CN203219186U - High stability frequency conversion power supply specially used for power maintenance test equipment metering verification - Google Patents

High stability frequency conversion power supply specially used for power maintenance test equipment metering verification Download PDF

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Publication number
CN203219186U
CN203219186U CN 201320067088 CN201320067088U CN203219186U CN 203219186 U CN203219186 U CN 203219186U CN 201320067088 CN201320067088 CN 201320067088 CN 201320067088 U CN201320067088 U CN 201320067088U CN 203219186 U CN203219186 U CN 203219186U
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China
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circuit
voltage
power supply
spwm
current
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CN 201320067088
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Chinese (zh)
Inventor
陈纓
雷民
袁恒
徐子立
罗涛
张军
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Sichuan Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Sichuan Electric Power Co Ltd
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Priority to CN 201320067088 priority Critical patent/CN203219186U/en
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Publication of CN203219186U publication Critical patent/CN203219186U/en
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Abstract

A high stability frequency conversion power supply specially used for power maintenance test equipment metering verification is provided; a rectification filter circuit converting AC current to DC current and an inversion circuit converting DC current to AC current are in a cascade connection; an output terminal of the inversion circuit is connected with a preliminary coil of an isolation transformer; and a secondary coil of the isolation transformer is connected with a signal input terminal of a low voltage reactive compensation circuit. A signal output terminal of a buffer starting circuit mainly formed by time relays is connected with a signal input terminal of the rectification filter circuit. The high stability frequency conversion power supply is provided with input/output power isolation protection function, has automatic voltage stabilization function, is adjustable in frequency width and output voltage, and is good in anti-interference performance.

Description

The special-purpose high stability variable frequency power supply of a kind of electric power overhaul testing equipment metering verification
Technical field
The utility model relates to the supply unit that a kind of electric power control test apparatus is used, and particularly is matched in the AC frequency conversion supply unit of the high stability used electric power overhaul testing equipment mobile laboratory, frequency conversion, sine wave, little distortion.
Background technology
The vital task of diagnosing the converting equipment defective is being born in the experiment work of power transmission and transformation repair based on condition of component, and the safe operation that ensures electrical network is had important function.But at present the work of tracing to the source of the accuracy of repair based on condition of component test apparatus and equipment and function is all carried out in the laboratory that each provincial DianKeYuan possesses stabilized power supply system, constant temperature, constant humidity, can not be carried out calibration operation to equipment in real time.Researched and developed electric power overhaul testing equipment mobile laboratory with situation accordingly, the calibration that can the carry out equipment to the doorstep work of tracing to the source, but parameters such as the stability of field power supply, frequency, waveform and distortion usually can't satisfy the test requirements document of reference instrument equipment.Therefore need a kind of special-purpose assorted in the special-purpose high stable power supply of electric power overhaul testing equipment mobile laboratory.
The utility model content
The purpose of this utility model provides a kind of special-purpose high stability variable frequency power supply of electric power overhaul testing equipment metering verification with the protection of input and output isolated from power.
This novel purpose is achieved in that a kind of electric power overhaul testing equipment metering verification variable frequency power supply, comprise and change alternating current into galvanic current rectifying and wave filtering circuit, direct current is changed into the inverter circuit of alternating current, the low-pressure reactive compensation circuit, described current rectifying and wave filtering circuit and described inverter circuit cascade; Also have isolating transformer and step-up transformer;
The output of described inverter circuit is connected with the primary coil of isolating transformer, and the secondary coil of isolating transformer is connected with the signal input part of described low-pressure reactive compensation circuit.
Also has the buffer starting circuit of mainly being formed by the time relay; The signal output part of buffer starting circuit is connected with the signal input part of described current rectifying and wave filtering circuit.
Described inverter circuit is the voltage-regulation voltage-stabilization power inversion circuit; Also has filter circuit, low pressure feedback circuit, single-chip microcomputer SPWM pulse-width modulation automatic voltage regulation circuit, high pressure feedback automatic Regulation voltage stabilizing circuit and IGBT drive circuit; Filter circuit is connected with the isolating transformer secondary coil; High pressure feedback automatic Regulation voltage stabilizing circuit by high-pressure sampling feedback circuit, single-chip microcomputer treatment circuit, D/A change-over circuit and PID circuit in turn cascade form;
Above-mentioned PID circuit is made up of three utmost point operational amplifiers, and first utmost point operational amplifier is formed plus and minus calculation amplifying circuit and differential circuit, and second level operational amplifier is formed integrating circuit, and the 3rd utmost point operational amplifier is formed anti-phase summation amplifying circuit;
The input of above-mentioned high-pressure sampling feedback circuit is connected with the high pressure feedback end of step-up transformer;
Above-mentioned single-chip microcomputer SPWM pulse-width modulation automatic voltage regulation circuit is composed as follows: rectification circuit is connected with triangle wave circuit and DDS circuit respectively, the DDS circuit is cascade D/A controller, sinusoidal wave circuit and SPWM combiner circuit in turn, and the signal output part of triangle wave circuit is connected with the SPWM combiner circuit; The signal output part of SPWM combiner circuit is connected with IGBT drive circuit signal input part, and the signal output part of IGBT drive circuit is connected with the voltage-regulation voltage-stabilization power inversion circuit; The signal output part of above-mentioned PID circuit is connected with SPWM combiner circuit signal input part.
Also have low pressure feedback circuit and PID controller; The signal input part of low pressure feedback circuit is connected with the signal output part of described filter circuit, and the signal output part of low pressure feedback circuit is connected with the PID controller, and the PID controller is connected with the D/A controller.
Also have with overheating detection circuit and the protective circuit of making isolating transformer is carried out temperature monitoring; Overheating detection circuit is connected with protective circuit.
Also has the measurement display circuit: because the low pressure feedback circuit connects to show the display circuit of low voltage voltage measurement data, frequency measurement data and low-tension current measurement data and is connected with the high-pressure sampling feedback circuit to show that another display circuit of high voltage measuring data forms.
