CN212627704U - Special pure power supply device for cable oscillatory wave partial discharge test system - Google Patents
Special pure power supply device for cable oscillatory wave partial discharge test system Download PDFInfo
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- CN212627704U CN212627704U CN202020076955.6U CN202020076955U CN212627704U CN 212627704 U CN212627704 U CN 212627704U CN 202020076955 U CN202020076955 U CN 202020076955U CN 212627704 U CN212627704 U CN 212627704U
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Abstract
The utility model discloses a special pure power supply unit of test system is put in cable oscillatory wave office, including drive control circuit integrated control circuit's output pin and drive control circuit's input pin electric connection, drive control circuit's output pin and power amplification circuit's input pin electric connection, test system electric connection is put in power amplification circuit's output pin and external cable oscillatory wave office. The special pure power supply device for the cable oscillatory wave partial discharge test system stops the interference of digital noise on the oscillatory wave partial discharge test system, can realize the excellent performance of no digital noise of the whole machine, can adapt to the requirements of different power levels, meets the requirements of other similar precise instruments on the power supply under the laboratory environment, really achieves multiple purposes, and does not need to redesign a circuit structure.
Description
Technical Field
The utility model relates to a power supply unit specifically is a special pure power supply unit of test system is put in cable oscillatory wave office.
Background
The cable oscillatory wave partial discharge test system is equipment for testing and positioning partial discharge of a power cable, and is widely applied in the world. Because the application environment of the cable is very complicated, such as in mountainous areas, fields, and transformer substations and power utilization facilities which are not built, the on-site working power supply is very difficult to take, and the most common way at the present stage is to provide the working power supply of a test system by various gasoline and diesel generating sets. Various common emergency inverter power supplies based on a digital chopper circuit (SPWM) control mode cannot be applied to a partial discharge test system due to high-frequency interference.
The prior art has the following disadvantages:
(1) the generator set is large in size and extremely heavy, and great influence is caused on rapid field test.
(2) Because the working noise of the generator set is large, the fault discharge point and the discharge type are judged in the test process, and the fault discharge point and the discharge type are difficult to eliminate.
(3) The conventional emergency power supply based on the SPWM control mode is not allowed to be used in an oscillation wave partial discharge test system.
Therefore, a pure power supply device special for a cable oscillatory wave partial discharge test system is provided.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a special pure power supply unit of test system is put in cable oscillatory wave office to solve the problem that provides in the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: a pure power supply device special for a cable oscillatory wave partial discharge test system comprises a drive control circuit and an integrated control circuit, wherein an output pin of the integrated control circuit is electrically connected with an input pin of the drive control circuit, an output pin of the drive control circuit is electrically connected with an input pin of a power amplification circuit, and an output pin of the power amplification circuit is electrically connected with an external cable oscillatory wave partial discharge test system;
the driving control circuit comprises a CPU control chip, a first power amplifier, a second power amplifier and a driving transformer, wherein the CPU control chip generates sine waves, a BTL circuit formed by the first power amplifier and the second power amplifier generates sine wave signals for driving a rear-stage power amplification circuit, and four sine wave driving signals with 180-degree phase difference are separated by the driving transformer and output to the power amplification circuit for use;
the power amplification circuit comprises first triode, second triode, third triode, fourth triode and step-up transformer, first triode, second triode, third triode and fourth triode array distribute and form the H bridge and pass through step-up transformer and external cable oscillatory wave partial discharge test system electric connection.
Preferably, the input resistance of the first power amplifier is 1K, the inverting amplification resistance is 20K, the input resistance of the second power amplifier is 20K, and the inverting amplification resistance is 20K.
Preferably, the first triode is composed of a preceding stage amplifying transistor, an amplifying transistor, a first resistor, a first potentiometer, a second resistor, a first base current limiting resistor, a second base current limiting resistor, a first emitter resistor, a second emitter resistor, a third emitter resistor, a fourth emitter resistor, a fifth emitter resistor, a sixth emitter resistor, a first base driving clamping diode, a second base driving clamping diode, a third base driving clamping diode and an inductive load freewheeling diode, the first triode is composed of a group of preceding stage amplifying transistors and a group of five amplifying transistors which are connected in parallel, and a first base driving clamping diode, a second base driving clamping diode and a third base driving clamping diode are connected in parallel between the preceding stage amplifying transistor and the amplifying transistor, the first resistor, the first potentiometer and the second resistor form a direct current bias circuit and are connected with the preceding stage amplifying transistor in parallel, the first base current limiting resistor and the second base current limiting resistor are base current limiting resistors, the first base current limiting resistor is electrically connected with the preceding stage amplifying transistor, the inductive load freewheeling diode is electrically connected with the amplifying transistor, and the bottoms of the five groups of amplifying transistors are respectively connected with the first emitter resistor, the second emitter resistor, the third emitter resistor, the fourth emitter resistor, the fifth emitter resistor and the sixth emitter resistor in series.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the whole machine design abandons the conventional power supply design method, and adopts the design of replacing the conventional DCDC power supply with linear power supplies and analog power supplies such as LDO (low dropout regulator), a charge pump and the like, thereby avoiding the interference of digital noise on the oscillation wave partial discharge test system;
(2) the driving part circuit adopts a linear power amplifier to form a BTL driving circuit, so that switching noise introduced into a rear-stage power amplifying circuit by adopting a D-type power amplifier is prevented, and the excellent performance of no digital noise of the whole machine is realized;
(3) by adopting the mode that the triode works in the linear amplification area and the parallel design method, the switching noise of the whole machine is close to zero, an excellent working power supply with low distortion degree and high frequency stability is provided for the oscillating wave partial discharge test system, and the adverse effect on the test result caused by the introduction of the switching noise from the power supply is avoided. The modular design is very beneficial to the expansion and upgrade of the power amplifying circuit, the parallel connection quantity of the electrode tubes can be randomly combined from 1 to 25, so that the power of the power supply device can be adjusted within the range from 500W to 2000W, the requirements of different power grades are met, the requirements of other similar precise instruments on a power supply under a laboratory environment are met, the purpose of one machine for multiple purposes is really achieved, and the circuit structure does not need to be redesigned.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
fig. 2 is a schematic diagram of a driving control circuit of the present invention;
FIG. 3 is a schematic diagram of a power amplifying circuit of the present invention;
fig. 4 is a schematic diagram of a first triode circuit according to the present invention;
fig. 5 is the structure diagram of the step-up transformer of the present invention.
In the figure: 1 drive control circuit, 2 power amplification circuit, 3 integrated control circuit, 11CPU control chip, 12 first power amplifier, 13 second power amplifier, 14 drive transformer, 21 first triode, 22 second triode, 23 third triode, 24 fourth triode, 25 step-up transformer, 26 pre-amplifier transistor, 27 amplifier transistor, 28 first resistor, 29 first potentiometer, 210 second resistor, 211 first base current-limiting resistor, 212 second base current-limiting resistor, 213 first emitter resistor, 214 second emitter resistor, 215 third emitter resistor, 216 fourth emitter resistor, 217 fifth emitter resistor, 218 sixth emitter resistor, 219 first base drive clamp diode, 220 second base drive clamp diode, 221 third base drive clamp diode, 222 inductive load freewheel diode
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: a pure power supply device special for a cable oscillatory wave partial discharge test system comprises a drive control circuit 1 and an integrated control circuit 3, wherein an output pin of the integrated control circuit 3 is electrically connected with an input pin of the drive control circuit 1, an output pin of the drive control circuit 1 is electrically connected with an input pin of a power amplification circuit 2, and an output pin of the power amplification circuit 2 is electrically connected with an external cable oscillatory wave partial discharge test system;
the driving control circuit 1 comprises a CPU control chip 11, a first power amplifier 12, a second power amplifier 13 and a driving transformer 14, wherein the CPU control chip 11 generates sine waves, a BTL circuit formed by the first power amplifier 12 and the second power amplifier 13 generates sine wave signals for driving a rear-stage power amplifying circuit, and the driving transformer 14 separates four sine wave driving signals with 180-degree phase difference from each other and outputs the sine wave driving signals to the power amplifying circuit 2 for use;
the power amplification circuit 2 comprises first triode 21, second triode 22, third triode 23, fourth triode 24 and step-up transformer 25, first triode 21, second triode 22, third triode 23 and the 24 array distribution of fourth triode form the H bridge through step-up transformer 25 with external cable oscillatory wave partial discharge test system electric connection.
