Digital interface for driving at least a couple of power elements, in particular in PWM applications
First Claim
1. A digital interface for driving at least one complementary pair of first and second power elements connected in an inverter configuration between first and second voltage references, the digital interface comprising:
- a first input terminal for receiving a PWM input signal;
a first counter stage connected to the first input terminal;
a second counter stage connected to an output of the first counter stage;
a toggle stage connected to the first input terminal and to an output of the second counter stage;
a first output terminal connected to an output of the toggle stage, and to be connected to a control terminal of the first power element; and
a second output terminal connected to the output of the first counter stage for receiving a delayed PWM output signal therefrom, and to be connected to a control terminal of the second power element;
the toggle stage generating a second PWM output signal for the first output terminal, the second PWM output signal being kept at a desired low level in correspondence with switching of the PWM input signal having a lower duration than a predetermined duration.
1 Assignment
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Accused Products
Abstract
A digital interface for driving at least one complementary pair of first and second power elements connected in an inverter configuration between first and second voltage references is provided. The digital interface includes a first input terminal for receiving a PWM input signal, a first counter stage connected to the first input terminal, and a second counter stage connected to an output of the first counter stage. A toggle stage is connected to the first input terminal and to an output of the second counter stage. A first output terminal is connected to an output of the toggle stage, and is to be connected to a control terminal of the first power element. A second output terminal is connected to the output of the first counter stage for receiving a delayed PWM output signal therefrom, and is to be connected to a control terminal of the second power element. The toggle stage generates a second PWM output signal for the first output terminal. The second PWM output signal is kept at a desired low level in correspondence with switching of the PWM input signal having a lower duration than a predetermined duration.
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Citations
24 Claims
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1. A digital interface for driving at least one complementary pair of first and second power elements connected in an inverter configuration between first and second voltage references, the digital interface comprising:
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a first input terminal for receiving a PWM input signal; a first counter stage connected to the first input terminal; a second counter stage connected to an output of the first counter stage; a toggle stage connected to the first input terminal and to an output of the second counter stage; a first output terminal connected to an output of the toggle stage, and to be connected to a control terminal of the first power element; and a second output terminal connected to the output of the first counter stage for receiving a delayed PWM output signal therefrom, and to be connected to a control terminal of the second power element; the toggle stage generating a second PWM output signal for the first output terminal, the second PWM output signal being kept at a desired low level in correspondence with switching of the PWM input signal having a lower duration than a predetermined duration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A control system for an electrical motor comprising:
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a driving stage to be connected to the electrical motor and comprising a complementary pair of first and second power elements connected in an inverter configuration between first and second voltage references; and a digital interface connected to the driving stage and comprising a first input terminal for receiving a PWM input signal, a first counter stage having an input connected to the first input terminal and an output providing a delayed PWM output signal to a control terminal of the second power element, a second counter stage having an input connected to the output of the first counter stage, and a toggle stage having inputs connected to the first input terminal and to an output of the second counter stage, and an output connected to a control terminal of the first power element for providing a second PWM output signal, the second PWM output signal being kept at a desired low level in correspondence with switching of the PWM input signal having a lower duration than a predetermined duration. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for interfacing with a driving stage connected to an electrical motor, the driving stage comprising a complementary pair of first and second power elements connected in an inverter configuration between first and second voltage references, the method comprising:
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connecting a first counter stage to a first input terminal receiving a PWM input signal; connecting a second counter stage to an output of the first counter stage; connecting a toggle stage to the first input terminal and to an output of the second counter stage; connecting an output of the toggle stage to a control terminal of the first power element; and connecting the output of the first counter stage to a control terminal of the second power element for providing a delayed PWM output signal thereto; and the toggle stage generating a second PWM output signal, the second PWM output signal being kept at a desired low level in correspondence with switching of the PWM input signal having a lower duration than a predetermined duration. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification