CN211267165U - Quick reset control circuit of intelligent LED device and LED driving power supply - Google Patents

Abstract

The utility model relates to a fast reset control circuit and LED driving power supply of an intelligent LED device. The input end of the AC-DC conversion circuit in the reset control circuit is connected to the AC power supply end, and the first output end and the second output end of the AC-DC conversion circuit are connected to the LED to supply power to the LED. The first output end of the AC-DC conversion circuit is respectively connected to the input end of the voltage detection circuit and the first input end of the switch circuit, the output end of the voltage detection circuit is connected to the second input end of the switch circuit, and the output end of the switch circuit is connected to the power supply end of the single-chip microcomputer MCU. The voltage detection circuit can detect the voltage change of the first output end of the AC-DC conversion circuit, and then control the on and off of the switch circuit. When the switch circuit is turned on, the single-chip microcomputer MCU is powered, and when the switch circuit is turned off, the single-chip microcomputer MCU is stopped from being powered. The utility model can quickly reset in a short time, avoid the shortcomings of long reset waiting and difficult operation control, and has simple operation, fast reset and high success rate.

Description

A fast reset control circuit and LED drive power supply for an intelligent LED device

technical field

The utility model relates to the field of LED driving power supply, in particular to a fast reset control circuit of an intelligent LED device and an LED driving power supply.

Background technique

With the rapid development of Internet informatization, in recent years, intelligent LED power supply devices can be seen everywhere in production and life. Under normal circumstances, when the LED intelligent control device is first installed, it needs to communicate with terminal equipment such as mobile phones, tablets, and desktop computers. The single-chip MCU inside the LED intelligent control device needs to initialize the program. The amplifier can perform intelligent operations such as switching and dimming.

Sometimes when an LED device has an operation failure, it is necessary to initialize and reset the internal microcontroller MCU, or when adding or reducing LED devices in the same area, or when the system is upgraded, it is necessary to re-install each LED device. reset operation. General system upgrade or MCU reset will provide two reset methods:

1. Wireless upgrade and reset through terminal operation.

2. Upgrade and reset through the mains switch.

The second method is the operation method used when the first method is inconvenient to operate or when you want to reset multiple LED devices at the same time (for example, define the single-chip MCU to be powered on and off three times, and the interval between each power-on and power-off is within 3 seconds. Then the single-chip MCU will automatically perform an initialization reset after identifying this reset condition). For the second reset method, the conventional operation is only suitable for LED loads with relatively low output voltage. For LEDs with relatively high output voltage, the reset time will generally be relatively long, and the operator subjectively determines the interval between operation and reset. , it is easy to cause misjudgment and misoperation, resulting in unsuccessful reset, need to re-operate or perform multiple reset operations.

Utility model content

The technical problem to be solved by the present invention is to provide a quick reset control circuit and an LED driving power supply of an intelligent LED device in view of the above-mentioned defects of the prior art.

The technical solution adopted by the utility model to solve the technical problem is as follows: constructing a quick reset control circuit of an intelligent LED device, including an AC-DC conversion circuit, the input end of the AC-DC conversion circuit is connected to the AC power supply end, the The first output end and the second output end of the AC-DC conversion circuit are connected to the LED to supply power to the LED, and an electrolytic capacitor CE is connected between the first output end and the second output end of the AC-DC conversion circuit; it also includes a voltage Detection circuit and switch circuit;

The first output end of the AC-DC conversion circuit is respectively connected to the input end of the voltage detection circuit and the first input end of the switch circuit, and the output end of the voltage detection circuit is connected to the second input of the switch circuit The output end of the switch circuit is connected to the power supply end of the single-chip MCU, and the switch circuit supplies power to the single-chip MCU when the switch circuit is turned on, and stops powering the single-chip MCU when the switch circuit is disconnected;

The voltage detection circuit includes a transistor Q1, a zener diode ZD1, a resistor R1, a resistor R2, and a resistor R3. The negative electrode of the zener diode ZD1 is connected to the first output end of the AC-DC conversion circuit. The positive pole of ZD1 is connected to the base of the transistor Q1 through the resistor R1, and the base of the transistor Q1 is grounded through the resistor R3; if the transistor Q1 is a PNP type transistor, the emitter of the transistor Q1 passes through The resistor R2 is connected to the first output terminal of the AC-DC conversion circuit, and the emitter of the transistor Q1 is connected to the second input terminal of the switching circuit; if the transistor Q1 is an NPN type transistor, the transistor Q1 The collector of the transistor Q1 is connected to the first output terminal of the AC-DC conversion circuit through the resistor R2, and the collector of the transistor Q1 is connected to the second input terminal of the switching circuit.

Further, in the fast reset control circuit of the intelligent LED device of the present invention, the switch circuit includes a transistor Q, a zener diode ZD, and a resistor R, and the transistor Q1 is a PNP type transistor;

The base of the transistor Q is connected to the emitter of the transistor Q1, the base of the transistor Q is connected to the cathode of the Zener diode ZD, and the positive pole of the Zener diode ZD is grounded; the collector of the transistor Q Connected to the first output terminal of the AC-DC conversion circuit, the base of the transistor Q is connected to the collector of the transistor Q through the resistor R; the emitter of the transistor Q is connected to the power supply terminal of the microcontroller MCU.

Further, in the fast reset control circuit of the intelligent LED device of the present invention, the switch circuit includes a transistor Q, a transistor Q2, a zener diode ZD, and a resistor R, and the transistor Q1 and the transistor Q2 are NPN type triode;

The base of the triode Q2 is connected to the collector of the triode Q1, the collector of the triode Q2 is connected to the base of the triode Q, the emitter of the triode Q2 is grounded; the base of the triode Q is connected to the The cathode of the Zener diode ZD, the anode of the Zener diode ZD is grounded; the collector of the transistor Q is connected to the first output end of the AC-DC conversion circuit, and the base of the transistor Q passes through the resistor R is connected to the collector of the triode Q; the emitter of the triode Q is connected to the power supply terminal of the microcontroller MCU.

Further, in the fast reset control circuit of the smart LED device according to the present invention, the switch circuit includes a DC switch chip, an inductor L, a diode D, and a resistor R4, the transistor Q1 is a PNP type transistor, and the DC switch When the enable pin EN of the chip receives a low level, the power supply output pin of the DC switch chip has no voltage;

The emitter of the transistor Q1 is connected to the enable pin EN of the DC switch chip, and the enable pin EN of the DC switch chip is grounded through the resistor R4; the power supply input pin of the DC switch chip is connected to the ground. The first output terminal of the AC-DC conversion circuit, the power supply output pin of the DC switch chip is connected to the power supply terminal of the single-chip MCU through the inductor L; the power supply terminal of the single-chip MCU is connected to the cathode of the diode D, and the diode The positive pole of D is grounded.

Further, in the fast reset control circuit of the smart LED device according to the present invention, the switch circuit includes a DC switch chip, an inductor L, a diode D, a resistor R4, and a triode Q2, and the triode Q1 and the triode Q2 are NPN type triode, when the enable pin EN of the DC switch chip receives a low level, the power supply output pin of the DC switch chip has no voltage;

The base of the transistor Q2 is connected to the collector of the transistor Q1, the collector of the transistor Q2 is connected to the enable pin EN of the DC switch chip, and the emitter of the transistor Q2 is grounded; the DC switch chip The enable pin EN is grounded through the resistor R4; the power supply input pin of the DC switch chip is connected to the first output end of the AC-DC conversion circuit, and the power supply output pin of the DC switch chip is connected to the The inductor L is connected to the power supply terminal of the single chip MCU; the power supply terminal of the single chip MCU is connected to the cathode of the diode D, and the anode of the diode D is grounded.

Further, in the fast reset control circuit of the smart LED device according to the present invention, the switch circuit includes a DC switch chip, an inductor L, a diode D, and a resistor R4, the transistor Q1 is a PNP type transistor, and the DC switch When the enable pin EN of the chip receives a high level, the power supply output pin of the DC switch chip has no voltage;

The collector of the transistor Q1 is connected to the enable pin EN of the DC switch chip, and the enable pin EN of the DC switch chip is grounded through the resistor R4; the power supply input pin of the DC switch chip is connected to the ground. The first output terminal of the AC-DC conversion circuit, the power supply output pin of the DC switch chip is connected to the power supply terminal of the single-chip MCU through the inductor L; the power supply terminal of the single-chip MCU is connected to the cathode of the diode D, and the diode The positive pole of D is grounded.

Further, in the fast reset control circuit of the smart LED device according to the present invention, the switch circuit includes a DC switch chip, an inductor L, a diode D, a resistor R4, and a triode Q2, and the triode Q1 and the triode Q2 are NPN type triode, when the enable pin EN of the DC switch chip receives a high level, the power supply output pin of the DC switch chip has no voltage;

The base of the transistor Q2 is connected to the collector of the transistor Q1, the collector of the transistor Q2 is connected to the enable pin EN of the DC switch chip, and the emitter of the transistor Q2 is grounded; the DC switch chip The enable pin EN is grounded through the resistor R4; the power supply input pin of the DC switch chip is connected to the first output end of the AC-DC conversion circuit, and the power supply output pin of the DC switch chip is connected to the The inductor L is connected to the power supply terminal of the single chip MCU; the power supply terminal of the single chip MCU is connected to the cathode of the diode D, and the anode of the diode D is grounded.

Further, the fast reset control circuit of the smart LED device of the present invention further includes a capacitor Ci, and the first output end of the AC-DC conversion circuit is grounded through the capacitor Ci.

Further, the fast reset control circuit of the intelligent LED device of the present invention further includes a capacitor Co, and the power supply end of the single chip MCU is grounded through the capacitor Co.

In addition, the present invention also provides an LED driving power supply, which includes the fast reset control circuit of the above-mentioned intelligent LED device.

Implementing the quick reset control circuit and LED driving power supply of an intelligent LED device of the present invention has the following beneficial effects: the present invention can perform quick reset in a short time, avoiding the shortcomings of long-time reset waiting and difficult operation, Simple operation, quick reset and high success rate.

Description of drawings

The utility model will be further described below in conjunction with the accompanying drawings and embodiments, in the accompanying drawings:

1 is a circuit diagram of a fast reset control circuit of a smart LED device provided by an embodiment;

2 is a circuit diagram of a fast reset control circuit of a smart LED device provided by an embodiment;

3 is a circuit diagram of a fast reset control circuit of a smart LED device provided by an embodiment;

FIG. 4 is a circuit diagram of a fast reset control circuit of a smart LED device according to an embodiment.

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

Example

Referring to FIG. 1 , the fast reset control circuit of the smart LED device of this embodiment includes an AC-DC conversion circuit, the input end of the AC-DC conversion circuit is connected to the AC power supply end, and the first output end and the second output end of the AC-DC conversion circuit are connected. The terminal is connected to the LED to supply power to the LED, and an electrolytic capacitor CE is connected between the first output terminal and the second output terminal of the AC-DC conversion circuit; and a voltage detection circuit and a switch circuit are also included. The first output end of the AC-DC conversion circuit is respectively connected to the input end of the voltage detection circuit and the first input end of the switch circuit, the output end of the voltage detection circuit is connected to the second input end of the switch circuit, and the output end of the switch circuit is connected to the single chip MCU When the switch circuit is turned on, it supplies power to the single-chip MCU, and when the switch circuit is disconnected, it stops supplying power to the single-chip MCU.

The voltage detection circuit includes a transistor Q1, a zener diode ZD1, a resistor R1, a resistor R2, and a resistor R3. The negative electrode of the zener diode ZD1 is connected to the first output terminal of the AC-DC conversion circuit, and the positive electrode of the zener diode ZD1 is connected to the triode through the resistor R1. The base of Q1, the base of the transistor Q1 is grounded through the resistor R3; the transistor Q1 is a PNP type transistor, the emitter of the transistor Q1 is connected to the first output of the AC-DC conversion circuit through the resistor R2, and the emitter of the transistor Q1 is connected to the switch the second input of the circuit.

The switch circuit includes a transistor Q, a Zener diode ZD, and a resistor R. The transistor Q1 is a PNP type transistor; the base of the transistor Q is connected to the emitter of the transistor Q1, and the base of the transistor Q is connected to the negative pole of the Zener diode ZD, and the Zener diode ZD The positive pole of the transistor Q is grounded; the collector of the transistor Q is connected to the first output terminal of the AC-DC conversion circuit, the base of the transistor Q is connected to the collector of the transistor Q through the resistor R; the emitter of the transistor Q is connected to the power supply terminal of the microcontroller MCU.

The fast reset control circuit of the smart LED device in this embodiment further includes a capacitor Ci, and the first output end of the AC-DC conversion circuit is grounded through the capacitor Ci.

The fast reset control circuit of the smart LED device in this embodiment further includes a capacitor Co, and the power supply end of the single chip MCU is grounded through the capacitor Co.

The working principle of this embodiment is:

When the alternating current at the input terminal of the AC-DC conversion circuit is normally input, the first output terminal and the second output terminal of the AC-DC conversion circuit output a normal voltage value voltage. At this time, the Zener diode ZD1 works in a breakdown state, and the transistor Q1 The base does not work because of the high level, and the control point A maintains the high potential, so that the output terminal of the switch circuit is powered normally, that is, the power supply of the emitter of the transistor Q is normal, and the single-chip MCU works normally.

After the AC power at the input end of the AC-DC conversion circuit is turned off, the output voltage Vo of the first output end of the AC-DC conversion circuit decreases accordingly. value), the Zener diode ZD1 no longer breaks down, and is equivalent to an open circuit, then the base of the transistor Q1 is at a low level. At this time, the transistor Q1 is turned on, and the voltage at point A is controlled to be pulled down, so that the transistor Q has no output, that is The emitter of the transistor Q has no power supply, and the single-chip MCU is quickly powered off.

In the above process, from the AC input AC INPUT is turned off to the single-chip MCU does not work, the whole process does not exceed 3 seconds, so the AC input ACINPUT can be powered on and off three times in a short time, and the single-chip MCU also changes with the specified time. The reset action is performed after the power is turned on and off for 3 times, so that the reset operation belt becomes fast and convenient.

This embodiment can perform quick reset in a short time, avoid the shortcomings of long reset waiting and difficult operation control, and has simple operation, quick reset and high success rate.

Example

Referring to FIG. 2 , the fast reset control circuit of the smart LED device of this embodiment includes an AC-DC conversion circuit, the input end of the AC-DC conversion circuit is connected to the AC power supply end, and the first output end and the second output of the AC-DC conversion circuit are The terminal is connected to the LED to supply power to the LED, and an electrolytic capacitor CE is connected between the first output terminal and the second output terminal of the AC-DC conversion circuit; and a voltage detection circuit and a switch circuit are also included. The first output end of the AC-DC conversion circuit is respectively connected to the input end of the voltage detection circuit and the first input end of the switch circuit, the output end of the voltage detection circuit is connected to the second input end of the switch circuit, and the output end of the switch circuit is connected to the single chip MCU When the switch circuit is turned on, it supplies power to the single-chip MCU, and when the switch circuit is disconnected, it stops supplying power to the single-chip MCU.

The voltage detection circuit includes a transistor Q1, a zener diode ZD1, a resistor R1, a resistor R2, and a resistor R3. The negative electrode of the zener diode ZD1 is connected to the first output terminal of the AC-DC conversion circuit, and the positive electrode of the zener diode ZD1 is connected to the triode through the resistor R1. The base of Q1, the base of the transistor Q1 is grounded through the resistor R3; the transistor Q1 is an NPN transistor, the collector of the transistor Q1 is connected to the first output of the AC-DC conversion circuit through the resistor R2, and the collector of the transistor Q1 is connected to the switch circuit of the second input.

The switch circuit includes a transistor Q, a transistor Q2, a Zener diode ZD, and a resistor R. The transistor Q1 and the transistor Q2 are NPN transistors, the base of the transistor Q2 is connected to the collector of the transistor Q1, and the collector of the transistor Q2 is connected to the base of the transistor Q. , the emitter of the transistor Q2 is grounded; the base of the transistor Q is connected to the cathode of the Zener diode ZD, and the positive pole of the Zener diode ZD is grounded; the collector of the transistor Q is connected to the first output of the AC-DC conversion circuit, and the base of the transistor Q is connected to the ground. The pole is connected to the collector of the transistor Q through the resistor R; the emitter of the transistor Q is connected to the power supply terminal of the single-chip MCU.

The working principle of this embodiment is:

When the alternating current of the input terminal of the AC-DC conversion circuit is normally input, the first output terminal and the second output terminal of the AC-DC conversion circuit output the normal voltage value voltage, at this time the Zener diode ZD1 works in the breakdown state, the transistor Q1 and Transistor Q2 does not work due to high level, and control point A to maintain high potential, so that the output end of the switch circuit is powered normally, that is, the emitter of transistor Q is powered normally, and the single-chip MCU works normally.

After the AC power at the input end of the AC-DC conversion circuit is turned off, the output voltage Vo of the first output end of the AC-DC conversion circuit decreases accordingly. value), the Zener diode ZD1 no longer breaks down, and it is equivalent to an open circuit, then the base of the transistor Q1 is at a low level. At this time, the transistor Q1 and the transistor Q2 are turned on, and the voltage at the control point A is pulled down, so that the transistor Q has no The output, that is, the emitter of the transistor Q has no power supply, and the single-chip MCU is quickly powered off.

In the above process, from the AC input AC INPUT is turned off to the single-chip MCU does not work, the whole process does not exceed 3 seconds, so the AC input ACINPUT can be powered on and off three times in a short time, and the single-chip MCU also changes with the specified time. The reset action is performed after the power is turned on and off for 3 times, so that the reset operation belt becomes fast and convenient.

