Damping inductor
By introducing the design of damping inductance into the inductor and adjusting the number of winding turns and the damping coefficient, the problem of resonant current and voltage fluctuation in the LC resonant circuit is solved, and current stability and loss reduction are achieved.
Patent Information
- Application Number
- CN202422688924.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-05
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-11-05
AI Technical Summary
In high-power power supply scenarios, the resonant current and voltage fluctuations caused by the LC resonant circuit affect the power supply stability. Existing technologies reduce the resonant frequency by adding a series inductor, but this cannot effectively reduce the Q value, resulting in current spikes and increased losses.
A damping inductor is designed by adding a damping loop between the main winding and the secondary winding, adjusting the number of winding turns and the damping coefficient, reducing the resonant current and stabilizing the bus voltage.
Effectively reduce the resonant current on the bus, stabilize the bus voltage, reduce current spikes, reduce line losses, and improve power supply stability.
Smart Images
Figure CN223450665U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the electronic field, especially relate to a damping inductance. BACKGROUND
[0002] In power use electric field, such as electric automobile, charging pile and so on, the DC current of power bus is as high as dozens of A to hundreds of A, and a larger energy storage capacitor is usually installed on the power bus to filter and store energy, so as to reduce the fluctuation of current on the bus.
[0003] The cable on the power supply line has a certain resolution inductance, although the inductance is very small, but in the whole loop, the inductance and the energy storage capacitor constitute an LC resonance circuit, in order to reduce the loss, the energy storage capacitor on the bus is generally selected to be smaller ESR (equivalent series resistance), and the bus DC resistance is also very small, so the Q value of the resonance circuit is relatively high. When the power receiving part is controlled by PWM, such as speed-adjustable DC motor, the current in the motor winding is controlled by PWM, if the PWM frequency is close to the resonance frequency in the LC resonance circuit, there will be a larger resonance current in the LC resonance circuit, and there will be a larger voltage fluctuation at both ends of the energy storage capacitor. This resonance current will bring greater loss, and it is easy to pollute the power supply, interfere with other devices, and greatly affect the working stability of the power receiving part.
[0004] In order to eliminate resonance, the current commonly used way is to connect an inductor in series on the bus power cable to reduce the resonance frequency, so that resonance occurs, but the existence of inductor only changes the resonance frequency, and in order to reduce the loss, the inductor in series also needs to have smaller DC resistance, so after the inductor is connected in series in the bus, the resonance frequency will be greatly reduced, but the LC resonance circuit still has a very high Q value. When the power receiving part is powered on or the power suddenly changes, there will be a high low-frequency component in the current surge, and the high Q value will still produce a transient current peak. Increasing damping is an effective means to reduce Q value, but connecting a resistor in series in the power bus will greatly increase the line loss, which lacks economy. SUMMARY
[0005] The utility model aims at solving above-mentioned problem, provides a kind of damping inductance for high-power power supply bus filter.
[0006] The damping inductance, including main winding, further comprising a winding, the two ends of the auxiliary winding are connected together, to form a damping circuit, increase the damping coefficient of the original inductor primary side, so that the damping inductance has larger damping coefficient, the damping inductance is connected in series in bus loop, can effectively reduce the resonance current on the bus, stabilize bus voltage.
[0007] The utility model discloses a damping inductance, including main winding, still including a secondary winding, the main winding and secondary winding series connection setting, the number of turns of main winding and the number of turns of secondary winding are different, the lead of main winding and secondary winding same name end parallel use as the two outgoing ends of damping inductance.
[0008] Further, the utility model discloses a damping inductance, the main winding or secondary winding sets up an intermediate tap, the intermediate tap with the outgoing pin of damping inductance short -circuit, can adjust the size of damping coefficient through the position of intermediate tap, can effectively reduce the resonance current on busbar through the increase of damping coefficient, stabilizes bus voltage.
[0009] The utility model discloses a damping inductance, through the improvement of existing inductance, adds a secondary winding to inductor, makes inductance have greater damping coefficient through the adjustment of damping inductance's damping coefficient, can effectively reduce the resonance current on busbar, stabilizes bus voltage with this damping inductance series connection in bus loop. DRAWINGS
[0010] Figure 1 It is the damping inductance structure schematic diagram for the utility model embodiment one.
[0011] Figure 2 It is the damping inductance structure schematic diagram for the utility model embodiment two.
[0012] Figure 3 It is the damping inductance structure schematic diagram for the utility model embodiment three. SPECIFIC EMBODIMENT
[0013] The utility model discloses a damping inductance is carried out detailed explanation below through drawing and embodiment.
[0014] Embodiment one
[0015] This embodiment discloses a kind of damping inductance, including main winding, still including a secondary winding, the two ends of the secondary winding are terminated together, and constitute a damping loop.
[0016] The secondary winding itself constitutes an electric circuit, when the current in the primary winding changes, the secondary winding is coupled to the current change in the primary winding through the magnetic core, and a current is formed in the secondary winding through the secondary winding circuit, which is ultimately consumed through the DC resistance of the secondary winding, thereby increasing the damping coefficient of the inductor, the energy consumed is related to the coupling rate between the primary winding and the secondary winding, the internal resistance of the secondary winding and other factors, so the damping coefficient of the damping inductor can be adjusted by changing the number of turns of the secondary winding.
[0017] The addition of the secondary winding can effectively improve the damping coefficient of the inductor, while also reducing the effective inductance value of the inductor, the damping effect of the secondary winding and the coupling rate between the primary winding and the secondary winding have a great relationship, and the processing and production requirements are higher.
[0018] In the embodiment of the present disclosure, as shown in Figure 1 The effective inductance of the inductor of the embodiment is about 12uH, and the inductor in the embodiment is connected in series on the 28V, 300W steering engine driving bus, the current peak in the power-on moment can be suppressed to within 25A, without short-circuiting the two lead-out wires of the secondary winding, the inductance of the primary winding is about 20uH, and the current peak in the power-on moment is suppressed to about 40A, thereby effectively reducing the resonance current on the bus and stabilizing the bus voltage.
[0019] Embodiment two
[0020] The embodiment discloses a damping inductor, which comprises a primary winding and a secondary winding, the primary winding and the secondary winding are connected in series, the number of turns of the primary winding is different from that of the secondary winding, and the lead-out wires of the primary winding and the secondary winding are connected in parallel at the same end and used as two lead-out ends of the damping inductor. Due to the difference in the number of turns of the primary winding and the secondary winding, the effect is similar to increasing the damping inductor of the secondary winding, the number of turns of the two windings can be changed to adjust the final effective inductance value and the damping coefficient of the inductor, the resonance current on the bus can be effectively reduced by increasing the damping coefficient, and the bus voltage is stabilized.
[0021] The double-winding inductor has the characteristics of simple processing technology, easy guarantee of the coupling rate between the two windings, and higher consistency of the batch-produced inductors.
[0022] In the embodiment of the present disclosure, as shown in Figure 2As shown, using a 13mm outer diameter of Fe-Si-Al magnetic core, the first winding uses 0.75mm diameter enameled wire to wind 15 turns, the second winding uses 0.75mm diameter enameled wire to wind 12 turns, the two windings are connected in parallel at the same end as the lead-out pin of the inductor, the effective inductance value of the inductor in this embodiment is about 10uH, compared with the first embodiment, the overcurrent capacity of this embodiment is higher, and the inductor in this embodiment is connected in series on the 28V, 300W steering engine driving bus, which can suppress the current peak in the power-on moment from 80A to within 28A.
[0023] Embodiment three
[0024] Based on embodiment two, the damping inductor disclosed in this embodiment is provided with an intermediate tap; the intermediate tap is short-circuited with one lead-out pin of the damping inductor; the size of the damping coefficient can be adjusted by changing the position of the intermediate tap, and the resonance current on the bus can be effectively reduced by increasing the damping coefficient, thereby stabilizing the bus voltage.
[0025] The structure of the damping inductor disclosed in this embodiment can ensure the consistency between the two groups of windings as much as possible, and has the characteristics of both the first embodiment and the second embodiment.
[0026] In the embodiments of the present disclosure, as shown in Figure 3 As shown, using a 13mm outer diameter of Fe-Si-Al magnetic core, the first winding uses 0.75mm diameter enameled wire to wind 15 turns, the second winding uses 0.75mm diameter enameled wire to wind 12 turns, the two windings are connected in parallel at the same end as the lead-out pin of the inductor, the effective inductance value of the inductor in this embodiment is about 10uH, compared with the first embodiment, the overcurrent capacity of this embodiment is higher, and the inductor in this embodiment is connected in series on the 28V, 300W steering engine driving bus, which can suppress the current peak in the power-on moment from 80A to within 28A.
Claims
1. A damping inductor comprising a main winding; characterized in that: It also includes a secondary winding; two ends of the secondary winding are connected together to form a damping circuit.
2. A damping inductor comprising a main winding; characterized in that: It also includes a secondary winding; the main winding and the secondary winding are arranged in series; the number of turns of the main winding is different from the number of turns of the secondary winding; the same-name ends of the leads of the main winding and the secondary winding are connected in parallel and used as two lead ends of the damping inductor.
3. The damping inductor according to claim 2, characterized in that: The main winding or the auxiliary winding is provided with an intermediate tap; the intermediate tap is short-circuited with a lead pin of the damping inductor.