CN204216775U - For the inverse changing driving circuit of x ray generator - Google Patents
For the inverse changing driving circuit of x ray generator Download PDFInfo
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- CN204216775U CN204216775U CN201420690700.3U CN201420690700U CN204216775U CN 204216775 U CN204216775 U CN 204216775U CN 201420690700 U CN201420690700 U CN 201420690700U CN 204216775 U CN204216775 U CN 204216775U
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Abstract
The utility model relates to a kind of inverse changing driving circuit for x ray generator, the driver module identical with four structures by inverter circuit is formed, each driver module is all made up of three parts: transformer, for pulse generator, high-speed photoelectric coupler, power amplification circuit provide power supply, there is provided a central shaft heads S as zero reference value simultaneously, guarantee that there is between the grid of each field effect transistor and source electrode stable voltage, transformer also plays the effect of electrical isolation, ensure that the stable of whole system; Photoelectric coupled circuit, paired pulses generator and inverter circuit carry out Phototube Coupling, and photoelectric coupled circuit makes the distortion in drive waveforms impact by paired pulses generator, thus ensure that inverter circuit and control circuit do not interfere with each other and steady operation; Power amplification circuit, for making fet switch more rapid, increasing the moment drive current on inverse changing driving circuit, thus carrying out fast charging and discharging to the interelectrode capacitance in the field effect transistor of inverter circuit when keeping voltage constant.
Description
Technical field
The utility model relates to a kind of inverter circuit, particularly relates to a kind of inverse changing driving circuit for x ray generator.
Background technology
Drive circuit is the interface of control circuit and main circuit, the effect of drive circuit is isolated and amplify with driving power device at control circuit output signal, drive circuit needs very high rapidity, simultaneously closely related with the reliability, efficiency etc. of whole x ray generator again.Therefore, drive circuit can not only provide certain driving power, and needs the ability with higher anti-interference and noise isolation.
Portable X-ray generator is that a kind of build is small and exquisite, take battery as the lightness mobile x-ray generating means of power supply.In x ray generator, DC power supply, after inverter circuit inversion, enters the boosting that step-up transformer carries out the first order, and step-up transformer time limit is connected with a times pressing plate carries out second time and boost, and voltage obtains required high pressure after the booster circuit of this two-stage.In x ray generator course of normal operation, times pressing plate is made up of high-voltage diode and high-voltage capacitance, characteristically aobvious capacitive.According to circuit theory, the electric capacity of identical capacitance, the energy stored under different terminal voltages meets following relation,
J=CU
2/2 （1）
From formula (1), same capacitor's capacity, different terminal voltage, square being directly proportional of capacitance stores energy and terminal voltage.According to above-mentioned relation, step-up transformer time limit is connected with a times pressing plate, and in the X-ray generator exposure starting stage, the electric capacity on times pressing plate is J=CU at the energy that will store instantaneously
2/ 2, and voltage U is step-up transformer time polygonal voltage.So, before exposure is initial, in several millisecond, need very large energy to meet the energy storage needs of high-voltage capacitance on times pressing plate.From ideal transformer, primary current I
1with secondary limit electric current I
2between pass be
I
1=n× I
2（2）
n=U
2/U
1 （3）
From (2), (3) formula
I
1=I
2× U
2/U
1（4）
U
2, U
1for secondary polygonal voltage and the original edge voltage of ideal transformer.
The turn ratio n=U of step-up transformer
2/ U
1relatively large, so in the X-ray generator exposure starting stage, the former limit of inverter circuit and step-up transformer creates very large rush of current, and the stability of large rush of current to inverter circuit of moment constitutes very large threat, cause step-up transformer running environment to worsen simultaneously, even make step-up transformer occur magnetic saturation.How under large rush of current, maintaining inverter circuit stable operation, this has higher requirement to inverse changing driving circuit.Because the quality of inverse changing driving circuit, directly determine the quality of inverter circuit running quality.
Current drive circuit generally adopts transformer isolation to drive or high voltage integrated circuit drives two kinds of modes.Transformer isolation drives, structure is simple, cost is low, isolation voltage can reach very high, transmission delay is little, and driving frequency is high, but when duty ratio changes, driving pulse amplitude is also corresponding to change, when duty ratio is more than 50%, its driving pulse amplitude may exceed field effect transistor gate drive voltage safe range, at this moment adopts transformer isolation to drive just improper.And high voltage integrated circuit drives, it adopts High-Speed Coupled Device as isolation signal transmission device, and the driving power after isolation adopts the mode of " charge pump ", but this driving cost is high, and peripheral circuit is complicated, and reliability also exists some problems.
