CN116893360A - Battery insulation virtual voltage detection circuit, virtual voltage detection method and electronic equipment - Google Patents

Battery insulation virtual voltage detection circuit, virtual voltage detection method and electronic equipment Download PDF

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Publication number
CN116893360A
CN116893360A CN202310664678.9A CN202310664678A CN116893360A CN 116893360 A CN116893360 A CN 116893360A CN 202310664678 A CN202310664678 A CN 202310664678A CN 116893360 A CN116893360 A CN 116893360A
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China
Prior art keywords
voltage
insulation
electrically connected
circuit
virtual
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CN202310664678.9A
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陈鹤森
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Eve Energy Co Ltd
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Eve Energy Co Ltd
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Priority to CN202310664678.9A priority Critical patent/CN116893360A/en
Publication of CN116893360A publication Critical patent/CN116893360A/en
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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
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • 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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

The invention discloses a battery insulation virtual voltage detection circuit, a virtual voltage detection method and electronic equipment, wherein the virtual voltage detection circuit comprises an insulation detection circuit, a voltage acquisition circuit, a main positive relay, a main negative relay and a control module, insulation detection operation is carried out on a battery module through the insulation detection circuit so that the battery module is in an insulation state, when the battery module is in the insulation state, a first voltage of the main positive relay and a second voltage of the main negative relay are acquired through the voltage acquisition circuit, the first voltage and the second voltage are transmitted to the control module, and a virtual voltage detection result is determined through the control module according to the first voltage and the second voltage. Therefore, the embodiment of the invention can detect the virtual voltage problem of the battery through the first voltage and the second voltage, can improve the accuracy and the efficiency of the virtual voltage detection, can further solve the virtual voltage problem when the battery has the virtual voltage problem, and is further beneficial to improving the safety and the stability of the operation of a battery system.

Description

Battery insulation virtual voltage detection circuit, virtual voltage detection method and electronic equipment
Technical Field
The present invention relates to the field of battery detection technologies, and in particular, to a battery insulation virtual voltage detection circuit, a virtual voltage detection method, and an electronic device.
Background
In actual life, in the field of battery management of new energy electric vehicles, insulation detection of a battery pack is generally performed through a topological form of a half-bridge topology, wherein the half-bridge topology insulation detection circuit can control on-off of an optical coupler device through a GPIO port, so that the insulation detection function is realized. However, in general, this way of implementing insulation detection may cause a problem that a virtual voltage exists between the back end of the non-closed main positive relay and the inner side of the main negative relay (where the virtual voltage problem refers to that when the ac conductor is measured by the high-impedance ammeter and the non-power supply conductor is still certain voltage due to factors such as long distance approaching and side-by-side, the voltage is not actually used when the ac conductor is actually connected to the load), so that the whole battery pack system generates a virtual voltage. Therefore, it is important to provide a new detection method to improve the accuracy and efficiency of the virtual voltage detection, so as to improve the accuracy and intelligence of solving the virtual voltage problem, and further improve the running safety and stability of the battery management system.
Disclosure of Invention
The invention aims to solve the technical problem of providing a battery insulation virtual voltage detection circuit, a virtual voltage detection method and electronic equipment, which can detect the virtual voltage problem of a battery, improve the accuracy and efficiency of the virtual voltage detection, further execute matched processing operation according to the virtual voltage detection result of the battery to eliminate the virtual voltage in the battery, and be beneficial to improving the safety and stability of the operation of a battery system.
In order to solve the technical problems, a first aspect of the invention discloses a battery insulation virtual voltage detection circuit method, wherein the virtual voltage detection circuit comprises an insulation detection circuit, a voltage acquisition circuit, a main positive relay, a main negative relay and a control module, wherein:
the first end of the insulation detection circuit is electrically connected with the first end of the main positive relay, the first end of the insulation detection circuit is used for being electrically connected with the first end of the battery module, the second end of the main positive relay is electrically connected with the first end of the voltage acquisition circuit, the second end of the voltage acquisition circuit is electrically connected with the main negative relay, the third end of the voltage acquisition circuit is electrically connected with the first end of the control module, the second end of the insulation detection circuit is used for being electrically connected with the second end of the battery module, and the second end of the insulation detection circuit is used for being grounded;
The insulation detection circuit is used for performing insulation detection operation on the battery module so as to enable the battery module to be in an insulation state;
the voltage acquisition circuit is used for acquiring a first voltage of the main positive relay and a second voltage of the main negative relay when the battery module is in the insulating state, and transmitting the first voltage and the second voltage to the control module;
and the control module is used for determining a virtual voltage detection result according to the first voltage and the second voltage.
As an optional implementation manner, in the first aspect of the present invention, the virtual voltage detection circuit further includes a virtual voltage processing circuit, where:
the first end of the virtual voltage processing circuit is electrically connected with the fourth end of the voltage acquisition circuit, and the second end of the virtual voltage processing circuit is electrically connected with the second end of the control module;
the control module is further used for generating a virtual voltage processing control signal according to the virtual voltage detection result and transmitting the virtual voltage processing control signal to the virtual voltage processing circuit;
the virtual voltage processing circuit can be used for executing virtual voltage processing operation matched with the virtual voltage processing control signal according to the virtual voltage processing control signal.
As an optional implementation manner, in the first aspect of the present invention, the virtual voltage detection circuit further includes a precharge circuit, wherein:
the first end of the pre-charging circuit is electrically connected with the third end of the main positive relay, and the second end of the pre-charging circuit is electrically connected with the fourth end of the main positive relay;
the pre-charging circuit is used for protecting the main positive relay so as to prevent the main positive relay from being damaged due to the fact that instantaneous high current flows through the main positive relay when the power supply is switched on.
As an optional implementation manner, in the first aspect of the present invention, the virtual voltage processing circuit includes: an optocoupler device, wherein:
the first end of the optocoupler is electrically connected with the fourth end of the voltage acquisition circuit, the second end of the optocoupler is electrically connected with the fifth end of the voltage acquisition circuit, and the third end of the optocoupler is electrically connected with the fourth end of the control module;
and the optical coupler is used for executing on operation or off operation matched with the virtual voltage processing control signal according to the virtual voltage processing control signal.
As an alternative embodiment, in the first aspect of the present invention, the pre-charging circuit includes a pre-charging resistor and a pre-charging relay, wherein:
The first end of the pre-charging resistor is electrically connected with the third end of the main positive relay, the second end of the pre-charging resistor is electrically connected with the first end of the pre-charging relay, and the second end of the pre-charging relay is electrically connected with the fourth end of the main positive relay.
