TWI414682B - Integrated fan driver apparatus - Google Patents

Abstract

An integrated fan driver apparatus includes an AC-to-DC circuit, a voltage step-down circuit electrically connected to the AC-to-DC circuit, a stable-voltage circuit electrically connected to the voltage step-down circuit, a microcontroller unit electrically connected to the stable-voltage circuit, a dc motor driving circuit electrically connected to the microcontroller unit and the voltage step-down circuit, a temperature variation sensor unit electrically connected to the microcontroller unit, a fan motor status output unit electrically connected to the microcontroller unit, and a motor unit electrically connected to the dc motor driving circuit. The dc motor driving circuit is controlled by the microcontroller unit to drive the motor unit.

Description

Integrated fan drive

The invention relates to a fan driving device, in particular to an integrated type

Modern people use a large number of fans, such as adjusting ventilation, cooling computers and instruments, etc.; if there is no fan, it will cause considerable inconvenience to our life or technological development.

However, most of the conventional fans need to be connected to the mains AC by an external transformer to be converted into DC power; and the conventional fan does not have the ability to integrate output or input signals; these are the disadvantages of conventional fans.

In order to improve the above disadvantages of the prior art, it is an object of the present invention to provide an integrated fan drive apparatus.

In order to achieve the above object of the present invention, an integrated fan driving device of the present invention comprises: an AC to DC circuit; a step-down circuit electrically connected to the AC to DC circuit; and a voltage stabilizing circuit The voltage circuit is electrically connected to the step-down circuit; a microcontroller unit electrically connected to the voltage stabilizing circuit; and a DC motor driving circuit electrically connected to the microcontroller Unit and the step-down circuit; a temperature change induction The temperature change sensing unit is electrically connected to the microcontroller unit; a fan motor state output unit, the fan motor state output unit is electrically connected to the microcontroller unit; and a motor unit, the motor unit is electrically Connected to the DC motor drive circuit. The microcontroller unit is configured to control the DC motor drive circuit to drive the motor unit.

10‧‧‧Integrated fan drive

102‧‧‧AC to DC circuit

104‧‧‧Buck circuit

106‧‧‧Microcontroller unit

108‧‧‧Motor unit

110‧‧‧DC motor drive circuit

112‧‧‧Magnetic sensing elements

114‧‧‧ Pulse width modulation signal unit

116‧‧‧Temperature change sensing unit

118‧‧‧Voltage change sensing unit

120‧‧‧High voltage alternating current

122‧‧‧High voltage DC

124‧‧‧Low-voltage DC

126‧‧‧ Pulse width modulation signal

128‧‧‧ Voltage signal of temperature change

130‧‧‧Variable change signal

134‧‧‧Negative temperature coefficient thermistor

136‧‧‧Positive temperature coefficient thermistor

138‧‧‧Variable resistor

140‧‧‧ Comparator

142‧‧‧Bridge rectifier

144‧‧‧ varistor

146‧‧‧First coupled isolation circuit

148‧‧‧Fan motor status output unit

150‧‧‧Second coupled isolation circuit

152‧‧‧Variable circuit

The first figure is a block diagram of the integrated fan drive device of the present invention.

Please refer to the first figure, which is a block diagram of the integrated fan driving device of the present invention. The integrated fan driving device 10 of the present invention is applied to a pulse width modulation signal unit 114. The integrated fan driving device 10 includes an AC to DC circuit 102, a step-down circuit 104, a microcontroller unit 106, and a The motor unit 108, the DC motor drive circuit 110, a magnetic induction element 112, a temperature change sensing unit 116, a voltage change sensing unit 118, a first coupling isolation circuit 146, a fan motor state output unit 148, and a second coupling The isolation circuit 150 and a voltage stabilization circuit 152.

The AC-DC circuit 102, the step-down circuit 104, the voltage stabilization circuit 152, the microcontroller unit 106, the DC motor drive circuit 110, the magnetic induction element 112, the fan motor state output unit 148, and the temperature change induction Unit 116 may be collectively referred to as a microcontroller integrated circuit (not shown). In a practical embodiment, the fan motor status output unit 148 may be included in the integrated circuit of the microcontroller unit 106 as one of the functions of the microcontroller unit 106; the fan motor status output unit 148 Output speed output letter No., stop or running status output signal or fan stop alarm output signal.

