Transformer no-load energy consumption reduction control system

Abstract

The invention discloses a transformer no-load energy consumption reduction control system, and belongs to the technical field of transformers, the transformer no-load energy consumption reduction control system comprises a transformer and a control circuit, input contacts and output contacts are uniformly distributed on coil surfaces of a primary winding and a secondary winding in a three-phase winding of the transformer, and the input contacts and the output contacts are connected through the control circuit. According to the utility model, corresponding input contacts and output contacts in the primary winding and the secondary winding can be controlled to be switched off and switched on at the same time, so that the number of working turns of each phase of winding coil of the transformer can be independently controlled, and the problem of different voltage at the output end of the transformer caused by different proportions of the working turns of the coils in the winding of the transformer can be prevented; while the energy consumption of the transformer is reduced, the working flexibility of each phase of the transformer is effectively improved, and the energy consumption of the transformer during working is reduced.

Description

Technical Field

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

[0002] A transformer is a device that uses the principle of electromagnetic induction to change the 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, an alternating magnetic flux will be generated in the iron core. This magnetic flux will cause electromagnetic connection between the primary winding and the secondary winding. According to the principle of electromagnetic induction, when the alternating magnetic flux passes through these two windings, electromotive forces will be induced. The magnitude of the electromotive force 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 side voltage is U1, the number of turns of the primary winding is N1, the secondary side voltage is U2, and the number of turns of the secondary winding is N2, then U1 / U2 = N1 / N2.

[0003] When the transformer is working, when the load output end of the transformer is zero, if the primary side input voltage always exists, then the primary winding will always work, and the primary winding will generate no-load heat and consume unnecessary electric energy. The more turns of the working coil in the transformer winding, the more heat will be generated. Usually, the transformer is divided into three phases. When working, each phase works independently, and the load of each phase will also be different. That is, when one phase of the transformer is no-load, the other two phases may not be in the no-load state. The existing transformers cannot achieve separate control of each phase and cannot adjust the power consumption during no-load. For this reason, some technicians in this field have developed a control system for reducing no-load energy consumption of a transformer to overcome the problems in the above background art. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a control system for reducing no-load energy consumption of a transformer in view of the above deficiencies. In the primary winding and secondary winding of the three-phase windings of the transformer, the same number of input contacts and output contacts are evenly divided. By combining with the control circuit, the conduction and closing of the corresponding input contacts and output contacts in the primary winding and secondary winding are realized. Thus, the number of turns of the working coils in the three-phase windings of the transformer can be controlled, the no-load energy consumption of the transformer is reduced, and electric energy is saved.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions: A control system for reducing no-load energy consumption of a transformer 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 line and evenly. The windings are connected to each other through an iron core inside. The winding includes 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; A primary terminal and a secondary terminal are fixedly connected to the upper surface of the housing. The input contact is connected to the primary terminal through a cable, and the output contact is connected to the secondary terminal through a cable.

[0006] Furthermore, the end of the primary winding in the winding is connected to a high-voltage neutral point, and the end of the secondary winding in the winding is connected to a low-voltage neutral point.

[0007] Furthermore, the number of input contacts is the same as that of output contacts and they are in one-to-one correspondence. The input contacts divide the number of turns of the coils in the primary winding equally, and the output contacts divide the number of turns of the coils in the secondary winding equally.

[0008] 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. The analog-to-digital circuit is located on the surface of the cable between the output contact and the secondary terminal.

[0009] Furthermore, the conversion circuit includes a chip U1. Chip U1 is a single-chip microcomputer, and the model of chip U1 is STM32WBA52CGU6. The 41st pin of chip U1 is connected to the 1st pin of crystal oscillator Y1 and one end of capacitor C1. The 40th pin of chip U1 is connected to the 3rd pin of crystal oscillator Y1 and one end of capacitor C2. The other ends of capacitor C1, capacitor C2, and the 2nd pin of crystal oscillator Y1 are connected to the ground wire. The 36th pin 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 the power supply +3.3V, and the other end of capacitor C3 is connected to the ground wire. The 6th and 11th pins of chip U1 are connected to the power supply +3.3V and one end of capacitor C4. The other end of capacitor C4 is connected to the ground wire. The 22nd, 35th, and 43rd pins of chip U1 are connected to the power supply +3.3V, and the 44th pin of chip U1 is connected to the ground wire.

[0010] Furthermore, the conversion circuit further includes a chip U5. Chip U5 is an optocoupler, and the model of chip U5 is TLP521. The 1st pin of chip U5 is connected to the 13th pin of chip U1. The 2nd pin of chip U5 is connected to the ground wire. The 3rd pin of chip U5 is connected to one end of resistor R4. The other end of resistor R4 is connected to the power supply +24V. The 4th pin of chip U5 is connected to the 1st pin of chip U3. Chip U3 is a solid-state relay, and the model of chip U3 is SSR-H3200ZF. The 2nd pin of chip U3 is connected to the ground wire. The 3rd pin of chip U3 is connected to the surface of the primary winding coil. The 4th pin of chip U3 is connected to the input contact. The 5th pin of chip U3 is connected to the surface of the secondary winding coil. The 6th pin of chip U3 is connected to the output contact.

[0011] Further, the analog-digital circuit includes module U4 and chip U2. Module U4 is an AC current transmitter, and its model is AC300-420MA. There is a detection hole in the upper part of module U4, and a cable between the output contact and the secondary terminal passes through the detection hole. Pin 1 of module U4 is connected to the power supply +24V, pins 2 and 4 of module U4 are connected to the ground wire, and pin 3 of module U4 is connected to pin 7 of chip U2.

[0012] Further, chip U2 is an analog-to-digital conversion chip, and its model is TLV1544. Pins 5, 13, 10, and 12 of chip U2 are connected to one end of capacitor C6 and the power supply +3.3V, and the other end of capacitor C6 is connected to the ground wire. Pin 15 of chip U2 is connected to one end of resistor R3, one end of capacitor C5, and pin 2 of voltage-regulating triode Q1. The other end of resistor R3 is connected to the power supply +3.3V, the other end of capacitor C5 is connected to the ground wire. The model of voltage-regulating triode Q1 is SML4728A. Pins 1 and 3 of voltage-regulating triode Q1 are connected to the ground wire, and pins 11 and 14 of chip U2 are connected to the ground wire.

[0013] Further, 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.

[0014] Further, the switch circuit includes chip U6. Chip U6 is an optocoupler, and its model is TLP521. Pin 1 of chip U6 is connected to pin 48 of chip U1, pin 2 of chip U6 is connected to the ground wire, pin 3 of chip U6 is connected to one end of resistor R2, the other end of resistor R2 is connected to the power supply +24V, and pin 4 of chip U6 is connected to the control end of AC contactor KM1.

[0015] The present invention adopts the above technical solutions. Compared with the prior art, it has the following technical effects: 1. On the surfaces of the primary winding and the secondary winding coils in the three-phase windings of the transformer of the present invention, input contacts and output contacts are evenly distributed. 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 conduction and closing of the corresponding input contacts and output contacts, the working turns of each phase winding coil of the transformer can be controlled separately, effectively improving the flexibility of each phase of the transformer during operation and reducing the energy consumption of the transformer during operation.

[0016] 2. The present invention also has a control circuit that can control the corresponding input contacts and output contacts in the primary winding and the secondary winding to be closed and conducted simultaneously, preventing the problem that the voltage at the output end of the transformer is different due to different working turn ratios in the transformer windings. While reducing the energy consumption of the transformer, the stability of the transformer during operation is improved. Brief Description of the Drawings

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally denoted by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to actual scale and orientation.

[0018] Figure 1 It is a schematic diagram of the structural connection of the present invention; Figure 2 It is a schematic diagram of the connection principle of the conversion circuit and the switch circuit of the present invention; Figure 3 It is a schematic diagram of the circuit connection of chip U3 in the conversion circuit of the present invention; Figure 4 It is a schematic diagram of the circuit connection of chip U2 in the analog-to-digital circuit of the present invention; Figure 5 It is a schematic diagram of the circuit connection of module U4 in the analog-to-digital circuit of the present invention.

[0019] Figure 1 Among them: 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 Description of the Invention

[0020] As Figure 1 shown, a control system for reducing no-load energy consumption of a transformer 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 linearly and evenly. The windings 10 are connected to each other through an iron core inside. The winding 10 includes a primary winding 4 and a secondary winding 5. The primary winding 4 and the secondary winding 5 are composed of coils. The ends of the primary windings 4 in the three windings 10 are connected to a high-voltage neutral point 8, and the ends of the secondary windings 5 in the three windings 10 are connected to a low-voltage neutral point 9. Since the structures and functions of the three windings 10 are the same, only one of them will be taken as an example for illustration below.

[0021] The input contacts 6 are evenly distributed on the surface of the primary winding 4, and the output contacts 7 are evenly distributed on the surface of the secondary winding 5. The number of input contacts 6 is the same as that of the output contacts 7 and they are in one-to-one correspondence. The input contacts 6 divide the number of turns of the coils in the primary winding 4 equally, and the output contacts 7 divide the number of turns of the coils in the secondary winding 5 equally.

[0022] On the upper surface of the housing 1, a primary terminal 2 is fixedly connected. There are three primary terminals 2, which are used for wiring the input end of the transformer. On the upper surface of the housing 1, a secondary terminal 3 is also fixedly connected. There are three secondary terminals 3, which are used for wiring the output end of the transformer.

[0023] The input contact 6 is connected to the primary terminal 2 through a cable, and the output contact 7 is connected to the secondary terminal 3 through a cable.

[0024] 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.

[0025] As Figure 2 and Figure 3 shown, the conversion circuit includes a chip U1. The chip U1 is a single-chip microcomputer, and the model of the chip U1 is STM32WBA52CGU6. The 41st pin of the chip U1 is connected to the 1st pin of the crystal oscillator Y1 and one end of the capacitor C1. The 40th pin of the chip U1 is connected to the 3rd pin of the crystal oscillator Y1 and one end of the capacitor C2. The other ends of the capacitor C1, the capacitor C2, and the 2nd pin of the crystal oscillator Y1 are connected to the ground wire. The 36th pin of the chip U1 is connected to one end of the resistor R1 and one end of the capacitor C3. The other end of the resistor R1 is connected to the power supply +3.3V, and the other end of the capacitor C3 is connected to the ground wire. The 6th and 11th pins of the chip U1 are connected to the power supply +3.3V and one end of the capacitor C4. The other end of the capacitor C4 is connected to the ground wire. The 22nd, 35th, and 43rd pins of the chip U1 are connected to the power supply +3.3V, and the 44th pin of the chip U1 is connected to the ground wire.

[0026] The conversion circuit further includes a chip U5. The chip U5 is an optocoupler, and the model of the chip U5 is TLP521. The 1st pin of the chip U5 is connected to the 13th pin of the chip U1. The 2nd pin of the chip U5 is connected to the ground wire. The 3rd pin of the chip U5 is connected to one end of the resistor R4. The other end of the resistor R4 is connected to the power supply +24V. The 4th pin of the chip U5 is connected to the 1st pin of the chip U3. The chip U3 is a solid-state relay, and the model of the chip U3 is SSR-H3200ZF. The 2nd pin of the chip U3 is connected to the ground wire. The 3rd pin of the chip U3 is connected to the surface of the primary winding coil. The 4th pin of the chip U3 is connected to the input contact. The 5th pin of the chip U3 is connected to the surface of the secondary winding coil. The 6th pin of the chip U3 is connected to the output contact.

[0027] As Figure 4 and Figure 5As shown in the figure, the analog-digital circuit includes module U4 and chip U2. Module U4 is an AC current transmitter, and its model is AC300-420MA. There is a detection hole on the upper part of module U4, and a cable between the output contact and the secondary terminal passes through the detection hole. Module U4 is used to detect the AC current in the cable between the output contact and the secondary terminal, and then convert it into a DC signal of 4MA-20MA. Pin 1 of module U4 is connected to the power supply +24V, pins 2 and 4 of module U4 are connected to the ground wire, and pin 3 of module U4 is connected to pin 7 of chip U2.

[0028] Chip U2 is an analog-digital conversion chip, and its model is TLV1544. Pins 5, 13, 10, and 12 of chip U2 are connected to one end of the power supply +3.3V and capacitor C6, and the other end of capacitor C6 is connected to the ground wire. Pin 15 of chip U2 is connected to one end of resistor R3, one end of capacitor C5, and pin 2 of voltage-regulating triode Q1. The other end of resistor R3 is connected to the power supply +3.3V, the other end of capacitor C5 is connected to the ground wire. The model of voltage-regulating triode Q1 is SML4728A. Pins 1 and 3 of voltage-regulating triode Q1 are connected to the ground wire. Pins 11 and 14 of chip U2 are connected to the ground wire.

[0029] 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.

[0030] Module U4 detects the AC current in the cable between the output contact and the secondary terminal, then converts it into a DC signal, and inputs it through pins 7, 8, and 9 of chip U2. It is converted into a digital signal in chip U2, and then input into 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, that is, when a certain winding in the transformer is open-circuited, chip U3 connected to the lowermost input contact and the output contact in this winding conducts. At this time, the number of turns of the working coils in the primary winding and the secondary winding working in the transformer is the least. Since the relative input contact and the output contact are controlled by the same chip U3 and conduct and turn off simultaneously, at this moment, the number of turns of the coil in the primary winding of the same winding is N1, and the number of turns of the coil in the secondary winding is N2. Since the input contact divides the number of turns of the coil in the primary winding equally, and the output contact divides the number of turns of the coil in the secondary winding equally, the ratio of the corresponding N1 to N2 is a fixed value. When the input voltage U1 of the transformer is certain, according to the formula U1 / U2 = N1 / N2, the output voltage U2 of the transformer is also certain. That is, without changing the output voltage of the transformer, when the output end is open-circuited, the number of working turns in the transformer decreases, reducing the working energy consumption of the transformer at no load.

[0031] When the chip U3 is turned on, the control power supply +24V is input to pin 2 of the chip U3. The optocoupler chip U5 connected to the chip U3 is turned on, and the output of pin 13 of the chip U1 connected to the optocoupler chip U5 is at a high level. Pins 13 to 34 of the chip U1 are used to turn on and off the solid-state relay in the conversion circuit, indirectly controlling the corresponding input and output contacts in each winding, and the connection and disconnection of the primary winding and the secondary winding surface. Therefore, by turning on and off the corresponding pins between pins 13 and 34 of the chip U1, the number of turns of the primary winding and the secondary winding coils in the transformer winding can be controlled. Then, according to the magnitude of the current at the output end of the transformer, the number of turns of the coils in the transformer is controlled, effectively reducing the self-power consumption of the transformer when it is no-load or lightly loaded.

[0032] As Figure 2 shown, the switch circuit includes a chip U6. The chip U6 is an optocoupler, and the model of the chip U6 is TLP521. Pin 1 of the chip U6 is connected to pin 48 of the chip U1, pin 2 of the chip U6 is connected to the ground wire, pin 3 of the chip U6 is connected to one end of a resistor R2, the other end of the resistor R2 is connected to the power supply +24V, and pin 4 of the chip U6 is connected to the control terminal of the AC contactor KM1. When the output of pin 48 of the chip U1 is at a high level, the chip U6 is turned on, and the control terminal of the AC contactor KM1 is connected to the power supply +24V, and the AC contactor KM1 is attracted, and the primary winding in the transformer winding is energized to work. When the module U4 detects that the alternating current in the cable between the output contact and the secondary terminal exceeds the load capacity of the transformer, the output of pin 48 of U1 is at a low level, the chip U6 is turned off, the control terminal of the AC contactor KM1 is disconnected from the power supply +24V, and the AC contactor KM1 is disconnected, and the primary winding in the transformer winding is de-energized and stops working to prevent the transformer from being overloaded and damaged.

[0033] The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or to limit the invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, and to enable others of ordinary skill in the art to understand the invention and design various embodiments with various modifications suitable for the particular use.

Claims

1. A control system for reducing no-load energy consumption of a transformer, characterized in that: It includes a transformer and a control circuit. The transformer includes a housing (1). Inside the housing (1), there are windings (10). There are three windings (10), which are arranged linearly and evenly. The windings (10) are connected to each other through an iron core inside. The windings (10) include a primary winding (4) and a secondary winding (5). The primary winding (4) and the secondary winding (5) are composed of coils. Input contacts (6) are evenly distributed on the surface of the primary winding (4), and output contacts (7) are evenly distributed on the surface of the secondary winding (5). On the upper surface of the housing (1), a primary terminal (2) and a secondary terminal (3) are fixedly connected. The input contacts (6) are connected to the primary terminal (2) through a cable, and the output contacts (7) are connected to the secondary terminal (3) through a cable.

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

3. The control system for reducing no-load energy consumption of a transformer according to claim 1, characterized in that: The number of input contacts (6) is the same as that of output contacts (7), and they are in one-to-one correspondence. The input contacts (6) divide the number of turns of the coils in the primary winding (4) equally, and the output contacts (7) divide the number of turns of the coils in the secondary winding (5) equally.

4. A control system for reducing no-load energy consumption of a transformer according to claim 1, characterized in that: The control circuit includes a conversion circuit, a switching circuit, and an analog-to-digital circuit. The conversion circuit is located between the input contacts (6) and the primary winding (4). The switching circuit is located on the cable between the input contacts (6) and the primary terminal (2). The analog-to-digital circuit is located on the surface of the cable between the output contacts (7) and the secondary terminal (3).

5. The control system for reducing no-load energy consumption of a transformer according to claim 4, characterized in that: The conversion circuit includes a chip U1. The chip U1 is a single-chip microcomputer, and the model of the chip U1 is STM32WBA52CGU6. The 41st pin of the chip U1 is connected to the 1st pin of a crystal oscillator Y1 and one end of a capacitor C1. The 40th pin of the chip U1 is connected to the 3rd pin of the crystal oscillator Y1 and one end of a capacitor C2. The other ends of the capacitor C1, the capacitor C2, and the 2nd pin of the crystal oscillator Y1 are connected to the ground wire. The 36th pin of the chip U1 is connected to one end of a resistor R1 and one end of a capacitor C3. The other end of the resistor R1 is connected to the power supply +3.3V, and the other end of the capacitor C3 is connected to the ground wire. The 6th and 11th pins of the chip U1 are connected to the power supply +3.3V and one end of a capacitor C4. The other end of the capacitor C4 is connected to the ground wire. The 22nd, 35th, and 43rd pins of the chip U1 are connected to the power supply +3.3V, and the 44th pin of the chip U1 is connected to the ground wire.

6. The control system for reducing no-load energy consumption of a transformer according to claim 5, wherein: The conversion circuit also includes a chip U5. The chip U5 is an optocoupler, and the model of the chip U5 is TLP521. The 1st pin of the chip U5 is connected to the 13th pin of the chip U1. The 2nd pin of the chip U5 is connected to the ground wire. The 3rd pin of the chip U5 is connected to one end of a resistor R4. The other end of the resistor R4 is connected to the power supply +24V. The 4th pin of the chip U5 is connected to the 1st pin of a chip U3. The chip U3 is a solid-state relay, and the model of the chip U3 is SSR-H3200ZF. The 2nd pin of the chip U3 is connected to the ground wire. The 3rd pin of the chip U3 is connected to the surface of the primary winding coil. The 4th pin of the chip U3 is connected to the input contact. The 5th pin of the chip U3 is connected to the surface of the secondary winding coil. The 6th pin of the chip U3 is connected to the output contact.

7. The control system for reducing no-load energy consumption of a transformer according to claim 4, wherein: The analog-digital circuit includes module U4 and chip U2. Module U4 is an AC current transmitter, and its model is AC300-420MA. There is a detection hole in the upper part of module U4, and a cable between the output contact and the secondary terminal passes through the detection hole. Pin 1 of module U4 is connected to the power supply +24V, pins 2 and 4 of module U4 are connected to the ground wire, and pin 3 of module U4 is connected to pin 7 of chip U2.

8. The control system for reducing no-load energy consumption of a transformer according to claim 7, characterized in that: Chip U2 is an analog-digital conversion chip, and its model is TLV1544. Pins 5, 13, 10, and 12 of chip U2 are connected to one end of capacitor C6 and the power supply +3.3V, and the other end of capacitor C6 is connected to the ground wire. Pin 15 of chip U2 is connected to one end of resistor R3, one end of capacitor C5, and pin 2 of voltage-regulating triode Q1. The other end of resistor R3 is connected to the power supply +3.3V, the other end of capacitor C5 is connected to the ground wire. The model of voltage-regulating triode Q1 is SML4728A. Pins 1 and 3 of voltage-regulating triode Q1 are connected to the ground wire, and pins 11 and 14 of chip U2 are connected to the ground wire.

9. A control system for reducing no-load energy consumption of a transformer according to claim 8, characterized in that: 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.

10. A control system for reducing no-load energy consumption of a transformer according to claim 4, characterized in that: The switch circuit includes chip U6. Chip U6 is an optocoupler, and its model is TLP521. Pin 1 of chip U6 is connected to pin 48 of chip U1, pin 2 of chip U6 is connected to the ground wire, pin 3 of chip U6 is connected to one end of resistor R2, the other end of resistor R2 is connected to the power supply +24V, and pin 4 of chip U6 is connected to the control terminal of AC contactor KM1.

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