Voltage switching control circuit and device

Abstract

The utility model provides a voltage switching control circuit and equipment. The voltage switching control circuit comprises an intermediate relay, a primary loop and a secondary loop, the input end of the primary loop is connected with a power supply, and the output end of the primary loop is connected with a load; a first end of the secondary loop is connected with a phase line of the primary loop, and a second end of the secondary loop is connected with a neutral line of the primary loop; a first contact group of the intermediate relay is connected in series with the primary loop, a second contact group of the intermediate relay is connected in series with the secondary loop, and the secondary loop and the intermediate relay are used for cooperatively controlling the wiring mode of the primary loop so as to control the voltage level provided by the power supply for the load. According to the voltage switching control circuit provided by the invention, voltage level switching can be simply and conveniently realized, and the flexibility of power supply is improved.

Description

Technical Field

[0001] The present application relates to the field of electrical switch technology, and in particular to a voltage switching control circuit and device. Background Art

[0002] With the development of the power system, in order to meet the normal use of various loads in the power system, the power supply needs to be able to provide 380V three-phase voltage and 220V single-phase voltage, and be able to switch between different voltage levels.

[0003] In the traditional voltage switching control technology, the connection method between the power supply and the load is manually adjusted according to the voltage level of the load to achieve voltage switching control.

[0004] However, conventional voltage switching control techniques have high operational complexity. Utility Model Content

[0005] Based on this, it is necessary to provide a voltage switching control circuit and device that is easy to operate in order to solve the above technical problems.

[0006] In a first aspect, the present application provides a voltage switching control circuit, comprising:

[0007] Intermediate relay, primary circuit and secondary circuit;

[0008] The input end of the primary circuit is used to connect to the power supply, and the output end of the primary circuit is used to connect to the load;

[0009] The first end of the secondary circuit is connected to the phase line of the primary circuit, and the second end of the secondary circuit is connected to the neutral line of the primary circuit;

[0010] The first contact group of the intermediate relay is connected in series with the primary circuit, and the second contact group of the intermediate relay is connected in series with the secondary circuit. The secondary circuit and the intermediate relay are used to coordinate the wiring method of the primary circuit to control the voltage level provided by the power supply to the load.

[0011] In one embodiment, the first contact group in the voltage switching control circuit provided includes: a first single-phase normally open contact and a first three-phase normally open contact, the first single-phase normally open contact is connected in series with the phase line, and the first three-phase normally open contact is connected in series with each phase line.

[0012] In one embodiment, the second contact group in the voltage switching control circuit provided includes: a second single-phase normally open contact and a second three-phase normally open contact, the second single-phase normally open contact is linked to the corresponding first single-phase normally open contact, and the second three-phase normally open contact is linked to the first three-phase normally open contact.

[0013] In one embodiment, the secondary loop in the voltage switching control circuit provided includes:

[0014] A switching control unit, wherein a first end of the switching control unit is connected to the phase line, and a second end of the switching control unit is connected to the neutral line;

[0015] A mode display unit, wherein a first end of the mode display unit is connected to the phase line, and a second end of the mode display unit is connected to the neutral line.

[0016] In one embodiment, a switching control unit in a voltage switching control circuit is provided, comprising:

[0017] A single-phase mode button, the single-phase mode button is connected to the second single-phase normally open contact;

[0018] Three-phase mode button, the three-phase mode button is connected to the second three-phase normally open contact.

[0019] In one embodiment, a mode display unit in a voltage switching control circuit is provided, comprising:

[0020] Single-phase indicator light, which is connected in series with the second single-phase normally open contact;

[0021] Three-phase indicator light, the three-phase indicator light is connected in series with the second three-phase normally open contact.

[0022] In one of the embodiments, the intermediate relay in the voltage switching control circuit provided further includes a reset normally open contact;

[0023] The secondary circuit in the provided voltage switching control circuit also includes:

[0024] A time-delay normally closed contact, wherein a first end of the time-delay normally closed contact is connected to a phase line of a primary circuit, and a second end of the time-delay normally closed contact is connected to a first end of a reset button;

[0025] A time delay relay, wherein a first end of the time delay relay is connected to a second end of the reset button, and a second end of the time delay relay is connected to a neutral line of the primary circuit;

[0026] The reset normally open contact is connected in parallel with the reset button.

[0027] In one of the embodiments, the primary circuit in the voltage switching control circuit provided further includes a circuit breaker;

[0028] The secondary circuit also includes a release, which is connected to the circuit breaker and is used to disconnect the circuit breaker when the release is turned on.

[0029] In one of the embodiments, the secondary circuit in the provided voltage switching control circuit also includes multiple circuit breaker normally closed contacts, one of the circuit breaker normally closed contacts is connected in series with a single-phase mode button, and one of the circuit breaker normally closed contacts is connected in series with a three-phase mode button.

[0030] In a second aspect, the present application provides a power switching device, including the voltage switching control circuit as in the first aspect, and the device further includes:

[0031] The wiring terminal is used to connect the power supply to the input end of the primary circuit in the voltage switching control circuit; the wiring terminal is also used to connect the output end of the primary circuit to the load;

[0032] The switch handle is connected to the circuit breaker and is used to control the closing or opening of the circuit breaker.

[0033] The above-mentioned voltage switching control circuit and equipment, the voltage switching control circuit includes: an intermediate relay, a primary circuit and a secondary circuit; the input end of the primary circuit is used to connect to the power supply, and the output end of the primary circuit is used to connect to the load; the first end of the secondary circuit is connected to the phase line of the primary circuit, and the second end of the secondary circuit is connected to the neutral line of the primary circuit; the first contact group of the intermediate relay is connected in series with the primary circuit, and the second contact group of the intermediate relay is connected in series with the secondary circuit, and the secondary circuit and the intermediate relay are used to cooperate to control the wiring method of the primary circuit to control the voltage level provided by the power supply to the load. In this application, the opening and closing state of each contact in the second contact group is controlled by cooperating with the secondary circuit and the intermediate relay, and the opening and closing state of each contact in the second contact group is used to affect the opening and closing state of each contact in the first contact group, thereby controlling the wiring method of the primary circuit to control the power supply to provide different voltage levels for the load, realize voltage level switching, and improve the flexibility of power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of the module structure of a voltage switching control circuit in one embodiment;

[0035] Figure 2 is a schematic structural diagram of a voltage switching control circuit in an embodiment;

[0036] Figure 3 Schematic diagram of the structure of a power switching device according to an embodiment. DETAILED DESCRIPTION

[0037] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0039] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0040] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0041] When used herein, the singular forms "a", "an" and " / the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0042] Figure 1 A schematic diagram of the module structure of a voltage switching control circuit in an embodiment of the present application is shown. Figure 2 FIG. 2 shows a schematic diagram of the structure of a voltage switching control circuit in an embodiment of the present application. Figure 1 and Figure 2 As shown, the voltage switching control circuit provided by an embodiment of the present application includes a primary circuit 100, a secondary circuit 200 and an intermediate relay 300; the input end of the primary circuit 100 is used to connect to a power supply, and the output end of the primary circuit 100 is used to connect to a load; the first end of the secondary circuit 200 is connected to the phase line of the primary circuit 100, and the second end of the secondary circuit 200 is connected to the neutral line of the primary circuit 100; the first contact group of the intermediate relay 300 is connected in series with the primary circuit 100, and the second contact group of the intermediate relay 300 is connected in series with the secondary circuit 200, and the secondary circuit 200 and the intermediate relay 300 are used to cooperate in controlling the wiring method of the primary circuit 100 to control the voltage level provided by the power supply to the load.

[0043] Among them, the power supply can provide a single-phase voltage signal of 220V and a three-phase voltage signal of 380V; the load includes single-phase electrical equipment with a voltage level of 220V and three-phase electrical equipment with a voltage level of 380V. When the power supply supplies power to the single-phase electrical equipment, the power supply is connected to the input end of the single-phase electrical equipment through a phase line and a neutral line in the primary circuit 100; when the power supply supplies power to the three-phase electrical equipment, the power supply is connected to the input end of the three-phase electrical equipment through three phase lines and a neutral line in the primary circuit 100.

[0044] The three phase lines of the primary circuit 100 can be respectively recorded as phase A, phase B and phase C, that is, Figure 1 The cables marked as A, B and C in the figure, the neutral line of the primary circuit 100 can be marked as N line, that is, Figure 1 The cable marked N in the figure.

[0045] The phase line connected to the first end of the secondary circuit 200 is any one of the A phase line, the B phase line or the C phase line. In a possible implementation, the first end of the secondary circuit 200 is connected to the C phase line of the primary circuit 100, and the second end of the secondary circuit 200 is connected to the N line of the primary circuit 100.

[0046] The intermediate relay 300 includes an electromagnetic coil and a plurality of contacts. When the electromagnetic coil is energized, a magnetic field is generated to cause the contacts to move, thereby realizing the on-off of the circuit. The normally open contacts in the intermediate relay 300 mentioned in the present application, such as the first single-phase normally open contact and the first three-phase normally open contact, are contacts that remain in an open state when not energized and switch to a closed state after energization; the normally closed contacts in the intermediate relay 300 are contacts that remain in a closed state when not energized and switch to an open state after energization.

[0047] In a possible implementation, the first contact group of the intermediate relay 300 includes: a first single-phase normally open contact and a first three-phase normally open contact, the first single-phase normally open contact is connected in series with the phase line, and the first three-phase normally open contact is connected in series with each phase line.

[0048] Among them, the number of the first single-phase normally open contacts is consistent with the number of phase lines, and the three first single-phase normally open contacts are respectively recorded as KMa1, KMb1 and KMc1. The first single-phase normally open contacts are respectively connected in series with the three phase lines in the primary circuit 100, that is, the first single-phase normally open contact KMa1 is connected in series with the A phase line, the first single-phase normally open contact KMb1 is connected in series with the B phase line, and the first single-phase normally open contact KMc1 is connected in series with the C phase line. The first three-phase normally open contact K1 includes three sub-contacts, which are respectively connected in series with the A phase line, the B phase line and the C phase line.

[0049] The closed states of the first single-phase normally open contacts KMa1, KMb1, KMc1 and the first three-phase normally open contact K1 are mutually exclusive, that is, only one contact can be closed at the same time, and the other contacts are in the open state.

[0050] Exemplarily, the first single-phase normally open contact KMa1 is closed, the first single-phase normally open contacts KMb1, KMc1 and the first three-phase normally open contact K1 are all open, the A phase line and the N phase line are conductive, and the B phase line and the C phase line are disconnected, then the power supply can provide a 220V voltage to the load. Another exemplary embodiment, the first three-phase normally open contact K1 is closed, the first single-phase normally open contacts KMa1, KMb1, KMc1 are all open, the A phase line, the B phase line, the C phase line and the N phase line are all conductive, then the power supply can provide a 380V voltage to the load.

[0051] In one possible implementation, the second contact group of the intermediate relay 300 includes: a second single-phase normally open contact and a second three-phase normally open contact, the second single-phase normally open contact is linked to the corresponding first single-phase normally open contact, and the second three-phase normally open contact is linked to the first three-phase normally open contact.

[0052] Among them, the number of the second single-phase normally open contacts is consistent with the number of the first single-phase normally open contacts, and the three second single-phase normally open contacts are respectively recorded as KMa2, KMb2 and KMc2, and one second three-phase normally open contact can be recorded as K2. The second single-phase normally open contact KMa2 corresponds to the first single-phase normally open contact KMa1, the second single-phase normally open contact KMb2 corresponds to the first single-phase normally open contact KMb1, and the second single-phase normally open contact KMc2 corresponds to the first single-phase normally open contact KMc1.

