Resonant circuit and energy imbalance optimization method thereof

Abstract

The present invention provides a resonant circuit and an energy imbalance optimization method. The resonant circuit has a dual output, and the two output voltages are controlled by controlling the lower transistor and the upper transistor respectively. The secondary circuit provides a first output voltage Vo1 from the first winding end of the first winding through a first unidirectional conduction device. The number of turns of the winding between the first winding end and the secondary reference ground is N1. The secondary circuit provides a second output voltage Vo2 from the second winding end of the second winding through a second unidirectional conduction device. The number of turns of the winding between the second winding end and the secondary reference ground is N2. The secondary circuit further includes a third unidirectional conduction device. The input end of the third unidirectional conduction device is coupled to the third winding end of the first winding, and the output end of the third unidirectional conduction device is coupled to the second output end. The number of turns of the winding between the third winding end and the secondary reference ground is N3, satisfying Vo1*N3 / N1 < Vo2; and / or the secondary circuit further includes a fourth unidirectional conduction device. The input end of the fourth unidirectional conduction device is coupled to the fourth winding end of the second winding, and the output end of the fourth unidirectional conduction device is coupled to the first output end. The number of turns of the winding between the fourth winding end and the secondary reference ground is N4, satisfying Vo2*N4 / N2 < Vo1. The resonant circuit and the energy imbalance optimization method proposed by the present invention can achieve energy imbalance compensation and optimization for the dual-output resonant circuit under any output voltage relationship, and realize simultaneous deep optimization of the two output voltages during transient conditions.

Claims

1. A resonant circuit includes a primary circuit and a secondary circuit. The primary circuit includes an upper transistor, a lower transistor, and a resonant network coupled to the connection point of the upper and lower transistors. The resonant network includes a series-connected resonant inductor, a resonant capacitor, and an exciting inductor. The connection point of the upper and lower transistors is coupled to the same-named terminal of the exciting inductor. The secondary circuit includes a first winding, a first unidirectional conduction device, a second winding, and a second unidirectional conduction device. The different-named terminal of the first winding and the same-named terminal of the second winding are coupled and form a secondary reference ground at the connection point. The first winding has a first winding terminal. The number of winding turns between the first winding terminal and the secondary reference ground is N1. The first winding terminal is coupled to the first output terminal of the resonant circuit through the first unidirectional conduction device. The resonant circuit controls the lower transistor based on the voltage of the first output terminal to stabilize the voltage of the first output terminal at the first output voltage value Vo1. The second winding has a second winding terminal. The number of winding turns between the second winding terminal and the secondary reference ground is N2. The second winding terminal is coupled to the second output terminal of the resonant circuit through the second unidirectional conduction device. The resonant circuit controls the upper transistor based on the voltage of the second output terminal to stabilize the voltage of the second output terminal at the second output voltage value Vo2. Wherein: The secondary circuit further includes a third unidirectional conduction device. The first winding has a third winding terminal. The number of winding turns between the third winding terminal and the secondary reference ground is N3. The input terminal of the third unidirectional conduction device is coupled to the third winding terminal, and the output terminal of the third unidirectional conduction device is coupled to the second output terminal, where Vo1*N3 / N1 < Vo2; and / or The secondary circuit further includes a fourth unidirectional conduction device. The second winding has a fourth winding terminal. The number of winding turns between the fourth winding terminal and the secondary reference ground is N4. The input terminal of the fourth unidirectional conduction device is coupled to the fourth winding terminal, and the output terminal of the fourth unidirectional conduction device is coupled to the first output terminal, where Vo2*N4 / N2 < Vo1.

2. The resonant circuit according to claim 1. When the system is in a steady state, the voltage of the third winding terminal is less than the voltage of the second output terminal, and the third unidirectional conduction device is not conducting. When the voltage of the second output terminal drops, the voltage of the third winding terminal is greater than the voltage of the second output terminal, and the third unidirectional conduction device conducts; and / or when the system is in a steady state, the voltage of the fourth winding terminal is less than the voltage of the first output terminal, and the fourth unidirectional conduction device is not conducting. When the voltage of the first output terminal drops, the voltage of the fourth winding terminal is greater than the voltage of the first output terminal, and the fourth unidirectional conduction device conducts.

3. The resonant circuit according to claim 1, wherein the first winding terminal is the same-named terminal of the first winding, and the third winding terminal is the intermediate terminal of the first winding; or the second winding terminal is the different-named terminal of the second winding, and the fourth winding terminal is the intermediate terminal of the second winding.

4. The resonant circuit according to claim 1, wherein the third winding terminal is the same-named terminal of the first winding, and the first winding terminal is the intermediate terminal of the first winding; or the fourth winding terminal is the different-named terminal of the second winding, and the second winding terminal is the intermediate terminal of the second winding.

