CN213073196U

CN213073196U - Anti-interference LED protection circuit

Info

Publication number: CN213073196U
Application number: CN202022276069.0U
Authority: CN
Inventors: 朱剑阳
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-10-15
Filing date: 2020-10-15
Publication date: 2021-04-27
Anticipated expiration: 2030-10-15

Abstract

The utility model discloses an anti-interference LED protection circuit, which comprises a full-wave rectification circuit and an LED, wherein the full-wave rectification circuit comprises D1 and D2, d3 and D4, full wave rectifier circuit is equipped with first, the second input end, positive negative output end, the input and the positive output end of LED are connected, the output and the negative output end of LED are connected, the D1 input is connected with first input end, the D1 output is connected with the positive output end, the D2 input is connected with the second input end, the D2 output is connected with the positive output end, the D3 output is connected with first input end, the D3 input is connected with the negative output end, the D4 output is connected with the second input end, the D4 input is connected with the negative output end, it has at least one zener diode ZD1 to establish ties between the input of LED and the positive output end, prevented because of the surplus low voltage that energy storage components and devices discharge and produced, and electromagnetic wave interference makes the LED be in the little bright instruction.

Description

Anti-interference LED protection circuit

Technical Field

The utility model belongs to the LED lamp field specifically is an anti-interference LED protection circuit.

Background

The LED lamp has the characteristics of low starting voltage and low energy consumption, and the LED lamp is in a slightly bright state only by slightly keeping the starting voltage of the LED lamp in a circuit when in use. In industrial application, when an LED lamp is on to represent signal output, and when the LED lamp is off to represent signal interruption, after a power supply of actual equipment is interrupted, the LED lamp can be in a slightly-on indicating state due to the fact that induced voltage exists in a circuit or the margin low voltage of a capacitor cabinet exists in the circuit, and the state of the signal cannot be judged manually, so that interference is easily generated on data information needing manual judgment, and the final data is inaccurate.

Disclosure of Invention

An object of the utility model is to provide an anti-interference LED protection circuit to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

an anti-interference LED protection circuit comprises a full-wave rectification circuit and an LED, wherein the full-wave rectification circuit comprises D1, D2, D3 and D4, the full-wave rectification circuit is further provided with a first input end, a second input end, an anode output end and a cathode output end, the input end of the LED is connected with the anode output end, the output end of the LED is connected with the cathode output end, the input end of D1 is connected with the first input end, the output end of D1 is connected with the anode output end, the input end of D2 is connected with the second input end, the output end of D2 is connected with the anode output end, the output end of D3 is connected with the first input end, the input end of D3 is connected with the cathode output end, the output end of D4 is connected with the second input end, the input end of D4 is connected with the cathode output end, and at least one voltage stabilizing diode ZD1 is connected between the input end of the, the cathode of the voltage-stabilizing diode ZD1 is connected with the anode output end, and the anode of the voltage-stabilizing diode ZD1 is connected with the LED input end.

According to the further technical scheme, the number of the voltage stabilizing diodes is two, and the two voltage stabilizing diodes comprise a voltage stabilizing diode ZD1 and a voltage stabilizing diode ZD2, the voltage stabilizing diode ZD1 is connected with the voltage stabilizing diode ZD2 in a head-to-tail mode, and the anode of the voltage stabilizing diode ZD2 is connected with the input end of the LED.

An anti-interference LED protection circuit comprises a full-wave rectification circuit and an LED, wherein the full-wave rectification circuit comprises D1, D2, D3 and D4, the full-wave rectification circuit is further provided with a first input end, a second input end, an anode output end and a cathode output end, the input end of the LED is connected with the anode output end, the output end of the LED is connected with the cathode output end, the input end of D1 is connected with the first input end, the output end of D1 is connected with the anode output end, the input end of D2 is connected with the second input end, the output end of D2 is connected with the anode output end, the output end of D3 is connected with the first input end, the input end of D3 is connected with the cathode output end, the output end of D4 is connected with the second input end, the input end of D4 is connected with the cathode output end, a voltage stabilizing diode ZD1 is connected in series between the first input end, the cathode of the voltage stabilizing diode ZD1 is connected with a first input end, the anode of the voltage stabilizing diode ZD1 is connected with the input end of D1, a voltage stabilizing diode ZD3 is connected in series between the first input end and D3, the anode of the voltage stabilizing diode ZD3 is connected with the first input end, and the cathode of the voltage stabilizing diode ZD3 is connected with the output end of D3.

According to the further technical scheme, a zener diode ZD1 and a zener diode ZD2 are eliminated, a zener diode ZD2 is connected in series between the second input end and D2, the negative electrode of the zener diode ZD2 is connected with the second input end, the positive electrode of the zener diode ZD2 is connected with the input end of D2, a zener diode ZD4 is connected in series between the second input end and D4, the positive electrode of the zener diode ZD4 is connected with the second input end, and the negative electrode of the zener diode ZD4 is connected with the output end of D4.

According to the further technical scheme, on the basis of keeping a voltage stabilizing diode ZD1 and a voltage stabilizing diode ZD2, a voltage stabilizing diode ZD2 is connected in series between the second input end and D2, the negative electrode of the voltage stabilizing diode ZD2 is connected with the second input end, the positive electrode of a voltage stabilizing diode ZD2 is connected with the input end of D2, a voltage stabilizing diode ZD4 is connected in series between the second input end and D4, the positive electrode of a voltage stabilizing diode ZD4 is connected with the second input end, and the negative electrode of the voltage stabilizing diode ZD4 is connected with the output end of D4.

An anti-interference LED protection circuit comprises a full-wave rectification circuit and an LED, wherein the full-wave rectification circuit comprises D1, D2, D3 and D4, the full-wave rectification circuit is further provided with a first input end, a second input end, an anode output end and a cathode output end, the input end of the LED is connected with the anode output end, the output end of the LED is connected with the cathode output end, the input end of D1 is connected with the first input end, the output end of D1 is connected with the anode output end, the input end of D2 is connected with the second input end, the output end of D2 is connected with the anode output end, the output end of D3 is connected with the first input end, the input end of D3 is connected with the cathode output end, the output end of D4 is connected with the second input end, the input end of D4 is connected with the cathode output end, the full-wave LED protection circuit further comprises a voltage stabilizing diode ZD1 and a voltage stabilizing diode ZD2, the, the cathode of the voltage stabilizing diode is connected with the input end of a first external circuit, the second input end of the voltage stabilizing diode is connected with the anode of the voltage stabilizing diode ZD2, and the cathode of the voltage stabilizing diode ZD2 is connected with the input end of a second external circuit.

The utility model has the advantages that:

the utility model provides an anti-interference LED protection circuit, the zener diode that sets up in the circuit, only reach certain voltage and just enable the circuit and switch on, prevented because of the surplus low-voltage that energy storage components and parts discharged the production to and electromagnetic wave interference makes LED be in the condition of bright indicating state a little, thereby avoided the data of need artificial judgement to cause the condition of erroneous judgement.

Drawings

FIG. 1: the utility model discloses a first embodiment circuit diagram.

FIG. 2: the circuit diagram of the second embodiment of the present invention.

FIG. 3: the third embodiment of the present invention is a circuit diagram.

Detailed Description

The technical solution of the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings,

referring to fig. 1-3 of the drawings,

embodiment one is as shown in fig. 1, an anti-interference LED protection circuit includes a full-wave rectification circuit 1 and an LED, where the full-wave rectification circuit 1 includes D1, D2, D3 and D4, the full-wave rectification circuit further includes a first input terminal 11, a second input terminal 12, a positive output terminal 13 and a negative output terminal 14, an input terminal of the LED is connected to the positive output terminal 13, an output terminal of the LED is connected to the negative output terminal 14, an input terminal of D1 is connected to the first input terminal 11, an output terminal of D1 is connected to the positive output terminal 13, an input terminal of D2 is connected to the second input terminal 12, an output terminal of D2 is connected to the positive output terminal 13, an output terminal of D3 is connected to the first input terminal 11, an input terminal of D3 is connected to the negative output terminal 14, an output terminal of D4 is connected to the second input terminal 12, and an input terminal of D4 is connected to the negative output terminal, at least one voltage stabilizing diode ZD1 is connected in series between the input end of the LED and the anode output end 13, the cathode of the voltage stabilizing diode ZD1 is connected with the anode output end 13, and the anode of the voltage stabilizing diode ZD1 is connected with the LED input end.

The circuit arrangement shown in fig. 1 may be an alternating current or a direct current, when the first input terminal 11 is a positive electrode and the second input terminal 12 is a negative electrode, the current passes through D1, the positive output terminal 13, and the zener diode ZD1, when the passing voltage is lower than the breakdown voltage of the zener diode ZD1, the circuit is turned off and is not turned on, the LED (the input terminal of the LED is a positive electrode and the output terminal is a negative electrode) is not turned on, when the passing voltage is higher than the breakdown voltage of the zener diode ZD1, the zener diode ZD1 is turned on by breakdown, the current passes through the LED, the negative output terminal, and D4 in sequence, and finally the current flows out through the second input terminal 12 to form a path to turn on the LED,

when the second input end 12 is a positive electrode and the first input end 11 is a negative electrode, the current firstly passes through D2, then passes through the positive electrode output end 13, and then passes through the zener diode ZD1, when the passing voltage is lower than the breakdown voltage of the zener diode ZD1, the circuit is turned off and is not turned on, the LED (the input end of the LED is a positive electrode and the output end is a negative electrode) is not turned on, when the passing voltage is higher than the breakdown voltage of the zener diode ZD1, the zener diode ZD1 is turned on by breakdown, then the current passes through the LED, the negative electrode output end and the D3 in sequence, and finally the current flows out through the first input end 11 to form a path to.

The circuit arrangement shown in fig. 1 may be an alternating current or a direct current, when the first input terminal 11 is a positive electrode and the second input terminal 12 is a negative electrode, the current passes through D1, the positive output terminal 13, the zener diode ZD1, when the passing voltage is lower than the breakdown voltage of the zener diode ZD1, the circuit is turned off and is not turned on, the LED (the input terminal of the LED is a positive electrode and the output terminal is a negative electrode) is not lit, when the passing voltage is higher than the breakdown voltage of the zener diode ZD1, the zener diode ZD1 is turned on by breakdown, the current passes through the zener diode ZD2, when the passing voltage is lower than the breakdown voltage of the zener diode ZD2, the circuit is turned off and is not turned on, when the passing voltage is higher than the breakdown voltage of the zener diode ZD2, the zener diode ZD2 is turned on by breakdown, the current passes through the LED, the negative output terminal and the D4 in turn, and finally the current flows out through the second input terminal 12 to form a path,

when the second input end 12 is a positive electrode and the first input end 11 is a negative electrode, the current firstly passes through D2, then passes through a positive electrode output end 13, and then passes through a zener diode ZD1, when the passing voltage is lower than the breakdown voltage of the zener diode ZD1, the circuit is turned off and is not turned on, the LED (the input end of the LED is a positive electrode and the output end is a negative electrode) is not turned on, when the passing voltage is higher than the breakdown voltage of the zener diode ZD1, the zener diode ZD1 is turned on in a breakdown manner, then the current passes through the zener diode ZD2, when the passing voltage is lower than the breakdown voltage of the zener diode 2, the circuit is turned off and is not turned on, the LED is not turned on, when the passing voltage is higher than the breakdown voltage of the zener diode 2, the zener diode ZD2 is turned on in a breakdown manner, then the current passes through the LED, the negative electrode output end and.

The circuit of the scheme is provided with the two voltage stabilizing diodes which are connected in series, so that the situation that the voltage is too large when the energy storage component discharges, the voltage stabilizing diodes are broken down, and the anti-interference performance is lost is prevented.

Second embodiment as shown in fig. 2, an anti-interference LED protection circuit includes a full-wave rectification circuit 1 and an LED, where the full-wave rectification circuit 1 includes D1, D2, D3 and D4, the full-wave rectification circuit further includes a first input terminal 11, a second input terminal 12, a positive output terminal 13 and a negative output terminal 14, an input terminal of the LED is connected to the positive output terminal 13, an output terminal of the LED is connected to the negative output terminal 14, an input terminal of D1 is connected to the first input terminal 11, an output terminal of D1 is connected to the positive output terminal 13, an input terminal of D2 is connected to the second input terminal 12, an output terminal of D2 is connected to the positive output terminal 13, an output terminal of D3 is connected to the first input terminal 11, an input terminal of D3 is connected to the negative output terminal 14, an output terminal of D4 is connected to the second input terminal 12, and an input terminal of D4 is connected to the negative output terminal 14, a zener diode ZD1 is connected in series between the first input end 11 and D1, the negative electrode of the zener diode ZD1 is connected to the first input end 11, the positive electrode of the zener diode ZD1 is connected to the input end of D1, a zener diode ZD3 is connected in series between the first input end 11 and D3, the positive electrode of the zener diode ZD3 is connected to the first input end 11, and the negative electrode of the zener diode ZD3 is connected to the output end of D3.

The circuit arrangement shown in fig. 2 may be an alternating current or a direct current, when the first input terminal 11 is a positive electrode and the second input terminal 12 is a negative electrode, the current firstly passes through the zener diode ZD1, when the passing voltage is lower than the breakdown voltage of the zener diode ZD1, the circuit is turned off and is not turned on, the LED (the input terminal of the LED is the positive electrode and the output terminal is the negative electrode) is not lit, when the passing voltage is higher than the breakdown voltage of the zener diode ZD1, the zener diode ZD1 is turned on by breakdown, then the current passes through the D1, the positive output terminal 13, the LED, the negative output terminal 14 and the D4 in sequence, and finally the current flows out through the second input terminal 12 to form a path to light the LED,

when the second input end 12 is a positive electrode and the first input end 11 is a negative electrode, the current sequentially passes through D2, a positive electrode output end, an LED (the input end of the LED is a positive electrode, the output end is a negative electrode), a negative electrode output end and D3, when the current passes through the zener diode ZD3, the voltage is lower than the voltage of breakdown of the zener diode ZD3, the circuit is cut off and is not conducted, the LED is not lighted, when the voltage is higher than the voltage of breakdown of the zener diode ZD3, the zener diode ZD3 is broken through and is conducted, and finally, the current flows out through the first input end 11 to form a path to light the LED.

According to the further technical scheme, a zener diode ZD1 and a zener diode ZD2 are eliminated, a zener diode ZD2 is connected in series between the second input end 12 and D2, the cathode of the zener diode ZD2 is connected with the second input end 12, the anode of the zener diode ZD2 is connected with the input end of D2, a zener diode ZD4 is connected in series between the second input end 12 and D4, the anode of the zener diode ZD4 is connected with the second input end 12, and the cathode of the zener diode ZD4 is connected with the output end of D4.

The circuit arrangement shown in fig. 2 may be an alternating current or a direct current, when the first input terminal 11 is a positive terminal and the second input terminal 12 is a negative terminal, the current passes through D1, a positive terminal, an LED (the input terminal of the LED is a positive terminal and the output terminal is a negative terminal), a negative terminal, and D4 in sequence, when the current passes through the zener diode ZD4, the voltage is lower than the breakdown voltage of the zener diode ZD4, the circuit is turned off and is not turned on, the LED is not turned on, when the voltage is higher than the breakdown voltage of the zener diode ZD4, the zener diode ZD4 is turned on by breakdown, and finally the current flows out through the second input terminal 12 to form a path to turn on the LED,

when the second input end 12 is a positive electrode and the first input end 11 is a negative electrode, the current firstly passes through the zener diode ZD2, when the passing voltage is lower than the breakdown voltage of the zener diode ZD2, the circuit is turned off and is not conducted, the LED (the input end of the LED is a positive electrode and the output end is a negative electrode) is not lit, when the passing voltage is higher than the breakdown voltage of the zener diode ZD2, the zener diode ZD2 is broken and is conducted, then the current sequentially passes through the D2, the positive electrode output end 13, the LED, the negative electrode output end 14 and the D3, and finally the current flows out through the first input end 11 to form a path to light the LED.

According to the further technical scheme, on the basis of keeping a voltage stabilizing diode ZD1 and a voltage stabilizing diode ZD2, a voltage stabilizing diode ZD2 is connected in series between the second input end 12 and D2, the negative electrode of the voltage stabilizing diode ZD2 is connected with the second input end 12, the positive electrode of the voltage stabilizing diode ZD2 is connected with the input end of D2, a voltage stabilizing diode ZD4 is connected in series between the second input end 12 and D4, the positive electrode of the voltage stabilizing diode ZD4 is connected with the second input end 12, and the negative electrode of the voltage stabilizing diode ZD4 is connected with the output end of D4.

The circuit arrangement shown in fig. 2 may be an alternating current or a direct current, when the first input terminal 11 is a positive terminal and the second input terminal 12 is a negative terminal, the current passes through the zener diode ZD1, when the voltage passed through is lower than the breakdown voltage of the zener diode ZD1, the circuit is turned off and is not turned on, the LED (the input terminal of the LED is the positive terminal and the output terminal is the negative terminal) is not lit, when the voltage is higher than the breakdown voltage of the zener diode ZD1, the zener diode ZD1 is turned on, then the current passes through the D1, the positive output terminal 12, the LED, the negative output terminal 14 and the D4 in sequence, when the voltage is lower than the breakdown voltage of the zener diode ZD4 when the current passes through the zener diode ZD4, the circuit is turned off and is not turned on, when the voltage is higher than the breakdown voltage of the zener diode ZD4, the zener diode ZD4 is turned on, and finally the current flows out through the second input terminal 12 to form a path to light the,

when the second input end 12 is a positive electrode and the first input end 11 is a negative electrode, the current firstly passes through the zener diode ZD2, when the passing voltage is lower than the breakdown voltage of the zener diode ZD2, the circuit is turned off and not conducted, the LED (the input end of the LED is a positive electrode and the output end of the LED is a negative electrode) is not lit, when the voltage is higher than the breakdown voltage of the zener diode ZD2, the zener diode ZD2 is turned on by breakdown, then the current passes through the D2, the positive output end 12, the LED, the negative output end 14 and the D3 in sequence, when the current passes through the zener diode ZD3, the voltage is lower than the breakdown voltage of the zener diode ZD3, the circuit is turned off and not conducted, the LED is not lit, when the voltage is higher than the breakdown voltage of the zener diode ZD3, the zener diode ZD3 is turned on by breakdown, and finally the current flows out through the first.

Third embodiment as shown in fig. 3, an anti-interference LED protection circuit includes a full-wave rectification circuit 1 and an LED, where the full-wave rectification circuit 1 includes D1, D2, D3 and D4, the full-wave rectification circuit further includes a first input terminal 11, a second input terminal 12, a positive output terminal 13 and a negative output terminal 14, an input terminal of the LED is connected to the positive output terminal 13, an output terminal of the LED is connected to the negative output terminal 14, an input terminal of D1 is connected to the first input terminal 11, an output terminal of D1 is connected to the positive output terminal 13, an input terminal of D2 is connected to the second input terminal 12, an output terminal of D2 is connected to the positive output terminal 13, an output terminal of D3 is connected to the first input terminal 11, an input terminal of D3 is connected to the negative output terminal 14, an output terminal of D4 is connected to the second input terminal 12, and an input terminal of D4 is connected to the negative output terminal 14, the voltage stabilizing circuit further comprises a voltage stabilizing diode ZD1 and a voltage stabilizing diode ZD2, wherein the first input end 11 is connected with the positive pole of the voltage stabilizing diode ZD1, the negative pole of the voltage stabilizing diode is connected with the first external circuit input end 2, the second input end 12 is connected with the positive pole of the voltage stabilizing diode ZD2, and the negative pole of the voltage stabilizing diode ZD2 is connected with the second external circuit input end.

The circuit arrangement shown in fig. 3 may be an alternating current or a direct current, when the first external circuit input terminal 2 is a positive electrode and the second external circuit input terminal 3 is a negative electrode, the current passes through the zener diode ZD1, when the passing voltage is lower than the breakdown voltage of the zener diode ZD1, the circuit is turned off and is not turned on, the LED (the input terminal of the LED is a positive electrode and the output terminal is a negative electrode) is not lit, when the voltage is higher than the breakdown voltage of the zener diode ZD1, the zener diode ZD1 is turned on by breakdown, then the current passes through the first input terminal 11, D1, the positive output terminal 13, the LED, the negative output terminal, D4, and the second input terminal 12 in sequence, since the zener diode ZD2 is arranged in the positive direction of the current, which is equivalent to a common diode, and has no turn-off function, finally the current flows through the zener diode 2 to the second external circuit input terminal 3 to form a loop,

when the input end of the second external circuit is the anode 3 and the input end 2 of the first external circuit is the cathode, the current firstly passes through the zener diode ZD2, when the passing voltage is lower than the breakdown voltage of the zener diode ZD2, the circuit is turned off and not conducted, the LED (the input end of the LED is the anode and the output end is the cathode) is not lit, when the voltage is higher than the breakdown voltage of the zener diode ZD2, the zener diode ZD2 is turned on by breakdown, then the current passes through the second input end 12, D2, the anode output end 13, the LED, the cathode output end, D3 and the first input end 11 in sequence, because the zener diode ZD1 is arranged along the positive direction of the current, which is equivalent to a common diode, and has no cutoff effect, and finally the current flows to the input end 2 of the first external circuit through the zener diode 1 to form a.

The utility model provides an anti-interference LED protection circuit can know according to above-mentioned three embodiment, and the zener diode that sets up in the circuit only reaches certain voltage and just enables the circuit and switch on, has prevented to discharge the surplus low-voltage that produces because of energy storage components and parts to and electromagnetic wave interference makes LED be in little bright indicating state, thereby has avoided the data that need artificially judge to cause the condition of erroneous judgement.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may include only a single embodiment, and such description is for clarity only, and those skilled in the art will be able to make the description as a whole, and the embodiments may be appropriately combined to form other embodiments as will be apparent to those skilled in the art.

Claims

1. An anti-interference LED protection circuit is characterized by comprising a full-wave rectification circuit and an LED, wherein the full-wave rectification circuit comprises D1, D2, D3 and D4, the full-wave rectification circuit is further provided with a first input end, a second input end, an anode output end and a cathode output end, the input end of the LED is connected with the anode output end, the output end of the LED is connected with the cathode output end, the input end of D1 is connected with the first input end, the output end of D1 is connected with the anode output end, the input end of D2 is connected with the second input end, the output end of D2 is connected with the anode output end, the output end of D3 is connected with the first input end, the input end of D3 is connected with the cathode output end, the output end of D4 is connected with the second input end, the input end of D4 is connected with the cathode output end, at least one voltage stabilizing diode ZD1 is connected between the input end of the LED and the, the cathode of the voltage-stabilizing diode ZD1 is connected with the anode output end, and the anode of the voltage-stabilizing diode ZD1 is connected with the LED input end.

2. The anti-interference LED protection circuit according to claim 1, wherein the number of the Zener diodes is two, and the Zener diodes comprise a Zener diode ZD1 and a Zener diode ZD2, the Zener diode ZD1 is connected with the Zener diode ZD2 end to end, and the anode of the Zener diode ZD2 is connected with the LED input terminal.

3. An anti-interference LED protection circuit is characterized by comprising a full-wave rectification circuit and an LED, wherein the full-wave rectification circuit comprises D1, D2, D3 and D4, the full-wave rectification circuit is further provided with a first input end, a second input end, an anode output end and a cathode output end, the input end of the LED is connected with the anode output end, the output end of the LED is connected with the cathode output end, the input end of D1 is connected with the first input end, the output end of D1 is connected with the anode output end, the input end of D2 is connected with the second input end, the output end of D2 is connected with the anode output end, the output end of D3 is connected with the first input end, the input end of D3 is connected with the cathode output end, the output end of D4 is connected with the second input end, the input end of D4 is connected with the cathode output end, a voltage stabilizing diode ZD1 is connected between the first input end and D1, the cathode of the voltage stabilizing diode ZD1 is connected with a first input end, the anode of the voltage stabilizing diode ZD1 is connected with the input end of D1, a voltage stabilizing diode ZD3 is connected in series between the first input end and D3, the anode of the voltage stabilizing diode ZD3 is connected with the first input end, and the cathode of the voltage stabilizing diode ZD3 is connected with the output end of D3.

4. The anti-interference LED protection circuit according to claim 3, wherein a Zener diode ZD1 and a Zener diode ZD2 are eliminated, a Zener diode ZD2 is connected in series between the second input terminal and D2, the cathode of the Zener diode ZD2 is connected with the second input terminal, the anode of the Zener diode ZD2 is connected with the input terminal of D2, a Zener diode ZD4 is connected in series between the second input terminal and D4, the anode of the Zener diode ZD4 is connected with the second input terminal, and the cathode of the Zener diode ZD4 is connected with the output terminal of D4.

5. The anti-interference LED protection circuit according to claim 3, wherein on the basis of a voltage regulator diode ZD1 and a voltage regulator diode ZD2, a voltage regulator diode ZD2 is connected in series between the second input end and D2, the cathode of the voltage regulator diode ZD2 is connected with the second input end, the anode of the voltage regulator diode ZD2 is connected with the input end of D2, a voltage regulator diode ZD4 is connected in series between the second input end and D4, the anode of the voltage regulator diode ZD4 is connected with the second input end, and the cathode of the voltage regulator diode ZD4 is connected with the output end of D4.

6. An anti-interference LED protection circuit is characterized by comprising a full-wave rectification circuit and an LED, wherein the full-wave rectification circuit comprises D1, D2, D3 and D4, the full-wave rectification circuit is further provided with a first input end, a second input end, an anode output end and a cathode output end, the input end of the LED is connected with the anode output end, the output end of the LED is connected with the cathode output end, the input end of D1 is connected with the first input end, the output end of D1 is connected with the anode output end, the input end of D2 is connected with the second input end, the output end of D2 is connected with the anode output end, the output end of D3 is connected with the first input end, the input end of D3 is connected with the cathode output end, the output end of D4 is connected with the second input end, the input end of D4 is connected with the cathode output end, the LED protection circuit further comprises a voltage stabilizing diode ZD1 and, the first input end is connected with the anode of a voltage stabilizing diode ZD1, the cathode of the voltage stabilizing diode is connected with the input end of a first external circuit, the second input end is connected with the anode of a voltage stabilizing diode ZD2, and the cathode of the voltage stabilizing diode ZD2 is connected with the input end of a second external circuit.