Water quality maintenance warning circuit of water storage type electric water heater

Abstract

The utility model discloses a water quality maintenance warning circuit of a water storage type electric water heater, a reset circuit comprises an infrared geminate transistor LED1, a resistor R3, a main control chip, a resistor R5 and a phototriode Q1, the N end of the infrared geminate transistor LED1 is connected with the positive pole of a power supply, the N end of the infrared geminate transistor LED1 is connected with one end of the resistor R3, the other end of the resistor R3 is connected with a first pin of the main control chip, and the other end of the resistor R5 is connected with a second pin of the main control chip. The second pin of the main control chip is connected with the positive electrode of the power supply, one end of the resistor R5 is connected with the positive electrode of the power supply, the other end of the resistor R5 is connected with the third pin of the main control chip, the collector electrode of the phototriode Q1 is connected with the third pin of the main control chip, the emitter electrode of the phototriode Q1 is grounded, and the fourth pin of the main control chip is grounded; the LED light-emitting reminding circuit is composed of a light-emitting diode LED2 and a resistor R4, the N end of the light-emitting diode is connected with the positive electrode of the power source, the P end of the light-emitting diode is connected with the resistor R4, and the other end of the resistor R4 is connected with the fifth pin of the main control chip. The device is low in cost and high in practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic applications, and in particular to a water quality maintenance warning circuit for a storage type electric water heater. Background Art

[0002] Storage electric water heaters have high safety performance and clean energy. They can supply water in multiple ways, are low in cost and are widely used. Storage electric water heaters can store hot water for a long time or temporarily, and are equipped with a device to control or limit the water temperature. However, the long-term storage of water inside the storage electric water heater is prone to scaling problems in the inner tank, resulting in slow hot water output when the storage electric water heater is used. Mechanical storage electric water heaters cannot remind users to regularly clean the scale inside the storage electric water heater. Therefore, this application aims to add a circuit board to the mechanical storage electric water heater, thereby achieving the purpose of reminding users to regularly clean the scale inside the storage electric water heater. Utility Model Content

[0003] The utility model aims to provide a water quality maintenance warning circuit for a water storage type electric water heater in view of the current situation that the existing mechanical water storage type electric water heater lacks a water quality warning function, so as to achieve the purpose of prompting the user to regularly clean the scale in the water storage type electric water heater, so as to overcome the shortcomings of the prior art.

[0004] A water quality maintenance warning circuit for a water storage type electric water heater, wherein the water quality maintenance warning circuit is powered by a power supply circuit of a controller of the electric water heater, and is characterized in that: the water quality maintenance warning circuit comprises a reset circuit and an LED light emitting reminder circuit, the reset circuit comprises an infrared pair tube LED1, a resistor R3, a main control chip U2, a resistor R5 and a phototransistor Q1, the P end of the infrared pair tube LED1 is connected to the positive electrode of the power supply, the N end of the infrared pair tube LED1 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to the first pin of the main control chip U2, the second pin of the main control chip U2 is connected to the positive electrode of the power supply, one end of the resistor R5 is connected to the positive electrode of the power supply, the other end of the resistor R5 is connected to the third pin of the main control chip U2, the collector of the phototransistor Q1 is connected to the third pin of the main control chip, the emitter of the phototransistor Q1 is grounded, and the fourth pin of the main control chip U2 is grounded;

[0005] The LED light reminder circuit is composed of a light emitting diode LED2 and a resistor R4. The P end of the light emitting diode LED2 is connected to the positive pole of the power supply, the N end of the light emitting diode LED2 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the fifth pin of the main control chip U2.

[0006] The model of the main control chip U2 is 80C51.

[0007] The phototransistor Q1 is of NPN type.

[0008] The beneficial effects of the utility model are:

[0009] By adopting the timer function of the main control chip U2, the purpose of reminding the user to clean the scale regularly is achieved, thereby alleviating the scaling problem of the water storage electric water heater; and a simple and ingenious non-contact switch is built using the infrared diode LED1 and the phototransistor Q1 to reset the working state of the water quality maintenance warning circuit, thereby reducing the potential risk of electric shock caused by the user resetting by direct contact with electronic components.

