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US 2018/0123467 A1Published application
Switched-mode converter and method for converting electrical energy
AssigneeFinelc Oy
InventorJukka VILHUNEN
Life of this patent
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Abstract
There are large amounts of switched-mode power supplies used for supplying energy for electrical devices. This brings the need to improve the efficiency of the power conversion. The present switched mode converter of electrical power has a secondary winding in a secondary circuit, which at a first phase both accumulates and releases energy to load, or only accumulates energy. At a second phase the secondary winding is connected to input voltage and/or releases the accumulated energy in the secondary circuit in order to increase power release of the primary winding to the load. The solution increases both the output energy and efficiency of the converter.
Claims19
Switched mode converter for converting electrical power, comprising in its coupling:
- a ferromagnetic core (F),
- a primary winding (L1) on the ferromagnetic core (F),
- a secondary winding (L2) on the ferromagnetic core (F),
- a first controllable primary switch (T1) coupled controllably with primary control pulses (G1) to connect the primary winding (L1) to input power (P) when the controllable primary switch (T1) is set into ON state, to energize the primary winding (L1) to increase its current (I1) to create a magnetic flux in the core (F) so that the increase of the magnetic flux also increases the secondary current (I2) in the secondary winding (L2),
- a second primary switch (D1) coupled to connect the primary winding (L1) to a load,
- wherein said secondary winding (L2) is coupled controllably (G2) to get energized by secondary pulses of input power (P) via a switch (T2) being controlled, directly after the primary pulse (G1), when the primary winding (L1) being releasing the magnetic energy,
- wherein to have the switched mode converter operated with improved efficiency,
- said secondary winding (L2) is located at some distance from the primary winding (L1) so with the structure facilitating an unequal magnetic flux to develop in the ferromagnetic core (F);
- and/or
- at least one of said primary (L1) and secondary windings (L2) have such a shape or diameter, that the magnetic flux of the ferromagnetic core (F) is unequal being smaller on the location of the secondary winding (L2) because of the opposite current direction of the secondary winding (L2) which reduces the growth of the magnetic flux.
7 more elements
Switched mode converter for converting electrical power, comprising:
- a ferromagnetic core,
- a primary winding on the ferromagnetic core,
- a first controllable primary switch connecting the primary winding to input power when the switch is in ON state,
- a second primary switch connecting the primary winding to load,
- wherein the first controllable primary switch (T1) is controlled with primary control pulses (G1) to energize the primary winding (L1) by increasing its current (I1) during a primary pulse (G1) to create a magnetic flux in the core, and
- wherein between primary pulses (G1) the primary winding (L1) releases energy of the magnetic flux to the load whereby the current (I1) of the primary winding (L1) decreases (I1),
- wherein in order to improve the efficiency of the converter, the converter further comprises a secondary circuit with a secondary winding (L2) on the ferromagnetic core (F), and the secondary circuit is arranged to transfer energy of the secondary winding (L2) and/or another energy source to the primary winding (L1) during said decrease of current (I1) of the primary winding (L1), wherein the transfer of energy of the secondary circuit is arranged by
- a circuitry connected so that in the second phase the secondary winding winding (L2) is in the state of being not energized by pulses of input power, and the secondary circuit in said circuitry includes such a self-inductance Ls (L2) which generates a voltage proportional to the secondary current change (Us=Ls×dIs/dt) in the direction of the current, which then impacts in the similar way as secondary pulses of separate input power wherein the secondary winding (L2) is continuously connected with a switch (D2) to the load, and accordingly also during the decrease phase of the primary (I1) and secondary currents (I2) these currents release energy to the load (LOAD, R, C), the coupling being implemented optionally without the secondary switch (T2), or optionally
- a controllable secondary switch (T2), coupled to have ON state and OFF state, coupled controllable with secondary control pulses (G2) having states corresponding said ON and OFF states of said primary secondary switch (T2), coupled to connect the secondary winding (L2) to input power (P) when the switch (T2) is set into ON state, to energize the secondary winding (L2) to the load.
6 more elements
A method for converting electrical power, wherein:
- a first primary switch (T1) is controlled (G1) to connect a pulse of input voltage (U) to a primary winding of a ferromagnetic core (F) at a first phase,
- thereafter, released energy from the primary winding (L1) is led to a load through second primary switch (D1) at a second phase, whereby the current (I1) of the primary winding (L1) is decreased,
- which method is wherein in order to improve the efficiency of the conversion, energy of the secondary winding (L2) and/or another energy source is transferred to the primary winding (L1) during said decrease of current (I1) of the primary winding (L1).
Dependencies are inferred from the claim text.