CN209014655U - Insulation detecting circuit and charging pile - Google Patents
Insulation detecting circuit and charging pile Download PDFInfo
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- CN209014655U CN209014655U CN201821582316.6U CN201821582316U CN209014655U CN 209014655 U CN209014655 U CN 209014655U CN 201821582316 U CN201821582316 U CN 201821582316U CN 209014655 U CN209014655 U CN 209014655U
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Abstract
The utility model relates to a kind of insulation detecting circuit and charging pile, which includes: the first adjustable sample circuit, the second adjustable sample circuit, first voltage follower, second voltage follower, difference channel and control device；Wherein, the first adjustable sample circuit is connected to the anode and ground terminal of DC bus；Second adjustable sample circuit is connected to the cathode and ground terminal of DC bus；First voltage follower is connected to the first adjustable sample circuit；Second voltage follower is connected to the second adjustable sample circuit；The first input end of difference channel is connected to the output end of first voltage follower, and second output terminal is connected to the output end of second voltage follower；Control device is respectively connected to the first, second adjustable sample circuit, for adjusting the resistance value of the first, second adjustable sample circuit, the second insulation resistance between the cathode and ground terminal of the first insulation resistance and DC bus between the anode of DC bus and ground terminal is calculated.
Description
Technical field
The utility model relates to electric car charging technique field more particularly to a kind of insulation detecting circuits and charging pile.
Background technique
Current insulation detecting circuit mostly uses balanced bridge method or other methods, regardless of which kind of method is required to exhausted
Switching is carried out in edge detection process, detect data twice and carries out operation, to calculate the insulating resistance value of DC bus.
Therefore it needs to acquire two voltage values that the partial pressure under different conditions obtains respectively to be calculated.And DC bus-bar voltage collection is more
Using directly partial pressure acquisition, therefore only there are two separately independent partial pressure acquisitions for current processing, due to DC charging busbar voltage
It is relatively high, therefore the resistance quantity needed is more, and volume is big, cost is also high, else if merging acquisition of coming for two
If, just during Insulation monitoring, the voltage acquired twice is different, generally requires software to correct, but for voltage acquisition
It cannot achieve in the case where being required to the time.
It follows that how to simplify the workflow of Insulation monitoring, improve the working efficiency of Insulation monitoring, and can reduce at
This, becomes technical problem urgently to be resolved.
Utility model content
Technical problem to be solved by the utility model is to provide a kind of insulation detecting circuit, insulation detecting method and
Charge control method reaches letter by the way that adjustable sample circuit, voltage follower and difference channel are arranged in insulation detecting circuit
The workflow for changing Insulation monitoring, promotes the working efficiency of Insulation monitoring, and reduce the purpose of cost.
In order to solve the above-mentioned technical problem, on the one hand according to the utility model, a kind of insulation detecting circuit is provided, wrapped
Include: the first adjustable sample circuit, the second adjustable sample circuit, first voltage follower, second voltage follower, difference channel and
Control device；Wherein, one end of the first adjustable sample circuit is connected to the anode of DC bus, the first adjustable sample circuit it is another
One end is connected to ground terminal；One end of second adjustable sample circuit is connected to the cathode of DC bus, the second adjustable sample circuit
The other end be connected to ground terminal；The positive input terminal of first voltage follower is connected to the first adjustable sample circuit；Second voltage
The positive input terminal of follower is connected to the second adjustable sample circuit；The first input end of difference channel is connected to first voltage and follows
The output end of device, the second output terminal of difference channel are connected to the output end of second voltage follower；Control device is separately connected
To the first adjustable sample circuit and the second adjustable sample circuit, for adjusting the first adjustable sample circuit and the second adjustable sampling electricity
The resistance value on road, the cathode of the first insulation resistance and DC bus between anode and ground terminal to calculate mainstream power supply with connect
The second insulation resistance between ground terminal.
