CN110518789A - A kind of soft switch circuit and power electronic equipment - Google Patents
A kind of soft switch circuit and power electronic equipment Download PDFInfo
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- CN110518789A CN110518789A CN201910722909.0A CN201910722909A CN110518789A CN 110518789 A CN110518789 A CN 110518789A CN 201910722909 A CN201910722909 A CN 201910722909A CN 110518789 A CN110518789 A CN 110518789A
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- power switching
- switching
- energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of soft switch circuit and power electronic equipments.The soft switch circuit of the application can make device for power switching realize zero-current switching in turn off process, and high degree reduces turn-off power loss, so that device for power switching be made to reduce the generation of heat in turn off process；And script is flowed into electric energy caused by the electric current of device for power switching in device for power switching shutdown and is stored, and the electric energy feed system other component of storage is used in device for power switching conducting, to save the energy, and improve the working efficiency of power electronic equipment；In addition, soft switch circuit is separately provided to device for power switching in the application, to make Sofe Switch process be not necessarily to consider the other structures of device for power switching place circuit, to make soft switch circuit that can realize exclusive use.
Description
Technical field
The present invention relates to field of power electronics, more particularly to a kind of soft switch circuit and power electronic equipment.
Background technique
Power electronic equipment work when, in device for power switching can generate certain power loss, specifically, power
Total power consumption=device for power switching that switching device generates is being opened in power loss+device for power switching that the on-state stage generates
The power loss that logical/off-phases generate.When the switching frequency of device for power switching is lower, on-state power consumption is the master that it is generated
Want power consumption；When the switching frequency of device for power switching is higher, on/off power consumption is the main power consumption that it is generated, and due to
The presence of stray inductance in the route that device for power switching is connected to, shutdown power consumption, which is higher than, opens power consumption.As it can be seen that being opened in power
In the higher situation of switching frequency for closing device, the shutdown power consumption of device for power switching largely affects power switch device
The total power consumption of part so as to cause energy waste, and causes the working efficiency of power electronic equipment lower.
Therefore, how to provide a kind of scheme of solution above-mentioned technical problem is that those skilled in the art needs to solve at present
The problem of.
Summary of the invention
The object of the present invention is to provide a kind of soft switch circuit and power electronic equipments, are turning off device for power switching
The generation of heat is reduced in journey；And the energy has been saved, improve the working efficiency of power electronic equipment；In addition, the application make it is soft
Switching circuit can realize exclusive use.
In order to solve the above technical problems, the present invention provides a kind of soft switch circuits, comprising:
The conduct current circuit being connected in parallel with device for power switching in power electronic equipment, for working as the power switch
When device turns off, the electric current for flowing into the device for power switching is imported into itself circuit, and the electric energy that the electric current is generated into
Row storage；
The energy connecting respectively with the energy recovering circuit in the conduct current circuit and the power electronic equipment is let out
Electric discharge road, for when device for power switching conducting, the electric energy of the conduct current circuit storage to be released to the energy
Recovery circuit is measured, for power electronic equipment use.
Preferably, the conduct current circuit includes first diode and capacitor；Wherein:
The anode of the first diode is connect with the first end of the device for power switching, the yin of the first diode
Pole is connect with the first end of the capacitor, and the second end of the capacitor is connect with the second end of the device for power switching；Wherein,
The device for power switching is specially the device for power switching that electric current flows to second end from first end when being connected；
The capacitor is used to be directly entered charged state when device for power switching shutdown, and the electric current is generated
Electric energy stored；
Correspondingly, the energy leadage circuit is specifically used for storing up the capacitor when device for power switching conducting
The electric energy deposited is released to the energy recovering circuit.
Preferably, the energy leadage circuit includes isolating transformer, switching network circuit and rectification unit；Wherein:
The first end of the switching network circuit is connect with the first end of the capacitor, and the second of the switching network circuit
End is connect with the second end of the capacitor, the third end of the switching network circuit and the primary side first end of the isolating transformer
Connection, the 4th end of the switching network circuit are connect with the primary side second end of the isolating transformer, the switching network electricity
The control terminal on road is connect with the controller in the power electronic equipment, and the secondary side of the isolating transformer is single by the rectification
It is first to be connect with the energy recovering circuit；Wherein, the secondary voltage of the isolating transformer is satisfied with the energy recovering circuit
Recycling demand voltage；
The controller is used to control the switching network circuit while controlling device for power switching conducting and open
Beginning work, so that the switching network circuit releases the electric energy that the capacitor stores to subsequent conditioning circuit.
Preferably, the switching network circuit is specially voltage conversion circuit；The controller is specifically used in control institute
While stating device for power switching conducting, returning for the energy recovering circuit is satisfied in the secondary voltage of the isolating transformer
Under the constraint condition for receiving demand voltage, controls the voltage conversion circuit and start to carry out voltage conversion, the capacitor is stored
Electric energy release to subsequent conditioning circuit.
Preferably, the switching network circuit includes wave generator circuit and controllable switch；Wherein:
Control terminal of the triggering end of the wave generator circuit as the switching network circuit, the wave generator circuit
First end and third end of the power positive end as the switching network circuit, the power supply negative terminal of the wave generator circuit and institute
State the first end connection of controllable switch and the second end as the switching network circuit, the output end of the wave generator circuit
It is connect with the control terminal of the controllable switch, fourth end of the second end of the controllable switch as the switching network circuit；
Wherein, the controllable switch is specially the switch that electric current flows to first end from second end when being connected；
The controller is specifically used for that electricity occurs using the waveform while controlling device for power switching conducting
Road drives the controllable switch to be connected with a constant switching frequency, and the electric energy that the capacitor stores is released to subsequent conditioning circuit.
Preferably, the wave generator circuit is specially high-frequency self-excitation oscillating circuit.
Preferably, the controllable switch is specially IGBT or MOSFET.
Preferably, the energy recovering circuit is specially the power supply or the power electronics of the power electronic equipment
The DC bus of equipment.
In order to solve the above technical problems, the present invention also provides a kind of power electronic equipment, including device for power switching, also
Including any of the above-described kind of soft switch circuit.
Preferably, when the device for power switching is N number of, the power electronic equipment includes the energy leadage circuit
It further include N number of counnter attack diode with N number of conduct current circuit, N is the integer greater than 1；Wherein:
In n-th of conduct current circuit, the first end of the anode of first diode and n-th of device for power switching
Connection, the cathode of first diode are connect with the anode of the first end of capacitor and n-th of counnter attack diode respectively, n-th of counnter attack
The cathode of diode is connect with the cathode of the energy leadage circuit and remaining counnter attack diode respectively, the second end difference of capacitor
It is connect with the second end of n-th device for power switching Q and the energy leadage circuit；Wherein, n=1,2 ... .N；
The energy leadage circuit is specifically used for when the conducting of any device for power switching, this device for power switching is corresponding
Conduct current circuit in capacitor storage electric energy release to the energy recovering circuit.
The present invention provides a kind of soft switch circuits, comprising: is connected in parallel with device for power switching in power electronic equipment
Conduct current circuit, for when device for power switching shutdown when, the electric current for flowing into device for power switching is imported into itself circuit,
And the electric energy that electric current generates is stored；Connect respectively with the energy recovering circuit in conduct current circuit and power electronic equipment
The energy leadage circuit connect, for when device for power switching conducting, the electric energy of conduct current circuit storage to be released to energy
Recovery circuit, for power electronic equipment use.
As it can be seen that the soft switch circuit of the application can will flow into the electricity of device for power switching when device for power switching turns off
Conductance enters itself circuit, so that device for power switching be made to realize that zero-current switching, high degree reduce shutdown in turn off process
Loss, so that device for power switching be made to reduce the generation of heat in turn off process；And it will be former in device for power switching shutdown
Electric energy caused by the electric current of this inflow device for power switching stores, and in device for power switching conducting by the electricity of storage
Energy feed system other component uses, to save the energy, and improves the working efficiency of power electronic equipment；In addition, this
Soft switch circuit is separately provided to device for power switching in application, to make Sofe Switch process without considering device for power switching place
The other structures of circuit, to make soft switch circuit that can realize exclusive use.
