CN112713797B - Cascaded regulation nanosecond pulse power supply based on double avalanche triodes and control method thereof - Google Patents
Cascaded regulation nanosecond pulse power supply based on double avalanche triodes and control method thereof Download PDFInfo
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- CN112713797B CN112713797B CN202011398946.XA CN202011398946A CN112713797B CN 112713797 B CN112713797 B CN 112713797B CN 202011398946 A CN202011398946 A CN 202011398946A CN 112713797 B CN112713797 B CN 112713797B
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- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
- H03K3/57—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback the switching device being a semiconductor device
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Abstract
The application provides a cascade regulation nanosecond pulse power supply based on a double avalanche triode and a control method thereof, relates to the technical field of micro special processing, and comprises the following steps: the circuit structure that the small-capacity capacitor for regulating the pulse width and the large-capacity capacitor for providing discharge energy are separated is adopted, pulse tailing is avoided by utilizing the active turn-off function of the avalanche transistor, the small-capacity capacitor can regulate and control the output pulse width, the large-capacity capacitor can regulate and control the discharge voltage, and the purpose of independently regulating and controlling the output pulse width and the pulse voltage is achieved. The cascade regulation nanosecond pulse power supply can output nanosecond monopulse and high-frequency continuous pulse with adjustable pulse width and adjustable pulse voltage.
Description
Technical Field
The application relates to the technical field of micro special processing, in particular to a cascade regulation nanosecond pulse power supply based on a double avalanche triode and a control method thereof.
Background
Generally, a pulse power source affects various aspects such as micro electric discharge machining efficiency, machining accuracy, stability, and tool electrode wear. The single-pulse discharge erosion removal amount of the electric discharge machining is mainly determined by a pulse discharge power supply, and the narrower the single-pulse discharge pulse width is, the smaller the discharge energy is, the higher the machining precision is expected to be, and the smaller the electrode loss is expected to be. Therefore, the pulse discharge power supply with ultra-narrow nanosecond pulse width is one of effective technical approaches for improving the effect of the electric spark machining process.
At present, commonly used pulse power supplies can be divided into an RC (resistance-capacitance) type and a transistor type, the RC type pulse power supply adopts a capacitor as an energy storage element to discharge a load, and the transistor type pulse power supply directly adopts a direct current power supply to discharge the load. At present, the two pulse power supplies mostly adopt elements such as a metal oxide semiconductor field effect (MOS) transistor and the like as a switching tube for controlling discharge, and a micro-system modulation pulse such as a single chip microcomputer, a Field Programmable Gate Array (FPGA) and the like is often used as a control pulse of the switching tube. Therefore, for realizing nanosecond narrow pulse width pulse, the requirement on the pulse output frequency of the microsystem is high (up to hundreds of megahertz), and the conduction speed of the switching element of the MOS transistor is required to reach tens of nanoseconds. Therefore, the pulse power supply based on the principle of controlling the pulse regulation switching tube is difficult to output pulse width reaching nanosecond level and output single nanosecond narrow pulse width.
The narrow pulse width pulse power supply which has the pulse width and the pulse voltage which can be independently adjusted and has the magnitude of several nanoseconds is also lacked for the micro electric discharge machining of which the discharge pulse energy can be accurately controlled.
Disclosure of Invention
The present application is directed to solving, at least in part, one of the technical problems in the related art.
Therefore, the first purpose of the application is to provide a double avalanche transistor-based cascade regulation nanosecond pulse power supply, and the nanosecond pulse power supply has the advantages of low cost, good stability, small volume, compact structure and easiness in integration in micro electric spark machining equipment.
The second purpose of the present application is to provide a control method for regulating and controlling a nanosecond pulse power supply based on a cascade of double avalanche triodes.
In order to achieve the above object, a first embodiment of the present application provides a cascaded regulated nanosecond pulse power supply based on a dual avalanche transistor, including:
little electric capacity charge circuit (1), little electric capacity discharge circuit (2), drive pulse input circuit (3), big electric capacity charge circuit (4) and big electric capacity discharge circuit (5), little electric capacity charge circuit (1) includes: the direct current power supply (E1), the first current limiting resistor (R1), the small-capacity energy storage capacitor (C1) and the diode (D1); the small-capacitance discharge circuit (2) comprises: the low-capacity energy storage capacitor (C1), the triode (T1) and the load resistor (R4); the drive pulse input circuit (3) includes: an external pulse source (V1), a second current limiting resistor (R2) and a third current limiting resistor (R3); the large-capacitance charging circuit (4) comprises: a direct current power supply (E2), a fourth current limiting resistor (R5) and a large-capacity capacitor (C2); the large capacitance discharge circuit (5) comprises: the high-capacity capacitor (C2), the triode (T2), the fifth current-limiting resistor (R6) and the positive and negative output ports;
wherein the positive electrode of the direct current power supply (E1) is electrically connected with the first current-limiting resistor (R1), the other end of the first current-limiting resistor (R1) is electrically connected with the small-capacity energy-storing capacitor (C1), the other end of the small-capacity energy-storing capacitor (C1) is electrically connected with the positive electrode of the diode (D1), and the negative electrode of the diode (D1) is electrically connected with the negative electrode of the direct current power supply (E1) to form the small-capacity charging circuit (1);
the small-capacity energy storage capacitor (C1) is electrically connected with the collector of the triode (T1), the emitter of the triode (T1) is electrically connected with the load resistor (R4), and the other end of the load resistor (R4) is electrically connected with the other end of the capacitor to form the small-capacity discharge circuit (2);
in the driving pulse input circuit, the positive output end of the external pulse source (V1) is electrically connected with the second current-limiting resistor (R2) and the third current-limiting resistor (R3), the other end of the second current-limiting resistor (R2) is electrically connected with the base of the triode (T1), the other end of the third current-limiting resistor (R3) is electrically connected with the negative output end of the external pulse source (V1), and the negative output end of the external pulse source (V1) is electrically connected with the emitter of the triode (T1) to form the driving pulse input circuit (3);
the positive electrode of the direct current power supply (E2) is electrically connected with the fourth current-limiting resistor (R5), the other end of the fourth current-limiting resistor (R5) is electrically connected with the large-capacity capacitor (C2), and the other end of the large-capacity capacitor (C2) is electrically connected with the negative electrode of the direct current power supply (E2) to form the large-capacity charging loop (4);
the high-capacity capacitor (C2) is electrically connected with the collector of the triode (T2), the base and the emitter of the triode (T2) are respectively connected with the two ends of the load resistor (R4) in the small-capacity discharge circuit (2) for controlling pulse width, the emitter of the triode (T2) is electrically connected with the fifth current-limiting resistor (R6), the other end of the fifth current-limiting resistor (R6) is electrically connected with the positive output port, and the negative output port is electrically connected with the other end of the high-capacity capacitor (C2) to form the high-capacity discharge circuit (5).
In order to achieve the above object, a second embodiment of the present application provides a control method for a cascade control nanosecond pulse power supply based on a dual avalanche transistor, including:
when the driving pulse input circuit inputs a pulse signal, the triode in the small capacitor discharge circuit is conducted, nanosecond narrow pulse width pulse is generated on the load resistor, the triode in the large capacitor discharge circuit is conducted for a short time through the nanosecond narrow pulse width pulse, the large capacitor discharge circuit is controlled to work, and the nanosecond pulse width pulse is output at the output end of the circuit.
In an embodiment of the application, when the driving pulse input circuit inputs a pulse signal, the transistor in the small capacitor discharge circuit is turned on, and a nanosecond narrow pulse width pulse is generated on the load resistor, the nanosecond narrow pulse width pulse makes the transistor in the large capacitor discharge circuit turned on for a short time, so as to control the large capacitor discharge circuit to operate, and the nanosecond pulse width pulse is output at the circuit output end, including:
controlling the direct current power supply to be turned on;
connecting a tool electrode and a workpiece to the output end of the high-capacity capacitor discharge loop;
controlling an external pulse source to be opened, and setting the type of a driving signal;
inputting a drive pulse signal, wherein said nanosecond narrow pulse width pulses are generated singly or continuously between said tool electrode and said workpiece in accordance with said type of drive signal.
In an embodiment of the present application, the small-capacity energy storage capacitor and the large-capacity capacitor in the small-capacity discharge circuit and the large-capacity discharge circuit are respectively used for regulating and controlling a discharge pulse width and a pulse voltage, wherein the two are separately regulated and controlled.
In an embodiment of the present application, according to the capacity of the small-capacity energy storage capacitor in the small-capacity charging circuit, the electric pulse generated on the load resistor is a nanosecond pulse width, so that the pulse width of the output pulse of the large-capacity capacitor discharging circuit is regulated and controlled to be nanosecond.
In one embodiment of the present application, the voltage across the two terminals during the discharging process is at a first specific value according to the capacity of the large-capacity capacitor in the large-capacity discharging loop, so that the pulse voltage of the output pulse is kept at a second specific value.
In order to achieve the above object, a control device for regulating nanosecond pulse power supply based on cascade of dual avalanche transistors is provided in an embodiment of the third aspect of the present application, including:
and the processing module is used for conducting the triode in the small capacitor discharging loop when the driving pulse input circuit inputs a pulse signal and generating a nanosecond narrow pulse width pulse on the load resistor, wherein the nanosecond narrow pulse width pulse enables the triode in the large capacitor discharging loop to be conducted for a short time, so that the large capacitor discharging loop is controlled to work, and the nanosecond pulse width pulse is output at the output end of the circuit.
In one embodiment of the present application, the processing module includes:
the first control unit is used for controlling the direct-current power supply to be turned on;
the access unit is used for accessing the tool electrode and the workpiece to the output end of the high-capacity capacitor discharge loop;
the second control unit is used for controlling the external pulse source to be opened and setting the type of the driving signal;
and the input unit is used for inputting a driving pulse signal, and single or continuous nanosecond narrow pulse width pulses are generated between the tool electrode and the workpiece in the type of the driving signal.
In an embodiment of the present application, the small-capacity energy storage capacitor and the large-capacity capacitor in the small-capacity discharge circuit and the large-capacity discharge circuit are respectively used for regulating and controlling a discharge pulse width and a pulse voltage, wherein the two are regulated and controlled separately.
In an embodiment of the present application, the electric pulse generated by the load resistor is nanosecond pulse width according to the capacity of the small-capacity energy storage capacitor in the small-capacity charging circuit, so as to regulate and control the pulse width of the output pulse of the large-capacity capacitor discharging circuit to be nanosecond.
Therefore, the adopted switching element is a triode, the conduction time is only a plurality of nanoseconds, the switching frequency is high, and the micro electric spark machining quality and the machining efficiency can be effectively improved; the capacitor for controlling the pulse width and the capacitor for implementing discharge output pulse are adopted for separate regulation, nanosecond pulse width pulses with extremely narrow pulse width and larger pulse voltage can be obtained, the output pulse width and the output pulse voltage can be independently regulated, and the discharge pulse energy can be accurately regulated; according to the type of an external driving pulse signal, a single or continuous nanosecond pulse with the frequency as high as 9MHz can be generated, wherein the single pulse can be used for researching a micro electric spark machining mechanism, and the continuous pulse can be applied to a micro electric spark machining process and equipment; the nanosecond pulse power supply is low in structure cost, good in stability, small in size, compact in structure and easy to integrate in micro electric spark machining equipment.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a structural diagram of a cascaded regulated nanosecond pulse power supply based on a dual avalanche transistor according to a first embodiment of the present application;
FIG. 2 is a schematic diagram of a working current path of a cascade regulation nanosecond pulse power supply based on a double avalanche triode in the embodiment of the application;
FIG. 3 is a timing diagram of the operation of a cascaded regulated nanosecond pulse power supply based on a dual avalanche transistor according to the embodiment of the present application;
fig. 4 is a flowchart illustrating the operation of the cascade regulation nanosecond pulse power supply based on the dual avalanche transistors according to the embodiment of the present application; and
fig. 5 is an example of a discharge waveform of a cascade control nanosecond pulse power supply based on a dual avalanche triode according to the embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
The following describes a tandem regulation nanosecond pulse power supply based on a dual avalanche transistor and a control method thereof according to an embodiment of the present application with reference to the drawings.
