CN103491697A - High-frequency high-voltage switching power supply device for industrial X-ray flaw detector - Google Patents
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Abstract
The invention discloses a high-frequency high-voltage switching power supply device for an industrial X-ray flaw detector. A control mode with a dual-high-frequency contravariant structure and amplitude adjusting as well as high-frequency lamp filaments is adopted, and a voltage controlled oscillator and drive circuits are used, so that a switching power supply can resist the interference of a power grid, and the stability of a DC (direct current) voltage is improved; the input of a voltage loop is controlled by adopting an amplitude adjusting mode, so that the voltage waveform of a voltage doubling circuit is more stable and is undistorted, and the circuit reliability is improved. The voltage is controlled by a dual-contravariant loop of AC (alternating current)-DC (direct current) and DC-AC, and a high-frequency full-bridge closed loop contravariant circuit is adopted for AC-DC, so that the output DC voltage is stable, and not influenced by the power grid, and finally stable direct current voltage is provided for a DC-AC closed loop circuit contravariant circuit. The input voltage of the whole device is adjusted through adjusting the output voltage of AC-DC, so that the device has the capability for resisting the oscillation of the power grid; a high-frequency dual-closed-loop lamp filament loop is adopted, and for the withstand voltage problem of a lamp filament transformer, a multi-stage transformer is adopted for coupling, so that the withstand voltage of each stage is reduced.
Description
Technical field
The present invention relates to a kind of switching power unit, relate in particular to the high-frequency high-voltage switch power source device that a kind of industrial X-ray diagnostic machine is used.
Background technology
European and American developed countries, traditional power frequency x-ray flaw detector is eliminated, the substitute is the x-ray flaw detector of the high-frequency and high-voltage power supply of superior performance, the domestic market demand also just changes towards this direction, but the high frequency and high voltage power supply device that imported product configures is expensive, restrict the expansion application of this class defectoscope.
The circuit that the high frequency and high voltage power supply device of current this purposes adopts is first the 220V AC power supplies to be rectified into to the 310V direct current by the rectifying bridge type circuit, give inverter circuit by direct current again, the pulse modulation technology of PWM by inverter circuit is controlled the output voltage of inversion, again inverter output voltage is passed to main transformer, main transformer connects voltage doubling rectifing circuit again, finally export high pressure, thereby realize the control of tube voltage.Heater chain Converting Unit and high tension loop are similar, and just rectification after filament transformer output, then directly connect the X-ray tube filament, there is no voltage multiplying rectifier.But, due to the X-ray tube plus earth, filament transformer is connected on high-pressure side, high to the requirement of withstand voltage of filament transformer.Due to above-mentioned circuit structure, make generator higher to the power supply quality requirements of place electrical network, but the power factor of the power plant of most domestic is not high, can cause the output of high pressure generator unstable, have a strong impact on the stability of Voltage-output, reduce the X-ray tube image quality, affect the user and use.The output voltage of high-frequency high-voltage switch power source is finally the two ends that are added in X-ray tube, from but X-ray tube produces X ray, different magnitudes of voltage can produce the different X ray of wavelength, but because the ripple of Voltage-output is large, can produce the X ray of useless wavelength simultaneously, disturb the definition of imaging.Solving the large method of ripple is exactly to improve the frequency of the switch of main inverter circuit, and frequency is higher, and ripple is less.
Summary of the invention
The problem existed for existing high-frequency high-voltage switch power source device, the invention provides a kind of control mode that adopts two high-frequency inversion structures, amplitude modulation and high frequency filament, can improve the high-frequency high-voltage switch power source device that the industrial X-ray diagnostic machine of DC voltage stability degree and circuit reliability is used.
Solve the problems of the technologies described above taked concrete technical measures as follows:
The high-frequency high-voltage switch power source device that a kind of industrial X-ray diagnostic machine is used, it is characterized in that: its circuit consists of two closed loop voltage circuits and the two closed loop filament loops of high frequency, wherein: two closed loop voltage circuits are comprised of two inversion closed loop voltage circuits of AC-DC and DC-AC, in first order AC-DC closed loop voltage circuit, alternating current 220V, the line voltage of 50Hz is connected with rectifier bridge DZ2, the output of rectifier bridge DZ2 connects electrochemical capacitor C2, the positive pole of electrochemical capacitor C2 connects insulated gate bipolar transistor Q1, Q2, the negative pole of electrochemical capacitor C2 connects insulated gate bipolar transistor Q5, Q6, by 4 insulated gate bipolar transistor Q1, Q2, Q5, Q6 forms first order full bridge inverter, the output of first order full bridge inverter connects the elementary of high frequency transformer T1 through capacitance C1, two groups of secondary coils of high frequency transformer T1 connect respectively rectifier bridge DZ1 and DZ3, the output of rectifier bridge DZ1 connects filter inductance L1 and filter capacitor C3, the output of rectifier bridge DZ3 connects filter inductance L2 and filter capacitor C4, filter inductance L2 connects capacitor filtering C3, two groups of direct current output series connection, filter inductance L1 is positive output, filter capacitor C4 is negative output through shunt R6, filter inductance L1 connects sampling resistor R1, in the DC-AC closed loop voltage circuit of the second level, the positive output of first order AC-DC closed loop voltage circuit connects insulated gate bipolar transistor Q3 and Q4, negative output connects insulated gate bipolar transistor Q7 and Q8, by insulated gate bipolar transistor Q3, Q4, Q7, Q8 forms second level full bridge inverter, the output of second level full bridge inverter connects the elementary of main transformer T2, the secondary connection voltage doubling rectifier module BY1 of main transformer T2, the sampled point that one end of T2 level of main transformer is electric current, voltage doubling rectifier module BY1 is connected with voltage doubling rectifier module BY2, voltage doubling rectifier module BY2 is connected with voltage doubling rectifier module BY3, voltage doubling rectifier module BY3 is connected with voltage doubling rectifier module BY4, voltage doubling rectifier module BY4 output connects sampling resistor R3, the sampled point that sampling resistor R3 is voltage, the output of voltage doubling rectifier module BY4 connects current-limiting resistance R4, current-limiting resistance R4 and current-limiting resistance R7, current-limiting resistance R8 series connection, current-limiting resistance R8 connects the negative electrode large focal spot filament R9 of X-ray tube and the common point of little focus filament R10, ray tube anode ground connection,
In the two closed loop filament loops of high frequency: three transformer T11, T12, T13 forms the large focal spot filament transformer, three transformer T14, T15, T16 forms little focus filament transformer, the positive pole of 48V Switching Power Supply connects power field effect pipe Q11 and Q12, negative pole connects power field effect pipe Q13 and Q14, power field effect pipe Q11, Q12, Q13 and Q14 form the full-bridge inverting heater chain, output one end of full-bridge inverting heater chain connects the intermediate contact of focus transfer relay K1, the normally-closed contact of focus transfer relay K1 connects the elementary end of large focal spot filament transformer T10, the normally opened contact of focus transfer relay K1 connects the elementary end of little focus filament transformer T14 simultaneously, the elementary other end of large focal spot filament transformer T11 is connected with the elementary other end of little focus filament transformer T14 and is connected to the secondary of sampling transformer T10, the other end of T10 level of sampling transformer is connected to the other end of full-bridge inverting heater chain output, the elementary of sampling transformer T10 is the sampled point of interior ring control loop, the secondary connection large focal spot filament transformer T12's of large focal spot filament transformer T11 is elementary, the secondary connection large focal spot filament transformer T13's of large focal spot filament transformer T12 is elementary, the secondary output of large focal spot filament transformer T13 is connected to rectifier diode D1 and D2, become direct current to be connected on the large focal spot filament R11 of X-ray tube AC rectification, the little focus filament transformer T15's of secondary connection of little focus filament transformer T14 is elementary, the little focus filament transformer T16's of secondary connection of little focus filament transformer T15 is elementary, secondary rectifier diode D3 and the D4 of being connected to of little focus filament transformer T16, become direct current to be connected on the little focus filament R12 of X-ray tube AC rectification.
Good effect of the present invention: the present invention adopts the control mode of two high-frequency inversion structures, amplitude modulation and high frequency filament, use voltage-controlled concussion and drive circuit, redesign each functional circuit, make Switching Power Supply can resist the interference of electrical network, simultaneously owing to adopting the high-frequency inversion technology, voltage circuit 45K, filament loop 50K have obtained less ripple coefficient, have improved the stability of direct voltage.Voltage circuit adopts the amplitude modulation mode to carry out control inputs, the voltage waveform of voltage-multiplying circuit is more stablized undistorted, improves the reliability of circuit.Use AC-DC, two inversion circuits of DC-AC are controlled voltage, and wherein first order AC-DC adopts high frequency full-bridge closed loop inverter circuit, make the DC voltage stability of its output, be not subject to the impact of power network fluctuation, provide galvanic current to press to second level DC-AC closed loop voltage circuit inverter circuit.Then by regulating the output voltage of first order AC-DC high frequency full-bridge closed loop inverter circuit, regulate the input voltage of whole equipment, it the is had ability of opposing power network fluctuation.Adopt the two closed loop filament loops of high frequency, the problem of withstand voltage employing multistage transformer coupling for filament transformer, reduce the withstand voltage of every one-level.
The accompanying drawing explanation
Fig. 1 is voltage circuit theory diagram of the present invention;
Fig. 2 is voltage circuit circuit theory diagrams of the present invention;
Fig. 3 is the output waveform of main inverter in the present invention;
Fig. 4 is filament loop theory diagram of the present invention;
Fig. 5 is filament loop circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is elaborated.
The high-frequency high-voltage switch power source device that a kind of industrial X-ray diagnostic machine is used, as shown in Figures 1 to 5, its circuit consists of two closed loop voltage circuits and the two closed loop filament loops of high frequency, wherein: two closed loop voltage circuits are comprised of two inversion closed loop voltage circuits of AC-DC and DC-AC, in first order AC-DC closed loop voltage circuit, alternating current 220V, the line voltage of 50Hz is connected with rectifier bridge DZ2, the output of rectifier bridge DZ2 connects electrochemical capacitor C2, the positive pole of electrochemical capacitor C2 connects insulated gate bipolar transistor Q1, Q2, the negative pole of electrochemical capacitor C2 connects insulated gate bipolar transistor Q5, Q6, by 4 insulated gate bipolar transistor Q1, Q2, Q5, Q6 forms first order full bridge inverter, the output of first order full bridge inverter connects the elementary of high frequency transformer T1 through capacitance C1, two groups of secondary coils of high frequency transformer T1 connect respectively rectifier bridge DZ1 and DZ3, the output of rectifier bridge DZ1 connects filter inductance L1 and filter capacitor C3, the output of rectifier bridge DZ3 connects filter inductance L2 and filter capacitor C4, filter inductance L2 connects capacitor filtering C3, two groups of direct current output series connection, filter inductance L1 is positive output, filter capacitor C4 is negative output through shunt R6, filter inductance L1 connects sampling resistor R1, in the DC-AC closed loop voltage circuit of the second level, the positive output of first order AC-DC closed loop voltage circuit connects insulated gate bipolar transistor Q3 and Q4, negative output connects insulated gate bipolar transistor Q7 and Q8, by insulated gate bipolar transistor Q3, Q4, Q7, Q8 forms second level full bridge inverter, the output of second level full bridge inverter connects the elementary of main transformer T2, the secondary connection voltage doubling rectifier module BY1 of main transformer T2, the sampled point that one end of T2 level of main transformer is electric current, voltage doubling rectifier module BY1 is connected with voltage doubling rectifier module BY2, voltage doubling rectifier module BY2 is connected with voltage doubling rectifier module BY3, voltage doubling rectifier module BY3 is connected with voltage doubling rectifier module BY4, voltage doubling rectifier module BY4 output connects sampling resistor R3, the sampled point that sampling resistor R3 is voltage, the output of voltage doubling rectifier module BY4 connects current-limiting resistance R4, current-limiting resistance R4 and current-limiting resistance R7, current-limiting resistance R8 series connection, current-limiting resistance R8 connects the negative electrode large focal spot filament R9 of X-ray tube and the common point of little focus filament R10, ray tube anode ground connection,
In the two closed loop filament loops of high frequency: three transformer T11, T12, T13 forms the large focal spot filament transformer, three transformer T14, T15, T16 forms little focus filament transformer, the positive pole of 48V Switching Power Supply connects power field effect pipe Q11 and Q12, negative pole connects power field effect pipe Q13 and Q14, power field effect pipe Q11, Q12, Q13 and Q14 form the full-bridge inverting heater chain, output one end of full-bridge inverting heater chain connects the intermediate contact of focus transfer relay K1, the normally-closed contact of focus transfer relay K1 connects the elementary end of large focal spot filament transformer T10, the normally opened contact of focus transfer relay K1 connects the elementary end of little focus filament transformer T14 simultaneously, the elementary other end of large focal spot filament transformer T11 is connected with the elementary other end of little focus filament transformer T14 and is connected to the secondary of sampling transformer T10, the other end of T10 level of sampling transformer is connected to the other end of full-bridge inverting heater chain output, the elementary of sampling transformer T10 is the sampled point of interior ring control loop, the secondary connection large focal spot filament transformer T12's of large focal spot filament transformer T11 is elementary, the secondary connection large focal spot filament transformer T13's of large focal spot filament transformer T12 is elementary, the secondary output of large focal spot filament transformer T13 is connected to rectifier diode D1 and D2, become direct current to be connected on the large focal spot filament R11 of X-ray tube AC rectification, the little focus filament transformer T15's of secondary connection of little focus filament transformer T14 is elementary, the little focus filament transformer T16's of secondary connection of little focus filament transformer T15 is elementary, secondary rectifier diode D3 and the D4 of being connected to of little focus filament transformer T16, become direct current to be connected on the little focus filament R12 of X-ray tube AC rectification.
