CN104333231A - LCC serial-parallel resonant power supply and method for increasing switching frequency by power supply - Google Patents
LCC serial-parallel resonant power supply and method for increasing switching frequency by power supply Download PDFInfo
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- CN104333231A CN104333231A CN201410602773.7A CN201410602773A CN104333231A CN 104333231 A CN104333231 A CN 104333231A CN 201410602773 A CN201410602773 A CN 201410602773A CN 104333231 A CN104333231 A CN 104333231A
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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
- 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
- H02M3/338—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 in a self-oscillating arrangement
- H02M3/3381—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 in a self-oscillating arrangement using a single commutation path
-
- 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
- H02M3/338—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 in a self-oscillating arrangement
- H02M3/3385—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 in a self-oscillating arrangement with automatic control of output voltage or current
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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 invention discloses an LCC serial-parallel resonant power supply and a method for increasing switching frequency by the power supply. The LCC serial-parallel resonant power supply comprises a full-bridge rectifier circuit, a filter capacitor assembly, a full-bridge inverter circuit, an LCC serial-parallel resonant circuit, a main power transformer T1, a high voltage rectifier assembly, a high voltage energy storage filter capacitor C11 and a resistor assembly. According to the power supply, by the aid of the soft-switching technology and the LCC serial-parallel resonant circuit, a power switching tube in the full-bridge inverter circuit is switched on and off under the condition of zero voltage, the switching frequency of the power switching tube is increased, switching loss is decreased, switching noise is reduced, and power efficiency is improved.
Description
Technical field
The present invention relates to power technique fields, be specifically related to a kind of LCC series parallel resonance power supply and utilize it to improve the method for switching frequency.
Background technology
High voltage source is the important component part of transmitter, and it often determines reliability and volume, the weight of transmitter, and the quality of its performance is directly connected to radio-frequency quality and the life-span of transmitter, affects the performance of transmitter.
Conventional high-tension power supply many employings IGBT (Insulated Gate Bipolar Transistor, igbt) as switching device, switching frequency is general not high, current tail phenomenon is there is when IGBT turns off simultaneously, produce larger turn-off power loss, therefore high voltage source works in discontinous mode (DCM) more, IGBT is made to turn off to reduce turn-off power loss under zero current condition, but the high voltage source worked under DCM pattern adopts variable frequency control, its switching frequency under zero load and underloading condition is down to several hertz to tens hertz, output ripple is caused to become large, although increase output filter capacitor can reduce ripple, but the failure energy too increased during transmitting tube sparking, affect the reliability of transmitter, power volume can be increased simultaneously.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of LCC series parallel resonance power supply and adopts it to improve the method for switching frequency, by LCC series parallel resonance circuit, make the power switch pipe turn-on and turn-off under zero voltage condition in full bridge inverter, improve switching frequency, reduce switching loss, reduce switch noise, improve power-efficient.
The technical scheme that the present invention solves the problems of the technologies described above is as follows:
According to one aspect of the present invention, the invention provides a kind of LCC series parallel resonance power supply, it comprises full bridge rectifier (1), filter capacitor component (3), full bridge inverter (4), LCC series parallel resonance circuit (5) and main power transformer TI, high-voltage rectification assembly (6) and high-voltage energy storage filter capacitor C11 and resistor assembly (7);
Described full bridge rectifier (1), described filter capacitor component (3) and described full bridge inverter (4) are in parallel successively, the output of described full bridge inverter (4) is connected with the input of described resonant capacitance assembly (5), the output of described resonant capacitance assembly (5) is connected with the primary circuit of main power transformer T1, the secondary circuit of described main power transformer T1 is connected with the input of described high-voltage rectification assembly (6), the output of described high-voltage rectification assembly (6) is connected with the input of high-voltage energy storage filter capacitor C11, the output of described high-voltage energy storage filter capacitor C11 is connected with the input of described resistor assembly (7), and described high-voltage rectification assembly (6), one end ground connection of high-voltage energy storage filter capacitor C11 and resistor assembly (7),
Described full bridge rectifier (1) is three-phase bridge rectification circuit, is pulsating dc voltage by three-phase alternating current electric rectification;
Pulsating dc voltage after described full bridge rectifier (1) rectification is filtered into level and smooth direct voltage by described filter capacitor component (3);
Level and smooth direct voltage after described filter capacitor component (3) filtering is converted into high-frequency ac square-wave voltage by described full bridge inverter (4);
Described LCC series parallel resonance circuit (5) and main power transformer T1 carry out boosting process to described high-frequency ac square-wave voltage;
Ac square-wave voltage rectification after described boosting is high-pressure pulsating direct voltage by described high-voltage rectification assembly (6);
High-pressure pulsating direct voltage is filtered into smooth dc voltage through high-voltage energy storage filter capacitor C11 and exports;
Described resistor assembly (7) is sampled for the direct voltage exported described high-voltage energy storage filter capacitor C11.
