CN2221838Y - Thyristor intermediate-frequency power supply electrics device - Google Patents
Thyristor intermediate-frequency power supply electrics device Download PDFInfo
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- CN2221838Y CN2221838Y CN 94246734 CN94246734U CN2221838Y CN 2221838 Y CN2221838 Y CN 2221838Y CN 94246734 CN94246734 CN 94246734 CN 94246734 U CN94246734 U CN 94246734U CN 2221838 Y CN2221838 Y CN 2221838Y
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Abstract
The utility model relates to a controlled silicon intermediate-frequency device which is applied to the induction heating of metal. The utility model is composed of a main loop, a control loop and a protective device. A starting circuit uses an inversion bridge to provide magnetism, and a capacitor switches off the inversion bridge and the controlled silicon in a charging way; thus, the starting rate of the utility model is very high even if the utility model has the heavy load. A diode is used for realizing t <f>switching with non-contact, synchronous signals and a power supply share with a small transformer together, and a light-emitting diode is used for displaying overcurrent and overvoltage. The structure of a control circuit only uses a circuit board with the size of 12*20 cm. The utility model has the advantages of few peripheral element connecting lines, excellent performance, high reliability, easy repair, faultless continuous operation for months, and strong anti-interference ability. The utility model is suitable for a site having high power and strong interference.
Description
Thyristor intermediate frequency electric source is to be core with the controllable silicon, becomes a kind of static frequency-conversion device of three-phase main-frequency alternating current into single-phase medium frequency alternating current.
First silicon controlled embryo was born in U.S. telephone bell company laboratory in 1956 in the world.Afterwards, greatly about sixties end, controllable silicon intermediate frequency device has appearred, in order to replace the intermediate frequency generator group.
Domestic controllable silicon intermediate frequency device technique several years ago, rests on the backward level of discrete component assembling always.In recent years, development was very fast, the circuit of discrete component and integrated circuit integrated application occurred, fully integratedization circuit.The device circuit board, from 10 polyliths drop to several, to one big board-like, used tens of integrated circuits.Various novel circuits, new technology are come out one after another.But the prior art level still has many deficiencies.Repairing problem, how improvement problem of start-up circuit or the like as the complicated difficulty of interference free performance problem, the higher problem of controllable silicon spoilage, line construction, all is to be engaged in this industry design, to make and problem that the people of maintenance perplex for it.
The purpose of this utility model is a kind of thyristor intermediate frequency electric source electric device simple in structure, easy to maintenance of design.
The utility model thyristor intermediate frequency electric source is made up of electric device and chilled water unit.Chilled water unit is continued to use prior art substantially.
The thyristor intermediate frequency electric source electric device is made up of major loop, control loop and protection loop, and its electrical principle is provided by accompanying drawing.Accompanying drawing 1 is the major loop electrical schematic diagram; Accompanying drawing 2 is a major loop control board electrical schematic diagram; Accompanying drawing 3 is relay operation electrical schematic diagram.
One, major loop
Major loop is made up of three phase controlled rectifier circuit, DC filtering circuit, this three part of parallel single-phase inverter circuit.
Three phase controlled rectifier circuit mainly is made up of these six controllable silicons of 1-6SCR.It is under the rectifier control circuit effect, with three-phase main-frequency interchange becoming direct current.
The DC filtering circuit is made up of direct current reactor LD.It becomes level and smooth stable direct current with the pulsating direct current ripple of rectifier bridge output, and output is for half-bridge converter.
LD also has other three effects except filter action:
1. stop midfrequent AC to scurry into common frequency power network.2. inverter bridge is limited the climbing of instantaneous short circuit electric current in the change of current constantly by LD.3. transship, when short circuit, inverter failure, also be to suppress the short circuit current climbing by LD.
The parallel single-phase inverter circuit mainly is made up of four fast controllable silicon of 7-10SCR, hollow coil 4L and load circuit (being composed in parallel by inductor L, capacitor C1, C2).It becomes medium frequency alternating current with dc inverter under the effect of control circuit.
Here adopt the parallel resonance circuit.Reverse frequency depends primarily on the parameter of L, C.
Capacitor has two effects.The one, provide a large amount of reactive currents to induction coil, the 2nd, provide shutoff silicon controlled back-pressure to inverter bridge.
