Sewing machine control circuit and sewing machine

Abstract

The utility model relates to a sewing machine control circuit and a sewing machine. The control circuit comprises a first control chip, a second control chip, an isolation unit and a panel unit. The first control chip is used for outputting a control level to control a working motor of the sewing machine to act; the first control chip is connected with the second control chip through the isolation unit and is used for receiving first data sent by the second control chip or sending second data to the second control chip; the second control chip is connected with the panel unit and is used for sending the second data to the panel unit or receiving the data generated by the panel unit and generating the first data. Through the control circuit, the data transmission architecture of the panel circuit in the sewing machine can be optimized, and the data transmission efficiency is improved while the circuit structure is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, and more specifically, to a sewing machine control circuit and a sewing machine. Background Art

[0002] In the current working circuit of a sewing machine, during the data transmission process in the internal working circuit of the sewing machine, the data on the panel of the sewing machine is usually transmitted through a low-speed optocoupler circuit. The internal control IC of the sewing machine transmits panel operation or display data to and from the panel circuit through the low-speed optocoupler circuit. This circuit structure is relatively complex, and the data transmission through the optocoupler circuit makes the entire data process inefficient and the data transmission slow. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a sewing machine control circuit and a sewing machine for the above-mentioned partial technical defects of the prior art.

[0004] The technical solution adopted by the utility model to solve its technical problem is to construct a sewing machine control circuit, including: a first control chip, a second control chip, an isolation unit, and a panel unit; the first control chip is used to output a control level to control the operation of the working motor of the sewing machine; and the first control chip is connected to the second control chip through the isolation unit, and is used to receive the first data sent by the second control chip or send the second data to the second control chip; the second control chip is connected to the panel unit, and is used to send the second data to the panel unit or receive the data generated by the panel unit and generate the first data.

[0005] Preferably, in an embodiment of the sewing machine control circuit provided by the utility model, the isolation unit includes an isolation chip U13, and resistors R91, R95, R92, and R96;

[0006] The second pin of the isolation chip U13 is connected to the first output pin of the second control chip through the resistor R91, and the third pin of the isolation chip U13 is connected to the first input pin of the second control chip through the resistor R95;

[0007] The seventh pin of the isolation chip U13 is connected to the first input pin of the first control chip through the resistor R92, and the sixth pin of the isolation chip U13 is connected to the first output pin of the first control chip through the resistor R96;

[0008] The first pin and the eighth pin of the isolation chip U13 are respectively connected to the power supply, and the fourth pin and the fifth pin of the isolation chip U13 are respectively grounded.

[0009] Preferably, in an embodiment of the sewing machine control circuit provided by the present utility model, the panel unit includes a connector CN5 for connecting the sewing machine panel circuit, as well as a panel circuit power supply switch, a resistor R199, a resistor R204, a capacitor C97, a capacitor C98, a capacitor C99, and a triode Q18;

[0010] The fourth pin of the connector CN5 is connected to the first end of the resistor R199 and the first end of the capacitor C99. The second end of the resistor R199 is connected to the third output pin of the second control chip. The third pin of the connector CN5 is connected to the first end of the resistor R204 and the first end of the capacitor C98. The second end of the resistor R204 is connected to the third input pin of the second control chip;

[0011] The second pin of the connector CN5 is connected to the first end of the capacitor C97 and the panel circuit power supply switch. The first pin of the connector CN5, the second end of the capacitor C97, the second end of the capacitor C98, and the second end of the capacitor C99 are grounded.

[0012] Preferably, in an embodiment of the sewing machine control circuit provided by the present utility model, the panel circuit power supply switch includes a MOS transistor Q18, a resistor R192, a resistor R194, and a resistor R197;

[0013] The gate of the MOS transistor Q18 is connected to the first end of the resistor R194 and the first end of the resistor R192. The source of the MOS transistor Q18, the second end of the resistor R192, and the first end of the resistor R197 are connected to a power supply. The drain of the MOS transistor Q18 and the second end of the resistor R197 are connected to the second pin of the connector CN5. The second end of the resistor R194 is used to receive a control level.

[0014] Preferably, in an embodiment of the sewing machine control circuit provided by the present utility model, the control circuit further includes at least one of a PWM signal output unit, an IO port expansion unit, and a panel circuit expansion unit;

[0015] The second control chip is respectively connected to the PWM signal output unit, the IO port expansion unit, and the panel circuit expansion unit, and is used for sending the second data to the PWM signal output unit, the IO port expansion unit, or the panel circuit expansion unit, or

[0016] receiving the data generated by the IO port expansion unit or the panel circuit expansion unit and generating the first data.

[0017] Preferably, in an embodiment of the sewing machine control circuit provided by the present utility model, the PWM signal output unit includes at least one PWM signal output subunit, and each PWM signal output subunit includes a valve connector for connecting to a solenoid valve, a Darlington amplifier, and a valve drive switch;

[0018] The input end of the Darlington amplifier is connected to the PWM signal output pin of the second control chip, the output end of the Darlington amplifier is connected to the control end of the valve drive switch, the first end of the valve drive switch is connected to the first end of the valve connector, the second end of the valve connector is connected to a power supply, and the second end of the valve drive switch is grounded.

[0019] Preferably, in an embodiment of the sewing machine control circuit provided by the present utility model, all the Darlington amplifiers are integrated in a Darlington chip U18, and the valve connectors are integrated in a connector J4.

[0020] Preferably, in an embodiment of the sewing machine control circuit provided by the present utility model, the IO port expansion unit includes a connector CN50 for externally connecting an IO device, and an IO device power supply switch, a resistor R1990, a resistor R2040, a capacitor C970, a capacitor C980, and a capacitor C990;

[0021] The fourth pin of the connector CN50 is connected to the first end of the resistor R1990 and the first end of the capacitor C990, the second end of the resistor R1990 is connected to the fourth output pin of the second control chip, the third pin of the connector CN50 is connected to the first end of the resistor R2040 and the first end of the capacitor C980, and the second end of the resistor R2040 is connected to the fourth input pin of the second control chip;

[0022] The second pin of the connector CN50 is connected to the first end of the capacitor C970 and the IO device power supply switch, and the first pin of the connector CN50, the second end of the capacitor C970, the second end of the capacitor C980, and the second end of the capacitor C990 are grounded.

[0023] Preferably, in an embodiment of the sewing machine control circuit provided by the present utility model, the panel circuit expansion unit includes a connector CN51 for connecting an expansion panel, and an expansion panel power supply switch, a resistor R1991, a resistor R2041, a capacitor C971, a capacitor C981, and a capacitor C991;

[0024] The fourth pin of the connector CN51 is connected to the first end of the resistor R1991 and the first end of the capacitor C991. The second end of the resistor R1991 is connected to the fifth output pin of the second control chip. The third pin of the connector CN51 is connected to the first end of the resistor R2041 and the first end of the capacitor C981. The second end of the resistor R2041 is connected to the fifth input pin of the second control chip;

[0025] The second pin of the connector CN51 is connected to the first end of the capacitor C971 and the power supply switch of the extension panel. The first pin of the connector CN51, the second end of the capacitor C971, the second end of the capacitor C981, and the second end of the capacitor C991 are grounded.

[0026] In addition, the present invention also provides an embodiment of a sewing machine, including the sewing machine control circuit as described above.

[0027] Implementing a sewing machine control circuit and a sewing machine of the present invention has the following beneficial effects: optimizing the data transmission architecture of the panel circuit in the sewing machine, improving the data transmission efficiency while simplifying the circuit structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0029] Figure 1 is a logic block diagram of an embodiment of a sewing machine control circuit of the present invention;

[0030] Figure 2 is a circuit schematic diagram of an embodiment of a sewing machine control circuit of the present invention;

[0031] Figure 3 is a circuit schematic diagram of another embodiment of a sewing machine control circuit of the present invention;

[0032] Figure 4 is a circuit schematic diagram of another embodiment of a sewing machine control circuit of the present invention;

[0033] Figure 5 is a circuit schematic diagram of another embodiment of a sewing machine control circuit of the present invention;

[0034] Figure 6 is a circuit schematic diagram of another embodiment of a sewing machine control circuit of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] In order to have a clearer understanding of the technical features, objectives, and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the drawings.

[0036] As Figure 1 shown, an embodiment of a sewing machine control circuit of the present utility model is shown. In Figure 1 the embodiment of the sewing machine control circuit of the present utility model shown, the sewing machine control circuit of the present utility model includes: a first control chip 110, a second control chip 120, an isolation unit 130, and a panel unit 140; the first control chip 110 is used to output a control level to control the operation of the working motor 210 of the sewing machine; and the first control chip 110 is connected to the second control chip 120 through the isolation unit 130, and is used to receive the first data sent by the second control chip 120, or send the second data to the second control chip 120; the second control chip 120 is connected to the panel unit 140, and is used to send the second data to the panel unit 140, or receive the data generated by the panel unit 140 and generate the first data. Specifically, the first control chip 110 is also the main control chip, which is used to control the operation of the working motor 210 of the sewing machine and execute the specific sewing action of the sewing machine. The second control chip 120 is also the auxiliary control chip, which is used for data communication with the panel unit 140. The first control chip 110 and the second control chip 120 are connected through the isolation unit 130. The first control chip 110 sends data to the second control chip 120 through the isolation unit 130, and the second control chip 120 sends the received data to the panel unit 140. Or the second control chip 120 generates corresponding data according to the data of the panel unit 140, and sends the corresponding data to the first control chip 110 through the isolation unit 130. Through this process, high-speed data transmission can be realized between the second control chip 120 and the panel unit 140, and then the working efficiency of the entire sewing machine can be improved.

[0037] In an embodiment, as Figure 2 shown, the first control chip 110 may include an MCU chip U1 and its corresponding peripheral circuit. The eighth pin, ninth pin, tenth pin, thirty-fifth pin, thirty-sixth pin, and thirty-seventh pin of the MCU chip U1 are connected to the first working motor of the sewing machine; the thirty-eighth pin, thirty-ninth pin, fourth pin, fifty-second pin, fifty-third pin, and fifty-fourth pin of the MCU chip U1 are connected to the second working motor of the sewing machine. That is, the MCU chip U1 outputs two groups of PWM signals to respectively control two different working motors of the sewing machine. As Figure 3 , in an embodiment, the second control chip 120 includes an MCU chip U14 and its peripheral circuit. Data communication is realized between the MCU chip U1 and the MCU chip U14 through an isolation circuit.

[0038] In an embodiment, as Figure 4As shown, isolation unit 130 includes isolation chip U13, as well as resistor R91, resistor R95, resistor R92, and resistor R96. The second pin of isolation chip U13 is connected to the first output pin of second control chip 120 via resistor R91, and the third pin of isolation chip U13 is connected to the first input pin of second control chip 120 via resistor R95. The seventh pin of isolation chip U13 is connected to the first input pin of first control chip 110 via resistor R92, and the sixth pin of isolation chip U13 is connected to the first output pin of first control chip 110 via resistor R96. The first pin and the eighth pin of isolation chip U13 are respectively connected to the power supply, and the fourth pin and the fifth pin of isolation chip U13 are respectively grounded. Specifically, in isolation unit 130, a set of data transmission terminals of isolation chip U13 are connected to a set of data transmission pins of second control chip 120 via resistor R91 and resistor R95, and the other set of data transmission terminals of isolation chip U13 are connected to the data transmission terminal of first control chip 110 via resistor R92 and resistor R96. Isolation chip U13 is used to isolate first control chip 110 and second control chip 120 without affecting the data transmission speed.

[0039] In one embodiment, as Figure 5 shown, panel unit 140 includes connector CN5 for connecting sewing machine panel circuit 220, as well as panel circuit power supply switch 140, resistor R199, resistor R204, capacitor C97, capacitor C98, capacitor C99, and triode Q18. The fourth pin of connector CN5 is connected to the first end of resistor R199 and the first end of capacitor C99. The second end of resistor R199 is connected to the third output pin of second control chip 120. The third pin of connector CN5 is connected to the first end of resistor R204 and the first end of capacitor C98. The second end of resistor R204 is connected to the third input pin of second control chip 120. The second pin of connector CN5 is connected to the first end of capacitor C97 and panel circuit power supply switch 140. The first pin of connector CN5, the second end of capacitor C97, the second end of capacitor C98, and the second end of capacitor C99 are grounded. Specifically, in panel unit 140, sewing machine panel circuit 220 is connected via connector CN5. Among them, panel circuit power supply switch 140 is used to control the power-on process of sewing machine panel circuit 220. The fourth pin and the third pin of connector CN5 are respectively connected to a set of data transmission ports of second control chip 120 via resistor R199 and resistor R204 for data transmission. Among them, capacitor C99 and capacitor C98 are used for data filtering. Capacitor C97 is used for power supply filtering of sewing machine panel circuit 220.

