CN109613326A - A kind of input over-voltage detection circuit that can work independently and its implementation - Google Patents
A kind of input over-voltage detection circuit that can work independently and its implementation Download PDFInfo
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- CN109613326A CN109613326A CN201811548891.9A CN201811548891A CN109613326A CN 109613326 A CN109613326 A CN 109613326A CN 201811548891 A CN201811548891 A CN 201811548891A CN 109613326 A CN109613326 A CN 109613326A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16504—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed
- G01R19/16519—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed using FET's
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- Semiconductor Integrated Circuits (AREA)
Abstract
The invention discloses a kind of input over-voltage detection circuits that can work independently, including the isolated tube framework circuit being mainly made of the isolation metal-oxide-semiconductor of external power supply VIN, charge pump, internal electric source VOUT and at least two mutual connections, it further include the over-voltage detection circuit for connecting external power supply VIN, SS (soft start) control circuit and charge pump simultaneously, the over-voltage detection threshold value setup module connecting with over-voltage detection circuit, the SS (soft start) control circuit are connect with charge pump；When voltage is in normal range (NR), SS (soft start) control circuit control charge pump slowly starts, and makes its that metal-oxide-semiconductor Gate pole tension be driven to rise, while ensuring electric current that metal-oxide-semiconductor flows through in the safe range of no surge peak current.The present invention by work independently over-voltage detection circuit real-time detection external power supply VIN whether over-voltage, when voltage is normal, the SS (soft start) control circuit control charge pump of setting is slowly opened, to make internal electric source VOUT be gradually increasing, avoid the occurrence of peak voltage, guarantee system safety, works normally circuit.
Description
Technical field
The present invention relates to IC design and application field, and in particular to be a kind of input over-voltage that can work independently
Detection circuit and its implementation.
Background technique
In traditional power-supply system with isolated tube, need to be added isolation metal-oxide-semiconductor to realize external power supply VIN and inside
One-way conduction reverse isolation function between power supply VOUT, the grid that metal-oxide-semiconductor is isolated have charge pump driving, but due to external power supply
The power up of VIN is often a feature that is non-ideal and having surge over voltage, and internal electric source can be directly conducting to after access
On VOUT, circuit is caused to damage, cannot achieve input overvoltage protection, the limitation of application is big, and such bring result is exactly interior
It needs access that can keep out the circuit of high voltage impact on portion power supply VOUT, leads to higher cost.
To solve the above-mentioned problems, scheme as shown in Figure 1 is generallyd use, it may be assumed that the isolation MOS that two source electrodes are connected
Pipe, the grid that metal-oxide-semiconductor is isolated have charge pump driving, realize and protect to the surge over voltage of external power supply VIN powered on moment.Its principle
Be using charge pump open delayed, surge voltage when due to powering on quickly, within Chang 10us, so being existed using time delay
External power supply VIN is powered on and is then turned on charge pump after a certain period of time, opens the isolation pole metal-oxide-semiconductor GATE；The voltage of each point measured or
Electric current is as shown in Figure 2.
Due to the pole GATE in opening procedure without SS (soft start) control circuit, VGSQuickly increase, according to metal-oxide-semiconductor current formula I
=K*W* (VGS-VTH)2It is found that the electric current by metal-oxide-semiconductor increased dramatically, point can be generated while GATE pole tension quickly increases
Peak current makes internal electric source VOUT voltage rapid increase, and biggish surge current can be due to parasitic inductance present on power source path
Very big peak voltage is generated, causes circuit to damage when serious, endangers the safety of system；In addition, the program is to surge over voltage
Protection be only limitted to the range of external power supply VIN powered on moment, if occurring on external power supply VIN accidentally touching the feelings of a constant over-voltage
Condition, charge pump can still open after a certain period of time in delay causes high pressure to flow into internal electric source VOUT.
Summary of the invention
The purpose of the present invention is to provide a kind of methods of the input over-voltage detection of autonomous working, solve existing detection method
Be unable to real-time detection input power whether over-voltage, and will appear huge surge when charge pump startup and cause self-induction peak voltage,
The problem of to damage circuit.
To achieve the above object, The technical solution adopted by the invention is as follows:
A kind of input over-voltage detection circuit that can work independently, including mainly by external power supply VIN, charge pump, internal electricity
The isolated tube framework circuit that the isolation metal-oxide-semiconductor of source VOUT and at least two mutual connections is constituted, further includes over-voltage detection circuit, over-voltage
Detection threshold value setup module, SS (soft start) control circuit；
The over-voltage detection circuit connects external power supply VIN, SS (soft start) control circuit and charge pump simultaneously, is used for real-time detection
The voltage of external power supply VIN, and simultaneously to SS (soft start) control circuit and charge pump transmission for judge external power supply VIN whether mistake
The OVP_FLAG signal of pressure；
The over-voltage detection threshold value setup module is connect with over-voltage detection circuit, is used for transmission OV_INFO information to over-voltage
Detection circuit makes it adjust overvoltage threshold in real time according to the OV_INFO information actually obtained；
The SS (soft start) control circuit connects charge pump, when OVP_FLAG signal is low level, SS (soft start) control circuit control
Charge pump processed slowly starts, and makes it that metal-oxide-semiconductor Gate pole tension be driven to rise, so that internal electric source VOUT voltage be enabled to gradually rise up to
Starting；Meanwhile in metal-oxide-semiconductor Gate pole tension uphill process, SS (soft start) control circuit ensures that the electric current that metal-oxide-semiconductor flows through is not having
In the safe range of surge peak current.
Further, it is further connected with clamp circuit between the adjacent mos pipe in the isolated tube framework circuit, for limiting
The VGS of metal-oxide-semiconductor is in normal range (NR).
Further, the OVP_FLAG signal is single line digital and analogue signals.
A kind of implementation method for the input over-voltage detection circuit that can work independently, comprising the following steps:
(1) it is controlled using outside or inside mode, the threshold value detected using over-voltage detection threshold value setup module preset overpressure,
And by the threshold packet transmission to over-voltage detection circuit；
(2) over-voltage detection circuit adjusts overvoltage threshold according to the threshold information of input in real time, then detects external power supply VIN
Voltage；
(3) after over-voltage detection circuit detection external power supply VIN voltage, output OVP_FLAG signal to SS (soft start) control circuit
And charge pump, show external power supply VIN over-voltage if OVP_FLAG signal is high level, SS (soft start) control circuit does not control at this time
Charge pump startup realizes two-way being isolated between external power supply VIN and internal electric source VOUT；If OVP_FLAG signal is low level
Then show external power supply VIN not over-voltage, SS (soft start) control circuit control charge pump slowly starts at this time, executes step (4)；
(4) charge pump driving metal-oxide-semiconductor Gate pole tension rises, so that internal electric source VOUT voltage is gradually increasing, mistake herein
Cheng Zhong, the VGS that SS (soft start) control circuit controls one of metal-oxide-semiconductor are kept fixed, and being maintained at the electric current for flowing through metal-oxide-semiconductor does not have
In the safe range of surge peak current, until internal electric source VOUT starting terminates.
Compared with prior art, the invention has the following advantages:
(1) present invention in currently existing scheme by adding over-voltage detection circuit and SS (soft start) control circuit, over-voltage detection
Circuit real-time monitoring external power supply VIN whether over-voltage, voltage under normal circumstances, SS (soft start) control circuit control charge pump it is slow
It opens, while the VGS for controlling isolation metal-oxide-semiconductor is fixed, and slowly increase internal electric source VOUT, is avoided the occurrence of huge surge and cause
Self-induction peak voltage；If over-voltage, the charge pump circuit of isolation metal-oxide-semiconductor grid is rapidly switched off, cutting external power supply VIN is logical
Two-way isolation is realized on road, solve existing detection method be unable to real-time detection input power whether over-voltage, and when charge pump startup
It will appear huge surge and cause self-induction peak voltage, so that the problem of damaging circuit, real-time monitoring voltage guarantee the upper of system
Electric process safety, avoids circuit from damaging.
