CN207884588U - Safe torque breaking circuit - Google Patents
Safe torque breaking circuit Download PDFInfo
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- CN207884588U CN207884588U CN201820004788.7U CN201820004788U CN207884588U CN 207884588 U CN207884588 U CN 207884588U CN 201820004788 U CN201820004788 U CN 201820004788U CN 207884588 U CN207884588 U CN 207884588U
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Abstract
A kind of safe torque shutdown (STO) circuit is disclosed, including：Drive control device, for generating driving control signal；Driving circuit receives driving control signal via transmission path from drive control device, and for driving load according to driving control signal；Driving power circuit is used for drive circuitry；First optocoupler, including the first primary side and the first secondary side；Second optocoupler, including the second primary side and the second secondary side, wherein the second primary side is connected in series with the first primary side.Control signal of the output on the first secondary side as driving power circuit, whether work for controlling driving power circuit.Transmission path include can switching device, the output on the second secondary side as this can switching device control signal, for controlling its break-make.Then, when STO is enabled, the supply of electric power of driving circuit and driving control signal supply can be simultaneously severed, and improve the reliability of circuit.
Description
Technical field
This disclosure relates to electronic circuit field, more particularly, to safe torque shutdown (STO) electricity for improving performance
Road.
Background technology
In order to reliably realize that safe torque turns off (STO) function, STO circuits are configured usually using binary channels.Specifically, two
The road channels STO can control on the igbt (IGBT) as driving part underarm driving power to realize respectively
STO functions.After driving power is disconnected, the output of driving power will not directly become zero, but there are one slowly declined for meeting
Journey.If still sending drive signal to IGBT at this time, IGBT may be still within working condition, and work whithin a period of time
In the state of making in driving voltage deficiency.This may cause IGBT to overheat and fail.
In addition, considering for cost and electrical safety, optocoupler is used in STO circuits.In general, requiring system in low-security
In system, STO is seldom triggered.That is, the primary side (light emitting diode, LED) of optocoupler is in normal open shape within the extremely long period
State.This will seriously reduce the service life of optocoupler.In addition, since the LED for turning off optocoupler almost without chance carries out efficient diagnosis, from
And it may get stuck (stuck-at) failure and influence safety.In general, the reliability of optocoupler and not bery it is high (with other types every
It is compared from component).Therefore, in high security requirement system, whether optocoupler is worked normally carry out diagnosis be important.
Utility model content
In view of this, the purpose of the disclosure is to provide a kind of safe torque shutdown for having and improving performance at least partly
(STO) circuit.
In accordance with an embodiment of the present disclosure, a kind of STO circuits are provided, including：Drive control device, for generating drive control
Control signal；Driving circuit receives driving control signal via transmission path from drive control device, and for according to drive control
Signal loads to drive；Driving power circuit is used for drive circuitry；First optocoupler, including the first primary side and the first pair
Side；Second optocoupler, including the second primary side and the second secondary side, wherein the second primary side is connected in series with the first primary side, wherein first is secondary
The control signal of the output as driving power circuit on side, whether work for controlling driving power circuit, wherein the biography
Defeated path include can switching device, the output on the second secondary side as this can switching device control signal, for controlling its break-make.
In accordance with an embodiment of the present disclosure, in binary channels STO circuits, the primary side of the first optocoupler and the second optocoupler is using series connection
Connection type, rather than in traditional dual channel STO circuits two channels the independently arranged configuration of optocoupler.Since this series connection connects
Connect mode, the STO signals in any channel are enabled in the case of (be usually low level effectively or open circuit), the channels two-way STO
STO can be triggered.
In accordance with an embodiment of the present disclosure, in secondary side side, two channels STO can control driving power circuit to drive respectively
The power supply of dynamic circuit and drive control device are transmitted to the driving control signal of driving circuit.Then, when STO is triggered, to drive
The power supply of dynamic circuit and the supply of driving control signal can be cut off.As a result, it is ensured that the reliable turn-off of driving circuit is kept away
Exempt from driving circuit power decline during due to receive driving control signal and it is in running order under, and therefore can be to avoid
IGBT is due to working in the state of driving voltage deficiency and simultaneously possible explosion of generating heat.
In accordance with an embodiment of the present disclosure, the first primary side and the second primary side can be connected in series to realize the first STO signals
With the level "AND" logic of both the 2nd STO signals.For example, the anode after the first primary side and the series connection of the second primary side can receive the
One STO signals, and the cathode after the first primary side and the series connection of the second primary side can be grounded by switching device, the control of switching device
Terminal is controlled by the 2nd STO signals.In this way, when any of the first STO signals and the 2nd STO signals are enabled, first is former
The series circuit of side and the second primary side can disconnect.
In accordance with an embodiment of the present disclosure, the output on the first secondary side can be connected to control driving power circuit for circuit
Diameter, the first secondary side can be connected to disconnect the supply path when STO functions are enabled.In this way, when triggering STO, drive
The power supply of dynamic power circuit can disconnect, and therefore can disconnect power supply of the driving power circuit to driving circuit.
In accordance with an embodiment of the present disclosure, the output on the second secondary side can be connected to control can switching device for circuit
Diameter, the second secondary side are connected to disconnect the supply path when STO functions are enabled.In this way, when triggering STO, it can break-make
The power supply of device can disconnect, and therefore can switching device can disconnect, to disconnect to from drive control device to driving circuit
The transmission path of driving control signal is provided, and has therefore cut off to the driving control signal of driving circuit and has supplied.Show at one
Example in, can switching device may include third optocoupler, above-mentioned supply path can be connected to the anode of the primary side of third optocoupler, and
Driving control signal can be connected to the cathode of the primary side of third optocoupler.
