CN201839485U

CN201839485U - Circuit for display controller of electric water heater

Info

Publication number: CN201839485U
Application number: CN201020547690XU
Authority: CN
Inventors: 徐丰
Original assignee: KANGQUN ELECTRIC APPLIANCE CO Ltd ZHEJIANG
Current assignee: KANGQUN ELECTRIC APPLIANCE CO Ltd ZHEJIANG
Priority date: 2010-09-29
Filing date: 2010-09-29
Publication date: 2011-05-18
Anticipated expiration: 2020-09-29

Abstract

The utility model discloses a circuit for a display controller of an electric water heater. The circuit comprises a microcontroller, and two groups of backlight circuits consisting of resistors, triodes and light-emitting diodes. The two groups of backlight source circuits are respectively controlled by the microcontroller at different times for work, the circuit of the display controller is arranged in a display (screen) of the electric water heater, so that the display screen of the electric water heater can realize the alternate color change of background light, further the defects that the display screen can not display when in the screen saving state is overcome, and the attenuation time of the illumination of the display can be prolonged.

Description

Display controller circuit of electric water heater

Technical Field

The utility model relates to a domestic appliance accessory especially relates to a color interchangeable electric water heater's display controller circuit.

Background

In recent years, along with the improvement of living standard of people, the development of intelligent household appliances is more and more rapid, a new living mode is advocated, and the microcomputer control type electric water heater also gradually becomes a part of fashionable life of people. In the prior bathroom decoration, many owners want to install the electric water heater in a hidden way, namely, the electric water heater main body is installed and hidden in a suspended ceiling of a bathroom, and a display of the electric water heater is separated from the electric water heater main body and is installed on the wall of the bathroom through a signal connecting line to be integrated with the overall decoration style of the bathroom.

Therefore, many manufacturers make improvements on the display controller of the electric water heater, for example, the design of separating the display of the electric water heater from the main body of the water heater, and a user can display and read data and functions through the display controller when using the electric water heater, so that the electric water heater can be visually operated at a glance, and the use is very convenient. However, it is known that the display controller may cause a problem of fading of brightness in a long-term lighting state over time. The method is more common at present: the screen protection method is adopted, namely, the light of the display controller is lightened when the display controller is used, and the light is turned off when the display controller is not used, so that the lightening time of the display controller is shortened as much as possible, and the attenuation period of the display in use is prolonged. However, this method causes no content display when the display is in the screen saver state, which causes inconvenience for the user to read the use data and functions of the electric water heater.

SUMMERY OF THE UTILITY MODEL

In view of the above, the main objective of the present invention is to provide a display controller circuit of an electric water heater, which enables a display screen of the electric water heater to realize color alternation of background light, thereby overcoming the disadvantage that the display has no content display in a screen protection state, and prolonging the decay time of the brightness of the display.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

a display controller circuit of an electric water heater mainly comprises:

the microcontroller and the A path and the B path which are connected with the microcontroller share two paths of backlight source circuits; the A, B two backlight source circuits have the same structure, and the A path comprises a resistor R1, a triode T1 and a group of light emitting diode groups; the circuit B comprises a resistor R2, a triode T2 and a B-group light-emitting diode group; wherein,

one end of the resistor R1 of the A path is connected with a control interface of the microcontroller, the other end is connected with the base electrode of the triode T1, the group a of light emitting diodes are connected with the emitting electrode of the triode T1, the collecting electrode of the triode T1 is connected with a +5V direct current power supply, and the other end of the group a of light emitting diodes is grounded; one end of the resistor R2 of the B path is connected with a control interface of the microcontroller, the other end is connected with the base electrode of the triode T2, the B group of light emitting diode groups are connected with the emitting electrode of the triode T2, the collecting electrode of the triode T2 is connected with a +5V direct current power supply, and the other end of the B group of light emitting diode groups is grounded.

In the circuit, the resistance of the resistor R1 is the same as that of the resistor R2, and the model of the triode T1 is the same as that of the triode T2.

The model of the microcontroller is EM78P809 NMJ.

The types of the light emitting diodes in the group a and the group b are different.

The light emitting diodes in the light emitting diode group are connected in parallel or connected in a mode of connecting two light emitting diodes in series and then connecting the two light emitting diodes in parallel.

The utility model provides an electric water heater's display controller circuit has following advantage:

through the operation the utility model discloses a display controller circuit can alternate the background light color of control electric water heater display to make electric water heater's display enough satisfy and light for a long time, with the requirement of the content such as the use data of convenient user reading this electric water heater, can prolong the decay time of this electric water heater display again, can prolong the life of electric water heater display promptly.

Drawings

FIG. 1 shows one embodiment of a display controller circuit of an electric water heater according to the present invention;

fig. 2 shows a second embodiment of the display controller circuit of the electric water heater of the present invention.

Detailed Description

The device of the present invention will be described in further detail with reference to the accompanying drawings and embodiments of the present invention.

Fig. 1 is one embodiment of a display controller circuit of an electric water heater of the present invention, as shown in fig. 1, the circuit mainly includes a Microcontroller (MCU) and A, B two backlight circuits with the same circuit structure; the circuit A comprises a group of light emitting diode groups, a resistor R1 and a triode T1; the B path comprises B groups of light emitting diodes, a resistor R2 and a triode T2. The resistor R1 is connected with a control interface of the microcontroller, the other end of the resistor R1 is connected with the base electrode of the triode T1, the group a of light emitting diodes is connected with the emitting electrode of the triode T1, the collector electrode of the triode T1 is connected with a +5v direct current power supply, and the other end of the group a of light emitting diodes is grounded. The connection mode of the backlight circuit of the path B is similar to that of the path a, and is not described herein again.

In the group a and the group b, each group includes at least one light emitting diode, and the light emitting colors of the light emitting diodes of the group a and the group b are required to be different, and in the worst case, the degree of distinguishing which group of diodes works and distinguishing different colors when the group a or the group b is respectively lighted is also used. For example: the group a consists of red light-emitting diodes and the group b consists of blue light-emitting diodes; or a group a is composed of white light emitting diodes, and a group b is composed of yellow light emitting diodes.

R1 ═ R2, and a typical resistance may be taken to be 1.5k Ω; the transistor T1 is of the same type as T2 and is typically configured as N9013. The model of the microcontroller can be selected as EM78P809 NMJ.

The A path and the B path in the circuit work alternately under the control of the microcontroller, when the A path works, the A group of light emitting diodes are lightened (for example, the red light is emitted), and the B path is disconnected and does not emit light. When the B path works, the B group of light emitting diodes are lighted (for example, the blue light is emitted), and the A path is disconnected and does not emit light.

Fig. 2 is a second embodiment of the display controller circuit of the electric water heater (microcontroller not shown), as shown in fig. 2, the respective light emitting diode groups a and b of A, B two-way circuits can be connected in a mixed manner by the circuit, for example, in the group a, two light emitting diodes can be connected in parallel, and then two light emitting diode groups connected in parallel are connected in parallel, and similarly, the group b also adopts the same circuit structure to build the light emitting diode groups.

The display controller circuit shown in fig. 1 and 2 can be disposed on a circuit board of a display (screen) of the color-interchangeable electric water heater, or can be disposed in the display (screen) in an independent circuit manner, wherein the light emitting diode groups shown in the group a and the group b can adjust the number of the light emitting diodes and the length of the light emitting diode groups according to the size of the area, the length, and the like of the display (screen). When the driving capability is insufficient due to too many LEDs in the group a and the group b or the specification change of the LEDs, the resistors R1 and R2 and the triodes T1 and T2 can be replaced to adjust to adapt to circuit changes.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims

1. A display controller circuit of an electric water heater is characterized in that the circuit mainly comprises:

2. The display controller circuit of claim 1, wherein the resistor R1 and the resistor R2 have the same resistance value, and the transistor T1 and the transistor T2 have the same model.

3. The display controller circuit of claim 1, wherein the microcontroller is of the type EM78P809 NMJ.

4. The display controller circuit of an electric water heater according to claim 1, wherein the led types of the group a and the group b leds are different.

5. The display controller circuit of claim 4, wherein the LEDs in the LED groups are connected in parallel or connected in series two by two and then in parallel.