The effect of inductance 4L: 1. capacitor is when inverter bridge controllable silicon to be turn-offed is executed back-pressure, and it is too fast to allow on the electric capacity electric charge can not discharge by 4L, to obtain the long anti-pressure time of executing.2. suppress inversion silicon controlled dI/dt and do not exceed permissible value.When 3. inversion started, the direct voltage that starts on the capacitor C Q was executed back-pressure to inverter bridge controllable silicon to be turn-offed, because the effect of 4L is executed anti-pressure time and prolonged, the convenient startup successfully.
Two, control loop
Control loop mainly is made up of control board and auxiliary element.Control loop is made up of power circuit, rectification triggering circuit, inverter trigger circuit, start-up circuit, adjusting and protective circuit.The main body of control loop is arranged on the control board.Control board is of a size of 120 * 200=240 square centimeter.Establish 25 inputs, output interface on the control board, link by (computer is used) 25 line connectors and corresponding site.Each interface function note is as follows:
Thyristor intermediate frequency electric source control board interface function note (25 line)
(1) output inversion triggering signal is with No. 1 client link of 7MB.
(2) output inversion triggering signal is with No. 2 client links of 8MB.
(3)+20V ,+15V negative terminal and TB three-phase synchronous signal common port link formation " ".
(4) the Uic signal of input inversion self-excitation FM signal is with No. 4 client links of 5LH.
(5) U of input inversion self-excitation FM signal
aSignal is with W6, No. 5 client links of R019 tie-point.
(6) input+15V voltage is with No. 6 client links of the normally opened contact of 3J.
(7) the given phase shift controlling voltage of input is with No. 7 client links of W7.
(8) output by given, regulate the phase shift controlling voltage UK of output after comprehensive, with No. 8 client links of V1 table.
(9) input C phase synchronization signal (AC15V) is with No. 9 client links of TB.
(10) input a phase synchronization signal (AC15V) is with No. 10 client links of TB.
(11) No. 11 client links of input B phase synchronization signal (AC15V) and TB.
(12) output+15V voltage is supplied with usefulness such as Power Regulation, protection demonstration.
(13) output " overcurrent " index signal is with No. 13 client links of " overcurrent " lamp.
(14)-(19) six start pulse signals of output three-phase full-controlled bridge number connect with the corresponding end of 1MB-6MB respectively in regular turn.
(20) input+20V voltage (not voltage stabilizing) is with No. 20 client links of 1ZD.
The sampled signal of (21) input " pressure limiting ", " overvoltage " protection is with No. 21 client links of 2ZD.
(22) input " feedback ", " current limliting ", " overcurrent " protection sampled signal are with No. 22 client links of 3ZD.
(23) input voltage, current sampling signal common port (negative terminal), 23 client links of 2ZD, 3ZD.
(24) input inversion stop, cooling water decompression off signal, with No. 24 client links of 2TA, YJ.
(25) output " overvoltage " index signal is with No. 25 client links of " overvoltage " indicator light.
1, the working power of system: the synchrotrans TB time half of winding of level and by the three-plase half wave rectifier circuit (seeing accompanying drawing 3) that the rectification 4ZD that 3 diodes are formed is constituted has provided+the 20V DC power supply.+ 20V power supply is supplied with rectification triggering circuit and inverter trigger circuit power amplification work electricity consumption.+ 20V power supply is defeated by interface No. 20; in plate after " 7815 " three-terminal regulator block voltage stabilizing; for the working power of the whole controls except that the alternating current operation loop such as rectification triggering circuit, inverter trigger circuit, protective circuit with the protection loop ,+15 stabilized voltage power supplys and+20V not stabilized voltage power supply be total to " ".
2, rectification triggering circuit:
Circuit structure: with module MA is the center, serves as peripheral the support with clamor 1-6MB, triode T1-T6, diode D18-D24, resistance R 6-R23, capacitor C 8-C13 etc. of synchrotrans TB, pulse transforming, has constituted rectification triggering circuit.
Establish the identical circuit of three covers in the MA, they are " crossing the zero-sum polarity detection circuit ", " sawtooth waveforms formation circuit ", " voltage comparator circuit ", " anti-interference lock-in circuit ", " pulse shaping circuit ".Simultaneously, also be provided with unified " constant-current source circuit " and be used to modulate " pulse-generator circuit " of 6 pairs of trigger impulses.
Constitute T type filter network by resistance, electric capacity, to synchronizing signal filtering, filtering interference signals.
Circuit feature: (1) is provided with synchrotrans TB isolates the forceful electric power of synchronizing signal and major loop, synchronizing signal is depressurized to is fit to module MA work.The connection of synchrotrans is Y/Y0-12.Synchrotrans are secondary for being with centre tapped winding, centre cap be synchronizing signal and dc supply altogether " " point, with elementary winding same-phase end output synchronizing signal, the antiphase end is through rectification output+20V power supply.
(2) rectification triggering circuit has designed two efficient circuits and has improved antijamming capability: constitute T type filter network in order to the interference component in the filtering synchronizing signal by RC, inject between " voltage comparator circuit " and pulse shaping circuit simultaneously by " anti-interference lock-in circuit ".
(3) adopt unified constant-current source, the unbalanced degree of each phase pulse is less than ± 2 °.
(4) trigger impulse is " two burst pulse row ".Width is 18 °, 60 ° at interval.
Commutating pulse circuits for triggering operation principle: three-phase synchronous signal a, b, c postpone 30 ° respectively through R6, R8, R10, C12, R18, C12 filtering, after the filtering interfering, again respectively through R7, R8, R13, R14, R19, R20 dividing potential drop.The a phase synchronization signal is sent into the MA12 pin through C9, R11.The b phase synchronization signal is sent into the MA10 pin through C11, R17.The c phase synchronization signal is sent into the MA11 pin through C13, R23.R9, R18, R15, R16, R21, R22 be right respectively+15 dividing potential drops get+7.5V voltage, respectively as MA each synchronously end go into bias voltage of end.
Establish the identical circuit of three covers in the MA, " constant-current source circuit " that also has shared being used to modulate " pulse-generator circuit " of trigger impulse and be used for sawtooth waveforms electric capacity is charged in addition.
Each phase trigger impulse circuit working principle is identical.Describe a phase synchronization signal now separately and enter later process of MA12 pin and operation principle, b, c are identical therewith mutually.
The a phase synchronization signal detects zero crossing and polarity through " zero passage and polarity detection circuit ", and control " sawtooth waveforms formation circuit " is to sawtooth waveforms capacitor discharge, charging.The sawtooth voltage signal U tooth that forms on this electric capacity, and the phase-shifting voltages signal U that comes in through the MA7 pin
K, be sent to " voltage comparator circuit " together.From " voltage comparator circuit " output U tooth and U
KFriendship put signal mutually.The moment that this signal occurs, send out moment of trigger impulse exactly, be the forward position starting point of trigger impulse.
Hand over phase signals to send into " anti-interference lock-in circuit ", send trigger impulse by its control " pulse shaping circuit ".
" pulse-generator circuit " modulated the pulse that " pulse shaping circuit " sent to " pulse shaping circuit " and is modulated into spike train.
The trigger impulse that " pulse shaping circuit " sends drives T6, T3 from 6 pin (+A pulse) of MA and 1 pin (A pulse) output respectively and is transferred to the obligation that all oriented leading oneself 60 ° the pipe of each trigger impulse of 1SCR, 4SCR is sent out " supplements dashes " by 1MB, 4MB again.
" anti-interference lock-in circuit " receiving sawtooth waveforms, phase-shifting voltages U
kThe friendship phase signals after, only send out a signal, up to next zero crossing to " pulse shaping circuit ".Even it is occur interference signal during this, also unaffected.Guaranteed " handing over mutually unique ", improved antijamming capability effectively.
When Uk changed between 0.3V-8V, phase shifting angle changed between 0 °-150 °, and U
kAnd there is linear relationship between phase shifting angle basically, is approximately 20 °/V.Phase shift polarity is being for just, i.e. U
kIncrease, it is big more that a is touched in control.
The 1-6 pin of MA is the trigger impulse output.1 pin--A+C, 2 pin-+C ,-B, 3 pin--B ,+A, 4-+B ,-A, 5 pin--C ,+B, 6 pin-+A ,-C.7 pin-U
kInput, 8 pin-" ", 9 pin-+15V imports 10 pin-b input synchronously, 11 pin-c input synchronously, 12 pin-a input synchronously.
3, inverter trigger circuit:
The structure of a-inverter trigger circuit: by " frequency-tracking and t
fCircuit ", this three part of " pulse shaping circuit ", " pulse power amplifier circuit " constitutes.
" frequency-tracking and t
fCircuit " form by a secondary winding, resistance R 018, R019 potentiometer W6, the capacitor C 14 of module MD, electric current of intermediate frequency instrument transformer 5LH, voltage of intermediate frequency instrument transformer YH.
" pulse shaping circuit " is made of module MC.
" pulse effect circuit " is made up of triode T7, T8, pulse transformer 7MB, 8MB, diode D12, D13, D14.
The feature of b-inverter trigger circuit: (1) for cooperating start-up circuit work, and this circuit just sends four trigger impulses to half-bridge converter adding working power moment, touches four controllable silicons logical simultaneously.(2) constituted t by module MD
fCommutation circuit has realized t
fSwitching oncontacting reveals.(3) capacitor C14 and pulse shaping circuit (being located in the module MC) input is set the 1.4V threshold voltage is set, obtain excellent anti-interference effect.
The operation principle of c-inverter trigger circuit: " frequency-tracking and t
fCircuit " task, be to produce a frequency-tracking, and phase place lags behind Uat in intermediate frequency output voltage U a
fThe new signal Us of time.Us also is a sine wave signal.
The task of pulse shaping circuit is that generation inversion trigger impulse, pulse duration design in 50Us-100Us (microsecond).The forward position starting point of inversion trigger impulse is exactly " zero crossing of Us ".So the work of pulse shaping circuit is to be subjected to " frequency-tracking and t
fCircuit " control.
The task of " pulse power amplifier circuit " is that the inversion trigger impulse from " pulse shaping circuit " is carried out power amplification, is transferred to the inversion controllable silicon by 7MB and 8MB then.Diode D12, D13, D14 are used for absorbing the peak voltage that 7MB, 8MB produce.
Here further set forth Us signal: 5LH-IC forms on MD and R018-U
IcWith Ua from YH, synthetic Us signal in R019, C14 network.Because: 1. Ua with-the Uic frequency is identical, all is sinusoidal wave.In any one half cycle, has only an intersection point.2. Ua is in frequency, when amplitude changes, and-Uic changes too.3.-Ua90 ° of Uic hysteresis.So guaranteed as drawing a conclusion: 1. Us is identical with the Ua frequency.2. Us also is sinusoidal wave.3. the possible maximum angle of the phase lag Ua of Us is less than 90 °, and possible minimum angles is greater than 0 °.4. regulating Ua or adjusting-UIC can both make the angle of Us hysteresis Ua change.5. " frequency-tracking and t
fCircuit " parameter set up after, the time t of Us zero crossing hysteresis Ua zero crossing
fWith substantial constant.Regulate W6, can change t
f
4, inversion start-up circuit: shown in the accompanying drawing 3a: transformer QB, rectifier 1ZD, capacitor CQ have constituted pre-charge circuit, and be negative just down on the last charging polarity of CQ.
Fig. 3 a also shows: by general-purpose relay 2J, 3J A.C. contactor 4J and button 2QA have constituted startup relay program circuit.
When pressing 2QA, 2J gets electric adhesive, and a pair of normally opened contact 2J1 of 2J makes 3J get electric adhesive and self-locking, and the normally opened contact 3J11 of 3J connects inversion and triggers, circuit+15V working power.Inverter trigger circuit is sent four pulses and four controllable silicons of half-bridge converter is touched simultaneously logical, and electric current is cumulative among the direct current reactor LD.(before pressing ZQA, rectifier bridge output places the starting resistor position.) another of 3J break QB normally-closed contact from the AC220V loop.
Another of 2J is to normally opened contact 2J
zMake 4J get electric adhesive, its normally opened contact is applied to the last voltage of CQ on the inverter bridge controllable silicon during 4J adhesive.At this moment to go up polarity of voltage be to have born back-pressure and be turned off to 7SCR and 10SCR to CQ.At this moment 8SCR and 9SCR continue conducting, and electric current is transferred to load circuit immediately because of the shutoff of 7SCR and 10SCR among the LD, and begins to occur signal in YH and 5LH.Add bigger t is arranged when starting
f, start success easily.After starting successfully, t
fReturn to value just often again.
3J and 4J be simultaneously electric, but the 3J sucting speed is always than the fast some millisecond of 4J, this time difference is exactly the pre-magnetizing time of LD.
t
f(inversion triggers pre-set time) contactless switching: module MD constitutes t among Fig. 1
fContactless commutation circuit.MD is made of 10 plastic package diodes, per 5 series connection of joining by both positive and negative polarity, with this two strings series diode reversed polarity parallel connection.
This is to utilize the non-linear principle of diode equivalent resistance to realize t
fSwitch.In the accompanying drawing 1, when the 5LH induction was more weak, the MD equivalent resistance was very big, and Uic is relatively large, t
fAlso bigger.Otherwise the MD equivalent resistance is less, Uic is weakened, t
fAlso less.
