CN110545611B - Method for realizing grid control isolation and grid control circuit - Google Patents
Method for realizing grid control isolation and grid control circuit Download PDFInfo
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- CN110545611B CN110545611B CN201910732462.5A CN201910732462A CN110545611B CN 110545611 B CN110545611 B CN 110545611B CN 201910732462 A CN201910732462 A CN 201910732462A CN 110545611 B CN110545611 B CN 110545611B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05G—X-RAY TECHNIQUE
- H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
- H05G1/08—Electrical details
- H05G1/085—Circuit arrangements particularly adapted for X-ray tubes having a control grid
Abstract
The invention discloses a method for realizing grid control isolation and a grid control circuit. Firstly, generating a high-frequency square wave with adjustable frequency inside a high-voltage control end of a grid control circuit; setting a required period and duty ratio at a low-voltage control end of a grid control circuit to generate control pulses, and transmitting the control pulses to a high-voltage control end in an optical fiber mode to carry out reduction and phase inversion in sequence to obtain two pairs of control pulses which are complementarily output; respectively receiving a high-frequency square wave and two pairs of control pulses which are complementarily output in pairs, and modulating the high-frequency square wave into modulation pulses with the period and the duty ratio consistent with those of the control pulses; and isolating and rectifying the modulation pulse to obtain a driving pulse consistent with the period and the duty ratio of the control pulse so as to drive the gate control end of the X-ray bulb tube to be quickly opened and closed. The invention realizes the random adjustment of the pulse width and the duty ratio. And the problem of safety isolation caused by controlling the grid control end of the X-ray bulb tube to be switched on and off at high voltage is also solved.
Description
Technical Field
The invention relates to a method for realizing grid control isolation and a grid control circuit adopting the method.
Background
Currently, various medical X-ray devices on the market have high voltage generators and X-ray bulbs. The high voltage generator is used for generating kilovolt direct current high voltage which can be positive high voltage or negative high voltage. And loading direct-current high voltage between a cathode and an anode of the X-ray bulb tube, so that after a filament in the X-ray bulb tube is heated to generate electrons, the filament bombards an anode target surface under the acceleration action of a high-voltage electric field to generate X-rays. In practical application, the existence and nonexistence of the X-ray bulb tube are controlled according to a certain time sequence to achieve a certain application purpose.
In the prior art, an X-ray tube is generally provided with a gate control switch, and a high-voltage pulse is generated by controlling the high-voltage and rapid on-off loaded on a gate, so that the X-ray tube is rapidly turned on and off, and the purpose of emitting X-rays and stopping emitting X-rays is achieved.
Therefore, the performance of the grid control circuit of the X-ray bulb tube determines the performance index which can be achieved under the working mode of the X-ray pulse. In addition, the grid control end of the X-ray tube generally works at a very high voltage (several kilovolts to several tens of kilovolts), which has a high requirement on the safety isolation of the grid control circuit, and also needs to solve the problem of strong interference of sparking to the grid control circuit part during the high-voltage working process.
Disclosure of Invention
The invention aims to provide a method for realizing grid control isolation.
Another technical problem to be solved by the present invention is to provide a gate control circuit using the above method.
In order to achieve the purpose, the invention adopts the following technical scheme:
according to a first aspect of the embodiments of the present invention, there is provided a method for implementing gate-controlled isolation, including the steps of:
step S1: generating a high-frequency square wave with adjustable frequency inside a high-voltage control end of a grid control circuit;
step S2: setting a required period and duty ratio at a low-voltage control end of the grid control circuit to generate control pulses, and transmitting the control pulses to a high-voltage control end in an optical fiber mode to carry out reduction and phase inversion in sequence to obtain two pairs of control pulses which are complementarily output;
step S3: respectively receiving the high-frequency square waves and two pairs of control pulses which are complementarily output in pairs, and modulating the high-frequency square waves into modulation pulses with the period and the duty ratio consistent with those of the control pulses;
step S4: and isolating and rectifying the modulation pulse to obtain a driving pulse which is consistent with the period and the duty ratio of the control pulse output by the low-voltage control end so as to drive the grid control end of the X-ray bulb tube to be quickly opened and closed.
Preferably, the grid control circuit is provided with an oscillation unit for generating a preset duty ratio and frequency-adjustable high-frequency square wave inside a high-voltage control end of the grid control circuit.
Preferably, the control pulse generated by the low-voltage control end according to the required period and duty ratio drives an optical fiber transmitter connected with the low-voltage control end to convert an electrical signal into an optical signal, the optical signal is transmitted to the high-voltage control end through an optical fiber cable, and the optical signal is restored into the control pulse with the period and duty ratio completely the same as those of the low-voltage control end through an optical fiber receiver connected with the high-voltage control end.
Preferably, the grid control circuit is provided with an inverting unit for receiving the control pulse obtained by the restoration of the optical fiber receiver at the high-voltage control end and performing phase inversion on the control pulse to obtain two pairs of control pulses which are complementarily output.
Preferably, the inverting unit comprises a first inverter, a second inverter and a third inverter, wherein input ends of the first inverter and the third inverter are respectively connected with an output end of the fiber optic receiver, and an output end of the first inverter is connected with an input end of the second inverter; the first inverter and the second inverter are connected in series and are connected in parallel with the third inverter.
Preferably, a complementary pulse modulation unit is arranged in the gate control circuit and is used for respectively receiving the high-frequency square wave and the two pairs of control pulses which are complementarily output pairwise and modulating the high-frequency square wave into modulation pulses with the same period and duty ratio as the control pulses.
Preferably, the complementary pulse modulation unit comprises 2 groups of modulation modules corresponding to two pairs of control pulses which are complementarily output; each group of modulation modules is formed by connecting one end of a second resistor with a first light emitting diode in a forward direction and connecting one end of a third resistor with a second light emitting diode in a reverse direction respectively, the second resistor and the other end of the third resistor of each group of modulation modules are connected, and the other end of the third resistor of one group of modulation modules is connected with the other end of the second resistor of the other group of modulation modules.
Preferably, an isolation unit is arranged in the gate control circuit; the isolation unit comprises a high-frequency isolation pulse transformer and a plurality of optical coupling isolators corresponding to the modulation pulses, each optical coupling isolator is connected with one capacitor, the isolation unit is used for isolating a high-voltage power supply from low voltage and high voltage inside the high-voltage control end and transmitting the modulation pulses to the high-frequency isolation pulse transformer, and accordingly high voltage is isolated again.
Preferably, two rectifying units are further arranged in the grid control circuit, and each rectifying unit is connected with a corresponding high-frequency isolation pulse transformer.
Preferably, the grid-controlled switch of the X-ray bulb tube comprises two MOSFETs or two insulated grid type transistors which are cascaded in a push-pull mode;
and a bleeder unit is arranged between each MOSFET transistor or the insulated gate type transistor and the corresponding rectifying unit and used for rapidly switching off the MOSFET transistor or the insulated gate type transistor.
According to a second aspect of the embodiments of the present invention, there is provided a gate control circuit employing the above method; the grid control circuit comprises a low-voltage control end and a high-voltage control end, wherein the high-voltage control end comprises an oscillation unit, an inversion unit, a complementary pulse modulation unit, an isolation unit, a rectification unit and a discharge unit, the oscillation unit is connected with the complementary pulse modulation unit, the inversion unit is connected with the low-voltage control end in an optical fiber mode on one hand and is connected with the complementary pulse modulation unit on the other hand, the complementary pulse modulation unit is connected with the isolation unit, the isolation unit is connected with the rectification unit, the rectification unit is connected with the discharge unit, and the discharge unit is connected with the grid control end of the X-ray bulb tube;
the low-voltage control end is used for setting a required period and a required duty ratio so as to generate control pulses;
the oscillation unit is used for generating a high-frequency square wave with adjustable frequency inside the high-voltage control end;
the phase inversion unit is used for receiving the control pulse and performing phase inversion to obtain two pairs of control pulses which are complementarily output;
the complementary pulse modulation unit is used for receiving the high-frequency square waves and two pairs of control pulses which are complementarily output in pairs, and modulating the high-frequency square waves into modulation pulses which are consistent with the period and the duty ratio of the control pulses;
the isolation unit is used for isolating the modulation pulse;
the rectification unit is used for rectifying the modulation pulse to obtain a driving pulse which is consistent with the period and the duty ratio of the control pulse output by the low-voltage control end so as to drive the grid control end of the X-ray bulb tube to be quickly opened and closed;
and the discharge unit is used for quickly switching off the grid control end of the X-ray bulb tube.
