CN213637506U - Voltage switching circuit for user interface - Google Patents
Voltage switching circuit for user interface Download PDFInfo
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- CN213637506U CN213637506U CN202022830205.6U CN202022830205U CN213637506U CN 213637506 U CN213637506 U CN 213637506U CN 202022830205 U CN202022830205 U CN 202022830205U CN 213637506 U CN213637506 U CN 213637506U
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Abstract
The utility model discloses a voltage switching circuit for user interface belongs to power supply switching circuit technical field, has solved user interface connection mode reliability problem, and its technical scheme main points are including power supply circuit, and it has voltage output end, and voltage output end connects user interface and is used for providing supply voltage, characterized by, be provided with the switching circuit module between voltage output end and the user interface, the switching circuit module includes pyroelectric infrared sensor, "OR" gate circuit, relay module and feedback circuit, through circuit connection, has reached the response human body and has carried out reliable, safe effect of first power supply.
Description
Technical Field
The utility model relates to a power supply switching circuit field relates to a voltage switching circuit for user interface especially.
Background
Generally, a switch and a driving circuit module are arranged on an existing user interface circuit, the switch and the driving circuit module are connected with a transformer, an output end of the transformer is used for supplying power, and as shown in the circuit shown in fig. 1, a voltage switching control signal can be output through a microprocessor, so that a triac Q1 is turned on, and the switch and the driving circuit module are made to reflect, so that the voltage at an input side of the transformer is adjusted, and the voltage output of the transformer is changed.
It follows that, in the above-described circuit, since the output switching of the voltage is directly controlled by the microprocessor, there are some disadvantages in terms of use by the user. The user just can obtain the electric energy to connect the interface, and the potential safety hazard of electric leakage appears easily in user's manual connection interface and the switching operation, is unfavorable for the safety operation.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to prior art's weak point, solve the technical problem in the correlation technique to a certain extent at least, provide a voltage switching circuit for user interface to reach the purpose of reliably switching the circular telegram between voltage output end and the user interface.
In order to solve the technical problem, the technical scheme of the utility model is that: a voltage switching circuit for a user interface comprises a power supply circuit, a switching circuit module and a control circuit, wherein the power supply circuit is provided with a voltage output end, the voltage output end is connected with the user interface and used for providing power supply voltage, the switching circuit module is arranged between the voltage output end and the user interface and comprises a pyroelectric infrared sensor, an OR gate circuit, a relay module and a feedback circuit, the pyroelectric infrared sensor is used for sensing the distance of a human body and outputting a trigger signal, the feedback circuit is connected with the user interface and used for collecting the voltage of the user interface,
the 'OR' gate circuit is connected with the pyroelectric infrared sensor and the feedback circuit and performs logic output according to a trigger signal or sampling voltage, the relay module is connected with the 'OR' gate circuit, and a normally open switch of the relay module is connected on a power supply line between the voltage output end and the user interface.
As a specific aspect of the present invention, it may be preferable that: and a manual switch is connected in parallel to a normally open switch of the relay module.
As a specific aspect of the present invention, it may be preferable that: the feedback circuit comprises a sampling resistor R12 and a sampling resistor R14 which are connected in series.
As a specific aspect of the present invention, it may be preferable that: the feedback circuit comprises a sampling resistor R13 and a sampling resistor R14 which are connected in series, and a photoelectric coupler U1 which is connected with the sampling resistor R14 in parallel, wherein the lower end of the sampling resistor R14 is grounded, one end of the output side of the photoelectric coupler U1 is connected with a voltage Vcc, and the other end of the output side of the photoelectric coupler U1 is connected with an OR gate circuit.
The utility model discloses technical effect mainly embodies in following aspect: with the help of human response technique, through the output control who supplies power to human response, when first power on, work is more reliable like this, it is visible from the theory of operation, utilize pyroelectric infrared sensor response human, when human is close to for the first time and carries out user interface connection, the normally open switch of relay module is closed this moment, user interface part just can supply power and export, feedback circuit acts on relay module and makes its normally open switch be in the closure always, the human body still can continue to let user interface supply power output after leaving, unless there is not power output on this side at voltage output end. Therefore, the circuit is suitable for meeting the working requirement of the user in the working environment.
Drawings
FIG. 1 is a circuit application environment in the background art;
FIG. 2 is a schematic circuit diagram in embodiment 1;
fig. 3 is a schematic circuit diagram in embodiment 2.
Reference numerals: 100. a power supply circuit; 200. a voltage output terminal; 300. a user interface; 400. a switching circuit module; 410. a pyroelectric infrared sensor; 420. an OR gate circuit; 430. a relay module; 440. a feedback circuit.
Detailed Description
The embodiments of the present invention will be described in detail below, examples of which are illustrated in the accompanying drawings, and the embodiments described below by referring to the drawings are exemplary and intended to explain the present invention so that the technical solutions of the present invention can be more easily understood and grasped, and cannot be construed as limiting the present invention.
Example 1:
a voltage switching circuit for a user interface 300, which may be seen in fig. 1 and 2, includes a power supply circuit 100 having a voltage output 200. The power supply circuit 100 may be any commercially available power supply device with an output voltage range of ± 210V, and the power supply circuit 100 is not a design point of the application. Fig. 1 is an example. The voltage output terminal 200 is connected to the user interface 300 for providing a supply voltage, and a switching circuit module 400 is disposed between the voltage output terminal 200 and the user interface 300.
Specifically, the design of the present embodiment focuses on that, as shown in fig. 2, the switching circuit module 400 includes a pyroelectric infrared sensor 410, an or gate 420, a relay module 430, and a feedback circuit 440. The pyroelectric infrared sensor 410 is used for sensing a distance from a human body and outputting a trigger signal, the feedback circuit 440 is connected to the user interface 300 and used for collecting voltage of the user interface 300, the or gate circuit 420 is connected with the pyroelectric infrared sensor 410 and the feedback circuit 440 and performs logic output according to the trigger signal or the sampling voltage, the relay module 430 is connected to the or gate circuit 420, and a normally open switch of the relay module 430 is connected to a power supply line between the voltage output end 200 and the user interface 300. The normally open switch of the relay module 430 is connected in parallel with a manual switch S1.
The feedback circuit 440 includes a sampling resistor R12 and a sampling resistor R14 connected in series.
The relay module 430 comprises a resistor R11, a resistor R12, an NPN triode Q11, a coil K1 of a relay and a normally open switch K1-1, wherein one end of the resistor R11 is connected with the output end of the OR gate 420, the other end of the resistor R11 is connected with the base of the NPN triode and one end of the resistor R12, the other end of the resistor R12 is grounded with the emitter of the NPN triode Q11, the collector of the NPN triode Q11 is connected with the relay coil K1 and the anode of the diode D11, and the cathode of the diode D11 and the other end of the relay coil K1 are connected with a voltage source 12V.
The operation and application process known from the circuit structure is as follows: the manual switch S1 is for manual control, is normally left out of consideration, and is in an off state. Now, when a human body approaches the circuit for the first time, the pyroelectric infrared sensor 410 senses that the human body approaches and then outputs the trigger signal S1, the signal S1 is at a high level, at this time, the other end of the or gate circuit 420 obtains a low level through the feedback circuit 440, so that the output of the or gate circuit 420 still does not have the high level, so that the triode Q11 is turned on, the relay coil K1 is powered, the normally open switch K1-1 is closed, at this time, the user interface 300 can obtain power supply, the feedback circuit 440 also obtains power supply, the feedback circuit 440 outputs a high level Vcc, at this time, the human body still stays near the circuit or the human body is far away from the circuit, and because the feedback circuit 440 continuously outputs a high level signal, the relay module 430 is still in a working state, so that the relay coil K1 is powered all the time.
At this time, if the voltage output terminal 200 is powered off, the relay module 430 is reset, and the normally open switch K1-1 is opened. Waiting for the next normal operation, and restarting according to the above operation mode.
The advantage of setting up like this is that can carry out automatic control by means of human response, improves the security of operation circular telegram.
In addition, based on the above scheme, embodiment 2 is also designed:
referring to fig. 3, the difference from embodiment 1 is in the feedback circuit 440. In this embodiment 2, the feedback circuit 440 includes a sampling resistor R13 and a sampling resistor R14 connected in series, and a photo coupler U1 connected in parallel to the sampling resistor R14, the lower end of the sampling resistor R14 is grounded, one end of the output side of the photo coupler U1 is connected to the voltage Vcc, and the other end is connected to the or gate 420.
Firstly, voltage division and sampling are carried out through sampling resistors R13 and R14, and then signal feedback and transmission are carried out through a photoelectric coupler U1. The feedback circuit 440 performs signal transmission through the photocoupler U1, improves electrical isolation performance, and can further improve reliability of signal feedback.
Of course, the above is only a typical example of the present invention, and besides, the present invention can also have other various specific embodiments, and all technical solutions adopting equivalent replacement or equivalent transformation are all within the scope of the present invention as claimed.
Claims (4)
1. A voltage switching circuit for a user interface comprises a power supply circuit having a voltage output connected to the user interface for providing a supply voltage, it is characterized in that a switching circuit module is arranged between the voltage output end and the user interface, the switching circuit module comprises a pyroelectric infrared sensor, an OR gate circuit, a relay module and a feedback circuit, the pyroelectric infrared sensor is used for sensing the distance of a human body and outputting a trigger signal, the feedback circuit is connected with the user interface and used for collecting the voltage of the user interface, the OR gate circuit is connected with the pyroelectric infrared sensor and the feedback circuit, and the relay module is connected to an OR gate circuit, and a normally open switch of the relay module is connected to a power supply circuit between the voltage output end and the user interface.
2. The voltage switching circuit for a user interface of claim 1, wherein: and a manual switch is connected in parallel to a normally open switch of the relay module.
3. The voltage switching circuit for a user interface of claim 1, wherein: the feedback circuit comprises a sampling resistor R12 and a sampling resistor R14 which are connected in series.
4. The voltage switching circuit for a user interface of claim 1, wherein: the feedback circuit comprises a sampling resistor R13 and a sampling resistor R14 which are connected in series, and a photoelectric coupler U1 which is connected with the sampling resistor R14 in parallel, wherein the lower end of the sampling resistor R14 is grounded, one end of the output side of the photoelectric coupler U1 is connected with a voltage Vcc, and the other end of the output side of the photoelectric coupler U1 is connected with an OR gate circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022830205.6U CN213637506U (en) | 2020-11-30 | 2020-11-30 | Voltage switching circuit for user interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022830205.6U CN213637506U (en) | 2020-11-30 | 2020-11-30 | Voltage switching circuit for user interface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213637506U true CN213637506U (en) | 2021-07-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022830205.6U Active CN213637506U (en) | 2020-11-30 | 2020-11-30 | Voltage switching circuit for user interface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213637506U (en) |
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2020
- 2020-11-30 CN CN202022830205.6U patent/CN213637506U/en active Active
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