Capacitance feedback type direct current carrier wave LED ground foot lamp and stair lamp control system and switching power supply special for control

Abstract

The utility model discloses a capacitance feedback type direct current carrier wave LED ground foot lamp and stair lamp control system and a special switch power supply for control, which comprises a switch power supply part circuit (W1), a main control part circuit (W2) and a bus load part circuit (W3), the switch power supply part circuit (W1) is connected to an alternating current power supply main line, and the main control part circuit (W2) is connected to a bus load part circuit (W3). The main control part circuit (W2) is connected to the switching power supply part circuit (W1), and the bus load part circuit (W3) is connected to the main control part circuit (W2). The utility model relates to the field of switching power supply, direct current carrier wave, control system and LED application, in particular to a capacitance feedback type direct current carrier wave LED foot lamp and stair lamp control system and a special switching power supply for control.

Description

Technical Field

[0001] The utility model relates to the technical fields of switching power supplies, DC carriers, control systems and LED lamp applications, and in particular to a capacitor feedback DC carrier LED footlight and stair light control system and a dedicated switching power supply for control. Background Art

[0002] With the improvement of living standards, people pay more and more attention to the sense of ritual in life. LED footlights and stair lights are commonly used products to enhance the sense of ritual. The design principle of their products is: after the controller system detects the arrival of a person through the sensor, it controls each LED light bar to light up in sequence or all LED light bars to light up together. When it detects that a person has left, it controls each LED light bar to turn off in sequence or all LED light bars to turn off together, so as to achieve the effect of lighting up when a person comes and turning off when a person leaves, thus achieving the energy-saving effect of lighting up when a person comes and turning off when a person leaves. Among them, the control system of lighting up and turning off all LED light bars together is relatively simple and is not within the scope of this patent. This patent only discusses the implementation of the control system of lighting up and turning off each LED light bar in sequence.

[0003] There are currently three implementation solutions on the market: Solution 1, multi-channel output controller + LED light bar + ordinary sensor, this is the earliest to appear, but the disadvantages are obvious, each LED light bar is individually wired to the controller, the more LED light strips, the more wires need to be connected, the higher the probability of wrong wiring on the construction site, and the wire cost is high, and the labor cost is also high; Solution 2, return-to-zero code 3-wire bus controller (power line, signal line, GND line) + return-to-zero code decoding small module + LED light bar + ordinary sensor, this method of wiring is relatively simple, but the characteristic of the return-to-zero code itself is serial connection, in this solution all the signal lines of the return-to-zero code decoding small module are hand-pulled If they are connected in series manually, if any of the return-to-zero code decoding chips in the middle is damaged or the signal line fails, all the light strips thereafter will be out of control, and the unidirectional transmission characteristics of the single-line return-to-zero code will cause the main controller to be unable to read the working status of a single return-to-zero code small module and unable to obtain the current step working status. In addition, the sensors required by the return-to-zero code 3-wire bus control system must also be connected to the sensor interface of the controller separately. The reduction in wire cost and labor cost is limited, and the reliability is even lower. There are many on-site customer complaints; Option 3, using a carrier 2-wire bus controller with a dedicated carrier transceiver chip + carrier decoding return small module + LED light strip + carrier sensor connection method, this carrier The 2-wire bus controller outputs 2 carrier buses. The carrier decoding module and the carrier sensor are both connected to these two main lines. The integrated power signal is equivalent to the signal lines being fully connected in parallel, which has high reliability. The controller can monitor the working status of the sensor and the carrier decoding module at any time, and any damage to the carrier decoding and return module will not affect the work of other modules. This method is characterized by low wire cost and low labor cost for construction. It is the current development direction of the control system for LED footlights and stair lights. However, the original intention of the design of this dedicated carrier chip is to do communication data transmission. It cannot directly drive the MOS tube to control the LED light bar to turn on and off, and still requires an MCU single chip. The machine is used to decode data and drive the MOS tube to control the LED light strip. Moreover, there is no unified industry standard for this carrier-specific chip. Different chip manufacturers, for their own interests, all make their own communication protocols and build their own peripheral circuits. If the chip is out of stock, even if chips from other manufacturers are obtained, they cannot be replaced immediately. Therefore, once this carrier-specific chip is selected, it is not conducive to risk control. As far as it can be seen, this carrier-specific chip is mostly expensive, and its peripheral circuit is relatively complex. The small carrier modules made are relatively large and the cost is high. Therefore, how to effectively control risks and reduce costs is a problem that must be solved when bringing the carrier controller to the market. Utility Model Content

[0004] In order to effectively control risks and reduce costs and reduce the volume of small carrier modules, the utility model provides a capacitor feedback DC carrier LED footlight and stair light control system and a dedicated switching power supply for control.

[0005] The technical solution adopted by the utility model is as follows: the utility model is a capacitor feedback DC carrier LED footlight and stair light control system and a dedicated switch power supply for control, comprising a switch power supply circuit (W1), a main control circuit (W2) and a bus load circuit (W3), wherein the switch power supply circuit (W1) is connected to the AC power main line, the main control circuit (W2) is connected to the switch power supply circuit (W1), and the bus load circuit (W3) is connected to the main control circuit (W2); the main control circuit (W2) comprises an input positive electrode Vinput, a power supply negative electrode GND, The invention relates to a voltage detection and DC-DC circuit (W201), a host MCU control unit (W202), a signal splitting and enhancing element (W203), a PMOS carrier generating circuit (W204), a carrier signal shaping and feedback detecting circuit (W205), an overload detecting circuit (W206), a human-machine interface circuit (W207), a carrier bus VBUS+ and a carrier bus VBUS-; the bus load circuit (W3) comprises a carrier bus VBUS+, a carrier bus VBUS-, a carrier sensor circuit (W301), a carrier small module circuit (W302), and light bar interfaces LED+ and LED-.

