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CN-224233562-U - AC-AC sine wave electronic transformer

CN224233562UCN 224233562 UCN224233562 UCN 224233562UCN-224233562-U

Abstract

The utility model discloses an AC-AC sine wave electronic transformer which comprises a rectifying and filtering unit, an inversion unit, an output unit, a zero sampling unit and a control unit, wherein the rectifying and filtering unit is connected with the inversion unit, the output unit is connected with the inversion unit, the zero sampling unit is used for collecting the input grid frequency and the grid zero crossing position to obtain a sampling result, and the control unit is used for adjusting the inversion unit according to the sampling result to ensure that the output frequency and the phase are identical to the input grid evaluation rate and the input grid zero crossing position. The transformer can greatly simplify circuit design and reduce energy loss, thereby improving conversion efficiency, reducing weight and reducing volume.

Inventors

  • SHEN XUEMEI

Assignees

  • 深圳市华菱电源有限公司

Dates

Publication Date
20260512
Application Date
20250527

Claims (10)

  1. 1. The AC-AC sine wave electronic transformer is characterized by comprising a rectifying and filtering unit, an inversion unit, an output unit, a zero sampling unit and a control unit, wherein the rectifying and filtering unit is connected with the inversion unit, the output unit is connected with the inversion unit, the zero sampling unit is used for collecting input grid frequency and grid zero crossing positions to obtain sampling results, and the control unit is used for adjusting the inversion unit according to the sampling results to ensure that the output frequency and phase are identical to the input grid evaluation rate and the input grid zero crossing positions.
  2. 2. An AC-AC sine wave electronic transformer according to claim 1, further comprising a voltage sampling unit for collecting the voltage of the output unit for input to the control unit for providing the control unit with a modulation direction.
  3. 3. An AC-AC sine wave electronic transformer according to claim 2, further comprising a current sampling unit for collecting current from the output unit for input to the control unit for providing a modulation direction for the control unit.
  4. 4. An AC-AC sine wave electronic transformer according to claim 3, wherein said inverter unit comprises a first step-down subunit connected to said rectifying and filtering unit, and said output unit is connected to said first step-down subunit.
  5. 5. An AC-AC sine wave electronic transformer as recited in claim 4, further comprising a second step-down subunit coupled to the AC power output.
  6. 6. The AC-AC sine wave electronic transformer according to claim 5, wherein the rectifying and filtering unit comprises a rectifying bridge DB1, a filtering capacitor E1 and a filtering capacitor E2, the rectifying bridge DB1 is connected to the AC output terminal, and the filtering capacitor E1 and the filtering capacitor E2 are connected in parallel and then connected between the rectifying bridge DB1 and the first step-down subunit.
  7. 7. The AC-AC sine wave electronic transformer according to claim 6, wherein the first step-down subunit comprises a MOS tube Q1, a MOS tube Q3, an inductor L1 and a capacitor C7, wherein the MOS tube Q1 is connected with the MOS tube Q3, the MOS tube Q1 and the MOS tube Q3 are respectively connected with the rectifier bridge DB1, the inductor L1 is respectively connected with the MOS tube Q1 and the MOS tube Q3, the inductor L1 is connected with the current sampling unit, and the current sampling unit is connected with the capacitor C7.
  8. 8. The AC-AC sine wave electronic transformer according to claim 7, wherein the output unit comprises a MOS transistor Q2 and a MOS transistor Q4, and the MOS transistor Q2 and the MOS transistor Q4 are respectively connected with the inductor L1.
  9. 9. The AC-AC sine wave electronic transformer according to claim 5, wherein the zero point sampling unit comprises a rectifier bridge DB2, a resistor R29, a resistor R30, a resistor R31, a resistor R32 and a capacitor C26, the control unit comprises a control chip U6, the rectifier bridge DB2, the resistor R29, the resistor R30 and the resistor R31 are sequentially connected, the resistor R31 is respectively connected with the resistor R32 and the capacitor C26, and the resistor R31 is connected with the control chip U6.
  10. 10. The AC-AC sine wave electronic transformer according to claim 9, wherein the second step-down subunit comprises a step-down chip U4, an inductor L2, a capacitor D18, and a capacitor E4, the step-down chip U4 is connected to the inductor L2, one end of the capacitor D18 is connected to one end of the inductor L2 connected to the step-down chip U4, and one end of the capacitor E4 is connected to one end of the inductor L2 connected to the control chip U6.