As an optional implementation manner, in the first aspect of the present invention, the voltage collecting circuit includes a first voltage dividing resistor, a second voltage dividing resistor, and a voltage collecting unit, where:
the first end of the first voltage dividing resistor is electrically connected with the second end of the main positive relay and the first end of the voltage acquisition unit respectively, the second end of the first voltage dividing resistor is electrically connected with the first end of the second voltage dividing resistor, the second end of the second voltage dividing resistor is electrically connected with the second end of the voltage acquisition unit and the main negative relay respectively, and the third end of the voltage acquisition unit is electrically connected with the first end of the control module.
As an optional implementation manner, in the first aspect of the present invention, the insulation detection circuit includes a first insulation resistor, a second insulation resistor, a first bridge arm matching resistor, a second bridge arm matching resistor, a third bridge arm matching resistor, a fourth bridge arm matching resistor, a first insulation detection switch, a second insulation detection switch, and a third insulation detection switch, where:
The first end of the first insulation resistor is electrically connected with the first end of the main positive relay, the first end of the first insulation detection switch and the first end used for being electrically connected with the battery module, the second end of the first insulation resistor is electrically connected with the first end of the second insulation detection switch and the first end of the second insulation resistor, the second end of the first insulation detection switch is electrically connected with the first end of the first bridge arm matching resistor, the second end of the first bridge arm matching resistor is electrically connected with the first end of the second bridge arm matching resistor and the first end of the third insulation detection switch respectively, the second end of the second bridge arm matching resistor is electrically connected with the second end of the second insulation detection switch and the first end of the third bridge arm matching resistor respectively, the second end of the third insulation resistor is electrically connected with the second end of the fourth bridge arm matching resistor, the second end of the third insulation detection switch and the second end of the battery module are electrically connected with the ground.
As an optional implementation manner, in the first aspect of the present invention, the voltage acquisition circuit further includes: third insulation resistance, fourth insulation resistance, wherein:
The first end of the third insulation resistor is electrically connected with the first end of the first voltage dividing resistor, the second end of the third insulation resistor is electrically connected with the first end of the fourth insulation resistor, and the second end of the fourth insulation resistor is electrically connected with the second end of the second voltage dividing resistor.
As an optional implementation manner, in the first aspect of the present invention, the virtual voltage processing circuit further includes a triode, a first capacitor, a first resistor, and a second resistor, where:
the third end of the optocoupler is electrically connected with the first end of the first resistor and the first end of the second resistor respectively, the second end of the first resistor is used for being electrically connected with an input power supply, the fourth end of the optocoupler is electrically connected with the second end of the second resistor and the collector electrode of the triode respectively, the emitter electrode of the triode is electrically connected with the first end of the first capacitor and is used for being grounded, and the base electrode of the triode is electrically connected with the second end of the first capacitor and the fourth end of the control module respectively;
wherein, the control module is an MCU chip.
The invention discloses a battery insulation virtual voltage detection method, which is applied to a battery insulation virtual voltage detection circuit, wherein the virtual voltage detection circuit comprises an insulation detection circuit, a voltage acquisition circuit, a main positive relay, a main negative relay and a control module, and the method comprises the following steps:
The insulation detection circuit performs insulation detection operation on the battery module so as to enable the battery module to be in an insulation state;
when the battery module is in the insulating state, the voltage acquisition circuit acquires a first voltage of the main positive relay and a second voltage of the main negative relay, and transmits the first voltage and the second voltage to the control module;
and the control module determines a virtual voltage detection result according to the first voltage and the second voltage.
As an optional implementation manner, in the second aspect of the present invention, the virtual voltage detection circuit further includes a virtual voltage processing circuit;
and, the method further comprises:
and the control module generates a virtual pressure processing control signal according to the virtual pressure detection result, and transmits the virtual pressure processing control signal to the virtual pressure processing circuit so as to trigger the virtual pressure processing circuit to execute virtual pressure processing operation matched with the virtual pressure processing signal according to the virtual pressure processing signal.
As an optional implementation manner, in the second aspect of the present invention, the virtual voltage detection circuit further includes a pre-charging circuit;
and, the method further comprises:
When the power is turned on, current flows to the main positive relay through the pre-charging circuit, so that the main positive relay is prevented from being damaged due to the fact that instantaneous high current flows through the main positive relay when the power is turned on.
A third aspect of the present invention discloses an electronic device, which is characterized in that the electronic device includes the battery-insulated virtual voltage detection circuit according to any one of the first aspects.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, the virtual voltage detection circuit comprises an insulation detection circuit, a voltage acquisition circuit, a main positive relay, a main negative relay and a control module, wherein the insulation detection circuit is used for performing insulation detection operation on the battery module to enable the battery module to be in an insulation state, when the battery module is in the insulation state, the voltage acquisition circuit is used for acquiring the first voltage of the main positive relay and the second voltage of the main negative relay, the first voltage and the second voltage are transmitted to the control module, and the control module is used for determining a virtual voltage detection result according to the first voltage and the second voltage. Therefore, the method and the device can detect the virtual voltage problem of the battery through the collected first voltage of the main positive relay and the collected second voltage of the main negative relay, can improve the accuracy and efficiency of the virtual voltage detection, further can execute matched processing operation according to the virtual voltage detection result of the battery, can effectively solve the virtual voltage problem when the virtual voltage problem of the battery is detected, and further are beneficial to improving the safety and stability of the operation of a battery system.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a battery-insulated virtual voltage detection circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another battery-isolated virtual voltage detection circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a battery insulated virtual voltage detection circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a voltage acquisition circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an insulation detection circuit according to the present disclosure;
FIG. 6 is a schematic diagram of a virtual voltage processing circuit according to the present disclosure;
FIG. 7 is a schematic flow chart of a method for detecting the voltage of a battery insulation;
fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, apparatus, article, or article that comprises a list of steps or elements is not limited to only those listed but may optionally include other steps or elements not listed or inherent to such process, method, article, or article.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The invention discloses a battery insulation virtual voltage detection circuit, a virtual voltage detection method and electronic equipment, which can detect the virtual voltage problem of a battery through collected first voltage of a main positive relay and collected second voltage of a main negative relay, can improve the accuracy and efficiency of the virtual voltage detection, further can execute matched processing operation according to the virtual voltage detection result of the battery, can effectively solve the virtual voltage problem when detecting that the battery has the virtual voltage problem, and further is beneficial to improving the safety and stability of the operation of a battery system.
Example 1
Referring to fig. 1, fig. 1 is a schematic diagram illustrating a battery insulation virtual voltage detection circuit 10 according to an embodiment of the invention. As shown in fig. 1, the battery-insulated virtual voltage detection circuit 10 includes an insulation detection circuit 101, a voltage acquisition circuit 102, a main positive relay 103, a main negative relay 104, and a control module 105, wherein:
The first end of the insulation detection circuit 101 is electrically connected with the first end of the main positive relay 103, the first end of the insulation detection circuit 101 is used for being electrically connected with the first end of the battery module, the second end of the main positive relay 103 is electrically connected with the first end of the voltage acquisition circuit 102, the second end of the voltage acquisition circuit 102 is electrically connected with the main negative relay 104, the third end of the voltage acquisition circuit 102 is electrically connected with the first end of the control module 105, the second end of the insulation detection circuit 101 is used for being electrically connected with the second end of the battery module, and the second end of the insulation detection circuit 101 is used for being grounded;
an insulation detection circuit 101 for performing an insulation detection operation on the battery module to place the battery module in an insulated state;
the voltage acquisition circuit 102 is used for acquiring a first voltage of the main positive relay 103 and a second voltage of the main negative relay 104 when the battery module is in an insulating state, and transmitting the first voltage and the second voltage to the control module;
and the control module 105 is configured to determine a virtual voltage detection result according to the first voltage and the second voltage.
In the embodiment of the invention, the control module is an MCU chip. The MCU (Microcontroller Unit; MCU) chip is a micro control unit, also called a single chip microcomputer (Single Chip Microcomputer) or a single chip microcomputer, which properly reduces the frequency and specification of a central processing unit (Central Process Unit; CPU), and integrates peripheral interfaces such as a memory (memory), a counter (Timer), a USB, an A/D conversion, UART, PLC, DMA and the like, and even an LCD driving circuit on a single chip to form a chip-level computer for different application occasions to perform different combination control.
In the embodiment of the present application, further optionally, the virtual voltage detection result includes whether the battery module has a virtual voltage, and a reason why the battery module generates the virtual voltage.
In the embodiment of the application, optionally, when insulation detection is started, the total voltage of the battery module flows to the main positive relay and the main negative relay, wherein the first voltage outside the main positive relay and the second voltage inside the main negative relay are collected through the voltage collecting circuit, and the first voltage and the second voltage are analyzed through the control module to obtain a virtual voltage detection result. Further optionally, when the battery module is in an insulating state, the main positive relay and the main negative relay are both in an off state.
As can be seen, implementing the battery-insulated virtual voltage detection circuit 10 described in fig. 1 can insulate the battery module through the insulation detection circuit 101 so that the battery module is in an insulated state, and when the battery module is in an insulated state, the voltage acquisition circuit 102 acquires the first voltage of the main positive relay 103 and the second voltage of the main negative relay 104, the first voltage and the second voltage are transmitted to the control module 105, the virtual voltage detection result is determined through the control module 105 according to the first voltage and the second voltage, whether the acquired external voltage of the main positive relay 103 and the internal voltage of the main negative relay 104 exist in the determination circuit or not and the reason for generating the virtual voltage in the determination circuit can be determined, compared with the prior art, when the insulation detection is realized, the voltage between the positive end and the negative end of the high-voltage connector is generally detected so that the virtual voltage is detected, the problem that the virtual voltage detection accuracy is low exists is solved, the virtual voltage detection result can be determined through detecting the first voltage outside the main positive relay 103 and the second voltage on the inner side of the main negative relay 104, whether the acquired virtual voltage is detected by the main positive relay 103 or not, the virtual voltage detection accuracy can be further improved, and the reliability can be further accurately determined, compared with the second voltage detection accuracy is further, and the reliability can be further improved.
In an alternative embodiment, as shown in fig. 2, fig. 2 is a schematic structural diagram of another battery-insulated virtual voltage detection circuit 10 according to an embodiment of the present invention, where the virtual voltage detection circuit 10 further includes a virtual voltage processing circuit 106, and wherein:
the first end of the virtual voltage processing circuit 106 is electrically connected with the fourth end of the voltage acquisition circuit 102, and the second end of the virtual voltage processing circuit 106 is electrically connected with the second end of the control module 105;
the control module 105 is further configured to generate a virtual voltage processing control signal according to the virtual voltage detection result, and transmit the virtual voltage processing control signal to the virtual voltage processing circuit 106;
the virtual voltage processing circuit 106 is configured to perform a virtual voltage processing operation matched with the virtual voltage processing control signal according to the virtual voltage processing control signal.
In this alternative embodiment, optionally, when the control module 105 is configured to generate a virtual voltage processing control signal according to the virtual voltage detection result, and transmit the virtual voltage processing control signal to the virtual voltage processing circuit 106, the control module is specifically configured to: and judging whether the virtual voltage detection result is used for indicating that virtual voltage exists in the current circuit, analyzing the target reason for the existence of virtual voltage in the current circuit when judging that the virtual voltage detection result indicates that the virtual voltage exists in the current circuit, generating a virtual voltage processing control signal according to the target reason, and transmitting the virtual voltage processing control signal to the virtual voltage processing circuit 106.
In this alternative embodiment, further alternatively, the dummy voltage processing control signal includes an on control signal or an off control signal.
It can be seen that, in this alternative embodiment, the control module 105 is capable of generating the virtual voltage processing control signal according to the virtual voltage detection result, transmitting the virtual voltage processing control signal to the virtual voltage processing circuit 106, performing, by the virtual voltage processing circuit 106, a virtual voltage processing operation matched with the virtual voltage processing control signal, and by the control module 105 and the virtual voltage processing circuit 106, the virtual voltage problem existing in the circuit can be solved, compared with the prior art that only the virtual voltage problem existing in the circuit can be detected, the application is capable of not only detecting the first voltage outside the main positive relay 103 and determining the virtual voltage detection result by detecting the second voltage inside the main negative relay 104, thereby being beneficial to improving the accuracy and efficiency of determining the virtual voltage detection result, but also the control module 105 is capable of generating the corresponding virtual voltage processing control signal and transmitting the virtual voltage processing control signal to the virtual voltage processing circuit 106, so as to trigger the virtual voltage processing circuit 106 to perform the matched virtual voltage processing operation according to the virtual voltage processing control signal, and being beneficial to improving the safety and stability of the system existing in the virtual voltage circuit and eliminating the virtual voltage problem existing in the circuit by opening the circuit between the main positive relay 103 and the main negative relay 104.
In another alternative embodiment, the virtual voltage detection circuit 10 further comprises a pre-charge circuit 107, wherein:
a first end of the precharge circuit 107 is electrically connected to a third end of the main positive relay 103, and a second end of the precharge circuit 107 is electrically connected to a fourth end of the main positive relay 103;
a precharge circuit 107 for protecting the main positive relay 103 from instantaneous high current flowing through the main positive relay 103 when the power is turned on, so that the main positive relay 103 is damaged.
In this alternative embodiment, the precharge circuit 107 is optionally connected in parallel with the main positive relay 103; further, after the pre-charging circuit 107 is connected in parallel with the main positive relay 103, when the power is connected, the current firstly reduces the current flowing into the main positive relay 103 through the pre-charging circuit 107, so that the current flowing into the main positive relay 103 meets the current requirement of the main positive relay 103. Further alternatively, the precharge circuit 107 can function to protect the main positive relay 103 by being connected in parallel with the main positive relay 103; if the precharge circuit 107 is not present in the circuit, the transient current of the main positive relay 103 is too large, which easily causes contact ablation of the main positive relay 103, and further easily damages circuit devices such as the main positive relay 103, and causes unstable operation or low safety of the circuit.
It can be seen that, in this alternative embodiment, the precharge circuit 107 included in the virtual voltage detection circuit 10 is connected in parallel with the main positive relay 103, so as to protect the main positive relay 103, so as to avoid the phenomenon that when the main positive relay 103 is damaged due to the instant high current flowing through the main positive relay 103 when the power is turned on, compared with the prior art, if the precharge circuit 107 does not exist in the circuit, the accessed instant current of the main positive relay 103 is too large, which easily causes the contact ablation of the main positive relay 103, and further easily damages circuit devices such as the main positive relay 103.
In yet another alternative embodiment, the virtual voltage processing circuit 106 includes: optocoupler 1061, where:
the first end of the optocoupler 1061 is electrically connected to the fourth end of the voltage acquisition circuit 102, the second end of the optocoupler 1061 is electrically connected to the fifth end of the voltage acquisition circuit 102, and the third end of the optocoupler 1061 is electrically connected to the fourth end of the control module 105;
The optocoupler 1061 is configured to perform an on operation or an off operation matched to the dummy voltage processing control signal according to the dummy voltage processing control signal.
In this alternative embodiment, optional optocoupler 1061 includes one of a photo coupler, a phototransistor, a photodiode, and a phototransistor. Further alternatively, the optocoupler device is composed of two parts, namely a light emitting source and a light receiver, the light emitting source and the light receiver are assembled in the same airtight shell and are isolated by a transparent insulator, and further, the pin of the light emitting source is an input end, and the pin of the light receiver is an output end.
In this alternative embodiment, the control module 105 is an MCU chip; optionally, when the battery module performs insulation detection, a virtual voltage processing signal for disconnecting the optocoupler 1061 is generated, so that a control signal mcu_gpio of a GPIO port of the MCU chip is set to 0, so that the optocoupler U1M is in a disconnected state, and a current loop flowing from the outer side of the main positive relay 103 to the inner side of the main negative relay 104 is cut off, thereby solving the problem that virtual voltage exists on the outer side of the main positive relay 103 in the insulation detection process of the battery module. Further, after the insulation detection is finished, a virtual voltage processing signal for conducting the optocoupler 1061 is generated, so that the control signal mcu_gpio of the GPIO port of the MCU chip is set to 1, the optocoupler U1M is in a closed conducting state, and after the optocoupler U1M is in a closed conducting state, the main positive relay 103 is closed again, so that the conduction of the circuit is restored.
As can be seen, in implementing this alternative embodiment, the optocoupler 1061 is capable of performing an on operation or an off operation matched with the virtual voltage processing control signal according to the virtual voltage processing control signal, so that a current loop flowing from the outer side of the main positive relay to the inner side of the main negative relay can be disconnected, so that the outer side of the main positive relay and the inner side of the main negative relay do not have a virtual voltage problem.
In yet another alternative embodiment, the precharge circuit 107 includes a precharge resistor 1071 and a precharge relay 1072, wherein:
the first end of the precharge resistor 1071 is electrically connected to the third end of the main positive relay 103, the second end of the precharge resistor 1071 is electrically connected to the first end of the precharge relay 1072, and the second end of the precharge relay 1072 is electrically connected to the fourth end of the main positive relay 103.
In this alternative embodiment, optionally, after the precharge resistor 1071 and the precharge relay 1072 are connected in series, one end after the series connection is connected to the main positive relay 103, and the other end after the series connection is connected to the main positive relay 103, that is: the pre-charging resistor 1071 and the pre-charging relay 1072 are connected in series and then connected in parallel with the main positive relay 103, when the battery module is powered on, the high-voltage bus is insulated, and each battery voltage is detected, if the detection is qualified, the pre-charging relay 1072 is powered on, and current passes through the pre-charging resistor 1071 from the positive bus to charge a capacitor element in a load; when the voltage at two ends of the capacitor is detected to be close to the bus voltage, the positive bus relay is closed again, and then the precharge relay 1072 is opened, and the battery module supplies power to the outside formally. In this way, the main positive relay 103 can be protected by the precharge resistor 1071 and the precharge relay 1072, and the main positive relay 103 is prevented from being damaged or failed due to excessive current which is instantaneously supplied.
As can be seen, implementing this alternative embodiment can protect the main positive relay 103 through the precharge resistor 1071 and the precharge relay 1072 included in the precharge circuit 107, prevent the main positive relay 103 from being damaged or failed due to the breakdown of the main positive relay 103 caused by the excessive instantaneous current, effectively prevent the phenomenon that the main positive relay 103 is damaged due to the excessive current flowing into the main positive relay 103, effectively protect the operation of circuit devices, and facilitate the improvement of the safety and stability of the circuit operation, and further facilitate the improvement of the safety and stability of the battery system operation.
