CN203522524U - X-ray machine power factor correction circuit based on zero-voltage transition soft switching - Google Patents
X-ray machine power factor correction circuit based on zero-voltage transition soft switching Download PDFInfo
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- CN203522524U CN203522524U CN201320666907.2U CN201320666907U CN203522524U CN 203522524 U CN203522524 U CN 203522524U CN 201320666907 U CN201320666907 U CN 201320666907U CN 203522524 U CN203522524 U CN 203522524U
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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
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Abstract
The utility model discloses an X-ray machine power factor correction circuit based on zero-voltage transition soft switching. The X-ray machine power factor correction circuit comprises a bridge type rectifying circuit, an inductor L, a main switching power tube VT, a power diode VD and an output capacitor C0, wherein an output positive electrode end of the bridge type rectifying circuit, the inductor L, the power diode VD, the output capacitor C0 and an output negative electrode end of the bridge type rectifying circuit are sequentially connected in series to form a loop; an input end and an output end of the main switching power tube VT are respectively connected with an output end of the inductor L and the output negative electrode end of the bridge type rectifying circuit, and a control end of the main switching power tube VT is connected with a switch control circuit. The X-ray machine power factor correction circuit further comprises an auxiliary switching circuit, which is mainly composed of an auxiliary switching power tube VT1, a fast recovery diode VD1, a fast recovery diode VD2 and a resonant inductor Lr. The X-ray machine power factor correction circuit is simple in structure and reasonable in design, is safe and reliable, realizes the zero voltage switching of the power switch, reduces the switching loss and switching stress, and improves the ability of circuit electromagnetic compatibility.
Description
Technical field
The utility model relates to a kind of circuit of power factor correction, has related in particular to a kind of circuit of power factor correction being applied on X-ray production apparatus and based on the excessive soft switch designs of no-voltage.
Background technology
In general, the high frequency mobile x rays machine of frequency more than 40KHZ, generally only need 3.5-5KW just can meet conventional film making requirement completely, because of X ray efficiency high, equal film making requires lower power less, only needs 220V single-phase alternating current can normally use (select with the instrument of built-in TunePower and still can normally work) in the situation that having a power failure or going out; Meanwhile, mobile X-ray unit, safety and Protection is better, reaches the security protection requirement of national mobile X-ray unit, does not need the protection of plumbous room during use, and easy to use, cost is low, and any hospital comprises health clinics in towns and townships, under existing condition, can directly use.
Yet, in health clinics in towns and townships, particularly backwoodsman health clinics in towns and townships and vast Village clinic, power supply quality is very undesirable, the line voltage amplitude of China's regulation generally allows there is up and down 10% fluctuation, Dan outlying mountain area and vast rural area, line voltage even can be low to about 120 volts, makes traditional basic cisco unity malfunction of high frequency medical X ray machine.In addition, European Union and the U.S. started the related standards of the IEC6300 of compulsory implement International Electrotechnical Commission (IEC) in 2011, the indexs such as power factor to all electronic equipments have new requirement, and traditional high frequency mobile x rays machine can not meet the related standards of IEC6300.Therefore, in existing X-ray production apparatus, embedding key and the trend that circuit of power factor correction has become the sector development in the market.But, not yet there is the circuit of power factor correction designing for above-mentioned situation at present, existing circuit of power factor correction can't meet above-mentioned requirement simultaneously, and, generally cannot realize no-voltage and open power switch; Therefore, on market, be badly in need of a kind of circuit of power factor correction designing and be specifically applied to X-ray production apparatus for above-mentioned situation.
Summary of the invention
The purpose of this utility model is to provide a kind of circuit structure simply, both can so that high frequency medical X-ray function adapts to the requirement that rural area quality of voltage grade is low, (adopt after circuit of power factor correction, its input voltage range can normally be worked between 85 volts to 270 volts), also make high frequency medical X-ray function meet the technical requirement of European & American Market, safe and reliable; And can improve circuit of power factor correction performance, and make power switch realize no-voltage open-minded, reduce switching loss, reduce switch stress, improve the X-ray production apparatus circuit of power factor correction of the Electro Magnetic Compatibility ability of circuit of power factor correction itself.
To achieve these goals, the utility model has adopted following technical scheme:
An X-ray production apparatus circuit of power factor correction based on the excessive soft switch of no-voltage, comprises bridge rectifier, inductance L, main switch power tube VT, power diode VD and output capacitance C
0; The output cathode end of described bridge rectifier, inductance L, power diode VD, output capacitance C
0connect successively and form a loop with the output negative pole end of bridge rectifier; The output of described bridge rectifier is also parallel with high-frequency filter capacitor C
1; Input, the output of described main switch power tube VT are connected with the output of inductance L, the output negative pole end of bridge rectifier respectively, and the control end of main switch power tube VT is connected with ON-OFF control circuit; Wherein, this X-ray production apparatus circuit of power factor correction also comprises auxiliary switching circuit; Described auxiliary switching circuit is mainly by auxiliary switch power tube VT
1, two fast recovery diode VD
1, VD
2, resonant inductance Lr forms; Described resonant inductance Lr, fast recovery diode VD
2, auxiliary switch power tube VT
1circuit two ends after series connection are in parallel with main switch power tube VT successively; Described fast recovery diode VD
1input and fast recovery diode VD
2output be connected, output and output capacitance C
0one end be connected; The two ends of described main switch power tube VT are also parallel with diode VDs and resonance capacitor C r.
In the utility model, auxiliary switch power tube VT
1control line end and the PWM comparator U in ON-OFF control circuit
3end of oppisite phase be connected.
As of the present utility model, further illustrate, above-described bridge rectifier is by four rectifier diode D
1, D
2, D
3, D
4form, and the input of bridge rectifier is connected with alternating current AC; Described output capacitance C
0two ends shunt load R.
In the technical solution of the utility model, described ON-OFF control circuit is mainly by voltage error amplifier U
1, current error amplifier U
2, PWM comparator U
3, rest-set flip-flop U
4, multiplier and oscillator form; Wherein,
Described voltage error amplifier U
1negative input be connected on the outlet line of correcting circuit, sampling and outputting voltage signal; Voltage error amplifier U
1electrode input end is the input of given voltage reference signal Vref, voltage error amplifier U
1output be connected with an input of multiplier, the voltage error signal after amplifying to multiplier input;
Another input of described multiplier is connected with the cathode output end of bridge rectifier, to half-sinusoid signal after the rectification of multiplier input line voltage; The output of multiplier and current error amplifier U
2electrode input end be connected, to current error amplifier U
2input given current signal;
Described current error amplifier U
2negative input be connected with the coil being arranged on bridge rectifier cathode output end circuit, current error amplifier U
2output and PWM comparator U
3negative input be connected, to PWM comparator U
3input current error signal;
Described PWM comparator U
3electrode input end be connected with oscillator, input sawtooth waveforms, through and current error signal comparison, produce pwm control signal; PWM comparator U
3output and rest-set flip-flop U
4r line end be connected, rest-set flip-flop U
4s line end be connected with oscillator, rest-set flip-flop U
4q line end be connected with the control end of main switch power tube VT, control the on off operating mode of main switch power tube VT.
Circuit working principle of the present utility model, we describe by its principle waveform:
1. t
0～t
1period: t
0moment switching tube VT
1conducting, diode VD is still in conducting state, now inductance L
rboth end voltage is U
o, inductance L
rtwo ends current i
lrlinear rising, meanwhile, the electric current of diode VD declines with identical speed.T
1constantly, inductance L
rtwo ends current i
lrwith inductance L two ends electric current I
lequate, now the electric current of diode VD is zero, and diode turn-offs;
2. t
1～t
2period: inductance L
rwith capacitor C
rform resonant tank, capacitor C
ron energy transfer to inductance L
rupper, t
2moment capacitance voltage u
crbe zero, diode VD now
sconducting, capacitance voltage u
crbe clamped on zero, and current i
lrto remain unchanged.
3. t
2～t
3period: capacitance voltage u
crcontinue to be clamped on zero, current i
lrstill remain unchanged, this operating state remains to t always
3moment VT opens, VT
1turn-off;
4. t
3～t
4period: t
3vT no-voltage is open-minded constantly.VT when VT opens
1turn-off L
rin energy pass through VD
2, VD
1to load-side, carry, its electric current is linear to decline, and main switch VT electric current is linear to rise.T
4moment i
lr=0, VD
1turn-off main switch VT current i
s=I
l, circuit enters normally state.
5. t
4～t
5period: t
5vT turn-offs constantly.C
rlimit the climbing of main switch VT voltage, reduced the turn-off power loss of VT.
The beneficial effects of the utility model:
1. circuit structure is simple, reasonable in design, safe and reliable; This APFC is embedded to high frequency medical X ray machine, both can so that adapting to the requirement that rural area quality of voltage grade is low, high frequency medical X-ray function (adopt after circuit of power factor correction, its input voltage range can normally be worked between 85 volts to 270 volts), also make high frequency medical X-ray function meet the technical requirement of European & American Market; And the improving cost to X-ray production apparatus is low, without other too much expense, can save many funds for medical administration and organisation, greatly reduced the medical treatment cost of medical institutions, meet the outlying district people's medical requirement, promote the development of China's medical industry, also can bring good social benefit and significant economic benefit.
2. can improve circuit of power factor correction performance, make power switch realize no-voltage open-minded, reduce switching loss, reduce switch stress, improve the Electro Magnetic Compatibility ability of circuit of power factor correction itself.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Fig. 2 is principle oscillogram of the present utility model.
In Fig. 1:
AC represents AC power;
D
1, D
2, D
3, D
4four rectifier diodes form rectifier bridge (bridge rectifier), play rectified action;
C
1for high-frequency filter capacitor, its capacitance is generally less, is generally 0.1-1uF rank;
L is inductance, plays storage and transferring energy;
VT is main switch power tube, and VDs is its parasitic diode in parallel, and Cr is its resonant capacitance in parallel.
VD is power diode;
C
0for output capacitance, when main switch turn-offs, load institute energy requirement is provided by it, plays pressure stabilization function, and its capacitance is generally larger, and mainly the size by power output determines;
R is load;
Lr is resonant inductance, forms resonant network open condition for main switch power tube provides no-voltage with resonant capacitance Cr;
VD
1, VD
2for fast recovery diode, play one-way conduction effect, the electric energy transfer on Lr is arrived to load;
VT
1for auxiliary switch, its effect is to open condition for main switch provides no-voltage.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further illustrated.
Embodiment 1:
As shown in the figure, a kind of X-ray production apparatus circuit of power factor correction based on the excessive soft switch of no-voltage, comprises bridge rectifier, inductance L, main switch power tube VT, power diode VD and output capacitance C
0; The output cathode end of described bridge rectifier, inductance L, power diode VD, output capacitance C
0connect successively and form a loop with the output negative pole end of bridge rectifier; The output of described bridge rectifier is also parallel with high-frequency filter capacitor C
1; Input, the output of described main switch power tube VT are connected with the output of inductance L, the output negative pole end of bridge rectifier respectively, and the control end of main switch power tube VT is connected with ON-OFF control circuit; Wherein, this X-ray production apparatus circuit of power factor correction also comprises auxiliary switching circuit; Described auxiliary switching circuit is mainly by auxiliary switch power tube VT
1, two fast recovery diode VD
1, VD
2, resonant inductance Lr forms; Described resonant inductance Lr, fast recovery diode VD
2, auxiliary switch power tube VT
1circuit two ends after series connection are in parallel with main switch power tube VT successively; Described fast recovery diode VD
1input and fast recovery diode VD
2output be connected, output and output capacitance C
0one end be connected; The two ends of described main switch power tube VT are also parallel with diode VDs and resonance capacitor C r.
Above-described bridge rectifier is by four rectifier diode D
1, D
2, D
3, D
4form, and the input of bridge rectifier is connected with alternating current AC; Described output capacitance C
0two ends shunt load R.
Claims (2)
1. the X-ray production apparatus circuit of power factor correction based on the excessive soft switch of no-voltage, comprises bridge rectifier, inductance L, main switch power tube VT, power diode VD and output capacitance C
0; The output cathode end of described bridge rectifier, inductance L, power diode VD, output capacitance C
0connect successively and form a loop with the output negative pole end of bridge rectifier; The output of described bridge rectifier is also parallel with high-frequency filter capacitor C
1; Input, the output of described main switch power tube VT are connected with the output of inductance L, the output negative pole end of bridge rectifier respectively, and the control end of main switch power tube VT is connected with ON-OFF control circuit; It is characterized in that: this X-ray production apparatus circuit of power factor correction also comprises auxiliary switching circuit; Described auxiliary switching circuit is mainly by auxiliary switch power tube VT
1, two fast recovery diode VD
1, VD
2, resonant inductance Lr forms; Described resonant inductance Lr, fast recovery diode VD
2, auxiliary switch power tube VT
1circuit two ends after series connection are in parallel with main switch power tube VT successively; Described fast recovery diode VD
1input and fast recovery diode VD
2output be connected, output and output capacitance C
0one end be connected; The two ends of described main switch power tube VT are also parallel with diode VDs and resonance capacitor C r.
2. the X-ray production apparatus circuit of power factor correction based on the excessive soft switch of no-voltage according to claim 1, is characterized in that: described bridge rectifier is by four rectifier diode D
1, D
2, D
3, D
4form, and the input of bridge rectifier is connected with alternating current AC; Described output capacitance C
0two ends shunt load R.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320666907.2U CN203522524U (en) | 2013-10-28 | 2013-10-28 | X-ray machine power factor correction circuit based on zero-voltage transition soft switching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320666907.2U CN203522524U (en) | 2013-10-28 | 2013-10-28 | X-ray machine power factor correction circuit based on zero-voltage transition soft switching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203522524U true CN203522524U (en) | 2014-04-02 |
Family
ID=50381397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320666907.2U Expired - Fee Related CN203522524U (en) | 2013-10-28 | 2013-10-28 | X-ray machine power factor correction circuit based on zero-voltage transition soft switching |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203522524U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106537751A (en) * | 2014-09-10 | 2017-03-22 | 欧姆龙株式会社 | Electronic circuit and electronic circuit control method |
| CN107070195A (en) * | 2017-03-22 | 2017-08-18 | 哈尔滨工业大学深圳研究生院 | The totem circuit of power factor correction of half power frequency period resonant type soft-switch structure |
-
2013
- 2013-10-28 CN CN201320666907.2U patent/CN203522524U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106537751A (en) * | 2014-09-10 | 2017-03-22 | 欧姆龙株式会社 | Electronic circuit and electronic circuit control method |
| CN107070195A (en) * | 2017-03-22 | 2017-08-18 | 哈尔滨工业大学深圳研究生院 | The totem circuit of power factor correction of half power frequency period resonant type soft-switch structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 530031 the Guangxi Zhuang Autonomous Region mayor of Nanning Road No. 16 Patentee after: Nanning medical electronic equipment Limited by Share Ltd Address before: 530031 the Guangxi Zhuang Autonomous Region mayor of Nanning Road No. 16 Patentee before: Nanning Yiju Medical Electronic Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140402 Termination date: 20201028 |