CN211630156U - Switching circuit and electronic device - Google Patents
Switching circuit and electronic device Download PDFInfo
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- CN211630156U CN211630156U CN202020475393.2U CN202020475393U CN211630156U CN 211630156 U CN211630156 U CN 211630156U CN 202020475393 U CN202020475393 U CN 202020475393U CN 211630156 U CN211630156 U CN 211630156U
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Abstract
The utility model provides a switch circuit and electronic equipment, the switch circuit comprises a voltage division circuit, a switch tube and a normally closed switch; the first end of the voltage division circuit is connected with the power supply, the second end of the voltage division circuit is connected with the system chip, and the third end of the voltage division circuit is connected with the first end of the switch tube; the second end of switch tube is connected with bleeder circuit's first end, and the first end of normally closed switch is still connected to the second end of switch tube, and the second end of normally closed switch is connected to the third end of switch tube, and the second end ground connection of normally closed switch. When the switch circuit is connected with the power supply, because the normally closed switch is in a closed state in a normal state, no voltage difference exists between adjacent metal contacts in the normally closed switch, and the phenomenon of electric leakage is avoided.
Description
Technical Field
The utility model relates to the technical field of circuits, especially, relate to a switch circuit and electronic equipment.
Background
Currently, most electronic devices, such as televisions and display screens, need to be configured with an independent switch circuit for implementing the power-on or standby functions of the electronic devices.
When the electronic equipment is in a humid environment, the voltage difference between the metal contacts easily causes the key switch to have a leakage phenomenon, so that the equipment is damaged.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a switching circuit and an electronic device, which solve the technical problem of the current switching circuit that leaks electricity easily in a humid environment.
In order to achieve the above object, the present invention provides a switching circuit and an electronic device, wherein the switching circuit includes a voltage dividing circuit, a switching tube and a normally closed switch;
the first end of the voltage division circuit is connected with a power supply, the second end of the voltage division circuit is connected with the system chip, and the third end of the voltage division circuit is connected with the first end of the switch tube;
the second end of the switch tube is connected with the first end of the voltage division circuit, the second end of the switch tube is also connected with the first end of the normally closed switch, the third end of the switch tube is connected with the second end of the normally closed switch, and the second end of the normally closed switch is grounded;
the switch tube is used for being cut off when the normally closed switch is in a closed state and being conducted when the normally closed switch is in an open state, so that the power supply supplies power to the system chip through the voltage division circuit.
Optionally, the voltage dividing circuit includes a first resistor and a second resistor connected in series;
the first end of the first resistor is connected with a power supply, the second end of the first resistor is connected with the first end of the second resistor, and the second end of the first resistor and the first end of the second resistor are both connected to the system chip;
the second end of the second resistor is connected with the first end of the switch tube.
Optionally, the switching circuit further comprises a protection circuit;
the first end of the protection circuit is connected with the first end of the voltage division circuit, and the second end of the protection circuit is connected with the second end of the switch tube.
Optionally, the protection circuit comprises a third resistor;
the first end of the third resistor is connected with the first end of the voltage division circuit, and the second end of the third resistor is connected with the second end of the switch tube.
Optionally, the switching tube is a triode;
the collector electrode of triode is connected bleeder circuit's third end, the base of triode is connected bleeder circuit's first end, the base of triode still is connected normally closed switch's first end, the projecting pole of triode is connected normally closed switch's second end.
Optionally, the transistor is an NPN transistor.
Further, to achieve the above object, the present invention also provides an electronic device including a switching circuit configured as the switching circuit described above.
The utility model provides a switch circuit and electronic equipment, the switch circuit comprises a voltage division circuit, a switch tube and a normally closed switch; the first end of the voltage division circuit is connected with the power supply, the second end of the voltage division circuit is connected with the system chip, and the third end of the voltage division circuit is connected with the first end of the switch tube; the second end of the switch tube is connected with the first end of the voltage division circuit, the second end of the switch tube is also connected with the first end of the normally closed switch, the third end of the switch tube is connected with the second end of the normally closed switch, and the second end of the normally closed switch is grounded; the switch tube is used for being cut off when the normally closed switch is in a closed state and being conducted when the normally closed switch is in an open state, so that the power supply supplies power to the system chip through the voltage division circuit.
The utility model discloses be provided with bleeder circuit, switch tube and normally closed switch, when the switch circuit connects the power, because normally closed switch is in the closure state under the normal state, there is not the voltage difference in the inside adjacent metal contact of normally closed switch, avoids the production of switch circuit electric leakage phenomenon. Meanwhile, the switch tube is cut off when the normally closed switch is in a normal state, and the control system chip receives a high-voltage signal; the switch tube is conducted when the normally closed switch is in a working state, the low-voltage signal is received through the voltage division circuit control system chip, and normal work of the switch circuit is guaranteed through the mode.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of an embodiment of the switching circuit of the present invention;
fig. 2 is a schematic diagram of a specific circuit structure in an embodiment of the switching circuit of the present invention.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | Voltage divider circuit | R2 | |
| 20 | Switch tube | R3 | |
| 30 | Protective circuit | K1 | Normally closed switch |
| R1 | A first resistor | Q1 | Triode transistor |
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic circuit diagram of a switch circuit according to an embodiment of the present invention. The switch circuit comprises a voltage division circuit 10, a switch tube 20 and a normally closed switch K1; the first end of the voltage division circuit 10 is connected with a power supply, the second end of the voltage division circuit 10 is connected with a system chip, and the third end of the voltage division circuit 10 is connected with the first end of the switch tube 20; the second end of the switch tube 20 is connected to the first end of the voltage divider circuit 10, the second end of the switch tube 20 is further connected to the first end of the normally closed switch K1, the third end of the switch tube 20 is connected to the second end of the normally closed switch K1, and the second end of the normally closed switch K1 is grounded.
In the present embodiment, a normally closed switch K1 is provided, and it is easily understood that the normally closed switch K1 means that a metal contact inside the switch is in a closed state in the absence of an external force. Generally, the switch is internally composed of two metal contacts which are embedded in a substrate and fixed to the substrate to form two ends of the switch. When the switch is subjected to external pressure, namely a user presses a switch button, the two metal contacts are contacted, and the switch is in a conducting state. However, in the interior of the normally closed switch K1, the two metal contacts are initially in a contact state, and when the switch is subjected to external pressure, i.e., when a user presses a switch button, the two metal contacts are opened and the switch is in an open state.
In this embodiment, the whole of the voltage dividing circuit 10, the switching tube 20 and the normally closed switch K1 is used as a switching circuit, the first end of the voltage dividing circuit 10 is used as the input end of the switching circuit and is connected to the power supply, the second end of the voltage dividing circuit 10 is used as the output end of the switching circuit and is connected to the system chip, as a preferable scheme, the voltage output by the power supply is 3.3V, when the normally closed switch K1 is not subjected to external pressure, the normally closed switch K1 is in a conducting state, the switching tube 20 is turned off, the voltage dividing circuit 10 is turned off, the voltage output by the power supply is directly output to the system chip, and the system chip receives a high voltage signal of 3.3; when the normally closed switch K1 is subjected to external pressure, that is, when a user presses the normally closed switch K1, the normally closed switch K1 is in an off state, the switching tube 20 is turned on, the voltage dividing circuit 10 divides the power output voltage, and the system chip receives a low voltage signal after voltage division. Preferably, the high voltage signal is set as an inactive signal, and the low voltage signal is set as an enable signal. When the system chip receives the high-voltage signal, the system chip is still in a standby state; and when the system chip receives the low-voltage signal, the system chip is controlled to work.
The embodiment is provided with the voltage division circuit 10, the switch tube 20 and the normally closed switch K1, and when the switch circuit is connected with a power supply, because the normally closed switch K1 is in a closed state under a normal state, no voltage difference exists between adjacent metal contacts inside the normally closed switch K1, and the generation of the switch circuit leakage phenomenon is avoided. Meanwhile, the switch tube 20 is cut off when the normally closed switch K1 is in a normal state, and the control system chip receives a high-voltage signal; the switch tube 20 is conducted when the normally closed switch K1 is in a working state, and the voltage division circuit 10 controls the system chip to receive a low voltage signal, so that the normal operation of the switch circuit is ensured.
Further, please refer to fig. 2, fig. 2 is a schematic circuit diagram of an embodiment of the switch circuit of the present invention. The voltage divider circuit 10 comprises a first resistor R1 and a second resistor R2 connected in series; the first end of the first resistor R1 is connected with a power supply, the second end is connected with the first end of the second resistor R2, and the second end of the first resistor R1 and the first end of the second resistor R2 are both connected with the system chip; the second end of the second resistor R2 is connected to the first end of the switch tube 20.
In this embodiment, the voltage dividing circuit 10 is composed of a first resistor R1 and a second resistor R2, and it is easily understood that specific resistance values of the first resistor R1 and the second resistor R2 may be specifically set according to actual operation conditions of the switch circuit, and the embodiment is not limited thereto. When a user presses the normally closed switch K1, the switch tube 20 is turned on, the voltage dividing circuit 10 divides the power output voltage, and outputs a divided low-voltage signal to the system chip; when the user does not press the normally closed switch K1, the voltage divider circuit 10 does not divide the voltage of the power output, so that when the user presses the normally closed switch K1, the system chip receives a low voltage signal divided by the voltage divider circuit 10, and when the user does not press the normally closed switch K1, the system chip receives a high voltage signal not divided by the voltage divider circuit 10, so that the voltage divider circuit 10 is arranged to enable the switch circuit to output different voltage signals to the system chip according to the operation of the user. It should be understood that the voltage dividing circuit 10 in the present embodiment may also be formed by other component configurations, and the present embodiment is not limited in particular herein.
Further, with continued reference to fig. 2, the switch circuit further includes a protection circuit 30; a first terminal of the protection circuit 30 is connected to the power supply, and a second terminal of the protection circuit 30 is connected to the second terminal of the switching tube 20. The protection circuit 30 includes a third resistor R3; the first end of the third resistor R3 is connected to the first end of the voltage divider 10, and the second end of the third resistor R3 is connected to the second end of the switch tube 20.
In the present embodiment, a protection circuit 30 is further provided, as an alternative, the protection circuit 30 is composed of a third resistor R3, the voltage output by the power supply flows through the third resistor R3 and outputs to the switch tube 20, and in particular, the third resistor R3 is a current-limiting resistor, and functions to protect the switch tube 20 by dividing the voltage output by the power supply. It should be understood that the protection circuit 30 of the present embodiment may also be composed of other components, and only one preferred embodiment is illustrated herein.
Further, the switching tube 20 is a transistor Q1; the collector of the transistor Q1 is connected to the third terminal of the voltage divider 10, the base of the transistor Q1 is connected (or connected through the protection circuit 30) to the first terminal of the voltage divider 10, the base of the transistor Q1 is also connected to the first terminal of the normally closed switch K1, and the emitter of the transistor Q1 is connected to the second terminal of the normally closed switch K1.
In this embodiment, the switch tube 20 may be configured as an NPN transistor Q1. When the normally closed switch K1 is in a normal state, namely a closed state, the voltage of two poles of a base electrode and an emitting electrode of the triode Q1 is 0V, and the triode Q1 is cut off; when the normally-closed switch K1 is under a conducting state due to an external force, the power output voltage is output to the base of the transistor Q1 through the third resistor R3, and the transistor Q1 is turned on. By the mode, the cut-off and the conduction of the triode Q1 are controlled, and the normal work of the switch circuit is further ensured.
Further, the utility model discloses still protect an electronic equipment, this electronic equipment includes switch circuit, and above-mentioned embodiment can be referred to this switch circuit's structure, and no longer the repeated description here. It should be understood that, since the electronic device of the present embodiment adopts the technical solution of the switch circuit, the electronic device has all the advantages of the switch circuit.
The above is only the optional embodiment of the present invention, and not therefore the scope of the present invention is limited, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.
Claims (7)
1. A switch circuit is characterized by comprising a voltage division circuit, a switch tube and a normally closed switch;
the first end of the voltage division circuit is connected with a power supply, the second end of the voltage division circuit is connected with the system chip, and the third end of the voltage division circuit is connected with the first end of the switch tube;
the second end of the switch tube is connected with the first end of the voltage division circuit, the second end of the switch tube is also connected with the first end of the normally closed switch, the third end of the switch tube is connected with the second end of the normally closed switch, and the second end of the normally closed switch is grounded;
the switch tube is used for being cut off when the normally closed switch is in a closed state and being conducted when the normally closed switch is in an open state, so that the power supply supplies power to the system chip through the voltage division circuit.
2. The switching circuit according to claim 1, wherein the voltage dividing circuit includes a first resistor and a second resistor connected in series;
the first end of the first resistor is connected with a power supply, the second end of the first resistor is connected with the first end of the second resistor, and the second end of the first resistor and the first end of the second resistor are both connected to the system chip;
the second end of the second resistor is connected with the first end of the switch tube.
3. The switching circuit of claim 1, wherein the switching circuit further comprises a protection circuit;
the first end of the protection circuit is connected with the first end of the voltage division circuit, and the second end of the protection circuit is connected with the second end of the switch tube.
4. The switching circuit of claim 3, wherein the protection circuit comprises a third resistor;
the first end of the third resistor is connected with the first end of the voltage division circuit, and the second end of the third resistor is connected with the second end of the switch tube.
5. The switching circuit according to claim 1, wherein the switching tube is a transistor;
the collector electrode of triode is connected bleeder circuit's third end, the base of triode is connected bleeder circuit's first end, the base of triode still is connected normally closed switch's first end, the projecting pole of triode is connected normally closed switch's second end.
6. The switching circuit according to claim 5, wherein the transistor is an NPN transistor.
7. An electronic device, characterized in that the electronic device comprises a switching circuit according to any one of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020475393.2U CN211630156U (en) | 2020-04-02 | 2020-04-02 | Switching circuit and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020475393.2U CN211630156U (en) | 2020-04-02 | 2020-04-02 | Switching circuit and electronic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211630156U true CN211630156U (en) | 2020-10-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020475393.2U Active CN211630156U (en) | 2020-04-02 | 2020-04-02 | Switching circuit and electronic device |
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|---|---|
| CN (1) | CN211630156U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112947660A (en) * | 2021-02-20 | 2021-06-11 | 上海韦玏微电子有限公司 | Preprocessing circuit and preprocessing method for power supply voltage |
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2020
- 2020-04-02 CN CN202020475393.2U patent/CN211630156U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112947660A (en) * | 2021-02-20 | 2021-06-11 | 上海韦玏微电子有限公司 | Preprocessing circuit and preprocessing method for power supply voltage |
| CN112947660B (en) * | 2021-02-20 | 2024-03-19 | 上海韦玏微电子有限公司 | Pretreatment circuit and pretreatment method for power supply voltage |
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