CN201750602U

CN201750602U - Drive power source of LED daylight lamp

Info

Publication number: CN201750602U
Application number: CN2010202814571U
Authority: CN
Inventors: 苏杰
Original assignee: NINGBO OUSHANG LIGHTING CO Ltd
Current assignee: NINGBO OUSHANG LIGHTING CO Ltd
Priority date: 2010-08-04
Filing date: 2010-08-04
Publication date: 2011-02-16
Anticipated expiration: 2020-08-04

Abstract

The utility model relates to a drive power source of an LED daylight lamp, comprising a rectification filter circuit, a constant-current control management circuit, a boosted filter circuit, a main control chip and a starting power supply circuit; the main control chip comprises eight pins, wherein 1# pin and 2# pin are connected with a feedback compensation circuit, 3# pin is connected with a harmonic frequency control circuit, 4# pin is connected with a current sampling protection circuit, 5# pin is connected with a transformer current over-zero detecting circuit, 6# pin is grounded, and 7# pin and 8# pin are respectively connected with a switch drive circuit and the starting power supply circuit. The drive power source of an LED daylight lamp has the following advantages: a PFC chip is adopted to be combined with CCR; the efficiency of the entire route design is larger than or equal to 90%; the PF value is larger than or equal to 0.95 in full voltage range; THD is less than or equal to 10; the drive power source has small starting current, low cost and high efficiency; the power source system has light weight, good stability and high reliability; and the circuit is directly integrated with the lamp plate so as to be convenient for installation and change.

Description

The LED fluorescent lamp driving power supply

Technical field

The utility model relates to the LED field, relates in particular to a kind of LED fluorescent lamp driving power supply.

Background technology

Daylight lamp power source in the market is to adopt step-down Buck scheme substantially, PFC (Active PFC) with passive by ripple rectification (valley fill type) circuit, harmonic distortion is big, the material of constant current value and LED lamp housing is relevant, the loop instability of electric current and voltage, easily produce stroboscopic, circuit complexity and number of electronic components are more, to producing and processing technology requirement height.

The utility model content

The purpose of this utility model provides a kind of LED fluorescent lamp driving power supply, solved that existing product harmonic distortion is big, the loop of electric current and voltage is unstable and easily produced the problem of stroboscopic.

The purpose of this utility model is to be achieved through the following technical solutions: a kind of LED fluorescent lamp driving power supply; comprise current rectifying and wave filtering circuit; constant current control and management circuit; filter circuit boosts; main control chip and startup power supply circuits; described main control chip comprises 8 pins; wherein No. 1 pin is connected the feedback compensation circuit with No. 2 pins; be provided with chip ceramic capacitor C5 between No. 2 pins of main control chip and the feedback compensation circuit; No. 3 pin connects the harmonic frequency control circuit; No. 4 pin connects the current sampling protective circuit; No. 5 pin connects the transformer current zero cross detection circuit; No. 6 pin ground connection, No. 7 pin is connected switch driving circuit respectively and starts power supply circuits with No. 8 pins.

Described current rectifying and wave filtering circuit connects power conversion circuit by circuit, current rectifying and wave filtering circuit comprises bridge rectifier and the mylar capacitor C 2 that 4 diode D1-D4 constitute, diode D1 is connected the live wire L of alternating current with D2, diode D3 and D4 are connected the zero line N of alternating current by fuse FR; The end of described capacitor C 2 and diode D1 is connected high voltage HV, the other end ground connection of capacitor C 2.

Described power conversion circuit comprises high frequency transformer T1 and field effect transistor M1, the secondary winding of high frequency transformer T1 is by No. 5 pins of transformer current zero cross detection circuit connection main control chip, and the output of high frequency transformer T1 connects the input of the filter circuit that boosts; The grid of field effect transistor M1 connects switch driving circuit, and the drain electrode of field effect transistor M1 connects the input of the filter circuit that boosts, and the source electrode of field effect transistor M1 connects the current sampling protective circuit.

Described constant current control and management circuit comprises total output OUT, and the end ground connection of total output OUT and the other end connect the output of the filter circuit that boosts by current regulator diode D9.

The described filter circuit that boosts comprises electrochemical capacitor E1 and diode D5, and the end of electrochemical capacitor E1 is connected the feedback compensation circuit with the end of diode D5, and the other end of diode D5 is crossed the connection power conversion circuit.

Described startup power supply circuits comprise diode D8 and voltage stabilizing didoe D6, the end of described diode D8 is connected power conversion circuit and transformer current zero cross detection circuit with the end of voltage stabilizing didoe D6 by chip ceramic capacitor C4 with resistance R 13, the other end ground connection of voltage stabilizing didoe D6, the other end of diode D8 is connected high voltage HV by resistance R 3 with R2, the other end of diode D8 connects No. 8 pins of main control chip and passes through capacitor C 3 ground connection.

The beneficial effects of the utility model are: adopt PFC (Active PFC) chip to combine with CCR (constant current managing chip), the efficient of whole line design 〉=90%, the PF value under full voltage range 〉=0.95, THD (total harmonic distortion)≤10; Starting current is little, and peripheral component is few, and is with low cost, high efficiency, low EMI; Can satisfy the T12/T8/T5LED fluorescent lamp simultaneously; Power-supply system is in light weight, good stability, reliability height; Direct and the lamp plate composition one of circuit is convenient to install and is changed.

Description of drawings

With reference to the accompanying drawings the utility model is described in further detail below.

Fig. 1 is the circuit diagram of LED fluorescent lamp driving power supply described in the utility model.

Among the figure: 1, current rectifying and wave filtering circuit; 2, power conversion circuit; 3, constant current control and management circuit; 4, the filter circuit that boosts; 5, feedback compensation circuit; 6, harmonic frequency control circuit; 7, main control chip; 8, current sampling protective circuit; 9, switch driving circuit; 10, start power supply circuits; 11, transformer current zero cross detection circuit.

Embodiment

As shown in Figure 1; the described a kind of LED fluorescent lamp driving power supply of the utility model embodiment; comprise current rectifying and wave filtering circuit 1; constant current control and management circuit 3; filter circuit 4 boosts; main control chip 7 and startup power supply circuits 10; described main control chip 7 comprises 8 pins; wherein No. 1 pin is connected feedback compensation circuit 5 with No. 2 pins; be provided with chip ceramic capacitor C5 between No. 2 pins of main control chip 7 and the feedback compensation circuit 5; No. 3 pin connects harmonic frequency control circuit 6; No. 4 pin connects current sampling protective circuit 8; No. 5 pin connects transformer current zero cross detection circuit 11; No. 6 pin ground connection, No. 7 pin is connected switch driving circuit 9 respectively and starts power supply circuits 10 with No. 8 pins.

Described current rectifying and wave filtering circuit 1 connects power conversion circuit 2 by circuit, current rectifying and wave filtering circuit 1 comprises bridge rectifier and the mylar capacitor C 2 that 4 diode D1-D4 constitute, diode D1 is connected the live wire L of alternating current with D2, diode D3 and D4 are connected the zero line N of alternating current by fuse FR; The end of described capacitor C 2 and diode D1 is connected high voltage HV, the other end ground connection of capacitor C 2.

Described power conversion circuit 2 comprises high frequency transformer T1 and field effect transistor M1, the secondary winding of high frequency transformer T1 is by No. 5 pins of transformer current zero cross detection circuit 11 connection main control chips 7, and the output of high frequency transformer T1 connects the input of the filter circuit 4 that boosts; The grid of field effect transistor M1 connects switch driving circuit 9, and the drain electrode of field effect transistor M1 connects the input of the filter circuit 4 that boosts, and the source electrode of field effect transistor M1 connects current sampling protective circuit 8.

Described constant current control and management circuit 3 comprises total output OUT, and the end ground connection of total output OUT and the other end connect the output of the filter circuit 4 that boosts by current regulator diode D9.

The described filter circuit 4 that boosts comprises electrochemical capacitor E1 and diode D5, and the end of electrochemical capacitor E1 is connected feedback compensation circuit 5 with the end of diode D5, and the other end of diode D5 is crossed connection power conversion circuit 2.

Described startup power supply circuits 10 comprise diode D8 and voltage stabilizing didoe D6, the end of described diode D8 is connected power conversion circuit 2 and transformer current zero cross detection circuit 11 with the end of voltage stabilizing didoe D6 by chip ceramic capacitor C4 with resistance R 13, the other end ground connection of voltage stabilizing didoe D6, the other end of diode D8 is connected high voltage HV by resistance R 3 with R2, the other end of diode D8 connects No. 8 pins of main control chip 7 and passes through capacitor C 3 ground connection.

Remaining circuit is a custom circuit, so do not give unnecessary details at this.

Direct and the lamp plate composition one of the circuit of the described a kind of LED fluorescent lamp driving power supply of the utility model embodiment, be convenient to install and change, it is applicable to that supply voltage is the application scenario of 85V～265V T12/T8/T5 LED fluorescent lamp, particularly the voltage occasion of univoltage 110V or 230V can improve the efficient of power supply and the whole light efficiency of product.

When described LED fluorescent lamp driving power supply is specifically worked, alternating current is transformed to pulsating direct current through current rectifying and wave filtering circuit 1, the high-frequency signal of filtering simultaneously, reduce input current harmonics content, the input of circuit as a whole, the operating state of power conversion circuit 2 is decided by main control chip 7, its output is as the input of the filter circuit 4 that boosts, the filter circuit 4 that boosts is the boostrap circuit that boosts, its output is as the input of constant current control and management circuit 3, the constant electric current of constant current control and management circuit 3 is 15 milliamperes-90 milliamperes (according to the LED quantity and the electric currents of different T12/T8/T5 fluorescent tubes), feedback compensation circuit 5 is as the output voltage setting of the filter circuit 4 that boosts and the negative feedback network of output voltage, capacitor C 5 is compensating networks of Voltage loop, the resistance pressure-dividing network of harmonic frequency control circuit 6 is waveform and phase places of determining input voltage, oscillator by main control chip 7 inside decides, reduce THD, the secondary winding of T1 in the power conversion circuit 2, the current zero-crossing signal of T1 is delivered to No. 5 pins of main control chip 7 by transformer current zero cross detection circuit 11, start power supply circuits 10 simultaneously and supply with as the power supply when main control chip 7 starts with operate as normal, switch driving circuit 9 is the heavy source signals of the driving of M1 in the power conversion circuit 2; Current sampling protective circuit 8 is power protecting circuits of entire circuit, and the resistance R 1 in the current sampling protective circuit 8 is connected to No. 4 pins of main control chip 7 simultaneously as the current sense resistor of T1 through RC network; Whole circuit is the unsettled voltage of input to be become galvanic current press supply output, by the constant electric current output of current regulator diode control, the output that total output OUT of constant current control and management circuit 3 is entire circuit directly connects the LED fluorescent tube.

Claims

1. LED fluorescent lamp driving power supply; comprise current rectifying and wave filtering circuit (1); constant current control and management circuit (3); filter circuit (4) boosts; main control chip (7) and startup power supply circuits (10); it is characterized in that: described main control chip (7) comprises 8 pins; wherein No. 1 pin is connected feedback compensation circuit (5) with No. 2 pins; No. 3 pin connects harmonic frequency control circuit (6); No. 4 pin connects current sampling protective circuit (8); No. 5 pin connects transformer current zero cross detection circuit (11); No. 6 pin ground connection, No. 7 pin is connected switch driving circuit (9) respectively and starts power supply circuits (10) with No. 8 pins.

2. LED fluorescent lamp driving power supply according to claim 1 is characterized in that: be provided with chip ceramic capacitor C5 between No. 2 pins of described main control chip (7) and the feedback compensation circuit (5).

3. LED fluorescent lamp driving power supply according to claim 1 and 2, it is characterized in that: described current rectifying and wave filtering circuit (1) connects power conversion circuit (2) by circuit, and current rectifying and wave filtering circuit (1) comprises bridge rectifier and the mylar capacitor C 2 that 4 diode D1-D4 constitute; The end of described capacitor C 2 and diode D1 is connected high voltage HV, the other end ground connection of capacitor C 2.

4. LED fluorescent lamp driving power supply according to claim 3 is characterized in that: described diode D1 is connected the live wire L of alternating current with D2, and diode D3 and D4 are connected the zero line N of alternating current by fuse FR.

5. LED fluorescent lamp driving power supply according to claim 4, it is characterized in that: described power conversion circuit (2) comprises high frequency transformer T1 and field effect transistor M1, the secondary winding of high frequency transformer T1 is by No. 5 pins of transformer current zero cross detection circuit (11) connection main control chip (7), and the output of high frequency transformer T1 connects the input of filter circuit (4) of boosting; The grid of field effect transistor M1 connects switch driving circuit (9), and the drain electrode of field effect transistor M1 connects the input of filter circuit (4) of boosting, and the source electrode of field effect transistor M1 connects current sampling protective circuit (8).

6. LED fluorescent lamp driving power supply according to claim 4, it is characterized in that: described constant current control and management circuit (3) comprises total output OUT, and the end ground connection of total output OUT and the other end connect the output of filter circuit (4) of boosting by current regulator diode D9.

7. LED fluorescent lamp driving power supply according to claim 4, it is characterized in that: the described filter circuit that boosts (4) comprises electrochemical capacitor E1 and diode D5, the end of electrochemical capacitor E1 is connected feedback compensation circuit (5) with the end of diode D5, and the other end of diode D5 is crossed connection power conversion circuit (2).

8. LED fluorescent lamp driving power supply according to claim 4, it is characterized in that: described startup power supply circuits (10) comprise diode D8 and voltage stabilizing didoe D6, the end of described diode D8 is connected power conversion circuit (2) and transformer current zero cross detection circuit (11) with the end of voltage stabilizing didoe D6 by chip ceramic capacitor C4 with resistance R 13, the other end ground connection of voltage stabilizing didoe D6, the other end of diode D8 is connected high voltage HV by resistance R 3 with R2, the other end of diode D8 connects No. 8 pins of main control chip (7) and passes through capacitor C 3 ground connection.