CN110854830A - STO input circuit for frequency converter, servo system and filter bleeder circuit - Google Patents
STO input circuit for frequency converter, servo system and filter bleeder circuit Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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Abstract
The invention provides an STO input circuit for a frequency converter, the frequency converter, a servo system and a filtering and bleeding circuit. The STO input circuit includes: the filtering and bleeding circuit is coupled with the input end of the frequency converter and is used for filtering clutter input through the input end; a current limiting circuit coupled with the filter bleed circuit for limiting a current; the voltage stabilizing protection circuit is coupled with the current limiting circuit and is used for performing voltage stabilizing protection; and the optical coupling circuit is coupled with the voltage-stabilizing protection circuit and is used for controlling the safe torque of the frequency converter to be turned off. The technical scheme of the invention can effectively avoid unreasonable inhibition on the test pulse transmitted on the channel, and ensure the normal work of the test pulse while inhibiting clutter.
Description
Technical Field
The present invention relates to the field of circuits, and in particular, to an STO input circuit for a frequency converter, a servo system, and a filter bleed-off circuit.
Background
In recent years, in order to prevent accidental starting and accidental occurrence of motors, related requirements on functional safety are provided for products such as frequency converters, servo motor drivers and the like. One such safety function is Safety Torque Off (STO). The safety torque off function prevents torque from being generated when the motor is stopped, making the machine part of a safety system.
In one system, a programmable logic controller is directly coupled to a frequency converter via one or more channels (e.g., STO channels) to control the frequency converter. For example, the on-off output of the programmable logic controller can be used for controlling the start/stop, forward/reverse rotation, inching, rotating speed, addition and subtraction time and the like of the frequency converter, and more complex control requirements can be realized. Generally, in such systems, no test pulse is generally present on the STO channel used.
In another system, however, the programmable logic device is not directly coupled to the transducer, but instead first communicates via one or more channels with a servo drive that communicates with the transducer via one or more other channels. In such a system, in order to detect a fault on a selected channel, a programmable logic device or a servo driver periodically sends a test pulse for detection, thereby achieving a high diagnostic coverage and ensuring high reliability of the system.
In order to avoid that these test pulses cause the STO function in the frequency converter to be triggered or started by mistake, a filter circuit is arranged in the STO input circuit of the frequency converter to eliminate the disturbance of these test pulses. For example, as shown in fig. 1, the STO input circuit includes a filter circuit 110, a current limiting circuit 120, a regulator protection circuit 130, and an optical coupler circuit 140, wherein the filter circuit 110 may be used to suppress interference or glitch input from the outside.
Fig. 3 further illustrates a specific circuit implementation 300 of the STO input circuit. As shown in fig. 3, the filter circuit 110 includes a TVS transistor (i.e., a transient voltage suppression diode) D6 for suppressing surge current, an RC filter circuit (composed of a resistor R2 and a capacitor C3), and a shunt resistor R20. In fig. 3, a TVS tube D6 has one end coupled to the first input terminal and the other end coupled to the second input terminal. One end of a resistor R2 in the RC filter circuit is coupled with the first input end, and the other end of the resistor R2 is coupled with one end of a capacitor C3 and a shunt resistor R20 in the RC filter circuit. The other terminal of the capacitor C3 is coupled to the other terminal of the shunt resistor R20 and to a second input terminal.
Referring next to fig. 5, it shows a graph of the change in the voltage waveform on the input side (i.e., the input side of the STO input circuit) and the output side (i.e., the output side of the STO input circuit) of the filter circuit 110 after receiving the test pulse. As shown in fig. 5, the voltage waveform 510 of the input-side signal (e.g., the voltage across the TVS tube D6) of the filter circuit 110 and the voltage waveform 520 of the output-side signal (e.g., the voltage across the shunt resistor R20) of the filter circuit 110 are changed or suppressed. That is, not only the voltage waveform of the signal passing through the filter circuit in the STO input circuit is suppressed, but also the signal before the STO input circuit is suppressed or affected, and thus cannot be reliably pulled down to the low level. This is often undesirable because the suppression of the signal on the input side of the STO input circuit can cause the servo drive or programmable logic controller associated with the frequency converter to recognize that a fault exists in the circuit or system and report an error.
Therefore, there is a need for an improved STO input circuit that does not cause unnecessary rejection of the input signal in the event that a test pulse is transmitted on the channel.
The above information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
In view of this, according to one aspect of the present invention, there is provided an STO input circuit for a frequency converter, the STO input circuit including: the filter bleeder circuit is coupled with the input end of the frequency converter and used for filtering noise waves input through the input end, and comprises a first resistor, a first capacitor and a first diode, wherein the first diode is conducted in a unidirectional mode and is cut off in a reverse mode so as to ensure that the first capacitor cannot discharge to the input end when the first capacitor discharges, and the second resistor provides a bleeder circuit to the ground, so that when an external test pulse input to the STO input circuit is in a low level state, the level of the input end is also kept in the low level state; a current limiting circuit coupled with the filter bleed circuit for limiting a current; the voltage stabilizing protection circuit is coupled with the current limiting circuit and is used for performing voltage stabilizing protection; and the optical coupling circuit is coupled with the voltage-stabilizing protection circuit and is used for controlling the safe torque of the frequency converter to be turned off.
In the STO input circuit, the filter bleeder circuit further includes a transient voltage suppression diode and a second resistor, wherein one end of the transient voltage suppression diode is coupled to a first input terminal of the input terminals, the other end of the transient voltage suppression diode is coupled to a second input terminal of the input terminals, one end of the second resistor is coupled to the first input terminal, the other end of the second resistor is coupled to one end of the first diode, the other end of the first diode is coupled to one end of the first capacitor, the other end of the first capacitor is coupled to the second input terminal, one end of the first resistor is coupled to the first input terminal, and the other end of the first resistor is coupled to the second input terminal.
In the STO input circuit, an input terminal of the current limiting circuit is coupled to an output terminal of the filter bleeder circuit, and the current limiting circuit includes one or more sub current limiting units.
In the STO input circuit, the sub-current limiting unit includes a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a first transistor, and a second diode, wherein one end of the third resistor is coupled to an input end of the sub-current limiting unit, and the other end of the third resistor is coupled to the fourth resistor and an end of the second diode, the other end of the fourth resistor is coupled with one end of the fifth resistor, the other end of the fifth resistor is coupled with the emitter of the first triode, the base of the first triode is coupled with the other end of the second diode and one end of the sixth resistor, the other end of the sixth resistor is coupled with one end of the seventh resistor, and the other end of the seventh resistor is coupled with the collector of the first triode and used as the output of the sub-current limiting unit.
In the STO input circuit, an input terminal of the regulator protection circuit is coupled to an output terminal of the current limiting circuit, and the voltage stabilization protection circuit comprises a third diode, a fourth diode, a second capacitor, an eighth resistor and a ninth resistor, wherein one end of the second capacitor, one end of the eighth resistor, and one end of the ninth resistor are coupled to a first input end of the input ends of the voltage stabilizing protection circuit, and the other end of the second capacitor, one end of the eighth resistor, and one end of the ninth resistor are coupled to a second input end of the input ends of the voltage stabilizing protection circuit and a second output end of the output ends of the voltage stabilizing protection circuit, one end of the third diode is coupled with the first input end of the voltage stabilizing protection circuit, the other end of the third diode is coupled with one end of the fourth diode, and the other end of the fourth diode is coupled with a first output end of the output ends of the voltage stabilizing protection circuit.
In the STO input circuit, an input end of the optical coupling circuit is coupled with an output end of the voltage stabilization protection circuit, the optical coupling circuit comprises a first optical coupling element and a second optical coupling element, a first end of the first optical coupling element is coupled with a first input end of an input end of the optical coupling circuit, a second end of the first optical coupling element is coupled with a first end of the second optical coupling element, a second end of the second optical coupling element is coupled with a second input end of an input end of the optical coupling circuit, and a third end and a fourth end of the first optical coupling element are coupled with an output end of the optical coupling circuit respectively.
According to another aspect of the present invention, there is provided a frequency converter comprising an STO input circuit as described above.
According to a further aspect of the invention, there is provided a servo system comprising a programmable logic device, a servo drive and a frequency converter as described above, wherein the programmable logic device communicates with the servo drive via one or more channels and the servo drive also communicates with the frequency converter via one or more other channels, wherein the programmable logic device or the servo drive checks whether the channel used is malfunctioning by periodically sending test pulses.
According to a further aspect of the present invention, there is provided a filter bleeder circuit comprising a first resistor, a first capacitor and a first diode, the first diode being unidirectionally conducting and inversely blocking to ensure that the first capacitor cannot discharge to an input terminal of the filter bleeder circuit when the first capacitor discharges, and the second resistor providing a bleeder circuit to ground such that when an external test pulse is low, the level of the input terminal is also kept low. .
In the filter bleeder circuit, the filter bleeder circuit further includes a transient voltage suppression diode and a second resistor, wherein one end of the transient voltage suppression diode is coupled to the first input end of the filter bleeder circuit, the other end of the transient voltage suppression diode is coupled to the second input end of the filter bleeder circuit, one end of the second resistor is coupled to the first input end, the other end of the second resistor is coupled to one end of the first diode, the other end of the first diode is coupled to one end of the first capacitor, the other end of the first capacitor is coupled to the second input end, one end of the first resistor is coupled to the first input end, and the other end of the first resistor is coupled to the second input end.
The technical scheme of the invention can effectively avoid unreasonable inhibition on the test pulse transmitted on the channel, and ensure the normal work of the test pulse while inhibiting clutter.
Other features and advantages of the methods and apparatus of the present invention will be more particularly apparent from or elucidated with reference to the drawings described herein, and the following detailed description of the embodiments used to illustrate certain principles of the invention.
Drawings
FIGS. 1 and 3 are schematic diagrams of the structure of a prior art STO input circuit;
FIGS. 2 and 4 are schematic structural diagrams of an STO input circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of waveforms on the input and output sides of a prior art STO input circuit; and
FIG. 6 is a waveform schematic of the input and output sides of an STO input circuit according to one embodiment of the invention.
Detailed Description
The following description describes specific embodiments of the invention to teach those skilled in the art how to make and use the best mode of the invention. For the purpose of teaching inventive principles, some conventional aspects have been simplified or omitted. Those skilled in the art will appreciate variations from these embodiments that will fall within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Thus, the present invention is not limited to the specific embodiments described below, but only by the claims and their equivalents.
Fig. 2 and 4 are schematic structural diagrams of an STO input circuit according to an embodiment of the present invention. As shown in fig. 2, the STO input circuit includes: a filter bleeder circuit 210, a current limiting circuit 120, a regulated protection circuit 130, and an opto-coupler circuit 140.
In one embodiment, the filter bleed circuit 210 is coupled to an input of the frequency converter for filtering out noise input through the input. The filter bleeder circuit 210 with the input end coupling of converter for the filtering passes through the clutter of input, the filter bleeder circuit includes first resistance, first electric capacity and first diode, thereby first diode one-way switch-on and reverse end guarantee first electric capacity is in when discharging, first electric capacity can't to the input discharges, thereby has guaranteed that filter circuit can not cause the influence to the test pulse signal of external input end. In addition, the second resistor provides a bleed-off to ground so that when the external test pulse input to the STO input circuit is low, the level of the input terminal is also held low. The current limiting circuit 120 is coupled to the filtering and bleeding circuit 210, and is used for limiting the current, i.e. limiting the large current, and protecting the circuit. The regulated protection circuit 130 is coupled to the current limiting circuit 120 for regulated protection. The optical coupling circuit 140 is coupled to the regulated protection circuit 140, and is used to control the safe torque shutdown of the frequency converter.
Referring to FIG. 4, one embodiment of the STO input circuit of FIG. 2 is shown. As shown in fig. 4, the filter bleeder circuit 210 comprises a first resistor R201, a first capacitor C3, a transient voltage suppression diode D6, a second resistor R2, and a first diode D13. In the filter bleeder circuit 210, the first capacitor C3, the first diode D13 and the second resistor R2 form an RC filter, which can be used to filter out noise in the circuit.
With continued reference to fig. 4, one terminal of a transient voltage suppression diode D6 is coupled to a first one of the input terminals and the other terminal of the transient voltage suppression diode D6 is coupled to a second one of the input terminals. In this embodiment, the transient voltage suppression diode D6 functions to suppress surge currents or large currents. One end of a second resistor R2 is coupled to the first input end, the other end of the second resistor R2 is coupled to one end of a first diode D13, the other end of the first diode D13 is coupled to one end of a first capacitor C3, the other end of the first capacitor C3 is coupled to the second input end, one end of a first resistor R201 is coupled to the first input end, and the other end of the first resistor R201 is coupled to the second input end. In this embodiment, the first capacitor C3, the first diode D13, and the second resistor R2 form an RC filter for filtering out noise in the circuit. A first diode D13 is provided in the filter to avoid current feedback to the input that filters the bleed current. In addition, the first resistor R201 provides a bleeding loop to ground, which ensures that the input port level is kept low when the external test pulse is low, and the situation shown in fig. 5, i.e. the signal before the STO input circuit is adversely affected and cannot be reliably pulled down to low level, does not occur.
As shown in fig. 4, an input of current limit circuit 120 is coupled to an output of filter bleed circuit 210. In various embodiments, the current limiting circuit 120 may include one or more sub-current limiting units. In the embodiment of fig. 4, current limiting circuit 120 includes three sub-current limiting units 120-1, 120-2, and 120-3.
In one embodiment, the sub current limiting units 120-1, 120-2, and 120-3 may have the same circuit structure. As shown in fig. 4, the sub current limiting unit 120-1 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first transistor Q1, and a second diode D5. One end of the third resistor R3 is coupled to an input end of the sub current limiting unit 120-1, the other end of the third resistor R3 is coupled to the fourth resistor R4 and one end of the second diode D5, the other end of the fourth resistor R4 is coupled to one end of the fifth resistor R5, the other end of the fifth resistor R5 is coupled to an emitter of the first transistor Q1, a base of the first transistor Q1 is coupled to the other end of the second diode D5 and to one end of the sixth resistor R6, the other end of the sixth resistor R6 is coupled to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is coupled to a collector of the first transistor Q1 and serves as an output of the sub current limiting unit 120-1.
The sub-current limiting unit 120-2 comprises a third resistor R8, a fourth resistor R9, a fifth resistor R10, a sixth resistor R11, a seventh resistor R12, a first transistor Q2 and a second diode D7, wherein one end of the third resistor R8 is coupled to an input terminal of the sub-current limiting unit 120-2, the other end of the third resistor R8 is coupled to the fourth resistor R9 and one end of the second diode D7, the other end of the fourth resistor R9 is coupled to one end of the fifth resistor R10, the other end of the fifth resistor R6329 is coupled to an emitter of the first transistor Q2, a base of the first transistor Q42 is coupled to the other end of the second diode D7 and to one end of the sixth resistor R11, the other end of the sixth resistor R11 is coupled to one end of the seventh resistor R395, and the other end of the seventh resistor R2 is coupled to a collector of the first transistor Q2 as a current limiting unit 120-2.
The sub current limiting unit 120-3 includes a third resistor R13, a fourth resistor R14, a fifth resistor R15, a sixth resistor R16, a seventh resistor R17, a first transistor Q3 and a second diode D8, wherein one end of the third resistor R13 is coupled to an input terminal of the sub current limiting unit 120-3, the other end of the third resistor R13 is coupled to the fourth resistor R14 and one end of the second diode D8, the other end of the fourth resistor R14 is coupled to one end of the fifth resistor R15, the other end of the fifth resistor R6329 is coupled to an emitter of the first transistor Q3, a base of the first transistor Q42 is coupled to the other end of the second diode D8 and to one end of the sixth resistor R16, the other end of the sixth resistor R16 is coupled to one end of the seventh resistor R395, and the other end of the seventh resistor R3 is coupled to a collector of the first transistor Q5857324 120-3.
Referring to fig. 4, an input terminal of the regulated protection circuit 130 is coupled to an output terminal of the current limiting circuit 120. In fig. 4, the regulated protection circuit 130 includes a third diode D4, a fourth diode D9, a second capacitor C4, an eighth resistor R18, and a ninth resistor R19. One end of the second capacitor C4, one end of the eighth resistor R18, and one end of the ninth resistor R19 are coupled to a first input terminal of the input terminals of the regulated voltage protection circuit, the other end of the second capacitor C4 are coupled to a second input terminal of the input terminals of the regulated voltage protection circuit, and the other end of the ninth resistor R19 are coupled to a second output terminal of the output terminals of the regulated voltage protection circuit, one end of the third diode D4 is coupled to the first input terminal of the regulated voltage protection circuit, the other end of the third diode D4 is coupled to one end of the fourth diode D9, and the other end of the fourth diode D9 is coupled to the first output terminal of the output terminals of the regulated voltage protection circuit.
The input end of the optical coupling circuit 140 is coupled with the output end of the regulated voltage protection circuit 130, and the optical coupling circuit 140 includes a first optical coupling element U1 and a second optical coupling element U2, the first end of the first optical coupling element U1 is coupled with the first input end in the input end of the optical coupling circuit, the second end of the first optical coupling element U1 is coupled with the first end of the second optical coupling element U2, the second end of the second optical coupling element U2 is coupled with the second input end in the input end of the optical coupling circuit, the third end and the fourth end of the first optical coupling element U1 and the second optical coupling element U2 are coupled with the output end of the optical coupling circuit respectively.
In one embodiment, the STO input circuit described above can be used in a frequency converter (not shown). Transducers incorporating STO input circuits of the present invention are particularly well suited for use in situations where test pulses are present on the transmission channel, such as servo systems as exemplified in the background-programmable logic devices are not directly coupled to the transducer, but instead communicate first via one or more channels with a servo drive that communicates with the transducer via one or more other channels. In such a system, in order to detect a fault on a selected channel, a programmable logic device or a servo driver periodically sends a test pulse for detection, thereby achieving a high diagnostic coverage and ensuring high reliability of the system.
It is noted that the STO input circuit or the frequency converter comprising the STO input circuit described above is equally applicable in the case of a system in which no test pulse is present on the channel. Those skilled in the art will appreciate that the STO input circuits described above (such as the circuits shown in fig. 2 or fig. 4) are merely illustrative. Various other circuits may be employed by those skilled in the art to implement the current limiting circuit, the regulated protection circuit, and the optocoupler circuit in the examples. Moreover, for the STO input circuit, the connection structure or sequence of the current limiting circuit, the voltage stabilizing protection circuit and the optical coupling circuit can be adjusted or changed as required, and even a part or all of the circuits can be removed, which is easily conceived by those skilled in the art.
In conclusion, the technical scheme of the invention can effectively avoid unreasonable suppression of the test pulse transmitted on the channel, and ensure the normal work of the test pulse while suppressing clutter.
The above examples mainly illustrate the STO input circuit, frequency converter, servo system and filter bleed circuit for frequency converters of the present invention. Although only a few embodiments of the present invention have been described in detail, those skilled in the art will appreciate that the present invention may be embodied in many other forms without departing from the spirit or scope thereof. Accordingly, the present examples and embodiments are to be considered as illustrative and not restrictive, and various modifications and substitutions may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (10)
1. An STO input circuit for a frequency converter, the STO input circuit comprising:
a filter bleeder circuit coupled to an input terminal of the frequency converter for filtering noise input through the input terminal, wherein the filter bleeder circuit comprises a first resistor (R201), a first capacitor (C3) and a first diode (D13), the first diode (D13) is unidirectionally turned on and reversely turned off to ensure that the first capacitor (C3) cannot discharge to the input terminal when the first capacitor (C3) discharges, and the second resistor (R201) provides a bleeder circuit to ground such that a level of the input terminal is maintained at a low level when an external test pulse input to the STO input circuit is at the low level;
a current limiting circuit coupled with the filter bleed circuit for limiting a current;
the voltage stabilizing protection circuit is coupled with the current limiting circuit and is used for performing voltage stabilizing protection; and
and the optical coupling circuit is coupled with the voltage-stabilizing protection circuit and is used for controlling the safe torque of the frequency converter to be turned off.
