CN110912390A - Sparking current suppression method, circuit and control method of sparking current suppression circuit - Google Patents
Sparking current suppression method, circuit and control method of sparking current suppression circuit Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H02M1/00—Details of apparatus for conversion
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Abstract
The embodiment of the invention provides a method and a circuit for suppressing a sparking current, a control method of the circuit for suppressing the sparking current, a high-voltage circuit, a device for suppressing the sparking current, equipment and a computer readable storage medium. Wherein, strike sparks current suppression circuit includes: the detection unit is coupled to the controllable switch unit and is used for detecting the sparking current of the high-voltage circuit and controlling the controllable switch unit to be conducted under the condition that the sparking current is detected; the inductive energy storage unit is used for being connected in series with the output end of the output filtering unit of the high-voltage circuit; one end of the controllable switch unit is connected with the output end of the inductive energy storage unit, and the other end of the controllable switch unit is connected with the public end. By the aid of the bulb tube unit, the technical problem that the service life of the bulb tube unit is short in the related art is solved, and the service life of the bulb tube unit is prolonged.
Description
Technical Field
The present invention relates to the field of high voltage generators, and more particularly, to a sparking current suppression method, a sparking current suppression circuit, a control method of the sparking current suppression circuit, a high voltage circuit, a sparking current suppression device, a sparking current suppression apparatus, and a computer-readable storage medium.
Background
The back-end load of a high-voltage generator of an X-ray (X-ray) machine or Computed Tomography (CT) includes a high-voltage bulb unit. The conditions of insulation failure and high-pressure ignition inside the bulb tube unit can occur in the use process of the bulb tube unit. If the high-voltage ignition current is not limited, the energy on the output filter capacitor in the high-voltage generator can be released to the bulb tube unit in a short time, so that the service life of the bulb tube unit is shortened, and the maintenance cost of the equipment is increased.
In order to prolong the service life of the bulb unit, an ignition current suppression circuit is usually connected in series with the high-voltage output end of the high-voltage generator, so as to prevent excessive energy on an output filter capacitor inside the high-voltage generator from being released to the bulb unit side, and further play a role in protecting the bulb unit.
The high-voltage ignition current suppression circuit mainly comprises 2 types, namely a resistance type and an inductance type.
Fig. 1a is a schematic view of a topology of a resistance type sparking current suppression circuit according to the related art, which consumes a sparking current by connecting a resistance in series between a positive output terminal of an output filter capacitor and a bulb unit, as shown in fig. 1 a. In order to reduce the peak value of the sparking current to the range that the bulb unit can bear, considering that a single resistor cannot bear the high voltage at the moment of sparking, a plurality of resistors are required to be connected in series in the actual resistor type sparking current suppression circuit, and generally R is1＝R2＝…＝Rn. On one hand, however, the resistors connected in series can cause the resistance type sparking current suppression circuit to generate a larger voltage drop when the high-voltage generator normally outputs a large current, and a higher requirement is put forward on the gain of the front-end high-voltage generation circuit; on the other hand, the resistance type sparking current suppression circuit can generate great loss under normal working conditions, so that the power density of the high-voltage generator is reduced, and the miniaturization of products is not facilitated.
Fig. 1b is a schematic view of a topology of an inductance type sparking current suppression circuit according to the related art, which has an inductance connected in series between a positive output terminal of an output filter capacitor and a bulb unit, as shown in fig. 1 b. The inductance type sparking current suppression circuit transfers the energy on the output filter capacitor of the high-voltage generator to the inductance in the sparking current suppression circuit during sparking. The inductive sparking current suppression circuit needs to connect reverse diodes in parallel at two ends of an inductor, provide a sparking current follow current path and clamp the voltage on the sparking inductor. When high voltage is ignited, the energy stored in the output filter capacitor C is transferred to the inductor along an arrow path, the current on the loop is gradually increased, and when the energy stored in the output filter capacitor C is completely transferred to the inductor L1To LnIn the upper time, the current in the loop reaches the peak value, and then the current on the inductor follows L1To D1And/or LnTo DnDirection, releasing energy at the resistance R1To RnUpper and D1To DnWherein R is1To RnMay be an inductance L1To LnParasitic resistance of its own, generally L1＝L2＝…＝Ln，R1＝R2＝…＝Rn。
TABLE 1 Peak value of sparking current and duration of sparking current on both sides of bulb unit in sparking current suppression circuit
Table 1 shows the peak values of the sparking currents of the resistance-type sparking current suppression circuit and the inductance-type sparking current suppression circuit, and the duration of the sparking currents on both sides of the bulb unit, respectively, and it can be seen from table 1 that the inductance-type sparking current suppression circuit can suppress the peak values of the sparking currents, but the sparking currents having larger peak values continue for a longer time on the bulb unit, thereby reducing the service life of the bulb unit.
Disclosure of Invention
Based on this, the present invention provides a sparking current suppression method, a sparking current suppression circuit, a control method of the sparking current suppression circuit, a high-voltage circuit, a sparking current suppression device, a sparking current suppression apparatus, and a computer-readable storage medium, for solving the problem of the low service life of the bulb unit in the related art.
In a first aspect, an embodiment of the present invention provides a sparking current suppression circuit, including: a detection unit 10, an inductive energy storage unit 30 and a controllable switching unit 20, wherein,
the detection unit 10 is coupled to the controllable switch unit 20, and the detection unit 10 is configured to detect a sparking current of a high-voltage circuit, and control the controllable switch unit 20 to be turned on when the sparking current is detected;
the inductive energy storage unit 30 is used for being connected in series with the output end of the output filtering unit 50 of the high-voltage circuit;
the input end of the controllable switch unit 20 is connected to one end of the inductive energy storage unit 30, and the other end of the controllable switch unit 20 is connected to the common end.
In some embodiments, the inductive energy storage unit 30 comprises one or more inductive energy storage sub-units connected in series.
In some embodiments, the inductive energy storage unit 30 further comprises one or more resistors connected in series with the inductive energy storage sub-unit.
In some embodiments, the inductive energy storage subunit comprises: an inductor, and/or a circuit consisting of an inductor and a freewheeling diode connected in parallel with the inductor.
In some embodiments, the controllable switching unit 20 comprises at least one of: current mode switching devices, voltage mode switching devices.
In some embodiments, the controllable switching unit 20 comprises a plurality of switching tubes connected in series.
In some embodiments, the controllable switching unit 20 comprises an energized time delay relay.
In some embodiments, the firing current suppression circuit further includes: a control unit, wherein,
the control unit is respectively coupled to the detection unit 10 and the controllable switch unit 20, and the control unit is configured to control the controllable switch unit 20 to be continuously turned on for a preset time according to a control signal sent by the detection unit 10 when the ignition current of the high-voltage circuit is detected.
In a second aspect, an embodiment of the present invention provides a high voltage circuit, including: the rectifier comprises a rectifying unit 60, an output filtering unit 50 and a bulb tube unit 40, wherein the output filtering unit 50 and the bulb tube unit 40 are respectively connected in parallel at the output end of the rectifying unit 60; the high voltage circuit further comprises a sparking current suppression circuit as described in the first aspect.
In a third aspect, an embodiment of the present invention provides a control method for the sparking current suppression circuit in the first aspect, where the control method for the sparking current suppression circuit includes:
receiving a control signal sent by the detection unit 10, wherein the control signal indicates that a spark-over current is detected;
and controlling the controllable switching unit 20 to be continuously conducted for a preset time.
In some embodiments, the preset time period is determined based on the charging and discharging time period of the inductive energy storage unit 30.
In a fourth aspect, an embodiment of the present invention provides a method for suppressing a firing current, including:
detecting the ignition current of a high-voltage circuit, wherein an inductive energy storage unit is connected in series with the output end of the high-voltage circuit;
and under the condition that the sparking current is detected, controlling a circuit branch circuit connected with the output end of the high-voltage circuit and the common end to be conducted so that the sparking current is discharged to the common end through the circuit branch circuit.
In a fifth aspect, an embodiment of the present invention provides a sparking current suppression apparatus, including:
the detection module is used for detecting the sparking current of the high-voltage circuit, wherein an inductive energy storage unit is connected in series with the output end of the high-voltage circuit;
and the control module is used for controlling the conduction of a circuit branch circuit connected with the output end of the high-voltage circuit and the common end under the condition of detecting the ignition current so as to discharge the ignition current to the common end through the circuit branch circuit.
