CN215871920U

CN215871920U - Output circuit of lamp power supply

Info

Publication number: CN215871920U
Application number: CN202122457094.3U
Authority: CN
Inventors: 王安; 王军; 莫容纪
Original assignee: Taizhou Jiaojiang Yingxing Electronic Electrical Appliance Co ltd
Current assignee: Taizhou Jiaojiang Yingxing Electronic Electrical Appliance Co ltd
Priority date: 2021-10-11
Filing date: 2021-10-11
Publication date: 2022-02-18
Anticipated expiration: 2031-10-11

Abstract

The utility model provides an output circuit of a lamp power supply, belonging to the field of lamp power supplies and solving the problems that under the condition of ensuring smooth power supply, the problem of polluting a power grid is avoided, the power grid pollution prevention device comprises an input interface and a work output interface, a rectifying circuit, a filter circuit and a voltage transformation and current transformation circuit are arranged between the work output interface and the input interface, the filter circuit comprises a capacitor Ca, a capacitor Cb, a capacitor Cu, a capacitor Cv, an inductor L1, an inductor L2, a diode Da, a diode Db, a diode Dc and a resistor Ra, the output end of the capacitor Cu is connected with the input end of the diode Da and the output end of the diode Db, the input end of the capacitor Cv is connected with the input end of the diode Dc and the output end of the diode Da, the inductor L1 is connected with the diode Db, the diode Da, the resistor Ra and the diode Dc in series, the inductor L1 and the inductor L2 are connected in parallel, the two ends of the inductor Ca and the capacitor Cb are connected in parallel, and the capacitor Ca and the capacitor Cb are connected in parallel. The design of the utility model effectively ensures the stability of use.

Description

Output circuit of lamp power supply

Technical Field

The utility model relates to the field of lamp power supplies, in particular to an output circuit of a lamp power supply

Background

In recent years, with the rapid development of power electronic technology, the application of switching power supplies is becoming more and more widespread. On one hand, the switching power supply is developing toward high reliability and miniaturization; on the other hand, the power capacity and power density of the power electronic device are continuously improved, after the alternating current input by the power grid is converted into direct current through the converter, medium-high frequency noise waves and interference signals are filtered through the rectifying circuit, so that a relatively clean power supply is obtained for a load, and meanwhile, in order to avoid reducing damage of harmonic waves to the load, the conduction angle of the rectifying diode is increased, so that the distortion of the alternating current input current is reduced.

A novel valley-fill circuit as disclosed in patent No. CN204539569U includes: a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a diode D1, a diode D2 and a diode D3, wherein the anode of the capacitor C1 is connected with the anode of the rectifying circuit T1, the cathode of the diode D1 and the anode of the capacitor C2 in parallel and then connected with the anode A1 of the valley filling circuit, the cathode of the capacitor C1 is connected with the anode of the diode D2 and then connected with the cathode of the diode D3, the cathode of the diode D2 is connected with the anode of the diode D1 and then connected with the anode of the capacitor C3, the cathode of the capacitor C2 is connected with the anode of the capacitor C4, the cathode of the capacitor C4 is connected with the cathode of the capacitor C3, the anode of the diode D3 and the cathode of the negative direction of the rectifying circuit T1 and then connected with the cathode B1 of the valley filling circuit, the cathode of the rectifying circuit T1 is connected with the anode Q1 of the AC power supply, the valley filling circuit is arranged behind the rectifying circuit, so that the conduction angle of the rectifying diode is increased, and the distortion of the alternating current input current is reduced.

The two schemes are to avoid reducing the damage of harmonic waves to the load by filtering medium-high frequency electric waves, wherein the comparison document 1 is additionally provided with a valley filling circuit on the basis, so that the comparison document has higher power factors and has better burr removing effect, but the rectifying circuit has filtering capability and cannot ensure the using effect, so that the breakdown of a capacitor can be caused, serious damage is generated, a power supply cannot be used, and therefore on the premise of ensuring smooth power supply, the harmonic waves are further reduced, the harmonic waves are prevented from being injected into a power grid, and the stability of the power grid and the system is endangered.

Disclosure of Invention

The utility model aims to solve the problems in the prior art, and provides a driving power supply of a lamp, which aims to solve the technical problems that: how to further reduce the harmonics prevents their injection into the grid, jeopardizing the stability of the grid and of the system itself.

The purpose of the utility model can be realized by the following technical scheme: an output circuit of a lamp power supply comprises an input interface of an LED lamp power supply and a working output interface used for connecting a load, wherein a rectifying circuit, a filter circuit and a voltage-variable current-variable circuit are arranged between the working output interface and the input interface, the filter circuit is connected after the input interface is connected with the rectifying circuit, the filter circuit is connected with the voltage-variable current-variable circuit, the filter circuit comprises a capacitor Ca, a capacitor Cb, a capacitor Cu, a capacitor Cv, an inductor L1, an inductor L2, a diode Da, a diode Db, a diode Dc and a resistor Ra, the inductor L1 and the inductor L2 are connected in parallel, two ends of the inductor are connected with the capacitor Ca and the capacitor Cb in parallel, the positive pole of the capacitor Cu is connected with the negative poles of the diode Da and the diode Db, the positive pole of the capacitor Cv is connected with the positive pole of the diode Dc and the negative pole of the diode Da, the resistor Ra is connected with the negative pole of the diode Da and the positive pole of the diode Dc, inductor L2 is connected in series with capacitor Cu, capacitor Cv, diode Da, and resistor Ra, and inductor L1 is connected in series with diode Db, diode Da, resistor Ra, and diode Dc.

In the output circuit of the lamp power supply, the cathode of the capacitor Cu is connected to the anode of the diode Da and the cathode of the diode Db, and when a current flows into the inductor L2 through the rectifier circuit, the capacitor Ca and the capacitor Cb are connected in parallel to the two ends of the inductor L1 and the inductor L2, so that the energy storage and voltage stabilization functions are achieved, and the phenomena that the breakdown of circuit elements is caused by an excessive instantaneous voltage and the harmonic wave is injected into a power grid, the service life of the circuit is prolonged, and the stability of the system is affected are avoided. After passing through the capacitor Cu, the current can only flow towards the diode Da due to the connection with the anode of the diode Da and the cathode of the diode Db, so that the current is prevented from flowing towards the wrong direction, and after passing through the diode Da, the current flows towards the capacitor Cv through the resistor Ra and finally flows towards the load through the voltage transformation and current transformation loop, on the contrary, when the current is connected into the inductor L1 through the rectifying circuit, the inductor L1 is connected with the diode Db, the diode Da, the resistor Ra and the diode Dc in series, and the diode Dc is connected in series for single-term conduction through the diode connected in series, so that the load is stably output, large frequency fluctuation is avoided, and the stability of the system is affected.

Preferably, the rectifier circuit is a bridge rectifier circuit, two anodes of the bridge rectifier circuit BD1 are input interfaces, and cathodes thereof are respectively connected with the inductor L1 and the inductor L2. After the alternating current becomes the direct current through bridge rectifier circuit, access inductance L1 or inductance L2, when the frequency of radio wave surpassed the definition scope, can produce reverse ripples and then offset each other, guarantee that the circuit can not be because of instantaneous high frequency, damage electronic component, promote user's use and experience, guaranteed safe in utilizationly simultaneously.

As an optimization scheme, both the capacitor Cu and the capacitor Cv adopt electrolytic capacitors. Because the capacitor Cu and the capacitor Cv both adopt electrolytic capacitors, the rated capacity and the capacitance per unit volume are dozens to hundreds of times larger than those of other capacitors, and the transient pressure can be ensured not to be overlarge through a large amount of stored energy, so that the load and other electronic elements on a loop can not be punctured.

As an optimization scheme, the capacitance values of the capacitor Cu and the capacitor Cv are in a proportional relation with the maximum output power pout of the load, the proportionality coefficient K is pout/C, and the proportionality coefficient K is 2.6-3.4. The proportionality coefficient K is limited to be 2.6-3.4, the working stability of the power supply is improved, adverse reactions are avoided, and the stability of the load power supply is ensured through slow charging of the capacitor Cu and the capacitor Cv.

Compared with the prior art, the utility model has the following advantages:

1. according to the scheme, the inductor L1, the inductor L2, the capacitor Ca and the capacitor Cb are added on the basis of the prior art, and the current passes through the capacitor before being connected into the inductor, so that the effect of stabilizing the pressure is achieved, and the electronic element caused by overlarge instantaneous pressure cannot be broken down.

2. Through the electrolytic capacitor, the resistor and the diode, the flow direction is ensured to be correct, meanwhile, the load is stably charged and discharged, and the stability of the load is ensured.

Drawings

FIG. 1 is a circuit diagram of the overall structure of an embodiment of the present invention;

in the figure, 1, an input interface; 2. a rectifying circuit; 3. a filter circuit; 4, a voltage transformation and current transformation circuit; 5. and (6) an output interface.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1, an output circuit of a lamp power supply includes an input interface of an LED lamp power supply, a working output interface 5 for connecting a load, a rectifier circuit 2, a filter circuit 3 and a transformer converter circuit 4 between the working output interface 5 and the input interface 1, where the rectifier circuit 2 is a bridge rectifier circuit, the input circuit is connected to the rectifier circuit 2 and then connected to the filter circuit 3, the input circuit is adjusted by the filter circuit 3 and then connected to the transformer converter circuit 4, the filter circuit 3 includes a capacitor Ca, a capacitor Cb, a capacitor Cu, a capacitor Cv, an inductor L1, an inductor L2, a diode Da, a diode Db, a diode Dc and a resistor Ra, the capacitor Cu and the capacitor Cv adopt an electrolytic capacitor, the capacity of the capacitor Cu and the capacitor Cv are in a proportional relationship with a maximum output pout of the load, a proportionality coefficient K is pout/C, the proportionality coefficient K is between 2.6-3.4, an output port of the bridge rectifier circuit is connected to the inductor L1 and the inductor L2, the negative electrode of the capacitor Cu is connected with the positive electrode of the diode Da and the negative electrode of the diode Db, the positive electrode of the capacitor Cv is connected with the positive electrode of the diode Dc and the negative electrode of the diode Da, the resistor Ra is connected with the negative electrode of the diode Da and the positive electrode of the diode Dc, the inductor L2 is connected with the capacitor Cu, the capacitor Cv, the diode Da and the resistor Ra in series, the inductor L1 is connected with the diode Db, the diode Da, the resistor Ra and the diode Dc in series, the inductor L1 and the inductor L2 are connected in parallel, the two ends of the inductor L1 are connected with the capacitor Ca and the capacitor Cb, and the capacitor Ca and the capacitor Cb are connected in parallel. Alternating current mains supply enters a bridge rectifier circuit through an input interface to be converted into direct current, the direct current is subjected to energy storage and voltage stabilization through a capacitor Ca and an inductor L2, the irreversible influence caused by breakdown of an electronic element due to overhigh instantaneous voltage is prevented, the processed current is stored and released through a capacitor Cb, and then enters a unidirectional electrolytic capacitor Cu, flows to a diode Da and a resistor Ra after passing through Cv, finally enters a voltage transformation and current transformation circuit through an electrolytic capacitor Cv, and then enters a load to achieve the effect of slow charging, and the circuit is rapidly discharged through a diode Db and a diode Dc on the other side.

The specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the utility model as defined in the appended claims.

Although 1, the input interface is used more herein; 2. a rectifying circuit; 3. a filter circuit; 4, a voltage transformation and current transformation circuit; 5. output interface, etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims

1. An output circuit of a lamp power supply comprises an input interface of an LED lamp power supply and a working output interface used for connecting a load, wherein a rectifying circuit, a filter circuit and a voltage-variable current-variable circuit are arranged between the working output interface and the input interface, the input interface is connected with the filtering circuit after being connected with the rectifying circuit, and the filter circuit is connected with the voltage-variable current-variable circuit, and the output circuit is characterized in that the filter circuit comprises a capacitor Ca, a capacitor Cb, a capacitor Cu, a capacitor Cv, an inductor L1, an inductor L2, a diode Da, a diode Db, a diode Dc and a resistor Ra, the inductor L1 and the inductor L2 are connected in parallel, the two ends of the inductor Ca and the capacitor Cb are connected in parallel, the positive pole of the capacitor Cu is connected with the negative poles of the diode Da and the diode Db, the positive pole of the capacitor Cv is connected with the positive pole of the diode Dc and the negative pole of the diode Da, the resistor Ra is connected with the cathode of the diode Da and the anode of the diode Dc, the inductor L2 is connected with the capacitor Cu, the capacitor Cv, the diode Da and the resistor Ra in series, and the inductor L1 is connected with the diode Db, the diode Da, the resistor Ra and the diode Dc in series.

2. The output circuit of claim 1, wherein the rectifier circuit is a bridge rectifier circuit, and the two positive electrodes of the bridge rectifier circuit BD1 are input interfaces, and the negative electrodes thereof are respectively connected to the inductor L1 and the inductor L2.

3. The output circuit of a lamp power supply according to claim 1 or 2, wherein the capacitor Cu and the capacitor Cv are electrolytic capacitors.

4. The output circuit of claim 3, wherein the capacitance values of the capacitor Cu and the capacitor Cv are proportional to the maximum output power pout of the load, and the proportionality coefficient K is equal to pout/C, and the proportionality coefficient K is between 2.6 and 3.4.