Motor zeroing induction switch circuit

Abstract

The utility model embodiment discloses a motor zeroing induction switch circuit, which includes: a photoelectric switch circuit, n voltage comparison circuits and n gate circuits, wherein: the n voltage comparison circuits are connected in parallel, and each voltage comparison circuit includes two parallel first comparison circuits and second comparison circuits; the first comparison circuit includes a first comparator and a first resistor connected in series, and the second comparison circuit includes a second comparator and a second resistor connected in series; the voltage output end of the photoelectric switch circuit is respectively connected to the positive input end of each first comparator and the second comparator, and the negative input end of the comparator is connected to the reference voltage; the output ends of the first comparison circuit and the second comparison circuit of the i-th voltage comparison circuit are respectively connected to the two signal input ends of the i-th gate circuit. The use of the embodiment of the present application is conducive to improving the zeroing accuracy of the motor.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to a motor zeroing induction switch circuit. Background Art

[0002] Photoelectric switch (photoelectric sensor) is the abbreviation of photoelectric proximity switch. It uses the blocking or reflection of the light beam by the detected object to select the circuit by the synchronous circuit to detect the presence or absence of the object. The photoelectric switch converts the input current into a light signal on the transmitter, and the receiver detects the target object according to the intensity or presence of the received light. Therefore, it is often used in the field of industrial control technology, especially the induction control of motor zeroing.

[0003] However, in actual use, the traditional motor zeroing sensing photoelectric switch only outputs two signals, 0 / 1, corresponding to the unblocked and blocked states. However, in usage scenarios that require high precision, this zeroing method cannot meet the accuracy requirements. Due to detection errors, there is still a large motor running distance between 0 and 1, resulting in a large zeroing error. Utility Model Content

[0004] The embodiment of the utility model provides a motor zeroing induction switch circuit, which is beneficial to improving the zeroing accuracy of the motor.

[0005] The present utility model provides a motor zeroing induction switch circuit on one hand, and the motor zeroing induction switch circuit includes: a photoelectric switch circuit, n voltage comparison circuits and n gate circuits, wherein:

[0006] n voltage comparison circuits are connected in parallel, each of which includes two first comparison circuits and a second comparison circuit connected in parallel;

[0007] The first comparison circuit includes a first comparator and a first resistor connected in series, and the second comparison circuit includes a second comparator and a second resistor connected in series;

[0008] The voltage output terminal of the photoelectric switch circuit is connected to the positive input terminal of each first comparator and the second comparator respectively, and the negative input terminals of the two comparators are connected to the corresponding reference voltage;

[0009] The output terminals of the first comparison circuit and the second comparison circuit of the i-th voltage comparison circuit are respectively connected to the two signal input terminals of the i-th gate circuit;

[0010] The reference voltage of the first comparator of each voltage comparison circuit is less than the reference voltage of the second comparator; the reference voltage of the second comparator of the i-th voltage comparison circuit is equal to the reference voltage of the first comparator of the (i+1)-th voltage comparison circuit.

[0011] Optionally, the negative input terminal of the first comparator of the first voltage comparison circuit is grounded.

[0012] Optionally, the motor zeroing sensing switch circuit further includes an operational amplifier, wherein:

[0013] The positive input terminal of the operational amplifier is connected to the output terminal of the photoelectric switch circuit, the negative input terminal of the operational amplifier is connected to the output terminal of the operational amplifier, and the output terminal of the operational amplifier is respectively connected to the positive input terminal of each comparator.

[0014] Optionally, the gate circuit is an XOR gate circuit, and the output ends of the two comparators of the i-th voltage comparison circuit are respectively connected to the two signal input ends of the i-th XOR gate circuit.

[0015] Optionally, the motor zeroing induction switch circuit further includes n transistor switch circuits, and the output end of the i-th gate circuit is connected to the input end of the i-th transistor switch circuit.

