CN111010159A - Load switch for reducing quiescent current - Google Patents
Load switch for reducing quiescent current Download PDFInfo
- Publication number
- CN111010159A CN111010159A CN201811168440.2A CN201811168440A CN111010159A CN 111010159 A CN111010159 A CN 111010159A CN 201811168440 A CN201811168440 A CN 201811168440A CN 111010159 A CN111010159 A CN 111010159A
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- China
- Prior art keywords
- circuit
- current
- comparator
- voltage
- load switch
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0036—Means reducing energy consumption
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0054—Gating switches, e.g. pass gates
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Abstract
A load switch for reducing quiescent current can realize the reduction of the quiescent current of the load switch and can not influence the normal function of the load switch, and is characterized by comprising a power switch tube, wherein the power switch tube comprises a grid electrode, a voltage access end and a voltage output end, the grid electrode is respectively connected with a charge pump and a current-limiting protection circuit, the current-limiting protection circuit is connected with a bias circuit, the bias circuit is connected with an oscillator circuit, the oscillator circuit is connected with the charge pump circuit, the bias circuit, the oscillator circuit and the charge pump circuit are all connected with the voltage access end, the voltage access end is connected with the negative input end of a comparator through a reference resistor, the positive input end of the comparator is connected with the voltage output end, and the output end of the comparator is respectively connected with the oscillator circuit and the current-limiting protection circuit, and the negative input end of the comparator is connected with the grounding end through a current source.
Description
Technical Field
The invention relates to an energy-saving or power consumption technology of a load switch, in particular to a load switch for reducing quiescent current.
Background
The load switch in the prior art generally consists of the following circuits: the circuit comprises a bias circuit, an oscillator circuit, a charge pump circuit, a current-limiting protection circuit and an output device Mnpower (also called a power switch tube). The power switch tube adopts an NMOS tube, the grid electrode of the NMOS tube is respectively connected with a charge pump and a current-limiting protection circuit, the current-limiting protection circuit is connected with a bias circuit, the bias circuit is connected with an oscillator circuit, the oscillator circuit is connected with the charge pump circuit, the source electrode of the NMOS tube is connected with a voltage output end, the drain electrode of the NMOS tube is connected with a voltage input end, and the bias circuit, the oscillator circuit and the charge pump circuit are all connected with the voltage input end. The bias circuit provides bias current and voltage for other modules, the oscillator circuit provides clock for the charge pump circuit, the charge pump provides grid voltage for the Mnpower, and the Mnpower provides current or voltage for the output device in the chip and the output load. The inventor finds that in order to maintain the performance of the load switch, for example, to ensure the accuracy and response speed of the current-limiting protection circuit, each module needs to consume a certain current, which results in excessive quiescent current consumed by the whole load switch. The inventor believes that if a comparator is added to the load switch circuit, when the load switch is in a quiescent state, the comparator output is high, the frequency of the oscillator is reduced, and the current limiting protection circuit is turned off, so that the quiescent current of the load switch can be reduced. When the load switch is in an overcurrent or starting state, the output of the comparator is low, so that the oscillator, the charge pump and the current-limiting protection circuit do not work, and the normal performance of the load switch is ensured. In view of the above, the present inventors have completed the present invention.
Disclosure of Invention
Aiming at the defects or shortcomings in the prior art, the invention provides the load switch for reducing the quiescent current, and the quiescent current of the load switch can be reduced and the normal function of the load switch can not be influenced by setting the comparator to compare the preset reference voltage with the output voltage of the power switch tube and controlling the frequency of the oscillator and/or the closing of the current-limiting protection circuit according to the comparison result.
