What can be used to replace the room card in the hotel to obtain electricity?

When staying out, whether it is a small hotel that costs thirty or fifty yuan a night, or a large hotel that costs several thousand yuan a night, at the door of each room, there is a small box the size of a switch. It says "Insert card to get power". In addition to the room card, can we insert other cards? What exactly is the principle behind this kind of plug-in card taking power?

Hotel induction room card power card

As can be seen from the three terminals, the working principle of this switch is to control the room power supply by controlling the on and off of the live wire. .

In fact, the card power switch has the following forms:

1. Photoelectric type: Generally, this kind of switch will have a red indicator light on the casing. The principle of this switch is to emit a light beam inside the switch. When the light beam is blocked (by inserting a card), the internal circuit is closed, thereby powering the electrical appliances in the room. This kind of switch can be turned on by inserting any object that can block the light beam (such as a bank card, ID card, membership card or cardboard and other small opaque cards that are similar in size to the room card) and realize the control of the room. After the person leaves the room, the room will still be powered as long as the small card is not pulled out. This switch has been gradually phased out.

2. Contact IC card type: An IC chip card identification device is installed inside the switch, and it senses whether a room card is inserted by contacting the metal chip on the room card. If the identification is correct, power supply will start.

This kind of switch is improved on the basis of photoelectric switch. But it is not perfect. After using it for a period of time, it is easy for the room card chip to fall off and the sensor device to malfunction. Later maintenance costs are higher and they are slowly being eliminated. At first, it was widely used in chain-type express hotels, guesthouses, etc.

3. Radio frequency type: It can be divided into low-frequency card and high-frequency card, also known as proximity card hotel power switch. It judges whether the room card is correct by turning on and off the internal sensor and identifying the frequency of the room card. This kind of card has a smooth appearance, is not easily damaged, and has low maintenance costs. And you can customize the card with the exclusive frequency of your hotel to avoid the situation where any proximity card can draw power. It is currently the most popular identification form of power switch on the market.

4. Special type - the principle is similar to the radio frequency type, except that during the recognition process, this card switch not only reads the card frequency, but also reads the room number and other information inside the card. This kind of card is more private, but due to its many functions, the internal structure is complex and the cost is high. Therefore, it is generally used in relatively high-end hotels or office buildings.

So, after the power switch successfully identifies the card, how to proceed to the next step?

Inside the power switch, there is an integrated circuit board with a key component for controlling power - a micro relay. When the switch successfully recognizes the card, it automatically transmits the signal to the micro switch. After the micro switch is turned on, the relay coil is energized, the relay is closed, and power supply starts. After the card is pulled out, the micro switch is disconnected, the contactor coil loses power, and the room loses power.

To sum up: When you insert something other than a room card into the power switch and cannot get power, you can go to the hotel front desk to apply for a room card or power card to allow people to temporarily go out. , so that the electrical appliances in the room can still work normally.