CN1264269C - Power control device for lifting equipment - Google Patents
Power control device for lifting equipment Download PDFInfo
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- CN1264269C CN1264269C CNB021565953A CN02156595A CN1264269C CN 1264269 C CN1264269 C CN 1264269C CN B021565953 A CNB021565953 A CN B021565953A CN 02156595 A CN02156595 A CN 02156595A CN 1264269 C CN1264269 C CN 1264269C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The present invention relates to a power control device for lifting equipment, which is used for controlling the power between a power source and an electromotor. The present invention comprises a converter, a capacitor and an inverter. The present invention is characterized in that the power control device also comprises a control set which can be used as an active filter in a first state and a power feedback converter in a second state so as to obtain the efficacy of making a compromise between suppression of harmonic and regeneration and utilization of feedback power.
Description
Technical field
The present invention relates to a kind of power control unit of jacking equipment, particularly relate to the power control unit of the jacking equipment of a kind of effectively harmonic carcellation and processing feedback power.
Background technology
The elevated height of rapid economic development and quality of the life over past ten years, commercial power and people's livelihood electricity consumption are significantly grown up.For meeting power supply quality, must set up power plant and equipment for power transmission and distribution in a large number in suitable place.But because the surging result of environmental consciousness, power plant and substation land used are difficult to find, and Utilities Electric Co. can't be expanded to the plan that improves power supply quality on schedule.Begin amount of power supply recent years and more lighted red light, especially hot summer spike electricity consumption has almost faced the crisis of rationing the power supply at any time constantly, by every means when the difficulty, how to take into account power supply quality in power scheduling.
Today, the machinery equipment of most of factories or office adopted automation equipment in order to improve product quality or operating efficiency.These automation equipments can produce a large amount of harmonic waves (Harmonic) during the operation running or surging injects electric power system, influence neighbouring area user's power supply quality.Furthermore, the AC power cause of failures that causes power supply quality to reduce roughly can be divided into instantaneous pressure drop and high order harmonic component two big classes.The reason that causes of instantaneous pressure drop comprises that the caused surging of keying, building lift, air conditioners such as big power motor, electric welding machine and electric gas stove open and close caused surging or the like in thunder and lightning interchange, switch breakthrough, short circuit or ground fault, the factory.The reason that causes higher harmonics then is large-scale thyristor applied for machines, for example: inverter (Inverter), motor speed regulator, electric furnace thermostat, dimmer, electromagnetic oven, microwave oven etc.The puzzlement factor of above-mentioned higher harmonics is seen everywhere in the daily life, and very big to the influence of power supply quality, the lighter influences tonequality or reflection, and weight person will injure electric equipment or shorten the useful life of electric equipment.So, the present electric equipment power control unit of all arranging in pairs or groups usually, to eliminate the interference component of instantaneous pressure drop in the civil power and higher harmonics or the like as far as possible, especially power control unit is even more important concerning the electric equipment that fault tolerant more not takes place, for example as the jacking equipment of elevator, hand steered ladder and so on.
As Fig. 1, a kind of power control unit 1 of jacking equipment in the past is in order to control the power conversions of 12 on a power supply 11 to one motor.This jacking equipment is to be example with the elevator, and the electric power that power supply 11 is supplied is three-phase power R, S, T.The rotation that motor 12 is gone up machine 13 in order to control volume, and an end had railway carriage 14 and an end to have the hawser 16 of balance weight 15 to be set around to roll up upward on the machine 13.Power control unit 1 has a transducer (converter) 17, a capacitor 18 and an inverter 19.So, behind the alternating electromotive force feed-in power control unit 1 of power supply 11, transducer 17 can convert it to direct current power, and through capacitor 18 feed-in inverters 19, thereafter inverter 19 is subjected to PWM (Pulse width modulation, pulse wave width modulation) control of control circuit 191 and change direct current power and become the variable voltage variable frequency alternating electromotive force to export motor 12 to is so that motor 12 rises or decline because of the electric power action drives railway carriage 14.
