US 11,456,667 B2Granted

Constant ripple injection circuit for switching converter

AssigneeTexas Instruments Incorporated

InventorsLiang Zhang, Weibing Jing, Dan Li, Qi Yang

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Abstract

A system includes an input voltage node configured to provide an input voltage. The system also includes a load and a switching converter coupled between the input voltage node and the load. The switching converter is configured to provide an output voltage to the load based on the input voltage. The switching converter includes gate driver circuitry and a comparator coupled to the gate driver circuitry. The switching converter also includes a constant ripple injection circuit coupled to the comparator. The constant ripple injection circuit is configured to provide a positive current sense signal and a negative current sense signal to the comparator based on the input voltage and the output voltage.

Claims22

Dependent claims

A system, comprising:

a first switch having a first current terminal, a second current terminal, and a first control terminal;
a second switch having a third current terminal, a fourth current terminal, and a second control terminal, the third current terminal coupled to the second current terminal;
an inductor having a first inductor terminal and a second inductor terminal, the first inductor terminal coupled to the second current terminal;
a control circuit having a first terminal, a second terminal, a third terminal, and a fourth terminal, the first terminal coupled to the first control terminal, the second terminal coupled to the second control terminal, the third terminal coupled to the first current terminal, and the fourth terminal coupled to the second inductor terminal, the control circuit comprising:
a switch driver circuit coupled to the first terminal and to the second terminal;
a comparator having a comparator input and a comparator output, the comparator output coupled to the switch driver circuit;
and
a ripple injection circuit coupled to the comparator input, the third terminal, and the fourth terminal, the ripple injection circuit comprising:
a first circuit configured to produce a first current based on a voltage at the third terminal;
a second circuit configured to produce a second current based on a voltage at the fourth terminal;
and
a third circuit configured to produce a ripple injection voltage at the comparator input based on the first current and the second current.

9 more elements

A switching converter, comprising:

a switch driver circuit;
a comparator having a comparator input and a comparator output, the comparator output coupled to the switch driver circuit;
and
a ripple injection circuit coupled to the comparator input, the ripple injection circuit comprising:
a first circuit configured to produce a first current proportional to an input voltage;
a second circuit configured to produce a second current proportional to an output voltage;
and
a third circuit coupled to the first circuit, the second circuit, and the comparator input, the third circuit configured to provide a ripple injection voltage to the comparator input based on the first current and the second current.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/008,253Filed 31 Aug 2020 · continuation
Priority: WO PCT/CN2020/0827861 Apr 2020
Published: US 2021/0313885 A17 Oct 2021
Granted: 27 Sep 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

H02M 3/158
With automatic control of output voltage or current, e.g. switching regulators: including plural semiconductor devices as final control devices…
H02M 1/0009
Details of control, feedback or regulation circuits: devices or circuits for detecting current in a converter
H02M 1/08
Details of apparatus for conversion: circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in…
H02M
Apparatus for conversion between ac and ac, between ac and dc, or