CN113625143B - Ultralow frequency cosine square wave generating device and driving method thereof - Google Patents
Ultralow frequency cosine square wave generating device and driving method thereof Download PDFInfo
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- CN113625143B CN113625143B CN202110746789.5A CN202110746789A CN113625143B CN 113625143 B CN113625143 B CN 113625143B CN 202110746789 A CN202110746789 A CN 202110746789A CN 113625143 B CN113625143 B CN 113625143B
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Abstract
The invention relates to an ultralow frequency cosine square wave generating device and a driving method thereof. The ultralow frequency cosine square wave generating device comprises: the high-voltage power supply module is used for outputting positive high voltage and negative high voltage in a time-sharing way; one end of the reactor is connected with the high-voltage power supply module, the other end of the reactor is connected with the cable, and the reactor is used for enabling the cable to generate an ultralow-frequency cosine square wave signal according to the received positive high voltage and negative high voltage; and one end of the control module is connected with a control node between the high-voltage power supply module and the reactor, the other end of the control module is used for being grounded, and the control module is used for overturning the level state of the control node when the high-voltage power supply module does not output positive high voltage and does not output negative high voltage so as to finish the reversing of the positive high voltage or the negative high voltage on the cable. The partial discharge detection of the high-voltage transmission cable is facilitated.
Description
Technical Field
The invention relates to the technical field of detection of insulation states of power transmission cables, in particular to an ultralow frequency cosine square wave generating device and a driving method thereof.
Background
With the continuous promotion of the cabling process in China, the distribution cable is used as an aorta for power grid operation, and the safety and reliability of the distribution cable are closely related to the life of people. Because the cable is buried underground, once the trouble shooting is very difficult and long, the large economic loss is caused, and a plurality of inconveniences are caused to the daily life of residents, the daily production of production departments and the normal operation of other social non-production departments.
Partial discharge is used as the most main expression form of the early stage of the insulation fault of the power cable, is not only the main cause of insulation ageing, but also the main characteristic parameter for representing the insulation condition, so researchers at home and abroad propose a power cable partial discharge detection test with diagnostic function, and the method is a typical method for detecting the latent defect of the power equipment.
A more sophisticated cable insulation status monitoring strategy has been developed for distribution cables of 35kV and below. However, for the high-voltage transmission cable with 110kV and above, the insulation state detection is still in a starting stage, and the development level of insulation state detection equipment for related voltage levels at home and abroad is also greatly insufficient.
Disclosure of Invention
Based on this, it is necessary to provide an ultralow frequency cosine square wave generating device suitable for partial discharge detection of a high-voltage transmission cable and a driving method thereof.
An ultralow frequency cosine square wave generating device, comprising:
the high-voltage power supply module is used for outputting positive high-voltage and negative high-voltage in a time-sharing manner;
one end of the reactor is connected with the high-voltage power supply module, the other end of the reactor is connected with the cable, and the reactor is used for generating an ultralow-frequency cosine square wave signal on the cable according to the received positive high voltage and negative high voltage;
and one end of the control module is connected with a control node between the high-voltage power supply module and the reactor, the other end of the control module is used for being grounded, and the control module is used for overturning the level state of the control node when the high-voltage power supply module does not output positive high voltage and does not output negative high voltage so as to finish reversing of the positive high voltage and the negative high voltage on the cable.
In one embodiment, a control module includes:
one end of the first high-voltage semiconductor switch is connected with the control node, the other end of the first high-voltage semiconductor switch is connected with the grounding end, and the first high-voltage semiconductor switch is used for controlling the current path of the control node in the direction of the grounding end to be conducted so as to control the control node to turn from a negative level state to a positive level state;
and one end of the second high-voltage semiconductor switch is connected with the control node, the other end of the second high-voltage semiconductor switch is used for connecting the grounding end, and the second high-voltage semiconductor switch is used for controlling the conduction of a current path of the grounding end flowing to the direction of the control node so as to control the control node to turn over from a positive level state to a negative level state.