In yet another alternative embodiment, the voltage acquisition circuit 102 includes a first voltage dividing resistor 1022, a second voltage dividing resistor 1023, and a voltage acquisition unit 1021, wherein:
the first end of the first voltage dividing resistor 1022 is electrically connected to the second end of the main positive relay 103 and the first end of the voltage acquisition unit 1021, the second end of the first voltage dividing resistor 1022 is electrically connected to the first end of the second voltage dividing resistor 1023, the second end of the second voltage dividing resistor 1023 is electrically connected to the second end of the voltage acquisition unit 1021 and the first end of the main negative relay 103, and the third end of the voltage acquisition unit 1021 is electrically connected to the first end of the control module 105.
In this alternative embodiment, the voltage acquisition unit 1021 may optionally include one of a voltage acquisition sensor and a voltage acquisition chip.
In this alternative embodiment, alternatively, the first voltage dividing resistor 1022 and the second voltage dividing resistor 1023 are voltage collecting voltage dividing resistors of the total voltage outside the main positive relay 103, and can divide the voltage when the voltage collecting unit 1021 collects the voltage of the total voltage outside the main positive relay 103.
As can be seen, in implementing the alternative embodiment, the total voltage on the outer side of the main positive relay 103 can be divided by the first voltage dividing resistor 1022 and the second voltage dividing resistor 1023, so that the voltage on the outer side loop of the main positive relay 103 can be adjusted, and then the voltage corresponding to a specific point in the outer side loop of the main positive relay 103 is reached, which can be beneficial to improving the accuracy and reliability of the voltage acquisition unit 1021 for acquiring the voltage on the outer side loop of the main positive relay 103, and can be beneficial to improving the convenience of adjusting the voltage on the outer side loop of the main positive relay 103; and the voltage acquisition unit 1021 is used for acquiring voltage, so that the accuracy and reliability of voltage acquisition can be improved, the efficiency of voltage acquisition can be improved, and the accuracy and efficiency of the follow-up virtual voltage detection result determination according to the first voltage and the second voltage can be further improved.
In yet another alternative embodiment, insulation detection circuit 101 includes a first insulation resistor RX1, a second insulation resistor RX2, a first leg matching resistor RQ1, a second leg matching resistor RQ2, a third leg matching resistor RQ3, a fourth leg matching resistor RQ4, a first insulation detection switch S1, a second insulation detection switch S2, a third insulation detection switch S3, wherein:
the first end of the first insulation resistor RX1 is electrically connected with the first end of the main positive relay 103, the first end of the first insulation detection switch S1 and the first end used for being electrically connected with the battery module, the second end of the first insulation resistor RX1 is electrically connected with the first end of the second insulation detection switch S2 and the first end of the second insulation resistor RX2, the second end of the first insulation resistor RX1 is electrically connected with the first end of the first bridge arm matching resistor RQ1, the second end of the first bridge arm matching resistor RQ1 is electrically connected with the first end of the second bridge arm matching resistor RQ2 and the first end of the third insulation detection switch S3 respectively, the second end of the second bridge arm matching resistor RQ2 is electrically connected with the second end of the second insulation detection switch S2 and the first end of the third bridge arm matching resistor RQ3 respectively, the second end of the third matching resistor RQ3 is electrically connected with the first end of the fourth bridge arm matching resistor RQ4, and the second end of the third bridge arm matching resistor RQ3 is electrically connected with the second end of the second bridge arm matching resistor RQ3 respectively and is used for being connected with the second end of the battery module.
In this optional embodiment, optionally, a half-bridge topology is adopted in the insulation detection circuit 101, where the first bridge arm matching resistor RQ1, the second bridge arm matching resistor RQ2, the third bridge arm matching resistor RQ3, and the fourth bridge arm matching resistor RQ4 are all half-bridge arm matching resistors. Further, the circuit can be divided by the first arm matching resistor RQ1, the second arm matching resistor RQ2, the third arm matching resistor RQ3, and the fourth arm matching resistor RQ4 to change the voltage and/or current in the loop of the insulation detection circuit 101.
In this alternative embodiment, alternatively, when the first insulation detection switch S1 and the second insulation detection switch S2 are simultaneously turned off, the total voltage in the battery module is not connected to the outside of the main positive relay, that is, the battery module is disconnected from the main positive relay 103 when the insulation detection switch S1 and the second insulation detection switch S2 are simultaneously turned off, and no insulation detection is performed at this time. Further alternatively, when the first insulation detection switch S1 and the second insulation detection switch S2 are simultaneously closed, insulation detection is turned on at this time, and current flows from the outside of the main positive relay 103 to the outside of the main positive relay 103 through the first insulation detection switch S1, and then flows to the inside of the main negative relay 104 through the first bridge arm matching resistor RQ1, the second bridge arm matching resistor RQ2, and the second insulation detection switch S2. Further, when the first insulation detection switch S1 and the third insulation detection switch S3 are simultaneously turned on, current flows from the outside of the main positive relay 103 through the first insulation detection switch S1 to the first arm matching resistor RQ1, the second arm matching resistor RQ2, the third arm matching resistor RQ3, and the fourth arm matching resistor RQ4, and further flows to the main negative relay 104.
It can be seen that, implementing this alternative embodiment can divide the insulation detection circuit through the first bridge arm matching resistor RQ1, the second bridge arm matching resistor RQ2, the third bridge arm matching resistor RQ3, and the fourth bridge arm matching resistor RQ4 to change the voltage and/or the current in the loop of the insulation detection circuit 101, further, by controlling the closing or opening of the first insulation detection switch S1, the second insulation detection switch S2, and the third insulation detection switch S3 to further control whether to perform insulation detection, the intelligence and convenience of controlling the insulation detection circuit 101 can be improved, and based on the three insulation detection switches, the first voltage outside the main positive relay 103 and the second voltage inside the main negative relay 104 can be detected through the paths of different current loops, so that the intelligence of detecting the first voltage and the second voltage can be improved, thereby being beneficial to improving the accuracy and reliability of detecting the first voltage and the second voltage, and further being beneficial to improving the accuracy and the intelligence of determining the virtual voltage detection result through the first voltage and the second voltage.
In yet another alternative embodiment, voltage acquisition circuit 102 further comprises: third insulation resistance 1024, fourth insulation resistance 1025, wherein:
The first end of the third insulation resistor 1024 is electrically connected to the first end of the first voltage dividing resistor 1022, the second end of the third insulation resistor 1024 is electrically connected to the first end of the fourth insulation resistor 1025, and the second end of the fourth insulation resistor 1025 is electrically connected to the second end of the second voltage dividing resistor 1023.
In this alternative embodiment, third insulation resistance 1024 and fourth insulation resistance 1025 are optional overall vehicle insulation resistances. Further optionally, the third insulating resistor 1024 and the fourth insulating resistor 1025 may be one or more of a metal film resistor, a carbon film resistor, a wire wound resistor, a cement resistor, a photoresistor, a thermistor, an adjustable resistor, and the like, which is not specifically limited in the embodiments of the present invention. Further, the insulation resistance is the most basic insulation index of the electrical equipment and the electrical equipment circuit, and can measure the safety performance of the electrical equipment and reflect the insulation state of the electrical equipment.
In this alternative embodiment, for example, when the first insulation detection switch S1 and the second insulation detection switch S2 are both in the closed state and the second insulation resistance RX 2=10m, if five resistors of the third insulation resistance 1024, the fourth insulation resistance 1025, the second bridge arm matching resistance RQ2, the third bridge arm matching resistance RQ3 and the fourth bridge arm matching resistance RQ4 are connected in series and in parallel, an equivalent resistance rcb=1.108M after the series and parallel connection, a total voltage U of the battery module is 352V and a resistance value of the first bridge arm matching resistance RQ1 and a resistance value of the second bridge arm matching resistance RQ2 are 0.6 ohm, and when an equivalent resistance value after the series connection of the two resistors of the third insulation resistance 1024 and the fourth insulation resistance 1025 is 12.565 ohm, a first voltage v1=uχrcb/(r1+r2+rcb) =352×1.108/(1.108+1.2) = 168.98V is calculated; further calculating a second voltage v2=168.98x10/12.565 =134.4v, wherein the voltage value of V2 is 134.4V, and determining the voltage value as a virtual voltage detection result according to the voltage value of V2; further, the voltage value of V2 is determined as the virtual voltage detection value.
It can be seen that implementing this alternative embodiment can insulate the circuit through third insulation resistance 1024 and fourth insulation resistance 1025, can make circuit and battery module be in insulating state, can improve follow-up accuracy and the reliability that carries out insulation detection to the circuit to be favorable to improving the accuracy that carries out virtual voltage detection to the circuit, and then be favorable to improving the accuracy of confirming virtual voltage detection result.
In yet another alternative embodiment, virtual voltage processing circuit 106 further includes transistor Q1M, first capacitor C1, first resistor 1062, and second resistor 1063, wherein:
the third end of the optocoupler 1061 is electrically connected to the first end of the first resistor 1062 and the first end of the second resistor 1063, the second end of the first resistor 1062 is electrically connected to an input power source, the fourth end of the optocoupler 1061 is electrically connected to the second end of the second resistor 1063 and the collector of the triode Q1M, the emitter of the triode Q1M is electrically connected to the first end of the first capacitor C1 and to ground, and the base of the triode Q1M is electrically connected to the second end of the first capacitor C1 and the fourth end of the control module 105;
wherein, the control module 105 is an MCU chip.
In this alternative embodiment, optionally, for example, the control module 105 sends the generated virtual voltage control signal to the triode Q1M, and can perform an amplifying operation on the virtual voltage control signal through the triode Q1M, and after performing a filtering operation on the virtual voltage control signal through the first capacitor C1, the virtual voltage control signal is transmitted to the optocoupler 1061, so that stability of transmission of the virtual voltage control signal and stability of circuit operation can be ensured; and the first resistor 1062 and the second resistor 1063 perform the functions of reducing current and reducing voltage in the circuit loop, so that the current and the voltage in the circuit can meet the safety conditions, and the phenomena of damage to the optocoupler 1061 caused by overlarge current or overlarge voltage can be avoided.
In the alternative embodiment, the MCU (Microcontroller Unit; MCU) chip is a micro control unit, also called a single chip microcomputer (Single Chip Microcomputer) or a single chip microcomputer, which is to properly reduce the frequency and specification of the central processing unit (Central Process Unit; CPU), integrate peripheral interfaces such as memory (memory), counter (Timer), USB, A/D conversion, UART, PLC, DMA and the like, and even LCD driving circuits on a single chip to form a chip-level computer for different application occasions to perform different combination control.
It can be seen that, implementing the alternative embodiment can perform the amplifying operation on the virtual voltage control signal through the triode Q1M, and filter the virtual voltage control signal through the first capacitor C1, so as to inhibit noise in the virtual voltage control signal, improve the signal-to-noise ratio of the virtual voltage control signal, and be beneficial to inhibiting oscillation in the virtual voltage control signal, and further inhibit interference of the virtual voltage control signal so as to improve reliability of the virtual voltage control signal, thereby being beneficial to improving stability of the virtual voltage control signal in the transmission process; and, the first resistor 1062 and the second resistor 1063 perform the functions of reducing current and reducing voltage in the circuit loop, so that the current and the voltage in the circuit can all meet the safety conditions, the phenomenon that the optocoupler 1061 is damaged due to overlarge current or overlarge voltage is avoided, the safety and the stability of the circuit operation are improved, and the stability and the accuracy of virtual voltage detection are improved.
Example two
Referring to fig. 7, fig. 7 is a schematic flow chart of a battery insulation virtual voltage detection method disclosed in an embodiment of the application, wherein the method can be applied to a battery insulation virtual voltage detection circuit, and the virtual voltage detection circuit comprises an insulation detection circuit, a voltage acquisition circuit, a main positive relay, a main negative relay and a control module; as shown in fig. 7, the battery insulation virtual voltage detection method may include the following operations:
701. the insulation detection circuit performs insulation detection operation on the battery module so as to enable the battery module to be in an insulation state.
702. When the battery module is in an insulating state, the voltage acquisition circuit acquires the first voltage of the main positive relay and the second voltage of the main negative relay, and transmits the first voltage and the second voltage to the control module.
703. The control module determines a virtual voltage detection result according to the first voltage and the second voltage.
As can be seen, implementing the battery insulation's virtual voltage detection method described in fig. 7 can insulate the battery module through the insulation detection circuit 101 so that the battery module is in an insulation state, and when the battery module is in an insulation state, the first voltage of the main positive relay and the second voltage of the main negative relay are collected through the voltage collection circuit, the first voltage and the second voltage are transmitted to the control module, the virtual voltage detection result is determined through the control module according to the first voltage and the second voltage, whether the virtual voltage condition exists in the collected outside voltage of the main positive relay and the inside voltage determination circuit of the main negative relay and the reason for generating the virtual voltage in the determination circuit are determined, compared with the prior art, when insulation detection is achieved, the voltage between the positive end and the negative end of the high-voltage connector is usually detected, so that the virtual voltage detection accuracy is low, the virtual voltage detection result can be determined through detecting the first voltage outside the main positive relay and the second voltage inside the main negative relay, the virtual voltage detection result can be improved, the system can be further accurately detected through the detection of the main positive relay and the second voltage, the system can be further accurately detected, the virtual voltage detection accuracy can be further improved, the system can be further accurately detected, and the virtual voltage detection accuracy can be further improved, and the system can be further accurately detected, and the reliability can be further improved.