So, though power control unit 1 is fit to the electric power of motor 12 actions with power supply 11 conversion in the past, yet because transducer 17 be a diode rectifier, it can only be effectively converts interchange to direct current also effective harmonic carcellation.Yet, just as aforementioned, the factor that causes harmonic wave in the daily life is more and more many, even if power supply 11 supplies almost do not have the electric power of harmonic wave, transducer 17 in the power control unit 1 also may cause harmonic wave with the action of inverter 19, cause in the past that power control unit 1 can't provide the enough electric power of good quality, the related probability that makes jacking equipment break down improves thereupon, and what is heard is arranged when making jacking equipment fault that causes because of harmonic wave even the news of burning.Therefore, for considering of fail safe, people no longer are only limited to power conversions and wish that it can effectively improve the ability of harmonic carcellation the requirement of power control unit 1, make the method for multiple effective harmonic carcellation occur one after another, for example use PWM switching circuit (as being the inverter 19 of PWM switching circuit among Fig. 1) as transducer 17 or in power supply 11 and transducer 17 collocation, one active filters (Activefilter) or the like.
Fig. 2 shows a kind of detailed circuit diagram of active filters in the past 2.This active filters 2 is connected in power supply 11 supply electric power (if the three-phase power of Fig. 1, then circuit 20 should be three-line, for convenience of explanation at this then with a representative) to the circuit 20 of transducer 17.At first suppose the load current I of feed-in transducer 17
LWaveform such as Fig. 3, it supplies with sine-wave current I by power supply 11
1With harmonic wave I
hConstitute.So, the load current I of harmonic wave arithmetic unit (Harmonicaccumulator) the 21 meeting sense line 20 of active filters 2
LTo isolate harmonic current I as Fig. 4
hSimultaneously, dc voltage controller 23 can be according to the 221 voltage V of the capacitor in the PWM switching circuit 22
d(this voltage V
dIdentical with the voltage of the capacitor 18 of power control unit 1), a predetermined voltage V
DfVoltage V with power supply 11
sProduce a comparison signal I
a, then comparison signal I
aWith harmonic current I
hAfter the comparison operation with from the electric current I of PWM switching circuit 22 sensing gained
cThe control signal input PWM switching circuit 22 that feed-in grid pulse generator 24 makes each transistor 222 in the PWM switching circuit 22 activate or close with generation is so that 22 outputs and harmonic current I of PWM switching circuit
hAnti-phase offset current I
c(as Fig. 5) with feed-in circuit 20, so the harmonic current I on the circuit 20
hMeeting and offset current I
cCancel out each other.Thereby, can solve the effectively shortcoming of filtering of power control unit 1 in the past.
In addition, because motor 12 may be because of rolling up machine 13 rotation directions and driving running or feedback running because of the difference between the weight of railway carriage 14 amounts of stressing and balance weight 15 decides in the jacking equipment.Specifically, be equivalent to the load-carrying of staffing and when rising, motor 12 receives the electric power that inverter 19 is provided for driving running when cabinet 14 carrying.On the contrary, when same case lower case 14 descended, then motor 12 can be feedback running and be produced feedback power to capacitor 18.So, when feedback power during, then can cause assembly to burn greater than 18 energy loads of capacitor.So, the method that has multiple solution feedback power at present, wherein a kind of promptly No. 75200221 patent case proposes " a kind of processing unit of controlling the lift feedback power " in Taiwan by Japanese trader Mitsubishi Denki K.K., and it is feedback power to be reclaimed through electric power back coupling processor use.
