CN103731051A - High-power numerical control direct current power supply - Google Patents
High-power numerical control direct current power supply Download PDFInfo
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- CN103731051A CN103731051A CN201410030587.0A CN201410030587A CN103731051A CN 103731051 A CN103731051 A CN 103731051A CN 201410030587 A CN201410030587 A CN 201410030587A CN 103731051 A CN103731051 A CN 103731051A
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Abstract
The invention discloses a high-power numerical control direct current power supply suitable for debugging and testing of a high-power electric automobile motor. The power supply comprises at least ten numerical control direct current power supply single bodies which are sequentially connected in series, a control panel, a Hall current sensor and a Hall voltage sensor. Each power supply single body comprises a three-phase bridge rectifying unit, an electromagnetic interference (EMI) filtering unit, a control unit, a relay and a bypass negative temperature coefficient thermistor (NTC) unit and a direct current conversion unit. The control panel comprises a single chip microcomputer and a display screen, keys, a rotating encoder, an RS485 communication port, a current sensor port and a voltage sensor port which are connected with the single chip microcomputer. The communication port is connected with the power supply single bodies, and the current sensor port and the voltage sensor port are connected with the current sensor and the voltage sensor respectively. Current value and voltage value are set and displayed through the control panel to achieve numerical control direct current output. The power supply is high in output power and control accuracy, good in reliability, small in device size, reliable in isolation, convenient to operate and low in manufacture cost.
Description
Technical field
The present invention relates to a kind of high-power numerical control DC power supply, be specially and be applicable to the debugging of high-power electric electric motor of automobile and test required DC power supply, belong to electric power system inversion and commutation technique field.
Background technology
Existing high-power DC power supply is widely used in industry and civil area, and the scheme that realizes at present high-power DC power supply mainly contains two kinds, and a kind of controllable silicon that adopts carries out controlled rectification control, and another adopts inverter circuit to carry out voltage stabilizing control.And the control mode of these two kinds of circuit generally adopts analog form to control.The full name of IGBT is igbt, it integrates the two advantage of field effect transistor MOSFET and power transistor GTR, have that input impedance is high, speed is fast, Heat stability is good and the simple feature of drive circuit, also has advantages of that low, the withstand voltage height of on state voltage and output current are large simultaneously.
Have the AC power of intermediate dc link to have the basic application of two classes: the one, VVVF transformation, variable frequency alternating current power source are powered to alternating current motor, realize alternating current motor rotating speed, torque, turn to control.Another is CVCF constant voltage, constant frequency AC source, and for the AC load power supply that power supply quality is had relatively high expectations, the ac uninterrupted power supply UPS being now used widely is exactly a typical application example.
This high-power numerical control DC power supply main circuit adopts and controls with digital signal processor, and the secondary rectification circuit of the inversion that it is core that power supply single circuit adopts with IGBT module and power rectifier diode is realized.According to retrieval, the current domestic this numerical control DC power supply that also do not occur, the also not patent application identical with the present invention.
Summary of the invention
The object of the invention is the problem proposing for background technology, a kind of high-power numerical control DC power supply is disclosed, by the numerical control DC power supply series connection of ten relatively low output voltages of power supply single, and by real-time measurement and the control of control panel and electric current, voltage sensor, realization is compared with the high-power numerical control DC power supply of high output voltage, and described control panel also can carry out setting and the demonstration of parameter.The power output of numerical control DC power supply of the present invention is large, and control precision is high, good reliability.
Technical scheme of the present invention is: a kind of high-power numerical control DC power supply, comprises numerical control direct current power supply single, control panel, Hall current sensor and Hall voltage transducer; Described power supply single has at least ten, and each power supply single comprises three-phase bridge rectification unit, EMI filter unit, control unit, relay and bypass NTC resistance unit and DC converting unit; It is characterized in that: the ac input end of described each power supply single is connected in parallel, the DC output end of each power supply single is connected in series successively; Described Hall current sensor is connected in the total output loop of direct current, and Hall voltage transducer is connected in parallel in the total output loop of direct current; Described control panel comprises single-chip microcomputer, the display screen, button, rotary encoder, RS485 communication interface, current sensor interface and the voltage sensor interface that are connected with described single-chip microcomputer respectively in addition; Described RS485 communication interface is connected to respectively the control unit of each DC power supply monomer, and current sensor interface is connected with described Hall current sensor output signal, and voltage sensor interface is connected with described Hall voltage sensor output signal.
