CN106526504A - Power supply management chip and mobile device - Google Patents
Power supply management chip and mobile device Download PDFInfo
- Publication number
- CN106526504A CN106526504A CN201610820648.2A CN201610820648A CN106526504A CN 106526504 A CN106526504 A CN 106526504A CN 201610820648 A CN201610820648 A CN 201610820648A CN 106526504 A CN106526504 A CN 106526504A
- Authority
- CN
- China
- Prior art keywords
- management chip
- power supply
- current
- power management
- supply output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Tests Of Electronic Circuits (AREA)
Abstract
The invention discloses a power supply management chip and a mobile device. A current detection circuit is integrated in the power supply management chip. The current detection circuit detects the output current of a power supply output pin coupled thereto, so that the output current of the power supply output pin can be viewed and detected through a debugging instruction. The output current of the power supply management chip is monitored in real time, and loss caused by abnormal operation of the power supply management chip can be prevented.
Description
Technical field
The present invention relates to electronic applications, more particularly to a kind of power management chip and mobile device.
Background technology
A power management chip (PMU) to system power supply, the master of the chip is usually constructed with current mobile device
Want function be to all module for power supply of mobile device, and as the running voltage of the disparate modules of mobile device may be different,
Therefore power management chip PMU generally has multiple power supplies output.For example, in the MSM8909 chips of high pass, there are 2 road DCDC
(S1, S2) and 18 road LDO (L1～L18), wherein, independently export per power supply all the way, and all phases not to the utmost of the output voltage per road
Together.
In power management chip is tested and debugged, some wrong (bug), such as quiescent current is frequently encountered
Bigger than normal, operating current problem bigger than normal etc, and test these electric currents and very bother, require a great deal of time, sometimes
Mainboard can possibly even be damaged.
The content of the invention
The invention mainly solves the technical problem of providing a kind of power management chip and mobile device, power supply is can solve the problem that
Managing chip tests the problem of output current.
For solving above-mentioned technical problem, one aspect of the present invention is：A kind of power management chip, institute are provided
State power management chip and be provided with an at least power supply output pin, the power management chip passes through the power supply output pin pair
External equipment is powered, and the power management chip has been internally integrated current detection circuit, and the current detection circuit is used for
The power supply output pin is coupled, and detects the output current of the power supply output pin.
Wherein, the power management chip is further provided with an at least current detecting pin, so that the current detecting
Circuit is coupled with the current sample element being arranged at outside the power management chip by the current detecting pin, institute
State current sample element to couple with the power supply output pin, and the output current to the power supply output pin is sampled.
Wherein, be further integrated with current sample element inside the power management chip, the current sample element with
The power supply output pin is coupled, and the output current to the power supply output pin is sampled.
Wherein, the power management chip further includes digital signal processor, the digital signal processor coupling
The crossing detector circuit, carries out signal processing for the detection signal to the current detection circuit, to calculate the electricity
The output current of source output pin.
Wherein, the digital signal processor further reports the output current according to debugging instruction.
Wherein, the current detection circuit includes analog-digital converter and amplifying circuit, and the amplifying circuit is provided with first
Input, the second input and outfan, the analog-digital converter are coupled to the amplifying circuit with the Digital Signal Processing
Between device, wherein described first input end and second input are coupled to the electric current coupled with the power supply output pin and are adopted
Voltage difference between the first input end and second input is amplified by the two ends of sample element, the amplifying circuit
The analog-digital converter is arrived in output afterwards, and the analogue signal that the amplifying circuit is exported is converted to digital letter by the analog-digital converter
Number, and output carries out signal processing in the digital signal processor.
Wherein, the amplifying circuit includes amplifier, first resistor, second resistance, 3rd resistor and the 4th resistance；Its
In, the first resistor is coupled between the inverting input of the first input end and the amplifier；The second resistance
It is coupled between second input and the in-phase input end of the amplifier；Described 3rd resistor one end is coupled to described
Between the inverting input of one resistance and the amplifier, the 3rd resistor other end is coupled to the output of the amplifier
End；Described 4th resistance one end is coupled between the in-phase input end of the second resistance and the amplifier, and the described 4th is electric
Resistance other end ground connection.
Wherein, the power supply output pin is DC-DC power supply output pin, and the current sample element is arranged at
The outside of the power management chip, and the filter circuit coupled with the DC-DC power supply output pin carries out coupling
Connect, the power management chip is provided with first for coupling with the first input end and the second input of the amplifying circuit respectively
Current detecting pin and the second current detecting pin, and then by the first current detecting pin and the second current detecting pin
Couple the two ends of the current sample element.
Wherein, the power supply output pin is low voltage difference power supply output pin, and the power management chip is further integrated
There is current sample element, the current sample element is coupled with the low voltage difference power supply output pin, the of the amplifying circuit
One input and second input are respectively coupled to the two ends of the current sample element.
For solving above-mentioned technical problem, another technical solution used in the present invention is：A kind of mobile device is provided, including
Any one mentioned above power management chip.
The invention has the beneficial effects as follows：The situation of prior art is different from, the present invention is internally integrated in power management chip
Current detection circuit, the output current of the power supply output pin being coupled with it by current detection circuit detection, by adjusting
Examination instruction can check the output current of the power supply output pin for detecting, without the need for building which outside power management chip
He detects that circuit can just realize the output current of real-time monitoring power management chip, such that it is able to prevent power management chip work
Make abnormal causing damage.
Description of the drawings
Fig. 1 is the structural representation of power management chip first embodiment of the present invention；
Fig. 2 be Fig. 1 power management chip in one embodiment of current detection circuit electrical block diagram；
Fig. 3 is the structural representation of power management chip second embodiment of the present invention；
Fig. 4 is the structural representation of 3rd embodiment of power management chip of the present invention；
Fig. 5 is the structural representation of one embodiment of mobile device of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Fig. 1 is referred to, Fig. 1 is the structural representation of one embodiment of power management chip of the present invention.
As shown in figure 1, power management chip of the present invention 10 is provided with an at least power supply output pin S1, power management chip
10 are powered to external equipment by power supply output pin S1, and power management chip 10 has been internally integrated current detection circuit
101, current detection circuit 101 is used for coupling power supply output pin S1, and detects the output current of power supply output pin S1.
Wherein, power management chip 10 is further provided with an at least current detecting pin, so that current detection circuit 101
Coupled with the current sample element 102 being arranged at outside power management chip 10 by current detecting pin, current sample
Element 102 is sampled with power supply output pin S1 couplings, and the output current to power supply output pin S1.
Specifically, in an application examples, current sample element 102 is a sampling resistor, due to the resistance of sampling resistor
Low, precision is high, and the resistance of general sampling resistor can be selected in less than 1 ohm, belong to milliohm level noninductive resistance, and precision typically can
It is selected within ± 1%, during the purposes of requirements at the higher level, is even up to 0.01%, in circuit will not using the low sampling resistor of resistance
Obvious shunting/partial pressure is produced to the output current of power supply output pin S1, it is normal right so as to not interfere with power management chip 10
Outer power supply.Now, as shown in figure 1, power management chip 10 is provided with coupling between two current detecting pin S2 and S3, S2 and S3
A sampling resistor R is met, sampling resistor R is arranged on the outside of power management chip 10.
Certainly, in other application example, current sample element 102 can be that other do not affect power management chip 10 normal
The element of supplying power for outside.
Fig. 1 is further regarded to, as shown in figure 1, power management chip 10 further includes digital signal processor 103, number
103 coupling circuit of word signal processor detects circuit 101, carries out at signal for the detection signal to current detection circuit 101
Reason, to calculate the output current of power supply output pin S1.
For example, the detection signal of the output of crossing detector circuit 101 is voltage signal, and current sample element 102 is a sampling
Resistance, after digital signal processor 103 receives the voltage signal, carries out signal processing to the voltage signal, calculates this and adopt
The voltage difference at sample resistance two ends, then can calculate the current value through the sampling resistor, and the current value is power supply output and draws
The output current of foot S1.
Wherein, digital signal processor 103 further reports the output current of power supply output pin S1 according to debugging instruction.
Specifically, after digital signal processor 103 calculates the output current of power supply output pin S1, if receiving
The debugging instruction of layer debugging acid, then report the output current of power supply output pin S1, so that engineer is debugged by upper strata
Instrument can check the output current of power supply output pin S1, and then can be adopted in 10 operation irregularity of power management chip in time
Take corresponding measure, it is to avoid cause greater loss.
Refer to Fig. 2, Fig. 2 be Fig. 1 power management chip 10 in current detection circuit 101 electrical block diagram.
As shown in Fig. 2 current detection circuit 101 includes analog-digital converter 201 and amplifying circuit 202, amplifying circuit 202 sets
First input end 2021, the second input 2022 and outfan 2023 is equipped with, analog-digital converter 201 is coupled to amplifying circuit 202
Between digital signal processor 103, wherein first input end 2021 and the second input 2022 are coupled to and are drawn with power supply output
The two ends of the current sample element 102 of foot S1 couplings, amplifying circuit 202 by first input end 2021 and the second input 2022 it
Between voltage difference be amplified after output to analog-digital converter 201, the simulation that amplifying circuit 202 is exported by analog-digital converter 201
Signal is converted to digital signal, and output carries out signal processing in digital signal processor 103.
Specifically, in above-mentioned application examples, current sample element 102 is a sampling resistor, power supply output pin S1 outputs
Electric current through sampling resistor, produce voltage difference at sampling resistor two ends, it is first defeated that the voltage difference is transferred to amplifying circuit 202
Enter between end 2021 and the second input 2022, after the amplification of amplifying circuit 202, output is carried out to analog-digital converter 201
Analog digital conversion, the digital signal after finally changing are transferred to the digital signal processor 103 with the coupling of current detection circuit 101
In carry out signal processing.
Fig. 2 is further regarded to, as shown in Fig. 2 amplifying circuit 202 includes amplifier 2024, first resistor R1, second resistance
R2,3rd resistor R3 and the 4th resistance R4；Wherein, first resistor R1 is coupled to the anti-of first input end 2021 and amplifier 2024
Between phase input 20241；Second resistance R2 is coupled to the in-phase input end 20242 of the second input 2022 and amplifier 2024
Between；3rd resistor R3 one end is coupled between first resistor R1 and the inverting input 20241 of amplifier 2024, other end coupling
It is connected to the outfan 2023 of amplifier 2024；4th resistance R4 one end is coupled to second resistance R2 and the homophase of amplifier 2024 is defeated
Enter between end 20242, other end ground connection.
Specifically, amplifying circuit 202 is difference scaling circuit, for by first input end 2021 and the second input
Voltage difference between 2022 makes scaling up and exports.Wherein, amplifier 2024 is integrated operational amplifier, with very high
Amplification, signal conveniently carry out follow-up signal processing after amplification；First resistor R1, second resistance R2,3rd resistor
The resistance of R3 and the 4th resistance R4 is arranged according to the amplification coefficient of amplifying circuit, is not specifically limited herein.
In above-mentioned embodiment, the electric current that power management chip will be coupled with power supply output pin by current detecting pin
The voltage difference at sampling element two ends puts on the input of the current detection circuit of chip internal, by current detection circuit, number
Word signal processing circuit and sampling element can calculate the output current value of power supply output pin, so as to realize real-time detection electricity
The output current of the power supply output pin of source control chip, and the output electricity can be checked at any time by upper strata debugging acid
Stream, facilitates engineer to be tested to power management chip and debugged, prevents power management chip operation irregularity from causing damage.
Fig. 3 is referred to, Fig. 3 is the structural representation of power management chip second embodiment of the present invention.Fig. 3 and Fig. 1 is tied
Structure is similar to, and here is omitted, and difference is that power supply output pin S1 is DC-DC power supply output pin in Fig. 3,
Current sample element 302 is arranged at the outside of power management chip 30, and is coupled with DC-DC power supply output pin S1
Filter circuit 304 coupled, power management chip 30 be provided with respectively with the first input end 2021 of amplifying circuit 202 and
The first current detecting pin S2 and the second current detecting pin S3 of the coupling of the second input 2022, and then examined by the first electric current
Survey the two ends of pin S2 and the second current detecting pin S3 coupling current samples element 302.
Wherein, filter circuit 304 includes：Filter capacitor C and power inductance L, filter capacitor C one end is coupled to direct current and turns straight
Between stream power supply output pin S1 and power inductance L, other end ground connection, the power inductance L other ends and 302 coupling of current sample element
Connect.Due to the characteristic that the characteristic that electric capacity leads to exchange resistance direct current is exchanged with the logical direct current resistance of inductance, the signal Jing of pin S1 outputs is filtered
Wave circuit 304 filters Alternating Component therein, and only direct current signal is input to current sample element 302 and is sampled.
In above-mentioned embodiment, current sample element is arranged at the outside of power management chip, and in other embodiment
In, current sample element can be integrated in inside power management chip.
Referring particularly to Fig. 4, Fig. 4 is the structural representation of 3rd embodiment of power management chip of the present invention.Fig. 4 and Fig. 1
Structure is similar to, and is not repeated herein, is further integrated with current sample element 402 inside difference power management chip 40,
Current sample element 402 is sampled with power supply output pin S1 couplings, and the output current to power supply output pin S1, need not
It is extra that current detecting pin is set.
Specifically, in an application examples, power supply output pin S1 be low voltage difference power supply output pin, power management chip
40 are further integrated with current sample element 402, current sample element 402 and low voltage difference power supply output pin S1 couplings, amplify
The first input end 2021 of circuit 202 and the second input 2022 are respectively coupled to the two ends of current sample element 402.
In above-mentioned embodiment, power management chip passes through current detection circuit, sampling element and the numeral being internally integrated
Signal processor can just detect the output current of power supply output pin, so as to realize the electricity of real-time detection power management chip
The output current of source output pin, and the output current can be checked at any time by upper strata debugging acid, facilitate engineer couple
Power management chip is tested and is debugged, and prevents power management chip operation irregularity from causing damage.
Fig. 5 is referred to, Fig. 5 is the structural representation of one embodiment of mobile device of the present invention.As shown in figure 5, of the invention
Mobile device 50 includes any one power management chip in first, second or third embodiment of power management chip of the present invention
501。
Embodiments of the present invention are the foregoing is only, the scope of the claims of the present invention is not thereby limited, it is every using this
Equivalent structure or equivalent flow conversion that description of the invention and accompanying drawing content are made, or directly or indirectly it is used in other correlations
Technical field, is included within the scope of the present invention.
Claims (10)
1. a kind of power management chip, it is characterised in that the power management chip is provided with an at least power supply output pin, institute
State power management chip to be powered external equipment by the power supply output pin, the power management chip is internally integrated
There is current detection circuit, the current detection circuit is used for coupling the power supply output pin, and detects that the power supply output is drawn
The output current of foot.
2. power management chip according to claim 1, it is characterised in that the power management chip is further provided with
An at least current detecting pin so that the current detection circuit by the current detecting pin be arranged at the power supply pipe
The current sample element of reason chip exterior is coupled, and the current sample element is coupled with the power supply output pin, and right
The output current of the power supply output pin is sampled.
3. power management chip according to claim 1, it is characterised in that further collect inside the power management chip
Into there is current sample element, the current sample element is coupled with the power supply output pin, and to the power supply output pin
Output current sampled.
4. power management chip according to claim 1, it is characterised in that the power management chip further includes number
Word signal processor, the digital signal processor couple the crossing detector circuit, for the current detection circuit
Detection signal carries out signal processing, to calculate the output current of the power supply output pin.
5. power management chip according to claim 4, it is characterised in that the further basis of the digital signal processor
Debugging instruction reports the output current.
6. power management chip according to claim 4, it is characterised in that the current detection circuit includes analog digital conversion
Device and amplifying circuit, the amplifying circuit are provided with first input end, the second input and outfan, the analog-digital converter coupling
It is connected between the amplifying circuit and the digital signal processor, wherein described first input end and the second input coupling
Be connected to the two ends with the current sample element of power supply output pin coupling, the amplifying circuit by the first input end and
The analog-digital converter is arrived in output after voltage difference between second input is amplified, and the analog-digital converter will be described
The analogue signal of amplifying circuit output is converted to digital signal, and output is carried out at signal in the digital signal processor
Reason.
7. power management chip according to claim 6, it is characterised in that the amplifying circuit include amplifier, first
Resistance, second resistance, 3rd resistor and the 4th resistance；Wherein, the first resistor is coupled to the first input end and described
Between the inverting input of amplifier；The second resistance is coupled to the homophase input of second input and the amplifier
Between end；Described 3rd resistor one end is coupled between the inverting input of the first resistor and the amplifier, and described
The three resistance other ends are coupled to the outfan of the amplifier；Described 4th resistance one end is coupled to the second resistance and described
Between the in-phase input end of amplifier, the 4th resistance other end ground connection.
8. power management chip according to claim 6, it is characterised in that the power supply output pin is DC-DC
Power supply output pin, the current sample element are arranged at the outside of the power management chip, and with the DC-DC
The filter circuit coupled by power supply output pin is coupled, the power management chip be provided with respectively with the amplifying circuit
First input end and the coupling of the second input the first current detecting pin and the second current detecting pin, and then by described
First current detecting pin and the second current detecting pin couple the two ends of the current sample element.
9. power management chip according to claim 6, it is characterised in that the power supply output pin is low voltage difference power supply
Output pin, the power management chip are further integrated with current sample element, the current sample element and the low pressure
The output pin coupling of difference power supply, the first input end of the amplifying circuit and second input are respectively coupled to the electric current
The two ends of sampling element.
10. a kind of mobile device, it is characterised in that including the power management chip described in any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610820648.2A CN106526504A (en) | 2016-09-13 | 2016-09-13 | Power supply management chip and mobile device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610820648.2A CN106526504A (en) | 2016-09-13 | 2016-09-13 | Power supply management chip and mobile device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106526504A true CN106526504A (en) | 2017-03-22 |
Family
ID=58344213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610820648.2A Pending CN106526504A (en) | 2016-09-13 | 2016-09-13 | Power supply management chip and mobile device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106526504A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107016967A (en) * | 2017-06-09 | 2017-08-04 | 河源中光电通讯技术有限公司 | Backlight drive circuit |
| CN111913552A (en) * | 2019-05-10 | 2020-11-10 | 恩智浦有限公司 | Power management for data storage devices |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1548977A (en) * | 2003-05-07 | 2004-11-24 | 明基电通股份有限公司 | Power source characteristic testing insrument |
| CN201138356Y (en) * | 2007-11-23 | 2008-10-22 | 佛山市顺德区顺达电脑厂有限公司 | Current measurement circuit |
| CN101776707A (en) * | 2009-01-13 | 2010-07-14 | 鸿富锦精密工业（深圳）有限公司 | Current detection device |
| CN102129045A (en) * | 2010-01-16 | 2011-07-20 | 鸿富锦精密工业（深圳）有限公司 | Device for measuring current of power supply unit (PSU) |
| CN103888114A (en) * | 2014-04-03 | 2014-06-25 | 无锡中星微电子有限公司 | Power management chip with test mode |
| CN104682692A (en) * | 2013-11-29 | 2015-06-03 | 技嘉科技股份有限公司 | Power management unit |
| CN105223412A (en) * | 2014-05-30 | 2016-01-06 | 展讯通信（上海）有限公司 | A kind of current detection circuit and power management chip |
| CN105334470A (en) * | 2014-05-30 | 2016-02-17 | 展讯通信（上海）有限公司 | Power testing circuit based on LDO (Low Dropout Regulator) module and power management chip |
-
2016
- 2016-09-13 CN CN201610820648.2A patent/CN106526504A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1548977A (en) * | 2003-05-07 | 2004-11-24 | 明基电通股份有限公司 | Power source characteristic testing insrument |
| CN201138356Y (en) * | 2007-11-23 | 2008-10-22 | 佛山市顺德区顺达电脑厂有限公司 | Current measurement circuit |
| CN101776707A (en) * | 2009-01-13 | 2010-07-14 | 鸿富锦精密工业（深圳）有限公司 | Current detection device |
| CN102129045A (en) * | 2010-01-16 | 2011-07-20 | 鸿富锦精密工业（深圳）有限公司 | Device for measuring current of power supply unit (PSU) |
| CN104682692A (en) * | 2013-11-29 | 2015-06-03 | 技嘉科技股份有限公司 | Power management unit |
| CN103888114A (en) * | 2014-04-03 | 2014-06-25 | 无锡中星微电子有限公司 | Power management chip with test mode |
| CN105223412A (en) * | 2014-05-30 | 2016-01-06 | 展讯通信（上海）有限公司 | A kind of current detection circuit and power management chip |
| CN105334470A (en) * | 2014-05-30 | 2016-02-17 | 展讯通信（上海）有限公司 | Power testing circuit based on LDO (Low Dropout Regulator) module and power management chip |
Non-Patent Citations (1)
| Title |
|---|
| 成立 等: "《模拟电子技术基础》", 31 January 2015, 东南大学出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107016967A (en) * | 2017-06-09 | 2017-08-04 | 河源中光电通讯技术有限公司 | Backlight drive circuit |
| CN107016967B (en) * | 2017-06-09 | 2019-02-26 | 河源华盈科技有限公司 | Backlight drive circuit |
| CN111913552A (en) * | 2019-05-10 | 2020-11-10 | 恩智浦有限公司 | Power management for data storage devices |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103777067B (en) | Chip power-consumption measuring circuit, chip and chip power-consumption measuring method | |
| CN203849322U (en) | Low voltage power supply surge protector resistive current monitoring device | |
| CN207742258U (en) | A kind of loop resistance detection device for high-voltage circuitbreaker | |
| CN108037449A (en) | A kind of high-voltage circuitbreaker automatic checkout system | |
| CN101216515A (en) | Powerline pole tower ground resistance measurement method and its tester | |
| CN104330681B (en) | Dc bus scurries into the detection means of exchange in a kind of DC power system | |
| CN106645927A (en) | Power detection circuit for switching power supply | |
| CN104793100A (en) | Detection device for circuit breakage and short circuit of secondary coil of electric leakage mutual inductor | |
| CN105572453A (en) | Voltage acquisition electronic sensor apparatus | |
| CN106526504A (en) | Power supply management chip and mobile device | |
| CN204064495U (en) | A kind of temperature of oil in transformer pick-up unit | |
| CN108594140A (en) | Electronic circuit measurement of power loss device | |
| CN105738687A (en) | Portable special ground-potential live-line load current detection apparatus | |
| CN208459476U (en) | Current in resistance property detection device and arrester checks system | |
| CN104330762B (en) | Line fault detection circuit for current transformer | |
| CN207336632U (en) | A kind of radio-frequency power supply power-sensing circuit | |
| CN204008832U (en) | A kind of sampling A/D chip and the sample circuit of built-in AD to same passage of measuring | |
| CN206892242U (en) | A kind of automative wiring failure detector | |
| CN215375643U (en) | Arc detection sensor and arc detection circuit | |
| CN104459295A (en) | Sampling circuit module with hardware self-detection function | |
| CN107247174A (en) | Monitor the circuit of sewage disposal device multichannel operating mode electric current | |
| CN103728527A (en) | System for monitoring fault of loop on multi-bus section of direct current system | |
| CN107271763A (en) | Current sampling circuit, electronic trip unit, breaker | |
| CN107192896A (en) | Measurement apparatus for High voltage power frequence electric field | |
| CN103293386B (en) | A kind of proving installation of insulation resistance and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170322 |