[0016] Optionally, the transistor switching circuit includes a third resistor, a first transistor, a fourth resistor, a fifth resistor and a light emitting diode; the control electrode of the first transistor is connected to the first end of the third resistor, the emitter of the first transistor is connected to the second end of the third resistor and to ground, the collector of the first transistor is connected to the first end of the fourth resistor and the cathode of the light emitting diode, the anode of the light emitting diode is connected to the first end of the fifth resistor, and the second end of the fifth resistor is connected to the second end of the fourth resistor and the first power supply.

[0017] Optionally, the light emitting diodes included in each transistor switch circuit emit light of different colors.

[0018] Optionally, the motor zeroing sensing switch circuit further includes n level conversion circuits, and the output end of the i-th transistor switch circuit is connected to the input end of the i-th level conversion circuit.

[0019] Optionally, the level conversion circuit includes a sixth resistor, a seventh resistor and a second transistor, the first end of the sixth resistor is connected to the first end of the seventh resistor and the control electrode of the second transistor, and the second end of the seventh resistor is connected to the second power supply and the emitter of the second transistor.

[0020] Optionally, the motor zeroing induction switch circuit further includes n filter circuits, the output end of the i-th gate circuit is connected to the input end of the i-th filter circuit, and the output end of the i-th filter circuit is connected to the input end of the i-th transistor switch circuit.

[0021] Optionally, the filtering circuit includes an eighth resistor and a capacitor, a first end of the eighth resistor is connected to the output end of the gate circuit, a second end of the eighth resistor is connected to the first end of the capacitor, and a second end of the capacitor is grounded.

[0022] Optionally, the photoelectric switch circuit includes: a first current limiter, an optical coupler and a second current limiter, the optical coupler includes a transmitter and a receiver; the first current limiter is connected between a third power supply and an input end of the transmitter to limit the current of the transmitter; the second current limiter is connected between a fourth power supply and an input end of the receiver to limit the current of the receiver.

[0023] Optionally, the motor zeroing sensing switch circuit also includes a circuit board, and the output ends of the n gate circuits are respectively connected to the n signal input pins of the circuit board, and the output end of the circuit board is used to connect to the signal input end of the controller. The controller determines the motor zeroing position in real time based on the electrical signals input by the n signal input pins of the circuit board.

[0024] The motor zeroing induction switch circuit provided by the embodiment of the utility model comprises a photoelectric switch circuit, n voltage comparison circuits and n gate circuits, wherein: the n voltage comparison circuits are connected in parallel, and each voltage comparison circuit comprises two first comparison circuits and second comparison circuits connected in parallel; the first comparison circuit comprises a first comparator and a first resistor connected in series, and the second comparison circuit comprises a second comparator and a second resistor connected in series; the voltage output end of the photoelectric switch circuit is respectively connected to the positive input end of each first comparator and the second comparator, and the negative input ends of the two comparators are both connected to the corresponding reference voltage; the photoelectric switch circuit outputs a voltage signal to the voltage comparison circuit, and each voltage comparison circuit can form a single channel to compare the voltage signal with its corresponding range voltage, and the first comparison circuit and the second comparison circuit of each voltage comparison circuit are respectively used to compare the voltage signal with a single reference voltage within the range voltage, so as to realize the comparison between the voltage signal and the two reference voltages within the range voltage;

[0025] The output ends of the first comparison circuit and the second comparison circuit of the i-th voltage comparison circuit are respectively connected to the two signal input ends of the i-th gate circuit; thus, the two high and low level signals outputted by the first comparison circuit and the second comparison circuit enter the gate circuit, and the gate circuit can judge and output the final high and low level signals;

[0026] Wherein, the reference voltage of the first comparator of each voltage comparison circuit is less than the reference voltage of the second comparator; thus, the first comparator can be used to compare the voltage signal output by the photoelectric switch circuit with the low value of the range voltage, and the second comparator can be used to compare the voltage signal output by the photoelectric switch circuit with the high value of the range voltage;

[0027] The reference voltage of the second comparator of the i-th voltage comparison circuit is equal to the reference voltage of the first comparator of the (i+1)-th voltage comparison circuit; thus, the continuity of the voltage range of adjacent voltage comparison circuits is achieved;

[0028] Ultimately, each voltage comparison circuit can compare the voltage signal output by the photoelectric switch circuit with its corresponding range voltage and judge it through the gate circuit, and output a high and low level signal respectively; n voltage comparison circuits and n gate circuits can realize the output of n high and low level signals, which is beneficial for the lower-level devices to determine the n positions in the motor zeroing process according to these n signals. Compared with the prior art of zeroing based on two signals, the voltage range corresponding to each signal in the present application is smaller and the zeroing accuracy is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a structural schematic diagram of a voltage comparison circuit provided by an embodiment of the utility model;

[0031] Figure 2 It is a structural schematic diagram of a transistor switch circuit provided by an embodiment of the utility model;

[0032] Figure 3 It is a structural schematic diagram of a transistor switch circuit provided by an embodiment of the utility model;

[0033] Figure 4 It is a structural schematic diagram of a filter circuit provided by an embodiment of the utility model;

[0034] Figure 5 It is a structural schematic diagram of a photoelectric switch circuit provided by an embodiment of the utility model;

[0035] Figure 6 It is a structural schematic diagram of a motor zeroing induction switch circuit provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0036] The specific implementation of the utility model will be described in more detail below in conjunction with the schematic diagram. The advantages and features of the utility model will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the utility model.

[0037] In the description of the present invention, it should be understood that the terms "center", "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0039] Please refer to Figure 1 , Figure 1 1 is a schematic diagram of a voltage comparison circuit provided by an embodiment of the utility model. The voltage comparison circuit 100 includes two first comparison circuits 110 and second comparison circuits 120 connected in parallel; the first comparison circuit 110 includes a first comparator 111 and a first resistor 112 connected in series, and the second comparison circuit 120 includes a second comparator 121 and a second resistor 122 connected in series.

[0040] Optionally, the negative input terminals of the two comparators are connected to the corresponding reference voltage, and the positive input terminals of the two comparators are connected to the output terminals of other circuits. For example, the negative input terminal of the first comparator 111 is connected to the reference voltage 113, and the negative input terminal of the second comparator 121 is connected to the reference voltage 123. For example, the positive input terminals of the first comparator 111 and the second comparator 121 can be connected to the voltage output terminal of the photoelectric switch circuit.

[0041] Optionally, if the reference voltage 113 connected to the negative input terminal of the first comparator of the first voltage comparison circuit is 0, the negative input terminal of the first comparator of the first voltage comparison circuit is grounded.

[0042] Optionally, the negative power supply terminal of the first comparator of the voltage comparison circuit is grounded, the positive power supply terminal of the first comparator is connected to the fifth power supply 115, and the positive and negative power supply terminals of the second comparator are not connected to the power supply or are grounded.

[0043] Optionally, a first end of the first resistor 112 is connected to the output end of the first comparator 111, and a second end of the first resistor 112 is connected to the sixth power supply 114. A first end of the second resistor 122 is connected to the output end of the second comparator 121, and a second end of the second resistor 122 is connected to the seventh power supply 124.

[0044] The voltages input by the fifth power supply, the sixth power supply, and the seventh power supply may be the same or different, which is not limited here.

[0045] Please refer to Figure 2 , Figure 2 It is a structural schematic diagram of a transistor switch circuit provided by an embodiment of the utility model. The transistor switch circuit 200 includes a third resistor 201, a first transistor 202, a fourth resistor 203, a fifth resistor 204 and a light emitting diode 205; the control electrode of the first transistor 202 is connected to the first end 201a of the third resistor 201, the emitter of the first transistor 202 is connected to the second end 201b of the third resistor 201 and is grounded, the collector of the first transistor 202 is connected to the first end 203a of the fourth resistor 203 and the cathode of the light emitting diode 205, the anode of the light emitting diode 205 is connected to the first end 204a of the fifth resistor 204, and the second end 204b of the fifth resistor 204 is connected to the second end 203b of the fourth resistor 203 and the first power supply 206.

[0046] Please refer to Figure 3 , Figure 3 1 is a schematic diagram of a transistor switch circuit provided by an embodiment of the utility model. The level conversion circuit 300 includes a sixth resistor 301, a seventh resistor 302 and a second transistor 303, wherein a first end 301a of the sixth resistor 301 is connected to a first end 302a of the seventh resistor 302 and a control electrode of the second transistor 303, and a second end 302b of the seventh resistor 302 is connected to a second power source 304 and an emitter of the second transistor 303.

[0047] Optionally, the first transistor and the second transistor may be triodes or metal-oxide-semiconductor field-effect transistors (MOSFET).

[0048] Please refer to Figure 4 , Figure 4 The filter circuit 400 includes an eighth resistor 401 and a capacitor 402, wherein a second end 401b of the eighth resistor 401 is connected to a first end 402a of the capacitor 402, and a second end 402b of the capacitor 402 is grounded.

[0049] Please refer to Figure 5 , Figure 51 is a schematic diagram of a photoelectric switch circuit provided by an embodiment of the utility model. The photoelectric switch circuit 500 includes: a first current limiter 510, an optical coupler 520 and a second current limiter 530, the optical coupler 520 includes a transmitter 521 and a receiver 522; the first current limiter 510 is connected between a third power supply 540 and an input end of the transmitter 521 to limit the current of the transmitter 521; the second current limiter 530 is connected between a fourth power supply 550 and an input end of the receiver 522 to limit the current of the receiver 522.

[0050] The transmitter 521 is used to transmit light, and the receiver 522 outputs a voltage of corresponding magnitude according to the intensity of the received light.

[0051] The transmitter 521 may be an infrared light emitting diode, which converts electrical energy into light of a specific wavelength. There may be a closed optical channel (also called a dielectric channel) between the transmitter 521 and the receiver 552, and the receiver may sense light of a specific wavelength and convert the light into electrical energy. The receiver 522 may be a photoresistor, a photodiode, a phototransistor, a silicon controlled rectifier (SCR) or a triode for alternating current (TRIAC). In addition to emitting light, a light emitting diode can also be used as a light sensing element. Therefore, a light emitting diode can be used as a light sensing element, which is a symmetrical bidirectional optical coupler.

[0052] The voltage output by the fourth power supply may be equal to the voltage output by the third power supply, or may not be equal to the voltage output by the third power supply, which is not limited here.

[0053] Further, when the receiver 522 is a phototransistor, the collector of the transistor (ie, the output end of the receiver 522) is connected to the second current limiter 510, and the emitter of the transistor is grounded. When the transmitter 521 is a light emitting diode, the cathode of the light emitting diode is grounded.

[0054] Optionally, the first current limiter is a constant current source, or a first resistor, or includes at least two second resistors connected in parallel; the second current limiter is a third resistor.

[0055] The present utility model also provides a motor zeroing induction switch circuit, which includes: a photoelectric switch circuit 500, n voltage comparison circuits 100 and n gate circuits 600, wherein:

[0056] n voltage comparison circuits 100 are connected in parallel, and each voltage comparison circuit 100 includes two first comparison circuits 110 and second comparison circuits 120 connected in parallel;

[0057] The first comparison circuit 110 includes a first comparator 111 and a first resistor 112 connected in series, and the second comparison circuit 120 includes a second comparator 121 and a second resistor 122 connected in series;

[0058] The voltage output terminal of the photoelectric switch circuit 100 is connected to the positive input terminals of the first comparator 111 and the second comparator 121 respectively, and the negative input terminals of the two comparators are connected to the corresponding reference voltage;

[0059] The output terminals of the first comparison circuit 110 and the second comparison circuit 120 of the i-th voltage comparison circuit are respectively connected to the two signal input terminals of the i-th gate circuit;

[0060] The reference voltage of the first comparator 111 of each voltage comparison circuit 100 is less than the reference voltage of the second comparator 121; the reference voltage of the second comparator 121 of the i-th voltage comparison circuit is equal to the reference voltage of the first comparator 111 of the i+1-th voltage comparison circuit.

