CN210927794U - Tuner power supply control circuit - Google Patents
Tuner power supply control circuit Download PDFInfo
- Publication number
- CN210927794U CN210927794U CN201922146583.XU CN201922146583U CN210927794U CN 210927794 U CN210927794 U CN 210927794U CN 201922146583 U CN201922146583 U CN 201922146583U CN 210927794 U CN210927794 U CN 210927794U
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- China
- Prior art keywords
- power supply
- voltage
- unit
- voltage stabilizing
- stabilizing unit
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- 230000000087 stabilizing effect Effects 0.000 claims abstract description 53
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 claims description 9
- 239000003381 stabilizer Substances 0.000 claims description 5
- 230000005611 electricity Effects 0.000 abstract description 9
- 230000033228 biological regulation Effects 0.000 description 10
- 230000006641 stabilisation Effects 0.000 description 5
- 238000011105 stabilization Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Direct Current Feeding And Distribution (AREA)
Abstract
The utility model relates to a tuner power supply control circuit, including first power supply input end, first voltage stabilizing unit, filtering unit, second power supply input end, on-off control unit, second voltage stabilizing unit and power supply output, first power supply input end is connected with the input electricity of first voltage stabilizing unit, the output of first voltage stabilizing unit with the input electricity of second voltage stabilizing unit is connected, filtering unit electric connection is in first voltage stabilizing unit with between the second voltage stabilizing unit, the output of second voltage stabilizing unit with the power supply output electricity is connected, the second power supply input end passes through on-off control unit with the input electricity of second voltage stabilizing unit is connected. The utility model discloses second power supply input has integrateed on the power strip as stand-by power supply to through the output voltage of on-off control unit control second power supply input, ensure that output voltage matches with the operating voltage of tuner, improve the stability of tuner work.
Description
Technical Field
The utility model relates to a tuner technical field especially relates to a tuner power supply control circuit.
Background
In home entertainment, a set-top box is an indispensable part, and the set-top box is a device for connecting a television set and an external signal source. It can convert the compressed digital signal into television content and display it on the television. The signals may come from cable, satellite dish, broadband network and terrestrial broadcast. The tuner is used as a part of the set-top box and is used for receiving satellite signals and filtering and amplifying the received signals, so that the television is ensured to receive clear video signals.
Generally, a tuner is directly powered by a power panel in a television, but an existing power supply circuit is generally obtained after voltage reduction by a voltage stabilizer, but a plurality of power supply circuits integrated on the power panel, including an SOC power supply circuit, a USB power supply circuit and the like, greatly affect the voltage stabilizer, cause the voltage stabilizer to be easily overheated and to have a fault, and therefore cause the tuner not to work normally and affect the normal viewing of a user.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide a tuner power supply control circuit for a tuner power supply circuit that integrates the second power supply input terminal as a backup power supply, and controls the output voltage of the second power supply input terminal through the switch control unit, so as to ensure the output voltage to match the operating voltage of the tuner and improve the stability of the tuner operation, in response to the situation that the tuner power supply circuit is prone to overheat and malfunction.
The utility model provides a tuner power supply control circuit, includes first power supply input, first voltage stabilizing unit, filtering unit, second power supply input, on-off control unit, second voltage stabilizing unit and power supply output, first power supply input is connected with first voltage stabilizing unit's input electricity, first voltage stabilizing unit's output with second voltage stabilizing unit's input electricity is connected, filtering unit electricity is connected first voltage stabilizing unit with between the second voltage stabilizing unit, second voltage stabilizing unit's output with power supply output electricity is connected, second power supply input passes through on-off control unit with second voltage stabilizing unit's input electricity is connected.
Preferably, the switch control unit includes a switch K1, a voltage detection unit and a voltage control unit, the voltage detection unit is connected in parallel to the switch K1, the input terminal of the switch K1 is electrically connected to the second power supply input terminal, and the output terminal of the switch is electrically connected to the input terminal of the second voltage regulation unit through the voltage control unit.
Preferably, the voltage detection unit is a voltmeter.
Preferably, the voltage control unit includes resistors R1-R3 and switches K2-K4, one ends of the resistors R1-R3 are respectively connected in series with one ends of the switches K2-K4, the other ends of the resistors R1-R3 are respectively electrically connected with an output end of the switch K1, and the other ends of the switches K2-K4 are respectively electrically connected with an input end of the second voltage stabilization unit.
Preferably, the first voltage stabilizing unit and the second voltage stabilizing unit are linear voltage regulators.
Preferably, the filter unit includes capacitors C1 to C3, one ends of the capacitors C1 to C3 are electrically connected between the first voltage stabilizing unit and the second voltage stabilizing unit, and the other ends of the capacitors C1 to C3 are grounded.
The utility model discloses an useful part lies in: 1. the voltage on the power supply board is supplied to the tuner after passing through the dual voltage stabilizer, so that the voltage is more stable, and the use requirement of the tuner is met; 2. the second power supply input end used as a standby power supply is further arranged, the second power supply input end controls the output voltage and the stability of the output voltage through the switch control unit, the situation that the voltage input into the second voltage stabilizing unit is too high, the second voltage stabilizing unit is overheated and breaks down is avoided, and the stability of the tuner power supply circuit is improved.
Drawings
Fig. 1 is a schematic diagram of a power supply control circuit of a tuner according to an embodiment;
FIG. 2 is a diagram of a power supply control circuit of one tuner;
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1-2, a tuner power supply control circuit includes a first power supply input terminal 1, a first voltage stabilizing unit 2, a filter unit 3, a second power supply input terminal 4, a switch control unit 5, a second voltage stabilizing unit 6 and a power supply output terminal 7, where the first power supply input terminal 1 is electrically connected to an input terminal of the first voltage stabilizing unit 2, an output terminal of the first voltage stabilizing unit 2 is electrically connected to an input terminal of the second voltage stabilizing unit 6, the filter unit 3 is electrically connected between the first voltage stabilizing unit 2 and the second voltage stabilizing unit 6, an output terminal of the second voltage stabilizing unit 6 is electrically connected to the power supply output terminal 7, and the second power supply input terminal 4 is electrically connected to an input terminal of the second voltage stabilizing unit 6 through the switch control unit 5. Specifically, in this embodiment, currently, the working voltage of most of the tuners is 5V, the voltage on the power board of the television is generally 24V, the voltage of 24V is reduced to 8V after passing through the first voltage stabilizing unit 2, and the second voltage stabilizing unit 6 outputs the 5V working voltage after performing level conversion on the received 8V voltage, so as to provide electric quantity for the tuners. Specifically, be provided with filtering unit 3 between first voltage regulation unit 2 and second voltage regulation unit 6, the electric ripple that can the output of first voltage regulation unit 2 of filtering levels voltage. Secondly, a second power supply input end 4 is arranged as a standby power supply, specifically in the embodiment, the voltage of the second power supply input end 4 is 12V, when the MCU (not shown in the figure) detects that the first voltage stabilizing unit 2 has an overheat fault and is open-circuited, the MCU controls the switch control unit 5 to be closed, and the second power supply input end 4 supplies power to the tuner, so as to ensure that the tuner can normally operate without affecting the normal viewing requirements of users.
As shown in fig. 2, the switch control unit 5 includes a switch K1, a voltage detection unit 51 and a voltage control unit 52, the voltage detection unit 52 is connected in parallel to the switch K1, the input terminal of the switch K1 is electrically connected to the second power supply input terminal 4, and the output terminal of the switch K1 is electrically connected to the input terminal of the second voltage stabilization unit 6 through the voltage control unit 52. Specifically, in this embodiment, after the MCU detects a fault of the first voltage stabilizing unit 2, the control switch K1 is turned on, the voltage detecting unit 51 detects the voltage at two ends of the switch K1, and feeds back the detection result to the MCU, and after the MCU receives the feedback information, the voltage controlling unit 52 is controlled to divide the voltage, so as to avoid overheating of the second voltage stabilizing unit 6. Specifically, in this embodiment, the voltage detection unit 51 is a voltmeter.
As shown in fig. 2, the voltage control unit 52 includes resistors R1-R3 and switches K2-K4, wherein one ends of the resistors R1-R3 are respectively connected in series with one ends of the switches K2-K4, the other ends of the resistors R1-R3 are respectively electrically connected with an output end of the switch K1, and the other ends of the switches K2-K4 are respectively electrically connected with an input end of the second voltage stabilization unit 6. Specifically, three voltage division circuits with resistors and switches connected in parallel are arranged, because the output of the second power supply input end 4 serving as a standby power supply on the power panel is unstable, the voltage fluctuation is large, the MCU selects to be closed K2, K3 and K4 according to the real-time detection result of the voltmeter V, the R1-R3 divide the voltage to adjust the output voltage, the pressure of the second voltage stabilization unit 6 is reduced, and overheating and scalding of the second voltage stabilization unit are avoided.
The first voltage regulation unit 2 and the second voltage regulation unit 6 are linear voltage regulators.
As shown in fig. 2, the filter unit 3 includes capacitors C1 to C3, one ends of the capacitors C1 to C3 are electrically connected between the first voltage regulator unit 2 and the second voltage regulator unit 6, and the other ends of the capacitors C1 to C3 are grounded. Specifically, set up three electric capacity C1 ~ C3 between first voltage regulation unit 2 and second voltage regulation unit 6 to make the output voltage of first voltage regulation unit 2 more steady, and, set up C3 between voltage control unit 52 and second voltage regulation unit 6, can level and smooth the voltage of second power supply input end input, save the components and parts quantity on the PCB board, reduce cost.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (6)
1. A tuner power supply control circuit, characterized in that: the power supply device comprises a first power supply input end, a first voltage stabilizing unit, a filtering unit, a second power supply input end, a switch control unit, a second voltage stabilizing unit and a power supply output end, wherein the first power supply input end is electrically connected with the input end of the first voltage stabilizing unit, the output end of the first voltage stabilizing unit is electrically connected with the input end of the second voltage stabilizing unit, the filtering unit is electrically connected between the first voltage stabilizing unit and the second voltage stabilizing unit, the output end of the second voltage stabilizing unit is electrically connected with the power supply output end, and the second power supply input end is electrically connected with the input end of the second voltage stabilizing unit through the switch control unit.
2. A tuner power supply control circuit as claimed in claim 1 wherein: the switch control unit comprises a switch K1, a voltage detection unit and a voltage control unit, the voltage detection unit is connected to the switch K1 in parallel, the input end of the switch K1 is electrically connected with the second power supply input end, and the output end of the switch K1 is electrically connected with the input end of the second voltage stabilizing unit through the voltage control unit.
3. A tuner power supply control circuit as claimed in claim 2 wherein: the voltage detection unit is a voltmeter.
4. A tuner power supply control circuit as claimed in claim 3 wherein: the voltage control unit comprises resistors R1-R3 and switches K2-K4, one ends of the resistors R1-R3 are respectively connected with one ends of the switches K2-K4 in series, the other ends of the resistors R1-R3 are respectively electrically connected with the output end of the switch K1, and the other ends of the switches K2-K4 are respectively electrically connected with the input end of the second voltage stabilizing unit.
5. A tuner power supply control circuit as claimed in claim 1 wherein: the first voltage stabilizing unit and the second voltage stabilizing unit are linear voltage stabilizers.
6. A tuner power supply control circuit as claimed in claim 5, wherein: the filtering unit comprises capacitors C1-C3, one ends of the capacitors C1-C3 are electrically connected between the first voltage stabilizing unit and the second voltage stabilizing unit, and the other ends of the capacitors C1-C3 are grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922146583.XU CN210927794U (en) | 2019-12-04 | 2019-12-04 | Tuner power supply control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922146583.XU CN210927794U (en) | 2019-12-04 | 2019-12-04 | Tuner power supply control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210927794U true CN210927794U (en) | 2020-07-03 |
Family
ID=71344669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922146583.XU Expired - Fee Related CN210927794U (en) | 2019-12-04 | 2019-12-04 | Tuner power supply control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210927794U (en) |
-
2019
- 2019-12-04 CN CN201922146583.XU patent/CN210927794U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200703 |