TW517440B - Voltage-control type drive circuit used for magnetic-inductance load and sewing machine used therefor - Google Patents

Abstract

In the stand-by mode, which is contrary to the drive-mode, a reference voltage of the current limiting portion 46 is varied so that power current Is as an output of the current limiting portion 46 is smaller than load current Ii of the magnetic-inductance load (thread-swing motor 30).

Description

517440

[Technical Field] The present invention relates to an electric motor control type magnetic induction load driving problem and a slit provided with the circuit, which can output the power source = source current 'and use a pseudo power source. Charge and discharge for those who have a magnetic induction load of 4. [Know-how] As shown in FIG. 1, it has a spindle motor that rotates the spindle 14 by rotating the spindle 12 provided in the head 10 of the sewing machine to make the needle 14 move up and down. A sewing machine with a needle pendulum motor 30 that moves in the left-right direction and consists of a pulse motor. In the figure, the number 16 refers to a pulley that manually rotates the main shaft 12 to move the needle. '@ 18 is used to perform various settings. The main shaft stirrup 20 is provided with a detectable rotation. ^ &Amp; Near the aforementioned pulley 16 is provided to detect the bur from this rotational position "above: position up and down position sensor 24, and is positioned near the aforementioned pendulum motor 30-to detect the origin of the bur movement The origin sensor of the point position ^. The control device of the spindle motor 20 and the pendulum motor 30 described above has the following mechanisms, such as: The structure is constructed by borrowing the operating position of a pedal (not shown) to generate a signal. The spindle control circuit 26 that controls the rotation of the spindle 12 in response to the output of the aforementioned control panel M, the aforementioned encoder 22, and the aforementioned up and down position sensor 24 can be driven by the output of the spindle control circuit% The spindle motor driving circuit M of the foregoing spindle motor 2G can respond to the aforementioned control panel 18, the aforementioned encoder 22, and the aforementioned up and down position sensing. The paper size is suitable for the country (&) A4 specification (χTear public hair)

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I 2517440 A7

V. Description of the Invention (,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,-,,,,,,,,,, and, the needle movement control circuit 34, Output 2 drives the pendulum motor driving circuit% of the aforementioned pendulum motor 30. The aforementioned pendulum motor driving circuit 36 is a voltage-controlled magnetic induction load driving circuit as shown in FIG. 3 so far. This circuit is connected via the power supply circuit 4 〇, current limiter 46, pseudo power supply 62 and current control unit 7q. Power supply unit 40, has a DC power supply 42 and the output capacitor 44. ☆. Current limiter 46, including: switching element 48 The power supply current detector 50, which can be used to intermittently and continuously operate the aforementioned power supply output smoothed by the aforementioned electric order theft 44, such as a frequency of 20kHZ; the power supply current detector 50 is used to detect the power supply U, and the reference voltage generator 52 is used to generate a reference Voltage M, the US standard voltage can correspond to the highest value without damaging the switching element 48 and the lowest value required for the pendulum motor 30 (magnetic induction load) constituted by the pulse motor 2; the comparator 54 is Used for the aforementioned power supply When u is greater than a value that can correspond to the aforementioned reference voltage Vrl, an output is generated; and, the switching control section% is used to turn off the switching element 48 at a predetermined frequency when the comparator 54 generates an output. The aforementioned switching control section 56 There is an internal oscillation circuit, and the pseudo power source 62 is composed of a charging and discharging coil 64 and a capacitor 66. The diode 58 and 60 are used to charge and discharge the power supply current Is output from the current limiting unit Jun. The current n is supplied to the needle pendulum motor 30. The current control unit 70 has a load current detector 72 for detecting the aforementioned load current, and a reference voltage switch 74 for ch / cl. 297 public love dress -------- order --------- line (please read the precautions on the back before filling out this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 517440 Wisdom of the Ministry of Economic Affairs Printed by A7 of Consumer Property Cooperative of the Property Bureau V. Description of invention (switching signal to switch the aforementioned load current n, and the ch / cl switching signal refers to the standby state for switching the needle pendulum state (called CH) and stopping the needle pendulum (Referred to as CL), and the comparator 76 is used to compare the reference voltage Vr2h (when CH) or Vr21 (when CL) of the output of the load current detection 1§ 72 and the output of the reference voltage switch 74. A feedback output is generated to open and close the switching element 48. The current control unit 70 can detect a load current η flowing from the pseudo power source 62 and flows in the pendulum motor 30, thereby controlling the current limiting unit. The switching element 48 of 46 performs feedback control. In the circuit in FIG. 3, when the load current detection portion 72 of the current control portion 70 detects a decrease in load current, a comparator outputs a transmissible output to the switch control portion 56. In the feedback signal of the current shortage state, the switching element 48 of the current limiting portion 46 becomes open at a timing synchronized with the aforementioned predetermined frequency, so that the power supply current Is starts to flow. By this power supply current Is, energy is stored in the coil 64, and the load current? Also increases. When the load current Ii becomes the control current value set by the reference voltage switcher 74, the switching element 48 is turned off at the timing synchronized with the aforementioned predetermined frequency by the output of the comparator, and the power supply current Is no longer flows. At this time, the energy of the coil 64 is charged to the capacitor 66. Then, the load current η is reduced again, and stored in the coil 64 again, and then charged to the capacitor 66. In this way, as shown in FIG. 4, the power supply current Is generates a pulse such as 20 kHz, and a frequency ripple corresponding to the pulse is generated in the load current Ii. By using such a voltage-controlled magnetic induction load drive circuit, compared with a current detection type magnetic induction load drive circuit without a pseudo power supply 62, it can reach: · ^ --------- line (please read the back first (Notes for filling in this page)

