KR100320404B1 - A control circuit of BLDC Motor to unified the DC power supplying circuit with the motor driving circuit - Google Patents

Abstract

The present invention relates to a control circuit of a BLDC motor integrating a DC power supply circuit and a motor driving circuit, and to an AC commercial power supply without applying DC power to a BLDC motor using an external DC power supply. The DC power supply circuit is integrally formed with the motor driving circuit so as to be driven by the DC power supply circuit so that the motor can be controlled without a separate external DC power supply and the control circuit of the BLDC motor with the motor driving circuit is integrated. will be.

Description

A control circuit of a DC motor that integrates a DC power supply circuit and a motor driving circuit {A control circuit of XLC Motor to unified the DC power supplying circuit with the motor driving circuit}

The present invention relates to a control circuit of a BLDC motor integrating a DC power supply circuit and a motor driving circuit, and to an AC commercial power supply without applying DC power to a BLDC motor using an external DC power supply. The DC power supply circuit is integrally formed with the motor driving circuit so as to be driven by the DC power supply circuit so that the motor can be controlled without a separate external DC power supply and the control circuit of the BLDC motor with the motor driving circuit is integrated. will be.

In the conventional case, a BLDC motor with a low energy loss rate is used instead of a shading coil type AC motor having an energy loss rate of about 80% of the input value as a motor used in a place where energy loss is minimized, such as a refrigerator cold circulation motor. Have been.

However, in order to supply DC power to the BLDC motor, it was necessary to use an external DC power supply installed separately from the outside of the motor. Therefore, it was difficult to secure a space for accommodating it in modern electronic products that are becoming smaller and lighter. Since the power supply had to be manufactured separately, there has been a problem of an increase in work process and cost.

1 illustrates a control circuit of a conventional BLDC motor that is typically used, and includes an external DC power supply 1 and a motor driving circuit 2 for driving a motor.

Looking at the detailed configuration of the motor driving circuit (2), the magnetic pole detection sensor (Hall IC) 22 for detecting the movement of the magnet 21 of the motor rotor 20 to generate a square wave voltage, and the magnetic pole detection Pull-up resistors R1 and R2 connected to both the input and output sides of the sensor 22 and the signal generated from the output side of the stimulus detection sensor 22 are applied to the base when a predetermined voltage flows over the base. A switch Q1 consisting of a pair of transistors for conducting between the emitter and the emitter, a zener diode ZD1 for preventing counter voltage during switching of the switch Q1, and a collector-side signal of the switch Q1, when the collector voltage flows above a predetermined voltage. A switch Q2 that conducts between the emitter and the emitter and outputs a collector-side waveform of the switch Q1 and a waveform having a phase of 180 °, a zener diode ZD2 for preventing a counter voltage during switching of the switch Q2, and the switch The capacitors C1 and C2 connected in parallel between the collectors and emitters of the Qs Q1 and Q2 and serve as an auxiliary power source to increase the rotational torque when the rotor 20 rotates, and the switches Q1 and Q2 respectively. When the magnet 21 of the rotor 20 is rotated 180 ° when connected to the collector side, the electrode of the stator magnet (not shown in the drawing) is changed to rotate by the inertia force of the magnet 21 and the suction and repulsion force of the magnet 21. It consists of coils L1 and L2 which allow the rotor 20 to rotate continuously in the same direction.

In FIG. 1, reference numeral D1 denotes a constant voltage diode.

Looking at the operation of the control circuit of the conventional BLDC motor having the configuration as described above, when the current flows in the coils L1, L2, the magnet 21 is rotated, the magnetic pole sensor 22 is the magnet of the rotor ( 21) detects the movement of the square to generate a square wave voltage.

At this time, the magnetic pole sensor 22, the output is changed by the rotation of the magnet 21, when the magnet is rotated 180 ° to switch by switching the output waveform of the switch Q1 and Q2 magnetization of the stator (not shown) By changing the electrode, the rotational inertia force of the magnet 21 and the suction and repulsion force of the magnet 21 cause the magnet 21 to rotate continuously in the same direction as it rotates.