The utility model be will input electric main through slow-start circuit, current rectifying and wave filtering circuit output DC source to the voltage-regulation voltage-stabilization power inversion circuit, and by by the voltage stabilizing circuit control of single-chip microcomputer SPWM pulse-width modulation automatic voltage regulation circuit and high pressure feedback automatic Regulation and drive the voltage-regulation voltage-stabilization power inversion circuit by the IGBT drive circuit and convert the direct current of input to possess automatic adjustment voltage and high stable feedback alternating current.Thereby the above-mentioned alternating current of voltage-regulation voltage-stabilization power inversion circuit output is connected to stability, power factor, band reactive load ability and the wave distortion etc. that isolating transformer, filter circuit and low-pressure reactive compensation circuit further improve high stability sinusoidal wave AC frequency conversion power supply out-put supply.When being used for the power supply input of power transmission and transformation repair based on condition of component test, can effectively reduce the environmental error that stability, wave distortion etc. because of the input power supply are introduced.
The beneficial effects of the utility model are:
1, the utility model used soft-start circuit to carry out earlier logical ripple pair starting current less, frequency stabilization starts high-power pressure regulation inversion module time slack in the voltage-regulation voltage-stabilization power inversion circuit, thereby effectively protected the charge effects because of big capacity storage capacitor, the damage that very big impulse current causes high-power pressure regulation inversion module can occur in the system;
2, the utility model uses the high and low pressure feedback to adopt and adopt the voltage stabilizing circuit of two kinds of modes to improve the stability of output voltage; The utilization isolating transformer will import power supply and the out-put supply loop isolates;
3, the utility model uses the mode of low-pressure reactive compensation to effectively raise carrying load ability and the wave distortion of power supply.And possess measuring circuit in real time such as high tension voltage measurement, low voltage voltage measurement, frequency measurement and low voltage voltage measurement, thereby hommization apply in the verification of power transmission and transformation repair based on condition of component testing equipment and go.
The utlity model has that automatic voltage regulation, regulating frequency are wide, output voltage work adjustable extent big, high efficiency, characteristics such as circuit is succinct and interference free performance is good.
Figure of description
Fig. 1 is the utility model high stability variable frequency power supply use principle figure.
Fig. 2 is the inner schematic diagram of the utility model high stability variable frequency power supply.
Fig. 3 is the utility model high stability variable frequency power supply general principles figure.
Embodiment
As shown in the figure, the embodiment of the special-purpose high stability variable frequency power supply of electric power overhaul testing equipment metering verification is described below:
Fig. 2 illustrates, and the special-purpose variable frequency power supply of the utility model electric power overhaul testing equipment metering verification comprises current rectifying and wave filtering circuit 2 and inverter circuit cascade; The output of above-mentioned inverter circuit is connected with the primary coil of isolating transformer 8, and the secondary coil of isolating transformer 8 is connected with the signal input part of described low-pressure reactive compensation circuit 10.Mainly the signal output part of the buffer starting circuit of being made up of the time relay 1 is connected with the signal input part of current rectifying and wave filtering circuit 2.
Above-mentioned inverter circuit adopts voltage-regulation voltage-stabilization power inversion circuit 7; Filter circuit 9 is connected with isolating transformer 8 secondary coils; High pressure feedback automatic Regulation voltage stabilizing circuit 17 by high-pressure sampling feedback circuit 18, single-chip microcomputer treatment circuit 19, D/A change-over circuit 20 and PID circuit 21 in turn cascade form;
Above-mentioned PID circuit 21 is made up of three utmost point operational amplifiers, and first utmost point operational amplifier is formed plus and minus calculation amplifying circuit and differential circuit, and second level operational amplifier is formed integrating circuit, and the 3rd utmost point operational amplifier is formed anti-phase summation amplifying circuit;
The input of above-mentioned high-pressure sampling feedback circuit 18 is connected with the high pressure feedback end 24 of step-up transformer;
Above-mentioned single-chip microcomputer SPWM pulse-width modulation automatic voltage regulation circuit 4 is composed as follows: rectification circuit is connected with triangle wave circuit and DDS circuit respectively, the DDS circuit is cascade D/A controller 20, sinusoidal wave circuit 5 and SPWM combiner circuit 16 in turn, and the signal output part of triangle wave circuit is connected with SPWM combiner circuit 16; The signal output part of SPWM combiner circuit 16 is connected with IGBT drive circuit 6 signal input parts, and the signal output part of IGBT drive circuit 6 is connected with voltage-regulation voltage-stabilization power inversion circuit 7; The signal output part of above-mentioned PID circuit 21 is connected with SPWM combiner circuit 16 signal input parts.
