CN104735873A - Switching circuit and lamp compatible with fluorescent lamp ballast - Google Patents
Switching circuit and lamp compatible with fluorescent lamp ballast Download PDFInfo
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- CN104735873A CN104735873A CN201510119079.4A CN201510119079A CN104735873A CN 104735873 A CN104735873 A CN 104735873A CN 201510119079 A CN201510119079 A CN 201510119079A CN 104735873 A CN104735873 A CN 104735873A
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Abstract
The invention discloses a switching circuit which is compatible with fluorescent lamp ballast. The switching circuit comprises a rectifying module, a switching module and an LED driving module. The output end of the rectifying module is connected with the input end of the switching module. The output end of the switching module is connected with the input end of the LED driving module. The rectifying module is used for converting an alternating current of an external power supply into a direct current, and then outputting the direct current. When a voltage value output by the rectifying module is lower than a preset threshold value, impedance switching is carried out on the switching module, and equivalent impedance of the switching circuit is increased. The invention further discloses an LED lamp which is compatible with the fluorescent lamp ballast. The LED lamp comprises an LED module and the switching circuit which is compatible with the fluorescent lamp ballast. The output end of the LED driving module is connected with the LED module. The LED lamp which adopts the switching circuit can be fully compatible with direct power connection and one-with-one-type and one-with-more-type ballast of a current fluorescent lamp, and has the advantages of being simple and efficient in design, convenient to replace, and low in cost.
Description
Technical field
The present invention relates to lighting device technical field, be specifically related to a kind of change-over circuit and lamp of compatible fluorescent lamp ballast.
Background technology
Along with popularizing of contemporary LED illumination, LED starts to enter the family expenses epoch, but the fluorescent lamp of family expenses is generally fluorescent lamp, this kind of light fixture is typically equipped with inductance type, electronic ballast, and LED daylight lamp generally can not the ballast of this type of light fixture compatible to this, and this just gives and to install and replacement brings trouble, need dismounting and change wiring when mounted, once LED breaks down, can not connect again emergent by conventional fluorescent, to use and replacement brings trouble.
In prior art, there is the LED lamp device of some compatible fluorescent lamp ballasts, but directly can not connect electricity when can only accomplish compatible 1 multi-split ballast, and can not compatible 1 multi-split ballast when directly can connect electricity, this just needs a energy all compatible devices directly connecing electricity and compatible 1 multi-split ballast.
Summary of the invention
The present invention, in order to overcome at least one defect or deficiency in above-mentioned prior art, provides a kind of energy all compatible change-over circuits directly connecing electricity and compatible 1 multi-split ballast.
For solving the problems of the technologies described above, technical scheme of the present invention is as follows:
A change-over circuit for compatible fluorescent lamp ballast, comprises rectification module, handover module, LED drive module; Described rectification module output is connected with the input of described handover module; The output of described handover module is connected with the input of described LED drive module; Described rectification module, it is for being converted to direct current by the alternating current of external power source and exporting; Described handover module, when the magnitude of voltage that rectification module exports is lower than pre-set threshold value, carries out impedance switching, increases the equiva lent impedance of described change-over circuit.
Further, described handover module comprises linear voltage stabilization module, voltage detection module, self-locking switching control module;
Described linear voltage stabilization module is connected with described rectification module, and it is for changing the output voltage of described rectification module, for described voltage detection module and self-locking switching control module provide operating voltage; Described voltage detection module is connected with described rectification module, generates triggering signal at the magnitude of voltage that described rectification module exports lower than during pre-set threshold value, and by triggering signal transmissions to described self-locking switching control module; Described self-locking switching control module, it, for carrying out impedance switching according to the triggering signal received, increases the equiva lent impedance of described change-over circuit.
Further, described self-locking switching control module comprises self-locking control unit and impedance switch unit; Described impedance switch unit comprises large resistance unit, small resistor unit and state switch, and the resistance of described small resistor unit is much smaller than the resistance of large resistance unit; Described small resistor unit is connected with state switch and is formed impedance handoff leg; Described impedance handoff leg is in parallel with large resistance unit; Described self-locking control unit is used for the break-make according to described triggering signal state of a control diverter switch.
Further, described state switch is optical coupler (U1), and described optical coupler (U1) comprises photodiode and phototriode; Described photodiode, its anode is connected with described self-locking switching control module, and its negative electrode connects earthing potential; Described phototriode, its collector electrode connects the output of described optical coupler, and its emitter connects described LED drive module; Described phototriode controls its conducting state by described photodiode.
Further, described voltage detection module comprises the 7th resistance, the 8th resistance, the 9th resistance and controlled source of stable pressure.Described 7th resistance, the 8th resistance and the 9th resistance are sequentially connected in series; One end ground connection of described 9th resistance, the other end of described 9th resistance is connected with the reference pole of described controlled source of stable pressure; The plus earth of described controlled source of stable pressure, the negative electrode of described controlled source of stable pressure is connected with described self-locking switching control module.
Further, described self-locking switching unit comprises the 13 resistance, the 14 resistance, the 4th voltage stabilizing didoe and controllable silicon; One end of described 13 resistance is connected with the negative electrode of described controlled source of stable pressure and the negative electrode of described 4th voltage stabilizing didoe respectively, the other end of described 13 resistance and described linear voltage stabilization model calling; The anode of described 4th voltage stabilizing didoe controls pole with described silicon controlled and is connected; Described silicon controlled anode is connected with described one end of 14 resistance and the first input end of described optical coupler respectively; Described silicon controlled negative electrode is connected with the second input of earth terminal and described optical coupler respectively; The other end of described 14 resistance and described linear voltage stabilization model calling.
Further, described linear voltage stabilization module comprises the tenth resistance, the 11 resistance, the 12 resistance, the first voltage stabilizing didoe, the second voltage stabilizing didoe, the 3rd voltage stabilizing didoe, the first electric capacity and the first field effect transistor; The grid of described first field effect transistor is connected with the negative pole of the first voltage stabilizing didoe, the source electrode of described first field effect transistor is connected with the other end of described 13 resistance, the other end of described 14 resistance and described first electric capacity one end respectively, and the drain electrode of described first field effect transistor is connected with the anode of the second voltage stabilizing didoe; The plus earth of described first voltage stabilizing didoe, the negative electrode of described first voltage stabilizing didoe is connected with one end of the 11 resistance; The other end of described 11 resistance is connected with one end of the tenth resistance, and the other end of described tenth resistance is connected with the output of rectification module; The negative electrode of described second voltage stabilizing didoe is connected with the anode of the 3rd voltage stabilizing didoe, and the negative electrode of described 3rd voltage stabilizing didoe is connected with one end of the 12 resistance; The other end of described 12 resistance is connected with rectification module output; The other end ground connection of described first electric capacity.
Further, the second field effect transistor is connected with between the output of described impedance switch unit and described LED drive module, the drain electrode of described second field effect transistor is connected with the output of impedance switch unit, the grid of described second field effect transistor is connected with the negative electrode of described first voltage stabilizing didoe, and the source electrode of described second field effect transistor is connected with described LED drive module.
Further, described LED drive module comprises LED drived control chip, the 5th voltage stabilizing didoe, the 3rd field effect transistor, the 12 diode, the 15 resistance, the 18 resistance, the 19 resistance, the 20 resistance and some resistance capacitances; The internal electrical source of described LED drived control chip is connected with the source electrode of described second field effect transistor and the negative electrode of the 5th voltage stabilizing didoe respectively; The plus earth of described 5th voltage stabilizing didoe; Described 15 resistance one end is connected with the enable input of described LED drived control chip, and the other end of described 15 resistance is connected with the linearity light adjusting end of described LED drived control chip; The drive output of described LED drived control chip is connected with one end of described 18 resistance and described 19 resistance; The other end of described 18 resistance is connected with the negative electrode of described 12 diode; The anode of described 12 diode is connected with the other end of described 19 resistance and the grid of described 3rd field effect transistor respectively; One end of described 20 resistance is connected with one end of described 19 resistance; The other end of described 20 resistance is connected with the hunting of frequency control end of described LED drived control chip.
Another object of the present invention is to provide a kind of energy all compatible LED directly connecing electricity and compatible 1 multi-split ballast, and this modulated structure is simple, and it is convenient to replace.
For achieving the above object, technical scheme of the present invention is as follows: a kind of LED of compatible fluorescent lamp ballast, comprises the change-over circuit of LED module and above-mentioned compatible fluorescent lamp ballast, and the output of described LED drive module is connected with described LED module.
Beneficial effect of the present invention: the present invention adopts the LED of change-over circuit completely compatiblely directly can connect 1 of electricity and existing fluorescent lamp and drags 1 formula and 1 multi-split ballast, this light fixture has operating efficiency high, it is convenient to replace, and without the need to extracing ballast and replaceable, thus reduces costs.
Accompanying drawing explanation
figure1 be the change-over circuit of compatible fluorescent lamp ballast module signal
figure;
figure2 is the module of the change-over circuit of compatible fluorescent lamp ballast
figure3 is the signal of self-locking switching control module
figure;
figure4 is the circuit of the change-over circuit of compatible fluorescent lamp ballast
figure;
figure5 access the signal that 1 drags 2 formula ballasts for the present invention
figure.
Embodiment
Attached to those skilled in the art
figurein some known features and illustrate that may to omit be understandable.
Below in conjunction with attached
figurewith specific embodiment, technical scheme of the present invention is described further, but the present invention not limit by described specific embodiment.
Specific embodiment 1
As
figurethe module signal of the change-over circuit of a kind of compatible fluorescent lamp ballast shown in 1
figure, comprise rectification module 06, handover module, LED drive module 05; Described rectification module 06 output is connected with the input of described handover module; The output of described handover module is connected with the input of described LED drive module 05; Described rectification module 06, it is for being converted to direct current by the alternating current of external power source and exporting; Described handover module, when the magnitude of voltage that rectification module 06 exports is lower than pre-set threshold value, carries out impedance switching, increases the equiva lent impedance of described change-over circuit.
As
figurehandover module signal shown in 2
figure, described handover module comprises linear voltage stabilization module 03, voltage detection module 01, self-locking switching control module; Described linear voltage stabilization module 03 is connected with described rectification module 06, and it is for changing the output voltage of described rectification module 06, for described voltage detection module 01 and self-locking switching control module provide operating voltage; Described voltage detection module 01 is connected with described rectification module 06, and the magnitude of voltage exported at described rectification module 06 generates triggering signal lower than during pre-set threshold value, and by triggering signal transmissions to described self-locking switching control module; Described self-locking switching control module, it, for carrying out impedance switching according to the triggering signal received, increases the equiva lent impedance of described change-over circuit.
As
figureself-locking switching control module signal shown in 3
figure, described self-locking switching control module comprises self-locking control unit 02 and impedance switch unit 04; Described impedance switch unit 04 comprises large resistance unit 402, small resistor unit 401 and state switch, and the resistance of described small resistor unit 401 is much smaller than the resistance of large resistance unit 402; Described small resistor unit 401 is connected with state switch and is formed impedance handoff leg; Described impedance handoff leg is in parallel with large resistance unit 402; Described self-locking control unit 02 is for the break-make according to described triggering signal state of a control diverter switch.
Be further used as preferred embodiment, described state switch is optical coupler (U1), and described optical coupler (U1) comprises photodiode and phototriode; Described photodiode, its anode is connected with described self-locking switching control module, and its negative electrode connects earthing potential; Described phototriode, its collector electrode connects the output of described optical coupler, and its emitter connects described LED drive module 05; Described phototriode controls its conducting state by described photodiode.
Be further used as preferred embodiment, as
figurethe circuit of the change-over circuit of the compatible fluorescent lamp ballast shown in 4
figure, described voltage detection module 01 comprises the 7th resistance R7, the 8th resistance R8, the 9th resistance R9 and controlled source of stable pressure Q1.Described 7th resistance R7, the 8th resistance R8 and the 9th resistance R9 are sequentially connected in series; One end ground connection of described 9th resistance, the other end of described 9th resistance R9 is connected with the reference pole of described controlled source of stable pressure Q1; The plus earth of described controlled source of stable pressure Q1, the negative electrode of described controlled source of stable pressure Q1 is connected with described self-locking switching control module.In the present embodiment, controlled source of stable pressure Q1 adopts TL431 chip, and TL431 has good thermal stability, and the reference voltage with reference to pole is set to 2.5V, and namely when the dividing potential drop at R9 two ends is less than set point, anode and the negative electrode of TL431 chip switch to cut-off state.
Be further used as preferred embodiment, as
figurethe circuit of the change-over circuit of the compatible fluorescent lamp ballast shown in 4
figure, described self-locking switching unit 02 comprises the 13 resistance R13, the 14 resistance R14, the 4th voltage stabilizing didoe ZD4 and controllable silicon Q2; One end of described 13 resistance R13 is connected with the negative electrode of described controlled source of stable pressure Q1 and the negative electrode of described 4th voltage stabilizing didoe ZD4 respectively, and the other end of described 13 resistance R13 is connected with linear voltage stabilization module 03; The anode of described 4th voltage stabilizing didoe ZD4 is connected with the control pole of described controllable silicon Q2; The anode of described controllable silicon Q2 is connected with one end of described 14 resistance R14 and the first input end 1 of described optical coupler U1 respectively; The negative electrode of described controllable silicon Q2 is connected with second input 2 of earth terminal and described optical coupler U1 respectively; The other end of described 14 resistance R14 is connected with linear voltage stabilization module 03.In the present embodiment, controllable silicon Q2 adopts MCR16 chip, and MCR16 has the characteristic of sensitive triggering and well tolerable power, when the voltage controlling pole reaches trigger value, and the two poles of the earth conducting of MCR16 chip negative and positive.
Be further used as preferred embodiment, as
figurethe circuit of the change-over circuit of the compatible fluorescent lamp ballast shown in 4
figure, described linear voltage stabilization module 03 comprises the tenth resistance R10, the 11 resistance R11, the 12 resistance R12, the first voltage stabilizing didoe ZD1, the second voltage stabilizing didoe ZD2, the 3rd voltage stabilizing didoe ZD3, the first electric capacity C1 and the first field effect transistor M1; The grid of described first field effect transistor M1 is connected with the negative pole of the first voltage stabilizing didoe ZD1, and the source electrode of described first field effect transistor M1 is connected with described first electric capacity C1 one end, and the drain electrode of described first field effect transistor M1 is connected with the anode of the second voltage stabilizing didoe ZD2; The plus earth of described first voltage stabilizing didoe ZD1, the negative electrode of described first voltage stabilizing didoe ZD1 is connected with one end of the 11 resistance R11; The other end of described 11 resistance R11 is connected with one end of the tenth resistance R10, and the other end of described tenth resistance R10 is connected with the output of rectification module 06; The negative electrode of described second voltage stabilizing didoe ZD2 is connected with the anode of the 3rd voltage stabilizing didoe ZD3, and the negative electrode of described 3rd voltage stabilizing didoe ZD3 is connected with one end of the 12 resistance R12; The other end of described 12 resistance R12 is connected with rectification module 06 output; The other end ground connection of described first electric capacity C1.
Be further used as preferred embodiment, as
figurethe circuit of the change-over circuit of the compatible fluorescent lamp ballast shown in 4
figurethe second field effect transistor M2 is connected with between the output of described impedance switch unit 04 and described LED drive module 05, the drain electrode of described second field effect transistor M2 is connected with the output of impedance switch unit 04, the grid of described second field effect transistor M2 is connected with the negative electrode of described first voltage stabilizing didoe ZD1, and the source electrode of described second field effect transistor M2 is connected with described LED drive module 05.
Be further used as preferred embodiment, as
figurethe circuit of the change-over circuit of the compatible fluorescent lamp ballast shown in 4
figure, described LED drive module 05 comprises LED drived control chip U2, the 5th voltage stabilizing didoe ZD5, the 3rd field effect transistor M3, the 12 diode D12, the 15 resistance R15, the 18 resistance R18, the 19 resistance R19, the 20 resistance R20 and some non-essential resistance electric capacity; The internal electrical source VDD of described LED drived control chip U2 is connected with the source electrode of described second field effect transistor M2 and the negative electrode of the 5th voltage stabilizing didoe ZD5 respectively; The plus earth of described 5th voltage stabilizing didoe ZD5; Described 15 resistance R15 one end is connected with the enable input PWM-D of described LED drived control chip U2, and the other end of described 15 resistance R15 is connected with the linearity light adjusting end LD of described LED drived control chip U2; The drive output DRV of described LED drived control chip U2 is connected with one end of described 18 resistance R18 and described 19 resistance R19; The other end of described 18 resistance R18 is connected with the negative electrode of described 12 diode D12; The anode of described 12 diode D12 is connected with the other end of described 19 resistance R19 and the grid of described 3rd field effect transistor M3 respectively; One end of described 20 resistance R20 is connected with one end of described 19 resistance R19; The other end of described 20 resistance R20 is connected with the hunting of frequency control end of described LED drived control chip U2.In the present embodiment, LED drive module 05 adopts HV9910 chip, and HV9910 has the characteristic of high efficiency drive LED.Small resistor unit 401 adopts two resistance of connecting first resistance R1, the resistance of the second resistance R2 is 1K Ω; Large resistance unit 402 adopts four resistance R3, R4, R5, R6 series connection, and wherein R3, R4, R5 are 33K Ω, and R6 is 15K Ω.In this specific embodiment, the peripheral resistance capacitance of HV9910 chip also comprises the 16 resistance R16, the 17 resistance R17, the 21 resistance R21, the 22 resistance R22, the 23 resistance R23, the 24 resistance R24, the 25 resistance R25, the second electric capacity C2 and the 3rd electric capacity C3.Described 16 resistance R16 one end is connected with the linearity light adjusting end LD of HV9910 chip, the described 16 resistance R16 other end is connected with the earth terminal GND of described HV9910 chip, and described 17 resistance R17 and described 3rd electric capacity C3 is all connected in parallel with described 16 resistance R16.Described 21 resistance R21 one end is connected with the hunting of frequency control end Rosc of described HV9910 chip, the other end ground connection of described 21 resistance R21.Described 22 resistance R22 one end is connected with the current sample input CS of described HV9910 chip, described 22 resistance R22 other end ground connection; Described 23 resistance R23 and described 24 resistance R24 is all connected in parallel with described 22 resistance R22.Described 25 resistance R25 one end is connected with the internal electrical source VDD of described HV9910 chip, and the other end of described 25 resistance R25 is connected with the source electrode of described second field effect transistor M2.Described second electric capacity C2 and described 5th voltage stabilizing didoe ZD is connected in parallel.
As one preferred embodiment, as
figurethe circuit of the change-over circuit of the compatible fluorescent lamp ballast shown in 4
figure, described rectification module 06 comprises two bridge rectifiers 601 and filter circuit 602.
Described two bridge rectifiers 601 comprise the first diode D1 to the tenth diode D10, and the output of described bridge rectifier is connected with described filter circuit.
Described filter circuit 602 comprises the 4th electric capacity C4, the first electrochemical capacitor EC1, the second electrochemical capacitor EC2 and the first transformer LF1; Described 4th electric capacity C4 and the first electrochemical capacitor EC1 is connected in the input of described first transformer LF1 in parallel; The output of described first transformer LF1 is connected with described second electrochemical capacitor EC2, and the output of described first transformer LF1 is the output of rectification module.
Specific embodiment 2:
A LED for compatible fluorescent lamp ballast, comprises the change-over circuit of LED module and compatible fluorescent lamp ballast, and the output of described LED drive module 05 is connected with described LED module.
The output of HV9910 chip is connected with LED.
Switch working state and the linear working state of HV9910 chip is mainly used in the present embodiment.Described switch working state refers to when the voltage of the internal electrical source VDD of HV9910 chip is greater than the undervoltage lockout voltage threshold UVLO of VDD, drive output DRV exports high level, and now output current is worked by the mode of the peak current of the outside 3rd field effect transistor M3 of restriction.
Described linear working state refers to that HV9910 chip regulates the output current of LED thus the brightness of control LED continuously by the linear voltage regulation mode of linearity light adjusting end LD when the voltage of the linearity light adjusting end LD of HV9910 chip is lower than 250mV.
When the LED of the present embodiment directly connects electricity, electric current enters voltage detection module 01 through bridge rectifier and filter circuit, now the dividing potential drop at R9 two ends is greater than 2.5V, TL431 chip Q1 is in conducting state, 4th voltage stabilizing didoe ZD4 is in reverse blocking state, MCR16 chip Q2 is not triggered, be in cut-off state, optical coupler U1 is made to be in conducting state, large resistance unit place in circuit in parallel with small resistor unit, second field effect transistor M2 makes the internal electrical source vdd voltage of HV9910 driving chip remain on 12V, HV9910 driving chip is in switch working state.
Common LED lamp, when 2 formula ballast is dragged in access 1, is connected in series during two LED, due to two LED power invariability and have difference, according to formula
, the voltage of the LED that power is larger is larger, causes its equivalent resistance to increase, and causes its voltage to continue to increase further, finally causes the imbalance of circuit, cannot normally work.
As
figurethe present invention shown in 5 accesses the signal that 1 drags 2 formula ballasts
figure, the LED of the present embodiment is when 2 formula ballast is dragged in access 1, when the dividing potential drop that circuit input voltage is reduced to R9 two ends is less than set point 2.5V, TL431 chip Q1 switches to cut-off state, node voltage between TL431 chip Q1 and the 15 resistance R15 raises, cause the 4th voltage stabilizing didoe ZD4 to be reversed to puncture, thus trigger MCR16 chip Q2 conducting, the photodiode in optical coupler U1 is caused to be shorted, optical coupler U1 switches to cut-off state, small resistor unit: the first resistance R1 and the second resistance R2 series arm are namely by open circuit, the resistance of place in circuit only has large resistance unit, thus the impedance of circuit is raised, and then the voltage of circuit is raised.Now because the voltage of the internal electrical source VDD of HV9910 chip is lower than 12V, after dividing potential drop by the 15 resistance R15, the voltage of the linearity light adjusting end LD of HV9910 chip is lower than 250mV, HV9910 chip enters linear working state, trimming circuit through HV9910 chip reaches balance, and LED can normally be worked.
Attached
figuremiddle description position relationship for only for exemplary illustration, the restriction to this patent can not be interpreted as.
Obviously, the above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all execution modes.All any amendments done within the spirit and principles in the present invention, equivalent to replace and improvement etc., within the protection range that all should be included in the claims in the present invention.
Claims (10)
1. a change-over circuit for compatible fluorescent lamp ballast, is characterized in that, comprises rectification module (06), handover module, LED drive module (05); Described rectification module (06) output is connected with the input of described handover module; The output of described handover module is connected with the input of described LED drive module (05); Described rectification module (06), it is for being converted to direct current by the alternating current of external power source and exporting; Described handover module, when the magnitude of voltage that rectification module (06) exports is lower than pre-set threshold value, carries out impedance switching, increases the equiva lent impedance of described change-over circuit.
2. the change-over circuit of a kind of compatible fluorescent lamp ballast according to claim 1, is characterized in that, described handover module comprises linear voltage stabilization module (03), voltage detection module (01), self-locking switching control module;
Described linear voltage stabilization module (03) is connected with described rectification module (06), and it is for changing the output voltage of described rectification module (06), for described voltage detection module (01) and self-locking switching control module provide operating voltage;
Described voltage detection module (01) is connected with described rectification module (06), and the magnitude of voltage exported at described rectification module (06) generates triggering signal lower than during pre-set threshold value, and by triggering signal transmissions to described self-locking switching control module;
Described self-locking switching control module, it, for carrying out impedance switching according to the triggering signal received, increases the equiva lent impedance of described change-over circuit.
3. the change-over circuit of a kind of compatible fluorescent lamp ballast according to claim 2, is characterized in that, described self-locking switching control module comprises self-locking control unit (02) and impedance switch unit (04);
Described impedance switch unit (04) comprises small resistor unit (401), large resistance unit (402) and state switch, and the resistance of described small resistor unit (401) is much smaller than the resistance of large resistance unit (402);
Described small resistor unit (401) is connected with state switch and is formed impedance handoff leg;
Described impedance handoff leg is in parallel with large resistance unit (402);
Described self-locking control unit (02) is for the break-make according to described triggering signal state of a control diverter switch.
4. the change-over circuit of a kind of compatible fluorescent lamp ballast according to claim 3, is characterized in that, described state switch is optical coupler (U1), and described optical coupler (U1) comprises photodiode and phototriode; Described photodiode, its anode is connected with described self-locking control unit (02), and its negative electrode connects earthing potential; Described phototriode, its collector electrode connects described small resistor unit, and its emitter connects described LED drive module (05); Described phototriode controls its conducting state by described photodiode.
5. the change-over circuit of a kind of compatible fluorescent lamp ballast according to claim 4, is characterized in that, described voltage detection module (01) comprises the 7th resistance (R7), the 8th resistance (R8), the 9th resistance (R9) and controlled source of stable pressure (Q1);
Described 7th resistance (R7), the 8th resistance (R8) and the 9th resistance (R9) are sequentially connected in series between rectification module (06) and earth terminal;
One end ground connection of described 9th resistance (R9), the other end of described 9th resistance (R9) is connected with the reference pole of described controlled source of stable pressure (Q1);
The plus earth of described controlled source of stable pressure (Q1), the negative electrode of described controlled source of stable pressure (Q1) is connected with described self-locking switching control module.
6. the change-over circuit of a kind of compatible fluorescent lamp ballast according to claim 5, it is characterized in that, described self-locking control unit (02) comprises the 13 resistance (R13), the 14 resistance (R14), the 4th voltage stabilizing didoe (ZD4) and controllable silicon (Q2);
One end of described 13 resistance (R13) is connected with the negative electrode of described controlled source of stable pressure (Q1) and the negative electrode of described 4th voltage stabilizing didoe (ZD4) respectively, and the other end of described 13 resistance (R13) is connected with linear voltage stabilization module (03);
The anode of described 4th voltage stabilizing didoe (ZD4) is connected with the control pole of described controllable silicon (Q2);
The anode of described controllable silicon (Q2) is connected with described one end of 14 resistance (R14) and the first input end (1) of described optical coupler (U1) respectively;
The negative electrode of described controllable silicon (Q2) is connected with earth terminal respectively;
The other end of described 14 resistance (R14) is connected with described linear voltage stabilization module (03).
7. the change-over circuit of a kind of compatible fluorescent lamp ballast according to claim 6, it is characterized in that, described linear voltage stabilization module (03) comprises the tenth resistance (R10), the 11 resistance (R11), the 12 resistance (R12), the first voltage stabilizing didoe (ZD1), the second voltage stabilizing didoe (ZD2), the 3rd voltage stabilizing didoe (ZD3), the first electric capacity (C1) and the first field effect transistor (M1);
The grid of described first field effect transistor (M1) is connected with the negative pole of the first voltage stabilizing didoe (ZD1), the source electrode of described first field effect transistor (M1) is connected with the other end of described 13 resistance (R13), the other end of described 14 resistance (R14) and described first electric capacity (C1) one end respectively, and the drain electrode of described first field effect transistor (M1) is connected with the anode of the second voltage stabilizing didoe (ZD2);
The plus earth of described first voltage stabilizing didoe (ZD1), the negative electrode of described first voltage stabilizing didoe (ZD1) is connected with one end of the 11 resistance (R11);
The other end of described 11 resistance (R11) is connected with one end of the tenth resistance (R10), and the other end of described tenth resistance (R10) is connected with the output of rectification module (06);
The negative electrode of described second voltage stabilizing didoe (ZD2) is connected with the anode of the 3rd voltage stabilizing didoe (ZD3), and the negative electrode of described 3rd voltage stabilizing didoe (ZD3) is connected with one end of the 12 resistance (R12);
The other end of described 12 resistance (R12) is connected with rectification module (06) output;
The other end ground connection of described first electric capacity (C1).
8. the change-over circuit of a kind of compatible fluorescent lamp ballast according to claim 7, it is characterized in that, the second field effect transistor (M2) is connected with between described impedance switch unit (04) and described LED drive module (05), the drain electrode of described second field effect transistor (M2) is connected with the output of impedance switch unit (04), the grid of described second field effect transistor (M2) is connected with the negative electrode of described first voltage stabilizing didoe (ZD1), and the source electrode of described second field effect transistor (M2) is connected with described LED drive module (05).
9. the change-over circuit of a kind of compatible fluorescent lamp ballast according to claim 8, it is characterized in that, described LED drive module (05) comprises LED drived control chip (U2), the 5th voltage stabilizing didoe (ZD5), the 3rd field effect transistor (M3), the 12 diode (D12), the 15 resistance (R15), the 18 resistance (R18), the 19 resistance (R19), the 20 resistance (R20) and some resistance capacitances;
The internal electrical source (VDD) of described LED drived control chip (U2) is connected with the source electrode of described second field effect transistor (M2) and the negative electrode of the 5th voltage stabilizing didoe (ZD5) respectively; The plus earth of described 5th voltage stabilizing didoe (ZD5);
Described 15 resistance (R15) one end is connected with the enable input (PWM-D) of described LED drived control chip (U2), and the other end of described 15 resistance (R15) is connected with the linearity light adjusting end (LD) of described LED drived control chip (U2);
The drive output (DRV) of described LED drived control chip (U2) is connected with one end of described 18 resistance (R18) and described 19 resistance (R19); The other end of described 18 resistance (R18) is connected with the negative electrode of described 12 diode (D12);
The anode of described 12 diode (D12) is connected with the other end of described 19 resistance (R19) and the grid of described 3rd field effect transistor (M3) respectively;
One end of described 20 resistance (R20) is connected with one end of described 19 resistance (R19); The other end of described 20 resistance (R20) is connected with the hunting of frequency control end (Rosc) of described LED drived control chip (U2).
10. a LED for compatible fluorescent lamp ballast, comprises LED module, it is characterized in that, also comprises the change-over circuit described in any one of claim 1 to 9, and the output of described LED drive module (05) is connected with described LED module.
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| CN201510119079.4A CN104735873B (en) | 2015-03-18 | 2015-03-18 | A kind of change-over circuit and lamp of compatible fluorescent lamp ballast |
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