Isolated phase shifted DC to DC converter with frequency synthesizer to reconstruct primary clock
First Claim
1. An isolated DC to DC converter, comprising:
- a transformer, including a primary winding, and a secondary winding;
a first bridge circuit, including first bridge circuit input to receive an input signal, a first bridge circuit output coupled with the primary winding, and a plurality of primary switches individually coupled between the first bridge circuit input and the first bridge circuit output, the primary switches operative according to primary side switching control signals to provide a primary voltage signal to the first bridge circuit output;
a second bridge circuit, including a second bridge circuit input coupled to receive a secondary voltage signal from the secondary winding, a second bridge circuit output, and a plurality of secondary switches individually coupled between the second bridge circuit input and the second bridge circuit output, the secondary switches operative according to secondary side switching control signals to provide an output voltage signal at the second bridge circuit output;
a primary side control circuit configured to provide the primary side switching control signals according to a primary side clock signal; and
a secondary side control circuit configured to provide the secondary side switching control signals to regulate the output voltage signal by controlling a phase shift angle between switching transitions of the secondary side switching control signals and switching transitions of a secondary side clock signal, the secondary side control circuit including;
an interrupt circuit configured to selectively discontinue the secondary side switching control signals, anda frequency synthesizer circuit configured to synchronize the secondary side clock signal to transitions in the secondary voltage signal while the secondary side switching control signals are discontinued.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed examples include isolated phase shifted dual active bridge DC to DC converters with a first bridge circuit operative according to a primary side clock signal to provide a primary voltage signal to a transformer primary winding, a second bridge circuit operative according to a secondary side clock signal to convert a secondary voltage signal from a transformer secondary winding to provide an output voltage signal, and a secondary side control circuit that alternately operates in a first mode to regulate the output voltage signal by controlling a phase shift angle between switching transitions of secondary side switching control signals and switching transitions of the secondary side clock signal, and a second mode to discontinue the secondary side switching control signals and synchronize the secondary side clock signal to transitions in the secondary voltage signal while the secondary side switching control signals are discontinued.
48 Citations
20 Claims
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1. An isolated DC to DC converter, comprising:
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a transformer, including a primary winding, and a secondary winding; a first bridge circuit, including first bridge circuit input to receive an input signal, a first bridge circuit output coupled with the primary winding, and a plurality of primary switches individually coupled between the first bridge circuit input and the first bridge circuit output, the primary switches operative according to primary side switching control signals to provide a primary voltage signal to the first bridge circuit output; a second bridge circuit, including a second bridge circuit input coupled to receive a secondary voltage signal from the secondary winding, a second bridge circuit output, and a plurality of secondary switches individually coupled between the second bridge circuit input and the second bridge circuit output, the secondary switches operative according to secondary side switching control signals to provide an output voltage signal at the second bridge circuit output; a primary side control circuit configured to provide the primary side switching control signals according to a primary side clock signal; and a secondary side control circuit configured to provide the secondary side switching control signals to regulate the output voltage signal by controlling a phase shift angle between switching transitions of the secondary side switching control signals and switching transitions of a secondary side clock signal, the secondary side control circuit including; an interrupt circuit configured to selectively discontinue the secondary side switching control signals, and a frequency synthesizer circuit configured to synchronize the secondary side clock signal to transitions in the secondary voltage signal while the secondary side switching control signals are discontinued. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A phase shifted dual active bridge DC to DC converter, comprising:
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a first bridge circuit configured to convert an input signal to provide a primary voltage signal to a primary winding of a transformer according to a primary side switching control signal; a primary side control circuit configured to provide the primary side switching control signal according to a primary side clock signal; a second bridge circuit configured to convert a secondary voltage signal from a secondary winding of the transformer to provide an output voltage signal according to a secondary side switching control signal; a secondary side control circuit operative in a first mode to provide the secondary side switching control signal to regulate the output voltage signal by controlling a phase shift angle between switching transitions of the secondary side switching control signal and switching transitions of a secondary side clock signal, the secondary side control circuit operative in a second mode to discontinue the secondary side switching control signal, and to synchronize the secondary side clock signal to transitions in the secondary voltage signal while the secondary side switching control signal is discontinued. - View Dependent Claims (15, 16, 17)
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18. A method for operating a phase shifted dual active bridge DC to DC converter, the method comprising:
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operating secondary switches of a dual active bridge DC to DC converter to convert a transformer secondary voltage signal to regulate a converter output voltage signal by controlling a phase shift angle between switching transitions of secondary side switching control signals and switching transitions of a secondary side clock signal; discontinuing the secondary side switching control signals after an integer number N cycles of the secondary side clock signal, N being greater than 1; synchronizing the secondary side clock signal to transitions in the transformer secondary voltage signal while the secondary side switching control signals are discontinued; and resuming the secondary side switching control signals after synchronizing the secondary side clock signal to the transitions in the transformer secondary voltage signal. - View Dependent Claims (19, 20)
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Specification