CN103475220A - Chip special for LNB power source and information source control - Google Patents
Chip special for LNB power source and information source control Download PDFInfo
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- CN103475220A CN103475220A CN2013104346536A CN201310434653A CN103475220A CN 103475220 A CN103475220 A CN 103475220A CN 2013104346536 A CN2013104346536 A CN 2013104346536A CN 201310434653 A CN201310434653 A CN 201310434653A CN 103475220 A CN103475220 A CN 103475220A
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Abstract
The invention relates to a chip special for LNB power source and information source control. The chip special for the LNB power source and information source control is provided with a 1.1MHz DC-DC voltage-increasing module, a reference voltage module, a voltage adjusting module, a 14V/19V voltage switching control module, a 22K waveform generation control module output, an LNB output and protecting unit module and a current detection limitation module; the 1.1MHz DC-DC voltage-increasing module is connected with the reference voltage module; the voltage adjusting module is connected the 14V/19V voltage switching control module; the input end of the LNB output and protecting unit module is connected with the output of the 1.1MHz DC-DC voltage-increasing module, the 22K waveform generation control module output and the output end of the current detection limitation module.
Description
Technical field
The present invention relates to a kind of LNB power supply and information source and control special chip.
Background technology
The front end component that low noise block downconverter (LNB) is satellite television receiving system, the signal noise of its power supply directly affects the receiving sensitivity of system; Along with the increasing year by year of Global Satellite live telecast program source, the reliable switching demand of satellite television information source is day by day strong; Simultaneously, the outdoor unit part due to system, in system Installation and Debugging process and information source antenna inductive load machine operation process, short circuit and load overcurrent state very easily occur, and therefore, short circuit and overcurrent protection are most important.The LNB power supply of traditional satellite television Set Top Box and the form of information source control circuit have multiple, comprise simple discrete component control circuit, LM317 linear power supply control circuit, DC-DC boost control circuit and the professional control circuit that some are emerging.These circuit all exist that circuit complexity, power consumption are large in various degree, the control signal wave distortion, without short-circuit protection function or short-circuit protection function imperfection, high in cost of production shortcoming.Therefore, need to improve this.
Summary of the invention
Task of the present invention is to provide a kind of LNB power supply and information source is controlled special chip, and task of the present invention realizes by following technical solution:
LNB power supply of the present invention is controlled special chip and is provided with 1.1MHz DC-DC boost module, reference voltage module, voltage regulator module, 14V/19V voltage switching controls module, the output of 22K waveform generation control module, LNB output and protected location module, current detecting limiting module; 1.1MHz the DC-DC boost module is connected with the reference voltage module; Between voltage regulator module and 14V/19V voltage switching controls module, be connected; LNB output is connected with the output of 1.1MHz DC-DC boost module, the output of 22K waveform generation control module, current detecting limiting module output with the input of protected location module.
The present invention includes integration packaging in SOP8EP (with the small-sized 8 pin package sheets of ground connection heat dissipation bonding pad) and peripheral pin function definition sequence.
The present invention controls the application actual demand mainly for LNB information source and power supply; in conjunction with the prolonged application experience; introduce high accuracy pulse shaping technique and overcurrent protection algorithm; overcome existing LNB information source and the control signal distortion of power control circuit scheme and the large shortcoming of power supply noise; optimize peripheral circuit simultaneously, realize the complete function output in the case chip of SOP8EP.The present invention is mainly the application characteristic according to us, and deisgn product targetedly, and add some specific functions makes it to become and has our corporate identity, and cost has the product of some superiority.Product design of the present invention has advantages of as follows:
1. active 22K waveform generator is effectively controlled the parameters precision such as frequency, rising edge and trailing edge time, wave-shape amplitude, duty ratio of output waveform, avoids the impact of host computer 22K input signal on above-mentioned parameter; Introduce the sequencing control submodule, realize that the output waveform timing synchronization is in the host computer input signal, meet DiSeqc(Digital Satellite Equipment Control--digital satellite equipment control protocol) the signal sequence demand.
2. perfect protection mechanism:
Output voltage detection type overcurrent and the short-circuit protection circuit of abandoning tradition of the present invention, introduce the real-time detection technique of image current, solves the impact of long cable transmission middle or long line resistance on short-circuit protection circuit; The impact of isolation detection circuit on output parameter simultaneously;
Introduce exclusively, be applicable to the special-purpose short-circuit protection algorithm of controlling application of LNB, realize the LNB short-circuit protection of high efficient and reliable, make circuit application have more specificity.
Detect the multinomial abnormal condition protection measures such as protective circuit, junction temperature detection protective circuit in conjunction with BST circuit and LNB output insulation blocking, inductance magnetic saturation, realize the integrity of defencive function.
3. low noise is controlled: the output voltage low noise control technologys of many combinations, the total output ripple noise that makes system lower than+-40mV, minimize the power-supply system noise influential to LNB low-converter receiving sensitivity.
4. simplify most control interface:
Each input interface built-in level match circuit of chip of the present invention, can the various incoming levels of compatible 1.05V～5V, simultaneously without the external interface element, and minimized peripheral cell.
The SOP8EP encapsulation of simplifying most, further Cost optimization, the pin sequence considers the digital-to-analog circuit isolation of practical application, and adopts single-point type large tracts of land ground connection, improves the ease for use of follow-up machine product PCB design and the reliability of scheme.
The accompanying drawing explanation
Fig. 1 is the scheme block diagram of an embodiment of the present invention;
Fig. 2 is a kind of active 22K waveform generation control module block diagram of the present invention;
Fig. 3 is a kind of LNB output of the present invention and protected location module frame chart;
Fig. 4 is a kind of encapsulation of the present invention and pin ordering chart.
Embodiment
Below in conjunction with the specific embodiment of accompanying drawing, the present invention is further described.(but not being limitation of the present invention).
As shown in Figure 1, be the block diagram of a kind of embodiment of the present invention.As seen from the figure, described chip comprises 1.1MHz DC-DC boost module, reference voltage module, voltage regulator module, 14V/19V voltage switching controls module, 22K waveform generation control module, LNB output and protected location module, current detecting limiting module.Described intermodule annexation: 1.1MHz DC-DC boost module is connected with the reference voltage module; Between voltage regulator module and 14V/19V voltage switching controls module, be connected.LNB output is connected with 1.1MHz DC-DC boost module output, 22K waveform generation control module output, current detecting limiting module output with the input of protected location module.
The present invention completes the boost function of 12V input voltage by the 1.1MHzDC-DC booster circuit, and realize the low noise Voltage-output of high accuracy by reference voltage source, coordinate voltage adjustment and H/V commutation circuit simultaneously, complete required 14V and 19V and control Voltage-output.The DisEqc control signal, by 22K_IN (control signal pin) input, is synchronized with inner 22K waveform generator and completes the high accuracy shapings controls such as wave-shape amplitude, rising edge and trailing edge, duty ratio.Current limiting unit realizes the monitor and detection to the output branch current, and carries out the current limit protection and control, and prevents from, because of the overcurrent of circuit, system is caused to damage.The output of LNB and protected location module integration have high power switching power supply MOSEFT, and integrated temperature detection simultaneously, overload timely checking circuit are realized the more electric circuit inspection protection of complete function.The also simultaneously integrated under-voltage detection of scheme system, prevent the abnormal state detection defencive function in the multinomial practical applications such as inductance magnetic saturation, booster circuit output and the isolation of LNB output current limiting, and realize that with SOP8EP encapsulation and minimum peripheral cell complete LNB controls function.
As Fig. 2 is a kind of active 22K waveform generation control module block diagram of the present invention, described 22K waveform generation control module is provided with the circuit such as 22K frequency generator, the judgement of outside input waveform, amplification shaping control and amplitude detection, the level and smooth control in edge.Annexation between described inside modules circuit: the 22K frequency generator is connected with the Synchronization Control of outside input waveform decision circuitry; The 22K frequency generator is connected with amplification shaping control circuit; The two-way control connection of amplification and rectification circuit and amplitude detection circuit; The two-way control connection of the level and smooth control circuit of amplification and rectification circuit and edge; Amplification shaping control circuit is connected with LNB output and protected location module.
22K control waveform of the present invention is completed by built-in high accuracy frequency generator, and this control signal sequential is inputted the waveform decision circuitry by outside and synchronizeed with the 22K_IN external input signal.The waveform signal that frequency generator produces is sent into and is amplified amplitude and the rising edge trailing edge that shaping control circuit collaborative amplitude detection circuit, the level and smooth control circuit in edge complete waveform and control; and output to LNB output and the protected location module is mixed, complete the output of high-fidelity control signal.
As Fig. 3 is a kind of LNB output of the present invention and protected location module frame chart; LNB output and protected location module are provided with the LNB output unit, junction temperature detects the circuit such as protection, I/O isolation, inductance magnetic saturation detection and image current detection, overcurrent protection algorithm, output voltage detection.Annexation between described inside modules circuit: LNB output unit circuit is connected with the I/O buffer circuit, and the input and output buffer circuit is connected with external boost inductance; LNB output unit circuit is connected with inductance magnetic saturation testing circuit, and the inductance saturable magnetic circuit is connected with external boost inductance; LNB output unit circuit detects protective circuit with junction temperature and is connected; LNB output unit circuit is connected with image current detecting circuit; Image current detecting circuit is connected with overcurrent protection algorithm circuit; Image current detecting circuit is connected with output voltage detecting circuit and output voltage detecting circuit is connected with LNB output unit circuit.
Be used for short-circuit protection method of the present invention (algorithm):
A. when the transient current peak value of testing circuit is greater than 550mA (+-50 mA) threshold values and is greater than 25mS, be judged as overcurrent protection, circuit enters guard mode, otherwise, being judged as normal load transient state overcurrent or interference, circuit is normally exported;
B. output voltage ought be detected lower than 1V, and output current is greater than 550mA (+-50 mA) threshold values, is judged as long line end load short circuits, circuit enters guard mode;
C. after circuit enters protection, regularly attempt active circuit, the ON/OFF of 60mS/1400mS intermittently state is detected, until circuit recovers normal.After realizing that abnormality is withdrawn, the self-recovering function of circuit.
The built-in high-power output mos FET pipe of LNB output unit of the present invention; and introduced the image current detection technique; detect in real time the current status of output loop, in conjunction with overcurrent protection algorithm and output voltage measuring ability module, realize the reliable overcurrent of circuit and short-circuit protection function.
The inspection of l image current: the image current detection technique is the contactless current detection technology that I take charge of independent research, this technology provide contactless current detecting in particular for loop current, and isolate with the output large current load, minimize the impact of output circuit load variations on accuracy of detection, give security for the energy conversion efficiency of low-power consumption output and project alternative simultaneously.The one-step optimization of going forward side by side is exported the quantity of high-power detection means, optimizes the project alternative cost.
The l output voltage detects: when output voltage, lower than certain threshold value, system judges that it is abnormality, and in conjunction with autonomous overcurrent protection algorithm, Circuit tuning guard mode.This functional module has under-voltage protection function concurrently simultaneously, carries out a step and improves defencive function.
L overcurrent protection algorithm: this project, according to the end product scheme research and development application experience of my director's phase, in conjunction with practical application request, is designed a set of effective overcurrent protection algorithm, and specific implementation is as follows:
As Fig. 4 is a kind of SOP8EP pin function definition of the present invention and pin sequence
Pin sequence of the present invention and function are defined as follows:
| Symbol | Sequence number | Describe |
| V_IN | 1 | The power supply input pin |
| REG_C | 2 | Built-in reference voltage decoupling pin: must an external 0.1uF |
| V_OUT | ||
| 3 | The LNB Voltage- | |
| BST | ||
| 4 | The boosting inverter output voltage terminal, also as built-in LDO a reference source | |
| DCS | ||
| 5 | The external inductance pin of DC-DC switch transition | |
| ON/ |
6 | Output voltage Enable Pin: open the LNB Voltage-output during high level; Low level is turn-offed |
| H/V | 7 | H/V voltage selecting side: be output as H=19.3V during high level; Be output as V=14.3V during |
| 22K_IN | ||
| 8 | The input of host computer DiSEqC modulation signal, FD9515, by inner synchronous circuit, produces the control signal of synchronizeing with input timing, and the V_OUT output is added to | |
| |
9 | Chip belly ground pad |
Chip of the present invention adopts digital-to-analogue Mixed Design technology; the digital-to-analogue grounding design of product is completed in the layout design of chip and encapsulated phase simultaneously; adopt SOP8EP to encapsulate own large tracts of land ground connection weld tabs single-point access; and the pin sequence considers the digital-to-analog circuit isolation of practical application; improve the ease for use of machine product PCB design, improve the use consistency of product when reducing chip cost.
Circuit height of the present invention is integrated in the 8 pin case chips of SOP8EP, and, according to practical application request, the sequence of definition pin, be isolated in the digital-to-analogue ground connection of circuit in case chip and complete, and Cost optimization is also simplified circuit PCB designing requirement.
Described pin and outward element annexation:
It is the output switch of circuit that l ON/OFF pin is controlled, and directly connects control interface, without any outward element;
L 22K_IN pin is with reference to the sync waveform input, directly connects control interface, without any outward element;
L H/V pin is 14,19V output switching control inputs, directly connects control interface, without any outward element;
L REG_C is internal reference voltage source decoupling pin, and an external 0.1UF decoupling capacitance is to ground;
L DCS pin is connected with 1.1MHz DC-DC boost module, external boost inductance L1 pin, and be connected to Schottky barrier diodes D1 anode simultaneously;
L BST is connected with the LNB output mos pipe of LNB output and protected location module, external C3 decoupling capacitance, and with the negative terminal of Schottky diode D1, be connected simultaneously;
L V_OUT is circuit voltage and control waveform mixing output, and external C5 carries out decoupling and noise filtering;
L GND is system power supply ground, directly with PCB, systematically is connected, and takes into account heat sinking function simultaneously.
Described chip employing digital-to-analogue mixing LDMOS technology designs, and wherein 14V/19V voltage switching controls module, outside input waveform judge the interface input circuit employing Digital Logic realizations such as synchronous, and other circuit module adopts analog circuit technique to realize.
Be more than specific embodiments of the invention, all similar changes of doing according to above-mentioned design, ought to belong to scope of the present invention.
Claims (4)
1. a LNB power supply is controlled special chip; it is characterized in that, described LNB power supply is controlled special chip and is provided with 1.1MHz DC-DC boost module, reference voltage module, voltage regulator module, 14V/19V voltage switching controls module, the output of 22K waveform generation control module, LNB output and protected location module, current detecting limiting module; 1.1MHz the DC-DC boost module is connected with the reference voltage module; Between voltage regulator module and 14V/19V voltage switching controls module, be connected; LNB output is connected with the output of 1.1MHz DC-DC boost module, the output of 22K waveform generation control module, current detecting limiting module output with the input of protected location module; Described 22K waveform generation control module is provided with 22K frequency generator, the judgement of outside input waveform, amplification shaping control and amplitude detection, the level and smooth control circuit in edge; The 22K frequency generator is connected with the Synchronization Control of outside input waveform decision circuitry; The 22K frequency generator is connected with amplification shaping control circuit; The two-way control connection of amplification and rectification circuit and amplitude detection circuit; The two-way control connection of the level and smooth control circuit of amplification and rectification circuit and edge; Amplifying the shaping control circuit is connected with LNB output and protected location module; Described LNB output and protected location module are provided with LNB output unit, junction temperature detection protection, I/O isolation, inductance magnetic saturation detection and image current detection, overcurrent protection algorithm, output voltage detecting circuit; LNB output unit circuit is connected with the I/O buffer circuit, and the input and output buffer circuit is connected with external boost inductance; LNB output unit circuit is connected with inductance magnetic saturation testing circuit, and the inductance saturable magnetic circuit is connected with external boost inductance; LNB output unit circuit detects protective circuit with junction temperature and is connected; LNB output unit circuit is connected with image current detecting circuit; Image current detecting circuit is connected with overcurrent protection algorithm circuit; Image current detecting circuit is connected with output voltage detecting circuit and output voltage detecting circuit is connected with LNB output unit circuit.
2. control the short-circuit protection method of special chip for LNB power supply claimed in claim 1, it is characterized in that:
A. when the transient current peak value of testing circuit is greater than 550mA (+-50 mA) threshold values and is greater than 25mS, be judged as overcurrent protection, circuit enters guard mode, otherwise, being judged as normal load transient state overcurrent or interference, circuit is normally exported;
B. output voltage ought be detected lower than 1V, and output current is greater than 550mA (+-50 mA) threshold values, is judged as long line end load short circuits, circuit enters guard mode;
C. after circuit enters protection, regularly attempt active circuit, the ON/OFF of 60mS/1400mS intermittently state is detected, until circuit recovers normal, and after realizing that abnormality is withdrawn, the self-recovering function of circuit.
3. LNB power supply according to claim 1 is controlled special chip; it is characterized in that; described circuit height is integrated in the 8 pin case chips of SOP8EP; and according to practical application request; the sequence of definition pin; the digital-to-analogue ground connection of circuit is isolated in case chip and completes, and Cost optimization is also simplified circuit PCB designing requirement; Described pin and outward element annexation:
It is the output switch of circuit that the ON/OFF pin is controlled, and directly connects control interface;
The 22K_IN pin is with reference to the sync waveform input, directly connects control interface;
The H/V pin is 14,19V output switching control inputs, directly connects control interface;
REG_C is internal reference voltage source decoupling pin, and an external 0.1UF decoupling capacitance is to ground;
The DCS pin is connected with 1.1MHz DC-DC boost module, external boost inductance L1 pin, and be connected to Schottky barrier diodes D1 anode simultaneously;
BST is connected with the LNB output mos pipe of LNB output and protected location module, external C3 decoupling capacitance, and with the negative terminal of Schottky diode D1, be connected simultaneously;
V_OUT is circuit voltage and control waveform mixing output, and external C5 carries out decoupling and noise filtering;
GND is system power supply ground, directly with PCB, systematically is connected.
4. LNB power supply according to claim 1 is controlled special chip; it is characterized in that; described chip adopts digital-to-analogue to mix the design of LDMOS technology; wherein 14V/19V voltage switching controls module, outside input waveform judge the interface input circuit employing Digital Logic realizations such as synchronous, and other circuit module adopts analog circuit technique to realize.
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| CN201310434653.6A CN103475220B (en) | 2013-09-23 | 2013-09-23 | A kind of LNB power supply and information source control special chip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310434653.6A CN103475220B (en) | 2013-09-23 | 2013-09-23 | A kind of LNB power supply and information source control special chip |
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| Publication Number | Publication Date |
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| CN103475220A true CN103475220A (en) | 2013-12-25 |
| CN103475220B CN103475220B (en) | 2016-04-06 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617403A (en) * | 2018-12-13 | 2019-04-12 | 珠海迈科智能科技股份有限公司 | A kind of LNB chip |
| WO2020057493A1 (en) * | 2018-09-19 | 2020-03-26 | 青岛海信电器股份有限公司 | Overcurrent protection method and television receiver |
| CN111404596A (en) * | 2020-03-27 | 2020-07-10 | 南京宽超通信技术有限公司 | Multifunctional controller for satellite downlink tuner |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101741055A (en) * | 2009-12-31 | 2010-06-16 | 成都东银信息技术股份有限公司 | Method for protecting satellite television LNB from short circuit |
| CN102130671A (en) * | 2010-12-14 | 2011-07-20 | 苏州华芯微电子股份有限公司 | Special chip for DiSEqC switch |
| CN102710915A (en) * | 2012-05-29 | 2012-10-03 | 深圳市九洲电器有限公司 | LNB (Low Noise Block) power supply control circuit |
| CN203457050U (en) * | 2013-09-23 | 2014-02-26 | 福州福大海矽微电子有限公司 | A chip dedicated to LNB power control |
-
2013
- 2013-09-23 CN CN201310434653.6A patent/CN103475220B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101741055A (en) * | 2009-12-31 | 2010-06-16 | 成都东银信息技术股份有限公司 | Method for protecting satellite television LNB from short circuit |
| CN102130671A (en) * | 2010-12-14 | 2011-07-20 | 苏州华芯微电子股份有限公司 | Special chip for DiSEqC switch |
| CN102710915A (en) * | 2012-05-29 | 2012-10-03 | 深圳市九洲电器有限公司 | LNB (Low Noise Block) power supply control circuit |
| CN203457050U (en) * | 2013-09-23 | 2014-02-26 | 福州福大海矽微电子有限公司 | A chip dedicated to LNB power control |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020057493A1 (en) * | 2018-09-19 | 2020-03-26 | 青岛海信电器股份有限公司 | Overcurrent protection method and television receiver |
| CN109617403A (en) * | 2018-12-13 | 2019-04-12 | 珠海迈科智能科技股份有限公司 | A kind of LNB chip |
| CN109617403B (en) * | 2018-12-13 | 2021-01-29 | 珠海迈科智能科技股份有限公司 | LNB chip |
| CN111404596A (en) * | 2020-03-27 | 2020-07-10 | 南京宽超通信技术有限公司 | Multifunctional controller for satellite downlink tuner |
| CN111404596B (en) * | 2020-03-27 | 2022-01-28 | 南京宽超通信技术有限公司 | Satellite downlink high-frequency head controller |
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| Publication number | Publication date |
|---|---|
| CN103475220B (en) | 2016-04-06 |
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