A control circuit for two-wire signal transmission using negative voltage power supply

Abstract

The present invention discloses a two-wire signal transmission control circuit using negative voltage power supply. The control circuit includes an AC half-wave rectifier negative voltage output circuit connected to a low-voltage AC power supply and used for power supply, a detection circuit, and a WIFI module control circuit. A negative voltage level conversion and signal mutual transmission circuit is connected between the MCU control circuit and the WIFI module control circuit, and is used for enabling the MCU control circuit to receive remote control signals and the WIFI module control circuit to receive feedback signals. The MCU control circuit is connected to a high-power drive output and signal transmission circuit for transmitting control instructions converted from the remote control signal and a synchronously received detection power supply signal to a load. By driving a thyristor by negative voltage power supply, the function of long-distance transmission of weak current signals can be realized, and power can also be well output to the load part, thereby solving the problem of simultaneously performing low-voltage signal transmission and high-power load output on two unified output lines.

Description

[Technical field]

[0001] The invention relates to a two-wire signal transmission control circuit using negative voltage power supply. [Background Technology]

[0002] Traditionally, household appliances have been powered by high voltages, such as 220VAC or 120VAC, derived from the mains. When connected to high-power loads, the required current is significantly lower than that required by devices with low-voltage input and high-power output, making it easier to manage electronically. Furthermore, a control system typically consisted of one load output line and one control signal line, making wiring complex and difficult to assemble, and resulting in a waste of resources. Furthermore, for low-voltage control devices such as LED lamps or other low-voltage drive devices requiring high-power, low-voltage AC power, the ideal power transistor is the thyristor (SCR). Previous circuit designs have drawn power from positive voltage sources, but optocoupler-based isolated drivers can easily result in incomplete conduction of the SCR, meaning that signal segmentation is unclear. Consequently, the signal transmitted to the LED driver board is unclear and incomplete, sometimes leading to misjudgment by the LED, resulting in a lighting effect significantly different from the intended one. This problem is particularly pronounced over long-distance cable transmission. [Summary of the invention]

[0003] The present invention overcomes the shortcomings of the above-mentioned technology and provides a control circuit for two-wire signal transmission using negative voltage power supply.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A control circuit for two-wire signal transmission using negative voltage power supply is characterized by comprising an AC half-wave rectifier negative voltage output circuit connected to a low-voltage AC power supply for outputting a negative voltage after AC half-wave rectification, a detection circuit connected to the low-voltage AC power supply for detecting a power supply signal, and a WIFI module control circuit for transmitting signals to a remote control terminal. The detection circuit is connected to an MCU control circuit. A negative voltage level conversion and signal transmission circuit is connected between the MCU control circuit and the WIFI module control circuit, for enabling the MCU control circuit to receive remote control signals and for enabling the WIFI module control circuit to receive feedback signals. The MCU control circuit is connected to a high-power drive output and signal transmission circuit for converting a remote control signal and a synchronously received detected power supply signal into a control instruction and transmitting it to a load. The AC half-wave rectifier negative voltage output circuit supplies power to the MCU control circuit, the power supply signal detection circuit, the WIFI module control circuit, and the negative voltage level conversion and signal transmission circuit, respectively.

[0006] The control circuit of a two-wire signal transmission using negative voltage power supply as described above is characterized in that: the AC half-wave rectifier negative voltage output circuit includes a rectifier chip U3, pin 1 of the rectifier chip U3 is grounded, pin 2 of the rectifier chip U3 is respectively connected to one end of capacitor C9, the negative end of electrolytic capacitor C1, the negative end of electrolytic capacitor C1-1, and the positive end of diode D4 through resistor R13, the negative end of diode D4 is connected to the J2 end of the low-voltage AC power supply, the other end of capacitor C9, the positive end of electrolytic capacitor C1, and the positive end of electrolytic capacitor C1-1 are respectively grounded, pin 3 of the rectifier chip U3 is respectively connected to the negative end of electrolytic capacitor C2 and one end of capacitor C12, the positive end of electrolytic capacitor C2 and the other end of capacitor C12 are grounded, and pin 3 of the rectifier chip U3 outputs a -5V voltage.

[0007] The control circuit for two-wire signal transmission using negative voltage power supply as described above is characterized in that: the detection circuit includes a photocoupler U4, pin 1 of the photocoupler U4 is respectively connected to one end of the capacitor C7 and one end of the resistor R44, the other end of the resistor R44 is connected to the negative end of the diode D1 through the resistor R5, the positive end of the diode D1 is connected to the J1 end of the low-voltage AC power supply through F1, pin 2 of the photocoupler U4 is respectively connected to the other end of the capacitor C7 and one end of the resistor R9, the other end of the resistor R9 is connected to the J2 end of the low-voltage AC power supply, pin 3 of the photocoupler U4 is grounded, pin 4 of the photocoupler U4 is respectively connected to one end of the resistor R7 and the base of the transistor Q1 through the resistor R6, the other end of the resistor R7, the emitter of the transistor Q1, and one end of the capacitor C5 are respectively connected to the -5V voltage, the collector of the transistor Q1 is respectively connected to one end of the resistor R2, the other end of the capacitor C5, and the MCU control circuit, and the other end of the resistor R2 is grounded.

[0008] The control circuit for two-wire signal transmission using negative voltage power supply as described above is characterized in that: the WIFI module control circuit includes a WIFI control chip U7, pin 1 of the WIFI control chip U7 is respectively connected to one end of a resistor R56 and one end of a capacitor C22, the other end of the resistor R56 is grounded, the other end of the capacitor C22 is respectively connected to one end of a resistor R55 and pin 3 of the WIFI control chip U7 through a capacitor C17, the other end of the resistor R55 is grounded, pin 8 of the WIFI control chip U7, one end of a capacitor C25, and one end of a capacitor C35 are respectively grounded, the other end of the capacitor C25 and the other end of the capacitor C35 are respectively connected to a -5V voltage, pin 9 of the WIFI control chip U7 is connected to a -5V voltage, pin 15 of the WIFI control chip U7 is connected to a negative voltage level conversion and signal mutual transmission circuit through a resistor R52, pin 16 of the WIFI control chip U7 is respectively connected to one end of a resistor R53 and one end of a resistor R51, the other end of the resistor R53 is connected to a -5V voltage, and the other end of the resistor R51 is connected to the negative voltage level conversion and signal mutual transmission circuit.

[0009] The control circuit for two-wire signal transmission using negative voltage power supply as described above is characterized in that: the MCU control circuit includes a control chip U6, pin 1 of the control chip U6, one end of the capacitor C8, and one end of the capacitor C15 are respectively connected to a -5V voltage, pin 3 of the control chip U6 is respectively connected to the other end of the capacitor C8, the other end of the capacitor C15, and one end of the resistor R45, the other end of the resistor R45 and the positive end of the electrolytic capacitor C13 are respectively grounded, the negative end of the electrolytic capacitor C13 is connected to a -5V voltage, pin 4 of the control chip U6 is connected to a detection circuit, pin 6 of the control chip U6 is connected to a high-power drive output and signal transmission circuit, pin 21 of the control chip U6 is connected to a control center work indication circuit, pins 23-24 of the control chip U6 are connected to a negative voltage level conversion and signal mutual transmission circuit, pin 26 of the control chip U6 is respectively connected to one end of the resistor R61 and one end of the capacitor C61, the other end of the resistor R61 is grounded, and the other end of the capacitor C61 is connected to a -5V voltage, and pin 26 of the control chip U6 is connected to a reset test point.

[0010] The control circuit of a two-wire signal transmission using negative voltage power supply as described above is characterized in that: the negative voltage level conversion and signal mutual transmission circuit includes a transistor Q7 and a transistor Q8, the emitter of the transistor Q7 is connected to the MCU control circuit, the base of the transistor Q7 is respectively connected to one end of the resistor R37 and one end of the capacitor C27, the other end of the resistor R37 is respectively connected to the other end of the capacitor C27, one end of the resistor R36, the negative end of the voltage regulator diode ZD3, one end of the resistor R25, one end of the resistor R24, one end of the resistor R39, and the capacitor One end of C28 is connected, the collector of the transistor Q7 is respectively connected to the other end of the resistor R36 and the WIFI module control circuit, the other end of the resistor R24 is grounded, the positive end of the voltage regulator diode ZD3 and the other end of the resistor R24 are respectively connected to the -5V voltage, the emitter of the transistor Q8 is connected to the WIFI module control circuit, the base of the transistor Q8 is respectively connected to the other end of the resistor R39 and the other end of the capacitor C28, the collector of the transistor Q8 is respectively connected to one end of the resistor R38 and the MCU control circuit, and the other end of the resistor R38 is grounded.

[0011] The control circuit for two-wire signal transmission using negative voltage power supply as described above is characterized in that: the high-power drive output and signal transmission circuit includes a transistor Q2, the base of the transistor Q2 is respectively connected to one end of a resistor R20 and one end of a resistor R19, the other end of the resistor R19 is respectively connected to the MCU control circuit, the emitter of the transistor Q2 and the other end of the resistor R20 are respectively connected to a -5V voltage, the collector of the transistor Q2 is respectively connected to one end of a resistor R12 and a control end of a thyristor TRIAC1 through a resistor R32, the other end of the resistor R12 is respectively connected to the cathode end of the thyristor TRIAC1 and to the J1 end of a low-voltage AC power supply through F1, the anode end of the thyristor TRIAC1 is respectively connected to one end of a resistor R26, one end of a capacitor C22, and an output terminal J4, the other end of the resistor R26 is respectively connected to the other end of the capacitor C22, the J2 end of the low-voltage AC power supply, and the output terminal J3, and the output terminals J3 and J4 are respectively connected to a load.

