Traditional Culture Encyclopedia - Hotel accommodation - What is the principle of hotel card accessing electricity?
What is the principle of hotel card accessing electricity?
Plug-in card power switch, also known as power switch, energy-saving switch, energy-saving switch. Mainly used in hotels and guesthouses. When the room is vacant, cut off the power supply to the room. So as to realize electricity safety and energy saving.
First, the circuit principle
Card power switch is generally composed of high and low voltage power conversion part, identification card part and output part. Among them, there are many ways to convert power supply, such as switching power supply, resistance-capacitance step-down, transformer and so on.
The high-low voltage conversion part reduces alternating current to DC low-voltage power supply through rectification and provides it to the identification part and the output part.
The identification card part detects whether the inserted card meets the preset standard.
The output part gets the standard signal of the identification card part and turns on the AC power supply (live wire). According to different load requirements, this part includes 30A, 40A, etc.
Second, the development process
The development process of power take-off switch is synchronous with hotel lock, because it needs a door-opening card to get power, so the power take-off switch must match the type of door-opening card of hotel lock.
1, mechanical power take-off switch: The early power take-off switch is actually a mechanical rocker switch, which connects two contacts of the power supply by inserting a key card. In this way, when the guest leaves the room, the contacts are disconnected, the power supply of the room is cut off, and the key card is taken out. Hotel guests who are familiar with this principle can sometimes get electricity by inserting a hard object like a key card, such as a comb, so the safety and energy saving of electricity cannot be fundamentally solved. It has almost been eliminated at present.
2. Photoelectric power switch: With the appearance of magnetic card hotel lock, only one magnetic card is needed to open the door to get electricity, and the photoelectric power switch appears. Its principle is that a pair of infrared rays are turned on or off through the card, and the control circuit detects the turn-on and turn-off of infrared rays, and outputs power through the relay. The power switch of this principle is also called universal power switch. There are still a few hotels using it.
3.IC card power switch: it is mainly suitable for power supply through contact IC card, mainly to detect the chip pin of IC card and judge whether the card is inserted or not, and whether the IC card is inserted into the output power supply. At present, the market share is also relatively small.
4. Low-frequency card power switch: It is suitable for 125KHz contactless induction cards, such as EM, TEMIC, TI and other induction cards, and mainly detects whether the card frequency meets the 125KHz output power supply. At present, the market share is relatively large.
5. High-frequency card power switch: it is mainly suitable for 13.56MHz high-frequency induction cards, such as S70 and S50 of MIFARE and Fudan card made in China. , and output power by identifying whether the ID of these cards meets the standard. It is widely used in the market at present.
The above five types are all used to identify the types of door opening cards.
6. Identify the room number type power switch: it is one of the special switches for special cards. By reading the room address data in the door-opening card, it is compared whether it is the card output power supply of this room. A few hotels use it. You need to share the card data with the hotel lock.
7. Identify the time-base power switch: it is one of the special switches for special cards. It outputs power by reading the room address and time data in the door-opening card, and compares whether it is a card within the valid time of the room. A few hotels use it. You need to share the card data with the hotel lock.
8. Network-type power switch: By reading the data such as the permission type and time of the door opening card, it is uploaded to the guest control system, and the guest control system executes the power consumption status of the guest room. High-star hotels use it more. Need to share card data and transmission protocol with hotel lock and guest control system.
Social welfare
The hotel uses a door-opening card to get electricity. When the guest leaves the room, he takes the door opening card (the guest must pull it out, because the guest will come back with this card to open the door), and the power-saving switch will automatically cut off the power supply of the hotel after delaying for 20 seconds, which will not only bring direct economic benefits to the hotel (save a lot of electricity bills), prolong the service life of electrical appliances in the room, improve the safety factor of electricity consumption in the room, but also effectively realize the minimization of energy saving and investment cost of the hotel and achieve the effect of "energy saving and emission reduction" of the hotel.
Electrical safety
If the guests go out without turning off the hotel's electrical appliances and the waiter doesn't notice the guests go out, the hotel's electrical appliances will work for a long time. Long-term operation of electrical appliances will lead to heating of the electrical appliances themselves. If the electrical appliance is overheated, it will shorten its service life or burn it out, and even cause a fire alarm.
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