CN201887657U - High-low voltage converting power supply circuit adopting triode series connection structure - Google Patents
High-low voltage converting power supply circuit adopting triode series connection structure Download PDFInfo
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- CN201887657U CN201887657U CN2010206117590U CN201020611759U CN201887657U CN 201887657 U CN201887657 U CN 201887657U CN 2010206117590 U CN2010206117590 U CN 2010206117590U CN 201020611759 U CN201020611759 U CN 201020611759U CN 201887657 U CN201887657 U CN 201887657U
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Abstract
The utility model discloses a high-low voltage converting power supply circuit adopting a triode series connection structure, which comprises proportion current mirror circuit (1) and a proportion resistance network (2), and also comprises a triode series connection network (3), wherein the input of the proportion current mirror circuit (1) is a constant power supply source, the input of the proportion resistance network (2) is a standard current which is identical to the output of the proportion current mirror circuit (1), the proportion resistance network (2) consists of a plurality of proportion resistors, and the triode series connection network (3) is formed by connecting the emitting electrodes and collecting electrodes of a plurality of triodes in series. The high-low voltage converting power supply circuit is realized by directly adopting the triode circuit without any outer connected elements and special apparatus, and has no special requirements on the pressurization between the emitting electrode and collecting electrode of the triode, the number of the NPN triodes needed to be connected in series can be calculated by confirming the safety pressurization of the power supply voltage and the emitting electrode and collecting electrode of the triode, and the number of the NPN triodes is unlimited, so that the high-low voltage converting power supply circuit is wide in application range.
Description
Technical field
The utility model belongs to technical field of integrated circuits, and being specifically related to a kind of high pressure of triode cascaded structure that adopts changes low-voltage power circuit.
Background technology
The internal circuit of the integrated circuit of high voltage source power supply can be divided into high-tension circuit and two modules of low-voltage circuit.The former power supply is directly provided by external power supply, and the latter's power supply circuits need produce in chip, promptly external power supply is carried out conversion process, forms a constant low-tension supply and partly powers for inner low-voltage circuit.How producing this low-tension supply is the problem that each high voltage integrated circuit all must be faced.
The integrated circuit of high voltage source power supply, because the excursion of its external power supply is bigger, can both operate as normal under the general fluctuation that requires in the scope of 5V to tens volt.For the low-voltage circuit of its inside, then generally need more stable low-voltage circuit power supply, therefore, the stability and the reliability of low-voltage circuit power supply are most important to the steady operation of whole system.
At present, the major control method that high pressure changes low-voltage power circuit has two kinds, and a kind of is the circuit form that adopts similar LDO, adopts high pressure amplifier and reference voltage to produce changeless low-tension supply.The advantage of this method is that the low pressure out-put supply is more constant, but owing to adopt negative feedback structure, the mains voltage variations scope is big, reasons such as the load of low-tension supply is unfixing, the stable difficult of loop designed the bad vibration that is easy to generate with control, and this is unallowed to low-tension supply.Another is to adopt particular device such as JFET device, utilize its device property earlier high voltage source to be converted to low-tension supply, and then the control method that adopts general low-voltage circuit produces changeless low-tension supply, the advantage of this method is simple in structure, adopt the JFET device just can convert high voltage source to low relatively low-tension supply very easily, but be subject to the device property of JFET, its stream current capacity is generally not strong, need a lot of JFET parallel connections could satisfy designing requirement, increased area of chip, and the control of JFET device technology is difficult to guarantee.
In view of existing high pressure changes shortcoming, the electronic system requirement more and more higher to power supply of low-voltage power circuit, and, need to adopt a kind of new method solve the problem that high pressure changes the low-tension supply technical field to the factors such as consideration of chip cost.
The utility model content
The technical problems to be solved in the utility model provides a kind of reliable and stable high pressure changes low-voltage power circuit, and this circuit goes for the integrated circuit of any high voltage supply.Its technical scheme is as follows:
Power circuit is made up of proportional current mirror circuit, proportion resistor network and triode series network three parts, wherein
The input of proportional current mirror circuit is the current source of a constant magnitude, this input current by the current mirroring circuit of forming by the high voltage PMOS pipe produce size identical the multichannel output current, offer proportion resistor network generation reference voltage; The input of proportion resistor network is the equal-sized reference current of exporting with current mirroring circuit, form by multi-channel proportional resistance, the unitary resistance value of proportion resistor is R, the resistance value of proportion resistor network is according to the setting that concerns of first via unitary resistance value R, the second tunnel 2 times of unitary resistance value R, 4 times of unitary resistance value R of Third Road, by that analogy, N road resistance value is the twice of N-1 road resistance value; The triode series network is that the emitter and collector by N triode is composed in series, the emitter of first via triode is as the voltage output end of triode series network, the collector electrode of first via triode is connected to the emitter of the second road triode, the collector electrode of the second road triode is connected to the emitter of Third Road triode, by that analogy, the collector electrode of N-1 road triode is connected to the emitter of N road triode, and the collector electrode of N road triode is connected to supply voltage.
Number about series connection triode in the triode series network, be to decide according to the voltage difference VCE of the trouble free service of each transistor collector and emitter and the supply voltage VDD of entire chip, requirement according to triode VCE trouble free service voltage, the value of N should satisfy N〉(VDD/VCE), the VCE voltage of each triode is equal substantially in the circuit operate as normal, with the mode of connecting the supply voltage mean allocation is arrived between the collector and emitter of each triode.
Compared with prior art, the beneficial effects of the utility model are: because directly the employing transistor circuit is realized so do not needed external any element, also do not need special device.There is not specific (special) requirements for withstand voltage between the collector and emitter of triode yet, as long as the safety of the collector and emitter of the triode of realizing on affirmation supply voltage and the technology is withstand voltage, just can be in the hope of the connect number of NPN triode of needs, number is unrestricted, so the scope of application of the utility model circuit is very wide.
In addition, the most frequently used device realizes that high pressure changes low compression functions in the utility model circuit employing high-pressure process, particularly, has used the high voltage PMOS pipe, resistance, and triode, and used device is very simple.According to the difference of supply voltage supply voltage N five equilibrium, each triode bears the supply voltage of 1./N, work all is safe with respect to each triode like this, simultaneously, the current potential of the base stage of each triode also is controlled, control method be partial base potential than the high 1/N supply voltage of the first order, the base potential of the third level is than the high 1/N supply voltage in the second level, by that analogy.Final output voltage is the forward conduction voltage VBE that the base voltage of the first order deducts transistor base and emitter, because the base potential of the first order is fixed, the forward conduction voltage VBE of transistor base and emitter is about the 0.7V that fixes substantially, so output voltage is fixed, because the current amplification factor of triode is bigger, so the output current driving force is stronger, output voltage stabilization, antijamming capability is stronger.
Description of drawings
Fig. 1 is a principle schematic of the present utility model, and wherein, 1 is the proportional current mirror circuit, and 2 is the proportion resistor network, and 3 is the triode series network;
Fig. 2 is the utility model current mirroring circuit structural representation;
Fig. 3 is the structural representation of the utility model proportion resistor network;
Fig. 4 is the structural representation of the utility model triode series circuit;
Fig. 5 adopts tertiary current mirror circuit structural representation for the utility model;
Fig. 6 adopts the structural representation of three grades of proportion resistor networks for the utility model;
Fig. 7 adopts the structural representation of three grades of triode series circuits for the utility model;
Fig. 8 changes the low-voltage power circuit structural representation for the utility model adopts the integral high pressure of tertiary structure.
Embodiment
Engaging drawings and Examples below is described in further detail enforcement of the present utility model:
Shown in figure (1), the high pressure that the utility model provides changes low-voltage power circuit and is made up of with triode series circuit (3) three parts proportional current mirror circuit (1), proportion resistor network (2).Shown in figure (2): the input of proportional current mirror circuit (1) is the current source I0 of a constant magnitude, and this input current I0 passes through by high voltage PMOS pipe (P0, P1, P2, P3 ..., PN) current mirroring circuit of forming produce size identical multichannel output current (I0, I1, I2, I3 ... IN), offer proportion resistor network (2) and produce reference voltage.Shown in figure (3): the input of proportion resistor network (2) is the equal-sized reference current (I0 of current mirroring circuit (1) output, I1, I2, I3, IN), by multi-channel proportional resistance (R0, R1, R2, R3 ..., RN) form, the unitary resistance value of proportion resistor is R, the resistance value of proportion resistor network is got 1 times of unitary resistance value R, second resistance R 1 according to first resistance R 0 and is got the setting that concerns that 2 times of unitary resistance value R, the 3rd resistance R 3 get 4 times of unitary resistance value R, and by that analogy, N resistance R N gets N times of unit resistance.Shown in figure (4): triode series network (3) is by N triode (N1, N2, N3 ... NN) emitter and collector is composed in series, the emitter of the first triode N1 is as the voltage output end VOUT of triode series network (3), the collector electrode of the first triode N1 is connected to the emitter of the second triode N2, the collector electrode of the second triode N2 is connected to the emitter of the 3rd triode N3, by that analogy, the collector electrode of N-1 triode is connected to the emitter of N triode NN, and the collector electrode of N triode NN is connected to supply voltage VDD.
Embodiment:
Be 23V below with the supply voltage, proportional current mirror circuit (1), proportion resistor network (2), triode series circuit (3) adopts three grades of controls respectively, and low-tension supply is output as 5.3V concrete structure of the present utility model is described.
What circuit at first calculates needs realize the utility model circuit, suppose that supply voltage is 23V, 6V during the trouble free service voltage of the collector and emitter of triode in the high-pressure process, output voltage VO UT is 5.3V, the triode number that then needs is (23-5.3)/6, approximate 2.95, so with trouble free service under the maximum power supply voltage is prerequisite, need three triodes to connect to realize a 23V voltage to reduce to the output of 5.3V voltage, see figure (8) according to the circuit that the integral body of above inference design adopts the high voltage source of triode cascaded structure to change low-tension supply.
Shown in figure (5) is to adopt four high voltage PMOS pipes (P0, P1, P2, P3) current mirroring circuit of realizing, wherein grid end and the drain terminal of the 0th high voltage PMOS pipe P0 are connected together, and the input reference electric current is I0, other three road high voltage PMOSs pipes P1, P2, the grid end of P3 is connected to the grid end of the 0th high voltage PMOS pipe P0, high voltage PMOS pipe P0, P1, P2, the source end of P3 all meets supply voltage VDD, according to high voltage PMOS pipe saturation region current formula I=K(VGS-VTH)
2If the K value unanimity of these four high voltage PMOS pipes, the grid terminal potential is consistent with the voltage difference VGS of source terminal potential, then flow through the first electric current I 1=I0 of high voltage PMOS pipe P1, flow through the second electric current I 2=I0 of high voltage PMOS pipe P2, flow through the 3rd electric current I 3=I0 of high voltage PMOS pipe P3, four PMOS pipe (P0, P1, P2, P3) electric current equates that the big I of input reference electric current I 0 goes up the base voltage 6V that sets according to the first triode N1 among the big or small and figure (7) of unit resistance in the proportion resistor network among the figure (6) and determines that I0=6/R determines by formula.
Shown in figure (6) is to adopt three grades of proportion resistor (R1, R2, R3) realize three triode (N1 among the figure (7), N2, N3) base potential is provided with circuit, and the resistance value of first resistance R 1 is set at unit resistance R among the figure (6), and the voltage that is produced on first resistance R 1 by first electric current I of exporting among the figure (5) 1 is 6V, the resistance value of second resistance R 2 is set at 2 times of R among the figure (6), and the voltage that is produced on second resistance R 2 by output second electric current I 2 among the figure (5) is 12V; In like manner the resistance value of the 3rd resistance R 3 is set at 3 times of R among the figure (6), and the voltage that is produced on the 3rd R3 by output the 3rd electric current I 3 among the figure (5) is 18V.The 6V that produces respectively on first resistance R, 1, the second resistance R, 2, the three resistance R 3,12V, 18V voltage output to respectively among the figure (7) three series connection triodes (N1, N2, N3) base stage.
Shown in figure (7) is to adopt three triode (N1, N2, N3) the output voltage clamp circuit of connecting and realizing, from figure (5) and the circuit analysis of scheming (6) as can be known, the collector electrode of the 3rd triode N3 meets power supply potential 23V, base potential meets 18V, and the emitter voltage of the 3rd triode N3 is that base voltage deducts about the forward conduction voltage 0.7V of base stage and emitter, is roughly 17.3V.So for the 3rd triode N3, the voltage difference of its collector and emitter is 5.7V, satisfies the condition of its trouble free service.The second triode N2 among the figure (7) in like manner can analyze its base potential 12V, collector potential 17.3V, and emitter current potential 11.3V, the voltage difference of collector and emitter is 6V, satisfies the condition of its trouble free service equally; In like manner the first triode N1 of figure in (7) also is the same, base potential 6V, and collector potential 11.3V, emitter current potential 5.3V satisfies the condition of its trouble free service equally.The collector electrode output voltage VO UT of the first triode N1 equals the output voltage that 5.3V is exactly final low-tension supply.
Above example is to equal 23V according to supply voltage VDD, low-tension supply output VOUT equals 5.3V, triode trouble free service voltage 6V designs, and can follow above-mentioned method for the design under other supply voltage, low-tension supply output and the triode trouble free service voltage and be implemented.
Claims (2)
1. one kind is adopted the high pressure of triode cascaded structure to change low-voltage power circuit, comprises proportional current mirror circuit (1) and proportion resistor network (2), it is characterized in that also comprising triode series network (3),
The input of described proportional current mirror circuit (1) is the current source of a constant magnitude, and this input current produces the identical multichannel output current of size by the current mirroring circuit of being made up of the high voltage PMOS pipe, offers proportion resistor network (2) and produces reference voltage;
The input of described proportion resistor network (2) is the equal-sized reference current of exporting with current mirroring circuit (1), form by multi-channel proportional resistance, the unitary resistance value of proportion resistor is R, the resistance value of proportion resistor network is according to the setting that concerns of first via unitary resistance value R, the second tunnel 2 times of unitary resistance value R, 4 times of unitary resistance value R of Third Road, by that analogy, N road resistance value is the twice of N-1 road resistance value;
Described triode series network (3) is that the emitter and collector by N triode is composed in series, the emitter of first via triode is as the voltage output end of triode series network (3), the collector electrode of first via triode is connected to the emitter of the second road triode, the collector electrode of the second road triode is connected to the emitter of Third Road triode, by that analogy, the collector electrode of N-1 road triode is connected to the emitter of N road triode, and the collector electrode of N road triode is connected to supply voltage.
2. the high pressure of triode cascaded structure according to claim 1 changes low-voltage power circuit, it is characterized in that described triode series network (3) is the number N that decides the triode of going here and there according to the supply voltage VDD of the voltage difference VCE of the trouble free service of each transistor collector and emitter and entire chip, requirement according to triode VCE trouble free service voltage, the value of N satisfies N〉VDD/VCE, the VCE voltage of each triode is equal substantially in the circuit operate as normal, with the mode of connecting the supply voltage mean allocation is arrived between the collector and emitter of each triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206117590U CN201887657U (en) | 2010-11-18 | 2010-11-18 | High-low voltage converting power supply circuit adopting triode series connection structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010206117590U CN201887657U (en) | 2010-11-18 | 2010-11-18 | High-low voltage converting power supply circuit adopting triode series connection structure |
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| CN201887657U true CN201887657U (en) | 2011-06-29 |
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| CN2010206117590U Expired - Lifetime CN201887657U (en) | 2010-11-18 | 2010-11-18 | High-low voltage converting power supply circuit adopting triode series connection structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102468750A (en) * | 2010-11-18 | 2012-05-23 | 无锡芯朋微电子有限公司 | High voltage to low voltage power circuit adopting triode series connection structure |
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2010
- 2010-11-18 CN CN2010206117590U patent/CN201887657U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102468750A (en) * | 2010-11-18 | 2012-05-23 | 无锡芯朋微电子有限公司 | High voltage to low voltage power circuit adopting triode series connection structure |
| CN102468750B (en) * | 2010-11-18 | 2014-02-26 | 无锡芯朋微电子股份有限公司 | High voltage to low voltage power circuit adopting triode series connection structure |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110629 Effective date of abandoning: 20140226 |
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| RGAV | Abandon patent right to avoid regrant |