Backlight drive circuit with dual boost circuits

A backlight drive circuit with dual boost circuits, comprising:

• a power supply module, a first electrical inductor, a second electrical inductor, a first rectifier diode, a second rectifier diode, an LED (Light Emitting Diode) light string, a constant current driving chip, an electrical capacitor, a first MOS (Metal Oxide Semiconductor) transistor, a second MOS transistor, a first voltage comparator, and a constant voltage power source, the first electrical inductor having an end electrically connected to the power supply module and an opposite end electrically connected to the first rectifier diode, the second electrical inductor having an end electrically connected to the power supply module and an opposite end electrically connected to an end of the second rectifier diode, the first rectifier diode being electrically connected to an end of the electrical capacitor and an end of the LED light string, the second rectifier diode being electrically connected to an end of the first rectifier diode, the end of the LED light string, and the end of the electrical capacitor, the LED light string being further electrically connected to the constant current driving chip, the electrical capacitor being further electrically connected to the first MOS transistor, the second MOS transistor, and the power supply module, the first MOS transistor being further electrically connected to the first voltage comparator, the constant current driving chip, the opposite end of the first electrical inductor, and the end of the first rectifier diode, the second MOS transistor being further electrically connected to the first voltage comparator, the opposite end of the second electrical inductor, and the end of the second rectifier diode, the first voltage comparator being further electrically connected to the constant voltage power source, the first and second MOS transistors being both electrically connected to the power supply module;
• wherein the electrical capacitor is an electrolyte capacitor;
• further comprising:
• a first and a second resistors, the first resistor having an end electrically connected to the LED light string and the constant current driving chip and an opposite end electrically connected to a grounding line, the second resistor having an end electrically connected to the constant current driving chip and an opposite end electrically connected to the grounding line;
• wherein the first MOS transistor comprises a first gate terminal, a first drain terminal, and a first source terminal, the first gate terminal being electrically connected to the first voltage comparator and the constant current driving chip, the first drain terminal being electrically connected to the opposite end of the first electrical inductor and the end of the first rectifier diode, the first source terminal being electrically connected to the power supply module;
• wherein the second MOS transistor comprises a second gate terminal, a second drain terminal, and a second source terminal, the second gate terminal being electrically connected to the first voltage comparator, the second drain terminal being electrically connected to the opposite end of the second electrical inductor and the end of the second rectifier diode, the second source terminal being electrically connected to the power supply module;
• wherein the first voltage comparator comprises a first output pin, a first positive input pin, and a first negative input pin, the first output pin being electrically connected to the second gate terminal of the second MOS transistor, the first positive input pin being electrically connected to the constant voltage power source, the first negative input pin being electrically connected to the gate terminal of the first MOS transistor and the constant current driving chip;
• wherein the constant current driving chip comprises first to third pins, the first pin being electrically connected to the first negative input pin of the first voltage comparator and the first gate terminal of the first MOS transistor, the second pin being electrically connected to the LED light string and the end of the first resistor, the third pin being electrically connected to the second resistor;
• wherein the constant current driving chip comprises:
• an oscillator and a second voltage comparator, the second voltage comparator comprises a second output pin, a second positive input pin, and a second negative input pin, the second output pin being electrically connected to the first pin of the constant current driving chip, the second negative input pin being electrically connected to the second pin of the constant current driving chip, the second positive input pin being electrically connected to the oscillator, the oscillator being further electrically connected to the third pin of the constant current driving chip;
• and
• wherein the constant voltage power source outputs a voltage that is smaller than or equal to a threshold voltage of the first MOS transistor, the first voltage comparator outputting a voltage that is greater than or equal to a threshold voltage of the second MOS transistor.