Systems, methods, and apparatus to drive reactive loads

摘要

Systems, methods, and apparatus to drive reactive loads are disclosed. An example apparatus to drive a reactive load includes a reactive component in circuit with the reactive load, a first switching element in circuit with the reactive load to selectively hold the reactive load in a first energy state and to selectively allow the reactive load to change from the first energy state to a second energy state, a second switching element in circuit with the reactive load to selectively hold the reactive load in the second energy state and to selectively allow the reactive load to change from the second energy state to the first energy state, and a controller to detect a current in the reactive load, and to control the first and second switching elements to hold the reactive load in the first or the second energy state when the current traverses a threshold.

主权项

1. An apparatus to drive a reactive acoustic source, comprising:
a reactive component in circuit with the reactive acoustic source; a first switching element in circuit with the acoustic source to selectively hold the reactive acoustic source in a first energy state and to selectively allow the reactive acoustic source to change from the first energy state to a second energy state; a second switching element in circuit with the reactive acoustic source to selectively hold the reactive acoustic source in the second energy state and to selectively allow the reactive acoustic source to change from the second energy state to the first energy state; and a controller to detect a current in the reactive acoustic source, wherein the driver circuit is configured to:
hold the reactive acoustic source in the first energy state for a first period by maintaining the first switching element and the second switching element in an open position,transition the reactive acoustic source from the first energy state to the second energy state by switching the first switching element to a closed position and then switching the first switching element to the open position in response to the detected current in the reactive acoustic source being substantially zero,hold the reactive acoustic source in the second energy state for a second period by maintaining the first switching element and the second switching element in the open position, andtransition the reactive acoustic source from the second energy state to the first energy state by switching the second switching element to a closed position and then switching the second switching element to the open position in response to the detected current in the reactive acoustic source being substantially zero, wherein the first energy state comprises a first DC voltage having a first polarity and the second energy state comprises a second DC voltage having a second polarity opposite to the first polarity, and wherein the reactive acoustic source generates an acoustic wave during transitions between the first and second energy states.