[0040] In one embodiment, as Figure 2As shown, the panel circuit power supply switch 140 includes MOS transistor Q18, resistor R192, resistor R194, and resistor R197. The gate of MOS transistor Q18 is connected to the first ends of resistor R194 and resistor R192. The source of MOS transistor Q18, the second end of resistor R192, and the first end of resistor R197 are connected to a power supply. The drain of MOS transistor Q18 is connected to the second pin of connector CN5 through the second end of resistor R197. The second end of resistor R194 is used to receive a control level. Specifically, in the panel circuit power supply switch 140, MOS transistor Q18 is turned on or off according to the input level at the gate of MOS transistor Q18. When MOS transistor Q18 is turned on, the power supply supplies power to the panel circuit 220 of the sewing machine through the turned-on MOS transistor Q18 and the second pin of connector CN5. The power supply to the panel circuit 220 of the sewing machine can be disconnected by controlling MOS transistor Q18 to turn off.

[0041] In one embodiment, as Figure 5 and Figure 6 shown, the control circuit further includes at least one of a PWM signal output unit, an IO port expansion unit 160, and a panel circuit expansion unit 170. The second control chip 120 is respectively connected to the PWM signal output unit, the IO port expansion unit 160, and the panel circuit expansion unit 170, and is used to send second data to the PWM signal output unit, the IO port expansion unit 160, or the panel circuit expansion unit 170, or receive the data generated by the IO port expansion unit 160 or the panel circuit expansion unit 170 and generate first data. Specifically, in the control circuit, a PWM signal output unit can also be provided to output a PWM signal to control the solenoid valve in the sewing machine. The PWM signal output unit is connected to the second control chip 120 and receives the second data sent by the second control chip 120. An IO port expansion unit 160 can also be provided to be connected to an IO interface device to achieve data communication with the IO interface device. The IO expansion unit is connected to the second control chip 120 and receives the second data sent by the second control chip 120. The second control chip 120 can also generate first data according to the data of the IO expansion unit and send it to the first control chip 110. A panel circuit expansion unit 170 can also be provided to be connected to the expanded panel circuit 220 to achieve data communication with the expanded panel circuit 220. The panel circuit expansion unit 170 is connected to the second control chip 120 and receives the second data sent by the second control chip 120. The second control chip 120 can also generate first data according to the data of the panel circuit expansion unit 170 and send it to the first control chip 110.

[0042] In one embodiment, as Figure 6As shown in the figure, the PWM signal output unit includes at least one PWM signal output subunit. Each PWM signal output subunit includes a valve connector for connecting to a solenoid valve, a Darlington amplifier, and a valve drive switch 151. The input end of the Darlington amplifier is connected to the PWM signal output pin of the second control chip 120. The output end of the Darlington amplifier is connected to the control end of the valve drive switch 151. The first end of the valve drive switch 151 is connected to the first end of the valve connector. The second end of the valve connector is connected to a power supply. The second end of the valve drive switch 151 is grounded. Specifically, in the PWM signal output unit, multiple PWM signal output subunits can be set. Each PWM signal output subunit corresponds to a solenoid valve to implement the control process of the corresponding solenoid valve. Among them, the solenoid valve is connected to the PWW signal sub-output unit through the valve connector. The signal output from the PWM signal output pin of the second control chip 120 is amplified by the Darlington amplifier and then input to the valve drive switch 151 to drive the valve drive switch 151 to act and control the state of the solenoid valve.

[0043] In a specific implementation, all Darlington amplifiers are integrated into the Darlington chip U18, and the valve connectors are integrated into the connector J4. That is, when there are multiple PWM signal output subunits, multiple Darlington amplifiers can be respectively a pair of pins of the Darlington chip U18, and the valve connectors can also be a pair of pins of the connector J4. In addition, the valve drive switch 151 can be composed of a MOS transistor and its corresponding peripheral circuit. Taking a specific valve drive switch 151 as an example, in the valve drive switch 151, the gate of the MOS transistor Q19 is connected to the Darlington chip U18 through the resistor R210 and conducts or turns off according to the output of the Darlington chip U18.

[0044] In an embodiment, as Figure 5As shown, the IO port expansion unit 160 includes a connector CN50 for connecting an external IO device, as well as an IO device power supply switch 161, a resistor R1990, a resistor R2040, a capacitor C970, a capacitor C980, and a capacitor C990; the fourth pin of the connector CN50 is connected to the first end of the resistor R1990 and the first end of the capacitor C990, and the second end of the resistor R1990 is connected to the fourth output pin of the second control chip 120; the third pin of the connector CN50 is connected to the first end of the resistor R2040 and the first end of the capacitor C980, and the second end of the resistor R2040 is connected to the fourth input pin of the second control chip 120; the second pin of the connector CN50 is connected to the first end of the capacitor C970 and the IO device power supply switch 161, and the first pin of the connector CN50, the second end of the capacitor C970, the second end of the capacitor C980, and the second end of the capacitor C990 are grounded. Specifically, in the IO port expansion unit 160, the IO device is connected through the connector CN50. Among them, the IO device power supply switch 161 is used to control the power-on process of the corresponding IO device of the sewing machine. The fourth pin and the third pin of the connector CN50 are respectively connected to a set of data transmission ports of the second control chip 120 through the resistor R1990 and the resistor R2040 for data transmission. Among them, the capacitors C990 and C980 are used for data filtering. The capacitor C970 is used for power supply filtering of the panel circuit 220 of the sewing machine. In the IO device power supply switch 161, the MOS transistor Q180 is turned on or off according to the input level of the gate of the MOS transistor Q180. When the MOS transistor Q180 is turned on, the power supply powers the IO device through the turned-on MOS transistor Q180 and the second pin of the connector CN50. The power supply to the IO device can be disconnected by controlling the MOS transistor Q180 to turn off.

[0045] In one embodiment, as Figure 5As shown in the figure, the panel circuit expansion unit 170 includes a connector CN51 for connecting an expansion panel, as well as an expansion panel power supply switch 171, a resistor R1991, a resistor R2041, a capacitor C971, a capacitor C981, and a capacitor C991. The fourth pin of the connector CN51 is connected to the first end of the resistor R1991 and the first end of the capacitor C991, and the second end of the resistor R1991 is connected to the fifth output pin of the second control chip 120. The third pin of the connector CN51 is connected to the first end of the resistor R2041 and the first end of the capacitor C981, and the second end of the resistor R2041 is connected to the fifth input pin of the second control chip 120. The second pin of the connector CN51 is connected to the first end of the capacitor C971 and the expansion panel power supply switch 171. The first pin of the connector CN51, the second end of the capacitor C971, the second end of the capacitor C981, and the second end of the capacitor C991 are grounded. Specifically, in the panel circuit expansion unit 170, the expansion panel is connected through the connector CN51. Among them, the expansion panel power supply switch 171 is used to control the power-on process of the expansion panel. The fourth pin and the third pin of the connector CN51 are respectively connected to a set of data transmission ports of the second control chip 120 through the resistor R1991 and the resistor R2041 for data transmission. Among them, the capacitors C991 and C981 are used for data filtering. The capacitor C971 is used for power supply filtering of the panel circuit 220 of the sewing machine. In the expansion panel power supply switch 171, the MOS transistor Q181 is turned on or off according to the input level of the gate of the MOS transistor Q181. When the MOS transistor Q181 is turned on, the power supply powers the expansion panel through the turned-on MOS transistor Q181 and the second pin of the connector CN51. The power supply to the expansion panel can be disconnected by controlling the MOS transistor Q181 to turn off.

[0046] An embodiment of a sewing machine provided by the present invention includes the above-mentioned sewing machine control circuit. That is, through the above-mentioned sewing machine control circuit, the data processing speed during the working process of the sewing machine is realized, and the user experience is improved.

[0047] It can be understood that the above embodiments only represent the preferred embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. A sewing machine control circuit, characterized in that, Comprising: A first control chip, a second control chip, an isolation unit, and a panel unit; The first control chip is used to output a control level to control the operation of the working motor of the sewing machine; And the first control chip is connected to the second control chip via the isolation unit, and is used to receive the first data sent by the second control chip, or send the second data to the second control chip; The second control chip is connected to the panel unit, and is used to send the second data to the panel unit, or receive the data generated by the panel unit and generate the first data.

2. The sewing machine control circuit according to claim 1, wherein The isolation unit includes an isolation chip U13, and resistors R91, R95, R92, and R96; The second pin of the isolation chip U13 is connected to the first output pin of the second control chip via the resistor R91, and the third pin of the isolation chip U13 is connected to the first input pin of the second control chip via the resistor R95; The seventh pin of the isolation chip U13 is connected to the first input pin of the first control chip via the resistor R92, and the sixth pin of the isolation chip U13 is connected to the first output pin of the first control chip via the resistor R96; The first pin and the eighth pin of the isolation chip U13 are respectively connected to the power supply, and the fourth pin and the fifth pin of the isolation chip U13 are respectively grounded.

