the driving pin of the first switch tube, described
The emitter of second PNP triode connects the output head anode of the second circuit, and the second resistance is connected to described second
Between the base stage and emitter of PNP triode.
6. switch tube driving circuit according to claim 1, which is characterized in that the enabled circuit include the 4th resistance,
5th resistance, the 6th resistance, the 5th NPN type triode, the 6th PNP triode and the 7th NPN type triode, in which:
The base stage of 7th NPN type triode connects the controller, the 7th NPN type triode through the 4th resistance
Emitter connect the ground wire of the controller, the collector of the 7th NPN type triode successively passes through the 5th resistance
The output head anode of the second circuit is connected with the 6th resistance；The middle node of 5th resistance and the 6th resistance
Point connects the base stage of the 5th NPN type triode and the 6th PNP triode, the current collection of the 5th NPN type triode
Pole connects the output head anode of the second circuit, and the emitter of the 5th NPN type triode connects tri- pole the 6th PNP
The collector connection described first of the driving pin of the emitter of pipe and the first switch tube, the 6th PNP triode is opened
Close the second pin of pipe and the negative pole of output end of the second circuit.
7. switch tube driving circuit according to claim 1, which is characterized in that the second circuit includes peak holding electricity
Road and/or pressure limiting circuit, in which:
The peak holding circuit is used to send the spike potential of first tie point to described first as driving voltage
The driving pin of switching tube；
The pressure limiting circuit is used to no more than the first switch tube to hold the output voltage stabilization of the second circuit
The maximum drive voltage value received.
8. switch tube driving circuit according to claim 1, which is characterized in that the switch tube driving circuit further include:
The discharge circuit being connected between the driving pin of the first switch tube and the enabled circuit, for described enabled
When circuit is in an off state, charge discharging resisting path is provided for the driving pin of the first switch tube.
9. a kind of switching off device characterized by comprising first switch tube, controller and the connection first switch tube and institute
The interface circuit of controller is stated, the interface circuit is switch tube driving circuit of any of claims 1-8.
10. a kind of distributed generation system, which is characterized in that including one or more group string, each group of string includes multiple shutdowns
Device, the input terminal of each switching off device connect a DC power supply, and the output end of each switching off device in same group of string is cascaded
For load supplying, multiple groups are load supplying together in series and parallel；The switching off device is switching off device as claimed in claim 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811268033.9A CN109347465B (en) | 2018-10-29 | 2018-10-29 | Switching tube driving circuit, turn-off device and distributed power generation system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811268033.9A CN109347465B (en) | 2018-10-29 | 2018-10-29 | Switching tube driving circuit, turn-off device and distributed power generation system |
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| CN109347465B CN109347465B (en) | 2022-09-16 |
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| CN109347465B (en) | 2022-09-16 |
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