Circuit for eliminating afterglow of non-isolated power supply

Abstract

The utility model relates to a circuit for eliminating afterglow of a non-isolated power supply, which comprises a non-isolated LED driving power supply and an LED lamp, and is characterized in that a unilateral diode D1 is connected between the Vout + end of the non-isolated LED driving power supply and the LED + end of the LED lamp; the Vout-end of the non-isolated LED driving power supply is connected with the positive electrode of a Zener diode ZD1, a resistor R1 and the source electrode of an MOS tube, the grid electrode of the MOS tube is connected with the negative electrode of the Zener diode ZD1 and the resistor R1, and the drain electrode of the MOS tube is connected with the LED-end of the LED lamp. A CV control module is connected between the Vout + end of the non-isolated LED driving power supply and the negative electrode of the Zener diode ZD1, and the CV control module is formed by connecting a resistor and a Zener diode in series. An afterglow-removing turn-off circuit is formed by the CV control module, the ZD1, the R1, the MOS tubes Q1 and D1 and the like, after a power supply is cut off, charges on the capacitor detect the circuit to conduct the MOSQ1 through the voltage-stabilizing CV control module so as to lower the voltage of the afterglow-removing turn-off circuit, then the controlled LED lamp is turned off, and the whole set of circuit is simple and practical in structure.

Description

Technical Field

[0001] The utility model relates to the technical field of LED lighting, in particular to a circuit for eliminating afterglow of a non-isolated power supply. Background Art

[0002] Non-isolated power is a power supply with direct electrical connection between the input and load ends and no physical isolation. It is widely used in LED lamps due to its high cost-effectiveness and high efficiency. When the non-isolated LED lighting power supply is turned off, that is, when the dimming signal of the non-isolated power supply is 0, the power supply has no output, but due to the junction capacitance (parasitic capacitance) between the copper foil of the aluminum substrate and the ground wire, the lamp beads appear slightly bright, resulting in a certain period of afterglow after power failure. The afterglow phenomenon may be covered up under normal light, but it is very obvious after turning off the light in a dim environment.

[0003] China Patent Publication (Announcement) No.: CN218830718U, Patent Title: A Shutdown Afterglow Elimination Circuit and LED Driving Power Supply, which discloses "

[0016] When the 0-10V driver of the utility model outputs a shutdown voltage, the voltage of the shutdown voltage gradually decreases, so that the voltage drop on the voltage-dividing control circuit is reduced to the point where the voltage-dividing control circuit is disconnected, and the voltage drop on the shutdown signal control circuit is increased and turned on, and the conduction of the shutdown signal control circuit will lower the voltage of the afterglow shutdown circuit, thereby disconnecting the afterglow shutdown circuit and shutting down the controlled lamp, thereby ensuring that there is no connection between the controlled lamp and the 0-10V driver, thereby disconnecting the loop formed by the parasitic parameters of the controlled lamp, and achieving complete shutdown", thereby avoiding the generation of ghost lights and the occurrence of lamp afterglow.

[0004] However, its shutdown afterglow elimination circuit 100 includes a voltage divider control circuit 110, a shutdown signal control circuit 120 and an afterglow shutdown circuit 130, which is relatively complex, and the overall circuit structure can be further simplified. Summary of the invention

[0005] The utility model aims to provide a circuit for eliminating afterglow of a non-isolated power supply, so as to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the utility model is achieved through the following technical measures: a circuit for eliminating the afterglow of a non-isolated power supply, comprising a non-isolated LED driving power supply as a power supply, and an LED lamp as an electrical appliance, wherein a unidirectional diode D1 is connected between the Vout+ end of the non-isolated LED driving power supply and the LED+ end of the LED lamp; the positive electrode of a voltage-stabilizing diode ZD1, a resistor R1 and the source of a MOS tube are respectively connected to the Vout- end of the non-isolated LED driving power supply, the gate of the MOS tube is connected to the negative electrode of the voltage-stabilizing diode ZD1 and the resistor R1, and the drain of the MOS tube is connected to the LED- end of the LED lamp; a CV control module is connected between the Vout+ end of the non-isolated LED driving power supply and the negative electrode of the voltage-stabilizing diode ZD1, and the CV control module is composed of a resistor and a voltage-stabilizing diode connected in series.

[0007] Compared with the prior art, the utility model has the advantages that: the afterglow-removing shutdown circuit is composed of a CV control module, ZD1, R1, MOS tube Q1, D1, etc. When the power is cut off, the charge on the capacitor turns on MOS Q1 through the voltage-stabilizing CV control module detection circuit to lower the voltage of the afterglow shutdown circuit, thereby turning off the controlled LED lamp. The whole circuit structure is simple and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0009] In the attached picture:

[0010] Figure 1 This is a circuit diagram for eliminating afterglow of a non-isolated power supply according to the utility model.

[0011] Figure 2 This is the internal circuit diagram of the CV control module described in the utility model. DETAILED DESCRIPTION

[0012] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0013] Example 1

[0014] Please refer to Figure 1-2The present embodiment provides a circuit for eliminating afterglow of a non-isolated power supply, comprising a non-isolated LED driving power supply as a power supply, and an LED lamp as an electrical appliance, wherein a unidirectional diode D1 is connected between the Vout+ terminal of the non-isolated LED driving power supply and the LED+ terminal of the LED lamp; the positive electrode of a voltage stabilizing diode ZD1, a resistor R1 and a source electrode of a MOS tube are respectively connected to the Vout- terminal of the non-isolated LED driving power supply, the gate electrode of the MOS tube is connected to the negative electrode of the voltage stabilizing diode ZD1 and the resistor R1, and the drain electrode of the MOS tube is connected to the LED- terminal of the LED lamp; and a CV control module is connected between the Vout+ terminal of the non-isolated LED driving power supply and the negative electrode of the voltage stabilizing diode ZD1.

[0015] In the embodiments of the present utility model application, please refer to Figure 2 The CV control module is composed of a resistor and a voltage stabilizing diode connected in series. The resistors and the voltage stabilizing diodes are paired one by one, and two sets, three sets or N sets are selected for use according to actual work needs.

[0016] The present embodiment provides a non-isolated power supply afterglow elimination circuit. During normal operation, the afterglow elimination shutdown circuit is composed of a CV control module, ZD1, R1, MOS tubes Q1, D1, etc. When the power is cut off, the charge on the capacitor turns on MOS Q1 through the voltage stabilizing CV control module detection circuit to lower the voltage of the afterglow shutdown circuit, thereby shutting off the controlled LED lamp. The entire circuit structure is simple and practical.

[0017] The beneficial effects of the utility model are as follows: compared with the prior art, the whole circuit structure is simple and practical.

[0018] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A circuit for eliminating afterglow of a non-isolated power supply, comprising a non-isolated LED driving power supply as a power supply, and an LED lamp as an electrical appliance, characterized in that: A unidirectional diode D1 is connected between the Vout+ end of the non-isolated LED driving power supply and the LED+ end of the LED lamp; the positive electrode of the voltage zener diode ZD1, the resistor R1 and the source of the MOS tube are respectively connected to the Vout- end of the non-isolated LED driving power supply, the gate of the MOS tube is connected to the negative electrode of the voltage zener diode ZD1 and the resistor R1, and the drain of the MOS tube is connected to the LED- end of the LED lamp; a CV control module is connected between the Vout+ end of the non-isolated LED driving power supply and the negative electrode of the voltage zener diode ZD1, and the CV control module is composed of a resistor and a voltage zener diode connected in series.

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