CN106411105A - Soft-switching circuit topology based on charging and discharging of capacitor - Google Patents
Soft-switching circuit topology based on charging and discharging of capacitor Download PDFInfo
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- CN106411105A CN106411105A CN201610451264.8A CN201610451264A CN106411105A CN 106411105 A CN106411105 A CN 106411105A CN 201610451264 A CN201610451264 A CN 201610451264A CN 106411105 A CN106411105 A CN 106411105A
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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
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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
- H02M1/0048—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
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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
- 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
Abstract
The present invention relates to a soft-switching circuit topology based on charging and discharging of a capacitor. The soft-switching circuit topology comprises a main switch, one end of the main switch is connected with one end of the primary side of an auxiliary transformer, and the other end of the primary side of the auxiliary transformer is connected with one end of an auxiliary switch; and the other end of the auxiliary switch is connected with one end of an auxiliary capacitor and the anode of an auxiliary power supply, the other end of the auxiliary capacitor is connected with the cathode of the auxiliary power supply and the other end of the primary side of the auxiliary transformer. The present invention further discloses a method for controlling the control logic of the soft-switching circuit topology based on charging and discharging of the capacitor. The problems are effectively solved that the stress of the switching device is large, the soft switch is failed without the influence of the load and power supply changing, the control is complex and the selection of the parameters of a resonance device is difficult. According to the invention, the requirement of the device parameters is low, the control is simple, the device stress is small, and the application frequency range is wide, and the soft-switching circuit topology based on charging and discharging of the capacitor can be applied to the devices with electronic switch devices and power converter devices so as to effectively improve the power supply efficiency and reduce the system cost.
Description
Technical field
The present invention relates to the soft switch topology of electronic switch and control logic technical field are and in particular to the technology of a kind of electronic switching device no-voltage and zero current passing and no-voltage and zero-current switching.
Background technology
At present, the devices such as all kinds of Switching Power Supplies, inverter and frequency converter, electronic switching device majority is operated in hard switching state, it is turned on or off in the state of hard switching is voltage on electronic switching device and electric current is not zero, Sofe Switch is voltage on electronic switching device and electric current is to be turned on or off in the state of zero.Because the parasitic capacitance of electronic circuit and electronic devices and components and stray inductance act on, there is switch transition stage in electronic switching device, during conducting, electric current is gradually risen and progressively declined with voltage, and during disconnection, electric current is progressively declined and gradually risen with voltage.Transition stage voltage and the overlapping process of electric current, produce serious energy loss, lead to electronic switching device temperature to rise and energy efficiency declines.Sofe Switch achieves electronic switching device and switchs the energy minimization that transition stage electric current is overlapped with voltage, effectively reduces electronic switching device temperature rise and improves energy efficiency.
LC resonance or QRC quasi-resonance soft switch, switching frequency need to change with the change of load, and application has very big limitation.The QRC quasi-resonance soft switch increasing auxiliary switch determines FREQUENCY CONTROL although achieving, but load change or power source change all can lead to Sofe Switch to lose efficacy, and auxiliary switch is operated in hard switching state.Above-mentioned soft switch technique presence controls difficulty big and the defect high to resonating device parameter request, leads to application to be greatly limited.How to realize Sofe Switch not changed and affected by power supply and load？How to realize controlling simply and resonating device parameter request is low？How to realize main switch and auxiliary switch is Sofe Switch？Need more applicable soft switch technique, promote the application popularization of soft switch technique, improve efficiency further, realize more preferable economic worth.
Content of the invention
The primary and foremost purpose of the present invention is to provide one kind to have device parameter requirements low, controls simple, stresses of parts little, applying frequency wide ranges, the soft switch circuit topology based on capacitor charge and discharge that Sofe Switch is not subject to power supply and load change and lost efficacy.
For achieving the above object, present invention employs technical scheme below：A kind of soft switch circuit topology based on capacitor charge and discharge, including main switch, one terminates one end of the former limit of auxiliary transformer, its other end is connected with one end of auxiliary switch, the other end of auxiliary switch is connected with one end of auxiliary capacitor, the positive pole of accessory power supply respectively, and the other end of auxiliary capacitor is connected with the negative pole of accessory power supply, the other end of the former limit of auxiliary transformer respectively.
Also include main switch fly-wheel diode, main switch fly-wheel diode is in parallel with main switch.
Also include auxiliary switch fly-wheel diode, auxiliary switch fly-wheel diode is in parallel with auxiliary switch.
The secondary of described auxiliary transformer passes through rectifier and charges to auxiliary capacitor, and system power supply passes through current-limiting inductance to auxiliary capacitor boost charge.
Switch internal parasitic diode based on described main switch fly-wheel diode, or parallel connection outside diode.
Described auxiliary switch fly-wheel diode is auxiliary switch internal parasitic diode, or parallel connection outside diode；Auxiliary switch can not also use fly-wheel diode.
Described current-limiting inductance is connected in accessory power supply loop, and described current-limiting inductance is induction reactance device, impedance device, any one in capacitive reactance device；Or above-mentioned several combination of devices constitutes current-limiting inductance.
A kind of soft switch circuit topology based on capacitor charge and discharge, including main switch, its one end is connected with one end of auxiliary switch, its other end is connected with one end of auxiliary capacitor, the negative pole of accessory power supply respectively, one end of the former limit of another termination auxiliary transformer of auxiliary switch, the other end of auxiliary transformer former limit is connected with the other end of auxiliary capacitor, the positive pole of accessory power supply respectively.
Another object of the present invention is to provide a kind of control logic timing method of the soft switch circuit topology based on capacitor charge and discharge it is characterised in that：Main switch turns on and with the control logic sequential of auxiliary switch is：Auxiliary switch turns on the → delayed disconnection of main switch conducting → auxiliary switch in advance；Main switch disconnects and with the control logic sequential of auxiliary switch is：Auxiliary switch turns on the → delayed disconnection of main switch disconnection → auxiliary switch in advance.
The time of the advanced conducting of auxiliary switch, equal to or more than auxiliary switch from the time by the end of fully on needs；Main switch turns on, and auxiliary switch disconnects the time of needs from being conducting to, and adds main switch from the time by the end of fully on needs equal to or more than the time of the advanced conducting of auxiliary switch；Main switch disconnects, and auxiliary switch disconnects the time of needs from being conducting to, and adds main switch from the time being conducting to completely switched off needs equal to or more than the time of the advanced conducting of auxiliary switch；The complete discharge cycle of auxiliary capacitor is equal to or less than auxiliary switch from the time being conducting to disconnection, and is conducting to, equal to or more than auxiliary switch, the time that main switch is fully on or main switch is fully disconnected.
The discharge cycle of auxiliary capacitor by accessory power supply, current-limiting inductance, auxiliary transformer, auxiliary switch, main switch, power supply and load together decide on.
During auxiliary capacitor electric discharge, main switch no forward current and forward voltage, reverse near zero voltage.When auxiliary capacitor discharge current is equal to main switch operating current, no-voltage and zero current passing or shutoff simultaneously in achievable main switch.
Auxiliary transformer is interrupting pulse mode of operation, and electric current during auxiliary switch conducting is started from scratch linearly increasing；The complete discharge cycle of auxiliary capacitor is less than the turn-on cycle of auxiliary switch, electric capacity discharge off when auxiliary switch disconnects；Auxiliary switch is operated in the switching mode of zero current and no-voltage.
The energy of auxiliary capacitor electric discharge, is charged to power end by auxiliary transformer, or charges to load end, or charges to other loads.
Accessory power supply and auxiliary capacitor circuit in series current-limiting inductance, current-limiting inductance is used for controlling the electric current of auxiliary switch conducting bypass main switch, and the electric current controlling accessory power supply.
Main switch and auxiliary switch can use MOSFET, the electronic switching device such as IGBT, GTR, SIT, SITH, SCR, IPM, PIC or module.
Main switch and auxiliary switch can be packaged into a module.
Main switch occurs and drives to be packaged into integrated circuit with the signal of auxiliary switch.
As shown from the above technical solution, the present invention is compared with existing soft switch technique, and it is big to efficiently solve switching device stress, Sofe Switch easily loaded and power source change and lost efficacy, control problem complicated and that the selection of resonating device parameter is more difficult.The present invention has the features such as device parameter requirements are low, and control is simple, stresses of parts is little, applying frequency wide ranges, Sofe Switch was not lost efficacy by the change of power supply and load.The present invention is applied to all kinds of devices with electronic switching device and supply convertor device, can effectively improve power-efficient and economy more preferably.
Brief description
Fig. 1 is the soft switch circuit topology figure based on capacitor charge and discharge；
Fig. 2 is the soft switch circuit topology figure based on capacitor charge and discharge；
Fig. 3 is no external auxiliary power supply and the soft switch circuit topology figure based on capacitor charge and discharge；
Fig. 4 is no external auxiliary power supply and the soft switch circuit topology figure based on capacitor charge and discharge；
Fig. 5 is isolated auxiliary transformer and the soft switch circuit topology figure based on capacitor charge and discharge；
Fig. 6 is autocoupling type auxiliary transformer and the soft switch circuit topology figure based on capacitor charge and discharge；
Fig. 7 is the soft switch BUCK converter main circuit based on capacitor charge and discharge；
Fig. 8 is the soft switch BUCK-BOOST converter main circuit based on capacitor charge and discharge；
Fig. 9 is the Sofe Switch single-phase full bridge inverter main circuit based on capacitor charge and discharge；
In Fig. 1 to Fig. 9, 1 is main switch, 2 is auxiliary switch, 3 is auxiliary capacitor, 4 is auxiliary transformer, 5 is current-limiting inductance, 6 is accessory power supply, 7 is auxiliary transformer secondary, 8 is auxiliary transformer secondary rectifier, switched freewheel diode based on 9, 10 is system power supply, 11 is power input electric capacity, 12 is power output end electric capacity, 13 is energy storage inductor, 14 is power input positive pole, 15 is power input negative pole, 16 is power output end positive pole, 17 is power output end negative pole, 18 is energy storage inductor fly-wheel diode, 19 is energy storage inductor rectifier, 20 is output transformer.
Specific embodiment
In order to the architectural feature of the present invention and effect of being reached has a better understanding and awareness, in order to preferred embodiment and accompanying drawing cooperation detailed description, be described as follows：
The present invention provides 6 kinds of basic topological diagrams for reference and explanation, on this basis, can develop out more topological diagrams, but general principle is all identical.Meanwhile, the invention provides 3 kinds of basic application cases illustrate for reference, on this basis, more application processes can be deduced out, but general principle is all equally similar.
1 , the soft switch circuit topology figure based on capacitor charge and discharge：Including main switch 1, main switch fly-wheel diode 9, auxiliary switch 2, auxiliary capacitor 3, auxiliary transformer 4, accessory power supply 6.Described auxiliary switch 2 is connected with auxiliary capacitor 3, and auxiliary capacitor 3 is connected with auxiliary transformer former limit, and main switch 1 is in parallel with the auxiliary switch 2 connected and auxiliary transformer former limit；Accessory power supply 6 positive pole connects auxiliary capacitor 3 and auxiliary switch 2, and accessory power supply 6 negative pole connects auxiliary capacitor 3 and auxiliary transformer former limit；Main switch fly-wheel diode 9 is in parallel with main switch 1.
Main switch fly-wheel diode 9 can be substituted with the endoparasitic diode of main switch 1.
The energy of auxiliary capacitor 3 electric discharge, is charged to power end by auxiliary transformer secondary 7, or charges to load end, or charges to other loads.
Accessory power supply 6 charges to auxiliary capacitor 3.Auxiliary switch 2 turns on, and the current loop of auxiliary capacitor 3 electric discharge is：Auxiliary capacitor positive pole → auxiliary switch 2 → main switch 1 and main switch fly-wheel diode 9 → auxiliary transformer former limit → auxiliary capacitor negative pole connected in parallel.
Main switch 1 conducting and the signal control logic sequential of auxiliary switch 2:Conducting → main switch 1 turns on the → delayed disconnection of auxiliary switch 2 to auxiliary switch 2 in advance.Main switch 1 disconnects the signal control logic sequential with auxiliary switch 2:Conducting → main switch 1 disconnects the → delayed disconnection of auxiliary switch 2 to auxiliary switch 2 in advance.
2 , the soft switch circuit topology figure based on capacitor charge and discharge：Including main switch 1, main switch fly-wheel diode 9, auxiliary switch 2, auxiliary capacitor 3, auxiliary transformer 4, accessory power supply 6.Described auxiliary switch 2 is connected with auxiliary transformer former limit, and auxiliary transformer former limit is connected with auxiliary capacitor 3, and main switch 1 is in parallel with the auxiliary switch 2 connected and auxiliary capacitor 3；Accessory power supply 6 positive pole connects auxiliary capacitor 3 and auxiliary transformer former limit, and accessory power supply 6 negative pole connects auxiliary capacitor 3 and main switch 1；Main switch fly-wheel diode 9 is in parallel with main switch 1.
Main switch fly-wheel diode 9 can be substituted with the endoparasitic diode of main switch 1.
The energy of auxiliary capacitor 3 electric discharge, is charged to power end by auxiliary transformer secondary 7, or charges to load end, or charges to other loads.
Accessory power supply 6 charges to auxiliary capacitor 3.Auxiliary switch 2 turns on, and the current loop of auxiliary capacitor 3 electric discharge is：Auxiliary capacitor positive pole → auxiliary transformer former limit → auxiliary switch 2 → main switch 1 and main switch fly-wheel diode 9 → auxiliary capacitor negative pole connected in parallel.
Main switch 1 conducting and the signal control logic sequential of auxiliary switch 2:Conducting → main switch 1 turns on the → delayed disconnection of auxiliary switch 2 to auxiliary switch 2 in advance.Main switch 1 disconnects the signal control logic sequential with auxiliary switch 2:Conducting → main switch 1 disconnects the → delayed disconnection of auxiliary switch 2 to auxiliary switch 2 in advance.
3 , no external auxiliary power supply 6 and the soft switch circuit topology figure based on capacitor charge and discharge：Including main switch 1, main switch fly-wheel diode 9, auxiliary switch 2, auxiliary capacitor 3, auxiliary transformer 4, auxiliary transformer secondary rectifier 8.Described auxiliary switch 2 is connected with auxiliary capacitor 3, and auxiliary capacitor 3 is connected with auxiliary transformer former limit, and main switch 1 is in parallel with the auxiliary switch 2 connected and auxiliary transformer former limit；Auxiliary transformer secondary 7 is connected with auxiliary capacitor 3 by auxiliary transformer secondary rectifier 8；Main switch fly-wheel diode 9 is in parallel with main switch 1.
Main switch fly-wheel diode 9 can be substituted with the endoparasitic diode of main switch 1.
The energy of auxiliary capacitor 3 electric discharge, is fed back by auxiliary transformer secondary 7 and charges to auxiliary capacitor 3；Auxiliary transformer 4 is operated in flyback mode；System power supply 10 supplements the energy of loss to auxiliary capacitor 3 by current-limiting inductance 5.
Accessory power supply 6 charges to auxiliary capacitor 3.Auxiliary switch 2 turns on, and the current loop of auxiliary capacitor 3 electric discharge is：Auxiliary capacitor positive pole → auxiliary switch 2 → main switch 1 and main switch fly-wheel diode 9 → auxiliary transformer former limit → auxiliary capacitor negative pole connected in parallel.
Main switch 1 conducting and the signal control logic sequential of auxiliary switch 2:Conducting → main switch 1 turns on the → delayed disconnection of auxiliary switch 2 to auxiliary switch 2 in advance.Main switch 1 disconnects the signal control logic sequential with auxiliary switch 2:Conducting → main switch 1 disconnects the → delayed disconnection of auxiliary switch 2 to auxiliary switch 2 in advance.
4 , no external auxiliary power supply 6 and the soft switch circuit topology figure based on capacitor charge and discharge：Including main switch 1, main switch fly-wheel diode 9, auxiliary switch 2, auxiliary capacitor 3, auxiliary transformer 4, auxiliary transformer secondary rectifier 8.Described auxiliary switch 2 is connected with auxiliary transformer former limit, and auxiliary transformer former limit is connected with auxiliary capacitor 3, and main switch 1 is in parallel with the auxiliary switch 2 connected and auxiliary capacitor 3；Auxiliary transformer secondary 7 is connected with auxiliary capacitor 3 by auxiliary transformer secondary rectifier 8；Main switch fly-wheel diode 9 is in parallel with main switch 1.
Main switch fly-wheel diode 9 can be substituted with the endoparasitic diode of main switch 1.
The energy of auxiliary capacitor 3 electric discharge, is fed back by auxiliary transformer secondary 7 and charges to auxiliary capacitor 3；Auxiliary transformer 4 is operated in flyback mode；System power supply 10 supplements the energy of loss to auxiliary capacitor 3 by current-limiting inductance 5.
Accessory power supply 6 charges to auxiliary capacitor 3.Auxiliary switch 2 turns on, and the current loop of auxiliary capacitor 3 electric discharge is：Auxiliary capacitor positive pole → auxiliary transformer former limit → auxiliary switch 2 → main switch 1 and main switch fly-wheel diode 9 → auxiliary capacitor negative pole connected in parallel.
Main switch 1 conducting and the signal control logic sequential of auxiliary switch 2:Conducting → main switch 1 turns on the → delayed disconnection of auxiliary switch 2 to auxiliary switch 2 in advance.Main switch 1 disconnects the signal control logic sequential with auxiliary switch 2:Conducting → main switch 1 disconnects the → delayed disconnection of auxiliary switch 2 to auxiliary switch 2 in advance.
5 , isolated auxiliary transformer 4 and the soft switch circuit topology figure based on capacitor charge and discharge:Including main switch 1, main switch fly-wheel diode 9, auxiliary switch 2, auxiliary capacitor 3, auxiliary transformer 4, accessory power supply 6, current-limiting inductance 5.Described auxiliary switch 2 is connected with auxiliary capacitor 3, and auxiliary capacitor 3 is connected with auxiliary transformer former limit, and main switch 1 is in parallel with the auxiliary switch 2 connected and auxiliary transformer former limit；Accessory power supply 6 positive pole connects auxiliary capacitor 3 and auxiliary switch 2 by current-limiting inductance 5, and accessory power supply 6 negative pole connects auxiliary capacitor 3 and auxiliary transformer former limit；Main switch fly-wheel diode 9 is in parallel with main switch 1.
Main switch fly-wheel diode 9 can be substituted with the endoparasitic diode of main switch 1.
The energy of auxiliary capacitor 3 electric discharge, is charged to power end by auxiliary transformer secondary 7, or charges to load end, or charges to other loads.