The microcontroller unit 106 is electrically connected to the voltage stabilizing circuit 152, the temperature change sensing unit 116, the voltage change sensing unit 118, the DC motor driving circuit 110, the magnetic sensing element 112, the first coupling isolation circuit 146, and The fan motor state output unit 148; the step-down circuit 104 is electrically connected to the AC-DC circuit 102, the DC motor drive circuit 110, and the voltage stabilization circuit 152; the motor unit 108 is electrically connected to the magnetic induction element 112 and The DC motor driving circuit 110 is electrically connected to the first coupling isolation circuit 146; the second coupling isolation circuit 150 is electrically connected to the fan motor state output unit 148.

The AC to DC circuit 102 includes a bridge rectifier 142, a varistor 144, a current limiting group (not shown), and an overvoltage suppressor (not shown). The varistor 144 is used to prevent power surges from damaging the circuit; the current limiting resistor can also be replaced by a fuse (not shown) to prevent a short circuit caused by abnormal aging of the circuit. The AC-DC circuit 102 is configured to convert the step-down circuit 104 and the voltage stabilizing circuit 152 to convert the high-voltage direct current 122 into a low-voltage direct current 124. The conventional fan is designed to use an external transformer to achieve alternating current, direct current, and voltage reduction. The integrated fan driving device of the present invention integrates the step-down circuit 104 and the voltage stabilizing circuit 152 into an internal circuit of the fan. The voltage circuit 104 and the voltage stabilization circuit 152 achieve the purpose of step-down and voltage regulation. The step-down circuit 104 includes a bias resistor (not shown), a voltage stabilizing capacitor (not shown), an N-type MOS field effect transistor (not shown), and an NPN. Parts such as transistors (not shown).

The magnetic sensing element 112 is configured to detect a magnetic pole (N pole or S pole) of a magnetically magnetized object (not shown, such as a magnet, a magnetic strip or a magnetic ring, in a fan blade rotor) to provide the microcontroller integration. The circuit control controls the switching control of the switching elements of the corresponding coil motor (single-phase or three-phase) (not shown, such as a transistor, a MOS field effect transistor, an insulated gate bipolar transistor, a 矽-controlled rectifier or a three-terminal bidirectional The DC motor drive circuit 110, which is composed of a controllable element, controls an armature winding (not shown) of the motor unit 108 for electromagnetic field switching.

The pulse width modulation signal unit 114 is an external PWM signal output device for outputting a temperature change sensing unit 116 including a negative temperature coefficient thermistor 134 or a positive temperature coefficient thermistor 136; the temperature change sensing unit The 116 system is configured to output a temperature change voltage signal 128 to the microcontroller unit 106 to control the DC motor drive circuit 110 to drive the motor unit 108, and then rotate the fan unit to change the fan speed.

The voltage change sensing unit 118 includes a variable resistor 138 or a comparator 140. The voltage change sensing subunit 118 is configured to output a voltage change signal 130 to the microcontroller integrated circuit 106 to control the DC motor driving circuit. The motor unit 108 is driven 110, and the fan unit is rotated to change the fan speed. The voltage change signal 130 can also be manually controlled.

The microcontroller unit 106 has powerful input and output integration capabilities by integrating the magnetic sensing element 112, the pulse width The pulse width modulation signal 126 outputted by the modulation signal unit 114, the temperature change sensing unit 116 and the voltage variation sensing unit 118 output a PWM modulation voltage control signal (not shown) to control the DC motor driving circuit 110. The motor unit 108 is driven to control the change in the rotational speed of the fan unit. The microcontroller unit 106 can also drive a light emitting diode (not shown) or a buzzer (not shown) to issue an alert when, for example, detecting that the fan as a whole or the motor unit 108 is damaged or foreign matter is not rotating. .

The motor unit 108 is a hard body of a fan motor, and includes an armature winding (not shown) composed of a coil (not shown), a silicon steel sheet (not shown), and the like, and a rotor (including a magnetic element). The rotor of the motor unit 108 is a magnetically magnetized object (such as a magnet, a magnetic strip or a magnetic ring), and the fan blade shape and the shaft center can save the power output of the electromagnetic field of the conventional stator and the rotor; The soft start function of the controller unit 106 can reduce the startup power consumption, accurately limit the current consumption to save power consumption, and can accurately set the rotation speed.

The integrated fan driving device 10 further includes an optical coupling circuit (not shown); when the commercial high-voltage alternating current is converted into a high-voltage direct current signal output, the high-voltage component may generate high-voltage damage to the customer through abnormal short-circuit contact or The input low voltage circuit; therefore, the high and low voltage signal blocks are separated by the optical coupling circuit to avoid high voltage damage to the input and output circuits of the client application.

The integrated fan driving device of the invention directly converts the commercial alternating current into direct current, then steps down and adjusts the voltage, without external transformer; and integrates the circuit with the microcontroller to receive the external pulse width modulation signal and temperature sense. Measuring the temperature change voltage signal of the component circuit or manually controlling the voltage change signal, etc. The mode outputs a voltage control signal corresponding to the PWM modulation to control the DC motor drive circuit for driving the brushless motor (rotor, stator) to achieve the controlled speed of the fan speed change.

In summary, it is known that the present invention has industrial applicability, novelty and advancement, and the structure of the present invention has not been seen in similar products and public use, and fully complies with the requirements of the invention patent application, and is filed according to the patent law.

10‧‧‧Integrated fan drive

102‧‧‧AC to DC circuit

104‧‧‧Buck circuit

106‧‧‧Microcontroller unit

108‧‧‧Motor unit

110‧‧‧DC motor drive circuit

112‧‧‧Magnetic sensing elements

114‧‧‧ Pulse width modulation signal unit

116‧‧‧Temperature change sensing unit

118‧‧‧Voltage change sensing unit

120‧‧‧High voltage alternating current

122‧‧‧High voltage DC

124‧‧‧Low-voltage DC

126‧‧‧ Pulse width modulation signal

128‧‧‧ Voltage signal of temperature change

130‧‧‧Variable change signal

134‧‧‧Negative temperature coefficient thermistor

136‧‧‧Positive temperature coefficient thermistor

138‧‧‧Variable resistor

140‧‧‧ Comparator

142‧‧‧Bridge rectifier

144‧‧‧ varistor

146‧‧‧First coupled isolation circuit

148‧‧‧Fan motor status output unit

150‧‧‧Second coupled isolation circuit

152‧‧‧Variable circuit

Claims (9)

An integrated fan driving device comprises: an AC to DC circuit; a step-down circuit, the step-down circuit is electrically connected to the AC to DC circuit; and a voltage stabilizing circuit is electrically connected to the step-down circuit a microcontroller unit electrically connected to the voltage stabilizing circuit; a DC motor driving circuit electrically connected to the microcontroller unit and the buck circuit; a change sensing unit, the temperature change sensing unit is electrically connected to the microcontroller unit; a fan motor state output unit, the fan motor state output unit is electrically connected to the microcontroller unit; a motor unit, the motor unit is electrically Connected to the DC motor drive circuit; and a first coupled isolation circuit, the first coupled isolation circuit is electrically connected to the microcontroller unit, wherein the microcontroller unit is configured to control the DC motor drive circuit The motor unit is driven. The integrated fan drive device of claim 1, further comprising a magnetic induction element electrically connected to the microcontroller unit and the motor unit. For example, the integrated fan drive device of the patent application scope 1 includes a first The second coupled isolation circuit is electrically connected to the fan motor state output unit. The integrated fan drive device of claim 1, wherein the temperature change sensing unit comprises a negative temperature coefficient thermistor or a positive temperature coefficient thermistor. The integrated fan drive device of claim 2, further comprising a voltage change sensing unit electrically connected to the microcontroller unit. The integrated fan drive device of claim 5, wherein the voltage change sensing unit comprises a variable resistor. The integrated fan drive device of claim 5, wherein the voltage change sensing unit comprises a comparator. The integrated fan drive device of claim 1, wherein the AC to DC circuit comprises a bridge rectifier. The integrated fan drive device of claim 1, wherein the AC to DC circuit comprises a varistor.