Search

CN-224218291-U - AC-AC chopper electronic transformer

CN224218291UCN 224218291 UCN224218291 UCN 224218291UCN-224218291-U

Abstract

The utility model discloses an AC-AC chopping electronic transformer, which comprises a bus power supply unit, a chopping unit, a protection output unit, a current sampling unit, a voltage sampling unit, a control unit and a frequency zero-crossing sampling unit, wherein the bus power supply unit is connected with the chopping unit; the bus power supply unit is connected with the chopping unit, the chopping unit is connected with the protection output unit, the current sampling unit and the voltage sampling unit are respectively connected with the control unit, the bus power supply unit is connected with the frequency zero crossing point sampling unit, and the frequency zero crossing point sampling unit is connected with the control unit. The transformer can improve control precision, realize dynamic real-time monitoring and strengthen overload protection capability.

Inventors

  • SHEN XUEMEI

Assignees

  • 深圳市华菱电源有限公司

Dates

Publication Date
20260508
Application Date
20250527

Claims (10)

  1. 1. The AC-AC chopper electronic transformer is characterized by comprising a bus power supply unit, a chopper unit, a protection output unit, a current sampling unit, a voltage sampling unit, a control unit and a frequency zero crossing sampling unit, wherein the bus power supply unit is connected with the chopper unit, the chopper unit is connected with the protection output unit, the current sampling unit and the voltage sampling unit are respectively connected with the control unit, the bus power supply unit is connected with the frequency zero crossing sampling unit, and the frequency zero crossing sampling unit is connected with the control unit.
  2. 2. The AC-AC chopper electronic transformer according to claim 1, wherein the bus power supply unit comprises an inductor L3, an inductor L4, a current limiting resistor RS3, an electrolytic capacitor EC5, a diode D2, a diode D8, a diode D1 and a stabilizing capacitor C1, wherein the inductor L4 is connected with the inductor L3 through the current limiting resistor RS3, the electrolytic capacitor EC5 is connected with the inductor L4 in parallel, the diode D2 is connected with the current limiting resistor RS3, the diode D8 is connected with the inductor L3, the diode D1 is connected with the inductor L3, and one end of the stabilizing capacitor C1 is connected between the diode D1 and the inductor L3.
  3. 3. An AC-AC chopped electronic transformer according to claim 2 in which the chopping unit comprises a thyristor Q1, the thyristor Q1 being connected to the diode D1.
  4. 4. An AC-AC chopped electronic transformer according to claim 3 in which said protection output unit comprises a relay K1, said relay K1 being connected to said diode D1.
  5. 5. The AC-AC chopper electronic transformer according to claim 4, wherein the voltage sampling unit comprises a sampling resistor RS2, a sampling resistor R36 and a filter capacitor C13, wherein the sampling resistor RS2 is connected with the thyristor Q1, the sampling resistor R36 is connected with the thyristor Q1 and the control unit respectively, and the filter capacitor C13 is connected in parallel with the sampling resistor R36.
  6. 6. The AC-AC chopper electronic transformer of claim 5, wherein the current sampling unit comprises a divider resistor R4, a diode D3, a divider resistor R12 and a filter capacitor C4, wherein the divider resistor R4 is connected with the diode D1, the divider resistor R4 is connected with the diode D3, the diode D3 is connected with the filter capacitor C4, the diode D3 is connected with the control unit, and the divider resistor R12 is connected in parallel with the filter capacitor C4.
  7. 7. The AC-AC chopper electronic transformer according to claim 6, wherein the frequency zero-crossing sampling unit comprises a voltage dividing resistor R3, a voltage dividing resistor R5 and a filter capacitor C5, wherein the voltage dividing resistor R3 is connected with the diode D1, the voltage dividing resistor R5 is connected with the voltage dividing resistor R3, and the voltage dividing resistor R3 is connected with the filter capacitor C5 with one end grounded.
  8. 8. An AC-AC chopped electronic transformer according to claim 1, characterized in that said control unit comprises a control chip U1.
  9. 9. The AC-AC chopped electronic transformer of claim 1, further comprising a temperature feedback unit, said temperature feedback unit being connected to said control unit.
  10. 10. An AC-AC chopper electronic transformer according to claim 9, wherein said temperature feedback unit comprises a thermistor PTC1, a resistor R11 and a resistor R10, said resistor R11 being connected to said control unit, said resistor R10 being connected to said resistor R11, one end of said thermistor PTC1 being connected to said control unit, the other end of said thermistor PTC1 being connected between said resistor R10 and said resistor R11.

Description

AC-AC chopper electronic transformer Technical Field The utility model relates to the technical field of transformers, in particular to an AC-AC chopper electronic transformer. Background Existing AC/AC converters typically rely on pure hardware circuits or a floating drive scheme to implement voltage regulation and control functions. These methods mainly accomplish voltage conversion by fixed parameter electronic components, lacking flexibility and accuracy. Because the control logic is based on a preset hardware configuration, the output voltage is difficult to adjust in real time according to the change of the power grid condition, so that the stability of the output voltage is difficult to maintain under different load conditions. In addition, such designs typically do not support real-time monitoring of key parameters such as input voltage, current, etc., such that the system cannot respond in time to abnormal conditions, such as overloads or short circuits, thereby increasing the risk of back-end equipment damage. In contrast, the development of modern power electronics technology underscores the importance of digital control. However, the conventional AC/AC converter still faces problems of low control accuracy and slow response speed due to the tendency that the conventional AC/AC converter fails to fully utilize. Especially when working under high pressure environment, if overload occurs and no effective protection measures are taken, the damage of internal elements is very easy to cause, and even electrical safety accidents are caused. Therefore, it is necessary to design a new transformer, improve the control accuracy, realize dynamic real-time monitoring and strengthen overload protection capability. Disclosure of utility model The utility model aims to overcome the defects of the prior art and provides an AC-AC chopper electronic transformer. The AC-AC chopper electronic transformer comprises a bus power supply unit, a chopper unit, a protection output unit, a current sampling unit, a voltage sampling unit, a control unit and a frequency zero crossing sampling unit, wherein the bus power supply unit is connected with the chopper unit, the chopper unit is connected with the protection output unit, the current sampling unit and the voltage sampling unit are respectively connected with the control unit, the bus power supply unit is connected with the frequency zero crossing sampling unit, and the frequency zero crossing sampling unit is connected with the control unit. The bus power supply unit comprises an inductor L3, an inductor L4, a current limiting resistor RS3, an electrolytic capacitor EC5, a diode D2, a diode D8, a diode D1 and a voltage stabilizing capacitor C1, wherein the inductor L4 is connected with the inductor L3 through the current limiting resistor RS3, the electrolytic capacitor EC5 is connected with the inductor L4 in parallel, the diode D2 is connected with the current limiting resistor RS3, the diode D8 is connected with the inductor L3, the diode D1 is connected with the inductor L3, and one end of the voltage stabilizing capacitor C1 is connected between the diode D1 and the inductor L3. The chopper unit comprises a silicon controlled rectifier Q1, wherein the silicon controlled rectifier Q1 is connected with the diode D1. The protection output unit comprises a relay K1, and the relay K1 is connected with the diode D1. The voltage sampling unit comprises a sampling resistor RS2, a sampling resistor R36 and a filter capacitor C13, wherein the sampling resistor RS2 is connected with the controllable silicon Q1, the sampling resistor R36 is respectively connected with the controllable silicon Q1 and the control unit, and the filter capacitor C13 is connected with the sampling resistor R36 in parallel. The current sampling unit comprises a voltage dividing resistor R4, a diode D3, a voltage dividing resistor R12 and a filter capacitor C4, wherein the voltage dividing resistor R4 is connected with the diode D1, the voltage dividing resistor R4 is connected with the diode D3, the diode D3 is connected with the filter capacitor C4, the diode D3 is connected with the control unit, and the voltage dividing resistor R12 is connected with the filter capacitor C4 in parallel. The frequency zero crossing sampling unit comprises a voltage dividing resistor R3, a voltage dividing resistor R5 and a filter capacitor C5, wherein the voltage dividing resistor R3 is connected with the diode D1, the voltage dividing resistor R5 is connected with the voltage dividing resistor R3, and the voltage dividing resistor R3 is connected with the filter capacitor C5 with one end grounded. The control unit comprises a control chip U1. The control device is characterized by further comprising a temperature feedback unit, wherein the temperature feedback unit is connected with the control unit. The temperature feedback unit comprises a thermistor PTC1, a resistor R11 and a resistor R10, wherein the resistor