In accordance with an embodiment of the present disclosure, STO circuits can also include：Primary side on-off control circuit is connected to the first primary side
With the tandem paths of the second primary side, the tandem paths is turned on and off for periodical；And be respectively connected to the first secondary side and
Second it is secondary while first it is secondary while filter circuit and the second secondary side filter circuit, it is low that each pair side filter circuit is configured as cutoff frequency
In the low-pass filter circuit of the periodical break-make frequency for the tandem paths that primary side on-off control circuit is controlled.
From in routine techniques normal work when optocoupler primary side keep normal open state it is different, according to the implementation of the disclosure
Example, can be such that the primary side of optocoupler discontinuously connects, that is, in turning on and off the pattern to alternate.In this way, optocoupler can be reduced
Duration is connected, to extend the service life of optocoupler.
In accordance with an embodiment of the present disclosure, primary side on-off control circuit may include：It is connected to the first primary side and the second primary side
Tandem paths in switching device；And it is connected to the oscillator of the control terminal of switching device.It in this way, can be with
Low cost, the periodical break-make for realizing to low complex degree primary side.
In accordance with an embodiment of the present disclosure, oscillator can receive STO signals as its power supply.In this way, when triggering STO,
The power supply of oscillator can disconnect, and therefore stop oscillation.
In accordance with an embodiment of the present disclosure, STO circuits can also include：Diagnostic circuit, the output for monitoring the first secondary side
And its filtered output and the output on the second secondary side and its filtered output.
Description of the drawings
By referring to the drawings to the description of the embodiment of the present disclosure, the above-mentioned and other purposes of the disclosure, feature and
Advantage will be apparent from, in the accompanying drawings：
Fig. 1 diagrammatically illustrates the block diagram of safe torque shutdown (STO) circuit；
Fig. 2 diagrammatically illustrates the block diagram of the STO circuits according to the embodiment of the present disclosure；
Fig. 3 diagrammatically illustrates the circuit diagram of the STO circuits according to the embodiment of the present disclosure；
Fig. 4 diagrammatically illustrates the circuit diagram of the STO circuits according to another embodiment of the disclosure.
Through attached drawing, same or analogous reference numeral indicates same or analogous component.
Specific implementation mode
Hereinafter, will be described with reference to the accompanying drawings embodiment of the disclosure.However, it should be understood that these descriptions are only exemplary
, and it is not intended to limit the scope of the present disclosure.In addition, in the following description, descriptions of well-known structures and technologies are omitted, with
Avoid unnecessarily obscuring the concept of the disclosure.
Term as used herein is not intended to limit the disclosure just for the sake of description specific embodiment.Used here as
Word " one ", " one (kind) " and "the" etc. also should include " multiple ", " a variety of " the meaning, unless in addition context clearly refers to
Go out.In addition, the terms "include", "comprise" as used herein etc. show the presence of the feature, step, operation and/or component,
But it is not excluded that other one or more features of presence or addition, step, operation or component.
There are all terms (including technical and scientific term) as used herein those skilled in the art to be generally understood
Meaning, unless otherwise defined.It should be noted that term used herein should be interpreted that with consistent with the context of this specification
Meaning, without should by idealization or it is excessively mechanical in a manner of explain.
Unless otherwise expressly stated, the numerical parameter otherwise in this specification and appended claims is approximation, can
According to the required characteristic changing as obtained by content of this disclosure.Specifically, all be used in specification and claim
Indicate the number of content, reaction condition of composition etc., it is thus understood that modified by the term of " about " in all situations.
Under normal circumstances, the meaning expressed refers to comprising specific quantity in some embodiments such as ± 10% or more or less
Variation.
The words such as the ordinal number such as " first ", " second ", " third " used in specification and claim, to modify phase
The element answered, itself, which does not represent the element, any ordinal number, do not represent yet a certain element and another element sequence or
It is the sequence or its importance in manufacturing method.The use of ordinal number is only used for enabling the element and separately with certain name
One element with identical name can make clear differentiation.
Fig. 1 diagrammatically illustrates the block diagram of safe torque shutdown (STO) circuit.
As shown in Figure 1, STO circuits 100 can be divided into the low pressure side (for example, protection extra low voltage, PELV) and high-pressure side.It is low
Pressure side relates generally to low-voltage, such as various control signals；And high-pressure side relates generally to high voltage, such as to load (for example, electricity
Machine) power supply.For electrical security, between low-pressure side and high-pressure side, electric isolating part such as optocoupler 101 is set.Optocoupler 101
On the one hand the electrical isolation between low-pressure side and high-pressure side may be implemented, on the other hand the control of low-pressure side can be transmitted to height
Press side (optically).
Specifically, optocoupler 101 may include primary side 101P and pair side 101S.Primary side 101P can be light emitting diode
(LED) form, the on or off according to the STO signals received at signal input part.Usually, STO signals are in height
It is engineering noise state when level (for example, about 24V), that is, indication motor runs well without turning off；And in non-high level (example
Such as, low-voltage such as 0V or open circuit) when be " effective " state, that is, instruction turn off motor.Here, so-called " high level ", referring to can
So that the voltage that the LED of the primary side 101P of optocoupler 101 is effectively connected；And " non-high level ", it is the primary side 101P for instigating optocoupler 101
LED keep cut-off voltage.For example, (voltage for being added in the both ends LED is caused to be higher than the conducting of LED when STO signals are high level
Voltage) when, LED can be connected and be shone with this；And when STO signals are enabled (for example, low level or open circuit), LED can be with
Cut-off.Secondary side 101S can be the form of triode, and the optical signal that the LED of primary side 101P is sent out may be used as its base signal.
More specifically, when concurrent light is connected in the LED of primary side 101P, the triode of secondary side 101S can be connected；And when primary side 101P's
When LED cut-offs do not send out light, the triode of secondary side 101S can end.
