CN203457050U - A chip dedicated to LNB power control - Google Patents
A chip dedicated to LNB power control Download PDFInfo
- Publication number
- CN203457050U CN203457050U CN201320587238.XU CN201320587238U CN203457050U CN 203457050 U CN203457050 U CN 203457050U CN 201320587238 U CN201320587238 U CN 201320587238U CN 203457050 U CN203457050 U CN 203457050U
- Authority
- CN
- China
- Prior art keywords
- circuit
- module
- output
- lnb
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model relates to a chip dedicated to LNB power control. The chip dedicated to LNB power control is equipped with a 1.1MHz DC-DC boost module, a reference voltage module, a voltage regulator module, a 14V/19V voltage switching control module, 22K waveform generation control module output, a LNB output and protection unit module, and a current detection restriction module. The 1.1MHz DC-DC boost module is connected with the reference voltage module. The voltage regulator module is connected with the 14V/19V voltage switching control module. The input end of the LNB output and protection unit module is connected with the output end of the 1.1MHz DC-DC boost module, the 22K waveform generation control module output, and the output end of the current detection restriction module.
Description
Technical field
The utility model relates to a kind of LNB power supply and controls 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; Meanwhile,, in system Installation and Debugging process and information source antenna inductive load machine operation process, very easily there is short circuit and load overcurrent state in the outdoor unit part due to system, 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, 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 utility model is to provide a kind of LNB power supply and controls special chip, and task of the present utility model realizes by following technical solution:
LNB power supply of the present utility model 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 DC-DC boost module is connected with 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 utility model comprises that integration packaging is in SOP8EP (with the small-sized 8 pin package sheets of ground connection heat dissipation bonding pad) and peripheral pin function definition sequence.
The utility model is controlled application actual demand mainly for LNB information source and power supply; in conjunction with prolonged application experience; introduce high accuracy pulse shaping technique and overcurrent protection algorithm; overcome existing LNB information source control circuit scheme control signal distortion and the large shortcoming of power supply noise; optimize peripheral circuit simultaneously, realize the complete function output in the case chip of SOP8EP.The utility model 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.The utility model product design 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 sequencing control submodule, realize output waveform timing synchronization in host computer input signal, meet DiSeqc(Digital Satellite Equipment Control--digital satellite equipment control protocol) signal sequence demand.
2. perfect protection mechanism:
Output voltage detection type overcurrent and the short-circuit protection circuit of the utility model abandoning tradition, 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.
In conjunction with BST circuit and LNB output insulation blocking, inductance magnetic saturation, detect the multinomial abnormal condition protection measures such as protective circuit, junction temperature detection protective circuit, 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, minimizes 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 the utility model chip, can the various incoming levels of compatible 1.05V～5V, simultaneously without external interface element, and minimized peripheral cell.
The SOP8EP encapsulation of simplifying most, further Cost optimization, pin sequence considers the digital-to-analog circuit isolation of practical application, and adopts single-point type large area ground connection, improves the ease for use of follow-up machine product PCB design and the reliability of scheme.
Accompanying drawing explanation
Fig. 1 is the scheme block diagram of a kind of embodiment of the utility model;
Fig. 2 is a kind of active 22K waveform generation control module block diagram of the present utility model;
Fig. 3 is a kind of LNB output of the present utility model and protected location module frame chart;
Fig. 4 is a kind of encapsulation of the utility model and pin ordering chart.
Embodiment
Specific embodiment below in conjunction with accompanying drawing further illustrates the utility model.(but not being to restriction of the present utility model).
As shown in Figure 1, be the block diagram of a kind of embodiment of the present utility model.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 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 utility model completes the boost function of 12V input voltage by 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.DisEqc control signal, by 22K_IN (control signal pin) input, is synchronized with inner 22K waveform generator and completes the high-precision reshaping controls such as wave-shape amplitude, rising edge and trailing edge, duty ratio.Current limiting unit realizes the monitor and detection to output branch current, and carries out 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 with SOP8EP encapsulation and minimum peripheral cell, realize complete LNB and control function.
If Fig. 2 is a kind of active 22K waveform generation control module block diagram of the present utility model, 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: 22K frequency generator is connected with the Synchronization Control of outside input waveform decision circuitry; 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 shaping control circuit is connected with LNB output and protected location module.
22K control waveform of the present utility model is completed by built-in high accuracy frequency generator, and this control signal sequential is inputted waveform decision circuitry by outside and synchronizeed with 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 protected location module is mixed, complete the output of high-fidelity control signal.
If Fig. 3 is a kind of LNB output of the utility model and protected location module frame chart; LNB output and protected location module are provided with 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 I/O buffer circuit, input and output buffer circuit is connected with external boost inductance; LNB output unit circuit is connected with inductance magnetic saturation testing circuit, and 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 algorithm of the present utility model:
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. when circuit enters after protection, regularly attempt active circuit, the ON/OFF of 60mS/1400mS intermittently state detects, until circuit recovers normal.After realizing abnormality and withdrawing, the self-recovering function of circuit.
The built-in high-power output mos FET pipe of LNB output unit of the present utility model; and introduced 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.
L image current inspection: image current detection technique is the contactless current detection technology that I take charge of independent research, this technology in particular for loop current, provide contactless current detecting, and isolate with output large current load, minimize the impact of output circuit load variations on accuracy of detection, simultaneously for the energy conversion efficiency of low-power consumption output and project alternative is given security.The one-step optimization of going forward side by side is exported the quantity of high-power detection means, optimizes project alternative cost.
L output voltage detects: when output voltage is 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:
If Fig. 4 is a kind of SOP8EP pin function definition of the utility model and pin sequence
Pin sequence of the present utility model and function are defined as follows:
| Symbol | Sequence number | Describe |
| V_IN | 1 | Power supply input pin |
| REG_C | 2 | Built-in reference voltage decoupling pin: must an external 0.1uF |
| V_OUT | ||
| 3 | LNB Voltage- | |
| BST | ||
| 4 | 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 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; During low level, be output as V=14.3 |
| 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 V_OUT output is added to | |
| | 9 | Chip belly ground pad |
Chip of the present utility model 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 area ground connection weld tabs single-point access; and pin sequence considers the digital-to-analog circuit isolation of practical application; improve the ease for use of machine product PCB design, when reducing chip cost, improve the use consistency of product.
Circuit height of the present utility model is integrated in the 8 pin case chips of SOP8EP, and according to practical application request, the sequence of definition pin, is isolated in the digital-to-analogue ground connection of circuit 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 l ON/OFF pin is controlled, and directly connects control interface, without any outward element;
L 22K_IN pin is with reference to 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 be connected with the negative terminal of Schottky diode D1 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, is directly systematically connected with PCB, 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 embodiment of the utility model, all similar changes of doing according to above-mentioned design, ought to belong to scope of the present utility model.
Claims (2)
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 DC-DC boost module is connected with 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; 22K frequency generator is connected with the Synchronization Control of outside input waveform decision circuitry; 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 shaping control circuit is connected with LNB output and protected location module; Described LNB output and protected location module is provided with LNB output unit, junction temperature detects 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 I/O buffer circuit, and input and output buffer circuit is connected with external boost inductance; LNB output unit circuit is connected with inductance magnetic saturation testing circuit, and 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. 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, described pin and outward element annexation:
It is the output switch of circuit that ON/OFF pin is controlled, and directly connects control interface;
22K_IN pin is with reference to sync waveform input, directly connects control interface;
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;
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, and external C3 decoupling capacitance, is connected with the negative terminal of Schottky diode D1 simultaneously;
V_OUT is circuit voltage and control waveform mixing output, external C5;
GND is system power supply ground, is directly systematically connected with PCB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320587238.XU CN203457050U (en) | 2013-09-23 | 2013-09-23 | A chip dedicated to LNB power control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320587238.XU CN203457050U (en) | 2013-09-23 | 2013-09-23 | A chip dedicated to LNB power control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203457050U true CN203457050U (en) | 2014-02-26 |
Family
ID=50136896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320587238.XU Withdrawn - After Issue CN203457050U (en) | 2013-09-23 | 2013-09-23 | A chip dedicated to LNB power control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203457050U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475220A (en) * | 2013-09-23 | 2013-12-25 | 福州福大海矽微电子有限公司 | Chip special for LNB power source and information source control |
-
2013
- 2013-09-23 CN CN201320587238.XU patent/CN203457050U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475220A (en) * | 2013-09-23 | 2013-12-25 | 福州福大海矽微电子有限公司 | Chip special for LNB power source and information source control |
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204391770U (en) | For the equipment using multiport electric supply to charge for device | |
| CN203747451U (en) | Battery charging device | |
| CN115765433A (en) | Chip embedded power converter | |
| CN103762691A (en) | Battery charging device and battery charging protection control method | |
| CN103762702A (en) | Charging device of electronic equipment and power adapter of charging device | |
| CN103607009B (en) | A kind of charge-discharge circuit with automatic protection functions | |
| CN204131210U (en) | Power supply switch circuit and portable electric appts | |
| WO2020037912A1 (en) | Beidou navigation system based vehicle-mounted inteligent terminal | |
| CN104062928A (en) | Power supply circuit of electric vehicle controller | |
| CN103475220B (en) | A kind of LNB power supply and information source control special chip | |
| CN103731046A (en) | Dynamic rectifying control circuit, passive radio frequency identification (RFID) and dynamic rectifying control method | |
| CN203747452U (en) | Battery charging device | |
| CN203457050U (en) | A chip dedicated to LNB power control | |
| CN204008785U (en) | Measurement loop fault monitoring system | |
| CN207135003U (en) | Active rectifier | |
| CN105515223A (en) | Method and circuit for wireless transmission of high-power electrical energy | |
| CN117097165A (en) | Driving scheme for secondary controlled Active Clamp Flyback (ACF) mode | |
| CN203632566U (en) | Secondary feedback effective integrated multi-protection constant-voltage control circuit for LED driving | |
| CN103199689B (en) | A kind of Switching Power Supply with input voltage undervoltage lookout function | |
| CN202978910U (en) | Digital satellite receiver and LNB power supply control circuit thereof | |
| CN213186034U (en) | Junction box and photovoltaic module | |
| CN205004734U (en) | Auxiliary electrical power source and protection control circuit thereof | |
| CN214154345U (en) | Power module and power system | |
| CN209860818U (en) | AC-DC conversion circuit | |
| CN104682709A (en) | High-frequency voltage boosting circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140226 Effective date of abandoning: 20160406 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |