A piezoelectric ceramic needle selection driving circuit and a textile equipment

Abstract

This application discloses a needle selection drive circuit for a piezoelectric ceramic needle selector and a textile device. The needle selection drive circuit includes a signal input circuit, a drive circuit, an overcurrent feedback circuit, and a protection circuit. The drive circuit includes multiple switching transistors, each corresponding to a multiple control drive signal. The drive circuit controls the multiple switching transistors to turn on or off based on the multiple control drive signals and outputs the multiple drive signals to the piezoelectric ceramic needle selector. Multiple piezoelectric ceramic plates of the piezoelectric ceramic needle selector are corresponding to the multiple drive signals. The piezoelectric ceramic needle selector controls the corresponding piezoelectric ceramic plate to deform based on the drive signals, driving the needle selection lever corresponding to the piezoelectric ceramic plate. This method significantly improves driving capability, reduces cost, and reduces latency, thereby meeting the requirements of complex knitting patterns for high response speed and strong driving capability.

Description

Technical Field

[0001] This application relates to the field of textile equipment technology, and in particular to a needle selection drive circuit for a piezoelectric ceramic needle selector and textile equipment. Background Technology

[0002] In automated textile equipment, the needle selector is a core component, used to control the raising and lowering of the knitting needles to achieve the weaving of complex patterns. The performance of the needle selector directly affects knitting efficiency, accuracy, and pattern complexity. Currently, electronic needle selectors mainly come in two types: electromagnetic and piezoelectric.

[0003] Electromagnetic needle selectors operate by switching on and off an electromagnet coil, but they suffer from problems such as electromagnetic interference, high energy consumption, severe heat generation, large size, and slow response. Piezoelectric ceramic needle selectors utilize the piezoelectric effect for driving, offering advantages such as low energy consumption, low heat generation, small size, and fast response, but they have weak driving capability, high cost, complex driving circuitry, and require high voltage.

[0004] Currently, most piezoelectric ceramic needle selectors use optocoupler drive, but optocouplers have problems such as weak driving capability, high cost, and high delay, making it difficult to meet the requirements of complex knitting patterns for high response speed and strong driving capability. Utility Model Content

[0005] This application mainly provides a needle selection drive circuit for a piezoelectric ceramic needle selector and textile equipment, which solves the problems of weak optocoupler drive capability, high cost, and high delay.

[0006] This application provides a needle selection drive circuit for a piezoelectric ceramic needle selector, including:

[0007] A signal input circuit, connected to a control bus, is used to receive multiple control signals, pin enable signals, and chip select signals from the control bus, and to output multiple control drive signals based on the multiple control signals, pin enable signals, and chip select signals;

[0008] The driving circuit is electrically connected to the signal input circuit and the piezoelectric ceramic needle selector, respectively, and is used to receive multiple control driving signals and output multiple driving signals to the piezoelectric ceramic needle selector based on the multiple control driving signals.

[0009] An overcurrent feedback circuit, connected to the drive circuit, is used to detect overcurrent in the needle selection drive circuit and output an overcurrent alarm signal when the current of the needle selection drive circuit is greater than a preset current limit value.

[0010] The protection circuit is connected to the overcurrent feedback circuit, the signal input circuit, and the control bus respectively. It is used to receive the overcurrent alarm signal, output the pin selection enable signal based on the overcurrent alarm signal, and control the drive circuit to stop outputting the drive signal.

[0011] The driving circuit includes multiple switching transistors, each corresponding to a multiple control signal. The driving circuit controls the multiple switching transistors to turn on or off based on the multiple control drive signals, and outputs the multiple drive signals to the piezoelectric ceramic needle selector. The piezoelectric ceramic needle selector has multiple piezoelectric ceramic plates corresponding to the multiple drive signals. The piezoelectric ceramic needle selector controls the corresponding piezoelectric ceramic plate to deform based on the drive signals, driving the needle selector corresponding to the piezoelectric ceramic plate.

[0012] The driving circuit includes multiple sub-driving circuits, each of which receives a corresponding control driving signal from the signal input circuit. The multiple sub-driving circuits are configured to correspond to multiple piezoelectric ceramic sheets, and each sub-driving circuit includes at least one switching transistor.

[0013] Each of the sub-driving circuits includes a first switching transistor and a second switching transistor. The first end of the first switching transistor is connected to the high-voltage source of the needle selection driving module, the second end of the first switching transistor is connected to the piezoelectric ceramic needle selector, and the third end of the first switching transistor is connected to the signal input circuit. The first end of the second switching transistor is connected to the common terminal of the needle selection driving module, the second end of the second switching transistor is connected between the second end of the first switching transistor and the piezoelectric ceramic needle selector, and the third end of the second switching transistor is connected to the signal input circuit.

[0014] The overcurrent feedback circuit includes a first overcurrent circuit and a second overcurrent circuit. The first input terminal of the first overcurrent circuit is connected to the high-voltage power supply of the needle selection drive module, the second input terminal of the first overcurrent circuit is connected to the high-voltage source, and the output terminal of the first overcurrent circuit is connected to the input terminal of the protection circuit. The input terminal of the second overcurrent circuit is connected to the common terminal, and the output terminal of the second overcurrent circuit is connected to both the output terminal of the first overcurrent circuit and the input terminal of the protection circuit.

[0015] Wherein, when the current in the needle selection drive circuit is less than the current limit value, the first overcurrent circuit is cut off and the second overcurrent circuit is cut off.

[0016] When the current of the first switching transistor is greater than the current limit value, the first overcurrent circuit is turned on, the second overcurrent circuit is turned off, and the first overcurrent circuit outputs the overcurrent alarm signal.

[0017] When the current of the second switching transistor is greater than the current limit value, the first overcurrent circuit is turned off, the second overcurrent circuit is turned on, and the second overcurrent circuit outputs the overcurrent alarm signal.

[0018] The protection circuit includes a logic conversion circuit and an overcurrent protection circuit. The input terminal of the overcurrent protection circuit is connected to the overcurrent feedback circuit. The first output terminal of the overcurrent protection circuit is connected to the control circuit. The second output terminal of the overcurrent protection circuit is connected to the first input terminal of the logic conversion circuit. The second input terminal of the logic conversion circuit is connected to the control circuit. The output terminal of the logic conversion circuit is connected to the signal input circuit.

[0019] Wherein, when the current of the needle selection driving circuit is less than the preset current limit value, the overcurrent protection circuit is disconnected. The overcurrent protection circuit is used to control the logic conversion circuit to output a first needle selection enable signal to the signal input circuit. The signal input circuit is used to control the driving circuit to output the driving signal based on the first needle selection enable signal.

[0020] When the current of the needle selection drive circuit is greater than the preset current limit value, the overcurrent protection circuit is used to receive the overcurrent alarm signal, and based on the overcurrent alarm signal being turned on, output a fault alarm signal to the control circuit, and control the logic conversion circuit to output a second needle selection enable signal to the signal input circuit. The signal input circuit is used to control the drive circuit to stop outputting the drive signal based on the second needle selection enable signal.

[0021] The overcurrent protection circuit includes a sixth switch, a seventh switch, an eighth switch, a first diode, a light-emitting diode, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, and a fifteenth resistor.

[0022] The third terminal of the sixth switch is connected to the overcurrent feedback circuit through the eighth resistor. One end of the seventh resistor is connected to one end of the eighth resistor, and the other end of the seventh resistor is grounded. One end of the ninth resistor is connected between the other end of the eighth resistor and the third terminal of the sixth switch, and the other end of the ninth resistor is grounded. The first terminal of the sixth switch is connected to the other end of the ninth resistor. The second terminal of the sixth switch is connected to the first terminal of the seventh switch, and the second terminal of the seventh switch is grounded. The third terminal of the seventh switch is connected to the second terminal of the seventh switch through the tenth resistor.

[0023] The negative terminal of the LED is connected between the third terminal of the seventh switch and the tenth resistor. The positive terminal of the LED is connected to the first terminal of the eighth switch through the fourteenth resistor. The first terminal of the eighth switch is connected to the first terminal of the logic conversion circuit. One end of the fifteenth resistor is connected between the first terminal of the eighth switch and the first terminal of the logic conversion circuit, and the other end of the fifteenth resistor is grounded. One end of the thirteenth resistor is connected to the second terminal of the logic conversion circuit. The second terminal of the eighth switch is connected between one end of the thirteenth resistor and the second terminal of the logic conversion circuit. The other end of the thirteenth resistor is connected to the negative terminal of the first LED through the twelfth resistor. The third terminal of the eighth switch is connected between the other end of the thirteenth resistor and the twelfth resistor. The negative terminal of the first LED is connected between the second terminal of the sixth switch and the first terminal of the seventh switch. The positive terminal of the first LED is connected to the first terminal of the control circuit. One end of the eleventh resistor receives a reference voltage, and the other end of the eleventh resistor is connected between the positive terminal of the first LED and the first terminal of the control circuit.

[0024] The logic conversion circuit includes a third logic chip and a sixteenth resistor. The first terminal of the third logic chip is connected to a DC power supply. The second terminal of the third logic chip is connected to one end of the thirteenth resistor. The third terminal of the third logic chip is connected to the first terminal of the eighth switching transistor. The third terminal of the third logic chip is connected to the signal input circuit. The fifth terminal of the third logic chip is connected to the second terminal of the control circuit. One end of the sixteenth resistor is connected between the fifth terminal of the third logic chip and the second terminal of the control circuit. The other end of the sixteenth resistor is grounded. The sixth terminal of the third logic chip is connected between one end of the sixteenth resistor and the fifth terminal of the third logic chip.

[0025] This application also provides a textile device including a piezoelectric ceramic needle selector and a needle selection drive circuit as described above.

[0026] The beneficial effects of this application are as follows: This application receives multiple control signals through a signal input circuit and outputs multiple control drive signals to a drive circuit. Multiple switching transistors in the drive circuit can be turned on and off according to the corresponding control drive signals, and output drive signals to the piezoelectric ceramic needle selector, so that the piezoelectric ceramic needle selector controls the corresponding piezoelectric ceramic sheet to deform, thereby driving the needle selector corresponding to the piezoelectric ceramic sheet to move. Compared with the optocoupler drive method, this application uses a drive circuit composed of multiple switching transistors to drive the piezoelectric ceramic needle selector, which significantly improves the driving capability, reduces costs, and has low latency, thereby meeting the requirements of complex knitting patterns for high response speed and strong driving capability. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0028] Figure 1 This is a schematic diagram of the structure of an embodiment of the needle selection drive circuit of the piezoelectric ceramic needle selector provided in this application;

[0029] Figure 2 This is a circuit diagram of one embodiment of the signal input circuit provided in this application;

[0030] Figure 3 This is a circuit diagram of one embodiment of the sub-driving circuit provided in this application;

[0031] Figure 4 This is a circuit diagram of one embodiment of the overcurrent feedback circuit provided in this application;

[0032] Figure 5 This is a circuit diagram of one embodiment of the protection circuit provided in this application;

[0033] Figure 6 This is a pin diagram of an embodiment of the pin selection driver module provided in this application. Detailed Implementation

[0034] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0036] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0037] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0039] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0040] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0041] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a connection between two components or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0042] Please see Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the structure of an embodiment of the needle selection drive circuit of the piezoelectric ceramic needle selector provided in this application; Figure 2This is a circuit diagram of one embodiment of the signal input circuit provided in this application. The pin selection drive circuit 100 of this embodiment includes a signal input circuit 20, a drive circuit 30, an overcurrent feedback circuit 40, and a protection circuit 50.

[0043] The signal input circuit 20 is connected to the control bus 10 and is used to receive multiple control signals, pin enable signals and chip select signals from the control bus 10, and output multiple control drive signals based on the multiple control signals, pin enable signals and chip select signals.

[0044] Optionally, the control bus 10 is a channel for transmitting control signals, transmitting control signals from a control circuit (not shown, such as a microcontroller) to the signal input circuit 20.

[0045] In some embodiments, after receiving multiple control signals, a pin select enable signal, and a chip select signal, the signal input circuit 20 converts the multiple control signals into multiple control drive signals according to the chip select signal when the pin select enable signal is active. For example, the control level of the drive circuit 30 is updated by using the rising edge of the chip select signal. The multiple control drive signals have a corresponding relationship with the multiple control signals, for example, many to one. In other embodiments, the correspondence between the multiple control drive signals and the multiple control signals is one-to-one or one-to-many.

[0046] The signal input circuit 20 includes, but is not limited to, a logic chip. In some embodiments, the signal input circuit 20 receives eight control signals from the control bus 10. The signal input circuit 20 includes a first logic chip 21 and a second logic chip 22, which share the eight control signals emitted by the control bus 10.

[0047] like Figure 2 As shown, both the first logic chip 21 and the second logic chip 22 include D0-D7 input pins, / OE input pins, and Q0-Q7 output pins. The first logic chip 21 includes a CP_P input pin, and the second logic chip 22 includes a CP_N input pin. The D0-D7 input pins of the first and second logic chips 21 and 22 are used to receive 8 control signals. The / OE input pins of the first and second logic chips 21 and 22 are used to receive select pin enable signals. The Q0-Q7 output pins of the first and second logic chips 21 and 22 correspond one-to-one with the D0-D7 output pins, and are used to output 16 control drive signals. The CP_P input pin of the first logic chip 21 and the CP_N input pin of the second logic chip 22 are used to receive chip select signals.

[0048] By adopting a time-sharing drive approach, different piezoelectric ceramic needle selectors can be controlled under the same hardware control bus 10, which greatly saves the resources of the control chip.

[0049] The drive circuit 30 is electrically connected to the signal input circuit 20 and the piezoelectric ceramic needle selector 60, respectively, and is used to receive multiple control drive signals and output multiple drive signals to the piezoelectric ceramic needle selector 60 based on the multiple control drive signals.

[0050] In some embodiments, the input terminal of the drive circuit 30 is electrically connected to the output terminal of the signal input circuit 20, and the output terminal of the drive circuit 30 is electrically connected to the piezoelectric ceramic needle selector 60. The drive circuit 30 receives multiple control drive signals from the signal input circuit 20, converts the multiple control drive signals into multiple drive signals, and transmits the multiple drive signals to the piezoelectric ceramic needle selector 60. In this embodiment, the correspondence between the multiple drive signals and the multiple control drive signals is one-to-many. For example, if the drive circuit 30 receives 16 control drive signals and outputs 8 drive signals, then the correspondence between the multiple drive signals and the multiple control drive signals is one-to-two.

[0051] like Figure 2 As shown, the driving circuit 30 receives multiple control driving signals through the Q0 to Q7 output pins of the first logic chip 21 and the second logic chip 22.

[0052] The overcurrent feedback circuit 40 is connected to the drive circuit 30 and is used to detect overcurrent in the needle selection drive circuit 100. When the current of the needle selection drive circuit 100 is greater than the preset current limit value, an overcurrent alarm signal is output.

[0053] Optionally, if the piezoelectric ceramic plate of the piezoelectric ceramic selector fails and short-circuits, the current in the selector drive circuit 100 may exceed the preset current limit value.

[0054] The protection circuit 50 is connected to the overcurrent feedback circuit 40, the signal input circuit 20 and the control bus 10 respectively. It is used to receive the overcurrent alarm signal, output the pin selection enable signal based on the overcurrent alarm signal, and control the drive circuit 30 to stop outputting the drive signal.

[0055] By adding an overcurrent feedback circuit 40 and a protection circuit 50, the drive circuit 30 can be shut down in time during an overcurrent fault, effectively reducing the loss from the fault.

[0056] The drive circuit 30 includes multiple switching transistors, each corresponding to a control drive signal. The drive circuit 30 controls the multiple switching transistors to turn on or off based on the control drive signals, and outputs the drive signals to the piezoelectric ceramic needle selector 60. The piezoelectric ceramic needle selector 60 has multiple piezoelectric ceramic plates corresponding to the drive signals. The piezoelectric ceramic needle selector 60 controls the corresponding piezoelectric ceramic plate to deform based on the drive signals, driving the needle selector corresponding to the piezoelectric ceramic plate.

[0057] In some embodiments, the correspondence between the multiple switching transistors and the multiple control drive signals is one-to-one. In other embodiments, the correspondence between the multiple switching transistors and the multiple control drive signals is one-to-many or many-to-one.

[0058] Optionally, the piezoelectric ceramic needle selector 60 has 8 piezoelectric ceramic plates inside, which correspond one-to-one with 8 driving signals. The piezoelectric ceramic needle selector 60 utilizes the inverse piezoelectric effect to generate micro-deformation by applying high voltage to different piezoelectric ceramic plates. The deformation is amplified by the mechanical structure to drive the needle selection lever to move. After the high voltage is removed, the deformation is restored and the position of the needle selection lever is returned to normal.

[0059] Optionally, the piezoelectric ceramic plate inside the piezoelectric ceramic needle selector 60 has a corresponding relationship with the needle selector lever, such as one-to-one or one-to-many.

[0060] In some embodiments, the microcontroller transmits multiple control signals, a pin selection enable signal, and a chip select signal to the signal input circuit 20 via the control bus 10. The signal input circuit 20 converts the multiple control signals into multiple control drive signals based on the valid pin selection enable signal and chip select signal, and sends these control drive signals to the drive circuit 30. The drive circuit 30 generates multiple drive signals based on the multiple control drive signals and sends these drive signals to the piezoelectric ceramic pin selector 60, so that the piezoelectric ceramic pin selector 60 drives the corresponding piezoelectric ceramic chip to produce chips according to the multiple drive signals. The deformation of the piezoelectric ceramic needle selector 60 drives the needle selector lever corresponding to the piezoelectric ceramic plate to move. At the same time, the overcurrent feedback circuit 40 performs overcurrent detection on the needle selector drive circuit 100. When the current of the needle selector drive circuit 100 is detected to be greater than the preset current limit value, an overcurrent alarm signal is generated and output. The protection circuit 50 receives the overcurrent alarm signal through the overcurrent feedback circuit 40 and generates and outputs a needle selector enable signal in the failure state according to the overcurrent alarm signal. The signal input circuit 20 controls the drive circuit 30 to stop outputting the drive signal according to the needle selector enable signal in the failure state, so that the piezoelectric ceramic needle selector 60 stops operating.

[0061] Optionally, when the overcurrent feedback circuit 40 detects that the current of the needle selection drive circuit 100 is less than the preset current limit value, the protection circuit 50 outputs a valid needle selection enable signal.

[0062] In this embodiment, the signal input circuit 20 receives multiple control signals and outputs multiple control drive signals to the drive circuit 30. Multiple switching transistors in the drive circuit 30 can be turned on and off according to the corresponding control drive signals, and output drive signals to the piezoelectric ceramic needle selector 60, so that the piezoelectric ceramic needle selector 60 controls the corresponding piezoelectric ceramic sheet to deform, thereby driving the needle selector corresponding to the piezoelectric ceramic sheet to move. Compared with the optocoupler drive method, this application uses a drive circuit 30 composed of multiple switching transistors to drive the piezoelectric ceramic needle selector 60, which significantly improves the driving capability, reduces the cost, and has low latency, thereby meeting the requirements of complex knitting patterns for high response speed and strong driving capability.

[0063] According to some embodiments of this application, see Figure 3 As shown, Figure 3 This is a circuit diagram of an embodiment of the sub-driving circuit provided in this application. The driving circuit 30 of this embodiment includes a plurality of sub-driving circuits 31. Each sub-driving circuit 31 receives a corresponding control driving signal from the signal input circuit 20. The plurality of sub-driving circuits 31 are correspondingly arranged with a plurality of piezoelectric ceramic sheets. Each sub-driving circuit 31 includes at least one switching transistor.

[0064] In some embodiments, multiple sub-driving circuits 31 correspond to multiple control driving signals, for example, one-to-many. Each sub-driving circuit 31 includes at least one switching transistor. The sub-driving circuit 31 receives the corresponding control driving signal through the signal input circuit 20 and controls the switching transistor to turn on or off according to the control driving signal to generate and output a driving signal. Each sub-driving circuit 31 corresponds to a multiple piezoelectric ceramic sheet. The piezoelectric ceramic needle selector 60 receives the driving signal through the driving circuit 30 and drives the corresponding piezoelectric ceramic sheet according to the driving signal.

[0065] For example, the drive circuit 30 receives 16 control drive signals from the signal input circuit 20. The drive circuit 30 includes 8 sub-drive circuits 31, and the piezoelectric ceramic needle selector 60 includes 8 piezoelectric ceramic plates. The correspondence between the 8 sub-drive circuits 31 and the 16 control drive signals is one-to-two, and the 8 sub-drive circuits 31 correspond one-to-one with the 8 piezoelectric ceramic plates. The sub-drive circuit 31 receives the two corresponding control drive signals, generates and outputs the drive signal corresponding to the control drive signal, and drives the corresponding piezoelectric ceramic plate.

[0066] The driving circuit 30 in this embodiment includes multiple sub-driving circuits 31. By setting multiple sub-driving circuits 31 in correspondence with multiple piezoelectric ceramic plates, the movement of the piezoelectric ceramic plates corresponding to the sub-driving circuits 31 can be precisely controlled, ensuring that each piezoelectric ceramic plate can move independently according to specific needs, thereby achieving precise driving of the needle selection lever and meeting the needle selection accuracy requirements of complex knitting patterns.

[0067] According to some embodiments of this application, see Figure 3 As shown, each sub-driving circuit 31 in this embodiment includes a first switching transistor Q1 and a second switching transistor Q2. The first end of the first switching transistor Q1 is connected to the high voltage source +200V of the needle selection driving module 200, the second end of the first switching transistor Q1 is connected to the piezoelectric ceramic needle selector 60, and the third end of the first switching transistor Q1 is connected to the signal input circuit 20. The first end of the second switching transistor Q2 is connected to the common terminal COM of the needle selection driving module 200, the second end of the second switching transistor Q2 is connected between the second end of the first switching transistor Q1 and the piezoelectric ceramic needle selector 60, and the third end of the second switching transistor Q2 is connected to the signal input circuit 20.

[0068] The common terminal COM refers to the physical port or logic interface shared by multiple circuits in the pin selection drive circuit 100. The common terminal can be a live wire, neutral wire, positive or negative terminal, and is used to provide a stable reference potential for the circuits in the pin selection drive circuit 100 (such as the drive circuit 30 and the overcurrent feedback circuit 40).

[0069] See Figure 6 As shown, Figure 6 This is a pin diagram of one embodiment of the needle selection drive module provided in this application. The needle selection drive module 200 of this embodiment integrates a signal input circuit 20, a drive circuit 30, an overcurrent feedback circuit 40, a protection circuit 50, and a piezoelectric ceramic needle selector 60.

[0070] In this embodiment, multiple needle selection drive modules 200 are mounted on a single control bus 10, enabling a single control bus 10 to control multiple piezoelectric ceramic needle selectors 60.

[0071] Optionally, the third terminal of the first switch Q1 is connected to an output pin of the first logic chip 21 through another transition circuit; the third terminal of the second switch Q2 is connected to an output pin of the second logic chip 22 through another transition circuit, and the output pin of the second logic chip 22 corresponds to the output pin of the first logic chip 21; at this time, the sub-driving circuit 31 receives two control driving signals, controls the conduction and disconnection of the first switch Q1 and the second switch Q2 according to the two control driving signals, and outputs a driving signal.

[0072] For example, such as Figure 3As shown, the IN_P1 input pin of the sub-driver circuit 31 corresponds to the Q0 output pin of the first logic chip 21, and the IN_N1 input pin of the sub-driver circuit 31 corresponds to the Q0 output pin of the second logic chip 22. Optionally, the O1 output pin of the sub-driver circuit 31 is used to output a drive signal corresponding to the two control drive signals output by the two Q0 output pins. Further, since the driver circuit 30 includes eight sub-driver circuits 31, the driver circuit 30 includes O1 to O8 output pins for outputting eight drive signals.

[0073] like Figure 3 As shown, the first switch Q1 and the second switch Q2 of the sub-drive circuit 31 form a driving half-bridge. The first switch Q1 is the upper bridge arm, with its source connected to the high-voltage source +200V and its drain connected to the output terminal of the sub-drive circuit 31. The second switch Q2 is the lower bridge arm, with its source connected to the common terminal COM and its drain connected to the output terminal of the sub-drive circuit 31. The output terminal of the sub-drive circuit 31 is connected to the input terminal of the piezoelectric ceramic needle selector 60. By controlling the on / off state of the first switch Q1 and the second switch Q2 respectively, high and low voltages are output to the piezoelectric ceramic sheet of the piezoelectric ceramic needle selector 60.

[0074] For example, when the first switch Q1 is turned on and the second switch Q2 is turned off, the sub-drive circuit 31 outputs a high-level drive signal to the piezoelectric ceramic needle selector 60, driving the piezoelectric ceramic sheet corresponding to the sub-drive circuit 31.

[0075] Optionally, the first switch Q1 and the second switch Q2 are PMOS transistors, the first terminal of the first switch Q1 and the first terminal of the second switch Q2 are the source, the second terminal of the first switch Q1 and the second terminal of the second switch Q2 are the drain, and the third terminal of the first switch Q1 and the second switch Q2 are the gate.

[0076] According to some embodiments of this application, see Figure 4 As shown, Figure 4 This is a circuit diagram of one embodiment of the overcurrent feedback circuit provided in this application. The overcurrent feedback circuit 40 of this embodiment includes a first overcurrent circuit 41 and a second overcurrent circuit 42.

[0077] The first input terminal of the first overcurrent circuit 41 is connected to the high-voltage power supply HV of the needle selection drive module 200, the second input terminal of the first overcurrent circuit 41 is connected to the high-voltage source +200V, and the output terminal of the first overcurrent circuit 41 is connected to the input terminal of the protection circuit 50. The input terminal of the second overcurrent circuit 42 is connected to the common terminal COM, and the output terminal of the second overcurrent circuit 42 is connected to both the output terminal of the first overcurrent circuit 41 and the input terminal of the protection circuit 50.

[0078] In some embodiments, the first overcurrent circuit 41 is used for overcurrent detection of the first switch Q1 (upper bridge arm), and the second overcurrent circuit 42 is used for overcurrent detection of the second switch Q2 (lower bridge arm).

[0079] According to some embodiments of this application, when the current of the needle selection drive circuit 100 is less than the current limit value, the first overcurrent circuit 41 is cut off and the second overcurrent circuit 42 is cut off.

[0080] When the current of the first switching transistor Q1 exceeds the current limit, the first overcurrent circuit 41 is turned on, the second overcurrent circuit 42 is turned off, and the first overcurrent circuit 41 outputs an overcurrent alarm signal.

[0081] When the current of the second switching transistor Q2 exceeds the current limit, the first overcurrent circuit 41 is cut off, the second overcurrent circuit 42 is turned on, and the second overcurrent circuit 42 outputs an overcurrent alarm signal.

[0082] In some embodiments, an overcurrent problem occurs when the drive arm (first switch Q1 and second switch Q2) is shoot-through or the drive device malfunctions. In this case, if the upper arm is shoot-through and the lower arm is not, the current of the first switch Q1 is greater than the current limit value, the first overcurrent circuit 41 is turned on, the second overcurrent circuit 42 is turned off, and the first overcurrent circuit 41 outputs a low-level overcurrent alarm signal. If the lower arm is shoot-through and the upper arm is not, the current of the second switch Q2 is greater than the current limit value, the first overcurrent circuit 41 is turned off, the second overcurrent circuit 42 is turned on, and the second overcurrent circuit 42 outputs a low-level overcurrent alarm signal.

[0083] This embodiment, through the configuration of the first overcurrent circuit 41 and the second overcurrent circuit 42, can quickly provide feedback on the overcurrent of the needle selection drive circuit 100.

[0084] In some embodiments, such as Figure 4As shown, the second overcurrent protection circuit 42 includes a third switch Q3, a first resistor R1, and a second resistor R2. One end of the first resistor R1 is connected to the common terminal COM, and the other end of the first resistor R1 is grounded. The first end of the third switch Q3 is connected to the other end of the first resistor R1, the second end of the third switch Q3 is connected to the output terminal of the first overcurrent circuit 41 and the input terminal of the protection circuit 50, respectively, and the third end of the third switch Q3 is connected to one end of the first resistor R1 through the second resistor R2. The first overcurrent circuit 41 includes a fourth switch Q4, a fifth switch Q5, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. The first terminal of the fourth switch Q4 is connected to the high-voltage power supply HV. The second terminal of the fourth switch Q4 is grounded through the fifth resistor R5 and the sixth resistor R6. The third terminal of the fourth switch Q4 is connected to the high-voltage source +200V through the fourth resistor R4. One end of the third resistor R3 is connected between the first terminal of the fourth switch Q4 and the high-voltage power supply HV, and the other end of the third resistor R3 is connected between the high-voltage source +200V and the fourth resistor R4. The first terminal of the fifth switch Q5 is connected to the ground terminal of the sixth resistor R6. The second terminal of the fifth switch Q5 is connected to the second terminal of the third switch Q3. The third terminal of the fifth switch Q5 is connected between the fifth resistor R5 and the sixth resistor R6.

[0085] Among them, the first resistor R1 is the current sensing resistor of the lower bridge arm (the second switch Q2), and the third resistor R3 is the current sensing resistor of the upper bridge arm (the first switch Q1); the overcurrent feedback circuit 40 includes an OCP output pin, which is used to connect to the protection circuit 50 and output an overcurrent alarm signal.

[0086] In some embodiments, when the current of the needle selection drive circuit 100 is less than the current limit value, the third switch Q3, the fourth switch Q4 and the fifth switch Q5 are all turned off, and the overcurrent feedback circuit 40 outputs a high level.

[0087] In some embodiments, when the current of the first switch Q1 is greater than the current limit value, the fourth switch Q4 is turned on. Through the voltage division of the fifth resistor R5 and the sixth resistor R6, the fifth switch Q5 is turned on, and a low-level overcurrent alarm signal is output.

[0088] In some embodiments, the current limiting value is the ratio of the voltage Vbe between the base and emitter of the third switch Q3 to the first resistor R1, i.e., Vbe / R1; when the current of the second switch Q2 is greater than the current limiting value, the third switch Q3 is turned on and outputs a low-level overcurrent alarm signal.

[0089] Optionally, the third switch Q3 and the fifth switch Q5 are NPN transistors, with the first terminal of the third switch Q3 and the first terminal of the fifth switch Q5 serving as emitters, the second terminal of the third switch Q3 and the second terminal of the fifth switch Q5 serving as collectors, and the third terminal of the third switch Q3 and the third terminal of the fifth switch Q5 serving as bases. The fourth switch Q4 is a PNP transistor, with the first terminal of the fourth switch Q4 serving as the emitter, the second terminal of the fourth switch Q4 serving as the collector, and the third terminal of the fourth switch Q4 serving as the base. In other embodiments, the third switch Q3, the fourth switch Q4, and the fifth switch Q5 are other switching transistors, such as MOSFETs.

[0090] In this embodiment, an overcurrent feedback circuit 40 composed of the third switch Q3, the fourth switch Q4, and the fifth switch Q5 enables the timely issuance of an overcurrent alarm signal (hardware overcurrent alarm) to the protection circuit 50 to perform protection actions when overcurrent problems occur, such as the drive bridge arm of the first switch Q1 and the second switch Q2 being shot-through, the drive bridge arm device being faulty, or the piezoelectric ceramic sheet being damaged and short-circuited.

[0091] According to some embodiments of this application, see Figure 5 As shown, Figure 5 This is a circuit diagram of one embodiment of the protection circuit provided in this application. The protection circuit 50 of this embodiment includes a logic conversion circuit 52 and an overcurrent protection circuit 51. The input terminal of the overcurrent protection circuit 51 is connected to the overcurrent feedback circuit 40, the first output terminal of the overcurrent protection circuit 51 is connected to the control circuit, the second output terminal of the overcurrent protection circuit 51 is connected to the first input terminal of the logic conversion circuit 52, the second input terminal of the logic conversion circuit 52 is connected to the control circuit, and the output terminal of the logic conversion circuit 52 is connected to the signal input circuit 20.

[0092] According to some embodiments of this application, when the current of the needle selection drive circuit 100 is less than a preset current limit value, the overcurrent protection circuit 51 is disconnected, the overcurrent protection circuit 51 controls the logic conversion circuit 52 to output a first needle selection enable signal to the signal input circuit 20, and the signal input circuit 20 controls the drive circuit 30 to output a drive signal based on the first needle selection enable signal.

[0093] When the current of the needle selection drive circuit 100 exceeds the preset current limit, the overcurrent protection circuit 51 receives an overcurrent alarm signal. Based on the overcurrent alarm signal, the overcurrent protection circuit 51 is turned on and outputs a fault alarm signal to the control circuit. It also controls the logic conversion circuit 52 to output a second needle selection enable signal to the signal input circuit 20. Based on the second needle selection enable signal, the signal input circuit 20 controls the drive circuit 30 to stop outputting drive signals.

[0094] In some embodiments, the first selector enable signal is low and the second selector enable signal is high. In other embodiments, the first selector enable signal is high and the second selector enable signal is low.

[0095] In some embodiments, when the current of the needle selection drive circuit 100 is less than a preset current limit, the protection circuit 50 is in a stopped state, the overcurrent protection circuit 51 is disconnected, and the overcurrent protection circuit 51 controls the logic conversion circuit 52 to output a first needle selection enable signal to the signal input circuit 20, so that the signal input circuit 20 controls the drive circuit 30 to output a drive signal normally according to the first needle selection enable signal; when the current of the needle selection drive circuit 100 is greater than the preset current limit, the protection circuit 50 is in a working state, the overcurrent protection circuit 51 receives an overcurrent alarm signal through the overcurrent feedback circuit 40, and outputs a fault alarm signal to the control circuit according to the overcurrent alarm signal, so that the control circuit performs maintenance actions based on the fault alarm signal; at the same time, the overcurrent protection circuit 51 controls the logic conversion circuit 52 to output a second needle selection enable signal to the signal input circuit 20, so that the signal input circuit 20 controls the drive circuit 30 to stop outputting a drive signal according to the second needle selection enable signal.

[0096] In this embodiment, the overcurrent protection circuit 51 outputs a fault alarm signal to the control circuit and controls the logic conversion circuit to output the second needle selection enable signal. When an overcurrent occurs in the needle selection drive circuit 100, the control circuit is promptly alerted to take further protective measures and the drive circuit 30 outputs the drive signal in a timely manner.

[0097] According to some embodiments of this application, see Figure 5 As shown, the overcurrent protection circuit 51 in this embodiment includes a sixth switch Q6, a seventh switch Q7, an eighth switch Q8, a first diode D1, a light-emitting diode D2, 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 thirteenth resistor R13, a fourteenth resistor R14, and a fifteenth resistor R15.

[0098] In this circuit, the third terminal of the sixth switch Q6 is connected to the overcurrent feedback circuit 40 through the eighth resistor R8; one end of the seventh resistor R7 is connected to one end of the eighth resistor R8, and the other end of the seventh resistor R7 is grounded; one end of the ninth resistor R9 is connected between the other end of the eighth resistor R8 and the third terminal of the sixth switch Q6, and the other end of the ninth resistor R9 is grounded; the first terminal of the sixth switch Q6 is connected to the other end of the ninth resistor R9; the second terminal of the sixth switch Q6 is connected to the first terminal of the seventh switch Q7, and the second terminal of the seventh switch Q7 is grounded; and the third terminal of the seventh switch Q7 is connected to the second terminal of the seventh switch Q7 through the tenth resistor R10.

[0099] The negative terminal of LED D2 is connected between the third terminal of the seventh switch Q7 and the tenth resistor R10. The positive terminal of LED D2 is connected to the first terminal of the eighth switch Q8 through the fourteenth resistor R14. The first terminal of the eighth switch Q8 is connected to the first terminal of the logic conversion circuit 52. One end of the fifteenth resistor R15 is connected between the first terminal of the eighth switch Q8 and the first terminal of the logic conversion circuit 52, and the other end of the fifteenth resistor R15 is grounded. One end of the thirteenth resistor R13 is connected to the second terminal of the logic conversion circuit 52, and the second terminal of the eighth switch Q8 is connected to one end of the thirteenth resistor R13 and the logic conversion circuit 52. Between the second terminals of the switching circuit 52, the other end of the thirteenth resistor R13 is connected to the cathode of the first diode D1 through the twelfth resistor R12. The third terminal of the eighth switch Q8 is connected between the other end of the thirteenth resistor R13 and the twelfth resistor R12. The cathode of the first diode D1 is connected between the second terminal of the sixth switch Q6 and the first terminal of the seventh switch Q7. The anode of the first diode D1 is connected to the first terminal of the control circuit. One end of the eleventh resistor R11 receives the reference voltage +3.3V, and the other end of the eleventh resistor R11 is connected between the anode of the first diode D1 and the first terminal of the control circuit.