Therefore, secondary side 101S can be turned on and off according to the STO signals at signal input part.Secondary side 101S's is this
On/off can control the power supply of driving power circuit 103.For example, the on/off of pair side 101S can control driving power circuit
103 outside power supplies are respectively turned on/are turned off.Then, the driving circuit 105 being powered by driving power circuit 103 can be with
(the feelings of unpowered that correspondingly worked and (have the case where power supply) or be stopped based on the STO signals at signal input part
Condition).
Driving circuit 105 can be operated using the electric power supplied by driving power circuit 103.Specifically, driving electricity
Driving control signal (rotation/stopping, the rotating speed for controlling motor that road 105 can be provided according to drive control circuit 107
Deng for example, pulse width modulates (PWM) signal), to motor output drive signal, operated with driving motor.In general, driving control
The drive signal such as pwm signal that circuit 107 processed is provided is low-voltage (for example, about 3.3V).Driving circuit 105 can be utilized and be driven
The power supply of dynamic power circuit 103, the drive signal of output HIGH voltage (for example, about 20V).Drive signal and driving control signal phase
It corresponds to, for example, the pwm signal of same waveform.
By switching device such as igbt (IGBT), driving torque can be provided to motor.For three
6 IGBT, high side and each three of downside can be usually arranged in phase motor.The drive signal that motor-drive circuit 105 exports can be with
It is coupled to the grid of IGBT, to control the break-make of IGBT.Correspondingly, drive control circuit 107 is exportable for this 6 IGBT's
6 tunnel driving control signal such as pwm signals.Driving circuit 105 may include the high side for being directed to high side IGBT and downside IGBT respectively
Driver and low side driver, they receive corresponding 3 tunnel driving control signal respectively, and export and be directed to the 3 of corresponding 3 IGBT
Road (grid) drive signal.By the duty ratio of pwm signal, the rotating speed of motor can be adjusted.
In the example of fig. 1, the single channels STO are shown.However, it is possible to which double channels STO are arranged.In general, this two-way STO
Channel is respectively set, to form redundant configuration.For example, can be used for controlling the high-side driver for high side IGBT all the way,
Another way can be used for controlling the low side driver for downside IGBT.It is every to receive STO signals respectively all the way.When any road
STO signals when being enabled, corresponding driver can be powered down, to stop driving corresponding high side or downside IGBT, and
So that motor is stopped, STO is realized.
But as described in the background section, when STO signals are enabled, driving power circuit 103 is to driving circuit
Power supply can't stop immediately, but there may be the processes of decline.In the process, if drive control circuit 107 is still protected
It holds to 105 output driving of driving circuit and controls signal, then IGBT may be driven in the state of driving voltage deficiency to mistake
Heat.
Fig. 2 diagrammatically illustrates the block diagram of the STO circuits according to the embodiment of the present disclosure.
As shown in Fig. 2, there are STO circuits 200 double channels STO to be arranged according to this embodiment, it can be in response to the first STO
Signal STO1 and the 2nd STO signals STO2 and act.Specifically, STO circuits 200 include two optocouplers：First optocoupler 201-1 and
Second optocoupler 202-2.Each optocoupler is respectively provided with respective primary side 201P-1,201P-2 and secondary side 201S-1,201S-2.
In accordance with an embodiment of the present disclosure, the first optocoupler 201-1 and respective primary side 201P-1 of the second optocoupler 202-2 and
201P-2 is serially connected.Being adapted to conventional STO circuits, (when any STO signals are enabled, the primary side of corresponding optocoupler is closed
It is disconnected), it is set as being connected in series with for primary side 201P-1 and 201P-2 of the first optocoupler 201-1 and the second optocoupler 202-2 to work as two-way
When any STO signals are enabled in STO signals (STO1, STO2), the primary side of two optocouplers can turn off (due to their series connection
Connection type).Therefore, this is connected in series with the level "AND" logic for realizing both two-way STO signals (STO1, STO2).This field
There are various ways to design this level AND logic circuit, and an example is shown in which in Fig. 2.
As shown in Fig. 2, the first STO signals STO1 can be connected to the anode of the primary side 201P-1 of the first optocoupler 201-1, make
The power supply being connected in series with for primary side.In addition, the cathode of the primary side 201P-2 of the second optocoupler 201-2 passes through 209 (example of switching device
Such as, transistor) ground connection, and the control terminal (for example, gate terminal of transistor) of switching device 209 can be controlled by second
(for example, the 2nd STO signals STO2 of high level makes switching device 209 connect, and low level 2nd STO believes STO signals STO2
Number STO2 makes switching device 209 turn off).That is, the 2nd STO signals STO2 can control the logical of the earth-return circuit that primary side is connected in series with
It is disconnected.When the first STO signals STO1 and the 2nd STO signals STO2 are not enabled (being high level such as 24V), the first optocoupler
The primary side 201P-1's and 201P-2 of 201-1 and the second optocoupler 202-2 is connected in series to form access.As the first STO signals STO1
With any of the 2nd STO signals STO2 be enabled (low level or open circuit) when, or the confession that then primary side is connected in series with is electrically disconnected
(the 2nd STO signals STO2 is made for the earth-return circuit disconnection that (the first STO signals STO1 is enabled) or primary side are connected in series with
Can).Then, the primary side 201P-1 and 201P-2 of the first optocoupler 201-1 and the second optocoupler 202-2 are connected in series with open circuit.
In accordance with an embodiment of the present disclosure, bilateral crosses a channel in STO configurations (for example, opposite with the first optocoupler 201-1
The channel answered, hereinafter referred to as " the first channels STO ") it can be used for controlling confession of the driving power circuit 203 to driving circuit 205
Electricity, and another channel (for example, channel corresponding with the first optocoupler 201-2, hereinafter referred to as " the 2nd channels STO ") can be used
In supply of the control drive control circuit 207 to the driving control signal of driving circuit 205.
First channels STO are similar to the STO channels operations for combining Fig. 1 descriptions, in response to the secondary side of the first optocoupler 201-1
The output of 201S-1, control driving power circuit 203 are selectively powered to driving circuit 205.Specifically, when any STO believes
When number being enabled, as described above, the primary side of two optocouplers is turned off.Then, the secondary side 201S-1 cut-offs of the first optocoupler 201-1.
In response to the output (instruction cut-off) of the secondary side 201S-1 of the first optocoupler 201-1, driving power circuit 203 can stop to driving
Circuit 205 is powered.For example, driving power circuit 203 itself can be stopped, to stop power supply outward.In this case,
Such as first the output of secondary side 201S-1 of optocoupler 201-1 can connect the supply path of driving power circuit 203 in order to control, should
Supply path can be disconnected in response to the cut-off of secondary side 201S-1 (for example, by the way that switching device is arranged in supply path, and
Switching device is controlled by the output of secondary side 201S-1), to which driving power circuit 203 can stop work due to missing power supply
Make.
2nd channels STO can control drive control circuit in response to the output of the secondary side 201S-2 of the second optocoupler 201-2
207 selectively provide driving control signal to driving circuit 205.Specifically, when STO signals are not enabled (at this point, second
The secondary side 201S-2 of optocoupler 201-2 is connected), control drive control circuit 207 provides driving control signal to driving circuit 205；
And when any STO signals are enabled (at this point, secondary side 201S-2 cut-offs of the second optocoupler 201-2), control drive control circuit
207 do not provide driving control signal to driving circuit 205.For example, this can be by by the secondary side 201S-2 of the second optocoupler 201-2
Output be connected to certain Single port of drive control circuit 207, and drive control circuit 207 is programmed in response at the port
Input selection generate or stop generating driving control signal and realize.
It, can be in drive control circuit 207 and driving circuit in order to change the design of drive control circuit 207 less as possible
Setting can switching device 211 in transmission path between 205.The output of the secondary side 201S-2 of second optocoupler 201-2 can conduct
This can switching device control signal, its break-make is controlled, to respectively turn on or disconnect the transmission path of driving control signal.
Specifically, when STO is not enabled, the secondary side 201S-2 of the second optocoupler 201-2 is connected, output should control can switching device connect
It is logical；And when STO is enabled, the secondary side 201S-2 of the second optocoupler 201-2 ends, and output should control can switching device shutdown.
For example, the output of the secondary side 201S-2 of the second optocoupler 201-2 can be connected to control can switching device 211 supply path,
The supply path can be disconnected in response to the cut-off of secondary side 201S-2 (for example, by the way that switching device is arranged in supply path,
And switching device is controlled by the output of secondary side 201S-2).
About driving power circuit 203, driving circuit 205 and drive control circuit 207, may refer to above in association with Fig. 1
Description, be not repeated herein.
Fig. 3 diagrammatically illustrates the circuit diagram of the STO circuits according to the embodiment of the present disclosure.
As shown in figure 3, STO circuits 300 are equally the double channels STO settings, including the first optocoupler according to this embodiment
301-1 (U1) and the second optocoupler 301-2 (U2), their primary side LED are connected in series with as described above.In addition, in order to realize that STO believes
Number level "AND" logic, this be connected in series with by switching device 309 (for example, NPN transistor) be grounded.First STO signals
STO1 can be connected to the anode of the primary side LED of the first optocoupler 301-1, and the 2nd STO signals STO2 can be connected to derailing switch
The control terminal (for example, gate terminal) of part 309.In this example, it at the signal input part of STO1 and STO2, is separately connected
There are the zener diode D1 and D2 of such as 15V.By zener diode D1 and D2, stable STO trigger gates can be provided and rationed the power supply
Pressure.As long as example, when any of STO1 and STO2 are less than 15V, you can ensure that STO is reliably enabled.
One end of the secondary side triode of first optocoupler 301-1 is pulled to supply voltage Vdd, other end ground connection.In addition,
In this example, it is connected with low-pass filter circuit at the output of secondary side triode, is exported in order to provide stablizing.In this example,
It shows the RC low-pass filter circuits being made of resistor R3 and capacitor C1, it is defeated that filtering is provided at the both ends of capacitor C1
Go out.In addition, at the both ends of capacitor C1, resistor R1 can also be connected, in order to provide the discharge path (resistor of capacitor C1
R1 is equivalent to the load of RC low-pass filter circuits).Those skilled in the art will know that various low-pass filter circuits, electric shown in Fig. 3
Road is only an example.
The secondary side triode of second optocoupler 301-2 is connected similarly, and one end is pulled to supply voltage FVcc, the other end
Ground connection.Similarly, low-pass filter circuit can be connected at the output of secondary side triode, such as by resistor R4 and capacitor
The RC low-pass filter circuits that C2 is constituted, and resistor R2 can be connected to the both ends capacitor C2 as load, details are not described herein.
The filtering output on the secondary side of the first optocoupler 301-1 can control confession of the driving power circuit 303 to driving circuit 305
Electricity.In this example, driving power circuit 303 is, for example, the pulse power, and the S_Vdd that powers all the way is received from supply voltage Vdd.
In from supply voltage Vdd to the supply path between driving power circuit 303, be provided with switching device Q1 (for example,
PMOSFET).The filtering output on secondary side is connected to the control terminal of switching device Q1, to control connection/pass of switching device Q1
It is disconnected.Specifically, when switching device Q1 is connected, from supply voltage Vdd to the pulse power 303 provide power supply S_Vdd (close to
Vdd), to which the pulse power 303 works.And when switching device Q1 ends, between supply voltage Vdd and the pulse power 303
Supply path is cut off, to which the pulse power 303 is stopped due to lacking power supply S_Vdd, that is, has cut off driving power electricity
Road.In this example, the output of filter circuit may be used as the gate source voltage of switching device Q1, thus controls switching device Q1 and leads
Logical/cut-off.
The filtering output on the secondary side of the second optocoupler 301-2 can control drive of the drive control circuit 307 to driving circuit 305
Dynamic control signal supply.In this example, the driving control signal between drive control circuit 307 and driving circuit 305 passes
Optocoupler 311 is set in defeated path.On the one hand, the optocoupler 311 can play the role of it is above-mentioned can switching device；On the other hand, also
It can play the role of electrical isolation.Therefore, it realizes break-make control compared to common switching device is used, uses light herein
Coupling 311 is advantageous.The anode of the primary side LED of optocoupler 311 receives the S_FVcc that powers all the way from supply voltage FVcc.From power supply
In supply path between the anode of voltage FVcc to the primary side LED of optocoupler 311, be provided with switching device Q2 (for example,
PMOSFET).The filtering output on the secondary side of the second optocoupler 301-2 is connected to the control terminal of switching device Q2, to control derailing switch
The ON/OFF of part Q2.Specifically, when switching device Q2 is connected, from supply voltage FVcc to the primary side LED's of optocoupler 311
Anode provides power supply S_FVcc (close to FVcc), can be corresponding based on driving control signal to the primary side LED of optocoupler 311
Ground acts, the corresponding driving control signal of output at its secondary side.When switching device Q2 ends, supply voltage FVcc and light
Supply path between the anode of the primary side LED of coupling 311 is cut off, so that the primary side LED of optocoupler 311 is due to lacking power supply S_
FVcc and be stopped, that is, cut off the transmission path of driving control signal.In this example, the output of filter circuit can be with
Thus gate source voltage as switching device Q2 controls switching device Q2 conduction and cut-offs.
In this example, driving control signal is input at the cathode of primary side LED of optocoupler 311.When drive control is believed
When number (for example, pwm signal) is logically high, the primary side LED of optocoupler 311 can end, correspondingly the secondary side triode of optocoupler 311
Cut-off；And when driving control signal is logic low, the primary side LED of optocoupler 311 can be connected, correspondingly the secondary side of optocoupler 311
Triode ON.Optocoupler 311 can for example be connected as push-pull configuration, to make output at secondary side and driving control signal
Logic is consistent.In figure 3, it is not illustrated in detail the connection type of the secondary side triode of optocoupler 311.
In this respect it is to be noted that it is corresponding with driving number (for example, 6) of IGBT, 6 tunnel drive controls can be provided
Signal, and 6 optocouplers 311 are provided.
At normal work (for example, being+24V at STO1 and STO2), the primary side LED of the first optocoupler U1 and the second optocoupler U2
It is both turned on, correspondingly their own secondary side triode is both turned on.In the channels first/second STO, there are capacitor C1/C2
The power path constituted with resistor R3/R4, then charges to capacitor C1/C2.When on the voltage at the both ends capacitor C1/C2
When rising above the threshold voltage of switching device Q1/Q2, switching device Q1/Q2 can be made to be connected.Since switching device Q1 is connected, from
And driving power circuit 303 can receive power supply S_Vdd, and work to provide power supply to driving circuit 305.In addition, by
It is connected in switching device Q2, to which the anode of the primary side LED of optocoupler 311 can receive power supply S_FVcc, on secondary side three
Output driving controls signal at pole pipe.Then, driving circuit 305 can utilize the power supply from driving power circuit 303, according to
Via driving control signal of the optocoupler 311 from drive control circuit 307, high side IGBT/ downside IGBT on or off is controlled.
When STO is triggered (for example, any of STO1 and STO2 are enabled), the first optocoupler U1 and the second optocoupler U2's
Primary side LED is turned off, and correspondingly their own secondary side triode is turned off.In first/second STO branches, capacitor C1/
C2 can be discharged by resistor R1/R2.When the voltage at the both ends capacitor C1/C2 drops to less than switching device Q1/Q2's
When threshold voltage, switching device Q1/Q2 can be made to end.Since switching device Q1 ends, driving power circuit 303 can no longer receive
To power supply S_Vdd, to be stopped, and therefore cannot power to driving circuit 305.Correspondingly, driving circuit 305 can stop
It only works, so as to turn off the torque of motor.In addition, since switching device Q2 ends, the anode of the primary side LED of optocoupler 311
Power supply S_FVcc can be no longer received, to which driving control signal cannot be transmitted to driving circuit 305.Thus it is possible to avoid
IGBT is still within working condition during power supply declines.
In accordance with an embodiment of the present disclosure, STO circuits 300 can also include diagnostic circuit 313.As shown in figure 3, diagnostic circuit
313 can monitor supply voltage Vdd, FVcc (voltage at A, B point) and power supply S_Vdd, S_FVcc (electricity at C, D point
Pressure).It, can be to drive control circuit when abnormal (for example, deviateing normal value exceeds preset range) occur in any of they
307 send out alarm signal.Drive control circuit 307 can stop producing driving control signal based on alarm signal.
