CN106093578A - A kind of insulating resistor detecting circuit of inverter - Google Patents
A kind of insulating resistor detecting circuit of inverter Download PDFInfo
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- CN106093578A CN106093578A CN201610399547.2A CN201610399547A CN106093578A CN 106093578 A CN106093578 A CN 106093578A CN 201610399547 A CN201610399547 A CN 201610399547A CN 106093578 A CN106093578 A CN 106093578A
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- direct current
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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
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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Abstract
The invention discloses the insulating resistor detecting circuit of a kind of inverter, input including multi-channel DC, also include being connected in parallel on any one or being connected in parallel on respectively between any several direct currents input positive terminal and earth terminal, and/or the resistance branch between any one direct current input negative pole end and earth terminal；Resistance branch includes auxiliary resistance and the auxiliary switch being serially connected.The present invention makes to produce considerable influence with or without low resistance over the ground to detecting ohmically voltage swing, so that the easier detected module of low resistance detects over the ground, precision and sensitivity are high.The invention also discloses the insulating resistor detecting circuit of another kind of inverter, input including multi-channel DC, also include that N number of control of the break-make for controlling the direct current input of N road respectively switchs.Circuit can be changed into the circuit of single channel direct current input and detect by the present invention, thus the problem that precision is low and sensitivity is poor avoiding multi-channel DC to occur when inputting.
Description
Technical field
The present invention relates to inverter detection field, particularly relate to the insulating resistor detecting circuit of a kind of inverter.
Background technology
Detecting the insulation resistance of inverter is a kind of effective detection side judging whether inverter breaks down
Formula, when inverter breaks down, can produce low resistance Rg over the ground at direct current input positive terminal or direct current input negative pole end, see
Shown in Fig. 1 and Fig. 2, the structure of the insulating resistor detecting circuit of a kind of inverter when Fig. 1 is single channel direct current input in prior art
Schematic diagram (insulation against ground low resistance occurs in direct current input positive terminal)；When Fig. 2 is single channel direct current input in prior art, one is inverse
Become the structural representation (insulation against ground low resistance occurs in direct current input negative pole end) of the insulating resistor detecting circuit of device；Wherein,
Rird is detection resistance, and the voltage between PV+ and PV-is fixed value.In the case of figure 1, importing of Rg reduces PV+ over the ground
Resistance so that dividing potential drop between PV-to ground increases, the upper voltage of Rird increases, when detection module judges on Rird that voltage exceeds the
One predetermined threshold value then trigger protection, Fig. 2 is in like manner.
And when inverter has multi-channel DC to input, shown in Figure 3, when Fig. 3 is two-way direct current input in prior art
A kind of structural representation of the insulating resistor detecting circuit of inverter；If PV1 (voltage between PV1+ to PV1-) and the electricity of PV2
Pressure difference, R1+ and R2+ can not be considered as parallel connection, when PV1+ (or PV2+) occurs the most low-resistance, due on Rird
Electric current is the electric current sum of PV1 branch road and PV2 branch road, and PV2 branch road does not occur that low resistance over the ground, the electric current of PV2 branch road are
The electric current that normal condition produces, so time the upper low resistance over the ground occurred of PV1+ on the impact of electric current on Rird not greatly, and then
Make the voltage pulsation on Rird obvious not, have impact on precision and the sensitivity of detection.It addition, when PV1-(or PV2-) occur right
During ground low resistance, accuracy of detection and the sensitivity of current testing circuit are the most not high enough.
Therefore, the insulating resistor detecting circuit how providing a kind of accuracy of detection and the high inverter of sensitivity is this area
The problem that technical staff is presently required solution.
Summary of the invention
It is an object of the invention to provide the insulating resistor detecting circuit of a kind of inverter, make with or without low resistance over the ground detection
Ohmically voltage swing produces considerable influence so that low resistance is easier to detected module and detects over the ground, precision with
And sensitivity is high；It is a further object of the present invention to provide the insulating resistor detecting circuit of another kind of inverter, it is possible to turned by circuit
The circuit becoming the input of single channel direct current detects, thus when avoiding multi-channel DC to input, the precision of appearance is low and sensitivity is poor
Problem.
