CN202261593U - Switching tube protection circuit, power supply circuit and television - Google Patents
Switching tube protection circuit, power supply circuit and television Download PDFInfo
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- CN202261593U CN202261593U CN2011203412838U CN201120341283U CN202261593U CN 202261593 U CN202261593 U CN 202261593U CN 2011203412838 U CN2011203412838 U CN 2011203412838U CN 201120341283 U CN201120341283 U CN 201120341283U CN 202261593 U CN202261593 U CN 202261593U
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Abstract
The utility model discloses a switching tube protection circuit, a power supply circuit and a television. The switching tube connects a direct current voltage and a load and is used for controlling the direct current voltage to supply power to the load. A resistance capacitor (RC) delay circuit for controlling connection degree of the switching tube to change slowly is connected between the direct current voltage and the switching tube. The RC delay circuit is connected with a control circuit, and the control circuit receives switch control signals and controls the RC delay circuit to charge or discharge according to received switch control signals. The switching tube protection circuit, the power supply and the television use a delay effect of the RC circuit to control the switching tube to be connected slowly so as to have an effective restrain effect on current passing through the switching tube, avoid damage of the switching tube caused by overlarge current, effectively protect the switching tube, and improve safety and stability of the circuit. The switching tube protection circuit is applied to design of a power supply circuit of electrical appliances such as televisions and the like, can improve reliability of operation of the circuit, and improve the quality of the whole machine of products.
Description
Technical field
The utility model belongs to the power control circuit technical field, specifically, relates to a kind ofly be used to suppress the switching tube protective circuit of overshoot current and adopt said switching tube protective circuit design of power circuit and based on the television set of said power circuit design.
Background technology
In present a lot of home appliances, its power module can need through transformer conversion output two-way or the above voltage of two-way after civil power is carried out rectification, Filtering Processing usually.With the LCD TV product is that example describes, and referring to shown in Figure 1, wherein one road voltage V1 is as standby power, and holds concurrently and be the inner signal main board power supply of liquid crystal TV set; Other one the tunnel or a few road voltage V2 export to power amplifier or liquid crystal display screen even load through switching tube, be said electric.When the machine system standby, be merely the signal main board power supply as the voltage V1 of standby power, other one the road or a few road voltage V2 do not export.And when the television system remote-controlled start-up, the signal mainboard sends start control signal STB, makes other each road voltage V2 also be with load by the switch controlled power circuit, reaches the purpose that reduces stand-by power consumption thus.But, after the signal mainboard sends start control signal STB, owing to can be connected with energy-storage travelling wave tubes such as electric capacity usually at the outlet side of switching tube; Give in the process of power amplifier, the power supply of liquid crystal display screen even load at the switch controlled power circuit; Electric current through switching tube output will carry out momentary charge to these electric capacity, because electric capacity has empty short characteristic at powered on moment, therefore can produce very big transient current; Moment produces bigger power, thereby very easily causes the damage of switching tube.
To the problems referred to above, present solution mainly contains two kinds: a kind of is to prevent that through the parameter index that improves switching tube it is breakdown, but this method can not fundamentally solve the problem of overshoot current; A kind of in addition is to be employed in start control signal output ends and being used to control the mode of setting up the RC delay circuit between the triode of said switching tube break-make and suppress overshoot current, and as shown in Figure 1, physical circuit makes up referring to shown in Figure 2.
Among Fig. 2, when system for TV set was started shooting, the signal mainboard sent start control signal STB through 7 chargings of 3 pairs of capacitor C of resistance R, treats that the voltage at capacitor C 7 two ends reaches after the conducting voltage of triode Q1, triode Q1 conducting.Because triode Q1 works in the amplification region, along with the increase gradually of its base current, the electric current of its collector electrode also increases gradually, so the grid step voltage of P type metal-oxide-semiconductor Q2 (being aforesaid switching tube) will be dragged down gradually.Treat the gate-source voltage V of metal-oxide-semiconductor Q2
GSAfter being reduced to its threshold voltage, metal-oxide-semiconductor Q2 is open-minded, and drain current I1 begins to flow through.Before metal-oxide-semiconductor Q2 gets into the saturation region, along with V
GSThe lasting reduction of voltage, electric current I 1 slowly increase, and this moment, the voltage at capacitor C 6 two ends also slowly increased, and had realized the inhibition to the overshoot electric current.Drain-source step voltage V as metal-oxide-semiconductor Q2
DSReduce to minimum value, when arriving the saturation region, the complete conducting of metal-oxide-semiconductor Q2 begins to be electric.
In this process, what play retarding action mainly is resistance R 3 and capacitor C 7, but because the threshold voltage of triode Q1 is very little, and it is very short that therefore charging reaches time of this threshold voltage, can not control the service time of overshoot electric current and triode Q1 accurately.Even increase the capacity of capacitor C 7, also can reach the threshold voltage of triode Q1 rapidly, make the entire circuit conducting, therefore to the inhibition ability of overshoot current extremely thin a little less than.
Summary of the invention
The purpose of the utility model is to provide a kind of switching tube protective circuit, to suppress overshoot current, prevents that switching tube from damaging because of electric current is excessive.
For solving the problems of the technologies described above, the utility model adopts following technical scheme to be achieved:
A kind of switching tube protective circuit, said switching tube is connected between direct voltage and the load, is used to control the power supply of direct voltage to load; Between said direct voltage and switching tube, be connected with one be used to control said switching tube the RC delay circuit that slowly changes of conducting degree; Said RC delay circuit connects control circuit; Said control circuit receiving key control signal, and control said RC delay circuit charging according to the switch controlling signal that receives and perhaps discharge.
Further, said switching tube is a P type metal-oxide-semiconductor, and its source electrode connects direct voltage; Drain electrode connects storage capacitor, and is connected with described load; Electric capacity in the said RC delay circuit is connected between the source electrode and grid of said metal-oxide-semiconductor, and the resistance in the RC delay circuit is connected between the grid and said control circuit of metal-oxide-semiconductor.
Preferably, between the drain electrode of said metal-oxide-semiconductor and grid, preferably be connected one road electric capacity again, as little feedback with stable voltage through switching tube output.
For the electric charge of preserving in the RC delay circuit is released; The anode that the positive pole of electric capacity in the said RC delay circuit is connected a diode through bleeder resistance; The negative electrode of said diode connects the grid of metal-oxide-semiconductor, and the resistance in said diode and the RC delay circuit is in parallel.
Further again; In said control circuit, include a switch element; The switch ways of said switch element is connected between RC delay circuit and the ground; The control end of switch element receives described switch controlling signal, realizes the control that discharges and recharges to the RC delay circuit through control switch element break-make.
Preferably, said switch element preferably adopts a NPN type triode, and the collector electrode of said triode connects the resistance in the RC delay circuit, grounded emitter, and base stage receives described switch controlling signal.
Based on above-mentioned switching tube protective circuit structure; The utility model provides the said switching tube protective circuit of a kind of employing design of power circuit again; Said power circuit is exported at least one road direct voltage; Comprise switching tube, said switching tube is connected between direct voltage and the load, is used to control the power supply of direct voltage to load; Between said direct voltage and switching tube, be connected with one be used to control said switching tube the RC delay circuit that slowly changes of conducting degree; Said RC delay circuit connects control circuit; Said control circuit receiving key control signal, and control said RC delay circuit charging according to the switch controlling signal that receives and perhaps discharge.
Further; Said power circuit adopts the reverse exciting topological structure to design; Output multi-channel DC voltage, wherein one road direct voltage is that standby voltage directly connects load, all the other each road direct voltages connect load through one tunnel described switching tube and switching tube protective circuit separately.
Based on above-mentioned power circuit; The utility model also provides a kind of television set that adopts said power circuit design; Comprise mainboard, display screen and be the power circuit of said mainboard and display screen power supply, said power circuit is exported at least one road direct voltage, comprises switching tube; Said switching tube is connected between direct voltage and the load, is used to control the power supply of direct voltage to load; Between said direct voltage and switching tube, be connected with one be used to control said switching tube the RC delay circuit that slowly changes of conducting degree; Said RC delay circuit connects control circuit; Said control circuit receiving key control signal, and control said RC delay circuit charging according to the switch controlling signal that receives and perhaps discharge.
Further, said control circuit connects mainboard, receives the start/Opportunity awaiting control for linear signal of mainboard output, promptly described switch controlling signal.
Compared with prior art; The advantage and the good effect of the utility model are: the utility model is through setting up the RC circuit between the output voltage of power supply and switching tube; Utilize the slow conducting of time-lag action control switch pipe of RC circuit, and then the electric current that flows through switching tube has been played effective inhibitory action, prevented the damage that switching tube causes because of electric current is excessive; Effectively protect switching tube, strengthened the fail safe and the stability of circuit.Be applied to strengthen the power circuit reliability of operation in the power circuit design of electric equipments such as television set, improve the complete machine quality of product.
After the detailed description in conjunction with advantages the utility model execution mode, other characteristics of the utility model and advantage will become clearer.
Description of drawings
Fig. 1 is that existing power supply module is for suppressing a kind of schematic block circuit diagram that the switching tube overshoot current designs;
Fig. 2 is the circuit theory diagrams of power module shown in Figure 1;
Fig. 3 is the schematic block circuit diagram of a kind of embodiment of the switching tube protective circuit that proposes of the utility model;
Fig. 4 is the circuit theory diagrams of a kind of embodiment of switching tube protective circuit among Fig. 3;
Fig. 5 is the circuit theory diagrams that adopt a kind of embodiment of switching tube protective circuit design of power circuit shown in Figure 4.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the utility model is done explanation in further detail.
Embodiment one, and referring to shown in Figure 3, the switching tube protective circuit of present embodiment is in order to suppress overshoot current; Between direct voltage V2 that power supply is provided for load and switching tube, set up the RC delay circuit; Utilize the charging time-delay characteristics of RC circuit, the control switch pipe is slowly conducting in the system boot process, and the electric current that flows through switching tube is slowly raise; Thereby avoided the generation of overshoot current, effectively protected switching tube.The sequential that discharges and recharges for the RC circuit; Can adopt a control circuit to be connected on the described RC circuit, and then the hardware designs mode that gets into charging process or cut off the power circuit control RC circuit discharging of RC circuit according to the switch controlling signal control RC power on circuitry that system produces realize.In the process of control RC circuit charging, switching tube is controlled open-minded gradually, and control direct voltage V2 is an electric; In the process of control RC circuit discharging, switching tube is controlled to be turn-offed gradually, stops the power supply of direct voltage V2 to load, on the basis of guaranteeing the switching tube work safety, has realized the switch control to load thus, has satisfied the job requirement of system.
Fig. 4 is that a kind of physical circuit of said switching tube protective circuit is set up form, and wherein, switching tube adopts a P type metal-oxide-semiconductor Q2; The RC delay circuit adopts a resistance R 5 and a capacitor C 8 to form; Control circuit adopts a NPN type triode Q1 to carry out circuit design.The source electrode of metal-oxide-semiconductor Q2 is connected output voltage V 2, and drain electrode connects load, and through storage capacitor C10 ground connection.Capacitor C 8 is connected between the source electrode and grid of metal-oxide-semiconductor Q2, resistance R 5 is connected between the collector electrode of grid and triode Q1 of metal-oxide-semiconductor Q2, the grounded emitter of triode Q1, base stage receiving key control signal.For television system, said switch controlling signal specifically refers to the start/Opportunity awaiting control for linear signal STB of mainboard output, affacts through current-limiting resistance R7 on the base stage of said triode Q1, with control triode Q1 break-make.
With the tv product is the operation principle that example is set forth said switching tube protective circuit: after the signal mainboard of television set sent start control signal STB, the base voltage of triode Q1 was drawn high to threshold voltage and conducting, set up the power circuit of RC circuit.At this moment, 2 pairs of capacitor C 8 of output voltage V are charged, and in the process that the voltage of capacitor C 8 raises gradually, the grid step voltage of P type metal-oxide-semiconductor Q2 is dragged down gradually, its gate-source voltage V
GSReduce gradually.Gate-source voltage V as metal-oxide-semiconductor Q2
GSWhen being reduced to the threshold voltage of metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q2 begins conducting, and drain current I1 begins to flow through, and before getting into the saturation region, along with gate-source voltage V
GSLasting reduction, drain current I1 slowly increases, and is storage capacitor C10 charging, and then the voltage at storage capacitor C10 two ends is also slowly raise, and has realized the inhibition to the overshoot electric current.Metal-oxide-semiconductor Q2 drain voltage slowly increases, and also is that drain-source voltage slowly reduces, and when being reduced to minimum value, metal-oxide-semiconductor Q2 arrives the saturation region, the complete conducting of metal-oxide-semiconductor Q2 this moment, beginning powering load.
In order to make the voltage Vout that outputs to load more stable, present embodiment preferably is connected one tunnel capacitor C 9 again between the drain electrode of metal-oxide-semiconductor Q2 and grid, as shown in Figure 4, forms feedback branch.When metal-oxide-semiconductor Q2 conducting had drain current I1 to flow through, drain current I1 was capacitor C 9 chargings simultaneously.In the process that capacitor C 9 is charged; Increased the electric current that flows through resistance R 5 simultaneously; The grid voltage of metal-oxide-semiconductor Q2 is risen, further slowed down the opening speed of metal-oxide-semiconductor Q2, thereby the growth rate of metal-oxide-semiconductor Q2 drain current I1 is also slowed down thereupon; Realize the steady change of drain current I1, further suppressed the generation of overshoot current.
When system closedown, in order to realize releasing fast of store charge in the capacitor C 8, present embodiment adopts a bleeder resistance R6 and a diode D1 design discharge circuit, and is as shown in Figure 4.Bleeder resistance R6 is connected across the two ends of RC circuit, promptly is connected between the collector electrode of positive pole and triode Q1 of capacitor C 8; Diode D1 is connected in parallel on the two ends of resistance R 5, and negative electrode connects the grid of metal-oxide-semiconductor Q2.When the signal mainboard of television set sent Opportunity awaiting control for linear signal STB, the base voltage of triode Q1 reduced, and when being lower than the conducting voltage of triode, triode Q1 turn-offs.At this moment, the electric charge in the capacitor C 5 is controlled the D1 conducting and is discharged through the anode that bleeder resistance R2 exports diode D1 to.The discharge of capacitor C 5 makes the grid voltage of metal-oxide-semiconductor Q2 raise on the one hand, and when surpassing the threshold voltage of metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q2 turn-offs, and cuts off the power supply of output voltage V 2 to load; On the other hand, for delaying to open, start charging next time prepares.
Present embodiment adopts the charging time-lag action control switch pipe of RC circuit to slow down the speed of opening power supply circuits, thereby plays the purpose that the containment powered on moment produces impulse current, has protected switching tube effectively, has prolonged the useful life of switching tube.In actual application, through changing the parameter value of resistance R 5 in the RC circuit and capacitor C 8, i.e. the ON time of the charging interval of scalable RC circuit, and then adjustment switching tube finally obtains the effect of optimal inhibition overshoot current.
Certainly; When the said switching tube protective circuit of design, said control circuit also can adopt other switch elements design realizations except that NPN type triode Q1, such as controllable silicon, relay etc.; Only need the switch ways of switch element is connected between RC delay circuit and the ground; Control end connected system mainboard, and under the effect of the switch controlling signal that system board sends, realize quick break-make, can accomplish circuit design.
The switching tube protective circuit that present embodiment proposed is applied in the design of power circuit,,, and then accomplishes switching on and shutting down control electric equipment through of the power supply of switch controlled power circuit to load such as the power circuit that adopts the reverse exciting topological structural design.
With widely used flyback power supply circuit in the household appliances such as television set is that example describes, and referring to Fig. 3, shown in Figure 5, comprises transformer T1 and rectification, filter circuit.Because the direct voltage through flyback power supply circuit output generally includes two-way or more than the two-way; Therefore need be at the secondary design multichannel secondary coil of transformer T1, the alternating voltage through each road secondary coil conversion output carries out shaping via one tunnel rectification, filter circuit separately to be handled the back (rectification circuit can adopt rectifier diode VD1, VD2 to design realization; Filter circuit can adopt the Π type filter network of being made up of inductance L 1/L2 and capacitor C 1/C2, C3/C4 to realize), each is with the required direct-current working volts of electric loading in the output system.In the multi-channel DC voltage through the output of said power circuit, wherein one the tunnel as the required standby voltage of system, direct voltage V1 for example, and directly the connected system mainboard is that the stand-by circuit in the system is supplied power when system standby; All the other each road direct voltages; Such as direct voltage V2; The switching tube and the switching tube protective circuit that can be proposed through one road present embodiment separately connect back level load; Such as power amplifier in the television system or display screen etc., only, system is electric after sending the start control signal, to realize the switching on and shutting down control of complete machine.
Certainly; The switching tube protective circuit that present embodiment proposed also can be applied in except that the flyback power supply circuit other and need use switching tube and switching tube in make and break process, to be subject in the design of power circuit that overcurrent impacts or other hardware circuits, and present embodiment does not specifically limit this.
Should be noted that; Above-mentioned explanation is not to be the restriction to the utility model; The utility model also is not limited in above-mentioned giving an example; Variation, remodeling, interpolation or replacement that those skilled in the art are made in the essential scope of the utility model also should belong to the protection range of the utility model.
Claims (10)
1. switching tube protective circuit, said switching tube is connected between direct voltage and the load, is used to control the power supply of direct voltage to load; It is characterized in that: between said direct voltage and switching tube, be connected with one be used to control said switching tube the RC delay circuit that slowly changes of conducting degree; Said RC delay circuit connects control circuit; Said control circuit receiving key control signal, and control said RC delay circuit charging according to the switch controlling signal that receives and perhaps discharge.
2. switching tube protective circuit according to claim 1 is characterized in that: said switching tube is a P type metal-oxide-semiconductor, and its source electrode connects direct voltage; Drain electrode connects storage capacitor, and is connected with described load; Electric capacity in the said RC delay circuit is connected between the source electrode and grid of said metal-oxide-semiconductor, and the resistance in the RC delay circuit is connected between the grid and said control circuit of metal-oxide-semiconductor.
3. switching tube protective circuit according to claim 2 is characterized in that: between the drain electrode of said metal-oxide-semiconductor and grid, also be connected with another electric capacity.
4. switching tube protective circuit according to claim 2; It is characterized in that: the positive pole of electric capacity connects the anode of a diode in the said RC delay circuit through bleeder resistance; The negative electrode of said diode connects the grid of metal-oxide-semiconductor, and the resistance in said diode and the RC delay circuit is in parallel.
5. according to each described switching tube protective circuit in the claim 2 to 4; It is characterized in that: in said control circuit, include a switch element; The switch ways of said switch element is connected between RC delay circuit and the ground, and the control end of switch element receives described switch controlling signal.
6. switching tube protective circuit according to claim 5 is characterized in that: said switch element is a NPN type triode, and the collector electrode of said triode connects the resistance in the RC delay circuit, grounded emitter, and base stage receives described switch controlling signal.
7. a power circuit is exported at least one road direct voltage, it is characterized in that: comprise switching tube and like the described switching tube protective circuit of each claim in the claim 1 to 6.
8. power circuit according to claim 7; It is characterized in that: said power circuit adopts the reverse exciting topological structure; Output multi-channel DC voltage; Wherein one road direct voltage is that standby voltage directly connects load, and all the other each road direct voltages connect load through one tunnel described switching tube and switching tube protective circuit separately.
9. television set comprises mainboard, display screen and is the power circuit of said mainboard and display screen power supply that it is characterized in that: said power circuit adopts like the described power circuit of each claim in claim 7 or 8.
10. television set according to claim 9 is characterized in that: said control circuit connects mainboard, receives the expression start of mainboard output or the switch controlling signal of standby.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203412838U CN202261593U (en) | 2011-09-13 | 2011-09-13 | Switching tube protection circuit, power supply circuit and television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203412838U CN202261593U (en) | 2011-09-13 | 2011-09-13 | Switching tube protection circuit, power supply circuit and television |
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| Publication Number | Publication Date |
|---|---|
| CN202261593U true CN202261593U (en) | 2012-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203412838U Expired - Fee Related CN202261593U (en) | 2011-09-13 | 2011-09-13 | Switching tube protection circuit, power supply circuit and television |
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| CN (1) | CN202261593U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401510A (en) * | 2013-07-24 | 2013-11-20 | 三维通信股份有限公司 | Power amplifier with hot plugging function |
| CN106910475A (en) * | 2017-04-28 | 2017-06-30 | 四川长虹电器股份有限公司 | New type liquid crystal television carries on the back lamp drive circuit |
| CN109980909A (en) * | 2019-01-21 | 2019-07-05 | 广州金升阳科技有限公司 | A kind of transformer leakage inductance energy absorption circuit and its control method |
| CN111697823A (en) * | 2019-03-14 | 2020-09-22 | 深圳Tcl新技术有限公司 | Power switch circuit |
| CN114257180A (en) * | 2021-11-26 | 2022-03-29 | 中国电子科技集团公司第二十九研究所 | Low-power-consumption satellite-borne solid-state power amplifier control circuit |
| WO2023115548A1 (en) * | 2021-12-24 | 2023-06-29 | 广州视源电子科技股份有限公司 | Power switch control circuit and electrical appliance |
-
2011
- 2011-09-13 CN CN2011203412838U patent/CN202261593U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401510A (en) * | 2013-07-24 | 2013-11-20 | 三维通信股份有限公司 | Power amplifier with hot plugging function |
| CN103401510B (en) * | 2013-07-24 | 2016-08-10 | 三维通信股份有限公司 | A kind of power amplifier of band warm connection function |
| CN106910475A (en) * | 2017-04-28 | 2017-06-30 | 四川长虹电器股份有限公司 | New type liquid crystal television carries on the back lamp drive circuit |
| CN106910475B (en) * | 2017-04-28 | 2019-06-14 | 四川长虹电器股份有限公司 | New type liquid crystal television back light driving circuit |
| CN109980909A (en) * | 2019-01-21 | 2019-07-05 | 广州金升阳科技有限公司 | A kind of transformer leakage inductance energy absorption circuit and its control method |
| CN111697823A (en) * | 2019-03-14 | 2020-09-22 | 深圳Tcl新技术有限公司 | Power switch circuit |
| CN114257180A (en) * | 2021-11-26 | 2022-03-29 | 中国电子科技集团公司第二十九研究所 | Low-power-consumption satellite-borne solid-state power amplifier control circuit |
| WO2023115548A1 (en) * | 2021-12-24 | 2023-06-29 | 广州视源电子科技股份有限公司 | Power switch control circuit and electrical appliance |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| 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: 20120530 Termination date: 20190913 |