[0006] Furthermore, the host MCU control unit (W202) is sequentially connected to the voltage detection and DC-DC circuit (W201), the signal shunt and enhancement element (W203), the carrier signal shaping and feedback detection circuit (W205), the overload detection circuit (W206) and the human-machine interface circuit (W207), the signal shunt and enhancement element (W203) is sequentially connected to the PMOS carrier generation circuit (W204) and the carrier signal shaping and feedback detection circuit (W205), the PMOS carrier generation circuit (W204) and the carrier signal shaping and feedback detection circuit (W205) are jointly connected The overload detection circuit (W206) is connected to the carrier bus VBUS+, the voltage detection and DC-DC circuit (W201) and the PMOS carrier generation circuit (W204) are connected to the positive input Vinput, the voltage detection and DC-DC circuit (W201), the host MCU control unit (W202), the signal splitter and enhancement element (W203), the PMOS carrier generation circuit (W204), the carrier signal shaping and feedback detection circuit (W205) and the overload detection circuit (W206) are connected to the negative power supply GND. The carrier sensor circuit (W301) and the carrier small module circuit (W302) are connected to the carrier bus VBUS+ and the carrier bus VBUS- in sequence.

[0007] Furthermore, the voltage detection and DC-DC circuit (W201) includes an input positive electrode Vinput, a power supply VCC, a power supply negative electrode GND, a comparator output Cmp, a voltage comparator U21, a resistor R21, a resistor R22, a resistor R23, a resistor R24 and a DCDC circuit (W20101), wherein the first end of the resistor R21 and the Vin end of the DCDC circuit (W20101) are commonly connected to the input positive electrode Vinput, the first end of the resistor R23, the V+ end of the comparator U21 and the DCDC circuit (W The Vo terminal of the DCDC circuit (W20101) is commonly connected to the power supply VCC, the second end of the resistor R21, the first end of the resistor R22 and the Vin- terminal of the comparator U21 are commonly connected to Vcmp1, the second end of the resistor R23, the first end of the resistor R24 and the Vin+ terminal of the comparator U21 are commonly connected to Vref1, the V- terminal of the comparator, the second end of the resistor R22, the Vss terminal of the DCDC circuit (W20101) and the second end of the resistor R24 are commonly connected to the negative electrode GND of the power supply.

[0008] Furthermore, the signal branching and enhancement element (W203) includes a carrier control signal Bout, a control signal Pctl, a control signal Nctl, signal enhancement modules U31, U32 and U33, the A2 end of the signal enhancement module U32 and the A3 end of the signal enhancement module U33 are commonly connected to the Y1 end of the signal enhancement module U31, the carrier control signal Bout is connected to the A1 end of the signal enhancement module U31, the Y2 end of the signal enhancement module U32 is connected to the control signal Nctl, and the Y3 end of the signal enhancement module U33 is connected to the control signal Pctl.

[0009] Furthermore, the PMOS carrier generating circuit (W204) includes an input positive electrode Vinput, a power supply VCC, a power supply negative electrode GND, a control signal Pctl, a carrier bus VBUS+, a carrier bus VBUS-, resistors R41, R42, R43, R44, R45, R46, transistors Q41, Q42, Q43, a PMOS tube P41, a bidirectional TVS diode D41 and a diode D42, a first end of the resistor R41 being connected to the control signal Pctl, a second end of the resistor R41, a first end of the resistor R42 being connected to the b-pole of the transistor Q41, a c-pole of the transistor Q41 being connected to a first end of the resistor R43, a second end of the resistor R43, a first end of the resistor R44, a b-pole of the transistor Q42 being connected to a b-pole of the transistor Q43, and a c-pole of the transistor Q42 being connected. The transistor Q42 and the transistor Q43 are connected to the power supply VCC, the e-pole of the transistor Q42 and the e-pole of the transistor Q43 are connected to the first end of the resistor R45, the second end of the resistor R45 is connected to the G-pole of the PMOS transistor P41, the second end of the resistor R44, the c-pole of the transistor Q43, and the S-pole of the PMOS transistor P41 are commonly connected to the positive input Vinput, the D-pole of the PMOS transistor P41 and the first end of the bidirectional TVS diode D41 are commonly connected to the carrier bus VBUS+, the second end of the bidirectional TVS diode, the first end of the resistor R46 and the first end of the diode D42 are commonly connected to the carrier bus VBUS-, and the second end of the resistor R42, the e-pole of the transistor Q41, the second end of the resistor R46, and the second end of the diode D42 are commonly connected to the negative power supply GND.

[0010] Furthermore, the carrier signal shaping and feedback detection circuit (W205) includes a carrier bus VBUS+, a power supply VCC, a power supply negative electrode GND, a control signal Nctl, a feedback signal FB, resistors R51, R52, R53, R54, R55, R56, R57, R58, a capacitor C51, a transistor Q51, an NMOS transistor N51 and an optoelectronic isolator U51, a first end of the resistor R51 is connected to the control signal Nctl, a second end of the resistor R51, a first end of the resistor R52 is connected to the b-pole of the transistor Q51, a c-pole of the transistor Q51, a first end of the resistor R53, a first end of the resistor R54 is connected to the G-pole of the NMOS transistor N51, a D-pole of the NMOS transistor N51, a first end of the resistor R55 and the optoelectronic isolator. Port 2 of U51 is connected, port 1 of the optoelectronic isolator U51 is connected to the first end of the resistor R57, the second end of the resistor R57 is connected to the first end of the resistor R56, port 4 of the optoelectronic isolator U51, the first end of the resistor R58 and the first end of the capacitor C51 are commonly connected to the feedback signal FB, the second end of the resistor R55 and the second end of the resistor R56 are commonly connected to the carrier bus VBUS+, the second end of the resistor R53 and the second end of the resistor R58 are commonly connected to the power supply VCC, the second end of the resistor R52, the e end of the transistor Q51, the second end of the resistor R54, the S pole of the NMOS tube N51, port 3 of the optoelectronic isolator U51 and the second end of the capacitor C51 are commonly connected to the negative pole of the power supply GND.

