Double-winding secondary side feedback switching power supply
A technology of feedback switch and switching power supply, which is applied in the direction of electrical components, adjusting electric variables, emergency protection circuit devices, etc., can solve problems such as difficulty in meeting the sixth-level energy efficiency standard, large power supply loss, and load burnout, and achieve simple voltage sampling circuit , Dissipated power is small, the effect of precise overvoltage protection control
Pending Publication Date: 2019-05-03
SHAANXI REACTOR MICROELECTRONICS
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Problems solved by technology
However, this technology has the following problems in practical application: 1. When the feedback loop is disconnected, such as when the light-emitting diode in the optocoupler is broken down and short-circuited, the switching power supply control chip on the primary side cannot monitor and control the output voltage V out , when the output voltage is too high, the load will be burned, and even more serious safety accidents will occur
2. Due to the consideration of R 1 On loss issues, R 1 Usually choose MΩ class resistance, Q 1 giving to C 2 When the power supply is in the amplification area, there is no saturation conduction, so the voltage drop generated is very high, even as high as hundreds of volts, resulting in a large loss of power supply, and it is difficult to meet the sixth-level energy efficiency standard
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[0043] Below will combine the appended in the embodiment of the present invention figure 1 to attach Figure 5 , clearly and completely describe the technical solutions in the embodiments of the present invention, obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0044] The switching tubes involved in the technical solutions provided by the embodiments of the present invention can be transistors such as MOS, MESFET, JFET, etc., and can be enhancement type or depletion type. In the embodiments of the present invention, MOS tubes are used as an example to illustrate; The connection can be a direct connection of components or an electrical connection.
[0045] Various embodiments of the present disclosure will...
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The invention discloses a double-winding secondary side feedback switching power supply. The switching power supply includes a primary side rectification and filtering unit, a control unit, a self-power supply unit, a secondary side feedback unit, an OVP unit, a double-winding transformer, and a voltage signal acquisition unit. The switching power supply can obtain voltage stabilization output through secondary side feedback, monitors output voltage by using overvoltage protection, and controls the output voltage within a safe range; and standby power consumption can be effectively reduced bybootstrap power supply.
Description
technical field [0001] The disclosure belongs to the technical field of electronic circuits, and in particular relates to a dual-winding secondary-side feedback switching power supply. Background technique [0002] Switching power supply is a power supply conversion device for electronic equipment and electronic appliances. As people pay more and more attention to the safety of switching power supply, the application of isolated switching power supply is becoming more and more extensive. [0003] In traditional isolated switching power supplies, optocoupler isolation feedback is often used to obtain stable voltage output, such as figure 1 shown. The system will output the output voltage V through the optocoupler set by the feedback loop out The signal is fed back to the PWM module in the switching power supply control chip, and then the PWM module adjusts the energy transmitted from the transformer to the secondary side by controlling the duty cycle, thereby realizing the ...
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IPC IPC(8): H02M7/217H02M3/335H02M1/36H02M1/32H02H7/12
CPCY02B70/10
Inventor 杨世红熊平
Owner SHAANXI REACTOR MICROELECTRONICS