It is 1.40V).
2. High current charging (1) Working principle Connect to the power supply, the power indicator LED (VD2) lights up. Insert the battery (refer to the picture, actually lead to the battery box, the battery is installed in the battery box), when the battery voltage is lower than Vref, IC1-1 output low level, VT1 is turned on, output large current to the battery Charging. At this time, VT1 is in an amplified state - this is because the sum of the battery voltage and the -VD4 voltage drop is about 3.2V (assuming that the battery voltage is about 2.5V when charging starts), and the voltage after VD1 is about 5.OV, so VT1 The emitter-collector voltage difference is much larger than 0.2V. When the charging current is 300mA, VT1 heat is more serious. Therefore, it is better to use S8550 with PT=625mW, or increase the base resistance to reduce the charging current. Because the LM324 low-level drive capability is small, the measured IC1-2, IC1-4 output low level is not 0V, but is about 0.8V).
(2) The indication of charging firstly looks at the working condition of IC1-3: its non-inverting terminal 1O pin is connected to Vref through R13, R14 is connected to positive feedback, the inverting terminal 9 is externally connected to the capacitor, and has a negative feedback path, so it actually constitutes The hysteresis comparator. At the beginning, there is no voltage at the upper end of C2, and IC1-3 outputs a high level. This high level has two discharge paths. One path is fed back to pin 10 through R14, and the other path charges capacitor C2 via resistor R15. When the charging voltage is higher than the 10-pin voltage V+, the comparator flips the output low. At the same time, due to the feedback effect of R14, the 10-pin voltage immediately jumps to V-. At this time, the capacitor C2 is discharged through the resistor R15. When the discharge voltage is less than the 10-pin voltage V-, the comparator flips the output again. Level, due to the feedback effect of R14, the 10-pin voltage immediately jumps to V+, after which the circuit repeats the above process. Therefore, the output of IC1-3 is a square wave signal with a fixed frequency.
Secondly, look at the working condition of IC1-4: the battery voltage is divided by R2 and R16, and connected to 12 feet of IC1-4, because R2 < obviously it is lower than the voltage of its l3 pin, therefore, IC1-4 output is stable low level. Combined with the above discussion, we can see that the R12 and VD 3 paths are fixed at a fixed square wave voltage and the other end is a stable low level. Therefore, the LED VD3 will periodically illuminate, giving a flash. A flash of feeling.
Finally, look at the working condition of IC1-1: When IC1-2 outputs low level, it is obvious that pin 3 of IC1-1 is low level, and its 2 pin is connected to Vref through R1, so IC1-1 also outputs low level. Combined with the above discussion, we can see that the voltage difference between R11 and VD5 is zero, so VD5 (saturation indication) can not be lit!
In addition, since IC1-1 outputs a low level, no matter how the voltage of pin 9 of IC1-3 changes (capacitor charge and discharge form a triangular wave voltage at this pin), it will not be affected by IC1-1 output? Because IC1-3 9 The pin voltage (either high to V+ or low to V-) is always higher than the output of IC1-1, and VD6 is reverse biased off! Therefore, in this state, the operation of the three indicators is: VD2 is lit, indicating The power is normal; VD3 flashes to indicate that the battery is charging properly; VD5 is not lit.
Supermarket Lighting Led Driver
Supermarket Lighting Led Driver
For Supermarket lightigs, there are various kinds led lights that can apply to supermarket. Our Constant Current LED Lighting Power Supply range offers currents from 100mA to 2000mA; LED lighting power supply high distance lights driver offer high efficiencies, PFC, are available with Class P Input; IP ratings against dust and moisture from IP20 through to IP67 and protection for short circuit, over voltage, overload and over temperature conditions. With additional options such adjustable outputs and PWM, 1-10V, Resistive or triac dimming functions.
Specifically for supermarket light, like the panel light and led tube for long time to used it, flicker free driver with high PF Value, led spotlights driver over voltage protection, short circuit protection, open circuit protection. SELV satety output design.Because the supermarket 24 hours to use, so the power supply life requirements are high, are generally 50,000 hours, at least 5 years warranty.
Parameter:
Input voltage: 100-277vac / 100-240vac / 100-130vac / 180-240vac / 100-347V
output voltage: 25-40vdc / 27-42vdc / 35-45vdc / 50-70vdc / 12Vdc / 24vdc
current: 100mA-8000mA.
Power factor: >0.9
Dimming:0-10V / PWM / RX / DALI.
>=50000hours, 3-5 years warranty.
certificate: UL CE FCC TUV SAA ect.
What's the benefits of Fahold Driver?
- Standard Linear Lighting
- Cost-effective led driver solution for industry,commercial and other applications
- Good quality of light driver with high Efficiency output to meet different requirements
- Easy to order and install,requiring less time,reducing packaging waste and complexity
- Flexible solution
FAQ:
Q 1:Are you a factory or a trading company?
Answer: We are a factory.
Q 2: Payment term?
Answer: 30% TT deposit + 70% TT before shipment,50% TT deposit + 50% LC balance, Flexible payment
can be negotiated.
Q 3: What's the main business of Fahold?
Answer: Fahold focused on LED controllers and dimmers from 2010. We have 28 engineers who dedicated themselves to researching and developing LED controlling and dimming system.
Q 4: What Fahold will do if we have problems after receiving your products?
Answer: Our products have been strictly inspected before shipping. Once you receive the products you are not satisfied, please feel free to contact us in time, we will do our best to solve any of your problems with our good after-sale service.
High Distance Lights Driver,Led Spotlights Driver,Supermarket Lighting Led Driver
ShenZhen Fahold Electronic Limited , https://www.fahold.net