The signal input part of low pressure feedback circuit 3 is connected with the signal output part of filter circuit 9, and the signal output part of low pressure feedback circuit 3 is connected with the PID controller, and the PID controller is connected with D/A controller 20.
Overheating detection circuit 23 is connected with protective circuit 22.
Also has the measurement display circuit: because low pressure feedback circuit 3 connects to show the display circuit of low voltage voltage measurement data, frequency measurement data and low-tension current measurement data and is connected with the high-pressure sampling feedback circuit to show that another display circuit of high voltage measuring data forms.
As shown in Figure 2,220V(or 380V) alternating voltage through slow-start circuit 1 after, become the adjustable direct current of voltage through behind the current rectifying and wave filtering circuit 2, this direct current is delivered to isolating transformer 8 after voltage-regulation voltage-stabilization power inversion circuit 7 is reverse into alternating current with direct voltage, thereby makes input power supply and output major loop carry out electrical isolation; And use filter circuit 9 to export sine wave AC voltage and low-pressure reactive compensation circuit 10 stable, little distortion and improve the compensation power of output and improve output power factor.Fig. 1 illustrates, the high-tension electricity of the high stability that the verification of the secondary output power transmission and transformation of step-up transformer repair based on condition of component testing equipment is required.
During high stability variable frequency power supply energising work; the input power supply is by soft-start circuit 1 control; high-power pressure regulation inversion module in the voltage-regulation voltage-stabilization power inversion circuit 7 is carried out time slack to be started; to protect high-power pressure regulation inversion module because of the charge effects of big capacity storage capacitor; (soft-start circuit is control and the delay function of a complexity in the components and parts damage that the impulse current that the very big impulse current of meeting appearance causes in the system causes; use many relays and logic controller, the function of realization is similar relay).
Voltage-regulation voltage-stabilization power inversion circuit 7 carries out work as follows: the single-chip microcomputer treatment circuit is according to the output of the feedback quantity control D/A change-over circuit of sampling low pressure feedback circuit 3, thereby the output voltage amplitude of voltage-regulation voltage-stabilization power inversion circuit 7 is adjusted in the output of this output and oscillating circuit jointly through SPWM combiner circuit 16 synthetic quantities control IGBT drive circuit, thereby regulated output voltage.Therefore when the output voltage of single-chip microcomputer processing circuit controls D/A change-over circuit is also constantly adjusted by zero progressively increase, the high pressure of output also progressively increases by zero and constantly adjusts, single-chip microcomputer is realized the control of inverter bridge IGBT device through software program programming realization SPWM modulating wave, control to realize controlling with the sampled voltage ratio size of duty ratio by low pressure feedback sample voltage by PID, after the SPWM signal is delivered to bridge inverter main circuit (being the voltage-regulation voltage-stabilization power inversion circuit) through the IGBT drive circuit adjust the size of voltage and realize voltage stabilizing.
As shown in Figure 3: high-pressure sampling feedback circuit 18 signals of this high pressure feedback automatic Regulation voltage stabilizing circuit 17 are taken from the high pressure feedback of the tandem change of the utility model outside; thereby thereby adjust the output voltage amplitude of voltage-regulation voltage-stabilization power inversion circuit 7 to control the IGBT drive circuit through high-pressure sampling feedback circuit 18, single-chip microcomputer treatment circuit 19, D/A change-over circuit 20, PID circuit 21, protective circuit 22 and overheated detection 23 etc. to the SPWM combiner circuit 16 control synthetic quantities that are connected successively, thereby regulated output voltage.The height of the voltage that single-chip microcomputer treatment circuit 19 receives from sampling feedback circuit and step-up transformer output is pressed into the fixed proportion relation, the single-chip microcomputer treatment circuit is input to digital voltage value in the D/A change-over circuit 20 according to the voltage control that receives, this digital voltage value is converted to corresponding aanalogvoltage by D/A change-over circuit 20 and inputs to PID circuit 21, PID circuit 21 is made up of three-stage operational amplifier, first order amplifier is formed plus and minus calculation amplifying circuit and differential circuit, this amplifier will be amplified from the voltage signal of D/A change-over circuit 20 outputs, and from its PID circuit 21 outputs; Input voltage from sample circuit is imported from the inverting input of this amplifier, forms degree of depth negative feedback, and its effect is to make the output voltage of output pin more stable; Second level amplifier is formed integrating circuit, and its effect is to eliminate self-oscillation and remove ripple, eliminates interference signal simultaneously, makes from the voltage signal of this chip output pin output more steady; Third level amplifier is anti-phase summation amplifying circuit, its effect is that signal and a direct voltage that second level amplifier is come are superposeed, the size of this direct voltage is sent into galvanic size by potentiometer and is regulated, and signal and direct voltage stack are played the effect of adjusting zero-bit.
Shown in Fig. 3 high stability variable frequency power supply general principles figure: high-pressure sampling feedback circuit 18 feeds back 24 from high pressure shown in Figure 1 and obtains described sampling input voltage, this voltage orders about the lumination of light emitting diode of optocoupler integrated circuit 2GO1 (among Fig. 3, also has optocoupler integrated circuit 2GO1 between D/A change-over circuit 20 and the PID circuit 21), the size of sampling input voltage has determined the size of luminous quantity, receives the back and convert voltage signal to through photosensitive tube to enter SPWM combiner circuit 16 and feed back to form high pressure.Therefore, by adopting above-mentioned Automatic Regulation Control loop, the output voltage amplitude of control rectification circuit that can be stable reaches automatically and stable purpose of boosting.
Deliver to the PID circuit through above-described high and low pressure twin-stage feedback and with feedback signal, again by the D/A controller, by the control of single-chip microcomputer through software program programming realization SPWM modulating wave realization inverter bridge IGBT device, control duty ratio by feedback voltage and sampled voltage ratio and realize voltage stabilizing again.Have that automatic voltage regulation, regulating frequency are wide, output voltage work adjustable extent big, high efficiency, characteristics such as circuit is succinct and interference free performance is good.
IGBT (Insulated Gate Bipolar Transistor), insulated gate bipolar transistor, by the compound full-control type voltage driven type power semiconductor that BJT (double pole triode) and MOS (insulating gate type field effect tube) form, have the advantage of low conduction voltage drop two aspects of the high input impedance of MOSFET and GTR concurrently.The GTR saturation pressure reduces, and current carrying density is big, but drive current is bigger; The MOSFET driving power is very little, and switching speed is fast, but conduction voltage drop is big, and current carrying density is little.IGBT combines the advantage of above two kinds of devices, and the little and saturation pressure of driving power reduces.Be fit to very much to be applied to direct voltage and be fields such as 600V and above converter system such as alternating current machine, frequency converter, Switching Power Supply, lighting circuit, traction transmission.
DDS is a kind of frequency synthesizer of total digitalization, is made of phase accumulator, waveform ROM, D/A converter and low pass filter.After clock frequency was given, output signal frequency depended on frequency control word, and frequency resolution depends on the accumulator figure place, and phase resolution depends on the address wire figure place of ROM, and the amplitude quantizing noise depends on data bit word length and the D/A converter figure place of ROM.
SPWM (Sinusoidal PWM) method is a kind of comparative maturity, uses PWM method more widely at present.The full name of PWM is Pulse Width Modulation(pulse width modulation), it is the output voltage that recently changes equivalence by the duty that changes the output square wave.Be widely used for the control of motor speed adjusting and valve.
So-called SPWM has changed the modulating pulse mode on the basis of PWM exactly, and the pulse width time duty ratio is arranged by sinusoidal rule, and output waveform can be accomplished sinewave output through suitable filtering like this.It is widely used for dc-to-ac inverter etc.Three-phase SPWM is to use the three-phase output of SPWM simulation civil power, is adopted widely in the frequency converter field.
The PID(proportion integration differentiation) English full name is Proportion Integration Differentiation, and it is a mathematics physical term.
The industrial automation level has become an important symbol weighing all trades and professions modernization level at present.Simultaneously, classic control theory, modern control theory and Intelligent Control Theory three phases have also been experienced in the development of control theory.At present, PID control and controller thereof or intelligent PID controller (instrument) are a lot, and product has obtained widely using in engineering reality, and the automatic adjustment of PID controller parameter is to realize by intellectuality adjustment or self-correcting, adaptive algorithm.The pressure, temperature, flow, the fluid level controller that utilize PID control to realize are arranged, can realize the Programmable Logic Controller (PLC) of pid control function, can realize PC system of PID control etc. in addition.Programmable Logic Controller (PLC) is to utilize its closed-loop control module to realize PID control, and Programmable Logic Controller (PLC) can directly link to each other with ControlNet, as the PLC-5 of Rockwell etc.Can realize the controller of pid control function in addition, as the Logix product line of Rockwell, it can directly link to each other with ControlNet, utilizes network to realize its remote control function.