Voltage circuit of the present invention is to adopt double circle controling mode as can be seen from Figure 1, and in first order AC-DC closed loop voltage circuit, first by alternating current 220V, the line voltage of 50Hz, by rectifier bridge DZ2, is rectified into the direct current of 310V.Then by the inverter circuit formed by insulated gate bipolar transistor Q1, Q2, Q5, Q6, the 310V DC inverter is become to high-frequency alternating current, and then by transformer T1, rectifier bridge DZ1 and DZ3, finally export the adjustable direct current of 0V-400V, the way of output adopts popular PWM pulse modulation technology at present.And the Voltage Feedback link is arranged herein, make the AC-DC circuit stable output of the first order, even the electrical network input voltage has fluctuation, due to the control that Closed Loop Control Unit is arranged, guarantee stable output, strong to the inhibition ability of disturbance, fast response time.Directly give the next stage inverter circuit by the 0-400V direct current again, DC inverter is become to the alternating current of 45kHz, give main transformer T2, main transformer T2 output connects voltage doubling rectifing circuit, finally exports the direct current of 20-450kV.Also have herein feedback element, final Voltage-output is fed back to control circuit, control circuit carries out the PID adjusting, forms large closed loop.Finally form double circle controling mode, interior ring, to electrical network or other disturbances, can play the effect of quick response, stable output.Outer shroud, improve the final response time of exporting, and improves stability and the repeatability of output.
This connected mode of the present invention, changing output is by changing the amplitude of second level inverter circuit input dc power, just do like this and the control gate of inverter circuit can be reached to maximum, without the pulsewidth of regulation output, only need adjusting amplitude, the benefit of doing like this is, can not cause wave distortion, little to the switching tube impact, so can adopt the efficiency of transmission of times hydraulic circuit of higher reverse frequency and its back of raising, can reduce the failure rate of voltage-multiplying circuit mesohigh electric capacity simultaneously.Inversion output waveform as shown in Figure 3.
Fig. 4 is the theory diagram of filament loop, as can be seen from the figure filament is also to adopt dicyclo to control, principle is as follows: the direct current of 48V is given by power field effect pipe Q11, Q12, the full-bridge inverting heater chain that Q13 and Q14 form, the alternating current that is reverse into 50kHz is given large focal spot filament transformer T11 or little focus filament transformer T14, then the output of large focal spot filament transformer T13 or little focus filament transformer T16 is through the rectifier bridge be comprised of rectifier diode D1 and rectifier diode D2 or the rectifier bridge be comprised of rectification diode D3 and rectifier diode D4, give filament.Fig. 5 is the circuit theory diagrams of filament loop, first closed loop is by sampling transformer T10 sampling, the primary voltage of large focal spot filament transformer T11 or little focus filament transformer T14 is controlled to output as feedback quantity, and the electric current that second closed loop is is Switching Power Supply by tube current is controlled output.The first closed loop has two effects, and one is in the situation that there is no tube current, to add the preheat curent that can regulate to filament.Second effect can be protected filament, such as having or not heater current, and filament limiting current etc.Second ring closure is to stablize tube current, improves precision and repeatability.
The output of filament inverter circuit is shown in Fig. 5 with the filament transformer circuit connecting mode, because filament transformer directly is connected with the X-ray tube negative electrode, voltage is very high, requirement of withstand voltage to transformer is very high, so in the present invention, filament transformer adopts the structure of multistage transformer series connection, as shown in Figure 5, T11, T12, T13 form the large focal spot filament transformer, T14, T15, T16 form little focus filament transformer, high voltage can be divided into to three equal parts, to reduce the voltage between adjacent winding, improve reliability.Finally output is rectified into to direct current, can makes the electronics cloud amount that produces on filament more stable, be conducive to export the stability of ray.Experiment showed, that voltage circuit adopts two closed loop design, has improved the inhibition ability to power network fluctuation.
