CN106300246B - Overvoltage crowbar - Google Patents
Overvoltage crowbar Download PDFInfo
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- CN106300246B CN106300246B CN201610882518.1A CN201610882518A CN106300246B CN 106300246 B CN106300246 B CN 106300246B CN 201610882518 A CN201610882518 A CN 201610882518A CN 106300246 B CN106300246 B CN 106300246B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/042—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage comprising means to limit the absorbed power or indicate damaged over-voltage protection device
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- Electronic Switches (AREA)
- Protection Of Static Devices (AREA)
Abstract
The present invention relates to a kind of overvoltage crowbars.The overvoltage crowbar includes：Division module, signal switching module and comparison module；Division module includes to N number of partial pressure unit for being divided to signal to be detected, the output valve of each partial pressure unit includes target overvoltage detection voltage, the first hysteresis voltage and the second hysteresis voltage, and division module detects from N number of target overvoltage according to first control signal and target overvoltage detection voltage is obtained and exported in voltage；Wherein, N is positive integer；The feedback signal that signal switching module is used to be exported according to comparison module, from target overvoltage detection one of voltage and the first hysteresis voltage selection output to comparison module；Comparison module exports feedback signal and overvoltage protection signal for being compared to the output voltage and reference voltage of signal switching module.The present invention provides a kind of overvoltage crowbar, for the incoming level quick response to the level signal progress safety monitoring protection more than secure threshold, while to rotection thresholds and closes chip to protect system environments safe.
Description
Technical field
The present invention relates to high speed circuit field more particularly to a kind of overvoltage crowbars.
Background technology
In the charger device loaded applied to OTG, the load switching circuit of bidirectional conduction function is needed to have, it can
Enough meet power supply to charge to host equipment, the progress that host equipment loads OTG when also wanting to realize access OTG loads
Charging；
When USB interface is inserted into, the height that chip cannot be born may be introduced greatly very much by being exposed to external transmission line interface
Press pulse, even level surge.It is protected in this case it is necessary to carry out overvoltage detection to the level signal more than secure threshold
Shield, avoids chip from being burned with system environments.
Invention content
Present invention aim to address above-mentioned problems, it is proposed that a kind of overvoltage crowbar.
To achieve the above object, the present invention provides a kind of overvoltage crowbar, which includes：Divide mould
Block, signal switching module and comparison module；
Division module include to N number of partial pressure unit for being divided to signal to be detected, each partial pressure unit it is defeated
It includes target overvoltage detection voltage, the first hysteresis voltage and the second hysteresis voltage to go out value, and division module is according to first control signal
It is detected from N number of target overvoltage and target overvoltage detection voltage is obtained and exported in voltage；Wherein, N is positive integer；
The feedback signal that signal switching module is used to be exported according to comparison module detects voltage and first late from target overvoltage
The selection of one of stagnant voltage is exported to comparison module；
Comparison module for being compared to the output voltage and reference voltage of signal switching module, output feedback signal and
Overvoltage protection signal.
Preferably, overvoltage crowbar further includes gating module；
Gating module includes two input terminals, and two input terminals input the first hysteresis voltage and the second hysteresis voltage respectively,
Gating module one of selects output to signal to switch according to second control signal from the first hysteresis voltage and the second hysteresis voltage
Module；
The feedback signal that signal switching module is used to be exported according to comparison module detects voltage and first late from target overvoltage
The selection of one of stagnant voltage is exported to comparison module.
Preferably, N number of partial pressure unit includes：N group resistance groups and N number of gating switch；
The other end that one end of N group resistance groups and (N-1) organize resistance group connect, the other end of N group resistance groups and
The first end of n-th gating switch connects, the third end of n-th gating switch with " " connect, the second end of N number of gating switch
It is connect with the input terminal of division module；
Division module generates N groups partial pressure by N group resistance groups；Division module is by first control signal control n-th gating
Switch output N groups partial pressure.
Preferably, one group of resistance group of N groups resistance group includes：First resistor, second resistance, 3rd resistor and the 4th electricity
Resistance；
One end of first resistor is the input terminal of division module；The company of the other end of first resistor and one end of second resistance
Contact is the output end of the target overvoltage detection voltage of division module；The company of the other end of second resistance and one end of 3rd resistor
Contact is the output end of the first hysteresis voltage of division module；The tie point of one end of the other end of 3rd resistor and the 4th resistance
It is the output end of the second hysteresis voltage of division module.
Preferably, gating module includes：First PMOS transistor, the second PMOS transistor, third NMOS transistor, the 4th
NMOS transistor, the 5th NMOS transistor and the 6th NMOS transistor；
When the 4th NMOS transistor is on, the conducting of the first POMS transistors and third NMOS transistor, second
POMS transistors, the 5th NMOS transistor and the cut-off of the 6th NMOS transistor, make gating module export the first hysteresis voltage；
When the 6th NMOS transistor is on, the 2nd POMS transistors and the 5th NMOS transistor are connected, the first POMS
Transistor, third NMOS transistor and the cut-off of the 4th NMOS transistor, make gating module export the second hysteresis voltage.
Preferably, signal switching module includes：First gating switch and the second gating switch；
When the feedback signal of comparison module is 1, the conducting of the first gating switch, the cut-off of the second gating switch, signal switching
Module exports target overvoltage and detects voltage；
When the feedback signal of comparison module is 0, the cut-off of the first gating switch, the conducting of the second gating switch, signal switching
Module, which exports the first hysteresis voltage or the second hysteresis voltage, to be determined according to the output of gating module.
Preferably, circuit further includes the second control module；
When overvoltage crowbar is operating mode, reference voltage is provided for comparison module；
When overvoltage crowbar is test pattern, it is switched fast reference voltage for comparison module, accelerates comparison module
Response speed.
Preferably, the second control module includes：Third gating switch, eleventh resistor and the 6th NMOS transistor；
When overvoltage crowbar is operating mode, the enable signal of the second control module input is 0, third gating switch
Conducting, eleventh resistor are switched on, and the cut-off of the 6th NMOS transistor, the output of the second control module is to flow through eleventh resistor
Voltage；Reference voltage；When overvoltage crowbar is test pattern, when the enable signal of the second control module input is 1, third
Gating switch ends, and eleventh resistor is disconnected, the conducting of the 6th NMOS transistor, and the output of the second control module is the 6th NMOS
Voltage between the drain electrode of transistor, source electrode.
Preferably, when overvoltage crowbar is operating mode, comparison module is used for：
When the voltage of signal switching module output is more than reference voltage, comparison module exports feedback signal and overvoltage protection
Signal.
Preferably, when overvoltage crowbar is test pattern, comparison module is additionally operable to：
When the second control module switch comparison module input reference voltage be less than signal switching module output voltage, than
Overvoltage protection signal is generated compared with module.
Preferably, circuit further includes：First control module to division module for providing first control signal and choosing respectively
Logical module provides second control signal.
Preferably, circuit further includes：First time delay module is used to be postponed to the enable signal of comparison module, so as to
The input of comparison module is stablized, and is opened the enable signal of comparison module, is avoided comparison module by false triggering.
Preferably, circuit further includes：Second time delay module is for postponing the pulsewidth of overvoltage protection signal, so as to very
Good is identified, and then turns off chip.
The present invention provides a kind of overvoltage crowbar, for carrying out safety monitoring guarantor to the level signal more than secure threshold
Shield, while incoming level quick response to rotection thresholds and chip is closed to protect system environments safe.
Description of the drawings
Fig. 1 is the structural schematic diagram of overvoltage crowbar provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of a specific embodiment of division module 101 in Fig. 1；
Fig. 3 is the structural schematic diagram of a specific embodiment of signal switching module 102 in Fig. 1；
Fig. 4 is the structural schematic diagram of a specific embodiment of comparison module 103 in Fig. 1；
Fig. 5 is the structural schematic diagram of a specific embodiment of gating module 104 in Fig. 1；
Fig. 6 is the structural schematic diagram of a specific embodiment of the second control module 106 in Fig. 1；
Fig. 7 is the structural schematic diagram of a specific embodiment of the first Postponement module 107 in Fig. 1；
Fig. 8 is the structural schematic diagram of a specific embodiment of the second Postponement module 108 in Fig. 1.
Specific implementation mode
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
The present invention provides a kind of overvoltage crowbar, realize to higher than safe voltage incoming level signal quick response and
Shutdown, and over-pressed programming process realizes the configurable wide protection domain of the demand to different system.
Fig. 1 is the structural schematic diagram of overvoltage crowbar provided in an embodiment of the present invention.As shown in Figure 1, overvoltage protection is electric
Road includes division module 101, signal switching module 102, comparison module 103, gating module 104, the first control module 105,
Two control modules 106, the first Postponement module 107 and the second Postponement module 108.
Division module 101 include N number of partial pressure unit for being divided to signal to be detected, each partial pressure unit it is defeated
It includes target overvoltage detection voltage, the first hysteresis voltage and the second hysteresis voltage to go out value, and division module 101 is believed according to the first control
Number from N number of target overvoltage detect voltage in obtain and export target overvoltage detect voltage；Signal switching module 102 be used for according to than
Compared with the feedback signal of module 103, detects one of selection in voltage and the first hysteresis voltage from target overvoltage and export to comparison module
103；For comparison module 103 for being compared to the output voltage of signal switching module 102 and the reference voltage of acquisition, output is anti-
Feedback signal and overvoltage protection signal.
In actually using overvoltage crowbar, the signal of detection is different, so required hysteresis voltage is also
Different, a gating module 104 can also be connected before division module 101 and gating module 104.Gating module 104 is used
In give comparison module 103 provide hysteresis voltage.Realize the PLC technology of hysteresis voltage.
Therefore, overvoltage crowbar can also include：
Gating module 104 includes two input terminals, and two input terminals input the first hysteresis voltage and the second sluggish electricity respectively
Pressure, gating module 104 one of selects to export to letter from the first hysteresis voltage and the second hysteresis voltage according to second control signal
Number handover module 102.
Signal switching module 102 is used for the feedback signal according to comparison module 103, and voltage and gating are detected from target overvoltage
One of selection is exported to comparison module 103 in the output voltage of module 104；
Optionally, overvoltage crowbar further includes：First control module 105.First control module 105 gives division module
101 provide first control signal, and control division module 101 exports targets threshold and detects voltage.Selection target overvoltage detects voltage
It is by specifically needing the maximum voltage for protecting chip can bear come selection, the first control module 105 is set by this
Constant voltage generates first control signal control division module 101 and exports target overvoltage detection voltage.
First control module 105 also needs to provide second control signal to gating module 104, and then by gating module 104
Programmable hysteresis voltage is provided to comparison module 103, second control signal controls gating module 104 and exports the first hysteresis voltage
Or second hysteresis voltage.The first hysteresis voltage or the second hysteresis voltage are selected, is that place is required for working comparison module 103
Hysteresis voltage selection；The selection of hysteresis voltage also depends on specific needs simultaneously.
Reference voltage can be other module reference circuits to generate, the voltage not varied with temperature substantially.
In order to which reference voltage can be provided to overvoltage crowbar simultaneously, while accelerating the response speed of comparison module 103,
Overvoltage crowbar can also include：Second control module 106.
Second control module 106 works in the operational mode, and reference voltage is provided to comparison module 103.
Second control module 106 works in test mode, enabled by testing so that benchmark if there is over-pressed triggering
Signal directly declines, and accelerates the quick overturning of comparison module 103.
It is switched fast the negative input of comparison module 103 in test mode by the way that the second control module 106 is arranged
Reference signal, accelerate comparison module 103 response speed.
In order to solve comparison module 103 because of the unstable generation false triggering of incoming level, overvoltage crowbar further includes：First
Postponement module 107.
The enable signal that first Postponement module 107 is used to postpone to trigger comparison module 103, convenient in comparison module 103
Incoming level is then turned on comparison module 103 after stablizing, and avoids high-speed comparator false triggering.
The overvoltage protection signal that overvoltage crowbar generates needs to be identified and switched and chip by other protected modules
Connection, overvoltage crowbar further includes：Second time delay module 108.
Second Postponement module 108 is amplified by the pulsewidth for the overvoltage protection signal for exporting comparison module 103, is ensured
The width of the pulsewidth of overvoltage protection signal is normally identified by other modules enough, to turn off entire chip.Other modules can be
External detection module is switched off as long as the detection module detects that over-pressed signal generates between comparison module 103 and chip
Connection.
Division module 101 in Fig. 1 includes N number of (positive integer) partial pressure unit, and each partial pressure unit includes a resistance group
With a gating switch；N number of partial pressure unit includes N number of resistance group and N number of gating switch, one end and the (N- of N group resistance groups
1) other end connection of group resistance group, the other end of N group resistance groups are connect with the first end of n-th gating switch, n-th choosing
Open up the third end of pass with " " connect, the second end of N number of gating switch is connect with the input terminal of division module 101；Divide mould
Block 101 generates N groups partial pressure by N group resistance groups；Division module 101 is by first control signal control n-th gating switch output
N groups divide.
N number of gating switch carries out break-make control by the control signal that the first control module 105 generates, and exports meet demand
The voltage division signal of different amplitudes can realize wide threshold voltage ranges by external control bit.Difference control bit quantity may be implemented
Difference group output level.
Fig. 2 is the structural schematic diagram of a specific embodiment of division module 101 in Fig. 1.As shown in Fig. 2, partial pressure mould
Block 101 includes 2 groups of resistance groups and 2 gating switches.
Division module 101 exports two groups of level, and every group of level includes three level values.
Resistance group is R1-R4, resistance group is R5-R8, gating switch N1 and gating switch N2；The first places resistance R1-R8 are successively
It is connected in series with, one end of resistance R1 is connect with the input terminal of input signal to be detected, the other end and the gating switch pipe of resistance R8
The first end of N2 connects, and the other end of resistance R1 and the tie point of one end of resistance R2 are detected as the target overvoltage of A control bits
Voltage output end is denoted as VA_H；The hysteresis voltage of the other end of resistance R2 and the tie point of one end of resistance R3 as A control bits
Output end is denoted as VA_M；The other end of resistance R3 and the tie point of one end of resistance R4 are exported as the hysteresis voltage of A control bits
End, is denoted as VA_L；The other end of resistance R4 is connect with the tie point of one end of resistance R5 with the first end of gating switch pipe N1；Electricity
The tie point for hindering the other end of R5 and one end of resistance R6 detects voltage output end as the target overvoltage of B control bits, is denoted as VB_
H；The hysteresis voltage output end of the other end of resistance R6 and the tie point of one end of resistance R7 as B control bits, is denoted as VB_M；Electricity
Hysteresis voltage output end of the tie point of the other end of R7 and one end of resistance R8 as B control bits is hindered, VB_L is denoted as.
The input terminal of the second end of gating switch pipe N2 signal SELB in order to control, the third end of gating switch pipe N2 with " "
Connection.The input terminal of the second end of gating switch pipe N1 signal SELA in order to control, the third end of gating switch pipe N1 with " " even
It connects.
Input signal to be detected determines, is connected when the control signal that the first control module 105 generates controls gating switch N1,
The N2 cut-offs of gating switch pipe, VA_H, VA_M and VA_L are selected as the output of division module 101；When the first control module 105 is produced
Raw control signal control gating switch N1 cut-offs, the N2 conductings of gating switch pipe, VB_H, VB_M and VB_L are selected as dividing mould
The output of block 101.VH is that target overvoltage detects voltage, and VM and VL provide hysteresis voltage.
Division module 101 is selected a target overvoltage detection by the first control signal that the first control module 105 provides
Voltage output.
For example, the reference voltage of comparison module 103 is 1V, the first control module 105 controls division module 101 and selects resistance
Intrinsic standoff ratio is 1/17, and when input voltage to be detected is 17V, the target overvoltage detection voltage that control division module 101 exports is
1V, at this time comparison module 103 overturn, output over-voltage protection signal.
It should be noted that multiplexing gating switch is provided between division module 101 and gating module 104, convenient for selecting
When selecting a certain voltage of output, multiplexing gating switch connects the connection between division module 101 and gating module 104.
Division module 101 can also realize this technical solution by other circuits.
Fig. 3 is the structural schematic diagram of a specific embodiment of the signal switching module 102 in Fig. 1.As shown in figure 3,
Signal switching module 102 includes：Gating switch K1, gating switch K2, phase inverter NOT1.
The first end of gating switch K1 is connect with the third end of the input terminal of phase inverter NOT1, gating switch K2, as letter
Number comparison module 103 feeds back to the input of signal switching module 102, is labeled as CMP；The second end of gating switch K1 is opened with gating
Close the second end connection of K2, the output V as signal switching module 102CMP；The third end of gating switch K1 and gating switch K2
First end, phase inverter NOT1 output end connection；Input terminal of the 4th end of gating switch K1 as signal switching module 102
VCMP_H；Input terminal V of the 4th end of gating switch K2 as signal switching module 102CMP_L。VCMP_HFor target overvoltage threshold,
VCMP_LFor the output of gating module 104.
When comparison module 103 has feedback signal (it is high level that comparison module 103, which exports, at this time) CMP to signal switching module
102, gating switch K2 is switched on, and gating switch K1 is disconnected；The 4th termination of gating switch K2 is led to and 101 output end of division module
VCMP_HConnection, VCMP_HOutput as signal switching module 102.
When 103 feedback-less signal of comparison module (at this point, comparison module 103 exports low level) CMP is to signal switching module
102, gating switch K2 is disconnected, and gating switch K1 is connected；The 4th termination of gating switch K1 is led to and 101 output end of division module
VCMP_LConnection, VCMP_LOutput as signal switching module 102.
Signal switching module 102 is used to that the realization lag function of comparison module 103, comparison module 103 to be given to have lag function,
It can then be overturn except a hysteresis voltage range.
For example, in the operational mode, when input signal to be detected is more than reference voltage, 103 output overvoltage of comparison module
Protection signal, if signal to be detected persistently increases, the output of comparison module 103 is still overvoltage protection signal (high level), in high electricity
Under flat effect, signal switching module 102 exports hysteresis voltage, only when hysteresis voltage is less than reference voltage, comparison module 103
Low level is exported, overvoltage protection signal is discharged.
For example, in test mode, the enable signal of the second control module 106 connects the benchmark so that comparison module 103
Signal is switched fast, and tests the response speed of overvoltage crowbar.
The overvoltage protection signal that comparison module 103 generates is detected by external detection module, is detecting overvoltage protection letter
Number when, detection module cut-out and the connection of chip.
Signal switching module 102 can also realize this technical solution by other circuits.
Fig. 4 is the structural schematic diagram of a specific embodiment of comparison module 103 in Fig. 1.As shown in figure 4, comparing mould
Block 103 improves response speed using multi-stage cascade mode.Comparison module 103 in Fig. 4 uses three-stage cascade mode, raising to compare
The response speed of module 103.
Comparison module 103 includes：The comparison module 103 of three-stage cascade mode includes transistor MN0-MN5, transistor MP1-
MP9, current source I1, comparator AMP1, phase inverter NOT2, resistance R1 and resistance R2.
The source electrode of transistor MN0-MN5, the other end of resistance R1, resistance R2 the other end connection common reference " "；Electricity
The cathode of stream source I1 is connect with the drain electrode of transistor MNO, grid, and the grid of transistor MN0 is connect with the grid of transistor MN5；
The grid of transistor MN1 is connect with the grid of transistor MN0, and the drain electrode of transistor MN1 is connect with the drain electrode of transistor MP5；It is brilliant
Grid, drain electrode and the drain electrode of transistor MP3 of body pipe MN2 connects, and the grid of transistor MN2 is connect with the grid of transistor MN3；
The drain electrode of transistor MN3 is connect with the drain electrode of the grid of transistor MP4, transistor MP4；The grid and transistor of transistor MN4
The drain electrode of MN3 connects, and the drain electrode of transistor MN4 is connect with the drain electrode of the input terminal of comparator AMP1, transistor MP8；Transistor
The drain electrode of MN5 is connect with the grid of transistor MP8-MP9.
The anode connection of the source electrode, current source I1 of transistor MP5-MP9；The drain electrode of transistor MP1 is another with resistance R1's
The grid connection at end, transistor MP3, the source electrode of transistor MP1 are connect with the drain electrode of the source electrode of transistor MP2, transistor MP6,
Positive input of the grid of transistor MP1 as comparison module 103 is labeled as INP；The drain electrode of transistor MP2 and resistance R2
The other end, transistor MP4 grid connection, the negative input of the grid comparison module 103 of transistor MP2 is labeled as
INN；The source electrode of transistor MP3 is connect with the drain electrode of the source electrode of transistor MP4, transistor MP7；The grid of transistor MP5 and crystalline substance
The grid of body pipe MP6-MP7 connects.
The output end of comparator AMP1 is connect with the input terminal of phase inverter NOT2, and the output end of phase inverter NOT2 is to compare mould
The output end of block 103 is labeled as CMP_OUT.
The first order cascades：Transistor MP1, transistor MP2, transistor MP6, resistance R9 and resistance R10 realize that signal is put in advance
Greatly；The second level cascades：Transistor MP3, transistor MP4, transistor, MN1 transistors NM3 and transistor MP7, realize the height of signal
Speed ratio is relatively adjudicated；The third level cascades：Transistor MN4, transistor MN5, transistor MP8 and transistor MP9, wherein transistor MP9
It is the offset that bias supply is provided for transistor MP8 and transistor MN4, transistor MP8 and transistor MN4 with transistor MP5
For amplifying the output signal of the second level.
It is that the gap of first order cascaded-output is exported to second level cascade and is amplified using the effect of three-stage cascade,
The output of the second level third level is input to again to be amplified.After carrying out first time amplification, the difference of first order output can become
Greatly, after second is amplified, it is possible to the turnover voltage of comparison module 103 can be reached, third time need not be carried out at this time
Amplification, accelerates the response speed of comparison module 103.
In the operational mode, overturning protection occurs when positive input signal is less than cathode input signal for comparison module 103；
It is test and comparison module 103 since the output voltage Vcomp climbing speeds of signal switching module 102 are limited under test pattern
Rate is most overturn soon, is directly opened EN_test and is enabled, enable signal EN_test is accessed, by the reference level of comparison module 103
Pull down to it is low, make comparison module 103 positive input signal (output voltage of signal switching module 102) be more than cathode input letter
Number (reference voltage) completes signal overturning.
When signal overturning occurs for comparison module 103, the detection module of system turns off core when receiving energizing signal
Piece plays the role of protecting chip.
Comparison module 103 can also realize this technical solution by other circuits.
Fig. 5 is the structural schematic diagram of a specific embodiment of gating module 104 in Fig. 1.As shown in figure 5, gating mould
Block 104 includes transistor P1-P2, transistor N3-N6.101 output end of division module is VA_H, VA_L and VA_M in Fig. 2.
Gating module 104 has 6 input terminals, SEL_L and SEL_M for being selected from (by taking A is controlled as an example) VA_L and VA_M
A value is selected as output.
The drain electrode of transistor P1 is connect with the input terminal of VA_M, the grid of transistor P1 and the grid of transistor N3, gating
The input signal SEL_M (the control signal generated to gating module 104 by the first control module 105) of module 104, " " even
It connects, the source electrode of transistor P1 is connect with the drain electrode of the source electrode of transistor N3, transistor N4；The drain electrode of transistor P2 is defeated with VA_L's
Enter end connection, the grid of transistor P2 and the grid of transistor N5, gating module 104 input signal SEL_L, " " connect,
The source electrode of transistor P2 is connect with the drain electrode of the source electrode of transistor N5, transistor N6.
The drain electrode of transistor N3 is connect with the output end SCMP_L of the drain electrode of transistor N5, gating module 104；Transistor N4
Grid connect with the input SEL_L of gating module 104, the source electrode of transistor N4 with " " connect；The grid of transistor N6 with
The input terminal SEL_M connections of gating module 104, the source electrode of transistor N6 with " " connect.
When the 105 controlling transistor P1 conductings of the first control module, transistor P2 cut-offs, VA_M is exported by selection；When first
105 controlling transistor P2 conductings of control module, transistor P1 cut-offs, VA_L are exported by selection.
Gating module 104 is used to provide hysteresis voltage to comparison module 103, compares more common comparator, has sluggishness
The comparator performance of function is more stable, and anti-interference ability is stronger.
Gating module 104 can also realize this technical solution by other circuits.
Fig. 6 is the structural schematic diagram of a specific embodiment of the second control module 106 in Fig. 1.As shown in fig. 6,
Second control module 106 includes：Gating switch K3, resistance R9, transistor N7, capacitance C1.
The 4th end connection reference voltage Vref_in of gating switch K3；The second end of gating switch K3 and the one of resistance R9
End connection；The third end of gating switch K3 is connect with the grid of transistor N1, and the grid of transistor N7 is the second control module 106
Input terminal, be enable signal, be labeled as EN_test.
The source electrode of transistor N7 with reference to " " connect；The drain electrode of transistor N7 and the other end of resistance R9, capacitance C1
The output end Vref_cmp connections of one end, the second control module 106；The other end of capacitance C1 with reference to " " connect.
Second control module 106 is under operating mode, and reference level Vref_ is provided to 103 negative input end of comparison module
In is inputted as the cathode of comparison module 103.
Second control module 106 is under test pattern, and the second control module 106 has enable signal EN_test inputs, makes
Gating switch K3 cut-offs are obtained, the drain electrode of transistor N6 is connect with the output end of the second control module 106, resistance R11 cut-offs so that
The output rapid decrease of second control module 106 accelerates the reversal rate of comparison module 103.
Second control module 106 is used for the offer reference voltage of the negative input of comparison module 103.In test pattern
Under, it is switched fast the reference voltage of the negative input of comparison module 103, accelerates the reversal rate of comparison module 103.
Second control module 106 can also realize this technical solution by other circuits.
Fig. 7 is the structural schematic diagram of a specific embodiment of the first Postponement module 107 in Fig. 1.As shown in fig. 7, first
Postponement module 107 includes transistor MP10-MP13, transistor MN6-MN9, resistance R12, resistance R13, phase inverter NOT3, reverse phase
Device NOT4, capacitance C2.
The source electrode of transistor MP10-MP12 is connect with one end of capacitance C2；The grid and transistor of transistor MP10-MP11
Input terminal EN (enable signal of triggering comparison module 103) connection of the grid of MN10, the first Postponement module 107, transistor
The drain electrode of MP10 is connect with one end of resistance R12；The drain electrode of transistor MP11 is connect with the source electrode of transistor MP13；Transistor
The grid of MP12 and the grid of transistor MN12, the other end of capacitance C2, the drain electrode of transistor MP13, transistor MN13 source
One end connection of pole, the other end of resistance R12, resistance R13, the drain electrode of transistor MP12 and input terminal, the crystalline substance of phase inverter NOT3
The source electrode of body pipe MN8, transistor MP13, transistor MN13 connections.
Transistor MN6-MN8 source electrode connection common reference " "；The other end of the source electrode and resistance R13 of transistor MN6
Connection；The source electrode of transistor MN7 is connect with the drain electrode of transistor MN9.
First Postponement module 107 allows enable signal EN to postpone by regulation resistance R12, R13 and capacitance C2, ensures input electricity
It is then turned on comparison module 103 after steadily determining, avoids 103 false triggering of comparison module.
Its delay is by regulation resistance R12, resistance R13 and capacitance C2.Delay is the section to resistance R12 and resistance R13
Point does failing edge time delay.That is, when input signal enable signal EN rising edges arrive (enable signal EN is effective at this time),
Failing edge slows down at resistance R12 and resistance R13 nodes, i.e. the phase inverter input of transistor MP12 and transistor MN8 compositions decline
Along slowing down, then its output level rising edge can postpone, realize enable signal EN rising edges to transistor MP12, transistor
The delay of MN8 output signal rising edges.
The effect of delay is, it is ensured that over-pressed comparison signal is then turned on over-pressed comparison module 103 after stablizing output, avoids accidentally touching
Hair.Phase inverter NOT3, phase inverter NOT4 are primarily used to increase the driving capability of delay circuit.
First Postponement module 107 can also realize this technical solution by other circuits.
Fig. 8 is the structural schematic diagram of a specific embodiment of the second Postponement module 108 in Fig. 1.As shown in figure 8, second
Postponement module 108 includes：Trigger D1, trigger D2 and trigger D3.Second Postponement module 108 is prolonged using multistage d type flip flop
When realize.It is connected using three-level d type flip flop in Fig. 8.
The Q1 output ends of D1 triggers are connect with the input terminal of D2 triggers, Q2 output ends and the D3 triggers of D2 triggers
Input terminal connection, D3 triggers Q3 output ends output OVP (Over Voltage Protection), CLK be triggering believe
Number, control d type flip flop work, RST is reset signal, and CMP is the output signal of comparison module 103, and OVP is overvoltage crowbar
Final output signal.
It is used to postpone the low level of overvoltage protection signal (high level is effective) using multiple d type flip flops, high level
Normal output, substantially lengthens the high level durations of overvoltage protection signal, convenient for the mould of detection overvoltage crowbar
Block can accurately detect effective overvoltage protection signal, and then cut off the connection with chip, play connection function.
Second Postponement module 108 can also realize this technical solution by other circuits.
The present invention provides a kind of overvoltage crowbar, for carrying out safety monitoring guarantor to the level signal more than secure threshold
Shield, while incoming level quick response to rotection thresholds and chip is closed to protect system environments safe.
Above-described specific implementation mode has carried out further the purpose of the present invention, technical solution and advantageous effect
It is described in detail, it should be understood that the foregoing is merely the specific implementation mode of the present invention, is not intended to limit the present invention
Protection domain, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (9)
1. a kind of overvoltage crowbar, which is characterized in that including：Division module (101), compares mould at signal switching module (102)
Block (103) and gating module (104)；
The division module (101) includes each partial pressure to N number of partial pressure unit for being divided to signal to be detected
The output valve of unit includes target overvoltage detection voltage, the first hysteresis voltage and the second hysteresis voltage, the division module (101)
It is detected from N number of target overvoltage according to first control signal and target overvoltage detection voltage is obtained and exported in voltage；Wherein, N is just
Integer；
The feedback signal that the signal switching module (102) is used to be exported according to the comparison module (103), from the target mistake
Pressure detection one of voltage and first hysteresis voltage selection is exported to the comparison module (103)；
The comparison module (103) is used to be compared the output voltage and reference voltage of the signal switching module (102),
Export the feedback signal and overvoltage protection signal；
The gating module (104) include two input terminals, described two input terminals input respectively first hysteresis voltage and
Second hysteresis voltage, the gating module (104) is according to second control signal from first hysteresis voltage and described
One of selection is exported to the signal switching module (102) in two hysteresis voltages；
The feedback signal that the signal switching module (102) is used to be exported according to the comparison module (103), from the target mistake
The selection of one of output voltage of pressure detection voltage and the gating module is exported to the comparison module (103).
2. circuit according to claim 1, which is characterized in that a partial pressure unit of N number of partial pressure unit includes：The
One resistance (R1), second resistance (R2), the 4th resistance (R4) of 3rd resistor (R3) and the first transistor (N1)；
One end of the first resistor (R1) is the input terminal of the division module (101)；The first resistor (R1) it is another
The tie point of end and one end of the second resistance (R2) is the output of the target overvoltage detection voltage of the division module (101)
End；The other end of the second resistance (R2) and the tie point of one end of the 3rd resistor (R3) are the division modules
(101) output end of the first hysteresis voltage；One end of the other end and the 4th resistance (R4) of the 3rd resistor (R3)
Tie point be the division module (101) the second hysteresis voltage output end；The other end of 4th resistance (R4) with
The drain electrode of the first transistor (N1) connects, and the source electrode of the first transistor (N1) is connected to ground, the first transistor (N1)
Grid connect with the first control signal.
3. circuit according to claim 1, which is characterized in that the gating module (104) includes：First PMOS transistor
(P1), the second PMOS transistor (P2), third NMOS transistor (N3), the 4th NMOS transistor (N4), the 5th NMOS transistor
(N5) and the 6th NMOS transistor (N6)；
When the 4th NMOS transistor (N4) is on, the first POMS transistors (P1) and the 3rd NMOS it is brilliant
Body pipe (N3) is connected, the 2nd POMS transistors (P2), the 5th NMOS transistor (N5) and the 6th NMOS crystal
(N6) cut-off is managed, the gating module (104) is made to export first hysteresis voltage；
When the 6th NMOS transistor (N6) is on, the 2nd POMS transistors (P2) and the 5th NMOS crystal
Manage (N5) conducting, the first POMS transistors (P1), the third NMOS transistor (N3) and the 4th NMOS transistor (N4)
Cut-off makes the gating module (104) export second hysteresis voltage.
4. circuit according to claim 3, which is characterized in that the signal switching module (102) includes：First gating is opened
Close (K1) and the second gating switch (K2)；
When the feedback signal of the comparison module (103) is 1, the first gating switch (K1) conducting, described second
Gating switch (K2) ends, and the signal switching module (102) exports the target overvoltage and detects voltage；
When the feedback signal of the comparison module (103) is 0, the first gating switch (K1) cut-off, described second
Gating switch (K2) is connected, and the signal switching module (102) exports first hysteresis voltage or second hysteresis voltage
It is to be determined according to the output of the gating module (104).
5. circuit according to claim 4, which is characterized in that the circuit further includes the second control module (106)；
When the overvoltage crowbar is operating mode, the reference voltage is provided for the comparison module (103)；
When the overvoltage crowbar is test pattern, it is switched fast the reference voltage for the comparison module (103), is added
The response speed of the fast comparison module (103).
6. according to claim 1-5 any one of them circuits, which is characterized in that when the overvoltage crowbar is operating mode
When, the comparison module (103) is used for：
When the voltage that the signal switching module (102) exports is more than the reference voltage, comparison module (103) output
The feedback signal and overvoltage protection signal.
7. circuit according to claim 5, which is characterized in that described when the overvoltage crowbar is test pattern
Comparison module (103) is additionally operable to：
When the input reference voltage that second control module (106) switches the comparison module (103) is cut less than the signal
The output voltage of block (102) is changed the mold, the comparison module (103) generates overvoltage protection signal.
8. circuit according to claim 7, which is characterized in that the circuit further includes：First time delay module (107) is used for
Postponed to the enable signal of the comparison module (103), to stablize in the input of the comparison module (103), is opened
The enable signal of the comparison module (103), avoids the comparison module (103) by false triggering.
9. circuit according to claim 8, which is characterized in that the circuit further includes：Second time delay module (108) is used for
The pulsewidth of the overvoltage protection signal is postponed, to be identified well, and then turns off chip.
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| CN201610882518.1A CN106300246B (en) | 2016-09-30 | 2016-09-30 | Overvoltage crowbar |
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| CN107919654B (en) * | 2017-12-14 | 2019-07-09 | 浙江晶科能源有限公司 | An overcurrent and overtemperature protection circuit and MPPT chip |
| CN108134366B (en) * | 2017-12-21 | 2019-06-14 | 上海艾为电子技术股份有限公司 | A kind of overvoltage crowbar, over-voltage protection method and device |
| CN110806777B (en) * | 2019-12-02 | 2021-02-12 | 湖南品腾电子科技有限公司 | Low-power consumption small-area temperature compensation low-voltage detection circuit |
| CN113675817B (en) * | 2021-07-02 | 2022-04-12 | 富满微电子集团股份有限公司 | Overvoltage protection circuit, overvoltage protection method and chip |
| CN117728661B (en) * | 2023-11-14 | 2024-07-05 | 海信家电集团股份有限公司 | Voltage protection device, method and system and electronic equipment |
| CN117578344B (en) * | 2023-12-11 | 2024-08-09 | 北京伽略电子股份有限公司 | Overvoltage protection circuit, overvoltage protection method, electronic device and storage medium |
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Effective date of registration: 20210422 Address after: No.1, floor 4, building 10, No.303, group 3, liangfengding village, Zhengxing Town, Tianfu New District, Chengdu, Sichuan 610000 Patentee after: Sichuan Yichong Technology Co.,Ltd. Address before: 300457, Tianjin Binhai New Area, Tianjin Development Zone, No. 19 West Ring Road, TEDA service outsourcing Garden No. 2701-1 building, room 2 Patentee before: INTERNATIONAL GREEN CHIP (TIANJIN) Co.,Ltd. |