CN203193602U - Double-triode output-stage circuit - Google Patents
Double-triode output-stage circuit Download PDFInfo
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- CN203193602U CN203193602U CN 201220645208 CN201220645208U CN203193602U CN 203193602 U CN203193602 U CN 203193602U CN 201220645208 CN201220645208 CN 201220645208 CN 201220645208 U CN201220645208 U CN 201220645208U CN 203193602 U CN203193602 U CN 203193602U
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Abstract
Provided is a double-triode output-stage circuit. Load current is dispersed to a plurality of power triodes at an output stage; each power triode is adapted to transfer current under collector-emitter voltages in different ranges. The double-triode output-stage circuit comprises the following components that: a first power triode which is provided with a large ballast resistor, wherein the large ballast resistor transfers current between an input end and an output end of the circuit when input and output voltage difference is large; and a second first power triode which is provided with a small ballast resistor, wherein the ballast resistor transfers current between the input end and the output end of the circuit when input and output voltage difference is small. The two triodes both respond to single control signals, and provide buffering to prevent any one of the triodes from exceeding a common control point; and an independent current-limiting protection circuit is provided for each triode and comprises a feedback system capable of decreasing a current-limiting value of the current-limiting protection circuit when the input and output voltage difference achieves a threshold value.
Description
Technical field
The present invention relates to a kind of double-triode valve output-stage circuit, the output stage of a voltage regulator or must transmit the circuit of load current in low or high input/output voltage difference.More particularly, the invention still further relates to a circuit that is used between a plurality of pliotrons spread loads electric current, each is optimised comes delivered current under a different range input/output voltage difference.
Background technology
Power device, as pressurizer and mains switch, often must provide electric current to load when being operated under the high input/output voltage difference, need an output-stage power triode that under so high voltage difference, transmits stable load current, and do not need emitting because the thermal instability of triode and the risk that the cause thermal damage triode is crossed in some areas.In order to prevent that pliotron is damaged in this case, the steady resistance on the pliotron emitter is used to stablize the electric current of triode.
Steady resistance improves by the voltage drop of transistor emitter and proportional with the electric current of triode transmission.In some cases, the increase of this voltage may improve the minimum operating voltage of a power device.A suitable ballast pliotron for example, when transmitting low current under a high input/output voltage difference, should have enough steady resistances to reduce about 100-500 millivolt voltage.In this case, the voltage drop of the increase of passing through triode that is caused by steady resistance is not showing the function that reduces power device, because generally can surpass the voltage drop of whole pliotron in the input/output voltage difference of this device operation.Yet when higher electric current and lower voltage difference, steady resistance can arrange undesirable restriction at power device.The resistance of transistor emitter increases the minimum of saturation voltage.Voltage drop by steady resistance when high electric current may be between 200 millivolts and 2 volts, thereby cause in the triode that uses the increase of the minimum operating voltage of pliotron and power device.
For this reason, when circuit working during in low input/output voltage difference, in the output-stage power device that transmits high electric current, the pliotron that has a low steady resistance is desirable.Yet so pliotron is unsettled under high input/output voltage difference, therefore, if separately as output stage, the serious working range of power-limiting device.
In view of the foregoing, it is desirable providing an output stage as voltage regulator or mains switch for power device, makes its existing lower minimum operating voltage under high input/output voltage difference have the ability of the stable load current of safe transfer again.
Summary of the invention
An output stage is provided for power device such as voltage regulator or mains switch, makes its existing lower minimum operating voltage under high input/output voltage difference have the ability of safe transfer steady load electric current again, this is purpose of the present invention.
Technical solution of the present invention
Advantage of the present invention is finished by a circuit, wherein the 1st pliotron has a big steady resistance, be used for input and output side delivered current at circuit when the input/output voltage difference is very high, when voltage difference was very low, the 2nd pliotron had a little steady resistance and comes delivered current.Two triodes all respond mutually with a single control signal, and provide buffering to prevent that arbitrary triode from surpassing public control point.Each triode all has been provided independent current-limiting protection circuit, comprises one when the input/output voltage difference reaches threshold value, can reduce the foldback system of current-limiting circuit cut-off current.
Double-triode valve output-stage circuit described in the invention, its 1st and the 2nd triode is used at the input and output side delivered current; The terminal that is connected to the 1st and the 2nd triode is used for regulating separately the electric current that transmitted by the 1st and the 2nd triode and as the voltage difference of input and output, the 1st and the 2nd triode is at the electric current that transmits under the voltage difference of different amplitudes between input and the output.
The terminal that double-triode valve output-stage circuit described in the invention is used for regulating separately by the electric current of the 1st and the 2nd triode transmission comprises the resistance that is connected between the 1st transistor emitter and the output, because the 1st triode is used for preventing transmitting a large amount of electric currents between input and output side under first range of voltages difference; The terminal that is used for limiting the drive current that flows to the 2nd transistor base and is connected to the 2nd transistor base is used for preventing that the 2nd triode from transmitting a large amount of electric currents under the second range of voltages difference; Therefore, the 1st triode is at the electric current that transmits under the second range of voltages difference between input and the output, and the 2nd triode is at the electric current that transmits under the first range of voltages difference between input and the output.
Further, input and output comprise input and the output of a three terminal regulator respectively.
Further, be connected the 1st and the 2nd steady resistance on the 1st and the 2nd triode, wherein the 1st steady resistance is less than the 2nd steady resistance.
Further, the 1st and the 2nd triode respectively has a steady resistance, and the steady resistance of the 1st triode is better than the steady resistance of the 2nd triode; The the 3rd and the 4th triode has a common base driving node that is used for receiving control signal; Be connected to the 4th transistor emitter and be connected to the 2nd pliotron base stage at the 2nd node; Be connected to the terminal that is used for limiting the electric current that is transmitted by the 1st and the 2nd triode on the 1st and the 2nd node, the 1st triode transmits all load currents under the first range of voltages difference, and the 2nd triode transmits all load currents under the second range of voltages difference.
Documents
Patent of invention: output circuit and multiplex output circuit, application number: 200810083558.5.
Description of drawings
Fig. 1 is the schematic diagram behind the circuit reduction, and principle of the present invention has been described;
Fig. 2 is the schematic diagram in conjunction with voltage stabilizing circuit of the present invention;
Fig. 3 is the operating curve figure of Fig. 2 voltage stabilizing circuit.
Embodiment
With reference to Fig. 1, the circuit diagram of simplification have low saturation voltage and under a high input/output voltage difference in the ability of input and output delivered current.At input 100, circuit is connected with a power supply, and at output 102, circuit is connected with a load.Triode 104 is pliotrons that have big steady resistance 106.Triode 108 is pliotrons that have little steady resistance 110.Triode 104 and 106 all is that control point 112 is on triode 114 and 116 common base by a single control signal control.
Under a low input/output voltage difference, when the voltage at control point 112 is driven when very high by used control signal, electric current is transmitted between input 100 and output 102 by triode 108.Being used for the control signal at control point 112 has reduced the electric current that is transmitted by triode 116, the current drives triode 108 that is transmitted by current source 118.Control signal also reduces the electric current that is transmitted by triode 114.Yet steady resistance 106 big on the triode 104 has limited the electric current that is transmitted by triode 104 under low input/output voltage difference.Triode 104 can't transmit any amount of electric current because its big steady resistance is driven to saturation condition under low input/output voltage difference.Therefore, under low input/output voltage difference, the unwanted place of big steady resistance, all load current will be walked around the big steady resistance of triode 104 substantially, and load current will be transmitted by triode 108 and its low steady resistance 110.
Because the cushioning effect of triode 114, the saturation of triode 104 can obviously not improve the load at control point 112.Along with triode 104 is saturated, the operating current that triode 114 receives still less from current source 116, the load at control point 112 has only a small variation to take place.
Along with the input/output voltage difference increases, current limit circuit 120, it is poor to detect input/output voltage, when voltage difference surpasses the conduction that certain threshold voltage will limit triode 108 electric currents.The threshold voltage of mentioning is with reference to the puncture voltage of Zener diode 122.Current limliting is finished to terminal 102 by diode 124 by shifting triode 108 base stages.Because the cushioning effect of triode 116, the conduction that triode 108 is restricted and the not obvious load that influences control point 112.
Because the input/output voltage difference increases, by the conduction of restriction triode 108, avoided the damage to triode 108.Because existing all load currents are all transmitted by triode 104 substantially, under the input/output voltage difference that so increases, the current delivery that is connected in the load of terminal 102 will continue.Triode 104 is because its big steady resistance 106 can be in safe operation under the high voltage differential.Along with voltage difference or electric current continue to increase, power grade can reach triode 104, even big steady resistance 106 is arranged, also will become unstable.In order to prevent this unsteadiness, it is poor that current-limiting circuit 126 detects input/output voltage, when predetermined threshold value voltage reaches, shifts the base drive electric current away from triode 104 by diode 128.The threshold voltage of current-limiting circuit 126 is with reference to the puncture voltage of Zener diode 130 and 132, so be higher than the threshold voltage of current-limiting circuit 122 by current-limiting circuit 126 preset threshold voltages.
Above-described circuit has illustrated working method, and according to principle of the present invention, load current is distributed between the pliotron that can react to a public control signal, and transmits load current under the input/output voltage difference of different range.Though described circuit has only two pliotrons, praiseworthy is according to principle of the present invention, use the pliotron of some steady resistances with greater number can reach more complicated prioritization scheme, and poor by the input/output voltage that is operated under the continuous narrow range of biasing triode.
In addition, should be appreciated that after considering circuit shown in Figure 2 and appended literal that because the input/output voltage difference changes, other method can be used to change and be dispersed in the independently load current between the pliotron.For example, an optimised triode transmits load current under high input/output voltage difference, can avoid transmitting electric current under the low-voltage difference by its steady resistance, as shown in Figure 1, or according to other current-limiting circuit shown below.On the other hand, certainly to thank those in artistry, under the low-voltage difference, do not need to be avoided delivered current as a triode, transmit simultaneously at the triode of the optimization of delivered current under the low-voltage difference and the triode of the optimization of delivered current under high voltage differential by one as the load current under the low-voltage difference, especially the electric current that transmits as the latter hour.
The low dropout voltage voltage stabilizing circuit 200 of three ends is concrete enforcement of the present invention as shown in Figure 2.Load current transmits between input 202 and output 204 by pliotron 206 and 208, responds mutually with a control signal that is applied on the control point 210 by control circuit 212.Control circuit 212 is traditional the cell voltage reference of cloth sieve and an error amplifier circuit.Also can be with other well-known bandgap voltage reference circuit.Control circuit 212 is connected to output 204 and adjustable side 205 in a kind of traditional mode, and these terminals also are connected with 209 with non-essential resistance 207.Control circuit 212 produces a reference voltage at output 204 and adjustable side 205, and as described below, controlling the voltage at control point 210 and keeping the voltage by non-essential resistance 207 by triode 206 and 208 electric currents that transmit is reference voltage.
Pliotron 206 and 208 is traditional structures, includes a series of compositions in parallel.Each part is made up of an independent base region by a lot of independent ballast emission stripeds.Resistance 211 and 213 represents the steady resistance of triode 206 and 208 independent transmission stripeds respectively.Zone in the triode 208 also can be stablized alone.Resistance 217 has represented the steady resistance in triode 208 zones.Generally, total steady resistance of triode 206 much smaller than triode 208.For example, comprised that in the triode of specializing 206 of first-selection forming 112 independently launches striped, these stripeds are divided into the four big zones that every part has 28 stripeds.Each striped has a steady resistance that is approximately 1.1 ohm.These zones are unstable.Triode 208 comprises that 60 are independently launched striped, and these stripeds are divided into the two big zones that every part has 30 stripeds.Each striped has a steady resistance that is approximately 50 ohm.Stabling current is come by two resistance that are approximately 1.7 ohm in each zone.Steady resistance in Fig. 2 and the preference value of other composition will be listed in following table.
Under low input/output voltage difference, electric current transmits between input 202 and output 204 by triode 206, and respond mutually by control circuit 212 and the control signal that is applied on the control point 210, as follows, when the base drive voltage of triode 218 during near the voltage of output 204, triode 218 operations and the electric current that is provided by current source 220 is provided.The voltage of triode 218 emitters approximately is the diode drop on output 204 voltages, will cause triode 222 work.Triode 222 drives triode 224 conversely, changes to drive the voltage of signals grade and driving is provided for the base stage of triode 206.Resistance 227 and 229 and diode 231 provides a fraction of negative feedback to come the stabilized driving circuit for triode 222 from the base stage of triode 206.
The electric current that transmits through triode 206 is limited to guarantee that by current-limiting circuit triode 206 is operated in its safe operation scope.Triode 206 a part of collector currents are detected by resistance 226, and a low-resistance value is wherein arranged, and are preferably divided by the metal part of triode 206 collector electrodes to form.The voltage that forms by resistance 226 gives one to comprise that triode 228,230,232,234,236 and 238 current-limiting circuit provide a detection signal.Connect the diode of triode 228, link to each other with current source 223, the base drive of a low AC impedance is provided for triode 230 and 232.When triode 206 no currents transmitted, triode 230 and 232 transmitted the electric current that a value by emitter resistance 240 separately and 242 is set the order of magnitude.Be more preferably, these resistances equate that therefore when the zero output electric current, triode 230 and 232 transmits the continuous electric current that equates.Be provided for triode 234 and 236 through triode 230 and 232 electric currents that transmit.Triode 234 current values need be selected, and its emitting area is than high several times of the current value of the triode 236 that is connecting diode, and are normally saturated and make triode 238 disconnect.
The increase of the electric current that transmits along with triode 206, the voltage drop by resistance 226 increases in proportion.This causes that the electric current that transmits through triode 232 reduces.When the ratio through triode 230 and 232 electric currents that transmit equated with the ratio of triode 234 and 236 emitter area, current limliting began.In this, triode 234 is no longer saturated and will produce enough collector emitter voltages and start triode 238, drive current is separated from the base stage of triode 222, thereby limited the electric current that is transmitted by triode 206.Increase the gain in current limliting loop by resistance 244 through the electric current of triode 238 transmission.Electric capacity 246 provides frequency compensation to come stable loop.
Triode 247, Zener diode 248 and resistance 250,252,254,256 and 244 form a feedback network, when the voltage difference between input 202 and the output 204 is increased to greater than threshold voltage, will cause that the current limliting loop will be limited in a low current value by the electric current that triode 206 transmits.Under the input/output voltage difference that is lower than Zener diode 248 puncture voltages, there is not electric current through resistance 250,252 and 254. Resistance 244 and 256 electric currents that transmission is transmitted by triode 234 emitters.Be more preferably, resistance 244 and 256 has little resistance, like this, strides the voltage of resistance and can ignore under low input/output voltage difference.
When the input/output voltage difference surpassed the puncture voltage of Zener diode 248, electric current was transmitted by resistance 250,252 and 254, and by resistance 244 and 256, thereby improve the voltage of striding resistance 244 and 256.By increasing the voltage of triode 234 emitters, the required current ratio of current-limiting circuit reduces.Therefore, current limliting occurs under the lower electric current.The required threshold voltage of feedback network is determined by the puncture voltage of Zener diode 248.Along with the input/output voltage difference is increased to when surpassing by resistance 250,252 and 254 preset threshold voltages, the ratio of cut-off current reduces.
When being increased to puncture voltage greater than Zener diode 248 along with the input/output voltage difference, cross over the voltage continuous decrease of resistance 252 up to triode 247 basic emitter junction forward bias, triode 247 begins conduction.In this, feed back to that the electric current of resistance 244 and 256 is more effective to be set by resistance 254, will reduce with a faster speed when cut-off current increases under the input/output voltage difference like this.Breakpoint in this current limliting is temperature sensitive.Being used for the voltage of preposition triode 247 bases-emitter junction reduces with about 2 millivolts every degree centigrade speed.Therefore, at high temperature, the free temperature coefficient of each part can cause a cut-off current under the given input/output voltage difference to increase in voltage stabilizing circuit, and the breakpoint in the current limliting occurs under the low input/output voltage difference to guarantee that triode is operated in the place of safety.
The selected working range restriction that comes a safety of regulation in triode 206 I-E characteristics of the puncture voltage of resistance 250,252 and 254 value and Zener diode 248.More particularly, because the low steady resistance of triode 206, its value should be conducted electricity under high input/output voltage difference by the selected triode 206 that stops, and is secondary breakdown with protection triode 206.
Triode 206 is under low input/output voltage difference in the delivered current, and triode 208 is used for delivered current under high input/output voltage difference.Under low input/output voltage difference, control circuit 212 drives the voltage at control point 210 near the voltage of output 204, and this will cause triode 206 delivered current between input 202 and output 204.Under so low input/output voltage difference, the voltage that is provided by current source 260 is provided the voltage of triode 258 emitters, and voltage approximately is a diode drop more than output 204 voltages.This undertension is with turn-on transistor 262 and 208.Therefore, under these input/output voltage differences, the triode 206 preferential load currents that transmit, triode 208 is spaced.
When the input/output voltage difference reaches threshold voltage, triode 206 transmitted and began restriction this moment, and the voltage of terminal 204 reduces gradually.Control circuit 212 detects this situation, can compensate by the corresponding voltage that increases control point 210, enough turn-on transistor 262 and 208 when the voltage at control point 210 reaches predetermined value like this, triode 208 begins to transmit the electric current between terminal 202 and 204.This moment, the big steady resistance of triode 208 caused triode 208 saturated, thus the electric current that restriction is transmitted by triode 208.Triode 208 is still in saturation condition, on the input/output voltage difference scope of the threshold voltage of its voltage when beginning greater than triode 206 current limlitings.In this scope, the increase of input/output voltage difference causes being increased by the saturation current that triode 208 transmits.
When being increased to above this scope along with the input/output voltage difference, and during triode 206 current limlitings, triode 208 is no longer saturated, and the electric current that is transmitted by triode 208 may increase up to it by hereinafter described current-limiting circuit restriction.The current ratios that transmitted by triode 206 and 208 change the function as the input/output voltage difference.When triode 206 transmitted a large amount of electric currents, the input/output voltage difference was enough damaged triode 206, and triode 208 transmits roughly all electric currents between input 202 and output 204.
Triode 262 and 208 is connected to provide high current gain and buffering as Darlington.Drive current is provided in the Darlington combination by current source 260 and triode 264.Triode 264 has two collector electrodes, and one is connected to the base stage of triode 264 and the base stage of triode 262, and another is connected to the collector electrode of triode 266.When base current was transmitted by triode 262, the voltage that is connected the resistance 268 between triode 262 and 266 base stages reduced.Along with base current increases, triode 266 is switched on, and electric current is transmitted by triode 264 base-emitter circuit and resistance 270.The paired collector electrode delivered current of triode 264 increases with functional form as the base current that is transmitted by triode 262 to the base stage of triode 262.Along with being increased by triode 208 load transmitted electric currents, therefore triode 264 provides the drive current that increases in a part of Darlington combination.This under higher load current is discharging current source 260 under whole drive current tasks required by the Darlington combination, thereby allow to be diminished by the quiescent current that current source 260 transmits, can also when load current changes, reduce the variation by the electric current of triode 258 transmission.
The electric current that is transmitted by triode 208 is subjected to the restriction by triode 272,274 and 276 current-limiting circuits of forming.The triode 272 that connects diode links to each other with current source 278, a bias point is provided for triode 274.The emitter of triode 272 is connected to the potential-divider network of being made up of steady resistance 213 and 217 by resistance 280.Along with the increase of the electric current that is transmitted by triode 208, the emitter voltage of triode 272 increases, and this has improved the base voltage of triode 274 conversely again.When triode 274 came turn-on transistor 276 by the enough electric currents of resistance 282 transmission, current limliting began.In the current limliting process, triode 276 migration currents make it the base stage away from triode 262, thereby have limited the electric current that is transmitted by triode 208.
In order to remedy the negative temperature coefficient of triode 276 base-emitter junction voltages, the voltage under the polarity opposite temperature coefficients is produced by resistance 286.The voltage that the electric current that is transmitted by current source 284 produces has positive temperature coefficient.
By steady resistance 217, resistance 280,282 and 286 and the cut-off current determined of the value of current source 284 rule of thumb selectedly comes to guarantee that triode 208 is operated in its safety operation area.
By triode 288, the feedback network that Zener diode 290 and resistance 292 are formed, when the input/output voltage difference reaches the threshold voltage of determining in Zener diode 290 puncture voltages, cause the electric current that is transmitted by triode 208 when current-limiting circuit is limited in low current value.Electric current by the feedback network transmission makes triode 206 determine the voltage on triode 288, can increase along with the input/output voltage difference.When the input/output voltage difference that increases caused triode 288 conductings, triode 288 transmitted the electric current of being determined by resistance 292 values.This current feedback will cause that to the emitter of triode 272 voltage of emitter increases, so need the pressure drop of lower steady resistance 217 to cause current limliting.Be more preferably, the selected triode 208 that prevents of the value of the puncture voltage of resistance 292 and Zener diode 290 conducts electricity under high input/output voltage difference, thereby protection triode 208 avoids because the destruction that second breakdown causes.
This circuit comprises that also resistive element is to transmit leakage current.The pull-up resistor 225 anti-leakage currents of going up cause that triode 224 has sealed the back delivered current at triode 224.Equally, pull down resistor 294 guarantees that triode 208 be not closed the back by the leakage current conducting.
The concrete first-selected component value of Fig. 2 voltage stabilizing circuit is as follows:
Component value
Steady resistance 211:1.1 ohm
Steady resistance 213:50 ohm
Steady resistance 217:1.7 ohm
Current source 220:200 microampere
Current source 223:100 microampere
Resistance 225:1K ohm
Resistance 226:0.14 ohm
Resistance 227:50 ohm
Resistance 229:10 ohm
Resistance 240:3K ohm
Resistance 242:3K ohm
Resistance 244:10 ohm
Electric capacity 246:70 pico farad
Zener diode 248:7 lies prostrate (puncture voltage)
Resistance 250:16K ohm
Resistance 252:1.8 ohm
Resistance 254:10K ohm
Resistance 256:90 ohm
Current source 260:200 microampere
Resistance 268:500 ohm
Resistance 270:500 ohm
Current source 278:200 microampere
Resistance 280:200 ohm
Resistance 282:3K ohm
Current source 284:200 microampere
Resistance 286:1K ohm
Zener diode 290:7 lies prostrate (puncture voltage)
Resistance 292:10.6K ohm
Resistance 294:1K ohm
Described above Fig. 2 circuit, will combine description with Fig. 3 below, only when triode 206 current limlitings, triode 206 and 208 transmits a large amount of load currents simultaneously when input/output voltage poor (approximately being the 3-20 volt).When being not current limliting under the voltage difference of triode 206 in this scope, triode 208 is non-conductive.When voltage difference is lower than this scope, have only triode 206 to transmit a large amount of load currents, when voltage difference surpasses this scope, have only triode 208 to transmit a large amount of load currents.Certainly should be appreciated that these artistries that are applied in the circuit can be configured, so that when input/output voltage differs from first scope (for example 1-20 volt), two triodes conduct electricity simultaneously, but under higher voltage difference, have only a triode conduction.In addition, circuit can be configured such triode in first scope (for example 1-20 volt) conduction, and another is in second scope (for example 20-40 volt) conduction, between first and second scopes without any individual overlapping part.
Fig. 3 has shown how Fig. 2 voltage stabilizing circuit is operated in three working temperatures.Curve 300,302 and 304 representation temperature respectively is-55 degrees centigrade, 25 degrees centigrade, and 150 degrees centigrade.The power supply that is connected to input 202 and output 204 is shorted to ground.When the input/output voltage difference was lower than 3 volts, output current was transmitted by triode 206.When voltage difference is higher than 3 volts, delivered current when triode 208 is limited at triode 206.When voltage difference during at about 3 volts to 20 volts, the electric current that is transmitted by triode 208 is restricted to about 1 ampere, and remaining output current is transmitted by triode 206.Under higher voltage difference, triode 206 is restricted to an extremely low electric current and most electric current is transmitted by triode 208.When voltage difference reached about 40 volts, triode 208 was closed to prevent to damage.Fig. 3 illustrated when a high power supply be employed and output by load during by effective short circuit ground connection, present invention can make voltage stabilizing circuit or mains switch have low saturation voltage so that an output current to be provided.
Therefore, one is distributed in the circuit of novelty that a plurality of power transistors and each be used to transmit the electric current of best voltage range at different collector electrode-emitters to load current and is described.Though the present invention better is embodied in a plurality of elements and is connected on other element and is revealed, an a twist of the wrist will be praised, namely extra element may be embedded on the Connection Element of other demonstration when not breaking away from represented spiritual of the present invention.In addition, element and other value and parameter may be modified.Another kind of a twist of the wrist can be praised that also i.e. the present invention can be implemented by some outside describing, especially in the circuit except voltage stabilizing circuit described above merged, quantity bipolar or the MOS power transistor can be revised as required.Described embodiment is for illustration purpose rather than restriction, and the present invention is only limited by the claims.
Claims (5)
1. double-triode valve output-stage circuit, it is characterized in that: the 1st and the 2nd triode is used at the input and output side delivered current; The terminal that is connected to the 1st and the 2nd triode is used for regulating separately the electric current that transmitted by the 1st and the 2nd triode and as the voltage difference of input and output, the 1st and the 2nd triode is at the electric current that transmits under the voltage difference of different amplitudes between input and the output.
2. double-triode valve output-stage circuit according to claim 1, it is characterized in that: the terminal that is used for regulating separately by the electric current of the 1st and the 2nd triode transmission comprises the resistance that is connected between the 1st transistor emitter and the output, because the 1st triode is used for preventing transmitting a large amount of electric currents between input and output side under first range of voltages difference; The terminal that is used for limiting the drive current that flows to the 2nd transistor base and is connected to the 2nd transistor base is used for preventing that the 2nd triode from transmitting a large amount of electric currents under the second range of voltages difference; Therefore, the 1st triode is at the electric current that transmits under the second range of voltages difference between input and the output, and the 2nd triode is at the electric current that transmits under the first range of voltages difference between input and the output.
3. double-triode valve output-stage circuit according to claim 1, it is characterized in that: input and output comprise input and the output of a three terminal regulator respectively.
4. according to the described double-triode valve output-stage circuit of claim 1, it is characterized in that: be connected the 1st and the 2nd steady resistance on the 1st and the 2nd triode, wherein the 1st steady resistance is less than the 2nd steady resistance.
5. according to the described double-triode valve output-stage circuit of claim 1, it is characterized in that: the 1st and the 2nd triode, a steady resistance is respectively arranged, the steady resistance of the 1st triode is better than the steady resistance of the 2nd triode; The the 3rd and the 4th triode has a common base driving node that is used for receiving control signal; Be connected to the 4th transistor emitter and be connected to the 2nd pliotron base stage at the 2nd node; Be connected to the terminal that is used for limiting the electric current that is transmitted by the 1st and the 2nd triode on the 1st and the 2nd node, the 1st triode transmits all load currents under the first range of voltages difference, and the 2nd triode transmits all load currents under the second range of voltages difference.
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| CN 201220645208 CN203193602U (en) | 2012-11-29 | 2012-11-29 | Double-triode output-stage circuit |
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| CN 201220645208 CN203193602U (en) | 2012-11-29 | 2012-11-29 | Double-triode output-stage circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102970023A (en) * | 2012-11-29 | 2013-03-13 | 苏州硅智源微电子有限公司 | Double triode output stage circuit |
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| CN102970023A (en) * | 2012-11-29 | 2013-03-13 | 苏州硅智源微电子有限公司 | Double triode output stage circuit |
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Granted publication date: 20130911 Termination date: 20131129 |