Three, Zhuan Zhi protection
(1) AC side and DC side overvoltage protection.This device is with 4 piezo-resistances.Wherein 1Ry-3Ry is used for absorbing the spike overvoltage of the alternate appearance of AC side, and 4Ry is used for absorbing the spike overvoltage that DC side occurs.
(2) exchange the phase fault protection.Three of 1. being serially connected on the three-phase inlet wire are fast molten.The phase fault protective effect is arranged.2. air circuit ZK also is one important overload and short-circuit protection facility.1. and 2. dc-side short-circuit also there is protective effect.3. hollow inductance 1L-3L has the effect that suppresses short circuit current climbing dI/dt and transient short-circuit current peak value, suppresses the effect that intermediate frequency component influences electrical network in addition.
The overcurrent of (3) inversion side and overvoltage protection.The violent change of inversion lateral load, reasons such as overload, startup failure, inverter failure or component wear all can cause inversion side overcurrent or short circuit.Reasons such as the excessive and induction coil cable disconnection of inversion side inversion advance angle can make voltage of intermediate frequency too high.So must carry out overcurrent, overvoltage protection to the inversion side.This device adopts the mode of " drawing inversion " to protect.
1. overcurrent protection principle:
The current sampling signal of 1-3LH is sent into control board 22,23 pin, through C1 filtering after the 3ZD rectification.W1 cooperates D1 in order to set the overcurrent protection operating value.When current signal reaches or during greater than definite value, voltage-stabiliser tube D1 punctures, signal enters 5 pin of MB6 pin MB will export a d. c. voltage signal enters module MA through R24, D18 7 pin.This voltage makes rapid rising of Uk and amplitude limit about 8V.At this moment MA will rectifier and trigger pulse phase shift to 150 ° with output about, fully controlled bridge just enters the active inversion state, the magnetic energy among the LD is presented back common frequency power network.Short circuit current is decayed fast, so device quits work automatically.As restarting, should operate reset switch (turn-offing the control power supply).
2. the action principle of overvoltage protection, water cut-off protection, manual shut-down is the same with the principle of overcurrent protection.
3. current limliting, pressure limiting.The action principle of current limliting, pressure limiting and above-mentioned overcurrent, overvoltage action principle are roughly the same.Its difference is: sampled signal intensity is during greater than set point, and the output signal of MB rises, moves behind the trigger impulse with the pro rata Uk of making of sampled signal, and direct current output descends, so electric current (or voltage of intermediate frequency) also descends.
4. negative feedback.The negative feedback principle is followed: " current limliting " " pressure limiting " is similar, and its difference is that the former must start to control on set point, and the latter does not have this restriction.
The effect that is located at 5 0.5W solid potentiometers on the control board is: W1-over-current adjusting, W2-current limliting are adjusted, the W3-negative feedback is adjusted, the W4-pressure limiting is adjusted, the W5-overvoltage is adjusted.
(4) silicon controlled protection.Device all is provided with the RC protection to each controllable silicon.Be used for absorbing peak voltage, suppress dV/dt.Device is with magnet ring (seeing dashed rectangle among Fig. 1) to each controllable silicon, with inhibition dI/dt is arranged.The inversion circuit string has 4L (the hollow coil of wire) that the effect that suppresses dI/dt is also arranged.
(5) anti-misoperation and start-up circuit
High sensitive relay 5T, rectifier 5ZD and 7RD etc. constitute the anti-misoperation protective circuit.
This device is in operation and forbids by startup power supply " pass " and " inversion startup " button, otherwise may damage device.Be provided with above-mentioned " anti-misoperation " circuit for this reason.
During device busy, voltage of intermediate frequency must be arranged, after 5ZD rectification, CN filtering, make the 5J adhesive from YH time grade voltage of intermediate frequency, its normally opened contact 511 is attempted by on the 1TA, and 1J can power down yet even mistake is pressed 1TA control power supply relay.The normally-closed contact 5J2 of 5J is serially connected on the inversion starting relay 2J loop, so even mistake is pressed 2QA, 2J can not move yet.7RD is serially connected in and starts on the capacitor C Q, after preventing to start button 2QA by inversion, fail to discharge, and 4J is because of malfunctioning when failing normally to discharge 7RD fusing in good time.
