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1. 发明授权

US07091681B2 Drive circuit for brushless DC fan motor 失效
公开(公告)号：US07091681B2
公开(公告)日：2006-08-15
申请号：US10819223
申请日：2004-04-07
申请人： Junnan Xi , Mitsuo Konno , Susumu Yamamoto
发明人： Junnan Xi , Mitsuo Konno , Susumu Yamamoto
IPC分类号： H02P7/06
CPC分类号： H02P6/08 , H02P6/10
摘要： A drive circuit for a brushless DC fan motor for rotating a rotor (permanent magnet) by a rotating magnetic field produced by turning on/off the flow of electric current to field coils by a signal to control terminals of switch elements in which switch sections are each connected in series with the field coils. When connecting capacitors for absorbing a current spike in parallel with the switch sections of the switch elements, resistors are each connected between the field coil and switch section, through which the capacitors are connected in parallel with the switch sections. A discharge current of the capacitors which absorbed a current spike when turning on the switch elements is passed via the resistors, thereby eliminating a current spike.

2. 发明授权

US06713906B2 Pre-drive circuit for brushless DC single-phase motor 有权
标题翻译：无刷直流单相电机预驱动电路
公开(公告)号：US06713906B2
公开(公告)日：2004-03-30
申请号：US10353922
申请日：2003-01-30
申请人： Junnan Xi
发明人： Junnan Xi
IPC分类号： H02K700
CPC分类号： H02P7/04 , H02P6/26
摘要： A pre-drive circuit for a brushless DC single-phase motor controls a motor rotational speed by driving a drive circuit for the motor. The drive circuit includes four switching elements, namely, two power-supply-side switching elements and two ground-side switching elements connected in an H configuration bridge across a motor coil of the motor. A control voltage above a power supply voltage is required to turn on the two power-supply-side switching elements. The pre-drive circuit to produce a signal for controlling the switching elements is formed of an inexpensive logic circuit. Signals for controlling the two power-supply-side switching elements are amplified to a voltage level above a power supply voltage by 4 V by operational amplifiers. Drive signal input circuits for feeding signals for controlling the two ground-side switching elements to control input terminals of the two ground-side switching elements are formed of mere respective resistors.
摘要翻译：用于无刷直流单相电动机的预驱动电路通过驱动用于电动机的驱动电路来控制电动机的转速。驱动电路包括四个开关元件，即两个电源侧开关元件和两个接地侧开关元件，其连接在电动机的电动机线圈上的H形桥中。需要高于电源电压的控制电压来接通两个电源侧开关元件。用于产生用于控制开关元件的信号的预驱动电路由廉价的逻辑电路形成。用于控制两个电源侧开关元件的信号通过运算放大器被放大到高于电源电压4V的电压电平。用于馈送用于控制两个接地侧开关元件以控制两个接地侧开关元件的输入端的信号的驱动信号输入电路由仅仅相应的电阻器形成。

3. 发明授权

US06879120B2 Speed control circuit of brushless DC fan motor 失效
标题翻译：无刷直流风扇电机调速电路
公开(公告)号：US06879120B2
公开(公告)日：2005-04-12
申请号：US10782809
申请日：2004-02-23
申请人： Junnan Xi
发明人： Junnan Xi
IPC分类号： F04D27/00 , H02P6/06 , H02P6/08 , H02P1/18
CPC分类号： H02P6/08
摘要： There is provided a brushless DC fan motor which can eliminate an oscillator for PWM, control the motor speed at a low cost with high accuracy, and efficiently adjust the temperature in a housing for electronic appliances when radiating the heat in the housing. The brushless DC fan motor with the rotational speed thereof controlled by controlling the voltage of a control input terminal of a drive circuit comprises a differential amplifier in which the voltage signal for controlling the speed is inputted in a first input terminal and the reference voltage signal is inputted in a second input terminal. The differential amplifier is linear in the input-output characteristic, and can set the rise characteristic of a desired gradient, and control the motor speed with high accuracy without using the PWM signal for the input signal. The voltage signal from the output terminal of the differential amplifier is given to the control input terminal of the drive circuit.
摘要翻译：提供了一种无刷直流风扇电机，可以消除PWM振荡器，高精度地以低成本控制电机速度，并且在辐射壳体中的热量时有效地调节电子设备的外壳中的温度。通过控制驱动电路的控制输入端子的电压来控制其转速的无刷直流风扇电动机包括差分放大器，其中用于控制速度的电压信号被输入到第一输入端子中，并且参考电压信号为输入到第二输入端。差分放大器在输入输出特性中是线性的，并且可以设置所需梯度的上升特性，并且高精度地控制电机速度，而不需要使用PWM信号作为输入信号。来自差分放大器的输出端的电压信号被提供给驱动电路的控制输入端。

