Single-contact switch and safety switch circuit for realizing multi-wire system by single-contact switch

Abstract

The utility model relates to the field of single-contact switch circuits, in particular to a single-contact switch and a multi-wire system safety switch circuit realized by the single-contact switch, which comprise a single-contact switch circuit, a chip controller and a power supply unit, the single-contact switch circuit comprises a first signal wire, a second signal wire, a transistor and a single-contact physical switch, the first signal line and the second signal line are connected with the chip controller and the transistor, an existing multi-contact switch is replaced by a single-contact physical switch, the single-contact physical switch is provided with the transistor, the transistor is provided with three pins, the single-contact physical switch is connected with the transistor in parallel, and the first signal line and the second signal line are connected with the transistor in series. No matter in a high-level state or a low-level state, the circuit can ensure that the voltage change of the signal line is accurate and reliable, and the key service life of the single-contact physical switch is longer than that of a multi-contact switch, so that the service life of the whole single-contact switch circuit is prolonged, and the use is more convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to single touch point switch circuit field especially is single touch point switch and single touch point switch realizes the safety switch circuit of many line system. BACKGROUND

[0002] The most basic function of switch circuit is to control the on-off of current. By switching the state of the switch in the circuit, precise control of current flow can be achieved, thereby protecting other components in the circuit from excessive current or short circuit. In complex electronic systems, signals may need to be transmitted between multiple paths. Switching circuits can select the transmission path of signals as needed to achieve signal switching and distribution. This is particularly important for signal processing, communication and control systems. In power management, by controlling the on-off of the power supply, the power supply management of electronic devices such as standby, hibernate, wake-up, etc. can be achieved. It can also be used as part of a protection circuit to cut off the power supply when the circuit is overloaded, short-circuited or faulty, to prevent circuit damage or fire accidents.

[0003] Safety switch circuit usually adopts three-wire system design. When the touch point switch is pressed and released, different circuit paths are connected or disconnected, respectively, so that the single touch point switch circuit outputs different logic signals, thereby realizing the switching of the circuit state.

[0004] In the existing safety switch circuit, the touch point physical switch is a multi-touch point physical switch, such as Figure 1 As described above, the multi-touch point physical switch has a short service life and cannot meet the high requirements of industrial products for the service life and safety of physical switches. Once the physical switch is damaged, it is easy to cause a power supply short circuit. UTILITY MODEL CONTENTS

[0005] In order to overcome the shortcomings of the prior art, the utility model provides a single touch point switch and a safety switch circuit for realizing a multi-wire system with a single touch point switch, which can effectively solve the technical problem of easy damage of multi-touch point switches leading to a power supply short circuit.

[0006] The utility model solves the technical problems by adopting the following technical scheme:

[0007] The single touch point switch comprises a single touch point physical switch, a first signal line, a second signal line and a transistor. The transistor comprises three pins. The first signal line and the second signal line are respectively connected in series with any two of the three pins. The first signal line or the second signal line is connected in series with a resistor. A third pin of two pins other than the two pins connected in series with the first signal line and the second signal line among the three pins is connected to ground or a positive power supply voltage. The first signal line and the second signal line are also connected to ground or a positive power supply voltage. The first signal line and the second signal line can both generate a level control signal. The single touch point physical switch is connected in parallel with any two of the three pins of the transistor.

[0008] When one pin of the transistor is connected to ground, the first signal line and the second signal line are connected to the positive power supply voltage;

[0009] When one pin of the transistor is connected to the positive power supply voltage, the first signal line and the second signal line are connected to ground.

[0010] Further, the transistor is a triode, and the triode is provided with a base, a collector and an emitter.

[0011] Further, the triode is an NPN type triode, the first signal line is connected to the base of the NPN type triode, the second signal line is connected to the collector of the NPN type triode, the emitter of the NPN type triode is connected to ground, and the first signal line and the second signal line are connected to the positive power supply voltage through a resistor.

[0012] Further, the triode is a PNP type triode, the first signal line is connected to the collector of the NPN type triode, the second signal line is connected to the base of the NPN type triode, the emitter of the NPN type triode is connected to the positive power supply voltage, and the first signal line and the second signal line are connected to ground through a resistor.

[0013] Further, the transistor is a field effect transistor, and the field effect transistor is provided with a drain, a source and a gate.

[0014] Further, the transistor is an N-channel field effect transistor, the first signal line is connected to the gate of the N-channel field effect transistor, the second signal line is connected to the drain of the N-channel field effect transistor, the source of the N-channel field effect transistor is connected to ground, and the first signal line and the second signal line are connected to the positive power supply voltage through a resistor.

[0015] Further, the transistor is a P-channel field effect transistor, the first signal line is connected to the drain of the N-channel field effect transistor, the second signal line is connected to the gate of the N-channel field effect transistor, the source of the N-channel field effect transistor is connected to the positive power supply voltage, and the first signal line and the second signal line are connected to ground through a resistor.

[0016] Further, the single-touch physical switch is connected in parallel with a filter capacitor, and the design of the filter circuit and the transistor can effectively eliminate the jitter of the signal during switching, ensuring accurate detection of the signal.

[0017] The single-touch switch realizes a safe switching circuit of multi-line system, which comprises a power supply unit, a chip controller and a single-touch switch;

[0018] The chip controller is used for receiving a level control signal of the single-touch switch circuit and controlling the operation of the device according to the level control signal;

[0019] The power supply unit is used for providing stable voltage and current to ensure the normal operation of the single-touch switch circuit and the chip controller;

[0020] The single-touch switch, the first signal line and the second signal line are connected with the chip controller at one end away from the transistor, and are used for outputting the level control signal to the chip controller.

[0021] Compared with the prior art, the single-touch switch circuit has the advantages that the existing multi-touch switch structure is replaced by the single-touch switch, the transistor is arranged, three pins are arranged on the transistor, the single-touch physical switch is connected in parallel with the transistor, the first signal line and the second signal line are connected in series with the transistor, the level change between the first signal line and the second signal line is the same as that of the traditional three-wire button switch when the single-touch physical switch is pressed or released, the voltage change of the signal line is accurate and reliable in the high level state or the low level state, the service life of the single-touch physical switch is higher than that of the multi-touch physical switch, the service life of the entire single-touch switch circuit is improved, and the single-touch switch is more convenient to use. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the prior art;

[0023] Figure 2 It is a control schematic diagram of the utility model;

[0024] Figure 3 It is a circuit diagram of the chip controller and the power supply unit in the utility model;

[0025] Figure 4 It is a circuit diagram of the first embodiment in the utility model;

[0026] Figure 5 It is a circuit diagram of the second embodiment in the utility model;

[0027] Figure 6 It is a circuit diagram of the third embodiment in the utility model;

[0028] Figure 7 It is a circuit diagram of the fourth embodiment in the utility model; DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model. Figures 2-7 The single-touch switch and the single-touch switch realizing the multi-wire safety switch circuit of the utility model are described in detail as follows:

[0031] The single-touch switch and the single-touch switch realize a safety switch circuit of multi-line system, including a single-touch switch circuit, a chip controller and a power supply unit, the chip controller is used for receiving a level control signal of the single-touch switch circuit and controlling the work of the equipment according to the level control signal, the power supply unit is used for providing stable voltage and current to ensure the normal operation of the single-touch switch circuit and the chip controller, and the single-touch switch circuit is used for outputting the level control signal to the chip controller.

[0032] The single-touch switch includes a single-touch physical switch, a first signal line, a second signal line and a transistor, the single-touch switch further includes the first signal line, the second signal line and the transistor, the transistor includes three pins, the first signal line and the second signal line are respectively connected in series with any two of the three pins, the first signal line or the second signal line is respectively connected in series with a resistor, a third pin of the two pins of the three pins except for the two pins connected in series with the first signal line and the second signal line is connected to ground or a positive power supply voltage, the first signal line and the second signal line are also connected to ground or the positive power supply voltage, when one pin of the transistor is connected to ground, the first signal line and the second signal line are connected to the positive power supply voltage, when one pin of the transistor is connected to the positive power supply voltage, the first signal line and the second signal line are connected to ground, the first signal line and the second signal line can both generate a level control signal, the single-touch physical switch is connected in parallel with any two of the three pins of the transistor, the single-touch physical switch can switch between high level and low level once for each time of pressing the single-touch switch circuit, the chip controller receives the information of the level switching and processes it, so that a plurality of modes can be controlled through a single material button, the single-touch physical switch is connected in parallel with a filter capacitor, and the design of the filter circuit and the transistor can effectively eliminate the jitter of the signal during switching and ensure the accurate detection of the signal. The chip controller and the power supply unit are prior art, the improvement of the present scheme is the single-touch switch, therefore, the structure and principle of the chip controller and the power supply unit will not be described here, and a person skilled in the art can select different chip controllers and power supply units to connect with the single-touch switch according to the actual situation.

[0033] Embodiment one, as shown in the following figure: Figure 4

[0034] The transistor is an NPN type transistor, which is provided with a base, a collector and an emitter, the first signal line is connected to the base of the NPN type transistor through a resistor R3, the second signal line is connected to the collector of the NPN type transistor through a resistor R4, the emitter of the NPN type transistor is connected to ground, the first signal line and the second signal line are connected to a positive power supply voltage through pull-up resistors R1 and R2 respectively, and the two ends of the single-touch physical switch are connected to the base and the emitter.

[0035] ​When the single-touch physical switch is not pressed: the base of the NPN transistor is connected to VCC through the pull-up resistor R1, the NPN transistor is in the on state, and because the NPN transistor is on, at this time the second signal line is pulled low to connect to the low level through the NPN transistor, and the first signal line remains high through the pull-up resistor R1.

[0036] When the single-touch physical switch is pressed: the single-touch physical switch connects the base of the NPN transistor to GND, the NPN transistor is in the off state, and because the NPN transistor is off, at this time the second signal line remains high through the pull-up resistor R2, and the first signal line is pulled to GND to be at the low level through the single-touch physical switch.

[0037] Embodiment two, as shown in Figure 5

[0038] The transistor is a PNP transistor, which is provided with a base, a collector and an emitter, the first signal line is connected to the collector of the PNP transistor through the resistor R4, the second signal line is connected to the base of the PNP transistor through the resistor R3, the emitter of the PNP transistor is connected to the positive power supply voltage, the first signal line and the second signal line are respectively connected to the ground through the pull-up resistor R1 and the pull-down resistor R2, and the two ends of the single-touch physical switch are connected to the base and the emitter.

[0039] When the single-touch physical switch is not pressed: the base of the PNP transistor is connected to GND through the pull-down resistor R1, the PNP transistor is in the on state, and because the PNP transistor is on, at this time the first signal line is pulled high to connect to the high level through the PNP transistor, and the second signal line remains low through the pull-down resistor R1.

[0040] When the single-touch physical switch is pressed: the single-touch physical switch connects the base of the PNP transistor to VCC, the PNP transistor is in the off state, and because the PNP transistor is off, at this time the first signal line remains low through the pull-up resistor R2, and the first signal line is pulled to VCC to be at the high level through the single-touch physical switch.

[0041] Embodiment three, as shown in Figure 6

[0042] The transistor is an N-channel field effect transistor, which is provided with a drain, a source and a gate, the first signal line is connected to the gate of the N-channel field effect transistor through the resistor R3, the second signal line is connected to the drain of the N-channel field effect transistor through the resistor R4, the source of the N-channel field effect transistor is connected to the ground, the first signal line and the second signal line are respectively connected to the positive power supply voltage through the pull-up resistor R1 and the pull-up resistor R2, and the two ends of the single-touch physical switch are connected to the gate and the source.

[0043] ​​When the single-touch physical switch is not pressed: the gate of the N-channel field effect tube is connected to VCC through the pull-up resistor R1, the N-channel field effect tube is in the on state, and the second signal line is pulled low to the low level through the N-channel field effect tube due to the on state of the N-channel field effect tube, and the first signal line is kept at the high level through the pull-up resistor R1.

[0044] When the single-touch physical switch is pressed: the single-touch physical switch connects the gate of the N-channel field effect tube to GND, the N-channel field effect tube is in the off state, and the first signal line is pulled to GND to be at the low level through the single-touch physical switch due to the off state of the N-channel field effect tube, and the second signal line is kept at the high level through the pull-up resistor R2.

[0045] Embodiment four, as shown in Figure 7

[0046] The transistor is a P-channel field effect tube, which is provided with a drain, a source and a gate, the first signal line is connected to the drain of the P-channel field effect tube through the resistor R3, the second signal line is connected to the gate of the P-channel field effect tube through the resistor R4, the source of the P-channel field effect tube is connected to the positive power voltage, the first signal line and the second signal line are respectively connected to the ground through the pull-up resistor R1 and the pull-up resistor R2, and the gate and the source of the single-touch physical switch are connected.

[0047] When the single-touch physical switch is not pressed: the gate of the P-channel field effect tube is connected to VCC through the pull-up resistor R1, the P-channel field effect tube is in the on state, and the second signal line is pulled low to the low level through the P-channel field effect tube due to the on state of the P-channel field effect tube, and the first signal line is kept at the high level through the pull-up resistor R1.

[0048] When the single-touch physical switch is pressed: the single-touch physical switch connects the gate of the P-channel field effect tube to GND, the P-channel field effect tube is in the off state, and the first signal line is pulled to GND to be at the low level through the single-touch physical switch due to the off state of the P-channel field effect tube, and the second signal line is kept at the high level through the pull-up resistor R2.

[0049] It is obvious for those skilled in the art that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and can realize the utility model in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims instead of the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any reference signs in the claims should not be regarded as limiting the involved claims.​

Claims

1. A single contact switch comprising a single contact physical switch, characterized by: The single-touch switch further comprises a first signal line, a second signal line and a transistor, the transistor comprises three pins, the first signal line and the second signal line are connected in series with any two of the three pins, the first signal line or the second signal line is connected in series with a resistor, a third pin of the two pins other than the two pins connected in series with the first signal line and the second signal line is connected to ground or a positive power supply voltage, the first signal line and the second signal line are also connected to ground or the positive power supply voltage, the first signal line and the second signal line can both generate a level control signal, and a single-touch physical switch is connected in parallel with any two of the three pins of the transistor. When one pin of the transistor is connected to ground, the first signal line and the second signal line are connected to the positive power supply voltage. When one pin of the transistor is connected to the positive power supply voltage, the first signal line and the second signal line are connected to ground.

2. The single-contact switch of claim 1, wherein: The transistor is a triode, and the triode comprises a base, a collector and an emitter.

3. The single-contact switch of claim 2, wherein: The triode is an NPN triode, the first signal line is connected to the base of the NPN triode, the second signal line is connected to the collector of the NPN triode, the emitter of the NPN triode is connected to ground, and the first signal line and the second signal line are connected to the positive power supply voltage through a resistor.

4. The single-contact switch of claim 2, wherein: The triode is a PNP triode, the first signal line is connected to the collector of the NPN triode, the second signal line is connected to the base of the NPN triode, the emitter of the NPN triode is connected to the positive power supply voltage, and the first signal line and the second signal line are connected to ground through a resistor.

5. The single-contact switch of claim 1, wherein: The transistor is a field effect transistor, and the field effect transistor comprises a drain, a source and a gate.

6. The single-contact switch of claim 5, wherein: The transistor is an N-channel field effect transistor, the first signal line is connected to the gate of the N-channel field effect transistor, the second signal line is connected to the drain of the N-channel field effect transistor, the source of the N-channel field effect transistor is connected to ground, and the first signal line and the second signal line are connected to the positive power supply voltage through a resistor.

7. The single-contact switch of claim 5, wherein: The transistor is a P-channel field effect transistor, the first signal line is connected to the drain of the N-channel field effect transistor, the second signal line is connected to the gate of the N-channel field effect transistor, the source of the N-channel field effect transistor is connected to the positive power supply voltage, and the first signal line and the second signal line are connected to ground through a resistor.

8. The single-contact switch according to any one of claims 1-7, characterized in that: The single-touch physical switch is connected in parallel with a filter capacitor.

9. A safety switch circuit implementing a multi-wire system with a single contact switch, characterized by: The single-touch switch further comprises a power supply unit, a chip controller and the single-touch switch according to any one of claims 1-8. The chip controller is configured to receive a level control signal of the single-touch switch circuit and control the operation of a device according to the level control signal. The power supply unit is electrically connected to the chip controller and configured to provide stable voltage and current to ensure the normal operation of the single-touch switch circuit and the chip controller. The single-touch switch is connected to the chip controller and configured to output the level control signal to the chip controller.

Images