Further, the first adjustable sample circuit include: first switch and the first sampling resistor being sequentially connected in series,
Second sampling resistor, third sampling resistor and the 4th sampling resistor, wherein one end of first switch is connected to the first sampling resistor
With the junction of the second sampling resistor, the other end of first switch is connected to the connection of third sampling resistor and the 4th sampling resistor
Place；Second adjustable sample circuit include: second switch and the 5th sampling resistor being sequentially connected in series, the 6th sampling resistor,
7th sampling resistor and the 8th sampling resistor, wherein one end connecting pin of second switch is connected to the 5th sampling resistor and the 6th
The junction of sampling resistor, the other end of second switch are connected to the junction of the 7th sampling resistor and the 8th sampling resistor；With
And control device is specifically used for: control changes the open and-shut mode of first switch and the second switch, to adjust the first adjustable sampling electricity
The resistance value on road and the second adjustable sample circuit.
Further, the first sampling resistor, the second sampling resistor, third sampling resistor, the 4th sampling resistor, the 5th sampling
Resistance, the 6th sampling resistor, the 7th sampling resistor and the 8th sampling resistor respectively include one or more resistance, wherein multiple
Resistance is connected and/or is connected in parallel.
Further, the ratio of the resistance value of the first sampling resistor and the resistance value of the 4th sampling resistor is equal to the second sampling resistor
The ratio of resistance value and the resistance value of third sampling resistor；And the 5th sampling resistor resistance value and the 8th sampling resistor the ratio of resistance value etc.
In the ratio of the resistance value of the resistance value and the 7th sampling resistor of the 6th sampling resistor.
Further, the resistance value of the 8th sampling resistor is equal to the resistance value of the first sampling resistor, the resistance value of the 7th sampling resistor
Equal to the resistance value of the second sampling resistor, the resistance value of the 6th sampling resistor is equal to the resistance value of third sampling resistor, the 5th sampling resistor
Resistance value be equal to the 4th sampling resistor resistance value.
Further, when first switch is closed, and second switch disconnects, following formula can be obtained:
When first switch disconnects, and second switch is closed, following formula can be obtained:
R+ and R- are calculated in conjunction with formula (1) and formula (2)；
Wherein, V1a and V1b is the voltage value of the first adjustable sample circuit, and V2a and V2b are the second adjustable sample circuit
Voltage value, R1-R4 are respectively resistance value of first sampling resistor to the 4th sampling resistor, and R+ is the first insulation resistance, R- second
Insulation resistance.
Further, insulation detecting circuit further include: the first current-limiting resistance and the second current-limiting resistance；
Wherein, one end of the first current-limiting resistance is connected to the negative input end of first voltage follower, the first current-limiting resistance
The other end is connected to the output end of first voltage follower；One end of second current-limiting resistance is connected to the negative of second voltage follower
Input terminal, the other end of the second current-limiting resistance are connected to the output end of second voltage follower.
On the other hand according to the utility model, a kind of charging pile, including Insulation monitoring described in any of the above embodiments electricity are provided
Road.
The utility model has clear advantage and beneficial effect compared with prior art.By above-mentioned technical proposal, originally
A kind of insulation detecting circuit of utility model and charging pile can reach comparable technical progress and practicability, and have in industry
Extensive utility value, at least have the advantage that
(1) Insulation monitoring can be carried out by an alignment detection circuit by the way that adjustable sample circuit is arranged, and then can
Save the production cost of insulation detecting circuit.
(2) can be realized by setting voltage follower and difference channel in circuit can during Insulation monitoring
The voltage acquisition of DC bus is carried out, and then improves the working efficiency of Insulation monitoring, while eliminating and using in the prior art
The step of software correction.
The above description is merely an outline of the technical solution of the present invention, in order to better understand the skill of the utility model
Art means, and being implemented in accordance with the contents of the specification, and in order to allow the above and other purpose, feature of the utility model
It can be more clearly understood with advantage, it is special below to lift preferred embodiment, and cooperate attached drawing, detailed description are as follows.
Detailed description of the invention
Fig. 1 is the schematic diagram of an embodiment of the present invention insulation detecting circuit；
Fig. 2 is the flow diagram of an embodiment of the present invention insulation detecting method；
Fig. 3 is the flow diagram of an embodiment of the present invention charge control method；
Fig. 4 is flow diagram of an embodiment of the present invention to the method for being electrically charged equipment progress insulating part.
[symbol description]
U1: the first adjustable sample circuit of adjustable sample circuit U2: the second
U3: first voltage follower U4: second voltage follower
U5: difference channel DC+: the anode of DC bus
DC-: the R1: the first sampling resistor of cathode of DC bus
R2: the second sampling resistor R3: third sampling resistor
R4: the four the R5: the five sampling resistor of sampling resistor
R6: the six the R7: the seven sampling resistor of sampling resistor
R8: the eight sampling electricity the R9: the first current-limiting resistance of group
R10: the second current-limiting resistance S1: first switch
S2: second switch
R+: the insulation resistance between the anode and ground terminal of DC bus
R-: the insulation resistance between the cathode and ground terminal of DC bus
PE: ground terminal
Specific embodiment
Further to illustrate that the utility model is the technical means and efficacy reaching predetermined purpose of utility model and being taken,
Below in conjunction with attached drawing and preferred embodiment, to according to the utility model proposes a kind of insulation detecting circuit, insulation detecting method
And the specific embodiment and its effect of charge control method, detailed description is as follows.
The utility model embodiment provides a kind of insulation detecting circuit, as shown in Figure 1, comprising: the first adjustable sampling electricity
Road U1, the second adjustable sample circuit U2, first voltage follower U3, second voltage follower U4, difference channel U5 and control dress
Set (not shown)；Wherein, one end of the described first adjustable sample circuit U1 is connected to the positive DC+ of DC bus, described
The other end of first adjustable sample circuit U1 is connected to ground terminal PE；One end of the second adjustable sample circuit U2 is connected to institute
The cathode DC- of DC bus is stated, the other end of the second adjustable sample circuit U2 is connected to the ground terminal PE；Described first
The positive input of voltage follower U3 is connected to the described first adjustable sample circuit U1；The second voltage follower U4 is just
The described second adjustable sample circuit U2 is connected to input terminal；The first input end of the difference channel U5 is connected to described first
The output end of voltage follower U3, the second output terminal of the difference channel U5 are connected to the defeated of the second voltage follower U4
Outlet；The control device is respectively connected to the described first adjustable sample circuit U1 and the second adjustable sample circuit U2, uses
In the resistance value for adjusting the first adjustable sample circuit U1 and the second adjustable sample circuit U2, the DC bus is calculated
Anode and ground terminal between the first insulation resistance and the DC bus cathode and ground terminal between the second insulated electro
Resistance.
It will be appreciated that the first adjustable sample circuit U1 and second is adjusted by control device during Insulation monitoring
The resistance value of adjustable sample circuit U2, with the electricity of the adjustable sample circuit U2 of the first adjustable sample circuit U1 and second of variation of resistance value
Pressure value can also change therewith, and the adjustable sample circuit U2 of voltage V1 and second of the adjustable sample circuit U1 of different first can be obtained
Voltage V2, and then insulation resistance is calculated by different V1 and V2, meets and calculate insulation resistance under Insulation monitoring state
Demand.The difference between V1 and V2 is acquired by difference channel U5 simultaneously, the difference by being multiplied by specific coefficient
The voltage value of DC bus.
It is appreciated that the voltage value between DC bus is higher, therefore in insulation detecting circuit during DC charging
First voltage follower U3 and second voltage follower U4 is also provided with for voltage follow, collected V1 and V2 is carried out
Difference channel U5 is sent to after equal proportion decompression.
In one embodiment, as shown in Figure 1, the first adjustable sample circuit U1 may include the first sampling being sequentially connected in series
Resistance R1, the second sampling resistor R2, third sampling resistor R3 and the 4th sampling resistor R4, while being additionally provided with and the second sampling electricity
Hinder R2 and R3 parallel connection of third sampling resistor first switch S1, i.e. one end of first switch S1 be connected to the first sampling resistor R1 with
The junction of second sampling resistor R2, the other end of first switch S1 are connected to third sampling resistor R3 and the 4th sampling resistor R4
Junction；Second adjustable sample circuit U2 may include the 5th sampling resistor R5 being sequentially connected in series, the 6th sampling resistor R6,
Seven sampling resistor R7 and the 8th sampling resistor R8, while being additionally provided in parallel with the 6th sampling resistor R6 and the 7th sampling resistor R7
Second switch S2, i.e. one end of second switch S2 is connected to the junction of the 5th sampling resistor R5 and the 6th sampling resistor R6,
The other end of second switch S2 is connected to the junction of the 7th sampling resistor R7 and the 8th sampling resistor R8.
It is understood that control device is i.e. changeable by the open and-shut mode of control first switch S1 and second switch S2
The resistance value of the first adjustable adjustable sample circuit U2 of sample circuit U1 and second, and then realize and change the first adjustable sample circuit U1's
The purpose of the voltage V2 of voltage V1 and second is adjustable sample circuit U2.
Certainly, according to the actual situation, the first sampling resistor R1 to the 8th sampling resistor R8 may include one or more respectively
A resistance, it is plurality of to connect and/or be connected in parallel, the requirement of circuit design is reached with this.
In one embodiment, the resistance value of the first sampling resistor R1 to the 8th sampling resistor R8 can be set are as follows: first
Resistance value and third of the ratio of the resistance value of sampling resistor R1 and the resistance value of the 4th sampling resistor R4 equal to the second sampling resistor R2 sample
The ratio of the resistance value of resistance R3, the ratio of the resistance value of the resistance value and the 8th sampling resistor R8 of the 5th sampling resistor R5 are equal to the 6th sampling electricity
Hinder the ratio of the resistance value of R6 and the resistance value of the 7th sampling resistor R7, i.e. R1/R4=R2/R3, R5/R8=R6/R7.
Set by the above-mentioned resistance value to the first sampling resistor R1 to the 8th sampling resistor R8, can in first switch S1 and
Second switch S2 different closures and opening state, the voltage value between V1 and V2 will not change, and then in difference channel
The value that U5 carries out difference sampling will not change, and the voltage value V3 of DC bus that sampling obtains will not change, and protect
The accuracy of collected d-c bus voltage value V3 is demonstrate,proved.
In one embodiment, the insulated electro between the positive DC+ and ground terminal PE of DC bus out for ease of calculation
The insulation resistance R- between R+ and cathode DC- and ground terminal PE is hindered, the first sampling resistor R1 to the 8th is further sampled into electricity
Hinder the resistance value setting of R8 are as follows: the resistance value of the 8th sampling resistor R8 is equal to the resistance value of the first sampling resistor R1, the 7th sampling resistor R7
Resistance value be equal to the resistance value of the second sampling resistor R2, the resistance value of the 6th sampling resistor R6 is equal to the resistance value of third sampling resistor R3,
The resistance value of 5th sampling resistor R5 is equal to the resistance value of the 4th sampling resistor R4, i.e. R1=R8, R2=R7, R3=R6, R4=R5.
It is set by the above-mentioned resistance value to the first sampling resistor R1 to the 8th sampling resistor R8, when carrying out Insulation monitoring,
When control is closed first switch S1, it is known that be that the second sampling resistor R2 and third sampling resistor R3 are short-circuited, simultaneously switch off the
Two switch S2, set the voltage value of V1 at this time as V1a, the voltage of V2 most V2a, then available following formula:
When control be closed second switch S2, it is known that be that the 6th sampling resistor R6 and the 7th sampling resistor R7 are short-circuited, together
When disconnect first switch S1, set the voltage value of V1 at this time as V1b, the voltage of V2 most V2b, then available following public affairs
Formula:
The value of R+ and R- can be calculated further combined with formula (1) and formula (2).
