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US 12,665,521 B2Granted
Converter and control method of sending PWM driver gating signal thereof
AssigneeHuawei Digital Power Technologies Co., Ltd.
InventorsZhu Mao, Yaowei Hu, Jun Zhao
Life of this patent
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Abstract
A converter and a control method of sending a pulse width modulation (PWM) driver gating signal thereof. When an alternating current voltage output by the converter is in an O area, the converter may be controlled to switch between an upper half-bridge arm straight-through mode and a lower half-bridge arm straight-through mode. In this way, it can be ensured that there is a freewheeling path for a current in an inductive component, and a problem that a switching transistor of a secondary-side circuit is in a straight-through state is avoided.
Claims20
A converter, comprising:
- a transformer,
- an inductive component,
- a primary-side circuit, wherein the primary-side circuit is connected to a primary-side winding of the transformer;
- a secondary-side circuit, wherein the secondary-side circuit is connected in series to the inductive component and then connected to a secondary-side winding of the transformer, the secondary-side circuit comprises a half-bridge circuit that comprises;
- a bridge arm, wherein the bridge arm comprises an upper half-bridge arm and a lower half-bridge arm, the upper half-bridge arm or the lower half-bridge arm comprises two switching transistors with opposite freewheeling directions, and a connection point of the upper half-bridge arm and the lower half-bridge arm is connected to a first end of the secondary-side winding of the transformer by using the inductive component,
- a first capacitor, and
- a second capacitor, wherein;
- the first capacitor and the second capacitor are connected in series and then connected in parallel to the bridge arm;
- a connection point of the first capacitor and the second capacitor is connected to a second end of the secondary-side winding of the transformer, the secondary-side circuit further comprises a third capacitor that is connected in parallel to the bridge arm;
- and
- a controller configured to:
- after an alternating current voltage output by the converter is greater than or equal to a specified negative voltage threshold and is less than or equal to a specified positive voltage threshold, control the converter to switch between an upper half-bridge arm straight-through mode and a lower half-bridge arm straight-through mode, wherein
- in the upper half-bridge arm straight-through mode, the inductive component, the upper half-bridge arm, the third capacitor, the second capacitor, and the secondary-side winding form a current path, and
- in the lower half-bridge arm straight-through mode, the inductive component, the lower half-bridge arm, the third capacitor, the first capacitor, and the secondary-side winding form the current path;
- and
- after a current flowing through the inductive component is greater than or equal to a specified negative current threshold and is less than or equal to a specified positive current threshold, sequentially:
- control all switching transistors in the upper half-bridge arm or the lower half-bridge arm that is in a straight-through state to be turned off, and
- control all switching transistors in the upper half-bridge arm or the lower half-bridge arm that is in a cut-off state to be turned on, to enable the converter to implement mutual switching between the upper half-bridge arm straight-through mode and the lower half-bridge arm straight-through mode;
- and
- after the current flowing through the inductive component is less than the specified negative current threshold or is greater than the specified positive current threshold, sequentially:
- control a subset of the switching transistors that are in the straight-through state in the upper half-bridge arm or the lower half-bridge arm to be turned off,
- control a subset of the switching transistors that are in the cut-off state in the upper half-bridge arm or the lower half-bridge arm to be turned on,
- control all of the switching transistors that are in the straight-through state in the upper half-bridge arm or the lower half-bridge arm to be turned off, and
- control all of the switching transistors that are in the cut-off state in the upper half-bridge arm or the lower half-bridge arm to be turned on, to enable the converter to implement mutual switching between the upper half-bridge arm straight-through mode and the lower half-bridge arm straight-through mode.
21 more elements
A control method for a converter, comprising:
- after an alternating current voltage output by the converter is greater than or equal to a specified negative voltage threshold and is less than or equal to a specified positive voltage threshold,
- controlling the converter to switch between an upper half-bridge arm straight-through mode and a lower half-bridge arm straight-through mode, wherein
- in the upper half-bridge arm straight-through mode, an inductive component, an upper half-bridge arm, a third capacitor, a second capacitor, and a secondary-side winding form a current path, and
- in the lower half-bridge arm straight-through mode, the inductive component, a lower half-bridge arm, the third capacitor, a first capacitor, and the secondary-side winding form the current path;
- and
- after a current flowing through the inductive component is greater than or equal to a specified negative current threshold and is less than or equal to a specified positive current threshold,
- controlling switching transistors that are in a straight-through state in the upper half-bridge arm or the lower half-bridge arm to be turned off, and
- controlling switching transistors that are in a cut-off state in the upper half-bridge arm or the lower half-bridge arm to be turned on, to enable the converter to implement mutual switching between the upper half-bridge arm straight-through mode and the lower half-bridge arm straight-through mode;
- and
- after, the current flowing through the inductive component is less than the specified negative current threshold or is greater than the specified positive current threshold,
- sequentially controlling a subset of the switching transistors that are in the straight-through state in the upper half-bridge arm or the lower half-bridge arm to be turned off;
- controlling a subset of the switching transistors that are in the cut-off state in the upper half-bridge arm or the lower half-bridge arm to be turned on;
- controlling all of the switching transistors that are in the straight-through state in the upper half-bridge arm or the lower half-bridge arm to be turned off;
- and
- controlling all of the switching transistors that are in the cut-off state in the upper half-bridge arm or the lower half-bridge arm to be turned on, to enable the converter to implement mutual switching between the upper half-bridge arm straight-through mode and the lower half-bridge arm straight-through mode.
12 more elements
Dependencies are inferred from the claim text.