[0061] Wherein, n is an integer greater than or equal to 3, and i is an integer greater than 0 and less than n. The comparator includes a first comparator and a second comparator; the voltage comparison circuit 100 is described in detail in Figure 1 For a detailed description of the photoelectric switch circuit 500, see Figure 5 The corresponding embodiments will not be described in detail here.

[0062] Take n=3 as an example, please refer to Figure 6 , Figure 6 The schematic diagram of the structure of a motor zeroing induction switch circuit provided by the embodiment of the utility model. The motor zeroing induction switch circuit comprises: a photoelectric switch circuit 500, three voltage comparison circuits 100 and three gate circuits 700, wherein:

[0063] Three voltage comparison circuits 100 are connected in parallel, and each voltage comparison circuit 100 includes two first comparison circuits 110 and second comparison circuits 120 connected in parallel;

[0064] The first comparison circuit 110 includes a first comparator 111 and a first resistor 112 connected in series, and the second comparison circuit 120 includes a second comparator 121 and a second resistor 122 connected in series;

[0065] The voltage output terminal of the photoelectric switch circuit 100 is connected to the positive input terminal of each first comparator 111 and the second comparator 121 respectively, and the negative input terminal of the comparator is connected to the reference voltage;

[0066] The output ends of the first comparison circuit 110 and the second comparison circuit 120 of the first voltage comparison circuit are respectively connected to the two signal input ends of the first gate circuit; the output ends of the first comparison circuit 110 and the second comparison circuit 120 of the second voltage comparison circuit are respectively connected to the two signal input ends of the second gate circuit; the output ends of the first comparison circuit 110 and the second comparison circuit 120 of the third voltage comparison circuit are respectively connected to the two signal input ends of the third gate circuit;

[0067] Among them, the reference voltage of the first comparator 111 of each voltage comparison circuit 100 is less than the reference voltage of the second comparator 121; the reference voltage of the second comparator 121 of the first voltage comparison circuit is equal to the reference voltage of the first comparator 111 of the second voltage comparison circuit, and the output ends of the first comparison circuit 110 and the second comparison circuit 120 of the second voltage comparison circuit are respectively connected to the two signal input ends of the third gate circuit.

[0068] Optionally, a negative input terminal of the first comparator 111 of the first voltage comparison circuit is grounded.

[0069] The negative input terminal of the first comparator 111 of the first voltage comparison circuit is grounded through the ninth resistor 116 ; the negative input terminal of the second comparator 121 of the third voltage comparison circuit is connected to the reference voltage through the tenth resistor 125 .

[0070] In a specific embodiment, the voltage range output by the photoelectric switch circuit 500 is 0-5V, the range voltage of the first voltage comparison circuit 100 can be 0-1.25V, the range voltage of the second voltage comparison circuit 100 can be 1.25V-3.3V, and the range voltage of the third voltage comparison circuit 100 can be 3.3V-5V. In this way, the continuity of the range voltages of adjacent voltage comparison circuits is achieved, so that monitoring can be performed in the entire range of 0-5V.

[0071] The embodiments in the present application can be used for motor zeroing. For example, the final motor zeroing interval is in the second interval 1.25V-3.3V. If the actual voltage value is detected in the first interval 0-1.25V, the motor is controlled to drive the baffle to rotate forward to increase the voltage; if the actual voltage value is detected in the third interval 3.3V-5V, the motor is controlled to drive the baffle to rotate backward to reduce the voltage, so that the motor is in the second interval when it stops, and a more accurate zeroing position is obtained.