In general, seldom will appear effective STO signals in system, that is, motor is substantially always maintained at operating.Such case
Under, the primary side LED of optocoupler U1 and U2 almost normal open, this largely effects on the service life of optocoupler.With in routine techniques normal work when
The primary side of optocoupler keeps normal open state different, in accordance with an embodiment of the present disclosure, the primary side of optocoupler can be made discontinuously to connect, that is, place
In turning on and off the pattern to alternate.For example, this can be by connecting primary side break-make control in the primary side tandem paths to optocoupler
Circuit processed is realized.The primary side tandem paths that primary side on-off control circuit can control optocoupler turns on and off.In this way, can drop
The connection duration of low optocoupler, to extend the service life of optocoupler.It, also can be correspondingly at secondary side due to this break-make switching at primary side
There is break-make switching.But in normal work, stable power supply should be kept, this requires secondary side to have stable output.In order to
Stabilization signal is exported from the secondary side that break-make switches occurs, low-pass filter circuit can be increased at the output on secondary side.The low pass filtered
The cutoff frequency of wave circuit could be provided as the break-make frequency less than primary side/pair side, can filter out in this way since break-make switches and
Caused high frequency characteristics, and export substantially stable signal.
Fig. 4 diagrammatically illustrates the circuit diagram of the STO circuits according to another embodiment of the disclosure.
As shown in figure 4, STO circuits 400 and combining STO circuits 300 shown in Fig. 3 substantially phase according to this embodiment
Together, the difference is that：The primary side LED of optocoupler U1 and U2 be connected in series in path be added switching device 309 (for example,
NMOSFET Q3).By periodical on and off switching device Q3, the period that primary side LED is connected in series with path may be implemented
Property turns on and off.
The break-make of switching device Q3 is controlled there are various ways.For example, can simply be realized using oscillator 315
The break-make of switching device Q3 controls.Specifically, oscillator 315 can export the oscillator signal vibrated between low and high level, should
Oscillator signal can be coupled to the grid of switching device Q3.It can be advantageous to provide oscillation using a STO signals such as STO2
The power supply of device 315.STO2 can be applied to oscillator 315 by zener diode D3, to be provided steadily to oscillator 315
Power supply.
At normal work (for example, being+24V at STO1 and STO2), during switching device Q3 conductings, the first optocoupler U1
It is both turned on the primary side LED of the second optocoupler U2, correspondingly their own secondary side triode is both turned on.Such case and above-mentioned knot
The case where when normal work of conjunction Fig. 3 descriptions, is identical.Here, can the resistance value of resistor R3/R4 be set as smaller so that electricity
The charging process of container C1/C2 is relatively fast, can quickly rise to be higher than derailing switch to the voltage at the both ends capacitor C1/C2
The threshold voltage of part Q1/Q2, so that switching device Q1/Q2 conductings.
In addition, at normal work (for example, being+24V at STO1 and STO2), during switching device Q3 cut-offs, first
The primary side LED of optocoupler U1 and the second optocoupler U2 are turned off, and correspondingly their own secondary side triode is turned off.The first/the
In two STO branches, capacitor C1/C2 can be discharged by resistor R1/R2.Here, the resistance value of resistor R1/R2 can be set
Be set to it is larger so that the discharge process of capacitor C1/C2 is relatively slow, for example, in the pair of first/second optocoupler U1/U2
Before side triode is connected and therefore can be charged to capacitor C1/C2 next time, the voltage at the both ends capacitor C1/C2 will not
Drop below the threshold voltage of switching device Q1/Q2.Then, switching device Q1/Q2 still can be held on, and therefore with
Driving motor runs well the above situation in the same manner.
In accordance with an embodiment of the present disclosure, the resistance value of resistor R1/R2 and R3/R4 can be set as resistor R1/R2's
The resistance value of resistance value ratio resistor R3/R4 is greatly to making the charging process of capacitor C1/C2 far faster than discharge process, thus capacitor
The both ends C1/C2 can be always maintained at the voltage of relatively high (threshold voltage for being higher than switching device Q1/Q2).For example, in oscillator
In the case of about 50% duty ratio, the resistance value of resistor R1 can be more than twice of the resistance value of resistor R3, resistor R2
Resistance value can be more than twice of resistance value of resistor R4.
It more generally, can be by cutoff frequency (1/ (the 2 π R of low-pass filter circuit3C1) or 1/ (2 π R4C2)) be set as
Less than the frequency f of primary side break-make.In one example, the capacitance C of capacitor C1/C21/C2Can be 1 μ F, resistor R1/R2
Resistance value R1/R2Can be 2.2k Ω, the resistance value R of resistor R3/R43/R4Can be 330 Ω, break-make frequency f can be 2kHz.
In this way, low-pass filter circuit can filter out the high frequency characteristics in oscillator signal, can be basic to the output of filter circuit
The voltage of upper stabilization.
When STO is triggered (for example, any of STO1 and STO2 are enabled), as described above, the original of optocoupler U1 and U2
Side LED can end.Specifically, when STO1 is enabled, the power supply of primary side LED being connected in series with is disconnected；When STO2 is made
When energy, oscillator 315 stops oscillation (and can export low level or open circuit), to which switching device 309 disconnects.As described above,
In this case the torque of motor can be turned off.
In this example, diagnostic circuit 313 not only monitors the signal at A, B, C, D as described above, also monitors the first optocoupler
U1 it is secondary while export (voltage in figure at E points), the second optocoupler U2 it is secondary while export (voltage in figure at F points).Based on these
Monitoring value can diagnose the state of STO circuits.
For example, when the first optocoupler U1 and the second optocoupler U2 secondary side output be waveform (show oscillator normal oscillation,
And optocoupler works normally), and corresponding power supply S_Vdd and S_FVcc is that (voltage of power supply S_Vdd is enough to drive driving normal value
Circuit 305, the voltage for the S_FVcc that powers are enough to drive the primary side of optocoupler 311) when, diagnostic circuit 313 can determine the first STO branch
Road and the 2nd STO branches are in normal operating conditions, and STO is not enabled.
