CN208937682U - Lithium electricity energy storage backup power supply system high-voltage isulation detection circuit - Google Patents
Lithium electricity energy storage backup power supply system high-voltage isulation detection circuit Download PDFInfo
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- CN208937682U CN208937682U CN201821667707.8U CN201821667707U CN208937682U CN 208937682 U CN208937682 U CN 208937682U CN 201821667707 U CN201821667707 U CN 201821667707U CN 208937682 U CN208937682 U CN 208937682U
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Abstract
The utility model provides a kind of lithium electricity energy storage backup power supply system high-voltage isulation detection circuit, comprising: a first node, the first node is connected to low frequency signal emission port by first resistor, low-frequency square-wave signal processing circuit, the first node also passes sequentially through the second capacitor, first capacitor is connected to first switch, and the first switch is standby to connect lithium electricity energy storage；One second node, the second node passes sequentially through low-pass filter unit circuit, over under-voltage protection circuit is linked to AD sample port, is connected between the second node and first node by second resistance, and second node passes through third capacity earth.Realize that the Insulation monitoring under low-pressure state works with this, detection accuracy is high, highly reliable, safety, practical.
Description
Technical field
The utility model relates to a kind of lithium electricity energy storage backup power supply system high-voltage isulation detection circuits.
Background technique
With China's low-carbon, the propulsion of green energy resource strategy, new round power system reform supporting policy is implemented, energy storage
Application value obtained the approval in market, become promote China's energy revolution and Energy restructuring technological highlights, lithium electricity
By gradually substitution conventional lead acid backup power supply system, this is inevitable trend to energy-storage system, and target lithium electricity energy-storage system application field is logical
Believe base station, data center machine room, backup power supply system of electric power website etc., application prospect is boundless.Especially lithium electricity energy-storage system
It is continuously increased used in the conjunction of the high-voltage fields such as photovoltaic energy storage, the effect that various regions electric energy storage is used to peak load shifting is increasing, demand city
Field is also becoming larger, insulation safety of the system voltage all in the even up to upper kilovolt of upper hectovolt, between high-pressure system and surrounding casing
Become particularly critical, concerning life safety is arrived, current customary insulation detection method mainly has High Frequency Injection, current sense
Method, unbalanced electric bridge etc., these detection methods have some distinct disadvantages, specific as follows.
1, High Frequency Injection is that high frequency ac signal is injected into high and low pressure system, is then needed by entire
Behind the circuit of detection, back production is carried out to signal in signal other end, is calculated absolutely by calculating signal amplitude decaying and phase
Edge resistance.This method major defect is to influence the stability of direct current system to a High-frequency Interference source is increased in system, can
It can cause other equipment operation irregularity.Synchronous signal detection is easy to be influenced by distribution capacity in system, influences detection accuracy.
2, amperometr iotac sensing: this method is that branch to be detected is passed through current coupling coil, when there is electric current in circuit,
Coil and couple current calculate insulation resistance resistance value by detection size of current.Party's law limitation is that power supply to be measured is necessary
It is in running order, just the state of insulation of equipment cannot be judged before equipment works.Such case is in high-pressure system
Do not allow.This method is relatively suitble to carry out detection in short supply during the work time.
3, balanced bridge method: bridge method is monitored using electric resistance partial pressure principle, it is believed that system is an electricity to casing
Positive-negative power, is respectively considered an equivalent resistance by resistance to casing, is then waited artificially just over the ground when detecting, is born and increase over the ground
The resistance of one resistance and positive-negative power over the ground forms an electric bridge, calculates positive or negative pole to casing by voltage deviation
Resistance.Party's law limitation is that detection accuracy is relatively low, while detecting and being not allowed when positive and negative busbar insulating resistance simultaneously declines
Really.Also require that high-pressure system works in detection process.
Therefore, for existing issue, it is necessary to a kind of lithium electricity energy storage backup power supply system high-voltage isulation detection circuit is designed, with
It solves the above problems.
Utility model content
The purpose of the utility model is to overcome the defects of the prior art, provide a kind of lithium electricity energy storage backup power supply system high pressure
Insulation detecting circuit, with high reliability, high-precision, the Insulation monitoring of low cost, low pressure detection, safe characteristic.
The utility model is realized in this way: a kind of lithium electricity energy storage backup power supply system high-voltage isulation detection circuit comprising:
One first node, the first node connect tremendously low frequency letter by first resistor, low-frequency square-wave signal processing circuit
Number emission port, the first node also passes sequentially through the second capacitor, first capacitor is connected to first switch, the first switch
It is standby to connect lithium electricity energy storage；
One second node, the second node passes sequentially through low-pass filter unit circuit, over under-voltage protection circuit is linked to
AD sample port, is connected between the second node and first node by second resistance, and second node is connect by third capacitor
Ground.
Further, the standby shell of the first switch connection lithium electricity energy storage.
Further, the first capacitor, the series connection of the second capacitor.
The utility model first disconnects first switch K1, generates low-frequency square-wave signal by CPU, at the end of charging
It waits, acquires third capacitor C3 port voltage size, be denoted as V0.After electric discharge, third capacitor C3 port voltage size, note are acquired
For V1.First switch K1 can be defaulted as the insulation resistance of high pressure and low pressure as infinity after disconnecting.Then by first switch K1
Closure generates low-frequency square-wave signal by CPU, waits at the end of charging, acquires third capacitor C3 port voltage size, be denoted as
V2.After electric discharge, acquire third capacitor C3 port voltage size, be denoted as V3, according to the voltage value of voltage V0, V1, V2, V3 and
Capacitance voltage variation characteristic function, to calculate insulation resistance Rp.
The major advantage of the utility model is:
1, strong antijamming capability: filter circuit can on filtering appts interference (interfered in system substantially all KHz with
On), improve acquisition precision and signal quality.
2, testing precision is high: can when first switch K1 is disconnected calibration measurement system because of environmental factor (temperature,
Humidity etc.) and device decaying and bring measurement error, by calibration, can continue guarantee insulation measurement precision.
3, highly-safe: circuit does not need the work of system high pressure circuit, so that it may fulfil Insulation monitoring ahead of schedule, examine in insulation
After the completion of survey, whether the system that determined according to detection case can go up high-pressure work, the safety before guaranteeing system work.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is lithium electricity energy storage backup power supply system high-voltage isulation detection circuit topological diagram provided by the utility model；
Fig. 2 is low-frequency square-wave signal processing circuit schematic diagram provided by the utility model；
Fig. 3 is low-pass filter unit circuit diagram provided by the utility model；
Fig. 4 is over under-voltage protection circuit schematic diagram provided by the utility model；
Fig. 5 is high-voltage isulation detection signal waveform figure provided by the utility model.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Such as Fig. 1-Fig. 5, the utility model embodiment provides a kind of lithium electricity energy storage backup power supply system high-voltage isulation detection circuit,
It include: a first node 1, the first node 1 is connected to low frequency signal by first resistor, low-frequency square-wave signal processing circuit
Emission port, the first node 1 also passes sequentially through the second capacitor, first capacitor is connected to first switch, the first switch
It is standby to connect lithium electricity energy storage；One second node 2, the second node 2 passes sequentially through low-pass filter unit circuit, overvoltage/undervoltage is protected
Protection circuit is linked to AD sample port, is connected between the second node 2 and first node 1 by second resistance, second node 2
Pass through third capacity earth.The standby shell of the first switch connection lithium electricity energy storage, the first capacitor, the series connection of the second capacitor.
Fig. 1 is illustrated first, first switch K1: the capacitance variation for calibrating C1, C2.First switch K1 is disconnected,
Think high pressure and low-voltage insulation infinite, first capacitor C1, the second electricity are confirmed by detection third capacitor C3 end voltage
Hold influence of the capacitance variation of C2 to loop voltage.Insulation monitoring capacitor includes first capacitor C1, the second capacitor C2: according to first
Capacitor C1, the second capacitor C2 size adjust the voltage swing of charge and discharge, are calculated according to the voltage swing of charge and discharge in the set time
Insulation resistance value size.First resistor R1: it is used to charging current current limliting.Low-frequency square-wave signal processing circuit: for promoting waveform matter
Amount and raising driving capability.Second resistance R2 and third capacitor C3: for carrying out voltage waveform size clamper, guarantee in insulated electro
Voltage waveform when resistance is 0 or is infinity will not reach full state or be discharged within the charge or discharge time
0 state.Promote insulation resistance detection accuracy.Low-pass filter unit circuit: the height generated for other components on filtering appts
Frequency interferes, and the filter cutoff frequency is in 100Hz or following.It is mainly interfered in system all in KHz rank.CPU element: for producing
Raw low-frequency square-wave waveform (Hz level signal), and the voltage value in acquisition Insulation monitoring circuit, calculate absolutely according to voltage condition
The resistance value of edge resistance, which is that cpu control port issues a low-frequency square-wave signal, by signal processing circuit
(be mainly used to improve driving capability and change voltage magnitude), signal pass through first resistor R1 current limliting, then to first capacitor C1,
Second capacitor C2 and third capacitor C3 charge respectively, and when insulation resistance Rp is very big (approximate infinitely great), electric current is substantially all
It is charged to third capacitor C3(and guarantees that third capacitor C3 charging voltage is not more than in charge cycle by second resistance R2
80%, to guarantee the slope of voltage charging in charging process, improve the resolution ratio of insulation resistance Rp detection), then pass through low pass filtered
Wave unit (cutoff frequency near 100Hz, or it is lower, carry out the interference on filtering appts, is interfered in system substantially all in KHz
Or more, to ensure signal quality), after Overvoltage protecting unit, voltage sample is carried out into the port AD of cpu.CPU according to
Collection voltages value calculates the size of insulation resistance Rp.When insulation resistance Rp decline, then first capacitor C1, the second capacitor are charged to
The electric current of C2 becomes more, and the electric current of third capacitor C3 becomes smaller, and the voltage at the end third capacitor C3 becomes smaller within the period, the port AD of CPU
Voltage become smaller, CPU calculates the size of insulation resistance Rp according to voltage swing, and insulation resistance Rp is also referred to as equivalent insulation resistance
Rp, the i.e. insulation performance of lithium electricity energy storage backup power supply system.
Calculating process is as follows:
1, first switch K1 is disconnected, and generating low-frequency square-wave signal by CPU terminates by calculating step above in charging
When, third capacitor C3 port voltage size is acquired, V0 is denoted as.After electric discharge, third capacitor C3 port voltage size is acquired,
It is denoted as V1.First switch K1 can be defaulted as the insulation resistance of high pressure and low pressure as infinity, the port third capacitor C3 after disconnecting
It is shown in solid in voltage such as Fig. 5.The process circuit can be actually used in environmental factor variation, capacitor is using after a long time
The factor of the influences measurement such as Parameters variation all take into account, that the variation of these factors is eventually led to is exactly third capacitor C3 two
The variation for holding voltage, measures out by CPU calculating.
2, first switch K1 is closed, and generating low-frequency square-wave signal by CPU terminates by calculating step above in charging
When, third capacitor C3 port voltage size is acquired, V2 is denoted as.After electric discharge, the 3rd C3 port voltage size is acquired, is denoted as
V3。
3, calculate insulation resistance, CPU according to the voltage value and capacitance voltage variation characteristic function of voltage V0, V1, V2, V3,
To calculate insulation resistance Rp.In the design, signal generation can be substituted directly with signal generating circuit, rather than cpu is used to produce
It is raw.First switch K1 can be relay, or photoelectric switching device etc., AD acquisition can be real using dedicated A/D chip
Existing, the influence of the design thinking is not received in the variation of these titles.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model
Protection scope within.
Claims (3)
1. a kind of lithium electricity energy storage backup power supply system high-voltage isulation detection circuit characterized by comprising
One first node, the first node are connected to low frequency signal by first resistor, low-frequency square-wave signal processing circuit and send out
Penetrate port, the first node also passes sequentially through the second capacitor, first capacitor is connected to first switch, the first switch to
It is standby to connect the energy storage of lithium electricity；
One second node, the second node passes sequentially through low-pass filter unit circuit, over under-voltage protection circuit is linked to AD and adopts
Sample port is connected between the second node and first node by second resistance, and second node passes through third capacity earth.
2. a kind of lithium electricity energy storage backup power supply system high-voltage isulation detection circuit as described in claim 1, it is characterised in that: described the
The standby shell of one switch connection lithium electricity energy storage.
3. a kind of lithium electricity energy storage backup power supply system high-voltage isulation detection circuit as described in claim 1, it is characterised in that: described the
One capacitor, the series connection of the second capacitor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821667707.8U CN208937682U (en) | 2018-10-15 | 2018-10-15 | Lithium electricity energy storage backup power supply system high-voltage isulation detection circuit |
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| CN201821667707.8U CN208937682U (en) | 2018-10-15 | 2018-10-15 | Lithium electricity energy storage backup power supply system high-voltage isulation detection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110187180A (en) * | 2019-06-17 | 2019-08-30 | 杭州神驹科技有限公司 | A kind of detection method of vehicle resistance value |
| CN112285500A (en) * | 2020-10-20 | 2021-01-29 | 深圳英飞源技术有限公司 | Insulation detection circuit and control method thereof |
-
2018
- 2018-10-15 CN CN201821667707.8U patent/CN208937682U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110187180A (en) * | 2019-06-17 | 2019-08-30 | 杭州神驹科技有限公司 | A kind of detection method of vehicle resistance value |
| CN110187180B (en) * | 2019-06-17 | 2022-01-07 | 杭州神驹科技有限公司 | Method for detecting vehicle resistance value |
| CN112285500A (en) * | 2020-10-20 | 2021-01-29 | 深圳英飞源技术有限公司 | Insulation detection circuit and control method thereof |
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