Monitoring power supply manufacturers recommend these special power supplies. Will you buy it?

Monitoring power supply is a kind of power supply which uses modern power electronics technology to control the time ratio of switching tube on and off and keep the output voltage stable. Switching power supply generally consists of pulse width modulation (PWM) control IC and MOSFET. In many places, monitors are needed to monitor people's behavior to prevent crime. The monitor's workload is actually bigger than the security guard's. Security guards have at least a chance to rest and a rest time. When the monitor is installed in one place, it must work all the time without a moment's rest. So sometimes working too long is easy to break down, such as monitoring power outages. Because there are many manufacturers of monitoring power supply, I will introduce you to several good manufacturers of monitoring power supply to let you know this information.

How much is the monitoring power supply?

The price of monitoring power supply is around 300 yuan. Monitor power supply manufacturer

Xi an Guan Jie information technology co., ltd

Product supply: security monitoring power adapter

Product description: input voltage: 220v AC.

Input current: 300 mA max.

Frequency: 50-60 Hz

Output voltage range: 5%

Standby power consumption: max. 3. 1W

Efficiency: in line with V-class Energy Star V2.0

LED indicator: green

Working temperature: 0℃-40℃ for maximum load operation.

Storage temperature: -20℃ to 60℃

Humidity: 5%-95% under non-concentrated conditions.

Mean time between failures: working under the maximum load with the ambient temperature of 25℃

The mean time between failures is 50,000 hours.

(According to MIL-HDBK-2 17 standard)

AC plug: American standard

DC plug: 5.5 mm * 2.1mm *11mm.

Net weight (kg):130g

AC line: None

Dc line: 1m 0.3mm 2.

Overall dimensions: l82mm * w51.5mm * h30mm.

Shenzhen bangmeite technology co., ltd

Product supply: AC24V 12A-9 high-speed ball machine AC24V drive power box monitoring power supply camera centralized distribution box monitoring power box 288w [powtek] two-year warranty.

Product description: Model: PTS-AC24 12A-9CH

Input voltage:100-120 vac/220-240 vac (optional).

Output voltage: 24v AC

Total output current: 12A

Power supply: 288W

Corrugation: not applicable

Efficiency: 70%

Standby power consumption: cooling mode: natural convection

Number of output ports: 9 channels

Maximum output current per channel: 3A

Built-in fuse type: PTC self-recovery

LED indicator of each output port: green

Mainframe main power switch: Yes

Product size: 255*2 10*90

Product weight: 5kg

Warranty period of host: 2 years.

Shenzhen Longquan Rui industry co., ltd

Product supply: Longquan Rui 12V3A switching power supply 12V36W LED monitoring power supply LED power converter monitoring power supply underwater lamp power supply centralized power supply.

Modulation mode: pulse width modulation (PWM)

Transistor connection mode: single-ended type

Work efficiency: 96(%)

Output ripple noise: 0

Output voltage accuracy: 100(%)

Voltage regulation rate: 5(%)

Load adjustment rate: 5(%)

Product certification: ce

Working temperature: -40+60

Type: AC /DC power supply

Frequency range: 50-60HZ

Output current: 3A(A)

Output voltage: 12(V)

Output power: 36(W)

Input voltage: 220 volts

Brand: Longquan Rui

Model: LQR- 12V36W

Processing customization: Yes

Monitoring power supply connection

1. Generally, the power supply of surveillance cameras is 12V and 24V, and some are 5V. The following is an example of 12V. The power supply has seven connections, which are divided into input and output.

2. "Input": the input has three terminals, and the above figure is L, N and ground from left to right respectively. L corresponds to the fire line, n corresponds to the zero line, and three horizontal line icons correspond to the ground line. Three input terminals are commonly used 220V power lines.

3. "Output": the output has four terminals, two negative electrodes and two positive electrodes, two negative electrodes are COM and COM respectively, or some power supplies are marked (COM 1 and COM2), and then the remaining two are positive electrodes +V and+V. ..

4. The live wire, neutral wire and ground wire are commonly used power wires, and the negative electrode and positive electrode are the positive plate and negative electrode of the surveillance camera. General 12V 10A monitoring power supply can supply 10 monitoring cameras. For example, if 10 surveillance cameras are to be connected, the negative poles of the power supply of 10 surveillance cameras are all connected to the negative poles. Similarly, the positive electrode is connected to the positive electrode. Although the positive and negative electrodes are only two terminals, they can be connected together if there are more cameras.

5. If the transformer has an output plug. Cut the output line of transformer 12V, and carefully look at the line mark on the output line. Generally, there are signs, some are dotted lines and solid lines, some are word lines, and then the lines you connect are connected. For example, the output line is red with words, and the other end of the red line should also be connected with words. You don't have to cut the camera line.

Monitor power supply maintenance

1, when we maintain the monitoring power supply, we must first use a multimeter. This instrument is often used in electrical maintenance to detect whether the power components of the monitoring power supply are short-circuited, such as whether the high-power resistor for restraining surge current is burnt out or broken. Then check whether the resistance of each output port is abnormal. If any electronic component is damaged, it can be directly replaced and replaced with a new electronic component.

2. After replacing the replaced electronic components, turn on the power supply to see if the monitoring power supply can work normally. If it doesn't work normally, then check the power factor module and pulse width modulation module to understand the function of these modules and how to make them work normally and carry out professional maintenance.

3. Later, test whether the voltage of some electronic components is within the normal working range, and the voltage range required by each component is different, which requires users to carefully test and observe, and then carry out targeted maintenance if there is any problem. In addition, the oscilloscope should be used to observe whether the waveform at CT end of PWW module presents sawtooth wave or triangle with good linearity, and whether the waveform at output end VO presents relatively orderly narrow pulse signal.

4. When using the monitoring power supply, the resistance will often be damaged or the chip performance will be reduced. When there is no VC after R short circuit, the PWM module will not work normally, and the same type of resistor needs to be replaced. And sometimes, due to peripheral circuit failure, the voltage of 5V at VR terminal becomes 0V, and the PWM module stops working. This means that the external circuit connected to the VR terminal needs to be disconnected, so that VR can work normally when it changes from 0V to 5V.