DE202016104063U1 - Inductor, LED driver and LED light - Google Patents

Abstract

An inductor comprising a magnetic core (1) and a coil (2) which is wound onto the magnetic core (1), characterized in that outside the coil (2) the magnetic shield (4) is placed with two ends as openings, outside the magnetic shield ( 4) of the metal shield (5) is placed, outside the metal shield (5) a pin (8) for grounding or the power supply is arranged.

Description

Field of engineering

The present utility model relates to the field of LED light, or LED light and its drivers.

State of the art

LED lights are characterized by many advantages such as large lighting angle, energy saving, long life, environmental protection and are highly appreciated. As technology progresses, LED lights are evolving in the direction of low volume and weight. In the case of existing LED luminaires, the housing of the luminaire mount is generally made of metal, and its driver is integrated in its luminaire mount. The metal housing of the lamp socket is usually used as an intermediate conductor, which connects the neutral of the driver with the neutral of the network. Because the metal housing is under voltage, the metal housing generates the electromagnetic field during operation of the LED lamp. In addition, integrated circuit (IC) and the power inductor for IC (Integrated Circuit) operation are generally integrated in the power circuit. When the LED light comes on, the power inductor generates the electromagnetic wave. The electromagnetic field of the electromagnetic wave generated by the power inductor overlaps with the electromagnetic field of the housing of the lamp base itself as it passes through the housing of the lamp holder, so that the lamp socket emits the stronger electromagnetic wave to the outside. When the volume of the light socket is very small, the spatial distance of the housing of the lamp socket to the power inductor becomes small, the loss of the electromagnetic wave emitted by the power inductor becomes small when transmitted to the housing of the lamp socket, the electromagnetic field overlapping on the Housing the lamp socket is transmitted, and the electromagnetic field of the housing of the lamp holder itself to each other, so that the lamp socket emits stronger electromagnetic wave to the outside, and this electromagnetic wave causes for external components of the lamp socket and the circuit electromagnetic interference. Therefore, it is necessary for the small LED lights to reduce the strength of the electromagnetic radiation to the outside of their light socket.

Content of the utility model

For the existing shortcomings of the prior art, the aim of the present utility model is to provide an inductor that emits the smaller electromagnetic radiation to the outside during operation.

In order to achieve the above-mentioned objective, the present utility model gives the following technical solution:
An inductor comprising a magnetic core and a coil which is wound on the magnetic core, characterized in that outside the coil of the magnetic shield with two ends is placed as openings, is placed outside the magnetic shield of the metal screen, outside of the metal screen, a pin for grounding or Power supply is arranged.

It is preferred that between the magnetic shield and the coil, a heat shrink tube is provided, which is coated on the coil.

It is preferred that an insulation layer is provided outside the metal screen.

It is preferred that a plurality of ventilation openings are arranged on the magnetic core, which connect the inner chamber of the magnetic shield with the outside.

It is preferable that there is a clearance between the heat-shrinkable tube and the magnetic shield that is connected to the ventilation holes.

It is preferred that the ventilation openings are distributed symmetrically along the axis of the magnetic core.

It is preferable that the diameter of the inductor is 3 to 7 mm, the height of which is 4 to 7 mm.

The second object of the present invention is to provide an LED driver which has higher stability and anti-interference capability.

In order to achieve the above-mentioned objective, the present utility model gives the following technical solution:
An LED driver comprising rectifier circuit, filter circuit whose input is connected to the output of the rectifier circuit, and control circuit whose input is connected to the output of the filter circuit and whose output is used to supply the operating current for the LED lamp, the control circuit IC (Integrated Circuit) and associated power inductor, which uses the above-mentioned inductor and whose metal shield is grounded.

The third object of the present utility model is to provide an LED lamp which is used in the Operating smaller electromagnetic radiation emitted to the outside, offer.

In order to realize the above-mentioned purposes, the present utility model gives the following technical solutions:
An LED luminaire, comprising bulb, lamp holder and lamp base, with the above-mentioned LED driver being installed in the lamp socket.

In comparison with the prior art, the present invention has the following advantages: the driver of this LED luminaire in the luminaire socket uses the double-shielded inductor as a power inductor. Because the electromagnetic radiation to the outside of such inductor good interference stability and he has low volume, and thus the driver can be designed as a circuit module with low volume and low radiation, therefore, the driver can be installed in a small light socket. The small LED lights with the built-in driver have the advantage of low electromagnetic radiation.

Brief description of the drawings

1 is the schematic representation of the structure of the inductor in the embodiment 1;

2 Fig. 12 is the circuit diagram of the LED driver with intensity control in Embodiment 2;

3 Fig. 12 is the circuit diagram of the LED driver without intensity control in Embodiment 2;

4 is the schematic representation of the structure of the LED lamp in the embodiment 4;

• Bezugszeichenliste: 1. Magnetkern; 2. Spule; 3. Warmschrumpfschlauch; 4. Magnetschirm; 5. Metallschirm; 6. Spiel; 7. Lüftungsöffnung; 8. Birne; 9. Leuchtenfassung; 91. Metall-Lampenschirm; 911. Anschlusskontakt; 92. Schaltkreisbaustein; 921. PCB Leiterplatte; 922. IC integrierter Schaltkreis; 923. Leistungsinduktor; 924. spannungsführende Leitung; 925. Nullleiter; 926. Erdleitung.

5 is the schematic representation of the internal structure of the lamp holder in the embodiment 4.

• LIST OF REFERENCE NUMBERS 1 , Magnetic core; 2 , Kitchen sink; 3 , Heat-shrink tubing; 4 , Magnetic shield; 5 , Metal screen; 6 , Game; 7 , Ventilation opening; 8th , Pear; 9 , Light socket; 91 , Metal lampshade; 911 , Terminal contact; 92 , Circuit block; 921 , PCB circuit board; 922 , IC integrated circuit; 923 , Leistungsinduktor; 924 , live wire; 925 , Neutral; 926 , Ground line.

embodiments

Embodiment 1

1 shows an inductor, in the I-shaped magnetic core 1 , Kitchen sink 2 on the magnetic core 1 is wound, magnetic umbrella 4 on the spool 2 is wrapped and metal screen 5 outside the magnet screen 4 are arranged one behind the other from the inside to the outside. Between heat shrink tubing 3 and magnetic umbrella 4 exists game 6 , at the bottom of the magnetic core 1 are several vents 7 arranged the game 6 connects with outside air. The top and bottom of the magnet screen 4 are the openings.

During operation of the inductor, the current flows through the coil 2 , Kitchen sink 2 generates the electromagnetic waves. The electromagnetic waves hit the magnetic screen when spreading outwards 4 , magnetic shield 4 Partially shields electromagnetic waves, remaining electromagnetic waves are transmitted by magnetic shield 4 further spread out and then meet metal screen 5 , metal screen 5 shields most electromagnetic waves by magnetic shield 4 pass so that only a few electromagnetic waves can be spread outwards. Thus, the electromagnetic radiation of the inductor for external electronic components and the circuit can be significantly weakened. To the shielding effect of the metal screen 5 to improve, is outside metal screen 5 Pin code 8th intended for grounding or mains connection. Because metal screen 5 with the electromagnetic shield increases the electrostatic coupling is metal screen 5 grounded or connected to the grid to avoid this adverse effect; while the current leakage can be prevented.

The top of the magnet screen 4 of the inductor commonly used with magnetic screen 4 equipped is locked. And between magnetic screen 4 and the upper end magnetic core 1 there is an air gap. When operating such an inductor, the magnetic field of the coil becomes 2 influenced by the air gap. The air gap has an influence on the density of the magnetic induction line. The larger the air gap, the smaller the density of the magnetic induction line, the smaller the air gap, the greater the density of the magnetic induction line. The greater the density of the magnetic induction line, the stronger the strength of the magnetic field in the air gap. If the magnetic field in the air gap is too strong, the electromagnetic waves will become magnetic shield 4 spread, so that magnetic screen 4 no better shielding effect achieved. For such an inductor, it is necessary for the purpose of reducing the volume, the air gap between the magnetic screen 4 and magnetic core 1 as possible to reduce, but for the purpose of increasing the shielding effect, it is necessary to the distance between the magnetic screen 4 and magnetic core 1 to enlarge as much as possible. Therefore, much time and energy is required for such an inductor to adjust the size of the air gap. And the top and bottom of the magnet screen 4 This inductor is open, making it between magnetic screen 4 and the upper end of the magnetic core 1 there is no air gap. With such changes, the shielding effect of the magnetic screen becomes 4 Although certainly reduced, but can be dispensed with the adjustment of the air gap in the manufacture of the inductor, and the increase in processing power. And the lost shielding properties of the magnetic screen 4 can through metal screen 5 be compensated. Through the interaction between magnetic screen 4 and metal screen 5 the inductor still has the stronger electromagnetic shielding capability.

The electromagnetic waves act on metal screen 5 , metal screen 5 will have the inductive current. To prevent the current leakage, outside is metal screen 5 the insulation coating applied as an insulating layer.

Heat-shrink tubing 3 gets on the coil 2 put on and serves for separation. Heat-shrink tubing 3 prevents the contact of the coil 2 with the magnetic screen 4 to avoid current leakage. During operation of the inductor becomes coil 2 generate much heat so that the temperature of the inductor is increased. To ensure proper functioning of the inductor is that of coil 2 dissipate generated heat in time. Because heat shrink tube 3 outside coil 2 is enveloped, the heat is on coil 2 on heat shrink tubing 3 guided, and of heat shrink tubing 3 in game 6 delivered, ventilation openings 7 connect game 6 with the outside air, so that the heat in game 6 can be removed outside the inductor, which is the heat dissipation of the inductor is useful. In order to allow the uniform heat dissipation of the inductor, there are ventilation holes 7 along the direction of the axis of the magnetic core 1 on the magnetic core 1 distributed symmetrically. Such design allows the heat to be dissipated uniformly throughout the inductor.

The dimensions of the inductor in the present embodiment: diameter is 3 to 7mm, height at 4 to 7mm, the inductor has the smaller volume.

Embodiment 2:

2 shows a circuit of the LED driver with the light intensity control, a rectifier circuit and a filter circuit, the rectifier circuit is the full-wave rectifier circuit, the live line of the network is connected through current limiting resistor R1 to one input of the full-wave rectifier circuit, the neutral of the network through inductor L1 with another input the full-wave rectifier circuit is connected, both ends of the capacitor C1 are respectively connected to two inputs of the full-wave rectifier circuit, capacitor C1 and inductor L1 LC rectifier circuit to filter the mains current before rectification. The output of the rectifier circuit is connected to the input of the filter circuit, the filter circuit is formed by inductor L1 and two capacitors C2. The positive output of the filter circuit is connected to the power inductor L2, the other end of the power inductor L2 is connected to the anode of the diode D1, the cathode of the diode D1 is connected to the positive electrode of the LED lamp; the negative output of the filter circuit is connected to the resistor R3, the other end of the resistor R3 to the negative electrode of the LED lamp. The type of IC (integrated circuit) is VAS1503. The public ground pole VSS of IC (integrated circuit) is connected to one end of the resistor R3, which approaches the negative output of the filter circuit, the end of the chip select signal CS of IC (integrated circuit) is connected to the other end of the resistor R3, the power input VIN of IC (Integrated Circuit) is connected to the anode of the diode D1. The positive pole of the electrolytic capacitor C3 is connected to the cathode of the diode, the negative pole of the electrolytic capacitor C3 is connected to the end of the chip select signal CS of IC (integrated circuit).

The full-wave rectifier circuit converts the alternating current into the direct current, inductor L1 and two capacitors C2 form the LC-π filter circuit, which filters the interference wave in direct current. IC integrated circuit and power inductor L2 by the interaction, adjust the current flowing in LED lamp to regulate the brightness of the LED lamp.

Embodiment 3

3 shows the circuit of the LED drives without light intensity control, which comprises the full-wave rectifier circuit, LC-π filter circuit, characterized in that the positive output of the filter circuit is connected to the cathode of the diode D1, the negative output of the filter circuit connected to one end of the resistor R3 , the other end of the resistor R3 is connected to the end of the chip select signal CS of IC (integrated circuit), the common input VIN of IC (integrated circuit) is connected to the anode of the diode D1, the public ground of IC (integrated circuit) Capacitor C2 is connected, the other end of capacitor C2 is grounded, the cathode of diode D1 is connected to the positive electrode of the lamp, one end of power inductor L2 is connected to the anode of diode D1, the other end of power inductor L2 is connected to the negative electrode of LED Light connected, the positive pole of the electrolytic capacitor C connected to the cathode of the diode D1 , the negative Pl of the electrolytic capacitor C connected to other end of the power inductor L2, the resistor R4 is connected in parallel with the electrolytic capacitor C.

The full-wave rectifier circuit converts the alternating current into the direct current, inductor L1 and two capacitors C2 form the LC-π filter circuit, which filters the interference wave in direct current. IC integrated circuit and the power inductor control by the interaction of the current flowing in LED light, so that the brightness of the LED light remains constant.

The power inductor L2 in this embodiment is the same as Embodiment 1, and the metal screen outside the power inductor is also grounded.

The power inductor L2 of the circuit of the LED driver with light intensity control and the circuit of the LED driver without light intensity control uses the inductor in Embodiment 1. Because power inductor L2 has weak electromagnetic radiation to the outside, strong disturbance stability, and low volume, LED driver can be made very small be and have higher reliability, and built in the no light socket of the LED light (eg type E14, E12 or even smaller).

Embodiment 4

4 shows an LED light, the light socket 9 and pear 8th includes. When installing the LED light, the light socket is 9 screwed into the appropriate lamp base.

5 shows light socket 9 , the metal case 91 and circuit block 92 in the metal case 91 includes, wherein circuit module 92 LED driver is. Circuit block 92 includes PCB circuit board 921 and IC working on PCB circuit board 921 integrated, as well as power inductor 923 which uses the inductor in Embodiment 1. The metal screen outside power inductor 923 is with the ground line 926 connected. Circuit block 92 has the live lead 924 for the mains connection and neutral 925 , being live wire 924 with connection contact 911 at the top of the metal housing 91 welded, neutral 925 with the inner wall of the metal housing 91 welded. If light socket 9 is screwed into the lamp base, is live cable 924 and neutral 925 switched on with the mains.

Because metal case 91 the light socket 9 usually as a neutral 925 the LED light with grid neutral 925 is connected (as in the present embodiment connected), forms during operation of the LED light, the live metal housing 91 even the electromagnetic field. Because in the general led lights power inductor 923 the driver in their lamp socket 9 usual inductor used with larger electromagnetic radiation, the electromagnetic field of the power inductor overlap 923 and the electromagnetic field of the metal housing 91 with each other and thus the stronger electromagnetic field is formed. For small light socket 9 the effect of such overlap is clearer. Therefore, general small LED lights can cause more electromagnetic interference during operation for the external components and circuits. And the inductor of the driver in the light socket 9 The LED lamp in this embodiment uses the inductor in Embodiment 1. In operation of the driver, most of the electromagnetic waves produced by the power inductor 923 are emitted, shielded, the electromagnetic field, that of power inductor 923 is emitted, and the electromagnetic field of the metal housing 91 of the light socket 9 even overlap with each other and thereby resulting new electromagnetic field is weak, this LED lamp emits during operation for the external components and circuits very weak electromagnetic radiation. Also because of the lower volume of the power inductor 923 can be circuit module 92 the driver as a compact small circuit chip 92 be formed and thus in the small LED light socket 9 be installed (eg Tpy E14, E12 or smaller light socket 9 , etc.).

Above mentioned are only the preferred embodiments of the present utility model. The scope of the present utility model is not limited to the above-mentioned embodiments. All technical solutions within the meaning of the present utility model fall within the scope of protection of the present utility model. It should be noted that for general technicians in this technical field, the improvements and changes in the principle of the present utility model are also to be understood as the scope of protection of the present utility model.

Claims (9)

Inductor comprising magnetic core ( 1 ) and coil ( 2 ) on the magnetic core ( 1 ), characterized in that outside the coil ( 2 ) the magnetic screen ( 4 ) is placed with two ends as openings, outside the magnetic screen ( 4 ) the metal screen ( 5 ), outside the metal screen ( 5 ) a pin ( 8th ) is arranged for grounding or mains connection. Inductor according to claim 1, characterized in that between the magnetic screen ( 4 ) and the coil ( 2 ) a heat shrink tube ( 3 ) provided on the spool ( 2 ) is wrapped. Inductor according to claim 2, characterized in that outside the metal screen ( 5 ) An insulation layer is provided. Inductor according to claim 3, characterized in that on the magnetic core ( 1 ) several ventilation openings ( 7 ) are arranged, which the inner chamber of the magnetic screen ( 4 ) connect to the outside. An inductor according to claim 4, characterized in that between the heat shrink tube ( 3 ) and the magnetic screen ( 4 ) a game ( 6 ), which with the ventilation openings ( 7 ) connects. Inductor according to claim 5, characterized in that the ventilation openings ( 7 ) along the axis of the magnetic core ( 1 ) are distributed symmetrically. Inductor according to claim 6, characterized in that the diameter of the inductor at 3 to 7mm, whose height is 4 to 7mm. LED driver comprising rectifier circuit, filter circuit whose input is connected to the output of the rectifier circuit, and control circuit whose input is connected to the output of the filter circuit and whose output is used to supply the operating current for the LED lamp, the control circuit the IC (integrated circuit) and associated power inductor using the inductor according to one of claims 1 to 7, and whose metal screen is grounded. LED light comprising pear ( 8th ) and light socket ( 9 ), characterized in that in the lamp socket ( 8th ), for example, LED driver according to claim 8 is located.

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