CN205071365U - Emitting diode lighting drive circuit and lamps and lanterns - Google Patents

Abstract

The utility model relates to a light-emitting diode lighting drive circuit, which comprises an input rectifier circuit, an input filter circuit, a control circuit and an output filter circuit connected in sequence. The control circuit includes a JD9521E5 control chip and its peripheral components. The peripheral components include a Resistor, first capacitor, freewheeling diode and energy storage inductor; the control chip includes a power supply pin, a current feedback pin and an input control pin, the first capacitor is connected between the power supply pin of the control chip and the input filter circuit, and the second A resistor is connected between the current feedback pin of the control chip and the input filter circuit, the anode of the freewheeling diode is connected to the input control pin of the control chip, the cathode of the freewheeling diode is connected to the input filter circuit, and one end of the energy storage inductor is connected to the The input control pin of the control chip is connected, and the other end is connected with the output filter circuit. The utility model has low cost.

Description

Light-emitting diode lighting drive circuit and lamps

technical field

The utility model relates to the technical field of circuit driving, in particular to a light-emitting diode lighting driving circuit and a lamp.

Background technique

Since light emitting diodes have the advantages of energy saving, environmental protection and high efficiency, basically do not require maintenance, and have high luminous efficiency, light emitting diodes are more and more popular as lighting sources. Traditional light-emitting diode drive circuits generally use a control chip as the control unit, and the choice of the control chip determines the design of its peripheral circuits.

However, the traditional control chip requires many peripheral circuit elements, and the cost is high.

Utility model content

Based on this, it is necessary to provide a low-cost LED lighting driving circuit and lamp.

A light-emitting diode lighting drive circuit, including sequentially connected input rectifier circuit, input filter circuit, control circuit and output filter circuit, the control circuit includes a control chip model JD9521E5 and its peripheral components, the peripheral components include a first Resistor, first capacitor, freewheeling diode and energy storage inductance;

The control chip includes a power pin, a current feedback pin, and an input control pin, the first capacitor is connected between the power pin of the control chip and the input filter circuit, and the first resistor is connected to Between the current feedback pin of the control chip and the input filter circuit, the anode of the freewheeling diode is connected to the input control pin of the control chip, and the cathode of the freewheeling diode is connected to the input filter circuit One end of the energy storage inductor is connected to the input control pin of the control chip, and the other end is connected to the output filter circuit.

In one embodiment, the control chip includes a main control module, a charging module, a driving module, an undervoltage lockout module, an output constant current control module, and a switch tube;

The main control module is respectively connected to the charging module, the driving module, and the undervoltage lockout module, the common terminal of the charging module and the undervoltage lockout module is used as the power supply pin of the control chip, and the output constant current The control module is connected to the drive module, the control end of the switch tube is connected to the drive module, the low potential end of the switch tube is the current feedback pin of the control chip, and the high potential end of the switch tube is It is an input control pin of the control chip, and the charging module is also connected to the high potential end of the switch tube.

In one embodiment, the control chip further includes an over-temperature protection module, an over-voltage protection module and a short-circuit protection module connected to the main control module.

In one of the embodiments, the input rectification circuit includes a fuse and a rectification bridge, the rectification bridge includes four diodes, and the fuse is connected to the input end of the rectification bridge.

In one of the embodiments, the input filtering circuit includes a second capacitor connected in parallel with the input rectifying circuit.

In one of the embodiments, the output filter circuit includes a third capacitor and a second resistor connected in parallel, the third capacitor is used to further filter the voltage output to the external light source, and the second resistor is connected in parallel to the Both ends of the third capacitor act as a dummy load.

In one of the embodiments, the first resistor and the second resistor are chip resistors.

In one of the embodiments, the first capacitor is a chip capacitor, and the second capacitor and the third capacitor are electrolytic capacitors.

A lamp includes a light source, and further includes the above-mentioned light-emitting diode lighting driving circuit, and the light-emitting diode lighting driving circuit is connected to the light source.

In one of the embodiments, the light source is a bulb lamp bead.

The aforementioned LED lighting drive circuit and lamps use a JD9521E5 control chip, which reduces the cost of the LED lighting drive circuit because the control chip has the advantages of small size, wide voltage, and fewer peripheral components.

Description of drawings

Fig. 1 is a block diagram of an LED lighting drive circuit in an embodiment;

Fig. 2 is a schematic diagram of the LED lighting driving circuit in the embodiment shown in Fig. 1;

Fig. 3 is a block diagram of a control chip in an embodiment;

FIG. 4 is an appearance structure diagram of a control chip in an embodiment.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Please refer to FIG. 1 , which is a block diagram of an LED lighting driving circuit in an embodiment.

The LED lighting drive circuit is a non-isolated step-down constant current drive circuit, including an input rectifier circuit 110 , an input filter circuit 120 , a control circuit 130 and an output filter circuit 140 connected in sequence.

The input rectifier circuit 110 and the input filter circuit 120 are used to realize the conversion from AC to DC, and the control circuit 130 is mainly used to feed back the current, and detect the magnitude of the current at any time and perform adjustment control, so that the output current can be guaranteed to be constant.

Please also combine with FIG. 2 , which is a schematic diagram of the LED lighting driving circuit in the embodiment shown in FIG. 1 .

The input rectification circuit 110 includes a fuse F1 and a full-wave rectification bridge DB1 composed of 4 diodes. The fuse F1 is connected to the input terminal of the rectifier bridge DB1, and is used to prevent the starting overcurrent of the LED lighting driving circuit and play a protective role. The specific model of rectifier bridge DB1 is MB6S. The input filtering circuit 120 includes a second capacitor C2 connected in parallel with the input rectifying circuit 110 .

The input end of the rectifier bridge DB1 is connected to an AC power source for full-wave rectification of the AC power. The second capacitor C2 is connected to the output end of the rectifier bridge DB1 to realize filtering. The AC power is rectified and filtered by the input rectifier circuit 110 and the input filter circuit 120 to become DC power.

The control circuit 130 includes a control chip IC1 and its peripheral components. Specifically, the control chip IC1 includes a power supply pin VDD, a current feedback pin CS, and an input control pin DRAIN, and the peripheral components include a first resistor R1, a first capacitor C1, a freewheeling diode D1, and an energy storage inductor L1. The first capacitor C1 is connected between the power pin VDD of the control chip IC1 and the negative electrode of the second capacitor C2 for supplying power to the power pin VDD of the control chip IC1 so that the control chip IC1 can work stably. The first resistor R1 is connected between the current feedback pin CS of the control chip IC1 and the negative pole of the second capacitor C2 to limit the current, and the output current value of the first resistor R1 can be set. The anode of the freewheeling diode D1 is connected to the input control pin DRAIN of the control chip IC1, the cathode of the freewheeling diode D1 is connected to the positive pole of the second capacitor C2, and the freewheeling diode D1 is used to give The energy storage inductor L1 provides a discharge circuit. One end of the energy storage inductor L1 is connected to the input control pin DRAIN of the control chip IC1 , and the other end is connected to the output filter circuit 140 .

The output filter circuit 140 includes a third capacitor C3 and a second resistor R2 connected in parallel. The third capacitor C3 is used to further filter the output voltage and output a stable voltage to the light source. The second resistor R2 acts as a dummy load.

In one embodiment, the first capacitor C1 and the third capacitor C3 are electrolytic capacitors, and the second capacitor, the first resistor R1 , the second resistor R2 and the freewheeling diode D1 are all chip components. The model of the control chip IC1 is JD9521E5, which integrates a 500V power switch tube inside and is packaged in To-92.

Please refer to FIG. 3 , which is a block diagram of the control chip in an embodiment.

The control chip includes a main control module 210, a charging module 220, a driving module 230, an undervoltage lockout module 240, an output constant current control module 250, an overtemperature protection module 260, an overvoltage protection module 270, a short circuit protection module 280 and a switch M1 .

The main control module is respectively connected to the charging module 220, the driving module 230, the undervoltage lockout module 240, the overtemperature protection module 260, the overvoltage protection module 270, and the short circuit protection module 280, and the common terminal of the charging module 220 and the undervoltage lockout module is used as the The power supply pin VDD of the control chip is connected to the output constant current control module 250 and the driving module 230 . The control end of the switch tube M1 is connected to the drive module 230, the low potential end of the switch tube M1 is the current feedback pin CS of the control chip, the high potential end of the switch tube M1 is the input control pin DRAIN of the control chip, and the charging module 120 is connected to the high potential end of the switch tube M1.

In this embodiment, the switch tube M1 is an N-channel MOS tube, the gate of the N-channel MOS tube is the control terminal of the switch tube M1, and the drain of the N-channel MOS tube is the high potential terminal of the switch tube M1 , the source of the N-channel MOS transistor is the low potential end of the switch transistor M1.

It can be understood that, in other embodiments, the switching transistor M1 may also be other components with functions similar to the N-channel MOS transistor, which is not strictly limited here.

The appearance structure diagram of the control chip is shown in Fig. 4 .

The application of the control chip has the following advantages: wide power supply (85 volts to 265 volts of AC voltage), good constant current characteristics, critical conduction mode, high efficiency, and fewer peripheral components.

The working principle of the light-emitting diode lighting driving circuit is described below in conjunction with Fig. 2 and Fig. 3:

The AC power is rectified by the rectifier bridge DB1 and filtered by the second capacitor C2 to obtain DC power. When the third capacitor C3 is charged to the conduction threshold, the control chip IC1 starts to drive its internal switch tube M1 to switch and complete the startup.

When the switch tube M1 is turned on, the input current passes through the light source, the energy storage inductor L1, the switch tube M1, and the first resistor R1 to the negative pole of the input power supply in sequence. While the light source is emitting light, the current in the energy storage inductor L1 will slowly rise and reach a peak value until the switch tube M1 is turned off, and the energy storage inductor L1 stores energy.