Fig. 1 is a structural diagram of a cascaded regulated nanosecond pulse power supply based on a dual avalanche transistor according to an embodiment of the present application.
As shown in fig. 1, the cascade control nanosecond pulse power supply based on the double avalanche transistors comprises: little electric capacity charge circuit (1), little electric capacity discharge circuit (2), drive pulse input circuit (3), big electric capacity charge circuit (4) and big electric capacity discharge circuit (5), little electric capacity charge circuit (1) includes: the direct current power supply (E1), a first current limiting resistor (R1), a small-capacity energy storage capacitor (C1) and a diode (D1); the small-capacitance discharge circuit (2) comprises: the low-capacity energy storage capacitor (C1), the triode (T1) and the load resistor (R4); the drive pulse input circuit (3) includes: an external pulse source (V1), a second current limiting resistor (R2) and a third current limiting resistor (R3); the large-capacitance charging circuit (4) comprises: a direct current power supply (E2), a fourth current limiting resistor (R5) and a large-capacity capacitor (C2); the large capacitance discharge circuit (5) comprises: the high-voltage power supply comprises a large-capacity capacitor (C2), a triode (T2), a fifth current-limiting resistor (R6) and positive and negative output ports.
The positive electrode of the direct current power supply (E1) is electrically connected with the first current-limiting resistor (R1), the other end of the first current-limiting resistor (R1) is electrically connected with the small-capacity energy-storage capacitor (C1), the other end of the small-capacity energy-storage capacitor (C1) is electrically connected with the positive electrode of the diode (D1), and the negative electrode of the diode (D1) is electrically connected with the negative electrode of the direct current power supply (E1) to form the small-capacity charging loop (1).
The small-capacity energy storage capacitor (C1) is electrically connected with the collector of the triode (T1), the emitter of the triode (T1) is electrically connected with the load resistor (R4), and the other end of the load resistor (R4) is electrically connected with the other end of the capacitor to form the small-capacity discharge circuit (2).
In the driving pulse input circuit, the positive output end of an external pulse source (V1) is electrically connected with a second current-limiting resistor (R2) and a third current-limiting resistor (R3), the other end of the second current-limiting resistor (R2) is electrically connected with the base of a triode (T1), the other end of the third current-limiting resistor (R3) is electrically connected with the negative output end of the external pulse source (V1), and the negative output end of the external pulse source (V1) is electrically connected with the emitter of the triode (T1) to form the driving pulse input circuit (3).
The positive electrode of the direct current power supply (E2) is electrically connected with the fourth current-limiting resistor (R5), the other end of the fourth current-limiting resistor (R5) is electrically connected with the large-capacity capacitor (C2), and the other end of the large-capacity capacitor (C2) is electrically connected with the negative electrode of the direct current power supply (E2) to form the large-capacity charging loop (4).
The high-capacity capacitor (C2) is electrically connected with a collector of the triode (T2), a base electrode and an emitting electrode of the triode (T2) are respectively electrically connected with two ends of a load resistor (R4) in the small-capacity discharge circuit (2) for controlling pulse width, an emitting electrode of the triode (T2) is electrically connected with a fifth current-limiting resistor (R6), the other end of the fifth current-limiting resistor (R6) is electrically connected with a positive output port, and a negative output port is electrically connected with the other end of the high-capacity capacitor (C2) to form the large-capacity discharge circuit (5).