For solving above-mentioned technical problem, the invention provides the insulating resistor detecting circuit of a kind of inverter, straight including N road
Flow input and the detection resistance of negative pole insulation against ground resistant series and the detection module with described detection resistor coupled in parallel, every road
The input of described direct current all includes a direct current input positive terminal and a direct current input negative pole end, and the input of N number of described direct current is negative
Extreme the most all with the reference of described inverter hold and be connected, N, not less than 2, also includes:
It is connected in parallel on any one or is connected in parallel on respectively between any several described direct currents input positive terminal and described earth terminal,
And/or the resistance branch between any one of direct current input negative pole end and described earth terminal；Described resistance branch includes phase
The auxiliary resistance connected mutually and auxiliary switch；
Described detection module, in parallel described between any one of direct current input negative pole end and described earth terminal
Resistance branch, and after closing the described auxiliary switch in described resistance branch, it is judged that whether the ohmically magnitude of voltage of described detection
Higher than the first predetermined threshold value, there is low resistance over the ground in the direct current input positive terminal of the most described inverter, and trigger protection operates；
At any one or input described resistance branch in parallel between positive terminal and described earth terminal at any several described direct currents respectively,
And after closing the described auxiliary switch in whole described resistance branch, it is judged that whether the ohmically magnitude of voltage of described detection is less than the
Two predetermined threshold value, there is low resistance over the ground in the direct current input negative pole end of the most described inverter, and trigger protection operates.
Preferably, described insulating resistor detecting circuit includes a positive pole insulation against ground resistance；Each described direct current inputs
Positive terminal positive pole with a diode respectively is connected, the negative pole of N number of described diode all with described positive pole insulation against ground resistance
The first end be connected, the second end of described positive pole insulation against ground resistance is connected with described earth terminal；Described positive pole insulation against ground electricity
Resistance two ends are parallel with described resistance branch.
Preferably, described insulating resistor detecting circuit includes N number of positive pole insulation against ground resistance；Each described direct current just inputs
The first end with a described positive pole insulation against ground resistance is connected the most respectively, the second of N number of described positive pole insulation against ground resistance
End is all connected with described earth terminal；At any one or respectively in the parallel connection of the two ends of any several described positive pole insulation against ground resistance
There is described resistance branch.
Preferably, described auxiliary resistance is the resistance of 100k Ω.
For solving above-mentioned technical problem, present invention also offers the insulating resistor detecting circuit of a kind of inverter, including N road
The detection resistance and the detection module with described detection resistor coupled in parallel of direct current input and negative pole insulation against ground resistant series, often
Direct current input described in road all includes a direct current input positive terminal and a direct current input negative pole end, and N number of described direct current inputs
Negative pole end all with the reference of described inverter hold and be connected, N is not less than 2, also includes:
For controlling N number of control switch of the break-make of direct current input described in N road respectively；
Described detection module, for all disconnecting when Guan Bi any one of control switch and remaining described switch that controls
Time, it is judged that whether the ohmically magnitude of voltage of described detection is higher than the first predetermined threshold value, and the described control switch if so, closed is residing
A road described in the direct current input positive terminal of direct current input low resistance over the ground occurs, trigger protection operates, it is judged that described detection electricity
Whether the magnitude of voltage in resistance is less than the second predetermined threshold value, and direct current described in the road residing for described control switch if so, closed is defeated
There is low resistance over the ground in the direct current input negative pole end entered, and trigger protection operates.
Preferably, described insulating resistor detecting circuit includes a positive pole insulation against ground resistance；
N number of described direct current input positive terminal is connected with the first end of corresponding described control switch respectively, N number of described control
Second end of switch all the first ends with described positive pole insulation against ground resistance are connected, the second end of described positive pole insulation against ground resistance
It is connected with described earth terminal.
Preferably, described insulating resistor detecting circuit includes N number of positive pole insulation against ground resistance；
N number of described direct current input positive terminal is connected with the first end of corresponding described control switch respectively, N number of described control
Second end of switch is connected with the first end of corresponding described positive pole insulation against ground resistance respectively, N number of described positive pole insulation against ground
Second end of resistance is all connected with described earth terminal.
Preferably, described insulating resistor detecting circuit includes N number of positive pole insulation against ground resistance；
N number of described direct current input positive terminal is connected with the first end of corresponding described positive pole insulation against ground resistance respectively, N number of
Second end of described positive pole insulation against ground resistance is connected with the first end of corresponding described control switch respectively, N number of described control
Second end of switch is all connected with described earth terminal.