[0072] It can be seen that the motor zeroing induction switch circuit provided by the embodiment of the utility model includes a photoelectric switch circuit, n voltage comparison circuits and n gate circuits, wherein: the n voltage comparison circuits are connected in parallel, and each voltage comparison circuit includes two first comparison circuits and second comparison circuits connected in parallel; the first comparison circuit includes a first comparator and a first resistor connected in series, and the second comparison circuit includes a second comparator and a second resistor connected in series; the voltage output end of the photoelectric switch circuit is respectively connected to the positive input end of each first comparator and the second comparator, and the negative input end of the comparator is connected to the reference voltage; the photoelectric switch circuit outputs a voltage signal to the voltage comparison circuit, and each voltage comparison circuit can form a single channel to compare the voltage signal with its corresponding range voltage, and the first comparison circuit and the second comparison circuit of each voltage comparison circuit are respectively used to compare the voltage signal with a single reference voltage within the range voltage, so that the voltage signal can be compared with two reference voltages within the range voltage;

[0073] The output ends of the first comparison circuit and the second comparison circuit of the i-th voltage comparison circuit are respectively connected to the two signal input ends of the i-th gate circuit; thus, the two high and low level signals outputted by the first comparison circuit and the second comparison circuit enter the gate circuit, and the gate circuit can judge and output the final high and low level signals;

[0074] Wherein, the reference voltage of the first comparator of each voltage comparison circuit is less than the reference voltage of the second comparator; thus, the first comparator can be used to compare the voltage signal output by the photoelectric switch circuit with the low value of the range voltage, and the second comparator can be used to compare the voltage signal output by the photoelectric switch circuit with the high value of the range voltage;

[0075] The reference voltage of the second comparator of the i-th voltage comparison circuit is equal to the reference voltage of the first comparator of the (i+1)-th voltage comparison circuit; thus, the continuity of the voltage range of adjacent voltage comparison circuits is achieved;

[0076] Ultimately, each voltage comparison circuit can compare the voltage signal output by the photoelectric switch circuit with its corresponding range voltage and judge it through the gate circuit, and output a high and low level signal respectively; n voltage comparison circuits and n gate circuits can realize the output of n high and low level signals, which is beneficial for the lower-level devices to determine the n positions in the motor zeroing process according to these n signals. Compared with the prior art of zeroing based on two signals, the voltage range corresponding to each signal in the present application is smaller and the zeroing accuracy is higher.

[0077] Still for reference Figure 6 Optionally, the motor zeroing induction switch circuit further includes an operational amplifier 600, wherein:

[0078] The positive input terminal of the operational amplifier 600 is connected to the output terminal of the photoelectric switch circuit 500 (i.e., the input terminal of the receiver 522), the negative input terminal of the operational amplifier 600 is connected to the output terminal of the operational amplifier 600, and the output terminal of the operational amplifier 600 is respectively connected to the positive input terminal of each comparator (including the first comparator 111 and the second comparator 121) (i.e., the input terminal of the voltage comparison circuit 100).

[0079] In this embodiment, an operational amplifier is further added to the above embodiments, and the operational amplifier can play the role of voltage following and enhancing driving capability.

[0080] Still for reference Figure 6 Optionally, the gate circuit is an XOR gate circuit 700, and the output ends of the two comparators of the i-th voltage comparison circuit are respectively connected to the two signal input ends of the i-th XOR gate circuit 700.

[0081] The XOR gate circuit can realize the comparison of two high and low level signals. For example, if the voltage output by the photoelectric switch circuit is 1.24V, the first comparator of the first voltage comparison circuit outputs a low level signal 0, and the second comparator outputs a high level signal 1. After the first XOR gate circuit makes a judgment, the final output is a high level signal 1; the first comparator of the second voltage comparison circuit outputs a low level signal 0, and the second comparator outputs a high level signal 0. After the second XOR gate circuit makes a judgment, the final output is a high level signal 0; the first comparator of the third voltage comparison circuit outputs a low level signal 0, and the second comparator outputs a high level signal 0. After the third XOR gate circuit makes a judgment, the final output is a high level signal 0. In this way, the lower-level device determines the position corresponding to 0-1.25V during the motor zeroing process based on these three signals (100).

