CN110911193A - Mechanical switch circuit structure and setting method - Google Patents
Mechanical switch circuit structure and setting method Download PDFInfo
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- CN110911193A CN110911193A CN201911066478.3A CN201911066478A CN110911193A CN 110911193 A CN110911193 A CN 110911193A CN 201911066478 A CN201911066478 A CN 201911066478A CN 110911193 A CN110911193 A CN 110911193A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
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Abstract
The invention discloses a mechanical switch circuit structure, wherein the mechanical switch circuit structure comprises a mechanical switch, a power supply circuit and a power supply circuit, wherein the mechanical switch comprises an output contact, a power supply contact and a grounding contact; the first self-locking unit is arranged between the power supply input end and the power supply output end; the second self-locking unit is arranged between the power supply input end and the power supply grounding end; when the power supply contact is conducted with the output contact, the second self-locking unit starts a conducting state, the first self-locking unit starts a conducting state, and the output of the first self-locking unit is at a low level; when the power supply contact and the output contact are in an open circuit state, the output contact is conducted with the grounding contact, the output of the first self-locking unit is in a high level, and the second self-locking unit is opened to maintain a conducting state. The invention also discloses a setting method of the mechanical switch circuit. The mechanical switch circuit structure and the setting method provided by the invention can ensure the normal operation of the circuit under the condition of poor contact of the mechanical switch.
Description
Technical Field
The invention relates to the field of circuit structures, in particular to a mechanical switch circuit structure and a setting method.
Background
In the prior art, mechanical switches have the advantages of simple structure, low price, low heat productivity and the like, so the mechanical switches are widely applied to various circuit structures. However, mechanical switching devices have considerable disadvantages compared to semiconductor switching devices, for example, mechanical devices are prone to wear and metal fatigue, since any mechanical device needs to be moved continuously to perform the corresponding work. Meanwhile, since the mechanical switching device is directly exposed to the air, oxidation of metal elements in the mechanical switching device may occur and contact failure of the mechanical switching device may be caused. If the mechanical switch device has poor contact, the adverse effect can be generated on the normal operation of the equipment, and the user experience of using the mechanical switch product is further influenced.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a mechanical switch circuit structure which can ensure the normal operation of a circuit under the condition of poor contact of a mechanical switch.
The invention also provides a setting method of the mechanical switch circuit.
According to a mechanical switch circuit structure of an embodiment of the first aspect of the present invention, comprising:
the mechanical switch comprises an output contact, a power supply contact and a grounding contact;
the first self-locking unit is arranged between the power supply input end and the power supply output end;
the second self-locking unit is arranged between the power supply input end and the power supply grounding end;
when the power supply contact is conducted with the output contact, the second self-locking unit starts a conducting state, and the first self-locking unit starts a conducting state;
when the power supply contact and the output contact are in an open circuit state, the output contact is conducted with the grounding contact, the second self-locking unit is in a cut-off state, and the first self-locking unit is in a cut-off state.
The mechanical switch circuit structure provided by the embodiment of the invention at least has the following beneficial effects: the normal operation of the circuit can be ensured under the condition of poor contact of the mechanical switch.
According to some embodiments of the invention, the second self-locking unit comprises a first end, a second end, a third end;
the first end is electrically connected with the power input end, the second end is electrically connected with the power output end, and the third end is connected with the power grounding end.
The first self-locking unit comprises a first end, a second end and a third end;
the first end of the first self-locking unit is electrically connected with the power input end, the second end of the first self-locking unit is electrically connected with the power input end, and the third end of the first self-locking unit is connected with the output contact;
and a first current limiting resistor is arranged between the first end of the first self-locking unit and the second end of the first self-locking unit.
And an equivalent capacitor is arranged between the power input end and the power output end. The equivalent capacitor is arranged to be used for disconnecting the self-locking circuit.
A first self-recovery fuse is arranged between the third end of the first self-locking unit and the output contact;
and a second self-recovery fuse is arranged between the output contact and the power output end.
Through setting up first self recovery fuse, second self recovery fuse to when having overcurrent in the assurance circuit, the resistance value that can increase the setting in the circuit, and then restricts the electric current to in the circuit.
A second current limiting resistor is arranged between the second end of the first self-locking unit and the first end of the second self-locking unit;
a fourth current limiting resistor is arranged between the power supply output end and the second end of the second self-locking unit;
and a third current-limiting resistor is arranged between the second end of the second self-locking unit and the power ground terminal.
According to a second aspect of the invention, the method for setting the mechanical switch circuit comprises the following steps:
arranging a mechanical switch which comprises an output contact, a power supply contact and a grounding contact;
a first self-locking unit is arranged between the power supply input end and the power supply output end;
a second self-locking unit is arranged between the power supply input end and the power supply grounding end;
when the power supply contact is conducted with the output contact, the second self-locking unit starts a conducting state, and the first self-locking unit starts a conducting state;
when the power supply contact and the output contact are in an open circuit state, the output contact is conducted with the grounding contact, the second self-locking unit is in a cut-off state, and the first self-locking unit is in a cut-off state.
The second self-locking unit comprises a first end, a second end and a third end;
and the first end is electrically connected with a power input end, the second end is electrically connected with a power output end, and the third end is connected with a power grounding end.
The first self-locking unit comprises a first end, a second end and a third end;
a first end of the first self-locking unit is electrically connected with a power input end, a second end of the first self-locking unit is electrically connected with the power input end, and a third end of the first self-locking unit is connected with an output contact;
and a first current limiting resistor is arranged between the first end of the first self-locking unit and the second end of the first self-locking unit.
A first self-recovery fuse is arranged between the third end of the first self-locking unit and the output contact;
and a second self-recovery fuse is arranged between the output contact and the power output end.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a mechanical switch circuit structure according to an embodiment of the present invention.
The reference numbers illustrate: s1, a mechanical switch; 31. an output contact; 32. a power supply contact; 33. a ground contact; 10. a first self-locking unit; 20. a second self-locking unit; r1, a first current limiting resistor; r2 and a second current limiting resistor; r3 and a third current limiting resistor; r4 and a fourth current limiting resistor; f1, first self-healing fuse; f2, second self-healing fuse; c1, and the equivalent capacitance of the rear-stage circuit.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1, fig. 1 is a schematic structural diagram illustrating a circuit structure of a mechanical switch S1 according to an embodiment of the present invention. As shown, the circuit structure of the mechanical switch S1 includes:
a mechanical switch S1 including an output contact 31, a power contact 32, and a ground contact 33;
the first self-locking unit 10 is arranged between the power supply input end and the power supply output end, and the first self-locking unit 10 is arranged between the power supply input end and the power supply output end;
the second self-locking unit 20, the second self-locking unit 20 is set up between power input end, power ground terminal;
when the power contact 32 is conducted with the output contact 31, the second self-locking unit 20 starts a conducting state, and starts the first self-locking unit 10 to start a conducting state;
when the power supply contact and the output contact are in an open circuit state, the output contact is conducted with the grounding contact, the second self-locking unit is in a cut-off state, and the first self-locking unit is in a cut-off state.
The second self-locking unit 20 comprises a first end 21, a second end 22 and a third end 23;
the first terminal 21 is electrically connected to the power input terminal, the second terminal 22 is electrically connected to the power output terminal, and the third terminal 23 is connected to the power ground terminal.
The first self-locking unit 10 comprises a first end 11, a second end 12 and a third end 12;
the first end 11 of the first self-locking unit 10 is electrically connected with the power input end, the second end 12 of the first self-locking unit 10 is electrically connected with the power input end, and the third end 13 of the first self-locking unit 10 is connected with the output contact 31;
a first current limiting resistor R1 is disposed between the first end 11 of the first self-locking unit 10 and the second end 12 of the first self-locking unit 10. And a post-stage circuit equivalent capacitor is arranged between the power supply output end and the power supply grounding end.
A first self-recovery fuse F1 is arranged between the third end 13 of the first self-locking unit 10 and the output contact 31; a second self-healing fuse F2 is provided between the output contact 31 and the power supply output. A second current limiting resistor R2 is arranged between the second end 12 of the first self-locking unit 10 and the first end 21 of the second self-locking unit 20; a fourth current limiting resistor R4 is arranged between the power output end and the second end 22 of the second self-locking unit 20; the third end 23 of the second self-locking unit 20 is electrically connected to the power ground, and a third current limiting resistor R3 is disposed between the second end 22 of the second self-locking unit 20 and the power ground.
The ground terminal to which the ground contact 33 is connected may be the same ground terminal as the power supply ground terminal and may be adaptively adjusted according to a specific circuit configuration.
The above embodiments will be described in detail below with specific electronic components as examples.
The first self-locking unit 10 specifically includes a field effect transistor and a parasitic diode connected to the field effect transistor, and the second self-locking unit 20 specifically is a triode. When the output contact 31 of the mechanical switch S1 is conducted to the power contact 32, the source signal is inputted from the power input terminal and is inputted to the second self-healing fuse F2. When the source signal is transmitted to the transistor through the second self-healing fuse F2, since the second self-healing fuse F2 is electrically connected to the second terminal (base) of the transistor, the source signal (high level) is transmitted to the second terminal (base) of the transistor, and the second terminal (base) of the transistor is high level, so the transistor is in a conducting state, that is, the first terminal (collector) of the transistor is conducted to the third terminal (emitter) of the transistor.
When the transistor is turned on, the power input terminal inputs a source signal, and the source signal may be output to the power ground terminal via the first current-limiting resistor R1, the second current-limiting resistor R2, and the first terminal (collector) and the third terminal (emitter) of the transistor. At this time, the second end (grid) of the field effect transistor is at low level, so that the field effect transistor is in a conduction state, namely the first end (source) of the field effect transistor is conducted with the third end (drain) of the field effect transistor. When the fet is in a conducting state, part of the source signal is output to the first self-recovery fuse F1, the second self-recovery fuse F2, the second terminal (base) of the transistor via the fet and is output to the power output terminal.
The ground terminal to which the ground contact 33 is connected may be the same ground terminal as the power supply ground terminal and may be adaptively adjusted according to a specific circuit configuration.
Under normal working condition, if the resistance of the field effect transistor is RQ1The resistance of the first self-recovery fuse F1 is RF1The mechanical switch S1 has a resistance value of RS1Then R isS1<RQ1+RF1. The current through the fet, the first self-healing fuse F1 is therefore less than the current through the mechanical switch S1.
Under the abnormal working state, the mechanical switch S1 has the resistance value of R due to poor contact of the mechanical switch S1S1Increase, then RS1>RQ1+RF1. Therefore, the current flowing through the fet and the first self-healing fuse F1 increases rapidly, and the source signal is continuously output to the power output terminal, thereby performing the function of freewheeling. At the same time, the source signal passes through the field effectThe first self-healing fuse F1 is output to the second terminal (base) of the transistor to maintain the transistor in the on state. That is, when the mechanical switch S1 is in poor contact, the fet and the transistor can still maintain their operating states, and the source signal is output to the power output terminal through the fet and is output to the second terminal (base) of the transistor to maintain the transistor in an on state. When the triode is in the on state, the second end (grid) of the field effect transistor keeps the low level all the time so as to maintain the on state of the field effect transistor. Namely, a self-locking circuit is established through the connection design of a field effect tube and a triode.
When the self-locking circuit needs to be disconnected, the power contact 32 and the output contact 31 in the mechanical switch S1 are opened, and the grounding contact 33 and the output contact 31 are conducted, so that the equivalent capacitor C1 of the rear-stage circuit quickly discharges to the ground, the second end (base) of the triode is grounded, the collector and the emitter of the triode are in an open circuit state, and the first end (source) and the third end (drain) of the field-effect tube are in an open circuit state, so that the self-locking circuit is disconnected.
When the self-locking circuit is disconnected to the moment that the grounding contact 33 and the output contact 31 are conducted, a source signal input by the power input end is output to the grounding end through the field effect transistor, the first self-recovery fuse F1 and the mechanical switch S1, a loop resistor formed by the field effect transistor and the mechanical switch S1 is small in resistance value, large loop current can be generated, and the field effect transistor can be damaged because the loop current is higher than rated peak current of the field effect transistor. Therefore, the first self-recovery fuse F1 is arranged between the fet and the mechanical switch S1 to prevent the loop current from being too large, thereby protecting the fet. The first self-healing fuse F1 works as follows: when the loop current is too large, the temperature of the first self-recovery fuse F1 is rapidly increased, the internal resistance is increased, so as to reduce the loop current, thereby avoiding the damage of the field effect transistor, and meanwhile, after the equivalent capacitor C1 of the later stage circuit finishes discharging, no current flows into the second end (base electrode) of the triode, the triode is disconnected, the field effect transistor is disconnected, and the loop can be cut off. By arranging the first self-recovery fuse F1, the situation that the subsequent circuit cannot be powered off and the power input end is short-circuited when the mechanical switch S1 outputs to the ground end due to the fact that the field of the first self-recovery fuse F1 is broken down and damaged by the effect tube can also be avoided.
In other embodiments, the first self-healing fuse F1 and the second self-healing fuse F2 may be replaced with other fuse-type devices to protect the protection circuit in different environments.
The field effect transistor and the triode in the above embodiments can be replaced by different semiconductor switching devices, such as a thyristor.
The field effect transistor and the triode in the above embodiments can be replaced by different semiconductor switching devices, such as a thyristor.
The embodiment of the invention also provides a setting method of the mechanical switch S1 circuit, which comprises the following steps
A mechanical switch S1 is arranged, and comprises an output contact 31, a power supply contact 32 and a grounding contact 33;
a first self-locking unit 10 is arranged between the power supply input end and the power supply output end;
a second self-locking unit 20 is arranged between the power supply input end and the power supply grounding end;
when the power contact 32 is conducted with the output contact 31, the second self-locking unit 20 starts a conducting state, and starts the first self-locking unit 10 to start a conducting state;
when the power contact 32 and the output contact 31 are in an open state, and the output contact 31 and the ground contact 33 are conducted, the second self-locking unit 20 is in a cut-off state, and the first self-locking unit 10 is in a cut-off state.
The second self-locking unit 20 comprises a first end 21, a second end 22 and a third end 23;
the first terminal 21 is electrically connected to the power input terminal, the second terminal 22 is electrically connected to the power output terminal, and the third terminal 23 is connected to the power ground terminal.
The first self-locking unit 10 comprises a first end 11, a second end 12 and a third end 13;
a first end 11 of the first self-locking unit 10 is electrically connected with a power input end, a second end 12 of the first self-locking unit 10 is electrically connected with the power input end, and a third end 13 of the first self-locking unit 10 is connected with an output contact 31;
a first current limiting resistor R1 is arranged between the first end 11 of the first self-locking unit 10 and the second end 12 of the first self-locking unit 10.
A first self-recovery fuse F1 is arranged between the third end 13 of the first self-locking unit 10 and the output contact 31;
a second self-healing fuse F2 is provided between the output contact 31 and the power supply output.
Referring to fig. 1 again, the first self-locking unit 10 includes a fet and a parasitic diode of the fet, and the second self-locking unit 20 is a triode. When the output contact 31 of the mechanical switch S1 is conducted to the power contact 32, the source signal is inputted from the power input terminal and is inputted to the second self-healing fuse F2. When the source signal is transmitted to the transistor through the second self-healing fuse F2, since the second self-healing fuse F2 is electrically connected to the second terminal (base) of the transistor, the source signal (high level) is transmitted to the second terminal (base) of the transistor, and the second terminal (base) of the transistor is high level, so the transistor is in a conducting state, that is, the first terminal (collector) of the transistor is conducted to the third terminal (emitter) of the transistor.
When the transistor is turned on, the power input terminal inputs a source signal, and the source signal may be output to the power ground terminal via the first current-limiting resistor R1, the second current-limiting resistor R2, and the first terminal (collector) and the third terminal (emitter) of the transistor. At this time, the second end (grid) of the field effect transistor is at low level, so that the field effect transistor is in a conduction state, namely the first end (source) of the field effect transistor is conducted with the third end (drain) of the field effect transistor. When the fet is in a conducting state, part of the source signal is output to the first self-recovery fuse F1, the second self-recovery fuse F2, the second terminal (base) of the transistor via the fet and is output to the power output terminal.
Under normal working condition, if the resistance of the field effect transistor is RQ1The resistance of the first self-recovery fuse F1 is RF1The mechanical switch S1 has a resistance value of RS1Then R isS1<RQ1+RF1. Therefore, the current flowing through the fet, the first self-healing fuse F1 is smaller than the current flowing through the mechanical switch S1.
Under the abnormal working state, the mechanical switch S1 has the resistance value of R due to poor contact of the mechanical switch S1S1Increase, then RS1>RQ1+RF1. Therefore, the current flowing through the fet and the first self-healing fuse F1 increases rapidly, and the source signal is continuously output to the power output terminal, thereby performing the function of freewheeling. Meanwhile, the source signal is output to the second terminal (base) of the triode through the fet and the first self-healing fuse F1 to maintain the triode in the on state. That is, when the mechanical switch S1 is in poor contact, the fet and the transistor can still maintain their operating states, and the source signal is output to the power output terminal through the fet and is output to the second terminal (base) of the transistor to maintain the transistor in an on state. When the triode is in the on state, the second end (grid) of the field effect transistor keeps the low level all the time so as to maintain the on state of the field effect transistor. Namely, a self-locking circuit is established through the connection design of a field effect tube and a triode.
In other embodiments, the first and second self-healing fuses F1 and F2 may be replaced with other fuses to protect the protection circuit in different environments.
The field effect transistor and the triode in the above embodiments can be replaced by different semiconductor switching devices, such as a thyristor.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. A mechanical switch circuit structure, comprising:
the mechanical switch comprises an output contact, a power supply contact and a grounding contact;
the first self-locking unit is arranged between the power supply input end and the power supply output end;
the second self-locking unit is arranged between the power supply input end and the power supply grounding end;
when the power supply contact is conducted with the output contact, the second self-locking unit starts a conducting state, and the first self-locking unit starts a conducting state;
when the power supply contact and the output contact are in an open circuit state, the output contact is conducted with the grounding contact, the second self-locking unit is in a cut-off state, and the first self-locking unit is in a cut-off state.
2. The mechanical switching circuit structure of claim 1, wherein the second latching unit comprises a first end, a second end, a third end;
the first end is electrically connected with the power input end, the second end is electrically connected with the power output end, and the third end is connected with the power grounding end.
3. The mechanical switching circuit structure of claim 2, wherein the first latching unit comprises a first end, a second end, a third end;
the first end of the first self-locking unit is electrically connected with the power input end, the second end of the first self-locking unit is electrically connected with the power input end, and the third end of the first self-locking unit is connected with the output contact;
and a first current limiting resistor is arranged between the first end of the first self-locking unit and the second end of the first self-locking unit.
4. A mechanical switch circuit structure as claimed in any one of claims 1 to 3, wherein a post-circuit equivalent capacitor is provided between the power supply output terminal and the power supply ground terminal.
5. The mechanical switch circuit structure of claim 4, wherein a first self-restoring fuse is arranged between the third end of the first self-locking unit and the output contact;
and a second self-recovery fuse is arranged between the output contact and the power output end.
6. The mechanical switch circuit structure according to claim 5, wherein a second current limiting resistor is disposed between the second end of the first self-locking unit and the first end of the second self-locking unit;
a fourth current limiting resistor is arranged between the power supply output end and the second end of the second self-locking unit;
and a third current-limiting resistor is arranged between the second end of the second self-locking unit and the power ground terminal.
7. A method of setting a mechanical switching circuit, comprising:
arranging a mechanical switch which comprises an output contact, a power supply contact and a grounding contact;
a first self-locking unit is arranged between the power supply input end and the power supply output end;
a second self-locking unit is arranged between the power supply input end and the power supply grounding end;
when the power supply contact is conducted with the output contact, the second self-locking unit starts a conducting state, and the first self-locking unit starts a conducting state;
when the power supply contact and the output contact are in an open circuit state, the output contact is conducted with the grounding contact, the second self-locking unit is in a cut-off state, and the first self-locking unit is in a cut-off state.
8. The method of claim 7, wherein the second latching unit comprises a first end, a second end, and a third end;
and the first end is electrically connected with a power input end, the second end is electrically connected with a power output end, and the third end is connected with a power grounding end.
9. The mechanical switching circuit structure of claim 8, wherein the first latching unit comprises a first end, a second end, a third end;
a first end of the first self-locking unit is electrically connected with a power input end, a second end of the first self-locking unit is electrically connected with the power input end, and a third end of the first self-locking unit is connected with an output contact;
and a first current limiting resistor is arranged between the first end of the first self-locking unit and the second end of the first self-locking unit.
10. The mechanical switching circuit structure according to claim 9, wherein a first self-restoring fuse is provided between the third terminal of the first self-locking unit and the output contact;
and a second self-recovery fuse is arranged between the output contact and the power output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911066478.3A CN110911193A (en) | 2019-11-04 | 2019-11-04 | Mechanical switch circuit structure and setting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911066478.3A CN110911193A (en) | 2019-11-04 | 2019-11-04 | Mechanical switch circuit structure and setting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110911193A true CN110911193A (en) | 2020-03-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911066478.3A Pending CN110911193A (en) | 2019-11-04 | 2019-11-04 | Mechanical switch circuit structure and setting method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110911193A (en) |
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2019
- 2019-11-04 CN CN201911066478.3A patent/CN110911193A/en active Pending
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