4. 发明授权

US07005813B2 Booster circuit for a pre-drive circuit of a brushless direct current single-phase motor 失效
标题翻译：无刷直流单相电机预驱动电路的增压电路
公开(公告)号：US07005813B2
公开(公告)日：2006-02-28
申请号：US10719010
申请日：2003-11-24
申请人： Junnan Xi
发明人： Junnan Xi
IPC分类号： H02P1/02 , H02P1/18 , G05F1/10 , H02M3/24
CPC分类号： H02P6/34 , H02M2001/009
摘要： A booster circuit for a pre-drive circuit of a brushless direct current single-phase motor. When a series pair of power FETs of the drive circuit turn on, one boost control switching element of the pre-drive circuit turns on, another series pair of power FETs of the drive circuit turn off, and the other boost control switching element of the pre-drive circuit turns off. The booster circuit provides a continuous stable output voltage to the motor.
摘要翻译：一种用于无刷直流单相电机的预驱动电路的升压电路。当串联的驱动电路的一对功率FET导通时，预驱动电路的一个升压控制开关元件导通，驱动电路的另一个串联的功率FET对关断，另一个升压控制开关元件预驱动电路关闭。升压电路为电机提供连续稳定的输出电压。

5. 发明授权

US06909252B2 Pre-drive circuit for brushless DC single-phase motor 有权
标题翻译：无刷直流单相电机预驱动电路
公开(公告)号：US06909252B2
公开(公告)日：2005-06-21
申请号：US10811970
申请日：2004-03-30
申请人： Junnan Xi
发明人： Junnan Xi
IPC分类号： H02M7/538 , H02P6/00 , H02P6/08 , H03K17/06 , H02P1/18
CPC分类号： H02P6/085 , H02M7/538 , H02P6/26 , H03K17/063
摘要： A pre-drive circuit for a brushless DC single-phase motor permits a cost reduction and an easy adjustment for the control input voltage of a switching device adjacent to a power source in a wider range, especially in increasing the control input voltage. In a drive circuit having four switching devices making up an H-bridge circuit with a motor coil being sandwiched therebetween, a control voltage exceeding a power supply voltage is required to turn ON the switching devices adjacent to the power source. The pre-drive circuit changes the duty ratio of the control voltage controlling motor speed. A circuit unit for generating pulse signals for controlling the switching devices uses an inexpensive logic circuit. Drive circuits receiving step-up voltages to amplify the pulse signals for controlling the switching devices adjacent to the power source to a level exceeding the power supply voltage and supplying the amplified pulse signals to the control input terminals of the switching devices adjacent to the power source are separately configured from peripheral circuits.
摘要翻译：用于无刷直流单相电动机的预驱动电路允许成本降低并且容易地调节在较宽范围内与电源相邻的开关装置的控制输入电压，特别是在增加控制输入电压。在具有四个开关装置的驱动电路中，其中夹在电机线圈之间的H桥电路构成，需要超过电源电压的控制电压来接通与电源相邻的开关装置。预驱动电路改变控制电压控制电机转速的占空比。用于产生用于控制开关装置的脉冲信号的电路单元使用廉价的逻辑电路。驱动电路接收升压电压以放大用于控制与电源相邻的开关器件的脉冲信号至超过电源电压的电平，并将放大的脉冲信号提供给与电源相邻的开关器件的控制输入端由外围电路单独配置。

6. 发明授权

US06674257B2 Current limiting circuit of brushless DC fan motor 有权
标题翻译：无刷直流风扇电机限流电路
公开(公告)号：US06674257B2
公开(公告)日：2004-01-06
申请号：US10178509
申请日：2002-06-25
申请人： Junnan Xi
发明人： Junnan Xi
IPC分类号： H02P608
CPC分类号： H02P6/28
摘要： There is provided a current limiting circuit to eliminate any harsh grating noise attributable to the decrease in an ON-OFF frequency of an electrified current from a normal range, for example, below 1 kHz when starting a brushless DC fan motor. In the current limiting circuit to limit the current by shutting off field coils to be electrified for a period in which the control voltage exceeds the reference voltage by the output signal of a comparator in which a current-detecting resistor is interposed in electrified passages of the field coils of the brushless DC fan motor to compare the voltage according to the voltage produced across the current-detecting resistor as the control voltage with the reference voltage according to the current to be limited when the motor is started or the like, a differential amplifier is interposed between the current-detecting resistor and the comparator to improve the comparative accuracy between the control voltage with the reference voltage in the comparator so that the accuracy is not easily affected by malfunction factors.
摘要翻译：提供了一种限流电路，用于消除由起动无刷直流风扇电动机时的正常范围（例如低于1kHz）导致的通电电流的导通截止频率的降低引起的任何恶劣的光栅噪声。在电流限制电路中，通过将电流检测电阻器插入在电流检测电阻器的通电通路中的比较器的输出信号，通过将控制电压超过基准电压的周期切断励磁线圈来限制电流无刷直流风扇电动机的励磁线圈根据电流检测电阻器产生的电压作为控制电压，根据电动机启动时要限制的电流等参考电压进行比较，差分放大器插入在电流检测电阻和比较器之间，以提高比较器中的参考电压的控制电压之间的比较精度，使得精度不容易受到故障因素的影响。

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