JP2018077215A - Detection circuit and switch structure - Google Patents

Abstract

An object of the present invention is to provide a detection circuit and a switch structure including the detection circuit. A detection circuit is used to detect eddy current loss in an energy storage coil, and the detection circuit includes an oscillation circuit used to generate an oscillation signal based on an input excitation signal. Oscillating means configured to filter the oscillating signal, filter means used to obtain the filtered signal, and eddy current loss in the energy storage coil based on the filtered signal. Detecting means for detecting whether or not it exists. The structure of the detection circuit of the present application is simple and highly sensitive, and can accurately detect eddy current loss. [Selection] Figure 3

Description

  The present invention relates to the field of switches, and more particularly to a detection circuit and a switch structure.

  In industrial environments, switches are common components and are used to control the on or off of a circuit.

  FIG. 1 is a schematic diagram of the existing switch structure. FIG. 1A shows that the switch is in an off state, and FIG. 1B shows that the switch is in an on state. . As shown in FIG. 1A, the switch structure includes a switching button 101, an adjustment lever 102, and an elastic part 103. The switching button 101 is arranged on a circuit board 104, and a metal connection portion is provided at the bottom of the switching button 101. (Not shown) is provided, and the elastic component 103 is provided in the case 105 and is used to return the position of the adjustment lever 102.

  As shown in FIG. 1A, in a situation where the user F does not press the adjusting lever 102, the adjusting lever 102 does not press the switching button 101. Therefore, the circuit below the switching button 101 is not conducted. The switch is in the off state. As shown in FIG. 1B, under the situation where the user F pushes the adjustment lever 102, the adjustment lever 102 pushes the switching button 101, and the metal connection portion at the bottom of the switching button 101 is electrically connected to the circuit on the circuit board. This causes the switch to be in the on state.

  It should be noted that the introduction of the above technical background has been described in detail so that the technical solution of the present invention is clear and easy to provide a complete explanation, and is easily understood by those skilled in the art. These proposals are only described in detail in the background section of the present invention, and the above technical proposals cannot be recognized as being known to those skilled in the art.

  The inventor of the present application needs to provide a sealing structure between the adjustment lever 102 and the case 105 because the adjustment lever 102 penetrates the case 105 in the switch structure shown in FIG. It turns out that difficulty and cost increase. Further, it was found that the switch structure shown in FIG. 1 has complicated parts, a small volume, it is difficult to realize machine production, can only be assembled manually, and the manufacturing cost is high.

  Embodiments of the present invention provide a switch structure and a detection circuit. The switch structure of the present invention lowers the design requirements of each part of the switch structure, reduces the skill requirements of the operator during assembly, shortens the assembly time, is suitable for large-scale machine production, and removes the labor cost limitation It is an object.

  According to a first aspect of an embodiment of the present invention, a detection circuit used to detect eddy current loss in an energy storage coil, the oscillation used to generate an oscillation signal based on an input excitation signal Oscillating means comprising a circuit as the energy storage coil, filter means used to filter the oscillation signal and obtain a filtered signal, and the energy storage coil based on the filtered signal And a detecting means for detecting whether or not eddy current loss is present therein.

  According to a second aspect of the embodiment of the present invention, the oscillating means includes a first capacitor and a second capacitor in series, and the filter is connected to a connection point between the first capacitor and the second capacitor. The oscillation signal may be output to the means.

  According to a third aspect of the embodiment of the present invention, the oscillating means includes a third capacitor in series and a first resistor, and the filter means from the connection point of the energy storage coil and the first resistor. Alternatively, the oscillation signal may be output.

  According to a fourth aspect of an embodiment of the present invention, the filter means may include a low pass filter having a second resistor and a fourth capacitor.

  According to a fifth aspect of the embodiment of the present invention, the detection circuit further includes amplification means used to amplify the signal after being applied to the filter and to input the amplified signal to the detection means. But you can.

  According to a sixth aspect of the embodiment of the present invention, the detection circuit further includes voltage / current conversion means used to convert a pulse voltage into a pulse current input to the oscillation circuit as the excitation signal. But you can.

  According to a seventh aspect of the embodiment of the present invention, the detection circuit further comprises a diode means used to prevent the oscillation signal from flowing out to the oscillation circuit along a path opposite to the excitation signal. May be included.

  According to an eighth aspect of the embodiment of the present invention, the detection means determines whether eddy current loss exists in the energy storage coil based on one or N consecutive detection results, where N is The detection result may be an integer of 2 or more, and each detection result may correspond to each input excitation signal.

  According to a ninth aspect of the embodiment of the present invention, an energy storage coil, and the detection circuit according to the first to eighth aspects used for detecting an eddy current loss in the energy storage coil; A metal part capable of changing a distance from the energy storage coil, and in a situation where the distance between the metal part and the energy storage coil is changed to be in a first state, the detection circuit In a situation where a first detection signal is detected to detect the presence of eddy current loss in the storage coil, and the distance between the metal part and the energy storage coil is changed and in a second state, the detection circuit A switch structure is provided that outputs a second detection signal for detecting that there is no eddy current loss in the energy storage coil.

  According to a tenth aspect of an embodiment of the present invention, the switch structure is an operation used to change the distance between the metal part and the energy storage coil by receiving an external force to deform or move the metal part. A part may be further included.

  The beneficial effect of the present invention is that the design requirements of each part of the switch structure of this embodiment are low, the mounting difficulty is low, and it is suitable for large-scale machine production. The structure of the detection circuit of this embodiment is simple and highly sensitive, and can detect eddy current loss accurately.

  The following specification and drawings disclose in detail the specific implementations of the present invention and illustrate the schemes that can be employed in the principles of the present invention. It should be understood that the practice of the present invention is not limited in this scope. Within the spirit and scope of the appended claims, the practice of the invention includes many changes, amendments and equivalents.

  Implementation description and / or features shown may be used in one or more other implementations in the same or similar manner, combined with features in other implementations, or replaced with features in other implementations be able to.

  It should be emphasized that the term “include / include” as used herein refers to the presence of a feature, whole, process or component, but one or more other features, whole, process or composition. Does not exclude the presence or addition of elements.

  The accompanying drawings are used to provide a further understanding of the invention, which forms a part of the specification and illustrates the principles of the invention along with wordings, illustrating the manner in which the invention is implemented. Used for Of course, the drawings in the following description are only examples of the present invention, and other drawings can be obtained based on these drawings on the assumption that those skilled in the art do not pay creativity.

It is a schematic diagram of the existing switch structure. It is one schematic diagram of the switch structure of this-application Example 1. FIG. It is one schematic diagram of the detection circuit of this-application Example 2. FIG. It is another schematic diagram of the detection circuit of Example 2 of the present application. It is one schematic diagram of the oscillation signal of this-application Example 2. FIG. It is one schematic diagram of the signal Ui of this-application Example 2. FIG. It is one schematic diagram of the correspondence of the excitation signal of this application Example 2 and the signal Ui. It is one schematic diagram of the detection circuit of this-application Example 3.

  The foregoing specification and other features of the present invention will become apparent from the following specification with reference to the drawings. In the specification and drawings, specific implementations of the present invention are specifically disclosed and some implementations in which the principles of the invention may be employed are shown. It should be understood that the invention is not limited to the described implementations, but on the contrary, the invention includes all amendments, modifications and equivalents falling within the scope of the claims. In the description of the drawings, the same constituent elements are given the same numbers, and the repeated description is omitted.

Example 1
Embodiment 1 of the present invention provides a switch structure.

  FIG. 2 is a schematic diagram of a switch structure according to the first embodiment. As shown in FIG. 2A, the switch structure 200 includes an energy storage coil 201, a detection circuit (not shown), and a metal component 203.

  In the present embodiment, the energy storage coil 201 can flow an alternating electric signal to radiate an alternating magnetic field to the outside. The distance between the metal part 203 and the energy storage coil 201 can be changed. When the distance between the metal component 203 and the energy storage coil 201 is short, an alternating magnetic field radiated from the energy storage coil 201 generates an eddy current signal in the metal component 203, and the eddy current signal is an electric signal in the energy storage coil 201. Is accelerated and attenuated. That is, eddy current loss occurs in the energy storage coil 201. The detection circuit can detect eddy current loss in the energy storage coil 201.

  In this embodiment, the detection result of the detection circuit is related to the state of the switch structure 200. For example, when the distance between the metal component 203 and the energy storage coil 201 is changed and the switch structure 200 is in the first state, the detection circuit detects that eddy current loss exists in the energy storage coil 201. The detection signal can be output. In a situation where the distance between the metal part 203 and the energy storage coil 201 is changed and the switch structure 200 is in the second state, the detection circuit detects that there is no eddy current loss in the energy storage coil 201. The detection signal can be output.

  In this embodiment, the energy storage coil 201 is movable in order to determine whether the switch is on or off by detecting whether there is eddy current loss in the energy storage coil 201. There is no need to contact between the metal part and 203. Therefore, the design requirements of each part of the switch structure 200 are low, the mounting difficulty is low, and it is suitable for large-scale machine production.

  In this embodiment, the switch structure 200 shown in FIG. 2A is in the second state, and the second state is, for example, an off state. As shown in FIG. 2A, in the second state, the distance between the metal part 203 and the energy storage coil 201 is d1. The distance d1 is insufficient to cause eddy current loss in the energy storage coil 201. Thus, the detection circuit can output a second detection signal, which is used to indicate that the switch structure 200 is in the second state.

  The switch structure 200 shown in FIG. 2B is in a first state, and the first state is, for example, an on state. As shown in FIG. 2B, in the first state, the distance between the metal part 203 and the energy storage coil 201 is d2. d2 may be smaller than d1, which causes eddy current loss in the energy storage coil 201. Thus, the detection circuit can output a first detection signal, which is used to indicate that the switch structure 200 is in the first state.

  The description of the first state and the second state is merely an example, and the present embodiment is not limited to this. For example, based on the control logic of the first detection signal and the second detection signal, the first state corresponds to the off state of the switch structure 200, and the second state corresponds to the on state of the switch structure 200. You may let them.

  In this embodiment, the material of the metal part 203 may be a ferromagnetic material such as iron, or a non-ferromagnetic material such as copper. Since the selectable range of the material of the metal part 203 is wide, the degree of freedom in design increases.

  In the present embodiment, the shape of the metal part 203 may be a sheet shape, but the present embodiment is not limited to this, and may have other shapes.

  In the present embodiment, the metal part 203 may be deformed, and the distance from the energy storage coil 201 may be changed by the deformation. For example, as shown in FIGS. 2A and 2B, the metal part 203 has a sheet shape with an intermediate protrusion, and the metal protrusion 203 and the energy storage coil 201 are You may change the distance between. Alternatively, the metal part 203 may have other bent shapes, and the bent shape may be deformed by receiving an external force to change the distance between the metal part 203 and the energy storage coil 201.

  In the present embodiment, the metal part 203 may change the distance from the energy storage coil 201 by moving and moving without being deformed.

  In this embodiment, as shown in FIG. 2, the switch structure 200 may further include an operation unit 204. The operation unit 204 is used to change the distance between the metal part 203 and the energy storage coil 201 by receiving an external force to deform or move the metal part 203. For example, the operation unit 204 has a rod shape and is provided on the upper part of the metal part 203. Accordingly, when the operation unit 204 is pushed, the operation unit 204 can change the distance between the metal component 203 and the energy storage coil 201 by deforming the protruding portion in the middle of the metal component 203.

  In this embodiment, the switch structure 200 may further include an elastic part 2041, and the elastic part 2041 may be used to return the position of the operation unit 204.

  In the present embodiment, as shown in FIG. 2, the operation unit 204 and the metal part 203 may be provided in a case 205. For example, the case 205 may have a countersink 2051 on the surface opposite to the energy storage coil 201, and the operation unit 204 and the metal part 203 may be provided in the countersink 2051. Accordingly, there is no need to provide a through hole in the case 205, and there is no need to provide a sealing component between the operation unit 204 and the case 205, thereby further reducing the design difficulty and the manufacturing cost.

  In the present embodiment, the energy storage coil 201 may be provided on the circuit board 206. Accordingly, the energy storage coil 201 may be formed in the step of forming the wiring of the circuit board 206. Therefore, manufacturing cost and attachment difficulty can be reduced.

  Based on the switch structure 200 of the present embodiment, it is determined whether the switch is on or off by detecting whether there is eddy current loss in the energy storage coil 201. The energy storage coil 201 does not need to be in contact with the movable metal part 203. Therefore, the design requirements of each part of the switch structure 200 are low, the mounting difficulty is low, and it is suitable for large-scale machine production.

Example 2
In the second embodiment, the detection circuit of the first embodiment will be described.

  FIG. 3 is a schematic diagram of one detection circuit according to the second embodiment. As shown in FIG. 3, the detection circuit 300 is used to detect eddy current loss in the energy storage coil 201, and the detection circuit 300 includes an oscillation unit 301, a filter unit 302, and a detection unit 303.

  In this embodiment, the oscillation means 301 constitutes an energy storage coil 201 and an oscillation circuit, and the oscillation circuit is used to generate an oscillation signal based on the input excitation signal. The filter means 302 is used for filtering the oscillation signal and obtaining a signal after being filtered. The detecting means 303 detects whether or not there is an eddy current loss in the energy storage coil 201 based on the filtered signal.

  The structure of the detection circuit of this embodiment is simple and highly sensitive, can detect eddy current loss accurately, and does not require any special requirements for the material of the metal part 203 that causes eddy current loss.

  As needs to be explained, the detection circuit 300 described in the second embodiment is only used to detect whether or not there is an eddy current loss in the energy storage coil 201 of the switch structure 200 of the first embodiment. Instead, it can be used in other devices to detect whether eddy current losses exist in the energy storage coil.

  In this embodiment, as shown in FIG. 3, the oscillation means 301 may include a first capacitor C1 and a second capacitor C2 in series. In addition, an oscillation signal is output to the filter means 302 from the connection point between the first capacitor C1 and the second capacitor C2. For example, C1 = 270 pF and C2 = 270 pF.

  In this embodiment, the oscillation means 301 may further have other structures. FIG. 4 is another schematic diagram of the detection circuit of this embodiment. The difference between the detection circuit 300 shown in FIG. 4 and FIG. 3 is that the oscillation means 301 of FIG. 3 is replaced by the oscillation means 301a. In FIG. 4, the oscillation means 301a includes a third capacitor C3 and a first resistor R1 in series, and outputs an oscillation signal to the filter means 302 from the connection point between the energy storage coil 201 and the first resistor R1. For example, C3 = 470 pF and R1 = 10Ω.

  In the present embodiment, as shown in FIG. 3, the filter means 302 may include a low-pass filter circuit. The low-pass filter circuit may include, for example, a second resistor R2 and a fourth capacitor C4. For example, R2 = 47 kΩ and C4 = 220 pF.

  In the present embodiment, the detection means 303 may be a microprocessor or another circuit.

  As shown in FIG. 3, in this embodiment, the detection circuit 300 may further include an amplifying unit 304. The amplifying unit 304 is used to amplify the filtered signal and input the amplified signal to the detecting unit 303. Thereby, the detection means 303 can detect a more delicate change in the signal.

  As shown in FIG. 3, in this embodiment, the detection circuit 300 may further include a voltage / current conversion means 305. The voltage / current conversion means 305 is used to convert a pulse voltage into a pulse current, and the pulse current is input to the oscillation circuit as an excitation signal.

  As shown in FIG. 3, in this embodiment, the detection circuit 300 may further include diode means 306. The diode means 306 is used to prevent the oscillation signal from flowing into the oscillation circuit along a path opposite to the excitation signal.

  As shown in FIG. 3, in this embodiment, the detection circuit 300 may further include a third resistor R3. It may be used in parallel with the fourth capacitor C4 to discharge the fourth capacitor C4. For example, R3 = 100 kΩ.

  As shown in FIG. 3, the energy storage coil 201 may have an internal resistance R0. For example, R0 = 5Ω. Although not shown in FIG. 4, the energy storage coil 201 in FIG. 4 may also have an internal resistance R0.

  As shown in FIG. 3, in this embodiment, the pulse voltage input to the voltage / current conversion unit 305 may be generated by the detection unit 303. Thereby, the circuit structure can be further simplified.

  In this embodiment, each input excitation signal causes the detection means 303 to produce one corresponding detection result. The detection unit 303 may determine whether or not eddy current loss exists in the energy storage coil 201 based on one detection result. However, the present embodiment is not limited to this, and the detection unit 303 may determine whether or not there is an eddy current loss in the energy storage coil 201 based on consecutive N detection results. N is an integer greater than or equal to 2, and thereby a more accurate determination result can be obtained.

  It is necessary to explain that each means in FIGS. 3 and 4 may have other structures, and the present embodiment is not limited to the structure described in FIGS. 3 and 4.

  Hereinafter, the operation principle of the detection circuit of FIG. 3 will be described.

  In FIG. 3, the detection means 303 is a microprocessor. The pulse signal V output from the detection unit 303 is converted into a pulse current by the voltage / current conversion unit 305. The pulse current is input as an excitation signal to an oscillation circuit including the energy storage coil 201 and the oscillation means 301, whereby an oscillation signal is formed in the oscillation circuit.

  FIG. 5 is a schematic diagram of one of the oscillation signals. FIG. 5A is a waveform diagram of an oscillation current when there is no eddy current loss in the energy storage coil 201, and FIG. 5B is a case where eddy current loss exists in the energy storage coil 201. It is a waveform diagram of an oscillation current.

  The oscillation signal is output from between the capacitors C1 and C2, filtered through the resistor R2 of the filter means 302 and the capacitor C4, and the filtered signal Ui is obtained. FIG. 6 is a schematic diagram of one of the signals Ui after being filtered. 6A is a waveform diagram of the signal Ui when there is no eddy current loss in the energy storage coil, and FIG. 6B is a signal Ui when there is an eddy current loss in the energy storage coil. FIG. It can be seen that the attenuation width of the waveform of the signal Ui has a clear difference between (A) and (B) during 10 to 20 microseconds.

  The signal Ui is amplified by the amplifying unit 304 and input to the detecting unit 303 via impedance matching. The detecting unit 303 determines whether or not there is an eddy current loss in the energy storage coil 201 based on the input signal. To detect.

  FIG. 7 is a schematic diagram of a correspondence relationship between the excitation signal and the signal Ui. AA shows a waveform diagram of the excitation signal. BB is a waveform diagram of the signal Ui when there is no eddy current loss in the energy storage coil. CC is a waveform diagram of the signal Ui when eddy current loss exists in the energy storage coil. In this embodiment, the waveform diagram shown in BB or the waveform diagram shown in CC is input to the detection means 303 after amplification and impedance matching. The detection unit 303 may determine whether or not there is an eddy current loss in the energy storage coil 201 based on the detection result of one peak position in the waveform diagram. The detection unit 303 may determine whether or not there is an eddy current loss in the energy storage coil 201 based on the detection result of two or more continuous peak positions in the waveform diagram.

  The operation principle of the detection circuit of FIG. 4 is similar to that of FIG. 3, and this embodiment will not be described repeatedly.

Example 3
In the third embodiment, another structure of the detection circuit of the first embodiment will be described.

  FIG. 8 is a schematic diagram of one detection circuit according to the third embodiment. As shown in FIG. 8, the detection circuit 800 is used to detect eddy current loss in the energy storage coil 201. The detection circuit 800 includes an oscillation unit 801, a filter unit 802, a comparison unit 803, and a detection unit 804.

  As shown in FIG. 8, the oscillation means 801 constitutes an energy storage coil 201 and an oscillation circuit. Under the situation where there is no eddy current loss in the energy storage coil 201, the oscillation circuit is in an oscillation state, and the oscillation signal output from the point A is shown as a waveform of A-1. After the oscillation signal is filtered through the filter means 802, the signal output from the point B is shown as a waveform of B-1. The result after the signal output from the point B is compared with the comparison means 803 is output from the point C and is indicated as C-1. The point C outputs a high level signal, and the signal output from the point C is input to the detection means 804, and the detection means 804 detects that there is no eddy current loss.

  As shown in FIG. 8, under the situation where eddy current loss exists in the energy storage coil 201, the signal output from the point A is shown as a waveform of A-2 and includes only a DC bias signal. After the signal output from the point A is filtered through the filter means 802, the signal output from the point B is shown as a waveform of B-2 and becomes a low level signal. The result after the signal output from the point B is compared with the comparison means 803 is output from the point C and is indicated as C-2. The point C outputs a low level signal, the signal output from the point C is input to the detection means 804, and the detection means 804 detects that eddy current loss exists.

  Although the present invention has been described by combining specific implementation methods, it will be clear to those skilled in the art, and these descriptions are all typical and limit the protection scope of the present invention. It seems clear that it doesn't. Those skilled in the art can make various changes and corrections to the present invention based on the spirit and principle of the present invention, and these changes and corrections are also within the scope of the present invention.

  The present invention provides a switch structure and a detection circuit that have a simple structure, high sensitivity, and can accurately detect eddy current loss.

DESCRIPTION OF SYMBOLS 101: Switch button 102: Adjustment lever 103, 2041: Elastic component 104, 206: Circuit board 105, 205: Case 200: Switch structure 201: Energy storage coil 203: Metal component 204: Operation part 2051: Countersink 300: Detection circuit 301, 801: Oscillating means 302, 802: Filter means 303, 804: Detection means 304: Amplification means 305: Voltage / current conversion means 306: Diode means 803: Comparison means d1, d2: Distance C1: First capacitor C2: Second capacitor C3: Third capacitor C4: Fourth capacitor R0: Internal resistor R1: First resistor R2: Second resistor R3: Third resistor F: User Ui: Signal V: Pulse signal

Claims (10)

A detection circuit used to detect eddy current loss in an energy storage coil,
An oscillating means that constitutes an oscillation circuit used to generate an oscillation signal based on the input excitation signal with the energy storage coil;
Filtering means used to filter the oscillating signal and obtain a filtered signal;
Detecting means for detecting whether or not there is an eddy current loss in the energy storage coil based on the filtered signal.   The oscillating means includes a first capacitor and a second capacitor in series, and outputs the oscillation signal to the filter means from a connection point between the first capacitor and the second capacitor. The detection circuit according to claim 1.   The oscillation means includes a third capacitor and a first resistor in series, and outputs the oscillation signal to the filter means from a connection point between the energy storage coil and the first resistance. Item 2. The detection circuit according to Item 1.   The detection circuit according to claim 1, wherein the filter means includes a low-pass filter having a second resistor and a fourth capacitor.   2. The detection circuit according to claim 1, further comprising amplification means used to amplify the signal after being filtered and to input the amplified signal to the detection means.   2. The detection circuit according to claim 1, further comprising voltage / current conversion means used to convert a pulse voltage into a pulse current input to the oscillation circuit as the excitation signal.   2. The detection circuit according to claim 1, further comprising diode means used to prevent the oscillation signal from flowing into the oscillation circuit along a path opposite to the excitation signal.   The detection means determines whether or not eddy current loss exists in the energy storage coil based on one or N consecutive detection results, N is an integer of 2 or more, and each of the detection results 2. The detection circuit according to claim 1, wherein each corresponds to each of the inputted excitation signals. An energy storage coil;
The detection circuit according to any one of claims 1 to 8, which is used to detect eddy current loss in the energy storage coil;
A metal part capable of changing a distance from the energy storage coil,
In a situation where the distance between the metal part and the energy storage coil is changed to be in a first state, the detection circuit outputs a first detection signal for detecting the presence of eddy current loss in the energy storage coil. And
In a situation where the distance between the metal part and the energy storage coil is changed to be in a second state, the detection circuit detects a second detection signal for detecting that there is no eddy current loss in the energy storage coil. A switch structure characterized by output.   The switch structure according to claim 9, further comprising an operation unit used to change a distance between the metal part and the energy storage coil by deforming or moving the metal part in response to an external force.

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