CN203136274U - High-power-factor LED drive power supply circuit of AP3770 chip - Google Patents
High-power-factor LED drive power supply circuit of AP3770 chip Download PDFInfo
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- CN203136274U CN203136274U CN 201320120643 CN201320120643U CN203136274U CN 203136274 U CN203136274 U CN 203136274U CN 201320120643 CN201320120643 CN 201320120643 CN 201320120643 U CN201320120643 U CN 201320120643U CN 203136274 U CN203136274 U CN 203136274U
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Abstract
The utility model relates to a high-power-factor LED drive power supply circuit of an AP3770 chip. An AC input protection circuit of the circuit is output to a rectification and power factor correction circuit after being connected to an external power supply, and the rectification and power factor correction circuit is output to a power-on power supplying circuit, a drain electrode clamping protection circuit, a drive power supply control chip power supplying circuit and a high-frequency transformer. The power-on power supplying circuit is connected with a control chip AP3770 in an AP3770 power supply control circuit and is used for supplying power to the control chip AP3770 when power is turned on. The output of the drive power supply control chip power supplying circuit is connected with the control chip AP3770 in the AP3770 power supply control circuit and is used for providing stable DC voltages for the control chip AP3770. The output of the high-frequency transformer is connected with the input of a DC output circuit of an LED lamp drive power supply, and the output of the drain electrode clamping protection circuit is connected with a high-power drive tube Q1 in the AP3770 power supply control circuit. The drive power supply is composed of the AP3770 serving as the control chip from the BCD company and an peripheral circuit that is optimized for multiple times, is more than 0.9 in terms of the power factor and is above 85% in terms of the efficiency, enables multi-protection to be realized and is low in cost.
Description
Technical field
The utility model belongs to the applied technical field of AP3770 chip, especially a kind of LED driving power circuit of AP3770 chip of High Power Factor.
Background technology
The LED driving power is the key components of LED lamp, LED (LightEmittingDiode) light-emitting diode.The characteristics of LED are very obvious, long, the high and low radiation of light efficiency of life-span and low-power consumption.But the LED lamp not only has only LED, also drive circuit must be arranged; The requirement of the driving power of LED is near harshness, and this is that characteristic by LED determines that this has increased the drive circuit development difficulty; Because the problem of driving power, the advantage of LED lamp can be had a greatly reduced quality; The performance of LED lamp is said in some sense and is depended on drive circuit thus.The driving power of research high efficiency, low cost, high reliability becomes the key that the LED lamp is promoted, popularized.Send out and to change ring money [2013] 188 notices, in " semiconductor lighting energy-saving estate planning " main task special column 2 new materials, equipment and the key technology that six ministries and commissions formulate, just key technology is classified in, cheaply LED driving power exploitation efficient, highly reliable development as.
The LED lamp is a light, and the industrial chain of vast market, LED lamp is driving driving power producer and occurring like the mushrooms after rain, because 1 standard of low-power LED lamp is unclear, so the low-power driving power is very different on the present market, has a long way to go.Subject matter is reliability, life-span, stability and the cost proportion in the whole LED lamp of driving power.
Driving power circuit is the integrated application of electronic technology, LED is the low voltage drive of 2～3V, can not directly connect the 220V alternating current, must design complicated translation circuit, and the LED of different purposes, be equipped with different power supply adaptors, design a good driving power and must take all factors into consideration several factors, because the effect of driving power in the whole LED lamp is the same like human heart.At present, LED lamp driving power source scheme majority is core with a certain producer control chip, is equipped with the peripheral element road; What type of drive was current has two kinds: constant pressure source of the first is for a plurality of constant-current sources, and each constant-current source is given every paths of LEDs power supply separately.This mode, combination is flexible, and a paths of LEDs fault do not influence other LED work, but cost can be slightly higher.Another kind is direct constant current power supply, the operation of LED serial or parallel connection.Its advantage is that cost is a little low, but very flexible also needs to solve certain LED fault, does not influence the problem of other LED operation.These two kinds of forms can be parallel in a period of time.Multiple constant current output supply power mode can be later main flow direction better at cost and aspect of performance.
The LED lamp driving power source is the assurance of the development of LED industrial chain, the quality of LED driving power is directly restricting the LED reliability of products, driving power is the weakest link of LED light fixture, serious hysteresis LED lamp pearl development, therefore in LED industrial chain perfect today progressively, LED driving power ripe most important.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of LED driving power circuit of AP3770 chip of High Power Factor is provided.
The utility model solves its technical problem and takes following technical scheme to realize:
A kind of LED driving power circuit of AP3770 chip of High Power Factor; innovative point of the present utility model is; this circuit comprises the interchange input protection circuit; rectification and circuit of power factor correction; the start power supply circuits; the drain electrode clamping protective circuit; driving power control chip power supply circuits; high frequency transformer; AP3770 power control circuit and LED lamp driving power source dc output circuit; exchange and export to rectification and circuit of power factor correction after input protection circuit inserts external electrical network 220V power supply; the interchange that rectification and circuit of power factor correction will be imported changes direct current into through bridge rectifier; and carry out exporting to the start power supply circuits after the power factor correction; the drain electrode clamping protective circuit; driving power control chip power supply circuits and high frequency transformer; the start power supply circuits are connected with control chip AP3770 in the AP3770 power control circuit; when start, give control chip AP3770 power supply; the output of driving power control chip power supply circuits is connected with control chip AP3770 in the AP3770 power control circuit; for providing galvanic current, control chip AP3770 operate as normal presses; the output of high frequency transformer is connected with the input of LED lamp driving power source dc output circuit, and the output of drain electrode clamping protective circuit is connected with the high-power driving pipe Q1 in the AP3770 power control circuit.
And, described AP3770 power control circuit comprises control chip AP3770, capacitor C 2, resistance R 4, R5, R6, R7, R8 and high-power driving pipe Q1, capacitor C 2 is connected between control chip AP3770 pin 5 and the ground, resistance R 4 is connected between the Na winding positive terminal of control chip AP3770 pin 6 and high frequency transformer, resistance R 5 is connected between control chip AP3770 pin 6 and the ground, resistance R 8 is connected between high-power driving pipe Q1 source electrode and the ground, resistance R 6 is connected between high-power driving pipe Q1 grid and the source electrode, the grid of high-power driving pipe Q1 is connected with control chip AP3770 pin 1, resistance R 7 one ends are connected on the control chip AP3770 pin 4, the other end is connected on the node of resistance R 8 and high-power driving pipe Q1 source electrode, control chip AP3770 pin 2 ground connection.
Advantage of the present utility model and good effect are:
1, the High Power Factor LED lamp driving power source of the utility model AP3770 chip, power factor can reach more than 0.9.
2, the utility model driving power is control chip with the AP3770 of BCD company, is equipped with through the peripheral circuit of Multiple Optimization to form.Accomplished that High Power Factor reaches more than 0.9, efficient reaches more than 85 ﹪ multiple protective, low cost.
3, the utility model line work is stable, and produces facility, the advantage that cost is low.
Description of drawings
Fig. 1 is schematic circuit of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model embodiment is further described: it is emphasized that the utility model embodiment is illustrative, can not be with present embodiment as to restriction of the present utility model.
A kind of LED driving power circuit of AP3770 chip of High Power Factor; as shown in Figure 1; this circuit comprises interchange input protection circuit 1; rectification and circuit of power factor correction 2; start power supply circuits 3; drain electrode clamping protective circuit 4; driving power control chip power supply circuits 5; high frequency transformer 6; AP3770 power control circuit 7 and LED lamp driving power source dc output circuit 8; exchange and export to rectification and circuit of power factor correction 2 after input protection circuit 1 inserts external electrical network 220V power supply; the interchange that rectification and circuit of power factor correction 2 will be imported changes direct current into through bridge rectifier; and carry out exporting to start power supply circuits 3 after the power factor correction; drain electrode clamping protective circuit 4; driving power control chip power supply circuits 5 and high frequency transformer 6; start power supply circuits 3 are connected with control chip AP3770 in the AP3770 power control circuit 7; when start, give control chip AP3770 power supply; the output of driving power control chip power supply circuits 5 is connected with control chip AP3770 in the AP3770 power control circuit 7; for providing galvanic current, control chip AP3770 operate as normal presses; the output of high frequency transformer 6 is connected with the input of LED lamp driving power source dc output circuit 8; the output of drain electrode clamping protective circuit 4 is connected with high-power driving pipe Q1, and the high-power driving pipe Q1 external to AP3770 protects.
Wherein, exchanging input protection circuit 1 is made up of cartridge fuse F1, negative tempperature coefficient thermistor R0, the bold and vigorous capacitor C 0 of input filter, inductance L 0; cartridge fuse F1 one end connects of outside 220V power supply; other end serial connection negative tempperature coefficient thermistor R0; inductance L 0 one ends connect another of outside 220V power supply; the end of the other end and negative tempperature coefficient thermistor R0 is jointly as the output that exchanges input protection circuit 1, and input filter capacitor C0 is connected in parallel on the two ends of outside 220V input power supply.
Cartridge fuse F1 and negative tempperature coefficient thermistor R0 are the overcurrent protections of input circuit, and when the electric current that passes through when cartridge fuse surpassed 1.25～1.5 times of rated current, the fuse of cartridge fuse will quick fuse; Negative tempperature coefficient thermistor is energising moment current-limiting protection, and the effect of capacitor C 0 is that the high order harmonic component of filtering power supply is disturbed, and surge current and outside, internal electromagnetic were disturbed (EMI) effect of drawing up when inductance had circuit to open.
Wherein, rectification and circuit of power factor correction 2 are by bridge rectifier D 1～D4; diode D05, D06, D07; electrochemical capacitor C01, C02 form; between the D1 and D2 of bridge rectifier; the output of the node place incoming transport input protection circuit 1 between D3 and the D4; capacitor C 01 is with after diode D05 connects; capacitor C 02 and the output two ends that are connected in parallel on bridge rectifier D 1～D4 after diode D07 connects respectively, diode D06 is connected on capacitor C 01 and diode D05 and capacitor C 02 and the node that diode D07 is connected.
The effect of circuit is that the interchange that will import changes direct current into through bridge rectifier, and adopt current follow-up circuit to carry out power factor correction, to improve the power factor value of circuit, circuit of power factor correction (PFC) operation principle is: force the transient change track of AC line current floating voltage waveform, make electric current and voltage keep same-phase.
Wherein, start power supply circuits 3 are made up of resistance R 1 and the R2 of series connection, one end of this series circuit is connected the output of rectification and circuit of power factor correction 2, the other end is connected with the pin 3 of control chip AP3770, the effect of start power supply circuits 3 is to give control chip AP3770 power supply when start, to guarantee operate as normal when driving power starts.
Wherein, drain electrode clamping protective circuit 4 is made up of diode D6, resistance R 9, capacitor C 3; resistance R 9 is connected in series with diode D6 with capacitor C 3 backs in parallel; one end of this drain electrode clamping protective circuit 4 is connected with the output of bridge rectifier D 1～D4; the drain electrode of high-power driving pipe Q1 in the other end and the AP3770 power control circuit 7 is connected; its effect is that the external high-power driving pipe Q1 of AP3770 is protected, in case high power valve is breakdown.
This driving power is a single-end flyback switching power supply, whenever power tube by conducting become by the time, will produce peak voltage and induced voltage on the winding of Switching Power Supply.Peak voltage wherein is to form owing to there is leakage inductance (being the self-induction that leakage inductance produces) in high frequency transformer, and high direct voltage U1 and induced voltage Uor that the back generation is sprinkled in it and rectification filter are superimposed, and are added in the drain electrode of power tube, are easy to damage power tube.For this reason, must increase the clamped protective circuit of drain electrode, carry out clamped or absorption to peak voltage.Resistance R 3 and capacitor C 4 are absorber elements, and D6 is blocking diode, form R, C, the clamped circuit of VD type.
Wherein, driving power control chip power supply circuits 5 are made up of diode D5, capacitor C 4, electric capacity R3 and transformer Na winding, capacitor C 4 is with after electric capacity R3 is in parallel, one end connects the ground end of Na winding, be connected with the anode of transformer Na winding behind the other end serial connection diode D5, driving power control chip power supply circuits 5 are behind circuit start, induced voltage by the Na winding produces direct voltage through rectifying and wave-filtering, presses for the control chip AP3770 operate as normal in the AP3770 power control circuit 7 provides galvanic current.Power initiation moment control chip AP3970 is by R1, R2 power supply, and R1, R2 have just finished task behind the circuit start.
Wherein, high frequency transformer 6 is high frequency transformer T1, and its input winding has Na winding and Np winding, and its output winding is the Ns winding.High frequency transformer is the vitals of Switching Power Supply, and it plays the effect of storage power, transmission energy.
Wherein, LED lamp driving power source dc output circuit 8 is made up of high frequency transformer Ns winding, the filter capacitor C5 and the load resistance R10 that are serially connected in the fast recovery diode D7 of Ns winding output cathode end and are connected in parallel on Ns winding two ends.
Wherein, AP3770 power control circuit 7 is control circuits of driving power, comprise control chip AP3770, capacitor C 2, resistance R 4, R5, R6, R7, R8 and high-power driving pipe Q1, direct current output building-out capacitor C2 is connected between control chip AP3770 pin 5 and the ground, resistance R 4, R5 is former limit feedback voltage sampling resistor, resistance R 4 is connected between control chip AP3770 pin 6 and the Na winding positive terminal, resistance R 5 is connected between control chip AP3770 pin 6 and the ground, resistance R 4, the ratio of R5 and Transformer Winding ratio determine the height of output voltage, resistance R 8 is connected between high-power driving pipe Q1 source electrode and the ground, resistance R 8 is current sampling resistors, just can control the size of output current by the size that changes this resistance, resistance R 6 is connected between the high-power driving pipe Q1 grid source electrode, resistance R 6 is control chip AP3770 current sample current-limiting resistances, the grid of high-power driving pipe Q1 is connected with control chip AP3770 pin 1, resistance R 7 one ends are connected on the control chip AP3770 pin 4, the other end is connected on the node of resistance R 8 and high-power driving pipe Q1 source electrode, control chip AP3770 pin 2 ground connection.
Control chip AP3770 is the core of control section, is a frequency modulation(FM) chip (PFM)..Characteristics are: limit, source feedback (PSR) constant voltage/constant current (CV/CC) control; Utmost point low starting current: 0.2 μ A; Built-in soft start, overvoltage protection, short-circuit protection.
The operation principle of this driving power:
This driving power is a switch DC stabilized voltage power supply, is that a single-ended isolation of discontinuous mode instead swashs the AC-DC converter.
Operation principle is: during power tube Q1 saturation conduction, input voltage (direct voltage behind the rectifying and wave-filtering) Ui is added to the elementary winding Np of high frequency transformer T1, for just, secondary winding Ns diode D7 oppositely ends with the relative non-same polarity of " " name end, and high frequency transformer moves as inductance; When power tube Q1 turn-offed, each winding induced electromotive force " " end of high frequency transformer was negative, the conducting of secondary diode D7 positively biased, and the magnetic core magnetic flux can not suddenly change, and excitation magnetic potential is constant, satisfies i
2p/ i
1p=Np/Ns relation, as the transformer operation, the magnetic field energy that will store conduction period is transferred to load, and in whole load and input voltage range, secondary current drops to zero in deadline.If output capacitance C5 is enough big, output voltage U o is constant substantially in the time at charge and discharge.
This is a frequency modulation(FM) control chip (PFM), when input voltage changes or load variations (being that output current changes), can feed back to the chip respective input by sampling resistor, chip will change the flat rate of work, keeps the stable of output voltage, electric current.
Claims (2)
1. the LED driving power circuit of the AP3770 chip of a High Power Factor; it is characterized in that: this circuit comprises the interchange input protection circuit; rectification and circuit of power factor correction; the start power supply circuits; the drain electrode clamping protective circuit; driving power control chip power supply circuits; high frequency transformer; AP3770 power control circuit and LED lamp driving power source dc output circuit; exchange and export to rectification and circuit of power factor correction after input protection circuit inserts external electrical network 220V power supply; the interchange that rectification and circuit of power factor correction will be imported changes direct current into through bridge rectifier; and carry out exporting to the start power supply circuits after the power factor correction; the drain electrode clamping protective circuit; driving power control chip power supply circuits and high frequency transformer; the start power supply circuits are connected with control chip AP3770 in the AP3770 power control circuit; when start, give control chip AP3770 power supply; the output of driving power control chip power supply circuits is connected with control chip AP3770 in the AP3770 power control circuit; for providing galvanic current, control chip AP3770 operate as normal presses; the output of high frequency transformer is connected with the input of LED lamp driving power source dc output circuit, and the output of drain electrode clamping protective circuit is connected with the high-power driving pipe Q1 in the AP3770 power control circuit.
2. the LED driving power circuit of the AP3770 chip of High Power Factor according to claim 1, it is characterized in that: described AP3770 power control circuit comprises control chip AP3770, capacitor C 2, resistance R 4, R5, R6, R7, R8 and high-power driving pipe Q1, capacitor C 2 is connected between control chip AP3770 pin 5 and the ground, resistance R 4 is connected between the Na winding positive terminal of control chip AP3770 pin 6 and high frequency transformer, resistance R 5 is connected between control chip AP3770 pin 6 and the ground, resistance R 8 is connected between high-power driving pipe Q1 source electrode and the ground, resistance R 6 is connected between high-power driving pipe Q1 grid and the source electrode, the grid of high-power driving pipe Q1 is connected with control chip AP3770 pin 1, resistance R 7 one ends are connected on the control chip AP3770 pin 4, the other end is connected on the node of resistance R 8 and high-power driving pipe Q1 source electrode, control chip AP3770 pin 2 ground connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320120643 CN203136274U (en) | 2013-03-15 | 2013-03-15 | High-power-factor LED drive power supply circuit of AP3770 chip |
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| CN 201320120643 CN203136274U (en) | 2013-03-15 | 2013-03-15 | High-power-factor LED drive power supply circuit of AP3770 chip |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103944394A (en) * | 2014-03-26 | 2014-07-23 | 东莞市冠日光电科技有限公司 | LED switching power supply controller integrated circuit |
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2013
- 2013-03-15 CN CN 201320120643 patent/CN203136274U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103944394A (en) * | 2014-03-26 | 2014-07-23 | 东莞市冠日光电科技有限公司 | LED switching power supply controller integrated circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130814 Termination date: 20150315 |
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| EXPY | Termination of patent right or utility model |