CN2183067Y - Electronic ballast for high pressure sodium discharge lamp - Google Patents

Abstract

The utility model discloses an electronic ballast for high voltage sodium lamp, which is belongs to the technical field of electronic technologies. The system of the utility model adopts an independent excitation operation mode. The system of the utility model is composed of a pulse width modulation circuit, a power amplification circuit, an output LC series branch with the function of inductance switching over, a restarting circuit, an automatically regulating circuit of lamp power, a power supply and a casing. The power can be saved about 30%, the power factor is more than 0.95, the functions of the soft start, restart, automatic regulation of lamp power can be provided, and the service life of a sodium lamp can be prolonged.

Description

Electronic ballast for high pressure sodium discharge lamp

The utility model relates to a kind of energy-conservation electronic ballast of high voltage sodium lamp.

At present, the inductive high-voltage sodium lamp ballast is to make iron core with silicon steel sheet in metal shell, the choke that forms with the enamelled wire coiling.Ballast is connected in series with sodium vapor lamp, and head and the tail connect power line.Be the starter sodium vapor lamp, other joins starter, and it and sodium vapor lamp also connect.After powering up, starter produces the impulse train of fixed amplitude with the sodium vapor lamp starter; Behind the starter, lamp current increases, and after this by the ballast current limliting, keeps sodium lamp lighting.This ballast power consumption is big, luminous efficiency is low, power factor is low, consume many, the hard starter modes of copper material, lamp power is big with change in voltage.The purpose of this utility model provides a kind of electronic ballast of high voltage sodium lamp, and it not only combines starter and ballast together, and greatly improves power factor, saves energy is saved a large amount of copper materials, and soft starter is arranged, the function of lamp power stability can prolong the sodium vapor lamp life-span.

The way that realizes this purpose be one of design by pulse-width modulator (PWM), power amplifier, inductance value automatic switchover LC series arm, starting circuit again, lamp power auto-adjusting circuit, the electric ballast that current rectifying and wave filtering circuit and shell etc. are formed.Through test, owing to adopt such scheme, the utility model can economize on electricity 30%, and power factor can bring up to 0.95, when input voltage changes, and the lamp power stability, and have soft starter, starter function again, prolong the sodium vapor lamp life-span.Below in conjunction with description of drawings concrete structure of the present utility model and operation principle.

With reference to the accompanying drawings, accompanying drawing is circuit theory diagrams of the present utility model.Connecting relation between its each several part is: 6 pin of pulse-width modulator (PWM) IC2 are connected with R3, R4, C2 circuit, 4 pin are connected with the lamp power auto-adjusting circuit that D1, R1, R2 form, 12 pin are connected with 3 pin of IC3 in the starting circuit again, 8,11 2 pin are connected with the power amplifier that Q1, Q2 form with pulse transformer B2, B3, the drain electrode of Q1 is connected with D4 output in the current rectifying and wave filtering circuit in the power amplifier, and the Q2 source electrode connects high pressure ground.Inductance value automatic switchover LC series arm is by L1, L2, C11, C3, J(relay) form, one end and Q1, the Q2 tie point links to each other, the other end links to each other with C9, C10 tie point, the line bag one end ground connection of J, the other end is connected to 3 pin of IC3 through C3, and two lead-in wires of sodium vapor lamp are connected to C11 two ends.

Starting circuit is by the B4(current transformer again), the timing circuit formed of D2, C6, R7, Q3, IC3, R5, R6, C5, C4 forms, a lead-in wire that connects sodium vapor lamp passes the B4 magnet ring, 3 pin of IC3 are connected with 12 pin of IC2 and C3 anode.Current rectifying and wave filtering circuit has two groups, and one group of low-voltage dc power supply of being made up of transformer B1 and D3, C7, IC1, C8 uses for low-voltage circuit, and another group is used for power amplifier by the high-voltage DC power supply that D4, R8, C9, C10 form.

Its operation principle is such: after power supply closed a floodgate, rectifier D4 output dc voltage was through adding to after C9, the C10 filtering on Q1 drain electrode and the Q2 source electrode.Supply voltage is divided into two-way through transformer B1 step-down, D3 rectification, C7 filtering, and one the tunnel is used for the power supply of lamp power auto-adjusting circuit; Use for low-voltage circuit after three terminal regulator IC1 voltage stabilizing on another road.Power up initial, 2,6 pin of IC3 are low level, output 3 pin are high level, and its output adds to relay line bag, relay adhesive through C3, normally-closed contact J1-1 disconnects, L2 does not incorporate branch road into, for starter is prepared, makes the PWM starting oscillation simultaneously, because the charging effect of C2 in pulse-width modulator (PWM) circuit, its frequency of oscillation has a change procedure from high to low.The output of pulse-width modulator (PWM) makes Q1, Q2 be on off state through the G-S utmost point that pulse transformer B2, B3 are added to Q1, Q2 respectively.When the frequency of oscillation of pulse-width modulator (PWM) by high step-down, near L1, during the series resonance frequency of C11, the high frequency voltage of capacitor C 11 increases rapidly, when reaching the sodium vapor lamp starting voltage, sodium vapor lamp is starter immediately, and the C3 charging current reduces subsequently, and relay discharges, the normally-closed contact closure, L2 is in parallel with L1, because L2＜＜L1, the sodium vapor lamp electric current increases, and enter normal illumination, thereafter, lamp current detects by current transformer B4, and secondary induction voltage is through the D2 rectification, C6 filtering, be added to triode Q3 ground level through current-limiting resistance, the Q3 conducting, 7 pin of IC3 are low level, 2,6 pin also keep low level, output keeps high level constant, and sodium vapor lamp continues illumination.When input voltage fluctuation is too big, sodium vapor lamp extinguishes automatically, current transformer detects less than electric current, Q3 ends, power supply charges to C5 by resistance, when the voltage on the C5 surpasses 2/3 supply voltage, output becomes low level, pulse-width modulator (PWM) quits work, and this moment, 7 pin of IC3 were low level, and C5 discharges by R6, when the voltage of C5 drops to 1/3 supply voltage, output is again a high level, the actuating of relay, and pulse-width modulator (PWM) is started working and is repeated above-mentioned starter process.Lamp power auto-adjusting circuit, from the signal of low-voltage rectifier D3 output acquisition change in voltage, through being added to after D1, R1, the R2 dividing potential drop on the pulse-width modulator (PWM), when voltage raises, the pulse duration of pulse-width modulator (PWM) output narrows down, and makes the lamp power stability.

Claims (2)

1, a kind of electronic ballast of high voltage sodium lamp, in metal shell, form by bridge rectifier, inverter circuit, it is characterized in that: by a resistance and an electric capacity parallel connection, the variable-frequency scanning control circuit of connecting with a resistance again, the R of a termination pulse-width modulator _TEnd, other end ground connection; Make the relay that inductance value automaticallyes switch, its normally-closed contact respectively with inductance L ₁, L ₂An end link to each other, both cooperate starter and the illumination that realizes sodium vapor lamp; A lead that connects sodium vapor lamp passes the current transformer magnet ring, and secondary output is electrically connected with rectifier diode, filter capacitor, triode, timer; Its output reaches with the power end of pulse-width modulator respectively and is electrically connected with relay line bag by electric capacity, in the lamp power auto-adjusting circuit, the pulse width modulation end of pulse-width modulator is electrically connected with the lower pressure rectifier circuit output end through resistance, voltage stabilizing didoe.

2, electronic ballast of high voltage sodium lamp according to claim 1 is characterized in that: inductance L in the series resonance branch road ₁, L ₂Be connected in series, two statures of relay normally-closed contact are connected on inductance L respectively ₁Two ends.

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