[0082] Optionally, the motor zeroing induction switch circuit further includes n transistor switch circuits, and the output end of the i-th gate circuit is connected to the input end of the i-th transistor switch circuit.

[0083] For a detailed introduction to transistor switching circuits, see Figure 2 The corresponding embodiments are not described in detail here. The transistor switch circuit can utilize its cut-off characteristics to realize the switch function, which is helpful to prevent the photoelectric switch circuit from being mis-conducted due to the influence of factors such as the product itself and the external environment.

[0084] Optionally, the light emitting diodes included in each transistor switch circuit emit light of different colors.

[0085] The embodiment of the present application adds the feature that the light-emitting colors of the light-emitting diodes are different from each other on the basis of the previous embodiment, so that the transistor switch circuit can intuitively judge the position of the motor during the zeroing process by color on the basis of having the function of preventing mis-conduction, and there is no need to display or judge the level signal through the offline device and then judge the position of the motor during the zeroing process.

[0086] Optionally, the motor zeroing sensing switch circuit further includes n level conversion circuits, and the output end of the i-th transistor switch circuit is connected to the input end of the i-th level conversion circuit.

[0087] For a detailed introduction to the level conversion circuit, see Figure 3 The corresponding embodiments are not described in detail here. The level conversion circuit can convert different forms of power into power supply that meets the needs of circuit or device operation, which is convenient for the operation judgment of the lower-level devices.

[0088] Optionally, the motor zeroing induction switch circuit further includes n filter circuits, the output end of the i-th gate circuit is connected to the input end of the i-th filter circuit, and the output end of the i-th filter circuit is connected to the input end of the i-th transistor switch circuit.

[0089] For a detailed introduction to the filter circuit, see Figure 4 The filter circuit only allows signal components within a certain frequency range to pass normally, and blocks signal components of other frequencies from passing through the circuit, thereby preventing the photoelectric switch circuit from being mis-conducted due to the influence of factors such as the product itself and the external environment.

[0090] Optionally, the motor zeroing sensing switch circuit also includes a circuit board, and the output ends of the n gate circuits are respectively connected to the n signal input pins of the circuit board, and the output end of the circuit board is used to connect to the signal input end of the controller. The controller determines the motor zeroing position in real time based on the electrical signals input by the n signal input pins of the circuit board.

[0091] The controller may be a programmable logic controller (PLC) or a single chip microcomputer.

[0092] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example" or "specific example" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0093] The above are only preferred embodiments of the present invention and do not limit the present invention in any way. Any technician in the relevant technical field, without departing from the scope of the technical solution of the present invention, may make any equivalent replacement or modification to the technical solution and technical content disclosed in the present invention, which shall be deemed as the content of the technical solution of the present invention and still fall within the protection scope of the present invention.

Claims

1. A motor zeroing induction switch circuit, characterized in that: The motor zeroing induction switch circuit comprises: a photoelectric switch circuit, n voltage comparison circuits and n gate circuits, wherein: n of the voltage comparison circuits are connected in parallel, and each voltage comparison circuit includes two first comparison circuits and a second comparison circuit connected in parallel; The first comparison circuit includes a first comparator and a first resistor connected in series, and the second comparison circuit includes a second comparator and a second resistor connected in series; The voltage output terminal of the photoelectric switch circuit is connected to the positive input terminal of each first comparator and the second comparator respectively, and the negative input terminals of the two comparators are connected to the corresponding reference voltage; The output terminals of the first comparison circuit and the second comparison circuit of the i-th voltage comparison circuit are respectively connected to the two signal input terminals of the i-th gate circuit; The reference voltage of the first comparator of each voltage comparison circuit is smaller than the reference voltage of the second comparator; the reference voltage of the second comparator of the i-th voltage comparison circuit is equal to the reference voltage of the first comparator of the (i+1)-th voltage comparison circuit.

