Flyback switching power supply, control method thereof and ultrasonic equipment
A switching power supply and flyback technology, which is applied in control/regulation systems, ultrasonic/sonic/infrasonic diagnosis, electrical components, etc., can solve the problem of weak load capacity of flyback switching power supply, large voltage stress of switch tube, and stable circuit Poor performance and other problems, to achieve the effect of improving safety and stability, increasing energy, and improving loading capacity
Inactive Publication Date: 2021-06-15
VINNO TECH (SUZHOU) CO LTD
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- Claims
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Problems solved by technology
Based on the existing structure of the flyback switching power supply, when the output voltage is high, the voltage stress of the switching tube in the flyback switching power supply is relatively large, and the circuit stability is poor; when the output voltage is low, the Weak carrying capacity
Method used
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Embodiment
[0018] This embodiment provides a flyback switching power supply, such as figure 1 As shown, it includes: an input circuit 1 for providing an input voltage VIN; an output circuit 2 for supplying power to an external load RL; a transformer T1 including a primary winding coupled to the input circuit 1 and a secondary coupled to the output circuit Winding; control circuit 3, coupled with transformer T1, capable of controlling input circuit 1 to supply energy to output circuit 2 via transformer T1; and regulating circuit 4, coupled with output circuit 2 and transformer T1 respectively, and capable of outputting voltage based on output circuit 2 VOUT adjusts the turns ratio of the primary and secondary windings of transformer T1.
[0019] Optionally, the primary winding is N1, the secondary winding includes a first secondary winding N2 and a second secondary winding N3 connected in sequence, and the regulating circuit 4 can control the first secondary winding N2 as an output circui...
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The invention provides a flyback switching power supply, a control method thereof, and ultrasonic equipment. The flyback switching power supply comprises: an input circuit used for providing an input voltage; an output circuit used for supplying power to an external load; a transformer including a primary winding coupled with the input circuit and a secondary winding coupled with the output circuit; a control circuit which is coupled with the transformer and can control the input circuit to supply energy to the output circuit through the transformer; and an adjusting circuit which is coupled with the output circuit and the transformer, can adjust the turn ratio of the primary winding to the secondary winding of the transformer based on the output voltage of the output circuit, and can automatically reduce the turn ratio when the output voltage is relatively high, so as to reduce the drain voltage of the first switching tube, reduce the voltage stress of the first switching tube, prevent the first switching tube is prevented from being damaged, and improve the stability of the flyback switching power supply. When the output voltage is low, the turn ratio is automatically increased, and the energy transmitted to the output circuit is increased, so that the loading capacity of the output circuit is improved.
Description
technical field [0001] The invention relates to the technical field of power supplies, in particular to a flyback switching power supply, a control method thereof, and an ultrasonic device. Background technique [0002] In medical color ultrasound equipment, the probe chip is usually driven by a flyback switching power supply, because the driving voltage and transmission power of the probe chip change with the change of the transmission mode and the chip: conventional B mode, voltage in PW mode Up to 45V-150V, but in CW mode, the voltage is relatively small, generally below 12V, and the current can reach 1500mA. In order to meet the various operating modes of the probe element, the flyback switching power supply needs to provide a wide range of output voltages. Based on the existing structure of the flyback switching power supply, when the output voltage is high, the voltage stress of the switching tube in the flyback switching power supply is relatively large, and the circ...
Claims
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IPC IPC(8): H02M3/335H02M1/08H02M1/32H02H7/10A61B8/00
CPCH02M3/33507H02M1/08H02M1/32H02H7/10A61B8/00
Inventor 周泉彭利军赖敏福
Owner VINNO TECH (SUZHOU) CO LTD