A kind of high-power numerical control DC power supply as above, it is characterized in that: the electromagnetic interface filter in described power supply single is a kind of low pass filter being comprised of inductance and electric capacity, described relay and bypass NTC resistance unit are negative tempperature coefficient thermistor NTC and the relay contacts of connecting between three-phase bridge rectification unit and DC converting unit; Powered on moment bypass NTC resistance during work is in on-state, and after powering on, bypass NTC resistance is by relay short circuit.
A kind of high-power numerical control DC power supply as above, is characterized in that: the DC converting unit in described power supply single comprises power switch pipe IGBT, high frequency transformer, fast-recovery commutation diode, filter inductance and filter capacitor; Four power switch pipe IGBT that become that brachium pontis shape connects and high frequency transformer composition inverter circuit, variable-frequency transformer is exported and is connected to single-phase bridge fast-recovery commutation diode rectification circuit, is connected to filter inductance and filtering capacitor.
Operation principle of the present invention is:
Power supply single adopts inverting to realize the transformation of AC380V to DC70V, first AC380 is first obtained to level and smooth direct current through three-phase bridge rectification filtering, then by bridge type inverse, obtain the alternating current of 20khz, by fast recovery diode rectification and through the filtering of inductance and electric capacity, obtain the DC power supply that DC70 lies prostrate.The startup of each power supply single, close, output current magnitude of voltage sends instruction to the control unit nucleus module DSPIC30F2010 on power supply single by control panel by RS485 communication interface, by this this power supply single of nucleus module control, worked, and pass through this nucleus module the real-time voltage value of oneself, current value, temperature feedback returns PIC18F4520, for control panel inspection correction;
Control panel is take single-chip microcomputer PIC18F4520 as control core, the parameter of receiving matrix keyboard and digital encoder input, general assignment is divided equally, be about to the corresponding parameter that is sent to master control core of parameter of panel input power, be processed into the 1/10 corresponding parameter that should be sent to each power supply single of the parameter of panel input power, by RS485 communication interface, realize and communicating by letter with power supply single, receive the signal of Hall voltage transducer and Hall current sensor input, and show on display screen.
Its invention beneficial effect is: can carry out high-precision voltage stabilizing control, can be good at meeting the requirement of technical grade.The antijamming capability of device is strong, and long service life can be applicable to need the application scenario of frequent switch.Equipment volume is little, and isolation is reliable, easy to operate, low cost of manufacture.
Accompanying drawing explanation
The annexation schematic diagram of the main circuit that accompanying drawing 1 is high-power numerical control power supply of the present invention;
Accompanying drawing 2 is high-power numerical control DC power supply monomer connection diagram of the present invention;
Accompanying drawing 3 is high-power numerical control DC power control panel schematic diagram;
The circuit theory diagrams that accompanying drawing 4 is electromagnetic interface filter;
Embodiment
Below in conjunction with accompanying drawing, embodiments of the present invention is further illustrated:
As shown in accompanying drawing 1～2, high-power numerical control power supply of the present invention be input as three-phase AC380V/50Hz power supply.In Fig. 1, the total output capacity of power supply is DC700V/500A, DC power supply monomer 1#～power supply single 10# is 10 separate power supply singles, the input parallel connection of 10 power supply singles, DC output end is connected successively, and each power supply single output capacity is DC70V/500A.Each power supply single has defencive function and voltage stabilizing function separately, and provides RS485 communication interface.Between these 10 power supply singles and control panel, adopt RS485 communication line to communicate, control panel receives the parameter of keyboard input, and sending each power supply single to, control panel receives the power data that power supply single transmission is returned, and shows on the display screen on panel.Control panel receives output voltage and the total current signal of Hall current sensor and the detection of Hall voltage transducer, and shows on display screen.
As shown in Fig. 2, Fig. 5, power supply single 1#～power supply single 10# adopts inverting to realize the transformation of AC380V to DC70V, in Fig. 2, AC380 first obtains level and smooth direct current through three-phase bridge rectification filtering, then by bridge type inverse, obtain the alternating current of 20khz, by the filtering of fast recovery diode rectification process inductance and electric capacity, obtain the DC power supply of DC70V.
Be illustrated in figure 3 the implementation of control panel, control panel is take single-chip microcomputer PIC18F4520 as control core, the parameter of receiving matrix keyboard and rotary encoder input, by RS485 communication interface and each power supply single, realize the signal of communicating by letter, receive Hall voltage transducer and Hall current sensor input, and show on display screen.
