CN111795714A - ABZ differential encoder detection circuit without UVW magnetic pole signal - Google Patents
ABZ differential encoder detection circuit without UVW magnetic pole signal Download PDFInfo
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- CN111795714A CN111795714A CN201910269647.7A CN201910269647A CN111795714A CN 111795714 A CN111795714 A CN 111795714A CN 201910269647 A CN201910269647 A CN 201910269647A CN 111795714 A CN111795714 A CN 111795714A
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Abstract
The invention discloses an ABZ differential encoder detection circuit without UVW magnetic pole signals, which comprises: the first detection unit comprises a first signal positive electrode interface, a first signal negative electrode interface, a first collector electrode end and a first emitter electrode end, and the first collector electrode end is connected with the detection node; the second detection unit comprises a second signal positive electrode interface, a second negative electrode interface, a second collector electrode end and a second emitter electrode end, and the second collector electrode end is connected with the first emitter electrode end; and the third detection unit comprises a third signal positive electrode interface, a third signal negative electrode interface, a third collector terminal and a third emitter terminal, wherein the third collector terminal is connected to the second emitter terminal, and whether a cable of the encoder is connected well or not is judged by connecting the tested ABZ differential encoder without the UVW magnetic pole signal and detecting the level state of the node.
Description
Technical Field
The invention relates to the technical field of encoder detection related to differential incremental signal processing, in particular to an ABZ differential encoder detection circuit without UVW magnetic pole signals.
Background
An encoder is a rotary transducer that converts displacement into a series of digital pulse signals. The encoder commonly used at present includes an incremental encoder and an absolute encoder, wherein the incremental encoder has a wider application range compared with the absolute encoder due to low cost. The existing detection of the disconnection of the incremental encoder with U, V and W signals is generally detected by the correctness of the U, V and W signals, namely when the encoder is known to have pulse signal output, whether the received U, V and W signals are correct is judged by software, and if the U, V and W signals are output to be non-full high level or non-full low level, a signal output cable of the encoder is considered to be normally connected to a receiving processing circuit of the encoder; if the received U, V and W signals are all high level or all low level, the signal output signal cable of the encoder is not connected or disconnected. The detection method by the U, V and W signals has two obvious defects: (1) the encoder must have U, V, W signal output to judge. For some application occasions, an encoder without U, V and W signals is used, and the encoder cannot judge through the detection method; (2) at present, signals of U, V and W of the universal encoder cannot judge that one of the encoder cables is abnormal because the three signals of U, V and W are used for simultaneous judgment.
Disclosure of Invention
The invention aims to provide an ABZ differential encoder detection circuit without UVW magnetic pole signals, which solves the problem that in the prior art, an encoder can only judge if U, V and W signals are output, and cannot judge if the encoder without the U, V and W signals is used; the problem that one of the encoder cables is abnormal cannot be judged.
The technical scheme of the invention is realized as follows:
the invention provides an ABZ differential encoder detection circuit without UVW magnetic pole signals, which comprises:
the first detection unit comprises a first signal positive electrode interface, a first signal negative electrode interface, a first collector terminal and a first emitter terminal, wherein the first collector terminal is connected with a detection node;
the second detection unit comprises a second signal positive electrode interface, a second signal negative electrode interface, a second collector terminal and a second emitter terminal, and the second collector terminal is connected to the first emitter terminal;
and the third detection unit comprises a third signal positive electrode interface, a third signal negative electrode interface, a third collector electrode end and a third emitter electrode end, wherein the third collector electrode end is connected to the second emitter electrode end, and whether cables of the encoders are connected well or not is judged through the level state of a detection node by connecting the first signal positive electrode interface, the first signal negative electrode interface, the second signal positive electrode interface, the second signal negative electrode interface, the third signal positive electrode interface and the third signal negative electrode interface to the tested ABZ differential encoder without UVW magnetic pole signals.
