CN212031650U - Multichannel direct current insulation resistance detection protection circuit - Google Patents
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Abstract
The utility model discloses a multichannel direct current insulation resistance detects protection circuit, including multichannel insulation resistance detection circuitry, sampling conditioning circuit and controller, multichannel insulation resistance detection circuitry links to each other with sampling conditioning circuit, sampling conditioning circuit's output links to each other with the controller, sampling conditioning circuit is sent to the voltage of multichannel direct current power supply's positive end among the insulation resistance detection circuitry, sampling conditioning circuit is sent to the voltage of direct current power supply negative end to casing among the insulation resistance detection circuitry, the relay among the controller gives the relay control signal for insulation resistance detection circuitry, the controller is gathered through its sampling channel and is come from the signal that sampling conditioning circuit sent, thereby it obtains the last insulation resistance of multichannel direct current power supply positive end to casing and the lower insulation resistance of direct current power supply negative end to casing to carry out the calculation processing, the utility model provides thereby the reliability of multichannel direct current insulation resistance detection protection circuit among the high-power application promotes the system can Reliability and reduced cost.
Description
Technical Field
The utility model relates to a protection circuit, in particular to multichannel direct current insulation resistance detects protection circuit.
Background
With the development of smart power grids, active power distribution networks are realized, and an electric energy router serving as a power electronic device plays a role of a switch for connecting ports of each subsystem, so that safe and reliable operation of the electric energy router is very important. The electric automobile is connected with the charging and discharging of the micro-grid and the consumption of the photovoltaic energy storage device to electric energy, a large number of power electronic transformers are introduced, the power electronic transformers belong to power electronic devices, and the safe and reliable operation of the power electronic transformers directly influences the construction of an active power distribution network. Since most of these power electronic devices are configured by AC-DC converters, high demands are placed on the insulation resistance of both the AC side leakage current and the DC side of the power electronic devices in the active power distribution network.
The electric leakage caused by broken wires and short circuits on the alternating current side can be detected and protected by an electric leakage detection device, and is mature; the methods proposed at present for the dc side mainly include a relay-based insulation resistance detection method and a method of injecting a small ac signal. The direct current insulation resistance detection method for injecting the alternating current small signal is used for detecting electric leakage by simulating an electric leakage detection method on an alternating current side, a small alternating current voltage signal is injected on the direct current side during detection, insulation resistance on the direct current side is obtained by a similar electric leakage detection principle on the alternating current side, the detection method is relatively visual and simple, but low-frequency alternating current ripples are introduced on the direct current side, and therefore power supply quality of the device is influenced. Therefore, most of the existing methods are relay-based insulation resistance detection methods.
At present, there are 2 methods for detecting insulation resistance based on relays, one is a bridge method, and the other is an external resistance switching measurement method. The bridge method needs to close and open the relay switch at the same time, measure whether the voltages on the external resistors are equal, and if so, consider the insulation to be normal. The problem is that if the upper and lower insulation resistors are simultaneously reduced, the method cannot detect the upper and lower insulation resistors, and a resistor is directly connected to the shell at the positive and negative ends of the direct current, so that the insulation resistors are artificially reduced, and unsafe factors are increased. Therefore, a measurement method of switching by adopting an external resistor is more applicable, namely a method of adopting a relay series resistor, but for the fault of short circuit with a shell caused by the damage of a direct current side positive end connection wire under the condition of no ground wire connection, the relay can be burnt by applying overhigh voltage to a relay contact series resistor branch circuit, and the device can be fired under the serious condition, so that the requirement of safety and reliability of an active power distribution network is not met.
In a power electronic device in an active power distribution network, a plurality of direct current circuits with capacity expansion in parallel are arranged on a direct current side, so that a multi-channel direct current transmission or power supply framework is formed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a multichannel direct current insulation resistance detects protection circuit, overcome above-mentioned direct current high pressure and directly add the great current that relay series resistance branch road appears and burn out the possible trouble of relay with thereby promote reliability and reduce cost that multichannel direct current insulation resistance detected protection circuit's reliability lift system in the high-power application.
The purpose of the utility model is realized like this: a multi-channel direct-current insulation resistance detection protection circuit comprises a multi-channel insulation resistance detection circuit, a sampling conditioning circuit and a controller, wherein the multi-channel insulation resistance detection circuit is connected with the sampling conditioning circuit, the output end of the sampling conditioning circuit is connected with the controller, the voltage of the positive end of a multi-channel direct-current power supply in the insulation resistance detection circuit is sent to the sampling conditioning circuit, the voltage of the shell to the negative end of the direct-current power supply in the insulation resistance detection circuit is sent to the sampling conditioning circuit, a relay control signal is sent to a relay in the insulation resistance detection circuit by the controller, the controller collects the signal sent by the sampling conditioning circuit through a sampling channel of the controller, and the signal is calculated to obtain the upper insulation resistance of the shell from the positive end of the multi-channel direct-current power supply and the lower insulation resistance of the negative end of the direct-current power supply.
As a further limitation of the present invention, the multi-channel insulation resistance detection circuit comprises: the circuit comprises upper insulation resistors Rx1, Rx2 …, Rxn, a lower insulation resistor Ry, an external resistor R1, an external resistor R2 and a relay K; the positive end of a direct current power supply DC1+ is connected with an upper insulation resistor Rx1, the positive end of a direct current power supply DC2+ is connected with an upper insulation resistor Rx2, the positive end of a direct current power supply DCn + is connected with an upper insulation resistor Rxn, the other end of the upper insulation resistor is connected to the chassis ground, the chassis ground is connected with a lower insulation resistor Ry, an external resistor R1 and an external resistor R2, the other ends of the lower insulation resistor Ry and the external resistor R1 are connected to the negative end of the direct current power supply, the external resistor R2 is connected with one end of a contact of a relay K, and the other end of the contact of the relay K is connected to the negative end of;
the voltage VDCi (i is 1,2 … n) of a multi-channel DC power supply in the multi-channel insulation resistance detection circuit is sent to a sampling conditioning circuit, the voltage Voki (k is 1,2; i is 1,2 … n) of a shell relative to the negative end of the DC power supply is sent to the sampling conditioning circuit, and the voltage signals are filtered and matched by the sampling conditioning circuit to be proper values and then sent to an AD sampling channel and an ADBi (i is 1,2 …, n) sampling channel of a controller.
Compared with the prior art, the beneficial effects of the utility model reside in that: the utility model discloses an use multichannel direct current insulation resistance detection circuitry, parallelly connected an external resistance R1 on the branch road basis of relay contact series connection external resistance R2 to avoid when the earth wire is connected direct current side positive terminal connection damage lead to with the casing short circuit fault condition, because of too high direct current voltage is applied to relay contact series resistance branch road, lead to the possibility that the relay burns out, thereby improved the fail safe nature of system operation; to the direct current side that has the multichannel, adopt the utility model discloses the scheme only needs a relay just can realize the direct current insulation resistance detection of every passageway to implement protect function, help the high power density realization of power electronic equipment in the initiative distribution network, and further promoted the reliability, the cost is reduced, thereby improved the price/performance ratio.
Drawings
Fig. 1 is a block diagram of the protection circuit of the present invention.
Fig. 2 is a schematic diagram of the protection circuit of the present invention.
Fig. 3 is the utility model discloses equivalent schematic diagram when relay K contact breaks off in multichannel direct current insulation resistance detection circuitry.
Fig. 4 is the equivalent schematic diagram of the relay K contact closing time in the multi-channel dc insulation resistance detection circuit of the present invention.
Fig. 5 is a schematic diagram of an embodiment of the protection circuit of the present invention.
Symbol names in fig. 1:
symbol names in fig. 2:
other symbol names are the same as those in FIG. 1.
The symbol names in fig. 3 and 4 are the same as those in fig. 1 and 2.
Symbol names in fig. 5:
other symbol names in fig. 5 are the same as those in fig. 2.
Detailed Description
The present invention will be further described with reference to the following specific embodiments.
The utility model discloses a to new energy mark NB/T32004 supplyes power electronic equipment's requirement in to the initiative distribution network with other 2013 standard, to implementing the protection under the unsatisfied standard requirement's of direct current end insulation resistance condition, provide a multichannel direct current insulation resistance detection protection circuit and protection method.
As shown in fig. 1 and fig. 2, the multi-channel dc insulation resistance detection protection circuit of the present invention is composed of the following components:
the device comprises a multi-channel insulation resistance detection circuit 1, a sampling conditioning circuit 2 and a controller 3. The multi-channel insulation resistance detection circuit 1 is connected with the sampling conditioning circuit 2, the output end of the sampling conditioning circuit 2 is connected with the controller 3, in the insulation resistance detection circuit, positive terminal voltages VDCi (i is 1,2 … n) of a plurality of direct current power supplies DC1+, DC2+ … and DCn + are sent to a sampling conditioning circuit 2, the voltage Voki (K is 1,2; i is 1,2 … n) of the shell at the negative end of the direct current power supply in the insulation resistance detection circuit is sent to the sampling conditioning circuit 2, the controller 3 sends a relay control signal Vctr to a relay K in the insulation resistance detection circuit, the controller 3 collects the signal sent by the sampling conditioning circuit 2 through a sampling channel thereof, and performing calculation processing to obtain an upper insulation resistance Rxi (i is 1,2 … n) of the positive end of the multi-path direct-current power supply to the shell and a lower insulation resistance Ry of the negative end of the multi-path direct-current power supply to the shell.
The multichannel insulation resistance detection circuitry in the circuit includes: the device comprises upper insulation resistors Rx1, Rx2 … Rxn, a lower insulation resistor Ry, an external resistor R1, an external resistor R2 and a relay K; the positive end of a direct current power supply DC1+ is connected with an upper insulation resistor Rx1, the positive end of a direct current power supply DC2+ is connected with an upper insulation resistor Rx2, the positive end of a direct current power supply DCn + is connected with an upper insulation resistor Rxn, the other end of the upper insulation resistor is connected to the chassis ground, the chassis ground is connected with a lower insulation resistor Ry, an external resistor R1 and an external resistor R2, the other ends of the lower insulation resistor Ry and the external resistor R1 are connected to the negative end of the direct current power supply, the external resistor R2 is connected with one end of a contact of a relay K, and the other end of the contact of the relay K is connected to the negative end of;
in the multi-channel DC insulation resistance detection protection circuit, the voltage VDCi (i is 1,2 … n) of the multi-channel DC power supply of the multi-channel insulation resistance detection circuit 1 is sent to the sampling conditioning circuit 2, and the voltage Voki (k is 1,2; i is 1, 2) of the shell relative to the negative end of the DC power supply…n) is sent to a sampling conditioning circuit 2, and is sent to an AD sampling channel of a controller 3 after being filtered by the sampling conditioning circuit 2 and matched with a voltage signal to a proper valueLane and ADBi (i ═ 1,2 …, n) sampling channels.
The utility model discloses the during operation, when the power electronic device is gone up and is implemented direct current side insulation resistance and detect, send relay control signal Vctr low level instruction by controller 3 and make relay K's solenoid lose electricity, thereby relay K's contact disconnection, make R1 and Ry parallelly connected, the equivalent resistance after parallelly connected by R1 and Ry is established ties again with last insulation resistance Rxi (i is 1,2 … n) and can divide voltage and obtain Vo1i (i is 1,2 … n), and send the AD sampling channel of controller 3 through the sampling conditioning circuit, corresponding direct current power supply voltage VDCi (i is 1,2 … n) also send the ADBi (i is 1,2 … n) sampling channel of controller 3 through the sampling conditioning circuit simultaneously; after a short time delay in the program, the controller 3 sends out a high level command of a relay control signal Vctr to enable a coil of the relay K to be electrified, so that a contact of the relay K is closed, the R2 and the Ry are connected in parallel, equivalent resistance values obtained by connecting the R2, the R1 and the Ry in parallel are connected with an upper insulation resistor Rxi (i is 1,2 … n) in series and can be subjected to voltage division to obtain Vo2i (K is 1,2; i is 1,2 … n), and the Vo2i is sent to an AD sampling channel of the controller 3 through a sampling conditioning circuit; the controller 3 obtains the voltages Vo1i (i ═ 1,2 … n), Vo2i (i ═ 1,2 … n) from the AD sampling channels, and the corresponding dc power supply voltages VDCi (i ═ 1,2, … n) from the ADBi sampling channels…n) is subjected to calculation processing in a program, so that an upper insulation resistance value Rxi (i is 1,2 … n) and a lower insulation resistance value Ry of the corresponding direct current input end are obtained; in the program, the insulation resistance value of each direct current input channel can be obtained through time-sharing detection; and comparing the upper insulation resistance value and the lower insulation resistance value obtained by calculation with the insulation resistance value specified in the standard in the program so as to judge whether the insulation resistance on the direct current side passes the detection, if the insulation resistance value is higher than the insulation resistance value specified in the standard, sending a state instruction capable of being executed downwards, otherwise, sending an insulation fault instruction of a corresponding direct current channel, thereby protecting the device and the system.
As shown in the above description, although the positive voltages VDCi (i ═ 1,2 … n) of the multichannel dc power supplies may be different, the ground terminals of the multichannel dc power supplies are the same, so that only one relay K is needed to perform the detection of the insulation resistances of all the channels.
With reference to fig. 2, fig. 3 and 4 continue to illustrate the calculation method and process for implementing a multi-channel insulation resistance detection circuit based on a single relay K. The insulation resistance detection principle of the multi-channel insulation resistance detection circuit based on a single relay is that two linear equations are listed under two states of opening and closing of the contact of the relay K, so that the values of the upper insulation resistance Rxi (i ═ 1,2 … n) and the lower insulation resistance Ry in the multi-channel insulation resistance detection circuit 1 are solved.
When the power electronic device is powered on, the controller 3 sends a low level command, so that the coil of the relay K is powered off, and the contact of the relay K is in an open state, at this time, the equivalent circuit of the multi-channel insulation resistance detection circuit 1 in fig. 2 is as shown in fig. 3.
Since the relay K is in the off state, the external resistor R2 does not work in the circuit, so the following equation is listed according to the values of the collected voltages VDCi (i ═ 1,2 … n) and Vo1i (i ═ 1,2 … n):
can be calculated according to the sampling data
The specific value m, then the equation can be obtained:
when the controller 3 sends out a high level to electrify the wire of the relay K, so that the contact of the relay K is closed, the external resistors R2 and R1 are connected in parallel with the lower insulation resistor Ry, and at this time, the equivalent circuit of the multi-channel insulation resistor detection circuit 1 in fig. 2 is as shown in fig. 4.
When the contact of the relay K is in a closed state, R1, R2 resistors and Ry are connected in parallel and then connected in series with an upper insulation resistor Rxi to divide voltage to obtain Vo2i (i is 1 and 2 … n), and compared with the equivalent resistance value obtained by connecting a single external resistor R1 and Ry in parallel when the contact of the relay K is opened, the equivalent resistance value is changed, so that the following equation can be listed according to the measured Vo2i (i is 1 and 2 … n) and the measured direct-current power supply voltage VDCi (i is 1 and 2 … n).
Likewise, the values of the samples can be used to calculate
The specific value n, then the equation can be obtained:
combining equations (2) and (4) yields:
the value of the upper insulation resistance Rxi in the multi-channel insulation resistance detection circuit 1 can be obtained from equation (5):
Rxi＝R2·(n-m),(i＝1,2…n) (6)
reissue to order
The value of the lower insulation resistance Ry in the multi-channel insulation resistance detection circuit 1 can be found:
the utility model discloses a concrete implementation example as follows: in the final program, the calculated actual values of Rxi (i ═ 1,2 … n) and Ry are compared with the insulation resistance values specified in the standard, and it is determined whether or not the dc insulation resistance in the device satisfies the requirements. The above calculation process and judgment are implemented in the controller 3 by software programming.
The utility model discloses a concrete implementation example as follows:
the implementation of the method of the present invention is shown in fig. 5, and the method of the present invention is applied to the dual-channel DC side in the AC-DC type electric energy router to realize the design of the DC side insulation resistance detection circuit. The voltage of the direct current port is 650V, and the voltage of the alternating current side phase is 220V; TMS320F28335 of TI company is selected as the controller 3; the multi-channel insulation resistance detection circuit 1 (two channels in this example) mainly includes a relay and some resistors: the relay K is of a G2RG-2A model of ohm dragon, the value of the external resistor R1 is 5M omega, and the value of the external resistor R2 is 4M omega; rx1 and Rx2 are respectively upper insulation resistors from the positive end of the direct current power supply DC1+ and DC2+ to the machine shell, Ry is a lower insulation resistor from the machine shell to the negative end of the direct current power supply, and Rx1, Rx2 and Ry are resistors to be tested. The sampling conditioning circuit 2 is formed by a 3-path differential sampling circuit formed by operational amplifiers U1, the operational amplifiers adopt integrated operational amplifiers TL074 and respectively comprise A, B, C three operational amplifiers in the TL074 and resistors and capacitors at the periphery of the operational amplifiers; the differential sampling circuit formed by U1A and U1B conditions the voltages of DC power supplies DC1+ and DC2+ respectively, and after obtaining appropriate matching voltage signals, the signals are sent to the ADB2 sampling channel of ADB1 of the controller 3.
When the power router is powered on to work, the signal of the DC1+ channel of the DC power supply is not detected firstly. Sending a control signal Vctr of the relay to be a low level command by an IOA1(IO port) of the controller 3, enabling a wire packet of the relay K to lose power, disconnecting a contact of the relay K, enabling R1 and Ry to be connected in parallel, enabling equivalent resistance values after R1 and Ry are connected in parallel to be connected in series with an upper insulation resistor Rx1 to be subjected to voltage division to obtain Vo11, conditioning the voltage through a differential sampling circuit formed by an operational amplifier U1C, sending the conditioned voltage to an AD sampling channel of the controller 3, storing the value in a program variable of the controller 3, conditioning a voltage VDC1 of a direct current power supply DC1+ through the differential sampling circuit formed by the operational amplifier U1A, sending the conditioned voltage to an ADB1 sampling channel of the controller 3, and storing the value in the program variable of the controller 3; after a short time delay in the program, the controller 3 sends out a control signal Vctr of the relay, which is a high level command, so that a wire coil of the relay K is electrified, a contact of the relay K is closed, R2 and Ry are connected in parallel, equivalent resistance values obtained by connecting R2, R1 and Ry in parallel are connected in series with an upper insulation resistor Rx1 in the multi-channel insulation resistor detection circuit 1 for voltage division to obtain Vo21, the Vo21 is conditioned by a differential sampling circuit formed by an operational amplifier U1C and then sent to an AD sampling channel of the controller 3, and the value is stored in a program variable of the controller 3.
After the voltage signal of the DC1+ channel of the DC power supply is detected, the program sets a short time delay, and then the insulation resistance of the DC2+ channel of the DC power supply is detected. Sending a control signal Vctr of the relay to be a low level command by an IOA1(IO port) of the controller 3, enabling a wire packet of the relay K to lose power, disconnecting a contact of the relay K, enabling R1 and Ry to be connected in parallel, enabling equivalent resistance values after R1 and Ry are connected in parallel to be connected in series with an upper insulation resistor Rx2 to be subjected to voltage division to obtain Vo21, conditioning the voltage through a differential sampling circuit formed by an operational amplifier U1C, sending the conditioned voltage to an AD sampling channel of the controller 3, storing the value in a program variable of the controller 3, conditioning a voltage VDC2 of a direct current power supply DC2+ through the differential sampling circuit formed by the operational amplifier U1B, sending the conditioned voltage to an ADB2 sampling channel of the controller 3, and storing the value in the program variable of the controller 3; after a short time delay in the program, the controller 3 sends out a control signal Vctr of the relay, which is a high level command, so that a wire coil of the relay K is electrified, a contact of the relay K is closed, R2 and Ry are connected in parallel, equivalent resistance values obtained by connecting R2, R1 and Ry in parallel are connected in series with an upper insulation resistor Rx2 to obtain Vo22 through voltage division, the regulated equivalent resistance values are sent to an AD sampling channel of the controller 3 through a differential sampling circuit formed by an operational amplifier U1C, and the regulated equivalent resistance values are stored in a program variable of the controller 3.
Then calculating VDC1, Vo11 and Vo12 stored in the program variables of the controller 3 through a formula (6) and a formula (7) to obtain an upper insulation resistance Rx 1-831 k omega and a lower insulation resistance Ry-855 k omega of a direct current power supply DC1+ channel; similarly, the upper insulation resistance Rx2 of the direct current power supply DC2+ channel is 823k Ω, and the lower insulation resistance Ry is 841k Ω, which are calculated by equations (6) and (7) based on VDC2, Vo21, and Vo22 stored in the program variables of the controller 3; finally, the calculated direct current insulation resistance Rx1 is compared with 600k omega required by the standard in the program, the requirement is obviously met, so the program sends a command for normally executing the program downwards, otherwise, the controller 3 can give out a fault signal of the fault zone bit of the insulation resistance of the corresponding channel, namely, the corresponding direct current insulation fault signal is reported, and if and only if the insulation resistance of all the channels meets the standard requirement, the controller executes the subsequent program. Simulating a fault: the positive end inlet wire of the direct current channel 1 is damaged and is in short circuit with the machine shell, the controller 3 reports the fault of the direct current channel 1 during self-checking, and the equipment cannot be normally put into operation. The direct-current insulation resistance detection of the electric energy router with the dual-channel direct-current port is realized through only one relay, and the protection function can be realized.
The utility model has the advantages of only just can realize that multichannel direct current detects the insulation resistance of casing through a relay to can implement protect function. On the basis of the existing external resistor switching measurement method, only one resistor connected in parallel with a relay series resistor branch is added, and the multichannel direct-current insulation resistor is obtained through controller programming and is compared with an insulation resistance value specified by a standard so as to implement protection. The utility model discloses for the method that adopts a plurality of relays to detect multichannel direct current insulation resistance at present, under the prerequisite of ensureing device safety and life safety, have low cost, high reliability to help high power density power electronic device's realization, the event has the high price/performance ratio. And safety and reliability are realized, and the development of the smart power grid is facilitated. The utility model discloses can obtain following benefit:
1) the detection and protection of the multi-channel direct-current insulation resistor can be realized, and the used devices are few, so that the reliability is improved, the cost is reduced, and the high cost performance is realized;
2) the utility model can be applied not only to AC-DC type electric energy router, but also to power electronic transformer circuit in active distribution network, electric vehicle charging and discharging machine and photovoltaic energy storage device;
3) the detection circuit can be protected to the maximum extent when a fault occurs, so that the reliability of the system is improved;
4) the utility model discloses a thinking is applicable to other port impedance detection that have multichannel direct current converter equally.
The present invention is not limited to the above embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some replacements and deformations for some technical features without creative labor according to the disclosed technical contents, and these replacements and deformations are all within the protection scope of the present invention.
Claims (2)
1. A multi-channel direct current insulation resistance detection protection circuit is characterized by comprising a multi-channel insulation resistance detection circuit, a sampling conditioning circuit and a controller, the multi-channel insulation resistance detection circuit is connected with the sampling conditioning circuit, the output end of the sampling conditioning circuit is connected with the controller, the voltage of the positive terminal of the multi-path DC power supply in the insulation resistance detection circuit is sent to the sampling conditioning circuit, the voltage of the shell of the insulation resistance detection circuit to the negative end of the direct current power supply is sent to the sampling conditioning circuit, the controller sends a relay control signal to the relay of the insulation resistance detection circuit, the controller collects the signal sent by the sampling conditioning circuit through a sampling channel of the controller, and calculating to obtain the upper insulation resistance of the positive end of the multi-path direct current power supply to the shell and the lower insulation resistance of the negative end of the direct current power supply to the shell.
