CN103780062B - The security function of electric machine controls - Google Patents
The security function of electric machine controls Download PDFInfo
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- CN103780062B CN103780062B CN201310485381.2A CN201310485381A CN103780062B CN 103780062 B CN103780062 B CN 103780062B CN 201310485381 A CN201310485381 A CN 201310485381A CN 103780062 B CN103780062 B CN 103780062B
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- 238000004804 winding Methods 0.000 claims description 5
- 229910002056 binary alloy Inorganic materials 0.000 claims description 2
- 230000000875 corresponding Effects 0.000 description 7
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- 238000004146 energy storage Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
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Abstract
The present invention relates to a kind of equipment (1) and the method for converter (3) for activating the electric machine (2) with security function (particularly safe torque cuts off (STO) function), wherein by the converter circuit (4) of a preferred timing, an electric isolution output voltage (UA) by an input voltage (UE) produce, it is that this converter (3) produces for carrying out its operation and for triggering a control signal (S of this security function according to multiple standards from this output voltageHS, SLS), and be periodically with this input voltage (UE) semiconductor switch (V) connecting produces one and activate signal (ST), and when described output voltage is more than a switching threshold (UMax) time, this output voltage (UA) be restricted.
Description
The present invention relates to a kind of safe merit for the electric machine by Frequency Converter Control electric power operation or supply of electric power
The method of energy.The invention still further relates to a kind of apparatus for carrying out the method, wherein security function is interpreted as specifically meaning institute
The safe torque of meaning cuts off (STO) function.Such method and corresponding equipment are known from EP 2 495 869 A2
's.
In the actuation techniques field of electric machine the most either synchronously or asynchronously electromotor, in order to reliably avoid by being not intended to
Or the injury that accident rotating driver is caused, the function that safety guides is necessary.In this regard, necessary security function is
The safety stop (be referred to as safe torque and cut off (STO)) of driver, by pacifying described driver with the power supply powered for it
Entirely isolate, in order to slow down after security function triggering, and according to the moment of torsion of rotating speed and connection reliably to reach
Halted state.
In the case of converter is conventional threephase motor feed in a controlled manner, by by described converter and
Therefore threephase motor or electric machine and isolated from power, this security function or the control of every security function or trigger in this change
Frequently device occurs.It is commonly used for frequency conversion by the 24V DC input voitage that switch (such as relay) is converter supply
Device is powered.If stopping during function carrying out, activating this switch to disconnect machine, converter being controlled required
Input voltage and therefore for its power supply power supply be disconnected.
For this purpose it is proposed, safe torque cut off connect (STO function) from US 7,868,619 B2 it is known that wherein for control
Device and for the driver of on and off switch or the 24V input voltage of the power semiconductor switch of converter, is opened by bipolar
Close safely interrupt (described driver is activated by described control device), and therefore electric machine power supply the most safely in
Disconnected.
From DE 10 2,011 003 922 A1 with from the known a kind of control device of EP 2 495 869 A2 being initially mentioned,
This control device is galvanically isolated the electronic of transmitting device with the form with the converter of STO function for having one first
Machine, this transmitting device only produces the output signal of the power semiconductor (IGBT) for activating converter, when supply voltage exists
Time, the power semiconductor of converter provides running voltage for motor.The device provided for this purpose includes a resonance electricity
Road, its supply voltage depends on an actuator signal, and this actuator signal represents admissible electric motor operation shape in turn
State.It is transferred to amplify and decoupling circuit and commutator by resonance circuit signal by second transmitting device, this commutator
Produce supply voltage for this first transmitting device to be used for activating these power semiconductors.
Problem solved by the invention is to illustrate that a kind of method of improvement and a kind of specially suitable equipment are for electricity
The security function of mechanism of qi device is controlled, and wherein this control reliably plays merit when being directed at input voltage greater than or equal to 60V
Can, guarantee security function, especially while make power consumption the least simultaneously.
