New applications of BA8206BA4 remote control fan controller

    Abstract: BA8206 BA4 remote control fan dedicated controller has been widely used in various series of fan remote control. However, BA8206 BA4 can also be used in other aspects besides fan remote control. This article introduces the application scheme of BA8206 BA4 in PTC heating fans and household integrated timing and speed controllers, and gives the actual application circuit.

    Keywords: Remote Controller Fan Heater Blower Home Appliances BA8206 BA4

1 Introduction to BA8206 BA4

BA8206 BA4 adopts DIP-18 pin package. Figure 1 is the pin arrangement diagram of the BA8206 BA4 controller. Table 1 is the pin function description of BA8206 BA4. The main characteristic parameters of BA8206 BA4 are as follows:

Table 1 Pin function of BA8206 BA4

●Power supply voltage: -0.3V～6V;

●Input/output voltage: Vss-0.3～VDD+0.3V;

●Power loss: 500mW;

●Working temperature: -10～70℃;

●Storage temperature: -40~125℃.

In addition, BA8206 BA4 also has the following functional features;

●It has three wind speeds: normal wind, natural wind, sleep wind and strong, medium and weak wind;

●With timing mode: can count progressively within 0.5 to 7.5 hours;

●Has a set of non-independent swing head (rotor blade) control functions;

●Built-in buzzer sound: "Bi-BI" for power on, "Bi-" for power off, "Bi" for other operations;

●Using a 455kHz oscillator as the input of the oscillation circuit;

●Adopt stroke starting;

●With memory function: all states before shutting down are memorized, eliminating the trouble of resetting the action mode every time the machine is turned on;

●When used with BA5104 encoder, full-function remote control can be achieved;

●2-digit user code setting;

●When the button is pressed for more than 6 seconds, a Bi-Bi-Bi-Bi warning sound will sound.

2 Working principle of BA8206 BA4

BA8206 BA4 was once the core control component of the Gree remote control system leaf fan. The good operation of nearly 100 yuan of various types of fans has fully confirmed the practicality and reliability of the BA8206 BA4 application circuit. The following is an introduction to its work based on practical circuits. Principle; Figure 2 is the circuit schematic diagram of Gree brand series rotating fans.

The entire circuit is based on BA8206 BA4 (hereinafter referred to as IC1). The power supply part is a commonly used capacitor step-down circuit, which can provide -5V working voltage for the integrated circuit.

In Figure 2, the DI terminal of IC1 pin 1 is connected to an external infrared receiver, which is responsible for receiving signals from the remote control such as shutdown, timing, on/adjustment, wind, rotor remote control, etc. Pin 14 is the positive power terminal, and pin 18 The pin is the negative power terminal.

Pins 2~ of IC1 are respectively program-controlled shutdown, timing, on/speed adjustment, and wind signal input terminals, and form a 4×3 matrix LED function display circuit with pins 6, 7, and 8 to display the fan's position. Working conditions for fair hours, wind types, and wind speeds.

Pin 9 of IC1 is the programmable rotor signal input terminal.

The 10th to 13th pins of IC1 are the high, medium and low speed function output terminals of the rotor and fan motor, and are active at low level.

3 New uses of BA8206 BA4

3.1 Application in PTC heater

BA8206 BA4 is an application IC designed specifically for fans. However, it can still be used in other small household appliances. Of course, some adjustments should be made to BA8206 BA4 at this time. Figure 3 is the circuit schematic diagram of BA8206 BA4 used in PTC heater.

As long as the PTC heater is turned on, no matter what working state it is in, the fan motor must supply air. Dry burning without air will cause thermal deformation and damage to related plastic parts. The way to realize the sum signal at startup is through pins 11 to 13 of IC1 in Figure 3. Three diodes D1, D3, and D5 can be used to form a three-AND gate circuit. Its working principle is: press the work/temperature adjustment key K3, the heater starts and enters the cold air working state, the 13th pin LOW terminal of IC1 outputs low level, and the transistor Q1 is turned on through the D1~D6 branch of the three-AND gate. Q2 is saturated and triggers the thyristor MCR2 to turn on, allowing the fan motor to be powered on and the cold air LED to turn on.

