Ultrasonic infrared induction switch device

Abstract

The utility model discloses an ultrasonic infrared induction switch device, and belongs to the technical field of induction delay switches. The utility model provides an ultrasonic infrared induction switch device which comprises an AC / DC conversion circuit, a DC-DC voltage stabilizing circuit, an infrared signal detection amplifying circuit, an ultrasonic signal transmitting circuit, an ultrasonic signal receiving circuit, an ambient light detection circuit, a zero-cross detection circuit, an auxiliary switch control circuit, a low-power-consumption control integrated circuit and a relay control circuit. The low-power-consumption control integrated circuit judges the processed ultrasonic signals, reads the current ambient light when the pyroelectric infrared signals also detect someone, and sends out control signals to open the relay when detecting that the ambient light is smaller than a set value. The accuracy of the action of the intelligent switch is effectively improved, and the intelligent degree of the lighting system is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to an ultrasonic infrared induction switch device and belongs to the technical field of induction time delay switch. BACKGROUND

[0002] Nowadays, energy conservation and emission reduction have become a global consensus, and the intelligent transformation of public place lighting systems has become one of the important means to achieve this goal. Currently, many places such as offices and conference rooms increasingly use automatic time delay switches to control lighting systems. The working principle of this system is to detect whether anyone enters the area through the built-in sensor (usually an infrared sensor) and to determine whether the light needs to be automatically turned on in combination with the ambient light intensity. Once the personnel leave, the system will start the time delay mechanism and automatically turn off the light after the preset time, thereby effectively saving energy and reducing energy consumption.

[0003] However, the existing infrared sensor technology still has some limitations in practical application. In particular, when personnel are engaged in office activities such as typing, operating a computer, and other small actions in the office, the infrared radiation changes produced by these actions are weak and often cannot be accurately captured by the existing infrared sensor. In this case, even if the personnel still stay in the room, the lighting system may be prematurely turned off due to misjudgment, resulting in insufficient light and affecting normal work and office efficiency. This problem not only reduces the user's experience, but also limits the promotion and application of automatic time delay switches in some fine application scenarios. Therefore, in view of the deficiencies of the existing technology, it is necessary to develop an infrared sensor that can more accurately detect small human actions to optimize the intelligent control of public place lighting systems. SUMMARY

[0004] In order to improve the intelligent level of the lighting system while ensuring work efficiency and achieving energy conservation and emission reduction, the utility model provides an ultrasonic infrared induction switch device, which comprises: an AC / DC conversion circuit, a DC-DC voltage stabilizing circuit, an infrared signal detection and amplification circuit, an ultrasonic signal transmission circuit, an ultrasonic signal receiving circuit, an ambient light detection circuit, a zero-crossing detection circuit, an auxiliary switch control circuit, a low-power control integrated circuit, and a relay control circuit.

[0005] The output end of the AC / DC conversion circuit is connected with the input end of the DC-DC voltage stabilizing circuit, auxiliary switch control circuit and zero-crossing detection circuit respectively; the output end of the DC-DC voltage stabilizing circuit, auxiliary switch control circuit and zero-crossing detection circuit is connected with the input end of the low-power consumption control integrated circuit; the output end of the infrared signal detection and amplification circuit, ultrasonic signal receiving circuit and ambient light detection circuit is connected with the input end of the low-power consumption control integrated circuit; the input end of the ultrasonic signal transmitting circuit is connected with the output end of the low-power consumption control integrated circuit; the input end of the relay control circuit is connected with the output end of the low-power consumption control integrated circuit.

[0006] The low-power consumption control integrated circuit judges the external environment by collecting ultrasonic signal, pyroelectric infrared signal and ambient light signal, and controls the relay to be turned on or closed.

[0007] In an embodiment, the DC-DC voltage stabilizing circuit comprises a voltage conversion chip U1 and a capacitor.

[0008] The 8-pin input voltage of the voltage conversion chip U1 is connected with the 1-pin output converted voltage; the capacitor C57 and the capacitor C58 are connected in parallel and connected between the 8-pin and the 4-pin of the voltage conversion chip U1, and the 4-pin of the voltage conversion chip U1 is grounded; the 1-pin and the 2-pin of the voltage conversion chip U1 are connected and grounded through the capacitor C31, and the 6-pin and the 7-pin are connected.

[0009] In an embodiment, the infrared signal detection and amplification circuit comprises a pyroelectric infrared sensor PIR and an operational amplifier; the infrared signal detected by the pyroelectric infrared sensor PIR is sent to the low-power consumption control integrated circuit after being amplified by the operational amplifier.

