Device and method for inductive current sampling of bridge-free PFC circuit
A technology of inductor current and sampling device, which is applied in the field of electricity, can solve the problems of reduced reliability of power supply and small duty cycle of PFC circuit, etc., and achieve the effects of reducing difficulty and complexity, flexible control, and comprehensive sampling
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[0039] In Example 1, the first sampling unit is the first sampling resistor Rs1, the second sampling unit is the second sampling resistor Rs2, and the third sampling unit is the third sampling resistor Rs3.
[0040] Figure 4 It is a schematic diagram of the structure of Example 1 of the embodiment of the present invention, such as Figure 4 As shown, the first end of the first inductor L1 of the bridgeless PFC circuit is connected to the first end of the AC power supply of the bridgeless PFC circuit, and the second end of the first inductor L1 is connected to the first boost diode D1 of the bridgeless PFC circuit. The anode of is connected and connected to the first end of the first switch S1 of the bridgeless PFC circuit; the second end of the first switch S1 is connected to the first end of the first sampling resistor Rs1, and the bridgeless PFC circuit inductance is sent The first sampling signal V1 of the current; the second terminal of the first sampling resistor Rs1 is conn...
Example Embodiment
[0043] Example 2: The first sampling unit is a first current mutual inductance device, the second sampling unit is a second current mutual inductance device, and the third sampling unit is a third current mutual inductance device;
[0044] Figure 5 Is a schematic diagram of Example 2 of the embodiment of the present invention, such as Figure 5 As shown, the first current transformer device includes: a first current transformer CT1, a fifth resistor R5, a fifth diode D5, and a fourth sampling resistor Rs4. The first end of the secondary side of the first current transformer CT1 and the second The first end of the five resistor R5 is connected, the anode of the fifth diode D5 is connected to the first end of the fifth resistor R5, the cathode of the fifth diode D5 is connected to the first end of the fourth sampling resistor Rs4, and The first sampling signal V1 of the inductance current of the bridgeless PFC circuit is sent, and the second end of the fifth resistor R5 is connecte...
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