[0100] Optionally, the sixth switch Q6 and the seventh switch Q7 are NPN transistors, with the first terminal of the sixth switch Q6 and the second terminal of the seventh switch Q7 serving as emitters, the second terminal of the sixth switch Q6 and the first terminal of the seventh switch Q7 serving as collectors, and the third terminal of the sixth switch Q6 and the third terminal of the seventh switch Q7 serving as bases. The eighth switch Q8 is a PNP transistor, with the first terminal of the eighth switch Q8 serving as the collector, the second terminal of the eighth switch Q8 serving as the emitter, and the third terminal of the eighth switch Q8 serving as the base. In other embodiments, the sixth switch Q6, the seventh switch Q7, and the eighth switch Q8 are other switching transistors, such as MOSFETs.

[0101] According to some embodiments of this application, the logic conversion circuit 52 includes a third logic chip 521 and a sixteenth resistor R16. The first terminal of the third logic chip 521 is connected to a DC power supply D5V. The second terminal of the third logic chip 521 is connected to one end of the thirteenth resistor R13. The third terminal of the third logic chip 521 is connected to the first terminal of the eighth switch Q8. The third terminal of the third logic chip 521 is connected to the signal input circuit 20. The fifth terminal of the third logic chip 521 is connected to the second terminal of the control circuit. One end of the sixteenth resistor R16 is connected between the fifth terminal of the third logic chip 521 and the second terminal of the control circuit. The other end of the sixteenth resistor R16 is grounded. The sixth terminal of the third logic chip 521 is connected between one end of the sixteenth resistor R16 and the fifth terminal of the third logic chip 521.

[0102] The protection circuit 50 includes a / FLT_XZQ output pin, an / OE output pin, an OE input pin, and an OCP input pin. The / FLT_XZQ output pin is used to output a fault alarm signal to the control circuit. The / OE output pin corresponds to the / OE input pin of the signal input circuit 20 and is used to output a first selector enable signal or a second selector enable signal to the signal input circuit 20. The OE input pin is used to receive the enable signal output by the control circuit. The OCP input pin corresponds to the OCP output pin of the overcurrent feedback circuit 40 and is used to receive an overcurrent alarm signal.

[0103] In some embodiments, when the current of the needle selection driving circuit 100 is less than a preset current limit, the sixth switch Q6, the seventh switch Q7, and the eighth switch Q8 are turned off. The output of the overcurrent protection circuit 51 to the third logic chip 521 is pulled down to a low level through the fifteenth resistor R15. The third logic chip 521 outputs a first needle selection enable signal to the signal input circuit 20, and the output of the overcurrent protection circuit 51 to the control circuit is pulled up to a high level through the eleventh resistor R11, thus entering a non-alarm state. When the current of the needle selection driving circuit 100 is greater than a preset current limit, the sixth switch Q6, the seventh switch Q7, and the eighth switch Q8 are turned off. When the current limit is reached, the overcurrent protection circuit 51 receives an overcurrent alarm signal, the sixth switch Q6 is turned on, and the fault alarm signal output by the overcurrent protection circuit 51 to the control circuit is pulled down to a low level, issuing an alarm to the control circuit; at the same time, the eighth switch Q8 is turned on, the output of the overcurrent protection circuit 51 to the third logic chip 521 is pulled up to a high level, and the third logic chip 521 outputs the second selection pin enable signal to the signal input circuit 20; and because the eighth switch Q8 is turned on, the light-emitting diode D2 lights up, the seventh switch Q7 is turned on, and the fault state is maintained.

[0104] In this embodiment, when the eighth switch Q8 is turned on, the light-emitting diode D2 lights up, and at the same time the seventh switch Q7 is turned on, maintaining the fault state continuously. This provides an intuitive status indication, making it convenient for operators to detect and handle faults in a timely manner, reducing equipment downtime and maintenance costs.

[0105] like Figure 6As shown, the pin selection driver module 200 includes D0-D7 input pins, / OE input pin, CK_P input pin, CK_N input pin, OCP output pin, HV input pin, and O1-O8 output pins. Specifically, the D0-D7 input pins correspond one-to-one with the D0-D7 input pins of the first logic chip 21 and the second logic chip 22 in the signal input circuit 20; the / OE input pin corresponds to the / OE input pin of the first logic chip 21 and the second logic chip 22; the CK_P input pin corresponds to the CP_P input pin of the first logic chip 21; the CK_N input / output pin corresponds to the CP_N input pin of the second logic chip 22; the OCP output pin corresponds to the OCP output pin of the overcurrent feedback circuit 40; the HV input pin corresponds to the high-voltage power supply HV of the overcurrent feedback circuit 40 (HV input pin); and the O1-O8 output pins correspond to the O1-O8 output pins of the driver circuit 30.

[0106] Another embodiment of this application provides a textile device, including a piezoelectric ceramic needle selector and the needle selection drive circuit 100 of the above embodiment. The textile device includes, but is not limited to, a flat knitting machine, a sock knitting machine, or a glove knitting machine.

[0107] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A selection drive circuit for a piezoelectric ceramic needle selection device, characterized by comprising: include: A signal input circuit, connected to a control bus, is used to receive multiple control signals, pin enable signals, and chip select signals from the control bus, and to output multiple control drive signals based on the multiple control signals, pin enable signals, and chip select signals; The driving circuit is electrically connected to the signal input circuit and the piezoelectric ceramic needle selector, respectively, and is used to receive multiple control driving signals and output multiple driving signals to the piezoelectric ceramic needle selector based on the multiple control driving signals. An overcurrent feedback circuit, connected to the drive circuit, is used to detect overcurrent in the needle selection drive circuit and output an overcurrent alarm signal when the current of the needle selection drive circuit is greater than a preset current limit value. The protection circuit is connected to the overcurrent feedback circuit, the signal input circuit, and the control bus respectively. It is used to receive the overcurrent alarm signal, output the pin selection enable signal based on the overcurrent alarm signal, and control the drive circuit to stop outputting the drive signal. The driving circuit includes multiple switching transistors, each corresponding to a multiple control driving signal. The driving circuit controls the multiple switching transistors to turn on or off based on the multiple control driving signals, and outputs the multiple driving signals to the piezoelectric ceramic needle selector. The piezoelectric ceramic needle selector has multiple piezoelectric ceramic plates corresponding to the multiple driving signals. The piezoelectric ceramic needle selector controls the corresponding piezoelectric ceramic plate to deform based on the driving signals, driving the needle selector corresponding to the piezoelectric ceramic plate.

2. The needle selection drive circuit of claim 1, wherein, The driving circuit includes multiple sub-driving circuits. Each sub-driving circuit receives a corresponding control driving signal from the signal input circuit. The multiple sub-driving circuits are arranged correspondingly to multiple piezoelectric ceramic sheets. Each sub-driving circuit includes at least one switching transistor.

3. The needle selection drive circuit of claim 2, wherein, Each of the sub-driving circuits includes a first switching transistor and a second switching transistor. The first terminal of the first switching transistor is connected to the high-voltage source of the needle selection driving module, the second terminal of the first switching transistor is connected to the piezoelectric ceramic needle selector, and the third terminal of the first switching transistor is connected to the signal input circuit. The first terminal of the second switching transistor is connected to the common terminal of the needle selection driving module, the second terminal of the second switching transistor is connected between the second terminal of the first switching transistor and the piezoelectric ceramic needle selector, and the third terminal of the second switching transistor is connected to the signal input circuit.

4. The needle selection drive circuit according to any one of claims 1 to 3, characterized in that The overcurrent feedback circuit includes a first overcurrent circuit and a second overcurrent circuit. The first input terminal of the first overcurrent circuit is connected to the high-voltage power supply of the needle selection drive module, the second input terminal of the first overcurrent circuit is connected to the high-voltage source, and the output terminal of the first overcurrent circuit is connected to the input terminal of the protection circuit. The input terminal of the second overcurrent circuit is connected to a common terminal, and the output terminal of the second overcurrent circuit is connected to the output terminal of the first overcurrent circuit and the input terminal of the protection circuit, respectively.

5. The needle selection drive circuit of claim 4, wherein, When the current in the needle selection drive circuit is less than the current limit value, the first overcurrent circuit is cut off, and the second overcurrent circuit is cut off. When the current of the first switching transistor is greater than the current limit value, the first overcurrent circuit is turned on, the second overcurrent circuit is turned off, and the first overcurrent circuit outputs the overcurrent alarm signal. When the current of the second switching transistor exceeds the current limit value, the first overcurrent circuit is turned off, the second overcurrent circuit is turned on, and the second overcurrent circuit outputs the overcurrent alarm signal.

6. The needle selection drive circuit of claim 4, wherein, The protection circuit includes a logic conversion circuit and an overcurrent protection circuit. The input terminal of the overcurrent protection circuit is connected to the overcurrent feedback circuit. The first output terminal of the overcurrent protection circuit is connected to the control circuit. The second output terminal of the overcurrent protection circuit is connected to the first input terminal of the logic conversion circuit. The second input terminal of the logic conversion circuit is connected to the control circuit. The output terminal of the logic conversion circuit is connected to the signal input circuit.

7. The needle selection drive circuit of claim 6, wherein, When the current of the needle selection drive circuit is less than the preset current limit value, the overcurrent protection circuit is disconnected. The overcurrent protection circuit is used to control the logic conversion circuit to output a first needle selection enable signal to the signal input circuit. The signal input circuit is used to control the drive circuit to output the drive signal based on the first needle selection enable signal. When the current of the needle selection drive circuit is greater than the preset current limit value, the overcurrent protection circuit is used to receive the overcurrent alarm signal, and based on the overcurrent alarm signal being turned on, output a fault alarm signal to the control circuit, and control the logic conversion circuit to output a second needle selection enable signal to the signal input circuit. The signal input circuit is used to control the drive circuit to stop outputting the drive signal based on the second needle selection enable signal.

8. The needle selection drive circuit of claim 6, wherein, The overcurrent protection circuit includes a sixth switch, a seventh switch, an eighth switch, a first diode, a light-emitting diode, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, and a fifteenth resistor. The third terminal of the sixth switch is connected to the overcurrent feedback circuit through the eighth resistor. One end of the seventh resistor is connected to one end of the eighth resistor, and the other end of the seventh resistor is grounded. One end of the ninth resistor is connected between the other end of the eighth resistor and the third terminal of the sixth switch, and the other end of the ninth resistor is grounded. The first terminal of the sixth switch is connected to the other end of the ninth resistor. The second terminal of the sixth switch is connected to the first terminal of the seventh switch, and the second terminal of the seventh switch is grounded. The third terminal of the seventh switch is connected to the second terminal of the seventh switch through the tenth resistor. The negative terminal of the LED is connected between the third terminal of the seventh switch and the tenth resistor. The positive terminal of the LED is connected to the first terminal of the eighth switch through the fourteenth resistor. The first terminal of the eighth switch is connected to the first terminal of the logic conversion circuit. One end of the fifteenth resistor is connected between the first terminal of the eighth switch and the first terminal of the logic conversion circuit, and the other end of the fifteenth resistor is grounded. One end of the thirteenth resistor is connected to the second terminal of the logic conversion circuit. The second terminal of the eighth switch is connected between one end of the thirteenth resistor and the second terminal of the logic conversion circuit. The other end of the thirteenth resistor is connected to the negative terminal of the first LED through the twelfth resistor. The third terminal of the eighth switch is connected between the other end of the thirteenth resistor and the twelfth resistor. The negative terminal of the first LED is connected between the second terminal of the sixth switch and the first terminal of the seventh switch. The positive terminal of the first LED is connected to the first terminal of the control circuit. One end of the eleventh resistor receives a reference voltage, and the other end of the eleventh resistor is connected between the positive terminal of the first LED and the first terminal of the control circuit.

9. The needle selection drive circuit according to claim 8, characterized in that, The logic conversion circuit includes a third logic chip and a sixteenth resistor. The first terminal of the third logic chip is connected to a DC power supply. The second terminal of the third logic chip is connected to one end of the thirteenth resistor. The third terminal of the third logic chip is connected to the first terminal of the eighth switching transistor. The third terminal of the third logic chip is connected to the signal input circuit. The fifth terminal of the third logic chip is connected to the second terminal of the control circuit. One end of the sixteenth resistor is connected between the fifth terminal of the third logic chip and the second terminal of the control circuit. The other end of the sixteenth resistor is grounded. The sixth terminal of the third logic chip is connected between one end of the sixteenth resistor and the fifth terminal of the third logic chip.

10. A textile apparatus, characterized by, It includes a piezoelectric ceramic needle selector and a needle selector drive circuit as described in any one of claims 1-9.

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