According to another aspect of the present invention, provide a kind of method improving switching frequency, comprising:
Three-phase alternating current electric rectification is be filtered into level and smooth direct voltage through filter capacitor component (3) after pulsating dc voltage by full bridge rectifier (1);
Described filtered smooth dc voltage is after full bridge inverter (4) is converted into the ac square-wave voltage of high frequency, and it carries out boosting process through LCC series parallel resonance circuit (5) and main power transformer T1 again, obtains high-voltage alternating square wave;
The rectification of described high-voltage alternating square wave is after high-pressure pulsating direct voltage by high-voltage rectification assembly (6);
Described high-pressure pulsating direct current is filtered into smooth dc voltage through high-voltage energy storage filter capacitor C11 and exports, and resistor assembly (7) smooth dc voltage to this output is sampled.
A kind of LCC series parallel resonance power supply provided by the invention and adopt it to improve the method for switching frequency, this power acquisition soft switch technique, by LCC series parallel resonance circuit, make the power switch pipe turn-on and turn-off under zero voltage condition in full bridge inverter, improve switching frequency, reduce switching loss, reduce switch noise, improve power-efficient.
Accompanying drawing explanation
Fig. 1 is a kind of LCC series parallel resonance power sourced electric theory diagram of the embodiment of the present invention one;
Fig. 2 is a kind of method flow diagram improving switching frequency of the embodiment of the present invention two.
In accompanying drawing, the list of parts representated by each label is as follows:
1 is full bridge rectifier, and 2 is slow start circuit, and 3 is filter capacitor component, and 4 is full bridge inverter; 5 is resonant capacitance assembly, and 6 is high-voltage rectification assembly, and 7 is resistor assembly, and 8 is Control protection plate; 9 is driver module, and 10 is voltage source plate, and 11 is current transformer.
Embodiment
Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.
Embodiment one, a kind of LCC series parallel resonance power supply.Below in conjunction with Fig. 1, the power supply that the present embodiment provides is described.
See Fig. 1, it is the LCC series parallel resonance power sourced electric theory diagram of the present embodiment.This power supply is made up of full bridge rectifier 1, filter capacitor component 3, full bridge inverter 4, LCC series parallel resonance circuit 5 and main power transformer T1, high-voltage rectification assembly 6, high-voltage energy storage filter capacitor C11 and resistor assembly 7.Wherein, full bridge rectifier 1, filter capacitor component 3 and full bridge inverter 4 in parallel successively, the output of full bridge inverter 4 is connected with the input of resonant capacitance assembly 5, the output of resonant capacitance assembly 5 is connected with the primary circuit of main power transformer T1, the secondary circuit of main power transformer T1 is connected with the input of described high-voltage rectification assembly 6, the output of high-voltage rectification assembly 6 is connected with the input of high-voltage energy storage filter capacitor C11, the output of high-voltage energy storage filter capacitor C11 is connected with the input of described resistor assembly 7, and high-voltage rectification assembly 6, one end ground connection of high-voltage energy storage filter capacitor C11 and resistor assembly 7.Full bridge rectifier 1 is three-phase bridge rectification circuit, be divided into three groups by diode D1-D6 to compose in parallel, diode D1-D6 adopts the diode of IXYS company DSEI2*101-06A, is mainly the pulsating dc voltage of about 280V by the three-phase alternating current electric rectification of 200V/400Hz.280V pulsating dc voltage after over commutation is filtered into level and smooth direct voltage through filter capacitor component 3, and filter capacitor component 3 composes in parallel primarily of the electrolytic capacitor C1-C8 of 8 450V/220uF.The direct voltage that the filtered 280V of capacitance component 3 is level and smooth is after filtering converted into the ac square-wave voltage of high frequency through the full bridge inverter 4 be made up of power switch pipe V1-V4.Wherein, power switch pipe V1 and V3 series connection formation branch road, V2 and V4 series connection forms another branch road, and then these two branch roads are in parallel again forms full bridge inverter 4.Power switch pipe V1-V4 is composed in parallel by 4 IXYS company IXFN82N60P respectively, and power switch pipe V1-V4 adopts high-speed switching devices MOSFET, switching frequency can be increased to 25KHz ~ 45KHz.The ac square-wave voltage of the high frequency after conversion boosts as amplitude is the ac square-wave voltage of 15KV through LCC series parallel resonance circuit 5 and main power transformer