Power device constant driving control circuit and method based on input line voltage compensation
A technology for driving control circuits and power devices, which is applied in the direction of converting DC power input to DC power output, output power conversion devices, electrical components, etc., to achieve the effect of improving safety
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Embodiment 1
[0051] Such as Figure 5 As shown, the compensation voltage and compensation current can be fed back to the generated gate drive signal of the power transistor Q1, for example, the compensation signal is set to be equal to the voltage drop V_ on the second resistor CS When the compensation voltage is equal, you can first use the embedding control module to set the first clamping voltage, and compare the real-time voltage value of the power tube grid with the real-time voltage value of the second connection end of the second resistor after subtracting the first clamping voltage According to the comparison result, the corresponding power tube gate drive signal is generated, and then the compensation voltage is subtracted as the final power tube gate drive signal to adjust the power tube grid voltage. The first clamping voltage can control the power tube grid. The difference between the real-time voltage value and the real-time voltage value at the second connection end of the se...
Embodiment 2
[0053] Such as Figure 6 As shown, the compensation signal can also be fed back to the embedded pressure control module to control the generation of the gate drive signal of the power transistor Q1. While the DRV drive voltage embedded voltage control circuit (2) controls the embedded voltage at both ends of DRV and CS, It also compensates the VGS drive voltage, so that the drive voltage VGS from the gate of the power tube to the element is constant. This is one of the derivative schemes of the drive circuit in this embodiment, and it is one of the specific implementation methods of the present invention. Different implementation methods may be specific circuits. There are also different ways, Figure 6 Not refined, but also possible embodiments of the claimed invention.
Embodiment 3
[0055] It can also be before the voltage clamping control of both ends of DRV and CS in the DRV driving voltage clamping control circuit (2), for example, before or after sampling the CS voltage by the CS voltage sampling circuit (3), so that the sampled CS pin The voltage already contains the voltage drop V_ across the second resistor CS Then, the compensated CS pin voltage and DRV terminal voltage are clamped by the DRV drive voltage embedding control circuit (2), and the VGS drive voltage of the power tube is constant.
[0056] The above-mentioned embodiment 1 to embodiment 3 give the compensation signal to realize the voltage drop V_ on the second resistor CS Several ways to compensate the voltage across DRV and CS, the compensation signal can be the voltage drop V_ on the second resistor CS equal compensation voltage, or it can be the voltage drop V_ on the second resistor CS Related compensation currents, different types of compensation signals and different feedback m...
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