Abstract: An apparatus comprises a sensor circuit configured to detect activation of at least one circulator arranged to circulate liquid from a boiler through at least one circulation loop and back to the boiler. An analog up/down timer circuit has an input coupled to an output of the sensor circuit and generates a variable threshold signal that varies as a function of an activation time of the at least one circulator. A burner control circuit receives the variable threshold signal from the analog up/down timer circuit and generates an ignition control signal based at least in part on comparison of a temperature sensor signal of the boiler with the variable threshold signal. An ignition driver receives the ignition control signal from the burner control circuit and generates an ignition signal for a burner configured to burn fuel to heat the liquid in the boiler based at least in part on the ignition control signal.

Abstract: An apparatus comprises a sensor circuit configured to detect activation of at least one circulator arranged to circulate liquid from a boiler through at least one circulation loop and back to the boiler. An analog up/down timer circuit has an input coupled to an output of the sensor circuit and generates a variable threshold signal that varies as a function of an activation time of the at least one circulator. A burner control circuit receives the variable threshold signal from the analog up/down timer circuit and generates an ignition control signal based at least in part on comparison of a temperature sensor signal of the boiler with the variable threshold signal. An ignition driver receives the ignition control signal from the burner control circuit and generates an ignition signal for a burner configured to burn fuel to heat the liquid in the boiler based at least in part on the ignition control signal.

Abstract: An apparatus comprises a sensor circuit configured to detect activation of at least one circulator arranged to circulate liquid from a boiler through at least one circulation loop and back to the boiler. An analog up/down timer circuit has an input coupled to an output of the sensor circuit and generates a variable threshold signal that varies as a function of an activation time of the at least one circulator. A burner control circuit receives the variable threshold signal from the analog up/down timer circuit and generates an ignition control signal based at least in part on comparison of a temperature sensor signal of the boiler with the variable threshold signal. An ignition driver receives the ignition control signal from the burner control circuit and generates an ignition signal for a burner configured to burn fuel to heat the liquid in the boiler based at least in part on the ignition control signal.

Abstract: An apparatus comprises a sensor circuit configured to detect activation of at least one circulator arranged to circulate liquid from a boiler through at least one circulation loop and back to the boiler. An analog up/down timer circuit has an input coupled to an output of the sensor circuit and generates a variable threshold signal that varies as a function of an activation time of the at least one circulator. A burner control circuit receives the variable threshold signal from the analog up/down timer circuit and generates an ignition control signal based at least in part on comparison of a temperature sensor signal of the boiler with the variable threshold signal. An ignition driver receives the ignition control signal from the burner control circuit and generates an ignition signal for a burner configured to burn fuel to heat the liquid in the boiler based at least in part on the ignition control signal.

Abstract: An analog timer circuit comprises a pulse source, a charge storage element, and a charge pump coupled between the pulse source and the charge storage element. A pulse signal generated by the pulse source is utilized to charge the charge storage element via the charge pump. The analog timer may further comprise a discharge pump coupled between the pulse source and the charge storage element. The pulse signal generated by the pulse source is also utilized to discharge the charge storage element via the discharge pump. For example, the charge pump and the discharge pump may be driven by respective ones of complemented and uncomplemented versions of the pulse signal generated by the pulse source. An up/down driver circuit is configured to select between charging of the charge storage element via the charge pump and discharging of the charge storage element via the discharge pump.

Abstract: An analog timer circuit comprises a pulse source, a charge storage element, and a charge pump coupled between the pulse source and the charge storage element. A pulse signal generated by the pulse source is utilized to charge the charge storage element via the charge pump. The analog timer may further comprise a discharge pump coupled between the pulse source and the charge storage element. The pulse signal generated by the pulse source is also utilized to discharge the charge storage element via the discharge pump. For example, the charge pump and the discharge pump may be driven by respective ones of complemented and uncomplemented versions of the pulse signal generated by the pulse source. An up/down driver circuit is configured to select between charging of the charge storage element via the charge pump and discharging of the charge storage element via the discharge pump.

Abstract: A ripple reducing circuit wherein ripple voltages across the output terminals of a voltage source are coupled through a ripple sensing circuit to an amplifier. The sensed ripple is amplified and phase reversed to provide signals in phase opposition to the ripple signals. These phase opposition signals are coupled via an anti-ripple element to the output terminals of the voltage source for effecting ripple level reduction.