System and method for efficient drive of capacitive actuators with voltage amplification

摘要

A circuit for driving a plurality of capacitive actuators, the circuit having a low-voltage side, a high voltage side and a flyback transformer between the two. The low-voltage side comprises first and second pairs of low-side switches connected in series across an input voltage. The flyback transformer has a primary winding connected to the two pairs of switches. The high-voltage side has a pair of switches connected between the secondary winding of the flyback transformer and a ground and a plurality of capacitive loads and bidirectional switches to connect the loads to the secondary winding of the flyback transformer and a ground.

主权项

1. A circuit for driving a plurality of capacitive actuators, comprising:
a low-voltage side comprising:
first and second pairs of low-side switches, said first pair of comprising switches Q1 and Q3 connected in series across said input voltage and said second pair comprising switches Q2 and Q4 connected in series across said input voltage;low-side control logic connected to said low-side switches Q1, Q2, Q3 and Q4 for controlling said low-side switches Q1, Q2, Q3 and Q4; anda flyback transformer having a primary winding connected on a first end between said switches Q1 and Q3 and connected on a second end between said switches Q2 and Q4; a high-voltage side comprising:
a switch Q5 connected between a first end of a secondary winding of said flyback transformer and a ground;a capacitive load CA0;a bidirectional switch QA0 connected in series with said capacitive load CA0, wherein when said bidirectional switch QA0 is closed said capacitive load CA0 is connected between said first end of said secondary winding of said flyback transformer and a ground;a switch Q6 connected between a second end of a secondary winding of said flyback transformer and a ground;a capacitive load CB0; anda bidirectional switch QB0 connected in series with said capacitive load CB0, wherein when said bidirectional switch QB0 is closed said capacitive load CB0 is connected between said second end of said secondary winding of said flyback transformer and a ground;high-side control logic connected to said switches Q5, Q6, QA0 and QB0 for controlling said switches Q5, Q6, QA0 and QB0.