CN102036457B - Electronic ballast-based programmable voltage controlled oscillator (VCO) circuit - Google Patents
Electronic ballast-based programmable voltage controlled oscillator (VCO) circuit Download PDFInfo
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- CN102036457B CN102036457B CN 201010298844 CN201010298844A CN102036457B CN 102036457 B CN102036457 B CN 102036457B CN 201010298844 CN201010298844 CN 201010298844 CN 201010298844 A CN201010298844 A CN 201010298844A CN 102036457 B CN102036457 B CN 102036457B
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Abstract
The invention discloses an electronic ballast-based programmable voltage controlled oscillator (VCO) circuit, which comprises a time sequence control logic unit, a current control unit and a VCO unit, wherein the time sequence control logic unit is used for sampling the operating state of a lamp, converting the operating state of the lamp into a control signal and outputting the control signal; the current control unit is connected with the time sequence control logic unit and is used for regulating output current according to the control signal output by the time sequence control logic unit; and the VCO unit is connected with the current control unit and is used for regulating the oscillating frequency of the output current of the current control unit according to the intensity of the output current and outputting a square signal to a subsequent circuit. The operating frequency of the programmable VCO circuit disclosed by the invention can be regulated by an off chip external resistor, and by selecting the resistance of the off chip resistor, a time constant matched with a circuit parameter can be obtained; therefore, according to different actual conditions, different resistances can be selected to set different VCO oscillation frequency constants, and an electronic ballast can be better protected.
Description
Technical field
The operating frequency that the present invention relates to a kind of electronic ballast for fluoresent lamp produces circuit, relates in particular to a kind of VCO circuit able to programme based on electric ballast.
Background technology
VCO (voltage controlled oscillator) circuit more and more obtains designer's attention as the core of electric ballast, and when ballast worked in the abnormality of defined among the GB GB19510.4, seriously heating caused inner member to be burnt probably." good reputation " that " power saving does not save money " therefore arranged considers that from economic angle the utmost point is to one's profit.
The VCO design circuit that some are arranged in the prior art, all be based on RC discharged and recharged and grow up on the basis, with Sense FET (sampling pipe) output voltage of fluorescent tube is sampled in the electric ballast, send in the comparator then and compare, and comparison signal is sent into the sequential logic control unit handle, and as the control signal of VCO circuit input.But its circuit complexity, factors such as easy triggering cause electric ballast work extremely unstable, have greatly consumed power consumption.It is unadjustable to design the VCO power frequency simultaneously, and when it was applied to different fluorescent tube, the operating efficiency of lamp also had very big-difference.
Summary of the invention
The objective of the invention is at above-mentioned electric ballast VCO complex circuit designs and the single problem of frequency adjustment, a kind of VCO circuit able to programme that can be simple is provided.
In order to achieve the above object, the invention provides a kind of VCO circuit able to programme based on electric ballast, comprising: the time sequence control logic unit is used for the operating state of lamp is sampled and is translated into control signal output; Current control unit is connected with described time sequence control logic unit, is used for regulating output current according to the control signal of described time sequence control logic unit output; And the VCO unit, be connected with described current control unit, be used for according to its frequency of oscillation of size adjustment of the output current of described current control unit and export square-wave signal offering subsequent conditioning circuit.
VCO circuit able to programme based on electric ballast of the present invention, wherein, the sampling of described sequential logic control unit by the voltage of fluorescent tube when being in the different operating state is converted into output control signal when should be the lamp operating state mutually, for current control unit provides control signal.
VCO circuit able to programme based on electric ballast of the present invention, wherein, described current control unit is controlled the break-make of each branch switch pipe by different control signals, thereby regulates output current.
VCO circuit able to programme based on electric ballast of the present invention, wherein, described switching tube is a metal-oxide-semiconductor.
VCO circuit able to programme based on electric ballast of the present invention, wherein, the output current of described VCO unit by described current control unit, mirror image goes out different operating currents, and the capacitor cell of its inside is discharged and recharged; The size of described operating current has determined the time length of electric capacity charging, thereby changes the operating frequency of VCO unit.
VCO circuit able to programme based on electric ballast of the present invention, wherein, described current control unit can be regulated output current by the resistance size of adjusting outer meeting resistance, thereby sets the frequency of oscillation of VCO unit.
Described time sequence control logic unit has two outputs;
Described current control unit is by comparator I0, PMOS manages M0, NMOS manages M3, and respectively by resistance R 1 and NMOS pipe M5, resistance R 1 and NMOS pipe M4, three branch roads that resistance R 0 constitutes are formed, wherein, two outputs of described time sequence control logic unit are managed M4 with NMOS respectively, the grid of NMOS pipe M5 connects, NMOS manages M4, the source electrode of NMOS pipe M5, base stage connects with ground, NMOS manages M4, the drain electrode of NMOS pipe M5 then is attached to an end of resistance R 1 together, the positive input of comparator I0 connects the reference power source of 2.0V, one end of its negative input and resistance R 1, one end of resistance R 0, and the source electrode of NMOS pipe M3, base stage connects, corresponding comparator I0 output connects with the grid of NMOS pipe M3, the drain electrode of the drain electrode of NMOS pipe M3 and PMOS pipe M0, grid connects, the source class of PMOS pipe M0, the maximum potential vddh! of the equal connection circuit of base stage
Described VCO unit 1 is made up of two signal comparing units, rest-set flip-flop I3, the biasing circuit of two signal comparing units is respectively, constitute the biasing circuit of first signal comparing unit by PMOS pipe M1, NMOS pipe M6 and capacitor C 0, constitute the biasing circuit of second signal comparing unit by PMOS pipe M2, NMOS pipe M7 and capacitor C 1, the grid of PMOS pipe M1, PMOS pipe M2 all connects with source electrode, the drain electrode of PMOS pipe M0 in the current control unit, and PMOS manages source electrode, the base stage that M1, PMOS manage M2 and all connects maximum potential vddh! The drain electrode of PMOS pipe M1 then connects with the positive input of comparator I1, the positive plate of capacitor C 0, the drain electrode of NMOS pipe M6, the drain electrode of PMOS pipe M2 then connects with the negative input of comparator I2, the positive plate of capacitor C 1, the drain electrode of NMOS pipe M7, and source electrode, the base stage of NMOS pipe M6, NMOS pipe M7 all connect potential minimum gnd! The grid of NMOS pipe M6, NMOS pipe M7 all connects with the output Q end of rest-set flip-flop I3, the negative input of comparator I1 connects with the reference power source of 3.7V, the output of comparator I1 connects with the set end of rest-set flip-flop I3, the positive input of comparator I2 connects with the reference power source of 0.9V, and the output of comparator I2 connects with the reset terminal of rest-set flip-flop I3.
By technique scheme as can be known; beneficial effect of the present invention is: the operating frequency of VCO circuit able to programme of the present invention can be regulated by the outer outer meeting resistance of sheet; by selecting the size of off chip resistor resistance; can obtain the time constant of being mated with circuit parameter; thereby can select different resistances to set different VCO frequency of oscillation constants, better protection electric ballast according to different actual conditions.VCO circuit able to programme provided by the invention and existing circuit of power factor correction, oscillating circuit, the common electric ballast of forming of half-bridge inversion circuit, when fluorescent tube is in different operating states, the VCO circuit all can be the back circuit reliable square wave frequency is provided, and can work normally to guarantee lamp.
Description of drawings
The electric ballast that Fig. 1 proposes for IR is exported the frequency variation curve of square wave;
Fig. 2 is the structured flowchart of the present invention's VCO circuit able to programme;
Fig. 3 is the circuit diagram of the present invention VCO circuit one embodiment able to programme;
Fig. 4 is the emulation sequential chart of Fig. 3 embodiment.
Embodiment
Describe embodiments of the present invention with reference to the accompanying drawings in conjunction with the embodiments in detail.
Referring to Fig. 1, it is the frequency variation curve of the electric ballast output square wave that proposes of IR (Int Rectifier Corp), when the lamp operate as normal, and the square wave frequency that electric ballast must provide to subsequent conditioning circuit.Fluorescent lamp normally starts must experience preheating (Preheat), igniting (Ignition), operation (Run) 3 stages.It is all inconsistent that each stage electric ballast offers the signal frequency of fluorescent lamp work.The variation of the operating frequency of fluorescent lamp desired signal when therefore, the VCO circuit need be considered the different operating state.
Referring to Fig. 2, it is the structured flowchart of the present invention's VCO circuit able to programme, comprises VCO unit, current control unit and time sequence control logic unit.The time sequence control logic unit is mainly handled the signal that the voltage at lamp equivalent electric circuit two ends is sampled, and the operating state different according to lamp, exports different control logic signals.The break-make of each branch switch pipe in the different output control logic signal controlling current control units.Each switch tube working status changes and causes that VCO unit input current takes place by corresponding the change in the current control unit; Described switching tube can be metal-oxide-semiconductor.The VCO unit goes out different operating currents according to the input current mirror image, and the capacitor cell of its inside is discharged and recharged; The size of described operating current has determined the time length of electric capacity charging, thereby changes the operating frequency of VCO unit.Described current control unit can be regulated output current by the resistance size of adjusting outer meeting resistance, thereby sets the frequency of oscillation of VCO unit.
Referring to Fig. 3, it is for the circuit diagram of the present invention VCO circuit one embodiment able to programme.In the present embodiment, VCO circuit able to programme is made up of VCO unit 1, current control unit 2, time sequence control logic unit 3.Two outputs of time sequence control logic unit 3 connect with the grid (G) of two branch road M4, M5 in the current control unit 2 respectively.The source electrode of metal-oxide-semiconductor M4, M5 (S), base stage (B) connect with ground, and drain electrode (D) then is attached to the end of R1 together.Current control unit 2 is made up of comparator I0, PMOS pipe M0, NMOS pipe M3, three branch roads (R1-M5, R1-M4, R0).The positive input of comparator I0 connects the reference power source of 2.0V, and its negative input connects with an end, the end of R0, the source electrode (S) of metal-oxide-semiconductor M3, the base stage (B) of R1, and corresponding I0 output connects with the grid of metal-oxide-semiconductor M3.The drain electrode of metal-oxide-semiconductor M3 (D) connects with drain electrode (D), the grid (G) of metal-oxide-semiconductor M0.The source class of metal-oxide-semiconductor M0 (S), base stage (B) all the maximum potential of connection circuit (vddh! ).VCO unit 1 is made up of two signal comparing units, rest-set flip-flop I3.The bias circuit construction of two signal comparing units is similar.Metal-oxide-semiconductor M1, M6 and capacitor C 0 constitute the biasing circuit of first signal comparing unit.Metal-oxide-semiconductor M2, M7 and capacitor C 1 constitute the biasing circuit of second signal comparing unit.The grid of metal-oxide-semiconductor M1, M2 (G) all with current control unit 2 in metal-oxide-semiconductor M0 source electrode (S), the drain electrode (D) connect, its source electrode (S), base stage (B) all connect maximum potential (vddh! ).The drain electrode of metal-oxide-semiconductor M1 (D) then connects with the positive input of comparator I1, the positive plate of capacitor C 0, the drain electrode (D) of metal-oxide-semiconductor M6.The drain electrode of metal-oxide-semiconductor M2 (D) then connects with the negative input of comparator I2, the positive plate of capacitor C 1, the drain electrode (D) of metal-oxide-semiconductor M7.The source electrode of metal-oxide-semiconductor M6, M7 (S), base stage (B) all connect potential minimum (gnd! ), its grid (G) all connects with the output Q end of rest-set flip-flop I3.The positive input of comparator I1 is except that with the drain electrode (D) of M1 connects, and its negative input then connects with the reference power source of 3.7V.The output of I1 connects with the set end (S) of rest-set flip-flop I3.The negative input of comparator I2 is except that with the drain electrode (D) of M2 connects, and its positive input then connects with the reference power source of 0.9V.The output of I2 connects with the reset terminal (R) of rest-set flip-flop I3.
The operation principle of the VCO circuit able to programme of this embodiment of the invention:
(1) when lamp is operated in warm-up phase (Preheat Phase), one output (out1) output of time sequence control logic unit 3 is near the high level of 5V, connect metal-oxide-semiconductor M4 opens with it, branch road R1-M4 access circuit, the electric current in the current control unit 2 is determined jointly by the equivalent resistance of branch road R1-M4 and external programming resistors R0 at this moment.Because of the breadth length ratio (W/L) very big (about 100) of MOS switching tube M4, so resistance less (its resistance scope is 200～300 Ω) during conducting.Than the resistance of resistance R 1 (65K Ω), its value can be ignored relatively, and in fact all-in resistance is determined with the effective resistance in parallel of R2 by R1.Two comparator unit I1, I2 biasing circuit are based on the circuit structure on the mirror current source basis in the VCO unit 1.Electric current in current control unit 2 is certain, thus the VCO unit in each branch current also can decide accurately.And the breadth length ratio (W/L) of setting each PMOS pipe equates, so two branch currents equate in the VCO unit.During VCO unit operate as normal, two branch currents charge to each branch road capacitor C 0, C1 accordingly.When the voltage on C0, the C1 all is charged to 3.7V when above, comparator I1 exports high level " 1 ", and the set end (S) of the trigger of RS is by set, corresponding output Q output high level " 1 ", and metal-oxide-semiconductor M6, M7 open accordingly in the biasing circuit.Capacitor C 0, C1 begin to discharge because of M6, M7 access circuit.When the voltage on C0, the C1 is released into 0.7V when following, comparator I2 is output as high level " 1 ", the reset terminal of rest-set flip-flop (R) is by set, corresponding output Q output low level " 0 ", and metal-oxide-semiconductor M6, M7 are opened from circuit interruption accordingly in the biasing circuit.The VCO unit begins to continue C0, C1 are charged, and VCO restarts the unit new one and discharges and recharges the cycle.
(2) when lamp is operated in ignition phase (Ignition Phase), the output of another output (out2) of time sequence control logic unit 3 is near the low level of 8mV-15mV, and output (out1) is by reset simultaneously, branch road R1-M5 access circuit.Metal-oxide-semiconductor M5 is operated in linear zone at this moment, the magnitude tens K Ω of its conducting resistance.Electric current in the current control unit 2 is determined jointly by the equivalent resistance of branch road R1-M5 and external programming resistors R0 at this moment.M5 is operated in linear zone because of the MOS switching tube, and its resistance be can not ignore, and in fact all-in resistance is determined jointly by the resistance of branch road R1-M5 and the parallel resistance of R2.Compare with effective all-in resistance of warm-up phase, the effective resistance in this stage has increase significantly, so the charging current in the VCO unit 1 has reducing of going up largely, the frequency of oscillation of corresponding VCO has very big reducing.The VCO unit begins to continuing C0, C1 to be charged under this electric current, discharges and recharges the cycle thereby begin new one.
(3) when lamp is operated in the operation phase (Run Phase), the output of another output (out2) of time sequence control logic unit 3 near 15mV stable low level, output (out1) is by reset simultaneously, branch road R1-M5 is access circuit still.Metal-oxide-semiconductor M5 is operated in linear zone at this moment, the magnitude tens K Ω of its conducting resistance.Electric current in the current control unit 2 is determined jointly by the equivalent resistance of branch road R1-M5 and external programming resistors R0.M5 is operated in linear zone because of the MOS switching tube, and its resistance be can not ignore, and in fact all-in resistance is determined jointly by the resistance of branch road R1-M5 and the parallel resistance of R2.Compare with ignition phase, the M5 conducting resistance of metal-oxide-semiconductor of this moment has reducing to a certain degree, so the effective resistance in this stage has reducing on the less degree, so the charging current in the VCO unit 1 has the increase on the less degree, the frequency of oscillation of corresponding VCO has the increase on the less degree.The VCO unit begins to continuing C0, C1 to be charged under this electric current, discharges and recharges the cycle thereby begin new one.
Referring to Fig. 4, it is the emulation sequential chart of Fig. 3 embodiment.When lamp normally starts, VCO circuit output square wave sequential chart.The scope that lamp starts, the magnitude of warm-up time maintains second is in order to obtain simulation result fast, selected less T warm-up time (180u s) and the T duration of ignition (100u s).And the resistance of resistance was inversely proportional to when this circuit need satisfy VCO frequency of oscillation and each branch road conducting of current control unit.When lamp is in preheating (Ignition) during the stage, high level about the output of time sequence control logic unit 1 (vout1) output 5V, metal-oxide-semiconductor M4 signal level (Preheat_Phase_Contro1_G) is a high level, and the branch road that resistance R 1, metal-oxide-semiconductor M4 are formed has electric current to flow through.Because of the breadth length ratio (W/L) of MOS switching tube M4 is bigger, corresponding conducting resistance is less.Ignore metal-oxide-semiconductor M4 conducting resistance, branch road resistance can be approximately the resistance of resistance R 1, and what the effective resistance of this moment was R0 with R1 is in parallel.When lamp was in igniting, operation phase, metal-oxide-semiconductor M4 opened from circuit interruption, metal-oxide-semiconductor M5 access circuit, and the branch road that resistance R 1, metal-oxide-semiconductor M5 are formed has electric current to flow through.Can know that from simulation waveform the grid voltage level range of metal-oxide-semiconductor M5 is between 1.654-2.039V.Because of the breadth length ratio (W/L) of metal-oxide-semiconductor M5 is little a lot of than metal-oxide-semiconductor M3, and be operated in linear zone, so the resistance magnitude of M5 pipe is between tens K Ω.The resistance of branch road resistance is the resistance sum of the effective resistance and the R1 of M5 pipe.Than warm-up phase, the resistance of branch road resistance has had largely to be increased, so the frequency of oscillation of VCO unit reduces on having largely.In view of the effective resistance of ignition phase metal-oxide-semiconductor M5 greater than the operation phase effective resistance, so the VCO unit has by a small margin increase in the frequency of operation phase than the frequency of warm-up phase.In order to obtain accurate simulation result, increase warm-up time, the duration of ignition, make its order of magnitude that is close to second, can truly reflect the reflection that VCO unit output frequency has been done this moment.
The above only is preferred embodiment of the present invention, non-limitation protection scope of the present invention, and the equivalent structure that all utilizations specification of the present invention and accompanying drawing content are done changes, and all is contained in protection scope of the present invention.
Claims (1)
1. the VCO circuit able to programme based on electric ballast is characterized in that, comprising:
The time sequence control logic unit is used for the operating state of lamp is sampled and is translated into control signal output;
Current control unit is connected with described time sequence control logic unit, is used for regulating output current according to the control signal of described time sequence control logic unit output; And
The VCO unit is connected with described current control unit, is used for according to its frequency of oscillation of size adjustment of the output current of described current control unit and exports square-wave signal offering subsequent conditioning circuit;
Described time sequence control logic unit has two outputs;
Described current control unit is by comparator I0, PMOS manages M0, NMOS manages M3, and respectively by resistance R 1 and NMOS pipe M5, resistance R 1 and NMOS pipe M4, three branch roads that resistance R 0 constitutes are formed, wherein, two outputs of described time sequence control logic unit are managed M4 with NMOS respectively, the grid of NMOS pipe M5 connects, NMOS manages M4, the source electrode of NMOS pipe M5, base stage connects with ground, NMOS manages M4, the drain electrode of NMOS pipe M5 then is attached to an end of resistance R 1 together, the positive input of comparator I0 connects the reference power source of 2.0V, one end of its negative input and resistance R 1, one end of resistance R 0, and the source electrode of NMOS pipe M3, base stage connects, corresponding comparator I0 output connects with the grid of NMOS pipe M3, the drain electrode of the drain electrode of NMOS pipe M3 and PMOS pipe M0, grid connects, the source class of PMOS pipe M0, the maximum potential vddh! of the equal connection circuit of base stage
Described VCO unit is made up of two signal comparing units, rest-set flip-flop I3, the biasing circuit of two signal comparing units is respectively, constitute the biasing circuit of first signal comparing unit by PMOS pipe M1, NMOS pipe M6 and capacitor C 0, constitute the biasing circuit of second signal comparing unit by PMOS pipe M2, NMOS pipe M7 and capacitor C 1, the grid of PMOS pipe M1, PMOS pipe M2 all connects with source electrode, the drain electrode of PMOS pipe M0 in the current control unit, and PMOS manages source electrode, the base stage that M1, PMOS manage M2 and all connects maximum potential vddh! The drain electrode of PMOS pipe M1 then connects with the positive input of comparator I1, the positive plate of capacitor C 0, the drain electrode of NMOS pipe M6, the drain electrode of PMOS pipe M2 then connects with the negative input of comparator I2, the positive plate of capacitor C 1, the drain electrode of NMOS pipe M7, and source electrode, the base stage of NMOS pipe M6, NMOS pipe M7 all connect potential minimum gnd! The grid of NMOS pipe M6, NMOS pipe M7 all connects with the output Q end of rest-set flip-flop I3, the negative input of comparator I1 connects with the reference power source of 3.7V, the output of comparator I1 connects with the set end of rest-set flip-flop I3, the positive input of comparator I2 connects with the reference power source of 0.9V, and the output of comparator I2 connects with the reset terminal of rest-set flip-flop I3.
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| CN 201010298844 CN102036457B (en) | 2010-09-29 | 2010-09-29 | Electronic ballast-based programmable voltage controlled oscillator (VCO) circuit |
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| CN 201010298844 CN102036457B (en) | 2010-09-29 | 2010-09-29 | Electronic ballast-based programmable voltage controlled oscillator (VCO) circuit |
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| CN102036457B true CN102036457B (en) | 2013-07-24 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1328413A (en) * | 2000-06-12 | 2001-12-26 | 松下电工株式会社 | Electronic ballast for discharging lamp |
| CN200941703Y (en) * | 2005-12-29 | 2007-08-29 | 飞利浦(中国)投资有限公司 | Pulse generator for electronic ballast |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6639368B2 (en) * | 2001-07-02 | 2003-10-28 | Koninklijke Philips Electronics N.V. | Programmable PWM module for controlling a ballast |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1328413A (en) * | 2000-06-12 | 2001-12-26 | 松下电工株式会社 | Electronic ballast for discharging lamp |
| CN200941703Y (en) * | 2005-12-29 | 2007-08-29 | 飞利浦(中国)投资有限公司 | Pulse generator for electronic ballast |
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