Description

AC-AC sine wave electronic transformer Technical Field The utility model relates to the technical field of transformers, in particular to an AC-AC sine wave electronic transformer. Background When the existing transformer is used for realizing voltage conversion, the input voltage is usually reduced to a required level through a DC/DC voltage reduction circuit, and then the input voltage is converted into alternating current output through an inverter. In addition, the two-step conversion mode needs a larger energy storage capacitor to maintain the stability of the system, further increases the volume and weight of the product, makes the product perform poorly in portability, and is difficult to meet the requirements of modern users on light-weight and high-efficiency equipment. Therefore, there is a need to design a new transformer, which greatly simplifies the circuit design and reduces the energy loss, thereby improving the conversion efficiency, reducing the weight and reducing the volume. Disclosure of utility model The utility model aims to overcome the defects of the prior art and provides an AC-AC sine wave electronic transformer. The AC-AC sine wave electronic transformer comprises a rectifying and filtering unit, an inversion unit, an output unit, a zero sampling unit and a control unit, wherein the rectifying and filtering unit is connected with the inversion unit, the output unit is connected with the inversion unit, the zero sampling unit is used for collecting input grid frequency and grid zero crossing positions to obtain sampling results, and the control unit is used for adjusting the inversion unit according to the sampling results to ensure that output frequency and phase are identical to the input grid evaluation rate and the input grid zero crossing positions. The voltage sampling unit is used for collecting the voltage of the output unit and inputting the voltage to the control unit so as to provide a modulation direction for the control unit. The current sampling unit is used for collecting the current of the output unit and inputting the current to the control unit so as to provide a modulation direction for the control unit. The inverter comprises a first voltage reduction subunit, wherein the first voltage reduction subunit is connected with the rectifying and filtering unit, and the output unit is connected with the first voltage reduction subunit. The power supply device further comprises a second voltage reduction subunit which is connected with the alternating current output end. The rectifying and filtering unit comprises a rectifying bridge DB1, a filtering capacitor E1 and a filtering capacitor E2, wherein the rectifying bridge DB1 is connected with an alternating current output end, and the filtering capacitor E1 and the filtering capacitor E2 are connected in parallel and then connected between the rectifying bridge DB1 and the first voltage-reducing subunit. The first voltage reduction subunit comprises a MOS tube Q1, a MOS tube Q3, an inductor L1 and a capacitor C7, wherein the MOS tube Q1 is connected with the MOS tube Q3, the MOS tube Q1 and the MOS tube Q3 are respectively connected with the rectifier bridge DB1, the inductor L1 is respectively connected with the MOS tube Q1 and the MOS tube Q3, the inductor L1 is connected with the current sampling unit, and the current sampling unit is connected with the capacitor C7. The output unit comprises an MOS tube Q2 and an MOS tube Q4, wherein the MOS tube Q2 and the MOS tube Q4 are respectively connected with the inductor L1. The zero sampling unit comprises a rectifier bridge DB2, a resistor R29, a resistor R30, a resistor R31, a resistor R32 and a capacitor C26, wherein the control unit comprises a control chip U6, the rectifier bridge DB2, the resistor R29, the resistor R30 and the resistor R31 are sequentially connected, the resistor R31 is respectively connected with the resistor R32 and the capacitor C26, and the resistor R31 is connected with the control chip U6. The second voltage reducing subunit comprises a voltage reducing chip U4, an inductor L2, a capacitor D18 and a capacitor E4, wherein the voltage reducing chip U4 is connected with the inductor L2, one end of the capacitor D18 is connected with one end of the inductor L2 connected with the voltage reducing chip U4, and one end of the capacitor E4 is connected with one end of the inductor L2 connected with the control chip U6. Compared with the prior art, the utility model has the beneficial effects that the zero sampling unit is utilized to accurately collect the frequency and zero crossing position information of the power grid through integrating the rectifying and filtering unit, the inversion unit, the output unit, the zero sampling unit and the control unit, and the control unit adjusts the working state of the inversion unit accordingly, so that the output alternating current is ensured to keep consistent with the input power grid in frequency and phas