For another example, when the secondary persistently off state that is in when output shows secondary of the first optocoupler U1 and the second optocoupler U2 (shows
Primary side is likely to be at cut-off state), and corresponding power supply S_Vdd or S_FVcc deviates normal value (for example, power supply S_Vdd missings
Or its undertension, to drive driving circuit 305, the missing for the S_FVcc that powers or its undertension are to drive the original of optocoupler 311
Side) when, diagnostic circuit 313 can determine the first STO branches and the 2nd STO branches are in the state that STO is enabled.
For another example, when the secondary side of the optocoupler (for example, U1) of a STO branch road in the first STO branches and the 2nd STO branches is defeated
It is waveform (showing oscillator normal oscillation, and U1 is worked normally) to go out and corresponding power supply (for example, S_Vdd) has normally
Value, and the optocoupler (for example, U2) of another STO branch road it is secondary while output show pair while be in persistently off state and accordingly
When power supply (for example, S_FVcc) deviates normal value, diagnostic circuit 313 can determine that the optocoupler in another described STO branch loses
Open circuit between effect, such as collector-emitter of secondary side triode.
For another example, when the secondary side of the optocoupler (for example, U1) of a STO branch road in the first STO branches and the 2nd STO branches is defeated
It is waveform (showing oscillator normal oscillation, and U1 is worked normally) to go out and corresponding power supply (for example, S_Vdd) has normally
Value, and the optocoupler (for example, U2) of another STO branch road it is secondary while output show pair while be in the state of being continuously turned on and accordingly
When powering (for example, S_FVcc) with normal value, diagnostic circuit 313 can determine that the optocoupler in another described STO branch loses
Short circuit between effect, such as collector-emitter of secondary side triode.
For another example, when the first optocoupler U1 and the second optocoupler U2 it is secondary while output show the first optocoupler and the second optocoupler it is secondary while it is equal
In the state that is continuously turned on, and when the S_Vdd and S_FVcc that powers has normal value, diagnostic circuit 413 can determine primary side break-make
Failure has occurred in control circuit (for example, oscillator 315 and/or switching device 309).
In situation above, the state at state and the optical coupling secondary edges of S_Vdd and S_FVcc of powering be consistent (that is,
Optical coupling secondary edges provide power supply when being connected, optical coupling secondary edges do not provide power supply when ending).There is likely to be both inconsistent feelings
Condition.
For example, when the first optocoupler U1 it is secondary while output show secondary while be in persistently off state, but the S_ that powers accordingly
When Vdd has normal value, diagnostic circuit 313 can determine that first switch device Q1 breaks down (for example, source and drain is short-circuit).
For another example, when the second optocoupler U2 it is secondary while output show secondary while be in and continue off state, but the S_ that powers accordingly
When FVcc has normal value, diagnostic circuit 313 can determine that second switch device Q2 breaks down (for example, source and drain is short-circuit).
The above diagnosis is all based on the normal situation of supply voltage Vdd and FVcc (voltage at E, F).If both it
One or deviate normal value, then can be determined that corresponding supply voltage Vdd and/or FVcc breaks down.
In addition, diagnostic circuit 313 shown in Fig. 4 is also applied for STO circuits 300 shown in Fig. 3.
In this case, for example, output shows the first optocoupler and the when the secondary side of the first optocoupler U1 and the second optocoupler U2
The secondary side of two optocouplers is in the state of being continuously turned on, and when the S_Vdd and S_FVcc that powers has normal value, and diagnostic circuit 313 can
To determine that the first STO branches and the 2nd STO branches are in normal operating conditions, and STO is not enabled.
For another example, when the secondary of the first optocoupler U1 and the second optocoupler U2 is in lasting off state, and phase when output shows secondary
When the power supply S_Vdd or S_FVcc answered deviates normal value, diagnostic circuit 313 can determine the first STO branches and the 2nd STO branches
The state being enabled in STO.
For another example, when the secondary side of the optocoupler (for example, U1) of a STO branch road in the first STO branches and the 2nd STO branches is defeated
Go out to show that secondary side is in the state that is continuously turned on and corresponding power supply (for example, S_Vdd) has normal value, and another STO branch is on the road
Optocoupler (for example, U2) it is secondary while output show pair while be in continue off state and accordingly power (for example, S_FVcc) partially
When from normal value, diagnostic circuit 313 can determine the failure of the optocoupler in one STO branches, such as the collection of secondary side triode
It is short-circuit between electrode-transmitter pole, or can determine the optocoupler failure in another described STO branch, such as secondary side triode
Collector-emitter between open circuit.
Diagnostic circuit 313 can pass through logical block such as microprocessing unit (MCU) or Complex Programmable Logic Devices
(CPLD) it realizes, and can realize diagnostic logic in a manner of look-up table etc..Of course, it is possible to by discrete parts, with combination
The modes such as logic circuit are realized.The following table 1 diagrammatically illustrates some diagnostic logics.
Table 1
Remarks：OSC. oscillator signal is represented, H represents high level signal, and L represents low level signal, and x represents arbitrary signal
According to the working condition diagnosed, different operations can be carried out.For example, detect STO effective statuses or
When influencing failure (for example, optocoupler failure) of motor operating, diagnostic circuit can send out the signal of instruction system stalls.Example
Such as, diagnostic circuit 313 can indicate that drive control circuit 307 stops output driving control signal.In addition, detect failure but
When motor remains to operating (for example, oscillating circuit failure) by the component for avoiding breaking down, diagnostic circuit can send out finger
Show the signal (can certainly halt system work) for being downgraded to lower security grade.For example, diagnostic circuit 313 can indicate to switch
Device Q3 is in normal open state (in this case, STO2 will not work, and only STO1 works).
