CN208239499U - A kind of pin multiplexing system applied to current sensor chip - Google Patents
A kind of pin multiplexing system applied to current sensor chip Download PDFInfo
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- CN208239499U CN208239499U CN201720924971.4U CN201720924971U CN208239499U CN 208239499 U CN208239499 U CN 208239499U CN 201720924971 U CN201720924971 U CN 201720924971U CN 208239499 U CN208239499 U CN 208239499U
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Abstract
The utility model relates to the multiplexing technology fields of current sensor chip pin, specially a kind of pin multiplexing system applied to current sensor chip, its pin multiplexing that can be realized current sensor chip, it includes current sensor chip, it is characterized in that, the voltage value of detection signal output pin or the output of zero current biasing voltage signal pin to the current sensor chip is handled before output, when flowing through the controller to be measured of the current sensor chip, detection signal output pin or the voltage value curve of zero current biasing voltage signal pin output can change Indication Characteristics.
Description
Technical field
The present invention relates to the multiplexing technology fields of current sensor chip pin, specially a kind of to be applied to current sensor
The pin multiplexing system of chip.
Background technique
Current sensor chip is to be formed using magnetic sensor technologies by (or external) electrical conductor inside induction chip
Magnetic field flow through the amplitude of current signal to be measured and polar chip on conductor to obtain.This chip is widely used in industry
Control, household electrical appliances and other fields.Since the volume of equipment increasingly reduces, user wishes obtaining current sensor of good performance
While chip, it is also desirable to which the area of current sensor chip and its peripheral circuit occupancy pcb board is small as far as possible.
Fig. 1 shows the pin definitions and application circuit of a kind of typical current sensor chip: wherein 100 be that electric current passes
Sensor chip；101 ~ 104 be four electric current pins, and external electric current to be measured passes through their inflow/outflow chips.105 be chip
Ground pin, 108 be the power pin of chip；107 be the detection signal output pin of chip, and output pin voltage is with stream
Enter the size of current and polarity to be measured of chip and change, and 106 be chip zero current biasing voltage signal pin, output letter
Number with when the electric current to be measured of inflow/outflow chip is zero the voltage value of 107 pins it is equal, it may be assumed that provide an electric current
The reference signal of measurement.The above pin definitions and application circuit provide basic current sense function.
Other than providing basic current sense function, in the application with power semiconductor, user is wished to
It is enough to provide overcurrent indication signal after electric current to be measured is more than a certain range, so as to turn off semiconductor devices in time, avoid its
Damage in the case of high current, protection response time needed for typical power semiconductor are not more than 3 microseconds.
With reference to Fig. 2, wherein 202 be measured signal pin (107 pins of corresponding diagram 1), 203 be zero current bias voltage letter
Number pin (106 pins of corresponding diagram 1).Fig. 3 is when flowing through chip curent change to be measured, and the signal of 202 pins and 203 pins becomes
Change situation, wherein straight line 301 is the voltage signal variation of 202 pins output, and dotted line 302 is the voltage signal of 203 pins output
Variation.It can be seen that the voltage of 202 pins is with the current polarity to be measured and size variation for flowing through conductor, and the voltage of 203 pins is then not
Change with the curent change to be measured for flowing through chip conductors, voltage value is waited for when the electric current to be measured for flowing through chip conductors is zero
The voltage value for surveying signal pin (i.e. 202 pins) is equal.In Fig. 3, current value 303 and current value 304 are the need being mentioned above
Will be to the current threshold that power semiconductor is protected, and voltage value 305 and voltage value 306 are then that signal output pin exists
Output voltage threshold signal under the conditions of current threshold.
As it is desirable that unnecessary noise signal can be filtered out, current sensor chip usually all can be in signal output end
Guarantee good noise characteristic using low-pass filter 201 before (202 pins in Fig. 2), but low-pass filter can reduce
The speed of transient response.Under the conditions of usual acceptable noise characteristic, the transient response speed of signal output end is generally big
In 5 ~ 10 microseconds.Since overcurrent indication signal is also a kind of transient response, so the signal output end with low-pass filter is believed
It number is difficult to meet and the requirement of high speed overcurrent indication signal is provided.The i.e. existing each pin of current sensor chip is only single
Function cannot be multiplexed between pin, when needing to realize more multi-functional, will increase number of pins, thus increase chip cost and
Its occupied area on circuit boards.
Summary of the invention
In view of the above-mentioned problems, the present invention provides a kind of pin multiplexing system applied to current sensor chip, energy
Enough realize the pin multiplexing of current sensor chip.
