CN101677209B - DC/DC converter and current induction circuit thereof - Google Patents
DC/DC converter and current induction circuit thereof Download PDFInfo
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- CN101677209B CN101677209B CN2008102115644A CN200810211564A CN101677209B CN 101677209 B CN101677209 B CN 101677209B CN 2008102115644 A CN2008102115644 A CN 2008102115644A CN 200810211564 A CN200810211564 A CN 200810211564A CN 101677209 B CN101677209 B CN 101677209B
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Abstract
The invention relates to a DC/DC converter and a current induction circuit thereof. The current induction circuit comprises a power transistor, a first level shifter, an operational transconductance amplifier, a second level shifter and a false transistor. The power transistor is provided with a first endpoint and a power control endpoint, wherein the power control endpoint is coupled with the control voltage. The first level shifter is coupled with the first endpoint, and pulls up the first endpoint of the first end point to the operation voltage. The operational transconductance amplifier is coupled with the first level shifter, and converts the operation voltage into the operation current. The second level shifter is coupled with the operational transconductance amplifier and pulls down the operation voltage to the voltage of the first endpoint. The false transistor is provided with a false control endpoint and a third endpoint, wherein, the false control endpoint is coupled with the control voltage; and the third endpoint is coupled with the second level shifter and is provided with the voltage the same as the first endpoint.
Description
Technical field
The invention relates to a kind of current-sensing circuit, and particularly relevant for a kind of current-sensing circuit that is used for the DC/DC transducer of current-mode (current-mode).
Background technology
The direct current of general current-mode (current-mode) to direct current (DC/DC) transducer in, can have a current-sensing circuit usually, it comprises operational amplifier (OP), in order to according to load current induced current to be provided.Through the use of operational amplifier, the electric current of equal proportion just can produce via the operation of power transistor (power MOS) and false transistor (dummy MOS).
Yet because power transistor and false transistorized operating voltage are very low usually, therefore when operational amplifier was desired to operate in fast state, its input must remain on the accurate position of low-voltage/electric current on the contrary, so that can't expectably operate.In addition, the action that operational amplifier also need compensate causes the operational amplifier more can't be as expectedly operating in state at a high speed.Thus, current-sensing circuit just can't correctly provide induced current.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of current-sensing circuit, makes current-sensing circuit not receive the restriction of general operational amplifier, normally operates in state at a high speed.
Another object of the present invention is that a kind of DC/DC transducer is being provided, in order to the problem of improving that current-sensing circuit wherein need compensate and can't high speed operation.
To achieve these goals, propose a kind of current-sensing circuit in one embodiment of the invention, comprise a power transistor, one first level shifter, an operation transconductance amplifier, one second level shifter and a false transistor.Power transistor has one first end points, one second end points and power control terminal point, and wherein second end points couples one first voltage source, and the power control terminal point couples a control voltage.First level shifter couples first end points, and is pulled up to an operating voltage in order to the voltage with first end points.Operation transconductance amplifier couples first level shifter, and in order to operating voltage is converted into an operating current.Second level shifter couples operation transconductance amplifier, and in order to operating voltage is drawn the voltage of reducing to first end points.False transistor has a false control end points, one the 3rd end points and one the 4th end points; Wherein false control end points couples control voltage; The 3rd end points couples second level shifter and has the voltage identical with first end points, and the 4th end points couples first voltage source.
To achieve these goals, propose a kind of DC/DC transducer in another embodiment of the present invention, comprise a control circuit, and switch a switch and a current-sensing circuit.Control circuit is in order to export a pulse drive signal.Diverter switch is to start through pulse drive signal, makes an inductance produce an inductive current via input voltage charging back.Current-sensing circuit is to export a current sensing signal in order to the detecting inductive current; Wherein current sensing signal is superimposed on the slope compensation that a slope equalizer exports, and the current sensing signal after the stack converts a feedback signal into to control control circuit with slope compensation.Current-sensing circuit comprises a power transistor, one first level shifter, an operation transconductance amplifier, one second level shifter and a false transistor.Power transistor has one first end points, one second end points and power control terminal point, and wherein second end points couples one first voltage source, and the power control terminal point couples a control voltage.First level shifter couples first end points, and is pulled up to an operating voltage in order to the voltage with first end points.Operation transconductance amplifier couples first level shifter, and in order to operating voltage is converted into an operating current.Second level shifter couples operation transconductance amplifier, and in order to operating voltage is drawn the voltage of reducing to first end points.False transistor has a false control end points, one the 3rd end points and one the 4th end points; Wherein false control end points couples control voltage; The 3rd end points couples second level shifter and has the voltage identical with first end points, and the 4th end points couples first voltage source.
According to technology contents of the present invention; The application of aforementioned current-sensing circuit can provide induced current under the use that does not need general operational amplifier; More because need not use general operational amplifier and electric capacity, and the action of correlative compensation, therefore can successfully operate under the state at a high speed.
Description of drawings
Fig. 1 is according to the direct current of a kind of current-mode of the embodiment of the invention main circuit calcspar to direct current transducer;
Fig. 2 is the sketch map according to a kind of current-sensing circuit of the embodiment of the invention.
[primary clustering symbol description]
100:DC/DC transducer 102: control circuit
104: diverter switch 106,200: current-sensing circuit
108: slope equalizer 202: power transistor
206: the second level shifters of 204: the first level shifters
208: false transistor 220,254: current mirror
250: operation transconductance amplifier 252: differential pair circuit
256: current source
Embodiment
Fig. 1 shows according to the direct current of a kind of current-mode (current-mode) of the embodiment of the invention main circuit calcspar to direct current (DC/DC) transducer.DC/DC transducer 100 consists essentially of inductance L 1, diode D1, control circuit 102, diverter switch 104, current-sensing circuit 106 and slope equalizer 108.Inductance L 1 has one first end and one second end, and its first end is electrically coupled to input voltage V
In, its second end then is electrically coupled to the anode of diverter switch 104 and diode D1.When diverter switch 104 started, inductance L 1 can be via input voltage V
InProduce an inductive current i after the charging
LAnd output voltage V
OutThen be to produce in the negative electrode of diode D1.
In addition, current-sensing circuit 106 receiving inductance current i
L, and export a current sensing signal CS.108 of slope equalizers are to produce a slope compensation SS, and to be superimposed upon on the current sensing signal CS, wherein slope compensation SS and the current sensing signal CS after the stack can convert a feedback signal FS into, in order to control circuit 102 is controlled.In one embodiment, slope compensation SS and current sensing signal CS all are that the form with electric current appears, and can convert a voltage (being feedback signal FS) into after the stack of two electric currents, and control circuit 102 is controlled.102 of control circuits are a pulse drive signal of output pulse width modulation (PWM) form therefore, in order to start diverter switch 104.
Fig. 2 shows the sketch map according to a kind of current-sensing circuit of the embodiment of the invention.Current-sensing circuit 200 comprises a power metal oxide semiconductor field-effect transistor (power MOSFET) 202,1 first level shifter (level shifter) 204, one operation transconductance amplifier (OTA) 250, one second level shifter 206, a current mirror 220 and a false mos field effect transistor (dummy MOSFET) 208.In the present embodiment, power transistor 202 is a nmos pass transistor, and its grid (power control terminal point) is coupled to a control voltage Vg, and its source electrode is coupled to a voltage source PVSS, and its drain electrode then is to be coupled to first level shifter 204.First level shifter 204 is coupled to the drain electrode of power transistor 202, and the voltage (being VDIN) of the drain electrode of power transistor 202 is pulled up to an operating voltage VN.The operation transconductance amplifier 250 and first level shifter 204 are coupled to node P; And be coupled to node Q with second level shifter 206; And convert operating voltage VN the operating current i1 of the node Q that flows through into, wherein node Q has and voltage VN identical operations voltage VP.Second level shifter 206 is coupled to operation transconductance amplifier 250, and voltage VP is drawn reduce to voltage VCPY, makes voltage VCPY identical with voltage VDIN.220 of current mirrors are to make mirror image (mirroring) in order to the operating current i1 to the node Q that flows through to handle, and with the flow through current i 2 of first level shifter 204 of generation, voltage VDIN are pulled up to voltage VN.
In the present embodiment, false transistor 208 is another nmos pass transistors, and its drain electrode is coupled to second level shifter 206 and has voltage VCPY, and its source electrode then is coupled to voltage source PVSS.It should be noted that at this false transistor 208 is to be designed to and power transistor 202 couplings, makes that the grid/source voltage of two transistor (is V
GD) identical.Thus, because voltage VCPY is identical with voltage VDIN, therefore the grid voltage of false transistor 208 just can be identical with the grid voltage Vg of power transistor 202.
In the design of general analog integrated circuit, transistor is that the form with many finger-like (multi-finger) appears; In other words, the transistor of large-size is that transistor by several reduced sizes is connected in parallel and processes.In one embodiment, false transistor 208 has width/height (W/L) and is the ratio of S, and power transistor 202 then is (M=1000) to appear with 1000 fingers (finger), and wherein each finger all has the ratio that W/L is S.In other words, the size of power transistor 202 is 1000 times of false transistor 208.Therefore, in real circuit layout, in fact can exist 1000 nmos pass transistors to be connected in parallel, forming single power transistor 202, and each nmos pass transistor all has the size that ratio W/L is S.As stated; Because the operating point of power transistor 202 is identical with the operating point of false transistor 208; And the size of power transistor 202 is several times of false transistor 208, so the electric current I p of the power transistor 202 of flowing through, and can become the several times of the electric current I d of the false transistor 208 of flowing through.
With reference to circuit as shown in Figure 2; First level shifter 204 can also comprise a PMOS transistor MP3; Its grid is coupled to the drain electrode of power transistor 202, and its drain electrode is coupled to voltage source PVSS, and its source electrode then is to be coupled to node P with operation transconductance amplifier 250 and current mirror 220.On the other hand, second level shifter 206 can also comprise a PMOS transistor MP4, and its grid couples with drain electrode each other, and is coupled to the drain electrode of false transistor 208, and its source electrode then is to be coupled to node Q with an operation transconductance amplifier 250 and a nmos pass transistor MN6.Wherein, transistor MN6 is intended for the feedback element of operation transconductance amplifier 250.Thus, the electric current I d of the false transistor 208 of flowing through just can be identical with the current i 1 of flow through node Q and transistor MP4.
Shown in foregoing circuit, the operating point of false transistor 208 be designed to identical with power transistor 202, so words, the electric current I d of the false transistor 208 of flowing through just can produce according to this, perhaps is regarded as being got by the electric current I p of the power transistor 202 of flowing through.In addition, because false transistor 208 is of different sizes size with power transistor 202, so electric current I p can be the several times of electric current I d.
Moreover current-sensing circuit 200 can also comprise PMOS transistor MP7, and wherein the grid of transistor MP7 is coupled to the grid of transistor MP2, and its source electrode then is to be coupled to voltage source AVDD.Transistor MP7 and MP2 also can form current mirror, make an electric current CO to shift from current i 1 mirror image, and produce at the drain electrode end of transistor MP7, to be superimposed on the slope compensation.And current-sensing circuit 200 can also comprise PMOS transistor MP8, and wherein the grid of transistor MP8 is coupled to the grid of transistor MP2, and its source electrode is coupled to voltage source AVDD, and its drain electrode then is to be coupled to an impedance RS.Likewise, transistor MP8 and MP2 also can form current mirror, make an electric current CPSVO to shift from current i 1 mirror image; And produce at the drain electrode end of transistor MP8; In order to convert voltage into via impedance RS, make comparisons with the absolute voltage in the system, reach the purpose of circuit protection.
Embodiment by the invention described above can know; The application of aforementioned current-sensing circuit can provide induced current under the use that does not need general operational amplifier; More because need not use general operational amplifier and electric capacity, and the action of correlative compensation, therefore can successfully operate under the state at a high speed.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (22)
1. a current-sensing circuit is characterized in that, comprises:
One power transistor has one first end points, one second end points and power control terminal point, and wherein this second end points couples one first voltage source, and this power control terminal point couples a control voltage;
One first level shifter couples this first end points, and is pulled up to an operating voltage in order to the voltage with this first end points;
One operation transconductance amplifier couples this first level shifter, and in order to convert this operating voltage into an operating current;
One second level shifter couples this operation transconductance amplifier, and in order to this operating voltage is drawn the voltage of reducing to this first end points; And
One false transistor; Have a false control end points, one the 3rd end points and one the 4th end points; Wherein this false control end points couples this control voltage, and the 3rd end points couples this second level shifter and has the voltage identical with this first end points, and the 4th end points couples this first voltage source.
2. current-sensing circuit according to claim 1 is characterized in that, the size of this power transistor is to be several times as much as this false transistorized size.
3. current-sensing circuit according to claim 1 is characterized in that, this power transistor is also to be connected by several this false transistor to process.
4. according to claim 2 or 3 described current-sensing circuits, it is characterized in that the electric current of this power transistor of flowing through is to be several times as much as this false transistorized electric current of flowing through.
5. current-sensing circuit according to claim 1 is characterized in that, this operation transconductance amplifier also comprises:
One differential pair circuit receives the current bias of a current source, and has the differential input of the identical voltage of a pair of tool, this to differential input wherein one first input be this operating voltage that couples after drawing high by this first level shifter.
6. current-sensing circuit according to claim 5 is characterized in that, this operation transconductance amplifier also comprises:
One first current mirror couples this differential pair circuit, and the differential current of feasible this differential pair circuit of flowing through is identical and should have identical voltage to differential input.
7. current-sensing circuit according to claim 6 is characterized in that, this differential pair circuit also comprises:
One first bipolar junction transistor; Have one first base stage end points, a five terminal point and one the 6th end points; Wherein this first base stage end points is that conduct should be to wherein this first input of differential input, and this five terminal point couples this first current mirror, and the 6th end points couples this current source; And
One second bipolar junction transistor; Have one second base stage end points, one the 7th end points and one the 8th end points; Wherein this second base stage end points is as being somebody's turn to do differential input wherein one second to be imported, and the 7th end points couples this first current mirror, and the 8th end points couples this current source.
8. current-sensing circuit according to claim 7 is characterized in that, this first current mirror also comprises:
One first mos field effect transistor; Have one first control end points, one the 9th end points and 1 the tenth end points; Wherein this first control end points and the tenth end points couple this five terminal point of this first bipolar junction transistor, and the 9th end points couples one second voltage source; And
One second mos field effect transistor; Have one second control end points, 1 the 11 end points and 1 the 12 end points; Wherein this second control end points couples this first control end points; The 11 end points couples this second voltage source, and the 12 end points couples the 7th end points of this second bipolar junction transistor.
9. current-sensing circuit according to claim 5 is characterized in that, this first level shifter also comprises:
One the 3rd mos field effect transistor; Have one the 3rd control end points, 1 the 13 end points and 1 the 14 end points; Wherein the 3rd control end points couples this first end points of this power transistor; The 13 end points couples this to wherein this first input of differential input, and the 14 end points couples this first voltage source.
10. current-sensing circuit according to claim 9 is characterized in that, this second level shifter also comprises:
One the 4th mos field effect transistor; Have one the 4th control end points, 1 the tenth five terminal point and 1 the 16 end points; Wherein the 4th control end points couples this false transistorized the 3rd end points with the 16 end points, and the tenth five terminal point couples this to wherein this second input of differential input.
11. current-sensing circuit according to claim 1 is characterized in that, also comprises:
One second current mirror in order to this operating current is made mirror image processing, makes this operating current mirror image be transferred to this first level shifter.
12. a DC/DC transducer is characterized in that, comprises:
One control circuit is in order to export a pulse drive signal;
One switches switch, starts through this pulse drive signal, makes an inductance produce an inductive current via input voltage charging back; And
One current-sensing circuit; Export a current sensing signal in order to detect this inductive current; This current sensing signal is superimposed on the slope compensation that a slope equalizer exports; And this current sensing signal after the stack converts a feedback signal into to control this control circuit with this slope compensation, and this current-sensing circuit comprises:
One power transistor has one first end points, one second end points and power control terminal point, and wherein this second end points couples one first voltage source, and this power control terminal point couples a control voltage;
One first level shifter couples this first end points, and is pulled up to an operating voltage in order to the voltage with this first end points;
One operation transconductance amplifier couples this first level shifter, and in order to convert this operating voltage into an operating current;
One second level shifter couples this operation transconductance amplifier, and in order to this operating voltage is drawn the voltage of reducing to this first end points; And
One false transistor; Have a false control end points, one the 3rd end points and one the 4th end points; Wherein this false control end points couples this control voltage, and the 3rd end points couples this second level shifter and has the voltage identical with this first end points, and the 4th end points couples this first voltage source.
13. DC/DC transducer according to claim 12 is characterized in that, the size of this power transistor is to be several times as much as this false transistorized size.
14. DC/DC transducer according to claim 12 is characterized in that, this power transistor is also to be connected by several this false transistor to process.
15., it is characterized in that the electric current of this power transistor of flowing through is to be several times as much as this false transistorized electric current of flowing through according to claim 13 or 14 described DC/DC transducers.
16. DC/DC transducer according to claim 12 is characterized in that, this operation transconductance amplifier also comprises:
One differential pair circuit receives the current bias of a current source, and has the differential input of the identical voltage of a pair of tool, this to differential input wherein one first input be this operating voltage that couples after drawing high by this first level shifter.
17. DC/DC transducer according to claim 16 is characterized in that, this operation transconductance amplifier also comprises:
One first current mirror couples this differential pair circuit, and the differential current of feasible this differential pair circuit of flowing through is identical and should have identical voltage to differential input.
18. DC/DC transducer according to claim 17 is characterized in that, this differential pair circuit also comprises:
One first bipolar junction transistor; Have one first base stage end points, a five terminal point and one the 6th end points; Wherein this first base stage end points is that conduct should be to wherein this first input of differential input, and this five terminal point couples this first current mirror, and the 6th end points couples this current source; And
One second bipolar junction transistor; Have one second base stage end points, one the 7th end points and one the 8th end points; Wherein this second base stage end points is as being somebody's turn to do differential input wherein one second to be imported, and the 7th end points couples this first current mirror, and the 8th end points couples this current source.
19. DC/DC transducer according to claim 18 is characterized in that, this first current mirror also comprises:
One first mos field effect transistor; Have one first control end points, one the 9th end points and 1 the tenth end points; Wherein this first control end points and the tenth end points couple this five terminal point of this first bipolar junction transistor, and the 9th end points couples one second voltage source; And
One second mos field effect transistor; Have one second control end points, 1 the 11 end points and 1 the 12 end points; Wherein this second control end points couples this first control end points; The 11 end points couples this second voltage source, and the 12 end points couples the 7th end points of this this second bipolar junction transistor.
20. DC/DC transducer according to claim 16 is characterized in that, this first level shifter also comprises:
One the 3rd mos field effect transistor; Have one the 3rd control end points, 1 the 13 end points and 1 the 14 end points; Wherein the 3rd control end points couples this first end points of this power transistor; The 13 end points couples this to wherein this first input of differential input, and the 14 end points couples this first voltage source.
21. DC/DC transducer according to claim 20 is characterized in that, this second level shifter also comprises:
One the 4th mos field effect transistor; Have one the 4th control end points, 1 the tenth five terminal point and 1 the 16 end points; Wherein the 4th control end points couples this false transistorized the 3rd end points with the 16 end points, and the tenth five terminal point couples this to wherein this second input of differential input.
22. DC/DC transducer according to claim 12 is characterized in that, also comprises:
One second current mirror in order to this operating current is made mirror image processing, makes this operating current mirror image be transferred to this first level shifter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102115644A CN101677209B (en) | 2008-09-19 | 2008-09-19 | DC/DC converter and current induction circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102115644A CN101677209B (en) | 2008-09-19 | 2008-09-19 | DC/DC converter and current induction circuit thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101677209A CN101677209A (en) | 2010-03-24 |
| CN101677209B true CN101677209B (en) | 2012-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102115644A Expired - Fee Related CN101677209B (en) | 2008-09-19 | 2008-09-19 | DC/DC converter and current induction circuit thereof |
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| CN (1) | CN101677209B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10461629B2 (en) * | 2018-02-19 | 2019-10-29 | Texas Instruments Incorporated | System and apparatus to provide current compensation |
| CN108957102B (en) * | 2018-08-28 | 2024-03-08 | 长沙理工大学 | Current detection circuit without operational amplifier |
| CN117388562B (en) * | 2023-12-11 | 2024-03-12 | 珅斯电子(上海)有限公司 | Variable magneto-inductive current sensor and calibration method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1421987A (en) * | 2001-11-22 | 2003-06-04 | 台达电子工业股份有限公司 | DC-to-AC voltage conversion circuit and its control method |
| CN101093958A (en) * | 2006-06-23 | 2007-12-26 | 联发科技股份有限公司 | Switching type voltage adjuster and slope compensation process thereof |
-
2008
- 2008-09-19 CN CN2008102115644A patent/CN101677209B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1421987A (en) * | 2001-11-22 | 2003-06-04 | 台达电子工业股份有限公司 | DC-to-AC voltage conversion circuit and its control method |
| CN101093958A (en) * | 2006-06-23 | 2007-12-26 | 联发科技股份有限公司 | Switching type voltage adjuster and slope compensation process thereof |
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| CN101677209A (en) | 2010-03-24 |
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