Multipath-output switch power supply circuit
A switching power supply circuit and multi-output technology, which is applied in the direction of output power conversion device, DC power supply parallel operation, AC power input conversion to DC power output, etc., can solve the problem of complex circuit structure, limited improvement of cross regulation rate, Problems such as poor cross-regulation rate, achieve simple circuit structure, improve cross-regulation rate performance, reliability and feasibility
Inactive Publication Date: 2012-05-30
MORNSUN GUANGZHOU SCI & TECH
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Problems solved by technology
[0002] The traditional multi-output circuit only takes a certain output voltage sampling signal and feeds it back to the controller, and stabilizes the output voltage by adjusting the duty cycle. When the load of the main circuit and the auxiliary circuit changes, other output voltages will have a large deviation. poor cross adjustment
In order to improve the cross-regulation performance, solutions such as weighted feedback and magnetic amplifier are often used. Among them, the weighted feedback scheme has simple circuit and low cost, but the improvement of cross-regulation rate is relatively limited; the cross-regulation rate performance of the scheme with magnetic amplifier is relatively low. Good, but there are defects of complex circuit structure and high cost
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[0019] The basic idea of the present invention is that the secondary side of the transformer has at least two outputs, both of which have energy storage inductors; continuous mode.
[0020] Without loss of generality, the present invention will be further described below by taking a dual-output circuit as an example with reference to the drawings and embodiments.
[0021] See figure 1 , this figure is a schematic circuit diagram of the present invention. In the figure, the transformer 3 is a forward transformer, and its input is controlled by the controller 1; the transformer 3 has two output circuits, both of which include energy storage inductors, and are respectively connected to the input terminals of the controller 1 through a feedback circuit, Wherein: the energy storage inductor L1 in the main circuit works in a continuous mode; the energy storage inductor L2 in the auxiliary circuit works in a discontinuous mode.
[0022] like figure 1 As shown, in the main circu...
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The invention discloses a multipath-output switch power supply circuit which comprises a transformer with a plurality of output circuits and a controller which controls the transformer input. The transformer is a forward transformer. Each output circuit comprises an energy storage inductor. At least two output circuits are respectively connected with an input end of the controller by a feedback circuit, wherein, the energy storage inductors in partial output circuits work under a continuous mode, and the energy storage inductors in the other output circuits work under a discontinuous mode. The multipath-output switch power supply circuit has simple structure and can improve the cross regulation performance.
Description
technical field [0001] The invention relates to a system for adjusting electric or magnetic variables, in particular to a switching power supply circuit with multiple outputs. Background technique [0002] The traditional multi-output circuit only takes a certain output voltage sampling signal and feeds it back to the controller, and stabilizes the output voltage by adjusting the duty cycle. When the load of the main circuit and the auxiliary circuit changes, other output voltages will have a large deviation. The cross adjustment rate is poor. In order to improve the cross-regulation performance, solutions such as weighted feedback and magnetic amplifier are often used. Among them, the weighted feedback scheme has simple circuit and low cost, but the improvement of cross-regulation rate is relatively limited; the cross-regulation rate performance of the scheme with magnetic amplifier is relatively low. Good, but there are defects of complex circuit structure and high cost. ...
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IPC IPC(8): H02M7/217H02J1/10
Inventor 尹向阳
Owner MORNSUN GUANGZHOU SCI & TECH