Power conversion device and magnetic assembly
A power conversion circuit and a magnetic assembly are provided. The magnetic assembly comprises a transformer magnetic core, an inductance magnetic core, a first winding and a second winding, and discloses a winding method of the first winding and the second winding. On the other hand, an auxiliary power supply circuit is provided. When the output voltage of the power conversion circuit does not reach the steady-state working voltage or the power conversion circuit is in a standby state, power supply is provided for the MCU and the power management bus. On the other hand, the application provides a power switch VDS voltage clamping protection circuit suitable for a power conversion circuit. The application of the small-size compact power conversion device can be realized, the loss of the power conversion device is reduced, and the conversion efficiency is improved.
1 . A power conversion device, comprising a power conversion circuit, a group of control signals and a group of drivers;
wherein the power conversion circuit comprises at least two switch bridge arms, each switch bridge arm comprises an upper switch, a middle switch and a lower switch, and the at least two switch bridge arms comprise a first switch bridge arm and a second switch bridge arm;
wherein the group of control signals comprise a first control signal, a second control signal, a third control signal and a fourth control signal, the first control signal and the second control signal are staggered by 180 degrees, the third control signal is complementary to the second control signal, and the fourth control signal is complementary to the first control signal;
wherein the first control signal is used for controlling on and off of the upper switch of the first switch bridge arm, the second control signal is used for controlling on and off of the upper switch of the second switch bridge arm, the third control signal is used for controlling on and off of the lower switch of the second switch bridge arm, and the fourth control signal is used for controlling on and off of the lower switch of the first switch bridge arm;
wherein an AND operation result signal of the first control signal and the fourth control signal are used for controlling the on and off of the middle switch of the second switch bridge arm, and an AND operation result signal of the second control signal and the third control signal is used for controlling the on and off of the middle switch of the first switch bridge arm.
2 . The power conversion device of claim 1 , wherein a lower switch of each of the switch bridge arms comprises two switches electrically connected in parallel, the third control signal provides drive signals for two lower switches of the second switch bridge arm via two drivers respectively, and the fourth control signal provides drive signals for the two lower switches of the first switch bridge arm respectively via the two drivers.
3 . The power conversion device of claim 1 , wherein a middle switch of each of the switch bridge arms comprises two switches electrically connected in parallel, two switches of the first switch bridge arm are controlled by a control signal via a driver, and two switches of the second switch bridge arm are controlled by another control signal via a driver.
4 . The power conversion device of claim 1 , wherein the turn-on duty cycle of the middle switches is the duty cycle of the power conversion device.
5 . The power conversion device of claim 4 , when the duty cycle is less than or equal to 0.5, the middle switch of the first switch bridge arm is controlled by the second control signal, and the middle switch of the second switch bridge arm is controlled by the first control signal.
6 . The power conversion device of claim 4 , when the duty cycle is greater than 0.5, the middle switch of the first switch bridge arm is controlled by the third control signal, and the middle switch of the second switch bridge arm is controlled by the fourth control signal.
7 . The power conversion device of claim 1 , wherein in the first switch bridge arm, the upper switch and the middle switch are electrically connected in series to a first upper node, and the middle switch and the lower switch are electrically connected in series to a first lower node;
and in the second switch bridge arm, the upper switch and the middle switch are electrically connected in series to a second upper node, and the middle switch and the lower switch are electrically connected in series to a second lower node.
8 . The power conversion device of claim 7 , further comprising two transformer windings; wherein the two transformer windings are coupled; wherein first ends of the two transformer windings are electrically connected to the first lower node and the second lower node respectively, and second ends of the two transformer windings are connected.
9 . The power conversion device of claim 8 , further comprising two flying capacitors, each of the flying capacitors being connected between the upper node of one switch bridge arm and the lower node of the other switch bridge arm.
10 . The power conversion device of claim 9 , further comprising an inductor, wherein one end of the inductor is electrically connected to the second ends of the two transformer windings, and the other end of the inductor is electrically connected to a positive output terminal of the power conversion device.
11 . The power conversion device of claim 1 , wherein the power conversion device converts an input voltage into an output voltage; wherein a voltage gain ratio of the output voltage to the input voltage is D/2; wherein D is a conduction duty cycle of the middle switch.