According to the invention, the high-frequency square wave with adjustable frequency is generated in the high-voltage control end of the grid control circuit, and the control pulse generated by the low-voltage control end is transmitted to the high-voltage control end by adopting the single optical fiber, so that the high-voltage control end can modulate and rectify the high-frequency square wave into the driving pulse with the period and the duty ratio consistent with the control pulse, thus the control edge of the high voltage of the grid control end of the X-ray bulb tube can be quickly opened and closed, and the pulse width and the duty ratio can be arbitrarily adjusted. In addition, the invention also solves the problem of safety isolation caused by controlling the grid control end of the X-ray bulb tube to be switched on and off under high voltage.
Drawings
FIG. 1 is a flow chart of a gated isolation method provided by the present invention;
FIG. 2 is a schematic diagram of a gate control circuit according to the present invention;
fig. 3 is a schematic block diagram of a gate control circuit provided in the present invention.
Detailed Description
The technical contents of the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
It should be noted that the grid control isolation method provided by the present invention refers to a method for implementing the safe isolation of the grid control circuit of the X-ray tube. As shown in fig. 1, the method comprises the steps of:
step S1: generating a high-frequency square wave with adjustable frequency inside a high-voltage control end of a grid control circuit;
the oscillation unit is arranged in the grid control circuit, so that the preset duty ratio and the high-frequency square wave with adjustable frequency are generated in the high-voltage control end of the grid control circuit. The duty ratio and the frequency of the high-frequency square wave can be adjusted by adopting the oscillating unit according to the duty ratio and the frequency required by data transmission from the high-voltage control end to the low-voltage control end of the grid control circuit.
As shown in fig. 2, the oscillation unit may be implemented by using an RC oscillation unit composed of a first resistor R12, a first capacitor C5, and a voltage-controlled oscillator U8; the connection relationship of each part of the RC oscillating unit is as follows: one end of the first resistor R12 is connected to the frequency setting pin SET of the voltage-controlled oscillator U8 and one end of the first capacitor C5, respectively, the other end of the first resistor R12 is connected to an inverting unit (which will be described IN detail below) of the gate control circuit, the feedback input pin IN of the voltage-controlled oscillator U8 is connected to the power supply pin VCC and the 5V low voltage inside the high voltage control terminal of the voltage-controlled oscillator U8, respectively, and the pulse output pin OUT of the voltage-controlled oscillator U8 is connected to the input terminal of the complementary pulse modulation unit (which will be described IN detail below) of the gate control circuit; the ground pin GND of the voltage-controlled oscillator U8 and the other end of the first capacitor C5 are grounded, respectively. The first resistor R12, the first capacitor C5 and the voltage-controlled oscillator U8 are matched to generate the required high-frequency square wave; the duty ratio of the high-frequency square wave is set by a voltage-controlled oscillator U8, and the frequency of the high-frequency square wave is obtained by adjusting the values of a first resistor R12 and a first capacitor C5. For example, the duty ratio of the generated high-frequency square wave is set to be 50% by the voltage-controlled oscillator U8, and the frequency of the high-frequency square wave can be adjusted between the frequency range of 100KHz and 500KHz by adjusting the values of the first resistor R12 and the first capacitor C5.
In addition, in the present invention, the oscillation unit is not limited to the RC oscillation unit described above, and any oscillation unit that generates a high-frequency square wave with adjustable frequency inside the high-voltage control end of the gate control circuit may be implemented. For example, the generation of a high-frequency square wave with adjustable frequency inside the high-voltage control end of the gate control circuit can also be realized by using a bistable oscillator. The connection between the bistable oscillator, the first resistor R12 and the first capacitor C5 can be adjusted according to the actually selected bistable oscillator.
Step S2: setting a required period and duty ratio at a low-voltage control end of a grid control circuit to generate control pulses, and transmitting the control pulses to a high-voltage control end in an optical fiber mode to carry out reduction and phase inversion in sequence to obtain two pairs of control pulses which are complementarily output;
because the low-voltage control end of the grid control circuit is connected with the X-ray equipment (such as medical equipment) actually applied by a user, the control unit on the X-ray equipment can realize the setting of the required period and duty ratio on the low-voltage control end of the grid control circuit, and can generate corresponding control pulses according to the set period and duty ratio. The control unit on the X-ray equipment comprises a central processing unit, a programmable controller, a single chip microcomputer, a digital processor and the like. The period and duty ratio set by the low-voltage control end depend on the time (the time for which the high-level signal and the low-level signal received by the grid control end of the X-ray bulb tube) that the grid control end of the X-ray bulb tube needs to be opened and closed.
The low-voltage control end drives an optical fiber transmitter connected with the low-voltage control end to convert an electric signal into an optical signal according to control pulses generated by a required period and a required duty ratio, the optical signal is transmitted to the high-voltage control end of the grid control circuit through an optical fiber cable, and the optical signal is restored into control pulses with the period and the duty ratio completely the same as those of the low-voltage control end through an optical fiber receiver connected with the high-voltage control end.
By arranging the phase inversion unit in the grid control circuit, the control pulse obtained by restoring the optical fiber receiver at the high-voltage control end can be received, and the phase inversion is carried out on the control pulse to obtain two pairs of control pulses which are complementarily output. As shown in fig. 2, the inverting unit includes a first inverter U5A, a second inverter U5B, and a third inverter U5C, wherein input terminals of the first inverter U5A and the third inverter U5C are respectively connected to an output terminal of the fiber optic receiver, and an output terminal of the first inverter U5A is connected to an input terminal of the second inverter U5B; the first inverter U5A is connected in series with the second inverter U5B and is connected in parallel with the third inverter U5C, so that the control pulse obtained by restoring the optical fiber receiver at the high-voltage control end is subjected to phase inversion to obtain two pairs of control pulses which are complementarily output. In the step, the high voltage is effectively isolated in the process of transmitting the control pulse generated by the low-voltage control end of the grid control circuit to the high-voltage control end by using an optical fiber transmission mode, and the anti-sparking capacity of the grid control circuit is improved.
Step S3: respectively receiving the high-frequency square wave of the step S1 and the two pairs of control pulses which are complementarily output in pairs of the step S2, and modulating the high-frequency square wave into modulation pulses with the period and the duty ratio consistent with those of the control pulses;
by providing the complementary pulse modulation unit in the gate control circuit, it is possible to receive the high-frequency square wave of step S1 and the two pairs of control pulses of step S2 that are complementarily outputted two by two, respectively, and modulate the high-frequency square wave into modulation pulses that are in accordance with the period and duty ratio of the received control pulses. As shown in fig. 2, the complementary pulse modulation unit includes 2 sets of modulation modules corresponding to the two pairs of pairwise complementary output control pulses of step S2; each group of modulation modules is formed by connecting one end of a second resistor with a first light emitting diode in a forward direction and connecting one end of a third resistor with a second light emitting diode in a reverse direction respectively, the second resistor and the other end of the third resistor of each group of modulation modules are connected, and the other end of the third resistor of one group of modulation modules is connected with the other end of the second resistor of the other group of modulation modules. As shown in fig. 2, one ends of the resistor R1 and the resistor R10 are connected to an anode of one photodiode (forward connection), one ends of the resistor R5 and the resistor R11 are connected to a cathode of one photodiode (reverse connection), the other ends of the resistor R1, the resistor R10, the resistor R5 and the resistor R11 are connected to each other, each light emitting diode is connected to the oscillation unit of the gate control circuit, and each light emitting diode is also connected to the corresponding inverter of the inverter unit of the gate control circuit. And (3) respectively receiving the high-frequency square waves of the step S1 through 2 groups of modulation modules, respectively and correspondingly receiving the two pairs of control pulses which are complementarily output in pairs and are respectively and correspondingly received in the step S2, and modulating the high-frequency square waves into modulation pulses with the period and the duty ratio consistent with those of the received control pulses.
Step S4: and rectifying the modulation pulse to obtain a driving pulse which is consistent with the period and the duty ratio of the control pulse output by the low-voltage control end so as to drive the grid control end of the X-ray bulb tube to be quickly opened and closed.
Set up high frequency isolation pulse transformer respectively in grid control circuit, and a plurality of opto-coupler isolator corresponding with the modulation pulse of step S3, through being connected with a electric capacity respectively with every opto-coupler isolator, with realize the inside low pressure of high voltage power supply and grid control circuit 'S high-voltage control end, the isolation between the high pressure, and realize transmitting modulation pulse to high frequency isolation pulse transformer, make high pressure of keeping apart once more, can realize twice isolation through opto-coupler isolator and high frequency isolation pulse transformer, thereby improve grid control circuit' S whole withstand voltage progression. The high-frequency isolation pulse transformer can also drive a grid control end (grid control switch) of the grid control circuit. The high-frequency isolation pulse transformer can be replaced by a grid drive transformer.
