CN221103603U - Non-afterglow non-isolated power supply with relay cut-off output - Google Patents

Abstract

The utility model discloses a non-afterglow non-isolated power supply which is cut off and output by using a relay, and belongs to the technical field of non-isolated power supplies. According to the utility model, the relay is added at the output end, the relay control circuit is used for controlling the on-off of the relay through the dimming plate to control the LED lamp, when the LED lamp needs to be turned off, the current loop of the lamp bead can be thoroughly disconnected, afterglow is eliminated, the effect of complete turn-off is achieved, and the LED lamp has the advantages of fewer used elements, smaller size, higher efficiency and higher cost.

Description

Non-afterglow non-isolated power supply with relay cut-off output

Technical Field

The utility model belongs to the technical field of non-isolated power supplies, and relates to a non-afterglow non-isolated power supply which uses a relay to cut off output.

Background

The traditional non-isolated LED power supply has been widely used because of the characteristics of relatively simple structure, high efficiency, small volume, relatively low cost and the like, but because of the non-isolation between the input and the output, when the lamp beads are required to be completely turned off, a current loop still exists between the power supply and the lamp beads, the LED lamp is still in a micro-bright state, afterglow is formed, and the effect of completely turning off cannot be achieved.

Disclosure of utility model

The utility model provides a relay for cutting off an output non-afterglow non-isolated power supply, which aims at solving the problems in the background technology.

In order to achieve the above purpose, the utility model provides a relay-cut-off output non-afterglow non-isolated power supply, which comprises an AC input part, a rectifier bridge, a PFC boost circuit, a BUCK BUCK circuit, a relay and an LED lamp which are electrically connected in sequence, wherein one end of the relay is connected with a relay control circuit, one end of the relay control circuit is connected with a dimming board, one end of the BUCK BUCK circuit is connected with an optocoupler circuit, the output end of the PFC boost circuit is connected with an auxiliary power supply, and the dimming board is connected with the auxiliary power supply and the optocoupler circuit.

Preferably, the relay control circuit comprises an optocoupler U2, a third transistor Q1, a resistor R2, a resistor R4 and a resistor R5, wherein two ends of the optocoupler U2 are respectively connected with the resistor R2 and the resistor R4, a base electrode of the third transistor Q1 is connected with the resistor R4 and the resistor R5, an emitting electrode of the third transistor Q1 is connected with the other end of the resistor R5, a collecting electrode of the third transistor Q1 is connected with the relay through the resistor R1, and the other end of the resistor R2 is connected with a pin 5 of the light modulation plate.

Preferably, one end of the optocoupler U2 is connected to the pin 2 of the auxiliary power supply.

Preferably, the optocoupler circuit comprises an optocoupler U1 and a resistor R3, wherein the resistor R3 is connected with the pin 3 of the dimming board, the other end of the resistor R3 is connected with the optocoupler U1, one end of the optocoupler U1 is connected with the pin 5 of the BUCK step-down circuit, and the other end of the optocoupler U1 is grounded.

Preferably, the supply voltage of the auxiliary power supply is 12V, the pin 5 of the auxiliary power supply is connected with the pin 2 of the dimming board, and the pin 1 of the auxiliary power supply is connected with the pin 3 of the PFC boost circuit.

Compared with the prior art, the utility model has the beneficial effects that:

1. The relay is added at the output end, the relay control circuit is used for controlling the on-off of the relay through the light modulation plate, the control of the power output of the AC input part to the LED lamp can be cut off, when the LED lamp needs to be turned off, the current loop of the lamp bead can be thoroughly cut off, the afterglow is eliminated, the effect of complete turn-off is achieved, the non-isolated power supply can also realize no afterglow, and the defect that no afterglow can be realized only without depending on the isolated power supply is achieved.

2. The non-isolated power supply is realized, the LED lamp can be turned off, turned off and not afterglow, the non-isolated power supply can be realized like an isolated power supply by adopting basic elements, and the non-isolated power supply has the advantages of fewer elements, smaller size, higher efficiency and higher cost.

In order to more clearly illustrate the structural features and efficacy of the present utility model, the present utility model will be described in detail below with reference to the accompanying drawings and examples.

Drawings

FIG. 1 is a schematic circuit diagram of the present utility model;

reference numerals:

1. An AC input section; 2. a rectifier bridge; 3. a PFC boost circuit; 4. a BUCK circuit; 5. a relay; 6. an LED lamp; 7. a relay control circuit; 8. a light modulating plate; 9. an optocoupler circuit; 10. and an auxiliary power supply.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the applications herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

To achieve the above objective, an embodiment of the present utility model provides a non-afterglow non-isolated power supply using a relay to cut off output, which is shown in fig. 1, and includes an AC input part 1, a rectifier bridge 2, a PFC boost circuit 3, a BUCK boost circuit 4, a relay 5 and an LED lamp 6 electrically connected in sequence, one end of the relay 5 is connected with a relay control circuit 7, one end of the relay control circuit 7 is connected with a dimming board 8, one end of the BUCK boost circuit 4 is connected with an optocoupler circuit 9, an auxiliary power supply 10 is connected with an output end of the PFC boost circuit 3, and the dimming board 8 is connected with the auxiliary power supply 10 and the optocoupler circuit 9.

Specifically, the relay control circuit 7 includes an optocoupler U2, a third transistor Q1, a resistor R2, a resistor R4, and a resistor R5, two ends of the optocoupler U2 are connected with the resistor R2 and the resistor R4, respectively, a base electrode of the third transistor Q1 is connected with the resistor R4 and the resistor R5, an emitter electrode of the third transistor Q1 is connected with the other end of the resistor R5, a collector electrode of the third transistor Q1 is connected with the relay 5 through the resistor R1, and the other end of the resistor R2 is connected with a pin 5 of the dimming board 8.

Specifically, one end of the optocoupler U2 is connected to the pin 2 of the auxiliary power supply 10.

Specifically, the optocoupler circuit 9 includes an optocoupler U1 and a resistor R3, the resistor R3 is connected to the pin 3 of the dimming board 8, the optocoupler U1 is connected to the other end of the resistor R3, one end of the optocoupler U1 is connected to the pin 5 of the BUCK circuit 4, and the other end is grounded.

Specifically, the power supply voltage of the auxiliary power supply 10 is 12V, the pin 5 of the auxiliary power supply 10 is connected to the pin 2 of the dimming board 8, and the pin 1 of the auxiliary power supply 10 is connected to the pin 3 of the PFC boost circuit 3.

In this embodiment, the AC input unit 1 is externally connected with an external power supply through the set AC input unit, the rectifier bridge 2 rectifies the input AC into dc, the PFC boost circuit 3 stabilizes the rectified voltage at a set value (for example, 420V), the BUCK circuit 4 adjusts the voltage and the current to the voltage parameter and the current parameter required by the LED lamp 6, the relay 5 is in a conductive state during normal operation, and is in an off state during the off state of the LED lamp 6, so that the LED lamp 6 has no afterglow. The brightness of the LED lamp 6 is controlled by the dimming board 8 through receiving an externally incoming dimming signal, the relay 5 control circuit is used for controlling the on and off of the relay 5 through the signal given by the dimming board, the dimming signal is transmitted to the BUCK step-down circuit 4 through the optocoupler U1 and used for adjusting the brightness of the LED lamp 6, and the auxiliary power supply 10 adopts 12V voltage to provide power supply for the dimming board 8 and the relay 5.

In one embodiment, it is assumed that there is no relay 5: since the product needs to be grounded and the input and output are not isolated, even if the positive and negative voltage of the power supply is reduced to 0V, the commercial power is input through AC-L, AC-N and passes through the LED lamp 6, and then passes through the CY1, CY2 and CY3 to form a loop, so that the LED lamp 6 is slightly bright to form afterglow. Relay 5 is added: after the relay 5 is added, in normal operation, the I/O port of the dimming board 8 outputs high level, so that the transistor Q1 is conducted, the relay 5 is closed, and the LED lamp 6 is lighted; when the LED lamp 6 is required to be turned off, the I/O port of the dimming plate 8 outputs low level, the three-stage tube Q1 is cut off, the relay 5 is disconnected, and although the LED lamp 6 is connected to the ground through CY2, the LED lamp 6 and the AC-L, AC-N are thoroughly cut off due to the disconnection of the relay 5, no loop is formed, and the afterglow of the LED lamp 6 is eliminated.

The relay 5 is closed: the I/O port of the light modulation plate 8 outputs high level, the optocoupler U2 starts to work, the transistor Q1 is conducted, the relay 5 is closed, the AC input part can normally output, the LED lamp 6 is on, and the product works normally.

The relay 5 is opened: the I/O port of the light adjusting plate 8 outputs low level, the optocoupler U2 does not work, the transistor Q1 is cut off, the relay 5 is disconnected, the anode and the cathode of the AC input part and the LED lamp 6 are thoroughly cut off, the LED lamp 6 is turned off, and no afterglow exists.

In summary, the utility model provides a relay for cutting off the output of non-afterglow non-isolated power supply, which is characterized in that a relay 5 is added at the output end, and the relay control circuit 7 is used for controlling the on-off of the relay 5 through a dimming plate 8, so that the control of the power supply output of an AC input part 1 to an LED lamp 6 can be cut off, when the LED lamp 6 needs to be turned off, the current loop of the LED lamp 6 can be thoroughly disconnected, the afterglow is eliminated, the effect of complete turn-off is achieved, the non-isolated power supply can also realize non-afterglow, and the defect of non-afterglow can be achieved without depending on the isolated power supply; the non-isolated power supply is realized, the LED lamp 6 can be turned off or turned off without afterglow, the non-isolated power supply can be realized like an isolated power supply by adopting basic elements, and the non-isolated power supply has the advantages of fewer elements, smaller size, higher efficiency and higher cost.

The technical principle of the present utility model has been described above in connection with specific embodiments, but is only the preferred embodiment of the present utility model. The protection scope of the present utility model is not limited to the above embodiments, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model. Those skilled in the art will recognize that other embodiments of the utility model are within the scope of the utility model without undue burden.

Claims (5)

1. The utility model provides a use relay to cut off output does not have non-isolated power supply of afterglow, its characterized in that, including AC input portion, rectifier bridge, PFC boost circuit, BUCK BUCK circuit, relay and the LED lamp of electric connection in proper order, relay's one end connection is equipped with relay control circuit, relay control circuit's one end connection is equipped with the light modulation board, BUCK BUCK circuit's one end connection is equipped with the opto-coupler circuit, PFC boost circuit's output connection is equipped with auxiliary power supply, light modulation board and auxiliary power supply, opto-coupler circuit are connected.

2. The relay cut-off output non-afterglow non-isolated power supply according to claim 1, wherein the relay control circuit comprises an optocoupler U2, a third transistor Q1, a resistor R2, a resistor R4 and a resistor R5, two ends of the optocoupler U2 are respectively connected with the resistor R2 and the resistor R4, a base electrode of the third transistor Q1 is connected with the resistor R4 and the resistor R5, an emitter electrode of the third transistor Q1 is connected with the other end of the resistor R5, a collector electrode of the third transistor Q1 is connected with the relay through the resistor R1, and the other end of the resistor R2 is connected with a pin 5 of a dimming plate.

3. The relay-off-output non-afterglow isolation power supply according to claim 2, wherein one end of the optocoupler U2 is connected with a foot 2 of an auxiliary power supply.

4. The relay-used cut-off output non-afterglow isolation power supply according to claim 1, wherein the optocoupler circuit comprises an optocoupler U1 and a resistor R3, the resistor R3 is connected with the pin 3 of the dimming board, the other end of the resistor R3 is connected with the optocoupler U1, one end of the optocoupler U1 is connected with the pin 5 of the BUCK step-down circuit, and the other end of the optocoupler U is grounded.

5. The non-isolated power supply of claim 1, wherein the auxiliary power supply has a supply voltage of 12V, the pin 5 of the auxiliary power supply is connected to the pin 2 of the dimmer plate, and the pin 1 of the auxiliary power supply is connected to the pin 3 of the PFC boost circuit.