The technical scheme of the invention is as follows:
the utility model provides a reduce quiescent current's load switch, its characterized in that, includes the power switch tube, the power switch tube includes grid, voltage incoming end and voltage output end, charge pump and current-limiting protection circuit are connected respectively to the grid, current-limiting protection circuit connects bias circuit, bias circuit connects the oscillator circuit, the oscillator circuit is connected the charge pump circuit, bias circuit the oscillator circuit with the charge pump circuit all connects the voltage incoming end, the voltage incoming end passes through reference resistance and connects the negative-going input of comparator, the positive-going input of comparator is connected the voltage output end, the output of comparator is connected respectively the oscillator circuit with current-limiting protection circuit, the negative-going input of comparator passes through the current source and connects the earthing terminal.
The power switch tube is an NMOS tube, a drain electrode of the NMOS tube is a voltage access end, the drain electrode of the NMOS tube is connected with an input voltage end Vin, a source electrode of the NMOS tube is a voltage output end, the source electrode of the NMOS tube is connected with an output voltage end Vout, the output voltage end Vout is connected with a positive input end of the comparator, the bias circuit, the oscillator circuit and the charge pump circuit are all connected with the input voltage end Vin, the input voltage end Vin is connected with a negative input end of the comparator through a reference resistor R, the negative input end of the comparator is connected with a ground end through a current source I, and the negative input end of the comparator obtains a reference voltage Vin-IR.
The comparator compares Vout with Vin-IR, wherein Vout is Vin-IMnpower RMnpower, IMnpower is current flowing through the power switch tube Mnpower, RMnpower is resistance of the power switch tube Mnpower, when Vout is larger than or equal to Vin-IR, the load switch is in a static state, the comparator outputs a high level, and the frequency of the oscillator circuit is reduced and/or the current limiting protection circuit is closed according to the high level.
When Vout is less than Vin-IR, the load switch is in an overcurrent or starting state, the comparator outputs a low level, the original frequency of the oscillator circuit is maintained or recovered according to the low level, and the starting state of the current-limiting protection circuit is maintained or recovered.
The invention has the following technical effects: the invention relates to a load switch for reducing quiescent current.A comparator is added in a load switch circuit, when the load switch is in a quiescent state, the output of the comparator is high, the frequency of an oscillator is reduced, and a current-limiting protection circuit is closed, so that the quiescent current of the load switch is reduced. When the load switch is in an overcurrent or starting state, the output of the comparator is low, so that the oscillator, the charge pump and the current-limiting protection circuit do not work, and the normal performance of the load switch is ensured.
The invention has the following characteristics: on the premise of not increasing extra area and circuit, only one comparator is added, so that the problems of reducing the quiescent current of the load switch and not influencing other performances are solved, and the method is very ingenious, simple and convenient and has low cost.
Drawings
Fig. 1 is a schematic diagram of a load switch structure for reducing quiescent current according to the present invention.
The reference numbers are listed below: 1-a bias circuit; 2-an oscillator circuit; 3-a charge pump circuit; 4-a current limiting protection circuit; 5-a comparator; 6-grounding end; vin-input voltage or input voltage value or input voltage terminal; vout-output voltage or output voltage value or output voltage terminal; mnpower-power switch tube; r-reference resistance; i-a reference current source (belonging to an on-chip current source) or a reference current; "Vin-IR" (IR is I R ≧ IMnpower: (IMnpower) RMnpower when the load switch is in quiescent state, I R < IMnpower: (RMnpower) when the load switch is in start-up or overcurrent state, where IMnpower is current flowing through the power switching tube Mnpower, and RMnpower is resistance of the power switching tube Mnpower) -reference voltage.
Detailed Description
The invention is described below with reference to the accompanying drawing (fig. 1).
Fig. 1 is a schematic diagram of a load switch structure for reducing quiescent current according to the present invention. As shown in fig. 1, a load switch for reducing quiescent current includes a power switch tube Mnpower, the power switch tube Mnpower comprises a grid electrode, a voltage access end and a voltage output end, the grid electrodes are respectively connected with a charge pump circuit 3 and a current-limiting protection circuit 4, the current-limiting protection circuit 4 is connected with a bias circuit 1, the bias circuit 1 is connected with an oscillator circuit 2, the oscillator circuit 2 is connected with the charge pump circuit 3, the bias circuit 1, the oscillator circuit 2 and the charge pump circuit 3 are all connected with the voltage access end, the voltage access terminal is connected to the negative input terminal (-) of the comparator 5 through a reference resistor R, the positive input end (+) of the comparator 5 is connected with the voltage output end, the output end of the comparator 5 is respectively connected with the oscillator circuit 2 and the current-limiting protection circuit 4, the negative input (-) of the comparator 5 is connected to the ground terminal 6 via the current source I.
The power switch tube Mnpower is an NMOS tube, a drain of the NMOS tube is a voltage access end, the drain of the NMOS tube is connected to an input voltage end Vin, a source of the NMOS tube is a voltage output end, the source of the NMOS tube is connected to an output voltage end Vout, the output voltage end Vout is connected to a positive input end (+) of the comparator 5, the bias circuit 1, the oscillator circuit 2 and the charge pump circuit 3 are all connected to the input voltage end Vin, the input voltage end Vin is connected to a negative input end (-) of the comparator 5 through a reference resistor R, the negative input end (-) of the comparator 5 is connected to a ground terminal 6 through a current source I, and the negative input end (-) of the comparator 5 obtains a reference voltage Vin-IR. The comparator 5 compares Vout with Vin-IR, where Vout is Vin-IMnpower RMnpower, where IMnpower is a current flowing through the power switch tube Mnpower, RMnpower is a resistance of the power switch tube Mnpower, when Vout is greater than or equal to Vin-IR, the load switch is in a quiescent state, the comparator outputs a high level, and the frequency of the oscillator circuit 2 is reduced and/or the current limiting protection circuit 4 is turned off according to the high level. When Vout is less than Vin-IR, the load switch is in an overcurrent or starting state, the comparator 5 outputs a low level, the original frequency of the oscillator circuit 2 is maintained or recovered according to the low level, and the opening state of the current-limiting protection circuit 4 is maintained or recovered.
As shown in fig. 1, when the load switch is in a quiescent state, Vout-Vin-IMnpower RMnpower. And adding a comparator module, and if Vout is greater than or equal to Vin-I R, wherein I R is IMnpower RMnpower, outputting a high level by the comparator, reducing the frequency of the oscillator and turning off the current-limiting protection module. As is well known, the quiescent current consumed by the oscillator and the charge pump is in direct proportion to the frequency, the frequency is reduced, the consumed quiescent current is correspondingly reduced, and the current limiting protection circuit does not consume any current after the current limiting protection circuit is closed, so that the quiescent current of the load switch is further reduced. When the load switch is in the on or over current state, Vout is less than Vin-IMnpower RMnpower. The comparator outputs low level, does not cause any influence on other modules, and maintains the normal performance of the load switch. Therefore, the invention has the function of reducing the quiescent current of the load switch without influencing the performance of the load switch. On the premise of not increasing extra area and circuit, only one comparator is added, so that the problems of reducing the quiescent current of the load switch and not influencing other performances are solved, and the method is very ingenious, simple and convenient and has low cost.
It is pointed out here that the above description is helpful for the person skilled in the art to understand the invention, but does not limit the scope of protection of the invention. Any such equivalents, modifications and/or omissions as may be made without departing from the spirit and scope of the invention may be resorted to.
Claims (4)
1. The utility model provides a reduce quiescent current's load switch, its characterized in that, includes the power switch tube, the power switch tube includes grid, voltage incoming end and voltage output end, charge pump and current-limiting protection circuit are connected respectively to the grid, current-limiting protection circuit connects bias circuit, bias circuit connects the oscillator circuit, the oscillator circuit is connected the charge pump circuit, bias circuit the oscillator circuit with the charge pump circuit all connects the voltage incoming end, the voltage incoming end passes through reference resistance and connects the negative-going input of comparator, the positive-going input of comparator is connected the voltage output end, the output of comparator is connected respectively the oscillator circuit with current-limiting protection circuit, the negative-going input of comparator passes through the current source and connects the earthing terminal.
2. The load switch for reducing quiescent current according to claim 1, wherein said power switch transistor is an NMOS transistor, a drain of said NMOS transistor is a voltage input terminal, a drain of said NMOS transistor is connected to an input voltage terminal Vin, a source of said NMOS transistor is a voltage output terminal, a source of said NMOS transistor is connected to an output voltage terminal Vout, said output voltage terminal Vout is connected to a positive input terminal of said comparator, said bias circuit, said oscillator circuit, and said charge pump circuit are all connected to said input voltage terminal Vin, said input voltage terminal Vin is connected to a negative input terminal of said comparator through a reference resistor R, said negative input terminal of said comparator is connected to a ground terminal through a current source I, and said negative input terminal of said comparator obtains a reference voltage Vin-IR.
3. The reduced quiescent current load switch of claim 2, wherein said comparator compares Vout with Vin-IR, Vout-IMnpower, RMnpower, Mnpower, wherein when Vout ≧ Vin-IR, the load switch is in quiescent state, said comparator outputs a high level, and wherein said oscillator circuit frequency is reduced and/or said current limiting protection circuit is turned off.
4. The quiescent current reduction load switch of claim 3, wherein when Vout < Vin-IR, then the load switch is in an over-current or start-up state, said comparator outputs a low level, the original frequency of said oscillator circuit is maintained or restored based on the low level, and the on-state of said current limiting protection circuit is maintained or restored.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811168440.2A CN111010159A (en) | 2018-10-08 | 2018-10-08 | Load switch for reducing quiescent current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811168440.2A CN111010159A (en) | 2018-10-08 | 2018-10-08 | Load switch for reducing quiescent current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111010159A true CN111010159A (en) | 2020-04-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811168440.2A Withdrawn CN111010159A (en) | 2018-10-08 | 2018-10-08 | Load switch for reducing quiescent current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111010159A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1916806A (en) * | 2005-08-18 | 2007-02-21 | 中兴通讯股份有限公司 | Control electrical appliances for electric charge pump |
| US20100156518A1 (en) * | 2008-12-18 | 2010-06-24 | Texas Instruments Incorporated | Dynamic Charge Pump System for Front End Protection Circuit |
| CN103095127A (en) * | 2013-01-22 | 2013-05-08 | 上海艾为电子技术有限公司 | Charge pump circuit and electronic equipment |
| US20150365087A1 (en) * | 2014-06-17 | 2015-12-17 | Texas Instruments Incorporated | Duty cycle-controlled load switch |
| US20160261261A1 (en) * | 2015-03-04 | 2016-09-08 | GLF Integrated Power, Inc. | Methods and Apparatus for a Burst Mode Charge Pump Load Switch |
| US20170063223A1 (en) * | 2015-08-28 | 2017-03-02 | Vidatronic Inc. | Voltage regulator with dynamic charge pump control |
-
2018
- 2018-10-08 CN CN201811168440.2A patent/CN111010159A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1916806A (en) * | 2005-08-18 | 2007-02-21 | 中兴通讯股份有限公司 | Control electrical appliances for electric charge pump |
| US20100156518A1 (en) * | 2008-12-18 | 2010-06-24 | Texas Instruments Incorporated | Dynamic Charge Pump System for Front End Protection Circuit |
| CN103095127A (en) * | 2013-01-22 | 2013-05-08 | 上海艾为电子技术有限公司 | Charge pump circuit and electronic equipment |
| US20150365087A1 (en) * | 2014-06-17 | 2015-12-17 | Texas Instruments Incorporated | Duty cycle-controlled load switch |
| US20160261261A1 (en) * | 2015-03-04 | 2016-09-08 | GLF Integrated Power, Inc. | Methods and Apparatus for a Burst Mode Charge Pump Load Switch |
| US20170063223A1 (en) * | 2015-08-28 | 2017-03-02 | Vidatronic Inc. | Voltage regulator with dynamic charge pump control |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200414 |
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| WW01 | Invention patent application withdrawn after publication |