In Fig. 1 current sensor 12 be employing+15V and-the closed loop Hall current sensor of 15V power supply, range is 0～600A, has the good linearity in range ability, can meet control precision, has good reliability.
Voltage sensor 13 in Fig. 1 be employing+15V and-the closed loop Hall voltage transducer of 15V power supply, range is 0～1000V, has the good linearity in range ability, can meet control precision, has good reliability.
Fig. 3 is the schematic diagram of control panel, control panel receiving matrix keyboard (button 1#～button 4#) and rotary encoder are inputted the parameter of required power supply, then this parameter sends master control core PIC18F4520 to through conversion, master control core is processed the control core DSPIC30F2010 that data is sent to each power supply single through processing, last power supply single is started working, and the real-time voltage value of oneself, current value, temperature feedback returns master control core, for master control core, checks.
It is mainly that general assignment is divided equally that the processing of above-mentioned master control core is processed, be about to the corresponding parameter that is sent to master control core of parameter of control panel input power, be processed into the 1/10 corresponding parameter that should be sent to each power supply single of the parameter of panel input power.
The mode that transmits data is to communicate by letter by RS485, and first main control chip PIC18F4520 obtains the hardware address Add of power supply single control chip DSPIC30F2010 by RS485 communication interface, and then both sides carry out protocol negotiation, and last both sides communicate.
As shown in Figure 2, the data that power supply single transmits to control core gather line 5,6,7 by power supply single control circuit and accept respectively voltage after the AD conversion of each power supply single DSPIC30F2010 inside, current signal, also have the measured value of temperature sensor.Gather each power supply single temperature, be to damage power supply single in order to prevent power supply single excess Temperature, concrete control is to exceed 80 ℃ once gather the power supply single temperature of returning, main control chip PIC18F4520 sends equipment stop signal, and equipment is quit work immediately.
Master control core is except monitoring each power supply single real-time voltage, current value, total output voltage and the electric current of system that the Hall voltage transducer that can also pass through and Hall current sensor detect.
The control core of main circuit is not only divided equally general assignment, makes the workload of each power supply single almost identical, also monitors the temperature of each power supply single, and ten power supply single parameters are consistent, are conducive to extend greatly lifetime of system.
In Fig. 2, high-power numerical control DC power supply monomer divides 3 explanations:
(1) the direct voltage of power supply single produces circuit working mode: three-phase AC380V, first pass through electromagnetic interface filter, then pass through three-phase bridge rectifier circuit, pass through again the inhibition surge circuit of tape relay bypass NTC resistance, finally by thering is the combined full-bridge direct current translation circuit output of the DC/AC-AC/DC direct current of interstage exchange link transformer isolation.
Electromagnetic interface filter is a kind of low pass filter being comprised of inductance and electric capacity, and it can allow the useful signal of low frequency pass through smoothly, and High-frequency Interference is had to inhibitory action.The structure of the electromagnetic interface filter that this power supply is used is as Fig. 4.Power line is to disturb the main path that imports equipment into and spread out of equipment, by power line, the interference of electrical network can be imported equipment into, the normal work of jamming equipment, the interference that same equipment produces also may be passed on electrical network by power line, disturbs the normal work of other equipment.And disturb like this what this power supply was disturbed, it is mainly common mode disturbances.L in Fig. 4 is exactly common mode inductance, and it is that two of coilings are around on the contrary on same magnet ring, and the coil that the number of turn is identical forms.It has inhibitory action to common mode disturbances.The insertion loss that records this electromagnetic interface filter through experiment is 60db.Electromagnetic interface filter Main Function is the interference to power supply single of the high-frequency impulse of the extraneous electrical network of filtering, also plays and reduces power supply single electromagnetic interference to external world itself simultaneously.
The inhibition surge circuit of tape relay bypass NTC resistance.The restriction effective method of surge current that powers on is that the input side of rectifier adds a negative tempperature coefficient thermistor NTC, utilize negative tempperature coefficient thermistor to there is higher resistance value under normal temperature state and limit the surge current that powers on, after powering on, because NTC current flowing generates heat, make its resistance value reduce to reduce the loss on NTC.And directly add the shortcoming of NTC, the one, circuit is normal start after, the energy that NTC consumes is that we are unwanted; The 2nd, the frequently circuit of switch NTC thermistor, when down circuitry, NTC thermistor must return to normal temperature high-impedance state completely from high temperature low resistive state just can reach the Surge suppression effect equal with the last time.This recovery needs certain hour.Consider, we have added relay when design.Power circuit powered on moment, NTC thermistor is by Inrush current restraining to suitable level, power circuit obtains electric normal work afterwards, now relay coil from load circuit obtain electric action, NTC thermistor is cut from operating circuit.Like this, the only work when power circuit starts of NTC thermistor, and when power circuit is normally worked, be place in circuit not.So both extend the useful life of NTC thermistor, guaranteed again that it had sufficient cooling time, and can be applicable to need the application scenario of frequent switch.
Three-phase AC380V voltage after filtering with rectification module rectification, obtain the direct voltage of about 540V.As seen from Figure 5, this direct voltage is applied on the inverter being comprised of power switch pipe IGBT and high frequency transformer TI.Four arms of VT1, VT2, VT3, VT4 composition bridge in IGBT, high frequency transformer TI is connected in the middle of them, the break-make alternately with pulse mode excitation that relatively a pair of power switch pipe VTI, the VT3 on brachium pontis and VT2, VT4 are sent by gate driver circuit, DC voltage conversion is become to the high-frequency alternating voltage of 20kHz, the voltage of 70V left and right reduced to about 540V voltage by high frequency transformer simultaneously, finally again by fast
Recovery diode rectification also obtains DC power supply through the filtering of inductance and electric capacity.Electric power main circuit is followed AC-DC-AC-DC form, although this DC power supply has been passed through two stage power conversion, but inverter link main circuit structure is also uncomplicated, control circuit is also simple, and the transformer of interstage exchange link is high frequency transformer, its weight, volume are all little, and the LC filter in circuit is also less.
(2) the protective circuit of power supply single: comprise voltage protection, current protection, temperature protection, gold resistance power consumption protection.
Voltage protection.The design uses ten bit A/D converters of DSPIC30F2010 inside, and it adopts successive approximation register conversion, and conversion speed can reach 500ksps, thereby has higher precision in the situation that guaranteeing conversion speed, and precision can reach 0.1V.When surveying voltage, because tested voltage is higher than the input voltage can bear of DSPIC30F2010AD, so add again divider resistance in circuit.By the voltage transitions of divider resistance, be to want tested voltage, power supply single control core, except real-time transmission magnitude of voltage, during higher than 70V, sends alarm signal at voltage, sends master control core to, by master control core processing, is decided.
Current protection.The sampling resistor of connecting on circuit, by surveying the voltage drop value on sampling resistor, recycling Ohm's law calculates electric current.So, survey electric current and be all converted into survey voltage.The pressure drop of sampling resistor is converted to and wants tested electric current, and power supply single control core, except real-time transmission current value, during higher than 500A, sends alarm signal at electric current, sends master control core to, by master control core processing, is decided.
Temperature protection.Temperature protection refers to utilizes temperature sensor collecting temperature value, then to master control core, transmits data in real time, by master control core processing, is decided.Gather each power supply single temperature, be to damage power supply single in order to prevent power supply single excess Temperature, concrete control is to exceed 80 ℃ once gather the power supply single temperature of returning, main control chip PIC18F4520 sends equipment stop signal, and equipment is quit work immediately.When selecting the riding position of temperature sensor, this power supply is placed on transducer between IGBT module and rectification module, because the high-speed switch of the two causes temperature high compared with other elements, and the high temperature of the two also will make the unstable of circuit and the damage of self.
Gold resistance power consumption protection.This power supply is applicable to debugging and the test of high-power electric electric motor of automobile.So while designing this power supply, consider the operational mode of motor in electric automobile.When motor is when out of service, due to machinery inertial, motor can continue to move a period of time, and motor becomes generator from motor during this period of time, and this part of electric energy of sending out, if do not controlled consumption, will cause damage to circuit.So when designing power supply, add gold resistance to remove to consume this part electric energy in circuit.Gold resistance, shell adopts aluminium alloy (gold aluminum hull) manufacture, and surface has radiating groove; volume small-power is large; high temperature resistant, overload capacity is strong, has weatherability, high accuracy; the low inductive reactance of standard; high stable, strong framework, the good Multiple Combination of its flexibility is selected; be beneficial to mechanical protection, conveniently install and use.The model of the gold resistance in this power supply is 200RJ10W, and circuit assembling structure is that 20 gold resistance are in parallel again after connecting between two.After tested, when system out of service, this gold resistance power consumption circuit can consume most of electric energy, is that motor can be out of service faster.