Claims (1)
1. the high-frequency high-voltage switch power source device that industrial X-ray diagnostic machine is used, it is characterized in that: its circuit consists of two closed loop voltage circuits and the two closed loop filament loops of high frequency, wherein: two closed loop voltage circuits are comprised of two inversion closed loop voltage circuits of AC-DC and DC-AC, in first order AC-DC closed loop voltage circuit, alternating current 220V, the line voltage of 50Hz is connected with rectifier bridge DZ2, the output of rectifier bridge DZ2 connects electrochemical capacitor C2, the positive pole of electrochemical capacitor C2 connects insulated gate bipolar transistor Q1, Q2, the negative pole of electrochemical capacitor C2 connects insulated gate bipolar transistor Q5, Q6, by 4 insulated gate bipolar transistor Q1, Q2, Q5, Q6 forms first order full bridge inverter, the output of first order full bridge inverter connects the elementary of high frequency transformer T1 through capacitance C1, two groups of secondary coils of high frequency transformer T1 connect respectively rectifier bridge DZ1 and DZ3, the output of rectifier bridge DZ1 connects filter inductance L1 and filter capacitor C3, the output of rectifier bridge DZ3 connects filter inductance L2 and filter capacitor C4, filter inductance L2 connects capacitor filtering C3, two groups of direct current output series connection, filter inductance L1 is positive output, filter capacitor C4 is negative output through shunt R6, filter inductance L1 connects sampling resistor R1, in the DC-AC closed loop voltage circuit of the second level, the positive output of first order AC-DC closed loop voltage circuit connects insulated gate bipolar transistor Q3 and Q4, negative output connects insulated gate bipolar transistor Q7 and Q8, by insulated gate bipolar transistor Q3, Q4, Q7, Q8 forms second level full bridge inverter, the output of second level full bridge inverter connects the elementary of main transformer T2, the secondary connection voltage doubling rectifier module BY1 of main transformer T2, the sampled point that one end of T2 level of main transformer is electric current, voltage doubling rectifier module BY1 is connected with voltage doubling rectifier module BY2, voltage doubling rectifier module BY2 is connected with voltage doubling rectifier module BY3, voltage doubling rectifier module BY3 is connected with voltage doubling rectifier module BY4, voltage doubling rectifier module BY4 output connects sampling resistor R3, the sampled point that sampling resistor R3 is voltage, the output of voltage doubling rectifier module BY4 connects current-limiting resistance R4, current-limiting resistance R4 and current-limiting resistance R7, current-limiting resistance R8 series connection, current-limiting resistance R8 connects the negative electrode large focal spot filament R9 of X-ray tube and the common point of little focus filament R10, ray tube anode ground connection, in the two closed loop filament loops of high frequency: three transformer T11, T12, T13 forms the large focal spot filament transformer, three transformer T14, T15, T16 forms little focus filament transformer, the positive pole of 48V Switching Power Supply connects power field effect pipe Q11 and Q12, negative pole connects power field effect pipe Q13 and Q14, power field effect pipe Q11, Q12, Q13 and Q14 form the full-bridge inverting heater chain, output one end of full-bridge inverting heater chain connects the intermediate contact of focus transfer relay K1, the normally-closed contact of focus transfer relay K1 connects the elementary end of large focal spot filament transformer T10, the normally opened contact of focus transfer relay K1 connects the elementary end of little focus filament transformer T14 simultaneously, the elementary other end of large focal spot filament transformer T11 is connected with the elementary other end of little focus filament transformer T14 and is connected to the secondary of sampling transformer T10, the other end of T10 level of sampling transformer is connected to the other end of full-bridge inverting heater chain output, the elementary of sampling transformer T10 is the sampled point of interior ring control loop, the secondary connection large focal spot filament transformer T12's of large focal spot filament transformer T11 is elementary, the secondary connection large focal spot filament transformer T13's of large focal spot filament transformer T12 is elementary, the secondary output of large focal spot filament transformer T13 is connected to rectifier diode D1 and D2, become direct current to be connected on the large focal spot filament R11 of X-ray tube AC rectification, the little focus filament transformer T15's of secondary connection of little focus filament transformer T14 is elementary, the little focus filament transformer T16's of secondary connection of little focus filament transformer T15 is elementary, secondary rectifier diode D3 and the D4 of being connected to of little focus filament transformer T16, become direct current to be connected on the little focus filament R12 of X-ray tube AC rectification.
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| CN103731045A (en) * | 2014-01-17 | 2014-04-16 | 中国航空工业集团公司北京航空制造工程研究所 | High voltage power supply |
| CN104836440A (en) * | 2015-05-11 | 2015-08-12 | 常熟市东神电子器件有限公司 | Step type high-voltage power supply device |
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| CN113659841A (en) * | 2021-08-16 | 2021-11-16 | 苏州博思得电气有限公司 | Pulse control circuit, high voltage generator and ray imaging equipment |
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Application publication date: 20140101 |