The monitoring power supply is a power supply that uses modern power electronics technology to control the time ratio of the switch on and off to maintain a stable output voltage. The switching power supply is generally composed of a pulse width modulation (PWM) control IC and MOSFET. Monitors are needed in many places to monitor human behavior to prevent crimes. The workload of the monitor is actually greater than the workload of the security guard. The security guard has at least the opportunity to take a break, and the time to adjust the rest. The monitor is always working in one place, and there is no moment to rest. Therefore, sometimes the working time is too long and it is easy to fail, such as monitoring the power supply is broken. Since there are many manufacturers of monitoring power supply , I will introduce a few good monitoring power supply manufacturers so that everyone can understand the information in this regard.
How much is the monitoring power supply
The price of the monitoring power supply is about 300 yuan.
Note: This price is for reference only! Due to different regions, of course, the price will vary. If you want to know more about the relevant price details, please refer to the local dealers!
Monitoring power supply manufacturers
Xi'an Guanjie Information Technology Co., Ltd.
Product supply: power adapter for security monitoring
Product introduction: Input voltage: 220V AC
Input current: Max 300mA
Frequency: 50-60 Hz
Output voltage range: ± 5%
Standby power consumption: maximum 3.1W
Efficiency: Meets the fifth level of Energy Star V2.0
LED indicator: green
Working temperature: 0 ℃ -40 ℃ maximum load working
Storage temperature: -20 ℃ to60 ℃
Humidity: 5% -95% humidity under non-concentrated conditions
Mean time between failures: working at maximum load at 25 ° C ambient temperature
Mean time to failure 50000 hours
(According to MIL-HDBK-217 standard)
Ac plug: US regulations
Dc plug: 5.5mm * 2.1mm * 11mm
Net weight (Kg): 130g
Ac line: None
Dc line: 1 meter 0.3 square millimeters
Dimensions: L82mm * W51.5mm * H30mm
Shenzhen Bangmet Technology Co., Ltd.
Product supply: AC24V12A-9 road high speed dome camera AC 24V drive power box monitoring power supply camera centralized power distribution box monitoring power supply box 288W [POWTEK] two-year warranty
Product introduction: Model: PTS-AC2412A-9CH
Input voltage: 100-120VAC / 220-240VAC (optional)
Output voltage: 24VAC
Total output current: 12A
Power supply power: 288W
Ripple: N / A
Efficiency: 70%
Standby power consumption:
Cooling method: natural convection
Number of output ports: 9 channels
Maximum output current per channel: 3A
Built-in insurance tube type: PTC self-recovery
LED indicator of each output port: green
Host main power switch: Yes
Product size: 255 * 210 * 90
Product weight: 5kg
Host warranty period: 2 years
Shenzhen Longquanrui Industrial Co., Ltd.
Product supply: Longquan Rui 12V3A switching power supply 12V36W power supply LED monitoring power supply LED power converter monitoring power supply underwater power supply centralized power supply
Modulation method: pulse width modulation (PWM)
Transistor connection: single-ended
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 (V)
Brand: Longquan Rui
Model: LQR-12V36W
Custom processing: Yes
Monitoring power connection
1. The power supply of the general surveillance camera is 12V and 24V, there are also 5V, the following is 12V as an example, the power supply has 7 wiring places, divided into input and output.
2. "Input": The input has three binding posts, which are L, N, and ground from left to right in the above figure. "L corresponds to the live line, N corresponds to the zero line, and the three horizontal icons correspond to the ground line." The three input terminals are the commonly used 220V power cord.
3. "Output": The output has four terminals, which are two negative poles and two positive poles, two are negative poles for COM, COM or some power supplies are marked (COM1, COM2), and the remaining two are positive poles + V, + V.
4. The live wire, neutral wire, and ground wire are the commonly used power cord access, and the negative and positive poles are the positive and negative poles of the surveillance camera. Generally, the 12V10A monitoring power supply can supply 10 monitoring cameras. For example, if 10 monitoring cameras are to be connected, then the negative poles of the 10 monitoring cameras are connected to the negative side. The positive electrode is also connected to the positive electrode. Although the positive and negative poles are just two terminals, they can be connected together if there are many cameras.
5. If the transformer has an output connector. Cut the 12V output line of the transformer, and carefully look at the line marking on the output line. Generally, there are signs, some are dashed lines plus solid lines, and some are word plus lines. Then the line you connect corresponds to the connection. The word, the other end of the red should also be attached to the word. It is not necessary to cut the camera line.
Monitor power repair
1. When we repair the monitoring power supply, we must first use a multimeter. This meter is often used in the maintenance of electrical appliances. It is used to detect whether the power components of the monitoring power supply have broken down and shorted, such as suppressing waves Is the high-power resistor of the inrush current burnt out? Then check whether the resistance of each output port is abnormal. If any of the electronic components is damaged, you can replace it directly with a new electronic component.
2. After replacing the replaced electronic components, turn on the power supply and see if the monitoring power supply can work normally. If it still can't work normally, then check the power factor module and pulse width Modulation components, find out the functions of these modules and how to make them work normally, and carry out professional maintenance.
3. After that, check whether the voltage of some of the electronic components is within the normal working range. The range of the voltage required by each component is different. This requires the user to carefully check, observe, and Then carry out targeted maintenance. In addition, it is necessary to use an oscilloscope to observe whether the waveform at the CT end of the PWW module exhibits a sawtooth wave or triangle with good linearity. In addition, it also depends on whether the waveform at the output end VO exhibits a more Sequential narrow pulse signal.
4. When using the monitoring power supply, it is often encountered that the resistance is damaged or the performance of the chip is reduced. When R is short-circuited and there is no VC, the PWM component will not be able to work normally. At this time, the same type needs to be replaced. The resistance. In addition, due to the failure of the peripheral circuit, the 5V voltage of the VR terminal becomes 0V, and the PWM component also stops working. This requires that the external circuit connected to the VR terminal be disconnected to change the VR from 0V When it becomes a normal 5V, it can work normally.
Editor's summary: Sometimes a small monitor can record the criminal's crime, helping the police arrest the real murderer. In an era when technology was not so developed, many real criminals were able to escape by lack of conclusive evidence, but many innocent people were wronged. Therefore, a monitor should be installed in a commercial center or residential area with a large population of people entering or leaving, otherwise criminals can easily take advantage of it.
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