A control circuit for a power converter and an AC switch

Abstract

The present application provides a control circuit for a power converter and an AC switch. In the control circuit, since the potential of the signal outputted by the output end of the first conversion circuit is the same as the effective potential of the signal for controlling the AC switch to perform a closing operation when the trigger logic circuit is triggered, the AC switch performs a closing operation in this case; and since the potential of the signal received by the input side of the trigger logic circuit meets the only trigger condition when the potential of the opening signal is its own invalid potential, the potential of the closing signal is its own effective potential, and the potential of the undervoltage removal signal is its own effective potential, the potential of the signal received by the input side of the trigger logic circuit satisfies the only trigger condition, the AC switch can perform a closing operation only in this case, instead of performing a closing operation as long as the potential of the closing signal is an effective potential, thereby avoiding abnormal operation of the AC switch.

Description

Technical Field

[0001] The utility model relates to the technical field of switch control, in particular to a control circuit of a power converter and an AC switch. Background Art

[0002] The electric operator in the AC switch is used to perform opening and closing operations, and the undervoltage release in the AC switch is used for emergency tripping when a device connected to the AC switch fails.

[0003] Normally, when the AC switch operates normally, it is necessary to control the undervoltage release and the electric operator to cooperate with each other. If the cooperation is improper, the AC switch may operate abnormally. In addition, when the AC switch receives both the closing signal and the opening signal at the same time, the AC switch may also operate abnormally. Once the AC switch operates abnormally, it may cause serious damage to itself or the machine connected to it.

[0004] Therefore, how to avoid abnormal operation of the AC switch is a technical problem that needs to be solved urgently. Utility Model Content

[0005] In view of this, the utility model provides a control circuit of a power converter and an AC switch to prevent abnormal operation of the AC switch.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] On one hand, the present application provides a control circuit of an AC switch, comprising: a trigger logic circuit, a signal matching circuit and a first conversion circuit; wherein:

[0008] The three input ends of the trigger logic circuit respectively receive the opening signal, the closing signal and the undervoltage removal signal through the signal matching circuit;

[0009] The output end of the trigger logic circuit is connected to the input end of the first conversion circuit, and the output end of the first conversion circuit is connected to the closing input end of the AC switch;

[0010] In the case where the potential of the opening signal is its own invalid potential, the potential of the closing signal is its own valid potential, and the potential of the undervoltage removal signal is its own valid potential, the potentials of the signals received by the three input terminals of the trigger logic circuit meet the only trigger condition of the trigger logic circuit;

[0011] When the trigger logic circuit is triggered, the potential of the signal outputted from the output end of the first conversion circuit is the same as the effective potential of the signal for controlling the AC switch to perform a closing operation.

[0012] Optionally, the unique trigger condition includes: the potentials of the signals received at the input side of the trigger logic circuit are all the same.

[0013] Optionally, if the effective potential of the opening signal, the effective potential of the closing signal and the effective signal of the undervoltage removal signal meet the unique trigger condition, the signal matching circuit includes: a first inverter and two first connecting cables; wherein:

[0014] An input end of the trigger logic circuit receives the opening signal through the first inverter;

[0015] The other two input terminals on the input side of the trigger logic circuit respectively receive the closing signal and the undervoltage removal signal through the first connection cables corresponding to the first connection cables.

[0016] Optionally, if the invalid potential of the opening signal, the invalid potential of the closing signal and the invalid signal of the undervoltage removal signal meet the unique trigger condition, the signal matching circuit includes: a second connecting cable and two second inverters; wherein:

[0017] An input end of the trigger logic circuit receives the trip signal through the second connecting cable;

[0018] The other two input terminals of the trigger logic circuit receive the closing signal and the undervoltage removal signal respectively through the second inverters corresponding to the respective ones.

[0019] Optionally, if the trigger logic circuit is triggered, the potential of the signal received at the input end of the first conversion circuit is the same as the effective potential of the signal for controlling the AC switch to perform a closing operation, then the first conversion circuit includes: a third connecting cable, or a third inverter and a fourth inverter; wherein:

[0020] The output end of the trigger logic circuit is connected to the closing input end through the third connecting cable;

[0021] or,

[0022] The input end of the third inverter is connected to the output end of the trigger logic circuit, the output end of the third inverter is connected to the input end of the fourth inverter, and the output end of the fourth inverter is connected to the closing input end.

[0023] Optionally, if the trigger logic circuit is triggered, the potential of the signal received by the input end of the first conversion circuit is different from the effective potential of the signal for controlling the AC switch to perform a closing operation, then the first conversion circuit includes: a fifth inverter; wherein:

[0024] The output end of the trigger logic circuit is connected to the closing input end through the fifth inverter.

[0025] Optionally, it further includes: a second conversion circuit and a third conversion circuit; wherein:

[0026] The opening input terminal of the AC switch receives the opening signal through the second conversion circuit;

[0027] The undervoltage removal input terminal of the AC switch receives the undervoltage removal signal through the third conversion circuit.

[0028] Optionally, for any conversion circuit of the second conversion circuit and the third conversion circuit, if the effective potential of the signal received at its input end is the same as the effective potential of the signal output at its output end, it includes: a fourth connecting cable; wherein:

[0029] The corresponding input end of the AC switch receives the corresponding signal through the fourth connecting cable.

[0030] Optionally, for any conversion circuit of the second conversion circuit and the third conversion circuit, if the effective potential of the signal received at its input end is different from the effective potential of the signal output at its output end, it includes: a sixth inverter; wherein:

[0031] The corresponding input end of the AC switch receives the corresponding signal through the sixth inverter.

[0032] Another aspect of the present application provides a power converter, comprising: a power conversion circuit, a controller, an AC switch, and a control circuit of the AC switch as described in any one of the previous aspects of the present application; wherein:

[0033] The first side of the power conversion circuit is connected to one end of the AC switch, and the first side of the power conversion circuit is the AC side;

[0034] The power conversion circuit is controlled by the controller;

[0035] The three output terminals of the controller respectively output an opening signal, a closing signal and an undervoltage relief signal to the control circuit of the AC switch.

[0036] Optionally, the AC switch includes: a molded case circuit breaker.

[0037] It can be seen from the above technical solution that the utility model provides a control circuit for an AC open tube. In the control circuit, since the potential of the signal outputted by the output end of the first conversion circuit is the same as the effective potential of the signal for controlling the AC switch to perform a closing operation when the trigger logic circuit is triggered, the AC switch performs a closing operation in this case; and since the potential of the signal received by the input side of the trigger logic circuit meets the only trigger condition when the potential of the opening signal is its own invalid potential, the potential of the closing signal is its own effective potential, and the potential of the undervoltage removal signal is its own effective potential, the potential of the signal received by the input side of the trigger logic circuit satisfies the only trigger condition, the AC switch can perform a closing operation only in this case, instead of the AC switch performing a closing operation as long as the potential of the closing signal is an effective potential, thereby avoiding abnormal operation of the AC switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the utility model 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, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0039] Figure 1-Figure 11 They are structural schematic diagrams of eleven implementation modes of the AC open-tube control circuit provided in the present application;

[0040] Fig.12 This is a schematic diagram of the structure of the power converter provided in this application. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] In this application, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0043] In order to prevent abnormal operation of the AC switch, the present application provides a control circuit of the AC switch, and its specific structure is as follows: Figure 1 As shown, it specifically includes: a trigger logic circuit 10, a signal matching circuit 20 and a first conversion circuit 30; the connection relationship between the various components is specifically as follows:

[0044] The three input terminals of the trigger logic circuit 10 receive the opening signal, the closing signal and the undervoltage relief signal respectively through the signal matching circuit 20 .

[0045] Specifically, the first input end of the trigger logic circuit 10 is connected to the first output end of the signal matching circuit 20, the first input end of the signal matching circuit 20 serves as the first input end of the control circuit, and the first input end of the trigger logic circuit 10 receives the opening signal through the signal matching circuit 20; the second input end of the trigger logic circuit 10 is connected to the second output end of the signal matching circuit 20, the second input end of the signal matching circuit 20 serves as the second input end of the control circuit, and the second input end of the trigger logic circuit 10 receives the closing signal through the signal matching circuit 20; the third input end of the trigger logic circuit 10 is connected to the third output end of the signal matching circuit 20, the third input end of the signal matching circuit 20 serves as the third input end of the control circuit, and the third input end of the trigger logic circuit 10 receives the undervoltage relief signal through the signal matching circuit 20.

[0046] The trigger logic circuit 10 is a logic circuit that is triggered only when the signal received at its input side satisfies a unique condition; the unique condition satisfied when the trigger logic circuit 10 is triggered is called a unique trigger condition.

[0047] In a specific example, the only trigger condition includes: the potentials of the signals received by the input side of the trigger logic circuit 10 are all the same.

[0048] Optionally, the unique trigger condition may include: the potential of the signal received on the input side of the trigger logic circuit 10 is all high level, or may include: the potential of the signal received on the input side of the trigger logic circuit 10 is all low level. No specific limitation is made here, and it may depend on the specific situation and is within the protection scope of this application.

[0049] The above example only shows one implementation method of the unique trigger condition. In practical applications, including but not limited to this, no specific limitation is made here and it may be determined according to the specific circumstances, all of which are within the scope of protection of this application.

[0050] Optionally, the potential of the signal output by the trigger logic circuit 10 when it is triggered can be a high level or a low level, which is not specifically limited here and can be determined according to the specific circumstances, all within the protection scope of the present application.

[0051] It should be noted that the high level and the low level refer to two specific levels in the control circuit, among which the larger specific level is called the high level and the smaller specific level is called the low level; in practical applications, the specific values ​​of the two specific levels can be set according to the actual situation of the control circuit, and no specific limitation is made here.

[0052] The output end of the trigger logic circuit 10 is connected to the input end of the first conversion circuit 30 , and the output end of the first conversion circuit 30 is connected to the closing input end of the AC switch 40 .

[0053] In practical applications, the AC switch 40 usually includes an undervoltage releaser and an electric operator. The closing input terminal of the AC switch 40 is the closing input terminal of the electric operator. When the potential of the signal received by the closing input terminal of the electric operator is an effective potential, the electric operator performs a closing operation. In addition, the AC switch 40 also includes an opening input terminal and an undervoltage removal input terminal. The opening input terminal of the AC switch 40 is the opening input terminal of the electric operator. When the potential of the signal received by the opening input terminal of the electric operator is an effective potential, the electric operator performs an opening operation. The undervoltage removal input terminal of the AC switch 40 is the input terminal of the undervoltage releaser. When the potential of the signal received by the input terminal of the undervoltage releaser is an effective potential, the undervoltage releaser performs an undervoltage removal operation.

[0054] It should be noted that, in practical applications, electric operation refers to an electric operating mechanism, which is already very mature in this technical field and will not be described in detail here.

[0055] When the potential of the opening signal is an invalid potential, the potential of the closing signal is a valid potential, and the potential of the undervoltage removal signal is a valid potential, the potentials of the signals received by the three input terminals of the trigger logic circuit 10 meet the only trigger condition of the trigger logic circuit 10.

[0056] The effective potential refers to a potential that indicates that the corresponding signal is effective, whereas the invalid potential refers to a potential that indicates that the corresponding signal is invalid.

[0057] Optionally, the effective potential can be a high level or a low level, which is not specifically limited here and can be determined according to specific circumstances, all within the protection scope of this application.

[0058] It should be noted that the high level and the low level have been described in detail above and will not be repeated here.

[0059] When the trigger logic circuit 10 is triggered, the potential of the signal outputted from the output end of the first conversion circuit 30 is the same as the effective potential of the signal for controlling the AC switch 40 to perform a closing operation. In other words, when the trigger logic circuit 10 is triggered, the first conversion circuit 30 converts the potential of the signal outputted by the trigger logic circuit 10 into a potential that is the same as the effective potential of the signal for controlling the AC switch 40 to perform a closing operation.

[0060] For example, if the effective potential of the signal controlling the AC switch 40 to perform the closing operation is low, and the potential of the signal output by the trigger logic circuit 10 when it is triggered is high, the first conversion circuit 30 converts the high level to a low level.

[0061] It should be noted that the effective potential has been described in detail above and will not be repeated here.

[0062] Since, when the trigger logic circuit 10 is triggered, the potential of the signal outputted from the output end of the first conversion circuit 30 is the same as the effective potential of the signal controlling the AC switch 40 to perform a closing operation, the AC switch 40 performs a closing operation in this case; and since, when the potential of the opening signal is its own invalid potential, the potential of the closing signal is its own effective potential, and the potential of the undervoltage relief signal is its own effective potential, the potential of the signal received by the input side of the trigger logic circuit 10 satisfies the only triggering condition, the AC switch 40 can perform a closing operation only in this case, rather than the AC switch 40 performing a closing operation as long as the potential of the closing signal is a valid potential, thereby avoiding abnormal operation of the AC switch 40.

[0063] Another embodiment of the present application provides an implementation of a signal matching circuit 20, which is applicable to the case where the following conditions are met: the effective potential of the opening signal, the effective potential of the closing signal and the effective signal of the undervoltage removal signal meet a unique trigger condition.

[0064] For example, if the only trigger condition includes: the potentials of the signals received on the input side of the trigger logic circuit 10 are all high levels, then as long as the effective potential of the opening signal, the effective potential of the closing signal and the effective potential of the undervoltage removal signal are all high levels, it can be indicated that the effective potential of the opening signal, the effective potential of the closing signal and the effective signal of the undervoltage removal signal meet the only trigger condition.

[0065] The specific structure of this embodiment of the signal matching circuit 20 is as follows: Figure 2 As shown, it specifically includes: a first inverter 21 and two first connecting cables 22; the connection relationship between the components is specifically as follows:

[0066] An input end of the trigger logic circuit 10 receives a trip signal through the first inverter 21; specifically, the first input end of the trigger logic circuit 10 is connected to the output end of the first inverter 21, the input end of the first inverter 21 serves as the first input end of the control circuit, and the first input end of the trigger logic circuit 10 receives the trip signal through the first inverter 21.

[0067] The other two input terminals on the input side of the trigger logic circuit 10 receive the closing signal and the undervoltage relief signal respectively through the first connection cables 22 corresponding to the first connection cables 22 .

[0068] Specifically, the second input end of the trigger logic circuit 10 is connected to: one end of the first cable corresponding to it one-to-one, and the other end of the first cable corresponding to it one-to-one serves as the second input end of the control circuit, and the second input end of the trigger logic circuit 10 receives the closing signal through the first cable corresponding to it one-to-one; the third input end of the trigger logic circuit 10 is connected to: one end of the first cable corresponding to it one-to-one, and the other end of the first cable corresponding to it one-to-one serves as the third input end of the control circuit, and the third input end of the trigger logic circuit 10 receives the undervoltage relief signal through the first cable corresponding to it one-to-one.

[0069] It should be noted that the inverter and the connecting cable are already very mature devices in the prior art and will not be described in detail here.

[0070] This embodiment also provides an implementation of the signal matching circuit 20, which is applicable to the case where the following conditions are met: the invalid potential of the opening signal, the invalid potential of the closing signal and the invalid signal of the undervoltage removal signal meet the only trigger condition.

[0071] For example, if the only trigger condition includes: the potentials of the signals received on the input side of the trigger logic circuit 10 are all high levels, then as long as the invalid potential of the opening signal, the invalid potential of the closing signal and the invalid potential of the undervoltage removal signal are all high levels, it can be indicated that the invalid potential of the opening signal, the invalid potential of the closing signal and the invalid signal of the undervoltage removal signal meet the only trigger condition.

[0072] The specific structure of this embodiment of the signal matching circuit 20 is as follows: Figure 3 As shown, it specifically includes: a second connecting cable 23 and two second inverters 24; the connection relationship between the components is specifically as follows:

[0073] One input end of the trigger logic circuit 10 receives a trip signal through the second connecting cable 23; specifically, the first input end of the trigger logic circuit 10 is connected to one end of the second connecting cable 23, and the other end of the second connecting cable 23 serves as the first input end of the control circuit, and the first input end of the trigger logic circuit 10 receives a trip signal through the second connecting cable 23.

[0074] The other two input terminals of the trigger logic circuit 10 receive the closing signal and the undervoltage relief signal respectively through the second inverters 24 corresponding to the respective ones.

[0075] Specifically, the second input terminal of the trigger logic circuit 10 is connected to: the output terminal of the second inverter 24 corresponding to it one by one, and the input terminal of the second inverter 24 corresponding to it one by one serves as the second input terminal of the control circuit, and the second input terminal of the trigger logic circuit 10 receives the closing signal through the second inverter 24 corresponding to it one by one; the third input terminal of the trigger logic circuit 10 is connected to: the output terminal of the second inverter 24 corresponding to it one by one, and the input terminal of the second inverter 24 corresponding to it one by one serves as the third input terminal of the control circuit, and the third input terminal of the trigger logic circuit 10 receives the undervoltage removal signal through the second inverter 24 corresponding to it one by one.

[0076] It should be noted that the inverter and the connecting cable are already very mature devices in the prior art and will not be described in detail here.

[0077] The above are merely implementations of the signal matching circuit 20 in two different situations. In practical applications, including but not limited to these, no specific limitation is made here and all are within the protection scope of this application.

[0078] Another embodiment of the present application also provides an implementation of the first conversion circuit 30, which is applicable to the case where the following conditions are met: when the trigger logic circuit 10 is triggered, the potential of the signal received by the input end of the first conversion circuit 30 is the same as the effective potential of the signal controlling the AC switch 40 to perform a closing operation; its specific structure can be seen in Figure 4 ( Figure 4 Only in Figure 2 The device is shown on the basis of FIG. 3 ), specifically including: a third connecting cable 31; the connection relationship between this device and other devices is specifically described as follows:

[0079] The output end of the trigger logic circuit 10 is connected to one end of the third connecting cable 31 , and the other end of the third connecting cable 31 is connected to the closing input end.

[0080] It should be noted that the connecting cable is already a very mature device in the prior art and will not be described in detail here.

[0081] This embodiment also provides another implementation of the first conversion circuit 30, which is applicable to the case where the following conditions are met: when the trigger logic circuit 10 is triggered, the potential of the signal received by the input end of the first conversion circuit 30 is the same as the effective potential of the signal controlling the AC switch 40 to perform the closing operation; its specific structure can be seen in Figure 5 ( Figure 5 Only in Figure 2 The invention is shown on the basis of FIG. 3 , specifically including: a third inverter 32 and a fourth inverter 33; the connection relationship between the components is specifically as follows:

[0082] The input end of the third inverter 32 is connected to the output end of the trigger logic circuit 10 , the output end of the third inverter 32 is connected to the input end of the fourth inverter 33 , and the output end of the fourth inverter 33 is connected to the closing input end.

[0083] It should be noted that the inverter is already a very mature device in the prior art and will not be described in detail here.

[0084] This embodiment also provides another implementation of the first conversion circuit 30, which is applicable to the case where the following conditions are met: when the trigger logic circuit 10 is triggered, the potential of the signal received by the input end of the first conversion circuit 30 is different from the effective potential of the signal controlling the AC switch 40 to perform the closing operation; its specific structure can be seen in Figure 6 ( Figure 6 Only in Figure 2 The fifth inverter 34 is specifically shown on the basis of FIG. 3 , and specifically includes: a fifth inverter 34; the connection relationship between this device and other devices is specifically described as follows:

[0085] The output end of the trigger logic circuit 10 is connected to the input end of the fifth inverter 34 , and the output end of the fifth inverter 34 is connected to the closing input end.

[0086] It should be noted that the inverter is already a very mature device in the prior art and will not be described in detail here.

[0087] The above are only different implementations of the signal matching circuit 20 in different situations, which are not specifically limited here and can be determined according to specific circumstances, and are all within the protection scope of this application.

[0088] Another embodiment of the present application provides another implementation of the control circuit of the AC switch 40. The specific structure of the control circuit can be found in Figure 7 ( Figure 7 Only in Figure 6 On the basis of the above embodiment, it further includes: a second conversion circuit 50 and a third conversion circuit 60; the connection relationship between the components is as follows:

[0089] The opening input terminal of the AC switch 40 is connected to the output terminal of the second conversion circuit 50 , and the input terminal of the second conversion circuit 50 receives the opening signal.

[0090] The undervoltage removal input terminal of the AC switch 40 is connected to the output terminal of the third conversion circuit 60 , and the input terminal of the third conversion circuit 60 receives the undervoltage removal signal.

[0091] It should be noted that the opening input terminal of the AC switch 40 and the undervoltage relief input terminal of the AC switch 40 have been described in detail above and will not be repeated here.

[0092] This embodiment also provides an implementation of any conversion circuit of the second conversion circuit 50 and the third conversion circuit 60, which is applicable to the case where the effective potential of the signal received by the input end of the conversion circuit is the same as the effective potential of the signal output by the output end of the conversion circuit; for details of this implementation, please refer to Figure 8 ( Figure 8 Only in Figure 7 The fourth connecting cable 70 is specifically shown on the basis of FIG. 1 , and specifically includes: a fourth connecting cable 70; the connection relationship between this device and other devices is specifically described as follows:

[0093] The input end of the conversion circuit is connected to one end of the fourth connection cable 70 , and the other end of the fourth connection cable 70 is connected to the output end of the conversion circuit. In other words, the corresponding input end of the AC switch 40 receives the corresponding signal through the fourth connection cable 70 .

[0094] For example, if the effective potential of the signal received by the input end of the second conversion circuit 50 is the same as the effective potential of the signal output by the output end of the second conversion circuit 50 , the opening input end of the AC switch 40 receives the opening signal through the fourth connecting cable 70 .

[0095] This embodiment also provides an implementation of any conversion circuit of the second conversion circuit 50 and the third conversion circuit 60, which is applicable to the case where the effective potential of the signal received by the input end of the conversion circuit is different from the effective potential of the signal output by the output end of the conversion circuit; for details of this implementation, please refer to Fig. 9 ( Fig. 9 Only in Figure 7The sixth inverter 80 is specifically shown on the basis of FIG. 80 , and the connection relationship between this device and other devices is specifically described as follows:

[0096] The input end of the conversion circuit is connected to the output end of the sixth inverter 80 , and the input end of the sixth inverter 80 is connected to the output end of the conversion circuit. In other words, the corresponding input end of the AC switch 40 receives the corresponding signal through the sixth inverter 80 .

[0097] For example, if the effective potential of the signal received at the input end of the second conversion circuit 50 is different from the effective potential of the signal output at the output end of the second conversion circuit 50, the input end of the second conversion circuit 50 is connected to the output end of the sixth inverter 80, the input end of the sixth inverter 80 is connected to the output end of the second conversion circuit 50, and the opening input end of the AC switch 40 receives the opening signal through the sixth inverter 80.

[0098] The above are merely two implementations of any one of the second conversion circuit 50 and the third conversion circuit 60, which are not specifically limited here and can be determined according to specific circumstances, and are all within the protection scope of this application.

[0099] The present application provides an implementation of a trigger logic circuit 10, and its specific structure can be found in Fig.10 ( Fig.10 Only in Fig. 9 ), specifically including: a first AND gate 11 and a second AND gate 12.

[0100] The output end of the first AND gate 11 is connected to an input end of the second AND gate 12; the two input ends of the first AND gate 11 and the other input end of the second AND gate 12 serve as the three input ends of the trigger logic circuit 10 respectively; the output end of the second AND gate 12 serves as the output end of the trigger logic circuit 10.

[0101] It should be noted that the AND gate is already very mature in the prior art and will not be described in detail here.

[0102] This embodiment provides an implementation of the trigger logic circuit 10, and its specific structure is as follows: Fig.11 As shown, it specifically includes: a NOR gate 13.

[0103] The three input terminals of the NOR gate 13 are respectively used as the three input terminals of the trigger logic circuit 10 ; the output terminal of the NOR gate 13 is used as the output terminal of the trigger logic circuit 10 .

[0104] It should be noted that the NOR gate 13 is already very mature in the prior art and will not be described in detail here.

[0105] The above are only two implementations of the trigger logic circuit 10. In practical applications, including but not limited to these, no specific limitations are made here, and it can be determined according to specific circumstances, all of which are within the scope of protection of this application.

[0106] Another embodiment of the present application provides a power converter, the specific structure of which can be seen in Fig.12 ( Fig.12 Only in Fig.11 The invention is demonstrated on the basis of the invention), specifically including: a power conversion circuit 100, a controller 200, an AC switch 40 and a control circuit 300 of the AC switch 40 provided in the above embodiment of the present application; the connection relationship between the components is specifically described as follows:

[0107] The first side of the power conversion circuit 100 is connected to one end of the AC switch 40, and the first side of the power conversion circuit 100 is the AC side; the power conversion circuit 100 is controlled by the controller 200; the three output ends of the controller 200 respectively output the opening signal, the closing signal and the undervoltage relief signal to the control circuit 300 of the AC switch 40.

[0108] It should be noted that the power conversion circuit 100 is already very mature in the prior art and will not be described in detail here.

[0109] Optionally, the AC switch 40 may be a molded case circuit breaker. In practical applications, this includes but is not limited to this, which is not specifically limited here and may be determined according to specific circumstances, all of which are within the protection scope of this application.

[0110] It should be noted that frame circuit breakers and molded case circuit breakers are already very mature in the prior art and will not be described in detail here.

[0111] For the above description of the disclosed embodiments, the features recorded in each embodiment in this specification can be replaced or combined with each other, so that professional and technical personnel in this field can implement or use this application. The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as above with a preferred embodiment, it is not used to limit the utility model. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the utility model by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the utility model, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of protection of the technical solution of the utility model.

Claims

1. A control circuit for an AC switch, characterized in that: include: A trigger logic circuit, a signal matching circuit and a first conversion circuit; wherein: The three input ends of the trigger logic circuit respectively receive the opening signal, the closing signal and the undervoltage removal signal through the signal matching circuit; The output end of the trigger logic circuit is connected to the input end of the first conversion circuit, and the output end of the first conversion circuit is connected to the closing input end of the AC switch; In the case where the potential of the opening signal is its own invalid potential, the potential of the closing signal is its own valid potential, and the potential of the undervoltage removal signal is its own valid potential, the potentials of the signals received by the three input terminals of the trigger logic circuit meet the only trigger condition of the trigger logic circuit; When the trigger logic circuit is triggered, the potential of the signal outputted from the output end of the first conversion circuit is the same as the effective potential of the signal for controlling the AC switch to perform a closing operation.

2. The control circuit of the AC switch according to claim 1, characterized in that: The unique trigger condition includes: the potentials of the signals received by the input side of the trigger logic circuit are all the same.

3. The control circuit of the AC switch according to claim 1, characterized in that: If the effective potential of the opening signal, the effective potential of the closing signal and the effective signal of the undervoltage removal signal meet the only trigger condition, the signal matching circuit includes: a first inverter and two first connecting cables; wherein: An input end of the trigger logic circuit receives the opening signal through the first inverter; The other two input terminals on the input side of the trigger logic circuit respectively receive the closing signal and the undervoltage removal signal through the first connection cables corresponding to the first connection cables.

4. The control circuit of the AC switch according to claim 1, characterized in that: If the invalid potential of the opening signal, the invalid potential of the closing signal and the invalid signal of the undervoltage removal signal meet the unique trigger condition, the signal matching circuit includes: a second connecting cable and two second inverters; wherein: An input end of the trigger logic circuit receives the trip signal through the second connecting cable; The other two input terminals of the trigger logic circuit receive the closing signal and the undervoltage removal signal respectively through the second inverters corresponding to the respective ones.

5. The control circuit of the AC switch according to any one of claims 1 to 4, characterized in that: If the trigger logic circuit is triggered, the potential of the signal received by the input end of the first conversion circuit is the same as the effective potential of the signal for controlling the AC switch to perform a closing operation, then the first conversion circuit includes: a third connecting cable, or a third inverter and a fourth inverter; wherein: The output end of the trigger logic circuit is connected to the closing input end through the third connecting cable; or, The input end of the third inverter is connected to the output end of the trigger logic circuit, the output end of the third inverter is connected to the input end of the fourth inverter, and the output end of the fourth inverter is connected to the closing input end.

6. The control circuit of the AC switch according to any one of claims 1 to 4, characterized in that: If the trigger logic circuit is triggered, the potential of the signal received by the input end of the first conversion circuit is different from the effective potential of the signal controlling the AC switch to perform a closing operation, then the first conversion circuit includes: a fifth inverter; wherein: The output end of the trigger logic circuit is connected to the closing input end through the fifth inverter.

7. The control circuit of the AC switch according to any one of claims 1 to 4, characterized in that: Also includes: The second conversion circuit and the third conversion circuit; wherein: The opening input terminal of the AC switch receives the opening signal through the second conversion circuit; The undervoltage removal input terminal of the AC switch receives the undervoltage removal signal through the third conversion circuit.

8. The control circuit of the AC switch according to claim 7, characterized in that: For any conversion circuit of the second conversion circuit and the third conversion circuit, if the effective potential of the signal received at its input end is the same as the effective potential of the signal output at its output end, it includes: a fourth connecting cable; wherein: The corresponding input end of the AC switch receives the corresponding signal through the fourth connecting cable.

9. The control circuit of the AC switch according to claim 7, characterized in that: For any conversion circuit of the second conversion circuit and the third conversion circuit, if the effective potential of the signal received at its input end is different from the effective potential of the signal output at its output end, it includes: a sixth inverter; wherein: The corresponding input end of the AC switch receives the corresponding signal through the sixth inverter.

10. A power converter, characterized in that: include: A power conversion circuit, a controller, an AC switch, and a control circuit of the AC switch according to any one of claims 1 to 7; wherein: The first side of the power conversion circuit is connected to one end of the AC switch, and the first side of the power conversion circuit is the AC side; The power conversion circuit is controlled by the controller; The three output terminals of the controller respectively output an opening signal, a closing signal and an undervoltage relief signal to the control circuit of the AC switch.

11. The power converter according to claim 10, characterized in that: The AC switch includes a molded case circuit breaker.

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