[0010] The utility model is applied to a mechanical water storage type electric water heater, and can realize a water quality prompting function by adding a circuit board with low cost and simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is the water quality maintenance warning circuit diagram of the utility model;

[0012] Figure 2 This is a power supply circuit diagram of the utility model. DETAILED DESCRIPTION

[0013] In order to further explain the technical means and effects adopted by the utility model to achieve the predetermined purpose, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings and preferred embodiments:

[0014] The utility model discloses a water quality maintenance warning circuit for a water storage type electric water heater, wherein the water quality maintenance warning circuit is powered by a power supply circuit of a controller of the electric water heater. Figure 2 , the power supply circuit provides +5V power to the water quality maintenance warning circuit. Figure 1 The water quality maintenance warning circuit includes a reset circuit and an LED light-emitting reminder circuit. The reset circuit includes an infrared pair tube LED1, a resistor R3, a main control chip U2, a resistor R5 and a phototransistor Q1. The P end of the infrared pair tube LED1 is connected to the positive electrode of the power supply, the N end of the infrared pair tube LED1 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to the first pin of the main control chip U2, the second pin of the main control chip U2 is connected to the positive electrode of the power supply, one end of the resistor R5 is connected to the positive electrode of the power supply, the other end of the resistor R5 is connected to the third pin of the main control chip U2, the collector of the phototransistor Q1 is connected to the third pin of the main control chip, the emitter of the phototransistor Q1 is grounded, and the fourth pin of the main control chip U2 is grounded;

[0015] The LED light reminder circuit is composed of a light emitting diode LED2 and a resistor R4. The P end of the light emitting diode LED2 is connected to the positive pole of the power supply, the N end of the light emitting diode LED2 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the fifth pin of the main control chip U2.

[0016] The model used by the main control chip U2 is 80C51, and the model used by the phototransistor Q1 is NPN type.

[0017] As a functional embodiment of the utility model, the water quality maintenance warning circuit has two states, namely working state and alarm state:

[0018] In the working state, the main control chip U2 is in the timing state, the first pin of the main control chip U2 outputs a low level, the infrared tube LED1 is in the on state, the photosensitive transistor Q1 is in the off state because it cannot receive the infrared light emitted by the infrared tube LED1, the third pin of the main control chip U2 inputs a high level, the fifth pin of the main control chip U2 outputs a high level, and the LED light reminder circuit is in the off state (that is, the light emitting diode LED2 is off).

[0019] When the timing of the main control chip U2 ends, the water quality maintenance warning circuit enters the alarm state, U2 enters the alarm state, stops timing, the fifth pin of the main control chip U2 outputs a low level, and the LED light reminder circuit is in the on state (that is, the light emitting diode LED2 is lit), reminding the user to clean the scale, and the user is required to reset the circuit state.

[0020] When the scale is cleaned, the user will manually reset the timer. The timer reset operation is that the user puts his hand on the infrared tube LED1. Due to the shielding of the finger, the light of the infrared tube LED1 is reflected on the phototransistor Q1, and the phototransistor Q1 is turned on, so that the third pin of the main control chip U2 inputs a low level, and the water quality maintenance warning circuit resumes working state.

[0021] All components involved in the present invention may be general standard parts or components known to those skilled in the art, and their structures, principles and control methods are known to those skilled in the art through technical manuals or conventional experimental methods.

[0022] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, other circuits obtained by adopting the same or similar technical features as the above embodiments of the present invention are within the protection scope of the present invention.

Claims

1. A water quality maintenance warning circuit for a storage type electric water heater, wherein the water quality maintenance warning circuit is powered by a power supply circuit of a controller of the electric water heater, and is characterized in that: The water quality maintenance warning circuit includes a reset circuit and an LED light-emitting reminder circuit. The reset circuit includes an infrared pair tube LED1, a resistor R3, a main control chip U2, a resistor R5 and a phototransistor Q1. The P end of the infrared pair tube LED1 is connected to the positive electrode of the power supply, the N end of the infrared pair tube LED1 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to the first pin of the main control chip U2, the second pin of the main control chip U2 is connected to the positive electrode of the power supply, one end of the resistor R5 is connected to the positive electrode of the power supply, the other end of the resistor R5 is connected to the third pin of the main control chip U2, the collector of the phototransistor Q1 is connected to the third pin of the main control chip, the emitter of the phototransistor Q1 is grounded, and the fourth pin of the main control chip U2 is grounded; The LED light reminder circuit is composed of a light emitting diode LED2 and a resistor R4. The P end of the light emitting diode LED2 is connected to the positive pole of the power supply, the N end of the light emitting diode LED2 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the fifth pin of the main control chip U2.

2. The water quality maintenance warning circuit of the storage type electric water heater according to claim 1, characterized in that: The model of the main control chip U2 is 80C51.

3. The water quality maintenance warning circuit of the storage type electric water heater according to claim 1, characterized in that: The phototransistor Q1 is of NPN type.

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