3. The sewing machine control circuit according to claim 1, wherein, The panel unit includes a connector CN5 for connecting the sewing machine panel circuit, and a panel circuit power supply switch, resistors R199, R204, capacitors C97, C98, C99, and a triode Q18; The fourth pin of the connector CN5 is connected to the first end of the resistor R199 and the first end of the capacitor C99, the second end of the resistor R199 is connected to the third output pin of the second control chip, the third pin of the connector CN5 is connected to the first end of the resistor R204 and the first end of the capacitor C98, and the second end of the resistor R204 is connected to the third input pin of the second control chip; The second pin of the connector CN5 is connected to the first end of the capacitor C97 and the panel circuit power supply switch, and the first pin of the connector CN5, the second end of the capacitor C97, the second end of the capacitor C98, and the second end of the capacitor C99 are grounded.

4. The sewing machine control circuit according to claim 3, wherein, The panel circuit power supply switch includes a MOS transistor Q18, resistors R192, R194, and R197; The gate of the MOS transistor Q18 is connected to the first end of the resistor R194 and the first end of the resistor R192, the source of the MOS transistor Q18, the second end of the resistor R192, and the first end of the resistor R197 are connected to a power supply, the drain of the MOS transistor Q18 and the second end of the resistor R197 are connected to the second pin of the connector CN5, and the second end of the resistor R194 is used to receive a control level.

5. The sewing machine control circuit according to claim 1, characterized in that, The control circuit further includes at least one of a PWM signal output unit, an IO port expansion unit, and a panel circuit expansion unit; The second control chip is respectively connected to the PWM signal output unit, the IO port expansion unit, and the panel circuit expansion unit, and is configured to send the second data to the PWM signal output unit, the IO port expansion unit, or the panel circuit expansion unit, or receive the data generated by the IO port expansion unit or the panel circuit expansion unit and generate the first data.

6. The sewing machine control circuit according to claim 5, characterized in that, The PWM signal output unit includes at least one PWM signal output subunit, and each PWM signal output subunit includes a valve connector for connecting to a solenoid valve, a Darlington amplifier, and a valve drive switch; The input end of the Darlington amplifier is connected to the PWM signal output pin of the second control chip, the output end of the Darlington amplifier is connected to the control end of the valve drive switch, the first end of the valve drive switch is connected to the first end of the valve connector, the second end of the valve connector is connected to a power supply, and the second end of the valve drive switch is grounded.

7. The sewing machine control circuit according to claim 6, wherein, All the Darlington amplifiers are integrated in the Darlington chip U18, and the valve connectors are integrated in the connector J4.

8. The sewing machine control circuit according to claim 5, characterized in that, The IO port expansion unit includes a connector CN50 for externally connecting an IO device, an IO device power supply switch, a resistor R1990, a resistor R2040, a capacitor C970, a capacitor C980, and a capacitor C990; The fourth pin of the connector CN50 is connected to the first end of the resistor R1990 and the first end of the capacitor C990, the second end of the resistor R1990 is connected to the fourth output pin of the second control chip, the third pin of the connector CN50 is connected to the first end of the resistor R2040 and the first end of the capacitor C980, and the second end of the resistor R2040 is connected to the fourth input pin of the second control chip; The second pin of the connector CN50 is connected to the first end of the capacitor C970 and the IO device power supply switch, and the first pin of the connector CN50, the second end of the capacitor C970, the second end of the capacitor C980, and the second end of the capacitor C990 are grounded.

9. The sewing machine control circuit according to claim 5, characterized in that, The panel circuit expansion unit includes a connector CN51 for connecting to an expansion panel, an expansion panel power supply switch, a resistor R1991, a resistor R2041, a capacitor C971, a capacitor C981, and a capacitor C991; The fourth pin of the connector CN51 is connected to the first end of the resistor R1991 and the first end of the capacitor C991, the second end of the resistor R1991 is connected to the fifth output pin of the second control chip, the third pin of the connector CN51 is connected to the first end of the resistor R2041 and the first end of the capacitor C981, and the second end of the resistor R2041 is connected to the fifth input pin of the second control chip; The second pin of the connector CN51 is connected to the first end of the capacitor C971 and the expansion panel power supply switch, and the first pin of the connector CN51, the second end of the capacitor C971, the second end of the capacitor C981, and the second end of the capacitor C991 are grounded.

10. A sewing machine, characterized in that, It includes a sewing machine control circuit as described in any one of claims 1 to 9.

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