Preferably, N number of described switch that controls holds it with being series at N number of described direct current input negative pole end and described reference respectively
Between.
The invention provides the insulating resistor detecting circuit of a kind of inverter, including being connected in parallel on any one or parallel connection respectively
Between any several direct currents input positive terminal and earth terminal, and/or between any one direct current input negative pole end and earth terminal
Resistance branch.If resistance branch is connected in parallel between any one direct current input negative pole end and earth terminal, when closed resistance branch road
After interior auxiliary switch, the direct current input negative pole end resistance to ground can be reduced, and then increase direct current input positive terminal to ground
Voltage, if low resistance Rg over the ground occurs in now any one direct current input positive terminal, the also ratio of the voltage on Rg is in prior art
Voltage on Rg wants big, therefore can have considerable influence to detecting ohmically electric current with or without Rg, thus to detecting ohmically electricity
Pressure size produces considerable influence, and the Rg making direct current input positive terminal occur is easier to detected module and detects, precision and
Sensitivity is high；
If resistance branch be connected in parallel on any one or be connected in parallel on respectively any several direct currents input positive terminal and earth terminal it
Between, when, after the auxiliary switch in closed resistance branch road, the direct current input positive terminal resistance to ground being reduced, and then increase direct current
Input negative pole end to ground voltage, now direct current input negative pole end over the ground between with or without Rg can to detection ohmically voltage swing
Affect greatly, so that the Rg that direct current input negative pole end occurs is easier to detected module and detects, precision and quick
Sensitivity is high.
Present invention also offers the insulating resistor detecting circuit of a kind of inverter, including defeated for controlling N road direct current respectively
N number of control switch of the break-make entered, it is desirable to when detecting the input of which direct current, the control switch that can be inputted by remaining direct current is disconnected
Open, only close the control switch of this direct current input, so time circuit become the circuit of single channel direct current input, thus avoid
The problem that precision is low and sensitivity is poor occurred during multi-channel DC input.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, below will be to institute in prior art and embodiment
The accompanying drawing used is needed to be briefly described, it should be apparent that, the accompanying drawing in describing below is only some enforcements of the present invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtains according to these accompanying drawings
Obtain other accompanying drawing.
The structural representation of the insulating resistor detecting circuit of a kind of inverter when Fig. 1 is single channel direct current input in prior art
(there is insulation against ground low resistance in direct current input positive terminal)；
The structural representation of the insulating resistor detecting circuit of a kind of inverter when Fig. 2 is single channel direct current input in prior art
(there is insulation against ground low resistance in direct current input negative pole end)；
The structural representation of the insulating resistor detecting circuit of a kind of inverter when Fig. 3 is two-way direct current input in prior art
Figure；
A kind of structure of the embodiment of the insulating resistor detecting circuit of a kind of inverter that Fig. 4 provides for present invention during N=2
Schematic diagram (parallel resistance branch road between direct current input negative pole end and earth terminal)；
The knot of the another kind of embodiment of the insulating resistor detecting circuit of a kind of inverter that Fig. 5 provides for present invention during N=2
Structure schematic diagram (parallel resistance branch road between direct current input positive terminal and earth terminal)；
The knot of the another kind of embodiment of the insulating resistor detecting circuit of a kind of inverter that Fig. 6 provides for present invention during N=2
Structure schematic diagram (parallel resistance branch road between direct current input positive terminal and earth terminal)；
The knot of the another kind of embodiment of the insulating resistor detecting circuit of a kind of inverter that Fig. 7 provides for present invention during N=2
Structure schematic diagram (inputs between positive terminal and earth terminal and equal parallel resistance between direct current input negative pole end and earth terminal at direct current
Branch road)；
A kind of knot of the embodiment of the insulating resistor detecting circuit of the another kind of inverter that Fig. 8 provides for present invention during N=2
Structure schematic diagram (controls switch to be connected between direct current input positive terminal and earth terminal)；
The another kind of embodiment of the insulating resistor detecting circuit of the another kind of inverter that Fig. 9 provides for present invention during N=2
Structural representation (controls switch to be connected between direct current input positive terminal and earth terminal)；
The another kind of embodiment of the insulating resistor detecting circuit of the another kind of inverter that Figure 10 provides for present invention during N=2
Structural representation (control switch be connected on direct current input positive terminal and earth terminal between)；
The another kind of embodiment of the insulating resistor detecting circuit of the another kind of inverter that Figure 11 provides for present invention during N=2
Structural representation (control switch be connected on direct current input negative pole end and with reference to hold between).
Wherein:
Rird detection resistance, WSL are with reference to ground end, Earth earth terminal, R negative pole insulation against ground resistance, PV+
(PV1+, PV2+) direct current input positive terminal, PV-(PV1-, PV2-) direct current input negative pole end, R+ (R1+, R2+) positive pole
Insulation against ground resistance.
Detailed description of the invention
The core of the present invention is to provide the insulating resistor detecting circuit of a kind of inverter, makes with or without low resistance over the ground detection
Ohmically voltage swing produces considerable influence so that low resistance is easier to detected module and detects over the ground, precision with
And sensitivity is high；Another core of the present invention is to provide the insulating resistor detecting circuit of another kind of inverter, it is possible to turned by circuit
The circuit becoming the input of single channel direct current detects, thus when avoiding multi-channel DC to input, the precision of appearance is low and sensitivity is poor
Problem.
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under not making creative work premise, broadly falls into the scope of protection of the invention.
The invention provides the insulating resistor detecting circuit of a kind of inverter, the most exhausted with negative pole including the input of N road direct current
Edge resistant series detection resistance and with detection resistor coupled in parallel detection module, every road direct current input all include that a direct current is defeated
Enter positive terminal and direct current input negative pole end, N number of direct current input negative pole end all with the reference of inverter hold and be connected, N is not
Less than 2, also include:
It is connected in parallel on any one or is connected in parallel on respectively between any several direct currents input positive terminal and earth terminal, and/or appointing
A direct current of anticipating inputs the resistance branch between negative pole end and earth terminal；Resistance branch include the auxiliary resistance that is serially connected and
Auxiliary switch；
Detection module, for parallel resistance branch road between any one direct current input negative pole end and earth terminal, and Guan Bi
After auxiliary switch in resistance branch, it is judged that whether detect ohmically magnitude of voltage higher than the first predetermined threshold value, if so, inverter
Direct current input positive terminal low resistance over the ground occurs, trigger protection operates；Any one or defeated at any several direct currents respectively
Enter parallel resistance branch road between positive terminal and earth terminal, and after closing the auxiliary switch in whole resistance branch, it is judged that detection electricity
Whether the magnitude of voltage in resistance is less than the second predetermined threshold value, and if so, low resistance over the ground occurs in the direct current input negative pole end of inverter, touches
Send out protection operation.
If it is understood that resistance branch is connected in parallel between any one direct current input negative pole end and earth terminal, when closing
After closing the auxiliary switch in resistance branch, the direct current input negative pole end resistance to ground can be reduced, and then just increase direct current input
The extreme voltage to ground, if there is low resistance Rg over the ground in now any one direct current input positive terminal, the voltage on Rg also than
In prior art, the voltage on Rg wants big, therefore can have considerable influence to detecting ohmically electric current with or without Rg, thus to detection
Ohmically voltage swing produces considerable influence, and the Rg making direct current input positive terminal occur is easier to detected module and detects
Coming, precision and sensitivity are high.
If resistance branch be connected in parallel on any one or be connected in parallel on respectively any several direct currents input positive terminal and earth terminal it
Between, when, after the auxiliary switch in closed resistance branch road, the direct current input positive terminal resistance to ground being reduced, and then increase direct current
Input negative pole end to ground voltage, now direct current input negative pole end over the ground between with or without Rg can to detection ohmically voltage swing
Affect greatly, so that the Rg that direct current input negative pole end occurs is easier to detected module and detects, precision and quick
Sensitivity is high.
Therefore the size of auxiliary resistance here should be much smaller than positive pole insulation against ground resistance and negative pole insulation against ground resistance
Size, makes the ohmically voltage in parallel with auxiliary resistance have significantly reduction.Such as, auxiliary resistance is the electricity of 100k Ω
Resistance.Certainly, the present invention does not limit the resistance size of auxiliary resistance.If in multiple direct currents input positive terminal and negative pole end parallel resistance
If branch road, the resistance of the different auxiliary resistances in resistance branch can be the same or different, and this is not limited by the present invention
Fixed, staff can determine according to practical situation.
It addition, the present invention does not limit the first predetermined threshold value and the size of the second predetermined threshold value, staff can be according to reality
Border situation is decided in its sole discretion.
It should be noted that when inverter normally works, auxiliary switch should be in off-state, i.e. each resistance and prop up
Circuit is not the most accessed on road.If resistance branch is to be connected in parallel between any one direct current input negative pole end and earth terminal, if thinking
Whether direct current input negative pole end is occurred that low resistance detects over the ground, then needs to disconnect auxiliary switch；If resistance branch is also
Being associated in any one or be connected in parallel on respectively between any several direct current input grounding end, if wanting to direct current input positive terminal being
No appearance low resistance over the ground detects, then need to disconnect whole auxiliary switch.
Concrete, the present invention includes following example.
Embodiment one
Parallel resistance branch road between any one direct current input negative pole end and earth terminal.
Shown in Figure 4, the one of the insulating resistor detecting circuit of a kind of inverter that Fig. 4 provides for present invention during N=2
The structural representation (parallel resistance branch road between direct current input negative pole end and earth terminal) of embodiment.In Fig. 4, R-2 assists
Resistance, S-auxiliary switch.
Wherein, the present invention does not limit auxiliary resistance and the order of auxiliary switch in resistance branch, i.e. can select order auxiliary
One end of resistance is connected with direct current input negative pole end, and one end of auxiliary switch is connected with earth terminal, it is also possible to make auxiliary resistance
One end is connected with earth terminal, and one end of auxiliary switch is connected with direct current input negative pole end, and this is not particularly limited by the present invention.
It is understood that due to N number of direct current input negative pole end all with reference to hold and be connected, therefore defeated at any one direct current
Enter parallel resistance branch road between negative pole end and earth terminal and i.e. can reach the purpose of the present invention.
Embodiment two
Insulating resistor detecting circuit includes N number of positive pole insulation against ground resistance；Each direct current input positive terminal respectively with one
First end of positive pole insulation against ground resistance is connected, and the second end of N number of positive pole insulation against ground resistance is all connected with earth terminal；Arbitrarily
One or respectively two ends at any several positive pole insulation against ground resistance be parallel with resistance branch.
Shown in Figure 5, another of insulating resistor detecting circuit of a kind of inverter that Fig. 5 provides for present invention during N=2
Plant the structural representation (parallel resistance branch road between direct current input positive terminal and earth terminal) of embodiment.In Fig. 5, R1+2, R2+
2 auxiliary resistances, S+1, S+2 auxiliary switch.
Wherein, the present invention does not limit auxiliary resistance and the order of auxiliary switch in resistance branch, i.e. can select order auxiliary
One end of resistance is connected with direct current input positive terminal, and one end of auxiliary switch is connected with earth terminal, it is also possible to make auxiliary resistance
One end is connected with earth terminal, and one end of auxiliary switch is connected with direct current input positive terminal, and this is not particularly limited by the present invention.Separately
Outward, when being parallel with resistance branch when there being multiple direct current to input between positive terminal and earth terminal, auxiliary resistance in each resistance branch
Can be the same or different with the order of auxiliary switch, this is not construed as limiting by the present invention.
Embodiment three
Insulating resistor detecting circuit includes a positive pole insulation against ground resistance；Each direct current input positive terminal respectively with one
The positive pole of diode is connected, and the negative pole of N number of diode all the first ends with positive pole insulation against ground resistance are connected, positive pole insulation against ground
Second end of resistance is connected with earth terminal；Positive pole insulation against ground resistance two ends are parallel with resistance branch.
Shown in Figure 6, another of insulating resistor detecting circuit of a kind of inverter that Fig. 6 provides for present invention during N=2
Plant the structural representation (parallel resistance branch road between direct current input positive terminal and earth terminal) of embodiment.In Fig. 6, R+2 is auxiliary
Help resistance, S+ auxiliary switch.
Wherein, D1 and D2 is diode, and direct current input positive terminal is connected with the positive pole of diode, the negative pole of diode and just
Insulation against ground resistance in pole is connected.
It is understood that when the voltage difference of two-way direct current input, two direct current input positive terminals have voltage difference,
If being not provided with diode to limit the flow direction of electric current, due to two direct currents input positive terminals all with positive pole insulation against ground resistance phase
Even, then can form loop between two direct current input positive terminals, and this loop is only made up of wire, resistance value is minimum, therefore can lead
Send a telegraph stream greatly, and then burn out circuit.Therefore must be provided with under this kind of circuit structure limiting the diode of current direction to ensure electricity
The safety on road.
Embodiment four
At any one or respectively between any several direct currents input positive terminal and earth terminal, and any one direct current
Equal parallel resistance branch road between input negative pole end and earth terminal.
Shown in Figure 7, another of insulating resistor detecting circuit of a kind of inverter that Fig. 7 provides for present invention during N=2
The structural representation of kind of embodiment (between direct current input positive terminal and earth terminal and direct current input negative pole end and earth terminal it
Between equal parallel resistance branch roads).In Fig. 7, R1+2, R2+2, R-2 auxiliary resistance, S+1, S+2, S-auxiliary switch.
Wherein, invention does not limit auxiliary resistance and the order of auxiliary switch in resistance branch.
It addition, the present invention does not limit the numerical value of N, staff can decide in its sole discretion according to actual needs.
The invention provides the insulating resistor detecting circuit of a kind of inverter, if it is straight that resistance branch is connected in parallel on any one
Between stream input negative pole end and earth terminal, the direct current input positive terminal voltage to ground can be increased, if now any one direct current is defeated
Enter positive terminal and low resistance Rg over the ground occur, also can increase the voltage on Rg, make with or without Rg can to detect ohmically electric current have
Considerable influence, thus produce considerable influence to detecting ohmically voltage swing, the Rg making direct current input positive terminal occur more holds
The most detected module detects, and improves accuracy of detection and sensitivity；
If resistance branch be connected in parallel on any one or be connected in parallel on respectively any several direct currents input positive terminal and earth terminal it
Between, the direct current input positive terminal resistance to ground can be reduced, and then increase the direct current input negative pole end voltage to ground, now direct current
Input negative pole end over the ground between can affect greatly detecting ohmically voltage swing with or without Rg, so that direct current input is negative
The extreme Rg occurred is easier to detected module and detects, and improves accuracy of detection and sensitivity.
Present invention also offers the insulating resistor detecting circuit of a kind of inverter, including N road direct current input and negative pole over the ground
What insulation resistance was connected detects resistance and the detection module with detection resistor coupled in parallel, and direct current input in every road all includes a direct current
Input positive terminal and direct current input negative pole end, N number of direct current input negative pole end all with the reference of inverter hold and be connected, N
Not less than 2, also include:
For controlling N number of control switch of the break-make of N road direct current input respectively；
Detection module, for when closing any one control switch and remaining control switch all disconnects, it is judged that detection is electric
Whether the magnitude of voltage in resistance is higher than the first predetermined threshold value, and if so, close controls the direct current of the road direct current input residing for switch
There is low resistance over the ground in input positive terminal, and trigger protection operates, it is judged that detect whether ohmically magnitude of voltage is preset less than second
Threshold value, there is low resistance over the ground, triggers in the direct current input negative pole end controlling the road direct current input residing for switch if so, closed
Protection operation.
Concrete, this testing circuit includes following example, and wherein, S+1, S+2, S-1, S-2 control switch.
Embodiment five
Insulating resistor detecting circuit includes a positive pole insulation against ground resistance；
N number of direct current input positive terminal is connected with corresponding the first end controlling switch respectively, N number of the second end controlling switch
All the first ends with positive pole insulation against ground resistance are connected, and the second end of positive pole insulation against ground resistance is connected with earth terminal.
Shown in Figure 8, the one of the insulating resistor detecting circuit of the another kind of inverter that Fig. 8 provides for present invention during N=2
Plant the structural representation (controlling switch to be connected between direct current input positive terminal and earth terminal) of embodiment.
Embodiment six
Insulating resistor detecting circuit includes N number of positive pole insulation against ground resistance；
N number of direct current input positive terminal is connected with corresponding the first end controlling switch respectively, N number of the second end controlling switch
Being connected with the first end of corresponding positive pole insulation against ground resistance respectively, the second end of N number of positive pole insulation against ground resistance is all and ground connection
End is connected.
