CN103208983A - Good voltage output signal generating circuit and controller for preventing power-on error - Google Patents
Good voltage output signal generating circuit and controller for preventing power-on error Download PDFInfo
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- CN103208983A CN103208983A CN2012100131047A CN201210013104A CN103208983A CN 103208983 A CN103208983 A CN 103208983A CN 2012100131047 A CN2012100131047 A CN 2012100131047A CN 201210013104 A CN201210013104 A CN 201210013104A CN 103208983 A CN103208983 A CN 103208983A
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Abstract
Disclosed are a good voltage output signal generating circuit and a controller for preventing a power-on error. The good voltage output signal generating circuit which is used for generating a good voltage output signal according to control through the controller comprises an impedance unit, a controlled transistor and a power-on error prevention circuit; an input power supply terminal of the controller is in coupling connection with a first input voltage; one end of the impedance unit is in coupling connection with a second input voltage; the controlled transistor is provided with a first input and output terminal, a second input and output terminal and a controlled terminal; the first input and output terminal is in coupling connection with the other end of the impedance unit to generate a good signal; the second input and output terminal is in coupling connection with a common potential; the controlled terminal is in coupling connection with the controller; the power-on error prevention circuit is in coupling connection with the controlled terminal of the controlled transistor and one of the first input and output terminal and the second input voltage; and the power-on error prevention circuit enables the controlled transistor to be conducted to clamp a level of the good voltage output signal lower than a preset voltage value when the second input voltage is earlier than the first input voltage.
Description
Technical field
The invention relates to a kind of voltage output good signal that powers on wrong that prevents produces circuit and prevents the wrong controller that powers on.
Background technology
In the field of power supply control integrated circuit (IC, Integrated Circuit), whether some power supply control IC must go to monitor output voltage normal.When output voltage output just often, good (Power Good) pin of voltage output of power supply control IC then can provide voltage output good signal, allows system make a decision or processes.Especially (for example: computer), powering on and restarting of system is sequential in the Circuits System of complexity.Seeing also Fig. 1, is that a voltage is exported good signal PG as the schematic diagram of an enabling signal EN of the controller of next stage circuit, namely operates the circuit running mistake that may cause with the stable preceding next stage circuit of the output of avoiding upper level.See also Fig. 2, be voltage output good signal PG schematic diagram as the enabling signal EN of the controller of next stage circuit after adjusting.The necessity that has accurate position or sequential to adjust between late-class circuit before some, by a level shift circuit (Level Shifter), phase place and the accurate position that voltage can be exported good signal PG are adjusted to the enabling signal EN that is fit to the next stage controller.Please again referring to Fig. 3, be the circuit diagram of common level shift circuit.Voltage output good signal PG through the filtering of a resistance R 1 and a capacitor C 1, postpone after to control a transistor M1.Transistor M1 and a resistance R 2 series connection, and a transistor M2 and a resistance R 3 are also contacted, and the tie point of transistor M1 and resistance R 2 couples the grid of transistor M2.PG is high levle and continues for some time that then the cross-pressure on the capacitor C 1 is increased to and is enough to turn-on transistor M1 when voltage output good signal, and the grid that makes transistor M2 is that low level turn-offs, and enabling signal EN also is high levle.
Power supply control IC is general because driving force is also not enough, so can't guarantee suitably to drive the next stage circuit.Therefore, power supply control IC generally can produce the driving force that circuit comes booster tension output good signal PG by voltage output good signal.See also Fig. 4 a, produce the circuit diagram of circuit for general common voltage output good signal.Voltage output good signal produces a resistance R 4 and the transistor M5 that circuit comprises polyphone, and transistor M5 is subjected to the control of a controller 10.Controller 10 couples one first voltage VDD, operates required energy to receive, and when an output voltage (not drawing) of a change-over circuit of controlling arrived a predetermined potential, control transistor M5 turn-offed.One end of resistance R 4 couples one second voltage VX, and the other end couples the drain electrode of transistor M5.The source class ground connection of transistor M5 and grid couples controller 10.When transistor M5 turn-offed, voltage output good signal produced circuit in the tie point generation voltage output good signal PG of resistance R 4 with transistor M5.Yet voltage output good signal PG may be different in proper order because of providing of the first voltage VDD and the second voltage VX, and may wrong generation voltage output good signal PG.See also Fig. 4 b, for voltage shown in Fig. 4 a output good signal produce circuit in the second voltage VX, the first voltage VDD order is provided the time oscillogram.The second voltage VX is provided in time point t1, and the first voltage VDD in after be provided.At time point t2, the first voltage VDD rises to enough height, and controller 10 comes into operation and turn-on transistor M5.Between time point t1 and time point t2, because transistor M5 is for turn-offing, make the accurate position of voltage output good signal PG along with the second voltage VX rises, and the voltage of output error output good signal PG, until just stop output in time point t2 transistor M5 conducting.In time point t3, after controller 10 judges that the output voltage of change-over circuit has arrived predetermined potential, just turn-off transistor M5 with output voltage output good signal PG.And time point t1 may allow the late-class circuit that starts/operate according to voltage output good signal PG the wrong problem of running occur to the voltage output good signal PG of the output of the mistake between the time point t2.
Prior art:
Voltage output good signal PG
Enabling signal EN
Level shift circuit Level Shifter
Resistance R 1, R2, R3, R4
Capacitor C 1
Transistor M1, M2, M5
The first voltage VDD
The second voltage VX
Time point t1, t2, t3
The present invention:
Controller 100,200
Voltage output good signal PG
First logical circuit 102
Second logical circuit 104
The first input voltage VDD
The second input voltage VX,
Signal POK is judged in output
Enabling signal EN
Current source Is
Impedance unit R11, R13
Controlled xtal pipe M11, M13
Resistance R 12, R14
Transistor M12, M14
Summary of the invention
Difference in view of electric sequence of the prior art, may produce the problem of wrong voltage output good signal, the object of the present invention is to provide a kind of voltage output good signal that powers on wrong that prevents to produce circuit and controller, be output as duplicate supply by the logic that prevents from powering on wrong circuit or revise controller, make voltage output good signal produce circuit whereby and do not miss and produce voltage and export good signal because offering powering on of voltage source beyond the controller.
For reaching above-mentioned purpose, the present invention has disclosed a kind of voltage output good signal that powers on wrong that prevents and has produced circuit, produces voltage output good signal in order to the control according to a controller, and an input supply terminal of its middle controller couples one first input voltage.The voltage output good signal that prevents from powering on wrong produces circuit and comprises an impedance unit, a controlled xtal pipe and the wrong circuit that prevents from powering on.One end of impedance unit couples one second input voltage.The controlled xtal pipe has one first I/O end, one second I/O end and a controlled end, wherein the first I/O end couples the other end of impedance unit to produce voltage output good signal, the second I/O end couples a common electric potential, and controlled end couples controller, changes mode of operation with the control signal according to controller.The wrong circuit that prevents from powering on couple the controlled end of controlled xtal pipe and couple the transistorized first I/O end and second input voltage one of them, when second input voltage provided early than first input voltage, the wrong circuit that prevents from powering on made the conducting of controlled xtal pipe be lower than a scheduled voltage with the accurate position of strangulation voltage output good signal.
The present invention has also disclosed a kind of voltage output good signal that powers on wrong that prevents and has produced circuit, produces voltage output good signal in order to the control according to a controller, and an input supply terminal of its middle controller couples one first input voltage.The voltage output good signal that prevents from powering on wrong produces circuit and comprises a controlled xtal pipe, an impedance unit and the wrong circuit that prevents from powering on.The controlled xtal pipe changes mode of operation to a control signal that should controller.The controlled xtal pipe has one first I/O end, one second I/O end and a controlled end, and wherein the first I/O end couples one second input voltage.One end of impedance unit couples the second I/O end of controlled xtal pipe to produce voltage output good signal, and the other end couples a common electric potential.The wrong circuit that prevents from powering on couple the controlled end of controlled xtal pipe and couple the second I/O end of controlled xtal pipe and common electric potential one of them, when second input voltage provided early than first input voltage, the wrong circuit that prevents from powering on turn-offed the controlled xtal pipe.
The present invention has also disclosed a kind of wrong controller that prevents from powering on, and when an output voltage that is used to detect a change-over circuit of controlling reaches a predetermined value, controls voltage output good signal and produces circuit and produce voltage output good signal.Controller comprises one first logical circuit and one second logical circuit.First logic circuits coupled, one first input voltage; Second logical circuit couples one second input voltage, and an output of second logical circuit couples an output of first logical circuit.Wherein, first logical circuit and second logical circuit are provided respectively at first input voltage and second input voltage, and output voltage is when reaching predetermined value, produce control signal by separately output.