In one embodiment, the first current limliting is connected between the negative input end and output end of first voltage follower U3
Resistance R9 is connected with the second current-limiting resistance R10 between the negative input end and output end of second voltage follower U4, is prevented with this
The only excessive damage to component in circuit of electric current during Insulation monitoring.
It in one embodiment, can also be by manually controlling or other control modes realize first switch S1 and second
The control of switch S2 open and-shut mode.
The utility model embodiment additionally provides a kind of insulation detecting method, and this method is for described in any of the above embodiments exhausted
Edge detection circuit, as shown in Fig. 2, the detection method includes:
Step S201 adjusts the resistance value of the first adjustable sample circuit and the second adjustable sample circuit, calculates the first insulation
Resistance and the second insulation resistance.
Specifically, the resistance value of the first adjustable sample circuit and the second adjustable sample circuit is adjusted, and calculates DC bus
Anode and ground terminal between the first insulation resistance and DC bus cathode and ground terminal between the second insulation resistance.
Further, the first of the insulation detecting circuit the adjustable sample circuit includes first switch and is sequentially connected in series
First sampling resistor, the second sampling resistor, third sampling resistor and the 4th sampling resistor, the second adjustable sample circuit include second
The 5th sampling resistor, the 6th sampling resistor, the 7th sampling resistor and the 8th sampling resistor for switching and being sequentially connected in series.
Specifically, control changes the open and-shut mode of the first switch and the second switch in insulation detecting circuit, calculate straight
Flow insulation resistance (i.e. first insulation resistance) of the bus just between ground terminal and between DC bus negative pole end and ground terminal
Insulation resistance (i.e. the second insulation resistance).
In a specific embodiment, control closure first switch, it is known that be the second sampling resistor and third sampling electricity
Resistance is short-circuited, and simultaneously switches off second switch, then available following formula:
When control be closed second switch, it is known that be that the 6th sampling resistor and the 7th sampling resistor are short-circuited, simultaneously switch off
First switch, then available following formula:
The value of R+ and R- can be calculated further combined with formula (1) and formula (2), wherein V1a and V1b is described the
The voltage value of one sampling bleeder circuit, V2a and V2b are the voltage value of the second sampling bleeder circuit, and R1-R4 is respectively first
Sampling resistor is to the resistance value of the 4th sampling resistor, and R+ is the insulation resistance of the DC bus anode and the ground terminal, and R- is
Insulation resistance between the DC bus cathode and ground terminal.
First insulation resistance and the second insulation resistance are compared, to sentence by step S202 with default insulation resistance threshold value
Make the state of insulation of DC bus.
Specifically, calculated first insulation resistance and the second insulation resistance and default insulation resistance threshold value are carried out respectively
Compare, determines between the anode of DC bus and ground terminal state of insulation and DC bus cathode according to comparison result and connect
State of insulation between ground terminal.
It in a specific embodiment, include insulation resistance threshold value Rx (i.e. first in the default insulation resistance threshold value of setting
Insulation resistance threshold value) and insulation resistance threshold value Ry (i.e. the second insulation resistance threshold value), wherein Ry > Rx.Certainly, this can basis
Actual conditions most insulation resistance threshold value carries out other settings.
Table 1
As shown in table 1, as R+ > Ry, then it can determine that and insulate normally between the anode of DC bus and ground terminal；
As Ry > R+ > Rx, then it can determine that SI semi-insulation fails between the anode of DC bus and ground terminal；
As R+ < Rx, then it can determine that failure of insulation between the anode of DC bus and ground terminal.
Similarly, as R- > Ry, then it can determine that and insulate normally between the cathode of DC bus and ground terminal；
As Ry > R- > Rx, then it can determine that SI semi-insulation fails between the cathode of DC bus and ground terminal；
As R- < Rx, then it can determine that failure of insulation between the cathode of DC bus and ground terminal.