For the method, solve according to the method for the following converter for activating the electric machine with security function
This problem, wherein, for the normal operating of converter and for triggering an electric isolution output voltage of this security function
Being produced by an input voltage, wherein, output voltage is to be produced by a converter circuit and be supplied to a threshold value
Switch, threshold switch is that converter produces a binary control signal, wherein when output voltage is more than a upper limit threshold,
Control signal activates the operation of converter, and wherein when output voltage is not up to a lower threshold, is used for triggering safety
The operation of the control signal deexcitation converter of function, and produced by the semiconductor switch that output voltage is converter circuit
Raw one activates signal, is connected on input voltage to switch periods, wherein when output voltage exceedes maximum, and output electricity
Pressure is adjusted or is reduced to set point magnitude of voltage.
For this equipment, solving this problem according to the following equipment for implementing said method, this equipment has one
Individual converter circuit, converter circuit has a transformator, and transformator has a semiconductor switch on master, for from
One input voltage provides an electric isolution output voltage, and has a commutator on the secondary side, and has connection
To an open loop and/or the closed-loop control device in this commutator downstream, when output voltage exceedes maximum, control device for being somebody's turn to do
Converter produces the control signal for triggering security function, and produces actuating signal for semiconductor switch.
Hereinafter, favourable configuration, variant and development are described.
For this purpose it is proposed, electric isolution VD is to be produced by DC input voitage, and it is that converter is from described
Electric isolution VD creates for its normal operating and for triggering the control signal of security function.Additionally, be
Semiconductor switch creates one and activates signal, and this semiconductor switch is periodically connected with input voltage, and when output electricity
When pressure is beyond switching threshold or threshold value, output voltage reduces or is restricted.
In this case, the present invention is based on such idea, although i.e. can use potentiometer by simplest mode
Circuit, in order to control to be even above or be equal to the voltage range of the bigger input voltage of 60V, be with or without down for being galvanically isolated
Trip photo-coupler, in the case of this type of high input voltage, at the ohmic resistor of potentiometer, the highest power consumption is not
Profit.Even with being with or without the constant-current source of downstream light bonder, cause at the correspondingly high input voltage of required 60V
Unwelcome high power consumption.Voltage is limited and can also use known circuit, in order to voltage when fault being occurred increases
Add and be restricted to 24V input voltage.But, this type of voltage limiting circuit cannot ensure that required security function is with unaffected side
Formula is guaranteed, and cannot ensure to be reliably prevented undesirable disconnection of input voltage.
In contrast to this, the method according to the invention and the equipment according to the present invention are provided and are designed to permit
Being permitted an operation case, this operation case is for having the converter numeral for lower outbound control circuit of low power consumption simultaneously
Input has the input voltage of the increase of such as 60V, and to reliably ensure that required security function, particularly STO merit
Energy.
For this purpose it is proposed, this equipment provides the converter electricity of the preferably timing with the transformator for electrically insulating energy transmission
Road, distributes an activatable semiconductor switch on master to this transformator and distributes a commutator on the secondary side.
This converter circuit is embodied in here as a class timing voltage converter for circuit, and this timing voltage converter is such as made
For inverse-excitation type converter otherwise just operate as forward converter, and will be the direct current input electricity of 24V under normal circumstances
Pressure is converted into VD, and this VD is supplied to a device for producing control signal for converter.
With regard to circuit and/or programming for, when device input voltage and therefore output voltage exceed predefined maximum
During value, the device connecting commutator downstream is also devised to the actuating for producing timing for the semiconductor switch of converter circuit
Signal.Due to this actuating signal, if output voltage exceedes maximum, this output voltage is subject to by open loop or closed loop control
Limit.For this purpose it is proposed, this device is connected on semiconductor switch by feedback circuit in actuating side, it is therefore preferred to have an electricity
Stream isolation element, particularly with the form of photo-coupler.Feedback circuit includes that one produces based on clock or device easily
Activate signal for the pulse-modulator that the operating frequency of semiconductor switch is adjusted.In this case, impulse modulation
Device is suitably used to the pulse width modulator (PWM) that the working cycle of clock or actuating signal is adjusted by semiconductor switch
And/or pulse interval modulation device (PIM).
