Intelligent dimming control device with protection function

Abstract

The invention discloses an intelligent dimming control device with a protection function, which is characterized in that the input end of a switching power supply buck circuit is electrically connected with a mains supply end, the output end of the switching power supply buck circuit is electrically connected with an LDO (Low Dropout Regulator) step-down circuit, and the LDO step-down circuit is electrically connected with a main controller; the master control is electrically connected with the dimming circuit, the switching circuit, the load current detection circuit, the load detection circuit and the AC voltage zero-cross detection circuit, the AC voltage zero-cross detection circuit is electrically connected with the mains supply end, the dimming circuit is electrically connected with the mains supply end, a first end of a relay of the switching circuit is electrically connected with the dimming circuit, and a second end of the relay is electrically connected with the load current detection circuit. The second end of the relay of the switching circuit is electrically connected with the first gear end and the second gear end. The load current detection circuit is electrically connected with the first end of the relay of the switching circuit. The problem that a circuit needs to be modified when a user adopts an intelligent switch is solved, the stability of load detection is improved, and the cost of the detection circuit is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of lighting control, and in particular to an intelligent dimming control device with a protection function. Background Art

[0002] Room lighting equipment is generally equipped with two switches in different locations, one at the bedside and the other at the door. The purpose of setting up an intelligent control switch is to facilitate users to control and monitor through mobile terminals. Existing intelligent control switches are mainly single-control type, but they are easy to fail to detect when carrying a load with a small power.

[0003] Some smart switches also use a 3-way (zero, live, and ground) combination control method, among which the 3-way dimmer uses a single-line control solution. The 3-way combination control circuit replaces the traditional non-intelligent 3-way combination switch circuit, which requires a large circuit adjustment in the circuit wiring, which will cause great trouble to home improvement users. The pre-buried pipelines may need to be dismantled and moved, or modified into open wires.

[0004] To solve the above problems, the application number is: 202311798441.6, an improved intelligent dimming control device, which realizes the current state judgment of the switch through the identification circuit. The existing identification circuit determines the switch state by identifying the current waveform in the switch circuit. The disadvantage is that it is easy to make a misjudgment when the circuit fluctuates or the load is small.

[0005] The application number is: 202411069076.X, an intelligent switch control device, which detects the state of the switching circuit through the driver IC, calculates the currently connected circuit, and then determines the corresponding circuit state. The disadvantages are: the control method is relatively complicated, and the cost is high due to the introduction of two paths of the driver IC to connect the lamp. Attention should be paid to the protection of the driver IC (anti-surge), and in most cases, the driver IC should be equipped with an absorber, which further increases its cost.

[0006] Therefore, there is an urgent need for an intelligent dimming control device with a protection function that can solve one or more of the above problems. Summary of the invention

[0007] In order to solve one or more problems existing in the prior art, the present invention provides an intelligent dimming control device with a protection function. The technical solution adopted by the present invention to solve the above problems is: an intelligent dimming control device with a protection function, which comprises: a switching power supply buck circuit, the input end of the switching power supply buck circuit is electrically connected to the mains end, the output end of the switching power supply buck circuit is electrically connected to the LDO buck circuit, the LDO buck circuit is electrically connected to the main control, and the switching power supply buck circuit and the LDO buck circuit are low-voltage power supplies of different voltages respectively;

[0008] The main control is electrically connected to the dimming circuit, the switching circuit, the load current detection circuit, the load detection circuit, and the AC voltage zero-crossing detection circuit respectively; the AC voltage zero-crossing detection circuit is electrically connected to the mains end; the dimming circuit is electrically connected to the mains end; the first end of the relay of the switching circuit is electrically connected to the dimming circuit; the second end of the relay of the switching circuit is electrically connected to the first gear end and the second gear end respectively; and the load current detection circuit is electrically connected to the first end of the relay of the switching circuit;

[0009] The load detection circuit includes: a first optocoupler, an anode and a cathode of the first optocoupler are connected in parallel with a first capacitor, the anode and the cathode of the first optocoupler are electrically connected to the first gear end and the second gear end respectively, the anode or cathode of the first optocoupler is connected in series with a first detection resistor and a second detection resistor, the control end of the first optocoupler is electrically connected to the first end of the second capacitor, the low-voltage power supply end, and the collector of the transistor, the emitter of the first optocoupler is electrically connected to the first end of the first resistor and the base of the transistor, the emitter of the transistor is electrically connected to the first end of the second resistor and the first end of the third resistor, the second end of the third resistor is electrically connected to the main control, and the second end of the second capacitor, the second end of the first resistor, and the second end of the second resistor are electrically connected together and grounded.

[0010] In some embodiments, the load current detection circuit includes: a current transformer, a first winding of the current transformer is connected in series to a first end of the relay of the switching circuit, a first diode, a second diode, and a fourth resistor are connected in parallel at both ends of the second winding of the current transformer, a fifth resistor and a sixth resistor are connected in series at both ends of the second winding, respectively, the first diode and the second diode are configured in reverse, the fifth resistor and the sixth resistor are electrically connected to the positive input and negative input of the operational amplifier, respectively, the anode end of the first diode is grounded, the negative input is electrically connected to the first end of the seventh resistor, the second end of the seventh resistor is electrically connected to the low-voltage power supply end and the first end of the first filter capacitor, the second end of the first filter capacitor is grounded, the output end of the operational amplifier is electrically connected to the first end of the eighth resistor, the second end of the eighth resistor is electrically connected to the first end of the voltage-stabilizing diode and the main control, and the second end of the voltage-stabilizing diode is grounded.

[0011] In some embodiments, when the load detection circuit detects that neither the first gear end nor the second gear end is connected to a load, the master control controls the dimming circuit to stop outputting a dimming signal;

[0012] When the load detection circuit detects that the first gear end or the second gear end is connected to a load, the main control controls the dimming circuit to output a dimming signal.

[0013] In some embodiments, the present invention further comprises: a wireless communication module, wherein the wireless communication module is electrically connected to the main control and the LDO step-down circuit. Furthermore, the wireless communication module is any one or more of a Wi-Fi module, a Bluetooth module, a Zigbee module, a 4G module, a 5G module and a LoRa module.

[0014] In some embodiments, it also includes: an LED status indication circuit, wherein the LED status indication circuit is electrically connected to the main control and the LDO step-down circuit.

[0015] In some embodiments, it also includes: a function button circuit, which is electrically connected to the main control and the LDO buck circuit.

[0016] The technical effect achieved by the present invention is: the dual-speed design provided by the above-mentioned device is connected one-to-one with the traditional non-intelligent conversion switch, which solves the problem that users need to modify the circuit when using the intelligent switch. At the same time, it can also provide dimming function and protection function for the lamp. Among them, through the above-mentioned load current detection circuit and load detection circuit detection, the dimming circuit can also realize the rapid response function to the load end (rapid on and off control of the dimming signal), thereby protecting the device itself; in addition, the load detection circuit has lower cost and stronger stability for the load detection of the two gear ends, which reduces the influence of fluctuations on the detection at the device end and the load end, and cooperates with the load current detection circuit to further realize the detection of small loads and achieve the purpose of overcurrent protection. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 2 It is a schematic diagram of the switching circuit, dimming circuit and load detection circuit of the present invention;

[0019] Figure 3 is a schematic diagram of a load current detection circuit of the present invention;

[0020] Figure 4 This is a schematic diagram of the main control of the present invention;

[0021] Figure 5 It is a schematic diagram of the switching power supply buck circuit of the present invention;

[0022] Figure 6 It is a schematic diagram of the LDO step-down circuit of the present invention;

[0023] Figure 7 is a schematic diagram of an AC voltage zero-crossing detection circuit of the present invention;

[0024] Figure 8 is a schematic diagram of a wireless communication module of the present invention;

[0025] Fig. 9 It is a schematic diagram of the LED status indication circuit of the present invention;

[0026] Fig.10 It is a principle diagram of the function key circuit of the present invention.

[0027] [Reference Signs]

[0028] Figure 2 In: 1. Dimming circuit 2. Switching circuit 3. Load detection circuit. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more understandable, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from this description, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0030] like Figure 1 As shown, the present invention discloses an intelligent dimming control device with protection function, which includes: a switching power supply buck circuit, combined with Figure 5 As shown, the input end of the switching power supply buck circuit is electrically connected to the mains end, the output end of the switching power supply buck circuit is electrically connected to the LDO step-down circuit, the LDO step-down circuit is electrically connected to the main control, and the switching power supply buck circuit and the LDO step-down circuit are low-voltage power supplies with different voltages respectively;

[0031] The main control is electrically connected to the dimming circuit, the switching circuit, the load current detection circuit, the load detection circuit, and the AC voltage zero-crossing detection circuit respectively. The AC voltage zero-crossing detection circuit is electrically connected to the mains terminal, and the dimming circuit is electrically connected to the mains terminal. Figure 2 As shown, the first end of the relay K1 of the switching circuit 2 is electrically connected to the dimming circuit, the second end of the relay K1 of the switching circuit 2 is electrically connected to the first gear end T1 and the second gear end T2 respectively, the load current detection circuit is electrically connected to the first end of the relay K1 of the switching circuit 2, and the first and second gear ends are respectively connected to the corresponding load ends;

