CN108196171A - Insulation detection device - Google Patents
Insulation detection device Download PDFInfo
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- CN108196171A CN108196171A CN201810070171.XA CN201810070171A CN108196171A CN 108196171 A CN108196171 A CN 108196171A CN 201810070171 A CN201810070171 A CN 201810070171A CN 108196171 A CN108196171 A CN 108196171A
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- partial pressure
- pressure unit
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- operational amplifier
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention relates to a kind of insulation detection devices.Including the first partial pressure unit of anode, positive switch, the second partial pressure unit of anode, the first partial pressure unit of cathode, negative switch, the second partial pressure unit of cathode and controller；Anode, the first partial pressure unit of anode and the positive switch of external power supply are sequentially connected, and the first end of positive switch and controller respectively with the second partial pressure unit of anode is connect, the second end ground connection of the second partial pressure unit of anode；The connection of cathode portion is connect unanimously with anode portion.When controller control positive switch is closed, external power supply, the first partial pressure unit of anode and the second partial pressure unit of anode forming circuit obtain first voltage equation；When controller control negative switch is closed, external power supply, the first partial pressure unit of cathode, the second partial pressure unit of cathode forming circuit obtain second voltage equation；External power supply anode insulation against ground resistance and cathode insulation against ground resistance are obtained by first voltage equation and second voltage equation.
Description
Technical field
The present invention relates to electronic measuring technology field, more particularly to a kind of insulation detection device.
Background technology
With the rapid development of New-energy electric vehicle, battery voltage is also higher and higher on electric vehicle.Electric vehicle
High-pressure system dc bus can reduce the insulation characterisitic of car body due to the other factors such as vibrating, impacting, and insulation characterisitic
Reduction can lead to the accidents such as personnel's electric shock and equipment damage, therefore, to the insulating properties between high-pressure system dc bus and car body
It can be detected and monitor and is necessary.
High-voltage direct current insulation detecting method mainly includes direct current method and alternating current method, wherein, direct current method includes balance electricity
Bridge Insulation monitoring and unbalanced bridge Insulation monitoring, alternating current method are mainly small-signal injection method, but such insulation detecting method
Accuracy in detection is not high or even will appear erroneous judgement.
Invention content
Based on this, it is necessary in view of the above-mentioned problems, providing a kind of insulation detection device for improving accuracy in detection.
A kind of insulation detection device, including the first partial pressure unit of anode, positive switch, the second partial pressure unit of anode, cathode
First partial pressure unit, negative switch, the second partial pressure unit of cathode and controller；
The anode of external power supply is connect with the first partial pressure unit of anode, and the first partial pressure unit of anode is connect with positive switch,
Positive switch is connect with the first end of the second partial pressure unit of anode, the second end ground connection of the second partial pressure unit of anode, anode second
The first end of partial pressure unit is connect with controller；The cathode of external power supply is connect with the first partial pressure unit of cathode, and cathode first divides
Pressure unit is connect with negative switch, and negative switch is connect with the first end of the second partial pressure unit of cathode, the second partial pressure unit of cathode
Second end ground connection, the first end of the second partial pressure unit of cathode connect with controller；Controller respectively with the control of positive switch
The connection of the control terminal of end and negative switch；
When controller control positive switch is closed, external power supply, the first partial pressure unit of anode and anode second divide
Unit is formed into a loop, and obtains first voltage equation；When controller control negative switch is closed, external power supply, cathode first divides
Unit, the second partial pressure unit of cathode forming circuit are pressed, obtains second voltage equation；By first voltage equation and second voltage side
Cheng Lianhe is solved, and obtains the resistance value of external power supply anode insulation against ground resistance and the resistance value of cathode insulation against ground resistance.
Above-mentioned insulation detection device, when controller control positive switch is closed, external power supply, the first partial pressure unit of anode
And the second partial pressure unit of anode forms an anode circuit, can obtain the anode circuit according to Ohm's law includes anode pair
The first voltage equation of ground insulation resistance, cathode insulation against ground resistance and anode the second partial pressure unit voltage；When controller controls
When negative switch is closed, external power supply, the first partial pressure unit of cathode, the second partial pressure unit of cathode form a negative loop, root
The negative loop can be obtained according to Ohm's law including anode insulation against ground resistance, cathode insulation against ground resistance and cathode second to divide
Press the second voltage equation of cell voltage；The second voltage equation of the first voltage equation in anode circuit and negative loop is joined
It closes and solves, since anode the second partial pressure unit voltage and cathode the second partial pressure unit voltage have acquired, therefore two equation solutions two
A unknown parameter can obtain the resistance value of anode insulation against ground resistance and the resistance value of cathode insulation against ground resistance, based on anode pair
Ground insulation resistance resistance value and cathode insulation against ground resistance can determine whether insulation performance, and such insulation detection device can be effective
Improve the accuracy of Insulation monitoring.
In one embodiment, insulation detection device further includes filter circuit, and filter circuit divides respectively with anode second
Unit and the second partial pressure unit of cathode are in parallel.
In one embodiment, insulation detection device further includes positive signal processing circuit, the second partial pressure unit of anode
First end is connect by positive signal processing circuit with controller.
In one embodiment, positive signal processing circuit includes operational amplifier, operation amplifier in insulation detection device
Device includes in-phase input end, inverting input and output terminal, and in-phase input end and the anode second of operational amplifier divide list
The output terminal of the first end connection of member, the inverting input of operational amplifier and operational amplifier connects, operational amplifier it is defeated
Outlet is connect with controller.
In one embodiment, positive signal processing circuit further includes diode, operational amplifier in insulation detection device
In-phase input end connect by diode with the first end of the second partial pressure unit of anode.
In one embodiment, positive signal processing circuit further includes resistance and capacitance in insulation detection device, and operation is put
The output terminal of big device is connect by the one end of resistance respectively with controller and capacitance, the other end ground connection of capacitance.
In one embodiment, insulation detection device further includes negative signal processing circuit, the second partial pressure unit of cathode
First end is connect by negative signal processing circuit with controller.
In one embodiment, negative signal processing circuit includes the first operational amplifier and the in insulation detection device
Two operational amplifiers, the first operational amplifier include in-phase input end, inverting input and output terminal, second operational amplifier
Including in-phase input end, inverting input and output terminal, in-phase input end and the cathode second of the first operational amplifier divide
The first end connection of unit, the inverting input of the first operational amplifier are connect with the output terminal of the first operational amplifier, and first
The output terminal of operational amplifier and the inverting input of second operational amplifier connect, the inverting input of second operational amplifier
It is connect with the output terminal of second operational amplifier, the output terminal of second operational amplifier is connect with controller, the second operation amplifier
The in-phase input end ground connection of device.
In one embodiment, negative signal processing circuit further includes current-limiting resistance, the first operation in insulation detection device
The output terminal of amplifier is connected by current-limiting resistance and the inverting input of second operational amplifier.
In one embodiment, negative signal processing circuit further includes feedback resistance, the second operation in insulation detection device
The inverting input of amplifier is connected by feedback resistance and the output terminal of second operational amplifier.
Description of the drawings
Fig. 1 is the structure diagram of insulation detection device in one embodiment；
Fig. 2 is the structure diagram of insulation detection device in another embodiment；
Fig. 3 is the circuit diagram of insulation detection device in one embodiment；
Fig. 4 is the circuit diagram of positive signal processing circuit in insulation detection device in one embodiment；
Fig. 5 is the circuit diagram of negative signal processing circuit in insulation detection device in one embodiment.
Specific embodiment
As shown in Figure 1, a kind of insulation detection device, including controller 100, the first partial pressure unit of anode 200, positive switch
300th, the second partial pressure unit of anode 400, the second partial pressure unit of the first partial pressure unit of cathode 500, negative switch 600 and cathode
700；
The anode of external power supply is connect with the first partial pressure unit of anode 200, the first partial pressure unit of anode 200 and positive switch
300 connections, positive switch 300 connect with the first end of the second partial pressure unit of anode 400, and the of the second partial pressure unit of anode 400
Two ends are grounded, and the first end of the second partial pressure unit of anode 400 is connect with controller 100；The cathode of external power supply and cathode first
Partial pressure unit 500 connects, and the first partial pressure unit of cathode 500 is connect with negative switch 600, and negative switch 600 is divided with cathode second
Press the first end connection of unit 700, the second end ground connection of the second partial pressure unit of cathode 700, the of the second partial pressure unit of cathode 700
One end is connect with controller 100；Controller 100 respectively with the control terminal of positive switch 300 and the control terminal of negative switch 600
Connection；
When controller 100 controls positive switch 300 to be closed, external power supply, the first partial pressure unit of anode 200 and anode
Second partial pressure unit 400 is formed into a loop, and obtains first voltage equation；When controller 100 controls negative switch 600 to be closed, outside
Portion's power supply, the first partial pressure unit of cathode 500, the second partial pressure unit of cathode 700 are formed into a loop, and obtain second voltage equation；By
One voltage equation and second voltage equation joint solve, and obtain the resistance value and cathode pair of external power supply anode insulation against ground resistance
The resistance value of ground insulation resistance.
The on, off of positive switch 300 and negative switch 600 is controlled by controller 100, when positive switch 300
During closure, external power supply, the first partial pressure unit of anode 200 and the second partial pressure unit of anode 400 are formed into a loop, and pass through anode
One partial pressure unit 200, the second partial pressure unit of anode 400, external power supply anode insulation against ground resistance and external power supply cathode pair
Ground insulation resistance divides external power supply, the Voltage Feedback that the second partial pressure unit of acquisition anode 400 is divided to controller.When
When negative switch 600 is closed, external power supply, the first partial pressure unit of cathode 500 and the second partial pressure unit of cathode 700 are formed back
Road passes through the first partial pressure unit of cathode 500, the second partial pressure unit of cathode 700, external power supply anode insulation against ground resistance and outer
Portion's power cathode insulation against ground resistance divides external power supply, and the voltage that the second partial pressure unit of acquisition cathode 400 is divided is anti-
It is fed to controller.When positive switch 300 is closed, the first voltage equation in a circuit can be obtained according to Ohm's law, it should
Equation includes external power supply anode insulation against ground resistance, the second partial pressure unit of external power supply cathode insulation against ground resistance and anode
400 points voltage；When negative switch 600 is closed, the second voltage equation in a circuit can be obtained according to Ohm's law,
The equation divides list including external power supply anode insulation against ground resistance, external power supply cathode insulation against ground resistance and cathode second
Member 700 points voltage, combine the two equations, the voltage and cathode second divided due to the second partial pressure unit of anode 400
Voltage that partial pressure unit 700 is divided to it is known that can solve obtain two known variables external power supply anode insulation against ground resistance and
The resistance value of external power supply cathode insulation against ground resistance.
Above-mentioned insulation detection device, when controller 100 controls positive switch 300 to be closed, external power supply, anode first divides
Unit 200 and the second partial pressure unit of anode 400 is pressed to form an anode circuit, can obtain the anode according to Ohm's law returns
Road includes the first electricity of external power supply anode insulation against ground resistance, cathode insulation against ground resistance and anode the second partial pressure unit voltage
Press equation；When controller 100 controls negative switch 600 to be closed, external power supply, the first partial pressure unit of cathode 500, cathode second
Partial pressure unit 700 forms a negative loop, and can obtain the negative loop according to Ohm's law includes external power supply anode pair
The second voltage equation of ground insulation resistance, external power supply cathode insulation against ground resistance and cathode the second partial pressure unit voltage.It will just
The first voltage equation in pole circuit and the second voltage equation joint of negative loop solve, due to the second partial pressure unit of anode electricity
Pressure and cathode the second partial pressure unit voltage have acquired, therefore two equation solutions, two unknown parameters, can obtain external power supply just
The resistance value of pole insulation against ground resistance and the resistance value of external power supply cathode insulation against ground resistance, based on external power supply anode insulation against ground
Resistance and external power supply cathode insulation against ground resistance can determine whether insulation performance, and such insulation detection device can have
Effect improves the accuracy of Insulation monitoring.
In one embodiment, insulation detection device further includes filter circuit, and filter circuit divides respectively with anode second
Unit and the second partial pressure unit of cathode are in parallel, and filter circuit is used to stablizing the voltage that the second partial pressure unit of anode gets and negative
The voltage that the second partial pressure unit of pole is got.Specifically, filter circuit can include filter capacitor, and the effect of filter capacitor is to make filter
The voltage exported after wave is stable voltage, the capacitor charging when voltage is higher than capacitance voltage, when voltage is less than capacitance voltage
Capacitance discharges, and during charge and discharge, the voltage for making output is basicly stable.
In one embodiment, insulation detection device further includes positive signal processing circuit, the second partial pressure unit of anode
First end is connect by positive signal processing circuit with controller, and positive signal processing circuit gets the second partial pressure unit of anode
Voltage carry out signal processing after, the voltage signal that forming stable controller can identify safely feeds back to controller.
In one embodiment, positive signal processing circuit includes operational amplifier, operation amplifier in insulation detection device
Device includes in-phase input end, inverting input and output terminal, and in-phase input end and the anode second of operational amplifier divide list
The output terminal of the first end connection of member, the inverting input of operational amplifier and operational amplifier connects, operational amplifier it is defeated
Outlet is connect with controller.Operational amplifier as voltage follower, have to the voltage that the second partial pressure unit of anode is got every
From effect, existing interference problem when avoiding the controller from directly acquiring the voltage that the second partial pressure unit of anode is got.
In one embodiment, positive signal processing circuit further includes diode, operational amplifier in insulation detection device
In-phase input end connect by diode with the first end of the second partial pressure unit of anode, diode have anode second is divided
The voltage clamping protective effect that unit is got.
In one embodiment, positive signal processing circuit further includes resistance and capacitance in insulation detection device, and operation is put
The output terminal of big device is connect by the one end of resistance respectively with controller and capacitance, and the other end ground connection of capacitance has in this way
Low-pass filtering acts on.
In one embodiment, insulation detection device further includes negative signal processing circuit, the second partial pressure unit of cathode
First end is connect by negative signal processing circuit with controller, and negative signal processing circuit gets the second partial pressure unit of cathode
Voltage carry out signal processing after, the voltage signal that forming stable controller can identify safely feeds back to controller.
In one embodiment, negative signal processing circuit includes the first operational amplifier and the in insulation detection device
Two operational amplifiers, the first operational amplifier include in-phase input end, inverting input and output terminal, second operational amplifier
Including in-phase input end, inverting input and output terminal, in-phase input end and the cathode second of the first operational amplifier divide
The first end connection of unit, the inverting input of the first operational amplifier are connect with the output terminal of the first operational amplifier, and first
The output terminal of operational amplifier and the inverting input of second operational amplifier connect, the inverting input of second operational amplifier
It is connect with the output terminal of second operational amplifier, the output terminal of second operational amplifier is connect with controller, the second operation amplifier
The in-phase input end ground connection of device.First operational amplifier is as voltage follower, the voltage got to the second partial pressure unit of cathode
With buffer action, existing interference problem when avoiding the controller from directly acquiring the voltage that the second partial pressure unit of cathode is got.The
Two operational amplifiers are as phase inverter, since the voltage signal that the second partial pressure unit of cathode is got is negative pressure signal, by second
Negative pressure signal is become positive pressure signal by the inverting function of operational amplifier, so as to controller subsequent analysis operation.
In one embodiment, negative signal processing circuit further includes current-limiting resistance, the first operation in insulation detection device
The output terminal of amplifier is connected by current-limiting resistance and the inverting input of second operational amplifier, and current-limiting resistance is series at circuit
In, for limiting the size of electric current, to prevent electric current is excessive from burning out the component connected in circuit, while current-limiting resistance also can
Play partial pressure.
In one embodiment, negative signal processing circuit further includes feedback resistance, the second operation in insulation detection device
The inverting input of amplifier is connected by feedback resistance and the output terminal of second operational amplifier, can be set by feedback resistance
Closed-loop dynamic range, and bandwidth and stability are influenced simultaneously.The setting of feedback resistance can make circuit have very high slew rate and
BREATHABLE BANDWIDTH makes the large signal bandwidth of device be in close proximity to small signal bandwidth, and due to the intrinsic linearity, the big letter of high frequency
Number when can also obtain low distortion.The closed loop characteristic of feedback resistance can pass through to avoid the limitation of fixed gain bandwidth
The resistance value of feedback resistance is reduced to realize, circuit high-gain can be kept while gain is improved in this way.