Fig. 6 is a kind of electric power back coupling processor 3 of PWM mode.This processor 3 roughly has dc voltage controller 31, a grid pulse generator 32 and a PWM switching circuit 33.The capacitor 18 of the power control unit 1 among the capacitor 331 in the PWM switching circuit 33 and Fig. 1 is in parallel and have an identical voltage V
dWhen the voltage of capacitor 331 is higher than a predetermined voltage V
DfThe time, then dc voltage controller 31 can be according to the 331 voltage V of the capacitor in the PWM switching circuit 33
d, predetermined voltage V
DfVoltage V with power supply 11
sProduce a synchronous comparison signal I
a, then synchronous comparison signal I
aWith electric current I from PWM switching circuit 33 sensing gained
cFeed-in grid pulse generator 32 after the comparison operation, import PWM switching circuit 33 with the control signal that generation makes each transistor 332 in the PWM switching circuit 33 activate or close, so that PWM switching circuit 33 becomes recovery electric power feed-in power supply 11 with the electric power homophase of power supply 11 being stored in power conversions in the capacitor 331, for re-using.It is too high and cause the problem of fault and also can be with the feedback power regeneration so, not only can to solve feedback power.In addition, PWM electric power back coupling processor 3 can be used as the PWM transducer, with harmonic carcellation, yet its required power must be suitable with the power of motor 12, for example originally if only as feedback power handle the time spent then its power may only need motor 12 power 1/2nd, and during as transducer, then must equal the power of motor 12, cause the power demand of the PWM electric power back coupling processor 3 that has harmonic carcellation and feedback power processing concurrently quite big, and volume and price are to increase and several times are grown up with power, cause the volume of feedback power processor 3 also quite big and price is not striking.
So, if utilize PWM electric power to feedback the problem that processor 3 handles harmonic wave and feedback power, have then that power is big, volume greatly and the high shortcoming of cost.Reviewing active filters 2 can lower-wattage capacity (as the power 1/2nd of motor 12) provide the function of harmonic carcellation, harmonic carcellation function compared to PWM electric power back coupling processor 3, have that power is lower, volume is little and the low advantage of cost, yet but can't solve the problem of feedback power regeneration.Thereby if the harmonic carcellation function can be provided by active filters 2, then the power demand of feedback power processor 3 only need meet feedback power and requires to get final product, thereby can solve that power is big, volume big and the high shortcoming of cost.Yet, if directly make the power control unit of jacking equipment arrange in pairs or groups an active filters 2 and electric power back coupling processor 3, use with respectively for the regeneration of harmonic carcellation and electric power the time, replace originally high-power electric power back coupling processor 3 with the active filters 2 of utilizing lower-wattage with electric power back coupling processor 3, thereby can reach the effect that power and cost reduce, yet, cause cost and volume still can not to be in any more because the function that harmonic carcellation and feedback power reclaim is single board distinctly.
In fact, active filters 2 is quite similar with the circuit framework of electric power back coupling processor 3, all have PWM switching circuit 22,33, dc voltage controller 23,31 and grid pulse generator 24,32, and both using times are to stagger, active filters 2 is when supply electric power, and electric power back coupling processor 3 is when electric power is feedback.So this case inventor thinks and if provide the two kind functions of active filters 2 with electric power back coupling processor 3 with single device, then with respect to originally using simultaneously under both situations, then can effectively reduce power, cost and volume.
Summary of the invention
A purpose of the present invention is to provide a kind of power control unit of jacking equipment, to reach the effect of taking into account harmonic carcellation and electric power back coupling function of use.
A further object of the present invention is to provide a kind of power control unit of jacking equipment, to reach the effect that reduces effect.
Another object of the present invention is promptly providing a kind of power control unit of jacking equipment, to reach the effect that reduces cost.
A further object of the present invention is promptly providing a kind of power control unit of jacking equipment, to reach the effect of reduced volume.
So the power control unit of jacking equipment of the present invention comprises a transducer, a capacitor, an inverter and control set, wherein, this transducer becomes direct current power in order to the alternating electromotive force of changing a power supply; This capacitor is the outlet side that is connected in this transducer; The direct current power that this inverter is changed this capacitor becomes the variable voltage variable frequency alternating electromotive force to give a motor, and the electric power that this motor is accepted this inverter rises or descends to drive a load; And this control set connect the input side of this capacitor and this transducer and switch on one first state and one second state in one, the voltage that senses this capacitor when this control set is during less than a predetermined value, then the harmonic wave that is arranged in this first state and eliminates the alternating electromotive force of this power supply is gathered in this control, so that initiatively filter function to be provided, and the voltage that senses this capacitor when this control set is during greater than this predetermined value, then this control set is positioned at this second state and the electric feedback of this capacitor is given this power supply, so that the feedback power translation function to be provided.
Description of drawings
Fig. 1 is a kind of schematic diagram of power control unit of jacking equipment in the past, and this power control unit is the jacking equipment use of collocation one for elevator;
Fig. 2 is a kind of detailed circuit diagram of active filters of power control unit in the past;
Fig. 3 is the oscillogram of the example of the load current IL among Fig. 2;
Fig. 4 is the oscillogram of harmonic current Ih among the load current IL among Fig. 2;
Fig. 5 is by the oscillogram of the offset current Ic of active filters output among Fig. 2;
Fig. 6 is the detailed circuit diagram of the transducer of the PWM mode used of a kind of feedback power of power control unit in the past;
Fig. 7 is the detailed circuit diagram of preferred embodiment of the present invention.
Embodiment
For illustrative purposes, the jacking equipment in following examples is to be example with the elevator, yet has the knack of this skill person when knowing that the jacking equipment of the provided rise and fall of other kind also is provided jacking equipment, and for example hand steered ladder is not limited to the explanation of this paper.
As Fig. 7, an embodiment of the power control unit 4 of jacking equipment of the present invention comprises a transducer 41, a capacitor 42, an inverter 43, a motor 44 and a control set 5.
The improvement of this case focuses on making the function that control set 5 has can provide filtering harmonic wave and electric power to bring back to life in different conditions.Control set 5 is to connect the input side 412 of capacitor 42 and transducer 41 and switch in one first state (referring to the driven by power state) and one second state (refer to electric power bring back to life state) one, the voltage that senses capacitor 42 when control set 5 is during less than a predetermined value Vdcf, then control the harmonic wave that set 5 is arranged in first state and eliminates the alternating electromotive force of power supply 6, so that initiatively filter function to be provided.And the voltage that senses capacitor 42 when control set 5 is during greater than predetermined value Vdcf, and then control set 5 is positioned at second state and the electric feedback of capacitor 42 is given power supply 6, so that the feedback power translation function to be provided.The control of this example set 5 has a harmonic wave arithmetic unit (Harmonic accumulator) 51, one direct current voltage controller (DC voltagecontroller) 52, one grid pulse generator 53, a PWM switching circuit 54, a switch 55, two groups of electric current detectors 56,57, a voltage detector 58 and comparators 59.
Harmonic wave arithmetic unit 51 receives through electric current detector 56 and senses the synthetic load current IL of the three phase mains circuit 61,62,63 of transducer 41 input sides 412 and separate harmonic current Ih among the output load current IL.This routine harmonic wave arithmetic unit 51 has a basic wave calculator (fundamentalcalculator) 511 and a comparator 512.Basic wave calculator 511 connects 56 (referring to the first electric current detector) of electric current detectors to receive load current IL and to calculate the basic wave electric current I 1 (this basic wave electric current I 1 refers to by the primary current of power supply 6 outputs without Harmonic Interference) of power supply 6 outputs according to load current IL.Then, comparator 512 reception load current IL and basic wave electric current I 1 are to compare output harmonic wave electric current I h.