In a sixth aspect, an embodiment of the present invention provides a sparking current suppression apparatus, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the sparking current suppression method of the fourth aspect when executing the computer program.
In a seventh aspect, an embodiment of the present invention provides a computer-readable storage medium, where a computer program is stored, and the computer program, when executed by a processor, implements the sparking current suppression method of the fourth aspect.
By the sparking current suppression method, the sparking current suppression circuit, the control method of the sparking current suppression circuit, the high-voltage circuit, the sparking current suppression device, the sparking current suppression equipment and the computer readable storage medium provided by the embodiment of the invention, the sparking current of the high-voltage circuit is detected, wherein an inductive energy storage unit is connected in series with the output end of the high-voltage circuit; under the condition that the sparking current is detected, the circuit branch circuit which is connected with the output end of the high-voltage circuit and the public end is controlled to be conducted, so that the sparking current is released to the public end through the circuit branch circuit, the technical problem that the service life of the bulb tube unit is short in the related technology is solved, and the service life of the bulb tube unit is prolonged.
The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or technical solutions in related arts, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
FIG. 1a is a schematic of a topology of a resistive sparking current suppression circuit according to the related art;
FIG. 1b is a schematic of a topology of an inductive sparking current suppression circuit according to the related art;
FIG. 2 is a schematic of a topology of a sparking current suppression circuit in accordance with an embodiment of the present invention;
fig. 3 is a topology diagram of an inductive energy storage unit according to an embodiment of the invention;
fig. 4a is a first topology diagram of a high voltage circuit using multi-stage MOS transistors as controllable switch units according to an embodiment of the present invention;
FIG. 4b is a second topology diagram of a high voltage circuit using multi-stage MOS transistors as the controllable switch unit according to the embodiment of the present invention;
FIG. 5 is a schematic of a topology of a high voltage circuit according to an embodiment of the invention;
FIG. 6a is a first topology of a high voltage circuit employing a voltage doubling rectifier circuit as a rectifying unit according to an embodiment of the present invention;
FIG. 6b is a second topology of a high voltage circuit employing a voltage doubling rectifier circuit as a rectifying unit according to an embodiment of the present invention;
FIG. 7 is a flow chart of a control method of the sparking current suppression circuit in accordance with an embodiment of the present invention;
FIG. 8 is a flow chart of a sparking current suppression method in accordance with an embodiment of the present invention;
FIG. 9 is a topology diagram of a high voltage circuit in accordance with a preferred embodiment of the present invention;
FIG. 10 shows a high voltage circuit at t according to a preferred embodiment of the present invention0To t1Working state schematic diagram of the moment;
FIG. 11 is a high voltage circuit at t according to a preferred embodiment of the present invention1To t2Working state schematic diagram of the moment;
FIG. 12 shows a high voltage circuit at t according to a preferred embodiment of the present invention2To t3Working state schematic diagram of the moment;
FIG. 13 is a view at t according to a preferred embodiment of the present invention0To t3Outputting a voltage change schematic diagram at two ends of the filtering unit at any time;
FIG. 14 is a view at t according to a preferred embodiment of the present invention0To t3A schematic diagram of the change of the current flowing through the inductive energy storage unit at any moment;
FIG. 15 is a view at t according to a preferred embodiment of the present invention0To t3The change schematic diagram of the current flowing through the bulb tube unit at any moment;
fig. 16 is a block diagram of the structure of a sparking current suppression apparatus according to an embodiment of the present invention;
fig. 17 is a hardware configuration diagram of a firing current suppressing apparatus according to an embodiment of the present invention.
