Transformer capable of outputting double voltages

Abstract

The utility model discloses a transformer capable of outputting double voltages, and belongs to the technical field of transformer circuits. The device mainly comprises a mains supply and a transformer, the transformer comprises a primary winding N1, a first secondary winding N2 and a second secondary winding N3, the primary winding N1 is in magnetic induction coupling with the first secondary winding N2 and the second secondary winding N3, and the output end of the first secondary winding N2 and the output end of the second secondary winding N3 are connected with a filtering and rectifying module. The output end of the filter rectifier module is electrically connected with the input end of the differential mode filter module, the output end of the differential mode filter module is electrically connected with the common mode filter module, and the differential mode filter module and the common mode filter module are connected to the first secondary line set and the second secondary line set respectively. The high-frequency noise and the pulsating voltage of the output 400V and 690V voltage can be filtered again through the differential-mode filtering module and the common-mode filtering module, so that the output voltage can be smoothly output, the influence on access equipment is reduced, and the stable operation of the system is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of transformer circuits, and specifically to a transformer with dual voltage output. Background Art

[0002] A transformer is an electrical device used to transfer electrical energy between different voltages. Its basic principle is electromagnetic induction, and electrical energy transfer is achieved by changing the voltage of the current. A transformer usually consists of two windings (primary winding and secondary winding) and an iron core. The primary winding is connected to the power supply, and the secondary winding is connected to the load.

[0003] After retrieval, the publication number CN207705004U discloses a transformer with low-voltage dual voltage output, including a primary side wiring terminal, a secondary side wiring terminal, and three groups of coil units. The primary side wiring terminal is provided with three groups of single-phase wiring input terminal units, and the secondary side wiring terminal is provided with three single-phase wiring output terminals. Each group of single-phase wiring input terminal units includes a first single-phase wiring terminal and a second single-phase wiring terminal. Each first single-phase wiring terminal is sequentially connected to the corresponding single-phase wiring output terminal in the secondary side wiring terminal through the first coil, the third coil, and the second coil in the corresponding group of coil units to form the output of the first working voltage; each second single-phase wiring terminal is connected to the corresponding single-phase wiring output terminal in the secondary side wiring terminal through the second coil in the corresponding group of coil units to form the output of the second working voltage. Under both working voltages, the ampere-turn balance of the high and low voltage coils is ensured, and the impedance difference of the transformer is within the deviation range.

[0004] However, during the process of converting mains electricity into two different voltages through a transformer, there will be noise in the circuit, which may cause voltage instability. For example, when the mains electricity is converted into output voltages of 400V and 690V, it will cause unstable fluctuations in the output voltage, affecting the normal operation of the connected devices. At the same time, the noise may cause electromagnetic interference, affecting the normal operation of surrounding devices.

[0005] Therefore, it is necessary to provide a transformer with dual voltage output to solve the above problems.

[0006] It should be noted that the above information disclosed in this background art section is only used to understand the background art of the concept of the present application, and therefore, it may include information that does not constitute prior art. Summary of the Utility Model

[0007] The purpose of the present utility model is to provide a transformer with dual voltage output to solve the problems raised in the above background art.

[0008] The technical solution adopted by the present application to solve its technical problems is:

[0009] A transformer with dual-voltage output, including the mains power supply and the transformer. The transformer includes a primary winding N1, a first secondary winding N2, and a second secondary winding N3. The primary winding N1 is magnetically coupled to the first secondary winding N2 and the second secondary winding N3 respectively. The output terminals of the first secondary winding N2 and the second secondary winding N3 are connected to a filter rectification module. The output terminal of the filter rectification module is electrically connected to the input terminal of a differential-mode filter module. The output terminal of the differential-mode filter module is electrically connected to a common-mode filter module.

[0010] Preferably, the number of turns of the primary winding N1 is 100 turns. The turns ratio of the primary winding N1 to the first secondary winding N2 is 182 turns. The turns ratio of the primary winding N1 to the second secondary winding N3 is 314 turns.

[0011] Preferably, the mains power supply is 220V~. A capacitor C1 is connected in parallel between the 220V~ and the primary winding N1.

[0012] Preferably, the filter rectification module includes a diode D1, a diode D2, a capacitor C2, and a capacitor C3. One end of the first secondary winding N2 is electrically connected to one end of the diode D1. The other end of the diode D1 and the other end of the first secondary winding N2 are connected in parallel with the capacitor C2.

[0013] One end of the second secondary winding N3 is electrically connected to one end of the diode D2. The other end of the diode D2 and the other end of the second secondary winding N2 are connected in parallel with the capacitor C3.

[0014] Preferably, the differential-mode filter module includes an inductor L1, an inductor L2, an inductor L3, an inductor L4, a capacitor C4, and a capacitor C5. One end of the inductor L1 and the inductor L2 is connected in parallel with the capacitor C2. The other end of the inductor L1 and the inductor L2 is connected in parallel with the capacitor C4.

[0015] One end of the inductor L3 and the inductor L4 is connected in parallel with the capacitor C3. The other end of the inductor L3 and the inductor L4 is connected in parallel with the capacitor C5.

[0016] Preferably, the common-mode filter module includes an inductor L5, an inductor L6, an inductor L7, an inductor L8, a capacitor C6, a capacitor C7, a capacitor C8, and a capacitor C9. One end of the inductor L5 and the inductor L6 is connected in parallel with the capacitor C4. The other end of the inductor L5 is connected to one end of the capacitor C6. The other end of the inductor L6 is connected to one end of the capacitor C7. The other ends of the capacitor C6 and the capacitor C7 are grounded together.

[0017] One end of the inductor L7 and the inductor L8 is connected in parallel with the capacitor C5. The other end of the inductor L7 is connected to one end of the capacitor C8. The other end of the inductor L8 is connected to one end of the capacitor C9. The other ends of the capacitor C8 and the capacitor C9 are grounded together.

[0018] The voltage between the other ends of the inductors L5 and L6 is 400V, and the voltage between the other ends of the inductors L7 and L8 is 690V.

[0019] The beneficial effects of the present application are as follows:

[0020] By adding a capacitor between the mains power supply and the primary winding group of the transformer to reduce the influence of high-frequency noise on the primary winding. At the same time, a differential-mode filtering module and a common-mode filtering module are respectively connected to the first secondary winding group and the second secondary winding group, so that the differential-mode filtering module and the common-mode filtering module can filter out high-frequency noise and pulsating voltage from the output 400V and 690V voltages again, enabling the output voltage to be smoothly output, reducing the influence on the connected devices, and ensuring the stable operation of the system.

[0021] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings forming a part of this application are used to provide a further understanding of the present application. The schematic embodiments and descriptions thereof of the present application are used to explain the present application and do not constitute an improper limitation of the present application.

[0023] In the drawings:

[0024] Figure 1 is the system block diagram of the transformer with dual-voltage output of the present utility model;

[0025] Figure 2 is the circuit diagram of the transformer with dual-voltage output of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0027] To enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of this application.

[0028] Please refer to Figure 1-2 , the embodiments provided by the present utility model:

[0029] A transformer with dual-voltage output includes a mains power supply and a transformer. The mains power supply is 220V~. The transformer includes a primary winding N1, a first secondary winding N2, and a second secondary winding N3. The primary winding N1 is magnetically coupled to the first secondary winding N2 and the second secondary winding N3 respectively. In order to convert the mains power supply into the required output voltages of 400V and 690V through the transformer, it is necessary to limit the number of turns of the primary winding N1, the first secondary winding N2, and the second secondary winding N3. The number of turns of the primary winding N1 is 100 turns, and the mains power supply is 220V~. According to the basic formula of the transformer, the turns ratio of the primary winding N1 to the first secondary winding N2 is 182 turns, and the turns ratio of the primary winding N1 to the second secondary winding N3 is 314 turns. After the 220V~ passes through the magnetic coupling of the primary winding N1 to the first secondary winding N2 and the second secondary winding N3 respectively, the output of the first secondary winding N2 is 400V, and the output of the second secondary winding N3 is 690V, enabling the transformer to output dual voltages for different devices to use.

[0030] Among them, a capacitor C1 is connected in parallel between the 220V~ and the primary winding N1, so that the 220V~ passes through the capacitor C1 for filtering to remove high-frequency noise to the primary winding N1 to ensure the stability of the input voltage.

[0031] Filtering and rectifying modules are connected to the output ends of the first secondary winding N2 and the second secondary winding N3. The filtering and rectifying modules include a diode D1, a diode D2, a capacitor C2, and a capacitor C3. One end of the first secondary winding N2 is electrically connected to one end of the diode D1, and the other end of the diode D1 and the other end of the first secondary winding N2 are connected in parallel with the capacitor C2;

[0032] One end of the second secondary winding N3 is electrically connected to one end of the diode D2, and the other end of the diode D2 and the other end of the second secondary winding N2 are connected in parallel with the capacitor C3.

[0033] Two filter rectification modules respectively composed of diode D1, diode D2, capacitor C2 and capacitor C3 are used to rectify and filter the output 400V voltage and 690V voltage. Capacitors C2 and C3 can effectively filter out high-frequency noise and pulsating voltage, smooth the output voltage, and diodes D1 and D2 convert alternating current into direct current.

[0034] The output end of the filter rectification module is electrically connected to the input end of the differential mode filter module, and the output end of the differential mode filter module is electrically connected to the common mode filter module.

[0035] Specifically, the differential mode filter module includes inductor L1, inductor L2, inductor L3, inductor L4, capacitor C4 and capacitor C5. One end of inductor L1 and inductor L2 is connected in parallel with capacitor C2, and the other end of inductor L1 and inductor L2 is connected in parallel with capacitor C4;

[0036] One end of inductor L3 and inductor L4 is connected in parallel with capacitor C3, and the other end of inductor L3 and inductor L4 is connected in parallel with capacitor C5.

[0037] The differential mode inductors composed of inductor L1 and inductor L2 and the differential mode inductors composed of inductor L3 and inductor L4 can respectively filter the differential mode noise in the 400V and 690V lines, and can further suppress the noise in the circuit.

[0038] The common mode filter module includes inductor L5, inductor L6, inductor L7, inductor L8, capacitor C6, capacitor C7, capacitor C8 and capacitor C9. One end of inductor L5 and inductor L6 is connected in parallel with capacitor C4. The other end of inductor L5 is connected to one end of capacitor C6, and the other end of inductor L6 is connected to one end of capacitor C7. The other ends of capacitor C6 and capacitor C7 are grounded together;

[0039] One end of inductor L7 and inductor L8 is connected in parallel with capacitor C5. The other end of inductor L7 is connected to one end of capacitor C8, and the other end of inductor L8 is connected to one end of capacitor C9. The other ends of capacitor C8 and capacitor C9 are grounded together;

[0040] The common mode transformers composed of inductor L5 and inductor L6 and the common mode transformers composed of inductor L7 and inductor L (should be L8 here) are used to filter the common mode noise, that is, the noise that appears between the power line and the ground line.

[0041] The voltage between the other ends of inductor L5 and L6 is 400V, and the voltage between the other ends of inductor L7 and inductor L8 is 690V. The differential mode inductors and common mode inductors act as low-pass filters. They do not block the direct current because the impedance of the inductor is basically zero under direct current. These differential mode inductors and common mode inductors can filter out these unwanted components, so as to smooth the output voltages of 400V and 690V and reduce the power noise.

[0042] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A transformer capable of dual voltage output, comprising a mains supply and a transformer, characterized in that: The transformer includes a primary winding N1, a first secondary winding N2 and a second secondary winding N3, the primary winding N1 is magnetically coupled with the first secondary winding N2 and the second secondary winding N3 respectively, the output ends of the first secondary winding N2 and the second secondary winding N3 are connected to a filter rectifier module, the output end of the filter rectifier module is electrically connected to the input end of the differential mode filter module, and the output end of the differential mode filter module is electrically connected to the common mode filter module.

2. A transformer capable of dual voltage output according to claim 1, characterized in that: The number of turns of the primary winding N1 is 100 turns, the turn ratio of the primary winding N1 to the first secondary winding N2 is 182 turns, and the turn ratio of the primary winding N1 to the second secondary winding N3 is 314 turns.

3. A transformer capable of dual voltage output according to claim 2, characterized in that: The mains power is 220V~, and a capacitor C1 is connected in parallel between the 220V~ and the primary winding N1.

4. A transformer capable of dual voltage output according to claim 3, characterized in that: The filtering and rectifying module comprises a diode D1, a diode D2, a capacitor C2 and a capacitor C3, one end of the first secondary winding N2 is electrically connected to one end of the diode D1, and the other end of the diode D1 and the other end of the first secondary winding N2 are connected in parallel with the capacitor C2; One end of the second secondary winding N3 is electrically connected to one end of the diode D2 , and the other end of the diode D2 and the other end of the second secondary winding N2 are connected in parallel with a capacitor C3 .

5. A transformer capable of dual voltage output according to claim 4, characterized in that: The differential mode filter module includes an inductor L1, an inductor L2, an inductor L3, an inductor L4, a capacitor C4 and a capacitor C5, one end of the inductor L1 and the inductor L2 is connected in parallel with the capacitor C2, and the other end of the inductor L1 and the inductor L2 is connected in parallel with the capacitor C4; One end of the inductor L3 and the inductor L4 is connected in parallel with the capacitor C3, and the other end of the inductor L3 and the inductor L4 is connected in parallel with the capacitor C5.

6. The transformer capable of dual voltage output according to claim 5, characterized in that: The common mode filter module includes an inductor L5, an inductor L6, an inductor L7, an inductor L8, a capacitor C6, a capacitor C7, a capacitor C8 and a capacitor C9, one end of the inductor L5 and the inductor L6 is connected in parallel with the capacitor C4, the other end of the inductor L5 is connected to one end of the capacitor C6, the other end of the inductor L6 is connected to one end of the capacitor C7, and the other end of the capacitor C6 and the other end of the capacitor C7 are grounded; One end of the inductor L7 and the inductor L8 is connected in parallel with the capacitor C5, the other end of the inductor L7 is connected to one end of the capacitor C8, the other end of the inductor L8 is connected to one end of the capacitor C9, and the other end of the capacitor C8 and the other end of the capacitor C9 are grounded; The voltage between the other ends of the inductors L5 and L6 is 400V, and the voltage between the other ends of the inductors L7 and L8 is 690V.

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