(2) present invention in actual application scenarios, isolation metal-oxide-semiconductor should including but not limited to two or more,
And the connection type of multiple isolation metal-oxide-semiconductors can be source electrode and link together, and is also possible to drain electrode and links together, makes connection side
Formula is more flexible.
(3) over-voltage detection circuit that the present invention uses works independently, which is directly driven by external power supply VIN, be not necessarily to
External logic timing control, implementation is easy, and in no external power supply VIN access, does not need power consumption, reached power saving
Effect.
Detailed description of the invention
Fig. 1 is the electric operation control circuit figure of existing over-voltage detection.
Fig. 2 is electric current, the voltage change curve figure of each test point in existing over-voltage detection.
Fig. 3 is the electric operation control circuit figure that over-voltage of the invention detects.
Fig. 4 is electric current, the voltage change curve figure of each test point of the present invention.
Specific embodiment
The invention will be further described with embodiment for explanation with reference to the accompanying drawing, and mode of the invention includes but not only limits
In following embodiment.
Embodiment
As shown in figure 3, a kind of input over-voltage detection circuit that can work independently disclosed by the invention, including mainly by outside
The isolated tube framework circuit of power supply VIN, charge pump, the isolation metal-oxide-semiconductor composition of internal electric source VOUT and at least two mutual connections, also
Including over-voltage detection circuit, over-voltage detection threshold value setup module, SS (soft start) control circuit；
The over-voltage detection circuit connects external power supply VIN, SS (soft start) control circuit and charge pump simultaneously, is used for real-time detection
The voltage of external power supply VIN, and simultaneously to SS (soft start) control circuit and charge pump transmission for judge external power supply VIN whether mistake
The OVP_FLAG signal of pressure；
The over-voltage detection threshold value setup module is connect with over-voltage detection circuit, is used for transmission OV_INFO information to over-voltage
Detection circuit makes it adjust overvoltage threshold in real time according to the OV_INFO information actually obtained；
The SS (soft start) control circuit connects charge pump, when OVP_FLAG signal is low level, SS (soft start) control circuit control
Charge pump processed slowly starts, and makes it that metal-oxide-semiconductor Gate pole tension be driven to rise, so that internal electric source VOUT voltage be enabled to gradually rise up to
Starting；Meanwhile in metal-oxide-semiconductor Gate pole tension uphill process, SS (soft start) control circuit ensures that the electric current that metal-oxide-semiconductor flows through is not having
In the safe range of surge peak current.
It is further connected with clamp circuit between adjacent mos pipe in the isolated tube framework circuit, for limiting the VGS of metal-oxide-semiconductor
In normal range (NR).
In the scheme that the present invention designs, other than traditional isolation metal-oxide-semiconductor, charge pump, soft start control also added
The over-voltage detection circuit of circuit and autonomous working, over-voltage detection circuit directly drive work by external power supply VIN, using external or
Internal type control, the threshold value detected using over-voltage detection threshold value setup module preset overpressure, and by the threshold packet transmission to over-voltage
Detection circuit；Over-voltage detection circuit adjusts overvoltage threshold according to the threshold information of input in real time, then detects external power supply VIN's
Voltage；After over-voltage detection circuit detects external power supply VIN voltage, output OVP_FLAG signal to SS (soft start) control circuit and charge
Pump shows external power supply VIN over-voltage, SS (soft start) control circuit does not control charge at this time if OVP_FLAG signal is high level
Pump startup realizes two-way being isolated between external power supply VIN and internal electric source VOUT；If OVP_FLAG signal is low level,
Show external power supply VIN not over-voltage, SS (soft start) control circuit control charge pump slowly starts at this time；Charge pump drives metal-oxide-semiconductor
Gate pole tension rises, so that internal electric source VOUT voltage is gradually increasing, in the process, SS (soft start) control circuit is controlled wherein
The VGS of one metal-oxide-semiconductor is kept fixed, and is maintained at the electric current for flowing through metal-oxide-semiconductor in the safe range of no surge peak current, directly
Terminate to internal electric source VOUT starting, flows through electric current, isolation the metal-oxide-semiconductor grid voltage, internal electric source VOUT voltage of isolation metal-oxide-semiconductor
Change curve is as shown in Figure 4.
In the specific implementation process, it is parallel with capacitor C1 on the external power supply VIN, is connected with electricity on internal electric source VOUT
Hold C2, the other end ground connection of the capacitor C2, capacitor C1 keeps the output electric current of external power supply VIN more stable, electricity for filtering
Hold C2 and instantaneous pressure occur for filtering out to be disturbed in internal electric source VOUT, protects subsequent circuit；The over-voltage detection circuit
Output signal OVP_FLAG be single line digital and analogue signals；When threshold value is arranged by OV SET, can be set by internal or external
It sets, such as single line digital and analogue signals, various bus interface, digital coding.
Compared with existing over-voltage detection scheme, the present invention is added to over-voltage detection circuit and SS (soft start) control circuit, as long as
There is voltage on external power supply VIN, just will start over-voltage detection circuit and detect whether the voltage is in normal range (NR), currently existing scheme
Impact of the surge voltage of external power supply VIN powered on moment to circuit, but the party are avoided in the way of delayed start-up charge pump
The not set SS (soft start) control circuit of case flows to control the size of VGS so that VGS quickly increases during the pole GATE is opened
The electric current for crossing isolation metal-oxide-semiconductor sharply increases, and can generate biggish current surge in the process and make internal electric source VOUT voltage
Rapid increase；When over-voltage detection circuit of the invention detects that voltage is normal, SS (soft start) control circuit control charge pump is slowly opened
It opens, and controls VGS size and fix, the electric current for flowing through isolation metal-oxide-semiconductor is in stable state, has no the generation of surge current, protects
The safety of system；OV_INFO information is transferred to over-voltage detection electricity by the over-voltage detection threshold value setup module that the present invention is arranged
Road makes it adjust overvoltage threshold in real time according to the OV_INFO information actually obtained, and the solution of the present invention is made to be suitable for different voltages
The detection of range.
The present invention by above-mentioned design, efficiently solve existing detection method be unable to real-time detection input power whether mistake
Pressure, and will appear huge surge when charge pump startup and cause self-induction peak voltage, thus the problem of damaging circuit, as long as external
Power supply VIN is connected, and will continuing to detect the voltage, whether over-voltage can't consume electric current when no external power supply VIN is connected,
When the voltage for detecting external power supply VIN is in normal range (NR), SS (soft start) control circuit work, and control charge pump and slowly beat
It opens, while the VGS for automatically controlling isolation metal-oxide-semiconductor is fixed, the grid voltage that metal-oxide-semiconductor is isolated is gradually increasing, and flows through isolation metal-oxide-semiconductor
Electric current keeps stablizing, and no surge peak current keeps the power up of system safer.
Above-described embodiment is only one of the preferred embodiment of the present invention, should not be taken to limit protection model of the invention
It encloses, as long as that in body design thought of the invention and mentally makes has no the change of essential meaning or polishing, is solved
The technical issues of it is still consistent with the present invention, should all be included within protection scope of the present invention.
Claims (4)
1. a kind of input over-voltage detection circuit that can work independently, including mainly by external power supply VIN, charge pump, internal electric source
The isolated tube framework circuit that the isolation metal-oxide-semiconductor of VOUT and at least two mutual connections is constituted, which is characterized in that further include over-voltage detection
Circuit, over-voltage detection threshold value setup module, SS (soft start) control circuit；
The over-voltage detection circuit connects external power supply VIN, SS (soft start) control circuit and charge pump simultaneously, for outside real-time detection
The voltage of power supply VIN, and simultaneously to SS (soft start) control circuit and charge pump transmission for judge external power supply VIN whether over-voltage
OVP_FLAG signal；
The over-voltage detection threshold value setup module is connect with over-voltage detection circuit, is used for transmission OV_INFO information and is detected to over-voltage
Circuit makes it adjust overvoltage threshold in real time according to the OV_INFO information actually obtained；
The SS (soft start) control circuit connects charge pump, when OVP_FLAG signal is low level, SS (soft start) control circuit control electricity
The slowly starting of lotus pump, makes it that metal-oxide-semiconductor Gate pole tension be driven to rise, so that internal electric source VOUT voltage be enabled to gradually rise up to open
It is dynamic；Meanwhile in metal-oxide-semiconductor Gate pole tension uphill process, SS (soft start) control circuit ensures electric current that metal-oxide-semiconductor flows through in no wave
It gushes in the safe range of peak current.
2. a kind of input over-voltage detection circuit that can work independently according to claim 1, which is characterized in that the isolation
It is further connected with clamp circuit between adjacent mos pipe in pipe support structure circuit, the VGS for limiting metal-oxide-semiconductor is in normal range (NR).
3. a kind of input over-voltage detection circuit that can work independently according to claim 1 or 2, which is characterized in that described
OVP_FLAG signal is single line digital and analogue signals.
4. a kind of implementation method for the input over-voltage detection circuit that can work independently, which comprises the following steps:
(1) it is controlled using outside or inside mode, the threshold value detected using over-voltage detection threshold value setup module preset overpressure, and will
The threshold packet transmission is to over-voltage detection circuit；
(2) over-voltage detection circuit adjusts overvoltage threshold according to the threshold information of input in real time, then detects the electricity of external power supply VIN
Pressure；
(3) after over-voltage detection circuit detection external power supply VIN voltage, output OVP_FLAG signal to SS (soft start) control circuit and electricity
Lotus pump shows external power supply VIN over-voltage if OVP_FLAG signal is high level, and SS (soft start) control circuit does not control charge at this time
Pump startup realizes two-way being isolated between external power supply VIN and internal electric source VOUT；The table if OVP_FLAG signal is low level
Bright external power supply VIN not over-voltage, SS (soft start) control circuit control charge pump slowly starts at this time, executes step (4)；
(4) charge pump driving metal-oxide-semiconductor Gate pole tension rises, so that internal electric source VOUT voltage is gradually increasing, in the process,
The VGS that SS (soft start) control circuit controls one of metal-oxide-semiconductor is kept fixed, and the electric current for flowing through metal-oxide-semiconductor is made to be maintained at no surge
In the safe range of peak current, until internal electric source VOUT starting terminates.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811548891.9A CN109613326A (en) | 2018-12-18 | 2018-12-18 | A kind of input over-voltage detection circuit that can work independently and its implementation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811548891.9A CN109613326A (en) | 2018-12-18 | 2018-12-18 | A kind of input over-voltage detection circuit that can work independently and its implementation |
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Cited By (2)
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| CN110426549A (en) * | 2019-08-14 | 2019-11-08 | 上海爻火微电子有限公司 | The current detection circuit and electronic equipment of power channel |
| CN115296259A (en) * | 2022-09-27 | 2022-11-04 | 深圳利普芯微电子有限公司 | Overvoltage protection circuit and LED drive power supply |
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| CB03 | Change of inventor or designer information |
Inventor after: Bian Jianjian Inventor before: Chen Xin Inventor before: Bian Jianjian |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190412 |
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