Forward converter with secondary side adopting LC self-reset circuit and system
A forward converter and forward conversion technology, which is applied in the direction of adjusting electrical variables, control/regulation systems, and output power conversion devices, etc., can solve the problem of low utilization rate of excitation energy, complex circuit composition, and large loss in magnetic reset circuits. problem, to achieve the effect of high work safety and reliability, simple circuit and low power consumption
Active Publication Date: 2021-06-22
XIAN UNIV OF SCI & TECH
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Problems solved by technology
[0007] The technical problem to be solved by the present invention is to provide a forward converter and system in which the secondary side adopts an LC self-resetting circuit to solve the problem of low utilization rate of excitation energy and complex circuit composition of the existing magnetic reset circuit. , high loss and low efficiency
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[0027] Now in conjunction with the accompanying drawings, the preferred embodiments of the present invention will be described in detail.
[0028] Such as figure 1 As shown, the present invention provides a preferred embodiment of a forward converter using an LC self-resetting circuit on the secondary side.
[0029] A forward converter whose secondary side adopts an LC self-resetting circuit includes a forward converter main circuit 110 and an energy transfer and transmission circuit 120, and the forward converter main circuit 110 includes a high-frequency transformer T, a switch tube S, The first diode D1, the second diode D2, the first inductor L1 and the first capacitor C1, the energy transfer and transmission circuit 120 includes the second capacitor C2 and the second inductor L2; wherein, the high frequency transformer The same-named terminal of the primary side of T is the positive voltage input terminal IN+ of the main circuit 110 of the forward converter, the differen...
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The invention relates to the field of switching power supplies, in particular to a forward converter with a secondary side adopting an LC self-reset circuit and a system. The forward converter comprises a forward converter main circuit and an energy transfer and transmission circuit, the forward converter main circuit comprises a high-frequency transformer, a switching tube, a first diode, a second diode, a first inductor and a first capacitor, and the energy transfer and transmission circuit comprises a second capacitor and a second inductor. The forward converter has the advantages that the excitation energy is transferred to a load side, so that the utilization rate of the excitation energy of a transformer is improved, the overall efficiency of the converter is improved, and the working stability and reliability are high; a magnetic reset loop is simple in structure and is convenient to popularize and use; the magnetic reset circuit does not contain an energy-consuming element, so that the loss is small; the increase and decrease of the currents of the two inductors at the output end are opposite, so that the output current ripples of the converter can be reduced.
Description
technical field [0001] The invention relates to the field of switching power supplies, in particular to a forward converter and a system in which a secondary side adopts an LC self-resetting circuit. Background technique [0002] The forward converter has many advantages such as simple structure, electrical isolation of input and output, high reliability, large output power, smooth output voltage and output power not limited by transformer capacity, so in the application occasion of low and medium power supply, positive Transducers are widely used. [0003] When the switch is turned on, the energy at the input terminal is transmitted to the load through the transformer. At this time, the transformer core works in the first quadrant of the hysteresis loop under the action of forward current. However, when the switch is turned off, the excitation energy is not released. loop, the forward converter itself cannot complete the magnetic reset. If the magnetic core cannot return t...
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IPC IPC(8): H02M3/335H02M1/14
CPCH02M3/33507H02M3/33523H02M1/14Y02B70/10
Inventor 刘树林沈一君王自恒庹汉宇王成张元昌
Owner XIAN UNIV OF SCI & TECH