Backlight driving circuit and electronic device
A backlight drive circuit and buffer circuit technology, applied in the electronic field, can solve problems such as interference chip, switch node voltage burr, and antenna performance affecting electronic equipment, etc., and achieve the effect of reducing frequency oscillation, radiation and electromagnetic interference
Inactive Publication Date: 2016-12-21
SHENZHEN TINNO WIRELESS TECH
View PDF5 Cites 5 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
When the switch is closed, that is, when the MOS transistor T1 is turned on, a closed loop will be formed between the capacitor Cj1, the capacitor Cj2, the inductor Lj1, the inductor Lj2, and the output capacitor Cout, resulting in a voltage spike at the switch node (ie, the other end of the inductor L1), namely The voltage on the switch node oscillates at a certain frequency, thereby generating radiation and electromagnetic interference to the chip of the electronic device, and even affecting the performance of the antenna of the electronic device
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
[0017] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0018] The invention discloses an electronic device, which specifically can be a smart phone, a television, a tablet computer or other electronic devices with a display. Wherein, the electronic equipment includes a backlight driving circuit.
[0019] Such as figure 2 as shown, figure 2 is a structural schematic diagram of the backlight driving circuit of the present invention. The backlight drive circuit includes a power input terminal Vin, a first inductor L1, a diode D, a first capacitor Cj1, a second capacitor Cout, an LED lamp array 12, a second inductor Lj2, a third inductor Lj1, a first switch T1, a third Capacitor Cj2, snubber circuit 11 and fifth capacitor Cin.
[0020] The power input terminal Vin is used to connect the input voltage.
[0021] One end of the first inductor L1 is connected to the power input terminal Vin, and the other ...
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 invention discloses a backlight driving circuit. The backlight driving circuit includes a power source input end, a first inductor, a diode, a first capacitor, a second capacitor, an LED lamp array, a third inductor and a third capacitor; one end of the first inductor is connected with the power source input end; one end of the diode is connected with the other end of the first inductor; the first capacitor is connected in parallel with two ends of the diode; one end of the second capacitor is connected with the other end of the diode, and the other end of the second capacitor is grounded through a second inductor; the LED lamp array is connected in parallel with two ends of the second capacitor; one end of the third inductor is connected with the other end of the first inductor, and the other end of the third inductor is grounded through a first switch; the third capacitor is connected in parallel with two ends of the first switch; and one end of the third inductor is grounded through a buffer circuit, so that the voltage glitch of the one end of the third inductor can be absorbed through the buffer circuit. The invention also discloses an electronic device. With the above technical schemes of the invention adopted, the voltage glitch on a switch node can be absorbed, so that the frequency oscillation of the backlight driving circuit can be effectively reduced.
Description
technical field [0001] The invention relates to the technical field of electronic technology, in particular to a backlight driving circuit and electronic equipment. Background technique [0002] The backlight driving circuit used in current electronic equipment is a boost circuit, and the current backlight driving circuit is prone to switching noise, causing the voltage on the switching node to oscillate at a certain frequency, thereby generating radiation and electromagnetic interference to the performance of the antenna of the electronic equipment. Such as figure 1 As shown, the capacitor Cj1 and the capacitor Cj2 are the parasitic capacitance of the diode and the MOS transistor T1 respectively, the inductance Lj1 is the parasitic inductance of the internal wiring of the electronic device chip, and the inductance Lj2 is the parasitic inductance of the wiring from the output capacitance Cout of the boost circuit to the ground. When the switch is closed, that is, when the M...
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): G09G3/34
CPCG09G3/3406
Inventor 李新
Owner SHENZHEN TINNO WIRELESS TECH