CN112436783B - Encoder card power-on self-checking circuit - Google Patents
Encoder card power-on self-checking circuit Download PDFInfo
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- CN112436783B CN112436783B CN202011280492.6A CN202011280492A CN112436783B CN 112436783 B CN112436783 B CN 112436783B CN 202011280492 A CN202011280492 A CN 202011280492A CN 112436783 B CN112436783 B CN 112436783B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
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Abstract
The invention relates to the technical field of motor control, in particular to an encoder card power-on self-detection circuit. The detection circuit is used for detecting whether the encoder card circuit is normal or not before the motor is powered on and does not run. The self-checking circuit of the application includes: the signal processing device is used for generating a first detection signal when the encoder card circuit is powered on; the signal conversion circuit is used for carrying out power isolation processing on the first detection signal to obtain a second detection signal and inputting the second detection signal into the encoder card circuit; the signal processing device is further configured to receive a third detection signal output from the encoder card circuit, compare the third detection signal with the first detection signal, and determine whether the encoder card circuit is normal according to a comparison result, for example, determine whether the third detection signal and the first detection signal are consistent, and if so, determine that the encoder card circuit is normal. The self-checking circuit can accurately detect whether the encoder card circuit is normal or not before the motor is powered on and does not run.
Description
Technical Field
The invention relates to the technical field of motor control, in particular to an encoder card power-on self-detection circuit.
Background
In the motor control field, the motor needs to adopt the closed-loop control mode to control, when controller driving motor operates, need to carry out real-time tracking to motor speed, direction and motor position, adopt the encoder to do this function of realization that the feedback loop can be perfect, in practical application, the detection mode to encoder/encoder card trouble is comparatively single, all need when the motor moves, MCU detects feedback signal unusual just can report the fault shutdown, when the motor does not move only to go up the electricity, can't accomplish effective detection, at this moment, in some specific occasions, in specific equipment, can have certain potential safety hazard or have the risk of damaging the instrument.
Disclosure of Invention
The invention mainly solves the technical problem that the existing encoder card detection mode can not detect the encoder card when the motor is not operated and is only electrified.
A self-checking circuit for encoder card power-on is used for detecting whether the encoder card circuit is normal before a motor is powered on and does not run; the self-test circuit includes: a signal processing device and a signal conversion circuit;
the signal processing device is used for generating a first detection signal when the encoder card circuit is powered on;
the signal conversion circuit is used for carrying out power isolation processing on the first detection signal to obtain a second detection signal and inputting the second detection signal into the encoder card circuit;
the signal processing device is also used for receiving a third detection signal output by the encoder card circuit, comparing the third detection signal with the first detection signal and judging whether the encoder card circuit is normal or not according to a comparison result.
In one embodiment, the signal processing device is a control chip, and the first detection signal output by the signal processing device is a pulse signal;
the comparing the third detection signal with the first detection signal, and determining whether the encoder card circuit is normal according to the comparison result includes: and comparing the third detection signal with the first detection signal, judging whether the third detection signal and the first detection signal are consistent, and if so, determining that the encoder card circuit is normal.
In one embodiment, the signal conversion circuit comprises a first input end, a first resistor, a second resistor, a first capacitor, a first optical coupler and a first output end;
one end of the first input end is connected with the signal processing device, the other end of the first input end is connected with one end of the first resistor, the other end of the first resistor is connected with one end of the second resistor, and the other end of the second resistor is connected with a first power supply voltage; one end of the first capacitor is also connected with the first power supply voltage, and the other end of the first capacitor is connected with the first input end through the first resistor; one input end of the first optocoupler is connected with one end of the first capacitor, the other input end of the first optocoupler is connected with the other end of the first capacitor, and the output end of the first optocoupler is connected with the first output end.
In one embodiment, the first optocoupler comprises an optocoupler primary side, an optocoupler secondary side and a first triode;
the anode of the primary side of the optocoupler is connected with one end of the first capacitor, and the cathode of the primary side of the optocoupler is connected with the other end of the first capacitor; the secondary side of the optical coupler is coupled with the primary side of the optical coupler, the anode of the optical coupler is connected with the base electrode of the first triode, the cathode of the optical coupler is connected with a second power supply voltage, the emitting electrode of the first triode is grounded, and the collector of the first triode is connected with the first output end.
In an embodiment, the encoder card circuit further comprises a filter circuit, wherein an input end of the filter circuit is connected with an output end of the encoder card circuit, and the filter circuit is used for filtering a third detection signal output by the encoder card circuit, filtering a second detection signal input by the encoder card circuit, and obtaining an actual acquisition signal of the encoder card circuit.
In one embodiment, the encoder card circuit includes a detection signal input terminal, a detection signal output terminal, a collected signal input terminal, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a second capacitor, a third diode D3, a comparator U2, a second triode T2, a second optocoupler U3, and a twelfth resistor R12;
one end of the detection signal input end is used for being connected with the first output end of the signal conversion circuit, the other end of the detection signal input end is connected with the cathode of the third diode D3, the anode of the third diode D3 is connected with one end of the third resistor R3, and the other end of the third resistor R3 is connected with a positive voltage; the detection signal input end A is connected with the anode of the third diode D3; one end of the fourth resistor R4 is connected to the anode of the third diode D3, the other end is connected to the inverting input terminal of the comparator U2, one end of the fifth resistor is connected to the positive voltage, and the other end is connected to the non-inverting input terminal of the comparator U2; one end of the seventh resistor R7 is connected with the non-inverting input end of the comparator U2, and the other end of the seventh resistor R7 is connected with the output end of the comparator U2; one end of the sixth resistor is connected with the non-inverting input end of the comparator U2, and the other end of the sixth resistor is grounded; one end of the tenth resistor is connected with the output end of the comparator U2, the other end of the tenth resistor is connected with one end of the eleventh resistor R11, and the other end of the eleventh resistor R11 is grounded; the second capacitor C2 is connected in parallel across the tenth resistor R10; the third capacitor C3 is connected in parallel across the eleventh resistor R11; one end of the eighth resistor R8 is connected with the output end of the comparator U2, the other end of the eighth resistor R8 is connected with +5V voltage, one end of the ninth resistor R9 is connected with the +5V voltage, and the other end of the ninth resistor R9 is connected with the collector electrode of the second triode T2; the base electrode of the second triode T2 is connected with the other end of the tenth resistor R10, and the emitter electrode of the second triode T2 is grounded;
the second optical coupler comprises an optical coupler primary side D4, an optical coupler secondary side D5 and a third triode; the anode of the primary side D4 of the optocoupler is connected with the collector of the second triode T2, and the cathode of the primary side D4 of the optocoupler is connected with the emitter of the second triode T2; the secondary side D5 of the optical coupler is coupled with the primary side D4 of the optical coupler; the cathode of the optical coupler secondary side D5 is connected with one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is connected with a detection signal output end; the base electrode of the third triode T3 is connected with the anode of the optocoupler secondary side D5, the emitter electrode of the third triode T3 is grounded, and the collector electrode of the third triode T3 is an output end.
In one embodiment, the filter circuit includes a thirteenth resistor R13 and a fourth capacitor C4; one end of the thirteenth resistor R13 is connected to the collector of the third transistor T3, the other end of the thirteenth resistor R3878 is connected to one end of the twelfth resistor R12, and the other end of the thirteenth resistor R13 is a signal acquisition output end for outputting an actual acquisition signal of the encoder card circuit; one end of the fourth capacitor C4 is connected to the other end of the thirteenth resistor R13, and the other end is grounded.
The encoder card power-on self-detection circuit according to the above embodiment is used for detecting whether the encoder card circuit is normal before the motor is powered on and does not run. The self-checking circuit of the application includes: the signal processing device is used for generating a first detection signal when the encoder card circuit is powered on; the signal conversion circuit is used for carrying out power isolation processing on the first detection signal to obtain a second detection signal and inputting the second detection signal into the encoder card circuit; the signal processing device is further configured to receive a third detection signal output from the encoder card circuit, compare the third detection signal with the first detection signal, and determine whether the encoder card circuit is normal according to a comparison result, for example, determine whether the third detection signal and the first detection signal are consistent, and if so, determine that the encoder card circuit is normal. Whether accurate detection encoder card circuit is normal before can realizing not moving on the motor through the self-checking circuit of this application.
Drawings
FIG. 1 is a block diagram of a self-test circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a signal conversion circuit according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a self-test circuit and an encoder card circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram illustrating a connection between a self-checking circuit and another encoder card circuit according to an embodiment of the present disclosure.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
Referring to fig. 1, the present embodiment provides an encoder card power-on self-test circuit for detecting whether an encoder card circuit is normal before a motor is powered on and not running, the self-test circuit including: the signal processing device 10 is connected to the signal conversion circuit 20, and the signal conversion circuit 20 is connected to the encoder 50 and the encoder card circuit 30. The signal processing device 10 is used for generating a first detection signal when the encoder card circuit 30 is powered on; the signal conversion circuit 20 is configured to perform power isolation processing on the first detection signal to obtain a second detection signal, and input the second detection signal into the encoder card circuit 30; the signal processing apparatus 10 is further configured to receive a third detection signal output from the encoder card circuit 30, compare the third detection signal with the first detection signal, and determine whether the encoder card circuit 30 is normal according to a comparison result.
Further, the self-checking circuit of this embodiment further includes a filter circuit, an input terminal of the filter circuit 40 is connected to an output terminal of the encoder card circuit 30, and the filter circuit 40 is configured to filter a third detection signal output by the encoder card circuit 30, filter a second detection signal input by the encoder card circuit 30, and obtain an actual acquisition signal of the encoder card circuit 30.
Specifically, in the present embodiment, the signal processing apparatus 10 is a control chip, and the output first detection signal is a narrow pulse signal. In this embodiment, comparing the third detection signal with the first detection signal, and determining whether the encoder card circuit is normal according to the comparison result includes: and comparing the third detection signal with the first detection signal, judging whether the third detection signal is consistent with the first detection signal, specifically, logically comparing the third detection signal with the first detection signal, judging whether the third detection signal is consistent with the first detection signal, if so, confirming that the encoder card circuit is normal, starting the motor to run, otherwise, confirming that the encoder card circuit is abnormal, and not starting the motor.
As shown in fig. 2, the signal conversion circuit 20 of the present embodiment includes a first input terminal PG _ I O, a first resistor R1, a second resistor R2, a first capacitor C1, a first optical coupler U1, and a first output terminal PG _ TEST; one end of the first input end PG _ I O is connected with the signal processing device 10, the other end is connected with one end of a first resistor R1, the other end of the first resistor R1 is connected with one end of a second resistor R2, and the other end of the second resistor R2 is connected with a first power supply voltage + 3.3V; one end of the first capacitor C1 is also connected with +3.3V, and the other end is connected with the first input terminal PG _ IO through the first resistor R1; one input end of the first optical coupler U1 is connected with one end of the first capacitor C1, the other input end is connected with the other end of the first capacitor C1, and the output end of the first optical coupler U1 is connected with the first output end PG _ TEST. The signal conversion circuit 20 plays a role of signal isolation, isolates an internal power supply from an encoder power supply, and avoids mutual influence of power supply signals.
The first optocoupler U1 of the present embodiment includes an optocoupler primary side D1, an optocoupler secondary side D2, and a first transistor T1; wherein, the primary side of the optical coupler is a light emitting diode, and the secondary side of the optical coupler is a light detector; the anode of the primary side D1 of the optocoupler is connected with one end of a first capacitor C1, and the cathode of the primary side D1 of the optocoupler is connected with the other end of the first capacitor C1; the secondary side D2 of the optical coupler is coupled with the primary side D1 of the optical coupler, the anode of the secondary side D2 of the optical coupler is connected with the base electrode of the first triode T1, the cathode of the secondary side D8932 of the optical coupler is connected with the +5V power supply voltage, the emitting electrode of the first triode T1 is grounded, the collector of the first triode T1 is connected with the first output end PG _ TEST, and the first output end PG _ TEST outputs a second detection signal.