Open loop and/or closed-loop control device preferably have a comparator and threshold switch function, converter circuit
Output voltage is applied to this comparator and threshold switch function, for activating this actuating signal for semiconductor switch.Additionally, open
Ring and/or closed-loop control device suitably include a set point/actual value comparator and connect described comparator downstream
One pulse-modulator, for the deviation based on the output voltage from the set-point value work frequency to this semiconductor switch
Rate is adjusted.
In the favourable configuration of equipment, open loop and/or closed-loop control device have be connected to downstream or one of distribution
Schmidt trigger is as threshold switch, and the output voltage of converter circuit is applied to this threshold switch for producing for converter
Binary control signal.When output voltage exceedes upper limit threshold, control signal preferably has for grasping converter
The high level made, and when output voltage is not up to lower threshold, there is the low level triggering security function.
Repeat easily to embody converter circuit and open loop and/or closed-loop control device.Additionally, open loop and/or closed loop
The function (particularly comparator and threshold switch function thereof) controlling device is suitably incorporated in two redundancy microprocessors,
For the output voltage of converter circuit, the input of this redundancy microprocessor is coupled on other microprocessors of correspondence.
That particularly preferably passes through photo-coupler form in control side is galvanically isolated element, is connected to by semiconductor switch
In open loop and/or closed-loop control device.In the variant of particularly preferred converter circuit, should or in the situation of Redundancy Design
Under, each semiconductor switch forms the series circuit of the armature winding with transformator, there is input electricity at this series circuit
Pressure.Then, suitably carry out being used for the capacitor buffering the input voltage fluctuated the most slightly with this series circuit
It is connected in parallel.The control input (grid) (being preferably embodied as MOSFET) of semiconductor switch is then by being galvanically isolated optical coupling
The phototransistor of device is advantageously connected on described buffer capacitor.
The advantage that the present invention is realized specifically includes by using converter circuit to control the safe merit of electric machine
Can, according to the present invention bigger or wide input voltage range more than 60V with a safety and (especially with respect to setting
Standby) intrinsic secured fashion and the lowest power consumption controlled.Due to the Redundancy Design of converter circuit and be used for triggering peace
The device of global function (particularly STO function) and its mutually monitor, according to the safety of the equipment of the present invention and inherently safe
Property is enhanced further.
The exemplary embodiment of the present invention the most explained in greater detail below, wherein:
Fig. 1 shows the schematic block circuit diagram of the equipment of the converter for controlling electric machine, this electric machine
Converter has on the input side for triggering security function and for limiting the converter circuit of voltage, and
Fig. 2 shows the Redundancy Design of converter circuit, and for circuit, converter circuit has one and is connected to downstream
The device for triggering the mutually security function of monitoring.
The multiple parts corresponded to each other in both of the figures possess identical reference number.
Fig. 1 shows the security function for controlling the threephase motor 2 as electric machine, and (particularly safe torque is cut
Disconnected (STO) function) equipment 1, this electric machine is powered by converter 3 or operates.Equipment 1 includes with transformator T
Timing converter circuit 4, on master, be connected to a semiconductor switch V of its upstream and be connected on the secondary side
To a commutator D downstream.Converter circuit 4 is by DC input voitage UEIt is converted into VD UA, this direct current is defeated
Going out voltage can be at loading resistor RLPlace is tapped, and this loading resistor is connected to ground or reference potential.Pass through electronics
Voltage is changed or converts by semiconductor switch V, activates this electronic semi-conductor switch under a certain switching or operating frequency, and
And carry out electrically insulating energy transmission by transformator T, and by commutator D to VD UADecouple.