Press the on/temperature adjustment key K3 again, the heater enters the low heat air supply working state, the 13th pin of IC1 returns to high level, the 12th pin MED outputs a low level, and the low level passes through D2 of the three AND gate - The D3-D6 branch maintains the conduction of the thyristor MCR2, that is, maintaining the operation of the fan motor. The other branch reaches the base of the transistor Q3 through the D2 branch of the two-AND gate and turns Q3 on. The relay J1 is energized and closed. When the open contact J1-1 is closed, PTC1 (1200W) is energized for heating, and the low-heat LED is turned on, thereby realizing the low-heat air supply function. At this time, the PTC heater is only equivalent to a 1200W heater.

Press K3 of the on/temperature adjustment button for the third time, the heater enters the high-heat air supply working state, the 12th pin of IC1 returns to high level, and the 1st pin STR terminal outputs low level. The low level is divided into three channels for control. One way maintains the operation of the fan motor through the D5 and D6 branches of the three-AND gate, and all the way maintains the conduction of Q3 through the D4 branch of the two-AND gate, that is, maintaining the pull-in of the relay J1 and the energization of PTC1 (1200W). The third way Directly reaches the base of transistor Q4, causing Q4 to conduct, relay J2 is energized and closed, its normally open contact J2-1 is closed, PTC2 (600W) is energized for heating, and the high-heat light-emitting diode is conductive. At this time, the two sets of PTCs are heated at the same time. Equivalent to an 1800W heater.

Continue to press the on/temperature adjustment button K3, and the heater will cycle through the working mode of cold air - heat generation - high heat -...

Figure 4 is the electrical schematic diagram of the remote control of the rotating fan and the PTC heater. In principle, they can be used interchangeably. The difference is that the PTC heater does not have a wind selection function. Therefore, if you use the fan remote control to control the heater, be careful not to When the wind button is used, the natural wind, which is suddenly large or small, will prevent the PTC from working in the best working condition and affect the heating effect. This is also the key to the wind function of BA8206 BA4 being used in PTC heater applications.

3.2 Multi-purpose comprehensive timing and adjustment controller

Figure 5 is a circuit schematic diagram of a multi-purpose integrated timing and adjustment controller. The fan-specific socket of the controller can not only control the fan in various ways, but also use other sockets to control other household appliances such as TVs. In addition to ordinary sockets and fan-specific sockets, the controller also has dedicated scheduled power-on and power-off sockets. Therefore, a variety of timing control functions can be completed.

(1) Fan dedicated socket XS3

Insert the ordinary three-speed fan into the special fan socket XS3 to achieve nine-speed wind speed, nine-speed natural wind, nine-speed sleep wind, and 0.5 to 7.5 hour scheduled shutdown function.

(2) Dedicated timed power-on socket XS1

(3) Dedicated timer shutdown socket XS2

If the elderly at home have the habit of sleeping while watching TV, and often forget to turn off the TV when they fall asleep, the TV power plug can be inserted into the dedicated timer shutdown socket XS2 to press the dedicated button K2, pin 10 of IC1 SHO The terminal can output low level, 9012 is turned on, the relay is powered on and works, its normally open contact J1-1 is closed, XS2 is connected to the power supply, and you can enjoy TV normally. It is estimated that the elderly will watch TV for about 2 hours before going to bed. You can press the timing button K4 to select 2-hour timing (press 4 times, the "2" indicator light will light up), you can rest assured to rest. After 2 hours, the timing time is up, IC1 pin 2 returns to high level, and 9012 ends , the relay is powered off, its normally open contact J1-1 is disconnected, XS2 is powered off, and the TV is powered off.

4 Conclusion

This article briefly describes three application examples of BA8206 BA4. It is believed that as time goes by, BA series fan controllers will be widely used in the field of small household appliances.