Passive type current balance driving device
A current balancing and driving device technology, which is applied in the direction of lighting devices, lamp circuit layout, electric light source, etc., can solve the problems of different, wasteful adjustment channels, cost waste, etc.
Active Publication Date: 2014-02-05
SPI ELECTRONICS
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Problems solved by technology
[0006] However, semiconductor components such as MOSFETs often have different characteristic curves (Id / Vgs) of drain current (Id) and gate-source voltage (Vgs) due to process differences.
Therefore, the accuracy of adjusting the current flowing through each LED string by using the current mirror circuit formed by the MOSFET or the current feedback compensation circuit is limited.
[0007] In addition, the number of adjustment channels of off-the-shelf current adjustment chips is usually fixed (usually 4 or 6 adjustment channels), and since one adjustment channel is used to adjust the current flowing through a group of LED strings, when the LED When the backlight module has, for example, 10 groups of light-emitting diode strings, it is necessary to select 3 current regulation chips with 4 regulation channels, or 2 current regulation chips with 6 regulation channels, but no matter which one is selected 2 unused adjustment channels will be wasted, which will undoubtedly cause unnecessary cost waste
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[0041] Reference will now be made in detail to embodiments of the invention, examples of which are illustrated in the accompanying drawings. In addition, wherever possible, elements / components using the same reference numerals in the drawings and embodiments represent the same or similar parts.
[0042] figure 1 It is a schematic circuit diagram of the passive current balance driving device 100 according to the first embodiment of the present invention. Please refer to figure 1, The passive current balance driving device 100 includes a transformer (transformer) T1, a capacitor (capacitor) C1, and a first diode (diode) D1 to a fourth diode (diode) D4. In the first embodiment, the transformer T1 has a primary side (primary side) P1 and a secondary side (secondary side) S1, and the primary side P1 of the transformer T1 is used to receive the AC power V AC .
[0043] A first end of the capacitor C1 is coupled to a first end of the secondary side S1 of the transformer T1. A ca...
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The invention provides a passive type current balance driving device. In the device of the invention, circuittopology only comprises several simple passive components and multi-group of light emitting diodes (LEDs) can be simultaneously driven. In the passive type current balance driving device of the invention, load characteristics of each LED which is strung in positive and negative half cycles of alternating current power supply are designed same. Therefore, currents, which flow through every LED, are basically / virtually the same so as to reach a purpose of current balance.
Description
technical field [0001] The invention relates to a current balance technology, and in particular to a passive current balance driving device. Background technique [0002] In recent years, with the vigorous development of semiconductor technology, portable electronic products and flat panel display products are also emerging. Among the types of flat panel displays, Liquid Crystal Display (LCD for short) has become the mainstream of various display products due to its advantages of low voltage operation, no radiation scattering, light weight and small size. Generally speaking, since the liquid crystal display panel itself does not have the characteristic of self-illumination, a backlight module must be placed under the liquid crystal display panel to provide the light source required by the liquid crystal display panel. [0003] Traditional backlight modules can be roughly divided into two categories, one is a backlight module composed of cold cathode tubes (Cold Cathode Fluo...
Claims
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IPC IPC(8): H05B37/02
Inventor 邓智仁谢文森
Owner SPI ELECTRONICS