Above general introduction and ensuing detailed description are all exemplary in nature, are in order to further specify claim of the present invention.And relevant other objects and advantages of the present invention will be set forth in follow-up explanation and accompanying drawing.
Description of drawings
Fig. 1 is the schematic diagram of voltage output good signal as the enabling signal of the controller of next stage circuit;
Fig. 2 is voltage output good signal schematic diagram as the enabling signal of the controller of next stage circuit after adjusting;
Fig. 3 is the circuit diagram of common level shift circuit;
Fig. 4 a is the circuit diagram that general common voltage output good signal produces circuit;
Fig. 4 b for voltage shown in Fig. 4 a output good signal produce circuit in second voltage, first voltage order is provided the time oscillogram;
Fig. 5 a is the power on circuit diagram of wrong controller of preventing according to a preferred embodiment of the present invention;
Fig. 5 b produces the circuit diagram of circuit for the voltage output good signal that powers on wrong that prevents according to one first preferred embodiment of the present invention;
Fig. 5 c produces the circuit diagram of circuit for the voltage output good signal that powers on wrong that prevents according to one second preferred embodiment of the present invention;
Fig. 5 d produces the circuit diagram of circuit for the voltage output good signal that powers on wrong that prevents according to one the 3rd preferred embodiment of the present invention;
Fig. 5 e produces the circuit diagram of circuit for the voltage output good signal that powers on wrong that prevents according to one the 4th preferred embodiment of the present invention.
[primary clustering symbol description]
Embodiment
See also Fig. 5 a, be the power on circuit diagram of wrong controller of preventing according to a preferred embodiment of the present invention.When controller 100 reaches a predetermined value in an output voltage (not drawing) that detects a change-over circuit of controlling, produce a control signal and make voltage output good signal generation circuit produce voltage output good signal PG.Controller 100 comprises one first logical circuit 102 and one second logical circuit 104.First logical circuit 102 couples one first input voltage VDD and second logical circuit 104 couples one second input voltage VX, and an output of an output of first logical circuit 102 and second logical circuit 104 is coupled to each other, with common generation control signal.At this embodiment, second logical circuit 104 that reaches of first logical circuit 102 is NAND gate.When arbitrary the providing of the first input voltage VDD and the second input voltage VX, all can make circuit running corresponding in the output of first logical circuit 102 and second logical circuit 104 and make controller 100 correctly control voltage output good signal to produce circuit.First logical circuit 102 and second logical circuit 104 can accept that controller 100 is judged signal POK in order to an output of the output voltage of judging change-over circuit and in order to start an enabling signal EN of controller 100.Voltage output good signal produces circuit and comprises an impedance unit R11 and a controlled xtal pipe M11.The end of impedance unit R11 couples the second input voltage VX.Controlled xtal pipe M11 has one first I/O end (drain electrode), one second I/O end (source electrode) and a controlled end (grid).The first I/O end couples the other end of impedance unit R11 to produce above-mentioned voltage output good signal PG, the second I/O end couples a common electric potential (namely, ground connection), and controlled end couples controller 100, is conducting or shutoff to change mode of operation according to control signal.When output judged that signal POK, enabling signal EN, the first input voltage VDD and the second input voltage VX all exist, controller 100 just can turn-off controlled xtal pipe M11, made voltage output good signal produce circuit and produced voltage output good signal PG.If the second input voltage VX is provided early than the first input voltage VDD, main circuit (providing electrical power for operation by the first input voltage VDD) in the controller 100 also fails to operate at this moment, therefore the output voltage of change-over circuit is not also set up, and output judges that signal POK is the unfounded low level of representative output voltage.Therefore, second logical circuit 104 is exported the high levle signals and conducting controlled xtal pipe M11, makes voltage output good signal produce circuit and stops to produce voltage output good signal PG (being that voltage output good signal PG is low level).
See also Fig. 5 b, for the voltage output good signal that powers on wrong that prevents according to one first preferred embodiment of the present invention produces the circuit diagram of circuit.The voltage output good signal that prevents from powering on wrong produces circuit and comprises an impedance unit R11, a controlled xtal pipe M11 and the wrong circuit that prevents from powering on, and produces voltage output good signal PG in order to the control according to a controller 200.One input supply terminal of controller 200 couples one first input voltage VDD, to accept the required electric power of operation.The annexation of impedance unit R11 and controlled xtal pipe M11 sees also the explanation of Fig. 5 a, no longer repeats at this.The wrong circuit that prevents from powering on comprises a resistance R 12, couples controlled end and the second input voltage VX of controlled xtal pipe M11.When the second input voltage VX provides early than the first input voltage VDD, produce a control signal though controller 200 is failed operation and turn-off controlled xtal pipe M11, right resistance R 12 is understood along with the controlled terminal potential of controlled xtal pipe M11 is drawn high in the rising of the second input voltage VX, and makes controlled xtal pipe M11 be in conducting.Therefore, the accurate position of voltage output good signal PG can be no better than zero potential (being the current potential of ground connection).And the resistance of resistance R 12 is higher, so when the output voltage that begins to operate and be identified in the detecting change-over circuit when above-mentioned controller 200 has reached predetermined value, can be smoothly the current potential of the controlled end of controlled xtal pipe M11 be dragged down, makes controlled xtal pipe M11 shutoff.At this moment, impedance unit R11 draws high the accurate position that voltage is exported good signal PG, makes voltage output good signal produce circuit and produces voltage output good signal PG.
See also Fig. 5 c, for the voltage output good signal that powers on wrong that prevents according to one second preferred embodiment of the present invention produces the circuit diagram of circuit.Compared to the circuit shown in Fig. 5 b, the preventing of the present embodiment wrong circuit that powers on increases by a current source Is, is coupled between the controlled end of a resistance R 12 and a controlled xtal pipe M11, so that the electric current resistance R 12 of flowing through to be provided.Current source Is can be a depletion mode transistor, one first end (drain electrode) of depletion mode transistor couples resistance R 12, one second end (source electrode) of depletion mode transistor couples the controlled end of controlled xtal pipe M11, and second end of a controlled end (grid) of depletion mode transistor and depletion mode transistor couples.In addition, the substrate of shown depletion mode transistor is to be connected to source electrode among the figure, but also can ground connection and do not influence its function.When the second input voltage VX provided early than the first input voltage VDD, current source Is can be when the second input voltage VX provides, and the controlled end of transistor M11 is charged to promote controlled terminal potential, and make controlled xtal pipe M11 be in conducting.At this moment, the accurate position of voltage output good signal PG can be no better than zero potential.And resistance R 12 can be when static discharge, and protective current source Is directly damages current source Is to reduce static discharge.And the driving force of controller 200 is higher than current source Is, when the output voltage of confirming the detecting change-over circuit has reached predetermined value, the discharging current that is higher than current source Is charging current can be provided, smoothly the current potential of the controlled end of controlled xtal pipe M11 is dragged down, controlled xtal pipe M11 is turn-offed and the accurate position of voltage output good signal PG can be drawn high by impedance unit R11.
See also Fig. 5 d, for the voltage output good signal that powers on wrong that prevents according to one the 3rd preferred embodiment of the present invention produces the circuit diagram of circuit.Compared to the circuit shown in Fig. 5 b, the preventing of the present embodiment wrong circuit that powers on increases by a transistor M12, is coupled between the controlled end of a resistance R 12 and a controlled xtal pipe M11.At present embodiment, transistor M12 is the P transistor npn npn, and its first end (source electrode) couples the controlled end that resistance R 12, the second ends (drain electrode) couple controlled xtal pipe M11, and controlled end (grid) couples one first input voltage VDD.When the second input voltage VX provided early than the first input voltage VDD, the controlled end of transistor M12 was still at electronegative potential and conducting, made the controlled terminal potential of controlled xtal pipe M11 draw high and made controlled xtal pipe M11 conducting.At this moment, the accurate position of voltage output good signal PG can be no better than zero potential.Also provide and work as the first input voltage VDD, the controlled terminal potential of transistor M12 is elevated and transistor M12 is turned off.This moment, controller 200 also began operation, was conducting or shutoff and can directly control transistor M11 according to the result of the output voltage of detecting change-over circuit.
The tie point that resistance R 12 in above-described embodiment also can directly couple impedance unit R11 and controlled xtal pipe M11 couples the second input voltage VX with replacement, provides the voltage output good signal PG of different accurate positions scope to cooperate different circuit application environment.
