Control of a half-bridge

Patent metadata

Field	Value
Publication number	US-2016126946-A1
Application number	US-201414891546-A
Country	US
Kind code	A1
Filing date	Mar 11, 2014
Priority date	May 14, 2013
Publication date	May 5, 2016
Grant date	—

Abstract

A control for an electrical consumer includes a first switching device for connecting an output for the consumer to a first potential, a second switching device for connecting the output to a second potential, a control device for activating the switching devices, a first scanning device for providing a first signal as a function of a switching state of the first switching device, a second scanning device for providing a second signal as a function of a switching state of the second switching device, and a comparator device for determining a difference in the switch-on times of the switching devices on the basis of the determined signals.

First claim

1 .- 10 . (canceled)

11 . A control for an electrical consumer, comprising:
a first switching device for connecting an output for the consumer to a first potential; a second switching device for connecting the output to a second potential; a control device for activating the switching devices; a first scanning device for supplying a first signal as a function of a switching state of the first switching device; a second scanning device for supplying a second signal as a function of a switching state of the second switching device; and a comparator device for determining a difference in switch-on times of the first and second switching devices on the basis of the first and second signals.

12 . The control as recited in claim 11 , wherein:
one of the first and second switching devices includes a field effect transistor, and the one of the first and second scanning devices associated with the one of the first and second switching devices that includes the field effect transistor is configured to determine a closed switching state when a voltage between a gate terminal and a source terminal of the field effect transistor is below a predetermined threshold value.

13 . The control as recited in claim 11 , wherein the comparator device includes an integrating comparator that is configured to supply a voltage on the basis of the first and second signals, a deviation of which from a predetermined potential is a measure for the difference in the switch-on times.

14 . The control as recited in claim 11 , wherein the comparator device includes a digital counter that is configured to increment a uniform clock signal during the first signal and to decrement the clock signal during the second signal, a deviation of the count from a predetermined count being a measure for the difference in the switch-on times.

15 . The control as recited in claim 11 , wherein the control device activates periodically the first and second switching devices within a scope of a pulse width modulation.

16 . The control as recited in claim 15 , wherein the determination includes several periodic activations of the first and second switching devices.

17 . The control as recited in claim 11 , wherein the first and second switching devices are encompassed by a half-bridge.

18 . The control as recited in claim 11 , wherein the first and second switching devices are encompassed by a bridge branch of an H-bridge.

19 . The control as recited in claim 11 , wherein the control device activates the first and second switching devices in such a way that the difference between the switch-on times is minimized.

20 . The control as recited in claim 11 , wherein the control device is configured to minimize a dead time, during which neither the first switching device nor the second switching device is activated.

Assignees

• Bosch Gmbh Robert

Inventors

• Joos Joachim
• Schiemann Werner
• Haug Martin

Classifications

• H02M1/08

  Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters · CPC title

• H03K17/165

  by feedback from the output circuit to the control circuit · CPC title

• H02P7/04

  by means of a H-bridge circuit · CPC title

• H03K17/18

  Modifications for indicating state of switch · CPC title

• H03K17/687 Primary

  the devices being field-effect transistors · CPC title