Accessory power supply 6 charges to auxiliary capacitor 3.Auxiliary switch 2 turns on, and the current loop of auxiliary capacitor 3 electric discharge is：Auxiliary capacitor positive pole → auxiliary switch 2 → main switch 1 and main switch fly-wheel diode 9 → auxiliary transformer former limit → auxiliary capacitor negative pole connected in parallel.
Main switch 1 conducting and the signal control logic sequential of auxiliary switch 2:Conducting → main switch 1 turns on the → delayed disconnection of auxiliary switch 2 to auxiliary switch 2 in advance.Main switch 1 disconnects the signal control logic sequential with auxiliary switch 2:Conducting → main switch 1 disconnects the → delayed disconnection of auxiliary switch 2 to auxiliary switch 2 in advance.
6 , isolated auxiliary transformer 4 and the soft switch circuit topology figure based on capacitor charge and discharge:Including main switch 1, main switch fly-wheel diode 9, auxiliary switch 2, auxiliary capacitor 3, auxiliary transformer 4, accessory power supply 6, current-limiting inductance 5.Described auxiliary switch 2 is connected with auxiliary capacitor 3, and auxiliary capacitor 3 is connected with auxiliary transformer 4, and main switch 1 is in parallel with the auxiliary switch 2 connected and auxiliary transformer 4；Accessory power supply 6 positive pole connects auxiliary capacitor 3 and auxiliary switch 2 by current-limiting inductance 5, and accessory power supply 6 negative pole connects auxiliary capacitor 3 and auxiliary transformer 4；Main switch fly-wheel diode 9 is in parallel with main switch 1.
Main switch fly-wheel diode 9 can be substituted with the endoparasitic diode of main switch 1.
The energy of auxiliary capacitor 3 electric discharge, is charged to power end by autocoupling type auxiliary transformer 4, or charges to load end, or charges to other loads.
Accessory power supply 6 charges to auxiliary capacitor 3.Auxiliary switch 2 turns on, and the current loop of auxiliary capacitor 3 electric discharge is：Auxiliary capacitor positive pole → auxiliary switch 2 → main switch 1 and main switch fly-wheel diode 9 → auxiliary transformer, 4 → auxiliary capacitor negative pole connected in parallel.
Main switch 1 conducting and the signal control logic sequential of auxiliary switch 2:Conducting → main switch 1 turns on the → delayed disconnection of auxiliary switch 2 to auxiliary switch 2 in advance.Main switch 1 disconnects the signal control logic sequential with auxiliary switch 2:Conducting → main switch 1 disconnects the → delayed disconnection of auxiliary switch 2 to auxiliary switch 2 in advance.
7 , the soft switch BUCK converter main circuit based on capacitor charge and discharge:Including main switch 1, main switch fly-wheel diode 9, auxiliary switch 2, auxiliary capacitor 3, auxiliary transformer 4, auxiliary transformer secondary rectifier 8, power input electric capacity 11, power output end electric capacity 12, power input positive pole 14, power input negative pole 15, power output end positive pole 16, power output end negative pole 17, energy storage inductor 13, energy storage inductor fly-wheel diode 18.Described main switch 1 emitter stage is connected with auxiliary switch 2 emitter stage and power input negative pole 15, and main switch 1 colelctor electrode is connected with energy storage inductor 13 and energy storage inductor fly-wheel diode 18 anode and auxiliary transformer former limit；Auxiliary switch 2 colelctor electrode is connected with auxiliary capacitor 3 and current-limiting inductance 5 and auxiliary transformer secondary rectifier 8, and auxiliary capacitor 3 is connected with auxiliary transformer former limit and auxiliary transformer secondary 7；Auxiliary transformer secondary 7 is connected with auxiliary capacitor 3 by auxiliary transformer secondary rectifier 8；The negative electrode of energy storage inductor fly-wheel diode 18 is connected with power input positive pole 14 and power output end positive pole 16；Main switch fly-wheel diode 9 is in parallel with main switch 1.
The energy of auxiliary capacitor 3 electric discharge, is fed back by auxiliary transformer secondary 7 and charges to auxiliary capacitor 3；Auxiliary transformer 4 is operated in flyback mode；Power input positive pole 14 supplements the energy of loss to auxiliary capacitor 3 by current-limiting inductance 5.
Accessory power supply 6 charges to auxiliary capacitor 3.Auxiliary switch 2 turns on, and the current loop of auxiliary capacitor 3 electric discharge is：Auxiliary capacitor positive pole → auxiliary switch 2 → main switch 1 and main switch fly-wheel diode 9 → auxiliary transformer former limit → auxiliary capacitor negative pole connected in parallel.
