CN103841739A - Full bridge and half bridge switching circuit for medical high-frequency high-voltage generator - Google Patents
Full bridge and half bridge switching circuit for medical high-frequency high-voltage generator Download PDFInfo
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- CN103841739A CN103841739A CN201410093009.1A CN201410093009A CN103841739A CN 103841739 A CN103841739 A CN 103841739A CN 201410093009 A CN201410093009 A CN 201410093009A CN 103841739 A CN103841739 A CN 103841739A
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Abstract
The invention relates to a full bridge and half bridge switching circuit for a medical high-frequency high-voltage generator. The circuit comprises a switching module (1), a driving module (2), a transformation module (3) and a high-voltage rectifier module (4), the input end of the driving module (2) is connected with the switching module (1), the output end of the driving module (2) is connected with the transformation module (3), the input end of the high-voltage rectifier module (4) is connected with the transformation module (3), and the output end of the high-voltage rectifier module (4) is connected with an X-ray tube. The switching module (1) controls the driving module (2) to carry out full bridge and half bridge transformation, the driving module (2) controls the work state of the transformation module (3), the transformation module (3) carries out inversion on direct currents input by a transformer into high-frequency square waves, the square waves are sent to the input end of the high-voltage rectifier module (4), and the square waves are changed into high-voltage direct currents after boosting, high voltage silicon rectifier stack rectifying and high voltage capacitor filtering processing. Compared with the prior art, the circuit has the advantages of being wide in power adjustment range, precise in control and the like.
Description
Technical field
The present invention relates to a kind of full semi-bridge switching circuit, especially relate to a kind of full semi-bridge switching circuit for medical high-frequency high voltage generator.
Background technology
High-frequency and high-voltage generator is one of most important core component in Medical X-ray diagnostic equipment system.The power supply of converter high pressure generator, by the input of three-phase (or single-phase) electric main, through rectifying and wave-filtering, becomes pulsating direct current, adds to converter.This DC inversion is become high frequency square wave by converter, at the step-down side that adds to high pressure generator medium-high frequency high-tension transformer.The output of high frequency high voltage transformer, through high voltage silicon stack rectification, high-voltage capacitance filtering, becomes high voltage direct current, supplies with x-ray and penetrates pipe.
As shown in Figure 1, series resonant converter can be adjusted power output by changing operating frequency f, and when f is during much larger than fs (series resonance frequency), power output reduces, and in the time that f approaches fs (series resonance frequency), power output increases.Existing medical high-frequency high voltage generator adopts control operating frequency f to adjust power output, but because the current margin of X-ray tube is very wide, can be from the several milliamperes of hundreds of milliamperes to film making of perspective, so separately adjusting power output by change operating frequency f is Enough not, particularly at full-bridge converter in perspective when operating state, because operating frequency is high and longevity of service, the problem of temperature rise that solve converter and resonant inductance can become very difficult.
Summary of the invention
Object of the present invention is exactly to provide a kind of full semi-bridge switching circuit for high-power adjusting range medical high-frequency high voltage generator in order to overcome the defect that above-mentioned prior art exists.
Object of the present invention can be achieved through the following technical solutions:
A kind of full semi-bridge switching circuit for medical high-frequency high voltage generator, this circuit is penetrated pipe with X ray and is connected, it is characterized in that, this circuit comprises handover module, driver module, conversion module and high-voltage rectifying module, described driver module input is connected with handover module, output is connected with conversion module, and described high-voltage rectifying module input is connected with conversion module, and output is connected with X-ray tube;
Described handover module control driver module carries out full semi-bridge alternation, described driver module control change module operating state, described conversion module becomes high frequency square wave by the DC inversion of converter input and sends into the input of high-voltage rectifying module, through boosting, high voltage silicon stack rectification and high-voltage capacitance filtering becomes high voltage direct current after processing, supply with X ray and penetrate pipe.
Described handover module comprises triode V1, resistance R 11, resistance R 12, relay J 1 and diode D1, described resistance R 12 one end are connected with switch-over control signal, the other end is connected with the base stage of resistance R 11 one end and triode V1 respectively, the emitter of described triode V1, the equal ground connection of resistance R 11 other end, the anode of described diode D1 is connected with the collector electrode of triode V1, negative electrode is connected with supply power voltage VCC, and relay J 1 is connected in parallel on diode D1 two ends;
Described switch-over control signal is by triode V1 control relay J1 power on/off, and then control driver module carries out full half-bridge switching, relay J 1 afterflow when described diode D1 turn-offs for triode V1.
Described conversion module comprises four power field effect pipe S1, S2, S3, S4, described driver module comprises voltage controlled oscillator VCO, four resistance R 1, R2, R3, R4 and four optocoupler driver element N1, N2, N3, N4, described voltage controlled oscillator VCO output A is connected with one end of resistance R 3, output B is connected with one end of resistance R 1, described resistance R 2 one end, resistance R 4 is connected with relay J 1 respectively, described four resistance R 1, R2, R3, the R4 other end respectively with four optocoupler driver element N1, N2, N3, N4 input connects, described four optocoupler driver element N1, N2, N3, N4 output respectively with four power field effect pipe S1, S2, S3, S4 input connects,
When described conversion module works in full-bridge state, resistance R 4 is connected with voltage controlled oscillator VCO output B, and resistance R 2 is connected with described voltage controlled oscillator VCO output A; When described conversion module works in semi-bridge type converter, resistance R 4 and supply power voltage VCC one end, resistance R 2 is connected with the earth point of handover module.
Described voltage controlled oscillator VCO output A is anti-phase with output B.
The output of described conversion module is connected to inductance and electric capacity.
Described high-voltage rectifying module comprises a high-tension transformer and a high-voltage rectifier, conversion module is connected with the low-pressure side of high-tension transformer, the high-pressure side of high-tension transformer is connected with high-voltage rectifier, and this module output is connected with X-ray tube+utmost point and X-ray tube-utmost point respectively.
In the time of needs small-power, described switch-over control signal is input as high level, triode conducting, and relay adhesive, circuit working state is equivalent to a semi-bridge type converter,
In the time that needs are high-power, described switch-over control signal is input as low level, triode cut-off, and relay discharges, and circuit working is at full-bridge converter state.
Described converter produces high frequency square wave electric current and is sent into the input of high-voltage rectifying module, through high-tension transformer boost, high-voltage rectifier carries out high voltage silicon stack rectification and high-voltage capacitance filtering becomes high voltage direct current after processing, and supplies with X-ray tube.
Compared with prior art, the present invention has the following advantages.
1) use the present invention can carry out easily full half-bridge switching, thereby obtain larger power regulating range.
2) the present invention can work long hours, and when its work, reliability is high.
3) control precisely, error is little.
4) circuit design is intensive, reduces materials'use, reduces costs.
Brief description of the drawings
Fig. 1 is series resonant converter voltage conversion ratio curve;
Fig. 2 is high-level schematic functional block diagram of the present invention;
Fig. 3 is circuit diagram of the present invention;
Circuit diagram when Fig. 4 is semi-bridge alternation of the present invention;
Fig. 5 is the equivalent function figure of Fig. 4;
Circuit diagram when Fig. 6 is full-bridge conversion of the present invention;
Wherein: 1, handover module; 2, driver module; 3, conversion module; 4, high-voltage rectifying module; J1, relay; V1, triode; D1, diode; VCO, voltage controlled oscillator; A, B, driver module output; R1, R2, R3, R4, R11, R12, resistance; N1, N2, N3, N4, optocoupler driver element; S1, S2, S3, S4, power field effect pipe; L1, inductance; C1, electric capacity; T1, high-tension transformer; U1, high-voltage rectifier.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.The present embodiment is implemented as prerequisite taking technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 2, a kind of full semi-bridge switching circuit for medical high-frequency high voltage generator, this circuit comprises handover module 1, driver module 2, conversion module 3 and high-voltage rectifying module 4, driver module 2 inputs are connected with handover module 1, output is connected with conversion module 3, high-voltage rectifying module 4 inputs are connected with conversion module 3, and output is connected with X-ray tube
As shown in Figure 3, handover module 1 comprises triode V1, resistance R 11, R12, relay J 1 and diode D1, resistance R 12 one end are connected with switch-over control signal, one end is connected with the base stage of resistance R 11 and triode V1 respectively, the emitter of triode J1 is connected and ground connection with the R11 other end, and the anode of diode D1 is connected with the collector electrode of triode J1, and negative electrode is connected with supply power voltage VCC, relay J 1 is in parallel with diode D1
Switch-over control signal is by triode V1 control relay J1 power on/off, and then control driver module 2 carries out full half-bridge switching, relay J 1 afterflow when diode D1 turn-offs for triode J1.
As shown in Figure 3, conversion module 3 comprises power field effect pipe S1, S2, S3, S4, driver module 2 comprises voltage controlled oscillator VCO, resistance R 1, R2, R3, R4 and optocoupler driver element N1, N2, N3, N4, voltage controlled oscillator VCO output A respectively with resistance R 2, one end of R3 connects, output B respectively with resistance R 1, one end of R4 connects, resistance R 1, R2, R3, the R4 other end respectively with optocoupler driver element N1, N2, N3, N4 input connects, optocoupler driver element N1, N2, N3, N4 output respectively with the power field effect pipe S1 of conversion module 3, S2, S3, S4 input connects.
As shown in Figure 3, conversion module 3 is a common full bridge circuit, its output adds inductance L 1 and capacitor C 1, high-voltage rectifying module 4 comprises high-tension transformer T1 and high-voltage rectifier U1, conversion module 3 is connected with the low-pressure side of high-tension transformer T1, the high-pressure side of high-tension transformer T1 is connected with high-voltage rectifier U1, the output of high-voltage rectifier U1 respectively with X-ray tube+utmost point and-utmost point is connected.
In the time of needs small-power, switch-over control signal is input as high level, triode V1 conducting, electric current flows through J1 from VCC successively, V1 is to earth electrode, relay J 1 adhesive, circuit working state as shown in Figure 4, resistance R 4 is connected with VCC, optocoupler driver module N4 lasting reception high level power ratio control field effect transistor S4 are normally closed, controlling resistance R2 ground connection, optocoupler driver module N2 continues to receive low level and power ratio control field effect transistor S2 often opens, its equivalent electric circuit as shown in Figure 5, translation circuit is a half-bridge circuit, when voltage controlled oscillator VCO output, A is high level, when output B is low level, S1 cut-off, S3 conducting, electric current is from inverter power supply+utmost point S1 that flows through, L1, C1 is to inverter power supply-utmost point, when output, A is low level, when output B is high level, and S1 conducting, S3 cut-off, inverter power supply is disconnected, remaining freewheel current, freewheel current flows to as S3-L1-C1-S3.
In the time that needs are high-power, switch-over control signal is input as low level, triode V1 cut-off, and in relay J 1, residual current discharges by sustained diode 1, and relay J 1 discharges, and circuit working state is as shown in Figure 6.When voltage controlled oscillator VCO output, A is high level, when output B is low level, S1 and S4 cut-off, S2 and S3 conducting, electric current is flowed through S2, C1, L1, S3 to inverter power supply-utmost point from inverter power supply+utmost point, when voltage controlled oscillator VCO output, A is low level, when output B is high level, S1 and S4 conducting, S2 and S3 cut-off, electric current is flowed through S1, L1, C1, S4 to inverter power supply-utmost point from inverter power supply+utmost point, produces high frequency square wave electric current.
Converter high frequency square wave is sent into the input of high-voltage rectifying module 4, through high-tension transformer T1 boost, high-voltage rectifier U1 carries out high voltage silicon stack rectification and high-voltage capacitance filtering process after become high voltage direct current, supply with X-ray tube.
Claims (4)
1. the full semi-bridge switching circuit for medical high-frequency high voltage generator, this circuit is penetrated pipe with X ray and is connected, it is characterized in that, this circuit comprises handover module (1), driver module (2), conversion module (3) and high-voltage rectifying module (4), described driver module (2) input is connected with handover module (1), output is connected with conversion module (3), described high-voltage rectifying module (4) input is connected with conversion module (3), and output is connected with X-ray tube;
Described handover module (1) is controlled driver module (2) and is carried out full semi-bridge alternation, described driver module (2) control change module (3) operating state, described conversion module (3) becomes high frequency square wave by the DC inversion of converter input and sends into the input of high-voltage rectifying module (4), through boosting, high voltage silicon stack rectification and high-voltage capacitance filtering becomes high voltage direct current after processing, and supplies with X-ray tube.
2. a kind of full semi-bridge switching circuit for medical high-frequency high voltage generator according to claim 1, it is characterized in that, described handover module (1) comprises triode V1, resistance R 11, resistance R 12, relay J 1 and diode D1, described resistance R 12 one end are connected with switch-over control signal, the other end is connected with the base stage of resistance R 11 one end and triode V1 respectively, the emitter of described triode V1, the equal ground connection of resistance R 11 other end, the anode of described diode D1 is connected with the collector electrode of triode V1, negative electrode is connected with supply power voltage VCC, relay J 1 is connected in parallel on diode D1 two ends,
Described switch-over control signal is by triode V1 control relay J1 power on/off, and then control driver module (2) carries out full half-bridge switching, relay J 1 afterflow when described diode D1 turn-offs for triode V1.
3. a kind of full semi-bridge switching circuit for medical high-frequency high voltage generator according to claim 2, it is characterized in that, described conversion module (3) comprises four power field effect pipe S1, S2, S3, S4, described driver module (2) comprises voltage controlled oscillator VCO, four resistance R 1, R2, R3, R4 and four optocoupler driver element N1, N2, N3, N4, described voltage controlled oscillator VCO output A is connected with one end of resistance R 3, output B is connected with one end of resistance R 1, described resistance R 2 one end, resistance R 4 is connected with relay J 1 respectively, described four resistance R 1, R2, R3, the R4 other end respectively with four optocoupler driver element N1, N2, N3, N4 input connects, described four optocoupler driver element N1, N2, N3, N4 output respectively with four power field effect pipe S1, S2, S3, S4 input connects,
When described conversion module (3) works in full-bridge state, resistance R 4 is connected with voltage controlled oscillator VCO output B, and resistance R 2 is connected with described voltage controlled oscillator VCO output A; When described conversion module (3) works in semi-bridge type converter, resistance R 4 and supply power voltage VCC one end, resistance R 2 is connected with the earth point of handover module (1).
4. a kind of full semi-bridge switching circuit for medical high-frequency high voltage generator according to claim 3, is characterized in that, described voltage controlled oscillator VCO output A is anti-phase with output B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410093009.1A CN103841739A (en) | 2014-03-13 | 2014-03-13 | Full bridge and half bridge switching circuit for medical high-frequency high-voltage generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410093009.1A CN103841739A (en) | 2014-03-13 | 2014-03-13 | Full bridge and half bridge switching circuit for medical high-frequency high-voltage generator |
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| CN103841739A true CN103841739A (en) | 2014-06-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104660044A (en) * | 2014-12-26 | 2015-05-27 | 西安华为技术有限公司 | Switching circuit and method and device for controlling switching circuit |
| CN105228326A (en) * | 2014-06-26 | 2016-01-06 | 锐珂（上海）医疗器材有限公司 | X ray generator and the method for monitoring x ray generator |
-
2014
- 2014-03-13 CN CN201410093009.1A patent/CN103841739A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105228326A (en) * | 2014-06-26 | 2016-01-06 | 锐珂（上海）医疗器材有限公司 | X ray generator and the method for monitoring x ray generator |
| CN105228326B (en) * | 2014-06-26 | 2018-10-23 | 锐珂（上海）医疗器材有限公司 | X-ray emitter and method for monitoring X-ray emitter |
| CN104660044A (en) * | 2014-12-26 | 2015-05-27 | 西安华为技术有限公司 | Switching circuit and method and device for controlling switching circuit |
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