However, in the conventional case as described above, the motor driving circuit 2 for driving the motor is housed inside the motor, but the DC power supply 1 according to the DC power supply 1 is to be installed separately from the outside of the motor. Since there is a need for a storage space of the electronics, there have been many limitations on the miniaturization and precision of electronic products, and since the DC power supply 1 must be manufactured separately from the motor, there are various problems such as an increase in the manufacturing process and cost.

The present invention has been made to solve the above problems, the DC power supply circuit to be driven by AC commercial power without applying DC power to a BLDC motor (Blushless DC Motor) using an external DC power supply device It is possible to control the motor without a separate external DC power supply device by constructing the motor driving circuit integrally, and to make the electronics smaller and lighter, as well as the DC power supply circuit which shortens the manufacturing process and lowers the manufacturing cost. It is an object of the present invention to provide a control circuit of a BLDC motor incorporating a motor driving circuit.

1 is a control circuit diagram of a conventional BLDC motor

2 is a control circuit diagram of the present invention;

<Description of symbols for important parts of the drawings>

1: External DC power supply device 2, 200: Motor drive circuit

20, 400: rotor 21, 500: magnet

22, 300: stimulus detection sensor 100: DC power supply circuit

110: rural security government 120: rectification and smoothing department

130: auxiliary power supply unit 140: voltage divider

Hereinafter, with reference to the accompanying drawings will be described in more detail the circuit configuration and operation effect of the control circuit of the present invention.

Figure 2 is a control circuit diagram of the present invention, the circuit configuration of the present invention is connected to the commercial AC power input in parallel to the varistor Z1 to suppress the surge voltage generated instantaneously in the commercial AC power supply, and is connected to one side of the commercial AC power input Film capacitor that suppresses harmonics of AC power input through varistor Z1, improves low power factor by reducing phase difference between AC voltage and AC current, and limits overcurrent flowing through coils L1 and L2 by reducing commercial power input when motor is overloaded The power stabilizer 110 made of C1,

A bridge rectifying diode BD whose input side is connected to an AC power input to rectify the AC input and output to DC, and a smoothing capacitor which is connected to the output side of the bridge rectifying diode BD in parallel to remove ripples of the output DC current. Rectification smoothing unit 120 made of C3,

Rectification is a single-phase half-wave rectifier circuit connected to the varistor Z1 to supply commercial AC power to the rectifying diodes D1 and D2, and connected in parallel to each other in order to rectify and output the AC input from the film capacitor C2. The diodes D1 and D2 and the rectified power output from the rectifying diodes D1 and D2 are applied to the motor driving circuit 200 to supply the stimulus detection sensor 300, the field effect transistors FET1 and FET2, and the signal reflection transistor DT1. An auxiliary power supply unit 130 comprising an auxiliary power supply resistor R1 to be used as a control power source;

A resistance-resistance- zener diode series connection body is connected in parallel to the output side of the bridge rectifier diode BD, and a cathode side is connected to the voltage divider resistor R2, R3 and the voltage divider resistor R3 connected in series from the coils L1 and L2. Zener diode ZD1 for voltage dividing and a smoothing capacitor C4 connected in parallel with the zener diode ZD1 to smooth the divided voltages output by the voltage dividing resistors R2, R3 and zener diode ZD1 to output to the motor drive circuit 200. A DC power supply circuit 100 including a voltage divider 140;

The same voltage is applied to the gate of the field-effect transistor FET1 and the base of the signal-transistor transistor DT1 that sense the magnetic pole (N pole or S pole) of the magnet 500 formed on the motor rotor 400 to generate a square wave output voltage. Stimulus detection sensor 300 for applying a signal,

A protection resistor R6 connected between the output side of the stimulus detection sensor 300 and the gate of the field effect transistor FET1 to protect the output side of the stimulus detection sensor 300 from the gate of the field effect transistor FET1;

A field effect transistor FET1 having a gate side connected to the protective resistor R6 and a drain side connected to a coil L1 and a source side respectively connected to ground, and being turned on when a high (H) signal is applied to the gate to flow a current through the coil L1;

The gate side is connected to the output side of the auxiliary power supply 130 and the drain side of the auxiliary power supply 130 through the collector side pull-up resistor R7 of the transistor for signal transfer described below. A field effect transistor FET2 (OFF) to short-circuit the current in the coil L2,

Electrolytic capacitors C5 and C6 for preventing counter electromotive voltage and protecting FET1 and FET2 during the switching operation of the FET1 and FET2, respectively, and the base side of the output side of the magnetic pole sensor 300 and the collector side of the gate side of the field effect transistor FET2. When the field effect transistor FET1 is turned on and the field effect transistor FET1 is turned on, the collector output waveform is inverted to the low signal. By applying a low (L) signal to the gate of the field effect transistor FET2, it is connected to an input side of the signal-transistor transistor DT1 that controls the field effect transistor FET2 to switch to operate, and is connected to the input side of the stimulus detection sensor 300. Current limiting resistor R4 for limiting the current input from the supply circuit 100, and pull-up resistor R7 described below with the output side of the magnetic pole sensor 300 To the collector-side pull-up resistor R7 of the signal-transistor transistor DT1 connected between the output-side pull-up resistor R5 of the magnetic pole detection sensor 300 and the output side of the DC power supply circuit 100 and the collector side of the signal-transistor transistor DT1 connected thereto. The motor driving circuit 200 is configured.

Referring to the circuit operation of the present invention having the above-described circuit configuration, when commercial AC power is input, AC power is input to the rectifier diode BD through the varistor Z1 and the film capacitor C1.

At this time, varistor Z1 serves to protect the circuit by suppressing the surge voltage generated by commercial AC power momentarily, while film capacitor C1 suppresses harmonics and reduces the phase difference between AC voltage and AC current to improve low power factor. In the event of overloading the motor, the commercial AC power input is turned down to limit the overcurrent.

The AC input input to the bridge rectifier diode BD is rectified and output as DC, and this DC output is smoothed with the ripple removed by the smoothing capacitor C3, and part of it is induced in the coils L1 and L2 to supply power for motor driving. Part of the voltage is generated by the voltage divider R2, R3 and the zener diode ZD1 for voltage dividing, and the voltage divided by the voltage is smoothed with the ripple removed by the smoothing capacitor C4. It will be used as part of the control power supply.

However, since the output current due to this divided voltage is very small, the auxiliary power supply unit 130 adds the auxiliary power to this divided power to become a stable power supply sufficient to control the motor driving circuit 200.

That is, commercial AC power is applied to the film capacitor C2 via varistor Z1, rectified to DC by a parallel connection pair of rectifier diodes D1 and D2, which are single-phase half-wave rectifier circuits, and the auxiliary power is supplied to the motor driving circuit through the resistor R1 for auxiliary power supply. By being added to the furnace 200, the magnetic pole detection sensor 300 of the motor drive circuit 200, the field effect transistors FET1 and FET2, and the signal reflection transistor DT1 are stably controlled.

When power is applied to the motor driving circuit 200, the magnetic pole sensor 300 detects the magnetic pole (N pole or S pole) of the magnet 500 formed on the motor rotor 400 to generate a square wave output voltage to generate an electric field effect. The same output voltage signal is applied to the gate of the transistor FET1 and the base of the transistor DT1 for signal reflection.

When a high (H) signal is applied to the gate of the field effect transistor FET1, the field effect transistor FET1 is turned on to flow a current through the coil L1, and at the same time, the collector output waveform of the transistor DT1 for signal transfer is low (L). Signal is applied to the gate of the field effect transistor FET2, so the field effect transistor FET2 is turned off to short the current of the coil L2.

Accordingly, the coil L1 is excited and generates a rotational force, thereby causing the motor rotor 400 to rotate 180 °.

The motor rotor 400 rotated 180 ° causes the magnetic pole direction detected by the magnetic pole sensor 300 to be reversed to generate an output signal having an opposite phase, thereby turning off the field effect transistor FET1, and causing the field effect transistor to be turned off. The FET2 is turned ON to perform the switching operation.

Therefore, the coil L2 is excited and the rotor 400 rotates 360 °. At this time, the rotor 400 rotates in the same direction as when the exciting current flows through the coil L1 by the rotational inertia force.

Meanwhile, the motor is continuously rotated in the same direction by the repeated ON / OFF operations of the field effect transistor FET1 and the field effect transistor FET2.

The effect obtained by the present invention having the circuit configuration and circuit operation as described above is driven by AC commercial power without applying DC power to a BLDC motor using an external DC power supply. By configuring the DC power supply circuit integrally with the motor driving circuit, it is possible to control the motor without a separate external DC power supply device, which not only reduces the size and weight of electronic products but also shortens the manufacturing process and lowers the manufacturing cost. This has a useful effect.

Claims (1)

Varistor Z1 connected in parallel to the commercial AC power input to suppress the surge voltage generated by the commercial AC power, and AC power connected to one side of the commercial AC power input to suppress the harmonics of the AC power input through the varistor Z1. Power stabilization 110 consisting of film capacitor C1 which reduces the phase difference between voltage and AC current, improves low power factor, and limits overcurrent flowing through coils L1 and L2 by reducing the input of commercial power when the motor is overloaded. A bridge rectifying diode BD whose input side is connected to an AC power input to rectify the AC input and output to DC, and a smoothing capacitor which is connected to the output side of the bridge rectifying diode BD in parallel to remove ripples of the output DC current. Rectification smoothing unit 120 made of C3, Rectifier is a single-phase half-wave rectifier circuit connected to the varistor Z1 to supply commercial AC power to the rectifier diodes D1 and D2, and the AC capacitor from the film capacitor C2 rectified and output in parallel to each other in parallel. The diodes D1 and D2 and the rectified power output from the rectifying diodes D1 and D2 are applied to the motor driving circuit 200 to supply the stimulus detection sensor 300, the field effect transistors FET1 and FET2, and the signal reflection transistor DT1. An auxiliary power supply unit 130 comprising an auxiliary power supply resistor R1 to be used as a control power source; A resistance-resistance- zener diode series connection body is connected in parallel to the output side of the bridge rectifier diode BD, and a cathode side is connected to the voltage divider resistor R2, R3 and the voltage divider resistor R3 connected in series from the coils L1 and L2. Smoothing capacitor C4 connected in parallel with the divided voltage zener diode ZD1 and the zener diode ZD1 and outputting the divided voltages output by the voltage dividing resistors R2, R3 and Zener diode ZD1 to the motor drive circuit 200 for smoothing the voltage. DC power supply circuit 100 consisting of a voltage divider 140 made of; The same voltage is applied to the gate of the field-effect transistor FET1 and the base of the signal-transistor transistor DT1 that sense the magnetic pole (N pole or S pole) of the magnet 500 formed on the motor rotor 400 to generate a square wave output voltage. Stimulus detection sensor 300 for applying a signal, A protection resistor R6 connected between the output side of the stimulus detection sensor 300 and the gate of the field effect transistor FET1 to protect the output side of the stimulus detection sensor 300 from the gate of the field effect transistor FET1; A field effect transistor FET1 having a gate side connected to the protective resistor R6 and a drain side connected to a coil L1 and a source side respectively connected to ground, and being turned on when a high (H) signal is applied to the gate to flow a current through the coil L1; The gate side is connected to the output side of the auxiliary power supply 130 and the drain side of the auxiliary power supply 130 through the collector side pull-up resistor R7 of the transistor for signal transfer described below. A field effect transistor FET2 (OFF) to short-circuit the current in the coil L2, Electrolytic capacitors C5 and C6 for preventing counter electromotive voltage and protecting FET1 and FET2 during switching operation of the FET1 and FET2, respectively, and the base side of the output side of the magnetic pole sensor 300 and the collector side of the gate side of the field effect transistor FET2. When the field effect transistor FET1 is turned on and the field effect transistor FET1 is turned on, the collector output waveform is inverted to the low signal. A transistor DT1 for signal reflection for controlling the field effect transistor FET2 to be switched off by applying a low (L) signal to the gate of the field effect transistor FET2; A current limiting resistor R4 connected to the input side of the magnetic pole detection sensor 300 to limit the current input from the DC power supply circuit 100; An output side pull-up resistor R5 of the stimulus detection sensor 300 connected between the output side of the stimulus detection sensor 300 and the pull-up resistor R7 described below; DC power supply, characterized in that it comprises a motor drive circuit (200) consisting of a pull-up resistor R7 of the collector side of the signal transfer transistor DT1 connected between the output side of the DC power supply circuit (100) and the collector side of the signal transfer transistor DT1. BLDC motor control circuit with integrated circuit and motor drive circuit.