Shown in Figure 9, insulating resistor detecting circuit another of the another kind of inverter that Fig. 9 provides for present invention during N=2
A kind of structural representation (controlling switch to be connected between direct current input positive terminal and earth terminal) of embodiment.
Embodiment seven
Insulating resistor detecting circuit includes N number of positive pole insulation against ground resistance；
N number of direct current input positive terminal is connected with the first end of corresponding positive pole insulation against ground resistance respectively, and N number of positive pole is over the ground
Second end of insulation resistance is connected with corresponding the first end controlling switch respectively, and N number of the second end controlling switch is all and ground connection
End is connected.
Shown in Figure 10, the insulating resistor detecting circuit of the another kind of inverter that Figure 10 provides for present invention during N=2
The structural representation (controlling switch to be connected between direct current input positive terminal and earth terminal) of another kind of embodiment.
Embodiment eight
Between N number of control switch is held with being series at N number of direct current input negative pole end and reference respectively.
Shown in Figure 11, the insulating resistor detecting circuit of the another kind of inverter that Figure 11 provides for present invention during N=2
The structural representation (between control switch is held with being connected on direct current input negative pole end and reference) of another kind of embodiment.
It is understood that a road direct current input includes a direct current input positive terminal and a direct current input negative pole
End, as long as disconnecting either end therein can disconnect this road direct current input.
Can use any of the above embodiment in the actual application of staff, this is not construed as limiting by the present invention.
Present invention also offers the insulating resistor detecting circuit of a kind of inverter, including defeated for controlling N road direct current respectively
N number of control switch of the break-make entered, it is desirable to when detecting the input of which direct current, the control switch that can be inputted by remaining direct current is disconnected
Open, only close the control switch of this direct current input, so time circuit become the circuit of single channel direct current input, thus avoid
The problem that precision is low and sensitivity is poor occurred during multi-channel DC input.
In this specification, each embodiment uses the mode gone forward one by one to describe, and what each embodiment stressed is and other
The difference of embodiment, between each embodiment, identical similar portion sees mutually.For device disclosed in embodiment
For, owing to it corresponds to the method disclosed in Example, so describe is fairly simple, relevant part sees method part and says
Bright.
Also, it should be noted in this manual, the relational terms of such as first and second or the like be used merely to by
One entity or operation separate with another entity or operating space, and not necessarily require or imply these entities or operation
Between exist any this reality relation or order.And, term " includes ", " comprising " or its any other variant meaning
Containing comprising of nonexcludability, so that include that the process of a series of key element, method, article or equipment not only include that
A little key elements, but also include other key elements being not expressly set out, or also include for this process, method, article or
The key element that equipment is intrinsic.In the case of there is no more restriction, statement " including ... " key element limited, do not arrange
Except there is also other identical element in including the process of described key element, method, article or equipment.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.
Multiple amendment to these embodiments will be apparent from for those skilled in the art, as defined herein
General Principle can realize without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein and features of novelty phase one
The widest scope caused.
Claims (9)
1. the insulating resistor detecting circuit of an inverter, it is characterised in that include the direct current input of N road and negative pole insulation against ground
The detection resistance and the detection module with described detection resistor coupled in parallel of resistant series, direct current input described in every road all includes one
Direct current input positive terminal and direct current input negative pole end, N number of described direct current input negative pole end all with the ginseng of described inverter
Hold connected with examining, N is not less than 2, also includes:
It is connected in parallel on any one or is connected in parallel on respectively between any several described direct currents input positive terminal and earth terminal, and/or appointing
A described direct current of anticipating inputs the resistance branch between negative pole end and described earth terminal；Described resistance branch includes being serially connected
Auxiliary resistance and auxiliary switch；
Described detection module, for described resistance in parallel between any one of direct current input negative pole end and described earth terminal
Branch road, and after closing the described auxiliary switch in described resistance branch, it is judged that whether the ohmically magnitude of voltage of described detection is higher than
First predetermined threshold value, there is low resistance over the ground in the direct current input positive terminal of the most described inverter, and trigger protection operates；In office
Anticipate one or described resistance branch in parallel between any several described direct currents input positive terminal and described earth terminal respectively, and close
After closing the described auxiliary switch in whole described resistance branch, it is judged that the ohmically magnitude of voltage of described detection is the most pre-less than second
If threshold value, there is low resistance over the ground in the direct current input negative pole end of the most described inverter, and trigger protection operates.
Insulating resistor detecting circuit the most according to claim 1, it is characterised in that described insulating resistor detecting circuit includes
One positive pole insulation against ground resistance；Each described direct current inputs the positive terminal positive pole respectively with a diode and is connected, N number of described
The negative pole of diode all the first ends with described positive pole insulation against ground resistance are connected, the second end of described positive pole insulation against ground resistance
It is connected with described earth terminal；Described positive pole insulation against ground resistance two ends are parallel with described resistance branch.
Insulating resistor detecting circuit the most according to claim 1, it is characterised in that described insulating resistor detecting circuit includes
N number of positive pole insulation against ground resistance；Each described direct current input positive terminal respectively with the of a described positive pole insulation against ground resistance
One end is connected, and the second end of N number of described positive pole insulation against ground resistance is all connected with described earth terminal；At any one or exist respectively
The two ends of any several described positive pole insulation against ground resistance are parallel with described resistance branch.
4. according to the insulating resistor detecting circuit described in any one of claim 1-3, it is characterised in that described auxiliary resistance is
The resistance of 100k Ω.
5. the insulating resistor detecting circuit of an inverter, it is characterised in that include the direct current input of N road and negative pole insulation against ground
The detection resistance and the detection module with described detection resistor coupled in parallel of resistant series, direct current input described in every road all includes one
Direct current input positive terminal and direct current input negative pole end, N number of described direct current input negative pole end all with the ginseng of described inverter
Hold connected with examining, N is not less than 2, also includes:
For controlling N number of control switch of the break-make of direct current input described in N road respectively；
Described detection module, for when closing any one of control switch and remaining described control switch all disconnects, sentencing
Whether the disconnected ohmically magnitude of voltage of described detection is higher than the first predetermined threshold value, residing for described control switch if so, closed
There is low resistance over the ground in the direct current input positive terminal of direct current input described in road, and trigger protection operates, it is judged that on described detection resistance
Magnitude of voltage whether less than the second predetermined threshold value, direct current input described in the road residing for described control switch if so, closed
There is low resistance over the ground in direct current input negative pole end, and trigger protection operates.
Insulating resistor detecting circuit the most according to claim 5, it is characterised in that described insulating resistor detecting circuit includes
One positive pole insulation against ground resistance；
N number of described direct current input positive terminal is connected with the first end of corresponding described control switch respectively, N number of described control switch
The second end all the first ends with described positive pole insulation against ground resistance be connected, the second end of described positive pole insulation against ground resistance with connect
Ground end is connected.
Insulating resistor detecting circuit the most according to claim 5, it is characterised in that described insulating resistor detecting circuit includes
N number of positive pole insulation against ground resistance；
N number of described direct current input positive terminal is connected with the first end of corresponding described control switch respectively, N number of described control switch
The second end be connected with the first end of corresponding described positive pole insulation against ground resistance respectively, N number of described positive pole insulation against ground resistance
The second end be all connected with described earth terminal.
Insulating resistor detecting circuit the most according to claim 5, it is characterised in that described insulating resistor detecting circuit includes
N number of positive pole insulation against ground resistance；
N number of described direct current input positive terminal is connected with the first end of corresponding described positive pole insulation against ground resistance respectively, N number of described
Second end of positive pole insulation against ground resistance is connected with the first end of corresponding described control switch respectively, and N number of described control switchs
The second end be all connected with described earth terminal.
Insulating resistor detecting circuit the most according to claim 5, it is characterised in that N number of described switch that controls is connected respectively
Between N number of described direct current is held with inputting negative pole end and described reference.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610399547.2A CN106093578A (en) | 2016-06-07 | 2016-06-07 | A kind of insulating resistor detecting circuit of inverter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610399547.2A CN106093578A (en) | 2016-06-07 | 2016-06-07 | A kind of insulating resistor detecting circuit of inverter |
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| CN106093578A true CN106093578A (en) | 2016-11-09 |
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| CN201610399547.2A Pending CN106093578A (en) | 2016-06-07 | 2016-06-07 | A kind of insulating resistor detecting circuit of inverter |
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Application publication date: 20161109 |