TWI279973B - PWM motor drive circuit - Google Patents

Abstract

A PWM motor drive circuit includes a drive IC member, a Hall IC member, a PWM converter circuit and a capacitor. The drive IC member is electrically connected with the Hall IC member, the drive IC member further includes a pin electrically connected with the PWM converter circuit. The capacitor is connected in parallel between the pin of the drive IC member and the PWM converter circuit, and further connected with a power source. When the motor is started, the capacitor can prevent occurring 0V at the pin of the drive IC member so that the drive IC member cannot unexpectedly enter a high-speed mode.

Description

1279973 IX. The invention relates to a PWM motor driving circuit, in particular to a capacitor connected in parallel between a driving 1C component and a PWM conversion circuit. When the motor is started, the capacitor can be Preventing the motor from entering the PWM motor drive circuit in the high speed mode upon activation. [Prior Art]

Please refer to the first circle, the conventional PWM [Pulse Width

Modulation pulse width modulation] The motor has a PWM motor drive circuit 1 connected to a motor coil 2 for controlling the motor coil 2 to perform alternating excitation so that a motor rotor can be driven to rotate. The PWM motor circuit 1 includes a driving 1C element 10, a Hall IC element u, and a PWM conversion circuit 12. The drive 1C component 1 is electrically connected to the Huo

The 1C component 11 is configured to receive the Hall 1 (the rotor debt signal of the component 11). The driver 1C component 10 has a pin 7 which is also electrically coupled to the PWM conversion circuit 12. The PWM The conversion circuit 12 has a PWM input terminal 121 connected to the input signal, so that the PWM signal is converted into a voltage signal by the PWM conversion circuit 12, and then the voltage signal is input to the driving 1C component. Pin venge, in order to determine the period of alternating excitation of the motor coil 2, so as to control the speed of the motor rotor. Because the motor operating state includes high speed state, low speed [below full speed] operating state and stop [zero speed] state Therefore, the driving Ic component 1 can determine the operating state of the motor according to the input PWM signal, so that the horse 5 - C:\Lindtt\PK Pttt\PK99〇a doc 〇5/ηί)/2Π/0»:58 λΜ 1279973

Dac can adjust the speed according to the system requirements. For example, when the potential of the pin Vth of the driving IC element 1 is higher than 3.6V, the driving 1C element 10 controls the motor to a stop state, that is, the rotation speed is 〇RpM; when the potential of the pin Vth is lower than 2· At 0 ν, the purge 1C component 10 controls the motor to a high j operation state, that is, a rotation speed of 6 〇〇〇 RPM; when the potential of the pin vth is between 3.6 V and 2.0 V, the drive IC component 1 〇 The motor is controlled at low speeds, ie the speed is greater than 0 RPM but less than 6000 RPM. Referring to FIG. 1 again, in the circuit configuration, a capacitor 3 is connected in parallel between the driving IC=10 and the PWM conversion circuit 12, and the electrician 3 is grounded, and is used for the PWM conversion circuit. The 12-input sawtooth wave is filtered so that the drive can be stabilized at a 1:1 potential. When the motor is in operation, the potential of the pin th driving the 1C element 10 determines the rotational speed of the motor. The pin Vth of the 1C element 10 is shown in Figs. 2A and 2B, and the motor drives the Ic element 1 〇 the motor is a high speed mode or a low speed mode, SPeed m〇de. During the normal operation of the motor, when the potential of the pin is maintained at 3·〇ν [the potential is lower than 3·6ν, but the rotation speed higher than the one to be conveyed is maintained in the position, that is, the subject 2 = day ^ additionally, when The potential of this pin vth is 〇v [potential is lower than • ^, and 5 hp motor is in high speed mode. However, it is assumed that the capacitor 3 is grounded, as shown in the first and second figures, so that charging is started at the motor start. At this time, the 9th position of #(四)ICi is zero and zero potential. As shown in Figure 2A, the motor is at C:\Limia\PK Pat\PK9900.tloc η5/Ό!)/ζα/ 〇3.58 λν| 6 — 1279973 = speed mode, that is, the motor-starting speed immediately jumps to 6_匪 [same], as shown in Figure 2B.

According to the first and second _ _ shows that when the motor is started, the shirt and the vibration also generate a large number of components, thereby increasing the disadvantage of the loss of the motor component. As shown in the U 2A and 2B graphs, after the capacitor 3 is charged, the potential of the capacitor 3 gradually reaches 3V. At this time, the potential of the pin driving the busy component ι〇 is higher than 2 shoulders, but lower than 3.6v, so the motor will terminate (4), and the speed of the motor can be rotated at a speed of 2000 RPM 〇' lv f, because the motor is not in the high temperature state at the same time of starting, the driving IC component 1〇 raises the motor speed to (6)(8) RPM (secret state) is not in accordance with the requirements of normal operation, and has improperly consuming energy. Disadvantages. Therefore, it is necessary to use the PWM motor to improve the step by step to avoid entering the high speed state as soon as the motor is started. In view of the above, in order to improve the above disadvantages, the present invention is connected in parallel between the - driving ic element and the -PWM circuit, the capacitor is connected to a voltage source, and when the motor is started, it avoids the pin of the driving Ic element. Vth produces a zero potential to prevent the motor from entering the high speed mode as soon as it is started. SUMMARY OF THE INVENTION The main object of the present invention is to provide a PWM j driver circuit in which a capacitor is connected in parallel between a driving 1C component and a PWM conversion circuit. 7 - C:\Linde\PK PHt\PK99〇adoc 05/ 00/29/09:58 ΛΜ 1279973 Two-start: rtr voltage source, so that the invention has the effect of avoiding the motor Pm speed increasing speed and generating large vibration noise.

= another invention - the purpose is to provide a PWM motor drive circuit, a backup-drive IC S and a PWM conversion circuit in parallel with a capacitor thief 'the capacitor H is connected to a voltage source, so that the present invention has a motor avoidance The effect of accidentally entering the high-speed operation state at startup. The driving 1C component is electrically connected to the Hall IC component, and the nano IC has a - pin electrically connected to the PWM conversion circuit. The capacitor is connected in parallel between the pin of the driver IC component and the PWM conversion circuit, and the capacitor is further connected to a -voltage source. When the motor is started, the capacitor prevents the motor drive circuit in accordance with the present invention: it includes a drive redundancy component, a Hall 1C component, a PWM conversion circuit, and a capacitor. The pin driving the 1C component generates a zero potential to prevent the motor from entering the high speed mode as soon as it is started. [Embodiment] The above and other objects, features and advantages of the present invention will become more apparent and understood. b, as shown in FIG. 3, the PWM motor driving circuit 1 of the preferred embodiment of the present invention is electrically connected to a motor coil 2, which may be selected from a single-phase coil, a two-phase coil or a three-phase coil. . The PWM motor drive circuit 1 includes a drive 1C component 1A, a Hall 1C component 11A PWM conversion circuit 12, and at least one *container 3, > The motor drive circuit 1 is used to drive the motor coil 2 to be turned on so that the motor coil 2 can be C:\Linda\PK Prtt\PK9900. doc —8 — 05/09/20/09:58 ΛΜ 1279973 Alternating magnetic field. Referring to FIG. 3 again, the driver IC component 1() is electrically connected to the Hall 1C component 11, and the driver IC component 10 is electrically connected to the PWM conversion circuit 12. The driving IC component 1 has a first chat 1 〇 1 and a second pin 102. The first pin 1〇1[VTH] is electrically connected to the PWM conversion circuit 12 for inputting a pWM signal, and the second pin 102 is configured to provide a predetermined voltage to the pWM conversion circuit 12 and the capacitor 3'. . 1 Referring to FIG. 3, 仏 and 犯, when the motor is initially started, the first pin 1〇1 of the driving 1C device 10 can be connected to the second pin 102 by the capacitor to form a A predetermined voltage, such as a 6V voltage. _ The drive element can control the speed of the motor as required. During the normal-to-normal operation of the motor, when the potential of the first pin 101 is maintained at 3 〇 v [potential lower than 3.6 V but higher than 2.0 V], the rotational speed of the motor is maintained at _ RPM, that is, the motor Enter the low speed mode. In addition, when the potential of the first bow is 0V [potential is lower than 2.0V], the motor is in the high-gear mode, as shown in Figures 2A and 2B; ^—工—«久κ纸The potential of the first pin 101 of the 1C component 10 is 6V; then the potential of the first pin 101 is lowered to 3V, as shown in FIG. 4A, when the motor is started, its rotational speed is zero; then, The motor is gradually increased from zero speed to 2000 RPM or a predetermined speed, as shown. In short, when the motor is started, the drive 1 (the component 1 〇 ^ an acceleration buffer period, so that the motor can be increased to a predetermined speed.: C:\Lind«\Plt P«t\PK990ft doc — 9 05/η〇/2η/0!1:58 , \Μ 1279973 Please refer to FIG. 3 again, the Hall IC element U is used to provide a rotor detection signal to the driving 1C component 10, so that the driving IC The component appropriately turns on the motor coil 1, so that the motor coil 2 can drive the rotor to rotate. Referring to FIG. 3 again, the ??]\1 conversion circuit 12 has a PWM input terminal 121, which is connected to input a pwm. a signal, such that the pwM signal is converted into a voltage signal by the PWM conversion circuit 12, and then the pen pressure is input to the first pin ιοί of the driving 1C component 1 to determine the alternating excitation of the motor coil 2 The cycle is such that the rotational speed of the motor rotor can be controlled.

Referring to FIG. 3, the capacitor 3 of the preferred embodiment of the present invention is connected in parallel between the first pin (7) of the driving 1C component and the switching circuit 12, which can also be used. The selection consists of several capacitor units connected in parallel or in series. At the same time, the capacitor 3 is connected between the first pin 101 and the second pin 1〇2 of the driving IC device 1〇; or the capacitor 3 may be directly connected to a voltage source. Since the second pin 102 k of the redundant component 1 is supplied with a voltage of 6 V ', the capacitor is stopped when the motor is stopped.