[0032] The dimming mode of the dimming circuit can be any one of leading edge phase-cutting control dimming, trailing edge phase-cutting control dimming and PWM dimming;

[0033] The load detection circuit 3 is used to detect whether there is a load connection, and to feed back to the main control, thereby controlling the output of the dimming signal. Figure 2As shown, the load detection circuit 3 includes: a first optocoupler U2 (AC input photoelectric coupler), the anode and cathode of the first optocoupler U2 are connected in parallel with a first capacitor C7, the anode and cathode of the first optocoupler U2 are electrically connected to the first gear end T1 and the second gear end T2 respectively, the anode or cathode of the first optocoupler is connected in series with a first detection resistor R9 and a second detection resistor R10, the control end of the first optocoupler U2 is electrically connected to the first end of the second capacitor C9, the low-voltage power supply end VDD-5V, and the collector of the transistor Q4, the emitter of the first optocoupler U2 is electrically connected to the first end of the first resistor R22 and the base of the transistor Q4, the emitter of the transistor Q4 is electrically connected to the first end of the second resistor R23 and the first end of the third resistor R28, the second end of the third resistor R28 is electrically connected to the main control, the second end of the second capacitor C9, the second end of the first resistor R22, and the second end of the second resistor R23 are electrically connected together and grounded.

[0034] It should be noted that the dimming circuit 1 can refer to Figure 2 As shown, the main control (MCU) can refer to Figure 4 As shown, the LDO step-down circuit can refer to Figure 6 As shown, the AC voltage zero-crossing detection circuit can refer to Figure 7 As shown. The switching power supply buck circuit provides DC-5V power supply, the LDO step-down circuit provides DC-3.3V power supply, the AC voltage zero-crossing detection circuit is used to obtain the zero point of the alternating current, the main control is used to control other circuits, receive external control signals, and feedback the current working state, and the switching circuit is connected to the external load through the first and second gear ends to make output opening and closing switching.

[0035] For dimming control, when the load detection circuit detects that neither the first gear end nor the second gear end is connected to a load, the master control controls the dimming circuit to stop outputting a dimming signal; when the load detection circuit detects that the first gear end or the second gear end is connected to a load, the master control controls the dimming circuit to output a dimming signal.

[0036] Specifically, the load current detection circuit is used to detect the current size of the current load, and to realize the detection of small loads and overcurrent protection. Figure 2 , Figure 3As shown, the load current detection circuit includes: a current transformer TR1, a first winding TR1B of the current transformer TR1 is connected in series to a first end of the relay K1 of the switching circuit, two ends of the second winding TR1A of the current transformer TR1 are connected in parallel with a first diode D6, a second diode D7, and a fourth resistor R29, two ends of the second winding TR1A are connected in series with a fifth resistor R30 and a sixth resistor R31, the first diode D6 and the second diode D7 are configured in reverse, the fifth resistor R30 and the sixth resistor R31 are connected to an operational amplifier, respectively. The positive input 5 and negative input 6 of U3B are electrically connected, the anode terminal of the first diode D6 is grounded, the negative input 6 is electrically connected to the first end of the seventh resistor R32, the second end of the seventh resistor R32 is electrically connected to the low-voltage power supply terminal VDD-5V and the first end of the first filter capacitor C11, the second end of the first filter capacitor C11 is grounded, the output end of the operational amplifier U3B is electrically connected to the first end of the eighth resistor R33, the second end of the eighth resistor R33 is electrically connected to the first end of the Zener diode DZ2 and the main control, and the second end of the Zener diode DZ2 is grounded.

[0037] In addition to the above-mentioned current transformer, the load current detection circuit can also perform load current detection through a power metering chip circuit.

[0038] Specifically, combined Figure 1 , Figure 8 As shown, it also includes: a wireless communication module, the wireless communication module is electrically connected to the main control and the LDO step-down circuit, and the wireless communication module is any one or more of a Wi-Fi module, a Bluetooth module, a Zigbee module, a 4G module, a 5G module and a LoRa module. The main control interacts with the user terminal through the wireless communication module, so that the user can obtain the current status information of the device and perform corresponding control, such as: adjusting the dimming level, opening and closing control, obtaining the current opening and closing status, etc.

[0039] Specifically, combined Figure 1 , Fig. 9 As shown, it also includes: an LED status indication circuit, which is electrically connected to the main control and the LDO step-down circuit. The main control outputs current status information and control information through the LED status indication circuit, such as: load connection status, network status, dimming control status, etc.

[0040] Specifically, combined Figure 1 , Fig.10 As shown, it also includes: a function key circuit, which is electrically connected to the main control and the LDO step-down circuit. The main control obtains the user's control information through the function key circuit, and then performs dimming control, on / off control, etc.

[0041] To summarize, the dual-speed design provided by the above-mentioned device is connected one-to-one with the traditional non-intelligent conversion switch, which solves the problem that users need to modify the circuit when using the intelligent switch. At the same time, it can also provide dimming function and protection function for the lamp. Among them, through the above-mentioned load current detection circuit and load detection circuit detection, the dimming circuit can also realize the rapid response function of the load end (rapid on and off control of the dimming signal), thereby protecting the device itself; in addition, the load detection circuit has lower cost and stronger stability for the load detection of the two gear ends, which reduces the influence of fluctuations on the detection at the device end and the load end, and cooperates with the load current detection circuit to further realize the detection of small loads and achieve the purpose of overcurrent protection.

[0042] The above-described embodiments only express one or more implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. An intelligent dimming control device with protection function, characterized in that: include: A switching power supply buck circuit, wherein the input end of the switching power supply buck circuit is electrically connected to the mains end, the output end of the switching power supply buck circuit is electrically connected to the LDO step-down circuit, and the LDO step-down circuit is electrically connected to the main control; The main control is electrically connected to the dimming circuit, the switching circuit, the load current detection circuit, the load detection circuit, and the AC voltage zero-crossing detection circuit respectively; the AC voltage zero-crossing detection circuit is electrically connected to the mains end; the dimming circuit is electrically connected to the mains end; the first end of the relay of the switching circuit is electrically connected to the dimming circuit; the second end of the relay of the switching circuit is electrically connected to the first gear end and the second gear end respectively; and the load current detection circuit is electrically connected to the first end of the relay of the switching circuit; The load detection circuit includes: a first optocoupler, an anode and a cathode of the first optocoupler are connected in parallel with a first capacitor, the anode and the cathode of the first optocoupler are electrically connected to the first gear end and the second gear end respectively, the anode or cathode of the first optocoupler is connected in series with a first detection resistor and a second detection resistor, the control end of the first optocoupler is electrically connected to the first end of the second capacitor, the low-voltage power supply end, and the collector of the transistor, the emitter of the first optocoupler is electrically connected to the first end of the first resistor and the base of the transistor, the emitter of the transistor is electrically connected to the first end of the second resistor and the first end of the third resistor, the second end of the third resistor is electrically connected to the main control, and the second end of the second capacitor, the second end of the first resistor, and the second end of the second resistor are electrically connected together and grounded.

2. The intelligent dimming control device with protection function according to claim 1, characterized in that: The load current detection circuit includes: a current transformer, a first winding of the current transformer is connected in series to a first end of the relay of the switching circuit, a first diode, a second diode, and a fourth resistor are connected in parallel at two ends of the second winding of the current transformer, a fifth resistor and a sixth resistor are connected in series at two ends of the second winding, respectively, the first diode and the second diode are configured in reverse, the fifth resistor and the sixth resistor are electrically connected to the positive input and the negative input of the operational amplifier, respectively, the anode end of the first diode is grounded, the negative input is electrically connected to the first end of the seventh resistor, the second end of the seventh resistor is electrically connected to the low-voltage power supply end and the first end of the first filter capacitor, the second end of the first filter capacitor is grounded, the output end of the operational amplifier is electrically connected to the first end of the eighth resistor, the second end of the eighth resistor is electrically connected to the negative electrode of the voltage-stabilizing diode and the main control, and the positive electrode of the voltage-stabilizing diode is grounded.

3. The intelligent dimming control device with protection function according to claim 1, characterized in that: The load current detection circuit performs load current detection through a power metering chip circuit.

4. The intelligent dimming control device with protection function according to claim 1, characterized in that: When the load detection circuit detects that neither the first gear end nor the second gear end is connected to a load, the main control controls the dimming circuit to stop outputting a dimming signal; When the load detection circuit detects that the first gear end or the second gear end is connected to a load, the main control controls the dimming circuit to output a dimming signal.

5. The intelligent dimming control device with protection function according to claim 1, characterized in that: Also includes: A wireless communication module is electrically connected to the main control and the LDO step-down circuit.

6. The intelligent dimming control device with protection function according to claim 5, characterized in that: The wireless communication module is any one or more of a Wi-Fi module, a Bluetooth module, a Zigbee module, a 4G module, a 5G module and a LoRa module.

7. The intelligent dimming control device with protection function according to claim 1, characterized in that: Also includes: An LED status indication circuit is electrically connected to the main control and the LDO step-down circuit.

8. The intelligent dimming control device with protection function according to claim 1, characterized in that: Also includes: A function key circuit is electrically connected to the main control and the LDO step-down circuit.

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