CN201138888Y - Power supply for high-power lamp - Google Patents

Abstract

The utility model discloses a power for high-power lamp. The technical key points of the device are that the device comprises a direct-current voltage regulator, an electronic switching circuit, a segmentation cycle controller, an asymmetric pulse oscillator, an LC resonance circuit and a lamp abnormity detection circuit; the direct-current voltage regulator provides a direct-current power supply; the dividing circulation controller is connected with the electronic switch circuit and the asymmetric pulse oscillator, outputs PWM pulse signals to the asymmetric pulse oscillator, and controls output control signals to the asymmetric pulse oscillator through the electronic switch circuit so as to control the asymmetric pulse oscillator to oscillate; the asymmetric pulse oscillator is connected with the LC resonance circuit to enable the lamp tube to be ignited and to work normally; the LC resonance circuit is connected with the lamp abnormity detection circuit; the lamp abnormality detection circuit is connected to the divided cycle controller. The utility model aims at overcoming the defects of the prior art, providing a power supply for a high-power lamp, which has simple structure, only adopts a chip and has low cost.

Description

Power supply for high power lamps

【Technical field】

The utility model relates to a trigger and working power supply for high-power fluorescent lamps, discharge lamps and the like.

【Background technique】

At present, the electronic ballasts used in fluorescent lamps are equipped with a dedicated IC control chip, and the output power is limited by the IC control chip, so the fluorescent lamps cannot be made too large. Generally, the existing electronic ballasts can only Ignite fluorescent lamps with a voltage below 250 volts. At present, people's demand for high-power fluorescent lamps is getting higher and higher, so the high-power fluorescent lamps cannot be ignited with existing electronic ballasts. At present, there are power supplies for lighting high-power fluorescent lamps, but the circuit structure is relatively complicated, and a lot of chips are needed to control and complete the work, which increases the cost.

【Content of utility model】

The purpose of the utility model is to provide a high-power lamp power supply with simple structure, only one chip and low cost in order to overcome the deficiencies of the prior art.

In order to solve the above-mentioned technical problems, the utility model adopts the following technical solutions:

The power supply for high-power lamps is characterized in that it includes a DC voltage regulator that can rectify and boost the external AC power supply, an electronic switch circuit that acts as a switch, a split cycle controller, an asymmetrical pulse oscillator, an LC resonant circuit, Lamp anomaly detection circuit, DC voltage regulator, the output terminal of which is connected to electronic switching circuit, asymmetrical pulse oscillator, split cycle controller, LC resonant circuit and provides them with DC power;

The output end of the split cycle controller is connected with the electronic switch circuit and the asymmetric pulse oscillator, the split cycle controller outputs PWM pulse signal to the asymmetric pulse oscillator, and the split cycle controller controls the asymmetric pulse through the electronic switch circuit according to the power factor of the fluorescent lamp. The output control signal of the oscillator is used to control the asymmetrical pulse oscillator to oscillate;

The output end of the asymmetric pulse oscillator is connected to the LC resonant circuit; the asymmetric pulse oscillator converts the DC high voltage supplied by the DC voltage regulator through the electronic switch circuit into an AC high voltage, and outputs it to the LC resonant circuit to generate a high-frequency AC voltage. Add it to the high-power fluorescent lamp tube to make the tube ignite and work normally;

The output end of the LC resonant circuit is also connected with a lamp abnormality detection circuit, and the output end of the lamp abnormality detection circuit is connected with a division cycle controller. The command control electronic switch circuit is disconnected.

The above-mentioned power supply for high-power lamps is characterized in that: the divided cycle controller includes an integrated block, and the integrated block is L6585.

The power supply for high-power lamps as described above is characterized in that: the electronic switch circuit includes a MOS tube T1, the gate of the MOS tube is connected to the output terminal of the split cycle controller, and the source of the MOS tube is connected to the DC voltage regulator The output terminal is connected to the anode of the diode D10, the drain of the MOS transistor is grounded, and the cathode of the diode is connected to the asymmetrical pulse oscillator.

Compared with the prior art, the utility model has the following advantages: 1. The utility model has a simple structure because only one chip is used;

2. L6585 improves the brightness of the lamp, reduces power consumption at the same time, and complies with relevant power safety and power consumption regulations;

3. The characteristic of L6585IC is that it can independently program the preheating time and ignition time and the half-bridge frequency of each working stage; therefore, this single-chip IC can be used for many different types of lamps;

4. L6585IC implements high-safety protection for the PFC and half-bridge on the chip; in addition to limiting the voltage and current on the lamp during ignition and normal operation, the over-current protection function of L6585 can also prevent capacitive mode appear in the half-bridge section to further improve the reliability of the ballast;

5. L6585 also has many other advantages. For example, the overvoltage and feedback disconnection detection function of PFC can turn off the IC to prevent the ballast from being damaged; the high linearity multiplier enables the ballast to work under wide voltage power supply, At the same time the total harmonic distortion (THD) is very low.

