Switch power supply
A switching power supply and switching device technology, applied in the direction of electric light source, light source, electric lamp circuit layout, etc., can solve the problems of affecting the illuminance of high-brightness LED lamps, changing the current greatly, failing to achieve energy saving, etc., to achieve reliable protection and prolong life. , reduce the effect of light decay
Inactive Publication Date: 2012-12-26
深圳市万禧环保节能科技有限公司
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Problems solved by technology
In the past, the driving method of single or several series of high-brightness LEDs with low power is to control the current of high-brightness LEDs by connecting fixed current-limiting resistors in series. The disadvantage of this method is that when the input voltage changes, the current The current of the high-brightness LED lamp changes greatly, which affects the illuminance of the high-brightness LED lamp, and the current limiting resistor connected in series has a large power consumption and low efficiency
Later, in order to achieve accurate constant current control, a linear constant current circuit appeared to drive high-brightness LED lights. drop for constant current control, the linear adjustment tube has a voltage drop and current, resulting in a large power consumption
This will cause a very large loss in the application of large-scale high-brightness LED street lights or high-brightness LED square lights, failing to achieve the purpose of energy saving
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[0018] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.
[0019] The main idea of the present invention is to use a stable and reliable switching power supply PWM control chip that has been used in the power supply industry for many years, and realize constant voltage and constant voltage by expanding some driving circuits to control switching devices, voltage feedback circuits, current amplification circuits, and constant current loops. Stream output function. According to the power of the existing high-brightness LED lamps, such as the module composed of 1W, 3W, 5W high-brightness LED lamps, according to the configuration of the module, design the corresponding by adjusting the resistance value of the sampling resistor RS1 and the amplification ratio of the current amplifier. The current value is controlled by constant current to realize the constant c...
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The invention discloses a switch power supply, comprising an input module, a switching device, a filtering output circuit and a high-brightness LED (Light-Emitting Diode) lamp which are connected in sequence, wherein the high-brightness LED lamp, a voltage feedback circuit, a PWM (Pulse-Width Modulation) control chip and a driving circuit are connected in sequence; the high-brightness LED lamp, a current amplifying circuit, a constant-current circuit, the PWM control chip and the driving circuit are connected in sequence; the input module is connected with an auxiliary power supply circuit; an output end of the auxiliary power supply circuit is respectively connected with the PWM control chip, the driving circuit, the constant-current circuit and the current amplifying circuit; and the PWM control chip and the driving circuit are connected with the switching device. With the adoption of the technical scheme disclosed by the invention, not only accurate constant-current driving of the high-brightness LED lamp be realized, but also the energy transmission can be finished by the switching device and an energy storing device.
Description
technical field [0001] The invention relates to the technical field of LED lamp lighting, in particular to a switching power supply. Background technique [0002] Light-emitting diodes (LEDs) were invented in the 1960s. LEDs have the advantages of small size, long life, low power consumption, fast response, and good shock resistance. They are widely used in signal indication, digital display and other fields. With the continuous improvement of LED luminescent material technology, the development of high-brightness LEDs has been successful, especially the successful development of white-light high-brightness LEDs, making it widely used in indoor and outdoor decoration, and even urban street lighting and civil lighting. However, the driving of high-brightness LEDs is a problem that needs to be solved. Manufacturers of high-brightness LEDs recommend constant current driving. In the past, the driving method of single or several series of high-brightness LEDs with low power is t...
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Inventor 范传伟
Owner 深圳市万禧环保节能科技有限公司