In the ABZ differential encoder detection circuit, the first detection unit further includes a first resistor, a first capacitor, and a first optical coupler, one end of the first resistor is connected to the first signal positive electrode interface, the other end of the first resistor is connected to one end of the first capacitor and a first end of the first optical coupler, the other end of the first capacitor is connected to the first signal negative electrode interface and a second end of the first optical coupler, a third end of the first optical coupler is connected to the first collector terminal, and a fourth end of the first optical coupler is connected to the first emitter terminal.
In the detection circuit of the ABZ differential encoder, the capacitance value of the first capacitor satisfies the following condition:
wherein, C1Is the capacitance value of the first capacitor, n is the resolution of the encoder, R is the maximum rotation speed of the encoder, R is1Is the resistance value of the first resistor.
In the ABZ differential encoder detection circuit, the second detection unit further includes a second resistor, a second capacitor, and a second optical coupler, one end of the second resistor is connected to the second signal positive electrode interface, the other end of the second resistor is connected to one end of the second capacitor and the first end of the second optical coupler, the other end of the second capacitor is connected to the second signal negative electrode interface and the second end of the second optical coupler, the third end of the second optical coupler is connected to the second collector terminal, and the fourth end of the second optical coupler is connected to the second emitter terminal.
In the detection circuit of the ABZ differential encoder, the capacitance value of the second capacitor satisfies the following condition:
wherein, C2Is the capacitance value of the second capacitor, n is the resolution of the encoder, R is the maximum rotation speed of the encoder, R is2Is the resistance value of the second resistor.
In the ABZ differential encoder detection circuit of the present invention, the third detection unit further includes a third resistor, a third capacitor, and a third optical coupler, one end of the third resistor is connected to the third signal positive electrode interface, the other end of the third resistor is connected to one end of the third capacitor and the first end of the third optical coupler, the other end of the third capacitor is connected to the third signal negative electrode interface and the second end of the third optical coupler, the third end of the third optical coupler is connected to the third collector terminal, and the fourth end of the third optical coupler is connected to the third emitter terminal.
In the detection circuit of the ABZ differential encoder, the capacitance value of the third capacitor satisfies the following condition:
wherein, C3Is the capacitance value of the third capacitor, n is the resolution of the encoder, and r is the resolution of the encoderMaximum rotation speed, R3Is the resistance value of the third resistor.
In the ABZ differential encoder detection circuit of the present invention, the third emitter terminal is grounded.
In the detection circuit of the ABZ differential encoder, the detection circuit of the ABZ differential encoder further comprises a pull-up resistor, one end of the pull-up resistor is connected to the detection node, and the other end of the pull-up resistor is connected to a power supply.
Therefore, the invention has the advantages that whether the encoder cable without the UVW signal is connected or not is judged through the output of the alternating current optical coupler, the structure is simple, and the cost is low.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic structural diagram of an ABZ differential encoder detection circuit without UVW magnetic pole signals according to an embodiment of the present invention;
fig. 2 is a schematic current flow diagram of an ABZ differential encoder detection circuit without UVW magnetic pole signals in the absence of disconnection according to an embodiment of the present invention.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the following description is only a specific illustration of the embodiments of the present invention and should not be taken as limiting the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an ABZ differential encoder detection circuit without UVW magnetic pole signals according to an embodiment of the present invention, where the ABZ differential encoder detection circuit without UVW magnetic pole signals includes a first detection unit 100, a second detection unit 200, and a third detection unit 300.
The first detection unit 100 includes a first signal positive electrode interface a +, a first signal negative electrode interface a-, a first collector terminal 10, and a first emitter terminal 20, where the first collector terminal 10 is connected to the detection node 70;
the second detection unit 200 includes a second signal positive electrode interface B +, a second signal negative electrode interface B-, a second collector terminal 30 and a second emitter terminal 40, wherein the second collector terminal 30 is connected to the first emitter terminal 20;
the third detection unit 300 includes a third signal positive electrode interface Z +, a third signal negative electrode interface Z-, a third collector electrode terminal 50, and a third emitter electrode terminal 60, the third collector electrode terminal 50 is connected to the second emitter electrode terminal 40, and the third detection unit determines whether a cable of the encoder is connected well or not by detecting a level state of a node 70 through the first signal positive electrode interface a +, the first signal negative electrode interface a-, the second signal positive electrode interface B +, the second signal negative electrode interface B-, the third signal positive electrode interface Z +, and the third signal negative electrode interface Z-, and connecting the encoder to a tested UVW-free magnetic pole signal.
