The double-pole double-throw switch may not be familiar to everyone, because it is not common in our daily life. Then, the following small series will introduce you to the double-pole double-throw switch.

1, what is a double-pole double-throw switch?

Double-pole double-throw switch, as its name implies, has two movable conductive breaker blades. Two breaker blades are connected with a power supply; When the breaker blade is cut to the upper end and connected with the static blade, power is supplied to it, and at this time, the lower static blade has no power. When the stator blade cut to the lower end of the breaker blade is turned on, the power supply is provided in this way, while the upper stator blade has no power supply. This usage is that one power supply supplies power to two power lines at different times. Another usage is that the breaker blades are connected to the power supply side line, the upper and lower static blades are connected to two power supplies respectively, and the two power supplies are connected to different static blades to supply power to a line.

2. Natural map

3. There are six terminals, namely 1.2.3 and 4.5.6, of which 2 and 4 are male terminals.

4. Several circuit diagrams

5. Practical application circuit

Double-pole double-throw switch (DPDT) is a kind of coaxial switch, which is code-named #P#T according to the number of interfaces. There are also single-pole single-throw switches (SPST), single-pole double-throw switches (SPDT) and single-pole six-throw switches (SP6T).

The devices that make up the coaxial switch are ferrite, PIN tube, FET or BJT. Ferrite and PIN are classic switching devices. Table 1 shows the performance comparison of the two devices. Ferrite is characterized by high power and low loss, and PIN is characterized by high speed and low cost. Field effect transistor or BJT has gain and has become the main device of small and medium power switch. Coaxial switches of various devices have their own applications.

The above is the content of the double-pole double-throw switch introduced by Bian Xiao, hoping to help you. For more information about the double-pole double-throw switch, please continue to pay attention to the renovation of Tuba Rabbit School.

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