CN108666973A - A kind of adjustable high-precision thermal-shutdown circuit of threshold value - Google Patents
A kind of adjustable high-precision thermal-shutdown circuit of threshold value Download PDFInfo
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- CN108666973A CN108666973A CN201810527534.8A CN201810527534A CN108666973A CN 108666973 A CN108666973 A CN 108666973A CN 201810527534 A CN201810527534 A CN 201810527534A CN 108666973 A CN108666973 A CN 108666973A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/047—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using a temperature responsive switch
Abstract
A kind of adjustable high-precision thermal-shutdown circuit of threshold value, belongs to electronic circuit technology field.Temperature sense module includes diode-type NTC thermistor, and for the cathode of diode-type NTC thermistor as temperature detection end, anode connects the first reference current；The cathode voltage that subtracter block is used to subtract the anode voltage of diode-type NTC thermistor diode-type NTC thermistor obtains thermometric voltage；The input terminal of threshold setting module connects reference voltage, and output end exports threshold voltage；Threshold setting module includes trimming module, and trimming module trims code value for generating, and trims code value for adjusting threshold voltage；Control output module generates excess temperature signal for comparing thermometric voltage and threshold voltage, and according to comparison result.Thermal-shutdown circuit provided by the invention has the advantages that accuracy of detection is high, detection speed is fast and circuit structure is simple, while the rotection thresholds of circuit can also be adjusted.
Description
Technical field
The present invention relates to electronic circuit technologies, and in particular to a kind of adjustable high-precision thermal-shutdown circuit of threshold value can be used
In motor-drive circuit.
Background technology
Since many high power circuits are integrated in integrated circuit mostly, when environment temperature is excessively high or occur power supply short circuit,
When internal short-circuit, circuit power consumption can increased dramatically, and chip temperature excessively high can also lead to chip quick aging or permanent
Loss, therefore to prevent the above situation, generally require that thermal-shutdown circuit is arranged for chip.
Generally use power MOS as switching tube by taking motor-drive circuit as an example, in motor-drive circuit, when motor works
Electric current is larger, can generally reach tens amperes, electric current meeting bigger when stall or short-circuit conditions occur, therefore power MOS exists
Larger current must be flowed through when work, device temperature can be caused to rise, if cannot control in time may damage circuit.Therefore exist
It needs quickly to carry out accurately overheat protector to circuit in the application of power device.
Traditional thermal-shutdown circuit is generally made in driving chip or concatenates thermo-sensitive resistor on power MOS.If warm
Spend sampling module setting in the chip portion then can not accurately induced power MOS temperature, will produce prodigious error, if
Source or drain terminal the concatenation thermo-sensitive resistor of power MOS then will increase power, also will produce the heat of bigger.
Invention content
For existing for above-mentioned traditional thermal-shutdown circuit, error is big, measures the deficiencies of inaccurate place, and the present invention proposes one
Kind of the adjustable high-precision thermal-shutdown circuit of threshold value, has that temperature sampling is accurate quickly, precision is high, threshold value can reconcile circuit structure
The advantages that simple.
The technical scheme is that：
A kind of adjustable high-precision thermal-shutdown circuit of threshold value, including the setting of temperature sense module, subtracter block, threshold value
Module and control output module,
The temperature sense module includes diode-type NTC thermistor D1, the diode-type NTC thermistor D1's
Cathode connects the first reference current Iref1 as temperature detection end, anode；
The subtracter block is used to the anode voltage V1 of the diode-type NTC thermistor D1 subtracting two pole
The cathode voltage V2 of tubular type NTC thermistor D1 obtains thermometric voltage；
The input terminal of the threshold setting module connects reference voltage Vref0, and output end exports threshold voltage Vref1；
The threshold setting module includes trimming module, and the trimming module trims code value for generating, described to trim code
Value is for adjusting the threshold voltage Vref1；
The control output module is used for the thermometric voltage and the threshold voltage Vref1, and is tied according to comparing
Fruit generates excess temperature signal VOUT.
Specifically, when the thermal-shutdown circuit is used to detect motor-drive circuit, the diode-type NTC thermistor
The cathode of D1 is closely connect with the drain electrode of the power MOS pipe VD1 of the motor-drive circuit.
Specifically, the threshold setting module further includes the first operational amplifier OP1, the first NMOS tube NM1, the 2nd NMOS
Pipe NM2, third NMOS tube NM3, the 4th NMOS tube NM4, the 5th NMOS tube NM5, first resistor R1, second resistance R2, third electricity
R3, the 4th resistance R4 and the 5th resistance R5 are hindered,
The positive input of first operational amplifier OP1 connects the reference voltage V ref0, negative input connection the
One end of the source electrode and first resistor R1 of one NMOS tube NM1, output end connect the grid of the first NMOS tube NM1；First NMOS
The drain electrode connection supply voltage VCC of pipe NM1；
The drain electrode of the other end and the second NMOS tube NM2 of one end connection first resistor R1 of second resistance R2, the other end
Connect the drain electrode of one end and third NMOS tube NM3 of 3rd resistor R3；
The drain electrode of the other end and the 4th NMOS tube NM4 of one end connection 3rd resistor R3 of 4th resistance R4, the other end
Connect the drain electrode of the 5th NMOS tube NM5 and by being grounded after the 5th resistance R5；
The trimming module generation four trims code value and is separately connected the second NMOS tube NM2, third NMOS tube NM3, the 4th
The grid of NMOS tube NM4 and the 5th NMOS tube NM5, the second NMOS tube NM2, third NMOS tube NM3, the 4th NMOS tube NM4 and
The source electrode of five NMOS tube NM5 interconnects and exports the threshold voltage Vref1 as the output end of the threshold setting module.
Specifically, the threshold setting module further includes the first operational amplifier OP1, the first NMOS tube NM1, the 6th NMOS
Pipe NM6, the 7th NMOS tube NM7, the 8th NMOS tube NM8, the 9th NMOS tube NM9, the 6th resistance R6, the 7th resistance R7, the 8th electricity
R8, the 9th resistance R9 and the tenth resistance R10 are hindered, the trimming module generation four trims code value and is separately connected the 6th NMOS tube
The grid of NM6, the 7th NMOS tube NM7, the 8th NMOS tube NM8 and the 9th NMOS tube NM9,
The positive input of first operational amplifier OP1 connects the reference voltage V ref0, negative input connection the
One end of the drain electrode and the 6th resistance R6 of the source electrode, the 6th NMOS tube NM6 of one NMOS tube NM1, output end connect the first NMOS
The grid of pipe NM1；The drain electrode connection supply voltage VCC of first NMOS tube NM1；
One end of 7th resistance R7 connects drain electrode and the 6th resistance of the source electrode, the 7th NMOS tube NM7 of the 6th NMOS tube NM6
The other end of R6, the other end connect drain electrode and the 8th resistance R8 of the source electrode, the 8th NMOS tube NM8 of the 7th NMOS tube NM7
One end simultaneously exports the threshold voltage Vref1 as the output end of the threshold setting module；
One end of 9th resistance R9 connects drain electrode and the 8th resistance of the source electrode, the 9th NMOS tube NM9 of the 8th NMOS tube NM8
The other end of R8, the other end connect the source electrode of the 9th NMOS tube NM9 and by being grounded after the tenth resistance R10；
The trimming module generation four trims code value and is separately connected the 6th NMOS tube NM6, the 7th NMOS tube NM7, the 8th
The grid of NMOS tube NM8 and the 9th NMOS tube NM9.
Specifically, the subtracter block includes second operational amplifier OP2, eleventh resistor R11, twelfth resistor
R12, thirteenth resistor R13, the 14th resistance R14 and the tenth NMOS tube NM10,
Eleventh resistor R11 and twelfth resistor R12 series connection be attempted by the subtracter block minuend input terminal and
Between ground, series connection point connects the positive input of second operational amplifier OP2；
Thirteenth resistor R13 and the 14th resistance R14 series connection are attempted by the subtracting input and the of the subtracter block
Between the source electrode of ten NMOS tube NM10, series connection point connects the negative input of second operational amplifier OP2；
The output end of the grid connection second operational amplifier OP2 of tenth NMOS tube NM10, drain electrode connection supply voltage
VCC, source electrode export the thermometric voltage as the output end of the subtracter block and connect the second reference current Iref2.
Specifically, the control output module include comparator COMP1, the first phase inverter INV1, the second phase inverter INV2,
Third phase inverter INV3, the first PMOS tube PM1, the 11st NMOS tube NM11, the 12nd NMOS tube NM12, the first schmidt trigger
Device and the first capacitance C1,
The positive input of comparator COMP1 connects the threshold voltage Vref1, and negative input connects the thermometric
Voltage, output end connect the input terminal of the first phase inverter INV1；
The grid of first PMOS tube PM1 connects the output end of the grid and the first phase inverter INV1 of the 11st NMOS tube NM1,
Its source electrode connects third reference current Iref3, the leakage of the 11st NMOS tube NM11 and the 12nd NMOS tube NM12 of drain electrode connection
The input terminal of pole and the first Schmidt trigger and by being grounded after the first capacitance C1；
The source electrode of 11st NMOS tube NM11 and the 12nd NMOS tube NM12 is grounded；
The input terminal of third phase inverter INV3 connects enable signal EN, and output end connects the grid of the 12nd NMOS tube NM12
Pole；
The input terminal of second phase inverter INV2 connects the output end of the first Schmidt trigger, and output end exports the mistake
Warm signal VOUT.
Specifically, the temperature sense module further includes the 15th resistance R15, the diode-type NTC thermistor D1
Anode by being connect with the subtracter block after the 15th resistance R15.
Beneficial effects of the present invention are：Thermal-shutdown circuit provided by the invention has accuracy of detection height, detection speed fast
The simple advantage with circuit structure, while the rotection thresholds of circuit can also be adjusted.
Description of the drawings
Fig. 1 is a kind of a kind of realization structure chart of the adjustable high-precision thermal-shutdown circuit of threshold value proposed by the present invention.
Fig. 2 is the schematic diagram of trimming module.
Fig. 3 is the another of threshold setting module in a kind of adjustable high-precision thermal-shutdown circuit of threshold value proposed by the present invention
Kind realizes structural schematic diagram.
Specific implementation mode
Below according to drawings and examples, detailed description of the present invention operation principle.
The adjustable high-precision thermal-shutdown circuit of a kind of threshold value proposed by the present invention, including temperature sense module, subtracter
Module, threshold setting module and control output module, wherein temperature sense module includes diode-type NTC thermistor D1, profit
The characteristic for being increased and being reduced with temperature with the conduction voltage drop of diode-type NTC thermistor D1, by diode-type NTC thermistor
The cathode of D1 connects a first constant reference current Iref1 as temperature detection end, anode, generates the first reference current
The reference circuit of Iref1 carries out temperature-compensating to the first reference current Iref1 so that the first reference current Iref1 is not with temperature
Variation, to eliminate the error because of diode-type NTC thermistor D1 both end voltages caused by curent change.
By taking motor-drive circuit as an example, due to generally using power MOS pipe VD1 as switching tube in motor-drive circuit,
And the drain electrode temperature of power MOS pipe VD1 is usually highest, and drain material is generally metal, thermal conductivity is good, so by two poles
Closely connection is used for detecting power for the drain electrode of the cathode of tubular type NTC thermistor D1 and the power MOS pipe VD1 of motor-drive circuit
The temperature of metal-oxide-semiconductor VD1, temperature sense module can be tightly disposed in together with circuit under test, be located at by subtracter block, threshold value
The outside of setup module and the integrated chip of control output module, so that the temperature that temperature sense module detects is more accurate
Really.It, can be according to difference when cannot compare with threshold voltage Vref1 when diode-type NTC thermistor D1 both end voltages are relatively low
Applicable cases one the 15th resistance R15 is set in temperature sense module, the anode of diode-type NTC thermistor D1 is logical
It is connect with subtracter block after crossing the 15th resistance R15, so as to take guarantor to circuit in different temperature spots as needed
Shield measure so that overheat protector is more flexible and accurate, the 15th resistance R15 must have very low temperature coefficient so that its two
Terminal voltage does not vary with temperature, and reduces error.
The electric current of power MOS pipe consists of two parts, and a part is current of electric, and a part is to flow through diode-type NTC
The first reference current Iref1 of thermistor D1.Because the first reference current Iref1 is relative to the electricity for flowing through power MOS pipe VD1
Stream may diminish to ignore, therefore the extra power consumption generated on diode-type NTC thermistor D1 is very small, will not be because of
Power is excessive to increase additional heat to power MOS pipe VD1.The cathodic metal of diode-type NTC thermistor D1 directly pastes simultaneously
Onto the drain metal of power MOS pipe VD1, metal heat-conducting is good, understands the temperature of more rapidly more accurate transimission power metal-oxide-semiconductor VD1
Onto diode-type NTV thermistors D1 so that sampling is more accurate quick.
The operation principle of temperature sense module is：Gate drive signal VON is for controlling power MOS pipe VD1, power MOS
The drain current of pipe VD1 is ID, the temperature of power MOS pipe VD1 can rise with the increase of power, diode-type NTC temperature-sensitives
The anode of resistance D1 inputs the first constant reference current Iref1, and the voltage drop at both ends can be reduced as temperature increases.
Subtracter block is used to calculate the conduction voltage drop of diode-type NTC thermistor D1, and minuend input terminal connects
The anode voltage V1 of diode-type NTC thermistor D1 is met, subtracting input connects the moon of diode-type NTC thermistor D1
Pole tension V2, output end obtain thermometric voltage, and as diode-type NTC thermistor D1 (also protects in some embodiments
The sum of 15 resistance R15) both end voltage, the interference of the voltage versus temperature sampling between power MOS pipe VD1 source and drain is eliminated, is obtained
The voltage value at the diode-type NTC thermistor D1 both ends with temperature linearity variation pure to one.As shown in figures 1 and 3
A kind of circuit for giving subtracter block realizes structure, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13
It can be arranged as required to the resistance value of the 14th resistance R14, by eleventh resistor R11, twelfth resistor in some embodiments
R12, thirteenth resistor R13 and the 14th resistance R14 is set as just the same and resistance value is larger, due to the clamper of amplifier input terminal
Effect, the positive-negative input end voltage of second operational amplifier OP2 are equal.The anode voltage of diode-type NTC thermistor D1 is logical
Cross the positive input of eleventh resistor R11 input terminal subtracter block second operational amplifiers OP2, the leakage of power MOS pipe VD1
Pole tension is input to the negative input of second operational amplifier OP2 by thirteenth resistor R13, passes through the tenth NMOS tube NM10
Source electrode output thermometric voltage to control output module comparator COMP1 negative input.
Remember that the voltage of diode-type NTC thermistor D1 anodes is V1, the voltage of power MOS pipe VD1 drain electrodes is V2, according to
The characteristic of operational amplifier can derive that the voltage of second operational amplifier positive input is V1/2, so the 13rd electricity
Voltage on resistance R13 is reduced to V2-V1/2, i.e. the voltage at the 14th both ends resistance R14 is reduced to V2-V1/2, so the tenth NMOS tube
The voltage of NM10 source electrodes is：
I.e. by the voltage at diode-type NTC thermistor D1 (further including the 15th resistance R15 in some embodiments) both ends
Drop is output to the negative input of the second operational amplifier OP2 of subtracter block.
Threshold setting module generates threshold voltage Vref1 according to reference voltage V ref0, and is repaiied according to what trimming module generated
Code value is adjusted to adjust threshold voltage Vref1, the specific steps are the bases for being connected and fixed the positive input of the first operational amplifier OP1
Quasi- voltage Vref0, reference voltage V ref0 pass through electric resistance partial pressure, then control the conducting that MOS therein opens the light by trimming module, adjust
Save the threshold voltage Vref1 generated.A kind of circuit for trimming a code value realization knot is generated in trimming module as Fig. 2 gives
Structure, including the 16th resistance R16, fuse Pfuse, the second PMOS tube MP2, third PMOS tube PM3, the 13rd NMOS tube NM13,
14th NMOS tube NM14, the 15th NMOS tube NM15, the second Schmidt trigger and d type flip flop, the 13rd NMOS tube NM13
Grid leak interconnect and connect the grid and the 4th reference current of the 14th NMOS tube NM14 and the 15th NMOS tube NM15
Lref4, source electrode connect source electrode and the ground connection of the 14th NMOS tube NM14 and the 15th NMOS tube NM15；Second PMOS tube PM2
Grid leak interconnect and connect the 14th NMOS tube NM14 drain electrode and third PMOS tube PM3 grid, source electrode passes through the 16th
Supply voltage VCC is connected after resistance R16；The drain electrode and second of the 15th NMOS tube NM15 of drain electrode connection of third PMOS tube PM3
The input terminal of Schmidt trigger, source electrode connect one end of fuse Pfuse and as fuse control terminals；Fuse Pfuse's is another
One end connects supply voltage VCC；The data input pin of d type flip flop connects the output end of the second Schmidt trigger, and clock is defeated
Enter end connection clock signal CK, reset terminal connects enable signal EN, and Q output or the non-output ends of Q export one and trim code
Value.
The principle of trimming module is a current comparator, and wherein fuse Pfuse is electric current fuse, in fuse control terminal
Increase level i.e. fusible fuse Pfuse on Pad, before unblown, the resistance R of fuse PfusePfuseIt is similar to 0, after fusing
The resistance R of fuse PfusePfuseIt is open circuit close to infinity.The width of 14th NMOS tube NM14 and the 15th NMOS tube NM15
Length is than equal, when fuse Pfuse is unblown, RPfuse＜ ＜ R16, VO1, which has, reduces the electric current that road flows through third PMOS tube PM3
Trend, then so that VO1 output be high level, when fuse Pfuse fuses, RPfuse＞ ＞ R16, VO1 have increase and flow through
The trend of the electric current of three PMOS tube PM3, then VO1 outputs are low level.When trimming code value if necessary to multidigit, only need in parallel a plurality of
Code value generation circuit.
The structural schematic diagram of the threshold setting module in embodiment one, the first operational amplifier OP1 are given as shown in Figure 1
Positive input to meet reference voltage V ref0 be 1.2V, reference voltage V ref0 is divided into four by the 5th resistance R5 of first resistor R1-
A voltage value, respectively：
Four of trimming module output trim code value and are connected on the second NMOS tube to the grid of the 5th NMOS tube, when trimming code value
For high level when, corresponding metal-oxide-semiconductor is opened, and the threshold voltage Vref1 of output is the pipe drain voltage, but four exported every time
Position trim in code value can only have one for height, i.e., every time can only there are one corresponding metal-oxide-semiconductors to be connected, therefore this mode only has 4
Kind trims combination, but this partial pressure mode linearity is preferable, and precision is high.
Fig. 3 gives the structural schematic diagram of the threshold setting module in embodiment two, is arranged with the threshold value in embodiment one
Module is compared, and the connection type of metal-oxide-semiconductor is different.It is in embodiment two that the 6th NMOS tube NM6 is in parallel respectively to the 9th NMOS tube NM9
In the 6th resistance R6 to the both ends of the 9th resistance R9.Tie points of the threshold voltage Vref1 from the 7th resistance R7 and the 8th resistance R8
Output, it is anti-to the resistance on ground and the first operational amplifier OP1 that output voltage depends on threshold voltage Vref1 after trimming code value input
To input terminal to the ratio of resistance between ground.When the metal-oxide-semiconductor of resistance both ends parallel connection is opened, which is short-circuited, and trims code
Value has 16 kinds of combinations, but the linearity that this mode trims is undesirable, and the conducting resistance of metal-oxide-semiconductor can also influence voltage
Accuracy.
The threshold value electricity that the thermometric voltage and threshold setting module that control output module is used to export subtracter block generate
Pressure Vref1 is compared, and after threshold value of the temperature higher than setting, thermometric voltage is less than threshold voltage Vref1, comparator
COMP1 output HIGH voltages, the first phase inverter INV1 export low-voltage, using delay and shaping output excess temperature signal VOUT.Control
The positive input of comparator COMP1 meets preset threshold voltage Vref1 in output module processed, and negative input voltage is two poles
The voltage difference at tubular type NTC thermistor D1 (some embodiments further include the 15th resistance R15) both ends.Third reference current
Iref3, the first NMOS tube PM1, the 11st NMOS tube NM1 and the first capacitance C1 form delay loop, generate certain signal and prolong
Late, the enabled control output modules of enable signal EN, the first Schmidt trigger after waveform shaping to exporting.When initial, temperature compared with
Low, diode-type NTC thermistor D1 both end voltages drop is larger, and comparator COMP1 outputs are low, by the first reverser INV1
It is input to the grid of the first PMOS tube PM1 and the 11st NMOS tube NM11, the 11st NMOS hangs NM11 conductings, the first PMOS tube
PM1 ends, and the 11st NMOS tube NM11 drain voltages are lower by height, and the first capacitance C1 electric discharges, drain voltage is low.When temperature mistake
Height, diode-type NTC thermistor D1 voltage difference of the two ends reduces, when thermometric voltage V1-V2 is smaller than threshold voltage Vref1, than
It is height compared with device COMP1 outputs, the grid of the first PMOS tube PM1 and the 11st NMOS tube NM11 is input to by the first reverser INV1
Pole, the first PMOS tube PM1 conductings, the 11st NMOS tube NM11 cut-offs, the first PMOS tube PM1 drain voltages are got higher by low, third
Reference current Iref3 starts to the first capacitance C1 chargings, and the first PMOS tube PM1 drain voltages are slowly lifted, are applied by first close
After special trigger shaping, the rising edge of the first PMOS tube PM1 drain electrode export excess temperature signal VOUT to drive after generating certain delay
Dynamic circuit, takes corresponding safeguard measure, is such as input to motor-drive circuit and carrys out switch-off power metal-oxide-semiconductor VD1 so that motor driving electricity
Road enters protected mode.
Shown in sum up, the present invention proposes a kind of thermal-shutdown circuit, and subtracter block, threshold setting module and control is defeated
Go out module and is integrated into chip piece, and temperature sense module detects temperature using temperature sensitivity source diode formula NTC resistance D1
Degree variation, diode-type NTC resistance D1 setting are close to outside chip with element under test, such accuracy of detection higher, speed faster,
Circuit structure is also simpler；In addition thermal-shutdown circuit provided by the invention can lead to according to actual conditions adjusting threshold voltage
Overregulate the 15th resistance R15 resistance value and trimming module generate trim code value to adjust the rotection thresholds of circuit, Ke Yishi
In circuit for any required temperature protection.
Those skilled in the art can make various do not depart from originally according to the technical disclosures disclosed by the invention
Various other specific variations and combinations of essence are invented, these variations and combinations are still within the scope of the present invention.
Claims (7)
1. a kind of adjustable high-precision thermal-shutdown circuit of threshold value, which is characterized in that including temperature sense module, subtracter mould
Block, threshold setting module and control output module,
The temperature sense module includes diode-type NTC thermistor (D1), the diode-type NTC thermistor (D1)
Cathode connects the first reference current (Iref1) as temperature detection end, anode；
The subtracter block is used to the anode voltage (V1) of the diode-type NTC thermistor (D1) subtracting two pole
The cathode voltage (V2) of tubular type NTC thermistor (D1) obtains thermometric voltage；
The input terminal connection reference voltage (Vref0) of the threshold setting module, output end export threshold voltage (Vref1)；
The threshold setting module includes trimming module, and the trimming module trims code value for generating, described to trim code value use
In the adjustment threshold voltage (Vref1)；
The control output module is used for the thermometric voltage and the threshold voltage (Vref1), and according to comparison result
Generate excess temperature signal (VOUT).
2. the adjustable high-precision thermal-shutdown circuit of threshold value according to claim 1, which is characterized in that the overheat protector
Circuit is for when detecting motor-drive circuit, the cathode of the diode-type NTC thermistor (D1) and motor driving to be electric
The drain electrode of the power MOS pipe (VD1) on road closely connects.
3. the adjustable high-precision thermal-shutdown circuit of threshold value according to claim 1, which is characterized in that the threshold value setting
Module further includes the first operational amplifier (OP1), the first NMOS tube (NM1), the second NMOS tube (NM2), third NMOS tube
(NM3), the 4th NMOS tube (NM4), the 5th NMOS tube (NM5), first resistor (R1), second resistance (R2), 3rd resistor (R3),
4th resistance (R4) and the 5th resistance (R5),
The positive input of first operational amplifier (OP1) connects the reference voltage (Vref0), negative input connection the
One end of the source electrode and first resistor (R1) of one NMOS tube (NM1), output end connect the grid of the first NMOS tube (NM1)；The
The drain electrode connection supply voltage (VCC) of one NMOS tube (NM1)；
The drain electrode of the other end and the second NMOS tube (NM2) of one end connection first resistor (R1) of second resistance (R2), it is another
The drain electrode of one end and third NMOS tube (NM3) of end connection 3rd resistor (R3)；
The drain electrode of the other end and the 4th NMOS tube (NM4) of one end connection 3rd resistor (R3) of 4th resistance (R4), it is another
The drain electrode of the 5th NMOS tube (NM5) of end connection is simultaneously grounded by the 5th resistance (R5) afterwards；
The trimming module generation four trims code value and is separately connected the second NMOS tube (NM2), third NMOS tube (NM3), the 4th
The grid of NMOS tube (NM4) and the 5th NMOS tube (NM5), the second NMOS tube (NM2), third NMOS tube (NM3), the 4th NMOS tube
(NM4) it interconnects with the source electrode of the 5th NMOS tube (NM5) and exports the threshold value electricity as the output end of the threshold setting module
It presses (Vref1).
4. the adjustable high-precision thermal-shutdown circuit of threshold value according to claim 1, which is characterized in that the threshold value setting
Module further includes the first operational amplifier (OP1), the first NMOS tube (NM1), the 6th NMOS tube (NM6), the 7th NMOS tube
(NM7), the 8th NMOS tube (NM8), the 9th NMOS tube (NM9), the 6th resistance (R6), the 7th resistance (R7), the 8th resistance (R8),
9th resistance (R9) and the tenth resistance (R10), the trimming module generation four trim code value and are separately connected the 6th NMOS tube
(NM6), the grid of the 7th NMOS tube (NM7), the 8th NMOS tube (NM8) and the 9th NMOS tube (NM9),
The positive input of first operational amplifier (OP1) connects the reference voltage (Vref0), negative input connection the
The source electrode of one NMOS tube (NM1), the 6th NMOS tube (NM6) drain electrode and the 6th resistance (R6) one end, output end connection the
The grid of one NMOS tube (NM1)；The drain electrode connection supply voltage (VCC) of first NMOS tube (NM1)；
One end of 7th resistance (R7) connects the source electrode of the 6th NMOS tube (NM6), the drain electrode of the 7th NMOS tube (NM7) and the 6th electricity
The other end of (R6) is hindered, the other end connects the drain electrode and the 8th of the source electrode, the 8th NMOS tube (NM8) of the 7th NMOS tube (NM7)
One end of resistance (R8) simultaneously exports the threshold voltage (Vref1) as the output end of the threshold setting module；
One end of 9th resistance (R9) connects the source electrode of the 8th NMOS tube (NM8), the drain electrode of the 9th NMOS tube (NM9) and the 8th electricity
The other end of (R8) is hindered, the other end connects the source electrode of the 9th NMOS tube (NM9) and is grounded afterwards by the tenth resistance (R10)；
The trimming module generation four trims code value and is separately connected the 6th NMOS tube (NM6), the 7th NMOS tube (NM7), the 8th
The grid of NMOS tube (NM8) and the 9th NMOS tube (NM9).
5. the adjustable high-precision thermal-shutdown circuit of threshold value according to claim 1, which is characterized in that the subtracter mould
Block includes second operational amplifier (OP2), eleventh resistor (R11), twelfth resistor (R12), thirteenth resistor (R13),
14 resistance (R14) and the tenth NMOS tube (NM10),
Eleventh resistor (R11) and twelfth resistor (R12) series connection be attempted by the subtracter block minuend input terminal and
Between ground, series connection point connects the positive input of second operational amplifier (OP2)；
Thirteenth resistor (R13) and the series connection of the 14th resistance (R14) are attempted by the subtracting input and the of the subtracter block
Between the source electrode of ten NMOS tubes (NM10), series connection point connects the negative input of second operational amplifier (OP2)；
The output end of the grid connection second operational amplifier (OP2) of tenth NMOS tube (NM10), drain electrode connection supply voltage
(VCC), source electrode exports the thermometric voltage as the output end of the subtracter block and connects the second reference current
(Iref2)。
6. the adjustable high-precision thermal-shutdown circuit of threshold value according to claim 1, which is characterized in that the control output
Module includes comparator (COMP1), the first phase inverter (INV1), the second phase inverter (INV2), third phase inverter (INV3), first
PMOS tube (PM1), the 11st NMOS tube (NM11), the 12nd NMOS tube (NM12), the first Schmidt trigger and the first capacitance
(C1),
The positive input of comparator (COMP1) connects the threshold voltage (Vref1), and negative input connects the thermometric
Voltage, output end connect the input terminal of the first phase inverter (INV1)；
The grid of first PMOS tube (PM1) connects the output of the grid and the first phase inverter (INV1) of the 11st NMOS tube (NM1)
End, source electrode connect third reference current (Iref3), drain electrode the 11st NMOS tube (NM11) of connection and the 12nd NMOS tube
(NM12) input terminal of drain electrode and the first Schmidt trigger is simultaneously grounded by the first capacitance (C1) afterwards；
The source electrode of 11st NMOS tube (NM11) and the 12nd NMOS tube (NM12) is grounded；
The input terminal connection enable signal (EN) of third phase inverter (INV3), output end connect the 12nd NMOS tube (NM12)
Grid；
The input terminal of second phase inverter (INV2) connects the output end of the first Schmidt trigger, and output end exports the excess temperature
Signal (VOUT).
7. the adjustable high-precision thermal-shutdown circuit of threshold value according to claim 1, which is characterized in that the temperature sense
Module further includes the 15th resistance (R15), and the anode of the diode-type NTC thermistor (D1) passes through the 15th resistance
(R15) it is connect afterwards with the subtracter block.
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| CN201810527534.8A CN108666973B (en) | 2018-05-29 | 2018-05-29 | High-precision over-temperature protection circuit with adjustable threshold |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810527534.8A CN108666973B (en) | 2018-05-29 | 2018-05-29 | High-precision over-temperature protection circuit with adjustable threshold |
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| CN108666973A true CN108666973A (en) | 2018-10-16 |
| CN108666973B CN108666973B (en) | 2020-02-04 |
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| CN109801580A (en) * | 2018-12-24 | 2019-05-24 | 惠科股份有限公司 | Display panel and its overcurrent protection method and computer readable storage medium |
| CN109861674A (en) * | 2019-04-09 | 2019-06-07 | 深圳市万微微电子技术有限公司 | A kind of realization circuit of high-precision absolute voltage comparator |
| CN110320952A (en) * | 2019-07-22 | 2019-10-11 | 苏州欧普照明有限公司 | A kind of thermal-shutdown circuit and system |
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| CN115588965A (en) * | 2022-11-11 | 2023-01-10 | 上海芯龙半导体技术股份有限公司南京分公司 | Over-temperature protection circuit and over-temperature protection chip |
| CN116560344A (en) * | 2023-06-05 | 2023-08-08 | 国网甘肃省电力公司临夏供电公司 | Cloud platform-based remote fault diagnosis system for power grid equipment |
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