Emerson Electric Company

Cuiyun Chen

Xingeng Zhou

Yindan Zhang

Yonglong Hu

A safety gas valve relay driving circuit for an HVAC system includes a gas valve relay including an output for selectively enabling and disabling a gas valve in an HVAC system according to an energization state of the gas valve relay, and a charge pump circuit to control energization of the gas valve relay. The charge pump circuit includes a charge pump capacitor. The driving circuit also includes first and second inputs for receiving first and second driving signals from at least one controller, a low-pass filter coupled between the first input and the charge pump circuit to filter the received first driving signal, and a high-pass filter watchdog circuit coupled between the second input and the charge pump circuit to filter the received second driving signal. Example methods of driving a gas valve relay for an HVAC system are also disclosed.

Safety gas valve relay driving circuits

Disclosed are exemplary embodiments of relay drive circuits. In an exemplary embodiment, a relay drive circuit generally includes a first diode, a second diode, a third diode, a first transistor, a second transistor, a first capacitor, and a second capacitor. The relay drive circuit is operable to transform an AC voltage to a DC voltage, and then use the DC voltage to control on/off of the relay.

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Jiangsu, China

Cuiyun Chen