A transformer no-load energy consumption reduction control system

Abstract

The application discloses a transformer no-load energy consumption reduction control system and belongs to the technical field of transformers. The application comprises a transformer and a control circuit. The surfaces of primary windings and secondary windings in three-phase windings of the transformer are uniformly distributed with input contacts and output contacts. Through the control circuit, the corresponding input contacts and output contacts in the primary windings and the secondary windings can be simultaneously closed and simultaneously conducted, so that the working turns of each phase winding coil of the transformer can be controlled individually, the problem that different proportions of working turns of coils in the transformer windings cause different voltages at the output end of the transformer can be prevented, the flexibility of each phase of the transformer during work is effectively improved, and the energy consumption of the transformer during work is reduced.

Description

Technical Field

[0001] This invention is a control system for reducing no-load energy consumption of transformers, belonging to the technical field of transformers. Background Technology

[0002] A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. When an AC voltage U1 is applied to the primary side of the transformer and the current flowing through the primary winding is I1, this current will generate an alternating magnetic flux in the iron core, causing an electromagnetic connection between the primary and secondary windings. According to the principle of electromagnetic induction, the alternating magnetic flux passing through these two windings will induce an electromotive force, the magnitude of which is proportional to the number of turns of the working coil in the winding and the maximum value of the main magnetic flux. That is, when the primary voltage is U1 and the number of turns of the primary winding is N1, and the secondary voltage is U2 and the number of turns of the secondary winding is N2, then U1 / U2 = N1 / N2.

[0003] When a transformer is operating, if the primary input voltage remains constant even when the transformer load output is zero, the primary winding will continuously operate, generating no-load heat and consuming unnecessary electrical energy. The more working coil turns in the transformer winding, the more heat is generated. Transformers are typically three-phase, with each phase operating independently and each having a different load. That is, while one phase may be unloaded, the other two phases may not be. Existing transformers cannot achieve individual phase control or regulate no-load energy consumption. Therefore, some people skilled in the art have developed a transformer no-load energy consumption reduction control system to overcome the problems mentioned in the background. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide a transformer no-load energy consumption reduction control system to address the above-mentioned shortcomings. In this invention, the same number of input contacts and output contacts are evenly distributed in the primary and secondary windings of the three-phase winding of the transformer. By combining with the control circuit, the corresponding input and output contacts in the primary and secondary windings can be turned on and off. Thus, the number of turns of the working coil in the three-phase winding of the transformer can be controlled, reducing the no-load energy consumption of the transformer and saving electrical energy.

[0005] To solve the above technical problems, the present invention adopts the following technical solution:

[0006] A transformer no-load energy consumption reduction control system includes a transformer and a control circuit. The transformer includes a housing, and a winding is provided inside the housing. There are three windings, which are arranged in a straight and balanced manner. The windings are connected to each other through an iron core. The windings include a primary winding and a secondary winding. The primary winding and the secondary winding are composed of coils. Input contacts are evenly distributed on the surface of the primary winding, and output contacts are evenly distributed on the surface of the secondary winding.

[0007] The upper surface of the housing is fixed with a primary terminal and a secondary terminal. The input contact is connected to the primary terminal via a cable, and the output contact is connected to the secondary terminal via a cable.

[0008] Furthermore, the primary winding of the winding is connected to a high-voltage neutral point at its end, and the secondary winding of the winding is connected to a low-voltage neutral point at its end.

[0009] Furthermore, the number of input contacts and output contacts are the same and correspond one-to-one. The input contacts divide the number of coil turns in the primary winding equally, and the output contacts divide the number of coil turns in the secondary winding equally.

[0010] Furthermore, the control circuit includes a conversion circuit, a switching circuit, and an analog-to-digital circuit. The conversion circuit is located between the input contact and the primary winding, the switching circuit is located on the cable between the input contact and the primary terminal, and the analog-to-digital circuit is located on the surface of the cable between the output contact and the secondary terminal.

[0011] Furthermore, the conversion circuit includes a chip U1, which is a microcontroller, model STM32WBA52CGU6. Pin 41 of chip U1 is connected to pin 1 of crystal oscillator Y1 and one end of capacitor C1. Pin 40 of chip U1 is connected to pin 3 of crystal oscillator Y1 and one end of capacitor C2. The other ends of capacitor C1, capacitor C2, and pin 2 of crystal oscillator Y1 are connected to ground. Pin 36 of chip U1 is connected to one end of resistor R1 and one end of capacitor C3. The other end of resistor R1 is connected to a +3.3V power supply, and the other end of capacitor C3 is connected to ground. Pins 6 and 11 of chip U1 are connected to a +3.3V power supply and one end of capacitor C4. The other end of capacitor C4 is connected to ground. Pins 22, 35, and 43 of chip U1 are connected to a +3.3V power supply, and pin 44 of chip U1 is connected to ground.

[0012] Furthermore, the conversion circuit also includes chip U5, which is an optocoupler of model TLP521. Pin 1 of chip U5 is connected to pin 13 of chip U1, pin 2 of chip U5 is connected to ground, pin 3 of chip U5 is connected to one end of resistor R4, the other end of resistor R4 is connected to a +24V power supply, pin 4 of chip U5 is connected to pin 1 of chip U3, chip U3 is a solid-state relay of model SSR-H3200ZF, pin 2 of chip U3 is connected to ground, pin 3 of chip U3 is connected to the surface of the primary winding coil, pin 4 of chip U3 is connected to an input contact, pin 5 of chip U3 is connected to the surface of the secondary winding coil, and pin 6 of chip U3 is connected to an output contact.

[0013] Furthermore, the analog-to-digital circuit includes module U4 and chip U2. Module U4 is an AC current transmitter with model number AC300-420MA. Module U4 has a detection hole on its upper part, through which a cable passes between the output contact and the secondary terminal. Pin 1 of module U4 is connected to a +24V power supply, pins 2 and 4 of module U4 are connected to a ground wire, and pin 3 of module U4 is connected to pin 7 of chip U2.

[0014] Furthermore, the chip U2 is an analog-to-digital converter chip, model TLV1544. Pins 5, 13, 10, and 12 of chip U2 are connected to a +3.3V power supply and one end of capacitor C6. The other end of capacitor C6 is connected to ground. Pin 15 of chip U2 is connected to one end of resistor R3, one end of capacitor C5, and pin 2 of Zener transistor Q1. The other end of resistor R3 is connected to a +3.3V power supply, and the other end of capacitor C5 is connected to ground. Zener transistor Q1 is model SML4728A. Pins 1 and 3 of Zener transistor Q1 are connected to ground. Pins 11 and 14 of chip U2 are connected to ground.

[0015] Furthermore, pin 3 of chip U2 is connected to pin 1 of chip U1, pin 1 of chip U2 is connected to pin 2 of chip U1, pin 2 of chip U2 is connected to pin 3 of chip U1, and pin 16 of chip U2 is connected to pin 4 of chip U1.

[0016] Furthermore, the switching circuit includes chip U6, which is an optocoupler. The model of chip U6 is TLP521. Pin 1 of chip U6 is connected to pin 48 of chip U1. Pin 2 of chip U6 is connected to ground. Pin 3 of chip U6 is connected to one end of resistor R2. The other end of resistor R2 is connected to a +24V power supply. Pin 4 of chip U6 is connected to the control terminal of AC contactor KM1.

[0017] The present invention adopts the above technical solution and has the following technical effects compared with the prior art:

[0018] 1. In the three-phase winding of the transformer of the present invention, input contacts and output contacts are evenly distributed on the surface of the primary and secondary winding coils. The input contacts divide the number of turns of the coil in the primary winding equally, and the output contacts divide the number of turns of the coil in the secondary winding equally. By controlling the opening and closing of the corresponding input and output contacts, the number of working turns of each phase winding coil of the transformer can be controlled individually, which effectively improves the flexibility of each phase of the transformer during operation and reduces the energy consumption of the transformer during operation.

[0019] 2. The present invention also includes a control circuit that can control the corresponding input and output contacts in the primary and secondary windings to be closed and open simultaneously, preventing the transformer output voltage from being different due to different ratios of working turns in the transformer windings. This improves the stability of the transformer during operation while reducing energy consumption. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to actual scale and orientation.

[0021] Figure 1 This is a schematic diagram of the structural connection of the present invention;

[0022] Figure 2 This is a schematic diagram showing the connection between the conversion circuit and the switching circuit of the present invention;

[0023] Figure 3 This is a schematic diagram of the circuit connection of chip U3 in the conversion circuit of the present invention;

[0024] Figure 4 This is a schematic diagram of the circuit connection of chip U2 in the analog-to-digital circuit of the present invention;

[0025] Figure 5 This is a schematic diagram of the circuit connection of module U4 in the analog-to-digital circuit of this invention.

[0026] Figure 1 In the middle: 1-housing, 2-primary terminal, 3-secondary terminal, 4-primary winding, 5-secondary winding, 6-input contact, 7-output contact, 8-high voltage neutral point, 9-low voltage neutral point, 10-winding. Detailed Implementation

[0027] like Figure 1 As shown, a transformer no-load energy consumption reduction control system includes a transformer and a control circuit. The transformer includes a housing 1, and a winding 10 is provided inside the housing 1. There are three windings 10, which are arranged in a straight line and are connected to each other through an iron core. The winding 10 includes a primary winding 4 and a secondary winding 5, which are composed of coils. The end of the primary winding 4 is connected to a high-voltage neutral point 8, and the end of the secondary winding 5 is connected to a low-voltage neutral point 9. Since the structure and function of the three windings 10 are the same, only one of them will be used as an example below.

[0028] The primary winding 4 has input contacts 6 evenly distributed on its surface, and the secondary winding 5 has output contacts 7 evenly distributed on its surface. The number of input contacts 6 and output contacts 7 are the same and correspond one-to-one. The input contacts 6 divide the number of coil turns in the primary winding 4 equally, and the output contacts 7 divide the number of coil turns in the secondary winding 5 equally.

[0029] The upper surface of the housing 1 is fixed with three primary terminals 2, which are used for wiring the input terminal of the transformer. The upper surface of the housing 1 is also fixed with three secondary terminals 3, which are used for wiring the output terminal of the transformer.

[0030] The input contact 6 is connected to the primary terminal 2 via a cable, and the output contact 7 is connected to the secondary terminal 3 via a cable.

[0031] The control circuit includes a conversion circuit, a switching circuit, and an analog-to-digital circuit. The conversion circuit is located between the input contact 6 and the primary winding 4. The switching circuit is located on the cable between the input contact 6 and the primary terminal 2. The analog-to-digital circuit is located on the surface of the cable between the output contact 7 and the secondary terminal 3.

[0032] like Figure 2 and Figure 3 As shown, the conversion circuit includes chip U1, which is a microcontroller, model STM32WBA52CGU6. Pin 41 of chip U1 is connected to pin 1 of crystal oscillator Y1 and one end of capacitor C1. Pin 40 of chip U1 is connected to pin 3 of crystal oscillator Y1 and one end of capacitor C2. The other ends of capacitor C1, capacitor C2, and pin 2 of crystal oscillator Y1 are connected to ground. Pin 36 of chip U1 is connected to one end of resistor R1 and one end of capacitor C3. The other end of resistor R1 is connected to a +3.3V power supply, and the other end of capacitor C3 is connected to ground. Pins 6 and 11 of chip U1 are connected to a +3.3V power supply and one end of capacitor C4. The other end of capacitor C4 is connected to ground. Pins 22, 35, and 43 of chip U1 are connected to a +3.3V power supply, and pin 44 of chip U1 is connected to ground.

[0033] The conversion circuit also includes chip U5, which is an optocoupler of model TLP521. Pin 1 of chip U5 is connected to pin 13 of chip U1. Pin 2 of chip U5 is connected to ground. Pin 3 of chip U5 is connected to one end of resistor R4, and the other end of resistor R4 is connected to a +24V power supply. Pin 4 of chip U5 is connected to pin 1 of chip U3, which is a solid-state relay of model SSR-H3200ZF. Pin 2 of chip U3 is connected to ground. Pin 3 of chip U3 is connected to the surface of the primary winding coil. Pin 4 of chip U3 is connected to an input contact. Pin 5 of chip U3 is connected to the surface of the secondary winding coil. Pin 6 of chip U3 is connected to an output contact.

[0034] like Figure 4 and Figure 5 As shown, the analog-to-digital circuit includes module U4 and chip U2. Module U4 is an AC current transmitter with model number AC300-420MA. Module U4 has a detection hole on its upper part, through which a cable between the output contact and the secondary terminal passes. Module U4 is used to detect the AC current in the cable between the output contact and the secondary terminal, and then transmit it as a DC signal of 4MA-20MA. Pin 1 of module U4 is connected to a +24V power supply, pins 2 and 4 of module U4 are connected to ground, and pin 3 of module U4 is connected to pin 7 of chip U2.

[0035] The chip U2 is an analog-to-digital converter chip, model TLV1544. Pins 5, 13, 10, and 12 of chip U2 are connected to a +3.3V power supply and one end of capacitor C6. The other end of capacitor C6 is connected to ground. Pin 15 of chip U2 is connected to one end of resistor R3, one end of capacitor C5, and pin 2 of Zener transistor Q1. The other end of resistor R3 is connected to a +3.3V power supply, and the other end of capacitor C5 is connected to ground. Zener transistor Q1 is model SML4728A. Pins 1 and 3 of Zener transistor Q1 are connected to ground. Pins 11 and 14 of chip U2 are connected to ground.

[0036] Pin 3 of chip U2 is connected to pin 1 of chip U1, pin 1 of chip U2 is connected to pin 2 of chip U1, pin 2 of chip U2 is connected to pin 3 of chip U1, and pin 16 of chip U2 is connected to pin 4 of chip U1.

[0037] Module U4 detects the AC current in the cable between the output contact and the secondary terminal, then converts it into a DC signal. This DC signal is input through pins 7, 8, and 9 of chip U2, converted into a digital signal in chip U2, and then input to chip U1 through pins 3, 1, 2, and 16 of chip U2. When the AC current in the cable between a certain output contact and the secondary terminal is zero, i.e., when a certain winding in the transformer is unloaded, chip U3, which connects the lowest input contact and the output contact of that winding, is turned on. At this time, the number of working coil turns in the primary and secondary windings of the transformer is minimized. The head is controlled by the same chip U3, and is simultaneously turned on and off. At this moment, the number of coil turns in the primary winding of the same winding is N1, and the number of coil turns in the secondary winding is N2. Since the input contact divides the number of coil turns in the primary winding equally, and the output contact divides the number of coil turns in the secondary winding equally, the ratio of N1 to N2 is a fixed value. When the transformer input voltage U1 is constant, according to the formula U1 / U2=N1 / N2, the transformer output voltage U2 is also constant. That is, without changing the transformer output voltage, when the output terminal is unloaded, the number of working turns in the transformer is reduced, thus reducing the transformer's energy consumption when unloaded.

[0038] When chip U3 is turned on, pin 2 of chip U3 receives a +24V control power supply. The optocoupler chip U5 connected to chip U3 is also turned on. Pin 13 of chip U1, which is connected to optocoupler chip U5, outputs a high level. Pins 13 to 34 of chip U1 are used to switch the solid-state relays in the conversion circuit on and off, indirectly controlling the corresponding input and output contacts in each winding, and the connection and disconnection between the primary and secondary winding surfaces. Therefore, by switching the corresponding pins between pins 13 and 34 of chip U1 on and off, the number of working turns of the primary and secondary winding coils in the transformer windings can be controlled. Thus, the number of working turns of the coils in the transformer can be controlled according to the magnitude of the transformer output current, effectively reducing the transformer's own energy consumption under no-load or light-load conditions.

[0039] like Figure 2As shown, the switching circuit includes chip U6, which is an optocoupler of model TLP521. Pin 1 of chip U6 is connected to pin 48 of chip U1, pin 2 of chip U6 is connected to ground, pin 3 of chip U6 is connected to one end of resistor R2, and the other end of resistor R2 is connected to a +24V power supply. Pin 4 of chip U6 is connected to the control terminal of AC contactor KM1. When pin 48 of chip U1 outputs a high level, chip U6 conducts, the control terminal of AC contactor KM1 connects to the +24V power supply, AC contactor KM1 is energized, and the primary winding of the transformer is powered on. When module U4 detects that the AC current in the cable between the output contact and the secondary terminal exceeds the transformer's load capacity, pin 48 of U1 outputs a low level, chip U6 is turned off, the control terminal of AC contactor KM1 disconnects the +24V power supply, AC contactor KM1 is disconnected, and the primary winding of the transformer is de-energized and stops working to prevent transformer overload and damage.

[0040] The description of this invention is provided for illustrative purposes and is not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A transformer no-load energy consumption reduction control system, characterized by: Including transformer and control circuit, the transformer includes the shell (1), the shell (1) is provided with winding (10) inside, winding (10) has three, is in straight line balanced arrangement, winding (10) is connected through the iron core between inside, winding (10) includes primary winding (4) and secondary winding (5), primary winding (4) and secondary winding (5) are formed by coil, the surface of primary winding (4) is evenly distributed with input contact (6), the surface of secondary winding (5) is evenly distributed with output contact (7); The upper surface of the shell (1) is fixedly connected with a primary terminal post (2) and a secondary terminal post (3), the input contact (6) is connected with the primary terminal post (2) through a cable, and the output contact (7) is connected with the secondary terminal post (3) through a cable; The control circuit comprises a conversion circuit, a switching circuit and an analog-digital circuit, and the conversion circuit is located between the input contact (6) and the primary winding (4); The conversion circuit comprises a chip U1, the chip U1 is a single-chip microcomputer, the model of the chip U1 is STM32WBA52CGU6, the 41st pin of the chip U1 is connected with the 1st pin of a crystal oscillator Y1 and one end of a capacitor C1, the 40th pin of the chip U1 is connected with the 3rd pin of the crystal oscillator Y1 and one end of a capacitor C2, the other end of the capacitor C1, the other end of the capacitor C2 and the 2nd pin of the crystal oscillator Y1 are connected with a ground wire, the 36th pin of the chip U1 is connected with one end of a resistor R1 and one end of a capacitor C3, the other end of the resistor R1 is connected with a power supply +3.3V, the other end of the capacitor C3 is connected with a ground wire, the 6th pin and the 11th pin of the chip U1 are connected with the power supply +3.3V and one end of a capacitor C4, the other end of the capacitor C4 is connected with a ground wire, the 22nd pin, the 35th pin and the 43rd pin of the chip U1 are connected with the power supply +3.3V, and the 44th pin of the chip U1 is connected with a ground wire; The conversion circuit further comprises a chip U5, the chip U5 is an optocoupler, the model of the chip U5 is TLP521, the 1st pin of the chip U5 is connected with the 13th pin of the chip U1, the 2nd pin of the chip U5 is connected with a ground wire, the 3rd pin of the chip U5 is connected with one end of a resistor R4, the other end of the resistor R4 is connected with a power supply +24V, the 4th pin of the chip U5 is connected with the 1st pin of a chip U3, the chip U3 is a solid-state relay, the model of the chip U3 is SSR-H3200ZF, the 2nd pin of the chip U3 is connected with a ground wire, the 3rd pin of the chip U3 is connected with the surface of the primary winding coil, the 4th pin of the chip U3 is connected with the input contact, the 5th pin of the chip U3 is connected with the surface of the secondary winding coil, and the 6th pin of the chip U3 is connected with the output contact; The analog-digital circuit comprises a module U4 and a chip U2, the module U4 is an alternating current transmitter, the model of the module U4 is AC300-420MA, the upper part of the module U4 is provided with a detection hole, a cable between the output contact and the secondary terminal post penetrates through the detection hole, the 1st pin of the module U4 is connected with a power supply +24V, the 2nd pin and the 4th pin of the module U4 are connected with a ground wire, and the 3rd pin of the module U4 is connected with the 7th pin of the chip U2. The chip U2 is an analog-to-digital conversion chip, the model of the chip U2 is TLV1544, the 5th pin, the 13th pin, the 10th pin and the 12th pin of the chip U2 are connected with a power supply +3.3V and one end of a capacitor C6, the other end of the capacitor C6 is connected with a ground wire, the 15th pin of the chip U2 is connected with one end of a resistor R3, one end of a capacitor C5 and the 2nd pin of a voltage stabilizing triode Q1, the other end of the resistor R3 is connected with the power supply +3.3V, the other end of the capacitor C5 is connected with the ground wire, the model of the voltage stabilizing triode Q1 is SML4728A, the 1st pin and the 3rd pin of the voltage stabilizing triode Q1 are connected with the ground wire, the 11th pin and the 14th pin of the chip U2 are connected with the ground wire; The 3rd pin of the chip U2 is connected with the 1st pin of the chip U1, the 1st pin of the chip U2 is connected with the 2nd pin of the chip U1, the 2nd pin of the chip U2 is connected with the 3rd pin of the chip U1, and the 16th pin of the chip U2 is connected with the 4th pin of the chip U1.

2. The transformer no-load energy consumption reduction control system of claim 1, wherein: The end of the primary winding (4) in the winding (10) is connected with a high-voltage neutral point (8), and the end of the secondary winding (5) in the winding (10) is connected with a low-voltage neutral point (9).

3. The transformer no-load energy consumption reduction control system of claim 1, wherein: The number of the input contact (6) is the same as that of the output contact (7), and they are one-to-one corresponding, the input contact (6) divides the number of turns of the coil in the primary winding (4) into two equal parts, and the output contact (7) divides the number of turns of the coil in the secondary winding (5) into two equal parts.

4. The transformer no-load energy consumption reduction control system of claim 1, wherein: The switch circuit is located on the cable between the input contact (6) and the primary terminal post (2), and the analog-digital circuit is located on the surface of the cable between the output contact (7) and the secondary terminal post (3).

5. A control system for reducing no-load energy consumption of a transformer as recited in claim 4, wherein: The switch circuit comprises a chip U6, the chip U6 is an optical coupler, the model of the chip U6 is TLP521, the 1st pin of the chip U6 is connected with the 48th pin of the chip U1, the 2nd pin of the chip U6 is connected with a ground wire, the 3rd pin of the chip U6 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with a power supply +24V, and the 4th pin of the chip U6 is connected with the control end of an alternating current contactor KM1.

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