Summary of the invention
The technical problems to be solved in the utility model is to provide a kind of inverse changing driving circuit for x ray generator, the peripheral circuit of this inverse changing driving circuit for x ray generator simplifies more, and the mutual interference effectively reduced between peripheral circuit and drive circuit, amplitude changes along with the change of duty ratio to avoid driving voltage, improves stability and reliability.The technical scheme adopted is as follows:
For the inverse changing driving circuit of x ray generator, comprise inverter circuit and drive circuit, inverter circuit comprises field effect transistor Q1, field effect transistor Q2, field effect transistor Q3, field effect transistor Q4, the source electrode of field effect transistor Q1 is electrically connected with the drain electrode of field effect transistor Q3, the source electrode of field effect transistor Q2 is electrically connected with the drain electrode of field effect transistor Q4, it is characterized in that: described drive circuit comprises the first driver module, the second driver module, the 3rd driver module and four-wheel drive module, first driver module, second driver module, 3rd driver module and four-wheel drive module include transformer, pulse generator, high-speed photoelectric coupler and power amplification circuit, transformer has two input L1, L2, positive output end M, negative output terminal N and central shaft heads S, pulse generator, high-speed photoelectric coupler, the power input of power amplification circuit respectively with the positive output end M of transformer, negative output terminal N is electrically connected, the earth terminal of high-speed photoelectric coupler is by earth resistance R100 ground connection, the signal input part of high-speed photoelectric coupler is electrically connected with the signal output part of pulse generator, the signal output part of high-speed photoelectric coupler is electrically connected with the signal input part of power amplification circuit, the signal output part G of the power amplification circuit of the first driver module is electrically connected with the grid of described field effect transistor Q1, and the central shaft heads S of the transformer of the first driver module is electrically connected with the source electrode of field effect transistor Q1, the signal output part G of the power amplification circuit of the second driver module is electrically connected with the grid of described field effect transistor Q2, and the central shaft heads S of the transformer of the second driver module is electrically connected with the source electrode of field effect transistor Q2, the signal output part G of the power amplification circuit of the 3rd driver module is electrically connected with the grid of described field effect transistor Q3, and the central shaft heads S of transformer of the 3rd driver module is electrically connected with the source electrode of field effect transistor Q3, the signal output part G of the power amplification circuit of four-wheel drive module is electrically connected with the grid of described field effect transistor Q4, and the central shaft heads S of the transformer of four-wheel drive module is electrically connected with the source electrode of field effect transistor Q4.
Above-mentioned transformer generally comprises primary coil, secondary coil and iron core, lead-out wire at primary coil two ends is as two inputs L1, L2, lead-out wire at secondary coil two ends is respectively as positive output end M, negative output terminal N, lead-out wire in the middle of secondary coil is as central shaft heads S, transformer belongs to prior art, here no longer describes in detail.
The current signal of input carries out amplifying and exporting when keeping voltage constant by above-mentioned power amplification circuit, and power amplification circuit belongs to prior art, here no longer describes in detail.
This inverse changing driving circuit is made up of the first driver module, the second driver module, the 3rd driver module and the four-wheel drive module that inverter circuit is identical with structure, arbitrary field effect transistor (being namely first brachium pontis or second brachium pontis that drive the arbitrary brachium pontis of inverter circuit) of each driver module difference inverter circuit, four driver modules are separate, do not interfere with each other.Each driver module is all made up of three parts: Part I is transformer, it is the power unit of inverse changing driving circuit, transformer is pulse generator, high-speed photoelectric coupler, power amplification circuit provides ± supply voltage of 15V, there is provided a central shaft heads S as zero reference value simultaneously, ± 15V is relative to zero reference value, guarantee each field effect transistor (Q1, Q2, Q3, Q4) there is between grid and source electrode stable 15V voltage, transformer also plays the effect of electrical isolation, namely peripheral circuit is isolated to the interference of inverse changing driving circuit, isolate again inverse changing driving circuit at work to the disturbance of peripheral circuit simultaneously, ensure that the stable of whole system, Part II is photoelectric coupled circuit, paired pulses generator and inverter circuit carry out Phototube Coupling, the field effect transistor (Q1, Q2, Q3, Q4) of inverter circuit in the process of switch because the existence of its stray inductance and electric capacity certainly leads to corresponding voltage or current interference pulsation, drive waveforms is caused to distort, photoelectric coupled circuit makes the distortion in drive waveforms impact by paired pulses generator, thus ensures that inverter circuit and control circuit do not interfere with each other and steady operation, Part III is power amplification circuit, for making field effect transistor (Q1, Q2, Q3, Q4) switch rapider, increase the moment drive current on inverse changing driving circuit when keeping voltage constant, thus fast charging and discharging is carried out to the interelectrode capacitance in the field effect transistor (Q1, Q2, Q3, Q4) of inverter circuit.
