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In the era of booming LED industry, how to improve the reliability, efficiency and safety of LED driver circuits? How to reduce the cost of LED driver circuit? How to solve the two technical bottlenecks of LED driver circuit: heat dissipation and size? How to cooperate with LED driver design for different LED lighting applications? 
I=220/(1/jωC1+1/jωC2)
When 1/jωC1>1/jωC2, ​​that is, C1
I≈220jωC1
The above formula shows that when C1
2100mW/2128mW×100%=98.7%
The efficiency of a typical LED lamp driving circuit is about 85%. The AC 220V LED constant current drive circuit is the most efficient compared to the efficiency of various other LED lamp drive circuits. Since the driving circuit does not generate heat, when the driving circuit is used as an LED lamp, a plastic casing is often used as a lamp cover.
Unfinished
For more information, please refer to "High - tech LED - Technology and Applications" December issue 
Commonly used LED power supply constant current power supply is commonly used LED power supply constant current power supply is an integrated circuit composed of rectification, filtering, constant current circuit and so on. Its shortcoming is that the circuit is complicated and the cost is high, and the power consumption of the power circuit itself cannot be ignored. Because of the relatively large power consumption, its power consumption is converted into heat, which makes designers have to consider the heat dissipation problem of the power supply.
[Source: "High - tech LED - Technology and Applications" December issue ]
A commonly used LED-powered constant current power supply is an integrated circuit composed of a rectification, filtering, constant current circuit, and the like. Its shortcoming is that the circuit is complicated and the cost is high, and the power consumption of the power circuit itself cannot be ignored. Because of the relatively large power consumption, its power consumption is converted into heat, which makes designers have to consider the heat dissipation problem of the power supply.
These questions remind the author of the patent he applied for in 2005, the name is "AC 220V LED constant current drive circuit." The circuit does not use power-consuming devices such as resistors, transformers, and triodes. It uses only one bridge stack and two capacitors to form an AC 220V LED constant current drive circuit. Obviously, since the circuit does not use power consuming devices such as resistors, transformers, and triodes, the power consumption of the circuit can be neglected. The driving circuit does not generate heat, so there is no heat to dissipate, so there is no heat dissipation problem. This solves two technical bottlenecks of the LED driving circuit: heat dissipation and size.
Some people may ask, is this a constant current circuit? Can this circuit work? The following circuit analysis proves that it is a constant current circuit.
It can be seen from Fig. 1 that under the condition of 220 V AC, the impedance of the capacitors C1 and C2 in series is 1/jωC1+1/jωC2, ​​and the current I flows through C1 and C2.
How can the constant current flowing through C1 flow to the load LED string? A bridge rectifier circuit is added between C1 and C2 so that the current flowing through C2 and the load is unidirectional, thereby obtaining a direct current and supplying power to the load. As shown in FIG. 2, the AC 220V LED constant current driving circuit is composed of a capacitor C1, a rectifier bridge D, a transient protection, and a filter capacitor C2. The buck current limiting capacitor C1 turns the AC 220V into a low voltage output, and the rectifier circuit formed by the rectifier bridges D1, D2, D3, and D4 is rectified to obtain DC, and then the transient protection and the filter capacitor C2 are filtered to obtain a more stable DC. Current, powering the LED string of the LED. When the circuit is in a steady state, C2 charging ends, the charging current of C2 becomes 0, and the current flowing through C1 flows to the load. The magnitude of this constant current is 220jωC1. Thus, the circuit is a constant current drive circuit.
Above C1
With this AC 220V LED constant current drive circuit, one to dozens of LEDs can be driven. For example, use this AC 220V LED constant current drive circuit to make an AC 220V semiconductor illumination lamp. The circuit principle is shown in Figure 2. C1 uses 400V3 3 4 J, C 2 uses 2 5 0 V10μ, and the load uses 0. 0 7 W, 3 0 Only 2 0 MA LEDs are connected in series. When the on-voltage of the rectifier diode is 0.7V, the power consumption when the rectifier diode is turned on is 20 mA × 0.7 V × 2 = 28 mW. Since the capacitor does not consume power, the power consumption of the AC 220V LED constant current drive circuit is 28MW. The useful power consumption of 30 LED lamps is 2100mW, and the power consumption of AC 220V LED constant current driving circuit is 28mW < total power consumption is 2128mW. It can be seen that the power consumption of the AC 220V LED constant current driving circuit is negligible compared to the total power consumption. The power consumption of the power supply circuit itself is negligible, about 0, which is a micro power supply circuit, and its power consumption is negligible. . The efficiency of the AC 220V LED constant current drive circuit is:
2100mW/2128mW×100%=98.7% The efficiency of the general LED lamp driving circuit is about 85%. The AC 220V LED constant current drive circuit is the most efficient compared to the efficiency of various other LED lamp drive circuits. Since the driving circuit does not generate heat, when the driving circuit is used as an LED lamp, a plastic casing is often used as a lamp cover. LED power supply constant current power supply is commonly used LED power supply constant current power supply is an integrated circuit composed of rectification, filtering, constant current circuit and so on. Its shortcoming is that the circuit is complicated and the cost is high, and the power consumption of the power circuit itself cannot be ignored. Because of the relatively large power consumption, its power consumption is converted into heat, which makes designers have to consider the heat dissipation problem of the power supply.
In the era of booming LED industry, how to improve the reliability, efficiency and safety of LED driver circuits? How to reduce the cost of LED drive circuit?
How to solve the two technical bottlenecks of LED drive circuit: heat dissipation and size? How to cooperate with LED driver design for different LED lighting applications?
These questions remind the author of the patent he applied for in 2005, the name is "AC 220V LED constant current drive circuit." The circuit does not use power-consuming devices such as resistors, transformers, and triodes. It uses only one bridge stack and two capacitors to form an AC 220V LED constant current drive circuit. Obviously, since the circuit does not use power consuming devices such as resistors, transformers, and triodes, the power consumption of the circuit can be neglected. The driving circuit does not generate heat, so there is no heat to dissipate, so there is no heat dissipation problem, which solves the two technical bottlenecks of the LED driving circuit:
Heat and size issues.
Some people may ask, is this a constant current circuit? Can this circuit work? The following circuit analysis proves that it is a constant current circuit.
220jωC1. When an output load is connected in parallel with C2, the impedance of the parallel result is smaller, and it is easier to satisfy the above conditions. The load connected in parallel here is a string of LED light-emitting diodes.
How can the constant current flowing through C1 flow to the load LED string? A bridge rectifier circuit is added between C1 and C2 so that the current flowing through C2 and the load is unidirectional, thereby obtaining a direct current and supplying power to the load. As shown in FIG. 2, the AC 220V LED constant current driving circuit is composed of a capacitor C1, a rectifier bridge D, a transient protection, and a filter capacitor C2. The buck current limiting capacitor C1 turns the AC 220V into a low voltage output, and the rectifier circuit formed by the rectifier bridges D1, D2, D3, and D4 is rectified to obtain DC, and then the transient protection and the filter capacitor C2 are filtered to obtain a more stable DC. Current, powering the LED string of the LED. When the circuit is in a steady state, C2 charging ends, the charging current of C2 becomes 0, and the current flowing through C1 flows to the load. The magnitude of this constant current is 220jωC1. Thus, the circuit is a constant current drive circuit.
Above C1
With this AC 220V LED constant current drive circuit, one to dozens of LEDs can be driven. For example, use this AC 220V LED constant current drive circuit to make an AC 220V semiconductor illumination lamp. The circuit principle is shown in Figure 2. C1 uses 400V3 3 4 J, C 2 uses 2 5 0 V10μ, and the load uses 0. 0 7 W, 3 0 Only 2 0 MA LEDs are connected in series. When the on-voltage of the rectifier diode is 0.7V, the power consumption when the rectifier diode is turned on is 20 mA × 0.7 V × 2 = 28 mW. Since the capacitor does not consume power, the power consumption of the AC 220V LED constant current drive circuit is 28MW. The useful power consumption of 30 LED lamps is 2100mW, and the power consumption of AC 220V LED constant current driving circuit is 28mW < total power consumption is 2128mW. It can be seen that the power consumption of the AC 220V LED constant current driving circuit is negligible compared to the total power consumption. The power consumption of the power supply circuit itself is negligible, about 0, which is a micro power supply circuit, and its power consumption is negligible. . The efficiency of the AC 220V LED constant current drive circuit is:
2100mW/2128mW×100%=98.7% The efficiency of the general LED lamp driving circuit is about 85%. The AC 220V LED constant current drive circuit is the most efficient compared to the efficiency of various other LED lamp drive circuits. Since the driving circuit does not generate heat, when the driving circuit is used as an LED lamp, a plastic casing is often used as a lamp cover. An integrated circuit composed of a rectification, filtering, constant current circuit, or the like. Its shortcoming is that the circuit is complicated and the cost is high, and the power consumption of the power circuit itself cannot be ignored. Because of the relatively large power consumption, its power consumption is converted into heat, which makes designers have to consider the heat dissipation problem of the power supply.
In the era of booming LED industry, how to improve the reliability, efficiency and safety of LED driver circuits? How to reduce the cost of LED drive circuit?
How to solve the two technical bottlenecks of LED drive circuit: heat dissipation and size? How to cooperate with LED driver design for different LED lighting applications?
These questions remind the author of the patent he applied for in 2005, the name is "AC 220V LED constant current drive circuit." The circuit does not use power-consuming devices such as resistors, transformers, and triodes. It uses only one bridge stack and two capacitors to form an AC 220V LED constant current drive circuit. Obviously, since the circuit does not use power consuming devices such as resistors, transformers, and triodes, the power consumption of the circuit can be neglected. The driving circuit does not generate heat, so there is no heat to dissipate, so there is no heat dissipation problem, which solves the two technical bottlenecks of the LED driving circuit:
Heat and size issues.
Some people may ask, is this a constant current circuit? Can this circuit work? The following circuit analysis proves that it is a constant current circuit.
220jωC1. When an output load is connected in parallel with C2, the impedance of the parallel result is smaller, and it is easier to satisfy the above conditions. The load connected in parallel here is a string of LED light-emitting diodes.
How can the constant current flowing through C1 flow to the load LED string? A bridge rectifier circuit is added between C1 and C2 so that the current flowing through C2 and the load is unidirectional, thereby obtaining a direct current and supplying power to the load. As shown in FIG. 2, the AC 220V LED constant current driving circuit is composed of a capacitor C1, a rectifier bridge D, a transient protection, and a filter capacitor C2. The buck current limiting capacitor C1 turns the AC 220V into a low voltage output, and the rectifier circuit formed by the rectifier bridges D1, D2, D3, and D4 is rectified to obtain DC, and then the transient protection and the filter capacitor C2 are filtered to obtain a more stable DC. Current, powering the LED string of the LED. When the circuit is in a steady state, C2 charging ends, the charging current of C2 becomes 0, and the current flowing through C1 flows to the load. The magnitude of this constant current is 220jωC1. Thus, the circuit is a constant current drive circuit.
Above C1
With this AC 220V LED constant current drive circuit, one to dozens of LEDs can be driven. For example, use this AC 220V LED constant current drive circuit to make an AC 220V semiconductor illumination lamp. The circuit principle is shown in Figure 2. C1 uses 400V3 3 4 J, C 2 uses 2 5 0 V10μ, and the load uses 0. 0 7 W, 3 0 Only 2 0 MA LEDs are connected in series. When the on-voltage of the rectifier diode is 0.7V, the power consumption when the rectifier diode is turned on is 20 mA × 0.7 V × 2 = 28 mW. Since the capacitor does not consume power, the power consumption of the AC 220V LED constant current drive circuit is 28MW. The useful power consumption of 30 LED lamps is 2100mW, and the power consumption of AC 220V LED constant current driving circuit is 28mW < total power consumption is 2128mW. It can be seen that the power consumption of the AC 220V LED constant current driving circuit is negligible compared to the total power consumption. The power consumption of the power supply circuit itself is negligible, about 0, which is a micro power supply circuit, and its power consumption is negligible. . The efficiency of the AC 220V LED constant current drive circuit is:
2100mW/2128mW×100%=98.7% The efficiency of the general LED lamp driving circuit is about 85%. The AC 220V LED constant current drive circuit is the most efficient compared to the efficiency of various other LED lamp drive circuits. Since the driving circuit does not generate heat, when the driving circuit is used as an LED lamp, a plastic casing is often used as a lamp cover.