Here, transformator T can operate as the energy storage of the inverse-excitation type converter of timing, and wherein converter is defeated
Enter and have and be galvanically isolated between end and inverter output terminal, otherwise be just galvanically isolated portion as so-called forward converter
Part.In two converter variants, opening semiconductor switch V in the way of the most controlled, its result is to reduce transformator T
In magnetic field.Input voltage can be such as UE=24V to UE=60V.
By output voltage UAIt is sent to threshold switch 5, preferably with the form of Schmidt trigger, thus is converter 5
Produce binary control signal.If output voltage UAExceed upper limit threshold U1, such as U1=11V, then threshold switch 5 produces tool
There is the binary control signal S of high levelHS, its result is coupled to the converter 3 in threshold switch 5 downstream and activates in the normal fashion
Threephase motor 2.If output voltage UANot up to lower threshold U2, such as U2=5V, then threshold switch 5 produces low level work
For binary control signal SHS, this binary control signal triggering security function (particularly safe torque cut-out), and therefore
The safety stop of threephase motor 2.
Additionally, equipment 1 includes an open loop and/or closed-loop control device 6, this control device will be by converter circuit 4
The output voltage U producedAIt is sent to the threshold switch 5 for controlling converter 3, wherein output voltage UAPass through schmidt trigger
Device 5 is converted into binary system or digital controlled signal SHS、SLS.According to high level or low level, control signal SHSActivate or deexcitation
The so-called high-pressure side (HS) of bridge circuit, the high-pressure side of bridge circuit is typically by the power semiconductor (on and off switch of converter 3
Or power semiconductor switch) particularly IGBT structure, in order to represent the normal operating of converter 3 or trigger security function.
Control signal SLSBe produce in a similar manner and in turn by opening with the threshold value of Schmidt trigger 5 form
Pass is converted into binary control signal SLS, the so-called low pressure of the bridge circuit of (activate or deexcitation) converter 3 is similarly controlled
Side (LS).For this purpose it is proposed, equipment 1 includes two control modules 1a designed, 1b samely, these control modules are specified further below
High-pressure side or HS control module 1a or low-pressure side or LS control module 1b.
Open loop and/or closed-loop control device 6 also include a threshold switch 7, preferably with the form of comparator, converter
The output voltage U of circuit 4AIt is supplied to this threshold switch on the input side.Comparator 7 is by output voltage UAWith maximum UMaxCarry out
Relatively, maximum is such as UMax=60V.If it exceeds this maximum UMax, comparator 7 produces control on the output side or cuts
Change signal SK, its result is that the switch 8 embodied by semiconductor switch or the like the most in turn is by output voltage UAIt is sent to
Set point/actual value comparator 9.If it occur that from set-point value UsOutput voltage UAActual value UiDeviation, such as set
Fixed-point value corresponds to input voltage UE=Us=24V, controller 10 (preferably PWM controller) produces for semiconductor switch V's
Clock signal S that improvement activatesT.In this case, activate semiconductor switch V by being galvanically isolated element 11, preferably with
The form of photo-coupler.By controller 10, impulse modulation (such as pulsewidth modulation (PWM) and/or pulse interval modulation (PIM))
Working cycle adjusted in this type of mode, so that output voltage UAIt is adjusted or is reduced to set-point value Us。
Transformator T is periodically connected to input voltage U by semiconductor switch V on masterEOn, and for this purpose
If output voltage UANot up to predefined ceiling voltage UMax, under a certain constant clock or operating frequency, operate this transformation
Device.Only when exceeding described ceiling voltage UMaxTime, open loop and/or closed loop control just perform behaviour by threshold switch or comparator 7
Make, as a result of which it is, by the clock or the operating frequency that change semiconductor switch V, reduce and transmitted by the energy of transformator T, and
And pass through closed loop or opened loop control by output voltage UAIt is adjusted to predefined set point voltage Us.Therefore, even higher than or etc.
In the input voltage U that the comparison of 60V is highEIn the case of, true by open loop and/or closed-loop control device 6 and converter circuit 4
Protect the safety operation of equipment 1, without the security function required for infringement electric machine 2.
Fig. 2 shows the decision design of converter circuit 4.The outfan of this converter circuit is connected to microprocessor M1's
Input E11On, wherein the function of comparator 7 and switch 8 and comparator 9 and controller 10 uses software to be carried out.With upper
Together, microprocessor M1 forms the first or HS control module 1a of equipment 1 to trip converter circuit 4.
In a similar fashion design the second or LS control module 1b, and the second or LS control module have in turn for
Implement identical redundancy converter circuit 4 and the correspondingly micro-place of redundancy of the function of open loop and/or closed-loop control device 6
Reason device M2.Redundancy microprocessor M1 and M2 is passed through output terminals A12、A22It is connected on the Schmidt trigger 5 of correspondence, described
Multiple Schmidt triggers at converter 3 respectively for they part provide binary control signal SHSAnd SLS, the most really
Protect the security function of electric machine 2.The function of Schmidt trigger 5 similarly can be integrated in microprocessor M1, M2.
By resistor R1 and R2, microprocessor M1, M2 are respectively coupled to go up each other.Microprocessor M1 and M2 enters one
Step coupling is indicated by arrow 12, and this arrow represents the data between microprocessor M1, M2 or information exchange.In order to by micro-
Processor M1, M2 couple, its input E11、E21(the output voltage U of converter circuitASupplied by input) logical
Cross resistor R1, R2 and be connected to the further input E of microprocessor M1 and M2 the most in varied situations12、E22。
In same the converter circuit 4 designed, corresponding armature winding LP1, LP2 of transformator T1 and T2 partly leads
Body switch V1, V2 are connected in series respectively in downstream.Buffer capacitor C11 or C21 is connected in parallel with series circuit, should
Series circuit includes armature winding LP1, LP2 and semiconductor switch V1, V2 of correspondence, and this buffer capacitor is the most logical
Cross diode D11, D21 and be connected to input voltage UEOn as reverse polarity protection.The secondary coil of corresponding transformator T1, T2
LS1, LS2 have and rectifier diodes D12, the D22 being connected in series downstream and the smoothing capacity device being connected connected in parallel
C12, C22, described smoothing capacity device is respectively provided with the loading resistor R of connection connected in parallel in turnL1Or RL2。
According in the embodiment of Fig. 2, implement open loop and/or closed-loop control device by comparator and threshold switch function
6, by using software by this comparator and threshold switch Function Integration Mechanism to microprocessor M1, M2.It is preferably embodied as
The actuating side (gate electrode side) of semiconductor switch V1, V2 of MOSFET by photo-coupler 11 be connected to correspondence microprocessor M1 or
The corresponding output terminal of clock A of M211、A12On, as being galvanically isolated element in feedback circuit.As shown with symbol, produce
Clock signal STBeing square wave signal, photodiode D13, D23 of photo-coupler 11 is periodically by this square wave signal
It is applied to supply voltage VCC, its result is so that it alternately brightens or dimmed.Therefore, the photoelectricity by corresponding photo-coupler 11 is brilliant
Body pipe F1, F2 periodically turn on or close, and therefore by the voltage water of tap Z1, Z2 of buffer capacitor C11, C21
Flat pass and deliver to control input (grid) G1, G2 of corresponding semiconductor switch V1 or V2.Therefore, corresponding semiconductor switch
Primary coil LP1, LP2 of transformator T1 or T2 are periodically connected to input voltage U by V1, V2EOn.According to adjust respectively
Operating frequency or by open loop or closed loop control predefined working cycle, is supplied to the microprocessor of correspondence as input voltage
The output voltage U of M1 or M2AIn the primary side of the transformator in commutator D12, D22 downstream at capacitor C12, C22 and
At loading resistor RL1、RL2Place is adjusted.
