CN106646077A - Detection apparatus used for detecting open and short circuit of load - Google Patents
Detection apparatus used for detecting open and short circuit of load Download PDFInfo
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- CN106646077A CN106646077A CN201611026071.4A CN201611026071A CN106646077A CN 106646077 A CN106646077 A CN 106646077A CN 201611026071 A CN201611026071 A CN 201611026071A CN 106646077 A CN106646077 A CN 106646077A
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- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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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
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
An embodiment of the invention discloses a detection apparatus used for detecting open and short circuits of a load. The detection apparatus comprises a voltage source, a detection circuit, a micro-control unit MCU and the load. The detection circuit comprises a detection resistor and a comparison circuit. An anode of the voltage source is connected to one end of the detection resistor, the other end of the detection resistor is connected to an input terminal of the comparison circuit and one end of the load, and the other end of the load is grounded. An output terminal of the comparison circuit is connected to an input terminal of the MCU. A control terminal of the MCU is connected to an enabled terminal of the voltage source. The embodiment of the invention, the MCU does not need to detect a state of the load in real time; floating point operation does not need to be performed for a long time; according to a short circuit signal or an open circuit signal output by the comparison circuit, whether the load is in a short circuit state or an open circuit state can be determined; and whether the load is in the short circuit state or the open circuit state can be determined rapidly, a workload of the MCU is mitigated, power consumption of the MCU is reduced and then power consumption for the detection apparatus to detect the open and short circuits of the load is decreased.
Description
Technical field
The present invention relates to electronic circuit technology field, and in particular to the detection means of short circuit is opened in a kind of detection load.
Background technology
In electronic system design with application, power end and load end are often all the independent division of labor, do not have it is related, in order to
The paralysis of whole electronic system, power end is avoided to generally require detection load condition, so as to find bad phenomenon (example in time
Such as, load open circuit and short circuit) and processed.
Existing load monitoring technology is typically added using instrument amplifier and detected by the way of analog-digital converter.Examine first
Measuring resistance detects load current and is converted to weak voltage signal, and then instrument amplifier is processed and defeated this weak voltage signal
Go out that amplitude is moderate, low output impedance voltage signal；Then the voltage signal is converted to data signal in by analog-digital converter
Central processor is processed, and central processing unit receives the data signal, according to the reference voltage and number of bits of analog-digital converter
The magnitude of voltage of instrument amplifier output is calculated, then detection resistance is calculated according to the gain factor of the magnitude of voltage and instrument amplifier
On pressure drop, further obtain load current, and then calculate the size of load.
Central processing unit needs the data of Real-time Collection analog-digital converter, carries out a series of floating-point operation, causes central authorities
The work load of process is heavier, because the demand of monitor in real time, central processing unit needs processing data always, instrument amplifier and
Analog-digital converter needs long-term work, produces higher power consumption.
The content of the invention
The embodiment of the present invention provides the detection means that short circuit is opened in a kind of detection load, can reduce detection means detection load
Open the power consumption of short circuit.
Embodiment of the present invention first aspect, there is provided the detection means of short circuit, including voltage source, inspection are opened in a kind of detection load
Slowdown monitoring circuit, micro-control unit MCU and load, wherein：
The detection circuit includes detection resistance and comparison circuit；
The positive pole of the voltage source connects one end of the detection resistance, and the other end of the detection resistance connects the ratio
Input and one end of the load compared with circuit, the other end ground connection of the load；
The output end of the comparison circuit connects the input of the MCU, and the control end of the MCU connects the voltage source
Enable Pin；
The comparison circuit obtains the magnitude of voltage of the detection resistance detection, and according to the magnitude of voltage load is determined
Load condition, the load condition includes the one kind in open-circuit condition, short-circuit condition and normal condition；When the load is described
During open-circuit condition, the comparison circuit output open circuit signal to the MCU, the MCU is generated according to the open circuit signaling and opened a way
Information；When the load is the short-circuit condition, the comparison circuit output short-circuit signal to the MCU, the MCU
The voltage source is outputed enable signal to according to the short-circuit signal, is closed with controlling the voltage source.