As shown in fig. 2, taking the high-frequency isolation transformer as an example, the input ends of the optical isolators U1-U4 are connected to the output end of the complementary pulse modulation unit of the gate control circuit, the output ends of the optical isolators U1 and U2 are connected to the primary winding of the high-frequency isolation pulse transformer T1, and the output ends of the optical isolators U3 and U4 are connected to the primary winding of the high-frequency isolation pulse transformer T2. The modulation pulse in the step S3 is received through the optical coupling isolators U1-U4, the optical coupling isolators U1-U4 drive two ends of primary windings of the corresponding high-frequency isolation pulse transformers T1 and T2, the modulation pulse can be coupled to secondary windings of the high-frequency isolation pulse transformers T1 and T2 to be output, and therefore twice isolation is achieved.
Two rectifying units are also arranged in the gate control circuit, and each rectifying unit can be realized by adopting a rectifying chip (such as the rectifying chips U9 and U11 shown in FIG. 2). The input end of each rectifying unit is connected with the secondary side of the corresponding high-frequency isolation pulse transformer. Because the modulation pulse of step S3 is an ac pulse when not rectified, the modulation pulse (ac modulation pulse) output by the secondary winding of the high-frequency isolation pulse transformer is rectified into a dc modulation pulse by the rectifying unit, and a driving pulse with a period and a duty ratio consistent with those of the control pulse output by the low-voltage control terminal is obtained, so as to drive the gate control switch of the X-ray tube to be able to be turned on and off quickly.
Since the gate-controlled switch of the X-ray tube comprises two mosfet transistors (including NMOS transistors Q1 and Q5 or PMOS transistors shown in fig. 2) or two insulated gate transistors (IGBTs) cascaded in a push-pull manner. When the driving pulse is at a high level, the push-pull upper tube opens the lower tube and closes the lower tube, and the grid control of the X-ray bulb tube outputs high voltage; when the driving pulse is at a low level, the push-pull upper tube closes and opens the lower tube, and the grid control output of the X-ray bulb tube is 0; thus, a high-voltage grid control pulse synchronous with the control pulse of the low-voltage control end is obtained at the grid control output end of the X-ray bulb tube; namely, the control pulse of the low-voltage control end changes the period and the duty ratio, and the grid control end of the X-ray bulb tube outputs the high-voltage pulse with the same period and the same duty ratio.
In order to enable the gate-controlled switch of the X-ray tube to be turned off quickly, a bleeding unit may be provided between each mosfet transistor or insulated gate transistor and the corresponding rectifying unit, and the charge between the gates and sources of the transistors Q1 and Q5 is rapidly discharged through the bleeding unit, so that the transistors Q1 and Q5 are turned off quickly.
Each bleeder unit can be realized by connecting a bleeder chip and a voltage stabilizing diode in parallel. The input pin CN of each bleeder chip is connected with one output pin Q1 of the corresponding rectifier chip, the ground pin of each bleeder chip is connected with the other output pin Q2 of the corresponding rectifier chip, the output pin of each bleeder chip is connected with the cathode of the corresponding zener diode, the bleeder pin C of each bleeder chip is connected with the anode of the corresponding zener diode, and the zener diode is connected with the corresponding gate switch.
For example, bleeder chips U10 and U12 as shown in fig. 2; taking the bleeder chip U10 as an example for detailed description, the input pin CN of the bleeder chip U10 is connected to one output pin Q1 of the rectifier chip U9, the ground pin of the bleeder chip U10 is connected to the other output pin Q2 of the rectifier chip U9, the output pin of the bleeder chip U10 is connected to the cathode of the zener diode D5, the bleeder pin C of the bleeder chip U10 is connected to the anode of the zener diode D5, and the zener diode D5 is correspondingly connected to the gate and the source of the transistor Q1. The voltage stabilizing diode is used for stabilizing the voltage of the spike pulse to a certain range; the drain chip U10 is used to realize that the charge between the gate and the source of the corresponding transistor of the gate-controlled switch is quickly drained, so that the transistor is quickly turned off.
