Combined feedforward and fixed time delay
AssigneeSTMicroelectronics International N.V.
InventorAdalberto Lino Mariani
Life of this patent
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Abstract
According to an embodiment, a delay circuit for a control logic in a converter is provided. The delay circuit includes a first timer circuit having a transconductance amplifier and a first capacitor. The delay circuit includes a second timer circuit coupled to the first timer circuit. The second timer circuit includes a first current generator, a second current generator, and a second capacitor. The second timer circuit is configured to receive an output signal from the first timer circuit to modify a charging current provided by the second current generator or a sum of the first current generator and the second current generator to charge the second capacitor in the second timer circuit.
Claims20
A delay circuit for a control logic in a converter, the delay circuit comprising:
- a first timer circuit comprising a transconductance amplifier and a first capacitor, the first timer circuit having a first transfer characteristic equal to
- α
- V
- in
-
- or
-
- α
- ×
- V
- out
- V
- in
- ,
- where α is a first multiplier factor associated with the transconductance amplifier, Vin is a supply voltage for the converter, and Vout is an output voltage of the converter;
- and
- a second timer circuit coupled to the first timer circuit, the second timer circuit comprising a first current generator, a second current generator, and a second capacitor, the second timer circuit configured to receive an output signal from the first timer circuit to modify a charging current provided by the second current generator or a sum of the first current generator and the second current generator to charge the second capacitor in the second timer circuit, the second timer circuit having a second transfer characteristic equal to
- β
- -
- α
- V
- in
-
- or
-
- β
- -
- α
- ×
- V
- out
- V
- in
- ,
- where β is a second multiplier factor associated with the first current generator.
A method of operating a delay circuit for a control logic in a converter, the method comprising:
- receiving, by the delay circuit, a start command signal from the control logic;
- generating, by a first timer circuit of the delay circuit, a first delay signal, the first timer circuit comprising a transconductance amplifier and a first capacitor, the first timer circuit having a first transfer characteristics equal to
- α
- V
- in
-
- or
-
- α
- ×
- V
- out
- V
- in
- ,
- where α is a first multiplier factor associated with the transconductance amplifier, Vin is a supply voltage for the converter, and Vout is an output voltage of the converter;
- receiving, by a second timer circuit of the delay circuit, the first delay signal and the start command signal from the first timer circuit, the second timer circuit comprising a first current generator, a second current generator, and a second capacitor;
- modifying a charging current provided by the second current generator or a sum of the first current generator and the second current generator for charging the second capacitor in the second timer circuit based on the first delay signal;
- and
- generating, by the second timer circuit, a second delay signal used by the control logic to generate control signals for switching elements of the converter, the second timer circuit having a second transfer characteristic equal to
- β
- -
- α
- V
- in
-
- or
-
- β
- -
- α
- ×
- V
- out
- V
- in
- ,
- where β is a second multiplier factor associated with the first current generator.
A converter, comprising:
- a switching element;
- a control logic configured to control switching operations of the switching element;
- and
- a delay circuit coupled to the control logic, the delay circuit comprising:
- a first timer circuit comprising a transconductance amplifier and a first capacitor, the first timer circuit having a first transfer characteristic equal to
- α
- V
- in
-
- or
-
- α
- ×
- V
- o
-
- u
-
- t
- V
- in
- ,
- where α is a first multiplier factor associated with the transconductance amplifier, Vin is a supply voltage for the converter, and Vout is an output voltage of the converter;
- and
- a second timer circuit coupled to the first timer circuit, the second timer circuit comprising a first current generator, a second current generator, and a second capacitor, the second timer circuit configured to receive an output signal from the first timer circuit to modify a charging current provided by the second current generator or a sum of the first current generator and the second current generator to charge the second capacitor in the second timer circuit, the second timer circuit having a second transfer characteristic equal to
- β
- -
- α
- V
- i
-
- n
-
- or
-
- β
- -
- α
- ×
- V
- o
-
- u
-
- t
- V
- in
- ,
- where β is a second multiplier factor associated with the first current generator.
Dependencies are inferred from the claim text.