There is provided in the embodiment of the present invention it is a kind of can quickly low-power consumption judge load whether open short circuit detection means, MCU
Can determine that load is to be in short-circuit condition or open-circuit condition according to the short-circuit signal of comparison circuit output or open circuit signaling,
Information is sent when load is in abnormal state (short-circuit condition or open-circuit condition) and reminds user, and be in load
Voltage source is outputed enable signal to during short-circuit condition, is closed in time with control voltage source, can in time protect source end system.This
MCU in bright embodiment need not in real time detect the state of load, without the need for carrying out floating-point operation for a long time, only need to be according to comparison circuit
The short-circuit signal or open circuit signaling of output can determine that load is to be in short-circuit condition or open-circuit condition, can be with quick detection
Whether load opens short circuit, mitigates the work load of MCU, reduces the power consumption of MCU, and then reduce detection means detection load to open short circuit
Power consumption.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the detection means that short circuit is opened in a kind of detection load disclosed in the embodiment of the present invention；
Fig. 2 is the structural representation of the detection means that short circuit is opened in another kind of detection load disclosed in the embodiment of the present invention；
Fig. 3 is the structural representation of the detection means that short circuit is opened in another kind of detection load disclosed in the embodiment of the present invention；
Fig. 4 is a kind of structural representation of open circuit comparison circuit disclosed in the embodiment of the present invention；
Fig. 5 is a kind of structural representation of short-circuit comparison circuit disclosed in the embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in embodiment of the present invention, the technical scheme in embodiment of the present invention is carried out clearly
Chu, it is fully described by.Obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiment party
Formula.Based on the embodiment in the present invention, those of ordinary skill in the art are obtained on the premise of creative work is not made
The every other embodiment for obtaining, should all belong to the scope of protection of the invention.
The embodiment of the present invention provides the detection means that short circuit is opened in a kind of detection load, can reduce detection means detection load
Open the power consumption of short circuit.It is described in detail individually below.
Fig. 1 is referred to, Fig. 1 is that the structure of the detection means that short circuit is opened in a kind of detection load disclosed in the embodiment of the present invention is shown
It is intended to.As shown in figure 1, the detection means of short circuit, including voltage source 101, detection are opened in the detection load described in the present embodiment
Circuit 102, micro-control unit MCU103 and load 104, wherein：
Detection circuit 102 includes detection resistance 1021 and comparison circuit 1022；
One end of the positive pole connecting detection resistance 1021 of voltage source 101, the other end connection of detection resistance 1021 is more electric
The input on road 1022 and one end of load 104, load 104 other end ground connection；
The output end of comparison circuit 1022 connects the input of MCU103, the control end connection voltage source 101 of MCU103
Enable Pin；
Comparison circuit 1022 obtains the magnitude of voltage of the detection of detection resistance 1021, and according to magnitude of voltage the load of load 104 is determined
State, load condition includes the one kind in open-circuit condition, short-circuit condition and normal condition；When it is open-circuit condition to load 104, than
Compared with the output open circuit signal of circuit 1022 to MCU103, MCU103 generates open circuit information according to open circuit signaling；When load 104 is
During short-circuit condition, to MCU103, MCU103 is outputed enable signal to the output short-circuit signal of comparison circuit 1022 according to short-circuit signal
Voltage source 101, is closed with control voltage source 101, and MCU103 can be with output short-circuit information.
In the embodiment of the present invention, voltage source 101 can be any type of power supply unit, it is preferred that voltage source 101 is straight
Stream voltage source, can export d. c. voltage signal.Detection circuit 102 is used to connect voltage source 101 and load 104, detects circuit
102 load conditions for being used for detection load 104, when it is open-circuit condition or short-circuit condition to detect the detection of circuit 102 load 104,
Interrupt MCU103, MCU103 is that open-circuit condition or short-circuit condition perform different operations according to load 104.Loading 104 can be
Capacitive reactances, emotional resistance, can also be pure resistance.
Detection resistance 1021 in the embodiment of the present invention is connected with load 104, and comparison circuit 1022 can detect load 104
The voltage at two ends.For example, if the supply voltage of voltage source 101 is 3.3V, detection resistance is 30 Ω, and load impedance is 300
Ω, then under normal condition, it is 3V that comparison circuit 1022 detects the voltage at 104 two ends of load, if load 104 is opened a way completely,
The voltage that then comparison circuit 1022 detects 104 two ends of load is 3.3V；If 104 dead shorts of load, comparison circuit
1022 voltages for detecting 104 two ends of load are 0V.
Because the result of the detection of comparison circuit 1022 is it is possible that certain deviation, in order to ensure the accurate of testing result
Fixed, comparison circuit 1022 can arrange interval open-circuit voltage, short-circuit voltage interval and normal voltage interval, for example, can arrange
It is 0-2.8V for 3.25-3V, short-circuit voltage interval that open-circuit voltage is interval and normal voltage interval is 2.8-3.25V.When relatively more electric
When road 1022 detects the voltage at 104 two ends of load less than 2.8V, then judge that load 104 is short-circuit；When comparison circuit 1022 is detected
When being more than 3.25V to the voltage for loading 104 two ends, then judge that load 104 is opened a way；When comparison circuit 1022 detects load 104
When the voltage at two ends is located between 2.8-3.25V, then judge that load 104 is in normal condition.
When comparison circuit 1022 judges 104 short-circuit, the output short-circuit signals of comparison circuit 1022 to MCU103 of load；When comparing
Circuit 1022 judges that load 104 is opened a way, the output open circuit signal of comparison circuit 1022 to MCU103.When MCU103 receives short-circuit letter
Number when, MCU103 outputs enable signal to voltage source 101 according to short-circuit signal, is closed with control voltage source 101；When MCU103 connects
When receiving open circuit signaling, MCU103 generates open circuit information according to open circuit signaling, to point out user load 104 to open a way.
Implement the embodiment of the present invention, MCU need not in real time detect the state of load, without the need for carrying out floating-point operation for a long time, only
Need to can determine that load is in short-circuit condition or open circuit shape according to the short-circuit signal of comparison circuit output or open circuit signaling
Whether state, can open short circuit with quick detection load, mitigate the work load of MCU, reduce the power consumption of MCU, and then reduce detection dress
Put the power consumption that short circuit is opened in detection load.
In one embodiment, as shown in Fig. 2 Fig. 2 is that short circuit is opened in another kind of detection load disclosed in the embodiment of the present invention
Detection means structural representation.As shown in Fig. 2 the detection means of short circuit is opened in the detection load described in the present embodiment,
Including voltage source 101, detection circuit 102, micro-control unit MCU103 and load 104, wherein：
Detection circuit 102 includes detection resistance 1021 and comparison circuit 1022；
One end of the positive pole connecting detection resistance 1021 of voltage source 101, the other end connection of detection resistance 1021 is more electric
The input on road 1022 and one end of load 104, load 104 other end ground connection；
The output end of comparison circuit 1022 connects the input of MCU103, the control end connection voltage source 101 of MCU103
Enable Pin；
Comparison circuit 1022 includes short-circuit comparison circuit 10221 and open circuit comparison circuit 10222, comparison circuit 1022 it is defeated
Going out end includes the output end of short-circuit comparison circuit 10221 and the output end of open circuit comparison circuit 10222, the input bag of MCU103
Include first input end and the second input, the input of short-circuit comparison circuit 10221 and the input of open circuit comparison circuit 10222
The other end of connecting detection resistance 1021, the output end connection first input end of short-circuit comparison circuit 10221, comparison circuit of opening a way
10222 output end connects the second input.
Short-circuit comparison circuit 10221 and open circuit comparison circuit 10222 all obtain 104 liang of the load of the detection of detection resistance 1021
The magnitude of voltage at end, according to load 104 two ends magnitude of voltage determine load 104 load condition, load condition include open-circuit condition,
One kind in short-circuit condition and normal condition.
For example, when short-circuit comparison circuit 10221 judges that the magnitude of voltage at 104 two ends of load is located at short-circuit voltage interval
When, the output end of short-circuit comparison circuit 10221 exports the first input end of high level signal to MCU103, when the first of MCU103
During input input high level signal, MCU103 judges that load 104 is in short-circuit condition, and outputs enable signal to voltage source
101, closed with control voltage source 101；When short-circuit comparison circuit 10221 judges that the magnitude of voltage at 104 two ends of load is not located at short circuit
During voltage range, the output end of short-circuit comparison circuit 10221 exports the first input end of low level signal to MCU103, when
During the first input end input low level signal of MCU103, MCU103 judges that load 104 is not at short-circuit condition, and MCU103 ignores
The low level signal, does not perform shut-off voltage source 101 and operates.In another embodiment, when short-circuit comparison circuit 10221 is sentenced
When the magnitude of voltage at 104 two ends of disconnected load is located at short-circuit voltage interval, the output end output low level letter of short-circuit comparison circuit 10221
Number to MCU103 first input end so that MCU103 perform shut-off voltage source 101 operation；When short-circuit comparison circuit 10221
When judging that the magnitude of voltage at 104 two ends of load is not located at short-circuit voltage interval, the high electricity of output end output of short-circuit comparison circuit 10221
The first input end of ordinary mail number to MCU103, MCU103 judges that load 104 is not at short-circuit condition, and MCU103 ignores the high level
Signal, MCU103 does not perform the operation of shut-off voltage source 101.
For example, when open circuit comparison circuit 10222 judges that the magnitude of voltage at 104 two ends of load is located at open-circuit voltage interval
When, the output end of comparison circuit 10222 of opening a way exports the second input of high level signal to MCU103, when the second of MCU103
During input input high level signal, MCU103 judges that load 104 is in open-circuit condition, and MCU103 is generated according to high level signal
Open circuit information, to point out user load 104 to open a way；When open circuit comparison circuit 10222 judges the magnitude of voltage at 104 two ends of load
Be not located at open-circuit voltage it is interval when, it is second defeated to MCU103 that the output end of comparison circuit 10222 of opening a way exports low level signal
Enter end, when the second input input low level signal of MCU103, MCU103 judges that load 104 is not at open-circuit condition,
MCU103 ignores the low level signal, and MCU103 does not perform prompting operation.In another embodiment, when open circuit comparison circuit
When the magnitude of voltage at 10222 104 two ends of judgement load is located at open-circuit voltage interval, the output end of comparison circuit 10222 of opening a way is exported
Second input of low level signal to MCU103, so that MCU103 performs prompting operation；When open circuit comparison circuit 10222 judges
When the magnitude of voltage for loading 104 two ends is not located at open-circuit voltage interval, the output end output high level letter of comparison circuit 10222 of opening a way
Number to MCU103 the second input, MCU103 judges that load 104 is not at open-circuit condition, and MCU103 ignores high level letter
Number, MCU103 does not perform prompting operation.
For example, when short-circuit comparison circuit 10221 and open circuit comparison circuit 10222 judge the voltage at 104 two ends of load
Value be located at normal voltage it is interval when, it is first defeated to MCU103 that the output end of short-circuit comparison circuit 10221 exports high level signal
Enter end, the output end of comparison circuit 10222 of opening a way exports the second input of high level signal to MCU103, when the of MCU103
When one input and the equal input high level signal of the second input, MCU103 judges that load 104 is in normal condition, and MCU103 is not
It is interrupted, does not perform and any 104 open the relevant operation of short circuit with load.In another embodiment, when short-circuit comparison circuit
When 10221 magnitudes of voltage for loading 104 two ends with the open circuit judgement of comparison circuit 10222 are located at normal voltage interval, short-circuit ratio is more electric
The output end on road 10221 exports the first input end of low level signal to MCU103, and the output end of comparison circuit 10222 of opening a way is defeated
Go out the second input of low level signal to MCU103, when the first input end and the equal input low level of the second input of MCU103
During signal, MCU103 judges that load 104 is in normal condition, and MCU103 is not disrupted, and does not perform any and load 104 and opens short circuit
Relevant operation.
Detection resistance 1021 in the embodiment of the present invention is connected with load 104, and short-circuit comparison circuit 10221 and open circuit compare
Circuit 10222 can detect the voltage at 104 two ends of load.For example, if the supply voltage of voltage source 101 is 3.3V, inspection
Measuring resistance be 30 Ω, load impedance be 300 Ω, then under normal condition, short-circuit comparison circuit 10221 and open circuit comparison circuit
10222 voltages for detecting 104 two ends of load are 3V, if load 104 is opened a way completely, short-circuit comparison circuit 10221 and are opened
It is 3.3V that road comparison circuit 10222 detects the voltage at 104 two ends of load；If 104 dead shorts of load, short-circuit ratio is more electric
It is 0V that road 10221 and open circuit comparison circuit 10222 detect the voltage at 104 two ends of load.
Because the result of the detection of comparison circuit 1022 is it is possible that certain deviation, in order to ensure the accurate of testing result
It is fixed, interval open-circuit voltage, short-circuit voltage interval and normal voltage interval can be set, for example, it is interval that open-circuit voltage can be set
It is that 0-2.8V and normal voltage are interval for 2.8-3.25V for 3.25-3V, short-circuit voltage interval.When short-circuit comparison circuit 10221 is examined
When the voltage for measuring 104 two ends of load is less than 2.8V, load 104 is in short-circuit condition, then short-circuit comparison circuit 10221 exports short
Road signal (such as high level) is to MCU103, so that MCU103 shut-off voltage sources 101；When open circuit comparison circuit 10222 is detected
When the voltage for loading 104 two ends is more than 3.25V, load 104 is in open-circuit condition, then the output open circuit of comparison circuit 10222 of opening a way
Signal (such as high level) is to MCU103, so that MCU103 performs prompting (user) operation.When short-circuit comparison circuit 10221 and opening
When road comparison circuit 10222 detects the voltage at 104 two ends of load between 2.8-3.25V, then load 104 is in normal shape
State.
In one embodiment, as shown in figure 3, Fig. 3 is that short circuit is opened in another kind of detection load disclosed in the embodiment of the present invention
Detection means structural representation.As shown in figure 3, the detection means of short circuit is opened in the detection load described in the present embodiment,
Including voltage source 101, detection circuit 102, micro-control unit MCU103 and load 104 and level shifting circuit 105, wherein：
Detection circuit 102 includes detection resistance 1021 and comparison circuit 1022；
One end of the positive pole connecting detection resistance 1021 of voltage source 101, the other end connection of detection resistance 1021 is more electric
The input on road 1022 and one end of load 104, load 104 other end ground connection；
The output end of comparison circuit 1022 connects the input of MCU103, the control end connection level shifting circuit of MCU103
105 input, the output end of level shifting circuit 105 connects the Enable Pin of voltage source；
Comparison circuit 1022 includes short-circuit comparison circuit 10221 and open circuit comparison circuit 10222, comparison circuit 1022 it is defeated
Going out end includes the output end of short-circuit comparison circuit 10221 and the output end of open circuit comparison circuit 10222, the input bag of MCU103
Include first input end and the second input, the input of short-circuit comparison circuit 10221 and the input of open circuit comparison circuit 10222
The other end of connecting detection resistance 1021, the output end connection first input end and level conversion electricity of short-circuit comparison circuit 10221
The input on road 105, the output end of comparison circuit 10222 of opening a way connects the second input.
Level shifting circuit 105 is used to for the short-circuit signal that short-circuit comparison circuit 10221 is exported to be inverted to proper states use
In control voltage source 101, because short-circuit comparison circuit 10221 is output as closed-loop control, not yet stably set up defeated in voltage source 101
Before going out, if not using level shifting circuit 105, the short-circuit signal of the short-circuit output of comparison circuit 10221 can control voltage
Source 101 is disabled state (closing output), so as to be mistaken for short-circuit condition.Prevent from being mistaken for using level shifting circuit 105
Short-circuit condition.
In one embodiment, as shown in figure 4, Fig. 4 is a kind of knot of open circuit comparison circuit disclosed in the embodiment of the present invention
Structure schematic diagram, the open circuit comparison circuit shown in Fig. 4 is applied to Fig. 2 and Fig. 3, and the open circuit comparison circuit includes first voltage comparator
U1 and the first open-drain output circuit, the other end of the in-phase input end connecting detection resistance 1021 of first voltage comparator U1, the
The inverting input connection open-circuit voltage benchmark of one voltage comparator U1, the output end connection first of first voltage comparator U1 is opened
The input of leakage output circuit, the output end of the first open-drain output circuit connects the second input.
First open-drain output circuit includes the first pull-up resistor R1 and the first pull down resistor R2, on the first pull-up resistor R1
Voltage vcc can be equal with the voltage of voltage source 101, for example, if the output voltage of voltage source 101 is 3.3V, can arrange
Voltage vcc on first pull-up resistor R1 is 3.3V.The output level of open-drain output circuit can be by the first pull-up resistor R1
Voltage vcc determining.
In one embodiment, as shown in figure 5, Fig. 5 is a kind of knot of short-circuit comparison circuit disclosed in the embodiment of the present invention
Structure schematic diagram, the short-circuit comparison circuit shown in Fig. 5 is applied to Fig. 2, Fig. 3, and the short-circuit comparison circuit includes second voltage comparator
U2, the second open-drain output circuit and delay circuit, the inverting input connecting detection resistance 1021 of second voltage comparator U2
The other end, the in-phase input end connection short-circuit voltage benchmark of second voltage comparator U2, the output end of second voltage comparator U2
Connect the input of the second open-drain output circuit, the input of the output end connection delay circuit of the second open-drain output circuit prolongs
Late the output end of circuit connects first input end.
Second open-drain output circuit includes the second pull-up resistor R3 and the second pull down resistor R4.On second pull-up resistor R3
Voltage vcc can be equal with the voltage of voltage source 101, for example, if the output voltage of voltage source 101 is 3.3V, can arrange
Voltage vcc on second pull-up resistor R3 is 3.3V.The output level of open-drain output circuit can be by the second pull-up resistor R3
Voltage vcc determining.Delay circuit can be RC parallel circuits, the delay time T=1/RC of delay circuit.
Wherein, open-circuit voltage benchmark is more than short-circuit voltage benchmark.For example, if the output voltage of voltage source 101 is 3.3V,
It is 3.25V that open-circuit voltage benchmark can be arranged, and it is 2.8V to arrange short-circuit voltage benchmark.
Wherein, in general circuit application, because the empty short and void of voltage comparator is broken, using divider resistance as opening
Road voltage reference and short-circuit voltage benchmark, you can to meet the basic use requirement of circuit.Open-circuit voltage benchmark is by the first partial pressure
Circuit is provided, and short-circuit voltage benchmark is provided by the second bleeder circuit.First bleeder circuit and the second bleeder circuit can be using electricity
Resistance and capacitance partial pressure are it is achieved that realize that difficulty is low, cost is relatively low.
Wherein, in the higher circuit application of threshold denominators stability, due to needing to improve threshold denominators stability, need
Voltage-reference is used as voltage reference.Open-circuit voltage benchmark is provided by open-circuit voltage a reference source, and short-circuit voltage benchmark is by short-circuit electricity
Pressure a reference source is provided.Voltage source reference can adopt voltage reference chip, it would however also be possible to employ the voltage base that voltage origin system is carried
Quasi- source, with cost-effective.
A kind of detection load for being provided the embodiment of the present invention above is opened the detection means of short circuit and is described in detail,
Specific case used herein is set forth to the principle and embodiment of the present invention, and the explanation of above example is simply used
Understand the method for the present invention and its core concept in help；Simultaneously for one of ordinary skill in the art, according to the present invention's
Thought, will change in specific embodiments and applications, and in sum, this specification content should not be construed as
Limitation of the present invention.
