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1.发明授权Interface circuit having improved isolation among signals for use with a variable speed electrically commutated fan motor 失效接口电路具有改进的与可变速电气换向风扇电机一起使用的信号之间的隔离
公开(公告)号：US5397970A
公开(公告)日：1995-03-14
申请号：US873093
申请日：1992-04-24
CPC分类号： F24F11/0009 , H02P6/34 , F24F11/0079 , Y02B30/746
摘要： A low voltage terminal board interfaces a fan motor with a field thermostat. The board includes a power supply providing a 24 volt DC power source for driving an electronic air cleaner relay and fan motor control lines and a 5 volt DC power source for providing optical isolation and timing logic. Several heater stage signals are connected to a diode interlock network so that no matter which signal is generated the first electric stage heater is energized. A first optically coupled isolator receives a 240 volt AC input whenever the first stage electric heater is energized with the isolator output controlling energization of a heat or medium speed operation of the fan motor. Second and third optically coupled isolators receive a 24 volt AC input indicative of continuous fan operation and compressor operation respectively with the outputs controlling energization of low (on/off) fan speed operation and high speed fan operation respectively. A timing circuit is interconnected between the third optically coupled isolator and the high speed fan terminal to provide a delayed off period of fan operation. Diode interconnections ensure that the on/off terminal is energized anytime the high speed terminal or the first stage electric heater is energized and anytime the on/off line is energized the electronic air cleaner relay is energized.
摘要翻译： 低压端子板将风扇电机与现场温控器接口。 该电路板包括一个电源，提供24伏直流电源，用于驱动电子空气滤清器继电器和风扇电机控制线，以及一个5伏直流电源，用于提供光隔离和定时逻辑。 几个加热器级信号连接到二极管互锁网络，使得无论哪个信号被产生，第一电级加热器通电。 每当第一级电加热器通过隔离器输出通电以控制风扇马达的热或中速运行的通电时，第一光耦合隔离器接收240伏交流输入。 第二和第三光耦合隔离器分别接收指示连续风扇运行和压缩机运行的24伏交流输入，输出分别控制低（开/关）风扇转速运行和高速风扇运行的通电。 定时电路在第三光耦合隔离器和高速风扇端子之间互连，以提供风扇运行的延迟关闭周期。 二极管互连确保在高速端子或第一级电加热器通电的任何时候开/关端子都通电，并且任何时候通/断电源使电子空气滤清器继电器通电。
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公开(公告)号：US5572104A
公开(公告)日：1996-11-05
申请号：US495134
申请日：1995-06-27
CPC分类号： F23N5/203 , F23N2023/08 , F23N2027/16 , F23N2031/20 , F23N2033/02 , F23N2033/08 , Y10S388/934
摘要： An electric control for gas furnaces which controls a two speed main blower fan and an induction draft fan based on inputs from a room thermostat, a high limit and an ignition control including a gas valve. The control has a circuit board having a power supply for providing 24 volts DC current source to drive DC relays and a 5 volt DC power source to power a microprocessor. 24 volt AC input signals are coupled to the input ports of the microprocessor through current limiting resistors and to AC ground through pull down resistors. AC ground is also connected to the IRQ port of the microprocessor. The output ports of the microprocessor are connected to a relay driver which in turn is connected to the relays. Several breakaway tabs in the board provide optional features such as eliminating a normally provided draft delay timing function. Test pads are provided on the board so that the board can be tested during manufacture. An optional feature is shown comprising an LED which can be used to indicate the status of the system. Another optional feature incorporates a zener diode and resistor coupled to each input port to increase input thresholds. This feature is provided for use with power stealing electronic thermostats.The control calibrates itself on a continuing periodic basis to read the AC inputs synchronously at the peak of their wave and switches the relays asynchronously based on the real time clock of the microprocessor.