[0011] Furthermore, the overload detection circuit (W206) includes a power supply VCC, a power supply negative electrode GND, a carrier bus VBUS-, resistors R61, R62, R63, a voltage comparator U61 and a comparator output signal Pint, the first end of the resistor R61, the first end of the resistor R62 and the Vin+ end of the voltage comparator U61 are connected, the Vin- end of the voltage comparator U61 is connected to the first end of the resistor R63, the second end of the resistor R63 is connected to the carrier bus VBUS-, the Vo end of the voltage comparator U61 is connected to the comparator output signal Pint, the V+ end of the voltage comparator U61 and the second end of the resistor R61 are commonly connected to the power supply VCC, and the V- end of the voltage comparator U61 and the second end of the resistor R62 are commonly connected to the power supply negative electrode GND.

[0012] Furthermore, the carrier sensor circuit (W301) includes a carrier bus VBUS+, a carrier bus VBUS-, a decoding circuit (W30101), an LDO power supply circuit (W30102), a sensing MCU control unit (W30103), a capacitor feedback circuit (W30104) and a sensor (W30105), wherein the sensing MCU control unit (W30103) is connected to the decoding circuit (W30101), the LDO power supply circuit (W30102), the capacitor feedback circuit (W30104) and the sensor (W30105). 105), the decoding circuit 1 (W30101), the LDO power supply circuit 1 (W30102) and the capacitor feedback circuit 1 (W30104) are commonly connected to the carrier bus VBUS+, the decoding circuit 1 (W30101), the LDO power supply circuit 1 (W30102), the sensing MCU control unit (W30103) and the capacitor feedback circuit 1 (W30104) are commonly connected to the carrier bus VBUS-, and the sensor (W30105) is connected to the sensing MCU control unit (W30103).

[0013] Furthermore, the decoding circuit 1 (W30101) includes a carrier bus VBUS+, a carrier bus VBUS-, a power supply VDD port, a signal Sin1 port, resistors R81, R82, R83 and a transistor Q81, the first end of the resistor R81 is connected to the carrier bus VBUS+, the second end of the resistor R81, the first end of the resistor R82 is connected to the b port of the transistor Q81, the c port of the transistor and the first end of the resistor R83 are commonly connected to the signal Sin1 port, the second end of the resistor R83 is connected to the power supply VDD port, and the second end of the resistor R82 and the e port of the transistor Q81 are commonly connected to the carrier bus VBUS-.

[0014] Furthermore, the LDO power supply circuit 1 (W30102) includes a carrier bus VBUS+, a carrier bus VBUS-, a power supply VDD port, resistors R91, R92, capacitors C91, C92, C93, C94, C95, C96, a bidirectional TVS diode D91, a diode D92 and an LDO chip U91, a first end of the resistor R91, a first end of the bidirectional TVS diode and a first end of the resistor R92 are commonly connected to the carrier bus VBUS+, and a second end of the resistor R92 is connected to the positive electrode of the diode D92. The cathode of the diode D92, the first ends of the capacitors C91, C92, and C93 are connected to the Vin port of the LDO chip U91, the Vo end of the LDO chip U91, the first ends of the capacitors C94, C95, and C96 are commonly connected to the power supply VDD port, the second end of the resistor R91, the second end of the bidirectional TVS diode, the second ends of the capacitors C91, C92, C93, C94, C95, and C96 and the Vss port of the LDO chip U91 are commonly connected to the carrier bus VBUS-.

[0015] Furthermore, the capacitor feedback circuit 1 (W30104) includes a Cout1 port, a carrier bus VBUS+, a carrier bus VBUS-, resistors R101 and R102, capacitors C101 and C102, and an NMOS transistor 2 N101. The first end of the resistor R101 is connected to the Cout1 port, the second end of the resistor R101, the first end of the resistor R102, the first end of the capacitor C101, and the G port of the NMOS transistor 2 N101 are connected. The D port of the NMOS transistor 2 N101 is connected to the first end of the capacitor C102, the second end of the capacitor C102 is connected to the carrier bus VBUS+, the second end of the resistor R102, the second end of the capacitor C101, and the S end of the NMOS transistor 2 N101 are commonly connected to the carrier bus VBUS-.

[0016] Furthermore, the carrier small module circuit (W302) includes a carrier bus VBUS+, a carrier bus VBUS-, a light bar interface LED+, a light bar interface LED-, diodes D111, D112, a resistor R111, a decoding circuit 2 (W30201), a capacitor feedback circuit 2 (W30202), a small module MCU control unit (W30203), an LDO power supply circuit 2 (W30204) and an LED light bar drive circuit (W30205), the positive electrode of the diode D111 is connected to the first end of the resistor R111, the negative electrode of the diode D111, the decoding circuit 2 (W30201), the capacitor feedback circuit 2 (W30202) and the positive electrode of the diode D112 are commonly connected to the carrier bus VBUS+, the negative electrode of the diode D112 and the LD The second LDO power supply circuit (W30204) is commonly connected to the light bar interface LED+, the small module MCU control unit (W30203) is respectively connected to the second decoding circuit (W30201), the second capacitor feedback circuit (W30202), the second LDO power supply circuit (W30204) and the LED light bar drive circuit (W30205), the LED light bar drive circuit (W30205) is connected to the light bar interface LED-, the second end of the resistor R111, the second decoding circuit (W30201), the second capacitor feedback circuit (W30202), the small module MCU control unit (W30203), the second LDO power supply circuit (W30204) and the LED light bar drive circuit (W30205) are commonly connected to the carrier bus VBUS-.

[0017] Furthermore, the decoding circuit 2 (W30201) includes a carrier bus VBUS+, a carrier bus VBUS-, a voltage VPP port, a signal Sin2 port, resistors R121, R122, R123 and a transistor Q121, the first end of the resistor R121 is connected to the carrier bus VBUS+, the second end of the resistor R121 and the first end of the resistor R122 are commonly connected to the b port of the transistor Q121, the c port of the transistor Q121 and the first end of the resistor R123 are commonly connected to the signal Sin2 port, the second end of the resistor R123 is connected to the voltage VPP port, and the second end of the resistor R122 and the e port of the transistor Q121 are commonly connected to the carrier bus VBUS-.

[0018] Furthermore, the second capacitor feedback circuit (W30202) includes a carrier bus VBUS+, a carrier bus VBUS-, a Cout2 port, resistors R131 and R132, capacitors C131 and C132, and an NMOS transistor N131. The first end of the resistor R131 is connected to the Cout2 port, the second end of the resistor R131, the first end of the resistor R132, and the first end of the capacitor C131 are commonly connected to the G port of the NMOS transistor N131, the D port of the NMOS transistor N131 is connected to the first end of the capacitor C132, the second end of the capacitor C132 is connected to the carrier bus VBUS+, the second end of the resistor R132, the second end of the capacitor C131, and the S port of the NMOS transistor N131 are commonly connected to the carrier bus VBUS-.

[0019] Furthermore, the LDO power supply circuit 2 (W30204) includes a light bar interface LED+, a carrier bus VBUS-, a voltage VPP port, a resistor R141, capacitors C141, C142, C143, C144 and an LDO chip U141. The first end of the resistor R141 and the first end of the capacitor C141 are commonly connected to the light bar interface LED+, the second end of the resistor R141 and the first end of the capacitor C142 are commonly connected to the Vin port of the LDO chip U141, the Vo port of the LDO chip U141, the first end of the capacitor C143 and the first end of the capacitor C144 are commonly connected to the voltage VPP port, the second end of the capacitor C141, the second end of the capacitor C142, the second end of the capacitor C143, the second end of the capacitor C144 and the Vss port of the LDO chip U141 are commonly connected to the carrier bus VBUS-.

[0020] Furthermore, the LED light strip drive circuit (W30205) includes a light strip interface LED-, a Lout1 port, a carrier bus VBUS-, resistors R151, R152 and a fourth NMOS tube N151, wherein the first end of the resistor R151 is connected to the Lout1 port, the second end of the resistor R151, the first end of the resistor R152 is connected to the G port of the fourth NMOS tube N151, the D port of the fourth NMOS tube N151 is connected to the light strip interface LED-, and the second end of the resistor R152 and the S end of the fourth NMOS tube N151 are commonly connected to the carrier bus VBUS-.

[0021] Furthermore, the carrier control signal Bout from the host MCU control unit (W202) is divided into Pctl and Nctl after passing through the signal splitter and enhancement element (W203), wherein Pctl is used to control the PMOS carrier generation circuit (W204) to generate the carrier signal VBUS+, and Nctl is used to control the carrier signal shaping and feedback detection circuit (W205) to shape the carrier signal. This carrier signal VBUS+ is transmitted to the carrier sensor circuit (W301) and the carrier small module circuit (W302) via a wire, so that the carrier sensor circuit (W301) and the carrier small module circuit (W302) can receive the signal sent by the host MCU control unit (W202), accept the control of the host MCU control unit (W202) to achieve a specific control effect, and when the carrier sensor circuit (W301) passes through the sensor ( After the signal is detected by the capacitor feedback circuit 1 (W30105), the sensing MCU control unit (W30103) controls the capacitor feedback circuit 1 (W30104) to transmit the sensing signal to the carrier bus VBUS+. After the signal is shaped by the carrier signal and the feedback detection circuit (W205), the host MCU control unit (W202) can view the signal through the FB port. Similarly, the carrier small module circuit (W302) can also transmit its response signal to the host MCU control unit (W202) through the capacitor feedback circuit 2 (W30202). At this time, the module circuits of the capacitor feedback DC carrier LED footlight and stair light control system can communicate with each other. Therefore, the capacitor feedback DC carrier LED footlight and stair light control system can be realized by building a peripheral circuit with an ordinary MCU, avoiding the supply risk of dedicated chips and reducing circuit costs.

[0022] The utility model realizes communication between module circuits of the control system of LED footlights and staircase lights by adopting capacitor feedback DC carrier technology, which not only improves the flexibility and reliability of the system but also significantly reduces the cost of the system.

[0023] Specifically, the beneficial effects of the present invention also include:

[0024] (1) Efficient communication: By transmitting the carrier signal VBUS+ on the wire, efficient communication is achieved between the host MCU control unit (W202), the carrier sensor circuit (W301), and the carrier module circuit (W302). This communication method is not only fast but also has a long transmission distance, effectively solving the problem of poor communication in traditional LED footlight and stair light control systems.

[0025] (2) Modular design: The system adopts a modular design. Each module is connected through the carrier bus VBUS+ and VBUS-, making the system structure clear and easy to maintain and expand. At the same time, the modular design also reduces the complexity and cost of the system.

[0026] (3) Intelligent control: Through the control of the host MCU control unit (W202), intelligent control of LED footlights and stair lights can be achieved. For example, parameters such as light brightness and on / off time can be automatically adjusted according to factors such as ambient light and human activity, improving the system's intelligence level and user experience.

[0027] (4) Energy saving and environmental protection: LED footlights and staircase lights have the advantages of energy saving and environmental protection. The utility model further improves their energy saving effect through intelligent control. For example, when no one is active, the light brightness can be automatically reduced or turned off to avoid unnecessary energy waste.

[0028] (5) Wide applicability: This utility model is not only suitable for LED footlights and stair light control systems, but can also be widely used in other occasions that require intelligent control. For example, it can be used in smart homes, smart offices and other fields, bringing more convenience to people's lives and work. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of a capacitor feedback DC carrier LED footlight and stair light control system and a dedicated switching power supply for control;

[0030] Figure 2 This is a schematic diagram of the structure of a capacitor feedback DC carrier LED footlight and stair light control system and a voltage detection and DC-DC circuit (W201) for a dedicated switching power supply;

[0031] Figure 3 This is a schematic diagram of the structure of a capacitor feedback DC carrier LED footlight and stair light control system and a signal branch and enhancement component (W203) for a dedicated switching power supply;

[0032] Figure 4 This is a schematic diagram of the structure of a capacitor feedback DC carrier LED footlight and stair light control system and a PMOS carrier generating circuit (W204) for controlling a dedicated switching power supply;

[0033] Figure 5 This is a schematic diagram of the structure of a capacitor feedback DC carrier LED footlight and stair light control system and a carrier signal shaping and feedback detection circuit (W205) for controlling a dedicated switching power supply;

[0034] Figure 6 This is a schematic diagram of the structure of a capacitor feedback DC carrier LED footlight and stair light control system and an overload detection circuit (W206) for controlling a dedicated switching power supply;

[0035] Figure 7 This is a schematic diagram of the structure of a capacitor feedback DC carrier LED footlight and stair light control system and a carrier sensor circuit (W301) for controlling a dedicated switching power supply;

[0036] Figure 8 This is a schematic diagram of the structure of a capacitor feedback DC carrier LED footlight and stair light control system and a decoding circuit (W30101) for controlling a dedicated switching power supply.

