TW201134083A - DC motor with dual power supply method for speed control - Google Patents

Abstract

This invention is a DC motor with dual power supply method for speed control including a low direct current (DC) power supply and a normal maximum input voltage pulse width modulation (PWM) circuit and an appropriate filter. In this method it will be set the DC voltage plus adjustable PWM square wave through the filter.

Description

201134083, invention description: [Technical field] The present invention relates to a speed control method for dual power supply that can effectively control the speed of a DC motor, which can be set with a DC voltage plus an adjustable pulse width modulation PWM square wave and The speed control technology consisting of the filtered dual power supply. [Prior Art] As is known, the general motor control speed or speed adjustment mode can be roughly divided into the following three types: 1. Use a resistor or a transistor to adjust the voltage or current to supply power through the series connection to achieve the purpose of controlling the speed. The disadvantage is that the power use efficiency is the worst, about 50% or less, so the efficiency is low, the energy consumption is large, the output power is small, and the resistance or the temperature of the transistor is easy to rise to a temperature higher than 90 ° C. Therefore, the heat sink must be increased. Obviously, its structure is heavy and bulky. If the transistor is used, it is not easy to saturate the power under the large current load device. When the maximum output is reduced, the voltage drop of the transistor is as large as 3V, and the low voltage device will lose control. 2. Using a pulse width modulation (PWM) circuit and rectifying it to filter the power supply into a DC power supply, which uses a feedback circuit to control the output regardless of buck or boost. The main disadvantage is high material cost and moderate power efficiency. 80%, its main components are M0SFET, inductor, capacitor, temperature rise up to 30 ° C, large current must be added heat sink, medium weight and volume. 3. Only pulse width modulation (PWM) circuits are used, which provide high efficiency square wave output, but the main disadvantage is that they are prone to non-rotation, vibration, abnormal noise or noise. SUMMARY OF THE INVENTION The technology of the present invention mainly utilizes a pulse width modulation (PWM) circuit to transmit $3, 3,340,038 out of a dual-loop power supply, with a _ upper high efficiency temperature rise of only about; two === surgery 2, / output, low noise Wide adjustable range, RPM reading stream (illrUSh CUri"ent), simple circuit, fast response, second/ugly, easy to control, easy to produce, low cost and safe and reliable. [Embodiment]

The invention relates to a speed control method for a dual-power supply of a DC motor, the purpose of which is to use a speed control of a direct-clamping motor, mainly to control the voltage to achieve a control speed. [Reference] - Figure 4 is a block diagram showing the operation principle of the present invention. (DC P^ower) (1) is divided into a normal input voltage DC power supply (丄丄) (hereinafter referred to as the first - voltage source) and - low voltage DC power supply (1 2) [hereinafter referred to as the second (four) source], which is normal The input voltage DC power supply (丄1) is introduced into a pulse width modulation (PWM) circuit (丄3), a pulse width modulation (PWM) circuit (13), and a smoothed circuit (i4) via a suitable inductor, The capacitor is current-limited and filtered, and then supplied to the DC motor (i 5 ). The low-voltage DC power supply (1 2) is also supplied to the DC motor (1 $) at the same time, so as to achieve the DC motor dual power supply. The pulse width modulation (PWM) circuit (13) is connected to a microchip (Micro P) controller or a hard volume circuit (IC) adjustment controller (16) and a feedback circuit with a built-in software program. (1 7), a microchip controller or a hard volume circuit adjustment controller (16) and a feedback circuit (i7) are connected to the DC motor (15), whereby the DC motor (15) can Information such as speed, temperature, voltage, current, power, or positive and negative cycle ratio (Duty) is provided to the feedback circuit (17) and is controlled by the microchip controller or the hard volume adjustment controller (16). Width modulation (pwm) circuit circuit 4 201134083 3) Output: In turn, the speed of the DC motor (15) is effectively controlled. Referring to the first figure, the present invention uses a dust-removing circuit gamma-plane circuit as an example of the operating principle waveform pattern (this circuit is also suitable for working in a step-up circuit) and the second figure. The invention has built-in computer software. The microchip cooperates with the electronic circuit to achieve control or adjust the output. The circuit diagram of the embodiment includes dividing the DC power supply into a normal input voltage DC power supply (1 i ) [the first voltage source] meridian. Wave width modulation (PWM) circuit (1 3 ) presents several output voltage bands (1A), (1 ib), (i ic), (1 1D) and a low voltage DC power supply (1 2) [second voltage source], the voltage is (DCV), and the motor maximum input voltage is (Vin), time is (t), the voltage band (丄丄a), (1 1B), (1]_c), The positive period of (l id) is (d 1 ), and the interval between each voltage band (11A), (11B), (11C), and (11D) 2 is a negative period (D 2), and its frequency (F). As shown in the second figure, the buck circuit (Setd〇wncircuit) is taken as an example to illustrate its operation principle: Motor input maximum voltage (Vin) = PWM output maximum voltage cycle Cycle Dt = Dtl positive cycle + Dt2 negative cycle Frequency Frequency F=l/Dt Positive period ratio (duty ratio) Duty cycle D=Dtl/Dt Output voltage Output voltage Vo

Vo = the first voltage source V source 1 The average output value of the square wave portion of the pulse width modulation circuit and the LC filter effect voltage and the second voltage source v source 2 constitute a composite Voltage. 201134083

If the inductor-capacitor storage effect voltage is not included in the calculation, If let IX Filter effect voltage=0V

Vo = pulse width modulation square wave partial voltage average PWM (V Avg ·) + DCV = PWM output maximum voltage Vin-DCV) * (Dtl / Dtl + Dt2) + DCV = (Vin - DCV) * D + DCV.---------------1 If the positive cycle ratio Duty is set from 〇% to 100%: Α· When the DC voltage DCV is turned on to the motor Renyi adjustable voltage range (Vo Rang) The voltage can be set from the minimum (Min) voltage to the maximum (Max) Vin input voltage. B. When the first voltage source V source 1 + the second voltage source V source 2 DC voltage is off, the Vo output voltage (to the motor voltage) is 0V. The following is a DC brushless fan motor: The second voltage source V source 2 is the second voltage DCV if it is DC 4V. The first voltage source V source 1 is 12V, the motor input maximum voltage (Vin) is 12V positive cycle ratio (duty cycle)]) Uty cycle D at 0.4. The output voltage Output voltage Vo is approximately equal to (Vin-DCV)* D + DCV. = (12V - 4V) * 〇. 4 + 4V = 8V * 0.4 + 4V Vo = 7 · 2V (DC voltage) Another Duty cycle D at 〇. 8 VDC output is 10. 4V (DC voltage ). The above-mentioned DC motor dual power supply speed control method, wherein the micro-chip (Micro P) controller with built-in computer software shown in the third figure can be controlled by an electronic circuit to achieve its control output. In the four figures, the hard volume circuit 6 201134083 is used in conjunction with the electronic circuit to achieve the purpose of adjusting the control output. The circuit diagrams of the third and fourth figures are only possible as evidence of the implementation of the present invention, and the content is not It is intended to be a limitation of the method of the present invention. The circuit of the third figure is a method for achieving the purpose of the present invention by using a microchip (Micro P) controller with built-in computer software, and the microchip controller (16) is composed of voltage, rotational speed (RPM), positive and negative cycles. Control (Duty) feedback and control the output by the software processing pulse width modulation (pwM) circuit on or off;

The contact voltage 5 is the second voltage source Vsource2DCV, the contact point is connected to the Micro P, and the software R2, R3 controls the TR1 transistor to be turned on or off, and the first voltage source is provided by D01. The D01 isolation diode is the isolated first voltage. Source v source 1; contact V is to provide DC voltage input to M〇SFET q〇2, while boat bow light is used as PWM switch (switching) 'Vin is PWM output maximum voltage, by microchip controller (1 6) Contact P pushes the circuit Ri, ci, TR2 transistor, R01, R02 to control the second voltage source output; Contact R connects the Micro P to the speed (RPM) voltage, the number of revolutions, the duty cycle (duty cycle), current , temperature, frequency, speed feedback contact; inductor L01, capacitor EC02 provides appropriate filtering, its slight suitable filtering, can reduce power consumption; R08 is electric P and the device 'which can limit the inrush current (lnrush Current). The circuit of the fourth figure is the hard volume circuit (IC) and the electronic circuit to achieve the purpose of regulating and controlling the output. The voltage and the rotational speed (RPM) and the positive and negative cycle ratio (j) uty are formed by the hardware and the integrated circuit. Feedback and control of the pulse width modulation (PWM) circuit to adjust the output; U1A is the P-na oscillating circuit, mainly for controlling the integrated circuit (〖, resistor 7 201134083 for positive and negative cycle ratio (Duty) regulation, output voltage control Variable resistor. The circuit of the invention is added to a filter circuit (14), which comprises a current inrush limiting resistor R08, which can limit the surge current of the Inrush Current to less than 1/3 of the normal value, and effectively supply the load. Power, provide circuit safety and stability, and prevent the capacitor from generating a large wave (4) flow (1_-current) caused by long-term operation, resulting in leakage, failure or explosion. The pulse width modulation (1M) circuit of this circuit is only used. Appropriate θ filtering, the output voltage waveform is similar to the square wave high efficiency when the modulation is modulated, and the theoretical value is infinite when the ideal capacitor circuit is turned on. If the line resistance (r) provides current limitation, the electric current is limited. The circuit current surge current Ia=(Vin—VCE capacitor initial voltage + ESR capacitor equivalent impedance), however, the higher the wheel-in voltage (Vin), the larger the line current, so the R08 resistor can be added to limit its inrush current (Inrush "(9)士)

Ib=(Vin - VCEV(r+ESR+R08), the result is Ib<<Ia. LC is suitable for filtering non-rectifying L01, EC02 main function is to prevent the generation of abnormal sound (noise). The circuit pulse width modulation of the present invention ( The PWM) circuit operates at very low frequencies of about 100 Hz • plus or minus 60% at low frequencies, so it has high efficiency, such as motor speed control or regulation by voltage, number of revolutions, usage (duty cycle Duty cycle), current, temperature The frequency and speed feedback, and then the modulation control. [Simple diagram of the diagram] The first diagram is a block diagram of the operation principle of the present invention. The second diagram is a waveform diagram of the operation principle of the step-down circuit of the present invention. The three figures are circuit diagrams of embodiments of the present invention for achieving control or regulating output by means of a microchip with built-in computer software in combination with an electronic circuit. The fourth figure is an embodiment of the invention for achieving control or regulating output by means of a hard volume circuit in combination with an electronic circuit. Circuit diagram 201134083 [Description of main component symbols] DC power supply (DC) (1) First voltage source (1 1 ) Voltage band (1 1 A ), ( 1 1 B ), ( 1 1 C ), ( 1 1 D Second electric Source VDC ( 1 2 ) . Pulse width modulation (PWM) circuit (1 3 ) Filter circuit (1 4) t DC motor (1 5) Microchip controller or hard volume circuit adjustment controller (1 6) • Feedback circuit (1 7) DC input voltage (V) Motor input maximum voltage (Vin) = (PWM) Output maximum voltage time (t) Positive period (D 1 ) Negative period (D 2 ) Frequency (F )

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Claims (1)

201134083 VII. Patent application scope: 1. A DC motor dual power supply speed control method, which divides DC power (1) into a normal input voltage DC power supply (丄i) (referred to as the first voltage source) and - low voltage DC power supply (i 2 ) (referred to as second electric dust source) 'where the normal input voltage power supply (ii) leads the pulse width modulation (PWM) circuit (1 3) 'the pulse width modulation ( The pWM) circuit (1 3 ) s is filtered by the filter circuit (14) via a suitable inductor and capacitor, and then supplied to the DC motor (i 5), and the low voltage DC power supply (IC 2) At the same time, it supplies power to the DC motor (i 5 )' to achieve the purpose of DC motor dual power supply and power supply. 2. Apply the speed control method of DC motor dual power supply according to item 1 of the patent scope, in which the pulse width modulation (PWM) circuit (χ 3 ) is connected to a microchip (Micro P) with built-in software program. Or a hard volume circuit (IC) adjustment controller (16) and a feedback circuit (17), the microchip controller or the hard volume circuit adjustment controller (16) and the feedback circuit (1 7) And connected to the DC motor (1 5), according to which the DC motor (15) can provide information such as speed, temperature, voltage, current, power or positive and negative cycle ratio (Duty) to the feedback circuit (1 7) The speed of the DC motor is controlled and adjusted by controlling the microchip controller or the hardware circuit adjustment controller (16) and adjusting the output of the pulse width modulation (pwm) circuit (13). 3. The method for speed regulation of DC motor dual power supply according to Item 1 of the patent application scope, wherein the filter circuit (14) includes a current inrush limiting resistor, thereby limiting the surge current of the Inrush Current The current is input, the load power is effectively supplied, the circuit is safe and stable, and the leakage of the capacitor and the occurrence of a large inrush current (I nrush Current) under long-term operation are prevented. 5 '