car cigar lighter to usb power socket circuit

Description: A USB port is capable of supplying more than 100 mA of continuous electric current at 5V to peripherals connected to the bus. This feature allows a USB port to power 5V DC-operated small electronic devices without issues. Many handheld gadgets, such as portable reading lamps, utilize this resource to recharge their built-in battery packs with the help of internal circuitry. Typically, a 5V DC, 100mA electric current is required to meet the input power demand. The accompanying diagram illustrates a versatile USB power socket that effectively converts 12V battery voltage into stable 5V. This circuit enables the powering or recharging of any USB-powered device using the in-dash cigarette lighter socket of a car. Capacitor C1 buffers any disturbances in the input supply. Resistors R1 and R2 regulate the output of IC1 to maintain a constant 5V, which is available at the A-type female USB socket. Red LED1 indicates the output status, while zener diode ZD1 serves as a protector against excessive voltage. The circuit should be assembled on a general-purpose PCB and enclosed within a slim plastic cabinet, along with the indicator and USB socket. When wiring the USB outlet, it is essential to ensure the correct polarity of the supply. For interconnection between the cigar plug pin and the device, a long coiled cord should be used as shown in the second image.

The USB power socket circuit is designed to convert a 12V input from a car battery into a stable 5V output suitable for USB-powered devices. The circuit comprises several key components that work together to ensure reliable operation. The input voltage from the car's battery is first filtered by capacitor C1, which smooths out any fluctuations or noise, providing a clean voltage source to the subsequent components.

The core of the circuit is IC1, which is typically a voltage regulator designed to output a constant 5V. Resistors R1 and R2 form a voltage divider that sets the output voltage level of IC1, ensuring it remains stable under varying load conditions. This stability is crucial for the proper functioning of USB devices, which can be sensitive to voltage variations.

The inclusion of red LED1 serves a dual purpose; it not only indicates when the circuit is powered and operational but also provides a visual cue for troubleshooting if the LED does not illuminate. Zener diode ZD1 is an essential protective component, safeguarding the circuit from voltage spikes that could damage both the power socket and the connected devices.

For assembly, the circuit should be mounted on a general-purpose PCB, which provides a sturdy platform for the components and facilitates easy connections. The enclosure in a slim plastic cabinet protects the circuit from physical damage and environmental factors while allowing for adequate ventilation to dissipate any heat generated during operation.

Proper wiring of the USB outlet is critical; incorrect polarity can lead to circuit failure or damage to connected devices. Therefore, care should be taken to verify connections before powering the circuit. The use of a long coiled cord for interconnection between the cigar plug and the device enhances flexibility and ease of use, allowing users to position their devices conveniently while ensuring a secure connection.A USB port, in practice, is capable of supplying more than 100 mA of continuous electric current at 5V to the peripherals which are hooked up with the bus. So a USB port could be utilized, without having any problems, for powering 5V DC operated tiny electronic devices.

Today, a lot of handheld gadgets (for example, portable reading lamps) utilise this resource of the USB port to recharge their built-in battery pack using the support of an internal circuitry. Typically 5V DC, 100mA electric current is needed to satisfy the input electrical power demand. The above diagram shows the circuit of a versatile USB power socket that properly converts the 12V battery voltage into stable 5V. This circuit can make it possible to power / recharge any USB power-operated device, working with in-dash board cigar lighter socket of the car.

Capacitor C1 buffers any disorder in the input supply. Resistors R1 and R2 regulate the output of IC1 to constant 5V, that is accessible at the A` type female USB socket. Red LED1 signifies the output condition and zener diode ZD1 acts as a protector against excessive voltage.

Assemble the circuit on a general purpose PCB and enclose inside a slim plastic cabinet as well as the indicator and USB socket. Whilst wiring the USB outlet, make sure proper polarity of the supply. For interconnection between the cigar plug pin as well as the device, use a long coil cord as shown in second image.