The potential of the 3' is up to 6V. Please refer to the 4A and 4B diagrams. Once the motor is started, the potential of the 3' of the valley state is gradually reduced from 6V to 3V. In contrast, the motor is at zero speed. The rotation speed [彳7 stop state] is started, and after the acceleration buffer period, finally increased to 2〇0〇RPM or a predetermined rotation speed. '== Referring again to FIG. 3, the capacitor valley of the preferred embodiment of the present invention The value can be adjusted according to the product requirements, so that the speed of the driver can be adjusted after the acceleration buffer period of the driver C:\Linda\PK I»at\PK99〇a <loc 1279973 ίο Fangda==2 This motor passes the acceleration speed phenomenon. Pre-reading speed to avoid improperly adding the door compared to the conventional driving IC component 10 and the _switching circuit 12 to sub-connect the electric b 3 , and the electric Μ 3 shaped land, as shown in the figure Mode ie - start motor speed jumps immediately to

: as shown in Figure 2B. In contrast, the capacitor 3 is connected in parallel between the driving redundancy 7L device 10 and the PWM conversion circuit 12 in the preferred embodiment of the present invention, and the capacitor m is connected to the first pin and the second pin of the driving IC device 1 Between 102, so, when the motor starts, the mmm is 6V's motor is in the low speed mode, and after the speed buffer period, it gradually accelerates, that is, the motor speed gradually climbs from zero to 2〇〇〇RpM or a predetermined The speed is as shown in Figure 4B. The driving jC element 1 of the preferred embodiment of the present invention can control the motor speed to gradually accelerate after the speed buffer period. When the motor is started, its operating temperature has not reached a high temperature state, so the driving IC component 1 can gradually increase the motor speed from zero to 2000 RPM or a predetermined rotational speed to meet the requirements of normal operation and avoid improper energy consumption. And the disadvantages of loud noise at startup. While the present invention has been described in detail with reference to the preferred embodiments of the present invention, it is not intended to limit the scope of the invention. The scope of protection of the invention is subject to the scope of the patent application, whichever is defined. C:\Lindii\PK PBt\PK9900. doc —11 — 1279973 [Simple description of the diagram] Fig. 1 is a schematic diagram of the circuit of the conventional PWM motor drive circuit. : Fig. 2A · Schematic diagram of the potential generated by the pwM motor drive circuit at the drive element _. Figure 2B: Schematic diagram of the drive redundancy component of the motor drive circuit and the rotational speed of the wheel. Fig. 3 is a schematic view showing the electric circuit of the PWM motor drive circuit in accordance with a preferred embodiment of the present invention. Fig. 4A is a schematic view showing the potential of the pWM motor drive circuit for driving the pin of the 1C element in the preferred embodiment of the present invention. _, FIG. 4B is a schematic diagram showing the output rotational speed of the driving 1C component of the PWM motor driving circuit of the preferred embodiment of the present invention. [Main component symbol description] 10 Drive 1C component 102 pin 12 PWM conversion circuit 3' capacitor

1 PWM motor drive circuit 101 pin 11 Hall 1C component 121 PWM input 2 Motor coil 3 Capacitor C:\Linda\PK 咖我咖 n.doc —12 —

05/09/29/09:58 AM

Claims (1)

1279973 :3⁄4疋替捷|v X. Patent application scope: 1. A PWM motor drive circuit, comprising: Γ driving a 1C component electrically connected to a motor coil, the drive Ic reading can control the rotation speed of the motor, the crane The IC component has a second pin of the foot; a music-switching PWM conversion circuit electrically connected to the driving busy component, and at least one capacitor, one end of which is connected in parallel with the first and second legs of the driving ic component and PWM conversion Between the circuits, the capacitor is -= to the first pin of the driver IC S--and one of the voltage sources; wherein when the motor is started, the capacitor has a predetermined potential to drive the 1C component to prevent the motor from immediately entering the high In the speed mode, the life = and LfKtl to 1C component makes the motor speed gradually change from zero to a predetermined speed. 2, according to the application of the scope of the second paragraph of the PWM motor drive 1 where the capacitor H is selected to record a capacitor unit in parallel ', 3, according to the patent range of the first paragraph of the PWM motor drive =. Wherein the capacitor n can form the crane IC element-(four)^ road, so that after the motor passes the acceleration buffer period, the predetermined rotational speed is 1 J '. /, the fan can reach 4, = the patent range of the fourth part of the PWM one of the capacitor value of the capacitor can be based on the product f to find the circuit, adjust the acceleration of the drive component of the acceleration buffer period ^ ' so c: \ Linda\PK Pet\f>K99〇〇.doc 〇6/J 0/20/02; 〇4 ρ,, —13 —