[0037] Figure 9 This is a schematic diagram of the structure of a capacitor feedback DC carrier LED footlight and stair light control system and an LDO power supply circuit (W30102) that controls a dedicated switching power supply.

[0038] Figure 10 This is a schematic diagram of the structure of a capacitor feedback DC carrier LED footlight and stair light control system and a capacitor feedback circuit (W30104) for controlling a dedicated switching power supply.

[0039] Figure 11 This is a schematic diagram of the structure of a capacitor feedback DC carrier LED footlight and stair light control system and a carrier small module circuit (W302) for controlling a dedicated switching power supply;

[0040] Figure 12 This is a schematic diagram of the structure of a capacitor feedback DC carrier LED footlight and stair light control system and a decoding circuit 2 (W30201) for controlling a dedicated switching power supply;

[0041] Figure 13 This is a schematic diagram of the structure of a capacitor feedback DC carrier LED footlight and stair light control system and a capacitor feedback circuit 2 (W30202) for controlling a dedicated switching power supply.

[0042] Figure 14 This is a schematic diagram of the structure of a capacitor feedback DC carrier LED footlight and stair light control system and an LDO power supply circuit 2 (W30204) for controlling a dedicated switching power supply.

[0043] Figure 15 The utility model is a structural diagram of a capacitor feedback DC carrier LED footlight and stair light control system and an LED light strip drive circuit (W30205) that controls a dedicated switching power supply. DETAILED DESCRIPTION

[0044] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, the following further describes this application in detail with reference to the accompanying drawings and implementation methods. It should be understood that the implementation methods described herein are only used to explain this application and are not intended to limit this application.

[0045] The utility model provides a capacitor feedback DC carrier LED footlight and stair light control system and a dedicated switching power supply for control. In the field of LED footlight and stair light control, the number of nodes that the main control needs to drive is small (the number of small modules is generally about 30, and the number of sensors is generally 2). Most of the time, the host sends brightness data in one direction, the sensor only transmits a trigger signal, and the small module only transmits a response signal during installation and debugging. In view of the above characteristics, the utility model designs a capacitor feedback DC carrier LED footlight and stair light control system and a dedicated switching power supply for control. The implementation principle is: with a single-chip microcomputer as the core, a carrier generation circuit is built in the main control part, and a decoding circuit is built in the sensor and small module part, so that the control signal of the host MCU control unit can be transmitted to the sensor and the small module; a capacitor feedback circuit is built in the sensor and the small module part, and a feedback detection circuit is built in the host part, so that the host MCU control unit can receive the feedback signal of the sensor and the small module, thereby using an ordinary single-chip microcomputer to realize the carrier two-way signal transmission that previously required the help of a dedicated carrier chip.

[0046] like Figures 1-15 As shown, the utility model is a capacitor feedback DC carrier LED footlight and stair light control system and a dedicated switching power supply for control, comprising a switching power supply circuit (W1), a main control circuit (W2) and a bus load circuit (W3). The switching power supply circuit (W1) is connected to the AC power main line, the main control circuit (W2) is connected to the switching power supply circuit (W1), and the bus load circuit (W3) is connected to the main control circuit (W2). The main control circuit (W2) internally includes a voltage detection and DC-DC circuit (W201), a host MCU control unit (W202), a signal branching and enhancement element (W203), a PMOS carrier generation circuit (W204), a carrier signal shaping and feedback detection circuit (W205), an overload detection circuit (W206) and a human-machine interface circuit (W207). The bus load circuit (W3) internally includes a carrier sensor circuit (W301) and a carrier small module circuit (W302).

[0047] Furthermore, the voltage detection and DC-DC circuit (W201) includes an input positive electrode Vinput, a power supply VCC, a power supply negative electrode GND, a comparator output Cmp, a voltage comparator U21, a resistor R21, a resistor R22, a resistor R23, a resistor R24 and a DCDC circuit (W20101). In the voltage divider circuit composed of the resistor R21 and the resistor R22 connected in series, the Vin- port voltage U of the voltage comparator U21 is Vcmp1 The voltage U of the positive input Vinput Vinput The following relationship is satisfied:

[0048] U Vcmp1 =U Vinput ×R22 / (R21+R22)

[0049] In the voltage divider circuit composed of resistors R23 and R24 in series, the voltage U of the Vin+ port of the voltage comparator U21 is Vref1 The voltage U of the power supply VCC VCC The following relationship is satisfied:

[0050] U Vref1 =U VCC ×R24 / (R23+R24)

[0051] Therefore, by detecting the voltage status of the Vo port, i.e., the Cmp port, of the voltage comparator U21, the host MCU control unit (W202) can immediately know the voltage fluctuation of the positive input Vinput. Combined with the status of the output port Pint of the overload detection circuit (W206), the host MCU control unit (W202) can quickly shut down the PMOS tube to protect the circuit when an abnormality occurs.

[0052] Furthermore, the signal splitting and enhancement element (W203) internally includes a carrier control signal Bout, a control signal Pctl, a control signal Nctl, and signal enhancement modules U31, U32, and U33. The signal Bout is divided into two after being enhanced by U31, and then enhanced again by U32 and U33 to become Pctl and Nctl. This two-stage enhancement relatively isolates the influence of the loads connected to Pctl and Nctl on each other, thereby obtaining two control signals with the same phase. Since there is isolation enhancement between the output and the input, the load size of any one of Pctl or Nctl will not affect the signal amplitude of the other one.

