CN201717785U - Direct current voltage booster circuit and television comprising same - Google Patents
Direct current voltage booster circuit and television comprising same Download PDFInfo
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- CN201717785U CN201717785U CN2010201897859U CN201020189785U CN201717785U CN 201717785 U CN201717785 U CN 201717785U CN 2010201897859 U CN2010201897859 U CN 2010201897859U CN 201020189785 U CN201020189785 U CN 201020189785U CN 201717785 U CN201717785 U CN 201717785U
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- storage inductor
- circuit
- voltage booster
- booster circuit
- energy storage
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Abstract
The utility model discloses a direct current voltage booster circuit and a television comprising same, which comprise an energy-storage inductor, a direct current input power source charging and storing energy for the energy-storage inductor, and a switch circuit connected in a charging circuit of the energy-storage inductor and used for controlling the charging and discharging of the energy-storage inductor. Electric energy discharged from the energy-storage inductor is output through a direct current power source output terminal. Formed by simple discrete components, the direct current voltage booster circuit is not required to rely on specific integrated chips, thereby reducing cost. Compared with a traditional capacity feedback oscillation voltage booster circuit, the direct current voltage booster circuit has the advantages that the structural design is simpler, the quantity of used components is less, occupied PCB area is small, and the operational reliability of circuit is high. The applification of the direct current voltage booster circuit in the power supply circuit design of household electrical appliances, such as the television and the like, can not only effectively control complete machine cost, but also bring convenience to the miniaturization design of equipment.
Description
Technical field
The utility model belongs to the direct current regulation circuit technical field, specifically, and the television receiver that relates to a kind of DC-DC booster circuit and adopt described DC voltage booster circuit design.
Background technology
In the design of audiovisual electronic product such as existing television set, use the stabilized voltage power supply of various magnitudes of voltage through regular meeting, also can use the boost type power circuit of DC-to-DC sometimes.Boost type DC-DC power circuit commonly used generally all is to adopt special integrated chip to cooperate complicated peripheral components to realize, the circuit complexity, and the cost height is not suitable for being extensive use of in the fierce relatively household appliances of price competition.
In order to break away from dependence to special integrated chip, to reduce the complete machine cost, a kind of capacitive feedback oscillation type dc booster circuit of being made up of discrete component has fully appearred at present, as shown in Figure 1, mainly comprise the Switching Power Supply of forming by energy storage inductor L1, double diode device D2, coupling capacitance C6 and boost capacitor C7, and colpitts feedback sinusoidal oscillator two parts of forming by inductance L 2, L3, NPN type triode Q1 and capacitor C 3～C5.With boost to from+12V direct voltage+the 33V direct voltage is that example is worked as after power circuit starts, + 12V DC power supply is normally exported, oscillating circuit begins starting of oscillation, output oscillating voltage signal, and its peak value affacts the intermediate node of double diode device D2 by coupling capacitance C6.Give boost capacitor C7 charging by double diode device D2 under frequency of oscillation, the voltage on the boost capacitor C7 can be elevated to a certain level like this.Different frequencies of oscillation, this level value difference.For television receiver,, can obtain the direct voltage of about 33V, thereby can satisfy the power demands of tuner when frequency of oscillation during in the 600KHz left and right sides.
This capacitive feedback oscillation type dc boost circuit structure complexity, the component number of use is more, need take bigger PCB space, and reliability of operation can not obtain strong assurance, and therefore, practical application effect is unsatisfactory.
The utility model content
The utility model provides a kind of DC voltage booster circuit simple in structure in order to solve the existing lower problem of DC voltage booster circuit complex structure, reliability that adopts discrete component to set up, and has simplified circuit design, has improved the circuit reliability of operation.
In order to solve the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of DC voltage booster circuit comprises energy storage inductor, is the direct-current input power supplying of described energy storage inductor charging accumulation of energy, and is connected in the charge circuit of described energy storage inductor, is used to control the switching circuit that described energy storage inductor discharges and recharges; The electric energy that described energy storage inductor discharges is exported by dc power output end.
Further, the control end connection processing device of described switching circuit, the switch controlling signal of receiving processor output, the switch ways of switching circuit is connected in the charge circuit of described energy storage inductor.
Preferably, the pwm signal output of the control end connection processing device of described switching circuit, the switch controlling signal of the PWM form of receiving processor output.
Further again, an end of described energy storage inductor connects described direct-current input power supplying, and the other end is by the switch ways ground connection of described switching circuit.
Wherein a kind of establishment structure as described switching circuit, in described switching circuit, include a NPN type triode, the base stage receiving key control signal of described triode, grounded emitter, collector electrode connects described energy storage inductor, and is connected with described dc power output end.
In order to guarantee the correct flow direction of electric current, the electric energy that described energy storage inductor is discharged pours in down a chimney diode and connects described dc power output end by anti-.
Further again, be connected with a voltage stabilizing didoe at described dc power output end, the reverse breakdown voltage of described voltage stabilizing didoe equals to be connected the desired operating voltage of late-class circuit of described dc power output end.
Further, also be connected with rc filter circuit at described dc power output end.
For interference signal that can the filtering different frequency, in described rc filter circuit, be provided with the filter capacitor of a plurality of difference appearance values parallel with one another.
Based on above-mentioned DC voltage booster circuit structure, the utility model provides a kind of television set that adopts described DC voltage booster circuit design again, utilize the low-voltage dc power supply of TV set power plate output to charge for energy storage inductor, and in the charge circuit of energy storage inductor, connect switching circuit, turn-off sequential by the switching frequency or the conducting that change switching circuit, adjust discharging and recharging the time of energy storage inductor, and then the electric energy by energy storage inductor output can be elevated on the desired operating voltage amplitude of back level power circuit, export to late-class circuit by dc power output end then, to satisfy the power reguirements of late-class circuit.
Compared with prior art, advantage of the present utility model and good effect are: DC voltage booster circuit of the present utility model adopts simple discrete component to set up and forms, not only broken away from dependence to special integrated chip, reduced cost, and compare traditional capacitive feedback oscillation step-up circuit, structural design is more succinct, uses the quantity of components and parts few, it is little to take the PCB area, circuit operational reliability height.Be applied to not only can effectively control the complete machine cost in the power circuit design of household appliances such as television set, and brought convenience for the miniaturization Design of equipment.
After reading the detailed description of the utility model execution mode in conjunction with the accompanying drawings, other characteristics of the present utility model and advantage will become clearer.
Description of drawings
Fig. 1 is a kind of circuit design principle figure of existing capacitive feedback oscillation step-up circuit;
Fig. 2 is the circuit theory diagrams of a kind of embodiment of the DC voltage booster circuit that proposes of the utility model.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is done explanation in further detail.
The utility model is in order to reduce hardware cost, simplify circuit design, adopt energy storage inductor and switching circuit to design DC voltage booster circuit, utilize existing processor comes the switching circuit of control connection in the energy storage inductor charge circuit in the electronic product break-make frequency or break-make sequential, and then change the voltage magnitude of exporting by described energy storage inductor, to satisfy the power demands of late-class circuit.
Be example below with the television set, elaborate the concrete establishment structure and the operation principle thereof of described DC voltage booster circuit by a specific embodiment.
Embodiment one, and referring to shown in Figure 2, the switching circuit of present embodiment is that example describes with NPN type triode Q32.The collector and emitter of NPN type triode Q32 is connected in the charge circuit of energy storage inductor L52, such as grounded emitter with NPN type triode Q32, collector electrode connects the end of energy storage inductor L52, the other end of energy storage inductor L52 is by current-limiting resistance R326 or directly connect direct-current input power supplying, such as+12V DC power supply 12V_M.The base stage connection processing device of NPN type triode Q32 or by configuration resistance R 204 connection processing devices, with the switch controlling signal of receiving processor output.In the present embodiment, described processor can directly adopt the master chip on the TV SKD to carry out circuit design, utilize the GPIO mouth or the PWM interface of master chip to export described switch controlling signal, with switching frequency or the break-make sequential of control NPN type triode Q32.
Present embodiment is that example describes with the switch controlling signal of PWM form, and the high-low level of the pwm signal by television set master chip output changes the make-and-break time of controlling NPN type triode Q32.When the pwm signal of master chip output is in high level state, NPN type triode Q32 saturation conduction, direct-current input power supplying 12V_M charges to energy storage inductor L52 by resistance R 326, store electrical energy.And when the pwm signal of master chip output is in low level state, triode Q32 ends, by the characteristic of energy storage inductor L52 as can be known, energy storage inductor L52 goes up the electric energy that stores and can promptly discharge in a short period of time, and then can be from the direct voltage of connected dc power output end TU_33V generation higher magnitude, such as the direct voltage of the output+33V that boosts, to satisfy the power demands of the late-class circuit that is connected with described dc power output end TU_33V.Such as the non-Unitary tuner that connects in the television set, for tuner provide its work required+the 33V dc supply.
Adopt this booster circuit to set up structure, the duty ratio of the pwm signal by changing master chip output just can be controlled the ON time of NPN type triode Q32, to realize the accommodation to the output dc voltage amplitude.
In order to guarantee the correct flow direction of electric current, present embodiment also further is connected with the anti-diode D109 that pours in down a chimney between energy storage inductor L52 and dc power output end TU_33V, as shown in Figure 2, its anode connects the end that energy storage inductor L52 discharges electric energy, negative electrode connects dc power output end TU_33V, can export from dc power output end TU_33V exactly by the electric energy that energy storage inductor L52 discharges guaranteeing, then the electric current of level circuit can not counter be irritated back energy storage inductor L52, influences the correct output of booster circuit.
In order to realize the stable of output voltage, present embodiment has designed a voltage stabilizing didoe D9 on dc power output end TU_33V, as shown in Figure 2, its negative electrode connects dc power output end TU_33V, plus earth by reasonably selecting the reverse breakdown voltage parameter of described voltage stabilizing didoe D9, makes it just equal the desired operating voltage of late-class circuit, such as+33V, thus can so that the dc voltage stability by dc power output end TU_33V output on+33V.
In order further to improve the stability of output voltage, present embodiment also further is connected with rc filter circuit R201, R202, CE39, C184 and CE36 between energy storage inductor L52 and dc power output end TU_33V, as shown in Figure 2, with the ripple of making an uproar of the interference in the filtering circuit.For the interference signal of different frequency in can filtering circuit, preferably when the described rc filter circuit of design, select the filter capacitor of a plurality of different appearance values to carry out parallel connection, such as CE39, C184 and CE36 etc., to absorb the disturbing pulse of different frequency.
In the DC voltage booster circuit of present embodiment, switching circuit wherein is that example is illustrated with NPN type triode Q32 only.Certainly, also can adopt metal-oxide-semiconductor, relay, other components and parts with on-off action such as controllable silicon carry out circuit design, only need the control end of switch element is connected on the master chip, receive the switch controlling signal of master chip output, the switch ways of switching circuit is connected in the charge circuit of energy storage inductor L52, specifically can be connected between energy storage inductor L52 and the ground or between energy storage inductor L52 and the direct-current input power supplying 12V_M, break-make sequential by the control switch element, utilize the accumulation of energy boosting of energy storage inductor L52, can obtain the DC power supply of the amplitude that requires.
DC voltage booster circuit of the present utility model is simple in structure, the use component number is less, and reliability height, with low cost, can export desired operating voltage according to the need for electricity of late-class circuit, to satisfy the work requirements of different power circuits, especially be fit to be applied in the circuit design of household appliances such as television set, set-top box.