In addition, the impedance unit R11 in the voltage output good signal generation circuit and the order of controlled xtal pipe M11 also can be exchanged.See also Fig. 5 e, for the voltage output good signal that powers on wrong that prevents according to one the 4th preferred embodiment of the present invention produces the circuit diagram of circuit.The voltage output good signal that prevents from powering on wrong produces circuit and comprises an impedance unit R13, a controlled xtal pipe M13 and the wrong circuit that prevents from powering on, and produces voltage output good signal PG in order to the control according to a controller 200.One input supply terminal of controller 200 couples one first input voltage VDD, to accept the required electric power of operation.It is conducting or shutoff that one control signal of the corresponding controller 200 of controlled xtal pipe M13 changes mode of operation.Controlled xtal pipe M13 has one first I/O end (source electrode), one second I/O end (drain electrode) and a controlled end (grid), and wherein the first I/O end couples one second input voltage VX.The end of impedance unit R13 couples the second I/O end of controlled xtal pipe M13 and exports good signal to produce this voltage, and the other end couples a common electric potential.The wrong circuit that prevents from powering on comprises a resistance R 14 and a transistor M14.One end of resistance R 14 couples the second input voltage VX, and the other end couples the controlled end of controlled xtal pipe M13 and first end (drain electrode) of transistor M14.Second end (source electrode) of transistor M14 couples a common electric potential, and controlled end (grid) couples the control signal control that controller 200 is produced to receive controller 200.When the second input voltage VX provides and during first input voltage did not provide, transistor M14 was turned off.At this moment, because resistance R 14 makes controlled xtal pipe M13 also for turn-offing, make voltage output good signal PG maintain low level.Certainly, second end of above-mentioned transistor M14 also can be couple to the second I/O end of controlled xtal pipe M13, so that the voltage output good signal PG of different accurate positions scope to be provided.
As mentioned above, the present invention meets patent three important documents fully: the practicality on novelty, creativeness and the industry.The present invention discloses with preferred embodiment hereinbefore, so is familiar with this operator and it should be understood that this embodiment only is used for describing the present invention, does not limit the scope of the invention and should not be read as.It should be noted, such as with variation and the displacement of this embodiment equivalence, all should be made as and be covered by in the category of the present invention.Therefore, protection scope of the present invention is when being as the criterion with the scope that appending claims was defined.
Claims (9)
1. a voltage output good signal that prevents from powering on wrong produces circuit, it is characterized in that, produce voltage output good signal in order to the control according to a controller, wherein an input supply terminal of this controller couples one first input voltage, and this prevents that the voltage output good signal that powers on wrong from producing circuit and comprising:
One impedance unit, an end of this impedance unit couples one second input voltage;
One controlled xtal pipe, have one first I/O end, one second I/O end and a controlled end, wherein this first I/O end couples the other end of this impedance unit to produce this voltage output good signal, this second I/O end couples a common electric potential, and this controlled end couples this controller with the control signal change mode of operation according to this controller; And
The one wrong circuit that prevents from powering on, couple this controlled end of this controlled xtal pipe and couple this first I/O end of this controlled xtal pipe and this second input voltage one of them, when this second input voltage provided early than this first input voltage, this wrong circuit that prevents from powering on made the conducting of controlled xtal pipe be lower than a scheduled voltage with the accurate position of this voltage output good signal of strangulation.
2. the voltage output good signal that powers on wrong that prevents according to claim 1 produces circuit, it is characterized in that, this wrong circuit that prevents from powering on comprises a resistance, one end of this resistance couple this first I/O end of this controlled xtal pipe and this second input voltage one of them, the other end couples this controlled end of this controlled xtal pipe.
3. the voltage output good signal that powers on wrong that prevents according to claim 1 and 2 produces circuit, it is characterized in that, this wrong circuit that prevents from powering on also comprises a depletion mode transistor, one first end of this depletion mode transistor couples this first I/O end of this controlled xtal pipe, one second end of this depletion mode transistor couples this controlled end of this controlled xtal pipe, and this second end of a controlled end of this depletion mode transistor and this depletion mode transistor couples.
4. the voltage output good signal that powers on wrong that prevents according to claim 1 and 2 produces circuit, it is characterized in that, this wrong circuit that prevents from powering on also comprises a P transistor npn npn, one first end of this P transistor npn npn couples this first I/O end of this controlled xtal pipe, one second end of this P transistor npn npn couples this controlled end of this controlled xtal pipe, and a controlled end of this P transistor npn npn couples this first input voltage.