In an embodiment of the present application, a method for controlling a cascaded regulated nanosecond pulse power supply based on a dual avalanche transistor includes: when the driving pulse input circuit inputs a pulse signal, the triode in the small capacitor discharging loop is conducted, nanosecond narrow pulse width pulse is generated on the load resistor, the triode in the large capacitor discharging loop is conducted for a short time through the nanosecond narrow pulse width pulse, the large capacitor discharging loop is controlled to work, and the nanosecond pulse width pulse is output at the output end of the circuit.
In one embodiment of the application, the method is realized by controlling the direct current power supply to be turned on; connecting a tool electrode and a workpiece to the output end of a high-capacity capacitor discharge loop; controlling an external pulse source to be opened, and setting the type of a driving signal; the drive pulse signal is input to generate a single or continuous nanosecond narrow pulse width pulse between the tool electrode and the workpiece in the type of drive signal.
In one embodiment of the present application, the small-capacity energy storage capacitor and the large-capacity capacitor in the small-capacity discharge circuit and the large-capacity discharge circuit are respectively used for regulating and controlling the discharge pulse width and the pulse voltage, wherein the two are regulated and controlled separately.
In one embodiment of the application, the electric pulse generated on the load resistor is nanosecond pulse width according to the capacity of the small-capacity energy storage capacitor in the small-capacity capacitor charging circuit, so that the pulse width output by the large-capacity capacitor discharging circuit is regulated to be nanosecond.
In an embodiment of the present application, the voltage at the two ends in the discharging process is at the first specific value according to the capacity of the large-capacity capacitor in the large-capacity discharging circuit, so that the pulse voltage of the output pulse is kept at the second specific value, that is, the capacity of the energy storage capacitor in the large-capacity discharging circuit is large, and it is ensured that the voltage at the two ends in the discharging process is kept unchanged, thereby ensuring that the pulse voltage of the output pulse is kept stable.
In order to more clearly describe the above embodiments, the following examples are described in detail.
Specifically, as shown in fig. 1, the parameter example ranges of the components are as follows: current limiting resistors (R1-R3, R5, R6): 10-1000 ohms, control resistance (R4): 10-200 ohm, diode D1: diode with withstand voltage of over 150V, small capacity capacitor (C1): 3pF-200pF, bulk capacitance (C2): 200pF-1000nF, triode (T1) and triode (T2): and the triode with extremely high conduction speed comprises but is not limited to models MCH3245, BFS17PE6327 and the like.
The main working process of the cascade regulation nanosecond pulse power supply based on the double avalanche triodes is as follows: at time t1 in fig. 3, power supplies E1, E2 charge C1, C2, respectively (the current paths are shown as dashed line 1 and dashed line 5 in fig. 2), until time t 2C 1 is full; at time t3 in fig. 3, when the V1 outputs a trigger pulse (the current path is as shown by the dashed line 2 in fig. 2), due to the polarity of the diode D1, the capacitor C1 discharges the load resistor R4 (the current path is as shown by the dashed line 4 in fig. 2), and the discharge is ended until the electric quantity of the capacitor C1 is exhausted at time t7, the discharge of the capacitor C1 causes the voltage Δ U to be generated across the resistor R4, and at the same time, the power supply E1 also generates a certain current loop (the current path is as shown by the dashed line 3 in fig. 2) through the resistor R1 and the triode, and the loop current has little influence on the discharge loop on the discharge load R4. At time T4-T5 in fig. 3, Δ U is greater than the turn-on voltage Uon of the transistor T2, and this portion of the voltage pulse will turn on the transistor T2 for a short period of several nanoseconds, at which time the capacitor C2 discharges (as indicated by the dashed line 6 in fig. 2), and an electrical pulse with a pulse width of several nanoseconds is output between the positive and negative output ports, which can be achieved with a pulse width less than the width of the drive pulse at R4. When the stored energy of the capacitor C1 is exhausted (at time t7 in fig. 3), no current flows through the load resistor R4, and the current passes through the dashed line 3 and the dashed line 5 in fig. 2 to form a loop until the trigger pulse output by the V1 is ended (at time t8 in fig. 3), and the next cycle is performed.
As shown in fig. 4, the nanosecond pulse power supply operation flow separately regulated and controlled by the output pulse voltage and the pulse width of the invention is as follows: (1) turning on the direct current power supplies E1 and E2, wherein the input range of the direct current power supplies is 0V-150V; (2) connecting a tool electrode and a workpiece to the output end of a large-capacity capacitance discharge loop; (3) opening an external pulse source, and adjusting the parameters of a driving pulse signal source, wherein the amplitude of the driving pulse signal is 0-15V, and the frequency can be 0Hz-100 MHz; (4) when the trigger pulse input by the external pulse source is a single pulse, a single narrow pulse width pulse as shown in fig. 5(a) is generated between the tool electrode and the workpiece; if the input trigger pulse is a continuous pulse, continuous narrow pulse width pulses are generated between the tool electrode and the workpiece in accordance with the frequency of the externally input trigger pulse as shown in fig. 5 (b).
Therefore, the adopted switching element is a triode, the conduction time is only a plurality of nanoseconds, the switching frequency is high, and the micro electric spark machining quality and the machining efficiency can be effectively improved; the capacitor for controlling the pulse width and the capacitor for implementing discharge output pulse are adopted for separate regulation, nanosecond pulse width pulses with extremely narrow pulse width and larger pulse voltage can be obtained, the output pulse width and the output pulse voltage can be independently regulated, and the discharge pulse energy can be accurately regulated; according to the type of an external driving pulse signal, a single or continuous nanosecond pulse with the frequency as high as 9MHz can be generated, wherein the single pulse can be used for researching a micro electric spark machining mechanism, and the continuous pulse can be applied to a micro electric spark machining process and equipment; the nanosecond pulse power supply is low in structure cost, good in stability, small in size, compact in structure and easy to integrate in micro electric spark machining equipment.
In an embodiment of the present application, a control device for regulating and controlling a nanosecond pulse power supply in a cascade manner based on a dual avalanche transistor is provided, including: and the processing module is used for conducting a triode in the small capacitor discharge loop when the driving pulse input circuit inputs a pulse signal and generating a nanosecond narrow pulse width pulse on the load resistor, wherein the nanosecond narrow pulse width pulse enables the triode in the large capacitor discharge loop to be conducted for a short time, so that the large capacitor discharge loop is controlled to work, and the nanosecond pulse width pulse is output at the output end of the circuit.
In one embodiment of the present application, a processing module includes: the first control unit is used for controlling the direct-current power supply to be turned on; the access unit is used for accessing the tool electrode and the workpiece to the output end of the high-capacity capacitor discharge loop; the second control unit is used for controlling the external pulse source to be opened and setting the type of the driving signal; and the input unit is used for inputting a driving pulse signal, and single or continuous nanosecond narrow pulse width pulses are generated between the tool electrode and the workpiece in the type of the driving signal.
In one embodiment of the present application, the small-capacity energy storage capacitor and the large-capacity capacitor in the small-capacity discharge circuit and the large-capacity discharge circuit are respectively used for regulating and controlling a discharge pulse width and a pulse voltage, wherein the two are separately regulated and controlled.
In one embodiment of the application, according to the capacity of the small-capacity energy storage capacitor in the small-capacity charging circuit, the electric pulse generated on the load resistor is nanosecond pulse width, so that the pulse width of the output pulse of the large-capacity capacitor discharging circuit is regulated and controlled to be nanosecond.
Therefore, the adopted switching element is a triode, the conduction time is only a plurality of nanoseconds, the switching frequency is high, and the micro electric spark machining quality and the machining efficiency can be effectively improved; the capacitor for controlling the pulse width and the capacitor for implementing discharge output pulse are adopted for separate regulation, nanosecond pulse width pulses with extremely narrow pulse width and larger pulse voltage can be obtained, the output pulse width and the output pulse voltage can be independently regulated, and the discharge pulse energy can be accurately regulated; according to the type of an external driving pulse signal, a single or continuous nanosecond pulse with the frequency as high as 9MHz can be generated, wherein the single pulse can be used for researching a micro electric spark machining mechanism, and the continuous pulse can be applied to a micro electric spark machining process and equipment; the nanosecond pulse power supply is low in structure cost, good in stability, small in size, compact in structure and easy to integrate in micro electric spark machining equipment.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., 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 application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a sequential list of executable instructions that may be thought of as being useful for implementing logical functions, may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that may fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: discrete logic circuits with logic gates for implementing logic functions on data signals, application specific integrated circuits with appropriate combinational logic gates, Programmable Gate Arrays (PGAs), Field Programmable Gate Arrays (FPGAs), etc.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware that can be related to instructions of a program, which can be stored in a computer-readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (9)
1. A cascade control nanosecond pulse power supply based on a double avalanche triode is characterized by comprising: little electric capacity charge circuit (1), little electric capacity discharge circuit (2), drive pulse input circuit (3), big electric capacity charge circuit (4) and big electric capacity discharge circuit (5), little electric capacity charge circuit (1) includes: the circuit comprises a direct current power supply (E1), a first current-limiting resistor (R1), a small-capacity energy storage capacitor (C1) and a diode (D1); the small-capacitance discharge circuit (2) comprises: the low-capacity energy storage capacitor (C1), the triode (T1) and the load resistor (R4); the drive pulse input circuit (3) includes: an external pulse source (V1), a second current limiting resistor (R2) and a third current limiting resistor (R3); the large-capacitance charging circuit (4) comprises: a direct current power supply (E2), a fourth current-limiting resistor (R5) and a large-capacity capacitor (C2); the large capacitance discharge circuit (5) comprises: the high-capacity capacitor (C2), the triode (T2), the fifth current-limiting resistor (R6) and the positive and negative output ports;
the positive electrode of the direct current power supply (E1) is electrically connected with the first current-limiting resistor (R1), the other end of the first current-limiting resistor (R1) is electrically connected with the small-capacity energy-storage capacitor (C1), the other end of the small-capacity energy-storage capacitor (C1) is electrically connected with the positive electrode of the diode (D1), and the negative electrode of the diode (D1) is electrically connected with the negative electrode of the direct current power supply (E1) to form the small-capacity charging circuit (1);
the small-capacity energy storage capacitor (C1) is electrically connected with the collector of the triode (T1), the emitter of the triode (T1) is electrically connected with the load resistor (R4), and the other end of the load resistor (R4) is electrically connected with the other end of the capacitor to form the small-capacity discharge loop (2);
in the driving pulse input circuit, the positive output end of the external pulse source (V1) is electrically connected with the second current-limiting resistor (R2) and the third current-limiting resistor (R3), the other end of the second current-limiting resistor (R2) is electrically connected with the base of the triode (T1), the other end of the third current-limiting resistor (R3) is electrically connected with the negative output end of the external pulse source (V1), and the negative output end of the external pulse source (V1) is electrically connected with the emitter of the triode (T1) to form the driving pulse input circuit (3);
the positive electrode of the direct current power supply (E2) is electrically connected with the fourth current-limiting resistor (R5), the other end of the fourth current-limiting resistor (R5) is electrically connected with the large-capacity capacitor (C2), and the other end of the large-capacity capacitor (C2) is electrically connected with the negative electrode of the direct current power supply (E2) to form the large-capacity charging loop (4);
the high-capacity capacitor (C2) is electrically connected with the collector of the triode (T2), the base and the emitter of the triode (T2) are respectively electrically connected with the two ends of the load resistor (R4) in the small-capacity discharge circuit (2) for controlling pulse width, the emitter of the triode (T2) is electrically connected with the fifth current-limiting resistor (R6), the other end of the fifth current-limiting resistor (R6) is electrically connected with the positive output port, and the negative output port is electrically connected with the other end of the high-capacity capacitor (C2) to form the high-capacity discharge circuit (5).
