CN109581031B - A kind of multi-functional multi gear position current detection circuit and method - Google Patents
A kind of multi-functional multi gear position current detection circuit and method Download PDFInfo
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- CN109581031B CN109581031B CN201811536184.8A CN201811536184A CN109581031B CN 109581031 B CN109581031 B CN 109581031B CN 201811536184 A CN201811536184 A CN 201811536184A CN 109581031 B CN109581031 B CN 109581031B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
Abstract
The invention discloses a kind of multi-functional multi gear position current detection circuit and methods, gating circuit includes multiple sub-circuits, the input terminal of each sub-circuit inputs a reference voltage, each sub-circuit is equipped with a gated clock, gated clock controls the on state of the sub-circuit by controlling the on state of field-effect tube in the sub-circuit, and then controls the reference voltage of gating circuit exported.Gating circuit is by reference voltage output into comparator, and another input terminal input detection voltage of comparator, comparator contrasting detection voltage and reference voltage obtain testing result, and will test result and export to latches.The advantage is that: realizing multi-functional multi gear position by a comparator and the regulatable current detection circuit of detection cycle and method, the multiplexing of comparator reduce the power consumption and area of circuit, there is low-power consumption, circuit area is small, the regulatable advantage of detection cycle.
Description
Technical field
The present invention relates to semiconductor integrated circuit, and in particular to a kind of multi-functional multi gear position current detection circuit and method.
Background technique
Since the discharge current of battery is larger, different loads discharge current is different.In order to detect battery discharge current, need
Multi-functional multi gear position, to carry out more detailed status real time monitor to it.Influence journey of the overcurrent and short circuit of circuit to circuit
Degree is different, and short circuit influence caused by circuit is greater and faster；Bigger overcurrent will also cause circuit bigger
Injury.Therefore, detection gear more refines, and more will appreciate that the real-time current range of circuit, does corresponding safeguard measure to circuit.
Further, since different stalls are different to circuit effect, in order to more quickly detect high current overcurrent, detection cycle is also deposited
It should be shorter than low current gear in the current detecting period of difference, high current gear.
Traditional detection method is using the detection week for controlling gear to different size of capacitor charging or by counter
Phase, this method not only increases circuit area, and each detection circuit can only carry out the detection of a gear, so that different
The multi-functional circuit in multi gear position in period detect it is cumbersome and waste of resource, according to increasing for gear and function, it will at double
Increase detection resource, consumes more power consumptions and circuit area.
Summary of the invention
In order to solve the above-mentioned problems of the prior art, it is an object of that present invention to provide a kind of multi-functional multi gear position electric currents
Detection circuit and method.The present invention has low-power consumption, and circuit area is small, the regulatable advantage of detection cycle.
A kind of multi-functional multi gear position current detection circuit of the present invention, including gating circuit, comparator and latch；
The gating circuit is equipped with several input terminals for being used for input reference voltage, and the output end of the gating circuit connects ratio
Compared with the first input end of device；The gating circuit is equipped with several gated clocks for being used to select reference voltage, the choosing
Logical clock and reference voltage correspond；Second input terminal of the comparator is for inputting detection voltage；The comparison
The output end of device is separately connected the input terminal of several latch, and the setting quantity of the latch is greater than or equal to gating electricity
The setting quantity of the input terminal on road, each latch are equipped with the control clock for controlling its starting.
Preferably, the gating circuit includes several and the sub-circuit that connects；The sub-circuit includes N-type field-effect
Pipe, p-type field-effect tube and phase inverter, the N-type field-effect tube and p-type field-effect tube simultaneously connect, in the N-type field-effect tube
Drain electrode and p-type field-effect tube source electrode between input reference voltage, the grid of the described gated clock connection N-type field-effect tube
Pole, the gated clock connect the grid of p-type field-effect tube by phase inverter, and the output end of multiple sub-circuits simultaneously connects
The first input end of comparator is connected afterwards.
Preferably, the comparator that the comparator is connected with for controlling comparator starting detects clock.
It preferably, further include detection resistance, the detection resistance is grounded after concatenating with slowdown monitoring circuit to be checked, the comparison
Second input terminal of device accesses between slowdown monitoring circuit to be checked and detection resistance.
A kind of multi-functional multi gear position electric current detecting method, comprising the following steps:
Several reference voltages are inputted in the input terminal of gating circuit, are selected by gated clock one of with reference to electricity
Pressure；Detection voltage is inputted in comparator, comparator compares selected reference voltage and detection voltage obtains testing result, and will
Testing result is output in latch；Control clock controlled latch latches testing result.
Preferably, the gating circuit includes several and the sub-circuit that connects；The sub-circuit includes N-type field-effect
Pipe, p-type field-effect tube and phase inverter, the N-type field-effect tube and p-type field-effect tube simultaneously connect, in the N-type field-effect tube
Drain electrode and p-type field-effect tube source electrode between input reference voltage, the grid of the described gated clock connection N-type field-effect tube
Pole, the gated clock connect the grid of p-type field-effect tube by phase inverter, and the output end of multiple sub-circuits simultaneously connects
The first input end of comparator, the grid that the gated clock passes through regulation N-type field-effect tube and p-type field-effect tube are connected afterwards
Voltage controls sub-circuit conducting, and then the reference voltage output for inputting gating circuit by the sub-circuit is to the of comparator
One input terminal.
Preferably, when comparator detection clock is in high level, comparator is in running order.
A kind of multi-functional multi gear position current detection circuit of the present invention and method, the advantage is that, gating circuit packet
Containing multiple sub-circuits, the input terminal of each sub-circuit inputs a reference voltage, when each sub-circuit is equipped with a gating
Clock, gated clock controls the on state of the sub-circuit by controlling the on state of field-effect tube in the sub-circuit, and then controls
The reference voltage of gating circuit processed exported.Gating circuit by reference voltage output into comparator, comparator it is another defeated
Enter end input detection voltage, comparator contrasting detection voltage and reference voltage obtain testing result, and will test result export to
Latches.By above structure, make that the present invention realizes multi-functional multi gear position by a comparator and detection cycle can
The current detection circuit and method of regulation, the multiplexing of comparator reduce the power consumption and area of circuit.The method of gating circuit is grasped
Make simple, Yi Shixian and gating precision height.The inspection to different stalls can be adjusted by the way that the period multiple of gated clock is arranged
The period is surveyed, the present invention is made to have the characteristics that detection cycle is regulatable.Comparator detection clock can be closed when comparator does not work
Comparator is closed, the power consumption of this circuit is further decreased.To sum up, the present invention has low-power consumption, and circuit area is small, and detection cycle is adjustable
The advantages of control.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of multi-functional multi gear position current detection circuit of the present invention；
Fig. 2 is a kind of structural schematic diagram of the gating circuit of multi-functional multi gear position current detection circuit of the present invention；
Fig. 3 is a kind of structural schematic diagram of the comparator circuit of multi-functional multi gear position current detection circuit of the present invention；
Fig. 4 is a kind of gating clock period figure of multi-functional multi gear position current detection circuit embodiment 1 of the present invention；
Fig. 5 is a kind of gating clock period figure of multi-functional multi gear position current detection circuit embodiment 2 of the present invention.
Description of symbols: 1- gating circuit, 2- comparator, 3- latch, the first latch of 31-, 32- second are latched
Device, 33- third latch, the first gated clock of clk1-, the second gated clock of clk2-, clk3- third gated clock, clk4-
Comparator detects clock, and clk5- first controls clock, and clk6- second controls clock, and clk7- third controls clock, NM1- first
N-type field-effect tube, NM2- the second N-type field-effect tube, NM3- third N-type field-effect tube, PM1- the first p-type field-effect tube, PM2-
Second p-type field-effect tube, PM3- third p-type field-effect tube, the first phase inverter of U1-, the second phase inverter of U2-, U3- third reverse phase
Device, Rcs- detection resistance.
Specific embodiment
Fig. 1 is multi-functional multi gear position current detection circuit proposed by the present invention.Circuit is by detection resistance Rcs, gating circuit
1, comparator 2 and latch 3 form.
Including gating circuit 1, comparator 2 and latch 3；The gating circuit 1 is equipped with several for inputting reference
The input terminal of voltage, the first input end of the output end connection comparator 2 of the gating circuit 1；The gating circuit 1 is set
There are several for selecting the gated clock of reference voltage V1, the gated clock and reference voltage correspond；Described
Second input terminal of comparator 2 is for inputting detection voltage；The output end of the comparator 2 is separately connected several latch
3 input terminal, the setting quantity of the latch 3 are greater than or equal to the setting quantity of the input terminal of gating circuit 1, Mei Gesuo
The latch 3 stated is equipped with the control clock for controlling its starting.Detection resistance Rcs is series at a termination in slowdown monitoring circuit to be checked
Ground, the circuital current that will test are converted to detection voltage and are input in comparator 2.Generally taking detection resistance size is 5m Ω,
Detection resistance size can make the appropriate adjustments according to detection size of current to facilitate voltage to compare.
In the present embodiment, gating circuit 1 can input three current detecting gear reference voltages: the first reference voltage V11 is
1 reference voltage of overcurrent gear, the second reference voltage V12 are 2 reference voltage of overcurrent gear, and third reference voltage V13 is short circuit inspection
Reference voltage is surveyed, the first gated clock clk1, the second gated clock clk2 and third gated clock clk3 is respectively corresponded.Pass through choosing
Logical clock controls reference voltage gating respectively, one and only one each reference voltage is strobed.Wherein overcurrent gear 1 detects electricity
Stream is less than overcurrent gear 2 and detects electric current, and overcurrent gear 2 detects electric current and is less than short-circuit detecting electric current.Pass through the use of gating circuit
Thus the conducting that each detection gear reference voltage of three kinds of detection functions of continuous control can be achieved can be realized only through a comparison
Device completes the current detecting of multi-functional different stalls.In addition to this it is possible to pass through the influence of detection function and gear to circuit
Degree sets the period of gated clock, and different stalls set different detection cycles to meet the need to circuit difference current detecting
It wants, gear detection electric current is bigger, and detection cycle is shorter.When the starting of a certain gated clock, gating circuit 1 exports the corresponding choosing
Reference voltage corresponding to logical clock is into comparator 2.
Comparator 2 receives detection voltage V2 and reference voltage V1 and is compared and obtains testing result, and comparator 2 should ensure that
It works in institute's functional gear detection, clock clk4 can be detected by comparator and controls the switch of comparator 2, the pass when not working
Comparator 2 is closed, realizes minimumization of power consumption.Comparator 2 will test result and export into latch 3.
Latch the testing result of overcurrent gear 1, overcurrent gear 2 and short-circuit gear respectively using 3 latch 3, it is corresponding
Controlling clock is respectively clk5, clk6, clk7.To guarantee that each function gear testing result is latched output, each output
Testing result corresponds to a Function detection, and wherein clk5 latches 1 testing result of overcurrent gear, and clk6 latches overcurrent gear 2 and detects
As a result, clk7 latches short-circuit detecting result.
After the detection of all gears, when detected circuit electric current is not above 1 electric current of overcurrent gear, testing result 1,2,3
Effective by high level, output result is 000；When detected circuit electric current is more than 1 electric current of overcurrent gear not above 2 electricity of overcurrent gear
Stream, output result are 100；When detected circuit electric current is more than 2 electric current of overcurrent gear not above short circuit current, exporting result is
110；When the super short circuit current of detected circuit electric current, exporting result is 111.As shown in table 1.
The detection output result of table 1
| Detect electric current | Detection output (overcurrent 1, overcurrent 2, short circuit) |
| Detect electric current < overcurrent gear 1 | 000 |
| Overcurrent 1 < detection electric current < overcurrent 2 | 100 |
| Overcurrent 2 < detection electric current < short circuit | 110 |
| Detect electric current > short circuit gear | 111 |
Gating circuit as shown in Fig. 2, single sub-circuit by a N-type field-effect tube, a p-type field-effect tube and one it is anti-
Phase device composition；According to the function gear of setting, three sub-circuit composition gating circuits are shared.First N-type field-effect tube NM1 and
One p-type field-effect tube PM1 simultaneously connects, the drain electrode of the source electrode connection p-type field-effect tube of N-type field-effect tube, the drain electrode of N-type field-effect tube
Connect the source electrode of p-type field-effect tube.The first N-type field-effect tube NM1 drain electrode and the first p-type field-effect tube PM1 source electrode it
Between input reference voltage V1, the grid of first gated clock clk1 connection the first N-type field-effect tube NM1, the first gated clock
Clk1 passes through the grid of first phase inverter U1 connection the first p-type field-effect tube PM1, and the output end of sub-circuit described in three simultaneously connects
The first input end of comparator 2 is connected afterwards.Connection relationship and NM1, PM1, U1 between NM2, PM2, U2 and NM3, PM3, U3 connect
It is identical to connect relationship.
When clk1 is high level, NM1, PM1 conducting, remaining metal-oxide-semiconductor are closed, and output reference voltage is equal to overcurrent gear 1
Reference voltage.Overcurrent gear 2 and the reference voltage of short-circuit detecting gating principle are identical as overcurrent gear 1.Using CMOS gating
High-precision voltage gating may be implemented in method.
Comparator circuit is as shown in Figure 3.It is inputted using p pipe, realizes the detection comparing function of low input.Wherein PM1,
NM2, PM3, NM8 are the switch of comparator.When enable signal en is high level, PM1 pipe is opened, NM2, PM3, and NM8 is closed, than
It is worked normally compared with device；When en is low level, PM1 shutdown, NM2, PM3, NM8 opening, comparator is without bias current, comparator output
Be forced to draw is low level.Comparator is only opened when needed, it can be achieved that the low-power consumption of system works.
Embodiment 1
The present embodiment is the identical application example of gated clock, as shown in figure 4, clk1, clk2, clk3 are gating circuit
3 groups of gated clocks, 3 clock cycle are identical.1 reference voltage of overcurrent gear of gated current detection, mistake are distinguished in high level
2 reference voltage of gear and short-circuit detecting reference voltage are flowed, and an only gear conducting every time.When clk4 is that comparator detects
Clock, comparator work in clk4 clock high level, therefore clk4 high level includes clk1, the height of all clocks of clk2, clk3
Level.Because clk1, clk2, clk3 clock are respectively turned on different stalls, therefore comparator does the inspection of overcurrent gear 1 respectively in order
It surveys, the detection of overcurrent gear 2 and short-circuit detecting compare.Clk5, clk6, clk7 respectively latch gear testing result, pulse
Width is the half of gated clock, to stop the comparison time of comparator.
Embodiment 2
The present embodiment is the different application example of gating clock period.
As shown in figure 5, the gated clock of clk1, clk2, clk3 as gear, when can also regard the detection of respective notch as
Clock.
Clk3 is short-circuit detecting clock, enables its detection cycle most short, is set as Tclk3；
Clk2 is that overcurrent gear 2 detects clock, and the period is set as m times: Tclk2=Tclk3*m of clk3；
Clk1 is that overcurrent gear 1 detects clock, and the period is set as n times of clk2, n*m times: Tclk1=Tclk3*n* of clk3
m；
Clk4 is that comparator detects clock, and the period is identical as clk3: Tclk4=Tclk3.
But since a detection gear can only be connected in the same time.Therefore when gear occur and simultaneously turning on, priority
Gated clock is generated by clk1 > clk2 > clk3, i.e., overcurrent gear 2 and short-circuit detecting cannot be connected when being connected by overcurrent gear 1；
Short-circuit detecting cannot be connected in overcurrent gear 2 principle of temporal sequence when being connected generates gated clock.Clk4 is comparator work clock, must
Detection every time must be kept to be both turned on.
Therefore, by the above setting, after detecting an overcurrent gear 1, it will test n-1 overcurrent gear 2；Detect an overcurrent
After gear 2, m-1 short-circuit detecting will test.It circuits sequentially, realizes the detection method of different detection gear different cycles.Period
Multiple can be adjusted according to practical situations.
The current detection function that circuit crosses the multi-functional multi gear position of flow short-circuit to sum up is realized only with a comparator, is had
There is low-power consumption, circuit area is small, the regulatable advantage of detection cycle.
For those skilled in the art, it can make other each according to the above description of the technical scheme and ideas
The corresponding change of kind and deformation, and all these changes and deformation all should belong to the protection model of the claims in the present invention
Within enclosing.
Claims (7)
1. a kind of multi-functional multi gear position current detection circuit, which is characterized in that including gating circuit (1), comparator (2) and latch
Device (3)；The gating circuit (1) is equipped with several input terminals for being used for input reference voltage, the gating circuit (1)
Output end connects the first input end of comparator (2)；The gating circuit (1) is equipped with several for selecting reference voltage
Gated clock, the gated clock and reference voltage correspond；Second input terminal of the comparator (2) is for inputting
Detect voltage；The output end of the comparator (2) is separately connected the input terminal of several latch (3), the latch
(3) setting quantity is greater than or equal to the setting quantity of the input terminal of gating circuit (1), and each latch (3) is all provided with
There is the control clock for controlling its starting.
2. a kind of multi-functional multi gear position current detection circuit according to claim 1, which is characterized in that the gating circuit
(1) sub-circuit for including several and connecing；The sub-circuit includes N-type field-effect tube, p-type field-effect tube and phase inverter, institute
The N-type field-effect tube and p-type field-effect tube stated simultaneously connect, in the drain electrode of the N-type field-effect tube and the source electrode of p-type field-effect tube
Between input reference voltage, the grid of the described gated clock connection N-type field-effect tube, the gated clock passes through phase inverter
Connect the grid of p-type field-effect tube, the output end of multiple sub-circuits and the first input that comparator (2) are connected after connecing
End.
3. a kind of multi-functional multi gear position current detection circuit according to claim 1, which is characterized in that the comparator
(2) it is connected with the comparator for controlling comparator (2) starting and detects clock.
4. a kind of multi-functional multi gear position current detection circuit according to claim 1, which is characterized in that further include detection electricity
Resistance, the detection resistance are grounded after concatenating with slowdown monitoring circuit to be checked, and the second input terminal of the comparator (2) is accessed to be checked
Between slowdown monitoring circuit and detection resistance.
5. a kind of detection method using any multi-functional multi gear position current detection circuit of Claims 1-4, feature exist
In, comprising the following steps:
Several reference voltages are inputted in the input terminal of gating circuit (1), one of reference voltage is selected by gated clock
And the reference voltage is input to the first input end of comparator (2)；In the second input terminal input detection electricity of comparator (2)
Pressure, comparator (2) compares selected reference voltage and detection voltage obtains testing result, and will test result and be output to latch
In device (3)；Testing result is latched in control clock controlled latch (3).
6. detection method according to claim 5, which is characterized in that the gating circuit (1) includes several and connects
Sub-circuit；The sub-circuit includes N-type field-effect tube, p-type field-effect tube and phase inverter, the N-type field-effect tube and P
Type field-effect tube simultaneously connects, the input reference voltage between the drain electrode of the N-type field-effect tube and the source electrode of p-type field-effect tube,
The grid of the gated clock connection N-type field-effect tube, the gated clock connect p-type field-effect tube by phase inverter
Grid, the output end of multiple sub-circuits and the first input end that comparator (2) are connected after connecing, the gated clock are logical
The grid voltage for crossing regulation N-type field-effect tube and p-type field-effect tube controls sub-circuit conducting, and then makes gating circuit (1) will
The reference voltage output that the sub-circuit is inputted to comparator (2) first input end.
7. detection method according to claim 5, which is characterized in that when comparator detection clock is in high level, than
It is in running order compared with device (2).
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| CN201811536184.8A CN109581031B (en) | 2018-12-14 | 2018-12-14 | A kind of multi-functional multi gear position current detection circuit and method |
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| CN110702968B (en) * | 2019-11-15 | 2022-07-19 | 新疆东方希望新能源有限公司 | Grounding current grading detection method for power supply system of polycrystalline silicon reduction furnace |
| CN112763094B (en) * | 2020-12-21 | 2022-11-15 | 广东省科学院测试分析研究所(中国广州分析测试中心) | Automatic dual-mode switching temperature detection system and method |
| CN117250566A (en) * | 2023-09-18 | 2023-12-19 | 珠海智融科技股份有限公司 | Type-C connection detection circuit and electronic equipment |
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