Claims (8)
1. the detection means of short circuit is opened in a kind of detection load, it is characterised in that including voltage source, detection circuit, micro-control unit
MCU and load, wherein：
The detection circuit includes detection resistance and comparison circuit；
The positive pole of the voltage source connects one end of the detection resistance, and the other end connection comparison of the detection resistance is electric
The input on road and one end of the load, the other end ground connection of the load；
The output end of the comparison circuit connects the input of the MCU, and the control end of the MCU connects making for the voltage source
Can end；
The comparison circuit obtains the magnitude of voltage of the detection resistance detection, and according to the magnitude of voltage load of the load is determined
State, the load condition includes the one kind in open-circuit condition, short-circuit condition and normal condition；When the load is the open circuit
During state, the comparison circuit output open circuit signal to the MCU, the MCU generates open circuit prompting according to the open circuit signaling
Information；When it is described load for the short-circuit condition when, the comparison circuit output short-circuit signal to the MCU, the MCU according to
The short-circuit signal outputs enable signal to the voltage source, is closed with controlling the voltage source.
2. detection means according to claim 1, it is characterised in that the comparison circuit includes short-circuit comparison circuit and opens
Road comparison circuit, the output end of the comparison circuit includes the output end and the open circuit comparison circuit of the short-circuit comparison circuit
Output end, the input of the MCU includes first input end and the second input, the input of the short-circuit comparison circuit and
The input of the open circuit comparison circuit connects the other end of the detection resistance, the output end connection of the short-circuit comparison circuit
The first input end, the output end of the open circuit comparison circuit connects second input.
3. detection means according to claim 2, it is characterised in that the detection means also includes level shifting circuit,
The input of the level shifting circuit connects the output end of the short-circuit comparison circuit and the control end of the MCU, the electricity
The output end of flat change-over circuit connects the Enable Pin of the voltage source.
4. detection means according to claim 2, it is characterised in that the open circuit comparison circuit compares including first voltage
Device and the first open-drain output circuit, the in-phase input end of the first voltage comparator connects the other end of the detection resistance,
The inverting input connection open-circuit voltage benchmark of the first voltage comparator, the output end connection of the first voltage comparator
The input of the first open-drain output circuit, the output end of the first open-drain output circuit connects second input.
5. detection means according to claim 2, it is characterised in that the short-circuit comparison circuit compares including second voltage
Device, the second open-drain output circuit and delay circuit, the inverting input of the second voltage comparator connects the detection resistance
The other end, the second voltage comparator in-phase input end connection short-circuit voltage benchmark, the second voltage comparator
Output end connects the input of the second open-drain output circuit, prolongs described in the output end connection of the second open-drain output circuit
The input of slow circuit, the output end of the delay circuit connects the first input end.
6. detection means according to claim 5, it is characterised in that the open-circuit voltage benchmark is more than the short-circuit voltage
Benchmark.
7. the detection means according to any one of claim 5-6, it is characterised in that the open-circuit voltage benchmark is by first point
Volt circuit is provided, and the short-circuit voltage benchmark is provided by the second bleeder circuit.
8. the detection means according to any one of claim 5-6, it is characterised in that the open-circuit voltage benchmark is by electricity of opening a way
Pressure a reference source is provided, and the short-circuit voltage benchmark is provided by short-circuit voltage a reference source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611026071.4A CN106646077A (en) | 2016-11-18 | 2016-11-18 | Detection apparatus used for detecting open and short circuit of load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN107516481A (en) * | 2017-08-18 | 2017-12-26 | 京东方科技集团股份有限公司 | Display module protection device and method, test board and display module |
| CN107748305A (en) * | 2017-09-26 | 2018-03-02 | 九阳股份有限公司 | A kind of water purifier fault detection method and circuit |
| CN107797047A (en) * | 2017-09-27 | 2018-03-13 | 深圳和而泰智能控制股份有限公司 | Load state detecting method, device and electronic equipment |
| CN109239514A (en) * | 2018-08-03 | 2019-01-18 | 重庆川仪自动化股份有限公司 | A kind of liquidometer short circuit sensor, open detection circuit |
| CN110568290A (en) * | 2019-09-18 | 2019-12-13 | 山东省计算中心（国家超级计算济南中心） | Real-time monitoring device for load working state of sound masking system under multi-load condition |
| CN110794334A (en) * | 2019-11-26 | 2020-02-14 | 武汉帆茂电子科技有限公司 | Universal signal line open-short circuit detection device and detection method adopting frequency mode |
| CN111176415A (en) * | 2019-12-29 | 2020-05-19 | 浪潮商用机器有限公司 | Double-phase power supply circuit and open circuit detection method |
| CN112269147A (en) * | 2020-10-19 | 2021-01-26 | 上海闻泰信息技术有限公司 | Detection device |
| CN112269149A (en) * | 2020-10-16 | 2021-01-26 | 深圳市沃特沃德股份有限公司 | Micro-current load open circuit detection circuit and terminal equipment |
| US11015750B2 (en) | 2017-09-07 | 2021-05-25 | Tianjin Datro Technology Co., Ltd. | Pipeline detection device and method |
| CN113702707A (en) * | 2021-08-05 | 2021-11-26 | 芯海科技（深圳）股份有限公司 | Load impedance measuring circuit, system and electronic equipment |
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| CN107516481A (en) * | 2017-08-18 | 2017-12-26 | 京东方科技集团股份有限公司 | Display module protection device and method, test board and display module |
| US11015750B2 (en) | 2017-09-07 | 2021-05-25 | Tianjin Datro Technology Co., Ltd. | Pipeline detection device and method |
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| CN107748305A (en) * | 2017-09-26 | 2018-03-02 | 九阳股份有限公司 | A kind of water purifier fault detection method and circuit |
| CN107797047B (en) * | 2017-09-27 | 2020-07-17 | 深圳和而泰智能控制股份有限公司 | Load state detection method and device and electronic equipment |
| CN107797047A (en) * | 2017-09-27 | 2018-03-13 | 深圳和而泰智能控制股份有限公司 | Load state detecting method, device and electronic equipment |
| CN109239514A (en) * | 2018-08-03 | 2019-01-18 | 重庆川仪自动化股份有限公司 | A kind of liquidometer short circuit sensor, open detection circuit |
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| CN110568290A (en) * | 2019-09-18 | 2019-12-13 | 山东省计算中心（国家超级计算济南中心） | Real-time monitoring device for load working state of sound masking system under multi-load condition |
| CN110794334A (en) * | 2019-11-26 | 2020-02-14 | 武汉帆茂电子科技有限公司 | Universal signal line open-short circuit detection device and detection method adopting frequency mode |
| CN110794334B (en) * | 2019-11-26 | 2022-09-30 | 武汉帆茂电子科技有限公司 | Universal signal line open-short circuit detection device and detection method adopting frequency mode |
| CN111176415A (en) * | 2019-12-29 | 2020-05-19 | 浪潮商用机器有限公司 | Double-phase power supply circuit and open circuit detection method |
| CN111176415B (en) * | 2019-12-29 | 2021-10-26 | 浪潮商用机器有限公司 | Double-phase power supply circuit and open circuit detection method |
| CN112269149A (en) * | 2020-10-16 | 2021-01-26 | 深圳市沃特沃德股份有限公司 | Micro-current load open circuit detection circuit and terminal equipment |
| CN112269147A (en) * | 2020-10-19 | 2021-01-26 | 上海闻泰信息技术有限公司 | Detection device |
| CN113702707A (en) * | 2021-08-05 | 2021-11-26 | 芯海科技（深圳）股份有限公司 | Load impedance measuring circuit, system and electronic equipment |
| CN115656876A (en) * | 2022-11-21 | 2023-01-31 | 上海海栎创科技股份有限公司 | Micro short circuit test circuit and test method |
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