In daily life and work, panel switches, air switches, leakage protection switches, we often see and use, I believe are very familiar, but when we are on a business trip, staying in a hotel, hotel, we find that the hotel or hotel room entrance wall will have a switch: card power switch! Only by plugging the accommodation card into the switch will the room be powered on! So how much do you know about plug-in card power switches?
Plug-in card power switch is mainly used in hotels and guesthouses. Solve the problem of cutting off the power supply of the room in the vacant state. So as to achieve electricity safety and energy saving.
Instructions for using the plug-in card power switch:
The door card is inserted into the special card power switch, you can use the lighting, TV, air conditioning and other equipment in the room, when the guest leaves the room to take out the room door card (the guest must pull out the card when going out of the room, because the guest needs the room door card to open the door when returning to the room), the total power supply of the room can be automatically delayed within 15 seconds can be powered off, which can save electricity and make the room electricity more safe.
Power supply of plug-in card power switch:
Generally, it is a strong power supply of 220V, using a high-power 30A relay, with a load of 6600W, to meet the power load of hotel rooms; There are illuminated LED blue light indicators on the power switch, which is in line with modern hotel trends and convenient for guests to operate at night.
The composition of the plug-in card power switch:
Generally, the plug-in card power switch is composed of three parts of the circuit: high and low voltage power conversion part, identification card part and output part. Among them, the conversion of power supply is composed of a variety of ways, such as switching power supply type, resistance capacitance step-down type, transformer type, etc. The high and low voltage conversion part will reduce the alternating current to the DC low-voltage power supply through rectification to supply the identification part and the output part The identification card part detects whether the inserted card meets the preset standard, and the output part obtains the standard signal of the identification card part, and turns on the AC power supply (live wire).
Supplement: The plug-in card power switch can be 30A, 40A, etc. according to the different load requirements of the room.
Classification and development history of plug-in card power switch:
1), Mechanical power take-off switch:
An early take-off switch was actually a mechanical rocker switch that turned on the two contacts of the power supply by inserting a key tag. So that when the guest leaves the room, when the key plate is taken out, the contact is disconnected and the power supply of the room is cut off. In-house guests who are familiar with this principle sometimes insert a hard piece like a key tag such as a comb into the switch, which can also take electricity, so it cannot fundamentally solve the safety and energy saving of electricity. It is now almost obsolete.
2), photoelectric switch:
With the advent of magnetic card hotel locks, only a magnetic card is needed to open the door and take electricity, and a photoelectric power switch has appeared. Its principle is to turn on or block a pair of infrared rays through the plug-in card, the control circuit detects the on-off of the infrared rays, and outputs the power on and off through the relay. The power take-off switch of this principle is also called the general-purpose take-off switch. It is currently used by a few hotels.
3), IC card power switch:
It is mainly suitable for taking power through contact IC cards, mainly detecting the chip pins of IC cards, judging whether there is a card inserted and whether it is an IC card inserted to output the power on-off. At present, the proportion of the market is relatively small.
4), Low frequency card power switch:
Suitable for 125KHz non-contact induction card, such as EM, TEMIC, TI and other induction cards, mainly to detect the frequency of the card, whether it meets 125KHz to output the power on-off. At present, the proportion of the market is large.
5), High frequency card power switch:
It is mainly suitable for 13.56MHz high-frequency induction cards, such as MIFARE's S70, S50, and domestic Fudan cards, etc., and outputs the power on and off by identifying whether the ID of such cards meets the standard. At present, there are many applications in the market.
The above 5 types are all types of identification card opening. There is also the identification room number and the identification event type.
6), identify the room number type power switch: is one of the special card special switches, by reading the room address data in the door card, compare whether it is the room card to output the power on-off. It is used by a small number of hotels. Need to share the writing card data with the hotel lock.
7), identify the time-type power switch: it is one of the special switches for special cards, and output the power on and off by reading the room address and time data in the door opening card to compare whether it is a card within the effective time of the room. A small number of hotels use it. Need to share the writing card data with the hotel lock.
The difference between the plug-in card power switch and the ordinary panel switch:
From the principle and composition of the plug-in card switch, it can be seen that the plug-in card switch:
1. Similarities:
1, are relying on the on-off circuit to achieve the purpose of control, and the control is the live wire.
2. The wiring method is basically the same, and the switch controls the fire without controlling zero.
Note: There are generally only two wires inside the ordinary panel switch: live wire in and live wire out, while the card control switch generally has three wires: live wire in, live wire out, zero wire.
2. Differences:
1. The structure is different.
Ordinary switch is just a simple mechanical press on, press up off, plug-in card power switch is automatically identified card system control, the focus is on control, and with relays, rectifier modules, small transformers, etc.
2. The application is different.
General lighting panel switches generally exist alone in the branch control of household electricity, such as; Control one light individually. The plug-in card power switch is generally installed in the trunk control of the room, controlling all the electrical appliances of the hotel, similar to an air switch.
3. The functions are different.
Ordinary household panel switches only have switch functions, while plug-in card power switches have weak current information recognition, power off delay and other functions in addition to switch functions