This embodiment can perform quick reset in a short time, avoid the shortcomings of long reset waiting and difficult operation control, and has simple operation, quick reset and high success rate.

Example

Referring to FIG. 3 , the fast reset control circuit of the smart LED device of this embodiment includes an AC-DC conversion circuit, the input end of the AC-DC conversion circuit is connected to the AC power supply end, and the first output end and the second output of the AC-DC conversion circuit are The terminal is connected to the LED to supply power to the LED, and an electrolytic capacitor CE is connected between the first output terminal and the second output terminal of the AC-DC conversion circuit; and a voltage detection circuit and a switch circuit are also included. The first output end of the AC-DC conversion circuit is respectively connected to the input end of the voltage detection circuit and the first input end of the switch circuit, the output end of the voltage detection circuit is connected to the second input end of the switch circuit, and the output end of the switch circuit is connected to the single chip MCU When the switch circuit is turned on, it supplies power to the single-chip MCU, and when the switch circuit is disconnected, it stops supplying power to the single-chip MCU.

The voltage detection circuit includes a transistor Q1, a zener diode ZD1, a resistor R1, a resistor R2, and a resistor R3. The negative electrode of the zener diode ZD1 is connected to the first output terminal of the AC-DC conversion circuit, and the positive electrode of the zener diode ZD1 is connected to the triode through the resistor R1. The base of Q1, the base of the transistor Q1 is grounded through the resistor R3; the transistor Q1 is a PNP type transistor, the emitter of the transistor Q1 is connected to the first output of the AC-DC conversion circuit through the resistor R2, and the emitter of the transistor Q1 is connected to the switch the second input of the circuit.

The switch circuit includes a DC switch chip (dc/dc in the figure), an inductor L, a diode D, and a resistor R4. The transistor Q1 is a PNP type transistor. The enable pin EN of the DC switch chip receives a low level when the power supply output of the DC switch chip leads. The pin has no voltage; the emitter of the transistor Q1 is connected to the enable pin EN of the DC switch chip, and the enable pin EN of the DC switch chip is grounded through the resistor R4; the power supply input pin of the DC switch chip is connected to the first AC-DC conversion circuit. An output terminal, the power supply output pin of the DC switch chip is connected to the power supply terminal of the single-chip MCU through the inductor L; the power supply terminal of the single-chip MCU is connected to the cathode of the diode D, and the anode of the diode D is grounded.

The fast reset control circuit of the smart LED device in this embodiment further includes a capacitor Ci, and the first output end of the AC-DC conversion circuit is grounded through the capacitor Ci.

The fast reset control circuit of the smart LED device in this embodiment further includes a capacitor Co, and the power supply end of the single chip MCU is grounded through the capacitor Co.

The working principle of this embodiment is:

When the alternating current at the input terminal of the AC-DC conversion circuit is normally input, the first output terminal and the second output terminal of the AC-DC conversion circuit output a normal voltage value voltage. At this time, the Zener diode ZD1 works in the breakdown state, and the transistor Q1 When the high level does not work, control point A to maintain a high potential, so that the enable pin EN of the DC switch chip is at a high level, and the enable pin EN of the DC switch chip receives a high level when the power supply output pin of the DC switch chip The normal voltage is output, and the microcontroller MCU works normally.

After the AC power at the input end of the AC-DC conversion circuit is turned off, the output voltage Vo of the first output end of the AC-DC conversion circuit decreases accordingly. value), the Zener diode ZD1 no longer breaks down, and it is equivalent to an open circuit, then the base of the transistor Q1 is at a low level. At this time, the transistor Q1 is turned on, and the voltage at point A is controlled to be pulled down, and the enable of the DC switch chip leads to When the pin EN receives a low level, the power supply output pin of the DC switch chip has no voltage, and the single-chip MCU is quickly powered off.

In the above process, from the AC input AC INPUT is turned off to the single-chip MCU does not work, the whole process does not exceed 3 seconds, so the AC input ACINPUT can be powered on and off three times in a short time, and the single-chip MCU also changes with the specified time. The reset action is performed after the power is turned on and off for 3 times, so that the reset operation belt becomes fast and convenient.

This embodiment can perform quick reset in a short time, avoid the shortcomings of long reset waiting and difficult operation control, and has simple operation, quick reset and high success rate.

Example

The difference between this embodiment and the previous embodiment is that the switch circuit in the fast reset control circuit of the smart LED device in this embodiment includes a DC switch chip, an inductor L, a diode D, a resistor R4, and a transistor Q2. The transistor Q1 and the transistor Q2 are NPN type triode, when the enable pin EN of the DC switch chip receives a low level, the power supply output pin of the DC switch chip has no voltage. The base of the transistor Q2 is connected to the collector of the transistor Q1, the collector of the transistor Q2 is connected to the enable pin EN of the DC switch chip, and the emitter of the transistor Q2 is grounded; the enable pin EN of the DC switch chip is grounded through the resistor R4; DC The power supply input pin of the switch chip is connected to the first output terminal of the AC-DC conversion circuit, and the power supply output pin of the DC switch chip is connected to the power supply terminal of the single-chip MCU through the inductor L; the power supply terminal of the single-chip MCU is connected to the cathode of the diode D, and the diode D The positive pole is grounded.

In this embodiment, the transistor Q1 and the transistor Q2 are NPN type transistors. The combination of the transistor Q1 and the transistor Q2 can realize the function of the transistor Q1 in the previous embodiment, and other working principles can refer to the previous embodiment.

Example

Referring to FIG. 4 , the fast reset control circuit of the smart LED device of this embodiment includes an AC-DC conversion circuit, the input end of the AC-DC conversion circuit is connected to the AC power supply end, and the first output end and the second output of the AC-DC conversion circuit are connected. The terminal is connected to the LED to supply power to the LED, and an electrolytic capacitor CE is connected between the first output terminal and the second output terminal of the AC-DC conversion circuit; and a voltage detection circuit and a switch circuit are also included. The first output end of the AC-DC conversion circuit is respectively connected to the input end of the voltage detection circuit and the first input end of the switch circuit, the output end of the voltage detection circuit is connected to the second input end of the switch circuit, and the output end of the switch circuit is connected to the single chip MCU When the switch circuit is turned on, it supplies power to the single-chip MCU, and when the switch circuit is disconnected, it stops supplying power to the single-chip MCU.

The voltage detection circuit includes a transistor Q1, a zener diode ZD1, a resistor R1, a resistor R2, and a resistor R3. The negative electrode of the zener diode ZD1 is connected to the first output terminal of the AC-DC conversion circuit, and the positive electrode of the zener diode ZD1 is connected to the triode through the resistor R1. The base of Q1, the base of the transistor Q1 is grounded through the resistor R3; the transistor Q1 is a PNP type transistor, the emitter of the transistor Q1 is connected to the first output of the AC-DC conversion circuit through the resistor R2, and the emitter of the transistor Q1 is connected to the switch the second input of the circuit.

The switch circuit includes a DC switch chip, an inductor L, a diode D, and a resistor R4. The transistor Q1 is a PNP transistor. When the enable pin EN of the DC switch chip receives a high level, the power supply output pin of the DC switch chip has no voltage. The collector of the transistor Q1 is connected to the enable pin EN of the DC switch chip, and the enable pin EN of the DC switch chip is grounded through the resistor R4; the power supply input pin of the DC switch chip is connected to the first output of the AC-DC conversion circuit, The power supply output pin of the DC switch chip is connected to the power supply terminal of the single-chip MCU through the inductor L; the power supply terminal of the single-chip MCU is connected to the cathode of the diode D, and the anode of the diode D is grounded.

The working principle of this embodiment is:

When the alternating current at the input terminal of the AC-DC conversion circuit is normally input, the first output terminal and the second output terminal of the AC-DC conversion circuit output a normal voltage value voltage. At this time, the Zener diode ZD1 works in the breakdown state, and the transistor Q1 High level does not work, control point A to maintain low potential, so that the enable pin EN of the DC switch chip is low level, and the enable pin EN of the DC switch chip receives the low level when the power supply output pin of the DC switch chip The normal voltage is output, and the microcontroller MCU works normally.

After the AC power at the input end of the AC-DC conversion circuit is turned off, the output voltage Vo of the first output end of the AC-DC conversion circuit decreases accordingly. value), the Zener diode ZD1 no longer breaks down, and it is equivalent to an open circuit, then the base of the transistor Q1 is at a low level. At this time, the transistor Q1 is turned on, and the voltage at point A is controlled to increase, and the enable pin of the DC switch chip When EN receives a high level, the power supply output pin of the DC switch chip has no voltage, and the single-chip MCU is quickly powered off.

In the above process, from the AC input AC INPUT is turned off to the single-chip MCU does not work, the whole process does not exceed 3 seconds, so the AC input ACINPUT can be powered on and off three times in a short time, and the single-chip MCU also changes with the specified time. The reset action is performed after the power is turned on and off for 3 times, so that the reset operation belt becomes fast and convenient.

This embodiment can perform quick reset in a short time, avoid the shortcomings of long reset waiting and difficult operation control, and has simple operation, quick reset and high success rate.

Example

The difference between this embodiment and the previous embodiment is that the switch circuit in the fast reset control circuit of the smart LED device in this embodiment includes a DC switch chip, an inductor L, a diode D, a resistor R4, and a transistor Q2. The transistor Q1 and the transistor Q2 are NPN type triode, when the enable pin EN of the DC switch chip receives a high level, the power supply output pin of the DC switch chip has no voltage. The base of the transistor Q2 is connected to the collector of the transistor Q1, the collector of the transistor Q2 is connected to the enable pin EN of the DC switch chip, and the emitter of the transistor Q2 is grounded; the enable pin EN of the DC switch chip is grounded through the resistor R4; DC The power supply input pin of the switch chip is connected to the first output terminal of the AC-DC conversion circuit, and the power supply output pin of the DC switch chip is connected to the power supply terminal of the single-chip MCU through the inductor L; the power supply terminal of the single-chip MCU is connected to the cathode of the diode D, and the diode D The positive pole is grounded.

In this embodiment, the transistor Q1 and the transistor Q2 are NPN type transistors. The combination of the transistor Q1 and the transistor Q2 can realize the function of the transistor Q1 in the previous embodiment, and other working principles can refer to the previous embodiment.

Example

The LED driving power supply of this embodiment includes the fast reset control circuit of the smart LED device of the above-mentioned embodiment.

This embodiment can perform quick reset in a short time, avoid the shortcomings of long reset waiting and difficult operation control, and has simple operation, quick reset and high success rate.

The above embodiments are only for illustrating the technical concept and characteristics of the present invention, and the purpose thereof is to enable those who are familiar with the technology to understand the content of the present invention and implement accordingly, and cannot limit the protection scope of the present invention. All equivalent changes and modifications made with the scope of the claims of the present utility model shall belong to the scope of the claims of the present utility model.

Claims (10)

1. A fast reset control circuit for an intelligent LED device, comprising an AC-DC conversion circuit, an input end of the AC-DC conversion circuit is connected to an AC power supply end, and a first output end and a second output end of the AC-DC conversion circuit are connected. The output end is connected to the LED to supply power to the LED, and an electrolytic capacitor CE is connected between the first output end and the second output end of the AC-DC conversion circuit; it is characterized in that it also includes a voltage detection circuit and a switch circuit; The first output end of the AC-DC conversion circuit is respectively connected to the input end of the voltage detection circuit and the first input end of the switch circuit, and the output end of the voltage detection circuit is connected to the second input of the switch circuit The output end of the switch circuit is connected to the power supply end of the single-chip MCU, and the switch circuit supplies power to the single-chip MCU when the switch circuit is turned on, and stops powering the single-chip MCU when the switch circuit is disconnected; The voltage detection circuit includes a transistor Q1, a zener diode ZD1, a resistor R1, a resistor R2, and a resistor R3. The negative electrode of the zener diode ZD1 is connected to the first output end of the AC-DC conversion circuit. The positive pole of ZD1 is connected to the base of the transistor Q1 through the resistor R1, and the base of the transistor Q1 is grounded through the resistor R3; if the transistor Q1 is a PNP type transistor, the emitter of the transistor Q1 passes through The resistor R2 is connected to the first output terminal of the AC-DC conversion circuit, and the emitter of the transistor Q1 is connected to the second input terminal of the switching circuit; if the transistor Q1 is an NPN type transistor, the transistor Q1 The collector of the transistor Q1 is connected to the first output terminal of the AC-DC conversion circuit through the resistor R2, and the collector of the transistor Q1 is connected to the second input terminal of the switching circuit. 2. The fast reset control circuit of an intelligent LED device according to claim 1, wherein the switch circuit comprises a transistor Q, a zener diode ZD, and a resistor R, and the transistor Q1 is a PNP type transistor; The base of the transistor Q is connected to the emitter of the transistor Q1, the base of the transistor Q is connected to the cathode of the Zener diode ZD, and the positive pole of the Zener diode ZD is grounded; the collector of the transistor Q Connected to the first output terminal of the AC-DC conversion circuit, the base of the transistor Q is connected to the collector of the transistor Q through the resistor R; the emitter of the transistor Q is connected to the power supply terminal of the microcontroller MCU. 3. The fast reset control circuit of the smart LED device according to claim 1, wherein the switch circuit comprises a transistor Q, a transistor Q2, a zener diode ZD, and a resistor R, the transistor Q1 and the transistor Q2 It is an NPN type triode; The base of the triode Q2 is connected to the collector of the triode Q1, the collector of the triode Q2 is connected to the base of the triode Q, the emitter of the triode Q2 is grounded; the base of the triode Q is connected to the The cathode of the Zener diode ZD, the anode of the Zener diode ZD is grounded; the collector of the transistor Q is connected to the first output end of the AC-DC conversion circuit, and the base of the transistor Q passes through the resistor R is connected to the collector of the triode Q; the emitter of the triode Q is connected to the power supply terminal of the microcontroller MCU. 4. The fast reset control circuit of an intelligent LED device according to claim 1, wherein the switch circuit comprises a DC switch chip, an inductor L, a diode D, and a resistor R4, and the transistor Q1 is a PNP type transistor, so the When the enable pin EN of the DC switch chip receives a low level, the power supply output pin of the DC switch chip has no voltage; The emitter of the transistor Q1 is connected to the enable pin EN of the DC switch chip, and the enable pin EN of the DC switch chip is grounded through the resistor R4; the power supply input pin of the DC switch chip is connected to the ground. The first output terminal of the AC-DC conversion circuit, the power supply output pin of the DC switch chip is connected to the power supply terminal of the single-chip MCU through the inductor L; the power supply terminal of the single-chip MCU is connected to the cathode of the diode D, and the diode The positive pole of D is grounded. 5. The fast reset control circuit of the smart LED device according to claim 1, wherein the switch circuit comprises a DC switch chip, an inductor L, a diode D, a resistor R4, a transistor Q2, the transistor Q1 and the The transistor Q2 is an NPN type transistor, and when the enable pin EN of the DC switch chip receives a low level, the power supply output pin of the DC switch chip has no voltage; The base of the transistor Q2 is connected to the collector of the transistor Q1, the collector of the transistor Q2 is connected to the enable pin EN of the DC switch chip, and the emitter of the transistor Q2 is grounded; the DC switch chip The enable pin EN is grounded through the resistor R4; the power supply input pin of the DC switch chip is connected to the first output end of the AC-DC conversion circuit, and the power supply output pin of the DC switch chip is connected to the The inductor L is connected to the power supply terminal of the single chip MCU; the power supply terminal of the single chip MCU is connected to the cathode of the diode D, and the anode of the diode D is grounded. 6 . The fast reset control circuit of the smart LED device according to claim 1 , wherein the switch circuit comprises a DC switch chip, an inductor L, a diode D, and a resistor R4 , and the transistor Q1 is a PNP type transistor. 7 . When the enable pin EN of the DC switch chip receives a high level, the power supply output pin of the DC switch chip has no voltage; The collector of the transistor Q1 is connected to the enable pin EN of the DC switch chip, and the enable pin EN of the DC switch chip is grounded through the resistor R4; the power supply input pin of the DC switch chip is connected to the ground. The first output terminal of the AC-DC conversion circuit, the power supply output pin of the DC switch chip is connected to the power supply terminal of the single-chip MCU through the inductor L; the power supply terminal of the single-chip MCU is connected to the cathode of the diode D, and the diode The positive pole of D is grounded. 7. The fast reset control circuit of the smart LED device according to claim 1, wherein the switch circuit comprises a DC switch chip, an inductor L, a diode D, a resistor R4, a transistor Q2, the transistor Q1 and the The transistor Q2 is an NPN type transistor, and the power supply output pin of the DC switch chip has no voltage when the enable pin EN of the DC switch chip receives a high level; The base of the transistor Q2 is connected to the collector of the transistor Q1, the collector of the transistor Q2 is connected to the enable pin EN of the DC switch chip, and the emitter of the transistor Q2 is grounded; the DC switch chip The enable pin EN is grounded through the resistor R4; the power supply input pin of the DC switch chip is connected to the first output end of the AC-DC conversion circuit, and the power supply output pin of the DC switch chip is connected to the The inductor L is connected to the power supply terminal of the single chip MCU; the power supply terminal of the single chip MCU is connected to the cathode of the diode D, and the anode of the diode D is grounded. 8 . The fast reset control circuit of the smart LED device according to claim 1 , further comprising a capacitor Ci, and the first output end of the AC-DC conversion circuit is grounded through the capacitor Ci. 9 . 9 . The fast reset control circuit of the smart LED device according to claim 1 , further comprising a capacitor Co, and the power supply end of the single chip MCU is grounded through the capacitor Co. 10 . 10. An LED driving power supply, characterized in that it comprises the fast reset control circuit of the smart LED device according to any one of claims 1-9.

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