CN201518518U - Digital satellite television receiver set-top box polarization voltage control circuit - Google Patents
Digital satellite television receiver set-top box polarization voltage control circuit Download PDFInfo
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- CN201518518U CN201518518U CN2009201834058U CN200920183405U CN201518518U CN 201518518 U CN201518518 U CN 201518518U CN 2009201834058 U CN2009201834058 U CN 2009201834058U CN 200920183405 U CN200920183405 U CN 200920183405U CN 201518518 U CN201518518 U CN 201518518U
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Abstract
A digital satellite television receiver set-top box polarization voltage control circuit is provided, wherein a power supply end of a power supply module is connected with the anode of a diode D6, one end of a resistance R 20 is connected with an emitting electrode of a triode Q7, the diode D6, a diode D7 and a diode D8 are connected in series, the collector of a triode Q7 is connected with a cathode of the diode D8, the other end of the resistance R20 is connected with the collector of a triode Q13 through a resistance R21, the emitter of the triode Q13 is grounded, 13/18V voltage control signals are connected to the base electrode of the triode Q13, the cathode of the diode D8 is connected with an anode of a diode D5, a triode Q9 strides over the two ends of the diode D5, the cathode of the diode D5 is connected with a power supply end of a high frequency head through a restorable fuse, the base electrode of the triode Q9 is connected with the collector of a triode Q14, the emitter of the triode Q14 is grounded, and 22K switch signals or Diseqc control signals are connected with the base electrode of the triode Q14. The digital satellite television receiver set-top box polarization voltage control circuit has advantages of simple circuit structure, low cost and convenient debugging, can normatively output LNB polarization voltage and 22K or Diseqc signals.
Description
[technical field]
The utility model is about the circuit in a kind of digital satellite television receiver top box, particularly index word satellite television receiver top box polarizing voltage control circuit.
[background technology]
In satellite television receiving system, an outdoor receiving element of satellite television is arranged, be called tuner again, be installed in after the feed of outdoor satellite earth antenna.Its inside mainly comprises Microwave Low-Noise amplification and microwave down-conversion two large divisions, so be also referred to as low noise down-conversion assembly, english abbreviation is LNB (Low NoiseBlock).
The main effect of tuner is that the descending faint electromagnetic wave signal that antenna receives is amplified, and it is transformed into frequency is 950～1450MHz (or 1750MHz, reach as high as 2150MHz) first intermediate-freuqncy signal, so that, give the demodulation that indoor satellite television receiver carries out TV signal with it by radio frequency cable.
The input of the front end tuner in the digital satellite television receiver also will provide control signal to satellite earth antenna, tuner (LNB) and antenna controller by its realization except reception comes from first intermediate-freuqncy signal of tuner (LNB).Control signal comprises 13/18V control voltage (being used for controlling level/vertical electric wave polarised direction), 22k switching signal (being used for the switching of the two local frequencies of LNB or the switching of alternative antenna controller), Diseqc control signal (control signals of many antenna controllers of European standard) etc., and these control signals finally will be carried out Combination Design by a polarizing voltage control device and could be realized and the transmission simultaneously on cable of first intermediate-freuqncy signal.
The following two kinds of designs of the general employing of the polarization control circuit of ordinary numbers satellite television receiver at present:
1) as shown in Figure 1, by power supply output two-way direct voltage 14V and 19V, 14V directly connects the power end of LNB by 2 diodes, 19V receives the power end of LNB after by a switching circuit again, two I/O mouths generation control signals by CPU are selected, 13/18V control voltage represents with H/V that in the drawings the shortcoming of this circuit is that power supply need additionally provide the output of one road direct voltage, thereby increases cost.
2) as shown in Figure 2, power supply only uses one the tunnel, but need be used elements such as the variable integrated three-terminal regulator LM317 of output voltage and peripheral some Resistor-Capacitor Units and triode forms control circuit and realizes polarization control, its shortcoming is: do not consider phase problem and waveform modification problem, 22K can appear or the Diseqc waveform is lack of standardization, in vertical and horizontal polarization voltage problems such as 22K or Diseqc amplitude be inconsistent simultaneously not, and integrated three-terminal regulator LM317 need use bigger fin, makes that this scheme cost is higher.
In view of above problem, how designing a ideal and lower-cost polarization control circuit is the prior art personnel technical issues that need to address.
[utility model content]
Technical problem to be solved in the utility model is to provide a kind of simple in structure, digital satellite television receiver top box polarizing voltage control circuit that cost is low.
The utility model solves the problems of the technologies described above by the following technical programs: a kind of digital satellite television receiver top box polarizing voltage control circuit, form by two parts circuit, first's circuit is that 13/18V voltage produces and control circuit, and the second portion circuit is the be added to control circuit of 13/18V tuner voltage of 22K switching signal or Diseqc control signal;
Described first circuit comprises diode D6, D7, D8, triode Q7, Q13, and resistance R 20, R21, R22, the power module feeder ear is connected to the anode of diode D6 simultaneously, one end of resistance R 20 and the emitter of triode Q7, the anode of diode D7 connects the negative electrode of diode D6, the anode of diode D8 connects the negative electrode of diode D7, the negative electrode of diode D8 is received the input of second portion circuit, the collector electrode of triode Q7 is connected the negative electrode of diode D8, the other end of resistance R 20 is connected to the collector electrode of triode Q13 by resistance R 21, the base stage of triode Q13 is received in triode Q13 grounded emitter, 13/18V voltage control signal by resistance R 22;
Described second portion circuit comprises diode D5, triode Q9, Q14, resistance R 23, R24, and can recover fuse F5, the negative electrode of diode D8 is connected to the anode of diode D5 and the emitter of triode Q9, the collector electrode of triode Q9 is connected to the negative electrode of diode D5, the negative electrode of diode D5 is by recovering the power end that fuse F5 is connected to tuner, the base stage of triode Q9 is connected to the collector electrode of triode Q14 by resistance R 23, the grounded emitter of triode Q14,22K switching signal or Diseqc control signal are connected to the base stage of triode Q14 by resistance R 24.
It is the diode of R1200 that described diode D6, D7, D8 adopt model.
Diode D5 adopts 1N4007.
The advantage of the utility model digital satellite television receiver top box polarizing voltage control circuit is: circuit structure is simple, with low cost, debugging is convenient, output LNB polarizing voltage and 22K or Diseqc signal that can standard, there are not vertical and horizontal voltage not 22K or the inconsistent problem of Diseqc signal amplitude simultaneously, local oscillator switching device shifter on can compatible market in the 22K of the overwhelming majority or Diseqc switch and the outdoor tuner improves the degree of recognition of client to this receiver product.
[description of drawings]
The utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the schematic diagram of existing a kind of digital satellite television receiver top box polarizing voltage control circuit.
Fig. 2 is the schematic diagram of existing another kind of digital satellite television receiver top box polarizing voltage control circuit.
Fig. 3 is the schematic diagram of the utility model digital satellite television receiver top box polarizing voltage control circuit.
[embodiment]
See also shown in Figure 3, the utility model digital satellite television receiver top box polarizing voltage control circuit is made up of two parts, first's circuit is that 13/18V voltage produces and control circuit, and the second portion circuit is the be added to control circuit of 13/18V tuner (LNB) voltage of 22K switching signal or Diseqc control signal.
Described first circuit comprises diode D6, D7, D8, triode Q7, Q13, and resistance R 20, R21, R22.
The power module feeder ear is connected to the anode of diode D6 simultaneously, one end of resistance R 20 and the emitter of triode Q7, the anode of diode D7 connects the negative electrode of diode D6, the anode of diode D8 connects the negative electrode of diode D7, the negative electrode of diode D8 is received the input of second portion circuit, the collector electrode of triode Q7 is connected the negative electrode of diode D8, and triode Q7 is used for the horizontal voltage 18V of generation.The other end of resistance R 20 is connected to the collector electrode of triode Q13 by resistance R 21, triode Q13 grounded emitter, and the 13/18V voltage control signal is received the base stage of triode Q13 by resistance R 22.
Described second portion circuit comprises diode D5, triode Q9, Q14, resistance R 23, R24 and can recover fuse F5.
The anode tap of the diode D6 of described first circuit is represented with the A point in Fig. 3, the cathode terminal of diode D8 is represented with the B point in Fig. 3, the negative electrode of diode D8 is connected to the anode of diode D5 of second portion circuit and the emitter of triode Q9, the cathode terminal of diode D5 is represented with the C point in Fig. 3, the collector electrode of triode Q9 is connected to the negative electrode of diode D5, the power end (LNB POWER) that the negative electrode of diode D5 is connected to tuner by recovering fuse F5, the base stage of triode Q9 is connected to the collector electrode of triode Q14 by resistance R 23, the grounded emitter of triode Q14,22K switching signal or Diseqc control signal are connected to the base stage of triode Q14, the 22K switching signal of only drawing among Fig. 3 by resistance R 24.This second portion circuit is by diode D5, triode Q9, resistance R 23, R24, and the acting in conjunction of triode Q14, and 22K switching signal or the Diseqc control signal 13/18V voltage that is added to is produced and control circuit.
The operation principle of digital satellite television receiver top box polarizing voltage control circuit is as described below:
The power module feeder ear provides the voltage of 19V, what send here as CPU is that horizontal polarization control is when requiring, this I/O mouth is a high level, be that 13/18V voltage control signal end is a high level, because resistance R 20, R21 provides bias voltage for triode Q13, triode Q13 enters saturation condition, triode Q13 collector electrode is dragged down, triode Q7 enters the saturation conduction state, the B point voltage is 18.8V, when 22K switching signal end does not have signal, behind the B point voltage process diode D5, the LNB POWER voltage of Chan Shenging is 18.8-0.7V=18.1V at last, satisfies horizontal polarization voltage voltage range and requires that (the standard-required scope is 17.3V～19V).Because in the present embodiment, the model that diode D5 adopts is 1N4007, so the pressure drop of diode D5 is 0.7V.
What send here as CPU is that perpendicular polarization control is when requiring, this I/O mouth is a low level, because resistance R 20, R21 provides bias voltage for triode Q13, triode Q13 enters cut-off state, triode Q7 base stage is drawn high, triode Q7 enters cut-off state, in the present embodiment, diode D6, D7, D8 all adopts the diode of R1200 model, because the diode inside of R1200 model comprises two PN junctions, each diode drop is 1.4V, so the B point voltage is 19V-1.4 * 3=13.8V, when 22K switching signal end does not have signal, behind the B point voltage process diode D5, the LNB POWER voltage of Chan Shenging is 13.8-0.7V=13.1V at last, satisfies perpendicular polarization voltage voltage range and requires that (the standard-required scope is 12.6V～14V).
Because 22K switching signal or Diseqc control signal are made up of the square wave that height changes, frequency is not high, can be applicable to this circuit, when the 22K switching signal was high level, triode Q14 entered the conducting saturation condition, and triode Q9 also enters the conducting saturation condition, diode D5 is by bypass, voltage that C is ordered and B point voltage are approaching, and when polarization was controlled to be level, the C point voltage was 18.8V; When the 22K switching signal is low level, triode Q14 enters cut-off state, triode Q9 also enters cut-off state, diode D5 is not by bypass, the two ends pressure drop is 0.7V, the voltage ratio B point voltage that C is ordered hangs down 0.7V, when polarization is controlled to be level, the C point voltage is 18.8-0.7=18.1V, can see that at last in the LNB POWER 22K of place switching signal or Diseqc control signal be directly to be superimposed upon on the 13/18V LNB voltage, and the amplitude of 22K switching signal or Diseqc control signal is the same during 13/18V, and design result adheres to specification.
In this circuit design, it is the diode of R1200 that diode D6, D7, D8 adopt cheap model, and its inside comprises two PN junctions, and rated current can reach 500mA, and the forward peak current can reach 30A, and forward pressure reduction is 1.4V; Diode D5 adopts 1N4007, and its rated current is 1A, and the forward peak current can reach 30A, and forward pressure reduction is 0.7V; Triode Q7 and Q9 adopt SS8550, the maximum collector current of its nominal is 1.5A, maximum diffipation power is 1W, because LNB POWER running current is 200-300mA, when outdoor tuner or cable are short-circuited, carry out current limliting owing to have use can recover fuse F5 in the circuit, when electric current surpasses 600mA, can recover fuse F5 automatic disconnection, after short circuit is removed, can recover fuse F5 and connect automatically again and power, the current design of the used element of visible whole LNB POWER path is reasonably, can satisfy application request fully, the reliability of system can be guaranteed, remaining other element design parameters are: resistance R 20, R22, R23, the R24 parameter is 4.7K, 0603, and 0.1W; Resistance R 21 parameters are 1.5K, 1206, and 0.25W; Triode Q13 and Q14 adopt the common triode of 2SC1815, and can recover fuse F5 parameter is withstand voltage 60V, rated current 300mA.
Claims (3)
1. digital satellite television receiver top box polarizing voltage control circuit, it is characterized in that: form by two parts circuit, first's circuit is that 13/18V voltage produces and control circuit, and the second portion circuit is the be added to control circuit of 13/18V tuner voltage of 22K switching signal or Diseqc control signal;
Described first circuit comprises diode D6, D7, D8, triode Q7, Q13, and resistance R 20, R21, R22, the power module feeder ear is connected to the anode of diode D6 simultaneously, one end of resistance R 20 and the emitter of triode Q7, the anode of diode D7 connects the negative electrode of diode D6, the anode of diode D8 connects the negative electrode of diode D7, the negative electrode of diode D8 is received the input of second portion circuit, the collector electrode of triode Q7 is connected the negative electrode of diode D8, the other end of resistance R 20 is connected to the collector electrode of triode Q13 by resistance R 21, the base stage of triode Q13 is received in triode Q13 grounded emitter, 13/18V voltage control signal by resistance R 22;
Described second portion circuit comprises diode D5, triode Q9, Q14, resistance R 23, R24, and can recover fuse F5, the negative electrode of diode D8 is connected to the anode of diode D5 and the emitter of triode Q9, the collector electrode of triode Q9 is connected to the negative electrode of diode D5, the negative electrode of diode D5 is by recovering the power end that fuse F5 is connected to tuner, the base stage of triode Q9 is connected to the collector electrode of triode Q14 by resistance R 23, the grounded emitter of triode Q14,22K switching signal or Diseqc control signal are connected to the base stage of triode Q14 by resistance R 24.
2. digital satellite television receiver top box polarizing voltage control circuit as claimed in claim 1 is characterized in that: it is the diode of R1200 that described diode D6, D7, D8 adopt model.
3. digital satellite television receiver top box polarizing voltage control circuit as claimed in claim 1, it is characterized in that: diode D5 adopts 1N4007.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201834058U CN201518518U (en) | 2009-10-22 | 2009-10-22 | Digital satellite television receiver set-top box polarization voltage control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201834058U CN201518518U (en) | 2009-10-22 | 2009-10-22 | Digital satellite television receiver set-top box polarization voltage control circuit |
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| Publication Number | Publication Date |
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| CN201518518U true CN201518518U (en) | 2010-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009201834058U Expired - Fee Related CN201518518U (en) | 2009-10-22 | 2009-10-22 | Digital satellite television receiver set-top box polarization voltage control circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104254008A (en) * | 2014-09-16 | 2014-12-31 | 深圳市九洲电器有限公司 | LNB loop polarization voltage switching control circuit and device |
| CN105657411A (en) * | 2014-12-02 | 2016-06-08 | 深圳Tcl数字技术有限公司 | TV and TV feed detection method |
-
2009
- 2009-10-22 CN CN2009201834058U patent/CN201518518U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104254008A (en) * | 2014-09-16 | 2014-12-31 | 深圳市九洲电器有限公司 | LNB loop polarization voltage switching control circuit and device |
| CN104254008B (en) * | 2014-09-16 | 2017-11-07 | 深圳市九洲电器有限公司 | A kind of LNB rings wear polarizing voltage control switching circuit and device |
| CN105657411A (en) * | 2014-12-02 | 2016-06-08 | 深圳Tcl数字技术有限公司 | TV and TV feed detection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: Mawei Development Zone, Fujian province Fuzhou Ru Jiang Road 350000, No. 70 (Scud Industrial Park) 6 floor and 5 floor two to four Patentee after: Fujian Newland Communication Science Technology Co., Ltd. Address before: 350000 Fuzhou Province, Mawei District, west of the Confucian Road, No. 1 Patentee before: Fujian Newland Communication Science & Technology Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100630 Termination date: 20141022 |
|
| EXPY | Termination of patent right or utility model |