Anti-interference touch type lamp control circuit
By introducing a ground terminal and isolation capacitor into the touch-sensitive lighting control circuit, and combining a microcontroller unit and a transistor-controlled MOSFET, the problem of interference on the touch line is solved, achieving stable touch signal transmission and reliable switching and dimming effects for the bulb.
Patent Information
- Application Number
- CN202520412398.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2026-03-06
- Estimated Expiration
- 2035-03-11
AI Technical Summary
The touch line is susceptible to interference from surrounding power lines, signal lines, and other sources, which can lead to unstable control signals and affect the accuracy and sensitivity of the control.
The design employs a grounding terminal and isolation capacitor, combined with the control of a microcontroller unit and a MOSFET. The isolation capacitor shields interference signals, and the microcontroller unit calculates the load power to stabilize the touch signal. The transistor controls the conduction time of the MOSFET to achieve the switching and dimming of the bulb.
It effectively shields external interference, improves the stability of touch signal transmission and the accuracy of control, and realizes reliable switching and dimming functions for the bulb.
Smart Images
Figure CN223978788U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lighting control technology, specifically to an anti-interference touch-sensitive lighting control circuit. Background Technology
[0002] Touch-sensitive lighting control circuits are control circuits based on capacitive or resistive sensing. Compared with traditional mechanical switches, touch-sensitive lighting control achieves the switching control of lights by touching sensors, and has the characteristics of no physical contact, fast response, and easy operation.
[0003] However, the layout of the touch cable is susceptible to interference from surrounding power lines, signal lines, and other sources of interference. This interference can cause instability in the touch control signal, thereby affecting the accuracy and sensitivity of the control. For example, when the touch cable is laid parallel to an AC cable, electromagnetic interference from the AC signal may introduce noise, leading to false triggering or failure to respond. Utility Model Content
[0004] This utility model provides an anti-interference touch-sensitive lighting control circuit, which can overcome the defect in the prior art where the touch line is easily affected by external cable interference, resulting in poor control stability.
[0005] According to the anti-interference touch-sensitive lighting control circuit of this utility model, it includes a power input port CON1, a non-isolated power supply U1 connected to the power input port, a microcontroller U3 connected to the non-isolated power supply U1, a touch port CON3 and a MOSFET Q2 connected to the microcontroller U3, the touch port CON3 is for user touch, the touch port CON3 has a ground terminal, the MOSFET Q2 is connected to a rectifier bridge BD1, the rectifier bridge BD1 is connected to a series-connected bulb CON2, and the series-connected bulb CON2 is also connected to the power input port CON1.
[0006] In a preferred embodiment of this utility model, the touch port CON3 is connected to the PA2 terminal of the microcontroller U3, and an isolation capacitor CY1 is connected between the touch port CON3 and the PA2 terminal of the microcontroller U3.
[0007] In a preferred embodiment of this utility model, an isolation capacitor CY2 is provided at the grounding terminal of the touch port CON3.
[0008] In a preferred embodiment of this utility model, the AC terminal of the non-isolated power supply is connected to the PA3 terminal of the microcontroller U3, and the PB3 terminal of the microcontroller U3 is connected to the rectifier bridge BD1.
[0009] In a preferred embodiment of this utility model, the AC terminal of the non-isolated power supply is connected to the PA3 terminal of the microcontroller U3 by resistors R9 and R13.
[0010] In a preferred embodiment of this utility model, a transistor Q4 is connected to the PB6 terminal of the microcontroller unit U3. The collector of transistor Q4 is connected to the VO terminal of the non-isolated power supply U1. The emitter of transistor Q4 is grounded. Transistors Q3 and Q1 are connected between the collector of transistor Q4 and the VO terminal of the non-isolated power supply U1. The base of transistor Q1 is connected to the collector of transistor Q4. The collector of transistor Q1 is connected to the VO terminal of the non-isolated power supply U1. The emitter of transistor Q1 is connected to the emitter of transistor Q3. The base of transistor Q3 is connected to the collector of transistor Q4. The collector of transistor Q3 and the emitter of transistor Q4 share a common ground. MOSFET Q2 is connected to the emitters of transistors Q1 and Q3.
[0011] In a preferred embodiment of this utility model, transistors Q1 and Q4 are NPN transistors, and transistor Q3 is a PNP transistor.
[0012] Beneficial effects:
[0013] First, by setting a ground terminal at the touch port CON3, electromagnetic interference from other cables to the touch port CON3 can be effectively shielded, thereby improving the transmission stability of the touch signal at the touch port CON3.
[0014] Second, by outputting high and low level square wave signals through the PB6 terminal of the microcontroller unit U3, the conduction time of the MOSFET Q2 is changed, thereby changing the power of the series bulb CON2, and thus realizing the switching and dimming of the series bulb CON2. Attached Figure Description
[0015] Figure 1 This is a structural block diagram of an anti-interference touch-sensitive lighting control circuit in at least one embodiment of this application;
[0016] Figure 2 This is a circuit diagram of an anti-interference touch-sensitive lighting control circuit in at least one embodiment of this application. Detailed Implementation
[0017] Seen in Figure 1 and Figure 2 This utility model provides an anti-interference touch-sensitive lighting control circuit, which includes a power input port CON1, a non-isolated power supply U1 connected to the power input port, a microcontroller U3 connected to the non-isolated power supply U1, a touch port CON3 and a MOSFET Q2 connected to the microcontroller U3, and the touch port CON3 is used for user touch.
[0018] Specifically, the power input port CON1 is used to connect to external AC power, and the non-isolated power supply U1 is used to connect to external AC power and supply power to the microcontroller U3 and the series bulb CON2, thereby driving both. The microcontroller U3 is used to detect the phase angle of the non-isolated power supply U1 and the touch signal of the touch port CON3, and then calculates the active power of the current load based on the current working state of the series bulb CON2. After that, the control signal is calculated by the touch signal and the phase angle of the non-isolated power supply U1, and the control signal is sent to the MOSFET Q2 to control the active power value of the series bulb CON2, that is, to control the brightness of the series bulb CON2.
[0019] In the above embodiment, the touch port CON3 has a ground terminal, so the interference signal at the touch port CON3 can be effectively shielded, thereby ensuring stable communication between the touch port CON3 and the microcontroller unit U3.
[0020] In addition, MOSFET Q2 is connected to rectifier bridge BD1, rectifier bridge BD1 is connected to series bulb CON2, and series bulb CON2 is also connected to power input port CON1. The rectifier bridge BD1 is used to convert the AC power input from non-isolated power supply U1 into DC power to drive series bulb CON2.
[0021] The touch port CON3 is connected to the PA2 terminal of the microcontroller unit U3. The PA2 terminal can recognize the touch signals, including long press and short press signals.
[0022] In the above embodiment, an isolation capacitor CY1 is connected between the touch port CON3 and the PA2 terminal of the microcontroller U3. The high impedance of the isolation capacitor CY1 to the DC signal can effectively isolate noise and improve the stability of the touch signal input to the PA2 port of the microcontroller.
[0023] In addition, an isolation capacitor CY2 is provided at the grounding terminal of the touch port CON3 to reduce interference from external cables to the touch signal at the touch port CON3.
[0024] In some embodiments, the AC terminal of the non-isolated power supply is connected to the PA3 terminal of the microcontroller U3, and the PB3 terminal of the microcontroller U3 is connected to the rectifier bridge BD1.
[0025] Specifically, the PA3 terminal of the microcontroller U3 is used to sample the AC voltage at the non-isolated power supply AC terminal, and the PB3 terminal of the microcontroller U3 is used to sample the load current of the series-connected bulb CON2. The active power value of the load is then calculated by the microcontroller U3. The specific calculation steps are as follows:
[0026] S1: Voltage or current is sampled once every 100us in one cycle, for a total of 100 samples within half a wavelength.
[0027] S2: Let the voltage of the j-th sample be U_j, and the current of the j-th sample be I_j. Calculate the average power of the above 100 sampling processes using the following formula:
[0028]
[0029] In addition, resistors R9 and R13 are connected to the AC terminal of the non-isolated power supply U1 and the PA3 terminal of the microcontroller U3. Resistors R9 and R13 are used for voltage division, thereby reducing the voltage input to the microcontroller U3.
[0030] In some embodiments, a transistor Q4 is connected to the PB6 terminal of the microcontroller unit U3. The collector of transistor Q4 is connected to the VO terminal of the non-isolated power supply U1. The emitter of transistor Q4 is grounded. Transistors Q3 and Q1 are connected between the collector of transistor Q4 and the VO terminal of the non-isolated power supply U1. The base of transistor Q1 is connected to the collector of transistor Q4. The collector of transistor Q1 is connected to the VO terminal of the non-isolated power supply U1. The emitter of transistor Q1 is connected to the emitter of transistor Q3. The base of transistor Q3 is connected to the collector of transistor Q4. The collector of transistor Q3 and the emitter of transistor Q4 share a common ground. MOSFET Q2 is connected to the emitters of transistors Q1 and Q3.
[0031] Specifically, in use, since the driving capability of the microcontroller U3 is insufficient to drive the MOSFET Q2, the MOSFET Q2 is controlled by three transistors Q1, Q3 and Q4. Among them, transistors Q1 and Q4 are NPN transistors, and transistor Q3 is a PNP transistor.
[0032] When the output of the PB6 terminal of the microcontroller unit U3 is high, transistor Q4 is turned on, and the bases of transistors Q3 and Q1 are low. At this time, transistor Q3 is turned on and transistor Q1 is turned off. At this time, the collector of MOSFET Q2 is low, so MOSFET Q2 is turned on, and the load connected in series with the bulb CON2 lights up.
[0033] When the output of PB6 terminal of microcontroller U3 is low, transistor Q4 is cut off, and the base of transistors Q3 and Q1 is high. At this time, transistor Q3 is cut off and transistor Q1 is turned on. At this time, the collector of MOSFET Q2 is high, so MOSFET Q2 is cut off, and the bulb CON2 connected in series with the load is turned off.
[0034] When the series-connected bulb needs to be dimmed, the microcontroller U3 outputs a high or low level square wave signal at its PB6 terminal, which changes the conduction time of the MOSFET Q2, thereby changing the power of the series-connected bulb CON2.
[0035] Specifically, the duty cycle of the square wave (the ratio of the high-level duration to the total period time) determines the conduction time of Q2, thus affecting the brightness of the bulb. An increase in the high-level duty cycle increases the conduction time of Q2 and improves the brightness of the bulb; conversely, a decrease in the high-level duty cycle decreases the conduction time of Q2 and reduces the brightness of the bulb.
[0036] The above control method can not only turn the light bulb on and off, but also adjust the brightness of the light bulb within a controllable range to achieve a dimming effect.
[0037] It is readily understood that those skilled in the art can combine, split, or reorganize the embodiments provided in this application to obtain other embodiments, all of which do not exceed the protection scope of this application.
Claims
1. An interference-resistant touch-controlled light circuit, characterized in that The power input port CON1 is connected with the non-isolated power supply U1, the non-isolated power supply U1 is connected with the micro control unit U3, the micro control unit U3 is connected with the touch port CON3 and the MOS tube Q2 respectively, the touch port CON3 is used for the user to touch, the touch port CON3 has a grounding end, the MOS tube Q2 is connected with the rectifier bridge BD1, the rectifier bridge BD1 is connected with the series bulb CON2, and the series bulb CON2 is also connected with the power input port CON1.
2. The tamper-resistant touch operated lamp control circuit of claim 1, wherein, The touch port CON3 is connected with the PA2 end of the micro control unit U3, and the touch port CON3 and the PA2 end of the micro control unit U3 are connected with the isolation capacitor CY1.
3. The tamper-resistant touch operated lamp control circuit of claim 1, wherein, The grounding end of the touch port CON3 is provided with the isolation capacitor CY2.
4. The tamper-resistant touch operated lamp control circuit of claim 1, wherein, The AC end of the non-isolated power supply is connected with the PA3 end of the micro control unit U3, and the PB3 end of the micro control unit U3 is connected with the rectifier bridge BD1.
5. The tamper-resistant touch operated lamp control circuit of claim 4, wherein, The AC end of the non-isolated power supply is connected with the PA3 end of the micro control unit U3 through the resistor R9 and the resistor R13.
6. The tamper-resistant touch operated lamp control circuit of claim 1, wherein, The PB6 end of the micro control unit U3 is connected with the triode Q4, the collector of the triode Q4 is connected with the VO end of the non-isolated power supply U1, the emitter of the triode Q4 is grounded, the collector of the triode Q4 is connected with the triode Q3 and the triode Q1 between the VO end of the non-isolated power supply U1, the base of the triode Q1 is connected with the collector of the triode Q4, the collector of the triode Q1 is connected with the VO end of the non-isolated power supply U1, the emitter of the triode Q1 is connected with the emitter of the triode Q3, the base of the triode Q3 is connected with the collector of the triode Q4, the collector of the triode Q3 and the emitter of the triode Q4 are grounded, and the MOS tube Q2 is connected with the emitter of the triode Q1 and the emitter of the triode Q3.
7. The tamper-resistant touch operated lamp control circuit of claim 6, wherein, The triode Q1 and the triode Q4 are NPN type triodes, and the triode Q3 is a PNP type triode.