[0010] In an embodiment, the ultrasonic signal transmitting circuit comprises a crystal oscillator X2, a Schmitt trigger U9 and a triode Q2; the signal generated by the crystal oscillator is loaded to the ultrasonic wave transmitting probe to emit square wave outside after being processed by the Schmitt trigger U9; the E pole of the triode Q2 is controlled by the low-power consumption control integrated circuit to enable the ultrasonic wave transmission.

[0011] In an embodiment, the ultrasonic signal receiving circuit comprises an ultrasonic wave receiving probe RX1 and an operational amplifier U8; the ultrasonic wave signal received by the ultrasonic wave receiving probe RX1 is converted into a tiny voltage signal, and is sent to the low-power consumption control integrated circuit after being amplified by the operational amplifier and a band-pass filter.

[0012] In an embodiment, the ambient light detection circuit comprises an ambient light sensor, which converts light into a voltage signal and sends it to the low-power consumption control integrated circuit.

[0013] In one embodiment, the zero-crossing detection circuit includes resistors R109, R110, R111, which constitute a voltage dividing circuit, and a transistor Q102, the G terminal of which is connected to the resistors R110 and R111, and when the voltage at the TP108 test point exceeds 0.7V after the zero-crossing point of the AC voltage, the C and E terminals of the transistor Q102 are turned on.

[0014] The utility model has the advantages of:

[0015] The working principle of the utility model is that a square wave with a frequency of 40KHz is generated in the device by a circuit, and the ultrasonic wave signal with a frequency of 40KHz is emitted by an ultrasonic wave emission probe. If there is a moving object in the range, the ultrasonic wave signal that bounces back will be received by the ultrasonic wave receiving probe in the device. After being processed by the band-pass filter amplification circuit in the device, the signal is converted into an effective and stable voltage signal. The processed ultrasonic wave detection signal is sent to the integrated control chip MCU, which judges the processed ultrasonic wave signal. When the voltage amplitude exceeds 0.5V and the pyroelectric infrared signal also detects a person, the MCU reads the current ambient light. When the ambient light is detected to be less than the set value, the MCU sends a control signal to open the relay. The accuracy of the action of the intelligent switch is effectively improved, and the intelligent degree of the lighting system is improved.

[0016] In addition, in order to prolong the service life of the relay, the device has a zero-crossing detection circuit of the AC voltage. The control signal for opening the relay will close the contact at the zero-crossing point of the AC voltage, reducing the arc draw and prolonging the service life of the relay. The device also has an auxiliary switch detection circuit, which can realize the function of manually opening and automatically closing the switch device. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The structure block diagram of the ultrasonic wave infrared induction switch device in the utility model embodiment 1.

[0018] Figure 2 The AC / DC conversion circuit diagram in the utility model embodiment 1.

[0019] Figure 3 The DC-DC voltage stabilizing circuit diagram in the utility model embodiment 1.

[0020] Figure 4 The infrared signal detection amplification circuit diagram in the utility model embodiment 1.

[0021] Figure 5 The ultrasonic wave signal emission circuit diagram in the utility model embodiment 1.

[0022] Figure 6 This is a circuit diagram of the ultrasonic signal receiving circuit in Embodiment 1 of this utility model.

[0023] Figure 7 This is a circuit diagram of the ambient light detection circuit in Embodiment 1 of this utility model.

[0024] Figure 8 This is the zero-crossing detection circuit in Embodiment 1 of this utility model.

[0025] Figure 9 This is the auxiliary switch control circuit in Embodiment 1 of this utility model.

[0026] Figure 10 This is the control integrated circuit in Embodiment 1 of this utility model.

[0027] Figure 11 This is the relay control circuit in Embodiment 1 of this utility model. Detailed Implementation

[0028] The following is a detailed description of this utility model.

[0029] Example 1

[0030] like Figure 1 The diagram shown is a structural block diagram of the ultrasonic infrared sensing switch device of this utility model, including: AC / DC conversion circuit, DC-DC voltage regulator circuit, infrared signal detection and amplification circuit, ultrasonic signal transmitting circuit, ultrasonic signal receiving circuit, ambient light detection circuit, zero-crossing detection circuit, auxiliary switch control circuit, low-power control integrated circuit, and relay control circuit.

[0031] The structure of the AC / DC conversion circuit is as follows: Figure 2 As shown, it includes a varistor MOV-3, a thermal fuse, an inductor L101, a capacitor, rectifier diodes D101 and D102, a control chip A1, and a TVS diode D103, etc.

[0032] The structure of a DC-DC voltage regulator circuit is as follows: Figure 3 As shown, the DC-DC voltage regulator circuit steps down a 12V power supply to 5V, and mainly consists of capacitors and voltage conversion chips.

[0033] The structure of the infrared signal detection amplifier circuit is as follows: Figure 4 As shown, it includes components such as a pyroelectric infrared sensor (PIR), resistors, capacitors, and operational amplifiers. The infrared signal detected by the pyroelectric infrared sensor (PIR) is amplified by the operational amplifier to a voltage signal of about 1V and then sent to the integrated control circuit.

[0034] The structure of the ultrasonic signal transmitting circuit is as follows: Figure 5As shown, the system comprises a crystal oscillator X2, a Schmitt trigger U9, resistors, capacitors, and a transistor Q2. The crystal oscillator generates a 40kHz signal, which, after passing through the Schmitt trigger, produces a 24V square wave, which is then applied to the ultrasonic transducer probe to emit a 40kHz square wave. The emitter (E) of transistor Q2 is controlled by an integrated control circuit, and its main function is to enable the emission of ultrasonic waves.

[0035] The structure of the ultrasonic signal receiving circuit is as follows: Figure 6 As shown, it includes an ultrasonic receiving probe RX1, an operational amplifier U8, resistors, capacitors, etc. After receiving an ultrasonic signal, the ultrasonic receiving probe converts the changing ultrasonic signal into a small voltage signal, which is then amplified to a voltage signal of about 1V by the operational amplifier and bandpass filter and sent to the integrated control circuit.

[0036] The structure of the ambient light detection circuit is as follows: Figure 7 As shown, it includes an ambient light sensor, resistors, capacitors, etc. The ambient light sensor converts light into a voltage signal, which is then fed to the integrated control circuit.

[0037] The structure of the zero-crossing detection circuit is as follows: Figure 8 As shown, it mainly consists of resistors, capacitors, diodes, transistors, etc. Resistors R109, R110, and R111 form a voltage divider circuit. When the AC voltage crosses the zero point of 6V, the voltage at the TP108 test point exceeds 0.7V, and the collector and emitter of transistor Q102 will conduct, causing the voltage at TP109 to become low. When the PB0 pin of the integrated control circuit detects the falling edge, it determines that the AC voltage has crossed the zero point.

[0038] The structure of the auxiliary switch control circuit is as follows: Figure 9 As shown, it mainly consists of a rectifier diode D105, a transistor Q103, a MOSFET Q105, resistors, and capacitors. When the external auxiliary button is turned on, AC current flows into the rectifier diode. After voltage division by the resistors, the collector (C) and gate (G) terminals of the transistor Q103 conduct. Simultaneously, the voltage at the gate (G) terminal of the MOSFET Q105 changes from 0V to 12V, and the drain (D) and source (S) terminals of the MOSFET conduct. At the same time, the voltage at TP107 becomes level. When the PD4 pin of the integrated control circuit detects a falling edge, it is considered that the external auxiliary switch is turned on.

[0039] The structure of low-power control integrated circuits is as follows Figure 10 As shown, it is mainly composed of an MCU chip and capacitors.

[0040] The structure of the relay control circuit is as follows: Figure 11As shown, mainly by triode Q104, relay, diode, resistor, etc. Integrated control circuit sends control signal after the G pole of triode will become high level, the C pole and E pole of triode Q104 will be conducted, the coil of relay will be current, the contact of relay will be closed, the relay is conducted, the lamp connected outside will be opened.

[0041] The working principle of the utility model is that the inside of the device has a circuit to generate a square wave of 40KHz frequency, the ultrasonic wave signal of 40KHz is emitted through the ultrasonic wave emission probe, if there is a moving object in the range, the ultrasonic wave signal bounced back will be received by the ultrasonic wave receiving probe in the device, then after being processed by the band-pass filter amplification circuit in the device, it is converted into an effective stable voltage signal, the processed ultrasonic wave detection signal is sent into the integrated control chip MCU, the integrated control chip MCU judges the processed ultrasonic wave signal, when the voltage amplitude exceeds 0.5V, and the pyroelectric infrared signal also detects a person, the MCU reads the current ambient light, when detecting that the ambient light is less than the set value, the MCU will send a control signal to open the relay. In order to prolong the service life of the relay, the zero-crossing detection circuit of alternating voltage is arranged in the device. The control signal for opening the relay will close the contact at the zero-crossing point of the alternating voltage, reducing the arc draw and prolonging the service life of the relay. The detection circuit of auxiliary switch is also added in the device, which can realize the function of manually opening and automatically closing the switch device.

[0042] Although the utility model has disclosed as above with preferable embodiment, it is not used to limit the utility model, anyone who is familiar with this technology can make various changes and modifications without departing from the spirit and scope of the utility model, therefore the protection scope of the utility model should be limited by the claims.

Claims

1. An ultrasonic infrared sensing switch device, characterized by, The application relates to an AC / DC conversion circuit, a DC-DC voltage stabilizing circuit, an infrared signal detection and amplification circuit, an ultrasonic signal transmitting circuit, an ultrasonic signal receiving circuit, an ambient light detection circuit, a zero-crossing detection circuit, an auxiliary switch control circuit, a low-power control integrated circuit and a relay control circuit. The output ends of the AC / DC conversion circuit are connected with the input ends of the DC-DC voltage stabilizing circuit, the auxiliary switch control circuit and the zero-crossing detection circuit respectively; the output ends of the DC-DC voltage stabilizing circuit, the auxiliary switch control circuit and the zero-crossing detection circuit are connected with the input ends of the low-power control integrated circuit; the output ends of the infrared signal detection and amplification circuit, the ultrasonic signal receiving circuit and the ambient light detection circuit are connected with the input ends of the low-power control integrated circuit; the input end of the ultrasonic signal transmitting circuit is connected with the output end of the low-power control integrated circuit; and the input end of the relay control circuit is connected with the output end of the low-power control integrated circuit. The low-power control integrated circuit judges the external environment by collecting ultrasonic signals, pyroelectric infrared signals and ambient light signals, and controls the relay to be turned on or closed. The DC-DC voltage stabilizing circuit comprises a voltage conversion chip U1 and a capacitor.

2. The ultrasonic infrared sensing switch device of claim 1, wherein, The 8-pin section of the voltage conversion chip U1 inputs voltage, and the 1-pin section outputs converted voltage; the capacitor C57 and the capacitor C58 are connected in parallel and connected between the 8-pin section and the 4-pin section of the voltage conversion chip U1, the 4-pin section of the voltage conversion chip U1 is grounded, and the 1-pin section and the 2-pin section of the voltage conversion chip U1 are connected and grounded through the capacitor C31, and the 6-pin section and the 7-pin section are connected. The infrared signal detection and amplification circuit comprises a pyroelectric infrared sensor PIR and an operational amplifier; the infrared signal detected by the pyroelectric infrared sensor PIR is amplified by the operational amplifier and then sent to the low-power control integrated circuit.

3. The ultrasonic infrared sensing switch device of claim 1, wherein, The ultrasonic signal transmitting circuit comprises a crystal oscillator X2, a Schmitt trigger U9 and a triode Q2; the crystal oscillator generates a signal which is converted into a square wave by the Schmitt trigger U9 and then loaded to an ultrasonic wave transmitting probe to be transmitted outward, and the E pole of the triode Q2 is controlled by the low-power control integrated circuit to enable the ultrasonic wave to be transmitted.

4. The ultrasonic infrared sensing switch device of claim 1, wherein, The ultrasonic signal receiving circuit comprises an ultrasonic wave receiving probe RX1 and an operational amplifier U8; the ultrasonic wave receiving probe RX1 receives ultrasonic waves and converts the varying ultrasonic waves into a tiny voltage signal which is amplified by the operational amplifier and a band-pass filter and then sent to the low-power control integrated circuit.

5. The ultrasonic infrared sensing switch device of claim 1, wherein, The ambient light detection circuit comprises an ambient light sensor which converts light into a voltage signal and then sends the voltage signal to the low-power control integrated circuit.

6. The ultrasonic infrared sensing switch device of claim 1, wherein, ​ 7. The ultrasonic infrared sensing switch device of claim 1, wherein, The zero-crossing detection circuit comprises resistors R109, R110, R111 and a transistor Q102, the resistors R109, R110 and R111 form a voltage division circuit, and the G electrode of the transistor Q102 is connected with the resistors R110 and R111, when the voltage of the TP108 test point exceeds 0.7V after the zero-crossing point of the alternating voltage 6V, the C electrode and the E electrode of the transistor Q102 are turned on.

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