Reference numerals:
10. a detection unit; 20. a controllable switching unit; 30. an inductive energy storage unit; 40. a bulb unit; 50. an output filtering unit; 60. and a rectifying unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other examples, which can be obtained by a person skilled in the art without making any creative effort based on the examples in the present invention, belong to the protection scope of the present invention.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the present embodiment, a firing current suppression circuit is provided. Fig. 2 is a schematic diagram of a topology of a sparking current suppression circuit in accordance with an embodiment of the present invention, as shown in fig. 2, including: the detection device comprises a detection unit 10, an inductive energy storage unit 30 and a controllable switch unit 20, wherein the detection unit 10 is coupled to the controllable switch unit 20, and the detection unit 10 is used for detecting the sparking current of the high-voltage circuit and controlling the controllable switch unit 20 to be conducted under the condition that the sparking current is detected; the inductive energy storage unit 30 is used for being connected in series with the output end of the output filtering unit 50 of the high-voltage circuit; one end of the controllable switch unit 20 is connected to the output end of the inductive energy storage unit 30, and the other end of the controllable switch unit 20 is connected to the common end.
In the embodiment, when the detection unit 10 detects the sparking current, the controllable switch unit 20 is controlled to be turned on, so that the sparking current is discharged to the common terminal without being discharged to the bulb unit 40, thereby solving the technical problem of short service life of the bulb unit 40 in the related art and prolonging the service life of the bulb unit 40.
It should be noted that the output filter unit 50 includes, but is not limited to, one capacitor or a plurality of capacitors.
In this embodiment, the inductive energy storage unit 30 connected in series to the output end of the output filter unit 50 of the high voltage circuit can also delay the sparking current of the high voltage circuit, so as to avoid the sparking current from being directly released to the bulb unit 40 in a short time, thereby leaving a delay time for the detection unit 10 to detect the sparking current, generate the control signal, and operate the controllable switch unit 20. Based on the same principle, the number of series stages of the inductive energy storage unit 30 can be reduced appropriately to reduce the size of the high-voltage circuit, based on the detection of the ignition current by the detection unit 10, the generation of the control signal, and the delay time of the operation of the controllable switching unit 20.
In addition, when the striking current suppression circuit provided by this embodiment is applied to an X-ray machine or a CT machine, the controllable switch unit 20 can also quickly release the energy stored in the output filter unit 50, so as to increase the falling gradient of the high-voltage pulse generated by the high-voltage generator, reduce the release of soft rays, and thereby reduce the damage of the scanning machine to the human body.
In the above embodiment, the detecting unit 10 may optionally include a diode or a differential operational amplifier, etc. to detect current or voltage, the controllable switch unit 20 may optionally include a switch tube, etc., and the electrical signal detected by the detecting unit 10 may directly drive the controllable switch unit 20 to conduct, i.e., a separate control unit is not necessary.
In some embodiments, the firing current suppression circuit may further include: and a control unit (not shown in the figure) respectively coupled to the detection unit 10 and the controllable switch unit 20, the control unit being configured to control the controllable switch unit 20 to be continuously turned on for a preset time according to a control signal sent by the detection unit 10 when the ignition current of the high-voltage circuit is detected.
In this embodiment, the detecting unit 10 sends a control signal to the control unit when the sparking current exists in the high-voltage circuit, and the control unit controls the controllable switch unit 20 to be continuously turned on for a preset time, so that the sparking current can be ensured to be consumed and not flow through or not substantially flow through the bulb unit.
In other embodiments, the controllable switch unit 20 based on the power-on delay relay may also be adopted, and the power-on delay relay is turned off after being turned on after receiving the control signal and delaying for a preset time, so as to ensure that the firing current is consumed and does not flow through or substantially does not flow through the bulb unit.
It should be noted that the preset time period is determined according to the duration of the sparking current in the high-voltage circuit, and the preset time period is usually not less than the duration of the sparking current. Of course, since the sparking current is gradually decreased with time, the current passing through the bulb will be relatively weak without causing significant damage to the service life of the bulb under the condition that the preset duration is slightly less than the duration of the sparking current.
The inductive energy storage unit 30 of this embodiment may comprise one inductive energy storage subunit, or comprise a plurality of inductive energy storage subunits connected in series. The number of inductive energy storage subunits of the inductive energy storage unit 30 can be determined by the allowable peak value of the sparking current and the duration of the sparking current. Compared with the inductive sparking current suppression circuit shown in fig. 1b in the related art, in the sparking current suppression circuit of the present embodiment, after the controllable switch unit 20 is closed, the branch where the controllable switch unit 20 is located serves as a freewheeling path of the inductive energy storage unit 30 instead of the freewheeling diode connected in parallel to the inductor, so that the diode connected in parallel to the inductor in fig. 1b is omitted, the sparking current suppression circuit is simplified, and the cost is reduced. In addition, because actual inductors are not ideal elements, each inductor has parasitic resistance, and a part of the sparking current can be consumed by the parasitic resistance of the inductor, so that the peak value of the sparking current is reduced.