[0053] Furthermore, the PMOS carrier generating circuit (W204) internally includes an input positive electrode Vinput, a power supply VCC, a power supply negative electrode GND, a control signal Pctl, a carrier bus VBUS+, a carrier bus VBUS-, resistors R41, R42, R43, R44, R45, R46, transistors Q41, Q42, Q43, a PMOS tube P41, a bidirectional TVS diode D41 and a diode D42. After the signal Pctl passes through the signal amplitude amplification circuit composed of the transistor Q41 as the core, its amplitude is increased, and then passes through The common-emitter amplifier circuit, composed of transistors Q42 and Q43, has enhanced current driving capability, enabling it to drive PMOS transistor P41. In this circuit, port C of transistor Q42 is connected to VCC to raise the voltage threshold to ensure that the voltage amplitude at port G of PMOS transistor P41 is within the specified component parameters. Bidirectional TVS diode D41 is used to clamp spikes generated during the switching process of PMOS transistor P41. Resistor R46 is a sampling resistor, and diode D42 is connected in parallel across the sampling resistor to prevent instantaneous high current from damaging sampling resistor R46.

[0054] Furthermore, the carrier signal shaping and feedback detection circuit (W205) includes a carrier bus VBUS+, a power supply VCC, a power supply negative electrode GND, a control signal Nctl, a feedback signal FB, resistors R51, R52, R53, R54, R55, R56, R57, R58, a capacitor C51, a transistor Q51, an NMOS tube N51 and an optoelectronic isolator U51, wherein R55 and R56 are fast recovery fuse resistors. In this circuit, the signal Nctl After being enhanced by the transistor Q51, the NMOS tube N51 is controlled to realize the shaping of the VBUS+ signal. Since Pctl and Nctl are control signals with the same phase, they control the PMOS tube P41 and the NMOS tube N51 respectively. Due to the difference in the working characteristics of the MOS tube itself, when the PMOS tube P41 is turned on, the NMOS tube N51 is turned off. When the PMOS tube P41 is turned off, the NMOS tube N51 is turned on. When the carrier bus VBUS+ is a resistive load Or when the load is an LED, there is no voltage difference between port 1 and port 2 of the optoelectronic isolator U51, the internal diode of the optoelectronic isolator U51 does not work, and the feedback signal FB is high. When the load on the carrier bus VBUS+ is a capacitive load, the conduction of N51 will cause R55 to trigger a fuse, and the signal shaping function of this circuit will fail. A voltage difference will be generated between port 1 and port 2 of the optoelectronic isolator U51, the internal diode of the optoelectronic isolator U51 will work, and the feedback signal FB is low. The host MCU control unit can detect the level change of the feedback signal FB to know that the load is capacitive. By detecting the number and interval of this capacitive feedback signal, information about the sensor and small module can be obtained. Among them, the transistor signal amplification circuit with Q51 as the core mainly plays the role of signal delay matching. By adjusting the circuit parameters, the turn-on time of the NMOS tube N51 ultimately controlled by the signal Nctl matches the turn-off time of the PMOS tube P41 ultimately controlled by the signal Pctl.

[0055] Furthermore, the overload detection circuit (W206) includes a power supply VCC, a power supply negative electrode GND, a carrier bus VBUS-, resistors R61, R62, R63, a voltage comparator U61 and a comparator output signal Pint. In the voltage divider circuit composed of resistors R61 and R62 in series, the Vin+ port voltage U of the voltage comparator U61 is Vref2 The voltage U of the power supply VCC VCC The following relationship is satisfied:

[0056] U Vref2 =U VCC ×R62 / (R61+R62)

[0057] Therefore, by detecting the voltage status of the Vo port, i.e., the Pint port, of the voltage comparator U61, the host MCU control unit (W202) can immediately know whether the input carrier bus VBUS- is overloaded. Combining the voltage detection and the status of the output port Cmp of the DC-DC circuit (W201), the host MCU control unit (W202) can quickly shut down the PMOS tube to protect the circuit when an abnormality occurs.

[0058] Furthermore, the carrier sensor circuit (W301) includes a carrier bus VBUS+, a carrier bus VBUS-, a decoding circuit (W30101), an LDO power supply circuit (W30102), an induction MCU control unit (W30103), a capacitor feedback circuit (W30104) and an inductor (W30105), the decoding circuit (W30101) includes a carrier bus VBUS+, a carrier bus VBUS-, a power supply VDD port, a signal Sin1 port, resistors R81, R82, R83 and a transistor Q81, the LDO power supply circuit (W301 02) includes carrier bus VBUS+, carrier bus VBUS-, power supply VDD port, resistors R91, R92, capacitors C91, C92, C93, C94, C95, C96, bidirectional TVS diode D91, diode D92 and LDO chip U91, the capacitor feedback circuit (W30104) includes Cout1 port, carrier bus VBUS+, carrier bus VBUS-, resistors R101, R102, capacitors C101, C102 and NMOS tube two N101, the signals from carrier bus VBUS+ and VBUS- pass through transistor Q81, the amplitude The voltage is limited to below the VDD voltage range and transmitted to the sensing MCU control unit (W30103) through Sin1. When the sensing MCU control unit (W30103) receives the SENS signal from the sensor (W30105), it controls the NMOS transistor N101 to conduct through the Cout1 port, thereby connecting the capacitor C102 to the carrier bus VBUS+. The capacitor C102 changes the load characteristics of the carrier bus VBUS+ to a capacitive load. At this time, the host MCU control unit (W302) can detect this change through the carrier signal shaping and feedback detection circuit (W205). The signal sent by the sensing MCU control unit (W30103) through Cout1 is received. In this circuit, resistor R91 and bidirectional TVS diode D91 load and clamp the carrier buses VBUS+ and VBUS-, absorbing voltage spikes on the buses. Unidirectional diode D92 ensures that power can only be transmitted in one direction. The resistor divider circuit composed of resistors R81 and R82 should ensure that the voltage at port b of transistor Q81 is within a safe range. The function of capacitor C101 is to filter out interference and ensure that when the Cout1 port is low, NMOS transistor N101 will not be misleadingly turned on due to interference.

