Control device of isolation transformation module and electric control system

Abstract

The invention discloses a control device of an isolation voltage transformation module and an electric control system, and relates to the technical field of power supply isolation, the control device comprises a protection switch unit, a change-over switch unit and a control module, an input stage of the isolation voltage transformation module is connected with the protection switch unit, and an output stage of the isolation voltage transformation module is connected with the change-over switch unit. The control module is connected with the change-over switch unit and the protection switch unit; and the control module is used for controlling the switching switch unit to be switched on under the condition that the protection switch unit is switched on. The technical problem of unstable operation of the electric control system caused by unnecessary disconnection of the protection switch is solved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of power isolation technology, and in particular to a control device for an isolation transformer module. Background Art

[0002] With the development of electronic control technology, isolation transformers are increasingly used in electronic control systems. The primary winding of the isolation transformer is usually equipped with a protection switch and directly connected to the mains. This design is designed to ensure that when an abnormality occurs in the circuit, the protection switch can respond quickly and cut off the power supply, thereby effectively preventing the load connected to the output stage of the isolation transformer from being damaged.

[0003] However, in actual use, in order to control whether the load is connected to the mains, a switch is set at the input stage of the isolation transformer. When the switch is closed and the load is connected to the mains, the automatic disconnection mechanism of the protection switch is easily triggered due to transient changes in current or voltage. This unnecessary protection switch action causes the load to be unable to be connected to the mains in a timely and stable manner, affecting the normal operation and stability of the electric control system where the isolation transformer is located.

[0004] The above contents are only used to assist in understanding the technical solutions of the embodiments of the present application, and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The main purpose of the present application is to provide a control device and an electric control system for an isolation transformer module, aiming to solve the technical problem of unstable operation of the electric control system caused by unnecessary disconnection of the protection switch.

[0006] To achieve the above-mentioned object, the present application provides a control device for an isolation transformer module, the control device comprising a protection switch unit, a switching switch unit and a control module, the input stage of the isolation transformer module is connected to the protection switch unit, the output stage of the isolation transformer module is connected to the switching switch unit, and the control module is connected to the switching switch unit and the protection switch unit;

[0007] The control module is used to control the switching switch unit to be turned on when the protection switch unit is turned on.

[0008] In one embodiment, the control module includes a control protection switch, a first setting button and a second setting button;

[0009] The control protection switch is connected to the input stage of the isolation transformer module, and the control protection switch is sequentially connected to the first setting button, the second setting button and the electromagnetic coil of the switching unit, and the second setting button is connected in parallel to the auxiliary contact of the switching unit.

[0010] In one embodiment, when the first setting button and the second setting button are turned on, the electromagnetic coil is energized and the auxiliary contact is closed;

[0011] When the auxiliary contacts are closed and the electromagnetic coil is energized, the main contacts in the diverter switch unit are closed.

[0012] In one embodiment, the control module further includes a control protection switch and a setting button with light, and the setting button with light includes a third setting button, a setting switch, a first indicator light, and a second indicator light;

[0013] The control protection switch is connected to the input stage of the isolation transformer module, the control protection switch is connected to the first end of the setting switch and the first end of the third setting button, the second end of the setting switch is connected to the first end of the first indicator light, the second end of the first indicator light is connected to the first end of the second indicator light, the second end of the second indicator light is connected to the second end of the third setting button, and the third end of the third setting button is connected to the third end of the setting switch;

[0014] The second end of the third setting button is connected to the electromagnetic coil of the switching unit.

[0015] In one embodiment, when the third setting button is turned on, the setting switch is disconnected, the first indicator light is off, the second indicator light is on, the electromagnetic coil is energized, and the main contacts in the switching switch unit are closed.

[0016] In one embodiment, when the third setting button is disconnected, the setting switch is closed, the first indicator light is on, the second indicator light is off, the electromagnetic coil is not energized, and the main contacts of the switching switch unit are disconnected.

[0017] In one embodiment, the isolation transformer module is an isolation transformer, the input stage of the isolation transformer module is the primary winding of the isolation transformer, the output stage of the isolation transformer module is the secondary winding of the isolation transformer, the protection switch unit includes a first protection contact and a second protection contact, and the switching switch unit includes a main contact;

[0018] The first protection contact is connected to a first end of the primary winding of the isolation transformer, the second protection contact is connected to a second end of the primary winding of the isolation transformer, and the secondary winding of the isolation transformer is connected to the main contact.

[0019] In one embodiment, the isolation transformer module is a preset number of isolation transformers, the input stage of the isolation transformer module is the primary winding of the isolation transformer, the output stage of the isolation transformer module is the secondary winding of the isolation transformer, the protection switch unit includes a preset number of protection contacts, and the switching switch unit includes a preset number of main contacts;

[0020] The primary winding of each isolation transformer is connected to a protection contact, and the secondary winding of each isolation transformer is connected to a switching main contact. The number of isolation transformers connected to the protection contact is 1, and the number of isolation transformers connected to the main contact is 1.

[0021] In one embodiment, the control device further includes a load module and a power module, the power module is connected to the protection switch unit, and the load module is connected to the switching switch unit.

