Temperature signal collection circuit of quasi-resonance electromagnetic water heater
A temperature signal, acquisition circuit technology, applied in temperature control, fluid heaters, instruments, etc., can solve problems such as increased contact switches, easily affecting water temperature points, unsafe electric sparks or electric sparks, etc.
Inactive Publication Date: 2011-03-23
张军才 +1
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Problems solved by technology
[0002] In the electric water heaters in the prior art, the method of controlling the constant temperature is generally to adopt step-by-step adjustment, and to operate in conjunction with the size of the water flow and the basic water temperature, that is, to find the ideal water temperature point manually; The instability of the water temperature is easy to affect the water temperature, which in turn affects the mood of individual water use, which brings frequent operations, which will bring unsafe electric sparks or electric spark interference caused by the contact switch, and make the contact switch in the water. Greatly increased chance of damage in wet environments
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[0012] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
[0013] Such as figure 1 As shown, a quasi-resonant electromagnetic water heater temperature signal acquisition circuit, the circuit includes a photocoupler U2, a temperature sensor and DC low-voltage power supply +5V, the triode collector of the photocoupler U2 is connected to one end of the temperature sensor, the The other end of the temperature sensor is connected to a DC low-voltage power supply +5V, and the DC low-voltage power supply +5V is connected to the triode emitter of the photocoupler U2 through a capacitor C31, and a resistor R47 is connected in parallel at both ends of the temperature sensor, and the photocoupler The triode emitter of U2 is respectively connected to resistor R38 and capacitor C32 and then grounded, the diode cathode of the photocoupler U2 is connected to resistor R42 and then grounded, and the DC low voltage power...
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The present invention provides a temperature signal acquisition circuit in quasi-resonant electromagnetic heater, wherein the connection relationship is as following: one end of temperature sensor is connected to triode collector of photo coupler U2, the other end of temperature sensor connected to DC low voltage power supply; resistance R47 is connected in parallel to two ends of temperature sensor; triode emitter of photo coupler U2 is connected to ground after connection with resistance R38 and capacitance C32 separately; diode cathode of photo coupler U2 is connected to ground after connection with R42; DC low voltage power supply connected to ground after connection with resistance R46, adjustable resistance RV2, resistance R45 in series; diode anode of pot coupler U2 is connected between resistance R46 and adjustable resistance RV2; diode anode of photo coupler U2 is taken as input end SR after connection with resistance R48, triode emitter of photo coupler U2 is taken as outputend SC; The structure and principle of temperature signal collection circuit is simple with strong practicality, safety and reliability and stable operation.
Description
technical field [0001] The invention relates to a signal acquisition circuit, in particular to a quasi-resonance electromagnetic water heater temperature signal acquisition circuit. Background technique [0002] In the electric water heaters in the prior art, the method for controlling the constant temperature is generally to adopt step-by-step adjustment, and to operate with the size of the water flow and the basic water temperature, that is, to find the ideal water temperature point manually; due to the water pressure, voltage The instability of the water temperature is easy to affect the water temperature, which in turn affects the mood of individual water use, which brings frequent operations, which will bring unsafe electric sparks or electric spark interference caused by the contact switch, and make the contact switch in the water. The chance of damage in wet environments is greatly increased. [0003] The quasi-resonant electromagnetic water heater is a water heater ...
Claims
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IPC IPC(8): G05D23/20H05B6/06F24H9/20
Inventor 张军才杨建昌
Owner 张军才