[0012] The control circuit for two-wire signal transmission using negative voltage power supply as described above is characterized in that: an AC power input indication circuit for indicating AC power input is connected to both ends of the low-voltage AC power supply, and the AC power input indication circuit includes an indicator light LED1, wherein the cathode end of the indicator light LED1 is connected to the J2 end of the low-voltage AC power supply, the anode end of the indicator light LED1 is connected to the cathode end of the diode D3 via resistors R4 and R3 in sequence, and the anode end of the diode D3 is connected to the J1 end of the low-voltage AC power supply via F1.

[0013] The control circuit of the two-wire signal transmission using negative voltage power supply as described above is characterized in that: the MCU control circuit is connected to a control center work indication circuit for indicating the operation of the MCU control circuit, and the control center work indication circuit includes an indicator light LED3, the positive terminal of the indicator light LED3 is connected to the MCU control circuit through a resistor R31, and the negative terminal of the indicator light LED3 is connected to -5V.

[0014] The control circuit for two-wire signal transmission using negative voltage power supply as described above is characterized in that: the high-power drive output and signal transmission output circuit is connected to a load input indication circuit for indicating the operation of the high-power drive output and signal transmission output circuit, and the load input indication circuit includes an indicator light LED2, the cathode end of the indicator light LED2 is connected to the J4 end of the high-power drive output and signal transmission output circuit, the anode end of the indicator light LED2 is connected to the cathode end of the diode D11 through the resistor R11, and the anode point of the diode D11 is connected to the J2 end of the low-voltage AC power supply.

[0015] The beneficial effects of the present invention are:

[0016] The present invention drives the thyristor by taking power from a negative voltage, thereby realizing the function of long-distance transmission of weak current signals. At the same time, it can also effectively output power to the load part, solving the problem of simultaneous low-voltage signal transmission and high-power load output on two unified output lines. The present invention provides a negative voltage level conversion and signal mutual transmission circuit, solving the problem of inconsistent power supply between the WIFI module control circuit and the MCU control circuit under the condition of negative voltage power supply, resulting in the inability to achieve mutual signal transmission. [Brief Description of the Drawings]

[0017] Figure 1 This is a schematic diagram of the present invention;

[0018] Figure 2 This is a circuit diagram of the low-voltage AC power supply and AC half-wave rectification negative voltage output of the present invention;

[0019] Figure 3 Detection circuit diagram of the present invention;

[0020] Figure 4 This is the WIFI module control circuit diagram of the present invention;

[0021] Figure 5 This is a negative voltage level conversion and signal transmission circuit diagram of the present invention;

[0022] Figure 6 MCU control circuit diagram of the present invention;

[0023] Figure 7 This is a diagram of the high-power drive output and signal transmission circuit and the load input indication circuit of the present invention;

[0024] Figure 8 This is the AC power input indication circuit diagram of the present invention;

[0025] Figure 9 This is the working indication circuit diagram of the control center of the present invention. [Specific implementation method]

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings.

[0027] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, the descriptions of "preferred", "sub-preferred", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "preferred" or "sub-preferred" may explicitly or implicitly include at least one such feature.

[0028] like Figure 1-9 As shown, a control circuit for two-wire signal transmission using negative voltage power supply includes an AC half-wave rectifier negative voltage output circuit 1 connected to a low-voltage AC power supply for outputting a negative voltage after AC half-wave rectification, a detection circuit 2 connected to the low-voltage AC power supply for detecting a power supply signal, and a WIFI module control circuit 3 for transmitting signals to a remote control terminal. The detection circuit 2 is connected to an MCU control circuit 4. A negative voltage level conversion and signal mutual transmission circuit 5 is connected between the MCU control circuit 4 and the WIFI module control circuit 3, for enabling the MCU control circuit 4 to receive a remote control signal and enabling the WIFI module control circuit 3 to receive a feedback signal. The MCU control circuit 4 is connected to a high-power drive output and signal transmission circuit 6 for converting a remote control signal and a synchronously received detection power supply signal into a control instruction and sending it to a load. The AC half-wave rectifier negative voltage output circuit 1 supplies power to the MCU control circuit 4, the power supply signal detection circuit 2, the WIFI module control circuit 3, and the negative voltage level conversion and signal mutual transmission circuit 5, respectively.

[0029] Among them, the two ends of the low-voltage AC power supply are connected to an AC power input indication circuit 7 for indicating the AC power input, the MCU control circuit 4 is connected to a control center work indication circuit 8 for indicating the operation of the MCU control circuit 4, and the high-power drive output and signal transmission circuit 6 is connected to a load input indication circuit 9 for indicating the operation of the high-power drive output and signal transmission circuit 6.

[0030] When a low-voltage AC power supply is input, the AC half-wave rectifier negative voltage output circuit 1 performs half-wave rectification and outputs a negative voltage. It then supplies power to the MCU control circuit 4, the power signal detection circuit 2, the WIFI module control circuit 3, and the negative voltage level conversion and signal transmission circuit 5, respectively. This provides power to the entire working circuit, allowing the system to operate at the same stable and reliable voltage level and level conversion.

[0031] When there is a low-voltage AC power input, the detection circuit 2 transmits the detected power signal to the MCU control circuit 4; after receiving the remote control signal sent by a remote control terminal such as a mobile phone or a 2.4G remote control, the WIFI module control circuit 3 transmits the relevant remote control signal to the MCU control circuit 4 through the negative voltage level conversion and signal mutual transmission circuit 5. At this time, the MCU control circuit 4 makes a judgment based on the received remote control signal and the synchronously received power signal and outputs the control instruction to the high-power drive output and signal transmission circuit 6, thereby turning on the power tube in the high-power drive output and signal transmission circuit 6, providing low-voltage AC power to the load. At the same time, through a section of low-voltage AC power switching, the power supply and related control instructions are output to the LED load or other low-voltage controller, providing the load with sufficient low-voltage power supply and reliable control instruction signal transmission, and the load part performs relevant actions according to the relevant control instructions received. For example, it is used in places such as stages, conference halls, dance halls, banquet halls, courtyards, etc. where a variety of low-voltage high-power LEDs are used. Low-voltage high-power LEDs can be dimmed, adjusted in color, and controlled for scene changes. At the same time, other loads can also be controlled, such as the operation changes, gear speed changes, forward and reverse changes, natural wind changes, or timing control of low-voltage motors, etc., depending on the specific needs of the low-voltage high-power loads.

[0032] When the MCU control circuit 4 transmits the control instruction to the load, the MCU control circuit 4 synchronously sends the feedback signal to the WIFI module control circuit 3 through the negative voltage level conversion and signal mutual transmission circuit 5, and then feeds back to the remote control terminal through the WIFI module control circuit 3.

[0033] On the other hand, when there is a low-voltage AC power input, the indicator light of the AC power input indication circuit 7 will light up, indicating that the power input is normal; the indicator light of the control center work indication circuit 8 will light up when the MCU control circuit 4 is working, and flash when transmitting or receiving a signal; the indicator light of the load input indication circuit 9 will light up when the power tube in the high-power drive output and signal transmission circuit 6 is turned on and there is load power output, indicating that the output circuit is working normally.

[0034] like Figure 2As shown, the AC half-wave rectifier negative voltage output circuit 1 includes a rectifier chip U3, the rectifier chip U3 pin 1 is grounded, the rectifier chip U3 pin 2 is connected to one end of the capacitor C9, the negative end of the electrolytic capacitor C1, the negative end of the electrolytic capacitor C1-1, and the positive end of the diode D4 through the resistor R13, the negative end of the diode D4 is connected to the J2 end of the low-voltage AC power supply, the other end of the capacitor C9, the positive end of the electrolytic capacitor C1, and the positive end of the electrolytic capacitor C1-1 are grounded respectively, and the rectifier chip U3 pin 3 is connected to the negative end of the electrolytic capacitor C2 respectively. The positive terminal of electrolytic capacitor C2 and one end of capacitor C12 are connected, the positive terminal of electrolytic capacitor C2 and the other end of capacitor C12 are grounded, and pin 3 of rectifier chip U3 outputs -5V voltage; the voltage of low-voltage AC power input is AC half-wave rectified through diode D4, electrolytic capacitor C1-1, electrolytic capacitor C1, capacitor C9, resistor R13, and rectifier chip U3 to output -5V voltage, which respectively supplies power to MCU control circuit 4, power signal detection circuit 2, WIFI module control circuit 3 and negative voltage level conversion and signal mutual transmission circuit 5.

[0035] like Figure 3 As shown, the detection circuit 2 includes a photocoupler U4, wherein pin 1 of the photocoupler U4 is respectively connected to one end of the capacitor C7 and one end of the resistor R44, the other end of the resistor R44 is connected to the negative end of the diode D1 through the resistor R5, and the positive end of the diode D1 is connected to the J1 end of the low-voltage AC power supply through F1, and pin 2 of the photocoupler U4 is respectively connected to the other end of the capacitor C7 and one end of the resistor R9, and the other end of the resistor R9 is connected to the J2 end of the low-voltage AC power supply, and pin 3 of the photocoupler U4 is grounded, and pin 4 of the photocoupler U4 is respectively connected to one end of the resistor R7 and the base of the transistor Q1 through the resistor R6, the other end of the resistor R7, the emitter of the transistor Q1, and one end of the capacitor C5 are respectively connected to the -5V voltage, and the collector of the transistor Q1 is respectively connected to one end of the resistor R2, the other end of the capacitor C5, and the MCU control circuit 4, and the other end of the resistor R2 is grounded. When the low-voltage AC power supply has power input, the input power is isolated, coupled, and amplified by the optocoupler U4 and then output. At this time, the transistor Q1 is turned on and the detection signal is accurately sent to the MCU control circuit 4.

[0036] like Figure 4As shown, the WIFI module control circuit 3 includes a WIFI control chip U7, the WIFI control chip U7 pin 1 is respectively connected to one end of the resistor R56 and one end of the capacitor C22, the other end of the resistor R56 is grounded, the other end of the capacitor C22 is respectively connected to one end of the resistor R55 and the WIFI control chip U7 pin 3 through the capacitor C17, the other end of the resistor R55 is grounded, the WIFI control chip U7 pin 8, one end of the capacitor C25, and one end of the capacitor C35 are respectively grounded, the other end of the capacitor C25 and the other end of the capacitor C35 are respectively connected to the -5V voltage, the WIFI control chip U7 pin 9 is connected to the -5V voltage, the WIFI control chip U7 pin 15 is connected to the negative voltage level conversion and signal mutual transmission circuit 5 through the resistor R52, the WIFI control chip U7 pin 16 is respectively connected to one end of the resistor R53 and one end of the resistor R51, the other end of the resistor R53 is connected to the -5V voltage, and the other end of the resistor R51 is connected to the negative voltage level conversion and signal mutual transmission circuit 5. After the WIFI control chip U7 receives the remote control signal from the remote control terminal, it is sent to the negative voltage level conversion and signal mutual transmission circuit 5 through the WIFI control chip U7 pin 16, and then transmitted to the MCU control circuit 4; similarly, the feedback signal of the MCU control circuit 4 passes through the negative voltage level conversion and signal mutual transmission circuit 5, is received through the WIFI control chip U7 pin 15, and then wirelessly fed back to the remote control terminal via WIFI.

[0037] like Figure 6 As shown, the MCU control circuit 4 includes a control chip U6, a pin 1 of the control chip U6, one end of the capacitor C8, and one end of the capacitor C15 are respectively connected to a -5V voltage, a pin 3 of the control chip U6 is respectively connected to the other end of the capacitor C8, the other end of the capacitor C15, and one end of the resistor R45, the other end of the resistor R45 and the positive end of the electrolytic capacitor C13 are respectively grounded, and the negative end of the electrolytic capacitor C13 is connected to a -5V voltage, a pin 4 of the control chip U6 is connected to the detection circuit 2, a pin 6 of the control chip U6 is connected to the high-power drive output and signal transmission circuit 6, a pin 21 of the control chip U6 is connected to the control center work indication circuit 8, pins 23-24 of the control chip U6 are connected to the negative voltage level conversion and signal mutual transmission circuit 5, a pin 26 of the control chip U6 is respectively connected to one end of the resistor R61 and one end of the capacitor C61, the other end of the resistor R61 is grounded, and the other end of the capacitor C61 is connected to a -5V voltage, and a pin 26 of the control chip U6 is connected to a reset test point. The detection power supply signal of the detection circuit 2 is received through the control chip U6 pin 4, and the remote control signal is received through the control chip U6 pin 24. At the same time, the control instructions converted from the received remote control signal and the synchronously received detection power supply signal are sent to the high-power drive output and signal transmission circuit 6 through the remote control signal through the control chip U6 pin 6; on the other hand, when the control instruction is sent to the high-power drive output and signal transmission circuit 6, a feedback signal is synchronously sent to the remote control terminal through the control chip U6 pin 23.

[0038] like Figure 5 As shown, the negative voltage level conversion and signal mutual transmission circuit 5 includes a transistor Q7 and a transistor Q8. The emitter of the transistor Q7 is connected to the MCU control circuit 4. The base of the transistor Q7 is connected to one end of the resistor R37 and one end of the capacitor C27 respectively. The other end of the resistor R37 is connected to the other end of the capacitor C27, one end of the resistor R36, the negative end of the voltage stabilizing diode ZD3, one end of the resistor R25, one end of the resistor R24, one end of the resistor R39, and one end of the capacitor C28 respectively. The collector of the transistor Q7 is connected to the MCU control circuit 4. The electrodes of the transistor Q8 are respectively connected to the other end of the resistor R36 and the WIFI module control circuit 3, the other end of the resistor R24 is grounded, the positive end of the voltage regulator diode ZD3 and the other end of the resistor R25 are respectively connected to the -5V voltage, the emitter of the transistor Q8 is connected to the WIFI module control circuit 3, the base of the transistor Q8 is respectively connected to the other end of the resistor R39 and the other end of the capacitor C28, the collector of the transistor Q8 is respectively connected to one end of the resistor R38 and the MCU control circuit 4, and the other end of the resistor R38 is grounded. When the Wi-Fi module control circuit 3 receives a remote control signal, it transmits the remote control signal to the MCU control circuit 4 via the conductive transistor Q8. When the MCU control circuit 4 sends a feedback signal, the feedback signal is transmitted to the Wi-Fi module control circuit 3 via the conductive transistor Q7. In the negative voltage level conversion and signal transmission circuit 5, a voltage divider outputs -1.7V via resistor R25, creating a 3.3V voltage difference with the -5V voltage, turning on transistors Q7 and Q8, thereby enabling the potential points of each other to be converted during information exchange. For example, the feedback signal from the MCU control circuit 4 is converted to the voltage level required by the Wi-Fi module control circuit 3 through the level conversion of transistor Q7. Similarly, the remote control signal from the Wi-Fi module control circuit 3 is converted to the voltage level required by the MCU control circuit 4 through the level conversion of transistor Q8.

[0039] like Figure 7As shown, the high-power drive output and signal transmission circuit 6 includes a transistor Q2, the base of which is connected to one end of a resistor R20 and one end of a resistor R19, respectively. The other end of the resistor R19 is connected to the MCU control circuit 4. The emitter of the transistor Q2 and the other end of the resistor R20 are respectively connected to a -5V voltage. The collector of the transistor Q2 is respectively connected to one end of a resistor R12 and a control end of a thyristor TRIAC1 through a resistor R32. The other end of the resistor R12 is respectively connected to the cathode end of the thyristor TRIAC1 and the J1 end of the low-voltage AC power supply through F1. The anode end of the thyristor TRIAC1 is respectively connected to one end of a resistor R26, one end of a capacitor C22, and an output terminal J4. The other end of the resistor R26 is respectively connected to the other end of the capacitor C22, the J2 end of the low-voltage AC power supply, and the output terminal J3. The output terminals J3 and J4 are respectively connected to the load. When the MCU control circuit 4 outputs a control instruction, the transistor Q2 is turned on, the thyristor TRIAC1 is turned on, and the AC power is temporarily cut off, and the power supply and related control instructions are output to the LED load or other low-voltage controller through the output terminals J3 and J4.

[0040] like Figure 8 As shown, AC power input indication circuit 7 includes indicator LED 1. The cathode of indicator LED 1 is connected to terminal J2 of the low-voltage AC power supply. The anode of indicator LED 1 is connected to the cathode of diode D3 via resistors R4 and R3, respectively. The anode of diode D3 is connected to terminal J1 of the low-voltage AC power supply via F1. When power is input to the low-voltage AC power supply, power is supplied to both ends of AC power input indication circuit 7, causing indicator LED 1 to operate and illuminate.

[0041] like Figure 9 As shown, the control center operation indication circuit 8 includes an indicator LED 3. The positive terminal of the indicator LED 3 is connected to the MCU control circuit 4 via a resistor R31, and the negative terminal of the indicator LED 3 is connected to -5V. When the MCU control circuit 4 is operating, the MCU control circuit 4 controls the indicator LED 3 to illuminate, and controls the indicator LED 3 to flash when transmitting or receiving signals.

[0042] like Figure 7 As shown, load input indication circuit 9 includes indicator LED 2. The cathode of indicator LED 2 is connected to terminal J4 of high-power drive output and signal transmission circuit 6. The anode of indicator LED 2 is connected to the cathode of diode D11 via resistor R11. The anode of diode D11 is connected to terminal J2 of the low-voltage AC power supply. When the power tube is turned on and load power is output, indicator LED 2 lights up, indicating that the output circuit is operating normally.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made based on the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A two-wire signal transmission control circuit using negative voltage power supply, characterized in that: The invention comprises an AC half-wave rectifier negative voltage output circuit (1) connected to a low-voltage AC power supply for outputting a negative voltage after AC half-wave rectification, a detection circuit (2) connected to the low-voltage AC power supply for detecting a power supply signal, and a WIFI module control circuit (3) for transmitting a signal to a remote control terminal. The detection circuit (2) is connected to an MCU control circuit (4). A negative voltage level conversion and signal mutual transmission circuit (5) is connected between the MCU control circuit (4) and the WIFI module control circuit (3) for enabling the MCU control circuit (4) to receive a remote control signal and enabling the WIFI module control circuit (3) to receive a feedback signal. The MCU control circuit (4) is connected to a high-power drive output and signal transmission circuit (6) for sending a control instruction for converting a remote control signal and a synchronously received detection power supply signal to a load. The AC half-wave rectifier negative voltage output circuit (1) transmits a signal to the MCU control circuit (4), the power supply signal detection circuit (2), the WIFI module control circuit (3), and the negative voltage level conversion and signal mutual transmission circuit (5). The transmission circuit (5) is powered by the negative voltage level conversion and signal mutual transmission circuit (5), which includes a transistor Q7 and a transistor Q8. The emitter of the transistor Q7 is connected to the MCU control circuit (4), the base of the transistor Q7 is connected to one end of the resistor R37 and one end of the capacitor C27 respectively, and the other end of the resistor R37 is connected to the other end of the capacitor C27, one end of the resistor R36, the negative end of the voltage regulator diode ZD3, one end of the resistor R25, one end of the resistor R24, one end of the resistor R39, and one end of the capacitor C28 respectively. The transistor Q7 The collector is connected to the other end of the resistor R36 and the WIFI module control circuit (3), the other end of the resistor R24 is grounded, the positive end of the voltage stabilizing diode ZD3 and the other end of the resistor R24 are connected to a -5V voltage, the emitter of the transistor Q8 is connected to the WIFI module control circuit (3), the base of the transistor Q8 is connected to the other end of the resistor R39 and the other end of the capacitor C28, the collector of the transistor Q8 is connected to one end of the resistor R38 and the MCU control circuit (4), and the other end of the resistor R38 is grounded.

2. The control circuit for two-wire signal transmission using negative voltage power supply according to claim 1, characterized in that: The AC half-wave rectifier negative voltage output circuit (1) includes a rectifier chip U3, wherein pin 1 of the rectifier chip U3 is grounded, pin 2 of the rectifier chip U3 is respectively connected to one end of a capacitor C9, a negative end of an electrolytic capacitor C1, a negative end of an electrolytic capacitor C1-1, and a positive end of a diode D4 through a resistor R13, the negative end of the diode D4 is connected to a J2 end of a low-voltage AC power supply, the other end of the capacitor C9, the positive end of the electrolytic capacitor C1, and the positive end of the electrolytic capacitor C1-1 are respectively grounded, pin 3 of the rectifier chip U3 is respectively connected to the negative end of the electrolytic capacitor C2 and one end of a capacitor C12, the positive end of the electrolytic capacitor C2 and the other end of the capacitor C12 are grounded, and pin 3 of the rectifier chip U3 outputs a -5V voltage.

3. The control circuit for two-wire signal transmission using negative voltage power supply according to claim 1, characterized in that: The detection circuit (2) includes a photocoupler U4, wherein pin 1 of the photocoupler U4 is connected to one end of the capacitor C7 and one end of the resistor R44 respectively, the other end of the resistor R44 is connected to the negative end of the diode D1 through the resistor R5, the positive end of the diode D1 is connected to the J1 end of the low-voltage AC power supply through F1, pin 2 of the photocoupler U4 is connected to the other end of the capacitor C7 and one end of the resistor R9 respectively, the other end of the resistor R9 is connected to the J2 end of the low-voltage AC power supply, pin 3 of the photocoupler U4 is grounded, pin 4 of the photocoupler U4 is connected to one end of the resistor R7 and the base of the transistor Q1 respectively through the resistor R6, the other end of the resistor R7, the emitter of the transistor Q1, and one end of the capacitor C5 are connected to a -5V voltage respectively, the collector of the transistor Q1 is connected to one end of the resistor R2, the other end of the capacitor C5, and the MCU control circuit (4) respectively, and the other end of the resistor R2 is grounded.