[0059] Furthermore, the carrier small module circuit (W302) includes a carrier bus VBUS+, a carrier bus VBUS-, a light bar interface LED+, a light bar interface LED-, diodes D111, D112, a resistor R111, a decoding circuit 2 (W30201), a capacitor feedback circuit 2 (W30202), a small module MCU control unit (W30203), an LDO power supply circuit 2 (W30204) and an LED light bar drive circuit (W30205), the decoding circuit 2 (W30201) includes a carrier bus VBUS+, a carrier bus VBUS-, a voltage VPP port, a signal Sin2 port, resistors R121, R122, R123 and a transistor Q121, the ... a LED light bar drive circuit (W Feed circuit 2 (W30202) includes carrier bus VBUS+, carrier bus VBUS-, Cout2 port, resistors R131, R132, capacitors C131, C132 and NMOS tube three N131, the LDO power supply circuit 2 (W30204) includes light bar interface LED+, carrier bus VBUS-, voltage VPP port, resistor R141, capacitors C141, C142, C143, C144 and LDO chip U141, the LED light bar drive circuit (W30205) includes light bar interface LED-, Lout1 port, carrier bus VBUS-, resistors R151, R152 and NMOS tube four N151, from carrier bus VBUS+ and VB After the US- signal passes through the transistor Q121, its amplitude is limited to below the VPP voltage amplitude and is transmitted to the small module MCU control unit (W30203) through Sin2. When there is a feedback demand, the small module MCU control unit (W30203) controls the NMOS tube three N131 to turn on through the Cout2 port, thereby connecting the capacitor C132 to the carrier bus VBUS+. The capacitor C132 will change the load characteristics of the carrier bus VBUS+ to a capacitive load. At this time, the host MCU control unit (W302) can detect this change through the carrier signal shaping and feedback detection circuit (W205), thereby receiving the signal sent by the small module MCU control unit (W30203) through Cout2. When there's a need to turn on the lights, the small module MCU control unit (W30203) controls NMOS transistor N151 through the Lout1 port, turning on the LED strip connected to the LED- interface. In this circuit, resistor R111 and diode D111 absorb reverse voltage spikes on the carrier bus VBUS+. To prevent reverse connection from damaging diode D111, resistor R111 can be used as a fast recovery resistor. Unidirectional diode D112 ensures unidirectional power transmission. Capacitor C141 is typically an electrolytic capacitor to ensure no visible flickering of the LED strip during PWM dimming. The resistor divider circuit formed by resistors R121 and R122 ensures that the voltage at port b of transistor Q121 is within a safe range.The function of capacitor C131 is to filter out interference and ensure that when the Cout2 port is low, the NMOS tube 3 N131 will not be misleadingly turned on due to interference.

[0060] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A capacitor feedback DC carrier LED footlight and stair light control system and a dedicated switching power supply, characterized by: The invention comprises a switching power supply circuit (W1), a main control circuit (W2) and a bus load circuit (W3), wherein the switching power supply circuit (W1) is connected to the AC power main line, the main control circuit (W2) is connected to the switching power supply circuit (W1), and the bus load circuit (W3) is connected to the main control circuit (W2); the main control circuit (W2) comprises an input positive electrode Vinput, a power supply negative electrode GND, a voltage detection and DC-DC circuit (W201), and a host MCU control unit. (W202), signal splitting and enhancing element (W203), PMOS carrier generating circuit (W204), carrier signal shaping and feedback detecting circuit (W205), overload detecting circuit (W206) and human-machine interface circuit (W207), carrier bus VBUS+ and carrier bus VBUS-; the bus load part circuit (W3) includes carrier bus VBUS+, carrier bus VBUS-, carrier sensor circuit (W301), carrier small module circuit (W302) and light bar interfaces LED+ and LED-.

2. A capacitor feedback DC carrier LED footlight and stair light control system and dedicated switching power supply according to claim 1, characterized in that: The host MCU control unit (W202) is connected to the voltage detection and DC-DC circuit (W201), the signal shunt and enhancement element (W203), the carrier signal shaping and feedback detection circuit (W205), the overload detection circuit (W206) and the human-machine interface circuit (W207) in sequence. The signal shunt and enhancement element (W203) is connected to the PMOS carrier generation circuit (W204) and the carrier signal shaping and feedback detection circuit (W205) in sequence. The PMOS carrier generation circuit (W204) and the carrier signal shaping and feedback detection circuit (W205) are commonly connected to the carrier bus VBUS+. The overload detection circuit (W206) is connected to the The carrier bus VBUS- is connected, the voltage detection and DC-DC circuit (W201) and the PMOS carrier generation circuit (W204) are commonly connected to the input positive electrode Vinput, the voltage detection and DC-DC circuit (W201), the host MCU control unit (W202), the signal branching and enhancement element (W203), the PMOS carrier generation circuit (W204), the carrier signal shaping and feedback detection circuit (W205) and the overload detection circuit (W206) are commonly connected to the power supply negative electrode GND, and the carrier sensor circuit (W301) and the carrier small module circuit (W302) are sequentially connected to the carrier buses VBUS+ and VBUS-.

3. A capacitor feedback DC carrier LED footlight and stair light control system and dedicated switching power supply according to claim 1, characterized in that: The PMOS carrier generating circuit (W204) includes an input positive electrode Vinput, a power supply VCC, a power supply negative electrode GND, a control signal Pctl, a carrier bus VBUS+, a carrier bus VBUS-, resistors R41, R42, R43, R44, R45, R46, transistors Q41, Q42, Q43, a PMOS tube P41, a bidirectional TVS diode D41 and a diode D42, a first end of the resistor R41 connected to the control signal Pctl, a second end of the resistor R41, a first end of the resistor R42 connected to the b-pole of the transistor Q41, a c-pole of the transistor Q41 connected to a first end of the resistor R43, a second end of the resistor R43, a first end of the resistor R44, the b-pole of the transistor Q42 connected to the b-pole of the transistor Q43, and a c-pole of the transistor Q42 connected to the The power supply VCC is connected, the e-pole of the transistor Q42 and the e-pole of the transistor Q43 are connected to the first end of the resistor R45, the second end of the resistor R45 is connected to the G-pole of the PMOS transistor P41, the second end of the resistor R44, the c-pole of the transistor Q43, and the S-pole of the PMOS transistor P41 are commonly connected to the positive input Vinput, the D-pole of the PMOS transistor P41 and the first end of the bidirectional TVS diode D41 are commonly connected to the carrier bus VBUS+, the second end of the bidirectional TVS diode, the first end of the resistor R46 and the first end of the diode D42 are commonly connected to the carrier bus VBUS-, the second end of the resistor R42, the e-pole of the transistor Q41, the second end of the resistor R46, and the second end of the diode D42 are commonly connected to the negative power supply GND.

4. A capacitor feedback DC carrier LED footlight and stair light control system and dedicated switching power supply according to claim 1, characterized in that: The carrier signal shaping and feedback detection circuit (W205) includes a carrier bus VBUS+, a power supply VCC, a power supply negative electrode GND, a control signal Nctl, a feedback signal FB, resistors R51, R52, R53, R54, R55, R56, R57, R58, a capacitor C51, a transistor Q51, an NMOS transistor N51 and an optoelectronic isolator U51, a first end of the resistor R51 is connected to the control signal Nctl, a second end of the resistor R51, a first end of the resistor R52 is connected to the b-pole of the transistor Q51, a c-pole of the transistor Q51, a first end of the resistor R53, a first end of the resistor R54 is connected to the g-pole of the NMOS transistor N51, a d-pole of the NMOS transistor N51, a first end of the resistor R55 and the optoelectronic isolator U51 The 2nd port of the photoelectric isolator U51 is connected to the first end of the resistor R57, the second end of the resistor R57 is connected to the first end of the resistor R56, the 4th port of the photoelectric isolator U51, the first end of the resistor R58 and the first end of the capacitor C51 are commonly connected to the feedback signal FB, the second end of the resistor R55 and the second end of the resistor R56 are commonly connected to the carrier bus VBUS+, the second end of the resistor R53 and the second end of the resistor R58 are commonly connected to the power supply VCC, the second end of the resistor R52, the e end of the transistor Q51, the second end of the resistor R54, the S pole of the NMOS tube N51, the 3rd port of the photoelectric isolator U51 and the second end of the capacitor C51 are commonly connected to the negative electrode GND of the power supply.

5. A capacitor feedback DC carrier LED footlight and stair light control system and dedicated switching power supply according to claim 1, characterized in that: The carrier sensor circuit (W301) includes a carrier bus VBUS+, a carrier bus VBUS-, a decoding circuit (W30101), an LDO power supply circuit (W30102), a sensing MCU control unit (W30103), a capacitor feedback circuit (W30104) and a sensor (W30105). The sensing MCU control unit (W30103) is respectively connected to the decoding circuit (W30101), the LDO power supply circuit (W30102), the capacitor feedback circuit (W30104) and the sensor (W30105). 5), the decoding circuit 1 (W30101), the LDO power supply circuit 1 (W30102) and the capacitor feedback circuit 1 (W30104) are commonly connected to the carrier bus VBUS+, the decoding circuit 1 (W30101), the LDO power supply circuit 1 (W30102), the sensing MCU control unit (W30103) and the capacitor feedback circuit 1 (W30104) are commonly connected to the carrier bus VBUS-, and the sensor (W30105) is connected to the sensing MCU control unit (W30103).

6. A capacitor feedback DC carrier LED footlight and stair light control system and dedicated switching power supply according to claim 5, characterized in that: The capacitor feedback circuit 1 (W30104) includes a Cout1 port, a carrier bus VBUS+, a carrier bus VBUS-, resistors R101 and R102, capacitors C101 and C102, and an NMOS transistor N101. The first end of the resistor R101 is connected to the Cout1 port, the second end of the resistor R101, the first end of the resistor R102, the first end of the capacitor C101 and the G port of the NMOS transistor N101 are connected, the D port of the NMOS transistor N101 is connected to the first end of the capacitor C102, the second end of the capacitor C102 is connected to the carrier bus VBUS+, the second end of the resistor R102, the second end of the capacitor C101 and the S end of the NMOS transistor N101 are commonly connected to the carrier bus VBUS-.

7. A capacitor feedback DC carrier LED footlight and stair light control system and dedicated switching power supply according to claim 1, characterized in that: The carrier small module circuit (W302) includes a carrier bus VBUS+, a carrier bus VBUS-, a light bar interface LED+, a light bar interface LED-, diodes D111 and D112, a resistor R111, a decoding circuit 2 (W30201), a capacitor feedback circuit 2 (W30202), a small module MCU control unit (W30203), a LDO power supply circuit 2 (W30204) and an LED light bar drive circuit (W30205), wherein the positive electrode of the diode D111 is connected to the first end of the resistor R111, the negative electrode of the diode D111, the decoding circuit 2 (W30201), the capacitor feedback circuit 2 (W30202) and the positive electrode of the diode D112 are commonly connected to the carrier bus VBUS+, and the negative electrode of the diode D112 is connected to the LDO power supply circuit 2 (W30204). The second electrical circuit (W30204) is commonly connected to the light bar interface LED+, the small module MCU control unit (W30203) is respectively connected to the second decoding circuit (W30201), the second capacitor feedback circuit (W30202), the second LDO power supply circuit (W30204) and the LED light bar drive circuit (W30205), the LED light bar drive circuit (W30205) is connected to the light bar interface LED-, the second end of the resistor R111, the second decoding circuit (W30201), the second capacitor feedback circuit (W30202), the small module MCU control unit (W30203), the second LDO power supply circuit (W30204) and the LED light bar drive circuit (W30205) are commonly connected to the carrier bus VBUS-.

8. The capacitor feedback DC carrier LED footlight and stair light control system and dedicated switching power supply according to claim 1, characterized in that: The carrier control signal Bout from the host MCU control unit (W202) is divided into Pctl and Nctl after passing through the signal splitter and enhancement element (W203), wherein Pctl is used to control the PMOS carrier generation circuit (W204) to generate the carrier signal VBUS+, and Nctl is used to control the carrier signal shaping and feedback detection circuit (W205) to shape the carrier signal.

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