[0053] The state linkage between the contacts refers to the same open and closed states of the corresponding contacts. For example, when the second single-phase normally open contact is switched to the closed state, the first single-phase normally open contact corresponding to the second single-phase normally open contact is also switched to the closed state; when the second single-phase normally open contact is switched to the open state, the first single-phase normally open contact corresponding to the second single-phase normally open contact is also switched to the open state; when the second three-phase normally open contact K2 is switched to the closed state, the first three-phase normally open contact K1 is also switched to the closed state.

[0054] The voltage switching control circuit includes: an intermediate relay 300, a primary circuit 100 and a secondary circuit 200; the input end of the primary circuit 100 is used to connect to the power supply, and the output end of the primary circuit 100 is used to connect to the load; the first end of the secondary circuit 200 is connected to the phase line of the primary circuit 100, and the second end of the secondary circuit 200 is connected to the neutral line of the primary circuit 100; the first contact group of the intermediate relay 300 is connected in series with the primary circuit 100, and the second contact group of the intermediate relay 300 is connected in series with the secondary circuit 200, and the secondary circuit 200 and the intermediate relay 300 are used to cooperate to control the wiring mode of the primary circuit 100 to control the voltage level provided by the power supply to the load. In this embodiment, the opening and closing state of each contact in the second contact group is controlled by the cooperation of the secondary circuit 200 and the intermediate relay 300, and the opening and closing state of each contact in the second contact group is used to affect the opening and closing state of each contact in the first contact group, thereby controlling the wiring mode of the primary circuit 100, so as to control the power supply to provide different voltage levels for the load, realize voltage level switching, and improve the flexibility of power supply.

[0055] Continue reading Figure 2 The secondary circuit 200 in the voltage switching control circuit provided in one embodiment of the present application includes: a switching control unit, a first end of the switching control unit is connected to the phase line, and a second end of the switching control unit is connected to the neutral line; a mode display unit, a first end of the mode display unit is connected to the phase line, and a second end of the mode display unit is connected to the neutral line.

[0056] In a possible implementation, the switching control unit includes: a single-phase mode button connected to the second single-phase normally open contact; and a three-phase mode button connected to the second three-phase normally open contact.

[0057] The switching control unit includes one three-phase mode button and multiple single-phase mode buttons. The number of the single-phase mode buttons is consistent with the number of phase lines in the primary circuit 100, so that the wiring of the primary circuit 100 can be controlled by the single-phase mode buttons. Figure 2 As shown, the three-phase mode button can be recorded as SB1, there are 3 single-phase mode buttons, which can be recorded as SB2, SB3, and SB4 respectively, and the single-phase mode button is connected to the second single-phase normally open contact accordingly.

[0058] Exemplarily, the three-phase mode button SB1 corresponds to the function of providing a three-phase voltage signal to the load. The three-phase mode button SB1 corresponds to the second three-phase normally open contact K2. During the power supply process, pressing the three-phase mode button SB1 will drive the second three-phase normally open contact K2 to close, and then drive the first three-phase normally open contact K1 to close. The A phase line, B phase line, C phase line and N line are all turned on, so that the power supply provides a 380V level voltage signal to the load.

[0059] As another example, the single-phase mode button SB2 corresponds to the function of providing a single-phase voltage signal from the A phase line to the load, corresponding to the second single-phase normally open contact KMa2; the single-phase mode button SB3 corresponds to the function of providing a single-phase voltage signal from the B phase line to the load, corresponding to the second single-phase normally open contact KMb2; the single-phase mode button SB4 corresponds to the function of providing a single-phase voltage signal from the C phase line to the load, corresponding to the second single-phase normally open contact KMc2. During the power supply process, if the single-phase mode button SB2 is pressed, the second single-phase normally open contact KMa2 is closed, and then the first single-phase normally open contact KMa1 is closed, the A phase line and the N line are turned on, and the power supply provides a 220V voltage signal to the load.

[0060] In a possible implementation, the mode display unit includes: a single-phase indicator light connected in series with the second single-phase normally open contact; and a three-phase indicator light connected in series with the second three-phase normally open contact.

[0061] Among them, the mode display unit is connected in parallel with the switching control unit. A single-phase indicator light is connected in series with a second single-phase normally open contact, and the single-phase analog display branches formed by the single-phase indicator lights and the second single-phase normally open contact are connected in series in parallel with each other, and are connected in parallel with the three-phase analog display branch formed by the three-phase indicator lights and the second three-phase normally open contact K2 in series. The first end of each analog display branch is connected to a phase line in the primary circuit 100, and the second end of each analog display branch is connected to the neutral line in the primary circuit 100. Exemplarily, if the power supply needs to provide a voltage signal of 380V level to the load, the second three-phase normally open contact K2 is closed, the three-phase analog display branch is turned on, and the three-phase indicator light is illuminated. Another exemplary example, if the power supply needs to provide a voltage signal of 220V level to the load, one of the second single-phase normally open contacts KMa2, KMb2 or KMc2 is closed, the single-phase analog display branch corresponding to the closed second single-phase normally open contact is turned on, and the single-phase indicator light in the single-phase analog display branch is illuminated.

[0062] Optionally, each single-phase indicator light and three-phase indicator light are distinguished by color. Exemplarily, the single-phase indicator light and the three-phase indicator light can be LED lights or halogen lights. Exemplarily, the three-phase indicator light can be a white indicator light WD; the single-phase indicator light corresponding to the second single-phase normally open contact KMa2 can be a yellow indicator light YD; the single-phase indicator light corresponding to the second single-phase normally open contact KMb2 can be a green indicator light GD; the single-phase indicator light corresponding to the second single-phase normally open contact KMc2 can be a red indicator light RD.

[0063] In this embodiment, based on the single-phase mode button and the three-phase mode button in the switching control unit, external pressing information is received, and the opening and closing state of the second single-phase normally open contact or the second three-phase normally open contact is controlled according to the external pressing information, thereby affecting the opening and closing state of the corresponding first single-phase normally open contact or the first three-phase normally open contact in the primary circuit 100, thereby controlling the wiring mode of the primary circuit 100, and indicating the current power supply mode with an indicator light. In this way, external users only need to perform a pressing operation to realize power supply of different voltage levels to the load, reducing the complexity of voltage switching control.

[0064] Continue reading Figure 2 The intermediate relay 300 in the voltage switching control circuit provided in one embodiment of the present application also includes a reset normally open contact KM; the secondary circuit 200 also includes: a delayed normally closed contact KT, a first end of the delayed normally closed contact KT is connected to the phase line of the primary circuit 100, and a second end of the delayed normally closed contact KT is connected to a first end of a reset button SB; a delay relay KT', a first end of the delay relay KT' is connected to a second end of the reset button SB, and a second end of the delay relay KT' is connected to a neutral line of the primary circuit; the reset normally open contact KM is connected in parallel with the reset button SB.

[0065] In a possible implementation manner, the primary circuit 100 further includes a circuit breaker QF'; the secondary circuit 200 further includes a tripping device TC, and the tripping device TC is connected to the circuit breaker QF' and is used to disconnect the circuit breaker QF' when the tripping device TC is turned on.

[0066] The circuit breaker QF' includes three sub-contacts, which are respectively connected in series with the A phase line, the B phase line and the C phase line, and the first end of each sub-contact of the circuit breaker QF' is respectively connected with the A phase line, the B phase line and the C phase line on the power supply side, and the second end of each sub-contact is respectively connected with the first end of the three sub-contacts of the first three-phase normally open contact K1. When the circuit breaker QF' is switched to the disconnected state, the primary circuit 100 is disconnected.

[0067] The reset process includes: pressing the reset button SB, and the reset button SB controls the reset normally open contact KM to switch from the open state to the closed state, and the release TC, reset relay coil KM' and delay relay KT' in the secondary circuit 200 are turned on. The release TC controls the circuit breaker QF' to disconnect, the primary circuit 100 is disconnected, and the power supply and the load are disconnected; the delay relay KT' controls the delay normally closed contact KT to switch from the closed state to the open state, the secondary circuit 200 is disconnected, the indicator light in the mode display unit goes out, the normally open contact returns to the open state, and the normally closed contact returns to the closed state, that is, a reset is completed.

[0068] In a possible implementation, the secondary circuit 200 also includes a fuse FU, a first end of the fuse FU is connected to a phase line in the primary circuit 100, and a second end of the fuse is connected to a first end of a delayed normally closed contact KT. If the current input into the secondary circuit 200 exceeds the fusing current of the fuse, the fuse overheats and melts, cutting off the power supply and the secondary circuit 200, thereby preventing the large current from damaging the components in the secondary circuit 200.

[0069] In a possible implementation manner, the secondary circuit 200 further includes a plurality of circuit breaker normally closed contacts QF, wherein one circuit breaker normally closed contact QF is connected in series with a single-phase mode button, and one circuit breaker normally closed contact QF is connected in series with a three-phase mode button.

[0070] The normally closed contact QF of the circuit breaker is in a closed state when no power is supplied, and is in an open state when the circuit breaker QF' is closed.

[0071] Optionally, the secondary circuit 200 includes one three-phase modular-controlled branch and three single-phase modular-controlled branches, wherein: the three-phase modular-controlled branch is the branch where the three-phase mode button SB1 is located, and in the three-phase modular-controlled branch, the three-phase mode button SB1 is connected in series with a normally closed contact QF of a circuit breaker; the three single-phase modular-controlled branches are the branches where the single-phase mode buttons SB2, SB3 and SB4 are located, and in each single-phase modular-controlled branch, the single-phase mode button SB2, SB3 or SB4 is connected in series with a normally closed contact QF of a circuit breaker. If the circuit breaker QF' is closed, the circuit breaker normally closed contact QF is opened, the three-phase modular controlled branch and each single-phase modular controlled branch are disconnected, and pressing the three-phase mode button or the single-phase mode button is invalid, which can avoid closing the contacts in the intermediate relay 300 when the load is connected, causing damage to the intermediate relay 300; if the circuit breaker QF' is in the disconnected state, the circuit breaker normally closed contact QF is closed, pressing the three-phase mode button SB1 or the single-phase mode button closes the corresponding second three-phase normally open contact K2 or the second The single-phase normally open contact, the corresponding three-phase modular-controlled branch or single-phase modular-controlled branch can be turned on, driving the corresponding first three-phase normally open contact K1 or the first single-phase normally open contact in the primary circuit 100 to close, the corresponding three-phase modular display branch or the single-phase modular display branch in the mode display unit is turned on, and the corresponding three-phase indicator light or the single-phase indicator light is illuminated; at this time, the circuit breaker QF' is closed, the primary circuit 100 supplies power to the load, and the circuit breaker normally closed contact QF is opened. At this time, pressing the three-phase mode button or the single-phase mode button is invalid.

[0072] In a possible implementation, the intermediate relay 300 further includes a three-phase normally closed contact K2' and single-phase normally closed contacts KMa2', KMb2' and KMc2'. On the three-phase modular control branch, the three-phase mode button SB1, the circuit breaker normally closed contact QF, the single-phase normally closed contacts KMa2', KMb2' and KMc2' are connected in series; on the single-phase modular control branch corresponding to the A phase line, the single-phase mode button SB2, the circuit breaker normally closed contact QF, the three-phase normally closed contacts K2', single-phase normally closed contact KMb2' and KMc2' are connected in series; on the single-phase analog-controlled branch corresponding to the B phase line, the single-phase mode button SB3, the circuit breaker normally closed contact QF, the three-phase normally closed contact K2', the single-phase normally closed contact KMa2' and KMc2' are connected in series; on the single-phase analog-controlled branch corresponding to the C phase line, the single-phase mode button SB4, the circuit breaker normally closed contact QF, the three-phase normally closed contact K2', the single-phase normally closed contact KMa2' and KMb2' are connected in series.

[0073] Exemplarily, during the power supply process, the three-phase mode button SB1 is pressed, the second three-phase normally open contact K2 is closed, and the first three-phase normally open contact K1 and the three-phase normally closed contact K2' are closed accordingly, and the single-phase normally closed contacts KMa2', KMb2' and KMc2' on the three-phase modular control branch are opened, and the corresponding second single-phase normally open contacts KMa2, KMb2 and KMc2 are opened accordingly, and the corresponding first single-phase normally open contacts KMa1, KMb1, KMc1 are opened accordingly, realizing three-phase power supply, and the contacts corresponding to each mode are mutually exclusive. During the three-phase power supply, other buttons are invalid to prevent accidental touch.

[0074] As another example, when the single-phase mode button SB2 is pressed, the second single-phase normally open contact KMa2 is closed, and the first single-phase normally open contact KMa1 and the single-phase normally closed contact KMa2' are closed accordingly, and the single-phase normally closed contacts KMb2' and KMc2' and the three-phase normally closed contact K2' on the single-phase modular control branch are opened, and the corresponding second single-phase normally open contacts KMb2 and KMc2 and the second three-phase normally open contact K2 are opened accordingly, and the corresponding first single-phase normally open contacts KMb1 and KMc1 and the first three-phase normally open contact K1 are opened accordingly, thereby realizing single-phase power supply through the A phase line.

[0075] In this embodiment, the coordination of the states of the normally closed contact QF of the circuit breaker and the circuit breaker QF' can prevent the circuit breaker QF' from closing prematurely, resulting in damage to the circuit breaker QF' due to the opening and closing of the circuit breaker when a load is connected. It can also prevent the three-phase mode button SB1 or the single-phase mode button from being operated incorrectly during the power supply process, resulting in damage to the intermediate relay 300 due to the opening and closing contacts when a load is connected, thereby improving the safety and reliability of the voltage switching control circuit.

[0076] Figure 3A power switching device provided in an embodiment of the present application is shown, including the voltage switching control circuit provided in the above embodiment, and the device also includes: a wiring terminal 400, the wiring terminal 400 is used to connect the power supply to the input end of the primary circuit 100 in the voltage switching control circuit; the wiring terminal 400 is also used to connect the output end of the primary circuit 100 to the load; a switch handle 500, connected to the circuit breaker, for controlling the closing or opening of the circuit breaker.

[0077] The connection terminal 400 includes a first connection terminal and a second connection terminal, the first connection terminal is connected to the power supply and the input terminal of the primary circuit 100, and the second connection terminal is connected to the output terminal of the primary circuit 100 and the input terminal of the load. Figure 3 In the power switching device shown, the hexagon marked with A, B, C, and N at the top is the first wiring terminal; the hexagon marked with A, B, C, and N at the bottom is the second wiring terminal.

[0078] Among them, the initial state of the switch handle 500 corresponds to the situation where the circuit breaker QF' is disconnected, and the primary circuit 100 is disconnected. In the initial state of the power switching device, the normally open contacts, such as the first single-phase normally open contacts KMa1, KMb1, KMc1, the first three-phase normally open contact K1, the second three-phase normally open contact K2, the second single-phase normally open contact KMa2, KMb2, KMc2 and the reset normally open contact KM are in the open state; the normally closed contacts, such as the three-phase normally closed contact K2', the single-phase normally closed contacts KMa2', KMb2', KMc2', the circuit breaker normally closed contact QF and the delayed normally closed contact KT are in the closed state, and the switch handle 500 is in the initial state. Press the reset button SB, and the power switching device returns to the initial state.

[0079] Among them, the reset button SB, three-phase mode button SB1, single-phase mode buttons SB2, SB3, SB4, single-phase indicator light, three-phase indicator light, connection terminal 400 and switch handle 500 can be set on the outer surface of the power switching device for external staff to operate and observe.

[0080] In a possible implementation, the power switching device further includes a Bluetooth module, a Wifi module or an infrared module for receiving an external command signal, controlling the state of the switch handle according to the external command signal, and further controlling the voltage signal switching.

[0081] In a possible implementation, the switch handle is an up and down toggle switch, the upper position or the lower position is the initial state, and the other position is the switching state; in a possible implementation, the switch handle is a rotary switch, the clockwise position or the counterclockwise position is the initial state, and the other position is the switching state.

[0082] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0083] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0084] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A voltage switching control circuit, characterized in that: The voltage switching control circuit comprises: Intermediate relay, primary circuit and secondary circuit; The input end of the primary circuit is used to be connected to a power source, and the output end of the primary circuit is used to be connected to a load; The first end of the secondary circuit is connected to the phase line of the primary circuit, and the second end of the secondary circuit is connected to the neutral line of the primary circuit; The first contact group of the intermediate relay is connected in series with the primary circuit, and the second contact group of the intermediate relay is connected in series with the secondary circuit. The secondary circuit and the intermediate relay are used to cooperate in controlling the wiring mode of the primary circuit to control the voltage level provided by the power supply to the load.

2. The voltage switching control circuit according to claim 1, characterized in that: The first contact group includes: a first single-phase normally open contact and a first three-phase normally open contact, the first single-phase normally open contact is connected in series with the phase line, and the first three-phase normally open contact is connected in series with each of the phase lines.

3. The voltage switching control circuit according to claim 2, characterized in that: The second contact group includes: a second single-phase normally open contact and a second three-phase normally open contact, the second single-phase normally open contact is linked to the corresponding first single-phase normally open contact, and the second three-phase normally open contact is linked to the first three-phase normally open contact.

4. The voltage switching control circuit according to claim 3, characterized in that: The secondary circuit comprises: A switching control unit, wherein a first end of the switching control unit is connected to the phase line, and a second end of the switching control unit is connected to the neutral line; A mode display unit, wherein a first end of the mode display unit is connected to the phase line, and a second end of the mode display unit is connected to the neutral line.

5. The voltage switching control circuit according to claim 4, characterized in that: The switching control unit comprises: a single-phase mode button, wherein the single-phase mode button is connected to the second single-phase normally open contact; A three-phase mode button is connected to the second three-phase normally open contacts.

6. The voltage switching control circuit according to claim 4, characterized in that: The mode display unit comprises: A single-phase indicator light, the single-phase indicator light being connected in series with the second single-phase normally open contact; A three-phase indicator light, wherein the three-phase indicator light is connected in series with the second three-phase normally open contact.

7. The voltage switching control circuit according to claim 3, characterized in that: The intermediate relay also includes a reset normally open contact; The secondary circuit also includes: A time-delay normally closed contact, wherein a first end of the time-delay normally closed contact is connected to the phase line of the primary circuit, and a second end of the time-delay normally closed contact is connected to a first end of a reset button; A time delay relay, wherein a first end of the time delay relay is connected to a second end of the reset button, and a second end of the time delay relay is connected to the neutral line of the primary circuit; The reset normally open contact is connected in parallel with the reset button.

8. The voltage switching control circuit according to claim 7, characterized in that: The primary circuit also includes a circuit breaker; The secondary circuit also includes a release, which is connected to the circuit breaker and is used to disconnect the circuit breaker when the release is turned on.

9. The voltage switching control circuit according to claim 5, characterized in that: The secondary circuit also includes a plurality of circuit breaker normally closed contacts, wherein one of the circuit breaker normally closed contacts is connected in series with one of the single-phase mode buttons, and one of the circuit breaker normally closed contacts is connected in series with one of the three-phase mode buttons.

10. A power switching device, characterized in that: The device comprises a voltage switching control circuit according to any one of claims 1 to 9, and further comprises: A wiring terminal, the wiring terminal is used to connect the power supply to the input end of the primary circuit in the voltage switching control circuit; the wiring terminal is also used to connect the output end of the primary circuit to the load; The switch handle is connected to the circuit breaker and is used to control the circuit breaker to close or open.

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