2. The control method for the nanosecond pulse power supply based on the cascade regulation of the double avalanche transistors as claimed in claim 1, comprising:
when the driving pulse input circuit inputs a pulse signal, the triode in the small capacitor discharging loop is conducted, nanosecond narrow pulse width pulse is generated on the load resistor, the triode in the large capacitor discharging loop is conducted for a short time through the nanosecond narrow pulse width pulse, the large capacitor discharging loop is controlled to work, and the nanosecond pulse width pulse is output at the output end of the circuit;
and the small-capacity energy storage capacitor and the large-capacity capacitor in the small-capacity discharge circuit and the large-capacity discharge circuit are respectively used for regulating and controlling the pulse width and the pulse voltage of the discharge pulse, wherein the small-capacity energy storage capacitor and the large-capacity capacitor are separately regulated and controlled.
3. The control method as claimed in claim 2, wherein when the driving pulse input circuit inputs a pulse signal, the transistor in the small capacitor discharge circuit is turned on, and a nanosecond narrow pulse width pulse is generated on the load resistor, the nanosecond narrow pulse width pulse makes the transistor in the large capacitor discharge circuit turned on very briefly, and controls the large capacitor discharge circuit to operate, and the nanosecond pulse width pulse is output at the circuit output terminal, and the method comprises the following steps:
controlling the direct current power supply to be turned on;
connecting a tool electrode and a workpiece to the output end of the high-capacity capacitor discharge loop;
controlling an external pulse source to be opened, and setting the type of a driving signal;
inputting a drive pulse signal, and generating single or continuous nanosecond narrow pulse width pulses between the tool electrode and the workpiece according to the type of the drive signal.
4. The control method according to claim 2,
and according to the capacity of the small-capacity energy storage capacitor in the small-capacity charging circuit, the electric pulse generated on the load resistor is in nanosecond pulse width, so that the pulse width of the pulse output by the large-capacity capacitor discharging circuit is regulated and controlled to be in nanosecond level.
5. The control method according to claim 2,
and according to the capacity of the large-capacity capacitor in the large-capacity discharge loop, the voltage at two ends is kept at a first specific value in the discharge process, so that the pulse voltage of the output pulse is kept at a second specific value.
6. A control device for regulating nanosecond pulse power supply based on cascade of double avalanche transistors as claimed in claim 1, wherein said device comprises:
and the processing module is used for conducting the triode in the small capacitor discharging loop when the driving pulse input circuit inputs a pulse signal and generating a nanosecond narrow pulse width pulse on the load resistor, wherein the nanosecond narrow pulse width pulse enables the triode in the large capacitor discharging loop to be conducted for a short time, so that the large capacitor discharging loop is controlled to work, and the nanosecond pulse width pulse is output at the output end of the circuit.
7. The control apparatus of claim 6, wherein the processing module comprises:
the first control unit is used for controlling the direct-current power supply to be turned on;
the access unit is used for accessing the tool electrode and the workpiece to the output end of the high-capacity capacitor discharge loop;
the second control unit is used for controlling the external pulse source to be opened and setting the type of the driving signal;
and the input unit is used for inputting a driving pulse signal, and generating single or continuous nanosecond narrow pulse width pulses between the tool electrode and the workpiece according to the type of the driving signal.
8. The control device of claim 6,
and the small-capacity energy storage capacitor and the large-capacity capacitor in the small-capacity discharge circuit and the large-capacity discharge circuit are respectively used for regulating and controlling the pulse width and the pulse voltage of the discharge pulse, wherein the small-capacity energy storage capacitor and the large-capacity capacitor are separately regulated and controlled.
9. The control device of claim 6,
and according to the capacity of the small-capacity energy storage capacitor in the small-capacity charging circuit, the electric pulse generated on the load resistor is in nanosecond pulse width, so that the pulse width of the pulse output by the large-capacity capacitor discharging circuit is regulated and controlled to be in nanosecond level.
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| CN110247644B (en) * | 2019-06-26 | 2021-03-12 | 清华大学 | Nanosecond pulse power supply for micro electric spark machining based on avalanche triode |
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