There are two kinds of changes in voltage and current through the wire. We call this "common mode" and "differential mode". The power line of the device, the communication line of the telephone, etc., and the communication line exchanged with other equipment or peripheral equipment have at least two wires, and the two wires transmit power or signals as a round-trip line. But there is usually a third conductor outside the two wires, which is the "ground". There are two types of interference voltage and current: one is that two wires are respectively transmitted as round-trip lines; the other is that two wires are used as paths, and the ground wires are used for return path transmission. The former is called "differential mode" and the latter is called "common mode". For differential amplifiers, the interference signals of the two inputs are differential mode interference signals if they are not equal in size or in different directions.
Usually, the electrical appliances we use are two wires, one fire wire (L) and one neutral wire (N). The neutral wire is considered to be the neutral wire of the three-phase electricity, and there is also a ground wire called the ground wire. The interference between the neutral line and the live line is called differential mode interference, and the interference between the live line and the ground line is called common mode interference. There is no voltage between the ground and the neutral line, or it can be considered that the zero line has no voltage and cannot drive the electric appliance. Therefore, there is no interference between the neutral line and the ground line.
What is the common mode residual voltage? What is the common mode residual voltage?Common mode voltage: The average of the phasor voltages that occur between each conductor and the specified reference point (often earth or frame). Or the part of the input voltage that is applied between the two measuring ends of the voltmeter and the specified common terminal.
Symmetrical voltage: The voltage between any two of a given set of live conductors. The differential mode voltage is also called a symmetrical voltage.
In the specified waveform, the nominal discharge current impacts the zinc oxide valve plate, and the voltage peak measured across the valve plate is called the residual pressure. The ratio of residual pressure to varistor voltage, residual voltage ratio. Lightning strikes, lightning will generate instantaneous high voltage and high current on the input/output power line, which will affect the stable operation of the user equipment and cause equipment damage in severe cases. The arrester can be divided into two types: common mode connection and differential mode connection: the arrester is connected between the phase lines or between the phase line and the neutral line, which is called differential mode connection, so-called lateral protection. The arrester is connected between the phase line and the ground line or between the neutral line and the ground line. This is called the common mode connection, so-called vertical protection.
Common mode signal
Common-Mode Signals
The common mode signal is the same signal that acts on the inphase and inverting inputs of the differential amplifier or instrumentation amplifier. For example, a balanced pair of noise voltages introduced into the two balanced ends. Another example is the DC voltage applied to the balance line (for example, the DC level due to the ground potential difference between the signal source and the receiver).
For an ideal differential amplifier, the common-mode signal output can be completely eliminated because the differential inputs (in-phase and in-phase) cancel out the same input components. The parameter that measures this characteristic is called the common mode rejection ratio or CMRR.
Introduction
Common mode voltage: The average of the phasor voltages that occur between each conductor and the specified reference point (often earth or frame). Or the part of the input voltage that is applied between the two measuring ends of the voltmeter and the specified common terminal.
form
"Common mode" and "differential mode" are two forms in which changes in voltage and current are transmitted through a wire.
There are two types of interference voltage and current: one is that two wires are respectively transmitted as round-trip lines; the other is that two wires are used as paths, and the ground wires are used for return path transmission. The former is called "differential mode" and the latter is called "common mode".
Power line noise is caused by electromagnetic disturbances generated by various electrical equipment in the power grid along the power line. Power line noise is divided into two categories: common mode interference and differential mode interference. Common-mode interference is defined as the undesired potential difference between any current-carrying conductor and the reference ground; differential-mode interference is defined as the undesirable between any two current-carrying conductors. Some potential differences.
Conducted interference signals on any power line can be represented by differential and common mode signals. Differential mode interference is transmitted between two wires, which is a symmetrical interference; common mode interference is transmitted between the wire and the ground (the chassis), which is an asymmetrical interference. Under normal circumstances, the differential mode interference is small, the frequency is low, and the interference caused is small; the common mode interference amplitude is large, the frequency is high, and the radiation can be generated by the wire, and the interference caused by the interference is large.
Common mode interference: Generally refers to noise with equal amplitude and phase at the same on two signal lines.
What is common mode interference and differential mode interference?There are two kinds of changes in voltage and current through the wire. We call this "common mode" and "differential mode". The power line of the device, the communication line of the telephone, etc., and the communication line exchanged with other equipment or peripheral equipment have at least two wires, and the two wires transmit power or signals as a round-trip line. But there is usually a third conductor outside the two wires, which is the "ground". There are two types of interference voltage and current: one is that two wires are respectively transmitted as round-trip lines; the other is that two wires are used as paths, and the ground wires are used for return path transmission. The former is called "differential mode" and the latter is called "common mode".
Common mode interference is transmitted between the signal line and ground, and is an asymmetrical interference. Methods to eliminate common mode interference include:
(1) Use shielded twisted pair and effectively ground
(2) Where a strong electric field is to be considered, galvanized pipe shielding
(3) Keep away from high-voltage lines when wiring, and do not bundle high-voltage power lines and signal lines together.
(4) Do not share the same power supply with the electronic lock
(5) Adopt linear regulated power supply or high quality switching power supply (ripple interference is less than 50mV)
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