2. The motor zeroing induction switch circuit according to claim 1, characterized in that: The negative input terminal of the first comparator of the first voltage comparison circuit is grounded.

3. The motor zeroing induction switch circuit according to claim 1, characterized in that: The motor zeroing induction switch circuit also includes an operational amplifier, wherein: The positive input terminal of the operational amplifier is connected to the output terminal of the photoelectric switch circuit, the negative input terminal of the operational amplifier is connected to the output terminal of the operational amplifier, and the output terminal of the operational amplifier is respectively connected to the positive input terminal of each comparator.

4. The motor zeroing induction switch circuit according to claim 1, characterized in that: The gate circuit is an XOR gate circuit, and the output ends of the two comparators of the i-th voltage comparison circuit are respectively connected to the two signal input ends of the i-th XOR gate circuit.

5. The motor zeroing induction switch circuit according to claim 1, characterized in that: The motor zeroing induction switch circuit also includes n transistor switch circuits, and the output end of the i-th gate circuit is connected to the input end of the i-th transistor switch circuit.

6. The motor zeroing induction switch circuit according to claim 5, characterized in that: The transistor switching circuit includes a third resistor, a first transistor, a fourth resistor, a fifth resistor and a light-emitting diode; the control electrode of the first transistor is connected to the first end of the third resistor, the emitter of the first transistor is connected to the second end of the third resistor and to ground, the collector of the first transistor is connected to the first end of the fourth resistor and the cathode of the light-emitting diode, the anode of the light-emitting diode is connected to the first end of the fifth resistor, and the second end of the fifth resistor is connected to the second end of the fourth resistor and a first power supply.

7. The motor zeroing induction switch circuit according to claim 6, characterized in that: The light emitting diodes included in each of the transistor switch circuits emit light of different colors.

8. The motor zeroing induction switch circuit according to claim 5, characterized in that: The motor zeroing induction switch circuit also includes n level conversion circuits, and the output end of the i-th transistor switch circuit is connected to the input end of the i-th level conversion circuit.

9. The motor zeroing induction switch circuit according to claim 8, characterized in that: The level conversion circuit includes a sixth resistor, a seventh resistor and a second transistor, the first end of the sixth resistor is connected to the first end of the seventh resistor and the control electrode of the second transistor, and the second end of the seventh resistor is connected to the second power supply and the emitter of the second transistor.

10. The motor zeroing induction switch circuit according to claim 5, characterized in that: The motor zeroing induction switch circuit also includes n filter circuits, the output end of the i-th gate circuit is connected to the input end of the i-th filter circuit, and the output end of the i-th filter circuit is connected to the input end of the i-th transistor switch circuit.

11. The motor zeroing induction switch circuit according to claim 10, characterized in that: The filter circuit comprises an eighth resistor and a capacitor, a first end of the eighth resistor is connected to the output end of the gate circuit, a second end of the eighth resistor is connected to the first end of the capacitor, and a second end of the capacitor is grounded.

12. The motor zeroing induction switch circuit according to claim 1, characterized in that: The photoelectric switch circuit includes: a first current limiter, an optical coupler and a second current limiter, the optical coupler includes a transmitter and a receiver; the first current limiter is connected between a third power supply and an input end of the transmitter to limit the current of the transmitter; the second current limiter is connected between a fourth power supply and an input end of the receiver to limit the current of the receiver.

13. The motor zeroing induction switch circuit according to any one of claims 1 to 12, characterized in that: The motor zeroing sensing switch circuit also includes a circuit board, the output ends of the n gate circuits are respectively connected to the n signal input pins of the circuit board, the output end of the circuit board is used to connect to the signal input end of the controller, and the controller determines the motor zeroing position in real time according to the electrical signals input by the n signal input pins of the circuit board.

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