Preferably, the input resistance of the first power amplifier 12 is 1K, the inverting amplification resistance is 20K, the input resistance of the second power amplifier 13 is 20K, and the inverting amplification resistance is 20K.
Preferably, the first transistor 21, the second transistor 22, the third transistor 23 and the fourth transistor 24 have the same structure, the first transistor 21 is composed of a pre-amplifier transistor 26, an amplifier transistor 27, a first resistor 28, a first potentiometer 29, a second resistor 210, a first base current-limiting resistor 211, a second base current-limiting resistor 212, a first emitter resistor 213, a second emitter resistor 214, a third emitter resistor 215, a fourth emitter resistor 216, a fifth emitter resistor 217, a sixth emitter resistor 218, a first base driving clamping diode 219, a second base driving clamping diode 220, a third base driving clamping diode 221 and an inductive load freewheeling diode 222, the first transistor 21 is composed of a set of pre-amplifier transistors 26 and five sets of amplifier transistors 27 connected in parallel, and a first base driving clamping diode 219 is connected between the pre-amplifier transistor 26 and the amplifier transistor 27 in parallel, The first resistor 28, the first potentiometer 29 and the second resistor 210 form a direct current bias circuit and are connected in parallel with the pre-amplifier transistor 26, the first base current-limiting resistor 211 and the second base current-limiting resistor 212 are base current-limiting resistors, the first base current-limiting resistor 211 is electrically connected with the pre-amplifier transistor 26, the inductive load freewheeling diode 222 is electrically connected with the amplifier transistor 27, and the bottom of the five groups of amplifier transistors 27 are respectively connected in series with a first emitter resistor 213, a second emitter resistor 214, a third emitter resistor 215, a fourth emitter resistor 216, a fifth emitter resistor 217 and a sixth emitter resistor 218.
The step-up transformer 25 is replaced by an external 340V battery pack and a high-voltage power module to directly boost.
All low-voltage power transistors in the preceding-stage amplifying transistor 26 and the amplifying transistor 27 are replaced by high-voltage power transistors, and the freewheeling diode is replaced by an RHRG75120 diode, so that the purpose of directly outputting pure sine waves of alternating current 220V without a step-up transformer can be realized.
The step-up transformer 25 steps up the output low-voltage of the power amplification output circuit to the alternating 220V pure sine wave required by the oscillatory wave test system, and simultaneously feeds back the output voltage waveform to the driving transformer 14, thereby realizing the waveform closed-loop control.
The first transistor 21, the second transistor 22, the third transistor 23 and the fourth transistor 24 have the same components, and are different in that the phase of the driving signal input by each transistor is different. The diagonal transistors input drive signals have the same phase, the first transistor 21 and the fourth transistor 24 have the same phase, and the second transistor 22 and the third transistor 23 have the same phase.
The related modules involved in the system are all hardware system modules or functional modules combining computer software programs or protocols with hardware in the prior art, and the computer software programs or the protocols involved in the functional modules are all known in the technology of persons skilled in the art, and are not improvements of the system; the improvement of the system is the interaction relation or the connection relation among all the modules, namely the integral structure of the system is improved, so as to solve the corresponding technical problems to be solved by the system.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. The utility model provides a special pure power supply unit of test system is put in cable oscillatory wave office, includes drive control circuit (1), its characterized in that: an output pin of the integrated control circuit (3) is electrically connected with an input pin of the drive control circuit (1), an output pin of the drive control circuit (1) is electrically connected with an input pin of the power amplification circuit (2), and an output pin of the power amplification circuit (2) is electrically connected with an external cable oscillation wave partial discharge test system;
the drive control circuit (1) comprises a CPU control chip (11), a first power amplifier (12), a second power amplifier (13) and a drive transformer (14), wherein the CPU control chip (11) generates sine waves, a BTL circuit formed by the first power amplifier (12) and the second power amplifier (13) generates sine wave signals for driving a rear-stage power amplification circuit, and four sine wave drive signals with 180-degree phase difference are separated by the drive transformer (14) and output to the power amplification circuit (2) for use;
the power amplification circuit (2) comprises first triode (21), second triode (22), third triode (23), fourth triode (24) and step-up transformer (25), first triode (21), second triode (22), third triode (23) and fourth triode (24) array distribution form the H bridge through step-up transformer (25) and external cable oscillation wave partial discharge test system electric connection.
2. The pure power supply device special for the cable oscillatory wave partial discharge test system according to claim 1, characterized in that: the input resistance of the first power amplifier (12) is 1K, the inverting amplification resistance is 20K, the input resistance of the second power amplifier (13) is 20K, and the inverting amplification resistance is 20K.
3. The pure power supply device special for the cable oscillatory wave partial discharge test system according to claim 1, characterized in that: the triode (21), the second triode (22), the third triode (23) and the fourth triode (24) are identical in structure, the first triode (21) is composed of a pre-amplifier transistor (26), an amplifier transistor (27), a first resistor (28), a first potentiometer (29), a second resistor (210), a first base current-limiting resistor (211), a second base current-limiting resistor (212), a first emitter resistor (213), a second emitter resistor (214), a third emitter resistor (215), a fourth emitter resistor (216), a fifth emitter resistor (217), a sixth emitter resistor (218), a first base driving clamping diode (219), a second base driving clamping diode (220), a third base driving clamping diode (221) and an inductive load freewheeling diode (222), the first triode (21) is composed of a group of pre-amplifier transistors (26) and a group of five amplifying transistors (27) which are connected in parallel, a first base driving clamping diode (219), a second base driving clamping diode (220) and a third base driving clamping diode (221) are connected in parallel between the preceding stage amplification transistor (26) and the amplification transistor (27), a direct current bias circuit is formed by the first resistor (28), the first potentiometer (29) and the second resistor (210) and is connected with the preceding stage amplification transistor (26) in parallel, the first base current limiting resistor (211) and the second base current limiting resistor (212) are base current limiting resistors, the first base current limiting resistor (211) is electrically connected with the preceding stage amplification transistor (26), the inductive load freewheeling diode (222) is electrically connected with the amplification transistor (27), and the bottoms of the five groups of amplification transistors (27) are respectively connected with a first emitter resistor (213), a second emitter resistor (214), a third emitter resistor (215) in series, A fourth emitter resistor (216), a fifth emitter resistor (217), and a sixth emitter resistor (218).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020076955.6U CN212627704U (en) | 2020-01-15 | 2020-01-15 | Special pure power supply device for cable oscillatory wave partial discharge test system |
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| CN202020076955.6U CN212627704U (en) | 2020-01-15 | 2020-01-15 | Special pure power supply device for cable oscillatory wave partial discharge test system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114221315A (en) * | 2021-12-14 | 2022-03-22 | 广东福德电子有限公司 | Efficient direct-current resistance-inductance load quick disconnection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114221315A (en) * | 2021-12-14 | 2022-03-22 | 广东福德电子有限公司 | Efficient direct-current resistance-inductance load quick disconnection method |
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