Power supply technical indicators

Voltage, output current and voltage adjustment range; the other is quality indicators, which reflect the quality of a voltage stabilizer, including stability, equivalent internal resistance (output resistance), ripple voltage and temperature coefficient. There are four main requirements for the performance of a voltage stabilizer:

1. Good stability

When the input voltage Usr (rectified and filtered output voltage) changes within the specified range, the change in the output voltage Usc should be very small, which is generally required.

The degree of output voltage change caused by input voltage change is called stability index, which is usually expressed by voltage regulation coefficient S: the size of S reflects the ability of a voltage regulated power supply to overcome input voltage change. Under the same input voltage change condition, the smaller S is, the smaller the change of output voltage is, and the higher the stability of the power supply is. Usually S is about .

2. Small output resistance

When the load changes (from no load to full load), the output voltage Usc should remain basically unchanged. The performance of the voltage regulated power supply in this aspect can be characterized by the output resistance.

The output resistance (also called equivalent internal resistance) is represented by rn, which is equal to the ratio of the change in output voltage to the change in load current.

rn reflects the ability of the output voltage to maintain a constant value when the load changes. The smaller rn is, the smaller the change in output voltage will be when Ifz changes. For a high-performance voltage-stabilized power supply, the output resistance can be as small as 1 ohm or even 0.01 ohm.

3. Small voltage temperature coefficient

When the ambient temperature changes, it will cause the output voltage to drift. A good voltage-stabilized power supply should effectively suppress the drift of the output voltage when the ambient temperature changes and keep the output voltage stable. The drift of the output voltage is expressed by the temperature coefficient KT:

4. Small output voltage ripple

The so-called ripple voltage refers to the 50 Hz or 100 Hz AC component in the output voltage, usually expressed as an effective value or peak value. After voltage stabilization, the ripple voltage after rectification and filtering can be greatly reduced, and the reduction factor is inversely proportional to the voltage stabilization factor S.

The series voltage regulator circuit introduced in the previous section is used as a simple voltage regulator, which can meet the needs of general radio enthusiasts. However, this power supply still has many "natural" defects. To improve the performance requirements, some improvements must be made. By improving its performance from the following four aspects, it can be made into a voltage regulator with practical value. That is: add amplification links to improve stability and make the output voltage adjustable; use composite tubes as adjustment tubes to increase the output current; add protection circuits to make the power supply work safe and reliable.

PLR microcomputer controlled quantitative compensation type Product model Specification Model PLR-30KZ PLR-50KZ PLR-60KZ PLR-75KZ PLR-100KZ
Rated capacity 30KVA 50KVA 60KVA 75KVA 100KVA
Working mode Microcomputer controlled quantitative compensation type Input Rated voltage 220±20% / 380±20%
Voltage regulation range 176V-----264V / 304V-----456V
Frequency 47Hz-----63Hz
Power factor 0.95------1 Output Frequency same as input frequency

Rated voltage 220V / 380V Load voltage regulation rate ±1%----±4% Waveform distortion rate Additional distortion less than 1% Power factor ±0.95----1 (load power factor applicable range) Reflection time 20mS/Step~40mS/Step Pure inductive coefficient ≥80%
Efficiency ≥98% Protection Automatic power off and LED display when voltage exceeds the regulation range Overload No-fuse circuit breaker Automatic bypass LED indication and alarm Noise elimination Surge absorber, LC heavy load filter, EMI filter circuit

Indication Voltage meter 0~450V meter pointer display Current meter R/S/T each phase load current meter pointer display Power LED display
Abnormal LED display
Overload capacity 150% can be maintained for 10 seconds
Noise suppression Normal mode = 20db/10 Signal frequency: 100Hz Common mode = 20db/10 Signal frequency: 1KHz Normal mode = 14db 10KHz or more
Peak suppression Input peak 3000V pulse width, 2μs output peak: <30V Input peak 4000V pulse width, 2μs output peak: <40V
Noise (1m away from the machine) <45dB
Cooling method Fan forced cooling
Features Adopt three-phase split-modulation technology, natural balance between phases, and suppress three-phase imbalance
Working temperature -10℃~45℃
Relative humidity 0~95% (non-condensing state)
Volume (mm) 850×360×650 850×360×650 900×450×800 900×450×800 900×450×800Weight (KG) 100 126 130 140 160