CN102710915A - LNB (Low Noise Block) power supply control circuit - Google Patents
LNB (Low Noise Block) power supply control circuit Download PDFInfo
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Abstract
The invention relates to an LNB (Low Noise Block) power supply control circuit comprising an LNB power switch circuit, a boosted circuit, a square wave control circuit and a voltage conversion control circuit, and also comprising a power switch signal end, a voltage conversion signal end, a square wave signal end, an LNB voltage input end and an LNB voltage output end, wherein the power switch signal end is connected with the input end of the LNB power switch circuit, the output end of the LNB power switch circuit is connected with the input end of the boosted circuit; the voltage conversion signal end is connected with the output end of the voltage conversion control circuit, and the voltage conversion control circuit is connected with the boosted circuit; the square wave control circuit comprises a second diode and a triode, wherein the anode of the second diode is connected with the LNB voltage input end, and the cathode of the second diode is connected with the output end of the boosted circuit; and the triode is connected with the square wave signal end, is used for controlling the conduction or short circuit of the second diode by 22KHZ square wave signals so as to adjust the output voltage of the LNB voltage output end.
Description
Technical field
The present invention relates to digital satellite receiver, more particularly, relate to a kind of LNB power-supplying circuit of digital satellite receiver.
Background technology
Along with the development of digital television techniques, the use of digital satellite receiver more and more widely.In the LNB power-supplying circuit of present digital satellite receiver, generally be to adopt 33v voltage to be transformed into 18V/13V through linear voltage regulator LM317.Do like this that not only efficient is very low, caloric value is very big, need install big fin additional, causes the increase of digital satellite receiver cost.
Summary of the invention
The technical problem that the present invention will solve is, to the above-mentioned defective of prior art, the LNB power-supplying circuit that a kind of cost is low, debug conveniently and have short-circuit protection function is provided.
The technical solution adopted for the present invention to solve the technical problems is:
Construct a kind of LNB power-supplying circuit; Comprise LNB power switch circuit 10, booster circuit, square wave control circuit and voltage transitions control circuit; Also comprise the power switch signal end that whether is used to control to the receiver power supply, be used to control to said receiver provide voltage swing voltage transitions signal end LNB_13/18V, be used to insert square-wave signal end and the LNB voltage input end and the LNB voltage output end of 22KHZ square-wave signal; The input voltage of said LNB voltage input end is less than the output voltage of said LNB voltage output end; Wherein, Said power switch signal end is connected the input of said LNB power switch circuit 10 with said LNB voltage input end, the output of said LNB power switch circuit 10 connects the input of said booster circuit;
Said voltage transitions signal end LNB_13/18V connects the output of said voltage transitions control circuit, and said voltage transitions control circuit is connected with said booster circuit, exports 13V or 18V voltage to control said booster circuit;
Said square wave control circuit comprises second diode, and the positive pole of said second diode connects said LNB voltage output end, and the negative pole of said second diode connects said booster circuit output;
Said square wave control circuit also comprises with said square-wave signal end and being connected, be used for controlling the conducting of said second diode or by short circuit, with the triode combination of the output voltage size of adjusting said LNB voltage output end through said 22KHZ square-wave signal.
LNB power-supplying circuit of the present invention, wherein, said triode combination comprises the 4th triode of NPN type and the 5th triode of positive-negative-positive; Wherein,
The grounded emitter of said the 4th triode, the base stage of said the 4th triode connect said square-wave signal end, and the collector electrode of said the 4th triode connects the base stage of said the 5th triode through the 8th resistance;
The base stage of said the 5th triode connects said LNB voltage output end through the 7th resistance; The collector electrode of said the 5th triode connects the negative pole of said second diode, and the emitter of said the 5th triode connects the anodal and said LNB voltage output end of said second diode.
LNB power-supplying circuit of the present invention, wherein, said LNB power switch circuit 10 comprises first FET of P-channel enhancement type, second triode, first resistance and second resistance of NPN type; Wherein,
The base stage of said second triode connects said power switch signal end, the grounded emitter of said second triode, and the collector electrode of said second triode is connected said LNB voltage input end through said second resistance with the series circuit of said first resistance;
The grid of said first FET is connected between said first resistance and said second resistance, and the source electrode of said first FET connects said LNB voltage input end, and the drain electrode of said first FET connects the input of said booster circuit.
LNB power-supplying circuit of the present invention, wherein, the divider resistance combination that said booster circuit comprises the 3rd resistance, is used to accomplish switch chip, inductance, first diode, second filter capacitor that boosts and is used to export 13V or 18V voltage; Wherein,
The Enable Pin of said switch chip connects the drain electrode of said first FET through said the 3rd resistance; The input of said switch chip connects the drain electrode of said first FET; Said inductance is connected between the input and switching signal end of said switch chip; Said switching signal end connects the positive pole of said first diode, and the negative pole of said first diode connects the positive pole of said second filter capacitor, the minus earth of said second filter capacitor; The feedback end of said switch chip connects said divider resistance combination, is used for providing the voltage of fixed size, the earth terminal ground connection of said switch chip to said divider resistance combination.
LNB power-supplying circuit of the present invention, wherein, said divider resistance combination comprises the 4th resistance, the 5th resistance and the 6th resistance, said voltage transitions control circuit comprises the 3rd triode; Wherein,
The base stage of said the 3rd triode connects said voltage transitions signal end LNB_13/18V, the grounded emitter of said the 3rd triode, and the base stage of said the 3rd triode connects the feedback end of said switch chip through said the 6th resistance;
Said the 5th resistance one end ground connection, said the 5th resistance other end connects the feedback end of said switch chip;
Said the 4th resistance one end connects the feedback end of said switch chip, and said the 4th resistance other end connects the negative pole of said second diode.
LNB power-supplying circuit of the present invention, wherein, the drain electrode of said first FET is also through the first coupling capacitance ground connection.
LNB power-supplying circuit of the present invention, wherein, said LNB power-supplying circuit also comprises short circuit over-current protection circuit, said short circuit over-current protection circuit comprises the 6th triode, the 3rd diode and the 9th resistance of positive-negative-positive; Wherein,
The current collection of said the 6th triode is guard signal end and connect the grid of said first FET very; The base stage of said the 6th triode connects said LNB voltage output end through said the 9th resistance; The emitter of said the 6th triode connects the emitter of said the 5th triode and the positive pole of said the 3rd diode, and the negative pole of said the 3rd diode connects said LNB voltage output end.
LNB power-supplying circuit of the present invention, wherein, said switch chip feedback end provides the fixed voltage size to be 0.6V or 0.9V.
LNB power-supplying circuit of the present invention, wherein, said LNB voltage input end connects 12V voltage.
Beneficial effect of the present invention is: realize the voltage output of 13V or 18V through adopting booster circuit, make and can adopt general 12V voltage to supply power, use convenient; Through adopting the triode combination and realizing cooperating of second diode circuit has been simplified in the adjusting of LNB voltage output end output voltage size, make that the LNB power-supplying circuit is with low cost simultaneously, and realize that simply, debugging is got up convenient.
Description of drawings
To combine accompanying drawing and embodiment that the present invention is described further below, in the accompanying drawing:
Fig. 1 is the LNB power-supplying circuit theory diagram of preferred embodiment of the present invention;
Fig. 2 is the LNB power-supplying circuit detailed schematic diagram of preferred embodiment of the present invention.
Embodiment
The LNB power-supplying circuit theory diagram of preferred embodiment of the present invention is as shown in Figure 1; The LNB power-supplying circuit comprises LNB power switch circuit 10, booster circuit 20, square wave control circuit 30 and voltage transitions control circuit 50; Also comprise the power switch signal end that whether is used to control to the receiver power supply, be used to control to receiver provide voltage swing voltage transitions signal end LNB_13/18V, be used to insert square-wave signal end and the LNB voltage input end and the LNB voltage output end of 22KHZ square-wave signal, the input voltage of LNB voltage input end is less than the output voltage of LNB voltage output end.The power switch signal end is connected the input of LNB power switch circuit 10 with the LNB voltage input end, the output of LNB power switch circuit 10 connects the input of booster circuit 20; Voltage transitions signal end LNB_13/18V connects the output of voltage transitions control circuit 50, and voltage transitions control circuit 50 is connected with booster circuit 20, exports 13V or 18V voltages with control booster circuit 20.
As shown in Figure 2, square wave control circuit 30 comprises the second diode D2, and the positive pole of the second diode D2 connects LNB voltage output end LNB_OUT, and the negative pole of the second diode D2 connects booster circuit 20 outputs.Square wave control circuit 30 also comprises with square-wave signal end 22K and being connected, and is used for controlling the conducting of the second diode D2 or by short circuit through the 22KHZ square-wave signal, with the triode combination of the output voltage size of adjustment LNB voltage output end LNB_OUT.Wherein, LNB voltage input end VCC preferably connects 12V voltage; Receiver is a digital satellite receiver.
The low voltage that inserts from LNB voltage input end VCC obtains 13V or 18V voltage under the control of voltage transitions control circuit 50 after booster circuit 20 boosts, insert the 22KHZ square-wave signal by square-wave signal end 22K again; Make up the conducting of adjusting the second diode D2 or by short circuit by the triode of 22KHZ square-wave signal control square wave control circuit 30; When the second diode D2 conducting, produce the conduction voltage drop of 700mV, and the output of the booster circuit 20 that is added to; As the second diode D2 during by short circuit; Booster circuit 20 output end voltages are constant, thereby adjustment LNB voltage output end LNB_OUT output voltage size produces the 22K AC signal.Owing to adopted booster circuit 20 to realize the voltage output of 13V or 18V, make and can adopt general 12V voltage to supply power, use convenient; Owing to adopted the triode combination and realized the adjusting big or small to LNB voltage output end LNB_OUT output voltage cooperating of the second diode D2, simplified circuit simultaneously, make that the LNB power-supplying circuit is with low cost, and realization has been simple, debugging is got up convenient.
Further, as depicted in figs. 1 and 2 in the foregoing description, the triode combination comprises the 4th triode Q4 and the 5th triode Q5, and the 4th triode Q4 is a NPN type triode, and the 5th triode Q5 is the positive-negative-positive triode.Wherein, the grounded emitter of the 4th triode Q4, the base stage of the 4th triode Q4 connects square wave signal end 22K, and the collector electrode of the 4th triode Q4 connects the base stage of the 5th triode Q5 through the 8th resistance; The base stage of the 5th triode Q5 connects LNB voltage output end LNB_OUT through the 7th resistance R 7; The collector electrode of the 5th triode Q5 connects the negative pole of the second diode D2, and the emitter of the 5th triode Q5 connects positive pole and the LNB voltage output end LNB_OUT of the second diode D2.
Particularly; When the 22KHZ square-wave signal was low level, the 4th triode Q4 base stage was a low level, and the 4th triode Q4 ends; Make that the 5th triode Q5 base stage is identical with emitter voltage; Thereby the 5th triode Q5 ends, the second diode D2 conducting, and the output voltage size of LNB voltage output end LNB_OUT is on the basis of booster circuit 20 output end voltages, to increase by the second diode D2 conduction voltage drop 0.7V; Can obtain booster circuit 20 output end voltages through the concrete component parameter of setting booster circuit 20 is 13.8V/18.7V, and the output voltage size of LNB voltage output end LNB_OUT is 14.5V/19.4V.
When the 22KHZ square-wave signal is high level; The 4th triode Q4 conducting; The 7th resistance R 7 and the 8th resistance form bleeder circuit the 5th triode Q5 base voltage are dragged down, and make the 5th triode Q5 conducting, because the Uces of the 5th triode Q5 equals 0V; Therefore the second diode D2 is made the output voltage of LNB voltage output end LNB_OUT become 13.8V/18.7V by short circuit.
Simultaneously; When the 22KHZ square-wave signal is high level; The 22K AC controling signal can appear in LNB voltage output end LNB_OUT, can draw, and this moment, the output voltage flip-flop of LNB voltage output end LNB_OUT was 14.15V/19.05V; Alternating component is that frequency is that 22KHZ, amplitude are the AC signal of 700mV, and this AC signal is the function of doing the satellite switching commonly used in the LNB electric power system.
Further; In the foregoing description; As depicted in figs. 1 and 2, LNB power switch circuit 10 comprises that the first FET Q1 of NPN type, the second triode Q2, first resistance R 1 and second resistance R, 2, the first FET Q1 of NPN type are preferably the P-channel enhancement type FET.Wherein, the base stage of the second triode Q2 connects power switch signal end LNB_ON/OFF, the grounded emitter of the second triode Q2, and the collector electrode of the second triode Q2 is connected LNB voltage input end VCC through second resistance R 2 with the series circuit of first resistance R 1; The grid of the first FET Q1 is connected between first resistance R 1 and second resistance R 2, and the source electrode of the first FET Q1 connects LNB voltage input end VCC, and the drain electrode of the first FET Q1 connects the input of booster circuit 20.When power switch signal end LNB_ON/OFF was low level, the first FET Q1 ended, the output of LNB power-supplying circuit no-voltage; When power switch signal end LNB_ON/OFF was high level, the second triode Q2 conducting through first resistance R 1 and second resistance R, 2 dividing potential drops, dragged down the grid voltage of the first FET Q1, and the first FET Q1 conducting makes booster circuit 20 power on.
Further; In the foregoing description; Divider resistance combination as depicted in figs. 1 and 2, that booster circuit 20 comprises the 3rd resistance R 3, is used to accomplish switch chip U, inductance L, the first diode D1, the second filter capacitor C2 that boosts and is used to export 13V or 18V voltage.Wherein, The Enable Pin EN of switch chip U connects the drain electrode of the first FET Q1 through the 3rd resistance R 3; The input VIN of switch chip U connects the drain electrode of the first FET Q1, and inductance L is connected between the input VIN and switching signal end LX of switch chip U, and switching signal end LX connects the positive pole of the first diode D1; The negative pole of the first diode D1 connects the positive pole of the second filter capacitor C2; The minus earth of the second filter capacitor C2, the feedback end FB of switch chip U connect the divider resistance combination, are used for making up the voltage that fixed size is provided, the earth terminal GND ground connection of switch chip U to divider resistance.Preferably, the fixed voltage size is 0.6V or 0.9V; The first diode D1 is a rectifier diode, and the second filter capacitor C2 strobes, and is used to export direct current.
Particularly, as shown in Figure 2, the combination of above-mentioned divider resistance comprises the 4th resistance R 4, the 5th resistance R 5 and the 6th resistance R 6, and voltage transitions control circuit 50 comprises the 3rd triode Q3 of NPN type; Wherein, the base stage of the 3rd triode Q3 connects voltage transitions signal end LNB_13/18V, the grounded emitter of the 3rd triode Q3, and the base stage of the 3rd triode Q3 connects the feedback end FB of switch chip U through the 6th resistance R 6; The 5th resistance R 5 one end ground connection, the 5th resistance R 5 other ends connect the feedback end FB of switch chip U; The 4th resistance R 4 one ends connect the feedback end FB of switch chip U, and the 4th resistance R 4 other ends connect the negative pole of the second diode D2.
When voltage transitions signal end LNB_13/18V was low level signal, the 3rd triode Q3 ended, and the second diode D2 cathode voltage is: 0.6* (R755/R757+1)=13.8V; When voltage transitions signal end LNB_13/18V is high level, the 3rd triode Q3 conducting, the 5th resistance R 5 and 6 parallel connections of the 6th resistance R, the second diode D2 cathode voltage is: 0.6* (R755/ (R757R||758)+1)=18.7V.Wherein, the Standard resistance range of the 4th resistance R 4, the 5th resistance R 5 and the 6th resistance R 6 is 1-100 kilo-ohm, and concrete resistance can be selected as required, only needs to satisfy to get final product by the voltage that the aforementioned calculation formula draws 13.8V and 18.7V.
Preferably, as shown in Figure 2 in the foregoing description, the drain electrode of the first FET Q1 is also through the first coupling capacitance C1 ground connection, to increase the stability of a system.Particularly, when the switching signal end LX of switch chip U is dragged down moment, electric current is excessive, causes LNB voltage input end VCC voltage instability easily, and the above-mentioned first coupling capacitance C1 can play cushioning effect.
Further, as depicted in figs. 1 and 2 in the foregoing description, the LNB power-supplying circuit also comprises short circuit over-current protection circuit 40, and short circuit over-current protection circuit 40 comprises the 6th triode Q6, the 3rd diode D3 and the 9th resistance R 9 of positive-negative-positive.Wherein, The current collection of the 6th triode Q6 is guard signal end PROTECTION and connect the grid of the first FET Q1 very; The base stage of the 6th triode Q6 connects LNB voltage output end LNB_OUT through the 9th resistance R 9; The emitter of the 6th triode Q6 connects the emitter of the 5th triode Q5 and the positive pole of the 3rd diode D3, and the negative pole of the 3rd diode D3 connects LNB voltage output end LNB_OUT.
When the LNB power-supplying circuit did not start work, LNB_OUT did not have electric current because of the LNB voltage output end, and the 6th triode Q6 ends, and was equivalent to unsettledly, and short circuit over-current protection circuit 40 is not worked; When the LNB power-supplying circuit is worked, can pass through to set the threshold value of the 9th resistance R 9 resistance size adjustment output currents, and the characteristic of utilizing diode drop to change with output current; When output current surpassed preset threshold, the pressure drop of the 3rd diode D3 was enough big, and the 9th resistance R 9 controls the 6th triode Q6 base current is controlled the 6th triode Q6 conducting; This moment the 6th triode Q6 collector electrode output HIGH voltage; This signal is forced the grid voltage of the first FET Q1 to draw high as the overcurrent protection signal of guard signal end PROTECTION, and the FET Q1 that wins is ended; Thereby cut off the LNB power supply, played overcurrent protection.Simultaneously, also can this guard signal end PROTECTION be connected to the master chip place, when master chip receives this overcurrent protection signal, should in time power switch signal end LNB_ON/OFFLNB_ON/OFF be dragged down, and prompting user output short-circuit information.
To sum up, the present invention realizes the voltage output of 13V or 18V through adopting booster circuit 20, makes and can adopt general 12V voltage to supply power, and uses convenient; Through adopting the triode combination and realizing cooperating of the second diode D2 circuit has been simplified in the adjusting of LNB voltage output end LNB_OUT output voltage size, make that the LNB power-supplying circuit is with low cost simultaneously, and realize that simply, debugging is got up convenient.
In addition, in the further embodiment of the present invention, through short circuit over-current protection circuit 40 is set, the characteristics of utilizing diode drop to change with output current are cut off the LNB power supply when electric current is excessive, play overcurrent protection.
Should be understood that, concerning those of ordinary skills, can improve or conversion, and all these improvement and conversion all should belong to the protection range of accompanying claims of the present invention according to above-mentioned explanation.
Claims (9)
1. LNB power-supplying circuit; Comprise LNB power switch circuit (10), booster circuit (20), square wave control circuit (30) and voltage transitions control circuit (50); Also comprise the power switch signal end that whether is used to control to the receiver power supply, be used to control to said receiver provide voltage swing the voltage transitions signal end, be used to insert square-wave signal end and the LNB voltage input end and the LNB voltage output end of 22KHZ square-wave signal; The input voltage of said LNB voltage input end is less than the output voltage of said LNB voltage output end; It is characterized in that; Said power switch signal end is connected the input of said LNB power switch circuit (10) with said LNB voltage input end, the output of said LNB power switch circuit (10) connects the input of said booster circuit (20);
Said voltage transitions signal end connects the output of said voltage transitions control circuit (50), and said voltage transitions control circuit (50) is connected with said booster circuit (20), exports 13V or 18V voltage to control said booster circuit (20);
Said square wave control circuit (30) comprises second diode (D2), and the positive pole of said second diode (D2) connects said LNB voltage output end, and the negative pole of said second diode (D2) connects said booster circuit (20) output;
Said square wave control circuit (30) also comprises with said square-wave signal end and being connected, be used for controlling the conducting of said second diode (D2) or by short circuit, with the triode combination of the output voltage size of adjusting said LNB voltage output end through said 22KHZ square-wave signal.
2. LNB power-supplying circuit according to claim 1 is characterized in that, said triode combination comprises the 4th triode (Q4) of NPN type and the 5th triode (Q5) of positive-negative-positive; Wherein,
The grounded emitter of said the 4th triode (Q4), the base stage of said the 4th triode (Q4) connects said square-wave signal end, and the collector electrode of said the 4th triode (Q4) connects the base stage of said the 5th triode (Q5) through the 8th resistance (R8);
The base stage of said the 5th triode (Q5) connects said LNB voltage output end through the 7th resistance (R7); The collector electrode of said the 5th triode (Q5) connects the negative pole of said second diode (D2), and the emitter of said the 5th triode (Q5) connects the anodal and said LNB voltage output end of said second diode (D2).
3. LNB power-supplying circuit according to claim 2; It is characterized in that said LNB power switch circuit (10) comprises first FET (Q1) of P-channel enhancement type, second triode (Q2), first resistance (R1) and second resistance (R2) of NPN type; Wherein,
The base stage of said second triode (Q2) connects said power switch signal end; The grounded emitter of said second triode (Q2), the collector electrode of said second triode (Q2) is connected said LNB voltage input end through said second resistance (R2) with the series circuit of said first resistance (R1);
The grid of said first FET (Q1) is connected between said first resistance (R1) and said second resistance (R2); The source electrode of said first FET (Q1) connects said LNB voltage input end, and the drain electrode of said first FET (Q1) connects the input of said booster circuit (20).
4. LNB power-supplying circuit according to claim 3; It is characterized in that the divider resistance combination that said booster circuit (20) comprises the 3rd resistance (R3), is used to accomplish switch chip (U), inductance (L), first diode (D1), second filter capacitor (C2) that boosts and is used to export 13V or 18V voltage; Wherein,
The Enable Pin of said switch chip (U) connects the drain electrode of said first FET (Q1) through said the 3rd resistance (R3); The input of said switch chip (U) connects the drain electrode of said first FET (Q1); Said inductance (L) is connected between the input and switching signal end of said switch chip (U); Said switching signal end connects the positive pole of said first diode (D1); The negative pole of said first diode (D1) connects the positive pole of said second filter capacitor (C2); The minus earth of said second filter capacitor (C2), the feedback end of said switch chip (U) connect said divider resistance combination, are used for providing the voltage of fixed size, the earth terminal ground connection of said switch chip (U) to said divider resistance combination.
5. LNB power-supplying circuit according to claim 4; It is characterized in that; Said divider resistance combination comprises the 4th resistance (R4), the 5th resistance (R5) and the 6th resistance (R6), and said voltage transitions control circuit (50) comprises the 3rd triode (Q3) of NPN type; Wherein,
The base stage of said the 3rd triode (Q3) connects said voltage transitions signal end, the grounded emitter of said the 3rd triode (Q3), and the base stage of said the 3rd triode (Q3) connects the feedback end of said switch chip (U) through said the 6th resistance (R6);
Said the 5th resistance (R5) end ground connection, said the 5th resistance (R5) other end connects the feedback end of said switch chip (U);
Said the 4th resistance (R4) end connects the feedback end of said switch chip (U), and said the 4th resistance (R4) other end connects the negative pole of said second diode (D2).
6. LNB power-supplying circuit according to claim 3 is characterized in that, the drain electrode of said first FET (Q1) is also through first coupling capacitance (C1) ground connection.
7. LNB power-supplying circuit according to claim 3; It is characterized in that; Said LNB power-supplying circuit also comprises short circuit over-current protection circuit (40), and said short circuit over-current protection circuit (40) comprises the 6th triode (Q6), the 3rd diode (D3) and the 9th resistance (R9) of positive-negative-positive; Wherein,
The current collection of said the 6th triode (Q6) is guard signal end and connect the grid of said first FET (Q1) very; The base stage of said the 6th triode (Q6) connects said LNB voltage output end through said the 9th resistance (R9); The emitter of said the 6th triode (Q6) connects the emitter of said the 5th triode (Q5) and the positive pole of said the 3rd diode (D3), and the negative pole of said the 3rd diode (D3) connects said LNB voltage output end.
8. LNB power-supplying circuit according to claim 4 is characterized in that, said switch chip (U) feedback end provides the fixed voltage size to be 0.6V or 0.9V.
9. LNB power-supplying circuit according to claim 1 is characterized in that, said LNB voltage input end connects 12V voltage.
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| CN201986058U (en) * | 2011-01-10 | 2011-09-21 | 青岛海信电器股份有限公司 | LNB power supply circuit and television |
| CN202095020U (en) * | 2011-06-02 | 2011-12-28 | 深圳市视维科技有限公司 | Low noise block (LNB) power supply control circuit of digital television set top box |
| CN102263916A (en) * | 2011-06-07 | 2011-11-30 | 深圳市九洲电器有限公司 | LNB (Low Noise Block) power supply control circuit, power supply control system and digital set-top box |
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| CN103475220B (en) * | 2013-09-23 | 2016-04-06 | 福州福大海矽微电子有限公司 | A kind of LNB power supply and information source control special chip |
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| CN106026716A (en) * | 2016-08-04 | 2016-10-12 | 李连洪 | Water pump voltage control device and system |
| CN111669867A (en) * | 2020-06-22 | 2020-09-15 | 深圳市元征科技股份有限公司 | Key background lamp circuit of vehicle and brightness adjusting method thereof |
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