2. The multi-channel DC insulation resistance detection protection circuit according to claim 1, wherein the multi-channel insulation resistance detection circuit comprises: the circuit comprises upper insulation resistors Rx1, Rx2 …, Rxn, a lower insulation resistor Ry, an external resistor R1, an external resistor R2 and a relay K; the positive end of a direct current power supply DC1+ is connected with an upper insulation resistor Rx1, the positive end of a direct current power supply DC2+ is connected with an upper insulation resistor Rx2, the positive end of a direct current power supply DCn + is connected with an upper insulation resistor Rxn, the other end of the upper insulation resistor is connected to the chassis ground, the chassis ground is connected with a lower insulation resistor Ry, an external resistor R1 and an external resistor R2, the other ends of the lower insulation resistor Ry and the external resistor R1 are connected to the negative end of the direct current power supply, the external resistor R2 is connected with one end of a contact of a relay K, and the other end of the contact of the relay K is connected to the negative end of;
the voltage VDCi (i =1,2 … n) of a multi-channel DC power supply in the multi-channel insulation resistance detection circuit is sent to a sampling conditioning circuit, the voltage Voki (k =1,2; i =1,2 … n) of a shell relative to the negative end of the DC power supply is sent to the sampling conditioning circuit, and the voltage signal is filtered and matched by the sampling conditioning circuit to a proper value and then sent to an AD sampling channel and an ADBi (i =1,2 …, n) sampling channel of a controller.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112394229A (en) * | 2021-01-21 | 2021-02-23 | 广州思泰信息技术有限公司 | Insulation resistance testing device and insulation resistance testing method |
| US20220252657A1 (en) * | 2021-02-09 | 2022-08-11 | Huawei Digital Power Technologies Co., Ltd. | Converter system, method and apparatus for detecting insulation resistance of system, and medium |
| CN115308520A (en) * | 2022-10-10 | 2022-11-08 | 杭州三海电子有限公司 | Method, program and circuit for determining delay time of multichannel sequential sampling current |
| CN117647676A (en) * | 2024-01-26 | 2024-03-05 | 永联科技(常熟)有限公司 | Insulation resistance detection circuit and detection method |
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2020
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112394229A (en) * | 2021-01-21 | 2021-02-23 | 广州思泰信息技术有限公司 | Insulation resistance testing device and insulation resistance testing method |
| US20220252657A1 (en) * | 2021-02-09 | 2022-08-11 | Huawei Digital Power Technologies Co., Ltd. | Converter system, method and apparatus for detecting insulation resistance of system, and medium |
| US11977110B2 (en) * | 2021-02-09 | 2024-05-07 | Huawei Digital Power Technologies Co., Ltd. | Converter system, method and apparatus for detecting insulation resistance of system, and medium |
| CN115308520A (en) * | 2022-10-10 | 2022-11-08 | 杭州三海电子有限公司 | Method, program and circuit for determining delay time of multichannel sequential sampling current |
| CN115308520B (en) * | 2022-10-10 | 2023-01-24 | 杭州三海电子有限公司 | Method, program and circuit for determining delay time of multichannel sequential sampling current |
| CN117647676A (en) * | 2024-01-26 | 2024-03-05 | 永联科技(常熟)有限公司 | Insulation resistance detection circuit and detection method |
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Denomination of utility model: A multi-channel DC insulation resistance detection and protection circuit Granted publication date: 20201127 Pledgee: Bank of Jiangsu Limited by Share Ltd. Zhenjiang branch Pledgor: Jiangsu zhiong New Energy Technology Co.,Ltd. Registration number: Y2024980018442 |