In an alternative embodiment, the virtual voltage detection circuit further comprises a virtual voltage processing circuit;
and, the method further comprises:
the control module generates a virtual voltage processing control signal according to the virtual voltage detection result, and transmits the virtual voltage processing control signal to the virtual voltage processing circuit so as to trigger the virtual voltage processing circuit to execute virtual voltage processing operation matched with the virtual voltage processing signal according to the virtual voltage processing signal.
It can be seen that, that implementing this alternative embodiment can generate the virtual voltage processing control signal according to the virtual voltage detection result by using the control module, and transmit the virtual voltage processing control signal to the virtual voltage processing circuit, perform the virtual voltage processing operation matched with the virtual voltage processing control signal according to the virtual voltage processing control signal by using the virtual voltage processing circuit, and can solve the virtual voltage problem existing in the circuit by using the control module and the virtual voltage processing circuit, compared with only detecting whether the virtual voltage problem exists in the circuit in the prior art, the application can determine the virtual voltage detection result by detecting the first voltage outside the main positive relay and detecting the second voltage inside the main negative relay, thereby being beneficial to improving accuracy and efficiency of determining the virtual voltage detection result, and can also generate the corresponding virtual voltage processing control signal by using the control module in the application, and transmit the virtual voltage processing control signal to the virtual voltage processing circuit, so as to trigger the virtual voltage processing circuit to perform the virtual voltage processing operation matched according to the virtual voltage processing control signal.
In another alternative embodiment, the virtual voltage detection circuit further comprises a precharge circuit;
and, the method further comprises:
when the power is turned on, current flows to the main positive relay through the pre-charging circuit, so that the main positive relay is prevented from being damaged due to the fact that instantaneous high current flows through the main positive relay when the power is turned on.
Therefore, the implementation of the alternative embodiment can realize the protection of the main positive relay by connecting the pre-charging circuit and the main positive relay in parallel, so as to avoid the damage of the main positive relay caused by the instant high current flowing through the main positive relay when the power supply is turned on.
It should be noted that, for other descriptions of the insulation detection circuit, the voltage acquisition circuit, the main positive relay, the main negative relay and the control module, please refer to the descriptions of the related contents in the first embodiment, and the descriptions are not repeated here.
Example III
Fig. 8 discloses a schematic structural diagram of an electronic device, which is a device for detecting battery-insulated virtual voltage and includes a battery-insulated virtual voltage detection circuit 10 according to the first embodiment. It should be noted that, for the detailed description of the battery-insulated virtual voltage detection circuit 10, please refer to the detailed description of the related content of the first embodiment, and the detailed description is omitted.
As can be seen, the electronic device illustrated in fig. 8 performs an insulation detection operation on the battery module through the insulation detection circuit 10 to make the battery module in an insulation state, performs an insulation detection operation on the battery module through the insulation detection circuit to make the battery module in an insulation state when the battery module is in an insulation state, and collects a first voltage of the main positive relay and a second voltage of the main negative relay through the voltage collection circuit when the battery module is in an insulation state, and transmits the first voltage and the second voltage to the control module, and determines a virtual voltage detection result according to the first voltage and the second voltage through the control module. Therefore, the embodiment of the invention can detect the virtual voltage problem of the battery through the first voltage and the second voltage, can improve the accuracy and the efficiency of the virtual voltage detection, can further solve the virtual voltage problem when the battery has the virtual voltage problem, and is further beneficial to improving the safety and the stability of the operation of a battery system.
Finally, it should be noted that: the embodiment of the invention discloses a battery insulation virtual voltage detection circuit, a battery insulation virtual voltage detection method and an electronic device, which are only disclosed as the preferred embodiment of the invention, and are only used for illustrating the technical scheme of the invention, but not limiting the technical scheme; although the invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that; the technical scheme recorded in the various embodiments can be modified or part of technical features in the technical scheme can be replaced equivalently; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims (13)

1. The utility model provides a battery insulation's virtual voltage detection circuit which characterized in that, virtual voltage detection circuit includes insulation detection circuit, voltage acquisition circuit, main positive relay, main negative relay and control module, wherein:
the first end of the insulation detection circuit is electrically connected with the first end of the main positive relay, the first end of the insulation detection circuit is used for being electrically connected with the first end of the battery module, the second end of the main positive relay is electrically connected with the first end of the voltage acquisition circuit, the second end of the voltage acquisition circuit is electrically connected with the main negative relay, the third end of the voltage acquisition circuit is electrically connected with the first end of the control module, the second end of the insulation detection circuit is used for being electrically connected with the second end of the battery module, and the second end of the insulation detection circuit is used for being grounded;
The insulation detection circuit is used for performing insulation detection operation on the battery module so as to enable the battery module to be in an insulation state;
the voltage acquisition circuit is used for acquiring a first voltage of the main positive relay and a second voltage of the main negative relay when the battery module is in the insulating state, and transmitting the first voltage and the second voltage to the control module;
and the control module is used for determining a virtual voltage detection result according to the first voltage and the second voltage.
2. The battery insulated virtual voltage detection circuit of claim 1, further comprising a virtual voltage processing circuit, wherein:
the first end of the virtual voltage processing circuit is electrically connected with the fourth end of the voltage acquisition circuit, and the second end of the virtual voltage processing circuit is electrically connected with the second end of the control module;
the control module is further used for generating a virtual voltage processing control signal according to the virtual voltage detection result and transmitting the virtual voltage processing control signal to the virtual voltage processing circuit;
the virtual voltage processing circuit can be used for executing virtual voltage processing operation matched with the virtual voltage processing control signal according to the virtual voltage processing control signal.
