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LED drive power Information

LED drive power you know how much?

■ Input voltage range

Users see marking on the power supply input voltage range of 85-265VAC and the actual use of time is 100-240VAC, in fact, at the time of the certification, it will be called tightening of ± 10% test (IEC60950 tightened + 6% - 10%), so the power supply voltage range of specifications defined in the use is not a problem; and it is marked on the power supply to meet safety standards, and to ensure that users can correct input power.

■ Power factor (PFC)

PFC (Power Factor Correction) power factor correction, mainly to improve the power supply input side effective power and apparent power ratio. Usually without PFC circuit models, the input power factor of only 0.4 to 0.6, and has active PFC circuit can reach above 0.95, the correlation formula is as follows:

Apparent power = input voltage × input current (VA)

Effective power = input voltage × input current × power factor (W)

Environmental protection point of view: the power company power plants must produce more than apparent power of electricity, the generators can supply stable electricity market demand, and the actual use of electricity is the effective power. If the power factor of 0.5, indicating that emit more than 2VA power generators to supply power 1W security needs, its energy poor operational effectiveness. Conversely, if the power factor is improved to 0.95, the power generator sets as long as the company issued more than 1.06VA power supply 1W energy demand would have no issues, operational efficiency energy preferred.

■ Protection

Over-voltage / over-current / overload / over-temperature fault protection refers to the change in power supply due to input power, load, environment, cooling circuit or device failure and other internal and external conditions which threaten the security of supply, resulting in the power supply does not work, the power supply correlation function is activated circuit protection action occurs.

OVP: Overvoltage Protection (Over Voltage Protection). Characteristics of a switching power supply circuit, the protection of the switching power supply and the load at the output appear abnormally high voltage.

Voltage protection: When the protected circuit voltage falls below a certain value, the protector off the line; when the supply voltage returns to the normal range, the protection is automatically turned on.

OCP: overcurrent protection (Over Current Protection). DC switching power supply circuit in order to protect the regulator is not burned in a short circuit, the current increases. The basic approach is, when the output current exceeds a certain value, the regulator is in a reverse bias state, thereby turning off, current is automatically cut off the circuit.

Short circuit protection Short Circuit Protection: limit the power switch at the time of the short-circuit output current to a safe value of the switching power supply to protect against damage.

OTP:. Overheat protection circuit (Over Temperature Protection DC switching power supply switching regulator high integration and small size, light weight, making the power density within the volume of the unit is greatly improved, so if the power supply inside the device components of its work ambient temperature requirements without a corresponding increase, is bound to make the circuit performance deterioration, premature failure of components. Therefore, high-power DC switching power supply should be located overheat protection circuit.

Protection (action) in the following ways:

1. Restart (after disconnecting the power supply is turned on again, the power is back to normal sub-automatic and manual.);

2. hiccup (hiccup: intermittent output);

3. Fold back limiting (when the load approaches short circuit can be linearly reduce output current to the normal method);

4. limiting (Constant current lim or said constant current, which limits the output current is not due to overload or short circuit load and grow indefinitely, even if the load short-circuit condition does not cause damage to equipment downtime and power).

5. downtime overcurrent / overload / over voltage / over-temperature fault, usually dangerous state protection threshold output current / power / (or input) voltage and the heat sink temperature exceeds the power rating or more.

■ inrush current

Switching power supply input power transmission at the moment appears a brief (1/2 to 1 power cycle, EX: 60Hz Power 1/120 to 1/60 seconds) of high-current (depending on the product design is about 20 ~ 60A Please refer to the product specifications), power will be restored to normal after the product current input, each input of the power to send instant power to appear, this is normal, and will not cause damage to the power supply. But it is not recommended for continuous power supply power on / off. Also should be noted that if you use more than one power supply with power on time, it may cause the power distribution system protection switch tripping operation, it is recommended between multiple power supplies delay boot, or use the power of the remote control function product order delay boot.

■ Output voltage accuracy

Output voltage accuracy is the actual output voltage and rated output voltage difference, the error is stability and stability of the load line superimposed values. This parameter is usually within +/- 1% line regulation means that when the change between the minimum and maximum allowed input voltage range, the output voltage deviation percentage of the nominal voltage. Load regulation refers to when the output load current allowable range between the maximum and minimum changes, the output voltage deviation percentage of the nominal voltage.

Why the constant current power source LED lamps?