According to the grid control isolation method provided by the invention, the high-frequency square wave with adjustable frequency is generated in the high-voltage control end of the grid control circuit, and the control pulse generated by the low-voltage control end is transmitted to the high-voltage control end by adopting the single optical fiber, so that the high-voltage control end can modulate and rectify the high-frequency square wave into the driving pulse consistent with the period and the duty ratio of the control pulse, the control edge of the high voltage of the grid control end of the X-ray bulb tube can be quickly opened and quickly closed, and the pulse width and the duty ratio can be adjusted at will. In addition, the invention also solves the problem of safety isolation caused by controlling the grid control end of the X-ray bulb tube to be switched on and off under high voltage.
In addition, as shown in fig. 3, the invention also provides a gate control circuit adopting the method. The gate control circuit includes: low pressure control end 1, high pressure control end 2 includes: the X-ray tube comprises an oscillation unit 21, an inversion unit 22, a complementary pulse modulation unit 23, an isolation unit 24, a rectification unit 25 and a discharge unit 26, wherein the oscillation unit 21 is connected with the complementary pulse modulation unit 23, the inversion unit 22 is connected with a low-voltage control end 1 in an optical fiber mode, the complementary pulse modulation unit 23 is connected with the isolation unit 24, the isolation unit 24 is connected with the rectification unit 25, the rectification unit 25 is connected with the discharge unit 26, and the discharge unit 26 is connected with a grid control end of the X-ray tube. Wherein the content of the first and second substances,
and the low-voltage control terminal 1 is used for setting a required period and a required duty ratio so as to generate control pulses.
And the oscillating unit 21 is used for generating a high-frequency square wave with adjustable frequency inside the high-voltage control end of the grid control circuit.
And the phase inversion unit 22 is used for receiving the control pulse and performing phase inversion to obtain two pairs of control pulses which are output in a pairwise complementary manner.
And the complementary pulse modulation unit 23 is used for receiving the high-frequency square wave and two pairs of control pulses which are complementarily output pairwise, and modulating the high-frequency square wave into modulation pulses with the period and the duty ratio consistent with those of the control pulses.
And an isolation unit 24 for isolating the modulated pulses.
And the rectifying unit 25 is used for rectifying the modulation pulse to obtain a driving pulse which is consistent with the period and the duty ratio of the control pulse output by the low-voltage control end so as to drive the grid control end of the X-ray bulb tube to be quickly opened and closed.
And the bleeder unit 26 is used for rapidly switching off the grid control end of the X-ray bulb tube.
The structure and control principle of each part of the gate control circuit for realizing isolation based on the method for realizing gate control isolation provided by the invention have been described in detail in the steps of the method, and are not described again.
The method for realizing gate control isolation and the gate control circuit provided by the invention are explained in detail above. It will be apparent to those skilled in the art that any obvious modifications thereto can be made without departing from the true spirit of the invention, which is to be accorded the full scope of the claims herein.
Claims (11)
1. A method for realizing grid control isolation is characterized by comprising the following steps:
step S1: generating a high-frequency square wave with adjustable frequency inside a high-voltage control end of a grid control circuit;
step S2: setting a required period and duty ratio at a low-voltage control end of the grid control circuit to generate control pulses, and transmitting the control pulses to a high-voltage control end in an optical fiber mode to carry out reduction and phase inversion in sequence to obtain two pairs of control pulses which are complementarily output;
step S3: respectively receiving the high-frequency square waves and two pairs of control pulses which are complementarily output in pairs, and modulating the high-frequency square waves into modulation pulses with the period and the duty ratio consistent with those of the control pulses;
step S4: and isolating and rectifying the modulation pulse to obtain a driving pulse which is consistent with the period and the duty ratio of the control pulse output by the low-voltage control end so as to drive the grid control end of the X-ray bulb tube to be quickly opened and closed.
2. The method of implementing gated isolation of claim 1, wherein:
and an oscillating unit is arranged in the grid control circuit and used for generating a preset duty ratio and a high-frequency square wave with adjustable frequency in a high-voltage control end of the grid control circuit.
3. The method of implementing gated isolation of claim 1, wherein:
the control pulse generated by the low-voltage control end according to the required period and duty ratio drives an optical fiber transmitter connected with the low-voltage control end to convert an electric signal into an optical signal, the optical signal is transmitted to the high-voltage control end through an optical fiber cable, and the optical signal is restored into the control pulse with the period and duty ratio completely the same as those of the low-voltage control end through an optical fiber receiver connected with the high-voltage control end.
4. The method of implementing gated isolation of claim 1, wherein:
and the grid control circuit is provided with a phase reversal unit for receiving the control pulse obtained by the restoration of the optical fiber receiver at the high-voltage control end and carrying out phase reversal on the control pulse to obtain two pairs of control pulses which are complementarily output.
5. The method of implementing gated isolation of claim 4, wherein:
the inverting unit comprises a first inverter, a second inverter and a third inverter, wherein the input ends of the first inverter and the third inverter are respectively connected with the output end of the optical fiber receiver, and the output end of the first inverter is connected with the input end of the second inverter; the first inverter and the second inverter are connected in series and are connected in parallel with the third inverter.
6. The method of implementing gated isolation of claim 1, wherein:
and a complementary pulse modulation unit is arranged in the grid control circuit and is used for respectively receiving the high-frequency square waves and the two pairs of control pulses which are complementarily output pairwise and modulating the high-frequency square waves into modulation pulses with the same period and duty ratio as the control pulses.
7. The method of implementing gated isolation of claim 6, wherein:
the complementary pulse modulation unit comprises 2 groups of modulation modules corresponding to two pairs of control pulses which are complementarily output; each group of modulation modules is formed by connecting one end of a second resistor with a first light emitting diode in a forward direction and connecting one end of a third resistor with a second light emitting diode in a reverse direction respectively, the second resistor and the other end of the third resistor of each group of modulation modules are connected, and the other end of the third resistor of one group of modulation modules is connected with the other end of the second resistor of the other group of modulation modules.
8. The method of implementing gated isolation of claim 1, wherein:
an isolation unit is arranged in the grid control circuit; the isolation unit comprises a high-frequency isolation pulse transformer and a plurality of optical coupling isolators corresponding to the modulation pulses, each optical coupling isolator is connected with one capacitor, the isolation unit is used for isolating a high-voltage power supply from low voltage and high voltage inside the high-voltage control end and transmitting the modulation pulses to the high-frequency isolation pulse transformer, and accordingly high voltage is isolated again.
9. The method of implementing gated isolation of claim 1, wherein:
two rectifying units are further arranged in the grid control circuit, and each rectifying unit is connected with a corresponding high-frequency isolation pulse transformer.
10. The method of implementing gated isolation of claim 9, wherein:
the grid control switch of the X-ray bulb tube comprises two Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) or two insulated grid type transistors which are cascaded in a push-pull mode;
and a bleeder unit is arranged between each MOSFET transistor or the insulated gate type transistor and the corresponding rectifying unit and used for rapidly switching off the MOSFET transistor or the insulated gate type transistor.
11. A grid control circuit is characterized by comprising a low-voltage control end and a high-voltage control end, wherein the high-voltage control end comprises an oscillation unit, an inversion unit, a complementary pulse modulation unit, an isolation unit, a rectification unit and a discharge unit, the oscillation unit is connected with the complementary pulse modulation unit, the inversion unit is connected with the low-voltage control end in an optical fiber mode on one hand, and is connected with the complementary pulse modulation unit on the other hand, the complementary pulse modulation unit is connected with the isolation unit, the isolation unit is connected with the rectification unit, the rectification unit is connected with the discharge unit, and the discharge unit is connected with a grid control end of an X-ray bulb tube;
the low-voltage control end is used for setting a required period and a required duty ratio so as to generate control pulses;
the oscillation unit is used for generating a high-frequency square wave with adjustable frequency inside the high-voltage control end;
the phase inversion unit is used for receiving the control pulse and performing phase inversion to obtain two pairs of control pulses which are complementarily output;
the complementary pulse modulation unit is used for receiving the high-frequency square waves and two pairs of control pulses which are complementarily output in pairs, and modulating the high-frequency square waves into modulation pulses which are consistent with the period and the duty ratio of the control pulses;
the isolation unit is used for isolating the modulation pulse;
the rectification unit is used for rectifying the modulation pulse to obtain a driving pulse which is consistent with the period and the duty ratio of the control pulse output by the low-voltage control end so as to drive the grid control end of the X-ray bulb tube to be quickly opened and closed;
and the discharge unit is used for quickly switching off the grid control end of the X-ray bulb tube.
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| CN201910732462.5A CN110545611B (en) | 2019-08-09 | 2019-08-09 | Method for realizing grid control isolation and grid control circuit |
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| CN201910732462.5A CN110545611B (en) | 2019-08-09 | 2019-08-09 | Method for realizing grid control isolation and grid control circuit |
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