[0022] In addition, to achieve the above-mentioned purpose, the present application also provides an electric control system, which includes a control device for the isolation transformer module as described above.

[0023] One or more technical solutions proposed in the present application have at least the following technical effects: in the present embodiment, since the switching switch unit is connected to the output stage of the isolation transformer module, and the protection switch unit is arranged at the input stage of the isolation transformer module, the control module is used to control the switching switch unit to be turned on when the protection switch unit is turned on. When the protection switch unit is turned on, the isolation transformer module can establish a connection with the power supply through the turned-on protection switch unit, and the isolation transformer module can establish a corresponding magnetic field. Since the protection switch unit is turned on before the switching switch unit is turned on, the isolation transformer module has established a corresponding magnetic field. Therefore, when the switching switch unit is turned on, the isolation transformer unit will not have an instantaneous large current, thereby avoiding the protection switch unit from being powered off when the switching switch unit is closed. Therefore, the present embodiment can avoid the situation where the protection switch unit is unnecessary powered off, thereby improving the connection stability of the electric control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the embodiments of the present application, and together with the description are used to explain the principles of the embodiments of the present application.

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0026] Figure 1A circuit diagram of an example of a control device for an isolating transformer module of the invention;

[0027] Figure 2 A circuit connection diagram of an embodiment of a control device for an isolation transformer module of the invention;

[0028] Figure 3 A circuit connection diagram of another embodiment of the control device for the isolation transformer module of the invention;

[0029] Figure 4 A circuit connection diagram of an embodiment of a control module in a control device for an isolation transformer module of the invention;

[0030] Figure 5 A circuit connection diagram of another embodiment of a control module in a control device for an isolation transformer module of the invention;

[0031] Figure 6 A circuit connection diagram when the isolation transformer module is an isolation transformer in the control device of the isolation transformer module, and the control module includes a control protection switch, a first setting button and a second setting button;

[0032] Figure 7 The control device for the invented isolation transformer module shows a circuit connection diagram in which the isolation transformer module includes two isolation transformers and the control module includes a control protection switch and a lighted setting switch.

[0033] The purpose, features and advantages of the embodiments of the present application will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

[0034] Description of Figure Numbers:

[0035] u1, the voltage of the primary winding of the isolation transformer; u2, the voltage of the secondary winding of the isolation transformer; e1, the electromotive force of the primary winding of the isolation transformer; e2, the electromotive force of the secondary winding of the isolation transformer; Ф, the main magnetic flux of the isolation transformer; 100, the control module; 200, the protection switch unit; 300, the isolation transformer module; 400 the switching switch unit; 500, the load module; 600, the power module; FU, the control protection switch; SB1, the first setting button; SB2, the second setting button; SB3, the third setting button; KMx, the switching switch unit Electromagnetic coil of element; K1, setting switch; L1, first indicator light; L2, second indicator light; EMF1, first bidirectional thyristor; EMF2, second bidirectional thyristor; QF1-1, first protection contact; QF1-2, second protection contact; QF1, circuit breaker; KM1-1, auxiliary contact; KM1-2, first main contact; KM1-3, second main contact; 310, primary winding; 320, secondary winding; T, iron core; 310a, a_primary winding; 320a, a_secondary winding; Ta, a_iron core; 110, illuminated setting button. DETAILED DESCRIPTION

[0036] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the embodiments of the present application and are not used to limit the embodiments of the present application.

[0037] In order to better understand the technical solutions of the embodiments of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0038] With the development of electronic control technology, isolation transformers are increasingly used in electronic control systems. The input stage of the isolation transformer is usually equipped with a protection switch and directly connected to the mains. This design is designed to ensure that when an abnormality occurs in the circuit, the protection switch can respond quickly and cut off the power supply, thereby effectively preventing the load connected to the output stage of the isolation transformer from being damaged.

[0039] However, in actual use, in order to control whether the load is connected to the mains, a switch is also set at the input stage of the isolation transformer. When the switch is closed and the load is connected to the mains, the automatic disconnection mechanism of the protection switch is easily triggered due to transient changes in current or voltage. This unnecessary protection switch action causes the load to be unable to be connected to the mains in a timely and stable manner, affecting the normal operation and stability of the electronic control system.

[0040] Therefore, this embodiment can ensure that the load is connected to the mains in a timely and stable manner by setting the switching unit at the output end of the isolation transformer module. For a better understanding of this embodiment, taking the isolation transformer module as an isolation transformer as an example, the following explains why the stability of the electric control system where the isolation transformer is located can be improved when the switching unit is set at the output stage of the isolation transformer:

[0041] You can refer to Figure 1 , Figure 1 The current i in the primary winding of the isolation transformer is shown 1 The direction of the primary winding voltage u1 and the primary winding electromotive force e1, as well as the isolation transformer secondary winding electromotive force e2 and current i 2 direction, and the direction of the isolation transformer's main magnetic flux Φ, assuming that the number of turns of the isolation transformer's primary winding is N1, the corresponding resistance of the primary winding is R1, and the leakage magnetic flux is Φσ. When the isolation transformer is running at no load (no load: the isolation transformer is not connected to a load), there is only the electromagnetic relationship of the isolation transformer input stage. Therefore, according to KVL (Kirchhoff's Voltage Law), the voltage corresponding to the primary winding can be expressed as:

[0042] u1=(R1+jXσ)i 1 +(-e1)(Formula 1)

[0043] Among them, u1 is the voltage of the primary winding, e1 is the electromotive force corresponding to the primary winding, j is an imaginary number, Xσ is the leakage reactance corresponding to the primary winding, i 1 is the primary current corresponding to the primary winding. When the power module is AC mains, the magnetic flux required by the AC mains is Фmsinωt, so the main magnetic flux Ф corresponding to the isolation transformer should be Фmsinωt. According to Faraday's law of electromagnetic induction, the electromotive force e1 can be expressed as e1 = -N1dФ / dt. Replacing Ф with Фmsinωt, the electromotive force e can be expressed as:

[0044] e1=-N1dФ / dt=-N1d(Фm sinωt) / dt=-N1ωФmcosωt=2лfN1Фmsin(ωt-90°)

[0045] (Formula 2)

[0046] Among them, N1 is the number of turns of the primary winding, ω is the angular frequency of the AC mains, angular frequency ω = 2лf, f is the frequency, Фm is the amplitude of the maximum main magnetic flux, and formula 2 expresses that the direction of the electromotive force e1 always tries to offset the change of the magnetic flux generated by the primary winding. Isolation transformers usually use iron core materials with high magnetic permeability, which makes most of the magnetic flux concentrated in the core rather than around the winding. Therefore, the leakage flux of the isolation transformer is relatively small, and the effect on the main magnetic flux can be ignored. The coil of the transformer is usually made of wire with low resistance. Under no-load conditions, the voltage drop caused by the coil resistance R1 of the primary winding is relatively small, and has little effect on the total voltage. When calculating the effective value of the transformer primary winding voltage, the focus is on the voltage amplitude, not the voltage phase. Therefore, when calculating the effective value of the primary winding voltage, the influence of the coil resistance and leakage flux of the primary winding on the voltage amplitude can be ignored. The relationship between the effective value of the voltage and the peak value of the voltage is: Therefore, the effective value of the voltage of the primary winding is U1=2лfN1Фm / ≈4.44fN1Фm. Therefore, when no-load, the effective value of the voltage of the primary winding is 4.44fN1Фm.

[0047] When the isolation transformer is connected to a load, under the action of the electromotive force e2, the output stage of the isolation transformer has an induced current i2, and the induced current i2 will also have an effect on the transformer magnetic circuit, so the secondary winding will also generate a magnetic motive force. The magnetic motive force when the isolation transformer is running under load is i 1 N1+i 2 N2,i 1 is the current of the primary winding when the isolation transformer is loaded, i 2 is the current of the secondary winding when the isolation transformer is loaded; when the isolation transformer is unloaded, the magnetomotive force can be i 10 N1,i 10 is the current generated by the primary winding of the isolation transformer when it is unloaded; for the isolation transformer, the total amount of magnetomotive force corresponding to the unloaded and loaded state of the isolation transformer must remain unchanged, i 1 N1+i 2 N2=i 10 N1, which conforms to the KVL (Kirchhoff's voltage law) relationship. Therefore, when the isolation transformer is connected to a load, the effective value of the voltage of the primary winding is still U1 = 2лfN1Фm / ≈4.44fN1Фm, which is equal to the effective value of the voltage of the primary winding when the isolation transformer is unloaded.

[0048] Therefore, for the isolation transformer, the ratio of the voltage at the input stage to the voltage at the output stage in the isolation transformer is equal to the ratio of the number of coil turns of the primary winding to the number of coil turns of the secondary winding, that is, U1 / U2=N1 / N2. When N1=N2, U1=U2, indicating that the voltage values ​​of the input and output stages of the isolation transformer remain unchanged.

[0049] Because I 1 N1+i 2 N2=i 10 N1, so when the isolation transformer is connected to the load, the current of the primary winding will need to continue to provide the main magnetic motive force and compensate for the magnetic motive force generated by the secondary winding. When the isolation transformer is powered on without load, the current of the primary winding only needs to provide the main magnetic motive force, so the current of the isolation transformer when powered on without load is much smaller than the current of the isolation transformer when powered on with load.

[0050] Because the current of the isolation transformer is small when it is unloaded, for example, it is generally 2% to 10% of the current when it is loaded, so i 1 N1+i 2 N2 is approximately 0, so there exists i 1 N1≈-i 2 N2, which means that the magnetomotive force of the primary winding and the magnetomotive force of the secondary winding are nearly opposite in phase, so the secondary winding has a demagnetizing effect on the primary winding, and thus the isolation transformer can operate continuously without magnetic saturation. 1 N1≈-i2N2, so there can be i 1 / i 2 =N2 / N1, when N1=N2, then i 1 =i 2 , indicating that the current value of the primary winding can be equal to the current value of the secondary winding when the isolation transformer is loaded. In other words, when the isolation transformer is running under load, the current value of the primary winding can be equal to the current value of the secondary winding, and the current value can remain unchanged.

[0051] The instantaneous current value impact when the isolation transformer is powered on with load is greater than the current value when it is powered on without load. The instantaneous current value when powered on with load may reach 20 times the no-load current value. The instantaneous current value when powered on with load is too large, which is easy to cause the circuit breaker connected to the primary winding of the isolation transformer to trip, that is, the circuit breaker is disconnected, and then the circuit where the isolation transformer is located is unstable. The instantaneous current value when the isolation transformer is powered on without load can generally be less than or equal to the instantaneous peak value of the circuit breaker, and then when the isolation transformer is powered on without load, the circuit breaker will not trip due to the no-load power-on of the isolation transformer, thereby improving the stability of the circuit. Therefore, in this embodiment, the switching switch unit is set at the output stage of the isolation transformer, that is, the switching switch unit is set between the secondary winding of the isolation transformer and the load, so that after the isolation transformer is running without load, the load can be controlled to be connected to the isolation transformer by the switching switch unit, avoiding instantaneous large current, thereby improving the operation stability of the circuit where the isolation transformer is located.

[0052] Based on this, refer to Figure 2 This embodiment provides a control device for an isolation transformer module, referring to Figure 2 , Figure 2 This is a connection diagram of a control device for an isolation transformer module according to an embodiment of the present application.

[0053] The control device includes a protection switch unit 200, a switching switch unit 400 and a control module 100, the input stage of the isolation transformer module 300 is connected to the protection switch unit 200, the output stage of the isolation transformer module 300 is connected to the switching switch unit 400, and the control module 100 is connected to the switching switch unit 400 and the protection switch unit 200;

[0054] The control module 100 is used to control the switching unit 400 to be turned on when the protection switch unit 200 is turned on.

[0055] It should be noted that the protection switch unit 200 may be a circuit breaker QF1, and the protection switch unit 200 is used to protect the safety of the circuit where the isolation transformer module 300 is located. The isolation transformer module 300 may be an isolation transformer, which may be one isolation transformer or multiple isolation transformers.

[0056] The switching unit 400 may be an AC contactor, and the switching unit 400 is used to control the on-off between the isolation transformer module 300 and the load module 500. When the switching unit 400 is turned on, the load module 500 is connected to the isolation transformer module 300, and when the switching unit 400 is turned off, the load module 500 is disconnected from the isolation transformer module 300. The AC contactor includes a main contact, an auxiliary contact KM1-1 and an electromagnetic coil KMx, and the output stage of the isolation transformer module 300 is connected to the main contact.

[0057] For example, the model of the AC contactor can be LC1D25BDC, the manufacturer can be Schneider, the specification is 3P poles 3NO main contacts, the rated working current is 25A@≦440VAC&≦60℃, and the electrical life can be @≦440VAC&25A. Among them, the specification of 3P poles 3NO main contacts indicates that the AC contactor has three levels (3P), each level can have a normally open main contact, that is, 3 NO main contacts, and the normally open means that if the main contact does not receive a closed signal, the main contact is in an open state. Rated working current 25A@≦440VAC&≦60℃: indicates that the AC contactor can safely carry a maximum current of 25 amperes under the conditions of an AC voltage not exceeding 440 volts (VAC) and an ambient temperature not exceeding 60 degrees Celsius. Electrical life @≦440VAC&25A: indicates the electrical life under the conditions of a voltage not exceeding 440VAC and a current not exceeding 25A.

[0058] The model of the circuit breaker QF1QF may be A9P08620, the manufacturer may be Schneider, the specification may be single-phase power distribution 1P+N, the rated voltage may be 230VAC 50 / 60Hz, and the rated current may be 20A@30℃.

[0059] In this embodiment, the power module 600 can be connected to the input stage of the isolation transformer module 300 through the protection switch unit 200. When the protection switch unit 200 is turned on, the power module 600 is connected to the input stage of the isolation transformer module 300, so that the input stage of the isolation transformer module 300 can be connected to the power module 600, and a corresponding magnetic field can be established. When the protection switch is turned on, the switching switch unit 400 is controlled to be turned on, which can avoid unnecessary disconnection of the protection switch unit 200. When the protection switch unit 200 is disconnected, the power module 600 is disconnected from the input stage of the isolation transformer module 300.

[0060] In this embodiment, since the switching switch unit is connected to the output stage of the isolation transformer module, and the protection switch unit is arranged at the input stage of the isolation transformer module, the control module is used to control the switching switch unit to be turned on when the protection switch unit is turned on. When the protection switch unit is turned on, the isolation transformer module can establish a connection with the power supply through the turned-on protection switch unit, and the isolation transformer module can establish a corresponding magnetic field. Since the protection switch unit is turned on before the switching switch unit is turned on, the isolation transformer module has established a corresponding magnetic field. Therefore, when the switching switch unit is turned on, the isolation transformer unit will not have an instantaneous large current, thereby avoiding the protection switch unit from being powered off when the switching switch unit is closed. Therefore, this embodiment can avoid the situation where the protection switch unit is unnecessary powered off, thereby improving the connection stability of the electrical control system.

[0061] Further, in a feasible embodiment, referring to Figure 3 The control device further includes a load module 500 and a power module 600 , wherein the power module 600 is connected to the protection switch unit 200 , and the load module 500 is connected to the switching switch unit 400 .

[0062] It should be noted that the power module 600 can be AC ​​mains, which can be single-phase or three-phase. When the AC mains is single-phase, the isolation transformer in the isolation transformer module 300 is single-phase. When the AC is three-phase, the isolation transformer in the isolation transformer module 300 is three-phase. The power module 600 can be connected to the protection switch unit 200, which is connected to the input stage of the isolation transformer module 300. The output stage of the isolation transformer module 300 is connected to the switching switch unit 400. The protection switch unit 200 can protect the safety of the circuit where the isolation transformer is located. The switching switch unit 400 can control whether the load module 500 is connected to the isolation transformer module 300. When the switching switch unit 400 is turned on, the load module 500 is connected to the isolation transformer module 300. When the switching switch unit 400 is turned off, the load module 500 is disconnected from the isolation transformer module 300.

[0063] Further, in a feasible embodiment, referring to Figure 4 , the control module 100 includes a control protection switch FU, a first setting button SB1 and a second setting button SB2;

[0064] The control protection switch FU is connected to the input stage of the isolation transformer module 300 , and is sequentially connected to the first setting button SB1 , the second setting button SB2 and the electromagnetic coil KMx of the switching unit 400 , and the second setting button SB2 is connected in parallel to the auxiliary contact KM1 - 1 of the switching unit 400 .

[0065] It should be noted that the control protection switch FU can be a fuse. When the isolation transformer module 300 is abnormal or the control module 100 is abnormal, the control protection switch FU can be disconnected to protect the circuit safety. The first setting button SB1 is a self-resetting on button, and the second setting button SB2 is a self-resetting off button. When the first setting button SB1 does not receive an external pressing operation, the first setting button SB1 is in an on state. When the first setting button SB1 receives an external pressing operation, the first setting button SB1 is in an off state. When the second setting button SB2 does not receive an external pressing operation, the second setting button SB2 is in an off state. When the second setting button SB2 receives an external pressing operation, the second setting button SB2 is in an on state.

[0066] The control protection switch FU is connected to a first end of the first setting button SB1 , a second end of the first setting button SB1 is connected to a first end of the electromagnetic coil KMx in the switching unit 400 , and a second end of the electromagnetic coil KMx is connected to the input stage of the isolation transformer module 300 .

[0067] The second setting button SB2 is connected in parallel to the auxiliary contact KM1-1 of the switch unit 400, a first end of the auxiliary contact KM1-1 is connected to a first end of the second setting button SB2, and a second end of the auxiliary contact KM1-1 is connected to a second end of the second setting button SB2.

[0068] In a feasible embodiment, when the first setting button SB1 and the second setting button SB2 are turned on, the electromagnetic coil KMx is energized, and the auxiliary contact KM1-1 is closed;

[0069] When the auxiliary contact KM1 - 1 is closed and the electromagnetic coil KMx is energized, the main contacts in the diverter switch unit 400 are closed.

[0070] It should be noted that when the first setting button SB1 does not receive an external pressing operation, the first setting button SB1 is turned on, and when the second setting button SB2 receives an external pressing operation, the second setting button SB2 is turned on. When the first setting button SB1 and the second setting button SB2 are turned on, the electromagnetic coil KMx is energized, and the auxiliary contact KM1-1 is closed, and the auxiliary contact KM1-1 is also turned on. When the auxiliary contact KM1-1 is turned on, the main contact is also turned on, so the output stage of the isolation transformer module 300 can establish a connection with the load module 500 by switching the main contact turned on in the switch unit 400.

[0071] When the isolation transformer module 300 is connected to the load module 500, if it is necessary to disconnect the connection between the isolation transformer module 300 and the load module 500, the first setting button SB1 can be pressed to control the first setting button SB1 to be disconnected, the electromagnetic coil KMx loses power, the auxiliary contact KM1-1 and the main contact are disconnected, and the isolation transformer module 300 is disconnected from the load module 500. When the first setting button SB1 is reset, the first setting button SB1 is turned on, but the second setting button SB2 is turned on only when a pressing operation is received, and is reset to a disconnected state when no pressing operation is received. Therefore, even if the first setting button SB1 is reset, when the second setting button SB2 is not pressed, the main contact in the switch is still in a disconnected state, thereby preventing the load module 500 from automatically establishing a connection after being disconnected from the isolation transformer module 300, thereby ensuring the reliability of the circuit.

[0072] In another possible embodiment, referring to Figure 5 , the control module 100 further includes a control protection switch FU and a lighted setting button 110, the lighted setting button 110 includes a third setting button SB3, a setting switch K1, a first indicator light L1 and a second indicator light L2;

[0073] The control protection switch FU is connected to the input stage of the isolation transformer module 300, the control protection switch FU is connected to the first end of the setting switch K1 and the first end of the third setting button SB3, the second end of the setting switch K1 is connected to the first end of the first indicator light L1, the second end of the first indicator light L1 is connected to the first end of the second indicator light L2, the second end of the second indicator light L2 is connected to the second end of the third setting button SB3, and the third end of the third setting button SB3 is connected to the third end of the setting switch K1;

[0074] A second end of the third setting button SB3 is connected to the electromagnetic coil KMx of the switch unit 400 .

[0075] It should be noted that the control protection switch FU can be a fuse, and the illuminated setting button 110 includes a third setting button SB3, a setting switch K1, a first indicator light L1 and a second indicator light L2. The first indicator light L1 is used to indicate whether the setting switch K1 is closed, and the second indicator light L2 is used to indicate whether the third setting button SB3 is closed. The first indicator light L1 can be a red indicator light, and the second indicator light L2 can be a green indicator light, so as to more intuitively understand the closure status of the switch or button in the illuminated setting button 110.

[0076] A second end of the third setting button SB3 is connected to a first end of the electromagnetic coil KMx of the switch unit 400 , and a second end of the electromagnetic coil KMx is connected to an input stage of the isolation transformer module 300 .

[0077] The third setting button SB3 will not automatically reset after being set. When the third setting button SB3 is turned on, the third setting button SB3 will be turned off when pressed next time. When the third setting button SB3 is turned off, the third setting button SB3 will be turned on when pressed next time.

[0078] When the third setting button SB3 is disconnected, the setting switch K1 is closed, and the setting switch K1 is in the on state; when the third setting button SB3 is turned on, the setting switch K1 is disconnected, and the setting switch K1 is in the off state. For example, if the initial state of the third setting button SB3 is the off state, then the third setting button SB3 is disconnected when pressed an even number of times, and is turned on when pressed an odd number of times. In this embodiment, the control module 100 may also include a first bidirectional thyristor and a second bidirectional thyristor, the first bidirectional thyristor is arranged between the first indicator light L1 and the isolation transformer module 300, and the second bidirectional thyristor is arranged between the second indicator light L2 and the isolation transformer module 300, that is, the second end of the first indicator light L1 is connected to the first end of the first bidirectional thyristor, the second end of the second indicator light L2 is connected to the first end of the second bidirectional thyristor, and the second end of the first bidirectional thyristor is connected to the second end of the second bidirectional thyristor.

[0079] In a feasible embodiment, when the third setting button SB3 is turned on, the setting switch K1 is disconnected, the first indicator light L1 is in an off state, the second indicator light L2 is in an on state, the electromagnetic coil KMx is energized, and the main contacts in the switching unit 400 are closed.

[0080] Further, in a feasible embodiment, when the third setting button SB3 is disconnected, the setting switch K1 is closed, the first indicator light L1 is in the light-on state, the second indicator light L2 is in the light-off state, the electromagnetic coil KMx is not energized, and the main contacts of the switching switch unit 400 are disconnected.

[0081] It should be noted that when the third setting button SB3 receives an odd number of press operations, the third setting button SB3 is turned on. When the third setting button SB3 is turned on, the setting switch K1 is disconnected, the first indicator light L1 is in the off state, the second indicator light L2 is in the on state, and the electromagnetic coil KMx is energized. Since the electromagnetic coil KMx of the switching switch unit 400 is energized, the main contacts in the switching switch unit 400 can be driven to close, so that the isolation transformer module 300 is connected to the load module 500.

[0082] When the third setting button SB3 receives an even number of pressing operations, the third setting button SB3 is disconnected. When the third setting button SB3 is disconnected, the setting switch K1 is closed, the first indicator light L1 is in the light-on state, the second indicator light L2 is in the light-off state, the electromagnetic coil KMx is not energized, and the main contacts of the switching switch unit 400 are disconnected.

[0083] In this embodiment, by providing the illuminated setting button 110 in the control module 100 , the user can more intuitively understand the connection status between the load module 500 and the isolation transformer module 300 , and the button cost can be reduced.

[0084] In other embodiments, the control module 100 may also be a device such as a control chip, and a control program may be built into the control chip to control the on or off of the main contacts in the switch unit 400 through the control program. This embodiment does not specifically limit this.

[0085] For further information, please refer to Figure 6 , Figure 6, a circuit connection diagram is shown in which the isolation transformer module 300 is an isolation transformer, and the control module 100 includes a control protection switch, a first setting button SB1, and a second setting button SB2. In a feasible embodiment, the isolation transformer module 300 is an isolation transformer, the input stage of the isolation transformer module 300 is a primary winding 310 of the isolation transformer, the output stage of the isolation transformer module 300 is a secondary winding 320 of the isolation transformer, the protection switch unit 200 includes a first protection contact QF1-1 and a second protection contact QF1-2, and the switching switch unit 400 includes a main contact;

[0086] The first protection contact QF1-1 is connected to the first end of the primary winding 310 of the isolation transformer, the second protection contact QF1-2 is connected to the second end of the primary winding 310 of the isolation transformer, and the secondary winding 320 of the isolation transformer is connected to the main contact.

[0087] It should be noted that the input stage of the isolation transformer module 300 is the primary winding 310 of the isolation transformer, and the output stage of the isolation transformer module 300 is the secondary winding 320 of the isolation transformer. When the isolation transformer module 300 is an isolation transformer, the protection switch unit 200 may include a first protection contact QF1-1 and a second protection contact QF1-2. The first protection contact QF1-1 and the second protection contact QF1-2 may belong to the same circuit breaker QF1. The first protection contact QF1-1 is associated with the second protection contact QF1-2, that is, when the first protection contact QF1-1 is disconnected, the second protection contact QF1-2 is also disconnected, and when the first protection contact QF1-1 is turned on, the second protection contact QF1-2 is also turned on, and the first protection contact QF1-1 and the second protection contact QF1-2 are turned on or off at the same time.

[0088] The switching unit 400 includes a main contact. When the isolation transformer module 300 is an isolation transformer, the number of the main contacts of the switching unit 400 can be 2, which can be a first main contact KM1-2 and a second main contact KM1-3. The first end of the secondary winding 320 of the isolation transformer is connected to the first end of the first main contact KM1-2, the second end of the secondary winding 320 of the isolation transformer is connected to the first end of the second main contact KM1-3, and the second end of the first main contact KM1-2 and the second end of the second main contact KM1-3 are both connected to the load module 500. When the control module includes a control protection switch, a first setting button and a second setting button, the auxiliary contacts, the electromagnetic coil and the first main contact and the second main contact arranged between the secondary winding 300 and the load module 500 in the control module belong to the same AC contactor.

[0089] When the isolation transformer module 300 is an isolation transformer, and the control module 100 includes a first setting button SB1, a second setting button SB2, and a button protection switch, the second end of the second setting button SB2 in the control module 100 is connected to the first end of the electromagnetic coil KMx, the second end of the electromagnetic coil KMx is connected to the second end of the primary winding 310 of the isolation transformer, and the first end of the primary winding 310 can be connected to the first end of the control protection switch FU.

[0090] When the isolation transformer module 300 is an isolation transformer, and the control module 100 includes a control protection switch FU and a lighted setting button 110, the second end of the third setting button SB3 in the lighted setting button 110 in the control module 100 is connected to the first end of the electromagnetic coil KMx, the second end of the electromagnetic coil KMx is connected to the second end of the primary winding 310 of the isolation transformer, and the first end of the primary winding 310 can be connected to the first end of the control protection switch FU. When the isolation transformer module 300 is an isolation transformer, the power of the isolation transformer can be 1500W.

[0091] Further, in a feasible embodiment, please refer to Figure 7 , Figure 7 , a circuit connection diagram is shown in which the isolation transformer module 300 includes two isolation transformers, and the control module 100 includes a control protection switch FU and a lighted setting switch K1. The isolation transformer module 300 is a preset number of isolation transformers, the input stage of the isolation transformer module 300 is the primary winding 310 of the isolation transformer, the output stage of the isolation transformer module 300 is the secondary winding 320 of the isolation transformer, the protection switch unit 200 includes a preset number of protection contacts, and the switching switch unit 400 includes a preset number of main contacts;

[0092] Each primary winding 310 of the isolation transformer is connected to a protection contact, and each secondary winding 320 of the isolation transformer is connected to a switching main contact. The number of isolation transformers connected to the protection contact is 1, and the number of isolation transformers connected to the main contact is 1.

[0093] It should be noted that the isolation transformer module 300 may also include a preset number of isolation transformers, which may be set based on actual conditions, for example, 2, or other numbers. When the isolation transformer module 300 includes multiple isolation transformers, the protection switch unit 200 includes a preset number of protection contacts.

[0094] The switch unit 400 includes a preset number of main contacts, each of which is connected to a secondary winding 320 of an isolation transformer, and each main contact is connected to a different isolation transformer.

[0095] When the isolation transformer module 300 is a plurality of isolation transformers, the primary winding connected to the control protection switch FU in the control module 100 and the primary winding connected to the electromagnetic coil KMx are primary windings belonging to the same isolation transformer. For example, the control protection switch can be connected to the first end of the same a_primary winding 310a, and the electromagnetic coil KMx can be connected to the second end of the same a_primary winding 310a.

[0096] Reference Figure 7 The multiple isolation transformers included in the isolation transformer module may be a first isolation transformer and a second isolation transformer. The first isolation transformer may include a primary winding 310, a secondary winding 320 and an iron core T, and the second isolation transformer may include a_primary winding 310a, a_secondary winding 320a and a_iron core Ta.

[0097] The preset number of protection contacts included in the protection switch unit can be the first protection contact and the second protection contact. The secondary winding 310 of the first isolation transformer is connected to the first end of the first protection contact QF1-1 in the protection switch unit 200, and the second end of the first protection contact QF1-1 is connected to the power module 600. The first protection contact QF1-1 is associated with the second protection contact QF1-2, that is, when the first protection contact QF1-1 is disconnected, the second protection contact QF1-2 is also disconnected, and when the first protection contact QF1-1 is turned on, the second protection contact QF1-2 is also turned on, and the first protection contact QF1-1 and the second protection contact QF1-2 are turned on or disconnected at the same time.

[0098] The second end of the first protection contact QF1-1 is connected to the second end of the second protection contact QF1-2, the first end of the second protection contact QF1-2 is connected to the first end of the a_primary winding 310a of the second isolation transformer, and the second end of the a_primary winding 310a is connected to the power module 600. The first end of the control protection switch FU can be connected to the first end of the a_primary winding 310a, and the electromagnetic coil KMx can be connected to the second end of the a_primary winding 310a.

[0099] In this embodiment, when the isolation transformer module 300 is a plurality of isolation transformers, the load modules 500 connected to each isolation transformer may be different, and only one main contact may be provided between the secondary winding 320 of each isolation transformer and the load module 500. Figure 7, the first end of the secondary winding 320 of the first isolation transformer is connected to the first end of the first main contact KM1-2, and the second end of the secondary winding 320 is connected to the load module 500. The first end of the a_secondary winding 320a of the second isolation transformer is connected to the first end of the second main contact KM1-3, and the second end of the a_secondary winding 320a is connected to the load module 500. The first main contact KM1-2 and the second main contact KM1-3 may belong to the same AC contactor. When the electromagnetic coil KMx is energized, the first main contact KM1-2 and the second main contact KM1-3 may be closed at the same time, so that the first isolation transformer is connected to the load module 500, and the second isolation transformer may also be connected to the load module 500. Refer to Figure 7 , the first main contact, the second main contact and the electromagnetic coil can belong to the same AC contactor.

[0100] In this embodiment, no matter whether the load module is in the power-on, power-off or running state, the circuit breaker connected to the isolation transformer of the circuit where the load module is located does not trip automatically under normal circumstances. When the circuit where the isolation transformer is located is abnormal, such as a sudden short circuit of the load, the circuit breaker can trip in time to cut off the power supply, and each component in the circuit is not damaged.

[0101] The present application also provides an electric control system, which includes a control device of the isolation transformer module as described above. The structure of the control device of the isolation transformer module can refer to the above embodiment and will not be described in detail here. As it should be, since the electric control system of this embodiment includes all the technical solutions of all the above embodiments of the electric control system, and the technical effects achieved are also exactly the same, they will not be described in detail here.

[0102] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A control device for an isolation transformer module, characterized in that: The control device comprises a protection switch unit, a switching switch unit and a control module, the input stage of the isolation transformer module is connected to the protection switch unit, the output stage of the isolation transformer module is connected to the switching switch unit, and the control module is connected to the switching switch unit and the protection switch unit; The control module is used to control the switching switch unit to be turned on when the protection switch unit is turned on.

2. The control device for the isolation transformer module according to claim 1, characterized in that: The control module includes a control protection switch, a first setting button and a second setting button; The control protection switch is connected to the input stage of the isolation transformer module, and the control protection switch is sequentially connected to the first setting button, the second setting button and the electromagnetic coil of the switching unit, and the second setting button is connected in parallel to the auxiliary contact of the switching unit.

3. The control device for the isolation transformer module according to claim 2, characterized in that: When the first setting button and the second setting button are turned on, the electromagnetic coil is energized and the auxiliary contact is closed; When the auxiliary contacts are closed and the electromagnetic coil is energized, the main contacts in the diverter switch unit are closed.

4. The control device for the isolation transformer module according to claim 1, characterized in that: The control module further includes a control protection switch and a setting button with light, wherein the setting button with light includes a third setting button, a setting switch, a first indicator light and a second indicator light; The control protection switch is connected to the input stage of the isolation transformer module, the control protection switch is connected to the first end of the setting switch and the first end of the third setting button, the second end of the setting switch is connected to the first end of the first indicator light, the second end of the first indicator light is connected to the first end of the second indicator light, the second end of the second indicator light is connected to the second end of the third setting button, and the third end of the third setting button is connected to the third end of the setting switch; The second end of the third setting button is connected to the electromagnetic coil of the switching unit.

5. The control device for the isolation transformer module according to claim 4, characterized in that: When the third setting button is turned on, the setting switch is disconnected, the first indicator light is off, the second indicator light is on, the electromagnetic coil is energized, and the main contacts in the switching switch unit are closed.

6. The control device for the isolation transformer module according to claim 4, characterized in that: When the third setting button is disconnected, the setting switch is closed, the first indicator light is on, the second indicator light is off, the electromagnetic coil is not energized, and the main contacts of the switching switch unit are disconnected.

7. The control device for the isolation transformer module according to claim 1, characterized in that: The isolation transformer module is an isolation transformer, the input stage of the isolation transformer module is the primary winding of the isolation transformer, the output stage of the isolation transformer module is the secondary winding of the isolation transformer, the protection switch unit includes a first protection contact and a second protection contact, and the switching switch unit includes a main contact; The first protection contact is connected to a first end of the primary winding of the isolation transformer, the second protection contact is connected to a second end of the primary winding of the isolation transformer, and the secondary winding of the isolation transformer is connected to the main contact.

8. The control device for the isolation transformer module according to claim 1, characterized in that: The isolation transformer module is a preset number of isolation transformers, the input stage of the isolation transformer module is the primary winding of the isolation transformer, the output stage of the isolation transformer module is the secondary winding of the isolation transformer, the protection switch unit includes a preset number of protection contacts, and the switching switch unit includes a preset number of main contacts; The primary winding of each isolation transformer is connected to a protection contact, and the secondary winding of each isolation transformer is connected to a switching main contact. The number of isolation transformers connected to the protection contact is 1, and the number of isolation transformers connected to the main contact is 1.

9. The control device for the isolation transformer module according to claim 1, characterized in that: The control device further comprises a load module and a power module, wherein the power module is connected to the protection switch unit, and the load module is connected to the switching switch unit.

10. An electric control system, comprising the control device of the isolation transformer module according to any one of claims 1 to 9.

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