In the present embodiment described above, the inductive energy storage unit 30 may further comprise one or more resistors. The one or more resistors are connected in series with the inductive energy storage subunit. Preferably, the inductive energy storage sub-units and the resistors are connected in series at intervals, and the inductance value of each inductive energy storage sub-unit is the same, and the resistance value of each resistor is the same. In this embodiment, a resistor is connected in series in the inductive energy storage unit 30 to weaken the ignition current and avoid an excessively high peak value of the ignition current.
The main component of the inductive energy storage subunit in this embodiment is an inductor, which has the advantage of simple structure. In addition, a freewheeling diode can be connected in anti-parallel connection with two ends of the inductor, and the freewheeling diode can prevent voltage and current on the inductor from suddenly changing and provide a current path for the inductor; the inductor provides continuous current for the load by utilizing the freewheeling diode so as to prevent sudden change of the load current and further play a role in smoothing the current.
The parallel direction of the diode depends on the positive high voltage or the negative high voltage of the output voltage, and when the output voltage is the positive high voltage, the diode is connected in anti-parallel with two ends of the inductor, and when the output voltage is the negative high voltage, the diode is connected in parallel with two ends of the inductor.
The inductive energy storage unit 30 will be described and illustrated with reference to the drawings and the preferred embodiments.
Fig. 3 is a topological diagram of an inductive energy storage unit 30 according to an embodiment of the present invention, and as shown in fig. 3, the inductive energy storage unit 30 may be any one of the inductive energy storage units shown in fig. 3 or a combination of a plurality of inductive energy storage sub-units therein.
The controllable switch in this embodiment includes, but is not limited to, a switching tube of at least one of the following: current mode switching devices, voltage mode switching devices. Wherein the current mode switching device comprises one of: a Bipolar Junction Transistor (BJT), a Silicon Controlled Rectifier (SCR), or a gate turn-off silicon controlled rectifier (GTO). The voltage-mode switching device comprises one of the following components: a P-channel metal-oxide semiconductor field effect transistor (P-MOSFET), an Insulated Gate Bipolar Transistor (IGBT), a MOS Controlled Thyristor (MCT), or a Static Induction Transistor (SIT).
Due to the limited voltage endurance of the single switching tube, the controllable switching unit 20 in this embodiment may employ a serial connection of multiple switching tubes in order to avoid breakdown failure of the switching tube. The high voltage circuit as shown in fig. 4a and 4b uses a plurality of MOS transistors connected in series to form the controllable switching unit 20 (the detection unit 10 is not shown in fig. 4). The series connection stage number of the switching tubes is determined based on the output voltage of the high voltage generator and the rated voltage of the switching tubes, so as to ensure that the voltage at two ends of each switching tube does not exceed the rated voltage of the switching tube when the controllable switching unit 20 is switched on. In the case of using a plurality of stages of switching tubes connected in series, each switching tube is turned on or off simultaneously or substantially simultaneously based on the same control signal.
It should be noted that the resistors connected in series in the inductive energy storage unit 30 can also perform a voltage division function, so as to reduce the voltage across the controllable switching unit 20 and across each of the switching tubes, and protect the switching tubes from being broken down by the firing voltage exceeding the rated voltage or from aging.
A high voltage circuit is also provided in the present embodiment. Fig. 5 is a schematic of a topology of a high voltage circuit according to an embodiment of the invention, as shown in fig. 5, the high voltage circuit comprising: the ignition current suppression circuit comprises a rectifying unit 60, an output filtering unit 50, a bulb unit 40 and the ignition current suppression circuit in the embodiment, wherein the output filtering unit 50 and the bulb unit 40 are respectively connected in parallel to the output end of the rectifying unit 60.