The first detecting unit 100 further includes a first resistor R1, a first capacitor C1, and a first optocoupler U1, one end of the first resistor R1 is connected to the first signal positive electrode interface a +, the other end of the first resistor R1 is connected to one end of the first capacitor C1 and the first end 1 of the first optocoupler U1, the other end of the first capacitor C1 is connected to the first signal negative electrode interface a-and the second end 2 of the first optocoupler U1, the third end 3 of the first optocoupler U1 is connected to the first emitter end 10, and the fourth end 4 of the first collector U1 is connected to the first emitter end 20. The capacitance value of the first capacitor C1 satisfies:
wherein, C1Is the capacitance value of the first capacitor C1, n is the resolution of the encoder, R is the maximum rotation speed of the encoder, R1Is the resistance value of the first resistor R1.
The second detecting unit 200 further includes a second resistor R2, a second capacitor C2 and a second optocoupler U2, one end of the second resistor R2 is connected to the second signal positive electrode interface B +, the other end of the second resistor R2 is connected to one end of the second capacitor C2 and the first end 1 of the second optocoupler U2, the other end of the second capacitor C2 is connected to the second signal negative electrode interface B-and the second end 2 of the second optocoupler U2, the third end 3 of the second optocoupler U2 is connected to the second emitter terminal 30, and the fourth end 4 of the second collector U2 is connected to the second emitter terminal 40. The capacitance value of the second capacitor C2 satisfies:
wherein, C2Is the capacitance value of the second capacitor C2, n is the resolution of the encoder, R is the maximum rotation speed of the encoder, R2Is the resistance value of the second resistor R2.
The third detecting unit 300 further includes a third resistor R3, a third capacitor C3 and a third optocoupler U3, one end of the third resistor R3 is connected to the third signal positive electrode interface Z +, the other end of the third resistor R3 is connected to one end of the third capacitor C3 and the first end 1 of the third optocoupler U3, the other end of the third capacitor C3 is connected to the third signal negative electrode interface Z-and the second end 2 of the third optocoupler U3, the third end 3 of the third optocoupler U3 is connected to the third signal negative electrode interface Z-, and the fourth end 4 of the third collector U3 is connected to the third emitter terminal 60. The capacitance value of the third capacitor C3 satisfies the following condition:
wherein, C3Is the capacitance value of the third capacitor C3, n is the resolution of the encoder, R is the maximum rotation speed of the encoder, R3Is the resistance of the third resistor R3.
For example: the first optical coupler U1, the second optical coupler U2 and the third optical coupler U3 are three alternating current optical couplers, which are alternating current optical couplers 1 for detecting A +, A-signals, alternating current optical couplers 2 for detecting B +, B-signals and alternating current optical couplers 3 for detecting Z +, Z-signals, a pull-up resistor R4 connected with one output end of the alternating current optical coupler 1 is connected to a power signal, the other end of the alternating current optical coupler is connected to one end of the alternating current optical coupler 2, the other end of the alternating current optical coupler is connected to one end of the alternating current optical coupler 3, the other end of the alternating current optical coupler 3 is connected to a power ground, and finally, whether the line is broken is judged through the output of the alternating. When the Z + and Z-signal cables are not disconnected, the AC optical coupler 3 is normally conducted, the output of the AC optical coupler 3 is low level (namely equivalent power supply ground voltage), and if the output of the AC optical coupler 1 is not connected, the output of the AC optical coupler 1 is high level (namely equivalent power supply voltage). When the B +, B-signal, Z +, Z-signal cable is not broken, the AC optical coupler 2, 3 normally switches on the AC optical coupler 2 and outputs low level, and if the B + and B-signal cables are broken, the AC optical coupler 1 outputs high level. When the A +, A-, B +, B-, Z + and Z-signal cables are not broken, the AC optical coupler 1, the AC optical coupler 2 and the AC optical coupler 3 are all switched on, and finally the output of the AC optical coupler 1 is low level. If the A +, A-signal cable is disconnected, the AC optical coupler 1 outputs high level. Through ending if any cable disconnection appears in A +, A-, B +, B-, Z +, Z-signal cable, exchange opto-coupler 1 all will export for the high level, and external equipment just can judge through the output of exchanging opto-coupler 1 whether the ABZ differential encoder cable of no U, V, W signal connects well like this.