Its technical solution is such that a kind of pin multiplexing system applied to current sensor chip comprising electric current
Sensor chip, which is characterized in that be provided with measured signal output module and low-pass filtering in the current sensor chip
Device, which is characterized in that be additionally provided with voltage processing module in the current sensor chip, the voltage processing module includes
Two comparators and a multiple selector, the output end of two comparators are separately connected the control input of multiple selector
End, when flowing through the controller to be measured of the current sensor chip, the detection signal of the current sensor chip
Output pin or zero current biasing voltage signal pin export the indication signal of controller to be measured.
It is further characterized by the inputs of the output end connection low-pass filter of the measured signal output module
One input terminal at end and the voltage processing module, the output end of the low-pass filter are the detection signal efferent duct
Foot, the another output of the measured signal output module connects another input terminal of the voltage processing module, described
The output end of voltage processing module is the zero current biasing voltage signal pin；
The input terminal of the output end connection low-pass filter of the measured signal output module and voltage processing
One input terminal of module, the output end of the low-pass filter connect another input terminal of the voltage processing module, institute
The output end for stating voltage processing module is the detection signal output pin, another output of the measured signal output module
End is the zero current biasing voltage signal pin；
The comparator is the high-speed comparator with hysteresis characteristic.
After system of the invention, voltage processing module joined, when flowing through the to be measured of the current sensor chip
When controller, the voltage value curve change for detecting signal output pin or the output of zero current biasing voltage signal pin refers to
Show characteristic, so that the curve of two kinds of different characteristics can be exported by realizing a pin, realizes the pipe of current sensor chip
Foot multiplexing.
Detailed description of the invention
Fig. 1 is current sensor chip pin schematic diagram；
Fig. 2 is current sensor chip interior schematic illustration；
Fig. 3 is to flow through current sensor chip current change detection signal output pin and zero current biasing voltage signal pipe
Foot output voltage curve figure；
Fig. 4 is one circuit diagram of embodiment；
Fig. 5 is the corresponding electric current to be measured and voltage change schematic diagram of embodiment one.
Fig. 6 is two circuit diagram of embodiment；
Fig. 7 is the corresponding electric current to be measured and voltage change schematic diagram of embodiment two.
Specific embodiment
See Fig. 4, shown in Fig. 5, a kind of embodiment one: pin multiplexing system applied to current sensor chip comprising
Current sensor chip, the interior of voltage processing current sensor chip are provided with measured signal output module 400, low-pass filter
401 and voltage processing module 404, the input terminal of the output end connection low-pass filter 401 of measured signal output module 400
With an input terminal of voltage processing module 404, the output end of low-pass filter 401 is detection signal output pin 402, to be measured
Another input terminal of the another output connection voltage processing module 404 of signal output module 400, voltage processing module
404 output end be zero current biasing voltage signal pin 403, wherein voltage processing module 404 include multiple selector 404E,
High-speed comparator 404C, 404D with hysteresis characteristic, measured signal output module 400 are exported without low-pass filter 401
Voltage signal 405 and zero current biasing voltage signal 406,404A and 404B are respectively that the high and low of voltage threshold need to be protected to ration the power supply
Pressure value is output to the control of multiple selector 404E with zero current biasing voltage signal 406 by high-speed comparator 404C, 404D
End C1, C2 processed, voltage signal 405 are input to the input terminal S2 and low-pass filter 401 of multiple selector 404E, multiple selector
404E exports zero current biasing voltage signal, and the output detection signal of low-pass filter 401, voltage shows with curent change to be measured at this time
It is intended to as shown in figure 5, straight line 501 is the voltage of 402 pins with the current polarity to be measured and size variation for flowing through conductor, curve
502 be zero current biasing voltage signal, 505 and 506 it is corresponding be output voltage threshold signal under the conditions of current threshold, work as stream
Controller to be measured 503 through chip conductors or when 504, which is no longer zero current offset signal, and is become
The indication signal of controller to be measured, indication signal voltage value are in opposite side with the voltage signal of signal output pin
To, it may be assumed that when current value forward direction to be measured is more than threshold value, indication signal is low level；When current value to be measured is reversely more than threshold value, instruction
Signal is high level.
See Fig. 6, shown in Fig. 7, a kind of embodiment two: pin multiplexing system applied to current sensor chip comprising
Current sensor chip, the interior of voltage processing current sensor chip are provided with measured signal output module 600, low-pass filter
601 and voltage processing module 604, the input terminal of the output end connection low-pass filter 601 of measured signal output module 600
The another of voltage processing module 604 is connected with the output end of an input terminal of voltage processing module 604, low-pass filter 601
A input terminal, the output end of voltage processing module 604 are detection signal output pin 602, measured signal output module 600 it is another
One output end is zero current biasing voltage signal pin 603, wherein voltage processing module 604 include multiple selector 604E,
High-speed comparator 604C, 604D with hysteresis characteristic, measured signal output module 600 are exported without low-pass filter 601
Voltage signal 605 and zero current biasing voltage signal, 604A and 604B are respectively the high and low voltage limit that need to protect voltage threshold
Value is output to control terminal C1, C2 of multiple selector 604E, electricity with voltage signal 605 by high-speed comparator 604C, 604D
Pressure signal 605 is input to the input terminal S2 of multiple selector 604E, multichannel choosing by the voltage signal 406 of low-pass filter 604
Device 604E output detection signal is selected, voltage and curent change schematic diagram to be measured are as shown in fig. 7, curve 701 is 602 pins at this time
For voltage with the current polarity to be measured and size variation for flowing through conductor, straight line 702 is zero current biasing voltage signal, 705 and 706 pairs
What is answered is the output voltage threshold signal under the conditions of current threshold, when the controller to be measured 703 for flowing through chip conductors or
When 704, detection signal output is no longer zero current offset signal, and becomes the indication signal of controller to be measured,
Indication signal voltage value is in opposite direction with the voltage signal of signal output pin, it may be assumed that current value forward direction to be measured is more than threshold value
When, indication signal is high level；When current value to be measured is reversely more than threshold value, indication signal is low level.
It can be seen that by above-mentioned two embodiment by changing detection signal output pin and zero current bias voltage letter
The curve characteristic of number pin output, realizes the function of pin multiplexing.
Claims (4)
1. a kind of pin multiplexing system applied to current sensor chip comprising current sensor chip, the electric current pass
Measured signal output module and low-pass filter are provided in sensor chip, which is characterized in that the current sensor chip
In be additionally provided with voltage processing module, the voltage processing module includes two comparators and a multiple selector, two
The output end of the comparator is separately connected the control signal of multiple selector, when flow through the current sensor chip to
When surveying controller, the detection signal output pin or zero current biasing voltage signal pin of the current sensor chip
Export the indication signal of controller to be measured.
2. a kind of pin multiplexing system applied to current sensor chip according to claim 1, which is characterized in that institute
State the output end connection low-pass filter of measured signal output module input terminal and one of the voltage processing module
Input terminal, the output end of the low-pass filter are the detection signal output pin, the measured signal output module it is another
One output end connects another input terminal of the voltage processing module, and the output end of the voltage processing module is described zero
Current offset voltage signal pin.
3. a kind of pin multiplexing system applied to current sensor chip according to claim 1, which is characterized in that institute
State the output end connection low-pass filter of measured signal output module input terminal and one of the voltage processing module
Input terminal, the output end of the low-pass filter connect another input terminal of the voltage processing module, the voltage processing
The output end of module is the detection signal output pin, and the another output of the measured signal output module is described zero
Current offset voltage signal pin.
4. a kind of pin multiplexing system applied to current sensor chip according to claim 1, which is characterized in that institute
Stating comparator is the high-speed comparator with hysteresis characteristic.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720924971.4U CN208239499U (en) | 2017-07-28 | 2017-07-28 | A kind of pin multiplexing system applied to current sensor chip |
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| CN201720924971.4U CN208239499U (en) | 2017-07-28 | 2017-07-28 | A kind of pin multiplexing system applied to current sensor chip |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107340414A (en) * | 2017-07-28 | 2017-11-10 | 无锡思泰迪半导体有限公司 | A kind of pin multiplexing method and system applied to current sensor chip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107340414A (en) * | 2017-07-28 | 2017-11-10 | 无锡思泰迪半导体有限公司 | A kind of pin multiplexing method and system applied to current sensor chip |
| CN107340414B (en) * | 2017-07-28 | 2024-02-13 | 杭州思泰微电子有限公司 | Pin multiplexing method and system applied to current sensor chip |
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Effective date of registration: 20221213 Address after: No. 295, Building 17, No. 2723, Fuchunwan Avenue, Chunjiang Street, Fuyang District, Hangzhou, Zhejiang, 310000 Patentee after: Hangzhou Sitai Microelectronics Co.,Ltd. Address before: 214028 No. 16, Changjiang Road, Xinwu District, Wuxi City, Jiangsu Province Patentee before: STEADICHIPS Inc. |