In accordance with an embodiment of the present disclosure, the circuit of high safety specification and the circuit of lower security specification can pass through identical electricity
Road plate such as printed circuit board (PCB) is realized, and therefore can be manufactured by identical production line.For high safety specification
Circuit, such as can be produced according to layout shown in Fig. 4.And for the circuit of lower security specification, then it can be by few
It is one or more in installation such as welding diagnosis involved component such as oscillator 315, diagnostic circuit 313 to realize.
Embodiment of the disclosure is described above.But the purpose that these embodiments are merely to illustrate that, and
It is not intended to limit the scope of the present disclosure.Although respectively describing each embodiment above, but it is not intended that each reality
Use cannot be advantageously combined by applying the measure in example.The scope of the present disclosure is limited by appended claims and its equivalent.It does not take off
From the scope of the present disclosure, those skilled in the art can make a variety of alternatives and modifications, these alternatives and modifications should all be fallen at this
Within scope of disclosure.
Claims (10)
1. a kind of safe torque breaking circuit, including：
Drive control device, for generating driving control signal；
Driving circuit receives driving control signal via transmission path from drive control device, and for according to driving control signal
To drive load；
Driving power circuit is used for drive circuitry；
First optocoupler, including the first primary side and the first secondary side；
Second optocoupler, including the second primary side and the second secondary side,
It is characterized in that：
Second primary side is connected in series with the first primary side,
Control signal of the output on the first secondary side as driving power circuit, whether work for controlling driving power circuit,
And
The transmission path include can switching device, the output on the second secondary side as this can switching device control signal, be used for
Control its break-make.
2. safe torque breaking circuit according to claim 1, which is characterized in that the first primary side and the second primary side are connected
It is connected as realizing the level "AND" logic of both the first safe torque cut-off signals and second safe torque cut-off signals.
3. safe torque breaking circuit according to claim 2, which is characterized in that after the first primary side and the series connection of the second primary side
Anode receive the first safe torque cut-off signals, and the first primary side and the second primary side series connection after cathode connect by switching device
The control terminal on ground, switching device is controlled by the second safe torque cut-off signals.
4. safe torque breaking circuit according to claim 1, which is characterized in that the output on the first secondary side is connected to control
The supply path of driving power circuit processed, the first secondary side are connected to disconnect the confession when safe torque turn-off function is enabled
Power path.
5. safe torque breaking circuit according to claim 1, which is characterized in that the output on the second secondary side is connected to control
System can switching device supply path, the second secondary side is connected to disconnect the power supply when safe torque turn-off function is enabled
Path.
6. safe torque breaking circuit according to claim 5, which is characterized in that can switching device include third optocoupler,
The supply path is connected to the anode of the primary side of third optocoupler, and driving control signal is connected to the moon of the primary side of third optocoupler
Pole.
7. safe torque breaking circuit according to claim 1, it is characterised in that further include：
Primary side on-off control circuit is connected to the tandem paths of the first primary side and the second primary side, for periodically turning on and off
The tandem paths；And
Be respectively connected to first it is secondary while and second it is secondary while the first secondary filter circuit when filter circuit and second are secondary, the filter of each pair side
Wave circuit is configured as periodical break-make frequency of the cutoff frequency less than the tandem paths that primary side on-off control circuit is controlled
The low-pass filter circuit of rate.
8. safe torque breaking circuit according to claim 7, which is characterized in that the primary side on-off control circuit packet
It includes：
The switching device being connected in the tandem paths of the first primary side and the second primary side；And
It is connected to the oscillator of the control terminal of switching device.
9. safe torque breaking circuit according to claim 8, which is characterized in that oscillator receives safe torque shutdown letter
Its power supply of number conduct.
10. safe torque breaking circuit according to claim 7, it is characterised in that further include：
Diagnostic circuit, for monitor first it is secondary while output and its filtered output and output and its filter when the second pair
Output after wave.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820004788.7U CN207884588U (en) | 2018-01-02 | 2018-01-02 | Safe torque breaking circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820004788.7U CN207884588U (en) | 2018-01-02 | 2018-01-02 | Safe torque breaking circuit |
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| CN207884588U true CN207884588U (en) | 2018-09-18 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11133770B2 (en) | 2019-06-20 | 2021-09-28 | Delta Electronics, Inc. | Motor drive system and control method therefor |
| CN113965056A (en) * | 2020-07-20 | 2022-01-21 | 浙江海利普电子科技有限公司 | Safe torque turn-off circuit and frequency converter comprising same |
| US11831258B2 (en) | 2020-07-20 | 2023-11-28 | Zhejiang Holip Electronic Technology Co., Ltd. | Safe-Torque-Off (STO) circuit and frequency converter including the same |
| WO2024126546A1 (en) * | 2022-12-15 | 2024-06-20 | Grundfos Holding A/S | Pump device with integrated safe torque off function |
| WO2024126544A1 (en) * | 2022-12-15 | 2024-06-20 | Grundfos Holding A/S | Compact safe torque off circuit for electric motor |
-
2018
- 2018-01-02 CN CN201820004788.7U patent/CN207884588U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11133770B2 (en) | 2019-06-20 | 2021-09-28 | Delta Electronics, Inc. | Motor drive system and control method therefor |
| CN113965056A (en) * | 2020-07-20 | 2022-01-21 | 浙江海利普电子科技有限公司 | Safe torque turn-off circuit and frequency converter comprising same |
| US11831258B2 (en) | 2020-07-20 | 2023-11-28 | Zhejiang Holip Electronic Technology Co., Ltd. | Safe-Torque-Off (STO) circuit and frequency converter including the same |
| WO2024126546A1 (en) * | 2022-12-15 | 2024-06-20 | Grundfos Holding A/S | Pump device with integrated safe torque off function |
| WO2024126544A1 (en) * | 2022-12-15 | 2024-06-20 | Grundfos Holding A/S | Compact safe torque off circuit for electric motor |
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