Touch type control circuit

Abstract

The utility model discloses a touch type control circuit, which comprises a touch sensor circuit, a signal filter circuit, a high-voltage isolation circuit, a control chip MCU (Microprogrammed Control Unit), a lamp H and a power supply filter circuit, and is characterized in that the signal filter circuit is electrically connected with the touch sensor circuit and the high-voltage isolation circuit; the control chip MCU is electrically connected with the touch sensor circuit, the signal filter circuit, the high-voltage isolation circuit, the lamp H and the power supply filter circuit. According to the utility model, through the arrangement of the signal filter circuit, the touch signal can be filtered, shaped and smoothed, the conditions of false triggering and failure caused by electromagnetic interference can be effectively reduced, the use stability is improved, and through the combination of the power supply filter circuit and the high-voltage isolation circuit, the touch signal can be filtered, shaped and smoothed. The low-voltage load and the high-voltage load in the circuit can be effectively isolated, the electric shock risk is avoided, and the use safety is improved.

Description

Technical Field

[0001] This utility model relates to the field of control circuit technology, and in particular to a touch control circuit. Background Technology

[0002] Currently, lighting consumes approximately 20% of total electricity. Reducing lighting consumption is a crucial way to save energy. To achieve this goal, developing and applying new, more efficient, reliable, safe, and durable light sources is imperative. LEDs, due to their high brightness, low heat, long lifespan, non-toxicity, and recyclability, are considered the most promising green lighting source of the 21st century. However, the required light brightness varies depending on the situation. For example, in the morning, the lights can be slightly dimmer to ensure normal activities while saving energy. At night, LEDs require sufficient brightness to ensure people's proper functioning. With frequent activities, meeting people's varying needs for lighting brightness in different situations is an urgent problem to be solved. To address this, application number 201610885431.X discloses a touch-sensitive dimming control circuit, mainly composed of a control chip U, a bidirectional thyristor D4, a touch panel M, a capacitor C1 whose negative terminal is connected to the SP pin of the control chip U via a resistor R3, and whose positive terminal is connected to the touch panel M. This circuit allows users to change the brightness of the lighting by touching the touch panel; the brightness can be dimmed in the morning and brightened at night, thus meeting people's needs in different situations.

[0003] The touch-sensitive dimming control circuit disclosed in the aforementioned patent can change the brightness of a light by touch, but it still has the following shortcomings in use: 1. It lacks the function of preventing electric shock, so there is a risk of electric shock when people touch to control the light; 2. The touch-sensitive dimming control circuit is easily affected by electromagnetic interference (such as radio waves, electromagnetic radiation, household appliances, etc.), which may lead to misoperation or malfunction, resulting in low stability in use; In view of the above, this application proposes a touch-sensitive control circuit. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a touch-sensitive control circuit.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A touch-sensitive control circuit includes a touch sensor circuit, a signal filtering circuit, a high-voltage isolation circuit, a control chip MCU, a lamp H, and a power filtering circuit. The signal filtering circuit is electrically connected to the touch sensor circuit and the high-voltage isolation circuit, and the control chip MCU is electrically connected to the touch sensor circuit, the signal filtering circuit, the high-voltage isolation circuit, the lamp H, and the power filtering circuit.

[0007] Preferably, the touch sensor circuit includes a chip U1, pin 1 of chip U1 is electrically connected to one end of resistor R1, the other end of resistor R1 is electrically connected to a touch electrode M, pin 2 of chip U1 is electrically connected to one end of resistor R2, the other end of resistor R2 is electrically connected to one end of capacitor C1, the other end of capacitor C1 is grounded, pin 6 of chip U1 is electrically connected to one end of resistor R8, the other end of resistor R8 is electrically connected to pin 1 of the control chip MCU.

[0008] Preferably, the signal filtering circuit includes a chip U2. Pin 1 of chip U2 is electrically connected to one end of a resistor R4. Pins 3 and 4 of chip U2 are both electrically connected to the other end of resistor R4. Pins 1 and 2 of chip U2 are electrically connected to one end of a capacitor C2. The other end of capacitor C2 is electrically connected to one end of a resistor R3. The other end of resistor R3 is electrically connected to one end of capacitor C1 and the other end of resistor R2. One end of capacitor C2 is electrically connected to one end of resistor R5. Pin 5 of chip U2 is electrically connected to one end of resistor R6 and one end of capacitor C3. The other ends of resistor R5 and resistor R6 are both grounded. The other end of capacitor C3 is electrically connected to pin 7 of chip U2. Pin 6 of chip U2 is electrically connected to one end of resistor R7. The other end of resistor R7 is electrically connected to one end of capacitor C4. The other end of capacitor C4 is electrically connected to pin 7 of the control chip MCU. Chip U2, resistor R4, resistor R5, resistor R6, and capacitor C3 constitute a Schmitt trigger.

[0009] Preferably, the high-voltage isolation circuit includes an optocoupler chip U3. Pin 1 of the optocoupler chip U3 is electrically connected to one end of a resistor R8. The other end of the resistor R8 is electrically connected to pin 5 of the control chip MCU and pin 6 of chip U2. Pin 2 of the optocoupler chip U3 is grounded. Pin 4 of the optocoupler chip U3 is electrically connected to the anode of diode D1. The cathode of diode D1 is electrically connected to a high-level voltage VCC. Pin 3 of the optocoupler chip U3 is electrically connected to the lamp H. A diode D2 is connected in parallel with the lamp H. The cathode of diode D2 and pin 3 of the optocoupler chip U3 are both grounded. The anode of the lamp H and the anode of diode D2 are both electrically connected to pin 6 of the control chip MCU.

[0010] Preferably, the power supply filtering circuit includes an inductor L, one end of which is electrically connected to a high-level VCC, and the other end of which is grounded. The other end of the inductor L is also electrically connected to one end of a capacitor C5. The other end of the capacitor C5 is electrically connected to one end of a capacitor C7. The other end of the capacitor C7 is electrically connected to one end of a resistor R9 and one end of a capacitor C8. The other end of the capacitor C7 is grounded. The other end of the resistor R9 is electrically connected to one end of a capacitor C6. The other end of the capacitor C6 is electrically connected to pin 3 of the control chip MCU. The other end of the capacitor C8 is electrically connected to pin 4 of the control chip MCU.

[0011] Preferably, the optocoupler chip U3 is model 72HC14, and the high-voltage isolation circuit is used to isolate the low-voltage control circuit from the high-voltage load.

[0012] Preferably, the chip U1 is model SM6124, and the resistor R1 is a pull-down resistor.

[0013] Compared with existing technologies, the beneficial effects of this utility model are:

[0014] This invention, through the setting of a signal filtering circuit, can filter, shape, and smooth touch signals, effectively reducing false triggering and malfunctions caused by electromagnetic interference, improving operational stability. Furthermore, by combining a power filtering circuit and a high-voltage isolation circuit, it can effectively isolate low-voltage and high-voltage loads in the circuit, avoiding the risk of electric shock and improving operational safety. Attached Figure Description

[0015] Figure 1 This is a connection block diagram of a touch control circuit proposed in this utility model;

[0016] Figure 2 A circuit diagram of a touch-sensitive control circuit proposed in this utility model;

[0017] Figure 3 A circuit diagram of a high-voltage isolation circuit for a touch-sensitive control circuit proposed in this utility model;

[0018] Figure 4 The circuit diagram is shown for the power supply filtering circuit of a touch-sensitive control circuit proposed in this utility model. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Reference Figure 1-4A touch-sensitive control circuit includes a touch sensor circuit, a signal filtering circuit, a high-voltage isolation circuit, a control chip MCU, a lamp H, and a power filtering circuit. The signal filtering circuit is electrically connected to the touch sensor circuit and the high-voltage isolation circuit, and the control chip MCU is electrically connected to the touch sensor circuit, the signal filtering circuit, the high-voltage isolation circuit, the lamp H, and the power filtering circuit.

[0021] The touch sensor circuit includes chip U1, model number SM6124. Pin 1 of chip U1 is electrically connected to one end of resistor R1, which is a pull-down resistor. The other end of resistor R1 is electrically connected to the touch electrode M. Pin 2 of chip U1 is electrically connected to one end of resistor R2. The other end of resistor R2 is electrically connected to one end of capacitor C1, and the other end of capacitor C1 is grounded. Pin 6 of chip U1 is electrically connected to one end of resistor R8. The other end of resistor R8 is electrically connected to pin 1 of the control chip MCU.

[0022] The signal filtering circuit includes chip U2. Pin 1 of chip U2 is electrically connected to one end of resistor R4. Pins 3 and 4 of chip U2 are both electrically connected to the other end of resistor R4. Pins 1 and 2 of chip U2 are electrically connected to one end of capacitor C2. The other end of capacitor C2 is electrically connected to one end of resistor R3. The other end of resistor R3 is electrically connected to one end of capacitor C1 and the other end of resistor R2. One end of capacitor C2 is electrically connected to one end of resistor R5. Pin 5 of chip U2 is electrically connected to one end of resistor R6 and one end of capacitor C3. The other ends of resistor R5 and resistor R6 are both grounded. The other end of capacitor C3 is electrically connected to pin 7 of chip U2. Pin 6 of chip U2 is electrically connected to one end of resistor R7. The other end of resistor R7 is electrically connected to one end of capacitor C4. The other end of capacitor C4 is electrically connected to pin 7 of the control chip MCU. Chip U2, resistor R4, resistor R5, resistor R6, and capacitor C3 constitute a Schmitt trigger.

[0023] Capacitor C2 and resistor R3 form a low-pass filter circuit, and resistor R7 and capacitor C4 also form a low-pass filter circuit.

[0024] The high-voltage isolation circuit is used to isolate the low-voltage control circuit from the high-voltage load. The high-voltage isolation circuit includes an optocoupler chip U3, which is model 72HC14. Pin 1 of the optocoupler chip U3 is electrically connected to one end of a resistor R8. The other end of the resistor R8 is electrically connected to pin 5 of the control chip MCU and pin 6 of chip U2. Pin 2 of the optocoupler chip U3 is grounded. Pin 4 of the optocoupler chip U3 is electrically connected to the anode of diode D1. The cathode of diode D1 is electrically connected to the high-level VCC. Pin 3 of the optocoupler chip U3 is electrically connected to the lamp H. A diode D2 is connected in parallel with the lamp H. The cathode of diode D2 and pin 3 of the optocoupler chip U3 are both grounded. The anode of the lamp H and the anode of diode D2 are both electrically connected to pin 6 of the control chip MCU.

[0025] The power supply filtering circuit includes an inductor L, one end of which is electrically connected to a high-level voltage VCC, and the other end of which is grounded. The other end of inductor L is also electrically connected to one end of capacitor C5. The other end of capacitor C5 is electrically connected to one end of capacitor C7. The other end of capacitor C7 is electrically connected to one end of resistor R9 and one end of capacitor C8. The other end of capacitor C7 is grounded. The other end of resistor R9 is electrically connected to one end of capacitor C6. The other end of capacitor C6 is electrically connected to pin 3 of the control chip MCU, and the other end of capacitor C8 is electrically connected to pin 4 of the control chip MCU. This invention, through the setting of the signal filtering circuit, can filter, shape, and smooth the touch signal, effectively reducing false triggering and malfunctions caused by electromagnetic interference, improving operational stability. Furthermore, by combining the power supply filtering circuit with the high-voltage isolation circuit, it can effectively isolate low-voltage and high-voltage loads in the circuit, avoiding the risk of electric shock and improving operational safety.

[0026] Working principle: When a person touches the touch electrode M to adjust the brightness of the lamp H, the touch signal is transmitted to the chip U1. After receiving the touch signal, the chip U1 transmits it to the control chip MCU and the signal filtering circuit. In the signal filtering circuit, resistor R3 and capacitor C2 perform initial filtering on the signal to suppress transient interference. The signal after initial filtering is transmitted to the Schmitt trigger, which shapes the signal. Resistor R7 and capacitor C4 smooth the shaped signal, thereby effectively removing electromagnetic interference from the signal. The signal after filtering out electromagnetic interference is transmitted to the control chip MCU. The control chip MCU processes the filtered signal and controls the lamp H. By filtering, shaping, and smoothing the touch signal, the false triggering and malfunction caused by electromagnetic interference can be effectively reduced, improving the stability of use.