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Printed by the staff of the Intellectual Property Bureau of the Ministry of Economic Affairs, f. [Problem of the invention] However, the circuit constants of the conventional coil 64 or capacitor 66 are adjusted in accordance with the use state (CH state) of the rotation of the pendulum motor 30. In this CH state, as shown in FIG. 4, the power supply The current and load current have a predetermined frequency (such as 20kHz), which does not cause problems, but in the standby state (CL state) after the stop of the pendulum motor 30, the equilibrium state of control will collapse, the charging of capacitor 66 will increase, and the load The current Π is larger than the control current value at CL by the supply voltage of the capacitor 66, which causes the switching element 48 to continue periodically and intermittently. That is, when the load current Ii decreases, a comparator 76 outputs a feedback signal that can show that the current Ii is insufficient as shown in FIG. 5. The switching element 48 is turned on and off in synchronization with a predetermined frequency (such as 20 kHz). It takes time for the capacitor 66 to charge, and the comparator 76 cannot detect the increased current immediately, and continuously outputs a feedback # sign indicating that the current Η is insufficient. When the output of the feedback signal is interrupted at timing t1, the capacitor 66 becomes an overcurrent with respect to the load current η in the standby state, and shortly thereafter, a feedback signal indicating that the current Ii is inadequate cannot be output, so that the switching element 48 is present. Closed and continuous action. In addition, at this time, the power supply current Is is also small, and the comparator 54 of the current control unit 46 cannot output a signal generated when the power supply current Is exceeds a current that can correspond to the aforementioned reference voltage vrl. Therefore, a problem occurs, that is, the power supply current Is is switched intermittently as shown in FIG. 5 through the collapse of the control balance, and the load current Ii is set to II · I ------- order ---- --I-- (Please read the notes on the back before filling this page) -7- 317440