Referring to fig. 2, fig. 2 is a schematic current flow diagram of an ABZ differential encoder detection circuit without UVW magnetic pole signals in a disconnection-free condition according to an embodiment of the present invention. Wherein the third emitter terminal 60 is connected to ground. The ABZ differential encoder detection circuit further comprises a pull-up resistor R4, one end of the pull-up resistor R4 is connected to the detection node 70, and the other end of the pull-up resistor R4 is connected to a power supply. That is, when the ABZ differential encoder detection circuit is in a no-break condition, current flows from the power supply into the first collector terminal 10 and down to the third emitter terminal 60.
The present invention provides the following use cases:
no U, V, W difference encoder of Mo river has the power supply voltage requirement of +5V 10%, encoder A +, A-, B +, B-, Z +, Z-high level output voltage of about 4V, low voltage output of about 0V, the difference voltage high level of A + and A-, B + and B-, Z + and Z-is 4V, the low level is-4V, no matter at high level or low level, the AC optical coupler can normally conduct, R1, R2, R3 resistance play the role of current limiting, this is because the maximum output current of the signal of difference encoder is 20mA, if not series resistance can damage the encoder internal circuit. The C1, C2, and C3 filter the a, B, and Z signals of the encoders, respectively, because the encoder cable and the motor cable are generally wired in parallel, and the motor cable is an external strong interference source, the encoder signals are coupled to a large number of high-frequency interference signals. Of course, the capacitance value of the capacitor cannot be selected too much, and the type should be selected according to the following formula
R is a current limiting resistor of the disconnection detection circuit, n is the resolution of the encoder, R is the maximum rotation speed of the encoder, R4 is an output pull-up resistor R4 of the alternating current optocoupler, the resistor is used for limiting the current of the output of the alternating current optocoupler, and the requirement of the alternating current optocoupler on the minimum transmission ratio is met.
When the A +, A-, B +, B-, Z + and Z-signal cables are normally connected, the optical couplers U1, U2 and U3 are all conducted, and the node level is low level. If any one of the A +, A-, B +, B-, Z + and Z-signal cables is abnormally connected, the corresponding alternating current optical coupler cannot be normally conducted, and therefore the node level is high. Whether the cable of the output coding signal is connected can be judged only through the high and low of the node signal.
In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.
Claims (9)
1. An ABZ differential encoder detection circuit without UVW magnetic pole signals, comprising: the first detection unit comprises a first signal positive electrode interface, a first signal negative electrode interface, a first collector terminal and a first emitter terminal, wherein the first collector terminal is connected with a detection node;
the second detection unit comprises a second signal positive electrode interface, a second signal negative electrode interface, a second collector terminal and a second emitter terminal, and the second collector terminal is connected to the first emitter terminal;
and the third detection unit comprises a third signal positive electrode interface, a third signal negative electrode interface, a third collector electrode end and a third emitter electrode end, wherein the third collector electrode end is connected to the second emitter electrode end, and whether cables of the encoders are connected well or not is judged through the level state of a detection node by connecting the first signal positive electrode interface, the first signal negative electrode interface, the second signal positive electrode interface, the second signal negative electrode interface, the third signal positive electrode interface and the third signal negative electrode interface to the tested ABZ differential encoder without UVW magnetic pole signals.