When meeting or exceeding output voltage UAOr input voltage UEMaximum UMaxTime, such as the exemplary enforcement with reference to Fig. 1
The function of the threshold circuit described by example and the clock generation function for semiconductor switch V1, V2, as software or
Algorithm is installed in microprocessor M1, M2.
Due to two control modules 1a and the redundancy of 1b, and due to its coupling and mutually monitoring, though the control of equipment
One of module 1a or 1b execution mistake function or up hill and dale fault, the most always can trigger security function.Therefore, guarantee generally
The tight security of the height inherent safety of equipment 1 and therefore equipment 1.
The present invention is not limited to those described above exemplary embodiment.On the contrary, the master without departing from the present invention
During topic, those skilled in the art can also thus draw other variants of the present invention.Specifically, illustrate in conjunction with exemplary embodiment
All single features can also carry out combination with one another in the case of without departing from subject of the present invention and then in another way.
Reference number list
1 controls equipment
1a HS control module
1b LS control module
2 machines/threephase motor
3 converters
4 converter circuits
5 threshold switches/Schmidt trigger
6 open/close control device
7 threshold switches/comparator
8 switches
9 set-points/actual value comparator
10 PWM controller
11 elements/photo-coupler
12 data arrows
A12, A22Outfan
C11, C21 buffer capacitor
C12, C22 smoothing capacity device
D11, D21 reverse polarity protection's diode
D12, D22 rectifier diodes
D13, D23 photodiode
E11, E21First input end
E12, E2 2Second input
F1, F2 phototransistor
G1, G2 control input/grid
LP1, LP2 armature winding
LS1, LS2 secondary windings
M1, M2 microprocessor
R1, R2 resistor
RL1, RL2Loading resistor
SkControl/switching signal
STActivate signal
SHSHigh-pressure side control signal
SLSLow-pressure side control signal
T1, T2Transformator
UAOutput voltage
UEInput voltage
UiActual value
UsSet-point value
UMaxMaximum
V1, V2Semiconductor switch
Z1, Z2Tap
Claims (10)
1. for the method activating the converter (3) of the electric machine (2) with security function, in the method, for being somebody's turn to do
The normal operating of converter (3) and for triggering an electric isolution output voltage (U of this security functionA) it is by an input
Voltage (UE) produce,
Wherein
-this output voltage (UA) it is to be produced and be supplied to a threshold switch (5) by a converter circuit (4), this threshold value is opened
Close and produce a binary control signal (S for this converter (3)HS, SLS), wherein as this output voltage (UA) more than a upper limit
Threshold value (U1) time, this control signal (SHS, SLS) activate the operation of this converter (3), and wherein as this output voltage (UA) not
Reach a lower threshold (U2) time, for triggering this control signal (S of this security functionHS, SLS) this converter of deexcitation (3)
Operation, and
-by this output voltage (UA) it is that the semiconductor switch (V) of this converter circuit (4) produces one and activates signal (ST),
This switch periods it is connected to this input voltage (UEOn), wherein exceed maximum (U when described output voltageMax) time, this is defeated
Go out voltage (UA) it is reduced to set point magnitude of voltage (Us)。
2. the equipment (1) being used for implementing the method for claim 1,
-there is a converter circuit (4), this converter circuit has a transformator (T), and this transformator has on master
One semiconductor switch (V), for from an input voltage (UE) an electric isolution output voltage (U is providedA), and in secondary
There is on side a commutator (D), and
-there is an open loop and/or the closed-loop control device (6) being connected to this commutator (D) downstream, as this output voltage (UA)
Exceed maximum (UMax) time, described control device is this control signal that this converter (3) produces for triggering this security function
(SHS, SLS), and produce this actuating signal (S for this semiconductor switch (V)T)。
3. equipment (1) as claimed in claim 2,
Wherein
This open loop and/or closed-loop control device (6) have a comparator and threshold switch functor (7,8), this converter electricity
This output voltage (U on road (4)A) it is applied to this comparator and threshold switch functor, for swashing for this semiconductor switch (V)
It serves somebody right activates signal (ST)。
4. equipment (1) as claimed in claim 2,
Wherein
This open loop and/or closed-loop control device (6) include a set point/actual value comparator (9) and set described in being connected to
One pulse-modulator (10) in fixed point/actual value comparator downstream, for this output voltage based on this converter circuit (4)
(UA) and a set point magnitude of voltage (Us) a deviation operating frequency of this semiconductor switch (V) is adjusted.