摘要翻译： 基于来自房间恒温器，上限和包括气阀的点火控制器的输入，控制二速主鼓风机和吸风通风机的气体炉的电控制。 该控制器具有电路板，该电路板具有用于提供24伏直流电流源以驱动直流继电器的电源和5伏直流电源来为微处理器供电。 24伏交流输入信号通过限流电阻耦合到微处理器的输入端口，并通过下拉电阻耦合到交流接地。 交流接地也连接到微处理器的IRQ端口。 微处理器的输出端口连接到继电器驱动器，继电器驱动器又连接到继电器。 板上的几个分离标签提供了可选的功能，例如消除正常提供的草稿延迟定时功能。 在板上提供测试垫，以便板可以在制造过程中进行测试。 示出了包括可用于指示系统的状态的LED的可选特征。 另一个可选功能包括耦合到每个输入端口的齐纳二极管和电阻器，以增加输入阈值。 此功能提供用于窃电电子恒温器。 该控制器在持续的周期性基础上自行校准，以在其波峰值同步读取交流输入，并基于微处理器的实时时钟异步地切换继电器。
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公开(公告)号：US5530615A
公开(公告)日：1996-06-25
申请号：US163782
申请日：1993-12-06
CPC分类号： H01H9/56 , H01H2009/566 , Y10T307/951
摘要： An electronic control for gas furnaces controls a two speed main blower fan and an induction draft fan based on 24 volt input signals from a room thermostat, a high limit and an ignition control including a gas valve. The input signals are coupled to input ports of a microprocessor through current limiting resistors and to AC ground through pull down resistors. AC ground is also connected to the IRQ port of the microprocessor. Output ports of the microprocessor are connected to a relay driver which in turn is connected to relays for energizing and de-energizing the fans. The control calibrates itself on a continuing periodic basis to read the AC inputs synchronously at the peak of their wave and can switch the relays asynchronously based on the Real Time Clock of the microprocessor or can be switched synchronously by providing a selected delay so that contact engagement and disengagement occurs at or near the zero crossing of the AC line voltage wave form. When used with resistive loads the relays are switch in response to a signal from the microprocessor which is delayed based on the mechanical switching time constant of the relays to provide contact closure and opening at the selected point on the AC line voltage wave form. An alternate embodiment shows a feedback network used to calibrate the specific delay period for each relay upon initialization. When used with inductive loads contact closing can be effected synchronously and contact opening asynchronously.
摘要翻译： 燃气炉的电子控制器基于来自室温恒温器，上限和包括气阀的点火控制器的24伏输入信号来控制双速主鼓风机和引风机。 输入信号通过限流电阻耦合到微处理器的输入端口，并通过下拉电阻耦合到交流电源。 交流接地也连接到微处理器的IRQ端口。 微处理器的输出端口连接到继电器驱动器，继电器驱动器又连接到继电器，以使风扇通电和断电。 控制器在持续的周期性基础上自行校准，以在其波峰值同步读取AC输入，并且可以基于微处理器的实时时钟异步地切换继电器，或者可以通过提供所选择的延迟来同步地切换继电器，使得接触接合 并且在AC线电压波形的过零点处或附近发生分离。 当与电阻性负载一起使用时，继电器响应于来自微处理器的信号而被切换，该信号基于继电器的机械开关时间常数被延迟，以在交流线路电压波形上的选定点处提供触点闭合和断开。 替代实施例示出了用于在初始化时校准每个继电器的特定延迟周期的反馈网络。 当与感性负载一起使用时，触点闭合可以同步进行并且异步接触。
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公开(公告)号：US5272427A
公开(公告)日：1993-12-21
申请号：US886275
申请日：1992-05-20
CPC分类号： F23N5/203 , F23N2023/08 , F23N2027/16 , F23N2031/20 , F23N2033/02 , F23N2033/08 , Y10S388/934
摘要： An electric control for gas furnaces which controls a two speed main blower fan and an induction draft fan based on inputs from a room thermostat, a high limit and an ignition control including a gas valve. The control has a circuit board having a power supply for providing 24 volts DC current source to drive DC relays and a 5 volt DC power source to power a microprocessor. 24 volt AC input signals are coupled to the input ports of the microprocessor through current limiting resistors and to AC ground through pull down resistors. AC ground is also connected to the IRQ port of the microprocessor. The output ports of the microprocessor are connected to a relay driver which in turn is connected to the relays. Several breakaway tabs in the board provide optional features such as eliminating a normally provided draft delay timing function. Test pads are provided on the board so that the board can be tested during manufacture. An optional feature is shown comprising an LED which can be used to indicate the status of the system. Another optional feature incorporates a zener diode and resistor coupled to each input port to increase input thresholds. This feature is provided for use with power stealing electronic thermostats.The control calibrates itself on a continuing periodic basis to read the AC inputs synchronously at the peak of their wave and switches the relays asynchronously based on the real time clock of the microprocessor.
摘要翻译： 基于来自房间恒温器，上限和包括气阀的点火控制器的输入，控制二速主鼓风机和吸风通风机的气体炉的电控制。 该控制器具有电路板，该电路板具有用于提供24伏直流电流源以驱动直流继电器的电源和5伏直流电源来为微处理器供电。 24伏交流输入信号通过限流电阻耦合到微处理器的输入端口，并通过下拉电阻耦合到交流接地。 交流接地也连接到微处理器的IRQ端口。 微处理器的输出端口连接到继电器驱动器，继电器驱动器又连接到继电器。 板上的几个分离标签提供了可选的功能，例如消除正常提供的草稿延迟定时功能。 在板上提供测试垫，以便板可以在制造过程中进行测试。 示出了包括可用于指示系统的状态的LED的可选特征。 另一个可选功能包括耦合到每个输入端口的齐纳二极管和电阻器，以增加输入阈值。 此功能提供用于窃电电子恒温器。 该控制器在持续的周期性基础上自行校准，以在其波峰值同步读取交流输入，并基于微处理器的实时时钟异步地切换继电器。
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