CN210112342U - LED lamp circuit capable of delaying light turn-off - Google Patents

Abstract

The utility model discloses an LED lamp circuit capable of delaying lights out, comprising a delay control circuit, a constant current control circuit, an LED lighting circuit, a rectifier circuit capable of generating a pulse signal with zero output voltage, a filter circuit, and a A trigger conversion circuit that generates a trigger signal from a pulse signal with zero voltage. The live wire input end of the rectifier circuit is used to connect one end of the normally closed switch connected to the live wire of the mains, and the neutral input end of the rectifier circuit is used to connect the mains. Neutral line; the advantage is that the user operates the normally closed switch to realize the delayed light-off, the work reliability is high, and the sensor module does not need to be set, the cost is low, and the size is small.

Description

A kind of LED lamp circuit that can delay lights out

technical field

The utility model relates to an LED lamp circuit, in particular to an LED lamp circuit capable of delaying light-off.

Background technique

In common indoor lighting applications, the mains grid loads the mains power to the access end of the lighting fixtures through switches, so that the lights can be turned on or off by setting the on and off states of the switches. . LED lamps have been widely used due to their advantages of high luminous efficiency, energy saving and environmental protection. LED lights that can be turned off with a delay can automatically turn off the lights after a certain time delay after lighting, and are often used in certain occasions (such as aisles, corridors, etc.) that do not require long-term lighting. At present, the LED lights that can delay the lights out generally have a sensor module that detects whether there is any activity around the light. If the sensor module detects that there is someone moving around, the LED light will automatically turn on. When the person leaves or no one is active, the LED light After the lamp remains on for the set time, it will automatically turn off.

The structure block diagram of the existing LED lamp circuit capable of delaying lights out is shown in Figure 1, which usually includes a rectification filter circuit, a voltage conversion circuit, a sensor module, a delay control circuit, a constant current control circuit and an LED lighting circuit.

The rectifier filter circuit has a live wire input terminal, a neutral wire input terminal, an output terminal and a ground terminal; the rectifier filter circuit is used to convert the AC voltage of the commercial power into a smooth DC voltage; the voltage conversion circuit has an input terminal, a ground terminal and an output terminal; the voltage The conversion circuit converts the DC high voltage at the output end of the rectifier filter circuit into a low voltage DC voltage and outputs it at the output end; the sensor module has a positive electrode, a ground end and an output end, and the sensor module outputs a pulse signal after detecting the signal of someone moving around the LED lamp; The time control circuit has a positive pole, a negative pole, a trigger terminal and an output terminal; a delay period is set in the delay control circuit. After receiving the pulse signal at the trigger terminal, the delay control circuit enters a delay period and outputs "" In each delay period, if the trigger terminal of the delay control circuit does not receive a pulse signal, then when the delay period ends, the delay control circuit outputs a "light off" signal at its output, if In one delay period, when the trigger terminal of the delay control circuit receives the pulse signal, it will re-enter the next delay period of the delay control circuit, and the constant current control current has a positive pole, a control terminal, an output terminal and a ground terminal; constant current control The current controls the constant current on and off of the output terminal through the light-on signal or the light-off signal connected to the control terminal. The LED light-emitting circuit has positive and negative poles. The zero line input terminal of the circuit is connected to the zero line of the commercial power supply, the output terminal of the rectifier filter circuit, the input terminal of the voltage conversion circuit, the positive terminal of the constant current control circuit and the positive terminal of the LED lighting circuit are connected; the output terminal of the voltage conversion circuit, the sensor module The positive pole of the delay control circuit is connected to the positive pole of the delay control circuit, the output terminal of the sensor module is connected to the trigger terminal of the delay control circuit, the output terminal of the delay control circuit is connected to the control terminal of the constant current control circuit, and the output terminal of the constant current control circuit is connected. It is connected to the negative pole of the LED lighting circuit, the ground terminal of the rectification filter circuit, the ground terminal of the voltage conversion circuit, the ground terminal of the sensor module, the negative terminal of the delay control current and the ground terminal of the constant current control circuit are connected.

In practical applications, the above-mentioned LED light circuit that can delay the light-off is always connected to the mains power supply, and the LED light circuit is in a standby state. When the sensor module detects the signal of someone moving around, the output terminal of the sensor module outputs a pulse. Signal, after the trigger terminal of the delay control circuit receives the pulse signal, it outputs a "turn on" signal at its output terminal, and the constant current control circuit receives the "turn on" signal at its control terminal, and its output terminal outputs a constant size The current of the LED light-emitting circuit makes the LED light-emitting circuit emit light, and the LED light is lit. During the delay period of the delay control circuit outputting the "light-on" signal, if the sensor module does not detect the surrounding activity signal, there will be no pulse signal output, then the delay The circuit control circuit outputs a "light off" signal at its output after the delay period expires. After the constant current control circuit receives the "turn off" signal at the control end, the output end of the constant current control circuit is turned off, there is no current output, the LED light-emitting circuit does not emit light, and the LED light is off.

However, the sensor module used in the above-mentioned LED lamp circuit capable of delaying lights off detects whether there is any activity around by detecting sound, infrared or microwave signals. This detection method is easily interfered by other objects (such as animals, etc.) and works reliably. In addition, the sensor module has a high cost and a large size, which leads to a high cost and a large size of the LED lamp circuit.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present utility model is to provide an LED lamp circuit capable of delaying lights out. The LED lamp circuit realizes the delayed lights out by manipulating a normally closed switch connected to the commercial power, without the need to set a sensor module, and the operation is reliable. Higher performance, lower cost and smaller size.

The technical scheme adopted by the present invention to solve the above technical problems is as follows: an LED lamp circuit capable of delaying lights out, including a delay control circuit, a constant current control circuit and an LED lighting circuit, wherein the delay control circuit has a positive electrode, a constant current control circuit and an LED lighting circuit. A negative electrode, a trigger terminal and an output terminal, a delay period is set in the delay control circuit, the constant current control current has a positive terminal, a control terminal, an output terminal and a ground terminal, and the LED lighting circuit has a positive terminal and a ground terminal. negative pole, the output terminal of the delay control circuit is connected to the control terminal of the constant current control current, the output terminal of the constant current control current is connected to the negative pole of the LED lighting circuit, the LED The lamp circuit also includes a rectifier circuit, a filter circuit that can generate a pulse signal with zero output voltage at the moment of disconnecting the commercial power supply, and a trigger conversion circuit that generates a trigger signal when the pulse signal with zero voltage is connected. The rectifier circuit It has a live wire input terminal, a neutral wire input terminal, an output terminal and a ground terminal, the filter circuit has an input terminal, an output terminal and a ground terminal, and the trigger conversion circuit has a positive terminal, an input terminal, an output terminal and a ground terminal. The live wire input end of the rectifier circuit is used to connect one end of the normally closed switch connected to the live wire of the commercial power, the neutral wire input end of the rectifier circuit is used to connect the neutral wire of the commercial power, and the neutral wire of the rectifier circuit. The output end, the input end of the filter circuit are connected with the input end of the trigger conversion circuit, the output end of the filter circuit, the positive electrode of the trigger conversion circuit, and the positive electrode of the delay control circuit , The positive pole of the constant current control circuit is connected with the positive pole of the LED light-emitting circuit, the output end of the trigger conversion circuit is connected with the trigger end of the delay control circuit, and the output end of the delay control circuit is connected. connected to the control terminal of the constant current control circuit, the output terminal of the constant current control circuit is connected to the negative terminal of the LED lighting circuit, the ground terminal of the rectifier circuit, the ground terminal of the filter circuit terminal, the negative terminal of the delay control circuit, the ground terminal of the trigger conversion circuit and the ground terminal of the constant current control circuit are connected.

The trigger conversion circuit includes a first resistor, a second resistor, a third resistor, a first capacitor and a first integrated circuit chip, the model of the first integrated circuit chip is HL2711A, and one end of the first resistor are the input end of the trigger conversion circuit, the other end of the first resistor, one end of the second resistor, one end of the first capacitor, and the fourth end of the first integrated circuit chip pin connection, the first pin of the first integrated circuit chip is connected to the second pin of the first integrated circuit chip, one end of the third resistor is the positive pole of the trigger conversion circuit, the The other end of the third resistor is connected to the third pin of the first integrated circuit chip, the eighth pin of the first integrated circuit chip is the output end of the trigger conversion circuit, the second The other end of the resistor and the other end of the first capacitor are connected to the fifth pin of the first integrated circuit chip, and the connection end is the ground end of the trigger conversion circuit. The output end of the trigger conversion circuit has the characteristics of high voltage resistance, and the cost is low in cooperation with the delay control circuit with high voltage characteristics.

The delay control circuit includes a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second capacitor and a first diode, the second capacitor is an electrolytic capacitor, and the first and second capacitors are The pole tube is a zener diode, one end of the fourth resistor is the anode of the delay control circuit, the other end of the fourth resistor is connected to one end of the fifth resistor, and the first The other end of the fifth resistor is connected to one end of the sixth resistor and the connection end is the trigger end of the delay control circuit, the other end of the sixth resistor is connected to the positive pole of the second capacitor, the The cathode of the second capacitor, the cathode of the first diode and one end of the seventh resistor are connected and the connection end is the output end of the delay control circuit, the first diode The positive pole of the tube is connected to the other end of the seventh resistor, and the connection terminal is the negative pole of the delay control circuit. The delay control circuit is realized by RC circuit structure, and the cost is low.

The constant current control circuit includes a second integrated circuit chip, an eighth resistor and a ninth resistor, the model of the second integrated circuit chip is SM2083E, and one end of the ninth resistor is the constant current control circuit The positive pole of the circuit, the other end of the ninth resistor is connected to the first pin of the second integrated circuit chip, and the fourth pin of the second integrated circuit chip is controlled by the constant current control circuit The eighth pin of the second integrated circuit chip is the output end of the constant current control circuit, the fifth pin of the second integrated circuit chip is connected to one end of the eighth resistor, so The other end of the eighth resistor is connected to the third pin of the second integrated circuit chip, and the connection end is the ground end of the constant current control circuit. The constant-current control circuit is realized by a linear constant-current control circuit, which has low cost, does not generate high-frequency signals that interfere with the power grid, does not need to use an EMI circuit, and reduces the cost of the overall LED lamp circuit.

The filter circuit includes a second diode and a third capacitor, the third capacitor is an electrolytic capacitor, the anode of the second diode is the input end of the filter circuit, and the third capacitor is an electrolytic capacitor. The negative pole of the second diode is connected to the positive pole of the third capacitor and its connection terminal is the output terminal of the filter circuit, and the negative pole of the third capacitor is the ground terminal of the filter circuit.

The rectifier circuit is realized by a full-bridge rectifier bridge stack, the first pin of the full-bridge rectifier bridge stack is the live wire input end of the rectifier circuit, and the third pin of the full-bridge rectifier bridge stack is the The zero line input end of the rectifier circuit, the second pin of the full-bridge rectifier bridge stack is the output end of the rectifier circuit, and the fourth pin of the full-bridge rectifier bridge stack is the rectifier circuit. the ground terminal.

The LED light-emitting circuit is formed by a plurality of LED light-emitting units in parallel, each of the LED light-emitting units is formed by a plurality of LED light-emitting diodes in series, and the positive parallel terminals of the plurality of LED light-emitting units are the LEDs. The positive pole of the light-emitting circuit, and the parallel terminals of the negative poles of the several LED light-emitting units are the negative poles of the LED light-emitting circuit.

Compared with the prior art, the advantage of the present utility model lies in that by arranging a rectifier circuit, a filter circuit and a trigger conversion circuit, the rectifier circuit is connected to the mains through a normally closed switch, and the voltage of the mains is loaded to the LED lamp through the normally closed switch. On the circuit, the LED light circuit is always in the standby state. When the user operates the control switch to open and close it first, the output terminal of the rectifier circuit generates a pulse signal with zero output voltage, and triggers the conversion circuit to receive the zero output voltage. After receiving the trigger signal, the control end of the delay control circuit generates a light-on signal at its output end, and the control end of the constant-current control circuit generates a light-on signal at its output end after receiving the light-on signal. The output terminal outputs a constant current to make the LED light-emitting circuit emit light within the delay period of the delay control circuit. During the delay period of the delay control circuit outputting the light-on signal, if the trigger conversion circuit receives a pulse with zero output voltage again signal, then the delay circuit control circuit enters the next delay cycle. If the trigger conversion circuit does not receive a pulse signal with an output voltage of zero again, then the delay circuit control circuit outputs a light off at its output after the delay cycle ends. Signal, after the constant current control circuit receives the light off signal at the control end, the output end of the constant current control circuit is turned off, there is no current output, the LED light-emitting circuit does not emit light, and the LED light is extinguished, so that the utility model is operated by the user. The closed switch is used to realize the delayed light-off, the work reliability is high, the sensor module is not required, the cost is low, and the size is small.

Description of drawings

FIG. 1 is a structural block diagram of an existing LED lamp circuit capable of delaying lights out;

Fig. 2 is the structural block diagram of the LED lamp circuit capable of delaying lights out of the present invention;

FIG. 3 is a circuit diagram of an LED lamp circuit capable of delaying light-off according to the present invention.

Detailed ways

The present utility model will be further described in detail below with reference to the embodiments of the accompanying drawings.

Embodiment: As shown in Figure 2, an LED lamp circuit capable of delaying lights out, including a delay control circuit, a constant current control circuit and an LED lighting circuit, the delay control circuit has a positive electrode, a negative electrode, a trigger terminal and an output terminal, A delay period is set in the delay control circuit, the constant current control current has a positive pole, a control terminal, an output terminal and a ground terminal, the LED lighting circuit has a positive pole and a negative pole, the output terminal of the delay control circuit and the control terminal of the constant current control current The output terminal of the constant current control current is connected to the negative pole of the LED lighting circuit. The LED lamp circuit also includes a rectifier circuit and a filter circuit that can generate a pulse signal with zero output voltage when the mains is disconnected. A trigger conversion circuit that generates a trigger signal when the pulse signal is generated. The rectifier circuit has a live wire input terminal, a neutral wire input terminal, an output terminal and a ground terminal, the filter circuit has an input terminal, an output terminal and a ground terminal, and the trigger conversion circuit has a positive terminal, an input terminal, an input terminal and a ground terminal. terminal, output terminal and ground terminal, the live wire input terminal of the rectifier circuit is used to connect one end of the normally closed switch connected to the live wire of the commercial power, the neutral wire input terminal of the rectifier circuit is used to connect the neutral wire of the commercial power The output end, the input end of the filter circuit and the input end of the trigger conversion circuit are connected, the output end of the filter circuit, the positive electrode of the trigger conversion circuit, the positive electrode of the delay control circuit, the positive electrode of the constant current control circuit and the positive electrode of the LED lighting circuit are connected, The output end of the trigger conversion circuit is connected with the trigger end of the delay control circuit, the output end of the delay control circuit is connected with the control end of the constant current control circuit, the output end of the constant current control circuit is connected with the negative electrode of the LED lighting circuit, and the rectifier circuit The ground terminal of the filter circuit, the negative terminal of the delay control circuit, the ground terminal of the trigger conversion circuit and the ground terminal of the constant current control circuit are connected.

In this embodiment, as shown in FIG. 3 , the trigger conversion circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1 and a first integrated circuit chip U1. The model of the first integrated circuit chip U1 is It is HL2711A, one end of the first resistor R1 is the input end of the trigger conversion circuit, the other end of the first resistor R1, one end of the second resistor R2, one end of the first capacitor C1 is connected to the 4th pin of the first integrated circuit chip U1 , the first pin of the first integrated circuit chip U1 is connected to the second pin of the first integrated circuit chip U1, one end of the third resistor R3 is the positive electrode of the trigger conversion circuit, and the other end of the third resistor R3 is connected to the first integrated circuit chip. The third pin of U1 is connected, the eighth pin of the first integrated circuit chip U1 is the output end of the trigger conversion circuit, the other end of the second resistor R2, the other end of the first capacitor C1 and the fifth end of the first integrated circuit chip U1 The pin is connected and its connection end is the ground end of the trigger conversion circuit. The output end of the trigger conversion circuit has the characteristics of high voltage resistance, and the cost is low in cooperation with the delay control circuit with high voltage characteristics.

In this embodiment, as shown in FIG. 3 , the delay control circuit includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a second capacitor C2 and a first diode D1, and the second The capacitor C2 is an electrolytic capacitor, the first diode D1 is a zener diode, one end of the fourth resistor R4 is the anode of the delay control circuit, the other end of the fourth resistor R4 is connected to one end of the fifth resistor R5, and the fifth resistor The other end of R5 is connected to one end of the sixth resistor R6 and its connection end is the trigger end of the delay control circuit, the other end of the sixth resistor R6 is connected to the positive electrode of the second capacitor C2, the negative electrode of the second capacitor C2, the first The cathode of the diode D1 is connected to one end of the seventh resistor R7 and its connection end is the output end of the delay control circuit, the anode of the first diode D1 is connected to the other end of the seventh resistor R7 and its connection end is the delay time control circuit. When the negative pole of the control circuit. The delay control circuit is realized by RC circuit structure, and the cost is low.

In this embodiment, as shown in FIG. 3 , the constant current control circuit includes a second integrated circuit chip U2, an eighth resistor R8 and a ninth resistor R9, the model of the second integrated circuit chip U2 is SM2083E, and one end of the ninth resistor R9 It is the positive pole of the constant current control circuit. The other end of the ninth resistor R9 is connected to the first pin of the second integrated circuit chip U2. The fourth pin of the second integrated circuit chip U2 is the control end of the constant current control circuit. The 8th pin of the circuit chip U2 is the output end of the constant current control circuit, the 5th pin of the second integrated circuit chip U2 is connected to one end of the eighth resistor R8, and the other end of the eighth resistor R8 is connected to the second integrated circuit chip U2. The third pin is connected and its connection terminal is the ground terminal of the constant current control circuit. The constant-current control circuit is realized by a linear constant-current control circuit, which has low cost, does not generate high-frequency signals that interfere with the power grid, does not need to use an EMI circuit, and reduces the cost of the overall LED lamp circuit.

In this embodiment, as shown in FIG. 3 , the filter circuit includes a second diode D2 and a third capacitor C3, the third capacitor C3 is an electrolytic capacitor, the anode of the second diode D2 is the input end of the filter circuit, and the third capacitor C3 is an electrolytic capacitor. The cathode of the second diode D2 is connected to the anode of the third capacitor C3 and its connection terminal is the output terminal of the filter circuit, and the cathode of the third capacitor C3 is the ground terminal of the filter circuit.

In this embodiment, as shown in FIG. 3 , the rectifier circuit is implemented by a full-bridge rectifier bridge stack Db, the first pin of the full-bridge rectifier bridge stack Db is the live wire input end of the rectifier circuit, and the third pin of the full-bridge rectifier bridge stack Db It is the zero line input end of the rectifier circuit, the second pin of the full-bridge rectifier bridge stack Db is the output end of the rectifier circuit, and the fourth pin of the full-bridge rectifier bridge stack Db is the ground end of the rectifier circuit.

In this embodiment, as shown in FIG. 3 , the LED light-emitting circuit is formed by several LED light-emitting units in parallel, each LED light-emitting unit is formed by several LED light-emitting diodes (LED1-LEDn) in series, and n is an integer greater than or equal to 1 The positive parallel terminals of several LED lighting units are the positive terminals of the LED lighting circuit, and the negative parallel terminals of the several LED lighting units are the negative terminals of the LED lighting circuit.

Claims (7)

1. An LED lamp circuit capable of delaying light-off comprises a delay control circuit, a constant current control circuit and an LED light-emitting circuit, wherein the delay control circuit is provided with an anode, a cathode, a trigger end and an output end, a delay period is set in the delay control circuit, a constant current control current is provided with an anode, a control end, an output end and a grounding end, the LED light-emitting circuit is provided with an anode and a cathode, the output end of the delay control circuit is connected with the control end of the constant current control current, the output end of the constant current control current is connected with the cathode of the LED light-emitting circuit, and the LED lamp circuit is characterized by further comprising a rectifying circuit, a filtering circuit and a trigger conversion circuit, wherein the rectifying circuit and the filtering circuit can generate a pulse signal with zero output voltage when the mains supply is disconnected, the trigger conversion circuit can generate a trigger signal when the pulse signal with zero output voltage is accessed, the rectifier circuit is provided with a live wire input end, a zero line input end, an output end and a grounding end, the filter circuit is provided with an input end, an output end and a grounding end, the trigger conversion circuit is provided with a positive electrode, an input end, an output end and a grounding end, the live wire input end of the rectifier circuit is used for connecting one end of a normally closed switch connected with the live wire of the commercial power, the zero line input end of the rectifier circuit is used for connecting the zero line of the commercial power, the output end of the rectifier circuit, the input end of the filter circuit and the input end of the trigger conversion circuit are connected, the output end of the filter circuit, the positive electrode of the trigger conversion circuit, the positive electrode of the delay control circuit, the positive electrode of the constant current control circuit and the positive electrode of the LED light-emitting circuit are connected, and the output end of the trigger conversion circuit is connected with the triggering, the output end of the delay control circuit is connected with the control end of the constant current control circuit, the output end of the constant current control circuit is connected with the negative electrode of the LED light-emitting circuit, and the grounding end of the rectifying circuit, the grounding end of the filter circuit, the negative electrode of the delay control circuit, the grounding end of the trigger switching circuit and the grounding end of the constant current control circuit are connected.

2. The LED lamp circuit capable of delaying time for extinguishing a lamp according to claim 1, wherein the trigger switching circuit comprises a first resistor, a second resistor, a third resistor, a first capacitor and a first integrated circuit chip, the first integrated circuit chip has a model number HL2711A, one end of the first resistor is the input end of the trigger switching circuit, the other end of the first resistor, one end of the second resistor, one end of the first capacitor and the 4 th pin of the first integrated circuit chip are connected, the 1 st pin of the first integrated circuit chip is connected with the 2 nd pin of the first integrated circuit chip, one end of the third resistor is the positive electrode of the trigger switching circuit, the other end of the third resistor is connected with the 3 rd pin of the first integrated circuit chip, the 8 th pin of the first integrated circuit chip is the output end of the trigger switching circuit, the other end of the second resistor, the other end of the first capacitor and the 5 th pin of the first integrated circuit chip are connected, and the connecting end of the second resistor and the connecting end of the first capacitor is the grounding end of the trigger conversion circuit.

3. The LED lamp circuit according to claim 1, wherein the delay control circuit comprises a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a second capacitor and a first diode, the second capacitor is an electrolytic capacitor, the first diode is a voltage regulator diode, one end of the fourth resistor is an anode of the delay control circuit, the other end of the fourth resistor is connected with one end of the fifth resistor, the other end of the fifth resistor is connected with one end of the sixth resistor, and the connection end thereof is a trigger end of the delay control circuit, the other end of the sixth resistor is connected with an anode of the second capacitor, a cathode of the first diode and one end of the seventh resistor are connected, and the connection end thereof is an output end of the delay control circuit, the anode of the first diode is connected with the other end of the seventh resistor, and the connecting end of the first diode is the cathode of the delay control circuit.

4. The LED lamp circuit capable of delaying light-off according to claim 1, wherein the constant current control circuit comprises a second integrated circuit chip, an eighth resistor and a ninth resistor, the model of the second integrated circuit chip is SM2083E, one end of the ninth resistor is the positive pole of the constant current control circuit, the other end of the ninth resistor is connected with the 1 st pin of the second integrated circuit chip, the 4 th pin of the second integrated circuit chip is the control end of the constant current control circuit, the 8 th pin of the second integrated circuit chip is the output end of the constant current control circuit, the 5 th pin of the second integrated circuit chip is connected with one end of the eighth resistor, the other end of the eighth resistor is connected with the 3 rd pin of the second integrated circuit chip, and the connecting end of the eighth resistor is the grounding end of the constant current control circuit.

5. The LED lamp circuit capable of delaying light turn-off according to claim 1, wherein the filter circuit comprises a second diode and a third capacitor, the third capacitor is an electrolytic capacitor, the anode of the second diode is the input terminal of the filter circuit, the cathode of the second diode is connected with the anode of the third capacitor and the connection terminal thereof is the output terminal of the filter circuit, and the cathode of the third capacitor is the ground terminal of the filter circuit.

6. The LED lamp circuit according to claim 1, wherein the rectifying circuit is implemented by a full bridge rectifier, the first leg of the full bridge rectifier is the live wire input of the rectifying circuit, the second leg of the full bridge rectifier is the zero wire input of the rectifying circuit, the second leg of the full bridge rectifier is the output of the rectifying circuit, and the fourth leg of the full bridge rectifier is the ground terminal of the rectifying circuit.

7. The LED lamp circuit capable of delaying light turn-off according to claim 1, wherein the LED light-emitting circuit is formed by connecting a plurality of LED light-emitting units in parallel, each LED light-emitting unit is formed by connecting a plurality of LED light-emitting diodes in series, the parallel connection end of the anodes of the plurality of LED light-emitting units is the anode of the LED light-emitting circuit, and the parallel connection end of the cathodes of the plurality of LED light-emitting units is the cathode of the LED light-emitting circuit.

Images