In one embodiment, a first high voltage semiconductor switch includes:
the n first transistors are connected in series, the collector electrodes of the first transistors are used for being grounded, the collector electrodes of the m first transistors are connected with the emitter electrodes of the m-1 first transistors, the emitter electrodes of the n first transistors are connected with the control node, wherein m is more than 1 and less than or equal to n, m and n are positive integers, the gate electrodes of the first transistors are respectively used for receiving first control signals, and the first control signals are respectively used for controlling the on-off of the first transistors.
In one embodiment, the second high voltage semiconductor switch comprises:
the p second transistors are connected in series, the collector electrode of the first second transistor is connected with the control node, the collector electrode of the q second transistor is connected with the emitter electrode of the m-1 second transistor, the emitter electrode of the p second transistor is used for grounding, wherein q is more than 1 and less than or equal to p, q and p are positive integers, the gate electrodes of the second transistors are respectively used for receiving second control signals, and the second control signals are respectively used for controlling the on-off of the second transistors.
In one embodiment, the maximum withstand voltage of each first transistor and each second transistor is the same.
In one embodiment, a high voltage power supply module includes:
the direct-current power supply is configured with a first output end and a second output end, wherein the first output end is used for outputting positive high voltage, and the second output end is used for outputting negative high voltage;
the high-voltage relay unit is configured with a first input end, a second input end and a high-voltage output end, the first input end of the high-voltage relay unit is connected with the first output end of the direct-current power supply, the second input end of the high-voltage relay unit is connected with the second output end of the direct-current power supply, the output end of the high-voltage relay unit is connected with the reactor, and the high-voltage relay unit is used for controlling the positive high-voltage output path and the negative high-voltage output path to conduct in a time-sharing mode.
In one embodiment, the high-voltage relay unit includes two high-voltage relay subunits, the input ends of the high-voltage relay subunits are respectively connected with the output ends of the direct-current power supply in a one-to-one correspondence manner, the output ends of the high-voltage relay subunits are connected as nodes to serve as the output ends of the high-voltage relay unit, and the high-voltage relay subunits include:
the input end of the first relay circuit is connected with one input end of the high-voltage power supply module, the input end of the b relay circuit is connected with the output end of the b-1 relay circuit, the output end of the a relay circuit is connected with the reactor, wherein b is more than 1 and less than or equal to a, and a and b are positive integers.
In one embodiment, the maximum withstand voltages of the plurality of relay circuits are the same.
In one embodiment, the winding of the reactor is in the form of a bottom-up kink.
A driving method for driving an ultralow frequency cosine square wave generating device, which is used for driving the ultralow frequency cosine square wave generating device, comprising the following steps:
outputting positive high voltage and negative high voltage in a time-sharing way;
when positive high voltage is not output and negative high voltage is not output, the level state of a control node of the ultralow frequency cosine square wave generating device is turned over to finish the reversing of the positive high voltage and the negative high voltage on the cable;
and outputting an ultralow-frequency cosine square wave signal to the cable according to the received positive high voltage and negative high voltage.
The ultralow frequency cosine square wave generating device comprises a high-voltage power supply module, a power supply module and a power supply module, wherein the high-voltage power supply module is used for outputting positive high voltage and negative high voltage in a time-sharing way; one end of the reactor is connected with the high-voltage power supply module, the other end of the reactor is connected with the cable, and the reactor is used for outputting an ultralow-frequency cosine square wave signal to the cable according to the received positive high voltage and negative high voltage; and one end of the control module is connected with a control node between the high-voltage power supply module and the reactor, the other end of the control module is used for being grounded, and the control module is used for overturning the level state of the control node when the high-voltage power supply module does not output positive high voltage and does not output negative high voltage so as to finish the steering of outputting positive high voltage and negative high voltage to the cable. When the high-voltage power supply module outputs the reverse voltage, the high-voltage power supply module charges the cable reversely, and after the reverse charging, the control module again completes the turning, so that the ultralow-frequency cosine square wave is continuously repeated, and the partial discharge detection of the cable is completed in the reversing process.
Drawings
In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings required for the descriptions of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of an ultralow frequency cosine square wave generator according to an embodiment;
FIG. 2 is a circuit diagram of a control module according to an embodiment;
FIG. 3 is a circuit diagram of a high voltage power supply module according to an embodiment;
FIG. 4 is a circuit diagram of a high voltage relay subunit of an embodiment;
FIG. 5 is a circuit diagram of an ultralow frequency cosine square wave generator according to an embodiment;
fig. 6 is a flowchart of a driving method of an ultralow frequency cosine square wave generating device according to an embodiment.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that the terms "first," "second," and the like, as used herein, may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, a first transistor may be referred to as a second transistor, and similarly, a second transistor may be referred to as a first transistor, without departing from the scope of the present application. The first transistor and the second transistor are both transistors, but they are not the same transistor.
It is to be understood that in the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.
In the description of the present specification, reference to the terms "some embodiments," "other embodiments," "desired embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
As shown in fig. 1, a schematic diagram of an ultralow frequency cosine square wave generating device is provided, and the ultralow frequency cosine square wave generating device 100 includes a high-voltage power supply module 110, a reactor 130 and a control module 150. The high-voltage power supply module 110 is used for outputting positive high voltage and negative high voltage in a time-sharing manner; one end of the reactor 130 is connected with the high-voltage power supply module, the other end of the reactor 130 is connected with a cable, and the reactor 130 is used for enabling the cable to generate an ultralow-frequency cosine square wave signal according to the received positive high voltage and negative high voltage; one end of the control module 150 is connected with a control node between the high-voltage power supply module and the reactor, the other end of the control module 150 is used for being grounded, and the control module 150 is used for overturning the level state of the control node when the high-voltage power supply module does not output positive high voltage and does not output negative high voltage so as to finish the steering of outputting positive high voltage or negative high voltage to the cable.
Wherein the inversion of the level state of the control node refers to the state at the control node transitioning from a high level to a low level or from a low level to a high level.
In this embodiment, through the output of the high-voltage power module 110 for a certain period of time, the positive high-voltage path and the negative high-voltage path are respectively conducted in the circuit connected with the reactor 130 and the cable, and the positive voltage and the negative voltage in the circuit are commutated by the control module 150, and the level state of the control node connected between the high-voltage power module and the reactor is turned over, so that the voltage on the cable can generate positive and negative commutation, and the ultra-low frequency cosine square wave signal is obtained by controlling the output time of the positive and negative high voltages.
In one embodiment, as shown in FIG. 2, a circuit diagram of a control module is provided. The control module 150 includes a first high voltage semiconductor switch 151 and a second high voltage semiconductor module 153. One end of the first high-voltage semiconductor switch 151 is connected with a control node between the high-voltage power supply module and the reactor, the other end of the first high-voltage semiconductor switch 151 is used for connecting a grounding end, and the first high-voltage semiconductor switch 151 is used for controlling a current path of the control node in the direction of the grounding end to be conducted so as to control the control node to be turned over from a negative level state to a positive level state; one end of the second high-voltage semiconductor module 153 is connected with a control node between the high-voltage power supply module and the reactor, the other end of the second high-voltage semiconductor module 153 is used for connecting a grounding end, and the second high-voltage semiconductor module 153 is used for controlling a current path of the grounding end flowing to the direction of the control node to be conducted so as to control the control node to be turned over from a positive level state to a negative level state.
In this embodiment, the control module 150 is configured to reverse positive and negative voltages in the circuit through a line connection relationship that one end of the first high-voltage semiconductor switch 151 and one end of the second semiconductor switch 153 are connected to a ground terminal when no voltage is output from the high-voltage power module to the circuit, so that series resonance is generated between the reactor 130 and the cable, and the series resonance can be used for partial discharge detection.
In one embodiment, with continued reference to fig. 2, the first semiconductor switch 151 includes n first transistors T1 connected in series, where the collector of the first transistor T1 is used for grounding, the collector of the mth first transistor T1 is connected to the emitter of the mth-1 first transistor T1, the emitter of the nth first transistor T1 is connected to the control node, where 1 < m n, where m and n are positive integers, the gates of the first transistors T1 are respectively used for receiving first control signals, and the first control signals are respectively used for controlling the on/off of the first transistors T1. Specifically, in the embodiment of fig. 2, two first transistors T1 are included.
