Mode automatic converting circuit for DC-DC (Direct Current to Direct Current) converter
A DC-DC, automatic conversion technology, applied in the direction of output power conversion devices, instruments, electrical components, etc., can solve the problems of reduced converter efficiency, not load, change, etc., to simplify peripheral application circuits and increase accuracy.
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Embodiment 1
[0046] refer to Figure 4 , the average current sampling circuit 4 of the present invention includes a bias circuit 41, a current sampling circuit 42, a filter 43 and a fast charging branch 44;
[0047] The bias circuit 41 includes two NMOS transistors and one PMOS transistor, that is, the first NMOS transistor M1, the second NMOS transistor M2 and the fifth PMOS transistor M5, wherein:
[0048] The gate of the first NMOS transistor M1 is connected to the gate of the second NMOS transistor M2 to form a current mirror structure, which is used as the second output terminal B of the bias circuit 41 to output the bias voltage signal V B1 , to provide a reference current for the current sampling circuit 42; the source of the first NMOS transistor M1 is connected to the source of the second NMOS transistor M2, and connected to ground; the drain of the first NMOS transistor M1 is used as the input terminal of the bias circuit 41 L, and the reference current source I of the chip wher...
Embodiment 2
[0069] refer to Figure 5 , the average current sampling circuit 4 of the present invention includes: a bias circuit 41, a current sampling circuit 42, a filter 43 and a fast charging branch 44, wherein the circuit structure and implementation of the current sampling circuit 42, the filter 43 and the fast charging branch 44 Example 1 is the same.
[0070] The fourth input terminal C of the current sampling circuit 42 and the reference voltage V of the chip where it is located BIAS Connect to each other, and the other end connections are all the same as in Embodiment 1;
[0071] refer to Figure 6 , the bias circuit 41 is provided with an input terminal and an output terminal, its input terminal L and the reference voltage V of the chip where it is located BIAS The output terminal A thereof is connected to the fast charging branch 44 to provide a bias voltage signal for the fast charging branch 44 . The bias circuit 41 includes a second NMOS transistor M2 and a fifth PMOS t...
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