Along with the increase of field effect transistor (Q1, Q2, Q3, Q4) switching frequency, the switching loss of field effect transistor (Q1, Q2, Q3, Q4) increases thereupon.When inverter circuit stable operation, the power loss major part of field effect transistor (Q1, Q2, Q3, Q4) causes in scene effect pipe (Q1, Q2, Q3, Q4) switching process, so the switching speed improving field effect transistor (Q1, Q2, Q3, Q4) is most important for the loss of reduction field effect transistor.The mentality of designing of this inverse changing driving circuit is ensureing inverter circuit stable operation while, meet field effect transistor (Q1, Q2, Q3, Q4) can realize rapidly opening or turning off, namely the output instantaneous power of drive circuit is enough large, also meet drive circuit, isolation between inverter circuit and control circuit simultaneously, mutual interference is reduced to minimum therebetween.In order to reduce field effect transistor (Q1, Q2, Q3, Q4) switching loss, the design of this inverse changing driving circuit is started with from two aspects: first, the output of drive circuit is power amplification circuit, when keeping driving voltage constant, driver output electric current is instantaneous can reach maximum, this electric current fully can meet inverter circuit field effect transistor (Q1, Q2, Q3, Q4) switch needs, shorten the charging interval of field effect transistor (Q1, Q2, Q3, Q4) interelectrode capacitance, improve field effect transistor (Q1, Q2, Q3, Q4) switching speed; Secondly, drive circuit provides ± driving voltage of 15V, between the grid that ± 15V is added in field effect transistor (Q1, Q2, Q3, Q4) respectively and source electrode, the setting of-15V driving voltage can be shortened field effect transistor (Q1, Q2, Q3, Q4) turn-off time and improve shutoff reliability.
From the above analysis, this inverse changing driving circuit had both had the advantage of electrical isolation, employed again high-speed photoelectric coupler and made control signal and drive singal carry out Phototube Coupling, thus effectively reduce the mutual interference between peripheral circuit and drive circuit; Due to the setting of transformer central shaft heads S, thus meet Width funtion input, ± 15V constant output, driving voltage is constant is ± 15V, and amplitude changes along with the change of duty ratio to avoid driving voltage; Inverse changing driving circuit uses same voltage source, like this can effective peripheral circuits, increases circuit reliability.
As preferred version of the present utility model, described first driver module, the second driver module, the 3rd driver module and four-wheel drive module all also comprise RC circuit, RC circuit comprises electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, resistance R200 and resistance R300, and the capacity of electric capacity C1, electric capacity C2 is greater than the capacity of electric capacity C3, electric capacity C4; The two ends of electric capacity C1, electric capacity C3, resistance R200 are electrically connected with described positive output end M and central shaft heads S respectively; The two ends of electric capacity C2, electric capacity C4, resistance R300 are electrically connected with described negative output terminal N and central shaft heads S respectively.RC circuit is arranged on positive output end M, negative output terminal N(± 15V) and central shaft heads S between, for absorbing the voltage or current disturbing that field effect transistor in switching process, stray inductance and parasitic capacitance produces, guarantee the burning voltage of positive output end, negative output terminal maintenance ± 15V, be the voltage disturbance providing drive current support when field effect transistor is opened and suppress gate pole stray inductance to produce simultaneously; Wherein, electric capacity C1, C2 that the capacity in RC circuit is larger are that field effect transistor opens the electric current that affords redress, and shorten field effect transistor service time, reduce field effect transistor turn-on consumption; Determined by the work characteristics of x ray generator, exposure initial stage high pressure generator main circuit there is very large rush of current, electric capacity C1, C2 that capacity in RC circuit is larger play the effect of considering and removing low frequency wave, can be good at slowing down impact when rush of current runs inverter circuit, and keep inverter circuit stable operation; Electric capacity C3, C4 that in RC circuit, capacity is less play the effect of filter high-frequency ripple, further and keep inverter circuit stable operation; Inverse changing driving circuit is divided into four tunnels, each road is independent mutually, do not interfere with each other, and, the equal chain of gate pole of each Lu Douyou is connected to RC circuit, guarantee the open-minded of field effect transistor stability and high efficiency further, greatly reduce the upper and lower field effect transistor of the same brachium pontis of inverse changing driving circuit and open caused short circuit accident simultaneously.
Compared with prior art, tool has the following advantages the utility model:
This inverse changing driving circuit had both had the advantage of electrical isolation, employed again high-speed photoelectric coupler and made control signal and drive singal carry out Phototube Coupling, thus effectively reduce the mutual interference between peripheral circuit and drive circuit; Due to the setting of transformer central shaft heads S, thus meet Width funtion input, ± 15V constant output, driving voltage is constant is ± 15V, and amplitude changes along with the change of duty ratio to avoid driving voltage; Inverse changing driving circuit uses same voltage source, like this can effective peripheral circuits, increases circuit reliability.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model preferred implementation.
Embodiment
Be described further below in conjunction with accompanying drawing and preferred implementation of the present utility model.
As shown in Figure 1, this inverse changing driving circuit for x ray generator, comprise inverter circuit 1 and drive circuit 2, inverter circuit 1 comprises field effect transistor Q1, field effect transistor Q2, field effect transistor Q3, field effect transistor Q4, the source electrode of field effect transistor Q1 is electrically connected with the drain electrode of field effect transistor Q3, and the source electrode of field effect transistor Q2 is electrically connected with the drain electrode of field effect transistor Q4, drive circuit 2 comprises the first driver module 201, second driver module 202, the 3rd driver module 203 and four-wheel drive module 204, first driver module 201, second driver module 202, 3rd driver module 203 and four-wheel drive module 204 include transformer 2011, pulse generator 2012, high-speed photoelectric coupler 2013, power amplification circuit 2014 and RC circuit 2015, transformer 2011 has two input L1, L2, positive output end M, negative output terminal N and central shaft heads S, pulse generator 2012, high-speed photoelectric coupler 2013, the power input of power amplification circuit 2014 respectively with the positive output end M of transformer 2011, negative output terminal N is electrically connected, the earth terminal of high-speed photoelectric coupler is by earth resistance R100 ground connection, the signal input part of high-speed photoelectric coupler 2013 is electrically connected with the signal output part of pulse generator 2012, the signal output part of high-speed photoelectric coupler 2013 is electrically connected with the signal input part of power amplification circuit 2014, the signal output part G of the power amplification circuit 2014 of the first driver module 201 is electrically connected with the grid of field effect transistor Q1, and the central shaft heads S of transformer 2011 of the first driver module 201 is electrically connected with the source electrode of field effect transistor Q1, the signal output part G of the power amplification circuit 2014 of the second driver module 202 is electrically connected with the grid of field effect transistor Q2, and the central shaft heads S of transformer 2011 of the second driver module 202 is electrically connected with the source electrode of field effect transistor Q2, the signal output part G3 of the power amplification circuit 2014 of the 3rd driver module 203 is electrically connected with the grid of field effect transistor Q3, and the central shaft heads S of transformer 2011 of the 3rd driver module 203 is electrically connected with the source electrode of field effect transistor Q3, the signal output part G of the power amplification circuit 2014 of four-wheel drive module 204 is electrically connected with the grid of field effect transistor Q4, and the central shaft heads S of transformer 2011 of four-wheel drive module 204 is electrically connected with the source electrode of field effect transistor Q4, RC circuit 2015 comprises electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, resistance R200 and resistance R300, and the capacity of electric capacity C1, electric capacity C2 is greater than the capacity of electric capacity C3, electric capacity C4, the two ends of electric capacity C1, electric capacity C3, resistance R200 are electrically connected with positive output end M and central shaft heads S respectively, the two ends of electric capacity C2, electric capacity C4, resistance R300 are electrically connected with negative output terminal N and central shaft heads S respectively.
