CN109287032A - Based on the time-controlled Christmas lamp of mains frequency - Google Patents
Based on the time-controlled Christmas lamp of mains frequency Download PDFInfo
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- CN109287032A CN109287032A CN201811197576.6A CN201811197576A CN109287032A CN 109287032 A CN109287032 A CN 109287032A CN 201811197576 A CN201811197576 A CN 201811197576A CN 109287032 A CN109287032 A CN 109287032A
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- 238000005070 sampling Methods 0.000 claims abstract description 20
- 230000002093 peripheral effect Effects 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 33
- 230000005611 electricity Effects 0.000 claims description 13
- 230000001934 delay Effects 0.000 claims description 2
- 239000013078 crystal Substances 0.000 description 6
- 239000004065 semiconductor Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The present invention provides one kind to be based on the time-controlled Christmas lamp of mains frequency, including power supply control chip, power supply control chip and transformer and peripheral circuit constitute Switching Power Supply, transformer includes the primary coil of primary side, the secondary coil of ancillary coil and primary side, power supply control chip setting transformer primary and and primary coil, ancillary coil connection, it further include alternating current sampling circuit, timing and control circuit, voltage commutation circuit, RC delay circuit and the Christmans light string being connect with transformer secondary, power supply control chip and primary coil, ancillary coil and voltage commutation circuit connection, alternating current sampling circuit access power grid input terminal is simultaneously periodically connect with the first end of control circuit, timing is connect with the first end of the second end of control circuit and voltage commutation circuit, the second end of voltage commutation circuit is connect with RC delay circuit.It is of the invention timing controlled to be realized based on the time-controlled Christmas lamp of mains frequency and timing accuracy is improved, while there is lower cost.
Description
Technical field
The present invention relates to one kind to be based on the time-controlled Christmas lamp of mains frequency.
Background technique
As shown in Figure 1, traditional timing christmas light structure includes power supply control chip, timing controlled single-chip microprocessor MCU
(Microcontroller Unit), crystal oscillator pipe, transformer, Christmas lamp and Christmas lamp switch metal-oxide-semiconductor (metal (metal)-
Oxide (oxide)-semiconductor (semiconductor) field effect transistor), transformer include primary side primary coil,
The secondary coil of ancillary coil and primary side, ancillary coil access first resistor, second resistance, the second capacitor and the two or two pole
Pipe, the first end of first resistor connect with the first end of the second capacitor and access ancillary coil, the second end of second resistance and the
The first end of two resistance connects, and the second end access secondary coil of second resistance is simultaneously grounded, the second end ground connection of the second capacitor, the
Two diodes access the first end of first resistor, and power supply control chip accesses primary coil and ancillary coil, connects on primary coil
Enter the first end of first diode and first capacitor, the second end ground connection of first capacitor.The secondary coil of primary side accesses third
The first end of diode and third capacitor, the second end ground connection of third capacitor.Secondary coil, the other end are accessed in one end of Christmas lamp
Connect with the drain electrode of Christmas lamp switch metal-oxide-semiconductor, the grid and source electrode of metal-oxide-semiconductor access MCU are simultaneously grounded, crystal oscillator pipe access MCU and
The first end of crystal oscillator pipe is connect with the first end of the 5th capacitor, and the second end of crystal oscillator pipe is connect with the first end of the 6th capacitor, the
The second end of five capacitors and the 6th capacitor ground connection.MCU, which is also accessed, the 4th resistance and the 4th capacitor, the first end of the 4th resistance with
Power supply connection, the second end of the 4th resistance are connect with the first end of the 4th capacitor, the 4th electricity of first end access of the 4th diode
The control terminal of resistance and the 4th capacitor, the second end of the 4th diode and the second end connect and ground of the 4th capacitor.In existing skill
In art, power supply control chip provide Christmas lamp constant current drive control, and MCU only be responsible for timing ga(u)ge when and timing controlled, timing
Control is then needed using crystal oscillator pipe to guarantee timing accuracy.More troublesome to be, traditional timing Christmas lamp also needs special
Switch is to disconnect Christmas lamp (because power unit can not be turned off).Phenomenon described above bring consequence is not only timing
It cannot be guaranteed precision, production trouble and also at high cost, inefficiency.
Summary of the invention
The purpose of the present invention is to provide a kind of guarantee timing accuracy, and it is low in cost and have efficient based on power grid
The time-controlled Christmas lamp of frequency.
In order to achieve the above objectives, the invention provides the following technical scheme: a kind of be based on mains frequency time-controlled Christmas
Switching Power Supply needed for lamp, including power supply control chip, the power supply control chip and transformer and peripheral circuit are constituted, the change
Depressor includes the secondary coil of the primary coil of primary side, ancillary coil and primary side, and the power supply control chip is arranged in institute
It states transformer primary and is connect with the primary coil, ancillary coil, which is characterized in that further include being arranged in the transformer
The alternating current sampling circuit of primary side, periodically with control circuit, voltage commutation circuit, RC delay circuit and with the transformer secondary output
The Christmans light string of side connection, the power supply control chip are connect with the primary coil, ancillary coil and voltage commutation circuit, institute
State the first end and access power grid input terminal of alternating current sampling circuit, second end and the timing and control electricity of the alternating current sampling circuit
The first end on road connects, and the timing is connect with the second end of control circuit with the voltage commutation circuit, the voltage switching
Circuit is connect with the RC delay circuit.
Further, the voltage commutation circuit includes voltage control switching circuit, 3rd resistor and first switch, described
The first end of 3rd resistor is connect with the power supply control chip, the second end of the 3rd resistor and the first end of first switch
Connection, the second end ground connection of the 3rd resistor, the power supply control switching circuit pass through the RC delay circuit and described the
The control terminal connection of one switch.
Further, the RC delay circuit includes the 4th resistance, the 5th resistance and the 4th capacitor, the 4th resistance
First end connect with the voltage control switching circuit, the first end of the second end of the 4th resistance and the 5th resistance,
The first end of 4th capacitor connects, the second end ground connection of the 4th capacitor, the second end of the 5th resistance with it is described
The control terminal of first switch connects.
Further, the Switching Power Supply includes at least two for controlling the switch output electricity of primary side Christmans light string
Pressure.
Further, described at least two for controlling the switching output voltage of primary side Christmans light string specifically:
When the voltage of Switching Power Supply output is high output voltage, the high output voltage is greater than the Christmans light string
Cut-in voltage and be less than or equal to the Christmans light string voltage rating when, the Christmans light string is lighted；
The voltage control switching circuit controls the power supply control chip and switches voltage, so that the Switching Power Supply exports
Voltage be low output voltage when, the low output voltage be less than the Christmans light string cut-in voltage when, the Christmans light string
Extinguish.
Further, the high output voltage is slowly converted into described low defeated by the delays time to control of the RC delay circuit
Voltage out.
Further, the ratio of the high output voltage and the low output voltage is equal to or more than 1.35 times.
Further, the alternating current sampling circuit adapts to 50Hz and/or 60Hz according to the frequency parameter of the power grid automatically
Power grid environment.
Further, the alternating current sampling circuit accesses power grid input terminal and by Sample AC mains frequency information with reality
Existing timing and the timing controlled.
Further, it is 24 hours that the Christmans light string, which is lighted and extinguishes timing cycle, and lighting timing is n hours, is extinguished
Timing is 24-n hours.
The beneficial effects of the present invention are: it is of the invention to be exchanged based on the time-controlled Christmas lamp of mains frequency by being added
Sample circuit simultaneously counts mains frequency, realizes and controls the exact timing of Christmas lamp, to achieve the purpose that reduce cost；
Switching Power Supply based on the time-controlled Christmas lamp of mains frequency of the invention includes at least two output voltages, and
It is matched with voltage control switching circuit, realizes that the light on and off to Christmas lamp control by switching output voltage height, to reach
System stabilization and purpose convenient to use.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention and the accompanying drawings.
Detailed description of the invention
Fig. 1 is the circuit diagram of the timing Christmas lamp of the prior art.
Fig. 2 is circuit diagram of the invention.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
Fig. 2 is referred to, is provided in a preferred embodiment of the invention a kind of based on mains frequency time-controlled Christmas
Lamp, the Christmas lamp access single-phase alternating current.It is described to be based on the time-controlled Christmas lamp of mains frequency to include including that power supply controls
Switching Power Supply needed for chip, power supply control chip and transformer T1 and peripheral circuit are constituted, the transformer T1 includes primary side
Primary coil, ancillary coil and primary side secondary coil, the power supply control chip setting is primary in the transformer T1
Side is simultaneously connect with the primary coil, ancillary coil, and the Switching Power Supply is PSR AC/DC Switching Power Supply.It is described to be based on power grid
The time-controlled Christmas lamp of frequency further include the alternating current sampling circuit that the transformer T1 primary side is set, periodically with control electricity
Road, voltage commutation circuit, RC delay circuit and the Christmans light string being connect with the transformer T1 primary side.In the present embodiment,
The Christmans light string is LED (LightEmitting Diode, light emitting diode) lamp string, in other embodiments, the Christmas
Lamp string can also be other, according to the actual situation depending on, it is not limited here.The power supply control chip and the primary coil,
Ancillary coil and voltage commutation circuit connection, the first end and access power grid input terminal of the alternating current sampling circuit, the exchange
The second end of sample circuit is connect with timing with the first end of control circuit, the second end of the timing and control circuit with it is described
Voltage commutation circuit connection, the voltage commutation circuit are connect with the RC delay circuit.
The voltage commutation circuit includes voltage control switching circuit, 3rd resistor R3 and first switch K1, the third
The first end of resistance R3 is connect with the power supply control chip, the second end of the 3rd resistor R3 and the first of first switch K1
End connection, the second end ground connection of the 3rd resistor R3, the power supply control switching circuit pass through the RC delay circuit and institute
State the control terminal connection of first switch K1.The ancillary coil accesses 3rd resistor R3 and first switch K1, the ancillary coil
Also access first resistor R1, second resistance R2 and the second capacitor C2, the first end of the first resistor R1 and second capacitor
The first end of C2 connects and accesses the ancillary coil, the second end of the second resistance R2 and the first of the second resistance R2
End connection, the second end of the second resistance R2 access the secondary coil and are grounded, the second termination of the second capacitor C2
Ground.The primary side primary coil has also accessed first diode D1 and first capacitor C1, and the first of the first diode D1
It terminates into AC line, the second end of the first diode D1 is connect with the first end of the first capacitor C1, first electricity
Hold the second end ground connection of C1.Really, in other embodiments, the first diode D1 can also be replaced with bridge rectifier,
It is not limited here.In the present embodiment, the power supply control chip is single-chip microcontroller.Really, in other embodiments, the electricity
Source control chip can also be other, according to the actual situation depending on.
The Switching Power Supply includes at least two for controlling the switching output voltage of secondary side Christmas lamp.Described at least two
Plant the switching output voltage for controlling secondary side Christmas lamp specifically:
When the voltage of Switching Power Supply output is high output voltage, the high output voltage is greater than the Christmans light string
Cut-in voltage and be less than or equal to the Christmans light string voltage rating when, the Christmans light string is lighted；
The voltage control switching circuit controls the power supply control chip and switches voltage, so that the Switching Power Supply exports
Voltage be low output voltage when, the low output voltage be less than the Christmans light string cut-in voltage when, the Christmans light string
Extinguish.The type of the output voltage is greater than or equal to two kinds.In the present embodiment, the type of the output voltage is two kinds,
Really, in other embodiments, the type of the output voltage can also for three kinds or four kinds and other, according to the actual situation and
It is fixed.
It is worth noting that needing to slow down the adjustment speed to output voltage when voltage control switching circuit works, otherwise will
Cause system to enter overvoltage protection state when exporting high pressure and being switched to low pressure, causes system unstable.In the present embodiment, originally
Slowly conversion of the control output voltage from high pressure to low pressure is realized in invention using a delay circuit, realizes that system is stablized.Institute
State based on the time-controlled Christmas lamp of mains frequency further include for control the high output voltage be slowly converted into it is described low defeated
The delay circuit of voltage out, the delay circuit include the 4th resistance R4, the 5th resistance R5 and the 4th capacitor C4, the 4th electricity
The first end of resistance R4 connect with the voltage control switching circuit, the second end of the 4th resistance R4 and the 5th resistance R5
First end, the first end of the 4th capacitor C4 connection, the 4th capacitor C4 second end ground connection, the 5th resistance R5
Second end connect with the control terminal of the first switch K1.
The ratio of the high output voltage and the low output voltage is equal to or more than 1.35 times, when the high output voltage
When being greater than or equal to 1.35 times with the ratio of the low output voltage, stable electric current can be provided for Christmans light string.Work as Christmas lamp
When string is LED light string, LED light string is used widely in Christmas lamp as a kind of cold light source, compared to glow bulb energy conservation
Up to 75%.It will start to light when the voltage of application reaches the cut-in voltage of LED light string, as the increase electric current of voltage is fast
Speed increases, and until reaching specified electric current, as a kind of semiconductor load characteristic, small voltage change will lead to LED light
The large change of string electric current, therefore power supply needs to provide current control function, and stable operating current is provided for LED light string.Example
The only about 2.5V as a rated operational voltage is its cut-in voltage of the LED light string of 3.3V is respectively greater than LED light using two
The output of total cut-in voltage of going here and there carrys out lightening LED lamp string, keeps LED light string to be in using the voltage lower than LED light string and puts out
It goes out state, and realizes that the time switch of lamp string controls by timing mode, such as when timing starts reaches the output voltage of circuit
Operating voltage to LED light string lights it normally, after timing by turn down output voltage to LED light string cut-in voltage
Make its extinguishing below, realizes light on and off control.
The alternating current sampling circuit accesses power grid input terminal, because described connect based on the time-controlled Christmas lamp of mains frequency
Enter single-phase alternating current, the characteristic based on AC network, mains frequency is relatively accurate value, and typical accuracy is better than 2%, long-term essence
Degree even better than 0.1%, alternating current sampling circuit of the invention is located at grid side, so as to conveniently by Sample AC power grid
Frequency information realize timing, to reduce the use of crystal oscillator, reduce circuit cost.The alternating current sampling circuit is according to the electricity
The frequency parameter of net adapts to 50Hz and/or 60Hz power grid environment automatically, and the alternating current sampling circuit accesses power grid input terminal and leads to
Over-sampling AC network frequency information is to realize timing and the timing controlled.
The ancillary coil of the primary side also accesses the second diode D2, the second diode D2 and second capacitor
The first end of C2 connects, described to further include and the secondary coil of primary side company based on the time-controlled Christmas lamp of mains frequency
The third diode D3 and third capacitor C3, the first end of the third capacitor C3 connect is connect simultaneously with the third diode D3
Power supply is accessed, the second end ground connection of third capacitor C3, one end of the Christmans light string is also grounded.The Christmans light string is lighted and is put out
The timing cycle that goes out is 24 hours, and lighting timing is n hours, and extinguishing timing is 24-n hours.For example, timing can be set as every time
Unlatching is lighted 6 hours, is then extinguished 18 hours, is recycled within every 24 hours；Alternatively, timing can be set as opening every time, to light 8 small
When, then extinguish 16 hours, every 24 hours recycle, setting time according to the actual situation depending on, it is not limited here.
Certainly, in other embodiments, a key can also be set up in circuit to be used as function selection, thus real
Existing timing controlled is always on, the often functions such as pass setting；An additional indicator light can also be used, timing function is used to refer to
State；In other embodiments, of the invention to be integrated in one based on the time-controlled Christmas circuit for lamp of mains frequency
In single IC chip, to simplify circuit system structure, system cost is further decreased.Above all according to practical feelings
Depending on condition, it is not limited here.
In summary: it is of the invention based on the time-controlled Christmas lamp of mains frequency by the way that alternating current sampling circuit and right is added
Mains frequency counts, and realizes and controls the exact timing of Christmas lamp, to achieve the purpose that reduce cost；
Switching Power Supply based on the time-controlled Christmas lamp of mains frequency of the invention includes at least two output voltages, and
It is matched with voltage control switching circuit, realizes that the light on and off to Christmas lamp control by switching output voltage height, to reach
System stabilization and purpose convenient to use.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. one kind is based on the time-controlled Christmas lamp of mains frequency, including power supply control chip, the power supply control chip and change
Switching Power Supply needed for depressor and peripheral circuit are constituted, the transformer includes the primary coil, ancillary coil and secondary of primary side
The secondary coil of side, power supply control chip setting the transformer primary and with the primary coil, ancillary coil
Connection, which is characterized in that further include the alternating current sampling circuit that the transformer primary is set, periodically with control circuit, electricity
Press switching circuit, RC delay circuit and the Christmans light string connecting with the transformer secondary, the power supply control chip and institute
State primary coil, ancillary coil and voltage commutation circuit connection, the first end and access power grid input of the alternating current sampling circuit
The second end at end, the alternating current sampling circuit is connect with timing with the first end of control circuit, the timing and control circuit
Second end is connect with the voltage commutation circuit, and the voltage commutation circuit is connect with the RC delay circuit.
2. being based on the time-controlled Christmas lamp of mains frequency as described in claim 1, which is characterized in that the voltage switching electricity
Road includes voltage control switching circuit, 3rd resistor and first switch, and the first end of the 3rd resistor and the power supply control
Chip connection, the second end of the 3rd resistor and the first end of first switch connect, the second end ground connection of the 3rd resistor,
The power supply control switching circuit is connect by the RC delay circuit with the control terminal of the first switch.
3. being based on the time-controlled Christmas lamp of mains frequency as claimed in claim 2, which is characterized in that the RC delay circuit
Including the 4th resistance, the 5th resistance and the 4th capacitor, the first end of the 4th resistance and the voltage control switching circuit connect
Connect, the second end of the 4th resistance is connect with the first end of the 5th resistance, the first end of the 4th capacitor, described
The second end of four capacitors is grounded, and the second end of the 5th resistance is connect with the control terminal of the first switch.
4. being based on the time-controlled Christmas lamp of mains frequency as described in claim 1, which is characterized in that the Switching Power Supply packet
At least two are included for controlling the switching output voltage of primary side Christmans light string.
5. being based on the time-controlled Christmas lamp of mains frequency as claimed in claim 4, which is characterized in that described at least two use
In the switching output voltage of control primary side Christmans light string specifically:
When the voltage of Switching Power Supply output is high output voltage, the high output voltage is greater than opening for the Christmans light string
When opening voltage and being less than or equal to the voltage rating of the Christmans light string, the Christmans light string is lighted；
The voltage control switching circuit controls the power supply control chip and switches voltage, so that the electricity of Switching Power Supply output
When pressure is low output voltage, when the low output voltage is less than the cut-in voltage of the Christmans light string, the Christmans light string extinguishes.
6. being based on the time-controlled Christmas lamp of mains frequency as claimed in claim 5, which is characterized in that the high output voltage
The low output voltage is slowly converted by the delays time to control of the RC delay circuit.
7. being based on the time-controlled Christmas lamp of mains frequency as claimed in claim 6, which is characterized in that the high output voltage
It is equal to or more than 1.35 times with the ratio of the low output voltage.
8. being based on the time-controlled Christmas lamp of mains frequency as described in claim 1, which is characterized in that the AC sampling electricity
Road adapts to 50Hz and/or 60Hz power grid environment according to the frequency parameter of the power grid automatically.
9. being based on the time-controlled Christmas lamp of mains frequency as described in claim 1, which is characterized in that the AC sampling electricity
Power grid input terminal is accessed and by Sample AC mains frequency information to realize timing and the timing controlled in road.
10. being based on the time-controlled Christmas lamp of mains frequency as claimed in claim 9, which is characterized in that the Christmans light string
Lighting and extinguishing timing cycle is 24 hours, and lighting timing is n hours, and extinguishing timing is 24-n hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811197576.6A CN109287032A (en) | 2018-10-15 | 2018-10-15 | Based on the time-controlled Christmas lamp of mains frequency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811197576.6A CN109287032A (en) | 2018-10-15 | 2018-10-15 | Based on the time-controlled Christmas lamp of mains frequency |
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| Publication Number | Publication Date |
|---|---|
| CN109287032A true CN109287032A (en) | 2019-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811197576.6A Pending CN109287032A (en) | 2018-10-15 | 2018-10-15 | Based on the time-controlled Christmas lamp of mains frequency |
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Cited By (1)
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| CN110191549A (en) * | 2019-07-04 | 2019-08-30 | 浙江阳光美加照明有限公司 | A kind of accurate time switch lamp of LED and its driving circuit of accurate timing |
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| WO2021000433A1 (en) * | 2019-07-04 | 2021-01-07 | 浙江阳光美加照明有限公司 | Precise timing switch led lamp, and precise timing drive circuit for same |
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