CN2461183Y - Controller for power of multiple desk of laboratory - Google Patents

Abstract

The laboratory seat power supply controller is a device suitable for centralized control of laboratory power supplies. The controller uses the data input interface circuit as the signal entrance, and its output terminal is connected to the data buffer latch circuit and the address decoding circuit. The address decoding circuit The output terminal is connected to the data buffer latch circuit, the data interface, the level drive circuit, the first-stage relay output circuit, and the second-stage relay output circuit are connected in series in sequence, and the second-stage relay output circuit directly drives the control object. The controller can centrally control the power supply of multiple test benches, and is especially suitable for open laboratories.

Description

Laboratory Seat Power Controller

The utility model is a seat power centralized controller suitable for laboratories, which belongs to the technical field of laboratory control equipment.

The power supply of the laboratory is generally installed above or next to each experimental bench. As long as there is one person in the laboratory doing experiments, the total power supply of the laboratory must be turned on, so the power socket of each experimental bench must have power. Therefore, people who do not need to do experiments and those who have done experiments can still use the power supply freely, which will cause confusion in laboratory management, equipment damage, and even the risk of casualties. The power supply of each test bench in the laboratory is controlled separately, so there are currently several devices that can control the power supply of each test bench separately, such as installing a control device on each test bench, that is, if there are 40 test benches, Just need to install 40 power supply controllers respectively, not only the cost is too high to do like this, but also the workload of maintenance is also big. The other is to install the control unit inside the computer, which has the disadvantage of occupying the resources of the computer; therefore, there is a problem of compatibility and the overall structure of the computer is destroyed.

The purpose of the invention of the utility model is to provide a laboratory seat power controller for the open management of the laboratory, which centrally controls the power supply of a plurality of test benches.

The laboratory seat power controller of the utility model is mainly composed of a data acquisition circuit, a signal processing circuit, and a drive circuit. The controller uses a data input interface circuit as a signal entrance, and its output terminal is connected to a data buffer latch circuit and an address decoding circuit. , the output terminal of the address decoding circuit is connected to the data buffer latch circuit, the data interface, the level drive circuit, the first-stage relay output circuit, and the second-stage relay output circuit are connected in series in sequence, and the second-stage relay output circuit is directly driven control target. The output end of the integrated circuit "U2C" in the address decoding circuit is directly connected to the "E2" end of the integrated circuit "U5" and the "1" end of the integrated circuit "U1". G, 2 G" end.

The address decoding circuit can select the decoding base address XXXH through the jumper, and the main control computer outputs 8bit digital quantities from the parallel port to the base address XXXOH-XXX7H. The 8 groups of addresses are decoded, and the corresponding latches are strobed in turn to output 64 state digital quantities. Each state digital quantity is driven by TTL level to control the opening and closing of the first stage 5VDC relay. The output of the first-level relay is 12V DC level, which is supplied by a high-power DC switching power supply and sent to the second-level relay at the corresponding experimental seat end. The second-stage relay at the seat end is an AC large-load relay, which directly controls the on-off of the 220V power supply of the seat.

The seat power controller is a controller used in the laboratory open management system. After a student enters the laboratory with a legal card, the seat power controller communicates with the computer to receive the student's information and the status information of each equipment in the laboratory, and then assigns a seat number to the student, and automatically turns on the power of the equipment on the seat. Since the seat power controller can automatically assign seats and turn on the power of the equipment, teachers only need to issue legal cards to students who are allowed to enter the laboratory for experiments, and students who are not allowed to experiment do not issue cards, and the laboratory can be unattended. Modern open management can be realized.

The utility model has the advantages of:

1. Low cost and easy to use. Since the utility model adopts a centralized control method instead of a set of controllers for each test bench, the cost of the whole set of equipment is greatly reduced, especially when there are dozens or hundreds of test benches in the laboratory, it can better display The utility model has the advantages of low cost and is more convenient to use.

2. Easy maintenance. The installation of the utility model does not destroy the circuit structure of the original laboratory, and is not only convenient for installation, but also convenient for maintenance.

3. It is convenient for the centralized management of the laboratory. Since the controller is self-contained and does not require computer resources on each seat, the controller is not only suitable for the open management of the computer room, but also suitable for the open management of any laboratory.

4. Safe and reliable: The design of the secondary relay drive output adopts the secondary power supply isolation supply, which avoids the level interference caused by the opening and closing of the subsequent relay, and ensures the reliable operation of the front-end weak current circuit. The sending of 12V control level also provides a safe and effective solution for the centralized control of 64 seat power supplies.

Fig. 1 is the block diagram of circuit principle of the utility model.

Fig. 2 is a schematic circuit diagram of the data input interface circuit 1, the data buffer latch circuit 2, the address decoding circuit 3, and the data interface 4 of the utility model.

Fig. 3 is an electrical schematic diagram of the drive output of the secondary relay of the present invention.

Embodiments of the present utility model are as follows:

Data input interface circuit 1 is mainly "P1", its model is: CON AT62", data buffer latch circuit 2 is mainly integrated circuits U1, U6-U13", the model of integrated circuit U1 is "74LS244", integrated circuit " U6-U13" are all "74LS74". The address decoding circuit (3) is mainly based on integrated circuits "U2, U3, U4, U5". The models of integrated circuits "U3, U4" are "74LS136", and the models of "U5" are "74LS138", "U2" The model number is "74LS00". The level drive circuit 5 is determined according to the number of control objects, that is, the number of seats. Each integrated circuit "ULN2003" has 7 outputs, and each output is respectively connected to the first-stage relay output circuit 6, which is determined by the number of controlled channels of relays J1-Jn . The model of the relay is "RELAY-SPST". The second-stage relay output circuit 7 is controlled by the first-stage relay, and the output of the second-stage relay directly drives Shenyuan. This utility model has just been formed like this.

Claims (2)

1. A laboratory seat power controller, which is composed of a data acquisition circuit, a signal processing circuit, and a drive circuit, is characterized in that the controller uses a data input interface circuit (1) as a signal entrance, and its output terminal is connected to a data buffer latch circuit (2) and address decoding circuit (3), the output terminal of address decoding circuit (3) is connected to data buffer latch circuit (2), data interface (4), level drive circuit (5), first stage relay The output circuit (6) and the second-stage relay output circuit (7) are sequentially connected in series, and the second-stage relay output circuit (7) directly drives the control object (8). 2. The laboratory seat power controller according to claim 1, characterized in that the output end of the integrated circuit "U2C" in the address decoding circuit (3) is directly connected to the "E2" end of the integrated circuit "U5" and the integrated circuit "U1 "1 G, 2 G" end.

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