CN201430531Y - Voltage stabilizing circuit and TV set with same - Google Patents
Voltage stabilizing circuit and TV set with same Download PDFInfo
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- CN201430531Y CN201430531Y CN2009200285759U CN200920028575U CN201430531Y CN 201430531 Y CN201430531 Y CN 201430531Y CN 2009200285759 U CN2009200285759 U CN 2009200285759U CN 200920028575 U CN200920028575 U CN 200920028575U CN 201430531 Y CN201430531 Y CN 201430531Y
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Abstract
The utility model relates to a voltage stabilizing circuit and a TV set with the same, which comprises an NPN triode and a clamping circuit; the base of the NPN triode is connected with the clamping circuit, is connected with a power input end through a current limiting resistor, and receives first DC power; the collector of the NPN triode is connected with the power input end, the emitter is connected with a power output end, and outputs second DC power with the voltage stabilized. Of course, an N-channel FET can be also adopted to replace the NPN triode to construct the voltage stabilizing circuit. The voltage stabilizing circuit has simple structure and stable performance, is constructed by discrete components and prevents the use of an integrated voltage stabilizing chip, thereby having low circuit cost. Applied to TV sets and other household electrical equipment, the utility model can reduce the integral cost, and improves the market competitiveness of household electrical products.
Description
Technical field
The utility model belongs to the power circuit technical field, specifically, and the television set that relates to a kind of DC-DC voltage stabilizing circuit and adopt described voltage stabilizing circuit design.
Background technology
For present most home appliances, its inside all is provided with the power circuit that the external communication civil power is changed into the required direct voltage of each functional module on the internal circuit board, such as the 220V electric main being changed into 5V, 8V, 12V direct voltage etc.When the described power circuit of design, each household electrical appliances production firm generally adopts rectification circuit, transformer and integrated voltage stabilizing chip to design, promptly change AC power into DC power supply by rectification circuit, the high-voltage DC power supply of rectification circuit being exported by transformer is converted to the multichannel low-voltage dc power supply then, and then, be each functional module power supply by the required direct-current working volts of integrated voltage stabilizing chip voltage stabilizing output back each functional module of level.
Voltage stabilizing circuit structure as shown in Figure 1, wherein, the front end direct voltage that+13V provides for transformer, after ground capacity C1 carries out Filtering Processing, export the input Vin of integrated voltage stabilizing chip N541 to, undertaken exporting after the DC-DC voltage stabilizing conversion, and then generate stable+5V direct voltage by voltage-stabiliser tube VD1 and filter capacitor C2, C3 by integrated voltage stabilizing chip N541, transfer to the functional module of back level needs+5V working power, for it provides operating voltage.
Adopt this voltage stabilizing circuit design cost height,, be unfavorable for the reduction of its complete machine cost, especially be not suitable in the response household electrical appliances are gone to the countryside the type of policy, promoting the use of for the fierce relatively household appliances of price competition.
The utility model content
The utility model adopts integrated voltage stabilizing chip to design the problem that causes circuit cost high in order to solve existing voltage stabilizing circuit, a kind of novel voltage stabilizing circuit design is provided, build the voltage stabilizing conversion that voltage stabilizing circuit carries out DC-DC by the employing discrete component, thereby reached the purpose of design that reduces circuit 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 clamped circuit, and the base stage of described NPN type triode connects clamped circuit, and connects power input by current-limiting resistance, receives first DC power supply; The collector electrode of NPN type triode connects described power input, and emitter connects power output end, second DC power supply after the output voltage stabilizing.
Further, the base stage of described NPN type triode is by storage capacitor ground connection.
In order to improve the electric current of described voltage stabilizing circuit out-put supply, the collector electrode of described NPN type triode connects described power input by the parallel branch that is composed in parallel by a plurality of resistance.
Preferably, described clamped circuit preferably adopts a reverse breakdown voltage to equal the amplitude of described second DC power supply and the voltage-stabiliser tube of the junction voltage sum between described NPN type transistor base-emitter is realized, wherein, the negative electrode of described voltage-stabiliser tube connects the base stage of described NPN type triode, plus earth.
Another design as voltage stabilizing circuit, voltage stabilizing circuit of the present utility model can also adopt a N channel field-effect pipe and a clamped circuit to make up, the grid of described field effect transistor connects clamped circuit, and connects power input by current-limiting resistance, receives first DC power supply; The drain electrode of field effect transistor connects described power input, and source electrode connects power output end, second DC power supply after the output voltage stabilizing.
