Product Specification

Aluminum DC Choke 140uH/254uH/480uH 690V Capacitor Variable Speed Drive DC Reactor

1.Product Description

This custom DC choke/reactor offers versatile inductance options (140μH, 254μH, 480μH) for high-voltage applications up to 690V, designed to smooth DC current, reduce ripple, and protect power electronics in industrial drives, renewable energy systems, and HVDC applications. Its robust construction ensures reliable performance in demanding environments with high current capacity and minimal losses.

DC choke is a passive electronic component used to suppress high-frequency noise or ripple in DC circuits. Its core feature is the use of inductance to obstruct current changes. The following are its main characteristics:

1. Suppress high-frequency noise
Low pass filtering characteristics: DC Choke has extremely low impedance to DC or low-frequency signals (mainly from the DC resistance of wires), but exhibits high impedance to high-frequency noise (such as switching noise of switching power supplies, EMI/RFI interference), which can effectively filter out these interferences.

Combined with capacitors: often combined with capacitors to form LC filters, further smoothing the DC power supply.

2. Maintain DC stability
Preventing sudden changes in current: By utilizing the characteristic of inductance that "obstructs current changes", it suppresses current fluctuations caused by load changes or power supply switching, and protects the circuit from instantaneous shocks.

Reduce Ripple: In switch mode power supplies (such as Buck/Boost circuits), the current ripple at the output can be reduced.

3. Low DC resistance (DCR)
High efficiency: During design, it is necessary to minimize the direct current resistance (DCR) of the winding to reduce power loss and heat generation, especially in high current applications such as motor drives and photovoltaic inverters.

4. Saturation current capability
Anti magnetic saturation: It is necessary to choose a model with a saturation current (Isat) higher than the operating current to avoid a sudden drop in inductance value due to magnetic core saturation, which may cause failure. Commonly used powder magnetic cores (such as iron silicon aluminum) or open-loop magnetic cores are used to improve saturation resistance.

5. Application scenarios
Power circuit: Switching power supply input/output filtering, DC-DC converter.

Motor drive: Suppress the noise generated by motor commutation.

New energy system: DC bus filtering for photovoltaic inverters and electric vehicle charging stations.

Industrial equipment: EMI suppression for welding machines and frequency converters.

6. Differences from AC Choke
DC bias: DC chokes need to withstand DC current in the magnetic core, and the stability of inductance under bias should be considered in the design; And AC chokes (such as AC inductors) only handle alternating current.

No eddy current loss: The magnetic core has no alternating magnetic field under DC, so there is no eddy current loss (but attention should be paid to saturation caused by DC bias).

7. Key parameters for selection
Inductance value (L): Select based on noise frequency and filtering requirements.

Rated current: including DC working current and saturation current.

DCR: Affects power consumption and temperature rise.

Temperature characteristics: Whether the inductance value is stable at high temperatures.

summarize
DC Choke achieves DC stability and noise suppression through its inductive characteristics, and its performance depends on the magnetic core material, winding design, and operating conditions. In high-performance or high-power applications, it is necessary to balance the inductance value, saturation current, and DCR.

2.Performance Characteristics

3.Company Profile