【Description of drawings】

Fig. 1 is a block diagram of the utility model;

Fig. 2 is a circuit connection diagram of the utility model.

【Detailed ways】

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail:

As shown in Figure 1, the utility model includes a DC voltage regulator A, an electronic switch circuit B, a split cycle controller C, an asymmetrical pulse oscillator D, an LC resonant circuit E, and a lamp abnormality detection circuit F.

The DC voltage regulator A can rectify and boost the external AC power supply, and its output terminal is connected to the electronic switch circuit B, the asymmetrical pulse oscillator D, the split cycle controller C, and the LC resonant circuit E to provide DC power supply;

The output terminal of the split cycle controller C is connected to the electronic switch circuit B and the asymmetric pulse oscillator D, and the split cycle controller C outputs a PWM pulse signal to the asymmetric pulse oscillator D, and the electronic switch circuit B and the split cycle controller C internal The circuits together form a PFC active filter circuit. The split cycle controller C controls the on-off of the electronic switch circuit B according to the power factor of the fluorescent lamp. The output terminal of the electronic switch circuit B is connected to the asymmetrical pulse oscillator D to provide The D control signal determines whether it works, so as to control the asymmetrical pulse oscillator D to oscillate; make the DC voltage regulator A output to the asymmetrical pulse oscillator D input through the electronic switch circuit B. The DC high voltage is converted into an AC high voltage, and then It is output from the output terminal of the asymmetrical pulse oscillator D, and the output terminal of the asymmetrical pulse oscillator is connected to the LC resonant circuit; the asymmetrical pulse oscillator D oscillates to generate an AC voltage, and the AC voltage causes the LC resonant circuit E to resonate, generating a high-frequency AC The voltage is added to the high-power fluorescent lamp tube to make the tube ignite and work normally;

The output end of the LC resonant circuit E is also connected to the lamp abnormality detection circuit F; the output end of the lamp abnormality detection circuit F is connected to the division cycle controller C; The cycle controller C sends out a control command to disconnect the electronic switch circuit B, so that the DC voltage regulator A cannot supply power to the fluorescent lamp through the asymmetrical pulse oscillator D and the LC series resonant circuit E, so that the fluorescent lamp stops working.

A specific circuit structure is given below to further illustrate the utility model. As shown in FIG. 2 , the DC voltage regulator includes capacitors C1, C2, C3, transformer L1, four diodes D1, and the primary winding of transformer L2. Capacitors C1, C2, C3, and transformer L1 filter the external AC power; a bridge rectifier circuit composed of four diodes D1 rectifies the filtered AC into DC.

The electronic switch circuit B includes a MOS transistor T1 and a diode D10, the gate of the MOS transistor T1 is connected to the output terminal of the split cycle controller C, the source of the MOS transistor T1 is connected to the output terminal of the DC voltage regulator A and the anode of the diode D10, and the MOS transistor T1 is connected to the output terminal of the diode D10. The drain of T1 is grounded, and the cathode of diode D10 is connected with asymmetric pulse oscillator D.

The asymmetric pulse oscillator D includes the primary winding of transformer L3 and 4 secondary windings, MOS tubes T2, T21, T3, T31, fast recovery diodes D6, D61, D7, D71, and resistors R4, R41, R5, R51. Symmetric Pulse Oscillator.

The LC series resonant circuit E includes a primary winding of a transformer L4, an inductor L5, and capacitors C7, C8, and C9.

The lamp abnormality detection circuit F includes a secondary coil of a transformer L4, diodes D8, D9, a capacitor C10, and resistors R11, R12.

The core part of the divided cycle controller C is the integrated block U1, and the model of U1 is L6585. The L6585 integrates a power factor corrector (PFC) with a half-bridge controller and all related drivers and logic circuits in one chip. (PFC means "power factor", which is mainly used to represent the utilization efficiency of electric energy by electronic products. The higher the power factor, the higher the utilization efficiency of electric energy.)

The DC voltage regulator and the split loop controller together form a PFC active filter circuit to rectify and filter the AC power and output it to the electronic switch circuit B. The direct current (DC) output voltage of the PFC passes through the diode D10, and then passes through the series resistors R18 and R19 , The series resistor R20 and R1 divide the voltage and input it to pin 1.

Pin 10 of the L6585 is used for input lamp off detection and restart, a low voltage will reset the integrated block U1 and restart after a programmable time, pin 10 is connected to the secondary winding of the transformer L4.

Pin 18 of L6585 is connected to the gate of MOS tube T1 through resistor R3. The PFC circuit in L6585 and the DC voltage regulator together form a PFC active filter circuit. The operating frequency of the PFC active filter circuit depends entirely on the integrated block L6585. The best way to achieve a power factor value of PFC greater than or equal to 0.99 is to make the current waveform at the grid input end approach a sine wave and maintain the same phase as the input grid voltage.

R6 and C11 are the current starting elements of L6585, connected to pin 19 of L6585, and the other end of R6 is connected to an output end of bridge rectifier.

The secondary winding of transformer L2 and diode D3 are the power supply circuit of L6585, and the voltage applied to pin 19 of L6585 is 15V.

The PWM pulse output by pin 16 and pin 17 of L6585 (PWM is a method of digitally encoding the analog signal level; through the use of high-resolution counters, the duty cycle of the square wave is modulated to control a specific analog signal The level is coded.) Transformer L3 drives MOS tubes T2, T21, T3, T31 to generate alternating current of approximately sine wave; inductance L5 and capacitor C7 form an LC resonant circuit to generate high-frequency voltage, which is added to both ends of the lamp tube to make The lamp is ignited, and after being ignited, the series resonant winding L5 acts as a current limiter to make the lamp work under normal voltage. Its working principle is: invert the high-voltage direct current output by the direct-current voltage regulator into high-frequency alternating current and use it to ignite the bulb and make it work reliably. The working frequency is determined by the resonant frequency of L6585. Pin 16 and pin 17 of L6585 are connected to the primary of pulse transformer L3, and the same-name terminal of the secondary output of pulse transformer L3 ensures that MOS tubes T2 and T21, and MOS tubes T3 and T31 are turned on alternately. , Resistors R4, R41, R5, R51 are gate current limiting resistors of MOS transistors T2, T21, T3, T31, and fast recovery diodes D6, D61, D7, D71 are reverse leakage currents of MOS transistors T2, T21, T3, T31 Diode; inductance L5 is the current-limiting energy storage inductance of the lamp, capacitor C7 is a DC blocking capacitor, and pulse transformer L3 is an excitation pulse transformer for MOS transistors T2, T21, T3, and T31.

The utility model can be used for CFL (energy saving lamp is also called compact fluorescent lamp, referred to as CFL lamp) or T8, T4, T5, T12 and other straight tube fluorescent lamps, and is also suitable for direct current as a power supply or resistance heating, light source and the like.

Claims (3)

1, high-power lamp power, it is characterized in that: include the direct current voltage regulator (A) that extraneous AC power can be carried out rectification and boost, rise on-off action electronic switching circuit (B), cut apart cycle controller (C), asymmetry pulse oscillator (D), LC resonant circuit (E), lamp abnormal detection circuit (F), direct current voltage regulator (A), its output connect electronic switching circuit (B), asymmetry pulse oscillator (D), cut apart cycle controller (C), LC resonant circuit (E) and for they provide DC power supply;

Cut apart cycle controller (C) output and connect electronic switching circuit (B), asymmetry pulse oscillator (D), cut apart the output pwm pulse signal of cycle controller (C) to asymmetry pulse oscillator (D), cut apart cycle controller (C) and pass through the output control signal of electronic switching circuit (B) control, control asymmetry pulse oscillator (D) with this and vibrate to asymmetry pulse oscillator (D) according to the power factor of fluorescent lamp;

The output of asymmetry pulse oscillator (D) connects LC resonant circuit (E); Asymmetry pulse oscillator (D) is defeated by direct current voltage regulator (A) by electronic switching circuit (B) high direct voltage converts ac high-voltage to, export to LC resonant circuit (E), produce high-frequency ac voltage, be added to fluorescent tube is lighted and operate as normal;

LC resonant circuit (E) output also is connected with lamp abnormal detection circuit (F), lamp abnormal detection circuit (F) output connects cuts apart cycle controller (C), lamp abnormal detection circuit (F) detects the fluorescent lamp operation abnormal signal, offer and cut apart cycle controller (C), cut apart cycle controller (C) and make and send control command control electronic switching circuit (B) and disconnect.

2, high-power lamp power according to claim 1 is characterized in that: the described cycle controller (C) of cutting apart comprises integrated package (U1), and integrated package (U1) is L6585.

3, high-power lamp power according to claim 1, it is characterized in that: described electronic switching circuit (B) is for including metal-oxide-semiconductor (T1), metal-oxide-semiconductor (T1) grid with cut apart cycle controller (C) output and be connected, the source electrode of metal-oxide-semiconductor (T1) is connected with the positive pole of direct current voltage regulator (A) output and diode (D10), the grounded drain of metal-oxide-semiconductor (T1), the negative pole of diode (D10) is connected with asymmetry pulse oscillator (D).

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