CN207780205U - A kind of high-voltage DC power supply ground insulation impedance detection circuit - Google Patents
A kind of high-voltage DC power supply ground insulation impedance detection circuit Download PDFInfo
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- CN207780205U CN207780205U CN201721462793.4U CN201721462793U CN207780205U CN 207780205 U CN207780205 U CN 207780205U CN 201721462793 U CN201721462793 U CN 201721462793U CN 207780205 U CN207780205 U CN 207780205U
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Abstract
The utility model discloses a kind of high-voltage DC power supply ground insulation impedance detection circuits, including the first load that one end is connected with positive pole to be measured, the resistance handover module for the second load and Y-shaped structure that one end is connected with power cathode to be measured.Wherein resistance handover module includes three branches, and the first branch includes first switch, and one end is connected to positive pole to be measured；The second branch includes second switch, and one end is connected to power cathode to be measured；Third branch includes resistance, one end ground connection.Program median generatrix direct-to-ground capacitance size does not influence measurement accuracy, and detection speed is fast.The resistance of resistance handover module third branch road can be shared so that the circuit topological structure is simple, and floor space is small by the switching of switch simultaneously.
Description
Technical field
The utility model is related to power electronics fields, exhausted over the ground more specifically to a kind of high-voltage DC power supply
The circuit of edge impedance detection.
Background technology
When DC power supply (such as electric powered motor accumulator, photovoltaic array) ground insulation resistance is bad or resistance value is less than
When specified value, high pressure is formed over the ground, and then makes the outer casing electrification of the equipment using the DC power supply, not only fragile equipment, also
Grave danger is brought to personal safety.Therefore, it is necessary to high-voltage DC power supply ground insulation resistance is detected in time, so as to
Corresponding regulation measure is taken in time, ensures that insulation impedance meets prescribed requirement always.
Existing insulation impedance detection technique is mainly balance bridge method, non-equilibrium bridge method etc..
Balanced bridge method circuit topological structure is shown in Fig. 1 a, be with the equivalent ground resistance R of DC power supply positive and negative anodesp、RnResistance value
The electric bridge of identical two resistance composition, by finding out insulation against ground resistance value to the current potential at the both ends A, B to be compared.Its
In, Rp、RnDC power supply positive and negative electrode ground insulation resistance is indicated respectively.But work as Rp=RnWhen ≠ ∞, i.e., positive and negative anodes ground connection etc.
Imitate resistance Rp、RnWhen resistance value approaches, declines on an equal basis, two endpoint current potentials of A, B will not change, therefore balance bridge method cannot be surveyed
Measure balanced insulation impedance.
Non-equilibrium bridge method circuit topological structure is shown in Fig. 1 b, by the equivalent ground resistance R of DC power supply positive and negative anodesp、RnWith belt switch
Conditioned circuit form electric bridge, by control switch on-off change equivalent resistance on series voltage value, structure two dimensional equation ask
Go out insulation impedance resistance value.Due to needing positive and negative busbar to put into resistance over the ground respectively in measurement, positive and negative busbar voltage-to-ground is variation
's.It there are charge and discharge needs that Bus Voltage is waited for stablize after input resistance every time, there are time delays, and are easy by busbar
Direct-to-ground capacitance influences.Work as Rp>>RnWhen, cause to change R merelynEquivalent parallel resistance and positive and negative anodes voltage-to-ground variation very
It is small, it cannot be satisfied the required precision within error 5% at this time.
High-voltage DC power supply ground insulation resistance detect existing method in, can be with calculated equilibrium insulation impedance in the case of,
The circuit structure of detection high voltage direct current ground insulation resistance is complex with high precision, takes up a large area.
Utility model content
The utility model embodiment provides a kind of high voltage power supply direct current ground insulation impedance detection circuit, at least to solve
It in the related technology can not be in the case of can be with calculated equilibrium resistance, with degree of precision detection high voltage direct current ground insulation resistance electricity
Line structure is complicated, the problem of taking up a large area.
Embodiment according to the present utility model provides a kind of high-voltage DC power supply ground insulation impedance detection circuit, packet
It includes：
The first load that one end is connected with positive pole to be measured, the second load and Y that one end is connected with power cathode to be measured
The resistance handover module of shape structure, wherein：Resistance handover module includes three branches, wherein：The first branch includes first switch,
One end is connected to positive pole to be measured；The second branch includes second switch, and one end is connected to power cathode to be measured；Third branch packet
Include resistance, one end ground connection.
Preferably, the resistance value value range that first load, described second load is 100K Ω~10M Ω.
Preferably, the resistance value range positioned at third branch road is 10K Ω~100K Ω.
Preferably, the first switch, the second switch are arbitrary in relay switch, optical coupled switch or metal-oxide-semiconductor switch
It is a kind of.
