Buck-boost control circuit of LED (Light Emitting Diode) lamp
A technology of LED lamps and control circuits, which is applied to the layout of electric lamp circuits, electric light sources, lighting devices, etc., and can solve the problems affecting the reliability of power supply devices and the convenience of installation. Problems such as working characteristics, to achieve the effect of simple overall circuit structure, good constant current characteristics, and high reliability
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[0020] Example: such as figure 1 As shown, the present invention is a buck-boost control circuit for LED lamps, the switch tube Q1 is a MOSFET, and the pulse width modulation circuit U1 is a pulse width modulation chip that does not need a secondary side control circuit and a loop compensation circuit; the gate of the switch tube Q1 The pole G is connected to the output (OUT) terminal of the pulse width modulation circuit U1, the source S is connected to the power ground through the current sampling resistor R4, the drain D is connected to the DC power supply V+ through the inductance coil L1A, and the anode of the output diode D1 is connected to the inductance coil L1A Terminal 1 and cathode are connected to the anode of LED 2, the cathode of LED 2 is connected to terminal 2 of the inductance coil L1A, the filter capacitor C1 is connected to both ends of the LED 2 in parallel, the auxiliary coil L1B and the inductance coil L1A are coupled through the magnetic core, and the aux...
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