CN200997651Y - Stabilized circuit and TV-set therewith - Google Patents
Stabilized circuit and TV-set therewith Download PDFInfo
- Publication number
- CN200997651Y CN200997651Y CN 200720017725 CN200720017725U CN200997651Y CN 200997651 Y CN200997651 Y CN 200997651Y CN 200720017725 CN200720017725 CN 200720017725 CN 200720017725 U CN200720017725 U CN 200720017725U CN 200997651 Y CN200997651 Y CN 200997651Y
- Authority
- CN
- China
- Prior art keywords
- voltage
- voltage stabilizing
- npn type
- type triode
- stabilizing didoe
- 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.)
- Expired - Fee Related
Links
Landscapes
- Television Receiver Circuits (AREA)
Abstract
A voltage stabilizing circuit is composed of a NPN type triode and a voltage-stabilizing diode, of which a base electrode of the NPN type triode is connected with a cathode of the voltage-stabilizing diode, and an anode of the voltage-stabilizing diode is connected to ground, and is also connected with the DC input power source through the bias resistance; a collector of the NPN type triode is connected with the DC input power source, and an emitter is connected with a DC power source output terminal.
Description
Technical field
The utility model relates to a kind of voltage stabilizing circuit, specifically, relates to a kind of simple voltage stabilizing circuit of low current of the DC-DC of realization conversion.
Background technology
In general, in order to reduce stand-by power consumption, when the television set standby, has only CPU work.When remote-controlled start-up, CPU can export a level and come the control switch transformer, makes its each road voltage normally export the TV operate as normal.Therefore, the required operating voltage of CPU must provide by coming separately, i.e. common our said standby power.Needed operating voltage is generally 3.3V during the CPU standby, and be generally 5V by the voltage of transformer output, if adopt modes such as LDO or DC-DC conversion chip to realize that 5V is to the conversion between the 3.3V voltage, not only circuit cost is higher, and it is bigger to take circuit board space, is not used in the global design of tv product.
Summary of the invention
Voltage stabilizing circuit generally adopts LDO or DC-DC conversion chip mode to realize to the utility model in the prior art in order to solve, the circuit cost height that is brought, take the big problem of circuit board space, provide a kind of novel low current simple voltage stabilizing circuit, adopt the discrete component overlap joint to realize, circuit structure is simple, and is with low cost.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of voltage stabilizing circuit comprises a NPN type triode and a voltage stabilizing didoe, and wherein, the base stage of described NPN type triode connects the negative electrode of described voltage stabilizing didoe on the one hand, and the plus earth of voltage stabilizing didoe connects direct-current input power supplying through biasing resistor on the other hand; The collector electrode of described NPN type triode connects described direct-current input power supplying, and emitter connects dc power output end.
For the direct voltage that makes described voltage stabilizing circuit output can satisfy peripheral circuit requirement, the reverse breakdown voltage value of described voltage stabilizing didoe should be chosen for the needed dc voltage value of peripheral circuit of the described dc power output end of connection and the BE junction voltage value sum of described NPN type triode.
Described direct-current input power supplying connects the collector electrode of described NPN type triode by the LC filter network, with the filtering high and low frequency wave interference of making an uproar.In order to ensure the work of NPN type triode normally, the magnitude of voltage of described direct-current input power supplying should be higher than the reverse breakdown voltage value of described voltage stabilizing didoe.
In the utility model, the magnitude of voltage of described direct-current input power supplying is 5V, and the reverse breakdown voltage of voltage stabilizing didoe is 4.1V, and the BE junction voltage of described NPN type triode is 0.7V, and the direct voltage of exporting by described dc power output end is 3.3V.
Another goal of the invention of the present utility model is to provide a kind of television set with above-mentioned voltage stabilizing circuit, provides the stand-by operation power supply by described voltage stabilizing circuit for the CPU in the Core of TV set plate.Its concrete annexation is: the base stage of described NPN type triode connects standby power through biasing resistor on the other hand on the one hand by described voltage stabilizing didoe ground connection; The collector electrode of described NPN type triode connects described standby power, and emitter connects the feeder ear of CPU.
For the direct voltage that makes the output of described voltage stabilizing circuit satisfies the power demands of CPU, the reverse breakdown voltage value of described voltage stabilizing didoe is the BE junction voltage value sum of required supply power voltage value of CPU and described NPN type triode.In existing TV set circuit, standby power by switch transformer output is generally 5V, and the required operational voltage value of CPU is generally 3.3V, so, in voltage stabilizing circuit of the present utility model, selecting the reverse breakdown voltage of voltage stabilizing didoe is 4.1V, the BE junction voltage of NPN type triode is 0.7V, like this, and after the conducting of NPN type triode, magnitude of voltage by its emitter output is 3.3V, can satisfy the power demands of CPU.
For high frequency, low frequency in the effective filtering voltage stabilizing circuit wave interference of making an uproar, described standby power connects the collector electrode of described NPN type triode by the LC filter network.
Compared with prior art, advantage of the present utility model and good effect are: the utility model is built voltage stabilizing circuit by adopting discrete component, by penetrating the characteristics low with the output impedance of circuit, that carrying load ability is strong, voltage after the voltage stabilizing didoe voltage stabilizing is penetrated with output, to satisfy the power demands of CPU in the machine core board, not only have significant advantages such as simple in structure, that cost is low, and it is little to take circuit board space, helps the miniaturization Design of electric equipment products.
Description of drawings
Fig. 1 is the schematic diagram of voltage stabilizing circuit in the utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is done explanation in further detail.
The utility model for satisfy in the TV SKD CPU when the standby still needs work on power, and at present the direct current regulation circuit cost height that adopted of TV set circuit, take the big problem of circuit board space, voltage stabilizing circuit structure has as shown in Figure 1 been proposed.Described voltage stabilizing circuit adopts the discrete component overlap joint to realize fully, utilizing NPN type triode Q11 to form penetrates with circuit, voltage after the voltage stabilizing didoe voltage stabilizing is penetrated with output,, fully satisfied the power demands of CPU by penetrating the characteristics low with circuit output impedance, that carrying load ability is strong.
Among Fig. 1,5V 1 is a direct-current input power supplying, and magnitude of voltage is+5V, in TV set circuit, this road voltage is produced separately by switch transformer from mainboard, only provides working power to CPU, when standby, can not reduce, i.e. our usually said standby power.Standby power 5V-1 carries out filtering by the filter network that inductance FB23 and two capacitor C 232 and C233 form, remove some high and low frequencies in circuit wave interference of making an uproar, and then the collector electrode of connection NPN type triode Q11, and, control its conducting work by the base stage that biasing resistor R230 connects NPN type triode Q11.The base stage of described NPN type triode Q11 connects the negative electrode of voltage stabilizing didoe D33 on the other hand, and the plus earth of described voltage stabilizing didoe D33 is pressed for the base stage of triode Q11 provides galvanic current.The emitter of described NPN type triode Q11 is the dc power output end of described voltage stabilizing circuit, connects the feeder ear of CPU in the TV SKD.Because the required operating voltage of CPU is 3.3V, and the BE junction voltage of triode Q11 is 0.7V, so in order to satisfy the power demands of CPU, the reverse breakdown voltage of described voltage stabilizing didoe D33 should be 3.3+0.7=4.1V.
In order to make the dc voltage stability of described voltage stabilizing circuit output, between the emitter of NPN type triode Q11 and ground, be connected with filter capacitor C202, C203 in parallel.
The operation principle of above-mentioned voltage stabilizing circuit is: the collector electrode of NPN type triode Q11 is powered by standby power 5V-1, and standby power 5V-1 provides bias current for the base stage of triode Q11 by resistance R 230 backs, because the collector voltage of triode Q11 is higher than base voltage, therefore, the CE knot can be partially anti-, make the base voltage voltage stabilizing at 4.1V by voltage stabilizing didoe D33, positively biased between the BE knot is operated in triode Q11 and penetrates with state.Because the pressure drop about 0.7V is arranged between the BE knot, and triode Q11 can export the voltage of 4.1-0.7=3.3V like this, for CPU provides operating voltage.The maximum output current of CPU is 80mA, and the 2SC2002 transistor npn npn that triode Q11 selects for use can provide the output current of 300mA, therefore, can satisfy the power needs of CPU fully.
Low current voltage stabilizing circuit of the present utility model is on implementation, and used device is less, and reliability is higher, and circuit structure is simple, realize easily, is adapted at applying in the stand-by circuit of electric equipment.
Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (10)
1. voltage stabilizing circuit, it is characterized in that: comprise a NPN type triode and a voltage stabilizing didoe, wherein, the base stage of described NPN type triode connects the negative electrode of described voltage stabilizing didoe on the one hand, the plus earth of voltage stabilizing didoe connects direct-current input power supplying through biasing resistor on the other hand; The collector electrode of described NPN type triode connects described direct-current input power supplying, and emitter connects dc power output end.
2. voltage stabilizing circuit according to claim 1 is characterized in that: the reverse breakdown voltage value of described voltage stabilizing didoe is the needed dc voltage value of peripheral circuit of the described dc power output end of connection and the BE junction voltage value sum of described NPN type triode.
3. voltage stabilizing circuit according to claim 1 and 2 is characterized in that: the magnitude of voltage of described direct-current input power supplying is higher than the reverse breakdown voltage value of described voltage stabilizing didoe.
4. voltage stabilizing circuit according to claim 3 is characterized in that: described direct-current input power supplying connects the collector electrode of described NPN type triode by the LC filter network.
5. voltage stabilizing circuit according to claim 1, it is characterized in that: the magnitude of voltage of described direct-current input power supplying is 5V, the reverse breakdown voltage of voltage stabilizing didoe is 4.1V, and the BE junction voltage of described NPN type triode is 0.7V, and the direct voltage of exporting by described dc power output end is 3.3V.
6. television set with the described voltage stabilizing circuit of claim 1, it is characterized in that: comprise a NPN type triode and a voltage stabilizing didoe, wherein, the base stage of described NPN type triode connects the negative electrode of described voltage stabilizing didoe on the one hand, the plus earth of voltage stabilizing didoe connects standby power through biasing resistor on the other hand; The collector electrode of described NPN type triode connects described standby power, and emitter connects the feeder ear of CPU.
7. television set according to claim 6 is characterized in that: the reverse breakdown voltage value of described voltage stabilizing didoe is the BE junction voltage value sum of required supply power voltage value of CPU and described NPN type triode.
8. according to claim 6 or 7 described television sets, it is characterized in that: the magnitude of voltage of described standby power is higher than the reverse breakdown voltage value of described voltage stabilizing didoe.
9. television set according to claim 8 is characterized in that: described standby power connects the collector electrode of described NPN type triode by the LC filter network.
10. television set according to claim 6, it is characterized in that: the magnitude of voltage of described standby power is 5V, the reverse breakdown voltage of voltage stabilizing didoe is 4.1V, and the BE junction voltage of described NPN type triode is 0.7V, and the direct voltage of exporting by the emitter of described NPN type triode is 3.3V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200720017725 CN200997651Y (en) | 2007-01-22 | 2007-01-22 | Stabilized circuit and TV-set therewith |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200720017725 CN200997651Y (en) | 2007-01-22 | 2007-01-22 | Stabilized circuit and TV-set therewith |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200997651Y true CN200997651Y (en) | 2007-12-26 |
Family
ID=38996085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200720017725 Expired - Fee Related CN200997651Y (en) | 2007-01-22 | 2007-01-22 | Stabilized circuit and TV-set therewith |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200997651Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107608442A (en) * | 2017-09-29 | 2018-01-19 | 深圳怡化电脑股份有限公司 | A kind of accurate voltage-stabilizing circuit |
| CN108258902A (en) * | 2018-01-02 | 2018-07-06 | 郑州云海信息技术有限公司 | A kind of design method and circuit that LDO functions are realized by discrete original paper |
| CN109189137A (en) * | 2018-09-03 | 2019-01-11 | 西安微电子技术研究所 | A kind of bipolar Flouride-resistani acid phesphatase 5A low pressure wide-band linearity voltage-stablizer |
-
2007
- 2007-01-22 CN CN 200720017725 patent/CN200997651Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107608442A (en) * | 2017-09-29 | 2018-01-19 | 深圳怡化电脑股份有限公司 | A kind of accurate voltage-stabilizing circuit |
| CN108258902A (en) * | 2018-01-02 | 2018-07-06 | 郑州云海信息技术有限公司 | A kind of design method and circuit that LDO functions are realized by discrete original paper |
| CN109189137A (en) * | 2018-09-03 | 2019-01-11 | 西安微电子技术研究所 | A kind of bipolar Flouride-resistani acid phesphatase 5A low pressure wide-band linearity voltage-stablizer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1518200B (en) | Switching power supply unit | |
| CN103701337B (en) | A kind of power-supply system | |
| CN204131210U (en) | Power supply switch circuit and portable electric appts | |
| CN203301611U (en) | Direct-current switching circuit and switching power source | |
| CN203368356U (en) | Power supply circuit and television | |
| CN103219893A (en) | Switch power supply controller and switch power supply circuit | |
| CN102801310B (en) | Direct-current switch power supply circuit | |
| CN202190212U (en) | Overvoltage control circuit, low-power-consumption power circuit and television | |
| CN200997651Y (en) | Stabilized circuit and TV-set therewith | |
| CN102710915B (en) | LNB (Low Noise Block) power supply control circuit | |
| WO2011131015A1 (en) | Direct current/direct current converter for acquiring stabilized low voltage and telephone power supply circuit | |
| CN203632222U (en) | Output short circuit protection circuit of flyback converter | |
| CN203660911U (en) | Flyback AC-DC converter | |
| CN203368003U (en) | Dual protection device for Boost circuit | |
| CN219436854U (en) | Voltage-adjustable power supply conversion device and system | |
| CN101471605B (en) | Power supply circuit | |
| CN106604472B (en) | LED drive circuit | |
| CN101364771B (en) | Single chip controlled power supply apparatus | |
| CN205249053U (en) | Television circuit board power supply line | |
| CN210246392U (en) | Power supply control circuit, auxiliary power supply circuit, power supply system and electronic equipment | |
| CN209805675U (en) | Logic voltage conversion circuit applied to T-CON board | |
| CN203660912U (en) | Power system | |
| CN202931200U (en) | Small-volume high-power-density module power supply | |
| CN202306373U (en) | Direct current voltage-reducing and voltage-stabilizing circuit | |
| CN203191920U (en) | Main board power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071226 Termination date: 20110122 |