Further, the grid of described field effect transistor is by storage capacitor ground connection.
Further again, the drain electrode of described field effect transistor connects described power input by the parallel branch that is composed in parallel by a plurality of resistance.
Further again, in described clamped circuit, include a voltage-stabiliser tube, its reverse breakdown voltage equals the amplitude of described second DC power supply and the junction voltage sum between described fet gate-source electrode, and the negative electrode of described voltage-stabiliser tube connects the grid of described field effect transistor, plus earth.
Based on above-mentioned voltage stabilizing circuit structure, the utility model also provides a kind of television set that adopts described voltage stabilizing circuit design, by on the TV set power plate, designing the voltage stabilizing circuit of forming by discrete components and parts such as NPN type triode (or N channel field-effect pipe) and clamped circuit, the DC power supply conversion of transformer output is generated the second required DC power supply of back level signal processing circuit, be back level signal processing circuit power supply, thereby broken away from the use of integrated voltage stabilizing chip, the complete machine hardware cost is minimized.
Compared with prior art, advantage of the present utility model and good effect are: simple in structure, the stable performance of voltage stabilizing circuit of the present utility model, owing to adopt discrete component to build, avoided the use of integrated voltage stabilizing chip, so circuit cost is lower.Be applied to reduce the complete machine cost in the home appliance such as television set, and then promote the market competitiveness of household appliances.
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 the circuit theory diagrams that have a kind of embodiment of the voltage stabilizing circuit that adopts integrated voltage stabilizing chip design now;
Fig. 2 is the circuit theory diagrams of a kind of embodiment of the voltage stabilizing circuit that proposes of the utility model;
Fig. 3 is the circuit theory diagrams of another embodiment of the voltage stabilizing circuit that proposes of the utility model;
Fig. 4 is the internal circuit theory diagram that adopts a kind of television set that voltage stabilizing circuit that the utility model proposed designs.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is done explanation in further detail.
The utility model is abandoned special-purpose integrated voltage stabilizing chip and is adopted discrete component to set up voltage stabilizing circuit, to reach the purpose of design that reduces hardware cost.Specifically, can adopt a NPN type triode (perhaps N channel field-effect pipe) to cooperate a clamped circuit to set up described voltage stabilizing circuit.It is clamped on a certain set point V1 to utilize clamped circuit will be input to the amplitude of first DC power supply of voltage stabilizing circuit, and export the base stage (the perhaps grid of N channel field-effect pipe) of NPN type triode to, control triode (perhaps field effect transistor) conducting, and then the amplitude stability of second DC power supply that makes emitter (the perhaps source electrode of the field effect transistor) output by triode is at V2=V1-V
BE(perhaps V2=V1-V
GS) amplitude on.So, can be according to the actual power requirement of late-class circuit, i.e. the amplitude V2 of second DC power supply determines the clamped amplitude of clamped circuit, i.e. set point V1, and then the parameter of each building block in the clamped circuit selected.
Elaborate the concrete composition structure and the operation principle thereof of described voltage stabilizing circuit below by two specific embodiments.
Embodiment one, referring to shown in Figure 2, comprises NPN type triode V201 and the clamped circuit of being made up of voltage-stabiliser tube VD201 in the voltage stabilizing circuit of present embodiment.The base stage of described NPN type triode V201 connects the negative electrode of voltage-stabiliser tube VD201, the plus earth of voltage-stabiliser tube VD201 on the one hand; Connect power input Vin by current-limiting resistance R3 on the other hand, receive first DC power supply of introducing by power input Vin, such as+13V.In order to protect NPN type triode V201; the voltage that affacts triode V201 base stage is set up after the input of first DC power supply gradually; and finally be stabilized to set point V1; be the reverse breakdown voltage value of voltage-stabiliser tube VD201, also be connected with a storage capacitor C101 in the base stage of described NPN type triode V201.The collector electrode of described NPN type triode V201 preferably connects power input Vin by the parallel branch that is composed in parallel by multichannel resistance, such as the parallel branch that composes in parallel by resistance R 4, R5, provide the purpose of design of enough electric currents with the output that is reached for whole voltage stabilizing circuit.The emitter of NPN type triode V201 connects power output end Vout by filter capacitor C102, C103.
Its operation principle is: when voltage stabilizing circuit shown in Figure 2 received first DC power supply, first DC power supply to storage capacitor C101 charging, raise the base potential of triode V201 by current-limiting resistance R3 gradually.When the anodal current potential of storage capacitor C101 is elevated to the reverse breakdown voltage (being set point V1) of voltage-stabiliser tube VD201, voltage-stabiliser tube VD201 reverse-conducting, the base potential of triode V201 is clamped and be stabilized on the V1.At this moment, triode V201 saturation conduction, its emitter current potential just is stabilized in V1-V
BEOn.Wherein, described V
BEWhen being NPN type triode V201 conducting, the PN junction voltage between its base stage and the emitter is generally 0.7V.At this moment, the amplitude of second DC power supply by power output end Vout output is V2=V1-V
BE
Illustrate: if the amplitude of first DC power supply that the power input Vin by voltage stabilizing circuit introduces is+13V, and the reverse breakdown voltage of voltage-stabiliser tube VD201 is 5.6V, V
BEDuring=0.7V, the amplitude V2=V1-V of second DC power supply by voltage stabilizing circuit output then
BE=5.6-0.7=4.9V exports it to late-class circuit, can be for needing in the late-class circuit+power supply of the functional module of 5V operating voltage.
Certainly, described clamped circuit also can adopt other version to realize, such as adopting a plurality of diodes to be composed in series.Requiring with clamped voltage magnitude is that 5.6V is an example, the diode of selecting 8 forward conduction voltage drops to be 0.7V is together in series, and anode connects the base stage of NPN type triode V201, minus earth, V1=0.7*8=5.6V then can reach the output effect of voltage stabilizing circuit shown in Figure 2 equally.The clamped circuit of present embodiment is not limited in above giving an example.
Embodiment two, referring to shown in Figure 3, in the present embodiment, can adopt a N channel field-effect pipe V101 to replace the NPN type triode V201 among Fig. 2 to set up described voltage stabilizing circuit.Wherein, the grid of N channel field-effect pipe V101 connects voltage-stabiliser tube VD201 and storage capacitor C101, and connects power input Vin by current-limiting resistance R3; The drain electrode of field effect transistor V101 connects power input Vin by the parallel branch that is composed in parallel by resistance R 4, R5, and source electrode connects power output end Vout by filter capacitor C102, C103 parallel with one another.
The operation principle of the voltage stabilizing circuit of present embodiment is with embodiment one, the amplitude V2=V1-V of second DC power supply by its power output end Vout output
GSWherein, V
GSDuring for N channel field-effect pipe V101 conducting, the PN junction voltage between its grid and the source electrode.Determine V1 according to the direct-current working volts amplitude that late-class circuit is required, and then to select reverse breakdown voltage be that the voltage-stabiliser tube of V1 designs described clamped circuit, can satisfy the power demands of late-class circuit.
Certainly, described clamped circuit also can adopt other version to realize, such as also adopting a plurality of diodes to be composed in series, present embodiment is not limited in above giving an example.
With the television set be below example elaborate embodiment one, two described voltage stabilizing circuits in television set concrete application and compare the good effect that conventional television is brought.
Embodiment three, and Fig. 4 comprises major parts such as power panel, front panel, decoding deck and audio plate for the internal circuit theory diagram of the television set of the described voltage stabilizing circuit of application.Wherein, described front panel is provided with the key circuit that receives the user key-press triggering command, receives the remote-control receiving circuit of the infrared remote-controlled signal that remote controller sends and the high frequency tuner circuit that is used to receive TV RF signals.Described high frequency tuner circuit is after receiving the radio television signal that TV station sends, with its demodulation, handle the back and generate the picture signal and the audio signal that are separated from each other and transfer to decoding deck by interface.Described decoding deck is provided with the master chip as whole television set core cell, is used for finishing carrying out tasks such as decoding processing to the centralized control of television set major function circuit and to picture signal; Described audio plate is provided with the audio processing unit, after the audio signal that receives is carried out power amplification etc. and handled, drives loud speaker output television field frame.
Above-mentioned front panel, decoding deck and audio plate needed various power supplies in running then provide by power panel output.Described power panel is provided with major parts such as ac power input end AC, current rectifying and wave filtering circuit, switch transformer and voltage stabilizing circuit.Outside electric main is transformed into high voltage direct current and exports the elementary of switch transformer to by the power panel that ac power input end AC introduces television set after current rectifying and wave filtering circuit is handled.Described switch transformer by its multichannel secondary coil high voltage direct current is converted to+B reference voltage and+8V ,+13V ,+the low-voltage dc power supply output of different amplitudes such as 24V, wherein one the tunnel or the multichannel low-voltage dc power supply can further generate the direct voltage of other amplitude by the voltage stabilizing circuit voltage stabilizing, such as+3.3V ,+5V ,+12V or the like, and then transfer on described front panel, decoding deck and the audio plate by interface, for each functional circuit on it provides stable dc supply.