3. The battery insulated virtual voltage detection circuit of claim 2, further comprising a pre-charge circuit, wherein:
the first end of the pre-charging circuit is electrically connected with the third end of the main positive relay, and the second end of the pre-charging circuit is electrically connected with the fourth end of the main positive relay;
the pre-charging circuit is used for protecting the main positive relay so as to prevent the main positive relay from being damaged due to the fact that instantaneous high current flows through the main positive relay when the power supply is switched on.
4. The battery insulated virtual voltage detection circuit of claim 2, wherein the virtual voltage processing circuit comprises: an optocoupler device, wherein:
the first end of the optocoupler is electrically connected with the fourth end of the voltage acquisition circuit, the second end of the optocoupler is electrically connected with the fifth end of the voltage acquisition circuit, and the third end of the optocoupler is electrically connected with the fourth end of the control module;
and the optical coupler is used for executing on operation or off operation matched with the virtual voltage processing control signal according to the virtual voltage processing control signal.
5. The battery insulated virtual voltage detection circuit of claim 3, wherein the pre-charge circuit comprises a pre-charge resistor and a pre-charge relay, wherein:
The first end of the pre-charging resistor is electrically connected with the third end of the main positive relay, the second end of the pre-charging resistor is electrically connected with the first end of the pre-charging relay, and the second end of the pre-charging relay is electrically connected with the fourth end of the main positive relay.
6. The battery insulated virtual voltage detection circuit of any one of claims 1-5, wherein the voltage acquisition circuit comprises a first voltage dividing resistor, a second voltage dividing resistor, and a voltage acquisition unit, wherein:
the first end of the first divider resistor is electrically connected with the second end of the main positive relay and the first end of the voltage acquisition unit respectively, the second end of the first divider resistor is electrically connected with the first end of the second divider resistor, the second end of the second divider resistor is electrically connected with the second end of the voltage acquisition unit and the main negative relay respectively, the third end of the voltage acquisition unit is electrically connected with the first end of the control module, the fourth end of the voltage acquisition unit is electrically connected with the first end of the optocoupler device, and the fifth end of the voltage acquisition unit is electrically connected with the second end of the optocoupler device.
7. The battery insulated virtual voltage detection circuit of claims 1-5, wherein the insulation detection circuit comprises a first insulation resistor, a second insulation resistor, a first leg matching resistor, a second leg matching resistor, a third leg matching resistor, a fourth leg matching resistor, a first insulation detection switch, a second insulation detection switch, a third insulation detection switch, wherein:
The first end of the first insulation resistor is electrically connected with the first end of the main positive relay, the first end of the first insulation detection switch and the first end used for being electrically connected with the battery module, the second end of the first insulation resistor is electrically connected with the first end of the second insulation detection switch and the first end of the second insulation resistor, the second end of the first insulation detection switch is electrically connected with the first end of the first bridge arm matching resistor, the second end of the first bridge arm matching resistor is electrically connected with the first end of the second bridge arm matching resistor and the first end of the third insulation detection switch respectively, the second end of the second bridge arm matching resistor is electrically connected with the second end of the second insulation detection switch and the first end of the third bridge arm matching resistor respectively, the second end of the third insulation resistor is electrically connected with the second end of the fourth bridge arm matching resistor, the second end of the third insulation detection switch and the second end of the battery module are electrically connected with the ground.
8. The battery insulated virtual voltage detection circuit of claim 6, wherein the voltage acquisition circuit further comprises: third insulation resistance, fourth insulation resistance, wherein:
The first end of the third insulation resistor is electrically connected with the first end of the first voltage dividing resistor, the second end of the third insulation resistor is electrically connected with the first end of the fourth insulation resistor, and the second end of the fourth insulation resistor is electrically connected with the second end of the second voltage dividing resistor.
9. The battery insulated virtual voltage detection circuit of claim 4, wherein the virtual voltage processing circuit further comprises a transistor, a first capacitor, a first resistor, and a second resistor, wherein:
the third end of the optocoupler is electrically connected with the first end of the first resistor and the first end of the second resistor respectively, the second end of the first resistor is used for being electrically connected with an input power supply, the fourth end of the optocoupler is electrically connected with the second end of the second resistor and the collector electrode of the triode respectively, the emitter electrode of the triode is electrically connected with the first end of the first capacitor and is used for being grounded, and the base electrode of the triode is electrically connected with the second end of the first capacitor and the fourth end of the control module respectively;
wherein, the control module is an MCU chip.
10. The utility model provides a battery insulation's virtual voltage detection method which characterized in that, the virtual voltage detection method is applied to battery insulation's virtual voltage detection circuit, wherein, virtual voltage detection circuit includes insulation detection circuit, voltage acquisition circuit, main positive relay, main negative relay and control module, the method includes:
The insulation detection circuit performs insulation detection operation on the battery module so as to enable the battery module to be in an insulation state;
when the battery module is in the insulating state, the voltage acquisition circuit acquires a first voltage of the main positive relay and a second voltage of the main negative relay, and transmits the first voltage and the second voltage to the control module;
and the control module determines a virtual voltage detection result according to the first voltage and the second voltage.
11. The battery insulated virtual voltage detection method of claim 10, wherein the virtual voltage detection circuit further comprises a virtual voltage processing circuit;
and, the method further comprises:
and the control module generates a virtual pressure processing control signal according to the virtual pressure detection result, and transmits the virtual pressure processing control signal to the virtual pressure processing circuit so as to trigger the virtual pressure processing circuit to execute virtual pressure processing operation matched with the virtual pressure processing signal according to the virtual pressure processing signal.
12. The battery insulated virtual voltage detection method of claim 11, wherein the virtual voltage detection circuit further comprises a pre-charge circuit;
And, the method further comprises:
when the power is turned on, current flows to the main positive relay through the pre-charging circuit, so that the main positive relay is prevented from being damaged due to the fact that instantaneous high current flows through the main positive relay when the power is turned on.
13. An electronic device comprising a battery-insulated virtual voltage detection circuit as claimed in any one of claims 1-9.
CN202310664678.9A 2023-06-06 2023-06-06 Battery insulation virtual voltage detection circuit, virtual voltage detection method and electronic equipment Pending CN116893360A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310664678.9A CN116893360A (en) 2023-06-06 2023-06-06 Battery insulation virtual voltage detection circuit, virtual voltage detection method and electronic equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310664678.9A CN116893360A (en) 2023-06-06 2023-06-06 Battery insulation virtual voltage detection circuit, virtual voltage detection method and electronic equipment

Publications (1)

Publication Number Publication Date
CN116893360A true CN116893360A (en) 2023-10-17

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Country Link
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