CN2572713Y - Electronic ballast for high-pressure sodium lamp - Google Patents

Abstract

The utility model discloses an electronic ballast for a high-pressure sodium lamp relating to an electric lighting technique, which belongs to an electric electronic circuit device. The utility model transforms power frequently mains supply to direct current and high frequency alternating current so as to be used for the normal start and stable work of the high-pressure sodium lamp HPS and replace an inductive ballast. A semi-section balanced K type low-pass filter is connected in series after the mains supply; a ballast inductance coil is connected behind a half-bridge current changer, an auxiliary inductance coil is connected between the half-bridge current changer and the ballast inductance coil and is provided with an original secondary coil and a magnetic core structure, wherein, the secondary coil is connected between the half-bridge current changer and the ballast inductance coil; low voltage pulse generated on the original edge of auxiliary inductance and high voltage pulse inducted on the secondary edge of the auxiliary inductance are formed when resistance-capacitance charge causes a bidirectional diode to conduct so as to conduct controlled silicon; both ends of the lamp HPSL are connected in parallel with a voltage sample circuit mainly composed of coils; an input voltage sample circuit of a resistance voltage division type is connected behind an anode of a rectification circuit.

Description

A kind of electronic ballast of high voltage sodium lamp

Technical field

A kind of electronic ballast of high voltage sodium lamp of the utility model relates to and the electric lighting technology, concrete is to belong to a kind of Power Electronic Circuit device, promptly use element and semiconductor device such as resistance, electric capacity and inductance, the power frequency civil power is transformed into the alternating current of direct current and upper frequency, to be used for the normal startup and the steady operation of discharge lamp

Background technology

High-pressure sodium lamp (HPSL) is a kind of lamp most effective in the near-white light source, also is most economical lamp kind in floodlighting, and small light also is used on the indoor of some occasion or half room lighting.HPSL belongs to the discharge lamp classification but more segments is to belong to high-intensity gas discharge lamp, in it lights a lamp the loop, is ballast for making discharge stability all be added with the peculiar negative characteristic resistance of arc discharge.(foregoing is seen " illumination handbook, Japan's illumination can be edited in 1978, China Construction Industry Press's in September, 1985 publication) Chinese utility model 94228816 discloses a kind of HPSL electric ballast, and it comprises that general common rectification, filtering, feedback transformer formula half-bridge high-frequency generator is parts such as half-bridge converter; Also seal in an inductance L in addition in the ac input end increase, like this with rectifier bridge after two divide voltage-type filter capacitor C1, C2 equally and form LC series resonance power factor and promote circuit; Also designed a high-voltage pulse generation and triggered automatic control circuit, the RC charging circuit of two groups of parallel connections has promptly been arranged behind rectifier bridge.When start, wherein voltage reaches 30V and makes diac D10 conducting, voltage be added in the G utmost point of SCR again when above and make its conducting on one group the capacitor C 5; The voltage of another capacitor C 4 is the former limit winding L 5 by high frequency ballast transformer B2 thereupon then, also is that power cathode carries out pulsed discharge through SCR to the negative pole of C4 again, so also responds to generation 4KV high pressure to light HPSL on the secondary winding L 4 of B1.After the ignition, the former limit winding L 3 of feedback transformer B1 flows next electric current with regard to having from positive source and by resistance R 3, and therefore makes secondary L1, L2 have induced voltage to produce T1, the work of T2 alternate conduction of also therefore making.But since with charging capacitor C5 be the D9 that is connected of forward when the T2 conducting also forward conduction, C5 goes up and just can not set up the voltage that can make the diac conducting again like this, SCR is for closing, the secondary L4 of B2 does not have high-voltage pulse generation only plaing ballast effect again.Above-mentioned utility model weak point is not design any protective circuit; Flow through in addition to have in the electric current of HPSL from resistance R 3 and come, this just has the shortcoming of the power consumption gain of heat.

Summary of the invention

In view of this, the utility model proposes a kind of HPSL electric ballast, its technical problem that will solve is to set up protective circuit.Technical solutions of the utility model are as follows.First technical measures are to make high-voltage pulse generation usefulness without the ballast inductance coil, but seal in an auxiliary induction of setting up and former secondary and core structure are arranged before it, and the secondary coil inductance value is 1 to 2 times of ballast coil inductance value.Secondary coil is connected between half-bridge converter and the ballast inductance coil; The secondary two ends connect again respectively on the movable contact spring of a relay and normally opened contact on, be used for not being connected into short circuit but open-circuit condition in the secondary two ends when connecting, and the secondary two ends are connected into short circuit by lead, movable contact spring and normally-closed contact when relay work movable contact spring and normally opened contact connection by lead, movable contact spring and normally-closed contact when do not work movable contact spring and normally-closed contact of relay.This secondary is except that still can be used as high-voltage pulse takes place, big output impedance element especially concerning the half-bridge converter.So-called impulse circuit is that dc power anode is connected to the circuit of power cathode on the former limit of former limit, controllable silicon and normally-closed contact, movable contact spring and the coil by the auxiliary induction coil in regular turn, be used for when capacitance-resistance charging makes bidirectional diode conducting so that controllable silicon conducting, being formed in producing on action of low-voltage pulse so that the secondary on the former limit of auxiliary induction and induce high-voltage pulse at auxiliary induction, and when above-mentioned secondary is connected into short-circuit condition, DC power supply disconnects between normally-closed contact and movable contact spring, and action of low-voltage pulse is ended so that high-voltage pulse is also ended.Second technical measures are by the HPSL both end voltage is taken a sample, and there is the transistor circuit of relay J coil to come the control relay contact to close or open to make auxiliary induction to connect or by short circuit by one-level Y1 amplifier comparison circuit and collector electrode, while also makes high-voltage pulse take place accordingly or withdraws from, and the output impedance of half-bridge converter increases or transfers to normal.Enough big and make amplifier output high level so that J work make movable contact spring inhale to normally opened contact when duty sample voltage from normally-closed contact by charging and discharging circuit, and make the secondary coil two ends of auxiliary induction be connected into short circuit, high-frequency electrical is added on the lamp HPSL by ballast coil.The 3rd technical measures are need set up at the rectifier bridge anode to connect a sampling amplifier comparison circuit Y2 again, and be connected with aforementioned Y1 circuit as input stage circuit, as another input signal source, sampled signal is imported this amplifier negative terminal, and this amplifier output signal is input to the anode of that amplifier after the aforementioned lamps by the diode that oppositely connects.Make that it is normally closed to keep relay, and auxiliary induction is inserted when exchanging input and surpass 235V, the generation of high-power output when avoiding high voltage.The 4th technical measures are or not inductance of simple series connection at ac input end, but insert a half-section balance K type low pass filter, connect rectification circuit thereafter again.This filter iron core has a uniform section, and keeps certain inductance value under rated operational current.Contrast above-mentioned openly utility model patent; no matter the utility model is in use when start, under the situations such as open circuit, short circuit or high voltage input; access because of auxiliary induction; complete machine all is in low-duty and is protected; through actual measurement; be that complete machine power is between 20W-40W under the situation of 2 times of ballast coil inductance values and after becoming to stablizing at the auxiliary electrical sensibility reciprocal.Equally, because the access of low pass filter, impulse current and external high voltagehigh frequency impulse disturbances when also having weakened start, and protected electric ballast; Also having weakened electric ballast itself produces high-frequency current power supply has been protected in the pollution of civil power.

Description of drawings

Fig. 1 is the block diagram of the integrated circuit structure of a kind of electronic ballast of high voltage sodium lamp of the utility model.

Fig. 2 is the electrical schematic diagram of the integrated circuit structure of a kind of electronic ballast of high voltage sodium lamp of the utility model.

Embodiment

From Fig. 1 and Fig. 2, the mains electricity input end is connected with the half-section balance K type low pass filter of C11, L1-1 and L1-2 composition.Under lamp 150W, 0.9A condition, inductance value is 20-25MH; And under lamp 250W, 1.5A condition, be 15MH.Reach under certain sectional area condition at iron core, can play start current limliting protecting against shock and use; But also anti-current instantaneous interference pulse in addition is as the situation of 50ns, 2.5KV; Also can prevent this machine high-frequency electrical pollution mains supply; Raising to the complete machine power factor has compensating action.After above-mentioned filter, be connected with the diode bridge rectifier of forming by D1 one D4, and form filter circuit, supply with back level complete machine DC power supply with C31 and C32.This filter capacitor can obtain 20% energy-saving effect, so also can be considered power factor compensation circuit as long as capacity is enough big.After start, the mainly half-bridge converter work of forming with VD1 and VD2, it is L3-2, L3-3 and L3-1 that three groups of feedback inductance coils on same magnetic core are arranged in its LC oscillating circuit.During start work just, high-frequency electrical → L3-1 → C71 → L41 secondary coil → L5 → lamp HPSL → power cathode; At this moment, lamp begins bright, but because the auxiliary induction that the L41 conduct is set up, its secondary inductance amount is 1 to 2 times of ballast coil L5, so complete machine is the small-power state, lamp also is abnormal little bright state.Simultaneously, being related to high frequency ballast startup high-voltage generator circuit starts working, DC power supply → R71 → R72 → R73//C73 assembly → normally closed the former limit → dc power cathode of JA → movable contact spring → B, can make bidirectional diode VD3 conducting when C73 goes up when charging voltage reaches certain value this moment, electric current is through the former limit → power cathode of R71 → R72 → VD3 → R74 → JA → movable contact spring → B, make controllable silicon VD4 conducting simultaneously, be that electric current is through former → power cathode of R71 → L42 → VD4 → JA → movable contact spring → B, can on L41, respond to also 3KV pulse voltage like this, and be added on the lamp, to light bulb.Because be parallel with R81 and L6 coil series connection part takes a sample at lamp HPSL two ends, when last fast complete machine is in the small-power state, the last high-frequency electrical of L6 is passed through R82 after the D8 rectification, R2 and R1 charge to C1, C1 goes up and charges when reaching certain standard voltage value after 1-3 minute, amplifier Y1 exports high level, be added on the VD5 by R5, the VD5 conducting, this moment from the high-frequency electrical of B secondary through D6, after the D7 rectification, have one the tunnel behind R4, to make reference voltage in its direct current by DW2 clamper supply Y2 anode, again through R6, the sampling of R3 dividing potential drop is made reference voltage for the Y1 negative terminal, in addition except that to C3 charging and drive electric fan 8., can drive relay J, movable contact spring is drawn onto from normally closed JA point disengagement often opens the JB point, therefore disconnect of the conducting of VD4 electric current, and L41 is by the lead short circuit power cathode, therefore to lamp, complete machine is high-power state normal operating conditions when being in the aforementioned small-power state of contrast to high-frequency electrical from C71-movable contact spring-JB-L5.Can be described as warm-up phase before this stage.At this; if the lamp short-circuit condition takes place when being short-circuit condition or operate as normal in lamp, output shorted to earth state even, then the frequency of high-frequency electrical obviously reduces; cause L6 coil no-output; even the last no charging potential of C10 or had normal voltage also can discharge rapidly by D9 and R2 originally causes Y1 end of the same name to be input as 0, VD5 ends; the J former normally closed some JA that do not work and movable contact spring rebounds; L41 taps into, and complete machine is in the small-power state, and has protected the half-bridge converter.Equally, when lamp was open circuit, the high-frequency electrical output duty cycle was little, and the effective output voltage of L6 is lower, and Y1 is input as 0, and complete machine is in guard mode.Consider that civil power input may surpass the 235V situation, can pick out the input voltage sampling of D10 and R7, R8 dividing potential drop at D1-D4 bridge rectifier output cathode end again, adjusting R7, to make 235V be bridge balance, i.e. Y2 rectification of name end, negative name end are imported idiostatic.When the mains input voltage was higher than 235V, the negative name end of Y2 had been for just, the Y2 output low level, and D11 conducting so that Y1 are output as low level, and J is an off position, and complete machine is the small-power state; And when input was lower than 235V, Y2 exported high level, not conducting of D11, and the Y1 state is constant.

Claims (1)

1, a kind of electronic ballast of high voltage sodium lamp, include and insert inductance element of series connection inserts again behind the civil power rectification and filter circuit to produce DC power supply, be connected to feedback transformer formula half-bridge converter and connect the ballast inductance coil, so that the generation high-frequency electrical flows to lamp HPSL with as luminous energy by the ballast inductance coil it on thereafter; Also have high-voltage pulse generation and trigger automatic control circuit, it is characterized in that in order to high-voltage pulse be added on the lamp HPSL and light it:

(1) inductance element of connecting behind the described access civil power is a half-section balance K type low pass filter;

(2) also be connected with an auxiliary induction coil between the coil of connection ballast inductance behind the described half-bridge converter, it has former secondary coil and core structure, and secondary coil is connected between half-bridge converter and the ballast inductance coil; The secondary two ends connect again respectively on the movable contact spring of a relay and normally opened contact on, be used for not being connected into short circuit but open-circuit condition in the secondary two ends when connecting, and the secondary two ends are connected into short circuit by lead, movable contact spring and normally-closed contact when relay work movable contact spring and normally opened contact connection by lead, movable contact spring and normally-closed contact when do not work movable contact spring and normally-closed contact of relay;

(3) described high-voltage pulse generation and triggering automatic control circuit are the former limit that dc power anode passes through the auxiliary induction coil in regular turn, controllable silicon, and normally-closed contact, the former limit of a movable contact spring and a coil is connected to the circuit of power cathode, be used for when capacitance-resistance charging makes bidirectional diode conducting so that controllable silicon conducting, being formed in producing on action of low-voltage pulse so that the secondary on the former limit of auxiliary induction and induce high-voltage pulse at auxiliary induction, and when above-mentioned secondary is connected into short-circuit condition, DC power supply also disconnects between normally-closed contact and movable contact spring simultaneously, and action of low-voltage pulse is ended so that high-voltage pulse is also ended;

(4) described lamp HPSL two ends also be parallel with the voltage sample circuit that mainly constitutes by coil and with this sampling voltage signal controlling after grade one-level amplifier and collector electrode triode operating circuit that above-mentioned relay coil is arranged, be used for enough making amplifier output high level so that J work make movable contact spring inhale to normally opened contact greatly and by charging and discharging circuit from normally-closed contact when sampling voltage, and the secondary coil two ends that make auxiliary induction are connected into short circuit, and high-frequency electrical is added on the lamp HPSL by ballast coil;

(5) input voltage that also is connected with an electric resistance partial pressure type behind described rectification circuit anode is taken a sample, sampled signal is imported this amplifier negative terminal, and this amplifier output signal is input to the anode of that amplifier after the aforementioned lamps by the diode that oppositely connects, be used for when civil power surpasses 235V, also output low level of that amplifier behind this amplifier output low level so that the lamp, relay is thrown off, auxiliary induction inserts so that complete machine small-power state, otherwise this amplifier is exported positive level that amplifier is inoperative after to lamp maintains the original state because of diode reverse when civil power is lower than 235V.