(3) the control circuit working method of power supply single: the control signal transmitting from master control core acts on power supply single control circuit, first the control core DSPIC30F2010 of power supply single control circuit, processes processing to transmitting control signal, then produces and drives signal (1 in Fig. 2,2,3,4), drive signal to act on successively VT1 in IGBT, VT2, VT3, VT4, finally to from collection signal 5,6,7 information that obtain are processed and are processed into feedback signal, send back master control core.The control power supply of the control circuit of power supply single, by introducing from input side, obtains after transformer.
The processing for the first time of the control core of power supply single control circuit, is also about to control signal processing and is processed into driving signal 1,2,3,4.First, power supply single control core obtains mission bit stream from control signal, then produce PWM ripple, and the driving force of these pwm signals is generally all very little, so will produce the signal of driving force, must add drive circuit.The effect of drive circuit is mainly that the driving signal to being sent by control circuit carries out power amplification, and guarantees certain pulse front edge, rear along steepness, makes it have enough abilities to make IGBT saturation conduction.Meanwhile, drive circuit also plays the electrical isolation effect of control circuit and main circuit and the collection effect of fault-signal.
Referring to Fig. 2 and Fig. 5, drive signal 1,2,3,4 to act on VT1 in IGBT, VT2, VT3, VT4, control the duty ratio of IGBT, i.e. the time that conducting is closed.The type of drive of driving signal has a variety of, and the design's type of drive adopts transformer T1 isolation, and the benefit of doing is like this that isolation is reliable, easy to operate, with low cost.
The processing for the second time of the control core of power supply single control circuit, is also about to collection signal 5,6,7 processing and is processed into feedback signal.Power supply single control circuit is accepted the rear voltage of AD conversion of the DSPIC30F2010 inside of power supply single, electric current, and the measured value of temperature sensor by collection signal 5,6,7.
The control core of high-power numerical control power supply concentrates on control panel, and as shown in Figure 3, control panel is take PIC18F4520CPU as control core, and control panel comprises matrix keyboard, rotary encoder, and LCD display, RS485 communication interface, AD Sampling Interface forms.
In Fig. 1, the implementation of control panel as shown in Figure 3, control panel is take single-chip microcomputer PIC18F4520 as control core, the parameter of receiving matrix keyboard and rotary encoder input, by RS485 communication interface, realize and communicating by letter with power supply single, receive the signal of Hall voltage transducer and Hall current sensor input, and show on display screen.
Button 1# control the starting working of whole system, button 2# control the quitting work of whole system, button 3# for the total output voltage electric current of the system of checking, button 4# for checking each power supply single output voltage electric current and working temperature, the 4# that pushes button again, the information of display power supply monomer 1#; Click for the third time button 4#, just the information of display power supply monomer 2#; Click again button 4#, the just information of display power supply monomer 3#, the rest may be inferred, just can check the information of all power supply single 1#～10#.
The major function of rotary encoder is input power parameter.Concrete operations: the 1# that pushes button, system is started working.The 3# that pushes button, shows the total output voltage electric current of display system on screen, now just can set the magnitude of voltage that will export by rotary encoder.
Voltage sensor employing+15V in Fig. 1 and-the closed loop Hall voltage transducer of 15V power supply, range is 0～1000V, has the good linearity in range ability, can meet control precision, has good reliability.
Current sensor employing+15V in Fig. 1 and-the closed loop Hall current sensor of 15V power supply, range is 0～600A, has the good linearity in range ability, can meet control precision, has good reliability.
The major function of LCD display is the parameter that display setting parameter and power supply single are uploaded.RS485 communication interface completes the function of communicating by letter with power supply single.AD Sampling Interface mainly completes the data acquisition function of output voltage and electric current.