5. equipment (1) as claimed in claim 2,
Wherein
This semiconductor switch (V) is galvanically isolated element (11) and this open loop and/or closed-loop control device in control side by one
(6) connect.
6. equipment (1) as claimed in claim 2,
Wherein
A Schmidt trigger is distributed as threshold switch (5), this converter to this open loop and/or closed-loop control device (6)
This output voltage (U of circuit (4)A) it is supplied to this threshold switch, control letter for producing this binary system for this converter (3)
Number (SHS, SLS)。
7. equipment (1) as claimed in claim 2,
Wherein
This semiconductor switch (V1, V2) forms a series electrical together with the armature winding (LP1, LP2) of this transformator (T1, T2)
Road, this input voltage (UE) be applied on this series circuit.
8. equipment (1) as claimed in claim 7,
Wherein
One buffer capacitor (C11, C12) is connected in parallel with this series circuit, and this semiconductor switch (V1, V2) is controlling input
Side is connected with described capacitor by the phototransistor (F1, F2) of a photo-coupler (11).
9. equipment (1) as claimed in claim 2,
Wherein
The function of this open loop and/or closed-loop control device (6) is integrated in the microprocessor.
10. equipment (1) as claimed in claim 9,
It is characterized by
It is provided with the multi-microprocessor of redundancy, the input (E of these microprocessors11, E21) receive this converter circuit (4)
Output voltage (UA), and for the output voltage (U of this converter circuit (4)AInput (the E of described microprocessor for)11,
E21) intercouple.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP12007295.4 | 2012-10-24 | ||
| EP12007295.4A EP2725435B1 (en) | 2012-10-24 | 2012-10-24 | Control of a security feature of an electric machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103780062A CN103780062A (en) | 2014-05-07 |
| CN103780062B true CN103780062B (en) | 2016-11-30 |
Family
ID=
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6023178A (en) * | 1997-04-09 | 2000-02-08 | Yokogawa Electric Corporation | Pulse width control IC circuit and switching power supply unit |
| CN101937191A (en) * | 2009-06-26 | 2011-01-05 | 富士电机控股株式会社 | Safety feature and power converter |
| TW201106604A (en) * | 2009-03-25 | 2011-02-16 | Powergetics Inc | Bidirectional energy converter |
| CN102185510A (en) * | 2011-05-09 | 2011-09-14 | 张承臣 | Safety protective power system |
| EP2495869A2 (en) * | 2011-02-10 | 2012-09-05 | Lenze Automation GmbH | Control device with safe-torque-off function for an electric motor |
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6023178A (en) * | 1997-04-09 | 2000-02-08 | Yokogawa Electric Corporation | Pulse width control IC circuit and switching power supply unit |
| TW201106604A (en) * | 2009-03-25 | 2011-02-16 | Powergetics Inc | Bidirectional energy converter |
| CN101937191A (en) * | 2009-06-26 | 2011-01-05 | 富士电机控股株式会社 | Safety feature and power converter |
| EP2495869A2 (en) * | 2011-02-10 | 2012-09-05 | Lenze Automation GmbH | Control device with safe-torque-off function for an electric motor |
| CN102185510A (en) * | 2011-05-09 | 2011-09-14 | 张承臣 | Safety protective power system |
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