A feedback circuit and system for feeding back secondary side voltage to primary side
A feedback circuit and secondary voltage technology, applied in electrical components, output power conversion devices, etc., can solve the problem that the optocoupler creepage distance cannot meet the safety requirements.
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Embodiment 1
[0058] see image 3 , which is a schematic structural diagram of a feedback circuit that feeds back the secondary side voltage to the primary side provided by the embodiment of the present application.
[0059] The feedback circuit for feeding back the secondary side voltage to the primary side provided in the embodiment of the present application includes: a voltage sampling circuit 201, an analog-to-digital conversion circuit 202, a digital isolator 203, and a digital-to-analog conversion circuit 204;
[0060] The voltage sampling circuit 201 is configured to sample the output voltage of the secondary side, and output the sampled voltage to the analog-to-digital conversion circuit 202;
[0061] Specifically, the voltage sampling circuit 201 can be realized by using a voltage divider circuit, or by using a voltage sensor, or by using a voltage transformer, which is not specifically limited in this embodiment.
[0062] The analog-to-digital conversion circuit 202 is configure...
Embodiment 2
[0071] The working principle of the feedback circuit is described below with a specific circuit diagram.
[0072] see Figure 4 , which is a circuit diagram of a feedback circuit that feeds back the secondary side voltage to the primary side provided by the embodiment of the present application.
[0073] As a specific implementation manner, in this embodiment, the voltage sampling circuit is introduced as a voltage dividing circuit.
[0074] Such as Figure 4 As shown, the voltage sampling circuit includes: a first resistor R1 and a second resistor R2; the output voltage Vout of the secondary side is grounded through the first resistor R1 and the second resistor R2 connected in series in sequence.
[0075] R1 and R2 divide the voltage of Vout, wherein the voltage on R2 is used as the sampling voltage V1.
[0076] As a specific implementation manner, the analog-to-digital conversion circuit in this embodiment may be an integrated analog-to-digital converter ADC. As another ...
Embodiment approach
[0100] As a specific implementation manner, the primary side control circuit includes: a reference voltage source U43, an eighth resistor R8, a second capacitor C2 and a third capacitor C3;
[0101] Such as Figure 4 As shown, the second end of the second switching tube Q2 is connected to the first end of the reference voltage source U43 through the sixth resistor R6 and the seventh resistor R7 connected in series in sequence;
[0102] The second terminal of the reference voltage source U43 is grounded; the third terminal of the reference voltage source U43 is used as the feedback terminal FB of the sampling voltage V1, and the primary side controller adjusts the output of the secondary side according to the voltage of the feedback terminal FB Voltage Vout.
[0103] The eighth resistor R8 and the third capacitor C3 are connected in series to the first end and the third end of the reference voltage source U43; the second capacitor C2 is connected in parallel to the first end a...
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