T1.LCC series parallel resonance circuit 5 is made up of resonant inductance L1, series resonant capacitance group C9 and parallel resonance capacitance group C10, wherein, one end of resonant inductance L1 is electrically connected with the common connection end of power switch pipe V1 and power switch pipe V3, and its other end is connected with one end of described series resonant capacitance group C9; The other end of series resonant capacitance group C9 is connected with one end of parallel resonance capacitance group C10, the other end of parallel resonance capacitance group C10 is electrically connected with the common connection end of power switch pipe V2 and power switch pipe V4, and the two ends of parallel resonance capacitance group C10 are connected with the two ends of the primary circuit of main power transformer T1.Series resonant capacitance group C9 can be made up of many Capacitance parallel connections, parallel resonance capacitance group C10 also can be made up of many Capacitance parallel connections, wherein, the quantity of the electric capacity that series resonant capacitance group C9 and parallel resonance capacitance group C10 comprises is determined by specific parameter, in the present embodiment, series resonant capacitance group C9 forms 3uF, parallel resonance capacitance group C10 altogether by the Capacitance parallel connection of three 1000V1uF and forms 1.32uF altogether by the Capacitance parallel connection of two 1000V/0.66uF.The ac square-wave voltage of the high frequency transformed through full bridge inverter 4 boosts as amplitude is the ac square-wave voltage of 15KV by LCC series parallel resonance circuit 5 and main power transformer T1 jointly, and main power transformer T1 adopts ultracrystallite high-performance magnetic core to form through special process coiling.The rectification of 15KV ac square-wave voltage is high-pressure pulsating direct voltage by high-voltage rectification assembly 6.Wherein, high-voltage rectification assembly 6 forms primarily of high-voltage rectification silicon stack diode D7, diode D8, diode D9 and diode D10, and diode D7-D10 is formed in parallel by 8 20KV/1A high-voltage rectification silicon stacks respectively.Diode D7 connects with diode D9 formation branch road, and diode D8 connects with diode D10 and forms another branch road, and two branch roads carry out parallel connection again; The two ends of the primary circuit of main power transformer T1 are connected with the two ends of parallel resonance electric capacity C10, one end of its secondary circuit is electrically connected with the common connection end of diode D7 and diode D9, and the other end is electrically connected with the common connection end of diode D8 and diode D10.The smooth dc voltage that high-pressure pulsating direct voltage is filtered into-15KV through high-voltage energy storage filter capacitor C11 exports, and high-voltage energy storage filter capacitor C11 has the function of high-voltage energy storage.Resistor assembly 7 is made up of resistance R2 and resistance R3, and resistance R2 connects with resistance R3, and resistor assembly 7 has the function of voltage sample.
The power supply that the present embodiment provides also comprises the slow start circuit 2 composed in parallel by resistance R1 and contactor K1, and it is connected in series between full bridge rectifier 1 and filter capacitor component 3, is used for filter capacitor component 3 precharge.
In the present embodiment, power supply also comprises Control protection plate 8, driver module 9, low tension source plate 10 summation current transformer 11, and wherein, one end of Control protection plate 8 is connected between resistance R2 and resistance R3, and this end is also electrically connected with current transformer 11; The branch road that current transformer 11 is connected to resistor assembly 7 place is sampled to the electric current of this branch road; The other end of Control protection plate 8 is electrically connected with described driver module 9, and driver module 9 is electrically connected with the grid of the grid of power switch pipe V1, the grid of power switch pipe V2, the grid of power switch pipe V3 and power switch pipe V4 respectively; Low tension source plate 10 is electrically connected with Control protection plate 8 and driver module 9 respectively.Control protection plate 8 is for the output current sampled signal of the voltage sampling signal and current transformer 11 that receive resistor assembly 7, and export four tunnel square wave voltage signal of 25KHz ~ 45KHz frequency, amplify rear drive power switch pipe V1, V2, V3 and V4 through driver module 9, improve the switching frequency of power switch pipe V1-V4; Low tension source plate 10 is made up of four linear power supplys, powers for giving the low-pressure section such as control circuit board 8 and driver module 9.
Embodiment two, a kind of method improving switching frequency.Below in conjunction with Fig. 2, the method that the present embodiment provides is described.
The present embodiment adopts a kind of LCC series parallel resonance power supply in embodiment one to improve the switch power of power switch pipe in full bridge inverter 4.Can with reference to Fig. 2 and embodiment one, first, three-phase alternating current electric rectification is be filtered into level and smooth direct voltage through filter capacitor component 3 after pulsating dc voltage by full bridge rectifier 1; Then filtered smooth dc voltage is after the ac square-wave voltage that full bridge inverter 4 is converted into high frequency, and it carries out boosting process through LCC series parallel resonance circuit 5 and main power transformer T1 again, obtains high-voltage alternating square wave; The rectification of high-voltage alternating square wave is high-pressure pulsating direct voltage by high-voltage rectification assembly 6 subsequently; High-pressure pulsating direct current is filtered into smooth dc voltage output through high-voltage energy storage filter capacitor C11 subsequently, and the smooth dc voltage of resistor assembly 7 to this output is sampled.
Slow start circuit in LCC series parallel resonance power supply 2 pairs of filter capacitor component 3 carry out precharge, and wherein slow start circuit 2 is composed in parallel by resistance R1 and contactor K1, and it is connected in series between full bridge rectifier 1 and filter capacitor component 3.
The branch road at 11 pairs of resistor assembly 7 places of the current transformer in LCC series parallel resonance power supply carries out current sample; Control protection plate 8 receives the current sampling signal of the voltage sampling signal summation current transformer 11 of resistor assembly 7, and exports four tunnel square wave voltage signal; The four tunnel square wave voltage signal that driver module 9 pairs of Control protection plates 8 export are amplified with driving power switching tube V1, V2, V3 and V4.
A kind of LCC series parallel resonance power supply provided by the invention and a kind of method improving power switch pipe switch power, the power switch pipe of this power supply adopts high-speed switching devices MOSFET, switching frequency can be increased to 25KHz ~ 45KHz, reduce power volume and output filter capacitor capacity, also reduce output ripple, improve the reliability of power supply; In addition, power acquisition soft switch technique, by the LCC series parallel resonance circuit be made up of resonant inductance L1, series resonant capacitance group C9 and parallel resonance capacitance group C10, make power switch pipe turn-on and turn-off under zero voltage condition, improve the switching frequency of power switch pipe, reduce switching loss, reduce switch noise, improve power-efficient.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a LCC series parallel resonance power supply, it is characterized in that, described power supply comprises full bridge rectifier (1), filter capacitor component (3), full bridge inverter (4), LCC series parallel resonance circuit (5) and main power transformer T I, high-voltage rectification assembly (6), high-voltage energy storage filter capacitor C11 and resistor assembly (7);
Described full bridge rectifier (1), described filter capacitor component (3) and described full bridge inverter (4) are in parallel successively, the output of described full bridge inverter (4) is connected with the input of described resonant capacitance assembly (5), the output of described resonant capacitance assembly (5) is connected with the primary circuit of main power transformer T1, the secondary circuit of described main power transformer T1 is connected with the input of described high-voltage rectification assembly (6), the output of described high-voltage rectification assembly (6) is connected with the input of high-voltage energy storage filter capacitor C11, the output of described high-voltage energy storage filter capacitor C11 is connected with the input of described resistor assembly (7), and described high-voltage rectification assembly (6), one end ground connection of high-voltage energy storage filter capacitor C11 and resistor assembly (7),
Described full bridge rectifier (1) is three-phase bridge rectification circuit, is pulsating dc voltage by three-phase alternating current electric rectification;
Pulsating dc voltage after described full bridge rectifier (1) rectification is filtered into level and smooth direct voltage by described filter capacitor component (3);
Level and smooth direct voltage after described filter capacitor component (3) filtering is converted into high-frequency ac square-wave voltage by described full bridge inverter (4);
Described LCC series parallel resonance circuit (5) and main power transformer T1 carry out boosting process to described high-frequency ac square-wave voltage;
Ac square-wave voltage rectification after described boosting is high-pressure pulsating direct voltage by described high-voltage rectification assembly (6);
High-pressure pulsating direct voltage is filtered into smooth dc voltage through high-voltage energy storage filter capacitor C11 and exports;
Described resistor assembly (7) is sampled for the direct voltage exported described high-voltage energy storage filter capacitor C11.
2. a kind of LCC series parallel resonance power supply as claimed in claim 1, it is characterized in that, also comprise the slow start circuit (2) composed in parallel by resistance R1 and contactor K1, it is connected in series between full bridge rectifier (1) and filter capacitor component (3), is used for filter capacitor component (3) precharge.
3. a kind of LCC series parallel resonance power supply as claimed in claim 1, it is characterized in that, described full bridge inverter (4) is made up of power switch pipe V1, V2, V3 and V4, wherein, V1 and V3 series connection formation branch road, V2 and V4 series connection forms another branch road, and two branch roads carry out parallel connection again, and described power switch pipe V1, V2, V3 and V4 are high-speed switching devices MOSFET.