Claims (6)

1. an electric power overhaul testing equipment measures the special-purpose high stability variable frequency power supply of verification, comprise, change alternating current into galvanic current rectifying and wave filtering circuit (2), direct current is changed into the inverter circuit of alternating current, low-pressure reactive compensation circuit (10), it is characterized in that described current rectifying and wave filtering circuit (2) and described inverter circuit cascade; Also have isolating transformer (8) and step-up transformer;
The output of described inverter circuit is connected with the primary coil of isolating transformer (8), and the secondary coil of isolating transformer (8) is connected with the signal input part of described low-pressure reactive compensation circuit (10).
2. the special-purpose high stability variable frequency power supply of a kind of electric power overhaul testing equipment metering verification according to claim 1 is characterized in that also having the buffer starting circuit of mainly being made up of the time relay (1); The signal output part of buffer starting circuit (1) is connected with the signal input part of described current rectifying and wave filtering circuit (2).
3. according to the special-purpose high stability variable frequency power supply of the described a kind of electric power overhaul testing equipment metering verification of claim 2, it is characterized in that described inverter circuit is voltage-regulation voltage-stabilization power inversion circuit (7); Also has filter circuit (9), low pressure feedback circuit (3), single-chip microcomputer SPWM pulse-width modulation automatic voltage regulation circuit (4), high pressure feedback automatic Regulation voltage stabilizing circuit (17) and IGBT drive circuit (6); Filter circuit (9) is connected with isolating transformer (8) secondary coil; High pressure feedback automatic Regulation voltage stabilizing circuit (17) by high-pressure sampling feedback circuit (18), single-chip microcomputer treatment circuit (19), D/A change-over circuit (20) and PID circuit (21) in turn cascade form;
Above-mentioned PID circuit (21) is made up of three utmost point operational amplifiers, and first utmost point operational amplifier is formed plus and minus calculation amplifying circuit and differential circuit, and second level operational amplifier is formed integrating circuit, and the 3rd utmost point operational amplifier is formed anti-phase summation amplifying circuit;
The input of above-mentioned high-pressure sampling feedback circuit (18) is connected with the high pressure feedback end (24) of step-up transformer;
Above-mentioned single-chip microcomputer SPWM pulse-width modulation automatic voltage regulation circuit (4) is composed as follows: rectification circuit is connected with triangle wave circuit and DDS circuit respectively, the DDS circuit is cascade D/A controller (20), sinusoidal wave circuit (5) and SPWM combiner circuit (16) in turn, and the signal output part of triangle wave circuit is connected with SPWM combiner circuit (16); The signal output part of SPWM combiner circuit (16) is connected with IGBT drive circuit (6) signal input part, and the signal output part of IGBT drive circuit (6) is connected with voltage-regulation voltage-stabilization power inversion circuit (7); The signal output part of above-mentioned PID circuit (21) is connected with SPWM combiner circuit (16) signal input part.
4. according to the special-purpose high stability variable frequency power supply of the described a kind of electric power overhaul testing equipment metering verification of claim 3, it is characterized in that also having low pressure feedback circuit (3) and PID controller; The signal input part of low pressure feedback circuit (3) is connected with the signal output part of described filter circuit (9), and the signal output part of low pressure feedback circuit (3) is connected with the PID controller, and the PID controller is connected with D/A controller (20).
5. according to the special-purpose high stability variable frequency power supply of the described a kind of electric power overhaul testing equipment metering verification of claim 4, it is characterized in that also having with overheating detection circuit (23) and the protective circuit (22) of making isolating transformer (8) is carried out temperature monitoring; Overheating detection circuit (23) is connected with protective circuit (22).
6. according to the special-purpose high stability variable frequency power supply of the described a kind of electric power overhaul testing equipment metering verification of claim 5, it is characterized in that also having the measurement display circuit: because low pressure feedback circuit (3) connects with the display circuit that shows low voltage voltage measurement data, frequency measurement data and low-tension current measurement data and another display circuit composition that is connected to show the high voltage measuring data with the high-pressure sampling feedback circuit.
CN 201320067088 2013-02-05 2013-02-05 High stability frequency conversion power supply specially used for power maintenance test equipment metering verification Withdrawn - After Issue CN203219186U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103124141A (en) * 2013-02-05 2013-05-29 四川电力科学研究院 Special high-stability variable frequency power supply for measuring and checking power maintenance testing device
CN103812354A (en) * 2014-02-24 2014-05-21 苏州科技学院 Broadband strong current generator power supply
CN104578819A (en) * 2014-12-19 2015-04-29 中国石油天然气集团公司 Underwater exploration intermediate-frequency deck power source and electromagnetic exploration system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103124141A (en) * 2013-02-05 2013-05-29 四川电力科学研究院 Special high-stability variable frequency power supply for measuring and checking power maintenance testing device
CN103124141B (en) * 2013-02-05 2016-07-06 国网四川省电力公司电力科学研究院 A kind of electric power overhaul testing equipment metering verifies special high stability variable-frequency power sources
CN103812354A (en) * 2014-02-24 2014-05-21 苏州科技学院 Broadband strong current generator power supply
CN104578819A (en) * 2014-12-19 2015-04-29 中国石油天然气集团公司 Underwater exploration intermediate-frequency deck power source and electromagnetic exploration system
CN104578819B (en) * 2014-12-19 2017-05-10 中国石油天然气集团公司 Underwater exploration intermediate-frequency deck power source and electromagnetic exploration system

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C56 Change in the name or address of the patentee

Owner name: ELECTRIC POWER RESEARCH INSTITUTE, STATE GRID SICH

Free format text: FORMER NAME: SICHUAN ELECTRIC POWER RESEARCH INSTITUTE

CP03 Change of name, title or address

Address after: Tsing Hua Road Qingyang District of Chengdu City, Sichuan Province, No. 24 610072

Patentee after: Electric Power Sciences Research Institute of Sichuan Electric Power Corporation

Patentee after: State Grid Corporation of China

Address before: Tsing Hua Road Qingyang District of Chengdu City, Sichuan Province, No. 24 610071

Patentee before: Sichuan Electric power Research Institute

Patentee before: State Grid Corporation of China

C25 Abandonment of patent right or utility model to avoid double patenting
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Granted publication date: 20130925

Effective date of abandoning: 20160706