Further, when the first switch, the second switch disconnect, positive and negative busbar voltage-to-ground at this time is measured
The ratio between Q1；
When the first switch is closed, and the second switch disconnects, with RbIndicate the third branch and described second
The parallel equivalent resistance of load measures the ratio between positive and negative busbar voltage-to-ground Q at this time2；
When the first switch disconnects, and the second switch is closed, with RaIndicate the third branch and described first
The parallel equivalent resistance of load measures the ratio between positive and negative busbar voltage-to-ground Q at this time3；
The positive pole can be acquired, and equivalent resistance is over the groundThe power cathode equivalent electricity over the ground
Resistance value isWherein, R1、R2The resistance value of first load, second load is indicated respectively.
It can be seen from the above technical scheme that compared to the prior art, the program increases on the basis of balancing circuitry
Resistance handover module does not influence measurement accuracy retaining balancing circuitry busbar direct-to-ground capacitance size, under the fast advantage of detection speed,
The parallel resistance that power supply equivalent resistance to be measured can be switched by resistance handover module simultaneously, has reached the mesh for measuring balance resistance
's.The resistance of resistance handover module third branch road can be shared so that the circuit topological structure by the switching of switch simultaneously
Simply, floor space is small.
Description of the drawings
Attached drawing described herein is used to provide a further understanding of the present invention, and is constituted part of this application,
The exemplary embodiment of the utility model and the description thereof are used to explain the utility model, does not constitute the improper limit to the present invention
It is fixed.In the accompanying drawings：
Fig. 1 a are that ground insulation resistance detects balance bridge method electrical block diagram in the prior art；
Fig. 1 b are that ground insulation resistance detects non-equilibrium bridge method electrical block diagram in the prior art；
Fig. 2 is according to a kind of high-voltage DC power supply ground insulation impedance detection circuit knot disclosed in the utility model embodiment
Structure schematic diagram；
Fig. 3 is equivalent circuit structure schematic diagram of the circuit shown in Fig. 2 when first switch is closed, second switch disconnects；
Fig. 4 is that circuit shown in Fig. 2 is disconnected in first switch, equivalent circuit structure schematic diagram when second switch is closed；
Specific implementation mode
The utility model is described in detail below with reference to attached drawing and in conjunction with the embodiments.It should be noted that not rushing
In the case of prominent, the features in the embodiments and the embodiments of the present application can be combined with each other.
The utility model embodiment provides a kind of ground insulation impedance detection, circuit and with the circuit sets
It is standby, to solve the problems, such as that existing detection scheme detection is inaccurate.
It should be noted that term " first " in the specification and claims of the utility model and above-mentioned attached drawing,
" second " etc. is for distinguishing similar object, without being used to describe specific sequence or precedence.
The detection circuit embodiment that the embodiment of the present application one is provided can detect high voltage direct current ground insulation resistance, be applied to
The detection of electric powered motor accumulator, photovoltaic array solar panel insulating properties.
In the following, providing a kind of specific topological structure of high voltage direct current ground insulation resistance circuit.Referring to Fig. 2, but not with
This is as limitation.
High voltage direct current power sense circuit includes first resistor R1, second resistance R2,3rd resistor R3, first switch K1,
Second switch K2；
Wherein, the one end R1 and high-voltage DC power supply anode V to be measured+It is connected, other end ground connection is parallel to high straightening to be measured
Flow positive pole equivalent insulation resistance R over the groundp；
The one end R2 and high-voltage DC power supply cathode V to be measured﹣It is connected, other end ground connection is parallel to high voltage direct current to be measured
Source cathode equivalent insulation resistance R over the groundn；
First switch K1, second switch K2,3rd resistor R3 are connected with Y-shaped structure, wherein first switch one end with it is to be measured
High-voltage DC power supply anode V+It is connected, second switch one end and high-voltage DC power supply cathode V to be measured﹣It is connected, the one end 3rd resistor R3
Ground connection.
First power supply is delivered the other end of K1 and positive pole V after switch K1 connects with the second delivery switch K2+It is connected,
The other end of K2 is connected with power cathode V.
The one end 3rd resistor R3 is grounded, and other end is connected between the delivery switches of the first delivery switch K1 and second K2.
It can be relay switch, optical coupled switch, MOS switch to deliver switch K1, K2.
R1, R2 resistance value are generally between 100K Ω~10M Ω in the insulation resistance detection circuit, it can be ensured that insulating monitoring
Device detection kilo-ohm is to the other insulation resistance of mega-ohms.R3 be resistance handover module in resistive element, resistance value 10K Ω~
Between 100K Ω, the resistance value that can detect tens K Ω ranks is disconnected by the closure of K1, K2.
R3 is shared when resistance handover module switches the parallel resistance of power supply equivalent resistance to be measured, is ensuring high-precision feelings
Under condition, the volume and cost of insulation impedance monitoring modular are reduced.
It in addition, can it should be noted that first resistor R1, second resistance R2,3rd resistor R3 can be single resistance
To be the equivalent resistance being formed in parallel by multiple resistance strings.Similarly hereinafter.
In the following, based on circuit topological structure shown in Fig. 2, provides and calculate RpWith RnDerivation.Wherein, Rp、RnTable respectively
Show DC power supply positive and negative electrode ground insulation resistance.