By adopting discrete component to set up described voltage stabilizing circuit, can reduce the complete machine hardware cost of television set, improve the market competitiveness of tv product, go for equally in the circuit design of other 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, a kind of voltage stabilizing circuit is characterized in that: comprise a NPN type triode and a clamped circuit, the base stage of described NPN type triode connects clamped circuit, and connects power input by current-limiting resistance, receives first DC power supply; The collector electrode of NPN type triode connects described power input, and emitter connects power output end, second DC power supply after the output voltage stabilizing.
2, voltage stabilizing circuit according to claim 1 is characterized in that: the base stage of described NPN type triode is by storage capacitor ground connection.
3, voltage stabilizing circuit according to claim 2 is characterized in that: the collector electrode of described NPN type triode connects described power input by the parallel branch that is composed in parallel by a plurality of resistance.
4, according to claim 1 or 2 or 3 described voltage stabilizing circuits, it is characterized in that: in described clamped circuit, include a voltage-stabiliser tube, its reverse breakdown voltage equals the amplitude of described second DC power supply and the junction voltage sum between described NPN type transistor base-emitter, the negative electrode of described voltage-stabiliser tube connects the base stage of described NPN type triode, plus earth.
5, a kind of voltage stabilizing circuit is characterized in that: comprise a N channel field-effect pipe and a clamped circuit, the grid of described field effect transistor connects clamped circuit, and connects power input by current-limiting resistance, receives first DC power supply; The drain electrode of field effect transistor connects described power input, and source electrode connects power output end, second DC power supply after the output voltage stabilizing.
6, voltage stabilizing circuit according to claim 5 is characterized in that: the grid of described field effect transistor is by storage capacitor ground connection.
7, voltage stabilizing circuit according to claim 6 is characterized in that: the drain electrode of described field effect transistor connects described power input by the parallel branch that is composed in parallel by a plurality of resistance.
8, according to claim 5 or 6 or 7 described voltage stabilizing circuits, it is characterized in that: in described clamped circuit, include a voltage-stabiliser tube, its reverse breakdown voltage equals the amplitude of described second DC power supply and the junction voltage sum between described fet gate-source electrode, the negative electrode of described voltage-stabiliser tube connects the grid of described field effect transistor, plus earth.
9, a kind of television set comprises power circuit and signal processing circuit, includes transformer and voltage stabilizing circuit in described power circuit; It is characterized in that: in described voltage stabilizing circuit, include a NPN type triode and a clamped circuit, the base stage of described NPN type triode connects clamped circuit, and connect wherein one road dc voltage output end of transformer, first DC power supply of receiving transformer output by current-limiting resistance; The collector electrode of NPN type triode connects described dc voltage output end, and emitter connects signal processing circuit, second DC power supply after the output voltage stabilizing.
10, television set according to claim 9 is characterized in that: the base stage of described NPN type triode is by storage capacitor ground connection, and collector electrode connects described dc voltage output end by the parallel branch of being made up of a plurality of parallel resistances.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200285759U CN201430531Y (en) | 2009-06-23 | 2009-06-23 | Voltage stabilizing circuit and TV set with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200285759U CN201430531Y (en) | 2009-06-23 | 2009-06-23 | Voltage stabilizing circuit and TV set with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201430531Y true CN201430531Y (en) | 2010-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200285759U Expired - Fee Related CN201430531Y (en) | 2009-06-23 | 2009-06-23 | Voltage stabilizing circuit and TV set with same |
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| Country | Link |
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| CN (1) | CN201430531Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103545895A (en) * | 2013-11-04 | 2014-01-29 | 无锡新畅电子有限公司 | Battery pack balancing control panel |
| CN112804792A (en) * | 2021-04-13 | 2021-05-14 | 深圳市安规科技有限公司 | Dimming power module and LED dimming device of steady voltage power supply |
-
2009
- 2009-06-23 CN CN2009200285759U patent/CN201430531Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103545895A (en) * | 2013-11-04 | 2014-01-29 | 无锡新畅电子有限公司 | Battery pack balancing control panel |
| CN103545895B (en) * | 2013-11-04 | 2016-06-15 | 无锡新畅电子有限公司 | A kind of battery pack balancing panel |
| CN112804792A (en) * | 2021-04-13 | 2021-05-14 | 深圳市安规科技有限公司 | Dimming power module and LED dimming device of steady voltage power supply |
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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: 20100324 Termination date: 20120623 |