The present invention also provides a kind of power electronic equipments, with above-mentioned soft switch circuit beneficial effect having the same.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to institute in the prior art and embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of soft switch circuit provided in an embodiment of the present invention；
Fig. 2 is a kind of concrete structure schematic diagram of soft switch circuit provided in an embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram of soft switch circuit as shown in Figure 2 provided in an embodiment of the present invention；
Fig. 4 is another structural schematic diagram of soft switch circuit as shown in Figure 2 provided in an embodiment of the present invention；
Fig. 5 is a kind of structural schematic diagram of three-level inverter provided in an embodiment of the present invention；
Fig. 6 is a kind of structural schematic diagram of the soft switch circuit of more device for power switching provided in an embodiment of the present invention.
Specific embodiment
Core of the invention is to provide a kind of soft switch circuit and power electronic equipment, is turning off device for power switching
The generation of heat is reduced in journey；And the energy has been saved, improve the working efficiency of power electronic equipment；In addition, the application make it is soft
Switching circuit can realize exclusive use.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Fig. 1 is please referred to, Fig. 1 is a kind of structural schematic diagram of soft switch circuit provided in an embodiment of the present invention.
The soft switch circuit includes:
The conduct current circuit 1 being connected in parallel with device for power switching Q in power electronic equipment, for working as power switch device
When part Q is turned off, the electric current for flowing into device for power switching Q is imported into itself circuit, and the electric energy that electric current generates is stored；
The energy leadage circuit 2 being connect respectively with the energy recovering circuit in conduct current circuit 1 and power electronic equipment,
For when device for power switching Q conducting, the electric energy that conduct current circuit 1 stores to be released to energy recovering circuit, with power supply
Power electronic equipment uses.
Specifically, the soft switch circuit of the application includes conduct current circuit 1 and energy leadage circuit 2, working principle
Are as follows:
In the prior art, as device for power switching Q (such as IGBT (the Insulated Gate in power electronic equipment
Bipolar Transistor, insulated gate bipolar transistor), MOSFET (Metal-Oxide-Semiconductor
Field-Effect Transistor, metal oxide layer semiconductcor field effect transisto) constant power switching device) shutdown when, function
The electric current of rate switching device Q will not drop to zero immediately, but have a fall time, but the voltage of device for power switching Q is
Through causing the electric current of device for power switching Q and voltage during this period of time to have a crossover region from liter above freezing, to generate shutdown
Loss；Moreover, because in the route that device for power switching Q is connected to stray inductance presence, device for power switching Q can be hindered
The decline of electric current causes the decrease speed of the electric current of device for power switching Q slack-off, larger so as to cause turn-off power loss.
Based on this, device for power switching Q both ends of the application in a power electronic equipment conduct current circuit in parallel
1, when device for power switching Q shutdown, the electric current for flowing into device for power switching Q can be imported immediately itself by conduct current circuit 1
Circuit, so that the electric current of device for power switching Q be made to drop to zero immediately, i.e. device for power switching Q realizes zero in turn off process
Switch off current, electric current of device for power switching Q and voltage there's almost no crossover region in the case of this, and high degree reduces shutdown damage
Consumption.For device for power switching Q, itself can be reduced while reducing turn-off power loss and generates heat, that is, applies the Sofe Switch
Circuit can transfer power switching device Q to a certain extent thermal losses so that device for power switching Q can achieve cooling
Effect can effectively play the effect for reducing temperature rise especially in the case where device for power switching Q arrival temperature rise is critical, thus
Protect device for power switching Q.
Moreover, script can also be flowed into device for power switching Q's by conduct current circuit 1 when device for power switching Q shutdown
Electric energy caused by electric current stores completely, in order to power electronic equipment work (device for power switching Q be connected when, electric power
Electronic equipment is in running order) when reuse.Based on this, the electricity for storing conduct current circuit 1 is arranged in the application
The energy leadage circuit 2 that electronic equipment uses can be supplied electric power.Specifically, when device for power switching Q is connected, energy vent discharge
Road 2 can release the electric energy that conduct current circuit 1 stores to energy recovering circuit (the i.e. energy leadage circuit of power electronic equipment
The exclusive leadage circuit of 2 electric energy stored as conduct current circuit 1), to be used for electric power electronic device works.
In addition, soft switch circuit is separately provided to device for power switching Q in the application, to make Sofe Switch process without considering
The other structures of circuit where device for power switching Q, to make soft switch circuit that can realize exclusive use.
The present invention provides a kind of soft switch circuits, comprising: is connected in parallel with device for power switching in power electronic equipment
Conduct current circuit, for when device for power switching shutdown when, the electric current for flowing into device for power switching is imported into itself circuit,
And the electric energy that electric current generates is stored；Connect respectively with the energy recovering circuit in conduct current circuit and power electronic equipment
The energy leadage circuit connect, for when device for power switching conducting, the electric energy of conduct current circuit storage to be released to energy
Recovery circuit, for power electronic equipment use.
As it can be seen that the soft switch circuit of the application can will flow into the electricity of device for power switching when device for power switching turns off
Conductance enters itself circuit, so that device for power switching be made to realize that zero-current switching, high degree reduce shutdown in turn off process
Loss, so that device for power switching be made to reduce the generation of heat in turn off process；And it will be former in device for power switching shutdown
Electric energy caused by the electric current of this inflow device for power switching stores, and in device for power switching conducting by the electricity of storage
Energy feed system other component uses, to save the energy, and improves the working efficiency of power electronic equipment；In addition, this
Soft switch circuit is separately provided to device for power switching in application, to make Sofe Switch process without considering device for power switching place
The other structures of circuit, to make soft switch circuit that can realize exclusive use.
On the basis of the above embodiments:
Referring to figure 2., Fig. 2 is a kind of concrete structure schematic diagram of soft switch circuit provided in an embodiment of the present invention.
As a kind of optionally embodiment, conduct current circuit 1 includes first diode D1 and capacitor C；Wherein:
The anode of first diode D1 is connect with the first end of device for power switching Q, the cathode and electricity of first diode D1
Hold the first end connection of C, the second end of capacitor C is connect with the second end of device for power switching Q；Wherein, device for power switching Q has
Electric current flows to the device for power switching of second end from first end when body is conducting；
Capacitor C is used to be directly entered charged state when device for power switching Q shutdown, and the electric energy that electric current is generated carries out
Storage；
Correspondingly, energy leadage circuit 2 is specifically used for letting out the capacitor C electric energy stored when device for power switching Q conducting
It puts to energy recovering circuit.
Specifically, the conduct current circuit 1 of the application includes first diode D1 and capacitor C, its working principle is that:
When device for power switching Q shutdown, due to the presence of first diode D1 and capacitor C, device for power switching Q is flowed into
Electric current can be oriented to capacitor C rapidly, so that the electric current of device for power switching Q is dropped to zero immediately；Another aspect capacitor C exists
Electric current is directly entered charged state after flowing into, and electric energy caused by electric current is stored.
Based on this, when device for power switching Q conducting, energy leadage circuit 2 is specifically that the capacitor C electric energy stored is released
To energy recovering circuit, the capacitor C electric energy stored is on the one hand supplied electric power into electronic equipment and is reused, with energy saving；Separately
On the one hand so that capacitor C is entered discharge condition, i.e., discharge the capacitor C electric energy stored, prevent capacitor C from reaching nothing after full power state
Method continues to store electric energy, prepares to turn off for device for power switching Q next time.
As a kind of optionally embodiment, energy leadage circuit 2 includes isolating transformer T, switching network circuit 21 and whole
Flow unit 22；Wherein:
The first end of switching network circuit 21 is connect with the first end of capacitor C, the second end and electricity of switching network circuit 21
Hold the second end connection of C, the third end of switching network circuit 21 is connect with the primary side first end of isolating transformer T, switching network
4th end of circuit 21 is connect with the primary side second end of isolating transformer T, the control terminal and power electronics of switching network circuit 21
Controller connection in equipment, the secondary side of isolating transformer T are connect by rectification unit 22 with energy recovering circuit；Wherein, every
Secondary voltage from transformer T is satisfied with the recycling demand voltage of energy recovering circuit；
Controller is used for while controlling device for power switching Q conducting, and control switch lattice network 21 is started to work, with
Make switching network circuit 21 that the capacitor C electric energy stored to be released to subsequent conditioning circuit.
Specifically, the energy leadage circuit 2 of the application includes isolating transformer T, switching network circuit 21 and rectification unit
22, its working principle is that:
The turn-on and turn-off of known power switching device Q are controlled by the controller in power electronic equipment, and the application
Switching network circuit 21 need to device for power switching Q be connected when enter working condition, device for power switching Q shutdown when exit
Working condition, so switching network circuit 21 can also be controlled by the controller in power electronic equipment, thus and power switch
Device Q realizes synchronously control.
More specifically, controller control device for power switching Q conducting while, control switch lattice network 21 start into
Enter work, thus by electric energy that capacitor C is stored through isolating transformer T transformation, rectified unit 22 is released after rectifying to energy again
Recovery circuit (i.e. capacitor C realizes that energy is released by switching network circuit 21, isolating transformer T and rectification unit 22).It can be with
Understanding, the secondary voltage of isolating transformer T should be satisfied with the recycling demand voltage of energy recovering circuit, so the application
Controller should ensure that it in isolating transformer T transformation and rectification unit 22 in the output voltage of control switch lattice network 21
After rectification, the recycling demand voltage needed for it can be provided for energy recovering circuit.
In addition, isolating transformer T not only acts as the effect of the energy transmission between switching network circuit 21 and rectification unit 22；
Also electrical isolation can will be carried out between switching network circuit 21 and rectification unit 22, to eliminate two terminal adapter of isolating transformer T
The electrical correlation of part, the device for connecting the both ends isolating transformer T are independent of each other, and improve circuit safety.
Further, full bridge rectifier or Half bridge rectifier circuit or full-wave rectification can be selected in the rectification unit 22 of the application
Circuit or half-wave rectifying circuit, the application are not particularly limited herein.
Referring to figure 3., Fig. 3 is a kind of structural schematic diagram of soft switch circuit as shown in Figure 2 provided in an embodiment of the present invention.
As a kind of optionally embodiment, switching network circuit 21 is specially voltage conversion circuit；Controller is specifically used for
While controlling device for power switching Q conducting, the recycling of energy recovering circuit is satisfied in the secondary voltage of isolating transformer T
Under the constraint condition of demand voltage, control voltage conversion circuit starts to carry out voltage conversion, and the capacitor C electric energy stored is released
To subsequent conditioning circuit.
Specifically, voltage conversion circuit can be selected in the switching network circuit 21 of the application, and controller is in control power switch
While device Q is connected, control voltage conversion circuit initially enters voltage conversion operation, so that the capacitor C electric energy stored be let out
It puts and is finally embodied as energy recovering circuit to subsequent conditioning circuit recycling demand voltage needed for it is provided.
In addition, from figure 3, it can be seen that the rectification unit 22 of the present embodiment is using half-wave rectifying circuit (diode
D2)。
Referring to figure 4., Fig. 4 is another structural representation of soft switch circuit as shown in Figure 2 provided in an embodiment of the present invention
Figure.
As a kind of optionally embodiment, switching network circuit 21 includes wave generator circuit 211 and controllable switch K；Its
In:
Control terminal of the triggering end of wave generator circuit 211 as switching network circuit 21, the electricity of wave generator circuit 211
First end and third end of the source anode as switching network circuit 21, the power supply negative terminal and controllable switch K of wave generator circuit 211
First end connection and the second end as switching network circuit 21, the output end of wave generator circuit 211 and controllable switch K's
Control terminal connection, fourth end of the second end of controllable switch K as switching network circuit 21；Wherein, controllable switch K is specially and leads
Electric current flows to the switch of first end from second end when logical；
Controller is specifically used for while controlling device for power switching Q conducting, can using the driving of wave generator circuit 211
Control switch K is connected with a constant switching frequency, and the capacitor C electric energy stored is released to subsequent conditioning circuit.