Further, according to above-mentioned judgement, you can get it, when at least one in R+ and R- is less than Rx, that is, works as DC bus
Anode and the insulation situation of ground terminal and the insulation situation of cathode and ground terminal in when having a failure of insulation, that is, can determine that directly
Flow bus insulation failure；When at least one in R+ and R- is greater than Rx and is less than Ry, and R+ and R- are not less than Rx, that is, work as direct current
There is SI semi-insulation failure and separately in the anode of bus and the insulation situation of ground terminal and the insulation situation of cathode and ground terminal
When one non-failure of insulation, that is, it can determine that DC bus sections failure of insulation；When R+ and R- are all larger than Ry, i.e., when direct current is female
When the insulation situation of the anode of line and the insulation situation and cathode of ground terminal and ground terminal is that insulation is normal, that is, it can determine that direct current
Bus insulation is normal.
The utility model embodiment also provides a kind of charge control method, is used for Insulation monitoring side described in any of the above embodiments
Method, as shown in Figure 3, comprising the following steps:
Step 301, Insulation monitoring is carried out to charging equipment before preparing charging, to obtain the first insulation shape of charging equipment
State.
Specifically, it in charging equipment to being electrically charged before equipment charged, in order to guarantee the safety of charging, needs to filling
Electric equipment carries out Insulation monitoring, to obtain the current state of insulation of charging equipment (i.e. the first state of insulation), because Insulation monitoring is adopted
With above-mentioned insulation detecting method, therefore details are not described herein again.
Step 302, determine whether that controlling charging equipment is to be electrically charged equipment charge according to the first state of insulation.
In one embodiment, when the state of insulation (i.e. the first state of insulation) for detecting charging equipment by Insulation monitoring
When to insulate normal, then controlling charging equipment is to be electrically charged equipment to charge.
In this embodiment, it when the state of insulation for detecting charging equipment is SI semi-insulation failure, still controls charging and sets
It is standby to charge to be electrically charged equipment, of course for staff can be reminded to understand current insulation status, it can control hair
Standby signal out, the standby signal can be sound and light alarm signal, can also be set by mobile phone to staff or computer etc.
Preparation send current state of insulation information, can also remind staff using other modes certainly.
In this embodiment, when the state of insulation for detecting charging equipment is failure of insulation, then forbid charging equipment pair
It is electrically charged equipment to charge, to guarantee personal and property safety.It is current exhausted of course for staff can be reminded to understand
Edge situation, and processing can be timely repaired, it can control sending standby signal, which can be sound-light alarm
Signal can also send current state of insulation information by mobile phone to staff or apparatus such as computer, certainly can be with
Staff is reminded using other modes.
According to above-described embodiment, after controlling charging equipment is to be electrically charged equipment to start to charge, then execute such as Fig. 4 institute
The process step stated, comprising:
Step S401 carries out Insulation monitoring to the equipment that is electrically charged, to obtain the second state of insulation for being electrically charged equipment.
It will be appreciated that during charging equipment is to be electrically charged equipment and charged, charging equipment is set with being electrically charged
It is electrically connected between standby, therefore when to equipment progress Insulation monitoring is electrically charged, actually while to charging equipment and being electrically charged equipment
Insulation monitoring is carried out.
Step S402, when detecting the second state of insulation is failure of insulation, it is to be electrically charged to set that control, which stops charging equipment,
Standby charging.
It will be appreciated that when being to be electrically charged equipment after detecting failure of insulation, answer in charging process in charging equipment
When the output for cutting off charging equipment immediately, to guarantee the safety of the person and property.
Step S403, control the charging equipment stop for it is described be electrically charged equipment charge after, set again to being electrically charged
It is standby to carry out Insulation monitoring, to obtain the third state of insulation for being electrically charged equipment.
It will be appreciated that charging equipment and being electrically charged between equipment during charging equipment is to be electrically charged equipment charge
Electrical connection, therefore when detecting failure of insulation, the position of failure of insulation can not be determined, it is therefore desirable to after stopping charging
Insulation monitoring is carried out again.
Step S404 determines charging equipment and the insulation situation for being electrically charged equipment according to third state of insulation.
In a specific embodiment, when control charging equipment stops detecting that third is exhausted to after being electrically charged equipment charge
Edge state is that then can be determined that the position of failure of insulation is charging equipment when insulating normal；When the third state of insulation detected
When failing for failure of insulation or SI semi-insulation, then explanation is to be electrically charged apparatus insulated failure or SI semi-insulation failure or charge
Equipment and be electrically charged the equal failure of insulation of equipment or SI semi-insulation failure.
The utility model embodiment also provides a kind of controller comprising memory and processor, the memory storage
There is computer program, described program can be realized a kind of step of charging pile control method when being executed by the processor
Suddenly.
The utility model embodiment also provides a kind of computer readable storage medium, described for storing computer program
The step of program realizes the charge control method when by a computer or processor execution.
In one embodiment of the utility model, charging equipment is preferably charging pile, is electrically charged equipment and is preferably
Electric car.
The insulation detecting circuit of the utility model embodiment can be by examining by the way that adjustable sample circuit is arranged all the way
Slowdown monitoring circuit carries out Insulation monitoring, and then can save the production cost of insulation detecting circuit.By be arranged in circuit voltage with
Can be realized with device and difference channel can carry out the voltage acquisition of DC bus during Insulation monitoring, and then improve
The working efficiency of Insulation monitoring, while the step of eliminating in the prior art using software correction.
The charge control method of the utility model embodiment carries out Insulation monitoring to charging equipment before being charged,
And control whether to charge according to testing result, to guarantee the safety for being electrically charged equipment.Simultaneously during the charging process, exhausted when detecting
After edge failure, the equipment for determining failure of insulation by carrying out Insulation monitoring again, so that staff can be accurate
Malfunction elimination and maintenance quickly are carried out to the equipment of failure of insulation, effectively improve working efficiency.
The above descriptions are merely preferred embodiments of the present invention, not makees in any form to the utility model
Limitation be not intended to limit the utility model although the utility model has been disclosed with preferred embodiment as above, it is any ripe
Professional and technical personnel is known, is not being departed within the scope of technical solutions of the utility model, when in the technology using the disclosure above
Hold the equivalent embodiment made a little change or be modified to equivalent variations, but all without departing from technical solutions of the utility model
Hold, any simple modification, equivalent change and modification made by the above technical examples according to the technical essence of the present invention, still
It is within the scope of the technical solutions of the present invention.
Claims (8)
1. a kind of insulation detecting circuit characterized by comprising the first adjustable sample circuit, the second adjustable sample circuit, first
Voltage follower, second voltage follower, difference channel and control device；
Wherein, one end of the described first adjustable sample circuit is connected to the anode of DC bus, the first adjustable sample circuit
The other end be connected to ground terminal；
One end of the second adjustable sample circuit is connected to the cathode of the DC bus, the second adjustable sample circuit
The other end is connected to the ground terminal；
The positive input terminal of the first voltage follower is connected to the described first adjustable sample circuit；
The positive input terminal of the second voltage follower is connected to the described second adjustable sample circuit；
The first input end of the difference channel is connected to the output end of the first voltage follower, and the of the difference channel
Two output ends are connected to the output end of the second voltage follower；
The control device is respectively connected to the described first adjustable sample circuit and the second adjustable sample circuit, for adjusting
The resistance value of the first adjustable sample circuit and the second adjustable sample circuit, with calculate the DC bus anode with
The first insulation resistance between ground terminal and the second insulation resistance between the cathode and ground terminal of the DC bus.
2. insulation detecting circuit according to claim 1, which is characterized in that the first adjustable sample circuit includes:
One switch and the first sampling resistor, the second sampling resistor, third sampling resistor and the 4th sampling resistor being sequentially connected in series,
Wherein, one end of the first switch is connected to the junction of first sampling resistor and second sampling resistor, described
The other end of first switch is connected to the junction of the third sampling resistor and the 4th sampling resistor；
The second adjustable sample circuit includes: second switch and the 5th sampling resistor being sequentially connected in series, the 6th sampling
Resistance, the 7th sampling resistor and the 8th sampling resistor, wherein one end connecting pin of the second switch is connected to the described 5th and adopts
The junction of sample resistance and the 6th sampling resistor, the other end of the second switch are connected to the 7th sampling resistor and the 8th
The junction of sampling resistor；And
The control device is respectively connected to the first switch and the second switch, changes the first switch for controlling
With the open and-shut mode of the second switch, to adjust the resistance of the described first adjustable sample circuit and the second adjustable sample circuit
Value.
3. insulation detecting circuit according to claim 2, which is characterized in that first sampling resistor, the second sampling electricity
Resistance, third sampling resistor, the 4th sampling resistor, the 5th sampling resistor, the 6th sampling resistor, the 7th sampling resistor and the 8th sampling
Resistance respectively includes one or more resistance, wherein the multiple resistance is connected and/or is connected in parallel.
4. insulation detecting circuit according to claim 3, which is characterized in that the resistance value of first sampling resistor with it is described
The ratio of the resistance value of 4th sampling resistor is equal to the ratio of the resistance value of second sampling resistor and the resistance value of the third sampling resistor；
And
The ratio of the resistance value of the resistance value and the 8th sampling resistor of 5th sampling resistor is equal to the 6th sampling resistor
The ratio of resistance value and the resistance value of the 7th sampling resistor.
5. insulation detecting circuit according to claim 4, which is characterized in that the resistance value of the 8th sampling resistor is equal to institute
State the resistance value of the first sampling resistor, the resistance value of the 7th sampling resistor is equal to the resistance value of second sampling resistor, and described the
The resistance value of six sampling resistors is equal to the resistance value of the third sampling resistor, and the resistance value of the 5th sampling resistor is equal to the described 4th
The resistance value of sampling resistor.
6. insulation detecting circuit according to claim 5, which is characterized in that when the first switch be closed, described second
When switch disconnects, following formula can be obtained:
When the first switch disconnects, and the second switch is closed, following formula can be obtained:
R+ and R- are calculated in conjunction with formula (1) and formula (2)；
Wherein, V1a and V1b is the voltage value of the described first adjustable sample circuit, and V2a and V2b are the described second adjustable sampling electricity
The voltage value on road, R1-R4 are respectively resistance value of first sampling resistor to the 4th sampling resistor, and R+ is first insulation resistance,
R- is second insulation resistance.
7. insulation detecting circuit according to claim 1 to 6, which is characterized in that further include: the first current limliting electricity
Resistance and the second current-limiting resistance；
Wherein, one end of first current-limiting resistance is connected to the negative input end of the first voltage follower, first limit
The other end of leakage resistance is connected to the output end of the first voltage follower；
One end of second current-limiting resistance is connected to the negative input end of the second voltage follower, second current-limiting resistance
The other end be connected to the output end of the second voltage follower.
8. a kind of charging pile, which is characterized in that including insulation detecting circuit such as of any of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821582316.6U CN209014655U (en) | 2018-09-27 | 2018-09-27 | Insulation detecting circuit and charging pile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111812474A (en) * | 2020-08-12 | 2020-10-23 | 南京能瑞自动化设备股份有限公司 | Insulation detection circuit, system and method for DC charging pile |
| CN112285499A (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
- 2018-09-27 CN CN201821582316.6U patent/CN209014655U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111812474A (en) * | 2020-08-12 | 2020-10-23 | 南京能瑞自动化设备股份有限公司 | Insulation detection circuit, system and method for DC charging pile |
| CN112285499A (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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