4. The control circuit for two-wire signal transmission using negative voltage power supply according to claim 1, characterized in that: The WIFI module control circuit (3) includes a WIFI control chip U7, wherein the pin 1 of the WIFI control chip U7 is respectively connected to one end of a resistor R56 and one end of a capacitor C22, and the other end of the resistor R56 is grounded. The other end of the capacitor C22 is respectively connected to one end of a resistor R55 and the pin 3 of the WIFI control chip U7 through the capacitor C17, and the other end of the resistor R55 is grounded. The pin 8 of the WIFI control chip U7, one end of the capacitor C25, and one end of the capacitor C35 are respectively grounded. The other end of the capacitor C25 and the other end of the capacitor C35 are respectively connected to a -5V voltage. The pin 9 of the WIFI control chip U7 is connected to a -5V voltage. The pin 15 of the WIFI control chip U7 is connected to a negative voltage level conversion and signal mutual transmission circuit (5) through a resistor R52. The pin 16 of the WIFI control chip U7 is respectively connected to one end of a resistor R53 and one end of a resistor R51, the other end of the resistor R53 is connected to a -5V voltage, and the other end of the resistor R51 is connected to the negative voltage level conversion and signal mutual transmission circuit (5).

5. The control circuit for two-wire signal transmission using negative voltage power supply according to claim 1, characterized in that: The MCU control circuit (4) includes a control chip U6, wherein pin 1 of the control chip U6, one end of the capacitor C8, and one end of the capacitor C15 are respectively connected to a -5V voltage, pin 3 of the control chip U6 is respectively connected to the other end of the capacitor C8, the other end of the capacitor C15, and one end of the resistor R45, the other end of the resistor R45 and the positive end of the electrolytic capacitor C13 are respectively grounded, the negative end of the electrolytic capacitor C13 is connected to a -5V voltage, pin 4 of the control chip U6 is connected to a detection circuit (2), pin 6 of the control chip U6 is connected to a high-power drive output and signal transmission circuit (6), pin 21 of the control chip U6 is connected to a control center work indication circuit (8), pins 23-24 of the control chip U6 are connected to a negative voltage level conversion and signal mutual transmission circuit (5), pin 26 of the control chip U6 is respectively connected to one end of the resistor R61 and one end of the capacitor C61, the other end of the resistor R61 is grounded, the other end of the capacitor C61 is connected to a -5V voltage, and pin 26 of the control chip U6 is connected to a reset test point.

6. The control circuit for two-wire signal transmission using negative voltage power supply according to claim 1, characterized in that: The high-power drive output and signal transmission circuit (6) includes a transistor Q2, wherein the base of the transistor Q2 is connected to one end of a resistor R20 and one end of a resistor R19 respectively, and the other end of the resistor R19 is connected to the MCU control circuit (4). The emitter of the transistor Q2 and the other end of the resistor R20 are connected to a -5V voltage respectively. The collector of the transistor Q2 is connected to one end of a resistor R12 and a control end of a thyristor TRIAC1 respectively through a resistor R32. The other end of the resistor R12 is connected to the cathode end of the thyristor TRIAC1 and the J1 end of the low-voltage AC power supply through F1. The anode end of the thyristor TRIAC1 is connected to one end of a resistor R26, one end of a capacitor C22, and an output terminal J4 respectively. The other end of the resistor R26 is connected to the other end of the capacitor C22, the J2 end of the low-voltage AC power supply, and the output terminal J3 respectively. The output terminals J3 and J4 are connected to the load respectively.

7. The control circuit for two-wire signal transmission using negative voltage power supply according to claim 1, characterized in that: An AC power input indication circuit (7) for indicating AC power input is connected to both ends of the low-voltage AC power supply. The AC power input indication circuit (7) includes an indicator light LED1. The cathode end of the indicator light LED1 is connected to the J2 end of the low-voltage AC power supply. The anode end of the indicator light LED1 is connected to the cathode end of the diode D3 through resistors R4 and R3 in sequence. The anode end of the diode D3 is connected to the J1 end of the low-voltage AC power supply through F1.

8. The control circuit for two-wire signal transmission using negative voltage power supply according to claim 1, characterized in that: The MCU control circuit (4) is connected to a control center operation indication circuit (8) for indicating the operation of the MCU control circuit (4). The control center operation indication circuit (8) includes an indicator light LED3. The positive terminal of the indicator light LED3 is connected to the MCU control circuit (4) through a resistor R31, and the negative terminal of the indicator light LED3 is connected to -5V.

9. The control circuit for two-wire signal transmission using negative voltage power supply according to claim 1, characterized in that: The high-power drive output and signal transmission circuit (6) is connected to a load input indication circuit (9) for indicating the operation of the high-power drive output and signal transmission circuit (6). The load input indication circuit (9) includes an indicator light LED2. The cathode end of the indicator light LED2 is connected to the J4 end of the high-power drive output and signal transmission circuit (6). The anode end of the indicator light LED2 is connected to the cathode end of the diode D11 through the resistor R11. The anode of the diode D11 is connected to the J2 end of the low-voltage AC power supply.

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