Electromagnetic lock current is safe and stable

Because the electromagnetic lock uses A/D conversion as the electrical detection, its collected data has a certain accuracy. The five-protection host can read the electrical detection data for display or other purposes.

During use, a certain threshold value can also be set for the analog quantity to convert the analog quantity into remote signal information.

The circuit block diagram of the electrical detection module is shown in Figure 3 e. Power module The input voltage of the power module is 220VAC. An external transformer is used to reduce the voltage to 12-24VDC and input it to the unit controller. The controller divides the output into three groups: +5V, +5V and +15V (-15V).

One of the +5V voltages supplies power to the CAN driver and RS485. The electromagnetic lock uses a low voltage difference DC/DC isolation module with an isolation voltage of 1000V.

The other +5V also performs DC/DC isolation, and supplies power to the CPU and all internal integrated circuits optically isolated low-voltage input/output terminals. After rectification and filtering, +15V (-15V) is directly supplied to the electromagnetic lock drive part. Because the electromagnetic lock unit controller is installed outdoors, the shell is considered to be an iron box. Rubber gaskets are used to seal each interface part to solve the waterproof problem; the external interface uses a rail-type terminal block. The electromagnetic lock unit controller software platform uses the KEILC51 compilation environment, and the program code is written in C language. Considering the characteristics of 89C52 and resource configuration, the software operation structure uses the front/back mode. The interrupt part mainly handles the sending and receiving of CAN messages and the sending and receiving of RS485 bus data. The main loop program is responsible for handling the drive control and data assembly of the device. The electromagnetic lock unit controller of this utility model is to use it in the existing electromagnetic five-defense system. Its function is to complete the control of the on-site electromagnetic lock and the collection of the on-site knife switch position under the control of the five-defense host. This utility model also has some other variations or improvements.

If the technicians in this technical field are inspired by the present invention to make clear and non-substantial changes or improvements, they shall be attributed to the electromagnetic lock of the present invention.