How does an electrical fence work?
The A1 terminal output +5KV of the electronic fence host PCBA is connected to the front end alloy wire through the high voltage line, and the front end alloy wire jumper is used to make the second and fourth wires on the front end alloy wire form an equipotential, and then return to the fence host A2 terminal. The A2 terminal is connected to the return voltage value detection circuit inside the fence host (the proposed return voltage value is not lower than +5KV for normal status). When the front end of the fence is not damaged or malfunctions, the output voltage of +5KV from the A1 terminal is transmitted back to the A2 terminal through the front-end alloy wire equipotential transmission. The voltage detected by the A2 terminal is not lower than +5KV, and the fence host does nothing. Call the police.
When the alloy wire at the front end of the electronic fence is broken, the +5KV voltage output by the A1 terminal cannot be returned to the A2 terminal through the 4th and 2nd wires. At this time, the detection circuit of the A2 terminal cannot detect any voltage value, which is about 0V. Then the fence host sends a disconnection alarm;
When PCBA is short-circuited, the voltages of A1 and A2 will both be pulled down to about 0V
When the alloy wire at the front end of the electronic fence is damaged or malfunctions, causing the alloy wire connected to the A1 terminal to collide with the adjacent alloy wire or the voltage test base point, causing a short circuit of the PCBA, the +5KV output from the A1 terminal is caused by the increase in the current value. Decrease, so that the voltage value returned to the A2 terminal is about 0V, and the A1 terminal changes to a voltage higher than 0V and lower than +5KV according to the alloy wire and short-circuit conditions, and the fence host sends a short-circuit alarm.
The working principle of the high-voltage circuit between the B1 and B2 terminals is the same as that of the high-voltage circuit between the A1 and A2 terminals, but the polarity is opposite. Because the built-in two sets of high-voltage power supplies are connected in series, all A1, A2 and B1 The voltage value between terminals B2 and B2 is a single group voltage value×2.