In this embodiment, the series connection of the plurality of first transistors may reduce the requirement for the withstand voltage limit of a single transistor in the high voltage circuit.
In one embodiment, with continued reference to fig. 2, the second semiconductor switch 153 includes p second transistors T2 connected in series, a collector of the first second transistor T2 is connected to a control node, a collector of the q-th second transistor T2 is connected to an emitter of the m-1 th second transistor T2, the emitter of the p-th second transistor T2 is used for grounding, where q is greater than or equal to 1 and less than p, q and p are both positive integers, gates of the second transistors T2 are respectively used for receiving second control signals, and the second control signals are respectively used for controlling on-off of the second transistors T2. Specifically, in the embodiment of fig. 2, two second transistors T2 are included.
In this embodiment, the series connection of the plurality of second transistors may reduce the requirement for the withstand voltage limit of a single transistor in the high voltage circuit.
In one embodiment, the maximum withstand voltage of each of the first transistors T1 and each of the second transistors T2 is the same.
In one embodiment, the first semiconductor switch and the second semiconductor switch further include a first control signal module and a second control signal module, respectively, configured to output a first control signal and a second control signal, where the first control signal and the second control signal are transmitted through an optical fiber, so as to control on-off of each of the first transistor and the second transistor, respectively.
In one embodiment, the first semiconductor switch and the second semiconductor switch respectively include 24 photo-triggered transistors connected in series, and the maximum withstand voltage of each photo-triggered transistor is 7.5kV and the maximum operating current is 200A.
In one embodiment, to ensure that the local electric field is not too large, the two ends of each optical triggering transistor further comprise equalizing rings, which are used for making certain equalizing voltages at the two ends of each stage of transistor.
In one embodiment, as shown in fig. 3, a high voltage power supply module circuit diagram is provided. The high voltage power supply module 110 includes a direct current power supply 111 and a high voltage relay 113. The dc power supply 111 is configured with a first output terminal for outputting a positive high voltage and a second output terminal for outputting a negative high voltage; the high-voltage relay unit 113 is configured with a first input terminal, a second input terminal, and a high-voltage output terminal, the first input terminal of the high-voltage relay unit 113 is connected to the first output terminal of the dc power supply, the second input terminal of the high-voltage relay unit 113 is connected to the second output terminal of the dc power supply 111, the output terminal of the high-voltage relay unit 113 is connected to the reactor 130, and the high-voltage relay unit 113 is used for controlling the positive high-voltage output path and the negative high-voltage output path to conduct in a time-sharing manner.
In this embodiment, the high-voltage power supply module 110 can isolate the high-voltage dc power supply 111 from the circuit connected to the subsequent stage through the high-voltage relay unit 113 connected to the dc power supply 111, so as to ensure time-sharing output of the positive high voltage and the negative high voltage of the dc power supply 111.
In one embodiment, with continued reference to fig. 3, the high voltage relay 113 unit includes two high voltage relay subunits, one of which is connected in series with the input of resistor R1 and the other of which is connected in series with the input of resistor R2. The input ends of the high-voltage relay subunits are connected with the output ends of the direct current power supplies respectively in one-to-one correspondence, and the output end connection nodes of the resistors R1 and R2 connected to the high-voltage relay subunits serve as the output ends of the whole high-voltage relay units. As shown in fig. 4, a circuit diagram of a high-voltage relay subunit is provided. The high-voltage relay subunit comprises a relay circuits 113A which are connected in series, wherein the input end of a first relay circuit is connected with one input end of a high-voltage power supply module, the input end of a b relay circuit is connected with the output end of a (b-1) relay circuit, the output end of the a relay circuit is connected with a reactor, b is more than 1 and less than or equal to a, and a and b are positive integers. Specifically, the embodiment of fig. 4 includes two relay circuits.
In this embodiment, since the positive high voltage and the negative high voltage in the circuit cannot be timely released in the process of reversing, for example, in the process of reversing from 180kV positive high voltage to negative high voltage, the front end of the first high voltage relay subunit connected to the positive high voltage output end of the direct current power supply outputs the positive high voltage, the 180kV residual charge connected to the direct current power supply end is not released, the output voltage is still kept about 180kV in a short time, and the voltage of the cable at the rear end can finish reversing to-180 kV in a period of up to 20ms, and at the moment, the voltage difference between the voltages at the two ends of the first high voltage relay subunit is up to 360kV. Therefore, the invention adopts a plurality of relay circuits to be connected in series, can realize the effect of high voltage resistance, further plays the role of isolating the direct current power supply from a post-stage circuit, and achieves the purpose of protecting the direct current power supply.
In one embodiment, the maximum withstand voltage of the relay circuit is the same.
In one embodiment, the high-voltage relay subunit comprises 6 relay circuits, the withstand voltage value of each relay circuit is 70kV, and the maximum on-current is 10A. In the embodiment, 6 relay circuits with withstand voltage of 70kV can ensure that the high-voltage relay subunit can bear the highest 420kV voltage difference, so that the purpose of protecting a direct-current power supply is achieved.
In one embodiment, with continued reference to FIG. 4, a relay switch 113A is included in the relay circuit 113A 1 Voltage equalizing circuit 113A 2 Drive circuit 113A 3 And a driving power supply 113A 4 。
Specifically, the driving circuit 113A 3 Comprising a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), a Metal-Oxide-field-effect transistor driving circuit and a photodiode D 0 . The voltage equalizing circuit comprises voltage equalizing capacitors C connected in parallel 0 And equalizing resistor R 0 . Wherein, the equalizing capacitor C 0 The capacitance value of (1 nF) is used for dynamic voltage equalizing and equalizing resistance R 0 The resistance value of (2) is 10MΩ, and is used for static equalizing.
The positive electrode and the negative electrode of the driving power supply are connected to the metal oxide semiconductor field effect transistor driving circuit and are used for supplying power to the metal oxide semiconductor field effect transistor driving circuit; the metal oxide semiconductor field effect transistor driving circuit is connected with the gate electrode and the emitter electrode of the metal oxide semiconductor field effect transistor and is used for driving the metal oxide semiconductor field effect transistor; the photodiode is connected to the MOSFET driving circuit and is used for switching on and off the MOSFET by using an optical signal; the collector of the metal oxide semiconductor field effect transistor is connected with one end of the relay switch and used for switching on and off the relay; the other end of the relay switch is connected with the positive electrode of the driving power supply; the two ends of the voltage equalizing circuit are respectively connected with the two ends of the relay switch in parallel, and parallel nodes at the two ends of the voltage equalizing circuit and the relay switch are respectively used as an input end and an output end of the relay circuit.
The driving power supply can be a battery, and the driving circuit can continuously work for not less than 5 hours after one-time charging is completed according to design standards.
In one embodiment, as shown in fig. 5, an ultra low frequency cosine square wave generator circuit diagram is provided, and a direct current power supply 111 comprises a positive high voltage power supply HVDC-a and a negative high voltage power supply HVDC-b. The forward high-voltage power supply HVDC-a is used for forward charging of the cable, the highest output direct-current voltage is +180kV, and the maximum output power is 4kV. The negative high-voltage power supply HVDC-b is used for reversely charging the cable, the highest output direct-current voltage is-180 kV, the maximum output power is 4kV, and the charging current exceeds 20mA under the peak voltage.
In one embodiment, the positive high-voltage power supply and the negative high-voltage power supply of the direct-current power supply are further connected with an output voltage control port and a switch enabling port. The output voltage control port linearly controls the high voltage output of 0kV to +180kV or-180 kV to 0kV through a low voltage signal of 0-5V; the switch enabling port controls the switching of the positive and negative high-voltage power supply through the change of the high-low level, and when the positive and negative high-voltage power supply is turned off, all the switching-based devices in the device are turned off.
According to the embodiment, the output voltage value of the direct-current power supply can be regulated and controlled through the output voltage control port and the switch enabling port, and meanwhile the safety of the whole device is guaranteed.
In one embodiment, the winding form of the axis of the reactor is a bottom-up winding form, which is different from the winding form from inside to outside adopted in the conventional method, so that the longitudinal voltage of the reactor can be balanced as much as possible. Wherein, the reactor parameter is withstand voltage 180kV, inductance value 6H, resistance value 90Ω, and the weight of reactor is about 110kg, and the size of single reactor is about 600mm x 800mm.
In one embodiment, the ultralow frequency cosine square wave generating device further comprises a high-voltage relay support column for supporting the high-voltage relay switch. Because the whole switch of the high-voltage relay switch is in a high-voltage state for a long time in the working process, the high-voltage relay switch needs to be supported, and the high-voltage relay switch is supported for a distance of about 1.5 meters, so that the ground breakdown and the surface flashover are prevented.
In one embodiment, a driving method of an ultralow frequency cosine square wave generating device is provided, which is used for driving the ultralow frequency cosine square wave generating device, and referring to fig. 6, the driving method includes steps S100-S300.
Step S100, outputting positive high voltage and negative high voltage in a time-sharing way.
Wherein the whole output voltage process in one cycle comprises four phases. First stageTo output positive high-voltage phases 0-t with a certain duration 1 The method comprises the steps of carrying out a first treatment on the surface of the The second stage is a stage t of not outputting positive high voltage and not outputting negative high voltage 1 ～t 2 The method comprises the steps of carrying out a first treatment on the surface of the The third stage is a negative high-voltage stage t outputting a certain time period 2 ～t 3 The method comprises the steps of carrying out a first treatment on the surface of the The fourth stage is a stage t in which positive high voltage is not output and negative high voltage is not output 3 ～t 4 。
Specifically, the four phase durations within a cycle are equal, all 5s.
And step 200, when positive high voltage is not output and negative high voltage is not output, the level state of the control node of the ultralow frequency cosine square wave generating device is turned over to finish the reversing of the positive high voltage or the negative high voltage on the cable.
Wherein in the first stage 0 to t 1 At this time, the output positive high voltage is used to positively charge the cable, while in the second phase t 1 ～t 2 When the discharge of the cable is controlled, the positive high-voltage reversing on the cable is completed to negative high voltage, and the state of the level of the control node in the ultralow frequency cosine square wave generating device is overturned, and the high level is overturned to the low level; similarly, in the third stage t 2 ～t 3 The negative high voltage output is used to charge the cable in reverse during the fourth phase t 3 ～t 4 And when the discharge of the cable is controlled, the negative high-voltage reversing on the cable is completed to positive high voltage, and the state of the level of the control node in the ultralow frequency cosine square wave generating device is overturned, and the low level is overturned to the high level.
And step S300, according to the received positive high voltage and negative high voltage, generating an ultralow frequency cosine square wave signal on the cable.
The cable generates an ultralow-frequency cosine square wave signal with one period through forward charging, reverse reversing, reverse charging and forward reversing of the cable.
In this embodiment, the ultralow frequency cosine square wave generating device may be continuously cycled from the first stage to the fourth stage to generate cosine square waves with multiple periods. Because the maintaining time of each stage is 5s, the whole cosine square wave presents an ultralow frequency state, and the reversing process of the second stage is longer than the time in the traditional technology, thereby being beneficial to the detection of partial discharge of the cable, namely the cable.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (7)
1. An ultralow frequency cosine square wave generating device, comprising:
the high-voltage power supply module is used for outputting positive high voltage and negative high voltage in a time-sharing way;
one end of the reactor is connected with the high-voltage power supply module, the other end of the reactor is connected with a cable, and the reactor is used for generating an ultralow-frequency cosine square wave signal on the cable according to the received positive high voltage and negative high voltage;
one end of the control module is connected with a control node between the high-voltage power supply module and the reactor, the other end of the control module is used for being grounded, and the control module is used for overturning the level state of the control node when the high-voltage power supply module does not output positive high voltage and does not output negative high voltage so as to finish reversing of the positive high voltage and the negative high voltage on the cable; the control module includes:
one end of the first high-voltage semiconductor switch is connected with the control node, the other end of the first high-voltage semiconductor switch is used for connecting with a grounding end, and the first high-voltage semiconductor switch is used for controlling the current path of the control node in the direction of flowing to the grounding end to be conducted so as to control the control node to be turned over from a negative level state to a positive level state; the first high voltage semiconductor switch includes:
the n first transistors are connected in series, the collector of the first transistor is used for being grounded, the collector of the mth first transistor is connected with the emitting electrode of the mth-1 first transistor, the emitting electrode of the nth first transistor is connected with the control node, wherein m is more than 1 and less than or equal to n, m and n are positive integers, the gate electrodes of the first transistors are respectively used for receiving first control signals, and the first control signals are respectively used for controlling the on-off of the first transistors;
the high voltage power supply module includes: the direct-current power supply is configured with a first output end and a second output end, wherein the first output end is used for outputting the positive high voltage, and the second output end is used for outputting the negative high voltage;
the high-voltage relay unit is configured with a first input end, a second input end and a high-voltage output end, the first input end of the high-voltage relay unit is connected with the first output end of the direct-current power supply, the second input end of the high-voltage relay unit is connected with the second output end of the direct-current power supply, the output end of the high-voltage relay unit is connected with the reactor, and the high-voltage relay unit is used for controlling the positive high-voltage output path and the negative high-voltage output path to conduct in a time-sharing mode;
the high-voltage relay unit comprises two high-voltage relay subunits, the input end of each high-voltage relay subunit is respectively connected with each output end of the direct-current power supply in a one-to-one correspondence manner, the output end connecting node of each high-voltage relay subunit is used as the output end of the high-voltage relay unit, and the high-voltage relay subunit comprises:
a series-connected relay circuits, wherein the input end of the first relay circuit is connected with the output end of the high-voltage power supply module, the input end of the b-th relay circuit is connected with the output end of the b-1-th relay circuit, the output end of the a-th relay circuit is connected with the reactor, wherein b is more than 1 and less than or equal to a, and both a and b are positive integers.
2. The apparatus of claim 1, wherein the control module further comprises:
and one end of the second high-voltage semiconductor switch is connected with the control node, the other end of the second high-voltage semiconductor switch is used for connecting with a grounding end, and the second high-voltage semiconductor switch is used for controlling the current path of the grounding end flowing to the direction of the control node to be conducted so as to control the control node to be turned over from a positive level state to a negative level state.
3. The apparatus of claim 2, wherein the second high voltage semiconductor switch comprises:
and p second transistors connected in series, wherein the collector electrode of the first second transistor is connected with the control node, the collector electrode of the q-1 th second transistor is connected with the emitter electrode of the q-1 th second transistor, the emitter electrode of the p-th second transistor is used for being grounded, q is more than 1 and less than or equal to p, q and p are positive integers, the gate electrodes of the second transistors are respectively used for receiving second control signals, and the second control signals are respectively used for controlling the on-off of the second transistors.
4. The apparatus of claim 3, wherein a maximum withstand voltage of each of the first transistors and each of the second transistors is the same.
5. The apparatus of claim 1, wherein the maximum withstand voltages of the plurality of relay circuits are the same.
6. The apparatus of claim 1, wherein the reactor is wound in a bottom-up twist.
7. A driving method of an ultralow frequency cosine square wave generating device, characterized by being used for driving the ultralow frequency cosine square wave generating device according to any one of claims 1-6, comprising:
outputting positive high voltage and negative high voltage in a time-sharing way;
when the positive high voltage is not output and the negative high voltage is not output, the level state of the control node of the ultralow frequency cosine square wave generating device is turned over to finish the reversing of the positive high voltage and the negative high voltage on the cable;
and outputting an ultralow-frequency cosine square wave signal to the cable according to the received positive high voltage and negative high voltage.
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