LED life is the time that occurred bad light, due to the constant-current drive control of the LED current to ensure that the LED chip junction temperature is not too high, preventing the semiconductor chip, packaging materials, abnormal aging fluorescent material. LED luminous intensity would not decrease too fast (ie, the light fades). Other types of power because they can not control the LED current is constant, because the temperature rise is not easy to control, resulting in a bad light occurs.

Luminous intensity is proportional to the size of the LED current, thus, require a constant current LED driver power supply output characteristics, to ensure that LED can be obtained in the course of steady luminous intensity and manufacturers to ensure long life. In order to ensure constant current power supply constant current drive LED, the LED must be connected in series, in order to ensure that the current of each LED within the circuit are equal and constant. When the power demand for LED lamps is bigger than ever, more and more on the number of LED in series, proportional to the number of series voltage requirements, the resulting voltage is getting higher security can easily go wrong, manufacture and use requirements would be more stringent , which will increase power costs and difficult to use. Therefore, high-power LED driver appeared low voltage drive requirements.

CV + CC power can work in constant voltage, constant current may be working on.

■ IP rating

IPXY dust and waterproof rating

Dustproof (X represents)

Waterproof grade (Y represents)

0. There is no protection

1. prevent large solid invasive (> 50mm)

2. To prevent the intrusion of solid medium-sized (> 12mm)

3. To prevent intrusion into the small solid (> 2.5mm)

4. Prevention of solid objects greater than 1mm into the

5. Prevent harmful dust accumulation

6. completely prevent dust entering

0. There is no protection

1. water droplets trickle to the housing no effect

2. When the housing is tilted to 15 degrees, the water droplets fall to the housing no effect

3. No water or rain water from 60 degrees corner to the impact of the housing

4. no harm of any liquid spilled from the direction of the housing

5. Rinse with water without any harm (12.5 liters / min)

6. Rinse with plenty of water without any harm (100 liters / min)

7. resistance to water immersion within a short time (30 minutes, 1 meter from the surface)

8. prolonged immersion under certain pressure, test time and conditions defined by the manufacturer and the purchaser.

* IP64-IP66 grade models, suitable for indoor or outdoor environment and wet with rain shelter on the premises, practical restrictions related to the installation requirements, refer to the definition of the IP test rating

* IP64 rating above models, suitable for indoor or outdoor wet the occasion.

* IP67 product and can not be placed in water for a long time

Efficiency Efficiency: the total output power ratio expressed as a percentage of the active input power. Namely: Efficiency = output power / input power * 100%.

Rated Power: the power supply maximum output power (the product of the voltage V and current A).

EMC: Electromagnetic compatibility (EMC) refers to requirements to run does not produce electromagnetic interference can not stand on its environment to any device or system complies with the capabilities of the device in its electromagnetic environment. EMC including EMI (electromagnetic interference) and EMS (electromagnetic tolerance) two sectors, so-called EMI electromagnetic interference, switching power harmful energy conduction or radiation. The EMS refers to the process of switching power supply in the implementation of proper function of the surrounding environment from electromagnetic capabilities.

Ripple: since the DC stable power supply is normally provided by the rectified AC voltage and other aspects of the formation, which inevitably DC stabilizing amount of number with some exchange components, such superimposed on the AC component of the DC stabilizing amount it is called ripple.

Output ripple and noise Ripple and Noise, Output: within a specified bandwidth, switching power supply output AC voltage magnitude, usually expressed in peak to peak or RMS millivolt.

THD: Total Harmonic Distortion, referred THD. Refers to the input signal source, the output signal (octave and harmonic component) more than the input signal additional harmonics, which are generally expressed as a percentage. In general, total harmonic distortion at a minimum frequency of 1000Hz, so many products are the frequency distortion as its index. So when testing total harmonic distortion, the sound is emitted 1000Hz is detected, this value is as small as possible.

Overshoot (Over shoot) and undershoot (Under shoot): Overshoot is the first peak or valley value exceeds the set voltage - refers to the highest voltage rising and falling edge refers to the minimum voltage. Undershoot refers to the next valley or peak value. It can cause excessive overshoot protection diodes work, leading to premature failure. Excessive undershoot can cause false clock or data errors.

Operating ambient temperature Temperature, Operating Ambient: switching power supply electrical specifications and reasonable stability of working temperature range. Unless required to do so, do not think that the switching power supply in the entire temperature range can output full power, nor that the switching power supply in the entire operating temperature range can maintain the same electrical specifications.

PWM: Pulse Width Modulation (Pluse Width Modulation): A switching power supply voltage adjustment method used, refers to only by changing the pulse width control output sequence.

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