For convenience of calculation two constants are defined for convenience of calculation：
The parallel equivalent resistance R of R1 and R3a：
The parallel equivalent resistance R of R1 and R3b：
State one：It is simultaneously switched off in K1, K2, it is U to measure positive and negative busbar voltage-to-groundP1、Un1。
Positive pole equiva lent impedance R over the ground at this timep1For RpWith the parallel equivalent resistance of R1：
Power cathode equiva lent impedance R over the groundn1For RnWith the parallel equivalent resistance of R2：
According toIt can obtain：
Wherein：UP1、Un1For test value, R1, R2 are given value.
State two：In the case where K1 is disconnected and is closed K2 closures, it is U to measure positive and negative busbar voltage-to-groundP2、Un2。
Positive pole equiva lent impedance R over the ground at this timep1For RpWith the parallel equivalent resistance of R1：
Power cathode equiva lent impedance R over the groundn1For RnWith RbParallel equivalent resistance：
According toIt can obtain
Wherein：UP2、Un2For test value, R1, RbFor given value.
State three：In the case where K1 is closed K2 disconnections, it is U to measure positive and negative busbar voltage-to-groundP3、Un3。
Positive pole equiva lent impedance R over the ground at this timep3For RpWith the parallel equivalent resistance of Ra：
Power cathode equiva lent impedance R over the groundn3For RnWith the parallel equivalent resistance of R2：
According toIt can obtain
Wherein：UP3、Un3For test value, R2, RaFor given value.
Formula (5) divided by formula (8) can obtain power cathode ground insulation resistance
Formula (5) divided by formula (11), can obtain positive pole pole ground insulation resistance
In addition it should be noted that the switching of three kinds of states be not present sequencing, each step obtain relevant voltage with
The ratio formula of resistance.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all within the principle of the utility model, institute
Any modification, equivalent substitution, improvement and etc. of work, should be included within the scope of protection of this utility model.
Claims (4)
1. a kind of high-voltage DC power supply ground insulation impedance detection circuit, which is characterized in that including:
The first load that one end is connected with positive pole to be measured, the second load and Y-junction that one end is connected with power cathode to be measured
The resistance handover module of structure, wherein：
The resistance handover module includes three branches, wherein：The first branch includes first switch, and one end is connected to power supply to be measured
Anode；The second branch includes second switch, and one end is connected to power cathode to be measured；Third branch includes resistance, one end ground connection.
2. circuit as described in claim 1, which is characterized in that first load, the described second resistance value value range loaded
For 100K Ω~10M Ω.
3. circuit as described in claim 1, which is characterized in that the resistance value range positioned at third branch road
For 10K Ω~100K Ω.
4. circuit as described in claim 1, which is characterized in that the first switch, the second switch are relay switch, optocoupler
Any one in switch or metal-oxide-semiconductor switch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721462793.4U CN207780205U (en) | 2017-11-06 | 2017-11-06 | A kind of high-voltage DC power supply ground insulation impedance detection circuit |
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| CN201721462793.4U CN207780205U (en) | 2017-11-06 | 2017-11-06 | A kind of high-voltage DC power supply ground insulation impedance detection circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541368A (en) * | 2018-11-08 | 2019-03-29 | 贵阳英纳瑞电气有限公司 | A kind of circuit and detection method for the detection of direct current system bus insulation |
| CN111645490A (en) * | 2020-06-11 | 2020-09-11 | 江苏罗思韦尔电气有限公司 | Automobile air conditioner temperature controller and fault repairing method thereof |
| CN112069755A (en) * | 2020-09-10 | 2020-12-11 | 浪潮商用机器有限公司 | Impedance detection method, system, equipment and storage medium of PCB power supply |
| CN112595895A (en) * | 2020-12-02 | 2021-04-02 | 爱士惟新能源技术(江苏)有限公司 | Insulation impedance detection circuit and method of photovoltaic inverter |
-
2017
- 2017-11-06 CN CN201721462793.4U patent/CN207780205U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541368A (en) * | 2018-11-08 | 2019-03-29 | 贵阳英纳瑞电气有限公司 | A kind of circuit and detection method for the detection of direct current system bus insulation |
| CN111645490A (en) * | 2020-06-11 | 2020-09-11 | 江苏罗思韦尔电气有限公司 | Automobile air conditioner temperature controller and fault repairing method thereof |
| CN111645490B (en) * | 2020-06-11 | 2022-05-24 | 江苏罗思韦尔电气有限公司 | Automobile air conditioner temperature controller and fault repairing method thereof |
| CN112069755A (en) * | 2020-09-10 | 2020-12-11 | 浪潮商用机器有限公司 | Impedance detection method, system, equipment and storage medium of PCB power supply |
| CN112069755B (en) * | 2020-09-10 | 2023-12-29 | 浪潮商用机器有限公司 | Impedance detection method, system, equipment and storage medium of PCB power supply |
| CN112595895A (en) * | 2020-12-02 | 2021-04-02 | 爱士惟新能源技术(江苏)有限公司 | Insulation impedance detection circuit and method of photovoltaic inverter |
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