In addition, power control unit 4 more comprises a feedback power and consumes circuit 45, is when motor 44 is altered to the state of feedback power, the circuit when protection consumption feedback power system contingency is not moved.This routine feedback power consumes circuit 45 and is positioned at the outlet side 411 of transducer 41 and in parallel with capacitor 42, and be serially connected with one and bring back to life resistance 451 and one for transistorized switch 452, this switch 452 is to become feedback power and surpass a certain dangerous values (this dangerous values is higher than predetermined value Vdcf and is lower than the withstand voltage of capacitor 42) time in motor 44 to be switched on, magnitude of voltage Vdc with real-time consumption capacitor 42, thereby can reduce the probability of power control unit 4 faults, to reach the effect that improves product stability.For instance, the withstand voltage of supposing capacitor 42 is that 450V, predetermined value Vdcf are 370V, when dangerous values is 390V, if when the magnitude of voltage Vdc of capacitor 42 is 340V, then are positioned at first state, and motor 44 receives electric power and is in the driven by power state from power supply 6.And when the magnitude of voltage Vdc of capacitor 42 was 370V, then control set 5 became second state and motor 44 also to become the electric power operating condition of bringing back to life by first Status Change to give power supply 6 with feedback electric power, and feedback power consumed circuit 45 and was not activated this moment.When having become electric power, motor 44 brings back to life running and control set 5 when not entering second state and handling feedback power in real time, then the magnitude of voltage Vdc of capacitor 42 can continue to rise, and be increased to 390V as magnitude of voltage Vdc, then switch 452 can be activated and consume the electric power of bringing back to life that capacitor 42 stores with the utilization resistance 451 of bringing back to life.So, the collocation feedback power consumes circuit 45, can be in the safeguard measure of the real-time consumption electric power when control set 5 is not moved in good time, and then reach the effect of avoiding fault and raising fail safe.
According to aforementioned components and correlation, hereinafter will be respectively at first state and the explanation of the second status signal processing procedure, so that the easier quilt of present embodiment is understood.
(1) first state
When the voltage Edc (voltage that also can refer to capacitor 42) of capacitor 541 was less than predetermined value Vdcf when giving motor 44 by power control unit 4 supply capabilities, then control set 5 was moved in first state that can be considered the active filters function and is opened the switch of controlling in the set 5 55.So, the harmonic wave arithmetic unit 51 in the control set 5 can receive load current IL and go out harmonic current Ih among the load current IL through the computing post analysis through electric current detector 56.Simultaneously, dc voltage controller 52 is relatively behind the voltage Edc of predetermined value Vdcf and capacitor 541, and after the computing compensation with the voltage Vs of power supply 6 product mutually, with generation sine wave signal IC.Then, sine wave signal IC and harmonic current Ih compare (Iar* as a result of comparison operation this moment can be identical with harmonic current Ih size) after the computing, electric current I a with electric current detector 57 sensings compares once more, after grid pulse generator 53 produces the variable frequency range of control PWM switching circuits 54, the PWM square wave of variable voltage, producing input side 412 circuits of anti-phase harmonic current IL feed-in transducer 41, and then eliminate harmonic current Ih among the load current IL.
(2) second states
When the unequal and motor 44 of the load 71 and the ratio of balance weight 72 enters generator state (power state of bringing back to life), then control set 5 can enter in second state (electric power bring back to life state) and switch 55 can cut out (i.e. open circuit, cause harmonic current Ih can't input comparator 59).So, after dc voltage controller 52 compares the voltage Edc of predetermined value Vdcf and capacitor 541, and after computing compensation with the voltage Vs of power supply 6 product mutually, to produce sine wave signal Iar*, again with after the electric current I a of electric current detector 57 compares, to produce the PWM square wave of variable frequency range, variable voltage through grid pulse generator 53, with control PWM switching circuit 54 feedback power too much in the capacitor 541 is sent back in the power supply 6, to reach the effect that power recovery is used.At this, the signal of supply voltage VS phase product with make comparisons through the electric current I a of electric current detector 57, mainly be in order to produce with the voltage same phase of power supply 6 and for sinusoidal wave feedback electric current (i.e. the electric current of exporting by PWM switching circuit 54), to reduce the high order harmonic component (THID) in the feedback electric current.In addition, when control set 5 is positioned at second state, can make harmonic wave arithmetic unit 51 close and be failure to actuate, with further saving power consumption.
Described before combining, power control unit 4 of the present invention really can be by control set 5, initiatively filter function is provided when first state (supply of electric power), to eliminate the harmonic current Ih among the load current IL, and provide when second state (electric power back coupling) electric power to feedback conversion, feedback to power supply 6 too much feedback power is converted to, to reach the goal of the invention of utilizing single control set 5 to take into account initiatively filtering and electric power back coupling translation function with the feedback electric current of the voltage VS homophase of power supply 6.So, control set 5 can be when first state, harmonic current Ih and 41 rectifications of collocation transducer can be eliminated the pulse wave electric current (non-sinusoidal waveform electric current) among the load current IL among the elimination load current IL, so that in the electric current of transducer 41 outlet sides 411 for containing harmonic current Ih and be sinusoidal wave direct current power, and control set 5 can be when second state capacitor 541 in too much feedback power convert to the synchronous feedback electric current of the voltage of power supply 6 and feedback to power supply 6.Therefore, because when harmonic carcellation, the power demand of active filters very is lower than electric power and feedbacks processor 3 (for example 1/2nd or 1/3rd), so the power that control set 5 of the present invention requires can very be lower than electric power back coupling processor 3, power is low, volume is little and the low effect of cost and can reach.In addition, if mode compared to an active filters 2 and the electric power back coupling processor 3 of arranging in pairs or groups respectively, power control unit 4 of the present invention reaches with single control set 5 takes into account initiatively filtering and feedback power translation function, thereby also can reach the effect that cost and volume significantly reduce.
Claims (9)
1. the power control unit of a jacking equipment is characterized in that it includes:
One transducer becomes direct current power in order to the alternating electromotive force of changing a power supply;
One capacitor is the outlet side that is connected in this transducer;
One inverter is that the direct current power of this capacitor of conversion becomes the variable voltage variable frequency alternating electromotive force to give a motor, and the electric power that this motor receives this inverter rises or descends to drive a load; And
One control set, this control set comprises the harmonic wave arithmetic unit, switch, the pulse wave width modulation unit, the first electric current detector, the voltage detector, the second electric current detector, this control set connect the input side of this capacitor and this transducer and switch on one first state and one second state in one, the voltage that senses this capacitor when this control set is during less than a predetermined value, the harmonic wave that this control set is arranged in this first state and eliminates the alternating electromotive force of this power supply, so that initiatively filter function to be provided, and the voltage that senses this capacitor when this control set is during greater than this predetermined value, this control set is positioned at this second state and the electric feedback of this capacitor is given this power supply, so that the feedback power translation function to be provided.
2. the power control unit of jacking equipment as claimed in claim 1 is characterized in that this control set comprises:
One harmonic wave arithmetic unit is to connect the input side of this transducer and in order to calculate the harmonic wave that it comprises in the electric power by this power supply;
One switch, have one first end and one second end, and this first end is to connect this harmonic wave arithmetic unit, and this switch opens so that this harmonic wave is sent to this second end through this switch in this first state, closes so that harmonic wave no longer is sent to second end through this switch when being positioned at this second state;
One pulse wave width modulation unit, it is second end that connects this switch, and receive the anti-phase signal of harmonic wave in the harmonic wave of this harmonic wave integrating instrument and output and the alternating electromotive force of this power supply in this first state, eliminating the harmonic wave in this alternating electromotive force, and in this second state, will give this power supply from the power conversions feedback of this capacitor.
3. the power control unit of jacking equipment as claimed in claim 2 is characterized in that this pulse wave width modulation unit has:
One direct current voltage controller, be the voltage of relatively this capacitor and this predetermined value and through compensation operation again with this power source voltage relatively after output;
One comparator is to receive the relatively back output of signal of harmonic wave and the output of this dc voltage controller in this first state from this harmonic wave arithmetic unit, and directly exports the signal of this dc voltage controller when this second state;
One grid pulse generator is a square wave of exporting a variable frequency range and variable voltage according to the output signal of this comparator; And
One pulse width modulation circuit, be according to this grid pulse generator output square wave control in the anti-phase signal of this first state output and this harmonic wave with in the electric power of this this capacitor stores of second state exchange for the electric power of the electric power homophase of this power supply to be fed back to this power supply.
4. the power control unit of jacking equipment as claimed in claim 2 is characterized in that: this control set more comprises one first electric current detector, in order to the electric current of the input side of this transducer of sensing to import this harmonic wave arithmetic unit.
5. the power control unit of jacking equipment as claimed in claim 3 is characterized in that: this control set more comprises a voltage detector, in order to the voltage of this capacitor of sensing and import this dc voltage controller.
6. the power control unit of jacking equipment as claimed in claim 3, it is characterized in that: this control set more comprises one second electric current detector, in order to electric current and this grid pulse generator of feed-in of the outlet side of this pulse width modulation circuit of sensing, so that this grid pulse generator is with the output signal of this comparator and this current ratio square wave of back beginning output one variable frequency range and variable voltage.
7. the power control unit of jacking equipment as claimed in claim 1, it is characterized in that: this power control unit more comprises the switch of connecting with this resistance with a resistance of this capacitor parallel connection, and this switch is to activate so that the electric power of this this capacitor of resistance consumption in second state in good time.
8. the power control unit of jacking equipment as claimed in claim 7 is characterized in that: this switch is that the electric power of this capacitor is activated when surpassing a dangerous values, so that this resistance action, and this dangerous values is to be higher than this predetermined value.
9. the power control unit of jacking equipment as claimed in claim 7, it is characterized in that: this switch is a transistor.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021565953A CN1264269C (en) | 2002-12-13 | 2002-12-13 | Power control device for lifting equipment |
| JP2004028617A JP2005223999A (en) | 2002-12-13 | 2004-02-04 | Power controller for elevator facility |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021565953A CN1264269C (en) | 2002-12-13 | 2002-12-13 | Power control device for lifting equipment |
| JP2004028617A JP2005223999A (en) | 2002-12-13 | 2004-02-04 | Power controller for elevator facility |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1508962A CN1508962A (en) | 2004-06-30 |
| CN1264269C true CN1264269C (en) | 2006-07-12 |
Family
ID=54804121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021565953A Expired - Fee Related CN1264269C (en) | 2002-12-13 | 2002-12-13 | Power control device for lifting equipment |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2005223999A (en) |
| CN (1) | CN1264269C (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI120665B (en) * | 2007-06-20 | 2010-01-15 | Kone Corp | Power control of the transport system |
| KR100981438B1 (en) | 2008-07-29 | 2010-09-13 | (주)인텍에프에이 | Regenerative energy feedback apparatus for inverter and inverter having the same |
| JP5801128B2 (en) | 2011-07-26 | 2015-10-28 | 住友重機械工業株式会社 | Injection molding machine |
| JP5762869B2 (en) | 2011-07-26 | 2015-08-12 | 住友重機械工業株式会社 | Injection molding machine |
| KR102043950B1 (en) * | 2013-03-05 | 2019-11-12 | 엘지전자 주식회사 | Power converting apparatus and air conditioner having the same |
| US9048720B2 (en) * | 2013-04-02 | 2015-06-02 | Raytheon Company | Bidirectional motor driver low voltage power supply (LVPS) |
| AU2015331531B2 (en) | 2014-10-15 | 2018-04-05 | Daikin Industries, Ltd. | Active filter and alternating current-direct current conversion device |
| CN105098781A (en) * | 2015-09-30 | 2015-11-25 | 成都星宇节能技术股份有限公司 | Hybrid type active power filter compensation system used for three-phase network |
| CN105703622B (en) * | 2016-03-14 | 2018-06-26 | Abb瑞士股份有限公司 | DC-DC power converter and its method |
| JP6990148B2 (en) * | 2018-05-30 | 2022-01-12 | 株式会社日立ビルシステム | Elevator drive control system |
| US11063550B2 (en) * | 2018-08-01 | 2021-07-13 | Eaton Intelligent Power Limited | Active harmonic filter and regenerating energy control apparatus and method of operation |
-
2002
- 2002-12-13 CN CNB021565953A patent/CN1264269C/en not_active Expired - Fee Related
-
2004
- 2004-02-04 JP JP2004028617A patent/JP2005223999A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN1508962A (en) | 2004-06-30 |
| JP2005223999A (en) | 2005-08-18 |
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