When the switch tube M1 is turned off, since the voltage across the third capacitor C3 cannot be changed suddenly, the current flowing through the energy storage inductor L1 cannot be changed suddenly. The current flowing through the energy storage inductor L1 forms a loop through the freewheeling diode D1 and the light source. The current in the energy storage inductor L1 drops from the peak value to zero, and the switching tube M1 is turned on again, and the switching operation is repeated continuously.

The current of the light source is mainly determined by the resistance value of the first resistor R1 connected to the current feedback pin CS of the control chip IC1. Since the first resistor R1 is connected in series in the main circuit, once the resistance value of the first resistor R1 is determined , when the current of the energy storage inductor L1 continues to increase, the voltage drop generated by the current passing through the two ends of the first resistor R1 also increases continuously, and this voltage is fed back to the current feedback pin CS of the control chip IC1, and is connected with the internal of the control chip IC1 Compared with the reference voltage, when the voltage of the current feedback pin CS reaches the internal voltage threshold, the system turns off the output of the switch tube, so as to achieve the purpose of constant current and provide a constant current.

A lamp is also provided, comprising a light source and the LED lighting driving circuit described above, and the LED lighting driving circuit is connected to the light source.

In one embodiment, the light source is a bulb lamp bead.

Table 1 shows the test results obtained by applying the above LED lighting drive circuit to lamps with different powers.

Table 1:

The aforementioned LED lighting drive circuit and lamps use a JD9521E5 control chip, which reduces the cost of the LED lighting drive circuit because the control chip has the advantages of small size, wide voltage, and fewer peripheral components.

In addition, the light-emitting diode lighting drive circuit has simple structure, high efficiency and stable performance, and can reduce the cost of the drive circuit when used in lamps. After actual testing, applying the above-mentioned light-emitting diode lighting drive circuit to a 3-7W bulb lamp can still achieve a good constant current effect.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the utility model, and the description thereof is relatively specific and detailed, but it should not be understood as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (10)

1. a LED lighting drive circuit, comprise the input rectification circuit, input filter circuit, control circuit and the output filter circuit that connect successively, it is characterized in that, described control circuit comprises the control chip and peripheral cell thereof that model is JD9521E5, and described peripheral cell comprises the first resistance, the first electric capacity, fly-wheel diode and energy storage inductor;

Described control chip comprises power pins, current feedback pin and input control pin, described first electric capacity is connected between the power pins of described control chip and described input filter circuit, described first resistance is connected between the current feedback pin of described control chip and described input filter circuit, the anode of described fly-wheel diode is connected with the input control pin of described control chip, the negative electrode of described fly-wheel diode is connected with described input filter circuit, one end of described energy storage inductor is connected with the input control pin of described control chip, the other end is connected with output filter circuit.

2. LED lighting drive circuit according to claim 1, is characterized in that, described control chip comprises main control module, charging module, driver module, under-voltage locking module, output constant current control module and switching tube;

Described main control module respectively with described charging module, driver module, under-voltage locking model calling, the common port of described charging module and described under-voltage locking module is as the power pins of described control chip, described output constant current control module is connected with described driver module, the control end of described switching tube is connected with described driver module, the cold end of described switching tube is the current feedback pin of described control chip, the hot end of described switching tube is the input control pin of described control chip, and described charging module is also connected with the hot end of described switching tube.

3. LED lighting drive circuit according to claim 2, is characterized in that, described control chip also comprises the overheat protector module, overvoltage protective module and the short circuit protection module that are connected with described main control module.

4. LED lighting drive circuit according to claim 1, is characterized in that, described input rectification circuit comprises fuse and rectifier bridge, and described rectifier bridge comprises four diodes, and described fuse is connected to the input of described rectifier bridge.

5. LED lighting drive circuit according to claim 1, is characterized in that, described input filter circuit comprises with described input rectification circuit and the second electric capacity connect.

6. LED lighting drive circuit according to claim 1, it is characterized in that, described output filter circuit comprises the 3rd electric capacity in parallel and the second resistance, described 3rd electric capacity be used for further filtering is done to the voltage exporting to external light source, described second resistor coupled in parallel at the two ends of described 3rd electric capacity to serve as a dummy load.

7. LED lighting drive circuit according to claim 6, is characterized in that, described first resistance and the second resistance are Chip-R.

8. LED lighting drive circuit according to claim 6, is characterized in that, described first electric capacity is patch capacitor, and described second electric capacity and the 3rd electric capacity are electrochemical capacitor.

9. a light fixture, comprises light source, it is characterized in that, also comprises the LED lighting drive circuit described in any one of claim 1 ~ 8, and described LED lighting drive circuit is connected with described light source.

10. light fixture according to claim 9, is characterized in that, described light source is bulb lamp lamp pearl.