CN218568762U - Three-phase contactless breaker - Google Patents
Three-phase contactless breaker Download PDFInfo
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- CN218568762U CN218568762U CN202222707347.2U CN202222707347U CN218568762U CN 218568762 U CN218568762 U CN 218568762U CN 202222707347 U CN202222707347 U CN 202222707347U CN 218568762 U CN218568762 U CN 218568762U
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Abstract
The application relates to a three-phase contactless circuit breaker, include: the current detection circuit comprises a current transformer, a rectifying element, a first optocoupler element, a control element and a first triode, wherein a primary side of the current transformer is connected with a three-phase power supply, a secondary side of the current transformer is connected with an alternating current end of the rectifying element, the control element is connected with the rectifying element through the first optocoupler element, an output end of the control element is connected with a base electrode of the first triode, a collector electrode of the first triode is connected with a first relay, and an emitting electrode of the first triode is grounded. The input end of the control circuit is connected with the output end of the current detection circuit, the output voltage is led to the input end of the control circuit through the first relay, and the control circuit comprises a plurality of constant current source circuits and an optical coupler output loop. The main switch circuit comprises a plurality of loop thyristors formed by unidirectional thyristors and capacitance elements, and every two groups of loop thyristors are connected with a phase power supply. The three-phase contactless breaker can be timely broken according to the circuit condition, and has high reliability.
Description
Technical Field
The application relates to the technical field of controllers, in particular to a three-phase contactless circuit breaker.
Background
The application types of the controller are various, at present, the technology of realizing the connection and disconnection of a circuit through the controller is mature day by day, and the function of realizing the circuit breaker by using the controller has a better development trend. The circuit breaker is a switching device capable of closing, carrying, and opening/closing a current under a normal circuit condition and a current under an abnormal circuit condition within a prescribed time. The circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to the application range, the high-voltage and low-voltage boundary lines are relatively vague, and the circuit breakers above 3kV are generally called high-voltage electric appliances. The circuit breaker can be used for distributing electric energy, starting an asynchronous motor infrequently, protecting a power supply circuit, the motor and the like, and automatically cutting off a circuit when faults such as serious overload, short circuit, undervoltage and the like occur, and the function of the circuit breaker is equivalent to the combination of a fuse type switch, an over-under-heat relay and the like.
The existing circuit breakers are all provided with contacts which are connected by electricity, magnetism and force, and because of the contacts, the contact points are inevitably abraded. Meanwhile, the vibration can cause the generation of sparks, the interference on the circuit is easy to generate, and when the current is large or the short circuit occurs, the circuit is cut off by using a mechanical structure to be sluggish.
Therefore, when a general circuit breaker is mechanically opened, the circuit breaker cannot be opened in time according to the circuit condition.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a three-phase contactless breaker capable of timely breaking according to the circuit condition.
A three-phase contactless circuit breaker comprising:
the current detection circuit comprises a current transformer, a rectifying element, a first optocoupler element, a control element and a first triode, wherein a primary side of the current transformer is connected with a three-phase power supply, a secondary side of the current transformer is connected with an alternating current end of the rectifying element, the control element is connected with the rectifying element through the first optocoupler element, an output end of the control element is connected with a base electrode of the first triode, a collector electrode of the first triode is connected with a first relay, and an emitting electrode of the first triode is grounded;
the input end of the control circuit is connected with the output end of the current detection circuit, the output voltage is led to the input end of the control circuit through the first relay, and the control circuit comprises a plurality of constant current source circuits and an optocoupler output loop;
the main switch circuit comprises a plurality of loop thyristors formed by unidirectional thyristors and capacitance elements, and each two groups of loop thyristors are connected to a phase power supply;
and part of detection signals of the current detection circuit are transmitted to the control circuit, the control circuit sends signals in a normal range to enable the main switch circuit to work normally, then detection current is obtained from the main switch circuit, and if the detection current is far larger than a first threshold value, signals are sent to the current detection circuit to enable the control circuit to send signals to the main switch circuit to turn off the main switch circuit.
In one embodiment, the current transformer comprises a first current transformer and a second current transformer, the rectifying element comprises a first rectifier and a second rectifier, the control element comprises a second control element and a third control element, the first current transformer and the second current transformer are connected to a three-phase power supply, the alternating current end of the first rectifier is connected to the secondary side of the first current transformer, the secondary side of the second current transformer is connected to the alternating current end of the second rectifier, the output end of the first rectifier is connected in series with a first diode, the output end of the second rectifier is connected in series with a second diode, and the output end branches of the first rectifier and the second rectifier form a closed loop.
In one embodiment, the current detection circuit further comprises a first sampling resistor, the first diode, the second diode and the first sampling resistor form an OR gate circuit, the first sampling resistor is connected with the first optical coupler element, a collector of the first optical coupler element is connected with a reverse input end of the second control element and an input end of the third control element respectively, an emitter of the first optical coupler element is grounded, an output end of the second control element is connected with an input end of the third control element, an output end of the third control element is connected with a first triode, a collector of the first triode is connected with a first relay in series, the first relay is connected with a positive terminal, and an emitter of the first triode is grounded.
In one embodiment, a potentiometer is connected to a positive input end of the second control element, the potentiometer is connected to the second control element, a third capacitor is further connected to an input end of the third control element, and an emitter of the first triode is grounded;
the first relay is connected with a third diode, and a fourth diode is connected in series between the collector of the first triode and the first relay.
In one embodiment, the control circuit further includes a fourth filter element and a fifth filter element, the fifth filter element is connected to a fifth light emitting diode, and the fifth light emitting diode is grounded through a ninth resistor.
In one embodiment, the plurality of constant current source circuits includes a first constant current source circuit, a second constant current source circuit, and a third constant current source circuit, the plurality of loop thyristors includes a first loop thyristor, a second loop thyristor, a third loop thyristor, a fourth loop thyristor, a fifth loop thyristor, and a sixth loop thyristor, input ends of the first loop thyristor and the second loop thyristor are connected to an output end of the first constant current source circuit, input ends of the third loop thyristor and the fourth loop thyristor are connected to an output end of the second constant current source circuit, and input ends of the fifth loop thyristor and the sixth loop thyristor are connected to an output end of the third constant current source circuit.
In one embodiment, the first constant current source circuit includes a second triode, a third triode, a fourth optocoupler, a fifth optocoupler, a first output end and a second output end, a base of the second triode is connected with a collector of the third triode, a collector of the third triode is further connected with a positive terminal through a tenth resistor, an emitter of the third triode is connected with a negative electrode of a power supply, a collector of the second triode is connected with the fifth optocoupler, an emitter of the second triode is connected with a base of the third triode through an eleventh resistor and a negative electrode of the power supply, the fifth optocoupler is connected with the fourth optocoupler in series, the first output end is connected with the fourth optocoupler, and the second output end is connected with the fifth optocoupler;
the second constant current source circuit comprises a fourth triode, a fifth triode, a sixth optocoupler element, a seventh optocoupler element, a third output end and a fourth output end, wherein a base of the fourth triode is connected with a collector of the fifth triode, a collector of the fifth triode is also connected with a positive terminal through a fifteenth resistor, an emitter of the fifth triode is connected with a negative electrode of a power supply, a collector of the fourth triode is connected with the seventh optocoupler element, an emitter of the fourth triode is connected with a base of the fifth triode through a sixteenth resistor and a negative electrode of the power supply, the seventh optocoupler element is connected with the sixth optocoupler element in series, the third output end is connected with the sixth optocoupler element, and the fourth output end is connected with the seventh optocoupler element;
the third constant current source circuit comprises a sixth triode, a seventh triode, an eighth optocoupler element, a ninth optocoupler element, a fifth output end and a sixth output end, wherein the base of the sixth triode is connected with the collector of the seventh triode, the collector of the seventh triode is further connected with the positive terminal through a twentieth resistor, the emitter of the seventh triode is connected with the negative electrode of a power supply, the collector of the sixth triode is connected with the ninth optocoupler element, the emitter of the sixth triode is connected with the base of the seventh triode through a twenty-first resistor and the negative electrode of the power supply, the ninth optocoupler element is connected with the eighth optocoupler element in series, the fifth output end is connected with the eighth optocoupler element, and the sixth output end is connected with the ninth optocoupler element.
In one embodiment, the main switch circuit further includes a first protection circuit, a second protection circuit and an eighth triode, the first protection circuit includes a third transformer, a ninth diode and a tenth optical coupling element, the third transformer is connected with a twenty-eighth resistor, the third transformer is connected with the ninth diode in series, the twenty-eighth resistor is connected with a one-phase power supply in series, the third transformer is connected with the tenth optical coupling element, an emitter of the tenth optical coupling element is grounded, a collector is connected with a base of the eighth triode, an emitter of the eighth triode inputs voltage, and the collector is grounded through a second relay;
the second protection circuit comprises a fourth transformer, a twelfth polar tube and an eleventh optical coupling element, wherein the fourth transformer is connected with a thirty-first resistor, the fourth transformer is connected with the twelfth polar tube in series, the thirty-first resistor is connected to a one-phase power supply in series, the fourth transformer is connected with the eleventh optical coupling element, an emitting electrode of the eleventh optical coupling element is grounded, a collecting electrode is connected with a base electrode of the eighth polar tube, voltage is input to the emitting electrode of the eighth polar tube, and the collecting electrode is grounded through the second relay.
In one embodiment, the three-phase power supply comprises a first-phase power supply, a second-phase power supply and a third-phase power supply, the first-phase power supply is connected with a sixth diode through a twenty-fifth resistor, and the sixth diode is connected with a neutral line;
the second-phase power supply is connected with a seventh diode through a twenty-sixth resistor, and the seventh diode is connected with the neutral line;
and the third phase power supply is connected with an eighth diode through a twenty-seventh resistor, and the eighth diode is connected with the neutral line.
According to the three-phase contactless circuit breaker, the current detected by the current transformer in the current detection circuit is changed into alternating current voltage through the sampling resistor, then the alternating current voltage is obtained through the rectifier element, and the voltage cannot enable the first optical coupler element to be conducted in a normal working range. The voltage of the reverse input end of the control element is certainly larger than the voltage of the forward input end, so that the output end of the control element is low voltage, when the input voltage is smaller than two thirds of the power supply voltage, the first triode can be conducted, the power supply voltage provides a control voltage for the control circuit through the first relay, the control circuit enables the main switch circuit to normally work through the constant current source circuit, then the detection current is obtained from the main switch circuit, if the detection current is far larger than a specified threshold value, a signal is sent to the current detection circuit, and the control circuit sends the signal to the main switch circuit and turns off the main switch circuit. Therefore, the three-phase contactless breaker realizes that the circuit can be conducted and normally run only when the circuit has the conduction qualification through the mutual matching of the current detection circuit, the control circuit and the main switch circuit, so that any phase current can play the same role when exceeding a set threshold, the circuit can be timely broken according to the circuit condition, and the reliability is higher.
Drawings
Fig. 1 is a schematic diagram of a circuit structure of a three-phase contactless breaker according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a current detection circuit according to the present embodiment;
FIG. 3 is a schematic diagram of a control circuit according to the present embodiment;
fig. 4 is a schematic diagram of the main switch circuit of the present embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used in the description of the present application are for illustrative purposes only and do not represent the only embodiments.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may mean that the first feature is in direct contact with the second feature or that the first feature is in indirect contact with the second feature via an intermediate medium. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the description of the present application, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1 to 4, in one embodiment, a three-phase contactless breaker includes:
the current detection circuit comprises a current transformer, a rectifying element, a first optocoupler element, a control element and a first triode, wherein a primary side of the current transformer is connected with a three-phase power supply, a secondary side of the current transformer is connected with an alternating current end of the rectifying element, the control element is connected with the rectifying element through the first optocoupler element, an output end of the control element is connected with a base electrode of the first triode, a collector electrode of the first triode is connected with a first relay, and an emitting electrode of the first triode is grounded.
The input end of the control circuit is connected with the output end of the current detection circuit, the output voltage is led to the input end of the control circuit through the first relay, and the control circuit comprises a plurality of constant current source circuits and an optical coupler output loop.
The main switch circuit comprises a plurality of loop thyristors which are composed of unidirectional thyristors and capacitance elements, and every two loop thyristors are connected with a phase power supply.
The detection signal of the current detection circuit part is transmitted to the control circuit, the control circuit sends a signal in a normal range to enable the main switch circuit to work normally, then the detection current is obtained from the main switch circuit, if the detection current is far larger than a first threshold value, the signal is sent to the current detection circuit, and the control circuit sends a signal to the main switch circuit to turn off the main switch circuit.
According to the three-phase contactless circuit breaker, the current detected by the current transformer in the current detection circuit is changed into alternating current voltage through the sampling resistor, then the alternating current voltage is obtained through the rectifier element, and the voltage cannot enable the first optical coupler element to be conducted in a normal working range. The voltage of the reverse input end of the control element is larger than the voltage of the forward input end, the output end of the control element is low voltage, when the input voltage is smaller than two thirds of the power supply voltage, the first triode can be conducted, the power supply voltage provides a control voltage for the control circuit through the first relay, the control circuit enables the main switch circuit to normally work through the constant current source circuit, then the detection current is obtained from the main switch circuit, if the detection current is far larger than the specified threshold value, the control circuit sends a signal to the current detection circuit, and the control circuit sends a signal to the main switch circuit and turns off the main switch circuit. Therefore, the three-phase contactless breaker realizes that the circuit can be conducted and normally run only when the circuit has the conduction qualification through the mutual matching of the current detection circuit, the control circuit and the main switch circuit, so that any phase current can play the same role when exceeding a set threshold, the circuit can be timely broken according to the circuit condition, and the reliability is higher.
In this embodiment, the current transformer includes a first transformerCurrent transformer L 1 And a second current transformer L 2 The rectifying element comprises a first rectifier B 1 And a second rectifier B 2 The control element comprises a second control element IC 2 And a third control element IC 3 First current transformer L 1 And a second current transformer L 2 Connected to a three-phase power supply, a first rectifier B 1 The AC end is connected with a first current transformer L 1 Secondary side, second current transformer L 2 A second rectifier B is connected to the secondary side 2 AC terminal, first rectifier B 1 The output end of the first diode D is connected in series 1 Second rectifier B 2 The output end of the first diode D is connected in series with a second diode D 2 First rectifier B 1 And a second rectifier B 2 The output end branches of the three-phase current transformer form a closed loop.
The current detection circuit also comprises a first sampling resistor R 1 First diode D 1 A second diode D 2 And a first sampling resistor R 1 Forming an OR gate circuit, a first sampling resistor R 1 Is connected with a first optical coupling element IC 1 First optical coupling element IC 1 Respectively with the second control element IC 2 And a third control element IC 3 Is connected to the input terminal of the first optocoupler element IC 1 Is grounded, a second control element IC 2 And the third control element IC 3 Is connected to the input terminal of the third control element IC 3 The output end of the first triode T is connected with 1 A first triode T 1 The collector of the relay is connected in series with a first relay J 1 First relay J 1 A first triode T connected with the positive terminal 1 The emitter of (2) is grounded.
Second control element IC 2 The positive input end of the voltage regulator is connected with a potentiometer R 5 Potentiometer R 5 And a second control element IC 2 Connected, third control element IC 3 Is also connected with a third capacitor C 3 A first triode T 1 The emitter of (2) is grounded. First relay J 1 Is connected with a third diode D 3 A first triode T 1 Collector electrode of andfirst relay J 1 Between which a fourth diode D is connected in series 4 。
In particular, a first current transformer L 1 And a second current transformer L 2 Connected to a three-phase power supply, a first current transformer L 1 And a second current transformer L 2 The detected current passes through a first sampling resistor R 1 To be converted into an AC voltage, and then through a first rectifier B 1 And a second rectifier B 2 Rectified to obtain a voltage V x . In the normal operating range, the voltage V x Disabling the first optocoupler IC 1 And conducting. Second control element IC 2 Must be greater than the positive input voltage V +. Thus the second control element IC 2 The output terminal of (a) is at a low voltage. The low voltage is the third control element IC 3 Input voltage V of 2 The third control element IC 3 Serves as an input voltage V of the 555 circuit for the 555 circuit 2 <2/3Vcc, the output voltage V of its output end 3 At a low level, a first triode T 1 Can not be conducted, and the power supply voltage Vcc passes through the first relay J 1 The coil provides a control voltage to the control circuit.
It should be noted that the first diode D in the current detection circuit 1 A second diode D 2 And a first sampling resistor R 1 Forming an or gate circuit, any phase current exceeding a set threshold will do the same. When the current detection circuit detects a voltage, the first optical coupling element IC can be enabled 1 On, then the second control element IC 2 The inverting input terminal of (2) is at low level, a second control element IC 2 The forward terminal voltage must be greater than the reverse terminal. When three control elements IC 3 Input voltage V of 2 >At 2/3Vcc, the first triode T 1 The light emitting tube (red) is on. While the first relay J 1 On, the first relay J 1 The switch between the main switch circuit and the control circuit is disconnected, the power supply of the control circuit is cut off, the control circuit cannot work, and a signal cannot be output to trigger a loop thyristor of the main switch circuit, so that the main switch circuit is cut off.
In bookIn an embodiment, the control circuit further comprises a fourth filter element C 4 And a fifth filter element C 5 Fifth filter element C 5 Is connected with a fifth light-emitting diode D 5 Fifth light emitting diode D 5 Through a ninth resistor R 9 And (4) grounding. The multiple constant current source circuits include a first constant current source circuit, a second constant current source circuit, and a third constant current source circuit, and the multiple loop thyristors include a first loop thyristor SCR 1 And a second loop thyristor SCR 2 And a third loop thyristor SCR 3 And a fourth loop thyristor SCR 4 And a fifth loop thyristor SCR 5 And a sixth loop thyristor SCR 6 First loop thyristor SCR 1 And a second loop thyristor SCR 2 The input end of the first constant current source circuit is connected with the output end of the first constant current source circuit, and the third loop thyristor SCR 3 And a fourth loop thyristor SCR 4 The input end of the first constant current source circuit is connected with the output end of the second constant current source circuit, and the thyristor SCR of the fifth loop is connected with the output end of the second constant current source circuit 5 And a sixth loop thyristor SCR 6 Is connected to the output of the third constant current source circuit.
The first constant current source circuit comprises a second triode T 2 A third triode T 3 And a fourth optical coupling element IC 4 And a fifth optical coupling element IC 5 A first output terminal G 1 And a second output terminal G 2 A second triode T 2 Base and third triode T 3 Is connected to the collector of a third triode T 3 Is also passed through a tenth resistor R 10 A third triode T connected with the positive terminal 3 The emitting electrode of the second triode T is connected with the negative electrode of the power supply 2 Collector and fourth optocoupler IC 4 Connected to a second triode T 2 And the third triode T 3 Through an eleventh resistor R 11 A fourth optical coupling element IC connected with the negative electrode of the power supply 4 With a fifth optocoupler element IC 5 In series, a first output terminal G 1 And a fourth optical coupling element IC 4 Connected, second output terminal G 2 And a fifth optical coupling element IC 5 And (4) connecting.
The second constant current source circuit comprises a fourth triode T 4 A fifth triode T 5 And a sixth optical coupling element IC 6 Seventh optical coupler element IC 7 And a third output terminal G 3 And a fourth output terminal G 4 Fourth triode T 4 Base and fifth triode T 5 Is connected to the collector of the fifth triode T 5 The collector of (2) is also connected with a fifteenth resistor R 15 A fifth triode T connected with the positive terminal 5 The emitting electrode of the first triode is connected with the negative electrode of the power supply, and the fourth triode T 4 Collector electrode and seventh optical coupling element IC 7 Connected to a fourth triode T 4 Emitter of and the fifth triode T 5 Through a sixteenth resistor R 16 A seventh optocoupler IC connected to the negative electrode of the power supply 7 And a sixth optical coupling element IC 6 In series, the third output terminal G 3 And the sixth optical coupling element IC 6 Connected, fourth output terminal G 4 And a seventh optical coupling element IC 7 And (4) connecting.
The third constant current source circuit comprises a sixth triode T 6 A seventh triode T 7 And an eighth optocoupler IC 8 And a ninth optical coupling element IC 9 And a fifth output terminal G 5 And a sixth output terminal G 6 The sixth triode T 6 Base and seventh triode T 7 Is connected with the collector of the seventh triode T 7 Is also passed through a twentieth resistor R 20 A seventh triode T connected with the positive terminal 7 The emitting electrode of the first triode is connected with the negative electrode of the power supply, and the sixth triode T 6 Collector and ninth optocoupler IC 9 Connected, a sixth triode T 6 Emitter of and seventh triode T 7 The base electrode passes through a twenty-first resistor R 21 A ninth optical coupling element IC connected with the negative electrode of the power supply 9 And an eighth optical coupling element IC 8 In series, the fifth output terminal G 5 And an eighth optical coupling element IC 8 Connected, sixth output terminal G 6 And a ninth optical coupling element IC 9 And (4) connecting.
Specifically, when the output voltage Vcc (12 or 15V) from the current detection circuit A is passed through the DW regulator R 8 And (7) stabilizing the pressure. Then, a fourth filter C is set 4 And a fifth filter C 5 Filtering to remove clutter and passing through a second triode T 2 And a third triode T 3 The first constant current source circuit of (1) makes the fourth optical coupling element IC 4 And a fifth optical coupler element IC 5 Is conducted, the first output terminal G 1 And a second output terminal G 2 First loop thyristor SCR (silicon controlled rectifier) with output triggering main switch circuit 1 And a second loop thyristor SCR 2 And conducting. In the same way, the third output terminal G 3 And a fourth output terminal G 4 And a fifth output terminal G 5 And a sixth output terminal G 6 Respectively triggering third loop thyristor SCR 3 And a fourth loop thyristor SCR 4 And a fifth loop thyristor SCR 5 And a sixth loop thyristor SCR 6 Is conducted during the normal operation period 5 Green light is emitted.
In this embodiment, the main switch circuit further includes a first protection circuit, a second protection circuit, and an eighth transistor T 8 The first protection circuit comprises a third transformer B 3 The ninth diode D 9 And a tenth optical coupling element IC 10 Third transformer B 3 Is connected with a twenty-eighth resistor R 28 Third transformer B 3 And a ninth diode D 9 Series connected, twenty eighth resistor R 28 A third transformer B connected in series to a phase power supply 3 Is connected with a tenth optical coupling element IC 10 The tenth optical coupling element IC 10 The emitting electrode of the first triode is grounded, the collector electrode of the first triode is grounded, and the eighth triode T 8 The base of the eighth triode T is connected 8 The emitter of (1) inputs voltage, and the collector passes through a second relay J 2 And (4) grounding.
The second protection circuit comprises a fourth transformer B 4 The twelfth polar tube D 10 And an eleventh optical coupler element IC 11 Transformer B 3 Or B 4 Is connected with a thirty-first resistor R 31 Fourth transformer B 4 And the twelfth polar tube D 10 Series, thirty-first resistor R 31 A fourth transformer B connected in series to a phase power supply 4 Is connected with an eleventh optical coupler element IC 11 Eleventh optical coupler element IC 11 Is grounded, the collector is grounded with the eighthTriode T 8 The base of the eighth triode T is connected 8 The emitter of (1) inputs voltage, and the collector passes through a second relay J 2 And (4) grounding.
The three-phase power supply comprises a first-phase power supply, a second-phase power supply and a third-phase power supply, wherein the first-phase power supply AA1 passes through a twenty-fifth resistor R 25 Is connected with a sixth diode D 6 A sixth diode D 6 Connected to the neutral line N. The second phase power supply BB1 passes through a twenty-sixth resistor R 26 Is connected with a seventh diode D 7 Seventh diode D 7 Connected to the neutral line N. The third phase power supply CC1 passes through a twenty-seventh resistor R 27 Is connected with an eighth diode D 8 Eighth diode D 8 Connected to the neutral line N.
Specifically, the main switch circuit is composed of a first loop thyristor SCR 1 And a second loop thyristor SCR 2 And a third loop thyristor SCR 3 And a fourth loop thyristor SCR 4 And a fifth loop thyristor SCR 5 And a sixth loop thyristor SCR 6 And (4) forming. Anti-interference capacitor C 6 、C 7 、C 8 、C 9 、C 10 、C 11 The first circuit thyristor SCR is respectively arranged for resisting interference 1 And a second loop thyristor SCR 2 And a third loop thyristor SCR 3 And a fourth loop thyristor SCR 4 And a fifth loop thyristor SCR 5 And a sixth loop thyristor SCR 6 Are connected with each other. Third resistor R 28 Or R 31 And a transformer B 3 Or B 4 Forming a short-circuit protection circuit. Once the load is short circuited, the current is very high despite the twenty-eighth resistor R 28 Or a thirty-first resistance R 31 The resistance is small but the pressure drop over it is also large. Through a third transformer B 3 Or a fourth transformer B 4 Then passes through a ninth diode D 9 Or the twelfth pole tube D 10 And a twenty-ninth resistor R 29 Or a thirty-second resistance R 32 To make the tenth optical coupling element IC 10 Or eleventh optical coupler element IC 11 Is turned on to make the input voltage V x Through an eighth triode T 8 Emitter and resistor thirty secondResistance R 30 Or a thirty-third resistor R 33 And a tenth optical coupling element IC 10 Or eleventh optical coupler element IC 11 The collector is conductive. Thus, the eighth transistor T 8 Is turned on, the second relay J 2 Get electricity to conduct. Due to the second relay J 2 The normally closed contact of the second relay is connected in series with the output end of the current detection circuit 2 When the switch is turned on, the normally closed contact is turned off, and the power supply of the control circuit is cut off, so that the six-loop thyristors of the main switch are immediately turned off when the trigger signals are lost. Similarly, the large current of the C phase is detected to make the second relay J 2 And conducting. When the switch works normally, the main switch is turned on because the thyristor is conducted, and the sixth diode D 6 The seventh diode D 7 And an eighth diode D 8 The three luminous tubes are on. Once the loop thyristor is turned off, the three luminous tubes are not lighted, and the three luminous tubes are relatively intuitive.
It should be noted that, firstly, the unidirectional thyristor is required to be used, but the bidirectional thyristor can not be used, the di/dt and dv/dt of the former is better than that of the latter, especially the bidirectional thyristor has low two indexes of di/dt and dv/dt in commutation, and the unidirectional thyristor avoids the problem. Secondly, the 'surge current' index needs to be considered, the relationship between the surge current and the frequency (time) needs to be considered, and a tube with small on-state peak voltage drop needs to be selected. The "rated current" of a particular SSPC product is related to the selected maximum current thyristor, which must be larger than the former.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A three-phase contactless circuit breaker, comprising:
the current detection circuit comprises a current transformer, a rectifying element, a first optocoupler element, a control element and a first triode, wherein a primary side of the current transformer is connected with a three-phase power supply, a secondary side of the current transformer is connected with an alternating current end of the rectifying element, the control element is connected with the rectifying element through the first optocoupler element, an output end of the control element is connected with a base electrode of the first triode, a collector electrode of the first triode is connected with a first relay, and an emitting electrode of the first triode is grounded;
the input end of the control circuit is connected with the output end of the current detection circuit, the output voltage is led to the input end of the control circuit through the first relay, and the control circuit comprises a plurality of constant current source circuits and an optocoupler output loop;
the main switch circuit comprises a plurality of loop thyristors formed by unidirectional thyristors and capacitance elements, and each two groups of loop thyristors are connected to a phase power supply;
and part of detection signals of the current detection circuit are transmitted to the control circuit, the control circuit sends signals in a normal range to enable the main switch circuit to work normally, then detection current is obtained from the main switch circuit, and if the detection current is far larger than a first threshold value, signals are sent to the current detection circuit to enable the control circuit to send signals to the main switch circuit to turn off the main switch circuit.
2. The three-phase contactless circuit breaker according to claim 1, wherein the current transformer includes a first current transformer and a second current transformer, the rectifying element includes a first rectifier and a second rectifier, the control element includes a second control element and a third control element, the first current transformer and the second current transformer are connected to a three-phase power supply, the alternating current terminal of the first rectifier is connected to the secondary side of the first current transformer, the secondary side of the second current transformer is connected to the alternating current terminal of the second rectifier, the output terminal of the first rectifier is connected in series to a first diode, the output terminal of the second rectifier is connected in series to a second diode, and the output terminal branches of the first rectifier and the second rectifier form a closed loop.
3. The three-phase contactless breaker according to claim 2, characterized in that the current detection circuit further includes a first sampling resistor, the first diode, the second diode and the first sampling resistor form an or gate circuit, the first sampling resistor is connected to the first optical coupler element, a collector of the first optical coupler element is connected to the inverting input terminal of the second control element and the input terminal of the third control element, respectively, an emitter of the first optical coupler element is grounded, an output terminal of the second control element is connected to the input terminal of the third control element, an output terminal of the third control element is connected to a first triode, a collector of the first triode is connected in series to a first relay, the first relay is connected to a positive terminal, and an emitter of the first triode is grounded.
4. The three-phase contactless circuit breaker according to claim 2 is characterized in that a potentiometer is connected to the positive input end of the second control element, the potentiometer is connected to the second control element, a third capacitor is further connected to the input end of the third control element, and the emitter of the first triode is grounded;
the first relay is connected with a third diode, and a fourth diode is connected in series between the collector of the first triode and the first relay.
5. The three-phase contactless circuit breaker according to claim 1 is characterized in that the control circuit further comprises a fourth filter element and a fifth filter element, the fifth filter element is connected with a fifth light emitting diode, and the fifth light emitting diode is grounded through a ninth resistor.
6. The three-phase contactless circuit breaker according to claim 1, wherein the plurality of constant current source circuits includes a first constant current source circuit, a second constant current source circuit, and a third constant current source circuit, the plurality of loop thyristors include a first loop thyristor, a second loop thyristor, a third loop thyristor, a fourth loop thyristor, a fifth loop thyristor, and a sixth loop thyristor, input ends of the first loop thyristor and the second loop thyristor are connected to an output end of the first constant current source circuit, input ends of the third loop thyristor and the fourth loop thyristor are connected to an output end of the second constant current source circuit, and input ends of the fifth loop thyristor and the sixth loop thyristor are connected to an output end of the third constant current source circuit.
7. The three-phase contactless circuit breaker according to claim 6, wherein the first constant current source circuit includes a second triode, a third triode, a fourth optocoupler, a fifth optocoupler, a first output terminal and a second output terminal, a base of the second triode is connected to a collector of the third triode, a collector of the third triode is further connected to a positive terminal through a tenth resistor, an emitter of the third triode is connected to a negative terminal of a power supply, a collector of the second triode is connected to the fifth optocoupler, an emitter of the second triode is connected to a base of the third triode through an eleventh resistor and a negative terminal of the power supply, the fifth optocoupler is connected to a fourth optocoupler, the first output terminal is connected to the fourth optocoupler, and the second output terminal is connected to the fifth optocoupler;
the second constant current source circuit comprises a fourth triode, a fifth triode, a sixth optocoupler element, a seventh optocoupler element, a third output end and a fourth output end, wherein a base of the fourth triode is connected with a collector of the fifth triode, a collector of the fifth triode is also connected with a positive terminal through a fifteenth resistor, an emitter of the fifth triode is connected with a negative electrode of a power supply, a collector of the fourth triode is connected with the seventh optocoupler element, an emitter of the fourth triode is connected with a base of the fifth triode through a sixteenth resistor and a negative electrode of the power supply, the seventh optocoupler element is connected with the sixth optocoupler element in series, the third output end is connected with the sixth optocoupler element, and the fourth output end is connected with the seventh optocoupler element;
the third constant current source circuit comprises a sixth triode, a seventh triode, an eighth optocoupler element, a ninth optocoupler element, a fifth output end and a sixth output end, wherein the base of the sixth triode is connected with the collector of the seventh triode, the collector of the seventh triode is further connected with the positive terminal through a twentieth resistor, the emitter of the seventh triode is connected with the negative electrode of a power supply, the collector of the sixth triode is connected with the ninth optocoupler element, the emitter of the sixth triode is connected with the base of the seventh triode through a twenty-first resistor and the negative electrode of the power supply, the ninth optocoupler element is connected with the eighth optocoupler element in series, the fifth output end is connected with the eighth optocoupler element, and the sixth output end is connected with the ninth optocoupler element.
8. The three-phase contactless circuit breaker according to claim 1, wherein the main switch circuit further includes a first protection circuit, a second protection circuit and an eighth triode, the first protection circuit includes a third transformer, a ninth diode and a tenth optocoupler, the third transformer is connected with a twenty-eighth resistor, the third transformer is connected with the ninth diode in series, the twenty-eighth resistor is connected with a one-phase power supply in series, the third transformer is connected with the tenth optocoupler, an emitter of the tenth optocoupler is grounded, a collector is connected with a base of the eighth triode, an emitter of the eighth triode inputs a voltage, and the collector is grounded through a second relay;
the second protection circuit comprises a fourth transformer, a twelfth polar tube and an eleventh optical coupling element, wherein the fourth transformer is connected with a thirty-first resistor, the fourth transformer is connected with the twelfth polar tube in series, the thirty-first resistor is connected to a one-phase power supply in series, the fourth transformer is connected with the eleventh optical coupling element, an emitting electrode of the eleventh optical coupling element is grounded, a collecting electrode is connected with a base electrode of the eighth polar tube, voltage is input to the emitting electrode of the eighth polar tube, and the collecting electrode is grounded through the second relay.
9. The three-phase contactless circuit breaker according to claim 8, characterized in that the three-phase power supply includes a first phase power supply, a second phase power supply and a third phase power supply, the first phase power supply is connected with a sixth diode through a twenty-fifth resistor, the sixth diode is connected with a neutral line;
the second-phase power supply is connected with a seventh diode through a twenty-sixth resistor, and the seventh diode is connected with the neutral line;
and the third phase power supply is connected with an eighth diode through a twenty-seventh resistor, and the eighth diode is connected with the neutral line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222707347.2U CN218568762U (en) | 2022-10-14 | 2022-10-14 | Three-phase contactless breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222707347.2U CN218568762U (en) | 2022-10-14 | 2022-10-14 | Three-phase contactless breaker |
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| Publication Number | Publication Date |
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| CN218568762U true CN218568762U (en) | 2023-03-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222707347.2U Active CN218568762U (en) | 2022-10-14 | 2022-10-14 | Three-phase contactless breaker |
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| Country | Link |
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| CN (1) | CN218568762U (en) |
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2022
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