V. Description of the invention (A member of the Intellectual Property Bureau of the Ministry of Economic Affairs, X Consumer Cooperative printed an audible frequency such as 800 ~ 1kHZ, which caused a buzzing sound (noise) when the sewing machine stopped running. This invention is used to solve The first problem is the one who can prevent the noise in the audible range caused by the magnetic induction load in the standby state. The second problem of the present invention is to prevent the sewing machine from stopping when the sewing machine is stopped. [Solution] The present invention is to provide a voltage-controlled magnetic induction load driving circuit to solve the above-mentioned problem! That is, it includes a current limiting mechanism for intermittently continuous power output at a predetermined frequency. Those who limit the power supply current and then output it; pseudo power supply is used to charge and discharge the power supply current from the current limiter device for the magnetic induction load; and current control mechanism is used to detect the A load current flowing on the magnetic induction load by a pseudo power source to control the switching element of the current limiting device; and There is also a device for switching the power supply current from the current limiting device, and when the magnetic induction is in a standby state, the power supply current is smaller than the negative current in a state opposite to the driving state of the magnetic induction load. What's more, the present invention provides a sewing machine to solve the above-mentioned second problem, that is, "the sewing machine is provided with the voltage-controlled magnetic induction load driving circuit as described above," and the standby state of the magnetic induction load when the sewing machine is stopped. In the state opposite to the driving state of the magnetic induction load, the aforementioned power supply current is smaller than the aforementioned load current. This paper size applies the Chinese National Standard (CNS) A4 specification (21Q x 297 public hair 1 clothing ------ --tr --------- (Please read the notes on the back before filling this page)

517440 V. Description of the invention (6) [Embodiments of the present invention] The following describes the embodiments of the present invention in detail with reference to the drawings. In this embodiment, in the same voltage control type magnetic induction load driving circuit as the conventional example shown in FIG. 3, as shown in FIG. 6, an AND gate 80 and a reference voltage switch 82 are provided. And brake 80 is a logical product that can output the CH / CL switching signal and the sewing machine stop signal generated by the output of the aforementioned encoder 22; and the reference voltage switch 82 is based on the output of the brake 80 The reference voltage of the comparator 54 input to the current limiter 46 is switched to the reference voltage Vr3 of the comparator 54 input to the current limiter 46 when the sewing machine is stopped and is in CL The voltage of the reference voltage Vr2l of the load current control unit 70 at the time of CL is still low. The operation of this embodiment will be described below. First, when the pendulum motor 30 is in the driving state and the CH signal is output, or when the sewing machine has not stopped, the comparator 54 of the current limiter 46 is set to a ratio input to the current control section 7 as in the conventional case. The reference voltage Vr2h or Vr21 of the comparator 76 is high. Therefore, as shown in Fig. 4, the load current? Operates at a frequency as high as the power supply current Is, and no noise is heard. On the other hand, when the pendulum motor 30 is in the c L state when it stops operating, and when the sewing machine that feels noisy is stopped, the reference value switch 82 is set to a comparator 54 in the current limiter 46 which is set to be much larger than the load input The reference voltage Vr21 (at CL) of the comparator 76 of the current control unit 70 is still a small value Vr3 °. Therefore, the comparator 76 continues to output to the switch control unit 56 to convert the paper size of the paper to the Chinese National Standard (CNS) A4 specification.丨 ilFx 297 public love) — I — -IIIII ϋ IIII — — — — — — — I— ^ OJ · ϋ II ϋ IIII (Please read the notes on the back before filling this page) 9-9 517440

The consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs prints the feedback signal of insufficient current state. Without controlling the opening and closing of the switching element 48 based on the output of the comparator 76 of the current control unit, the switching element 48 only borrows Controlled by the power supply current Is detected by the power supply current detector 50. Then, when the load current n corresponding to the standby state is reduced, the comparison voltage Vr3 with the detection current measured by the power supply current detector 50 is reduced, and when the switching element 48 is turned on at the aforementioned predetermined frequency, within the period It is set to the off state so that the power supply current Is always tends to be insufficient. Therefore, the capacitor 66 will not be overcharged, and the detection current of the capacitor is difficult to delay, and the switching operation of 20kHz is always performed without intermittent operation. Switch action. According to this embodiment, not only the CL signal for setting the pendulum motor 30 to the standby state, but also the reference voltage of the current limiter 46 can be switched in response to the sewing machine stop operation signal output by the encoder 22, so it can be sold off. The noise when the rusty sewing machine stops running. In addition, the reference voltage can always be reduced to Vr3 at CL regardless of the stop signal. In addition, the applicable object of the present invention is not limited to the drive circuit of the needle pendulum motor of the sewing machine, and it is of course that it can also be applied to push-pull solenoids or linear drive motors, such as sewing machines and general drive machinery outside the sewing machine. drive. [Effects of the Invention] According to the present invention, the fluctuation of the load current in the standby state can be excluded from the audible frequency range, and noise can be eliminated. [Brief description of the drawings] Fig. 1 shows the main parts of a sewing machine, which is an example of the applicable object of the present invention. The paper size is Gu Xiaoguo ^ Τ ^ Γϋ ^ Γ〇 · χ 297 Public Love 7 T 丨 — '----- --- Order --------- line (Please read the precautions on the back before filling this page)

-10 · 517440 A7 B7 V. Front view of the mechanical structure of the invention description (Q) 〇. Fig. 2 is a block diagram showing a configuration example of the same control device. Fig. 3 is a circuit diagram showing an example of a conventional voltage-controlled magnetic induction load driving circuit for driving a same pendulum motor. Figure 4 is a line diagram showing an example of the relationship between the power supply current Is and the load current η used to drive the same needle pendulum motor in the CH state. FIG. 5 is a line chart showing an example of the relationship between the power current is and the load current π for driving the same needle pendulum motor into the CL state. Fig. 6 is a circuit diagram showing a voltage-controlled magnetic induction load driving circuit used in the embodiment of the present invention. Fig. 7 is a line diagram showing an example of the relationship between the power supply current is and the load current in the CL state when the sewing machine is stopped in the aforementioned embodiment. [Explanation of the component numbers in the figure] -------------- Installation --- f fist first read the general Italian matters on the back before filling in this page) Order ·

• Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 10… Sewing machine head 11… Sewing machine rotation command board 12… Spindle 14… Needle 16… Pulley 18… Only control panel 20 ...... Spindle motor 22… encoder. 24… up and down position sensor 26… spindle control circuit 28… spindle motor drive circuit This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)-line · -11- 517440 A7 B7 V. Description of the invention (n) y Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 30 ... Needle pendulum motor 32 ... Origin sensor 34 ... Needle movement control circuit 36 ... Needle pendulum motor drive circuit 40 ... Power supply section 42 ... DC power supply 44 ... Capacitor 46 ... Current limiting section 48 ... Switching element 50 ... Power supply current detector 52 ... Reference voltage generator 54 ... Comparison 56 ... switch control unit 58 ^ 60 ... diode 62 ... pseudo power supply 64 ... coil 66 ... capacitor 70 ... current control unit 72 ... load current detector 74. ..Reference voltage switch 76 ... comparator (please read the precautions on the back before filling this page) ^ ---- order --------- line

This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) • 12-

Claims (1)

517440 §__ VI. Patent application scope 1. A voltage-controlled magnetic induction load drive circuit, which includes: a current limiting mechanism, which is used to continuously and continuously output power at a predetermined frequency to limit the power supply current and then output it; The power supply is used to charge and discharge the power supply current from the current limiting device for the magnetic induction load; and the current control mechanism is used to detect the load current flowing on the magnetic induction load by the pseudo power supply, To control the switching element of the current limiting device; and a device for switching the power supply current from the current limiting device is provided therein; and in the standby state of the magnetic induction load, in a state opposite to the driving state of the magnetic induction load Next, the power supply current is made smaller than the load current. 2. A sewing machine having a voltage-controlled magnetic induction driving circuit for the first item of the patent application scope; and when the standby state of the magnetic induction load when the sewing machine is stopped, the driving state is opposite to that of the magnetic induction load The state where the aforementioned power supply current is less than the aforementioned load current. 0 Printed by the Consumer Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs