Unlock instant, AI-driven research and patent intelligence for your innovation.

Multi-section switch step-down circuit, driving method thereof and LED lamp

A technology of step-down circuit and voltage detection circuit, which is applied in the circuit field, can solve the problems of low output voltage, low drive efficiency, and high performance requirements, and achieve the effects of low output current, high drive efficiency, and low circuit cost

Pending Publication Date: 2021-12-17
XIAMEN YANKON ENERGETIC LIGHTING CO LTD
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the principle of the step-down constant current switching power supply circuit is that the output voltage is lower than the input voltage, when the input voltage is lower than the output voltage, the IC does not work, and the LED is powered by the output electrolytic capacitor, which will cause no input current, resulting in harmonic Wave, therefore, the current step-down constant current switching power supply circuit with high PF (power factor) needs to make the output voltage relatively low in order to make the harmonics meet the requirements, so that the drive efficiency is also low, and the output voltage is lower The relatively low, to achieve the same power output, the output current will be relatively large, the performance requirements for inductors and MOS tubes and other devices are relatively high, and the cost is relatively high

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Multi-section switch step-down circuit, driving method thereof and LED lamp
  • Multi-section switch step-down circuit, driving method thereof and LED lamp
  • Multi-section switch step-down circuit, driving method thereof and LED lamp

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as Figure 1-3 As described above, a multi-stage switch step-down circuit includes a voltage detection circuit 11, a step-down constant current switching power supply circuit 12 and a light source selection circuit 13, and the voltage detection circuit 11 is used to detect the input of the step-down constant current switching power supply circuit 12 Voltage, the light source selection circuit 13 is used to select the first to the Mth group of light sources in the N group of light sources 14 in series according to the detection result of the voltage detection circuit 11, and connect them to the output end of the step-down constant current switching power supply circuit 12, and the step-down Type constant current switching power supply circuit 12 to drive, wherein, N≥2, M≤N, when M<N, the operating voltage of M groups of light sources connected in series≤the input voltage of step-down constant current switching power supply circuit 12≤M+ The operating voltage of one ...

Embodiment 2

[0046] The present invention also provides an LED lamp, which includes the multi-stage switch step-down circuit of Embodiment 1 and N groups of light sources, where the N groups of light sources are LED light sources.

Embodiment 3

[0048] The present invention also provides a driving method for a multi-stage switch step-down circuit. The multi-stage switch step-down circuit includes a step-down constant current switching power supply circuit including the following steps:

[0049] S1, detecting the input voltage of the step-down constant current switching power supply circuit;

[0050] S2, correspondingly increase or decrease the number of light source groups connected in series at the output end of the step-down constant current switching power supply circuit according to the detected rise and fall of the input voltage, and satisfy the requirement that the operating voltage of the series connected light source groups is not greater than that of the step-down constant current switch The input voltage of the power circuit. More specific reference can be made to the working process of Embodiment 1, which will not be described in detail here.

[0051] The invention not only meets the harmonic requirements,...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a multi-section switch step-down circuit, a driving method thereof and an LED lamp. The multi-section switch step-down circuit comprises a voltage detection circuit, a step-down type constant-current switch power supply circuit and a light source selection circuit; the voltage detection circuit is used for detecting the input voltage of the step-down type constant-current switch power supply circuit; the light source selection circuit is used for selecting the first to Mth groups of light sources in N groups of light sources according to the detection result of the voltage detection circuit, connecting the light sources in series and then connecting the light sources to the output end of the step-down constant-current switching power supply circuit, wherein N is greater than or equal to 2; when M is less than or equal to N, the input voltage of the step-down type constant-current switching power supply circuit is larger than or equal to the working voltage of the series-connected M groups of light sources and is smaller than or equal to the working voltage of the series-connected (M+ 1) groups of light sources; and when M is equal to N, the working voltage of the series-connected M groups of light sources is less than or equal to the input voltage of the step-down constant-current switching power supply circuit. According to the multi-section switch step-down circuit, the driving method thereof and the LED lamp of the invention, the harmonic wave requirement is met, the PF is high, the output voltage is not limited, the efficiency is high, the output current is low, the device type selection requirement is low, and the circuit cost is low.

Description

technical field [0001] The invention belongs to the technical field of circuits, and in particular relates to a multi-stage switch step-down circuit, a driving method thereof, and an LED lamp. Background technique [0002] LED (Light Emitting Diode), light-emitting diode, is a solid-state semiconductor device that can convert electrical energy into visible light, and it can directly convert electricity into light. Due to the advantages of high efficiency, energy saving, long life, and environmental protection, LED lamps have been more and more widely used in various places. [0003] When LED lamps are used, LED driving circuits are required for driving. The step-down constant current switching power supply circuit is a commonly used LED drive circuit. Since the principle of the step-down constant current switching power supply circuit is that the output voltage is lower than the input voltage, when the input voltage is lower than the output voltage, the IC does not work, a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H05B45/375
CPCH05B45/375
Inventor 张凤
Owner XIAMEN YANKON ENERGETIC LIGHTING CO LTD