In one embodiment, a kind of insulation detection device includes control module, insulation monitoring module and signal processing
Module, as shown in Fig. 2, control module includes controller 100, insulation monitoring module includes the first partial pressure unit of anode 200, anode
Switch 300, the second partial pressure unit of anode 400, the first partial pressure unit of cathode 500, negative switch 600 and cathode second divide list
Member 700, signal processing module include positive signal processing circuit 800 and negative signal processing circuit 900.High-voltage DC power supply
Anode is connect with the first partial pressure unit of anode 200, and the first partial pressure unit of anode 200 is connect with positive switch 300, positive switch
300 connect with the first end of the second partial pressure unit of anode 400, the second end ground connection of the second partial pressure unit of anode 400, anode second
The first end of partial pressure unit 400 is connect by positive signal processing circuit 800 with controller 100；The cathode of high-voltage DC power supply
Connect with the first partial pressure unit of cathode 500, the first partial pressure unit of cathode 500 is connect with negative switch 600, negative switch 600 with
The first end connection of the second partial pressure unit of cathode 700, the second end ground connection of the second partial pressure unit of cathode 700, cathode second divide
The first end of unit 700 is connect by negative signal processing circuit 900 with controller 100；Controller 100 respectively with positive switch
The control terminal connection of 300 control terminal and negative switch 600.Controller 100 sends out control signal, controls insulation monitoring module
The working condition of positive switch 300 and negative switch 600 in 20 so that insulation monitoring module 20 is in different conditions, obtains
The equation group of high voltage direct current circuit positive and negative busbar insulation against ground resistance under different conditions.Meanwhile controller 100 acquires positive signal
The voltage signal that processing circuit 800 and negative signal processing circuit 900 provide by positive signal processing circuit 800 and is born
The voltage that pole signal processing circuit 900 provides substitutes into high voltage direct current circuit positive and negative busbar insulation against ground resistance under different conditions
Equation group solved, obtain the resistance value of high voltage direct current circuit positive and negative busbar insulation against ground resistance.
In one embodiment, as shown in figure 3, VBAT-H, VBAT-L are representing high-voltage direct current (battery pack) just respectively
Pole and cathode, RP, RN are not practical institute's connecting resistance, and RP, RN are respectively the insulated electro of VBAT-H, VBAT-L (car body) over the ground
Resistance, when insulation characterisitic is good, RP, RN value are infinity.Wherein, the first partial pressure unit of anode can include resistance R1, anode
Second partial pressure unit can include resistance R2, and the first partial pressure unit of cathode can include resistance R3, and the second partial pressure unit of cathode can
To include resistance R4.R0, R1, R2, R3, R4 are the resistance of known resistance value, and 5V DC power supplies are powered to light coupling relay Q1, and 5V is straight
Galvanic electricity source is connected by resistance R0 with light coupling relay Q1, provides metering function.R1, R2 composition high voltage direct current anode divide over the ground
Network, potential-divider network, C1, C2 are filter capacitor to R3, R4 composition high voltage direct current cathode over the ground.Light coupling relay Q1 includes two and opens
It closes, switch 56 and switch 78, wherein, positive switch can be switch 78, and negative switch can be switch 56.CON-1、CON-2
The input/output port of controller is connect respectively, for controlling two disconnections switched and closure in light coupling relay.When CON-1 is accessed
When low level signal, CON-2 access high level signals, switch 78 is closed and switchs 56 and disconnect in Q1 relays, and U1 is light at this time
When switch 78 is closed in coupling relay, the voltage signals of R2 over the ground.When CON-2 accesses low level signal, CON-1 access height
56 are switched during level signal, in Q1 relays to be closed and switch 78 and disconnect, when U2 is that switch 56 is closed in light coupling relay at this time,
The voltage signals of R4 over the ground.
When switch 78 is closed in Q1 relays, in parallel with RP again, resistance value RX=((R1+ after R1 connects with R2
R2) //RP), RX constitutes a DC loop with RN, high-voltage DC power supply, then can show that the equation containing RP, RN is as follows：
Wherein, U0 is VBAT-H to VBAT-L voltages, that is, high-voltage DC power supply voltage, and U1 is resistance R2 voltage-to-grounds, U1 warps
Controller is fed back to after crossing positive signal processing circuit signal processing, its occurrence is can be calculated by controller.
Similarly, when switch 56 is closed in Q1 relays, in parallel with RN again, resistance value RY=((R3 after R3 connects with R4
+ R2) //RN), RY constitutes another DC loop with RP, high-voltage DC power supply, then can obtain the equation containing RP, RN such as
Under：
Wherein, U0 is VBAT-H to VBAT-L voltages, that is, high-voltage DC power supply voltage, and U2 is resistance R4 voltage-to-grounds, U2 warps
Controller is fed back to after crossing negative signal processing circuit signal processing, concrete values are can be calculated by controller.Combine above-mentioned
Two equations can then solve the resistance value of high-voltage DC power supply positive and negative busbar insulation against ground resistance RP, RN.
In one embodiment, the circuit diagram of positive signal processing circuit is as shown in figure 4, voltage division signal U1 passes through electricity
R5 current limlitings are hindered, the in-phase input end of operational amplifier U1-A is input to after the protection of diode D1 clampers, operational amplifier U1-A rises
Voltage follower acts on, and buffer action, existing interference effect when avoiding controller directly to U1 signal acquisitions are played to U1 signals.
Resistance R6, C4 play low pass filter, and treated U1 signals after clamp diode D2 using being input to controller later
It is calculated for acquisition.
In one embodiment, the circuit diagram of negative signal processing circuit is as shown in figure 5, voltage division signal U2 passes through electricity
R7 current limlitings are hindered, the in-phase input end of operational amplifier U2-B is input to after the protection of diode D3 clampers, operational amplifier U2-B rises
Voltage follower acts on, and buffer action, existing interference effect when avoiding controller directly to U2 signal acquisitions are played to U2 signals.
Since U2 signals are negative pressure signal, controller is unable to Direct Recognition processing, and U2 signals need to be using the anti-of operational amplifier U2-A
Mutually become positive pressure signal.For operational amplifier U2-A in-phase input ends, current-limiting resistance, C5 are filter capacitor to R9 over the ground, and resistance R8 is
The current-limiting resistance of operational amplifier U2-A in-phase input ends, feedback resistances of the resistance R10 for operational amplifier U2-A output terminals, U2
Signal after two stage amplifer U2-A, U2-B processing by the low pass filter that is made of resistance R11, capacitance C7, and by clamper
Controller is input to after diode D4 to calculate for acquisition.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Embodiment described above only expresses the several embodiments of the present invention, and description is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that those of ordinary skill in the art are come
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of insulation detection device, which is characterized in that divided including the first partial pressure unit of anode, positive switch, anode second
Unit, the first partial pressure unit of cathode, negative switch, the second partial pressure unit of cathode and controller；
The anode of external power supply is connect with first partial pressure unit of anode, and first partial pressure unit of anode is opened with the anode
Connection connects, and the positive switch is connect with the first end of second partial pressure unit of anode, second partial pressure unit of anode
Second end is grounded, and the first end of second partial pressure unit of anode is connect with the controller；The cathode of external power supply with it is described
The first partial pressure unit of cathode connects, and first partial pressure unit of cathode is connect with the negative switch, the negative switch and institute
State the first end connection of the second partial pressure unit of cathode, the second end ground connection of second partial pressure unit of cathode, the cathode second
The first end of partial pressure unit is connect with the controller；The controller respectively with the control terminal of the positive switch and described
The control terminal connection of negative switch；
When the controller controls the positive switch to be closed, the external power supply, the first partial pressure unit of the anode and
The second partial pressure unit of anode forming circuit, obtains first voltage equation；When the controller controls the negative switch to close
During conjunction, the external power supply, the first partial pressure unit of the cathode, the second partial pressure unit of cathode forming circuit obtain second
Voltage equation；The first voltage equation and second voltage equation joint are solved, obtain the external power supply anode
The resistance value of insulation against ground resistance and the resistance value of cathode insulation against ground resistance.
2. insulation detection device according to claim 1, which is characterized in that further include filter circuit, the filter circuit
It is in parallel with second partial pressure unit of anode and the second partial pressure unit of the cathode respectively.
3. insulation detection device according to claim 1, which is characterized in that positive signal processing circuit is further included, it is described
The first end of the second partial pressure unit of anode is connect by the positive signal processing circuit with the controller.
4. insulation detection device according to claim 3, which is characterized in that the positive signal processing circuit includes operation
Amplifier, the operational amplifier include in-phase input end, inverting input and output terminal, the same phase of the operational amplifier
Input terminal is connect with the first end of second partial pressure unit of anode, the inverting input of the operational amplifier and the operation
The output terminal connection of amplifier, the output terminal of the operational amplifier are connect with the controller.
5. insulation detection device according to claim 4, which is characterized in that the positive signal processing circuit further includes two
Pole pipe, the in-phase input end of the operational amplifier are connected by the first end of the diode and second partial pressure unit of anode
It connects.
6. insulation detection device according to claim 4, which is characterized in that the positive signal processing circuit further includes electricity
Resistance and capacitance, the output terminal of the operational amplifier pass through resistance one end with the controller and the capacitance respectively
Connection, the other end ground connection of the capacitance.
7. insulation detection device according to claim 1, which is characterized in that negative signal processing circuit is further included, it is described
The first end of the second partial pressure unit of cathode is connect by the negative signal processing circuit with the controller.
8. insulation detection device according to claim 7, which is characterized in that the negative signal processing circuit includes first
Operational amplifier and second operational amplifier, first operational amplifier include in-phase input end, inverting input and
Output terminal, the second operational amplifier include in-phase input end, inverting input and output terminal, first operation amplifier
The in-phase input end of device is connect with the first end of second partial pressure unit of cathode, the anti-phase input of first operational amplifier
End is connect with the output terminal of first operational amplifier, and the output terminal of first operational amplifier is put with second operation
The inverting input connection of big device, the inverting input of the second operational amplifier and the output of the second operational amplifier
End connection, the output terminal of the second operational amplifier connect with the controller, the second operational amplifier it is same mutually defeated
Enter end ground connection.
9. insulation detection device according to claim 8, which is characterized in that the negative signal processing circuit further includes limit
Leakage resistance, the output terminal of first operational amplifier are defeated by the current-limiting resistance and the reverse phase of the second operational amplifier
Enter end connection.
10. insulation detection device according to claim 8, which is characterized in that the negative signal processing circuit further includes
Feedback resistance, the inverting input of the second operational amplifier pass through the feedback resistance and the second operational amplifier
Output terminal connects.
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| CN201810070171.XA CN108196171A (en) | 2018-01-24 | 2018-01-24 | Insulation detection device |
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|---|---|---|---|
| CN201810070171.XA CN108196171A (en) | 2018-01-24 | 2018-01-24 | Insulation detection device |
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| CN109633248A (en) * | 2019-02-02 | 2019-04-16 | 华润新能源(大同阳高)风能有限公司 | A kind of observation circuit in direct current output circuit |
| CN111366785A (en) * | 2020-04-02 | 2020-07-03 | 南方电网电动汽车服务有限公司 | Insulation monitoring circuit and method for direct current charging pile |
| CN113791277A (en) * | 2021-09-16 | 2021-12-14 | 惠州市乐亿通科技有限公司 | Insulation resistance detection device and forklift |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109633248A (en) * | 2019-02-02 | 2019-04-16 | 华润新能源(大同阳高)风能有限公司 | A kind of observation circuit in direct current output circuit |
| CN109633248B (en) * | 2019-02-02 | 2024-03-19 | 华润新能源(大同阳高)风能有限公司 | Monitoring circuit of direct current output loop |
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| US11733310B2 (en) | 2021-09-16 | 2023-08-22 | RoyPow Technology Co, Ltd. | Insulation resistance detection device and forklift truck |
| CN117517906A (en) * | 2024-01-02 | 2024-02-06 | 博最科技(苏州)有限公司 | Insulation detection calculation method of self-adaptive Y capacitor |
| CN117517906B (en) * | 2024-01-02 | 2024-03-22 | 博最科技(苏州)有限公司 | Insulation detection calculation method of self-adaptive Y capacitor |
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Application publication date: 20180622 |