In the embodiment, when the detection unit 10 of the sparking current suppression circuit detects the sparking current, the controllable switch unit 20 is controlled to be turned on, so that the sparking current is discharged to the common terminal without being discharged to the bulb unit 40, thereby solving the technical problem of short service life of the bulb unit 40 in the related art and prolonging the service life of the bulb unit 40.
It should be noted that the rectifying unit 60 of the present embodiment includes, but is not limited to, a full-bridge rectifying circuit or other two-voltage and multiple-voltage rectifying circuits, for example, the rectifying unit 60 is a full-bridge rectifying circuit in the high-voltage circuit shown in fig. 4, and two kinds of rectifying units 60 are respectively shown in the high-voltage circuits of fig. 6a and 6b, and both kinds of rectifying units 60 are two-voltage rectifying circuits. Note that the detection unit 10 is not shown in fig. 4, and fig. 6a and 6 b.
The embodiment also provides a control method of the ignition current suppression circuit. Fig. 7 is a flowchart of a control method of the firing current suppression circuit according to the embodiment of the invention, as shown in fig. 7, the flowchart including the steps of:
step S702: the control unit receives a control signal sent by the detection unit 10, wherein the control signal indicates that the ignition current is detected.
Step S704: the control unit controls the controllable switching unit 20 to be continuously turned on for a preset time period.
In this embodiment, the control unit controls the controllable switch unit 20 to be turned on through the detection unit 10 when detecting the sparking current, so that the sparking current is discharged to the common terminal without being discharged to the bulb unit 40, thereby solving the technical problem of short service life of the bulb unit 40 in the related art and prolonging the service life of the bulb unit 40.
The above-mentioned preset time period is determined according to the duration of the ignition current in the high-voltage circuit, and the preset time period is usually not less than the duration of the ignition current. Of course, since the sparking current is gradually decreased with time, the current passing through the bulb will be relatively weak without causing significant damage to the service life of the bulb under the condition that the preset duration is slightly less than the duration of the sparking current.
The embodiment also provides a sparking current suppression method. The method for suppressing the sparking current is applied to a high-voltage circuit, wherein an inductive energy storage unit is connected in series with the output end of the high-voltage circuit, and a branch circuit with controllable on-off is connected between the output end of the high-voltage circuit and a public end. Fig. 8 is a flowchart of a sparking current suppression method according to an embodiment of the present invention, as shown in fig. 8, the flowchart includes the steps of:
step S802: the control unit detects the sparking current of the high-voltage circuit;
step S804: and the control unit controls the conduction of the circuit branch circuit connected with the output end of the high-voltage circuit and the common end under the condition of detecting the ignition current so as to discharge the ignition current to the common end through the circuit branch circuit.
In this embodiment, the control unit controls the circuit branch connecting the output end of the high-voltage circuit and the common end to be conducted when detecting the sparking current, so that the sparking current is discharged to the common end through the circuit branch without being released to the bulb unit 40, thereby solving the technical problem of short service life of the bulb unit 40 in the related art and prolonging the service life of the bulb unit 40.
The preferred embodiments of the present invention will be described and illustrated in conjunction with the accompanying drawings.
In this embodiment, the operation of the high-voltage circuit will be described by taking the inductive energy storage unit 30 as an inductor connected in series in multiple stages and the rectifying unit 60 as a full-bridge rectifying circuit as an example. FIG. 9 is a topology diagram of a high voltage circuit according to a preferred embodiment of the present invention, in which the resistor R in FIG. 91～RnIs an inductance L1～LnThe detection unit 10 is not shown in fig. 9.
The operating state of the high-voltage circuit shown in fig. 9 comprises the following stages:
as shown in fig. 10, 13 to 15, at t0At the moment, the bulb begins to strike fire at t0To t1Stage, the energy on the output filter unit 50 passes through the inductor L1To LnThe current on the inductor rises slowly when the current is released to the bulb unit 40, and the energy on the output filter unit 50 is gradually transferred to the inductor and bulb unit 40.
As shown in fig. 11, 13 to 15, at t1After that moment, the energy on the output filter unit 50 continues to flow to the inductor L1To LnUp-conversion, outputting the voltage V across the filtering unit 500Gradually decreases and the current on the inductor continuously increases. Since the controllable switching unit 20 is at t1Is closed at time, thus at t1-t2Stage, electricity on the bulb unit 40The voltage is clamped by the controllable switching unit 20 and the striking current does not flow through the bulb unit 40.
