CN2737114Y - Electronic ballast - Google Patents

Electronic ballast Download PDF

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Publication number
CN2737114Y
CN2737114Y CN 200420070701 CN200420070701U CN2737114Y CN 2737114 Y CN2737114 Y CN 2737114Y CN 200420070701 CN200420070701 CN 200420070701 CN 200420070701 U CN200420070701 U CN 200420070701U CN 2737114 Y CN2737114 Y CN 2737114Y
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CN
China
Prior art keywords
circuit
capacitor
diode
resistance
thyristor
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Expired - Fee Related
Application number
CN 200420070701
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Chinese (zh)
Inventor
马守本
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Individual
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Individual
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Priority to CN 200420070701 priority Critical patent/CN2737114Y/en
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Publication of CN2737114Y publication Critical patent/CN2737114Y/en
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Expired - Fee Related legal-status Critical Current

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Abstract

The utility model relates to an electronic ballast, comprising a housing fraction and a circuit fraction. The circuit fraction comprises an antijamming circuit, a rectifying filter circuit, and a half-bridge inverting circuit. The essential technique is that the electronic ballast is additionally provided with a time-delay starting circuit of all reset. The time-delay starting circuit of the all reset comprises resistors R<1>, R<2>, and R<3>, capacitors C<4> and C<6>, diodes D<2> and D<4> and a thyristor VS. After resistors R<1> and R<2> and the capacitor C<6> are connected in series, the resistor R<1> is connected with the (4) pin of a bridge rectifier D<Z>, and the capacitor C<6> is earthed; the positive electrode of the diode D<2> is connected with a (P) point on the connecting line of the resistor R<2> and the capacitor C<6>; the negative electrode of the diode D<2> is connected with one end of the resistor R<3>, the positive electrode of the capacitor C<4>, and the anode of the thyristor VS, and the other end of the resistor R<3> is earthed. The negative electrode of the capacitor C<4> is earthed, and the cathode of the thyristor VS is earthed; the trigger electrode of the thyristor VS is connected with a bidirectional trigger diode D<8>. The utility model has the advantages that the inner of the designed starting circuit is provided with one time of automatically delay which can provide the time for cooling of a gas discharge lamp in the condition of high temperature. In addition, the self on-off of unidirectional thyristor of the utility model can create the condition that for the half-bridge inverting circuit restarting and triggering next time.

Description

Electric ballast
(1) technical field
The utility model relates to a kind of ballast, particularly relates to a kind of high-voltage gas discharging light electric ballast.
(2) background technology
Electric ballast has been widely used in the electric loop of gaseous discharge lamp, reaches little, the in light weight and energy-saving effect of volume.At present, though the protective circuit of electric ballast is varied, its executive circuit is identical substantially.Common drawback is: after protective circuit action, want to allow electric ballast resume work again, all require at first deenergization of user, wait for the several seconds, even after tens of seconds, power turn-on is again again.If this protective circuit is applied directly on the high-intensity gas discharge lamp, then many problems can appear.After being lighted, the fluorescent tube internal temperature raises as high-intensity gas discharge lamp, and lamp startability under the condition of high temperature is very poor, cause and start difficulty once more, in case have no progeny and send a telegram here immediately during power supply is unexpected, lamp all can not be reworked, and makes troubles to the user etc.
(3) summary of the invention
The purpose of this utility model; provide a kind of when guaranteeing that unexpected power failure is sent a telegram here again; integrated high-intensity gas discharge lamp energy operate as normal; when abnormality appears in circuit; in case circuit energy autoprotection is the electronic ballast for high-strength gas discharge lamp that circuit can carry out work again after recovering normally automatically.
The technical scheme that adopts is:
Electric ballast comprises housing parts and circuit part.
Circuit part comprises anti-jamming circuit, current rectifying and wave filtering circuit, half-bridge inversion circuit, load circuit, protective circuit and the delayed startup circuit that automatically resets.Anti-jamming circuit is by inductance L 1, L 2, capacitor C 1, C 2Be electrically connected to form.Current rectifying and wave filtering circuit is by bridge rectifier D ZAnd capacitor C 3Be electrically connected and form.Half-bridge inversion circuit is by switching tube VT 1, VT 2, saturable high frequency transformer T 1, resistance R 4, R 5, voltage-stabiliser tube W 1, W 2, W 3, W 4Be electrically connected to form, for the source branch road is arranged.Capacitor C 9, C 10Form the inactive side branch road.Load circuit is by reactor T 2, HID lamp, capacitor C 8Constitute, be connected between two intermediate point A, the B on active leg in the bridge circuit and passive road.Automatically reset the delayed startup circuit by capacitor C 4, C 6, resistance R 1, R 2, R 3, diode D 2, D 4VS is electrically connected to form with controllable silicon.Protective circuit is by reactor T 2, resistance R 6, R 7, diode D 1, D 7, D 8, capacitor C 7Be electrically connected to form, be peak value detection type protective circuit.Above-mentioned electric elements are installed on the circuit board, and circuit board is installed in the housing.
The operation principle of circuit:
The utility model adopts the protective circuit of peak value detection type, when the circuit operate as normal, and reactor T 2Pay winding T 2B transducing signal voltage is lower, through resistance R 6, R 7After the dividing potential drop, again through diode D 7Rectification and capacitor C 7After the filtering, resulting voltage always is lower than bidirectional trigger diode D 8Breakover voltage, so bidirectional trigger diode D 8The snowslide conducting can not occur, controllable silicon VS does not have current trigger to end because of the control utmost point, and protective circuit is inoperative, and circuit is in normal operating conditions always.In case when abnormal conditions such as high-intensity gas discharge lamp can not start occurring, line power tends to surpass normal operating conditions, the time slightly length can cause circuit element to damage.At this moment, be connected the reactor T that has in the half-bridge circuit in source branch road and the inactive side branch road 2And capacitor C 8Will produce strong series resonance, cause reactor T 2And capacitor C 8Voltage raises rapidly, also can make simultaneously reactor T 2Pay winding T 2B transducing signal voltage raises rapidly, through diode D 7Rectification and capacitor C 7Filtering obtains being enough to make two-way triggering diode D 8On voltage reach or be higher than its breakover voltage value, and avalanche breakdown for the controllable silicon VS control utmost point provides enough big trigger current, makes controllable silicon VS conducting immediately.After the VS conducting, switching tube VT 2Grid and the source class network through diode D 1One-way SCR VS ground connection is caused the control signal short circuit of half-bridge inversion circuit, makes the half-bridge oscillation circuit failure of oscillations, and therefore, the element in the circuit is protected.After the one-way SCR conducting, it makes capacitor C 4By one-way SCR VS discharge, capacitor C 4Discharging current descendingly change rapidly, up to capacitor C 4The extinction current of discharging current less than one-way SCR VS after, one-way SCR VS is become by conducting and ends, and controllable silicon can be automatically shut down, simultaneously capacitor C 4Also stop discharge.
After electric ballast powers up, the resistance R of flowing through 1, R 2Electric current to starting capacitor C 6Charging is because C 6Capacitance can not be too big, causes capacitor C 6Charging voltage rises very fast, works as capacitor C 6Both end voltage is elevated to bidirectional trigger diode D 4The breakover voltage value after, D 4Avalanche breakdown, capacitor C 6Pass through D 4To VT 2Grid and the network between source electrode discharge, make VT 2The beginning conducting.And by means of saturable high frequency transformer T 1Three winding T1a, T1b, T1c to coupling, set up the higher-order of oscillation, at VT 2Conduction period, start capacitor C 6Will be by diode D 3With switching tube VT 2Discharge makes capacitor C 6Voltage can't be elevated to two-way triggering diode D 4The breakover voltage value, make start-up circuit after the higher-order of oscillation is set up, quit work automatically.