The utility model has been simplified the circuit structure of the control loop of thyristor intermediate frequency electric source comprehensively, significantly; adopt modular construction; integrate the control board of " rectifier and trigger ", " inversion triggering ", " regulating and protection " three big functional circuits, size is 12cm * 20cm only.Interface is with 25 computer on line dedicated connectors.The control loop peripheral cell is few, the limit connects few.Reduce maintenance difficulty significantly, effectively improved reliability.Each phase degree of unbalance of rectifier and trigger pulse is less than ± 2 °.Every the key technical indexes all has in various degree raising than prior art.
Claims (5)
1, a kind of thyristor intermediate frequency electric source electric device has major loop, control loop: it is characterized in that control loop comprises power circuit, rectification triggering circuit, inversion triggering and start-up circuit, adjusting and protective circuit; The main body of control loop is arranged on the control board, establishes 25 inputs, output interface on the control board, is connected with corresponding site with 25 Xian Jie Defend spares by a calculator; Rectification triggering circuit by the synchronizing signal filter circuit, cross the zero-sum polarity detection circuit, sawtooth waveforms forms circuit, voltage comparator circuit, anti-interference lock-in circuit, pulse shaping circuit, pulse power amplifier circuit and constant-current source circuit and pulse-generator circuit is formed, and controls the work of major loop three-phase full-controlled bridge; Inverter trigger circuit is by frequency-tracking and t
fCircuit, pulse shaping circuit and pulse power amplifier circuit are formed, the work of control half-bridge converter; The size of inversion output is mainly controlled by the size of the direct voltage of regulating fully controlled bridge output; Regulate with protective circuit and form with buffer circuit by current signal detection circuit, current signal rectification circuit, voltage signal testing circuit, voltage signal rectified current, voltage, current signal amplification; the voltage of intermediate frequency and the three-phase main-frequency electric current of the output of monitoring half-bridge converter are implemented to regulate and protection by preset parameters.
2, thyristor intermediate frequency electric source electric device according to claim 1 is characterized in that power transformer provides synchronizing signal to rectification triggering circuit, and the dc supply of control loop is provided again simultaneously, and synchronizing signal and DC power supply are altogether.
3, thyristor intermediate frequency electric source electric device according to claim 1, it is characterized in that start-up circuit comprises that one is given charging circuit by what transformer QB, rectifier IZD, charging capacitor CQ formed, a startup relay program circuit that constitutes by relay 2J, 3J A.C. contactor 4J and button 2QA, give charging circuit shutoff inversion silicon controlled back-pressure is provided, start-up routine circuit control LD gives magnetic, and the last back-pressure of CQ in time is applied on the controllable silicon to be turn-offed.
4, thyristor intermediate frequency electric source according to claim 1 is characterized in that by 10 plastic package diodes, connect series connection by per 5 Zhizheng negatives after, the MD module is made in inverse parallel, utilizes the non-linear characteristics of diode equivalent resistance to play contactless switching t
fEffect.
5,, it is characterized in that overcurrent, overvoltage show that the employing light-emitting diode is serially connected in the protective effect circuit, shows overcurrent, overvoltage respectively according to the described thyristor intermediate frequency electric source of claim 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94246734 CN2221838Y (en) | 1994-11-26 | 1994-11-26 | Thyristor intermediate-frequency power supply electrics device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94246734 CN2221838Y (en) | 1994-11-26 | 1994-11-26 | Thyristor intermediate-frequency power supply electrics device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2221838Y true CN2221838Y (en) | 1996-03-06 |
Family
ID=33852147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94246734 Expired - Fee Related CN2221838Y (en) | 1994-11-26 | 1994-11-26 | Thyristor intermediate-frequency power supply electrics device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2221838Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102365225A (en) * | 2009-03-31 | 2012-02-29 | 奥的斯电梯公司 | Elevator regenerative drive including an air core inductor |
| CN104561470A (en) * | 2015-02-02 | 2015-04-29 | 扬中市盛达电器制造有限责任公司 | Parallel resonance intermediate-frequency welding heat treatment device |
-
1994
- 1994-11-26 CN CN 94246734 patent/CN2221838Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102365225A (en) * | 2009-03-31 | 2012-02-29 | 奥的斯电梯公司 | Elevator regenerative drive including an air core inductor |
| US8827042B2 (en) | 2009-03-31 | 2014-09-09 | Otis Elevator Company | Elevator regenerative drive including an air core inductor |
| CN104561470A (en) * | 2015-02-02 | 2015-04-29 | 扬中市盛达电器制造有限责任公司 | Parallel resonance intermediate-frequency welding heat treatment device |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |