Overview of the Board HJX-112-DC / Di-i11
↳ Board Number: HJX-112-DC / Di-i11
↳ Board Version: V4.0
↳ Application Type: AirPods Charging and Earbuds Charging Board
Components:
1. Charging Connector
2. Coil
3. Power Bank Charging IC
4. EarBuds Charging IC
5. Mini Switch
6. Battery
7. Resistor, Capacitor.
HJX-112-DC / Di-i11 Circuit Explain Description
Charging Connector
The Charging Connector is where the outside control source interfaces with the charging board. Regularly, this connector is a Type-C or Micro-USB harbour through which control is provided from a divider charger or a USB port.
Purpose: It supplies control to both the Control Bank Charging IC and the EarBuds Charging IC, which at that point oversees the charging of the inside battery and the earbuds themselves.
Operation: When a charger is associated, the control passes through the charging connector into the circuit, permitting the ICs to start overseeing the charging process.
The Charging Connector is the door for power to enter the circuit and control the charging system.
Coil
↳ Coil Number: 2r2
↳ Coil Value: 2.2 uH
↳ Coil Max DC current: 4.1 A
↳ Coil Max DC resistance: 16.7 mΩ
↳ Coil Self-resonant frequency: MHz
↳ Coil Tolerance: ± 20%
↳ Coil Package/case: 0735
↳ Coil Shielded: Yes
↳ Coil Core Material: Ferrite
↳ Coil Operating temperature -40 to +125°C
↳ Coil Dimensions: 7.6 mm x 7.6 mm x 3.5 mm
This Coil (labelled 2r2), with an esteem of 2.2 µH, is a basic component in DC-DC converter circuits. In the case of the TWS earbuds charging board, the coil changes the control from the charging connector into a steady frame for the battery and other components.
Purpose: This coil plays a part in boosting or bucking voltage depending on the needs of the circuit. It is especially imperative for smoothing out current in the charging handle, guaranteeing steady control delivery.
Max DC Current: This coil can handle up to 4.1A, meaning it can carry a critical sum of current without overheating.
DC Resistance: With a resistance of 16.7 mΩ, it offers negligible resistance to the current, which makes a difference in keeping control misfortunes low.
Shielded: This coil is protected, which anticipates electromagnetic obstructions from influencing other components.
Coils like this one are utilized to stabilize and direct the voltage and current, guaranteeing smooth and effective charging operations.
Control Bank Charging IC (ZK406)
↳ Charging IC Number: ZK406
↳ IC Serial Number: 1930
↳ Total Pin: 6
This ZK406 Control Bank Charging IC is dependable for overseeing the charging of the inside battery inside the TWS earbuds case. This IC controls how much current and voltage are conveyed to the battery, guaranteeing it charges securely and efficiently.
6 Pins: These pins interface the IC to different parts of the circuit, such as the coil, battery, and charging connector.
Functionality: It steps down the voltage from the charging connector and directs it to coordinate the required voltage of the battery (ordinarily 4.2V for most Li-ion batteries).
This Control Bank Charging IC guarantees that the battery inside the case is charged appropriately without cheating or overheating. It’s significant for overseeing the vitality input and giving security to the battery.
EarBuds Charging IC (SY3408)
This SY3408 is the EarBuds Charging IC, capable of disseminating control to the earbuds whereas they are docked in the case. It guarantees that each earbud charges at the rectified voltage and current, keeping up secure charging conditions.
8 Pins: These pins interface the IC to the earbuds' charging contacts, the battery, and other components.
Power Conveyance: This IC acts as a control wholesaler, making beyond any doubt that the redress sum of current is provided to the earbuds whereas too overseeing the by and large control flow.
This IC guarantees that both the cleared-out and right earbuds are charged similarly and productively, permitting them to reach full charge without cheating or damage.
AirPods Charging: This board is designed to handle the charging requirements of Apple AirPods This ensures that the earbuds receive and pass the correct voltage and current to charge efficiently and safely.
Earbud charging: In addition to AirPods, it can also charge other types of earbuds, indicating its versatile application in various earbud charging cases.
Smaller than expected Switch
The Smaller-than-expected Switch plays a user-interface part. Ordinarily, it’s utilized for capacities like:
Power On/Off: Actuating or deactivating the charging process.
Battery Level Checking: A few charging cases incorporate a button to check the remaining battery level using Driven indicators.
Reset Usefulness: In a few cases, squeezing this switch for a certain period resets the charging case.
This little however imperative component permits the client to control the charging case physically. Its flag is sent to the Control IC, which starts the significant activity (like beginning or ceasing the charging process).
Battery (250 mAh, 4.2V)
The Battery is at the heart of the charging case, giving the vital control to charge the earbuds and keep them utilitarian for amplified periods. In this case, the battery is a 250 mAh Li-ion or Li-Polymer battery.
Voltage: The battery has an ostensible voltage of 4.2V, which is standard for Li-ion batteries.
Capacity: With a capacity of 250 mAh, it can store sufficient vitality to charge the earbuds at different times time recently requiring a recharge.
The battery stores the vitality gotten through the charging connector and supplies it to the EarBuds Charging IC to control and charge the earbuds.
What is the battery capacity used in the TWS earbuds case?
250 mAh
What is the nominal voltage of the battery used in the TWS earbuds case?
4.2V
What is the type of charging connector typically used in TWS charging boards?
Type-C or Micro-USB
What is the maximum DC rating of the coil on the board?
4.1A
What is the purpose of the Mini Switch on the TWS charging board?
It is used for functions like power on/off, checking battery status, and resetting the charging case.
What component smooths out voltage fluctuations in the circuit?
Capacitors
What component limits current flow to protect sensitive parts of the circuit?
Resistors
How does the ZK406 IC protect the internal battery from overcharging?
It monitors the battery voltage and stops the charging process when the battery reaches maximum capacity.
Resistors and Capacitors
Both resistors and capacitors are detached components that play strong parts in guaranteeing the steady operation of the charging board:
Resistors: These are utilized to restrain the current stream, guaranteeing that the fitting sum of current comes to each component. This makes a difference in ensuring touchy components from an abundance current that seems to lead to damage.
Resistors moreover help in voltage division, permitting diverse parts of the circuit to work at the required voltage levels.
Capacitors: Capacitors store and discharge electrical vitality, acting as little batteries that smooth out voltage variances. This is basic in a charging circuit where steady voltage is required to guarantee smooth charging.
Capacitors offer assistance in sifting clamour from the control supply, which may be something else meddled with the legitimate working of the ICs and other components.
These components are scattered over the charging board and play different parts in guaranteeing that the circuit works easily and safely.
Working Rule of the Charging Board
Power Input and Conversion:
When the charging case is stopped into an outside control source, power enters the framework through the Charging Connector.
The Control Bank Charging IC (ZK406) gets this control and oversees the charging preparation. It changes over the higher voltage from the charger into an appropriate level for the battery (as a rule 4.2V).
Battery Charging
The ZK406 IC guarantees that the inside battery charges securely and effectively. It screens the battery’s voltage, avoiding cheating by ceasing the charge when the battery comes to its greatest capacity.
The Coil (2r2) makes a difference in controlling and stabilizing the current streaming into the battery, avoiding changes that seem to harm the battery.
Earbuds Charging
The EarBuds Charging IC (SY3408) disseminates the control put away in the case’s battery to the person's earbuds. It controls the charging current and voltage to guarantee that the earbuds charge safely.
The SY3408 IC moreover anticipates cheating on the earbuds by checking their battery status and cutting off the current when they are completely charged.
User Interface and Control
The Scaled Switch permits the client to connect with the case, such as turning the case on/off or checking the battery status. When squeezed, it sends a flag to the charging board’s rationale, which triggers the significant action.
Resistors and Capacitors for Stability:
Resistors restrain the current streaming through the circuit to secure delicate components.
Capacitors smooth out voltage vacillations and offer assistance to utilize the control supply, guaranteeing that the ICs and other components work properly.
Conclusion
The TWS Earbuds Case Charging Board (HJX-112-DC / Di-i11 V4.0) is a well-designed framework that oversees the charging preparation of both the earbuds and the case itself. Each component plays a crucial part in guaranteeing proficient and secure charging:
➔ The Control Bank Charging IC (ZK406) oversees the battery charging.
➔ The EarBuds Charging IC (SY3408) disperses control to the earbuds.
➔ The Coil makes a difference in stabilizing and voltage.
➔ The Smaller Switch gives the client control.
➔ The Battery stores the vitality to charge the earbuds.
➔ Resistors and capacitors guarantee smooth and steady operation of the circuit.
What is the main Power Bank Charging IC number used in the Di-i11 TWS earbuds charging board?
ZK406
What is the Earbuds Charging IC number used for charging the earbuds in TWS?
SY3408
How many pins does the Power Bank Charging IC (ZK406) have?
6 pins
How many pins does the EarBuds Charging IC (SY3408) have?
8 pins
What is the value of the coil used in the charging board?
2.2 µH
What is the main role of the coil in the TWS earbuds charging board?
To stabilize and regulate the voltage and current during the charging process.
What type of component is used to store energy temporarily to smooth out power delivery?
Capacitors
What function does the SY3408 IC serve in the TWS earbuds case?
It distributes power to the earbuds and controls their charging process.
What is the resistance of the coil used in the TWS charging board?
16.7 mΩ
How does the Earbuds Charging IC (SY3408) prevent overcharging of the earbuds?
It monitors the earbuds' battery status and cuts off the current when fully charged.
What is the typical operating temperature range for the coil used in the TWS charging board?
-40°C to +125°C
What is the typical use of resistors in the TWS charging board circuit?
To limit the current and assist in voltage division to ensure the circuit components receive the correct current and voltage.