Linear constant current control circuit suitable for full voltage input
A constant current control circuit and linear constant current technology, applied in the field of power electronics, can solve the problems of incompatibility, inability to light up normally, and high system power, and achieve the effects of reducing repetitive development, simple structure, and improving interchangeability.
Inactive Publication Date: 2019-02-26
SHANGHAI COOLED ELECTRONICS CO LTD
View PDF7 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, the AC direct drive segmented linear constant current adopts a fixed LED connection method, which can be designed and work reliably under a single voltage, and cannot be compatible with 120V 220V 277V input voltage.
For the single-voltage segmented linear constant-current drive circuit, the LED connection method is fixed, and each segment has a tap connected to the switcher constant-current control circuit. This connection method can only meet the single-voltage application.
If the system is designed for 120 volts, and the input voltage is connected to 277 volts, it will cause the system power to be too high or cause overheating due to low efficiency
If the system is designed for 277 volts, when the input voltage is connected to 120v, some LEDs will not light up normally due to insufficient voltage
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0015] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0016] Such as Figure 1-Figure 5 A linear constant current control circuit adapted to full voltage input is shown, including full wave rectification circuit, LED string, switch, amplitude attenuation and peak detection circuit, A / D conversion circuit, microprocessor, reference voltage generator . A segmented constant current control circuit, the LED string includes a high voltage section and a low voltage section, and the microprocessor controls the switching switch according to the level of the input voltage so that the high vo...
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
Login to View More Abstract
The present invention relates to a linear constant current control circuit suitable for full voltage input. The linear constant current control circuit comprises a full-wave rectification circuit, a LED string, a switching switch, an amplitude attenuation and peak detection circuit, an A / D conversion circuit, a microprocessor, a reference voltage generator and a sectional-type constant current control circuit. The LED string comprises a high-section voltage portion and a low-section voltage portion, the microprocessor controls the switching switch according to the voltage to allow the high-section voltage portion and the low-section voltage portion of the LED string to perform connection in parallel and connection in series, and each LED sub section of the LED string is connected with thesectional-type constant current control circuit through a center tap to perform separated constant current control. The linear constant current control circuit suitable for full voltage input is simple in circuit structure and high in reliability.
Description
technical field [0001] The invention belongs to the technical field of power electronics, in particular to a linear constant current control circuit adapted to full voltage input. Background technique [0002] Lamps that use LEDs as solid-state lighting sources require less power to achieve the same illuminance and have a longer service life than traditional lamps, thereby achieving the goals of energy saving and low maintenance costs, and are gradually being widely used in the field of industrial lighting. [0003] Industrial lighting fixtures are widely used as working lighting and emergency lighting in industries such as petroleum, chemical industry, steel, metallurgy, mining, fire protection and gas, railway, electric power, public security, army, flood control, diving salvage and rescue and disaster relief. The voltage fluctuation range of the site is very large. In some countries, such as the United States, there are two input voltages of 120V and 277V, which require d...
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
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/37Y02B20/30
Inventor 王钦恒
Owner SHANGHAI COOLED ELECTRONICS CO LTD