Switchable circuit from transformer to incoming line connecting bar

Abstract

The utility model relates to the technical field of transformers, in particular to a switchable circuit from a transformer to an incoming line connecting bar, which comprises a main power supply module, a main transformation module, an auxiliary power supply module, an auxiliary transformation module, a switchable switch, the incoming line connecting bar and a control module. The switchable switch is a double-pole double-throw switch, two movable ends of the switchable switch are respectively connected with the main transformation module and the auxiliary transformation module, a fixed end of the switchable switch is connected with the incoming line connecting bar, and the control module is used for switching the switchable switch. According to the utility model, through cooperation of the current transformer, the filtering unit, the amplification unit, the comparison unit and the control unit in the control module, problems of the main power supply module can be rapidly detected, when the main power supply module goes wrong, the control module timely switches to the auxiliary power supply module for power supply, power supply stability is maintained, and practicality is stronger.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to a switchable circuit from a transformer to an incoming line connection bar. Background Art

[0002] In modern industrial production and social life, a stable supply of electricity is crucial to various equipment and systems; however, due to various reasons, such as equipment failure, natural disasters, power grid fluctuations, etc., the main power supply may become unstable, resulting in a decline in power supply quality or even interruption; in order to ensure the continuous and stable operation of key equipment and systems, timely switching to a reliable secondary power supply has become an urgent problem to be solved.

[0003] In traditional power systems, the circuit design from the transformer to the incoming line connection bar often adopts a fixed connection method, and the switching between the main and auxiliary power sources relies on manual operation or a simple mechanical interlocking device. This method has obvious shortcomings: first, manual operation has a slow response speed and cannot respond to power fluctuations in a timely manner; second, although the mechanical interlocking device can achieve automatic switching, it often makes the switching unreliable due to mechanical wear, contact aging and other reasons.

[0004] To address these problems, a switchable circuit from the transformer to the incoming line connection bar is required, which can quickly cut off the connection with the main power supply and automatically switch to the auxiliary power supply when the main power supply fails. Utility Model Content

[0005] The purpose of the utility model is to provide a switchable circuit from a transformer to an incoming line connection bar to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The switchable circuit from the transformer to the incoming line connection bar comprises a main power supply module, a main transformer module, an auxiliary power supply module, an auxiliary transformer module, a switchable switch, an incoming line connection bar and a control module, wherein the main power supply module is connected to the main transformer module, the auxiliary power supply module is connected to the auxiliary transformer module, the switchable switch is a double-pole double-throw switch, the two movable ends of the switchable switch are respectively connected to the main transformer module and the auxiliary transformer module, the fixed end of the switchable switch is connected to the incoming line connection bar, and the control module is used to switch the switchable switch.

[0008] Preferably, the control module includes a current transformer, a filtering unit, an amplifying unit, a comparing unit and a control unit connected in sequence, the current transformer is used to detect whether the output current of the main transformer module is normal, the filtering unit is used to filter out interference signals, the amplifying unit is used to amplify the detected signal, the comparing unit is used to determine whether the current is within a normal range, and the control unit is used to control the switching of the switchable switch.

[0009] Preferably, the filtering unit comprises a first resistor R1, a first capacitor C1, a second resistor R2 and a second capacitor C2;

[0010] The first end of the first capacitor C1 is connected to the current transformer, the second end of the first capacitor C1 is connected to the first end of the first resistor R1, the second end of the first resistor R1 is grounded, the first end of the second resistor R2 is connected to the first end of the first resistor R1, the second end of the second resistor R2 is connected to the first end of the second capacitor C2, and the second end of the second capacitor C2 is grounded.

[0011] Preferably, the amplification unit includes a third resistor R3, a first operational amplifier U1, a second operational amplifier U2, a fourth resistor R4 and a fifth resistor R5;

[0012] A first end of the third resistor R3 is connected to the first end of the second capacitor C2, a second end of the third resistor R3 is connected to the non-inverting input end of the first operational amplifier U1, an inverting input end of the first operational amplifier U1 is connected to the output end of the first operational amplifier U1, a non-inverting input end of the second operational amplifier U2 is connected to the output end of the first operational amplifier U1, a first end of the fourth resistor R4 is connected to the inverting input end of the second operational amplifier U2, a second end of the fourth resistor R4 is grounded, a first end of the fifth resistor R5 is connected to the first end of the fourth resistor R4, and a second end of the fifth resistor R5 is connected to the output end of the second operational amplifier U2.

[0013] Preferably, the comparison unit includes a power supply VCC, a sixth resistor R6, a seventh resistor R7, a third operational amplifier U3, a first diode D1, an eighth resistor R8, a ninth resistor R9, a fourth operational amplifier U4 and a second diode D2;

[0014] The power supply VCC is provided by the auxiliary transformer module, the first end of the sixth resistor R6 is connected to the power supply VCC, the second end of the sixth resistor R6 is connected to the first end of the seventh resistor R7, the second end of the seventh resistor R7 is grounded, the inverting input end of the third operational amplifier U3 is connected to the second end of the sixth resistor R6, the non-inverting input end of the third operational amplifier U3 is connected to the output end of the second operational amplifier U2, and the anode of the first diode D1 is connected to the output end of the third operational amplifier U3;

[0015] A first end of the eighth resistor R8 is connected to the power supply VCC, a second end of the eighth resistor R8 is connected to a first end of the ninth resistor R9, a second end of the ninth resistor R9 is grounded, a common-phase input end of the fourth operational amplifier U4 is connected to the second end of the eighth resistor R8, an inverting input end of the fourth operational amplifier U4 is connected to the output end of the second operational amplifier U2, a positive electrode of the second diode D2 is connected to the output end of the fourth operational amplifier U4, and a negative electrode of the second diode D2 is connected to a negative electrode of the first diode D1.

[0016] Preferably, the control unit comprises a tenth resistor R10, an eleventh resistor R11, a transistor and a relay KA;

[0017] The first end of the tenth resistor R10 is connected to the cathode of the second diode D2, the second end of the tenth resistor R10 is connected to the base of the transistor, the first end of the eleventh resistor R11 is connected to the power supply VCC, the second end of the eleventh resistor R11 is connected to the second end of the tenth resistor R10, the emitter of the transistor is connected to the power supply VCC, the collector of the transistor is connected to the first end of the relay KA, the second end of the relay KA is grounded, and the relay KA is used to switch the switchable switch.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The utility model sets a main power supply module and a secondary power supply module, and through the cooperation of the current transformer, the filtering unit, the amplifying unit, the comparing unit and the control unit in the control module, the problem of the main power supply module can be quickly detected. When the main power supply module has a problem, the control module promptly switches the power supply to the secondary power supply module to maintain the stability of the power supply, which is more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 It is a connection diagram of the control module in the utility model;

[0022] Figure 3 It is the circuit diagram of the control module in the utility model.

[0023] In the figure:

[0024] 1. Main power supply module;

[0025] 2. Main transformer module;

[0026] 3. Auxiliary power supply module;

[0027] 4. Auxiliary transformer module;

[0028] 5. Switchable switch;

[0029] 6. Incoming line connection row;

[0030] 7. Control module; 70. Current transformer; 71. Filter unit; 72. Amplification unit; 73. Comparison unit; 74. Control unit. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution in the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] See also Figure 1-Figure 3 , the utility model provides a technical solution:

[0033] The switchable circuit from the transformer to the incoming line connection row includes a main power supply module 1, a main transformer module 2, an auxiliary power supply module 3, an auxiliary transformer module 4, a switchable switch 5, an incoming line connection row 6 and a control module 7. The main power supply module 1 is connected to the main transformer module 2, the auxiliary power supply module 3 is connected to the auxiliary transformer module 4, the switchable switch 5 is a double-pole double-throw switch, the two movable ends of the switchable switch 5 are respectively connected to the main transformer module 2 and the auxiliary transformer module 4, the fixed end of the switchable switch 5 is connected to the incoming line connection row 6, and the control module 7 is used to switch the switchable switch 5. When a problem is detected in the main power supply module 1, it is switched to the auxiliary power supply module 3 in time to ensure the stability of power supply.

[0034] In this embodiment, the control module 7 includes a current transformer 70, a filtering unit 71, an amplifying unit 72, a comparing unit 73 and a control unit 74 connected in sequence. The current transformer 70 is used to detect whether the output current of the main transformer module 2 is normal, the filtering unit 71 is used to filter out interference signals, the amplifying unit 72 is used to amplify the detected signal, the comparing unit 73 is used to determine whether the current is within a normal range, and the control unit 74 is used to control the switching of the switchable switch 5. The current transformer 70 can detect the current output by the main power supply module 1, and then determine whether it is necessary to switch to the auxiliary power supply module 3.

[0035] Specifically, the filtering unit 71 includes a first resistor R1, a first capacitor C1, a second resistor R2 and a second capacitor C2;

[0036] A first end of the first capacitor C1 is connected to the current transformer 70, a second end of the first capacitor C1 is connected to a first end of the first resistor R1, a second end of the first resistor R1 is grounded, a first end of the second resistor R2 is connected to a first end of the first resistor R1, a second end of the second resistor R2 is connected to a first end of the second capacitor C2, a second end of the second capacitor C2 is grounded, the first resistor R1 and the first capacitor C1 form a high-pass filter, the second resistor R2 and the second capacitor C2 form a low-pass filter, and the filtering unit 71 as a whole is a band-pass filter, which can remove interfering noise.

[0037] Further, the amplification unit 72 includes a third resistor R3, a first operational amplifier U1, a second operational amplifier U2, a fourth resistor R4 and a fifth resistor R5;

[0038] A first end of the third resistor R3 is connected to a first end of the second capacitor C2, a second end of the third resistor R3 is connected to a non-inverting input end of the first operational amplifier U1, an inverting input end of the first operational amplifier U1 is connected to an output end of the first operational amplifier U1, a non-inverting input end of the second operational amplifier U2 is connected to an output end of the first operational amplifier U1, a first end of the fourth resistor R4 is connected to an inverting input end of the second operational amplifier U2, a second end of the fourth resistor R4 is grounded, a first end of the fifth resistor R5 is connected to a first end of the fourth resistor R4, a second end of the fifth resistor R5 is connected to an output end of the second operational amplifier U2, the first operational amplifier U1 is a voltage follower, used to isolate the front and rear stage circuits, and the second operational amplifier U2 is used to amplify the detected current signal.

[0039] It is worth noting that the comparison unit 73 includes a power supply VCC, a sixth resistor R6, a seventh resistor R7, a third operational amplifier U3, a first diode D1, an eighth resistor R8, a ninth resistor R9, a fourth operational amplifier U4 and a second diode D2;

[0040] The power supply VCC is provided by the auxiliary transformer module 4, the first end of the sixth resistor R6 is connected to the power supply VCC, the second end of the sixth resistor R6 is connected to the first end of the seventh resistor R7, the second end of the seventh resistor R7 is grounded, the inverting input end of the third operational amplifier U3 is connected to the second end of the sixth resistor R6, the non-inverting input end of the third operational amplifier U3 is connected to the output end of the second operational amplifier U2, and the anode of the first diode D1 is connected to the output end of the third operational amplifier U3;

[0041] The first end of the eighth resistor R8 is connected to the power supply VCC, the second end of the eighth resistor R8 is connected to the first end of the ninth resistor R9, the second end of the ninth resistor R9 is grounded, the in-phase input end of the fourth operational amplifier U4 is connected to the second end of the eighth resistor R8, the inverting input end of the fourth operational amplifier U4 is connected to the output end of the second operational amplifier U2, the anode of the second diode D2 is connected to the output end of the fourth operational amplifier U4, the cathode of the second diode D2 is connected to the cathode of the first diode D1, the third operational amplifier U3 and the fourth operational amplifier U4 constitute a window comparator. When the output voltage of the second operational amplifier U2 is within the voltage range of the window comparator, the window comparator outputs a high level, otherwise it outputs a low level.

[0042] It is worth noting that the control unit 74 includes a tenth resistor R10, an eleventh resistor R11, a transistor and a relay KA;

[0043] The first end of the tenth resistor R10 is connected to the cathode of the second diode D2, the second end of the tenth resistor R10 is connected to the base of the transistor, the first end of the eleventh resistor R11 is connected to the power supply VCC, the second end of the eleventh resistor R11 is connected to the second end of the tenth resistor R10, the emitter of the transistor is connected to the power supply VCC, the collector of the transistor is connected to the first end of the relay KA, the second end of the relay KA is grounded, the relay KA is used to switch the switchable switch 5, the transistor is a PNP transistor, when the window comparator outputs a low level, it means that the current is too high or too low, the transistor is turned on, and the relay KA works.

[0044] When the switchable circuit from the transformer to the incoming line connection row of the utility model is in use, the main power supply module 1 and the auxiliary power supply module 3 are used for common power supply, and the switchable switch 5 controls which power supply module is connected to the incoming line connection row 6. The current transformer 70 detects the voltage output by the main transformer module 2, and inputs the detected signal into the filter unit 71. The filter unit 71 is a bandpass filter that can filter out interference signals. The voltage follower in the amplification unit 72 can isolate the front and rear stage circuits, and then amplify the detection signal, and then pass through the comparison unit 73. The comparison unit 73 is a window comparator. When the output signal of the amplification unit 72 is within the voltage range of the window comparator, the window comparator outputs a high level, otherwise it outputs a low level. When the comparison unit 73 outputs a low level, it indicates that the detected current is too large or too small. At this time, the transistor in the control unit 74 is turned on, and the relay KA controls the switchable switch 5 to switch, and the auxiliary power supply module 3 supplies power, thereby ensuring the stability of the power supply and being more practical.

[0045] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A switchable circuit from a transformer to an incoming line connection bar, comprising a main power supply module (1), a main transformer module (2), an auxiliary power supply module (3), an auxiliary transformer module (4), a switchable switch (5), an incoming line connection bar (6) and a control module (7), characterized in that: The main power supply module (1) is connected to the main transformer module (2), the auxiliary power supply module (3) is connected to the auxiliary transformer module (4), the switchable switch (5) is a double-pole double-throw switch, the two movable ends of the switchable switch (5) are respectively connected to the main transformer module (2) and the auxiliary transformer module (4), the fixed end of the switchable switch (5) is connected to the incoming line connection bar (6), and the control module (7) is used to switch the switchable switch (5).

2. The switchable circuit from transformer to incoming line connection bar according to claim 1, characterized in that: The control module (7) comprises a current transformer (70), a filter unit (71), an amplifying unit (72), a comparing unit (73) and a control unit (74) which are connected in sequence, wherein the current transformer (70) is used to detect whether the output current of the main transformer module (2) is normal, the filter unit (71) is used to filter out interference signals, the amplifying unit (72) is used to amplify the detected signal, the comparing unit (73) is used to determine whether the current is within a normal range, and the control unit (74) is used to control the switching of the switchable switch (5).

3. The switchable circuit from transformer to incoming line connection bar according to claim 2, characterized in that: The filtering unit (71) comprises a first resistor R1, a first capacitor C1, a second resistor R2 and a second capacitor C2; A first end of the first capacitor C1 is connected to the current transformer (70), a second end of the first capacitor C1 is connected to a first end of a first resistor R1, a second end of the first resistor R1 is grounded, a first end of the second resistor R2 is connected to a first end of the first resistor R1, a second end of the second resistor R2 is connected to a first end of the second capacitor C2, and a second end of the second capacitor C2 is grounded.

4. The switchable circuit from transformer to incoming line connection bar according to claim 3, characterized in that: The amplification unit (72) comprises a third resistor R3, a first operational amplifier U1, a second operational amplifier U2, a fourth resistor R4 and a fifth resistor R5; A first end of the third resistor R3 is connected to the first end of the second capacitor C2, a second end of the third resistor R3 is connected to the non-inverting input end of the first operational amplifier U1, an inverting input end of the first operational amplifier U1 is connected to the output end of the first operational amplifier U1, a non-inverting input end of the second operational amplifier U2 is connected to the output end of the first operational amplifier U1, a first end of the fourth resistor R4 is connected to the inverting input end of the second operational amplifier U2, a second end of the fourth resistor R4 is grounded, a first end of the fifth resistor R5 is connected to the first end of the fourth resistor R4, and a second end of the fifth resistor R5 is connected to the output end of the second operational amplifier U2.

5. The switchable circuit from transformer to incoming line connection bar according to claim 4, characterized in that: The comparison unit (73) comprises a power supply VCC, a sixth resistor R6, a seventh resistor R7, a third operational amplifier U3, a first diode D1, an eighth resistor R8, a ninth resistor R9, a fourth operational amplifier U4 and a second diode D2; A power source VCC is provided by the auxiliary transformer module (4); a first end of a sixth resistor R6 is connected to the power source VCC; a second end of the sixth resistor R6 is connected to a first end of a seventh resistor R7; a second end of the seventh resistor R7 is grounded; an inverting input end of a third operational amplifier U3 is connected to a second end of the sixth resistor R6; a non-inverting input end of the third operational amplifier U3 is connected to an output end of the second operational amplifier U2; and a positive electrode of a first diode D1 is connected to an output end of the third operational amplifier U3; A first end of the eighth resistor R8 is connected to the power supply VCC, a second end of the eighth resistor R8 is connected to a first end of the ninth resistor R9, a second end of the ninth resistor R9 is grounded, a common-phase input end of the fourth operational amplifier U4 is connected to the second end of the eighth resistor R8, an inverting input end of the fourth operational amplifier U4 is connected to the output end of the second operational amplifier U2, a positive electrode of the second diode D2 is connected to the output end of the fourth operational amplifier U4, and a negative electrode of the second diode D2 is connected to a negative electrode of the first diode D1.

6. The switchable circuit from transformer to incoming line connection bar according to claim 5, characterized in that: The control unit (74) comprises a tenth resistor R10, an eleventh resistor R11, a transistor and a relay KA; The first end of the tenth resistor R10 is connected to the cathode of the second diode D2, the second end of the tenth resistor R10 is connected to the base of the transistor, the first end of the eleventh resistor R11 is connected to the power supply VCC, the second end of the eleventh resistor R11 is connected to the second end of the tenth resistor R10, the emitter of the transistor is connected to the power supply VCC, the collector of the transistor is connected to the first end of the relay KA, the second end of the relay KA is grounded, and the relay KA is used to switch the switchable switch (5).

Images