5. The resonant circuit according to claim 1, wherein N3 = N1, the first unidirectional conduction device includes a first diode, the anode of the first diode is coupled to the same-named end of the first winding, and the cathode of the first diode is coupled to the first output terminal; the third unidirectional conduction device includes a third diode, the anode of the third diode is coupled to the same-named end of the first winding or the cathode of the first diode, and the cathode of the third diode is coupled to the second output terminal.

6. The resonant circuit according to claim 1, wherein N4 = N2, the second unidirectional conduction device includes a second diode, the anode of the second diode is coupled to the opposite-named end of the second winding, and the cathode of the second diode is coupled to the second output terminal; the fourth unidirectional conduction device includes a fourth diode, the anode of the fourth diode is coupled to the opposite-named end of the second winding or the cathode of the second diode, and the cathode of the fourth diode is coupled to the first output terminal.

7. A resonant circuit, comprising a primary circuit and a secondary circuit, wherein the primary circuit includes an upper transistor, a lower transistor, and a resonant network coupled to the connection point of the upper transistor and the lower transistor. The resonant network includes a series-connected resonant inductor, a resonant capacitor, and an exciting inductor. The connection point of the upper transistor and the lower transistor is coupled to the same-named end of the exciting inductor. The secondary circuit includes a first winding, a first unidirectional conduction device, a second winding, and a second unidirectional conduction device. The opposite-named end of the first winding and the same-named end of the second winding are coupled and the connection point forms the secondary reference ground of the secondary circuit. The same-named end of the first winding is coupled to the input terminal of the first unidirectional conduction device, and the output terminal of the first unidirectional conduction device is coupled to the first output terminal of the resonant circuit. The resonant circuit controls the lower transistor based on the voltage at the first output terminal to stabilize the voltage at the first output terminal at a first output voltage value; the opposite-named end of the second winding is coupled to the input terminal of the second unidirectional conduction device, and the output terminal of the second unidirectional conduction device is coupled to the second output terminal of the resonant circuit. The resonant circuit controls the upper transistor based on the voltage at the second output terminal to stabilize the voltage at the second output terminal at a second output voltage value; wherein: The secondary circuit further includes a third unidirectional conduction device, wherein the input terminal of the third unidirectional conduction device is coupled to the output terminal of the first unidirectional conduction device, and the output terminal of the third unidirectional conduction device is coupled to the second output terminal; and / or The secondary circuit further includes a fourth unidirectional conduction device, wherein the input terminal of the fourth unidirectional conduction device is coupled to the output terminal of the second unidirectional conduction device, and the output terminal of the fourth unidirectional conduction device is coupled to the first output terminal.

8. A method for optimizing energy imbalance in a resonant circuit, wherein the resonant circuit includes a primary circuit and a secondary circuit, wherein the primary circuit includes an upper transistor, a lower transistor, and a resonant network coupled to the coupling point of the upper and lower transistors, wherein the resonant network includes a resonant inductor, a resonant capacitor, and a magnetizing inductor connected in series, the coupling point of the upper and lower transistors is coupled to the same-name terminal of the magnetizing inductor, the secondary circuit includes a first winding, a first unidirectional conducting device, a second winding, and a second unidirectional conducting device, wherein the opposite-name terminal of the first winding and the same-name terminal of the second winding are coupled and the coupling point forms the secondary reference ground of the secondary circuit, the first winding has a first winding terminal, the number of winding turns between the first winding terminal and the secondary reference ground is N1, the first winding terminal is coupled to the first output terminal of the resonant circuit through the first unidirectional conducting device, and the resonant circuit controls the lower transistor based on the voltage of the first output terminal to stabilize the voltage of the first output terminal at a first output voltage value Vo1; The second winding has a second winding end. The number of winding turns between the second winding end and the secondary reference ground is N2. The second winding end is coupled to the second output terminal of the resonant circuit through the second unidirectional conduction device. The resonant circuit controls the upper transistor based on the voltage at the second output terminal to stabilize the voltage at the second output terminal at a second output voltage value Vo2; The energy imbalance optimization method includes: Coupling the third unidirectional conduction device between the third winding end of the first winding and the second output terminal, wherein the number of winding turns between the third winding end and the secondary reference ground is N3, and controlling the position of the third winding end to satisfy: Vo1 * N3 / N1 < Vo2; and / or The fourth unidirectional conducting device is coupled between the fourth winding terminal of the second winding and the first output terminal, wherein the number of winding turns between the fourth winding terminal and the secondary reference ground is N4, and the position of the fourth winding terminal is controlled to satisfy: Vo2*N4 / N2 <Vo1。 9. The method of claim 7, further comprising, when Vo1 is less than Vo2, taking N3=N1, such that the first winding end and the third winding end are both the same name ends of the first winding.

10. The method of claim 7, further comprising, when Vo2 is less than Vo1, taking N4=N2, such that the second winding end and the fourth winding end are both opposite ends of the second winding.

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