This inverse changing driving circuit for x ray generator is when applying, load 3(X ray generator) one end be connected between the source electrode of field effect transistor Q1 and the grid of field effect transistor Q3, load 3(X ray generator) one end be connected between the source electrode of field effect transistor Q2 and the grid of field effect transistor Q4.
Above-mentioned transformer 2011 generally comprises primary coil, secondary coil and iron core, lead-out wire at primary coil two ends is as two inputs L1, L2, lead-out wire at secondary coil two ends is respectively as positive output end M, negative output terminal N, and the lead-out wire in the middle of secondary coil is as central shaft heads S.
The current signal of input carries out amplifying and exporting when keeping voltage constant by above-mentioned power amplification circuit 2014.
Of the present utility modelly realize principle and technique effect is as follows:
This inverse changing driving circuit is made up of the first driver module 201, second driver module 202, the 3rd driver module 203 and the four-wheel drive module 204 that inverter circuit is identical with structure, arbitrary field effect transistor (Q1, Q2, Q3, Q4) (being namely first brachium pontis or second brachium pontis that drive the arbitrary brachium pontis of inverter circuit) of each driver module difference inverter circuit, four driver modules are separate, do not interfere with each other.Each driver module is all made up of three parts: Part I is transformer 2011, it is the power unit of inverse changing driving circuit, transformer 2011 is pulse generator 2012, high-speed photoelectric coupler 2013, power amplification circuit 2014 provides ± supply voltage of 15V, there is provided a central shaft heads S as zero reference value simultaneously, ± 15V is relative to zero reference value, guarantee each field effect transistor (Q1, Q2, Q3, Q4) there is between grid and source electrode stable 15V voltage, transformer 2011 also plays the effect of electrical isolation, namely peripheral circuit is isolated to the interference of inverse changing driving circuit, isolate again inverse changing driving circuit at work to the disturbance of peripheral circuit simultaneously, ensure that the stable of whole system, Part II is photoelectric coupled circuit, paired pulses generator 2012 and inverter circuit 1 carry out Phototube Coupling, the field effect transistor (Q1, Q2, Q3, Q4) of inverter circuit 1 in the process of switch because the existence of its stray inductance and electric capacity certainly leads to corresponding voltage or current interference pulsation, drive waveforms is caused to distort, photoelectric coupled circuit makes the distortion in drive waveforms impact by paired pulses generator 2012, thus ensures that inverter circuit 1 and control circuit do not interfere with each other and steady operation, Part III is power amplification circuit, for making field effect transistor (Q1, Q2, Q3, Q4) switch rapider, increase the moment drive current on inverse changing driving circuit when keeping voltage constant, thus fast charging and discharging is carried out to the interelectrode capacitance in the field effect transistor (Q1, Q2, Q3, Q4) of inverter circuit.
In addition, RC circuit 2015 is arranged on positive output end M, negative output terminal N(± 15V) and central shaft heads S between, for absorbing the voltage or current disturbing that field effect transistor (Q1, Q2, Q3, Q4) in switching process, stray inductance and parasitic capacitance produces, guarantee the burning voltage of positive output end, negative output terminal maintenance ± 15V, be the voltage disturbance providing drive current support when field effect transistor (Q1, Q2, Q3, Q4) is opened and suppress gate pole stray inductance to produce simultaneously; Wherein, electric capacity C1, C2 that the capacity in RC circuit 2015 is larger are that field effect transistor opens the electric current that affords redress, and shorten field effect transistor service time, reduce field effect transistor turn-on consumption; Determined by the work characteristics of x ray generator, exposure initial stage high pressure generator main circuit there is very large rush of current, electric capacity C1, C2 that capacity in RC circuit 2015 is larger play the effect of considering and removing low frequency wave, can be good at slowing down impact when rush of current runs inverter circuit 1, and keep inverter circuit 1 stable operation; Electric capacity C3, C4 that in RC circuit 2015, capacity is less play the effect of filter high-frequency ripple, further and keep inverter circuit 1 stable operation; Inverse changing driving circuit is divided into four tunnels, each road is independent mutually, do not interfere with each other, and, the equal chain of gate pole of each Lu Douyou is connected to RC circuit 2015, guarantee the open-minded of field effect transistor (Q1, Q2, Q3, Q4) stability and high efficiency further, greatly reduce the upper and lower field effect transistor of the same brachium pontis of inverse changing driving circuit (Q1, Q2, Q3, Q4) and open caused short circuit accident simultaneously.
In addition; it should be noted that, the specific embodiment described in this specification, its each several part title etc. can be different; all equivalences of doing according to structure, feature and the principle described in the utility model inventional idea or simple change, be included in the protection range of the utility model patent.The utility model person of ordinary skill in the field can make various amendment or supplements or adopt similar mode to substitute to described specific embodiment; only otherwise depart from structure of the present utility model or surmount this scope as defined in the claims, protection range of the present utility model all should be belonged to.
Claims (2)
1. for the inverse changing driving circuit of x ray generator, comprise inverter circuit and drive circuit, inverter circuit comprises field effect transistor Q1, field effect transistor Q2, field effect transistor Q3, field effect transistor Q4, the source electrode of field effect transistor Q1 is electrically connected with the drain electrode of field effect transistor Q3, the source electrode of field effect transistor Q2 is electrically connected with the drain electrode of field effect transistor Q4, it is characterized in that: described drive circuit comprises the first driver module, the second driver module, the 3rd driver module and four-wheel drive module, first driver module, second driver module, 3rd driver module and four-wheel drive module include transformer, pulse generator, high-speed photoelectric coupler and power amplification circuit, transformer has two input L1, L2, positive output end M, negative output terminal N and central shaft heads S, pulse generator, high-speed photoelectric coupler, the power input of power amplification circuit respectively with the positive output end M of transformer, negative output terminal N is electrically connected, the earth terminal of high-speed photoelectric coupler is by earth resistance R100 ground connection, the signal input part of high-speed photoelectric coupler is electrically connected with the signal output part of pulse generator, the signal output part of high-speed photoelectric coupler is electrically connected with the signal input part of power amplification circuit, the signal output part G of the power amplification circuit of the first driver module is electrically connected with the grid of described field effect transistor Q1, and the central shaft heads S of the transformer of the first driver module is electrically connected with the source electrode of field effect transistor Q1, the signal output part G of the power amplification circuit of the second driver module is electrically connected with the grid of described field effect transistor Q2, and the central shaft heads S of the transformer of the second driver module is electrically connected with the source electrode of field effect transistor Q2, the signal output part G of the power amplification circuit of the 3rd driver module is electrically connected with the grid of described field effect transistor Q3, and the central shaft heads S of transformer of the 3rd driver module is electrically connected with the source electrode of field effect transistor Q3, the signal output part G of the power amplification circuit of four-wheel drive module is electrically connected with the grid of described field effect transistor Q4, and the central shaft heads S of the transformer of four-wheel drive module is electrically connected with the source electrode of field effect transistor Q4.
2. as claimed in claim 1 for the inverse changing driving circuit of x ray generator, it is characterized in that: described first driver module, the second driver module, the 3rd driver module and four-wheel drive module all also comprise RC circuit, RC circuit comprises electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, resistance R200 and resistance R300, and the capacity of electric capacity C1, electric capacity C2 is greater than the capacity of electric capacity C3, electric capacity C4; The two ends of electric capacity C1, electric capacity C3, resistance R200 are electrically connected with described positive output end M and central shaft heads S respectively; The two ends of electric capacity C2, electric capacity C4, resistance R300 are electrically connected with described negative output terminal N and central shaft heads S respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420690700.3U CN204216775U (en) | 2014-11-18 | 2014-11-18 | For the inverse changing driving circuit of x ray generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420690700.3U CN204216775U (en) | 2014-11-18 | 2014-11-18 | For the inverse changing driving circuit of x ray generator |
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| Publication Number | Publication Date |
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| CN204216775U true CN204216775U (en) | 2015-03-18 |
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|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377946A (en) * | 2014-11-18 | 2015-02-25 | 汕头市超声仪器研究所有限公司 | Inverter driving circuit for X-ray generator |
-
2014
- 2014-11-18 CN CN201420690700.3U patent/CN204216775U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377946A (en) * | 2014-11-18 | 2015-02-25 | 汕头市超声仪器研究所有限公司 | Inverter driving circuit for X-ray generator |
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Granted publication date: 20150318 Effective date of abandoning: 20170901 |