As shown in fig. 12 to 15, at t2At that moment, the energy on the output filter unit 50 is completely transferred to the inductor L1To LnThe current in the inductor peaks. At t2-t3Stage, current along the inductor L1To LnResistance R1To Rn Controllable switching unit 20 and rectifying diode D of rectifying unit 601To D4Discharging while the voltage across the inductor is rectified by the rectifying diode D of the rectifying unit 601To D4Clamping, inductance L1To LnUpper energy by resistance R1To RnAnd a rectifying diode D of the rectifying unit 601To D4Consumption, inductor current decrease gradually, t3The current on the inductor is reduced to 0 at that moment, and the energy consumption on the inductor is finished.
Wherein, t0Indicates the time, t, at which the bulb unit 40 starts striking a fire1Indicates the moment, t, at which the controllable switching unit 20 starts to close2Represents the time, t, at which the current in the inductor peaks after the controllable switching unit 20 has been closed3Indicating the moment at which the ignition current is consumed to completion, V0Representing the voltage across the capacitor, I1Representing the current across the capacitor, or the output current of the high voltage circuit, I2Representing the current across the bulb unit 40.
It can be seen from the above working process of the sparking current that the high-voltage circuit suppression circuit of the present embodiment not only reduces the peak value of the sparking current on the bulb unit 40, but also shortens the duration of the sparking current of the bulb unit 40 and further reduces the energy released by the output capacitor on the bulb compared with the inductive sparking current suppression circuit in the related art.
The present embodiment further provides an ignition current suppression device, which can be applied to a high-voltage circuit, and is used to implement the above embodiments and preferred embodiments, and the description of the device is omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the system described in the embodiments below is preferably implemented in software, implementations in hardware, or a combination of software and hardware are also possible and contemplated.
Fig. 16 is a block diagram showing the configuration of a sparking current suppression apparatus according to an embodiment of the present invention, as shown in fig. 16, the apparatus including:
the detection module 161 is configured to detect a sparking current of a high-voltage circuit, where an inductive energy storage unit 30 is connected in series to an output end of the high-voltage circuit;
and a control module 162, coupled to the detection module 161, for controlling the circuit branch connecting the output end of the high-voltage circuit and the common terminal to conduct when the sparking current is detected, so that the sparking current is discharged to the common terminal through the circuit branch.
In addition, the sparking current suppression method of the embodiment of the present invention described in conjunction with fig. 8 can be implemented by a sparking current suppression apparatus. Fig. 17 is a hardware configuration diagram of a firing current suppressing apparatus according to an embodiment of the present invention.
The sparking current suppression apparatus may include a processor 171 and a memory 172 having stored thereon computer program instructions.
Specifically, the processor 171 may include a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or may be configured as one or more Integrated circuits implementing an embodiment of the present invention.
The processor 171 realizes any one of the ignition current suppressing methods in the above-described embodiments by reading and executing computer program instructions stored in the memory 172.
In one example, the sparking current suppression apparatus may also include a communication interface 173 and bus 170. As shown in fig. 17, the processor 171, the memory 172, and the communication interface 173 are connected by a bus 170 to complete communication therebetween.
The communication interface 173 is mainly used for implementing communication between modules, apparatuses, units and/or devices in the embodiments of the present invention.
The sparking current suppression apparatus can execute the sparking current suppression method in the embodiment of the present invention based on the detected sparking current of the high-voltage circuit, thereby realizing the sparking current suppression method described in conjunction with fig. 8.
In addition, in combination with the sparking current suppression method in the above embodiments, embodiments of the present invention can be implemented by providing a computer-readable storage medium. The computer readable storage medium having stored thereon computer program instructions; the computer program instructions, when executed by a processor, implement any of the sparking current suppression methods in the above embodiments.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (15)
1. A firing current suppression circuit, comprising: a detection unit (10), an inductive energy storage unit (30) and a controllable switching unit (20), wherein,
the detection unit (10) is coupled to the controllable switch unit (20), the detection unit (10) is used for detecting the ignition current of the high-voltage circuit, and controlling the controllable switch unit (20) to be conducted under the condition that the ignition current is detected;
the inductive energy storage unit (30) is used for being connected in series with the output end of the output filtering unit (50) of the high-voltage circuit;
one end of the controllable switch unit (20) is connected with the output end of the inductive energy storage unit (30), and the other end of the controllable switch unit (20) is connected with a public end.