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. DC voltage booster circuit is characterized in that: comprise energy storage inductor, be the direct-current input power supplying of described energy storage inductor charging accumulation of energy, and be connected in the charge circuit of described energy storage inductor, be used to control the switching circuit that described energy storage inductor discharges and recharges; The electric energy that described energy storage inductor discharges is exported by dc power output end.
2. DC voltage booster circuit according to claim 1 is characterized in that: the control end connection processing device of described switching circuit, and the switch controlling signal of receiving processor output, the switch ways of switching circuit is connected in the charge circuit of described energy storage inductor.
3. DC voltage booster circuit according to claim 2 is characterized in that: the pwm signal output of the control end connection processing device of described switching circuit, the switch controlling signal of the PWM form of receiving processor output.
4. DC voltage booster circuit according to claim 1 is characterized in that: an end of described energy storage inductor connects described direct-current input power supplying, and the other end is by the switch ways ground connection of described switching circuit.
5. DC voltage booster circuit according to claim 4, it is characterized in that: in described switching circuit, include a NPN type triode, the base stage receiving key control signal of described triode, grounded emitter, collector electrode connects described energy storage inductor, and is connected with described dc power output end.
6. DC voltage booster circuit according to claim 1 is characterized in that: the electric energy that described energy storage inductor discharges is by preventing that pouring in down a chimney diode connects described dc power output end.
7. DC voltage booster circuit according to claim 6, it is characterized in that: be connected with a voltage stabilizing didoe at described dc power output end, the reverse breakdown voltage of described voltage stabilizing didoe equals to be connected the desired operating voltage of late-class circuit of described dc power output end.
8. DC voltage booster circuit according to claim 7 is characterized in that: also be connected with rc filter circuit at described dc power output end.
9. DC voltage booster circuit according to claim 8 is characterized in that: the filter capacitor that includes a plurality of difference appearance values parallel with one another in described rc filter circuit.
10. a television set is characterized in that: comprise as the described DC voltage booster circuit of each claim in the claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201897859U CN201717785U (en) | 2010-04-30 | 2010-04-30 | Direct current voltage booster circuit and television comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201897859U CN201717785U (en) | 2010-04-30 | 2010-04-30 | Direct current voltage booster circuit and television comprising same |
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| Publication Number | Publication Date |
|---|---|
| CN201717785U true CN201717785U (en) | 2011-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010201897859U Expired - Fee Related CN201717785U (en) | 2010-04-30 | 2010-04-30 | Direct current voltage booster circuit and television comprising same |
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| CN (1) | CN201717785U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946190A (en) * | 2012-10-23 | 2013-02-27 | 深圳市新国都技术股份有限公司 | Positive and negative voltage generating circuit |
| CN103218002A (en) * | 2013-04-18 | 2013-07-24 | 华瑞科学仪器(上海)有限公司 | Photoionization detector bias voltage generation circuit |
| CN106686330A (en) * | 2016-12-02 | 2017-05-17 | 安徽波维电子科技有限公司 | High-frequency head processing system based on DSP chip |
-
2010
- 2010-04-30 CN CN2010201897859U patent/CN201717785U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946190A (en) * | 2012-10-23 | 2013-02-27 | 深圳市新国都技术股份有限公司 | Positive and negative voltage generating circuit |
| CN103218002A (en) * | 2013-04-18 | 2013-07-24 | 华瑞科学仪器(上海)有限公司 | Photoionization detector bias voltage generation circuit |
| CN103218002B (en) * | 2013-04-18 | 2016-03-02 | 华瑞科学仪器(上海)有限公司 | Photoionization detector bias-voltage generating circuit |
| CN106686330A (en) * | 2016-12-02 | 2017-05-17 | 安徽波维电子科技有限公司 | High-frequency head processing system based on DSP chip |
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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: 20110119 Termination date: 20130430 |