[0027] During use, the device is powered by a power supply, and the power supply filter circuit filters the signals in the power supply. At the same time, the high voltage isolation circuit isolates the low voltage and high voltage loads in the power supply through the setting of the optocoupler chip U3. Through filtering and isolation, the risk of electric shock can be effectively avoided and the safety of use can be improved.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A touch control circuit, characterized by, It includes a touch sensor circuit, a signal filtering circuit, a high-voltage isolation circuit, a control chip MCU, a lamp H, and a power filtering circuit. The signal filtering circuit is electrically connected to the touch sensor circuit and the high-voltage isolation circuit, and the control chip MCU is electrically connected to the touch sensor circuit, the signal filtering circuit, the high-voltage isolation circuit, the lamp H, and the power filtering circuit.

2. The touch control circuit according to claim 1, characterized in that, The touch sensor circuit includes a chip U1. Pin 1 of chip U1 is electrically connected to one end of resistor R1, and the other end of resistor R1 is electrically connected to a touch electrode M. Pin 2 of chip U1 is electrically connected to one end of resistor R2, and the other end of resistor R2 is electrically connected to one end of capacitor C1. The other end of capacitor C1 is grounded. Pin 6 of chip U1 is electrically connected to one end of resistor R8, and the other end of resistor R8 is electrically connected to pin 1 of the control chip MCU.

3. A touch control circuit according to claim 2, wherein, The signal filtering circuit includes chip U2. Pin 1 of chip U2 is electrically connected to one end of resistor R4. Pins 3 and 4 of chip U2 are both electrically connected to the other end of resistor R4. Pins 1 and 2 of chip U2 are electrically connected to one end of capacitor C2. The other end of capacitor C2 is electrically connected to one end of resistor R3. The other end of resistor R3 is electrically connected to one end of capacitor C1 and the other end of resistor R2. One end of capacitor C2 is electrically connected to one end of resistor R5. Pin 5 of chip U2 is electrically connected to one end of resistor R6 and one end of capacitor C3. The other ends of resistor R5 and resistor R6 are both grounded. The other end of capacitor C3 is electrically connected to pin 7 of chip U2. Pin 6 of chip U2 is electrically connected to one end of resistor R7. The other end of resistor R7 is electrically connected to one end of capacitor C4. The other end of capacitor C4 is electrically connected to pin 7 of control chip MCU. Chip U2, resistors R4, R5, R6, and capacitor C3 constitute a Schmitt trigger.

4. A touch control circuit according to claim 3, wherein, The high-voltage isolation circuit includes an optocoupler chip U3. Pin 1 of the optocoupler chip U3 is electrically connected to one end of a resistor R8. The other end of the resistor R8 is electrically connected to pin 5 of the control chip MCU and pin 6 of chip U2. Pin 2 of the optocoupler chip U3 is grounded. Pin 4 of the optocoupler chip U3 is electrically connected to the anode of diode D1. The cathode of diode D1 is electrically connected to a high-level voltage VCC. Pin 3 of the optocoupler chip U3 is electrically connected to a lamp H. A diode D2 is connected in parallel with the lamp H. The cathode of diode D2 and pin 3 of the optocoupler chip U3 are both grounded. The anode of the lamp H and the anode of diode D2 are both electrically connected to pin 6 of the control chip MCU.

5. A touch control circuit according to claim 1, wherein, The power supply filtering circuit includes an inductor L, one end of which is electrically connected to a high-level voltage VCC, and the other end of which is grounded. The other end of the inductor L is also electrically connected to one end of a capacitor C5. The other end of the capacitor C5 is electrically connected to one end of a capacitor C7. The other end of the capacitor C7 is electrically connected to one end of a resistor R9 and one end of a capacitor C8. The other end of the capacitor C7 is grounded. The other end of the resistor R9 is electrically connected to one end of a capacitor C6. The other end of the capacitor C6 is electrically connected to pin 3 of the control chip MCU. The other end of the capacitor C8 is electrically connected to pin 4 of the control chip MCU.

6. A touch control circuit according to claim 4, wherein, The optocoupler chip U3 is model 72HC14, and the high-voltage isolation circuit is used to isolate the low-voltage control circuit from the high-voltage load.

7. A touch control circuit according to claim 2, wherein, The chip U1 is model SM6124, and resistor R1 is a pull-down resistor.

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