The self-test circuit is described by taking an encoder card circuit adapted to an asynchronous motor as an example. As shown in fig. 3, the encoder card circuit 30 includes a detection signal input terminal PG _ TEST, a detection signal output terminal PG _ CHECK, an acquisition signal input terminal a, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a second capacitor C2, a third capacitor C3, a third diode D3, a comparator U2, a second triode T2, a second optical coupler U3, and a twelfth resistor R12. One end of the detection signal input end PG _ TEST is used for being connected with a first output end PG _ TEST of the signal conversion circuit, the other end of the detection signal input end PG _ TEST is connected with a cathode of a third diode D3, an anode of a third diode D3 is connected with one end of a third resistor R3, and the other end of the third resistor R3 is connected with +5V voltage; the detection signal input end A is connected with the anode of a third diode D3; one end of a fourth resistor R4 is connected with the anode of the third diode D3, the other end of the fourth resistor R4 is connected with the inverting input end of the comparator U2, one end of a fifth resistor R4 is connected with +5V, and the other end of the fifth resistor R4 is connected with the non-inverting input end of the comparator U2; one end of the seventh resistor R7 is connected with the non-inverting input end of the comparator U2, and the other end of the seventh resistor R7 is connected with the output end of the comparator U2; one end of the sixth resistor is connected with the positive phase input end of the comparator U2, and the other end of the sixth resistor is grounded; one end of the tenth resistor R10 is connected with the output end of the comparator U2, the other end of the tenth resistor R10 is connected with one end of the eleventh resistor R10, and the other end of the eleventh resistor R11 is grounded; the second capacitor C2 is connected in parallel across the tenth resistor R10; the third capacitor C3 is connected in parallel with two ends of the eleventh resistor R11; one end of the eighth resistor R8 is connected with the output end of the comparator U2, the other end of the eighth resistor R8 is connected with +5V voltage, one end of the ninth resistor R9 is connected with +5V voltage, and the other end of the ninth resistor R9 is connected with the collector electrode of the second triode T2; the base electrode of the second triode T2 is connected with the other end of the tenth resistor R10, and the emitting electrode of the second triode T2 is grounded; the second optocoupler U3 plays a role in isolation, and the second optocoupler U3 of the embodiment includes an optocoupler primary side D4, an optocoupler secondary side D5 and a third triode; the anode of the primary side D4 of the optocoupler is connected with the collector of a second triode T2, and the cathode of the primary side D4 of the optocoupler is connected with the emitter of the second triode T2; the secondary side D5 of the optical coupler is coupled with the primary side D4 of the optical coupler; the cathode of the optocoupler secondary side D5 is connected with one end of a twelfth resistor R12, and the other end of the twelfth resistor R12 is connected with a detection signal output end; the base of the third triode T3 is connected to the anode of the secondary side D5, the emitter is grounded, and the collector is the output terminal. The input first detection signal is a narrow pulse, and is input to the encoder card circuit 30 after being isolated by the signal conversion circuit 20, and if the signal processing apparatus 10 can still detect the narrow pulse at the detection signal output end PG _ CHECK, and after logically negating the third detection signal, a signal that is logically consistent with the first detection signal is obtained, the encoder card circuit 30 is tested to be qualified.
The filter circuit 40 of the present embodiment includes a thirteenth resistor R13 and a fourth capacitor C4; one end of a thirteenth resistor R13 is connected with the collector of the third triode T3, the other end of the thirteenth resistor R3878 is connected with one end of a twelfth resistor R12, and the other end of the thirteenth resistor R13 is an acquisition signal output end PG _ A for outputting an actual acquisition signal of the encoder card circuit; one end of the fourth capacitor C4 is connected to the other end of the thirteenth resistor R13, and the other end is grounded. The filter circuit 40 is disposed before the acquisition signal output end PG _ a, and is configured to filter the second detection signal input to the encoder card circuit 20, so as to obtain a signal acquired by the non-interference encoder 50, which can implement self-checking of the circuit without affecting the purpose of acquiring the signal by the encoder.
Example two
In this embodiment, a synchronous motor is taken as an example to describe the self-checking circuit of the present application, for example, fig. 4 is a circuit structure of an encoder card of the synchronous motor, wherein the signal processing device 10, the signal conversion circuit 20 and the filter circuit 40 are the same as those in the first embodiment, and are not described herein again. In fig. 4, the port PG _ I O is a signal input port, the port PG _ IO is connected to the first output port PG _ TEST of the signal conversion circuit 20, the port PG _ IO inputs the second detection signal, the port PG _ CHECK outputs the third detection signal, the signal processing apparatus 10 is connected to the port PG _ CHECK, and after receiving the output third detection signal, the comparison processing is performed to determine whether the current encoder card circuit is abnormal. The resistor R22 and the capacitor C18 form a filter circuit for filtering the second detection signal, and the PGA _ Ad port outputs the actual acquisition signal of the encoder.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (7)
1. A self-checking circuit for encoder card power-on is used for detecting whether the encoder card circuit is normal before a motor is powered on and does not run; wherein the self-test circuit comprises: a signal processing device and a signal conversion circuit;
the signal processing device is used for generating a first detection signal when the encoder card circuit is powered on;
the signal conversion circuit is used for carrying out power isolation processing on the first detection signal to obtain a second detection signal and inputting the second detection signal into the encoder card circuit;
the signal processing device is also used for receiving a third detection signal output by the encoder card circuit, comparing the third detection signal with the first detection signal and judging whether the encoder card circuit is normal or not according to a comparison result.
2. The encoder card power-on self-test circuit of claim 1, wherein the signal processing device is a control chip, and the output first detection signal is a pulse signal;
the comparing the third detection signal with the first detection signal, and determining whether the encoder card circuit is normal according to the comparison result includes: and comparing the third detection signal with the first detection signal, judging whether the third detection signal and the first detection signal are consistent, and if so, determining that the encoder card circuit is normal.
3. The encoder card power-on self-test circuit of claim 1, wherein the signal conversion circuit comprises a first input terminal, a first resistor, a second resistor, a first capacitor, a first optical coupler, a first output terminal;
one end of the first input end is connected with the signal processing device, the other end of the first input end is connected with one end of the first resistor, the other end of the first resistor is connected with one end of the second resistor, and the other end of the second resistor is connected with a first power supply voltage; one end of the first capacitor is also connected with the first power supply voltage, and the other end of the first capacitor is connected with the first input end through the first resistor; one input end of the first optocoupler is connected with one end of the first capacitor, the other input end of the first optocoupler is connected with the other end of the first capacitor, and the output end of the first optocoupler is connected with the first output end.
4. The encoder card power-on self-test circuit of claim 3, wherein the first optocoupler comprises an optocoupler primary side, an optocoupler secondary side, and a first triode;
the anode of the primary side of the optocoupler is connected with one end of the first capacitor, and the cathode of the primary side of the optocoupler is connected with the other end of the first capacitor; the secondary side of the optical coupler is coupled with the primary side of the optical coupler, the anode of the optical coupler is connected with the base electrode of the first triode, the cathode of the optical coupler is connected with a second power supply voltage, the emitting electrode of the first triode is grounded, and the collector of the first triode is connected with the first output end.
5. The power-on self-test circuit for the encoder card according to claim 4, further comprising a filter circuit, wherein an input terminal of the filter circuit is connected to an output terminal of the encoder card circuit, and is configured to filter a third detection signal output by the encoder card circuit, and filter a second detection signal input by the encoder card circuit, so as to obtain an actual acquisition signal of the encoder card circuit.
6. The encoder card power-on self-test circuit of claim 5, wherein the encoder card circuit comprises a detection signal input terminal, a detection signal output terminal, a collection signal input terminal, a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7), an eighth resistor (R8), a ninth resistor (R9), a tenth resistor (R10), an eleventh resistor (R11), a twelfth resistor (R12), a second capacitor (C2), a third capacitor (C3), a third diode (D3), a comparator (U2), a second triode (T2), a second optical coupler (U3), and a twelfth resistor (R12);
one end of the detection signal input end is used for being connected with the first output end of the signal conversion circuit, the other end of the detection signal input end is connected with the cathode of the third diode (D3), the anode of the third diode (D3) is connected with one end of the third resistor (R3), and the other end of the third resistor (R3) is connected with a positive voltage; the detection signal input terminal A is connected with the anode of the third diode (D3); one end of the fourth resistor (R4) is connected to the anode of the third diode (D3), the other end of the fourth resistor is connected to the inverting input terminal of the comparator (U2), one end of the fifth resistor (R5) is connected to the positive voltage, and the other end of the fifth resistor is connected to the non-inverting input terminal of the comparator (U2); one end of the seventh resistor (R7) is connected with the non-inverting input end of the comparator (U2), and the other end of the seventh resistor (R7) is connected with the output end of the comparator (U2); one end of the sixth resistor (R6) is connected with the non-inverting input end of the comparator (U2), and the other end of the sixth resistor (R6) is grounded; one end of the tenth resistor (R10) is connected with the output end of the comparator (U2), the other end of the tenth resistor (R10) is connected with one end of the eleventh resistor (R11), and the other end of the eleventh resistor (R11) is grounded; the second capacitor (C2) is connected in parallel to two ends of the tenth resistor (R10); the third capacitor (C3) is connected in parallel to two ends of the eleventh resistor (R11); one end of the eighth resistor (R8) is connected with the output end of the comparator (U2), the other end of the eighth resistor (R8) is connected with +5V voltage, one end of the ninth resistor (R9) is connected with the +5V voltage, and the other end of the ninth resistor (R9) is connected with the collector of the second triode (T2); the base electrode of the second triode (T2) is connected with the other end of the tenth resistor (R10), and the emitter electrode of the second triode is grounded;
the second optical coupler comprises an optical coupler primary side (D4), an optical coupler secondary side (D5) and a third triode (T3); the anode of the primary side (D4) of the optocoupler is connected with the collector of the second triode (T2), and the cathode of the primary side is connected with the emitter of the second triode (T2); the secondary side (D5) of the optical coupler is coupled with the primary side D4 of the optical coupler; the cathode of the secondary side (D5) of the optical coupler is connected with one end of the twelfth resistor (R12), and the other end of the twelfth resistor (R12) is connected with the detection signal output end; the base electrode of the third triode (T3) is connected with the anode of the optocoupler secondary side (D5), the emitter electrode of the third triode is grounded, and the collector electrode of the third triode is an output end.
7. The encoder card power-on self-test circuit of claim 6, wherein the filter circuit comprises a thirteenth resistor (R13) and a fourth capacitor (C4); one end of the thirteenth resistor (R13) is connected with the collector of the third triode (T3), the other end of the thirteenth resistor (R3878) is connected with one end of the twelfth resistor (R12), and the other end of the thirteenth resistor (R13) is a collected signal output end and is used for outputting an actual collected signal of the encoder card circuit; one end of the fourth capacitor (C4) is connected to the other end of the thirteenth resistor (R13), and the other end is grounded.
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| US5260971A (en) * | 1991-02-06 | 1993-11-09 | General Datacomm, Inc. | Apparatus and methods employing distribution preserving tomlinson precoding in transmission of digital data signals |
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| CN107255766A (en) * | 2017-06-30 | 2017-10-17 | 深圳市英威腾电气股份有限公司 | The break detection circuit and its connection circuit of a kind of incremental encoder |
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