2. The ABZ differential encoder detection circuit of claim 1, wherein the first detection unit further comprises a first resistor, a first capacitor and a first optical coupler, one end of the first resistor is connected to the first signal positive electrode interface, the other end of the first resistor is connected to one end of the first capacitor and a first end of the first optical coupler, the other end of the first capacitor is connected to the first signal negative electrode interface and a second end of the first optical coupler, a third end of the first optical coupler is connected to the first collector terminal, and a fourth end of the first optical coupler is connected to the first emitter terminal.
3. The ABZ differential encoder detection circuit of claim 2, wherein the capacitance value of the first capacitance satisfies:
wherein, C1Is the capacitance value of the first capacitor, n is the resolution of the encoder, and r is the encoderMaximum rotational speed of R1Is the resistance value of the first resistor.
4. The ABZ differential encoder detection circuit of claim 1, wherein the second detection unit further comprises a second resistor, a second capacitor and a second optical coupler, one end of the second resistor is connected to the second signal positive electrode interface, the other end of the second resistor is connected to one end of the second capacitor and a first end of the second optical coupler, the other end of the second capacitor is connected to the second signal negative electrode interface and a second end of the second optical coupler, a third end of the second optical coupler is connected to the second collector terminal, and a fourth end of the second optical coupler is connected to the second emitter terminal.
5. The ABZ differential encoder detection circuit of claim 4, wherein the capacitance value of the second capacitance satisfies:
wherein, C2Is the capacitance value of the second capacitor, n is the resolution of the encoder, R is the maximum rotation speed of the encoder, R is2Is the resistance value of the second resistor.
6. The ABZ differential encoder detection circuit of claim 1, wherein the third detection unit further comprises a third resistor, a third capacitor and a third optical coupler, one end of the third resistor is connected to the third signal positive electrode interface, the other end of the third resistor is connected to one end of the third capacitor and a first end of the third optical coupler, the other end of the third capacitor is connected to the third signal negative electrode interface and a second end of the third optical coupler, a third end of the third optical coupler is connected to the third collector terminal, and a fourth end of the third optical coupler is connected to the third emitter terminal.
7. The ABZ differential encoder detection circuit of claim 6, wherein the capacitance value of the third capacitance satisfies:
wherein, C3Is the capacitance value of the third capacitor, n is the resolution of the encoder, R is the maximum rotation speed of the encoder, R is3Is the resistance value of the third resistor.
8. The ABZ differential encoder detection circuit of any of claims 1-7, wherein the third emitter terminal is grounded.
9. The ABZ differential encoder detection circuit of any of claims 1-7, further comprising a pull-up resistor, one end of said pull-up resistor being connected to said detection node and the other end of said pull-up resistor being connected to a power supply.
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| CN201910269647.7A CN111795714A (en) | 2019-04-03 | 2019-04-03 | ABZ differential encoder detection circuit without UVW magnetic pole signal |
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| CN201910269647.7A CN111795714A (en) | 2019-04-03 | 2019-04-03 | ABZ differential encoder detection circuit without UVW magnetic pole signal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112636660A (en) * | 2020-12-23 | 2021-04-09 | 浙江禾川科技股份有限公司 | Servo drive control system and absolute position signal processing method, device and equipment |
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| CN108459234A (en) * | 2018-05-04 | 2018-08-28 | 深圳易能电气技术股份有限公司 | Incremental type encoder offline detection circuit |
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- 2019-04-03 CN CN201910269647.7A patent/CN111795714A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202676816U (en) * | 2012-05-15 | 2013-01-16 | 格力电器（中山）小家电制造有限公司 | A photoelectric coupling device, photoelectric coupling detection circuits, and an indication circuit |
| CN206378141U (en) * | 2016-12-26 | 2017-08-04 | 杭州之山智控技术有限公司 | Code device signal failure detector circuit based on two-way optocoupler |
| CN207215933U (en) * | 2017-06-30 | 2018-04-10 | 深圳市英威腾电气股份有限公司 | A kind of break detection circuit of incremental encoder |
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| CN112636660A (en) * | 2020-12-23 | 2021-04-09 | 浙江禾川科技股份有限公司 | Servo drive control system and absolute position signal processing method, device and equipment |
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Application publication date: 20201020 |