Main switch 1 conducting and the signal control logic sequential of auxiliary switch 2:Conducting → main switch 1 turns on the → delayed disconnection of auxiliary switch 2 to auxiliary switch 2 in advance.Main switch 1 disconnects the signal control logic sequential with auxiliary switch 2:Conducting → main switch 1 disconnects the → delayed disconnection of auxiliary switch 2 to auxiliary switch 2 in advance.
The time that auxiliary switch 2 turns in advance, equal to or more than auxiliary switch 2 from the time by the end of fully on needs.Main switch 1 turns on, and auxiliary switch 2 disconnects the time of needs from being conducting to, and adds main switch 1 from the time by the end of fully on needs equal to or more than the time that auxiliary switch 2 turns in advance.Main switch 1 disconnects, and auxiliary switch 2 disconnects the time of needs from being conducting to, and adds main switch 1 from the time being conducting to completely switched off needs equal to or more than the time that auxiliary switch 2 turns in advance.
The complete discharge cycle of auxiliary capacitor 3 is equal to or less than auxiliary switch 2 from the time being conducting to disconnection, and is conducting to, equal to or more than auxiliary switch 2, the time that main switch 1 is fully on or main switch 1 is fully disconnected.The discharge cycle of auxiliary capacitor 3 by accessory power supply 6, current-limiting inductance 5, auxiliary transformer 4, auxiliary switch 2, main switch 1, power supply and load together decide on.
During auxiliary capacitor 3 electric discharge, main switch 1 no forward current and forward voltage, reverse near zero voltage.When auxiliary capacitor 3 discharge current is equal to main switch 1 operating current, no-voltage and zero current passing or shutoff simultaneously in achievable main switch 1.
Adjustment auxiliary transformer 4 and the reactance corresponding relation of current-limiting inductance 5 and load and power supply, the discharge current of achievable auxiliary capacitor 3 is equal to the operating current of main switch 1.
Auxiliary transformer 4 is interrupting pulse mode of operation, and electric current during auxiliary switch 2 conducting is started from scratch linearly increasing；The complete discharge cycle of auxiliary capacitor 3 is less than the turn-on cycle of auxiliary switch 2, electric capacity discharge off when auxiliary switch 2 disconnects；Auxiliary switch 2 is operated in the switching mode of zero current and no-voltage.
Main switch fly-wheel diode 9 can be substituted with the endoparasitic diode of main switch 1.
8 , the soft switch BUCK based on capacitor charge and discharge-BOOST converter main circuit:Including main switch 1, main switch fly-wheel diode 9, auxiliary switch 2, auxiliary capacitor 3, auxiliary transformer 4, auxiliary transformer secondary rectifier 8, power input electric capacity 11, power output end electric capacity 12, power input positive pole 14, power input negative pole 15, power output end positive pole 16, power output end negative pole 17, energy storage inductor 13, energy storage inductor fly-wheel diode 18, energy storage inductor rectifier 19.Described main switch 1 emitter stage is connected with auxiliary switch 2 emitter stage and power input negative pole 15, and main switch 1 colelctor electrode is connected with energy storage inductor 13 and energy storage inductor fly-wheel diode 18 anode and auxiliary transformer former limit；Auxiliary switch 2 colelctor electrode is connected with auxiliary capacitor 3 and current-limiting inductance 5, and auxiliary capacitor 3 is connected with auxiliary transformer former limit and energy storage inductor rectifier 19 anode；Auxiliary transformer secondary 7 is connected with power output end electric capacity 12 by auxiliary transformer secondary rectifier 8；The negative electrode of energy storage inductor fly-wheel diode 18 is connected with power output end positive pole 16 and power output end electric capacity 12；Main switch fly-wheel diode 9 is in parallel with main switch 1.
The energy of auxiliary capacitor 3 electric discharge, is charged to power output end electric capacity 12 by auxiliary transformer secondary 7.Energy storage inductor rectifier 19 is connected with energy storage inductor 13 assists winding, and energy storage inductor rectifier 19 negative electrode is charged to auxiliary capacitor 3 by current-limiting inductance 5.
Accessory power supply 6 charges to auxiliary capacitor 3.Auxiliary switch 2 turns on, and the current loop of auxiliary capacitor 3 electric discharge is：Auxiliary capacitor positive pole → auxiliary switch 2 → main switch 1 and main switch fly-wheel diode 9 → auxiliary transformer former limit → auxiliary capacitor negative pole connected in parallel.
Main switch 1 conducting and the signal control logic sequential of auxiliary switch 2:Conducting → main switch 1 turns on the → delayed disconnection of auxiliary switch 2 to auxiliary switch 2 in advance.Main switch 1 disconnects the signal control logic sequential with auxiliary switch 2:Conducting → main switch 1 disconnects the → delayed disconnection of auxiliary switch 2 to auxiliary switch 2 in advance.
The time that auxiliary switch 2 turns in advance, equal to or more than auxiliary switch 2 from the time by the end of fully on needs.Main switch 1 turns on, and auxiliary switch 2 disconnects the time of needs from being conducting to, and adds main switch 1 from the time by the end of fully on needs equal to or more than the time that auxiliary switch 2 turns in advance.Main switch 1 disconnects, and auxiliary switch 2 disconnects the time of needs from being conducting to, and adds main switch 1 from the time being conducting to completely switched off needs equal to or more than the time that auxiliary switch 2 turns in advance.
The complete discharge cycle of auxiliary capacitor 3 is equal to or less than auxiliary switch 2 from the time being conducting to disconnection, and is conducting to, equal to or more than auxiliary switch 2, the time that main switch 1 is fully on or main switch 1 is fully disconnected.The discharge cycle of auxiliary capacitor 3 by accessory power supply 6, current-limiting inductance 5, auxiliary transformer 4, auxiliary switch 2, main switch 1, power supply and load together decide on.
During auxiliary capacitor 3 electric discharge, main switch 1 no forward current and forward voltage, reverse near zero voltage.When auxiliary capacitor 3 discharge current is equal to main switch 1 operating current, no-voltage and zero current passing or shutoff simultaneously in achievable main switch 1.
Adjustment auxiliary transformer 4 and the reactance corresponding relation of current-limiting inductance 5 and load and power supply, the discharge current of achievable auxiliary capacitor 3 is equal to the operating current of main switch 1.
Auxiliary transformer 4 is interrupting pulse mode of operation, and electric current during auxiliary switch 2 conducting is started from scratch linearly increasing；The complete discharge cycle of auxiliary capacitor 3 is less than the turn-on cycle of auxiliary switch 2, electric capacity discharge off when auxiliary switch 2 disconnects；Auxiliary switch 2 is operated in the switching mode of zero current and no-voltage.
Main switch fly-wheel diode 9 can be substituted with the endoparasitic diode of main switch 1.
9 , the Sofe Switch single-phase full bridge inverter main circuit based on capacitor charge and discharge：Four main switches 1 are connected into two strings, and 2 colelctor electrodes of two groups of series connection main switches 1 are connected with power input positive pole 14, and 2 emitter stages of two groups of series connection main switches 1 are connected with power input negative pole 15；The collector and emitter of two string main switches 1 is connected with output transformer 20 former limit respectively.
4 main switch 1 emitter stages are connected with 4 auxiliary switch 2 emitter stages respectively；4 auxiliary switch 2 colelctor electrodes are connected with 4 auxiliary capacitors 3 respectively；4 auxiliary capacitors 3 are connected with 4 auxiliary transformer former limits respectively；4 auxiliary transformer former limits are connected with 4 main switch 1 colelctor electrodes respectively；4 main switch fly-wheel diodes 9 are in parallel with 4 main switches 1 respectively.
Each soft switch circuit operation principle is as follows respectively：
The energy of auxiliary capacitor 3 electric discharge, is charged to power end by auxiliary transformer secondary 7, or charges to load end, or charges to other loads.
Accessory power supply 6 charges to auxiliary capacitor 3.Auxiliary switch 2 turns on, and the current loop of auxiliary capacitor 3 electric discharge is：Auxiliary capacitor positive pole → auxiliary switch 2 → main switch 1 and main switch fly-wheel diode 9 → auxiliary transformer former limit → auxiliary capacitor negative pole connected in parallel.
Main switch 1 conducting and the signal control logic sequential of auxiliary switch 2:Conducting → main switch 1 turns on the → delayed disconnection of auxiliary switch 2 to auxiliary switch 2 in advance.Main switch 1 disconnects the signal control logic sequential with auxiliary switch 2:Conducting → main switch 1 disconnects the → delayed disconnection of auxiliary switch 2 to auxiliary switch 2 in advance.
The time that auxiliary switch 2 turns in advance, equal to or more than auxiliary switch 2 from the time by the end of fully on needs.Main switch 1 turns on, and auxiliary switch 2 disconnects the time of needs from being conducting to, and adds main switch 1 from the time by the end of fully on needs equal to or more than the time that auxiliary switch 2 turns in advance.Main switch 1 disconnects, and auxiliary switch 2 disconnects the time of needs from being conducting to, and adds main switch 1 from the time being conducting to completely switched off needs equal to or more than the time that auxiliary switch 2 turns in advance.
The complete discharge cycle of auxiliary capacitor 3 is equal to or less than auxiliary switch 2 from the time being conducting to disconnection, and is conducting to, equal to or more than auxiliary switch 2, the time that main switch 1 is fully on or main switch 1 is fully disconnected.The discharge cycle of auxiliary capacitor 3 by accessory power supply 6, auxiliary transformer 4, auxiliary switch 2, main switch 1, power supply and load together decide on.
During auxiliary capacitor 3 electric discharge, main switch 1 no forward current and forward voltage, reverse near zero voltage.When auxiliary capacitor 3 discharge current is equal to main switch 1 operating current, no-voltage and zero current passing or shutoff simultaneously in achievable main switch 1.
Adjustment auxiliary transformer 4 and the corresponding relation of accessory power supply 6 and load and power supply, the discharge current of achievable auxiliary capacitor 3 is equal to the operating current of main switch 1.
Auxiliary transformer 4 is interrupting pulse mode of operation, and electric current during auxiliary switch 2 conducting is started from scratch linearly increasing；The complete discharge cycle of auxiliary capacitor 3 is less than the turn-on cycle of auxiliary switch 2, electric capacity discharge off when auxiliary switch 2 disconnects；Auxiliary switch 2 is operated in the switching mode of zero current and no-voltage.
Main switch fly-wheel diode 9 can be substituted with the endoparasitic diode of main switch 1.
The secondary of output transformer 20 is to load output energy.
General principle, principal character and the advantages of the present invention of the present invention have been shown and described above.It should be understood by those skilled in the art that; the present invention is not restricted to the described embodiments; the principle of the simply present invention described in above-described embodiment and specification; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements both fall within the range of claimed invention.The protection domain of application claims is defined by appending claims and its equivalent.
Claims (10)
1. a kind of soft switch circuit topology based on capacitor charge and discharge it is characterised in that：Including main switch, one terminates one end of the former limit of auxiliary transformer, its other end is connected with one end of auxiliary switch, the other end of auxiliary switch is connected with one end of auxiliary capacitor, the positive pole of accessory power supply respectively, and the other end of auxiliary capacitor is connected with the negative pole of accessory power supply, the other end of the former limit of auxiliary transformer respectively.
2. the soft switch circuit topology based on capacitor charge and discharge according to claim 1 it is characterised in that：Also include main switch fly-wheel diode, main switch fly-wheel diode is in parallel with main switch.
3. the soft switch circuit topology based on capacitor charge and discharge according to claim 1 it is characterised in that：Also include auxiliary switch fly-wheel diode, auxiliary switch fly-wheel diode is in parallel with auxiliary switch.
4. the soft switch circuit topology based on capacitor charge and discharge according to claim 1 it is characterised in that：The secondary of described auxiliary transformer passes through rectifier and charges to auxiliary capacitor, and system power supply passes through current-limiting inductance to auxiliary capacitor boost charge.
5. the soft switch circuit topology based on capacitor charge and discharge according to claim 2 it is characterised in that：Switch internal parasitic diode based on described main switch fly-wheel diode.
6. the soft switch circuit topology based on capacitor charge and discharge according to claim 3 it is characterised in that：Described auxiliary switch fly-wheel diode is auxiliary switch internal parasitic diode.
7. the soft switch circuit topology based on capacitor charge and discharge according to claim 4 it is characterised in that：Described current-limiting inductance is connected in accessory power supply loop, and described current-limiting inductance is induction reactance device, impedance device, any one in capacitive reactance device.
8. a kind of soft switch circuit topology based on capacitor charge and discharge it is characterised in that：Including main switch, its one end is connected with one end of auxiliary switch, its other end is connected with one end of auxiliary capacitor, the negative pole of accessory power supply respectively, one end of the former limit of another termination auxiliary transformer of auxiliary switch, the other end of auxiliary transformer former limit is connected with the other end of auxiliary capacitor, the positive pole of accessory power supply respectively.
9. a kind of control logic timing method of the soft switch circuit topology based on capacitor charge and discharge as any one of claim 1 to 8 it is characterised in that：Main switch turns on and with the control logic sequential of auxiliary switch is：Auxiliary switch turns on the → delayed disconnection of main switch conducting → auxiliary switch in advance；Main switch disconnects and with the control logic sequential of auxiliary switch is：Auxiliary switch turns on the → delayed disconnection of main switch disconnection → auxiliary switch in advance.
10. control logic timing method according to claim 9 it is characterised in that：The time of the advanced conducting of auxiliary switch, equal to or more than auxiliary switch from the time by the end of fully on needs；Main switch turns on, and auxiliary switch disconnects the time of needs from being conducting to, and adds main switch from the time by the end of fully on needs equal to or more than the time of the advanced conducting of auxiliary switch；Main switch disconnects, and auxiliary switch disconnects the time of needs from being conducting to, and adds main switch from the time being conducting to completely switched off needs equal to or more than the time of the advanced conducting of auxiliary switch；The complete discharge cycle of auxiliary capacitor is equal to or less than auxiliary switch from the time being conducting to disconnection, and is conducting to, equal to or more than auxiliary switch, the time that main switch is fully on or main switch is fully disconnected.
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| CN106411105B (en) | 2019-03-15 |
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