Advantage of the present utility model is: in the half-bridge start-up circuit, design an additional delayed startup circuit that automatically resets especially, it is by diode D 2, D 4, capacitor C 4, C 6And resistance R 1, R 2, R 3Form with controllable silicon VS.Diode D 2Positive pole be connected capacitor C 6, resistance R 2, bidirectional trigger diode D 4Common node P point on, diode D 2Negative terminal be connected on capacitor C 4, resistance R 3, one-way SCR VS node K on.Because diode D 2Connecting an other branch road, after power supply powers up, the resistance R of flowing through 1, R 2Electric current also to pass through diode D 2Capacitor C to another branch road 4Charging, and also have a bleeder resistance R 3To the charging current discharge, its result causes capacitor C 6Charging voltage rise extremely slow, postpone the several seconds after capacitor C 6Charging voltage just can be elevated to bidirectional trigger diode D 4Breakover voltage, D 4Could avalanche breakdown, the higher-order of oscillation generations of could delay time, this has no progeny and sends a telegram here immediately in unexpected for powering, high-voltage gas discharging light is under the condition that works long hours, the fluorescent tube internal temperature raises, and lamp is the startability variation under the condition of high temperature, causes to start difficulty once more.In the designed start-up circuit of the utility model, there is an automatic time delay time, for the cooling of the gaseous discharge lamp under the condition of high temperature provides the time.
In addition, one-way SCR VS of the present utility model is connected in parallel on capacitor C 4On, capacitor C 4The operating current of descending rapid decline can be provided to one-way SCR, because the rapid decline of operating current, in case operating current is during less than the extinction current of one-way SCR, one-way SCR can become blocking state by conducting state, has solved the routine application that one-way SCR only could turn-off when cutting off the electricity supply and wait for that the several seconds was to tens of seconds.The shutoff voluntarily of one-way SCR is for triggering the condition of having created that starts the next time of half-bridge inversion circuit again.
(4) description of drawings
Fig. 1 is embodiment circuit theory diagrams of the present utility model.
(5) embodiment
Electric ballast comprises housing and circuit part.Circuit part comprises anti-jamming circuit, current rectifying and wave filtering circuit, half-bridge inversion circuit, load circuit, protective circuit and the half-bridge delayed startup circuit that automatically resets.Anti-jamming circuit comprises inductance L 1, L 2And capacitor C 1, C 2Capacitor C 1One termination L 1One end, another termination L 2An end.L 1Another termination capacitor C 2And bridge rectifier D Z1 pin, C 2Another termination L 2And D Z2 pin.Current rectifying and wave filtering circuit is by bridge rectifier D ZAnd capacitor C 3Form.C 3Positive pole meet D Z4 pin, C 3Negative pole meet D Z3 pin.Half-bridge inversion circuit comprises switching tube VT 1, VT 2, transformer T 1, resistance R 4, R 5, voltage-stabiliser tube W 1-W 4, capacitor C 9, C 10VT wherein 1, VT 2, T 1, R 4, R 5, W 1, W 2, W 3, W 4Forming has the source branch road.C 9, C 10Form the inactive side branch road, C 9, C 10After the series connection, C 9Meet D z4 pin, C 10Ground connection.Voltage-stabiliser tube W 1, W 2After the differential concatenation, W 1Negative pole meets VT 1Grid and resistance R 4, W 2Negative pole meets transformer T 1Winding T1b and and T1a, VT 1Source electrode be connected on jointly on the source intermediate point A.Another termination R of T1b 4, another termination reactor T of T1a 2The end of main winding T2a, another termination load H1D lamp and capacitor C of T2a 8, capacitor C 8Meet passive leg C with another utmost point of H1D lamp 9, C 10Intermediate point B point.Voltage-stabiliser tube W 3, W 4After the differential concatenation, W 2Negative pole meet VT 2Grid and resistance R 5And diode D 1W 4Negative pole, TV 2Source electrode, T1C winding common ground, another termination R of T1C 5Load circuit comprises reactor T 2And circuit C 8, the HID lamp.Capacitor C 8With connect with reactor T2a, transformer T1a again after the parallel connection of HID lamp, be connected on source intermediate point A and the inactive side intermediate point B.
Resistance R in the protective circuit 6, R 7Series connection back one termination reactor T 2An end of paying winding T2b, the other end ground connection of T2b.Resistance R 7Other end ground connection.Resistance R 6, R 7Contact meet D 7Anode, diode D 7Negative level and electrochemical capacitor C 7Series connection back C 7Minus earth.Bidirectional trigger diode D 8A termination D 7With C 7F point on the line, the trigger electrode of another termination controllable silicon VS.The delayed startup circuit that automatically resets comprises resistance R 1, R 2, R 3, capacitor C 4, C 6, diode D 2, D 4With controllable silicon VS.Resistance R 1, R 2With capacitor C 6Series connection back resistance R 1Connect bridge rectifier D z4 pin, capacitor C 6Ground connection, diode D 2Anodal connecting resistance R 2With capacitor C 6P point in the connection, D 2Negative pole connecting resistance R 3With electrochemical capacitor C 4Positive pole and the anode of controllable silicon VS.Resistance R 3Other end ground connection, C 4Minus earth, the minus earth of VS.

Claims (1)

1, electric ballast comprises housing and circuit part, and circuit part comprises anti-jamming circuit, current rectifying and wave filtering circuit, half-bridge inversion circuit, load circuit, protective circuit and the delayed startup circuit that automatically resets; Anti-jamming circuit is by inductance L 1, L 2, capacitor C 1, C 2Be electrically connected to form; Current rectifying and wave filtering circuit is by bridge rectifier D ZAnd capacitor C 3Be electrically connected and form, half-bridge inversion circuit is by switching tube VT 1, VT 2, saturable high frequency transformer T 1, resistance R 4, R 5, voltage-stabiliser tube W 1, W 2, W 3, W 4, capacitor C 9, C 10Be electrically connected to form; Protective circuit is by reactor T 2, resistance R 6, R 7, diode D 1, D 7, D 8, capacitor C 7Be electrically connected to form, load circuit is by reactor T 2, capacitor C 8Form with the H1D lamp, it is characterized in that: the delayed startup circuit that automatically resets comprises resistance R 1, R 2, R 3, capacitor C 4, C 6, diode D 2, D 4With controllable silicon VS; Resistance R 1, R 2And capacitor C 6After the series connection, resistance R 1Connect bridge rectifier D Z(4) pin, capacitor C 6Ground connection; Diode D 2Anodal connecting resistance R 2With capacitor C 6(P) point on the line, diode D 2Negative pole connecting resistance R 3An end and capacitor C 4Positive pole and the anode of controllable silicon VS, resistance R 3Other end ground connection, capacitor C 4Minus earth, the minus earth of controllable silicon VS, the trigger electrode of controllable silicon VS meets bidirectional trigger diode D 8
CN 200420070701 2004-09-20 2004-09-20 Electronic ballast Expired - Fee Related CN2737114Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200420070701 CN2737114Y (en) 2004-09-20 2004-09-20 Electronic ballast

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 200420070701 CN2737114Y (en) 2004-09-20 2004-09-20 Electronic ballast

Publications (1)

Publication Number Publication Date
CN2737114Y true CN2737114Y (en) 2005-10-26

Family

ID=35307840

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 200420070701 Expired - Fee Related CN2737114Y (en) 2004-09-20 2004-09-20 Electronic ballast

Country Status (1)

Country Link
CN (1) CN2737114Y (en)

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C14 Grant of patent or utility model
GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20051026

Termination date: 20120920