4. a kind of LCC series parallel resonance power supply as claimed in claim 3, is characterized in that, described LCC series parallel resonance circuit (5) is made up of resonant inductance L1, series resonant capacitance group C9 and parallel resonance capacitance group C10;
Wherein, one end of described resonant inductance L1 is electrically connected with the common connection end of described power switch pipe V1 and power switch pipe V3, and its other end is connected with one end of described series resonant capacitance group C9; The other end of described series resonant capacitance group C9 is connected with one end of described parallel resonance capacitance group C10, and the other end of described parallel resonance capacitance group C10 is electrically connected with the common connection end of power switch pipe V2 and power switch pipe V4; And the two ends of described parallel resonance capacitance group C10 are connected with the two ends of the primary circuit of main power transformer T1.
5. a kind of LCC series parallel resonance power supply as claimed in claim 4, is characterized in that, described series resonant capacitance group C9 and described parallel resonance capacitance group C10 is formed by several Capacitance parallel connections, and wherein, the quantity of electric capacity is determined by specific calculating parameter.
6. a kind of LCC series parallel resonance power supply as claimed in claim 4, it is characterized in that, described high-voltage rectification assembly (6) is made up of diode D7, diode D8, diode D9 and diode D10, wherein, described diode D7 connects with diode D9 formation branch road, described diode D8 connects with diode D10 and forms another branch road, and two branch roads carry out parallel connection again;
The two ends of the primary circuit of described main power transformer T1 are connected with the two ends of parallel resonance electric capacity C10, one end of its secondary circuit is electrically connected with the common connection end of described diode D7 and diode D9, and the other end is electrically connected with the common connection end of described diode D8 and diode D10.
7. a kind of LCC series parallel resonance power supply as claimed in claim 6, it is characterized in that, described resistor assembly (7) comprises resistance R2 and resistance R3, and described resistance R2 connects with resistance R3 formation branch road.
8. a kind of LCC series parallel resonance power supply as claimed in claim 7, it is characterized in that, also comprise Control protection plate (8), driver module (9), low tension source plate (10) summation current transformer (11), one end of described Control protection plate (8) is connected between described resistance R2 and described resistance R3, and this end is also electrically connected with described current transformer (11), described current transformer (11) is connected on the branch road at resistor assembly (7) place, the other end of described Control protection plate (8) is electrically connected with described driver module (9), described driver module (9) respectively with the grid of described power switch pipe V1, the grid of power switch pipe V2, the grid of power switch pipe V3 and the grid electrical connection of power switch pipe V4, described low tension source plate (10) is electrically connected with described Control protection plate (8) and driver module (9) respectively,
Described Control protection plate (8) is for receiving voltage sampling signal and described current transformer (11) the output current sampled signal over the ground of resistor assembly (7), and export four tunnel square wave voltage signal, amplify rear drive power switch pipe V1, V2, V3 and V4 through driver module (9);
Described low tension source plate (10) is made up of four linear power supplys, for giving control circuit board (8) and driver module (9) power supply.
9. improve a method for switching frequency, it is characterized in that, it adopts a kind of LCC series parallel resonance power supply described in claim 1-8, comprising:
Three-phase alternating current electric rectification is be filtered into level and smooth direct voltage through filter capacitor component (3) after pulsating dc voltage by step S201, full bridge rectifier (1);
Step S202, described filtered smooth dc voltage are after full bridge inverter (4) is converted into the ac square-wave voltage of high frequency, it carries out boosting process through LCC series parallel resonance circuit (5) and main power transformer T1 again, obtains high-voltage alternating square wave;
The rectification of described high-voltage alternating square wave is high-pressure pulsating direct voltage by step S203, high-voltage rectification assembly (6);
Step S204, described high-pressure pulsating direct current are filtered into smooth dc voltage through high-voltage energy storage filter capacitor C11 and export, and resistor assembly (7) smooth dc voltage to this output is sampled.
10. a kind of method improving switching frequency as claimed in claim 9, is characterized in that, also comprise:
The branch road of current transformer (11) to resistor assembly (7) place carries out current sample;
Control protection plate (8) receives the current sampling signal of the voltage sampling signal summation current transformer (11) of resistor assembly (7), and exports four tunnel square wave voltage signal;
Driver module (9) amplifies the four tunnel square wave voltage signal that Control protection plate (8) exports with driving power switching tube V1, V2, V3 and V4.
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