2. The STO input circuit of claim 1, wherein the filter bleeder circuit further comprises a transient voltage suppression diode (D6) and a second resistor (R2), wherein one terminal of the transient voltage suppression diode (D6) is coupled to a first one of the input terminals, the other terminal of the transient voltage suppression diode (D6) is coupled to a second one of the input terminals, one terminal of the second resistor (R2) is coupled to the first input terminal, the other terminal of the second resistor (R2) is coupled to one terminal of the first diode (D13), the other terminal of the first diode (D13) is coupled to one terminal of the first capacitor (C3), the other terminal of the first capacitor (C3) is coupled to the second input terminal, one terminal of the first resistor (R201) is coupled to the first input terminal, and the other end of the first resistor (R201) is coupled to the second input.
3. The STO input circuit of claim 1, wherein an input of the current limiting circuit is coupled with an output of the filter bleeder circuit, and the current limiting circuit comprises one or more sub-current limiting units.
4. An STO input circuit according to claim 3, wherein the sub current limiting unit (120-1, 120-2, 120-3) comprises a third resistor (R3, R8, R13), a fourth resistor (R4, R9, R14), a fifth resistor (R5, R5, R5), a sixth resistor (R5, R5, R5), a seventh resistor (R5, R5, R5), a first transistor (Q5, Q5, Q5) and a second diode (D5, D5, D5), wherein one end of the third resistor (R5, R5, R5) is coupled to an input end of the sub current limiting unit (120-1, 120-2, 120-3), the other end of the third resistor (R5, R5, R5) is coupled to the fourth resistor (R5, R5, R5, R5) and the second diode (D5, D5), one end of the D7, D8), the other end of the fourth resistor (R4, R9, R14) is coupled to one end of the fifth resistor (R5, R10, R15), the other end of the fifth resistor (R5, R10, R15) is coupled to the emitter of the first transistor (Q1, Q2, Q3), the base of the first transistor (Q1, Q2, Q3) is coupled to the other end of the second diode (D5, D7, D8) and to one end of the sixth resistor (R6, R11, R16), the other end of the sixth resistor (R6, R11, R16) is coupled to one end of the seventh resistor (R7, R12, R17), the other end of the seventh resistor (R7, R7) is coupled to the collector of the first transistor (R5, R10, R3572, Q361), 120-2, 120-3).
5. The STO input circuit of claim 1, wherein an input of the regulated protection circuit is coupled to an output of the current limiting circuit, and the regulated protection circuit comprises a third diode (D4), a fourth diode (D9), a second capacitor (C4), an eighth resistor (R18), and a ninth resistor (R19), wherein the second capacitor (C4), the eighth resistor (R18), and the ninth resistor (R19) have one end coupled to a first one of the inputs of the regulated protection circuit and another end coupled to a second one of the inputs of the regulated protection circuit and a second one of the outputs of the regulated protection circuit, one end of the third diode (D4) is coupled to the first input of the regulated protection circuit, and another end of the third diode (D4) is coupled to one end of the fourth diode (D9), and the other end of the fourth diode (D9) is coupled to a first one of the output terminals of the regulated protection circuit.
6. An STO input circuit as claimed in claim 1 wherein the input of the optical coupler circuit is coupled to the output of the regulated protection circuit and the optical coupler circuit comprises a first optical coupler element (U1) and a second optical coupler element (U2), the first end of the first optical coupler element (U1) is coupled to a first one of the inputs of the optical coupler circuit, the second end of the first optical coupler element (U1) is coupled to a first one of the inputs of the second optical coupler element (U2), the second end of the second optical coupler element (U2) is coupled to a second one of the inputs of the optical coupler circuit, and the third and fourth ends of the first optical coupler element (U1) and the second optical coupler element (U2) are coupled to the output of the optical coupler circuit, respectively.
7. A frequency converter comprising an STO input circuit as claimed in any one of claims 1 to 6.
8. A servo system comprising a programmable logic device, a servo drive and a frequency converter according to claim 7, wherein the programmable logic device communicates with the servo drive via one or more channels and the servo drive also communicates with the frequency converter via one or more other channels, wherein the programmable logic device or the servo drive checks whether the used channel fails by periodically sending test pulses.
9. A filter bleeder circuit, comprising a first resistor (R201), a first capacitor (C3) and a first diode (D13), wherein the first diode (D13) is unidirectionally conducting and reversibly blocking to ensure that the first capacitor (C3) cannot discharge to an input of the filter bleeder circuit when the first capacitor (C3) discharges, and wherein the second resistor (R201) provides a bleeder circuit to ground such that when an external test pulse is low, the level of the input is also maintained low.
10. The filter bleeder circuit as claimed in claim 9, wherein said filter bleeder circuit further comprises a transient voltage suppression diode (D6) and a second resistor (R2), wherein one terminal of said transient voltage suppression diode (D6) is coupled to a first input terminal of said filter bleeder circuit, the other terminal of said transient voltage suppression diode (D6) is coupled to a second input terminal of said filter bleeder circuit, one terminal of said second resistor (R2) is coupled to said first input terminal, the other terminal of said second resistor (R2) is coupled to one terminal of said first diode (D13), the other terminal of said first diode (D13) is coupled to one terminal of said first capacitor (C3), the other terminal of said first capacitor (C3) is coupled to said second input terminal, one terminal of said first resistor (R201) is coupled to said first input terminal, and the other end of the first resistor (R201) is coupled to the second input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810948653.0A CN110854830A (en) | 2018-08-20 | 2018-08-20 | STO input circuit for frequency converter, servo system and filter bleeder circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810948653.0A CN110854830A (en) | 2018-08-20 | 2018-08-20 | STO input circuit for frequency converter, servo system and filter bleeder circuit |
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| CN110854830A true CN110854830A (en) | 2020-02-28 |
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| CN105375613A (en) * | 2014-08-21 | 2016-03-02 | 天津市北海通信技术有限公司 | Capacitance matrix circuit |
| CN205681118U (en) * | 2016-06-21 | 2016-11-09 | 南京华士电子科技有限公司 | A kind of novel digital signal detection circuit |
| WO2017152811A1 (en) * | 2016-03-08 | 2017-09-14 | 深圳光启智能光子技术有限公司 | Optical noise removal circuit, optical receiver, and optical chip |
| CN107157481A (en) * | 2017-05-10 | 2017-09-15 | 湖南海翼电子商务股份有限公司 | Measure circuit, method and the bodily fat measurement device of human body resistance |
| CN107171734A (en) * | 2016-03-08 | 2017-09-15 | 深圳光启智能光子技术有限公司 | Optical chip for optic communication |
| CN206773162U (en) * | 2017-01-25 | 2017-12-19 | 博世力士乐(西安)电子传动与控制有限公司 | Frequency converter status monitoring circuit and the frequency converter comprising the circuit |
| CN107707227A (en) * | 2016-08-03 | 2018-02-16 | 博世力士乐(西安)电子传动与控制有限公司 | Optical encoder signal input circuit and the frequency converter comprising the circuit |
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| CN1824860A (en) * | 2006-03-21 | 2006-08-30 | 常州市第八纺织机械厂 | Beam warping machine servo-controlling method and lateral movement device using same |
| CN201374556Y (en) * | 2009-03-09 | 2009-12-30 | 常州亚兴数控设备有限公司 | Protective circuit for transmitting disk of electric tool rest |
| CN203657820U (en) * | 2013-12-30 | 2014-06-18 | 深圳市英威腾电气股份有限公司 | Conditioning circuit for output signals of incremental encoder |
| CN105375613A (en) * | 2014-08-21 | 2016-03-02 | 天津市北海通信技术有限公司 | Capacitance matrix circuit |
| WO2017152811A1 (en) * | 2016-03-08 | 2017-09-14 | 深圳光启智能光子技术有限公司 | Optical noise removal circuit, optical receiver, and optical chip |
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| CN205681118U (en) * | 2016-06-21 | 2016-11-09 | 南京华士电子科技有限公司 | A kind of novel digital signal detection circuit |
| CN107707227A (en) * | 2016-08-03 | 2018-02-16 | 博世力士乐(西安)电子传动与控制有限公司 | Optical encoder signal input circuit and the frequency converter comprising the circuit |
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