5. the wrong controller that prevents from powering on is characterized in that, when an output voltage that is used to detect a change-over circuit of controlling reaches a predetermined value, controls voltage output good signal and produces circuit and produce voltage output good signal, and this controller comprises:
One first logical circuit couples one first input voltage; And
One second logical circuit couples one second input voltage, and an output of this second logical circuit couples an output of this first logical circuit;
Wherein, this first logical circuit and this second logical circuit are respectively at this first input voltage and this second input voltage is provided and this output voltage when reaching this predetermined value, produce a signal by separately this output, with this control signal of common generation.
6. the wrong controller that powers on that prevents according to claim 5 is characterized in that this first logical circuit and this second logical circuit are NAND gate.
7. a voltage output good signal that prevents from powering on wrong produces circuit, it is characterized in that, produce voltage output good signal in order to the control according to a controller, wherein an input supply terminal of this controller couples one first input voltage, and this prevents that the voltage output good signal that powers on wrong from producing circuit and comprising:
One controlled xtal pipe changes mode of operation to a control signal that should controller, and this controlled xtal pipe has one first I/O end, one second I/O end and a controlled end, and wherein this first I/O end couples one second input voltage;
One impedance unit, an end couple this second I/O end of this controlled xtal pipe to produce this voltage output good signal, and the other end couples a common electric potential; And
The one wrong circuit that prevents from powering on, couple this controlled end of this controlled xtal pipe and couple this second I/O end of this controlled xtal pipe and this common electric potential one of them, when this second input voltage provided early than this first input voltage, this wrong circuit that prevents from powering on turn-offed this controlled xtal pipe.
8. the voltage output good signal that powers on wrong that prevents according to claim 7 produces circuit, it is characterized in that, this wrong circuit that prevents from powering on comprises a resistance, and an end of this resistance couples this second input voltage, and the other end couples this controlled end of this controlled xtal pipe.
9. produce circuit according to claim 7 or the 8 described voltage output good signals that power on wrong that prevent, it is characterized in that, this wrong circuit that prevents from powering on also comprises a transistor, this transistorized one first end couples this controlled end of this controlled xtal pipe, this transistorized one second end couple this second I/O end of this controlled xtal pipe and this common electric potential one of them, and this transistorized one controlled end couples this controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100131047A CN103208983A (en) | 2012-01-13 | 2012-01-13 | Good voltage output signal generating circuit and controller for preventing power-on error |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100131047A CN103208983A (en) | 2012-01-13 | 2012-01-13 | Good voltage output signal generating circuit and controller for preventing power-on error |
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| Publication Number | Publication Date |
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| CN103208983A true CN103208983A (en) | 2013-07-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100131047A Pending CN103208983A (en) | 2012-01-13 | 2012-01-13 | Good voltage output signal generating circuit and controller for preventing power-on error |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104950722A (en) * | 2015-06-16 | 2015-09-30 | 无锡中星微电子有限公司 | Power supply circuit for terminal equipment |
| CN108107377A (en) * | 2017-12-27 | 2018-06-01 | 杰华特微电子（杭州）有限公司 | Power supply supervisory circuit, monitoring method and Switching Power Supply |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6204706B1 (en) * | 1998-06-24 | 2001-03-20 | Hewlett-Packard Company | Voltage supervisory circuit for a multi-rail power supply |
| TW201021345A (en) * | 2008-11-28 | 2010-06-01 | Inventec Corp | A protection circuit |
-
2012
- 2012-01-13 CN CN2012100131047A patent/CN103208983A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6204706B1 (en) * | 1998-06-24 | 2001-03-20 | Hewlett-Packard Company | Voltage supervisory circuit for a multi-rail power supply |
| TW201021345A (en) * | 2008-11-28 | 2010-06-01 | Inventec Corp | A protection circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104950722A (en) * | 2015-06-16 | 2015-09-30 | 无锡中星微电子有限公司 | Power supply circuit for terminal equipment |
| CN108107377A (en) * | 2017-12-27 | 2018-06-01 | 杰华特微电子（杭州）有限公司 | Power supply supervisory circuit, monitoring method and Switching Power Supply |
| CN108107377B (en) * | 2017-12-27 | 2023-09-22 | 杰华特微电子股份有限公司 | Power supply monitoring circuit, monitoring method and switching power supply |
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Application publication date: 20130717 |