2. A strike current suppression circuit according to claim 1, wherein the inductive energy storage unit (30) comprises one or more series-connected inductive energy storage sub-units.
3. The strike current suppression circuit according to claim 2, wherein the inductive energy storage unit (30) further comprises one or more resistors connected in series with the inductive energy storage sub-unit.
4. The strike current suppression circuit of claim 2 wherein said inductive energy storage sub-unit comprises: an inductor, and/or a circuit consisting of an inductor and a freewheeling diode connected in parallel with the inductor.
5. A strike current suppression circuit according to claim 1, characterized in that the controllable switching unit (20) comprises at least one of: current mode switching devices, voltage mode switching devices.
6. Sparking current suppression circuit according to claim 1, characterized in that the controllable switching unit (20) comprises a plurality of switching tubes connected in series.
7. A strike current suppression circuit according to claim 1, characterized in that the controllable switch unit (20) comprises a power-on time delay relay.
8. The sparking current suppression circuit of claim 1 further comprising: a control unit, wherein,
the control unit is respectively coupled to the detection unit (10) and the controllable switch unit (20), and the control unit is used for controlling the controllable switch unit (20) to be continuously conducted for a preset time according to a control signal sent by the detection unit (10) under the condition of detecting the ignition current of the high-voltage circuit.
9. A high voltage circuit, the high voltage circuit comprising: the device comprises a rectifying unit (60), an output filtering unit (50) and a bulb tube unit (40), wherein the output filtering unit (50) and the bulb tube unit (40) are respectively connected in parallel to the output end of the rectifying unit (60); it is characterized in that the preparation method is characterized in that,
the high-voltage circuit further comprises a striking current suppression circuit according to any one of claims 1 to 8.
10. A control method of a firing current suppression circuit according to any one of claims 1 to 8, characterized by comprising:
receiving a control signal sent by the detection unit (10), wherein the control signal indicates that a spark-over current is detected;
and controlling the controllable switch unit (20) to be continuously conducted for a preset time.
11. The method of claim 10, wherein the preset time period is determined based on a charge/discharge time period of the inductive energy storage unit (30).
12. A sparking current suppression method, comprising:
detecting the ignition current of a high-voltage circuit, wherein an inductive energy storage unit is connected in series with the output end of the high-voltage circuit;
and under the condition that the sparking current is detected, controlling a circuit branch circuit connected with the output end of the high-voltage circuit and the common end to be conducted so that the sparking current is discharged to the common end through the circuit branch circuit.
13. A sparking current suppression apparatus, comprising:
the detection module is used for detecting the sparking current of the high-voltage circuit, wherein an inductive energy storage unit is connected in series with the output end of the high-voltage circuit;
and the control module is used for controlling the conduction of a circuit branch circuit connected with the output end of the high-voltage circuit and the common end under the condition of detecting the ignition current so as to discharge the ignition current to the common end through the circuit branch circuit.
14. A sparking current suppression apparatus comprising a memory, a processor, and a computer program stored on said memory and executable on said processor, wherein said processor, when executing said computer program, implements a sparking current suppression method as claimed in claim 12.
15. A computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the sparking current suppression method according to claim 12.
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| CN201911213237.7A CN110912390A (en) | 2019-12-02 | 2019-12-02 | Sparking current suppression method, circuit and control method of sparking current suppression circuit |
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| CN201911213237.7A CN110912390A (en) | 2019-12-02 | 2019-12-02 | Sparking current suppression method, circuit and control method of sparking current suppression circuit |
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| CN113063162A (en) * | 2021-04-08 | 2021-07-02 | 安徽汉先智能科技有限公司 | Electronic ignition control system for ball welding type bonding machine |
| US11650242B2 (en) | 2020-07-09 | 2023-05-16 | Shanghai United Imaging Healthcare Co., Ltd. | Devices and methods for arcing detection |
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