Claims (3)
1. a high-power numerical control DC power supply, comprises numerical control direct current power supply single, control panel, Hall current sensor and Hall voltage transducer; Described power supply single has at least ten, and each power supply single comprises three-phase bridge rectification unit, EMI filter unit, control unit, relay and bypass NTC resistance unit and DC converting unit; It is characterized in that: the ac input end of described each power supply single is connected in parallel, the DC output end of each power supply single is connected in series successively; Described Hall current sensor is connected in the total output loop of direct current, and Hall voltage transducer is connected in parallel in the total output loop of direct current; Described control panel comprises single-chip microcomputer, the display screen, button, rotary encoder, RS485 communication interface, current sensor interface and the voltage sensor interface that are connected with described single-chip microcomputer respectively in addition; Described RS485 communication interface is connected to respectively the control unit of each DC power supply monomer, and current sensor interface is connected with described Hall current sensor output signal, and voltage sensor interface is connected with described Hall voltage sensor output signal.
2. a kind of high-power numerical control DC power supply as claimed in claim 1, it is characterized in that: the electromagnetic interface filter in described power supply single is a kind of low pass filter being comprised of inductance and electric capacity, described relay and bypass NTC resistance unit are negative tempperature coefficient thermistor NTC and the relay contacts of connecting between three-phase bridge rectification unit and DC converting unit; Powered on moment bypass NTC resistance during work is in on-state, and after powering on, bypass NTC resistance is by relay short circuit.
3. a kind of high-power numerical control DC power supply as claimed in claim 1 or 2, is characterized in that: the DC converting unit in described power supply single comprises power switch pipe IGBT, high frequency transformer, fast-recovery commutation diode, filter inductance and filter capacitor; Four power switch pipe IGBT that become that brachium pontis shape connects and high frequency transformer composition inverter circuit, variable-frequency transformer is exported and is connected to single-phase bridge fast-recovery commutation diode rectification circuit, is connected to filter inductance and filtering capacitor.
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| CN104052105A (en) * | 2014-04-18 | 2014-09-17 | 河南速达电动汽车科技有限公司 | Rapid charging system for lithium battery of electric vehicle |
| CN107179478A (en) * | 2017-06-09 | 2017-09-19 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of submarine cable parameter detecting system |
| CN107181401A (en) * | 2017-06-09 | 2017-09-19 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of anti-jamming power-supply for submarine cable parameter detecting |
| CN107202937A (en) * | 2017-06-09 | 2017-09-26 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of submarine cable parameter detection method |
| CN107959283A (en) * | 2017-11-30 | 2018-04-24 | 宁夏共享模具有限公司 | 3D printing head Driver Card bistable state closed-loop direct electric power system and method |
| CN108964246A (en) * | 2018-07-25 | 2018-12-07 | 郑州云海信息技术有限公司 | A kind of method for switching main and standby power supplies and system of test equipment |
| CN110165873A (en) * | 2019-05-29 | 2019-08-23 | 珠海格力电器股份有限公司 | Drive circuit, air conditioner drive system, air conditioner, control method and controller |
| CN115236504A (en) * | 2022-09-26 | 2022-10-25 | 广东电网有限责任公司佛山供电局 | Intelligent quick calibration device for relay |
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| CN104052105A (en) * | 2014-04-18 | 2014-09-17 | 河南速达电动汽车科技有限公司 | Rapid charging system for lithium battery of electric vehicle |
| CN107179478A (en) * | 2017-06-09 | 2017-09-19 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of submarine cable parameter detecting system |
| CN107181401A (en) * | 2017-06-09 | 2017-09-19 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of anti-jamming power-supply for submarine cable parameter detecting |
| CN107202937A (en) * | 2017-06-09 | 2017-09-26 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of submarine cable parameter detection method |
| CN107181401B (en) * | 2017-06-09 | 2020-10-20 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Anti-interference power supply for submarine cable parameter detection |
| CN107959283A (en) * | 2017-11-30 | 2018-04-24 | 宁夏共享模具有限公司 | 3D printing head Driver Card bistable state closed-loop direct electric power system and method |
| CN108964246A (en) * | 2018-07-25 | 2018-12-07 | 郑州云海信息技术有限公司 | A kind of method for switching main and standby power supplies and system of test equipment |
| CN108964246B (en) * | 2018-07-25 | 2021-11-23 | 郑州云海信息技术有限公司 | Main/standby power supply switching method and system of test equipment |
| CN110165873A (en) * | 2019-05-29 | 2019-08-23 | 珠海格力电器股份有限公司 | Drive circuit, air conditioner drive system, air conditioner, control method and controller |
| CN115236504A (en) * | 2022-09-26 | 2022-10-25 | 广东电网有限责任公司佛山供电局 | Intelligent quick calibration device for relay |
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Application publication date: 20140416 |
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