Specifically, other than the switching network circuit 21 of the application circuit shown in Fig. 3, can also there are other circuit realization sides
Formula, as shown in figure 4, switching network circuit 21 includes wave generator circuit 211 and controllable switch K, its working principle is that:
Similarly, it is known that the turn-on and turn-off of device for power switching Q are controlled by the controller in power electronic equipment, and
The wave generator circuit 211 of the application need to enter working condition when device for power switching Q is connected, close in device for power switching Q
Working condition is exited when disconnected, so wave generator circuit 211 can also be controlled by the controller in power electronic equipment, thus with
Device for power switching Q realizes synchronously control.
More specifically, controller, while controlling device for power switching Q conducting, control wave generator circuit 211 starts
The driving signal of certain frequency is exported to controllable switch K, so that controllable switch K is under the driving of driving signal with certain switch
Frequency conducting.When controllable switch K conducting, the electric energy of capacitor C storage can pass through isolating transformer T and the (choosing of rectification unit 22
Being released with diode D2), (i.e. capacitor C is by the isolating transformer T and rectification list after electric wiring connection to energy recovering circuit
Member 22 realizes that energy is released).
As a kind of optionally embodiment, wave generator circuit 211 is specially high-frequency self-excitation oscillating circuit.
Specifically, high-frequency self-excitation oscillating circuit can be selected in the wave generator circuit 211 of the application, its working principle is that:
When triggering end input high level of the controller to high-frequency self-excitation oscillating circuit, high-frequency self-excitation oscillating circuit can enter
Working condition exports the square-wave signal of certain frequency；When controller is to the triggering end input low level of high-frequency self-excitation oscillating circuit
When, high-frequency self-excitation oscillating circuit can exit working condition, stop the square-wave signal of output certain frequency.
Correspondingly, high level conducting, low level shutdown or low level conducting, height can be selected in the controllable switch K of the application
The switch of level shutdown, to make controllable switch K under the square-wave signal that high-frequency self-excitation oscillating circuit exports with certain switch
Frequency conducting.
As one kind, optionally embodiment, controllable switch K are specially IGBT or MOSFET.
Specifically, IGBT can be selected in the controllable switch K of the application, and also optional MOSFET etc. is other types of controllably opens
It closes, the application is not particularly limited herein.However, it is desirable to explanation, when controllable switch K conducting, electric current is from second
End flows to first end, needs to meet this requirement when controllable switch K being arranged in circuit.
For example, when controllable switch K selects IGBT, second end of the collector of IGBT as controllable switch K, the hair of IGBT
First end of the emitter-base bandgap grading as controllable switch K, control terminal of the gate pole of IGBT as controllable switch K.
As a kind of optionally embodiment, energy recovering circuit is specially the power supply or electric power electricity of power electronic equipment
The DC bus of sub- equipment.
Specifically, the power supply (usually electrolytic capacitor) that the application can choose power electronic equipment is returned as energy
Circuit, i.e. positive terminal of the anode of power supply as energy recovering circuit are received, the cathode of power supply is as energy regenerating
The negative terminal of circuit.The application is also an option that the DC bus of power electronic equipment as energy recovering circuit, i.e. positive pole
Positive terminal of the line as energy recovering circuit, negative terminal of the negative busbar as energy recovering circuit.
It should be noted that the soft switch circuit of the application can be applied to any power electronics comprising device for power switching
In equipment, such as three-level inverter.Referring to figure 5., Fig. 5 is a kind of structure of three-level inverter provided in an embodiment of the present invention
Schematic diagram.It (is used from figure 5 it can be seen that the device for power switching Q1-Q4 of three-level inverter is respectively provided with a soft switch circuit
U1-U4 is indicated, any of the above-described kind of soft switch circuit can be used), to save the energy, and improve the work of three-level inverter
Make efficiency.
The present invention also provides a kind of power electronic equipment, including device for power switching, further includes any of the above-described kind and soft open
Powered-down road.
Fig. 6 is please referred to, Fig. 6 is a kind of structure of the soft switch circuit of more device for power switching provided in an embodiment of the present invention
Schematic diagram.
As a kind of optionally embodiment, when device for power switching Q is N number of, power electronic equipment includes that energy is released
Circuit 2 and N number of conduct current circuit 1, further include N number of counnter attack diode D3, and N is the integer greater than 1；Wherein:
In n-th of conduct current circuit 1, the first end of the anode of first diode D1 and n-th of device for power switching Q
Connection, the cathode of first diode D1 are connect with the anode of the first end of capacitor C and n-th of counnter attack diode D3 respectively, and n-th
The cathode of counnter attack diode D3 is connect with the cathode of energy leadage circuit 2 and remaining counnter attack diode D3 respectively, and the second of capacitor C
End is connect with the second end of n-th device for power switching Q and energy leadage circuit 2 respectively；Wherein, n=1,2 ... .N；
Energy leadage circuit 2 is specifically used for when any device for power switching Q conducting, this device for power switching Q is corresponding
Conduct current circuit 1 in capacitor C storage electric energy release to energy recovering circuit.
Specifically, when the device for power switching Q in power electronic equipment is multiple, in addition to each power switch shown in Fig. 5
Device is respectively provided with except a soft switch circuit, and multiple device for power switching Q can also share an energy leadage circuit 2, thus
Save the cost, as shown in fig. 6, need to the first diode D1 of each conduct current circuit 1 cathode and energy leadage circuit 2 it
Between increase counnter attack diode D3, to prevent between different conduct current circuits 1, capacitor C energy is counter to be filled.It should be noted that energy
The shared scheme of leadage circuit 2 is especially suitable in the case of multiple device for power switching Q are in parallel.
Other introductions of power electronic equipment provided by the present application please refer to the embodiment of above-mentioned soft switch circuit, the application
Details are not described herein.
It should also be noted that, in the present specification, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
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 without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of soft switch circuit characterized by comprising
The conduct current circuit being connected in parallel with device for power switching in power electronic equipment, for working as the device for power switching
When shutdown, the electric current for flowing into the device for power switching is imported into itself circuit, and the electric energy that the electric current generates is stored up
It deposits；
The energy vent discharge being connect respectively with the energy recovering circuit in the conduct current circuit and the power electronic equipment
Road, for the electric energy of the conduct current circuit storage being released to the energy and is returned when device for power switching conducting
Circuit is received, for power electronic equipment use.
2. soft switch circuit as described in claim 1, which is characterized in that the conduct current circuit include first diode and
Capacitor；Wherein:
The anode of the first diode is connect with the first end of the device for power switching, the cathode of the first diode with
The first end of the capacitor connects, and the second end of the capacitor is connect with the second end of the device for power switching；Wherein, described
Device for power switching is specially the device for power switching that electric current flows to second end from first end when being connected；
The capacitor is used to be directly entered charged state when device for power switching shutdown, the electricity that the electric current is generated
It can be carried out storage；
Correspondingly, the energy leadage circuit is specifically used for storing the capacitor when device for power switching conducting
Electric energy is released to the energy recovering circuit.
3. soft switch circuit as claimed in claim 2, which is characterized in that the energy leadage circuit include isolating transformer,
Switching network circuit and rectification unit；Wherein:
The first end of the switching network circuit is connect with the first end of the capacitor, the second end of the switching network circuit with
The second end of the capacitor connects, and the third end of the switching network circuit and the primary side first end of the isolating transformer connect
It connects, the 4th end of the switching network circuit is connect with the primary side second end of the isolating transformer, the switching network circuit
Control terminal connect with the controller in the power electronic equipment, the secondary side of the isolating transformer passes through the rectification unit
It is connect with the energy recovering circuit；Wherein, the secondary voltage of the isolating transformer is satisfied with the energy recovering circuit
Recycle demand voltage；
The controller is used to control the switching network circuit while controlling device for power switching conducting and start work
Make, so that the switching network circuit releases the electric energy that the capacitor stores to subsequent conditioning circuit.
4. soft switch circuit as claimed in claim 3, which is characterized in that the switching network circuit is specially voltage conversion electricity
Road；The controller is specifically used for while controlling device for power switching conducting, on the secondary side of the isolating transformer
Voltage is satisfied under the constraint condition of recycling demand voltage of the energy recovering circuit, controls the voltage conversion circuit and starts
Voltage conversion is carried out, the electric energy that the capacitor stores is released to subsequent conditioning circuit.
5. soft switch circuit as claimed in claim 3, which is characterized in that the switching network circuit includes wave generator circuit
And controllable switch；Wherein:
Control terminal of the triggering end of the wave generator circuit as the switching network circuit, the electricity of the wave generator circuit
First end and third end of the source anode as the switching network circuit, the power supply negative terminal of the wave generator circuit and it is described can
The first end of control switch connects and the second end as the switching network circuit, the output end of the wave generator circuit and institute
State the control terminal connection of controllable switch, fourth end of the second end of the controllable switch as the switching network circuit；Wherein,
The controllable switch is specially the switch that electric current flows to first end from second end when being connected；
The controller is specifically used for driving while controlling device for power switching conducting using the wave generator circuit
It moves the controllable switch to be connected with a constant switching frequency, the electric energy that the capacitor stores is released to subsequent conditioning circuit.
6. soft switch circuit as claimed in claim 5, which is characterized in that the wave generator circuit is specially high-frequency self-excitation vibration
Swing circuit.
7. soft switch circuit as claimed in claim 5, which is characterized in that the controllable switch is specially IGBT or MOSFET.
8. such as the described in any item soft switch circuits of claim 2-7, which is characterized in that the energy recovering circuit is specially institute
State the power supply of power electronic equipment or the DC bus of the power electronic equipment.
9. a kind of power electronic equipment, which is characterized in that further include such as any one of claim 2-8 including device for power switching
The soft switch circuit.
10. power electronic equipment as claimed in claim 9, which is characterized in that when the device for power switching is N number of, institute
Stating power electronic equipment includes the energy leadage circuit and N number of conduct current circuit, further includes N number of counnter attack diode, N
For the integer greater than 1；Wherein:
In n-th of conduct current circuit, the first end of the anode of first diode and n-th of device for power switching connects
It connects, the cathode of first diode is connect with the anode of the first end of capacitor and n-th of counnter attack diode respectively, n-th of counnter attack two
The cathode of pole pipe is connect with the cathode of the energy leadage circuit and remaining counnter attack diode respectively, the second end of capacitor respectively with
The second end of n-th of device for power switching Q is connected with the energy leadage circuit；Wherein, n=1,2 ... .N；
The energy leadage circuit is specifically used for when the conducting of any device for power switching, by the corresponding electricity of this device for power switching
The conductance electric energy that capacitor stores into circuit is released to the energy recovering circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910722909.0A CN110518789B (en) | 2019-08-06 | 2019-08-06 | Soft switching circuit and power electronic equipment |
| PCT/CN2020/077968 WO2021022809A1 (en) | 2019-08-06 | 2020-03-05 | Soft-switching circuit and power electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910722909.0A CN110518789B (en) | 2019-08-06 | 2019-08-06 | Soft switching circuit and power electronic equipment |
Publications (2)
| Publication Number | Publication Date |
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| CN110518789A true CN110518789A (en) | 2019-11-29 |
| CN110518789B CN110518789B (en) | 2022-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910722909.0A Active CN110518789B (en) | 2019-08-06 | 2019-08-06 | Soft switching circuit and power electronic equipment |
Country Status (2)
| Country | Link |
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| CN (1) | CN110518789B (en) |
| WO (1) | WO2021022809A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021022809A1 (en) * | 2019-08-06 | 2021-02-11 | 科华恒盛股份有限公司 | Soft-switching circuit and power electronic device |
| CN113937993A (en) * | 2021-09-18 | 2022-01-14 | 广州金升阳科技有限公司 | Shutdown energy recovery method and shutdown energy recovery circuit |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN110518789B (en) | 2022-02-25 |
| WO2021022809A1 (en) | 2021-02-11 |
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