JP3774103B2 - Intelligent junction box - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an intelligent junction box that distributes a plurality of types of power supplies and loads.
[0002]
[Prior art]
In general, in an automobile, a power source (hereinafter referred to as a battery 2) is charged using an alternator 1 as shown in FIG. 10, and the electric power from the battery 2 is led to a junction box 4 (J / B) by a cable 3 (harness). It will be. In the junction box 4, power is distributed to various loads (light, meter).
[0003]
Further, the junction box 4 as described above is also used in the electric vehicle. The junction box 4 in this electric vehicle is provided with a control relay circuit or the like for flowing a large current.
[0004]
That is, since such a conventional junction box is basically intended for power distribution (power distribution), a protection circuit is provided on the load side for overcurrent protection due to a short circuit or the like.
[0005]
[Problems to be solved by the invention]
However, since the conventional junction box is basically power distribution (voltage distribution), there is a problem that a protection circuit for overcurrent protection must be provided on the load side.
[0006]
The present invention has been made to solve the above problems, and it is possible to obtain an intelligent junction box having a function of performing stable power distribution and measuring a remaining capacity of a power source without providing a protection circuit or the like on the load side. Objective.
[0007]
[Means for Solving the Problems]
  The present inventionIn a junction box provided between a high-voltage battery, a low-voltage battery that is predetermined times lower than the high-voltage battery, and a load, high-voltage first power from the high-voltage battery is input. The first power component in the high voltage system unit is removed from an excess component of the first power and the supply of the first power is stopped or transmitted according to the instruction. High voltage system power component detection means for detecting a current value and a first voltage value;A switching element is connected in series to the primary side coil, the first power in the high voltage system unit is input to one of the primary side coils, and the first low side is connected to the secondary side by turning on and off the switching element. A second AC power having a voltage AC power and a second DC voltage lower than the first low voltage are obtained, and the AC power and the second DC power are sent directly to the outside, and the low voltage A converter for obtaining a third low-voltage third DC power for the battery and supplying the third DC power to the batteryGenerated by the low voltage system part and the low voltage system partThe current of the third DC powerWhen the low voltage power component detection means to detect and the first voltage detected by the high voltage system power component detection means indicate an overvoltage, the supply of the first power of the high voltage system section is stopped, and Generated in the low voltage systemThe low voltage of the AC power and the second and third DC powers are set to a low current value.Detect,theseThe gist of the invention is that it includes a controller that controls the low-voltage system unit to stabilize the output.
[0008]
  In addition, the controller
  in frontMeans for stopping the supply of the first power to the high voltage system section when the first current value detected by the high voltage system component detection means indicates an overcurrent; and the low voltage system When the current value of the third power detected by the power component detection means indicates an overcurrent, the gist is provided with means for keeping the switching element of the converter off.
[0009]
    Also,The controller is
Means for inputting the first voltage value and the first current value detected by the high voltage system power component detection means, and collecting the values to estimate the remaining capacity of the high voltage battery by a current integration method; Means for inputting the voltage value and current value of the third power detected by the low voltage system power detection means, and collecting the values to estimate the remaining capacity of the low voltage battery by a current integration method; The gist is to have both.
[0010]
    Also,The high voltage battery is charged with a high voltage first power from a car alternator;
The controller is
The charge accumulation status of the high voltage battery is determined from the first voltage value detected by the high voltage system power component detection means, and when the charge accumulation status is determined to be less than or equal to a predetermined value, the alternator The gist is that a means for starting charging of a high-voltage battery is provided.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
FIG. 1 is a schematic configuration diagram of an intelligent junction box according to the first embodiment.
[0018]
An intelligent junction box 10 (hereinafter referred to as a junction box) shown in FIG. 1 is mounted on a high-voltage vehicle including a high-voltage battery 11 of 36V and a low-voltage battery 13 of 12V. That is, the relationship between the voltage values of both batteries is 1: 3.
[0019]
The high voltage battery 11 is connected in parallel to the 42 V output alternator 1 connected to the engine 14 (ENG). The low-voltage battery 13 is provided on the downstream side of the junction box 10 and is charged with the output (14V) from the junction box 10.
[0020]
That is, the low voltage battery 13 is connected to the DC 14 V output terminal of the junction box 10 by the cable 15, and the high voltage battery 11 is connected to the input terminal of the junction box 10 by the cable 16.
[0021]
The junction box 10 is provided with a high-voltage pattern 18 (indicated by a thick line) for transmitting a high voltage of 36 V on the substrate, and this pattern 18 (high-voltage system) is provided with an overvoltage countermeasure for high voltage. The circuit 17, the high voltage main relay 19, the current sensor 20, and the voltage sensor 21 (insulated type) are interposed.
[0022]
The current sensor 20 detects the current of the battery 11, and a specific connection configuration will be described later.
[0023]
The overvoltage countermeasure circuit 17, the pattern 18, and the high voltage main relay 19 are collectively referred to as a high voltage system unit.
[0024]
In addition, the junction box 10 is provided with a DC-DC converter 28 that receives a high-voltage first power from the output of the high-voltage main relay 19 and obtains a plurality of types of low voltages.
[0025]
That is, the junction box 10 is used as a down converter for the low-voltage battery 13.
[0026]
<Configuration of each part>
The above-described overvoltage countermeasure circuit 27 for high voltage includes, for example, a Zener diode ZD1 and an electric field capacitor C1, as shown in FIG. 2 (other resistors and capacitors are provided, but only the main configuration is shown in this example). Even when the overvoltage exceeds 36V due to the abnormality of the alternator 1, etc., it is always maintained at 36V.
[0027]
As shown in FIG. 1, the DC-DC converter 28 is composed of a transformer, a diode, a capacitor, a switching element, and the like so as to obtain a direct current 14V (12V for a low voltage battery), a direct current 7V, and an alternating current 14V. Yes. AC 14V is realized by not connecting a capacitor, a diode or the like to the coil 28a.
[0028]
This AC 14V is sent to the outside through a pattern 24 a connected to the output of the DC-DC converter 28. Further, the direct current 14V is sent to the low voltage battery 13 through the pattern 24b connected to the output of the DC-DC converter 28.
[0029]
The direct current 7V is sent to the outside through a pattern 24c connected to the output of the DC-DC converter 28.
[0030]
The DC-DC converter 28 and the patterns 24a, 24b, and 24c are collectively referred to as a low voltage system unit.
[0031]
The battery controller 30 includes a high voltage system battery state monitoring circuit 31, a relay timing control circuit 32, a DC / DC converter control circuit 33, a low power system battery monitoring circuit 34, a CPU, and the like.
[0032]
The high voltage system battery state monitoring circuit 31 reads the voltage value of the high voltage system voltage sensor 21 and the current value of the current sensor 20, and determines from these values whether the 36V battery 11 is in a fully charged state. This determination is performed, for example, by setting a predetermined threshold value and comparing the threshold value with the input voltage. That is, a voltage value in a predetermined range for full charging is set as Vmax1 to Vmax2, and full charging is performed when the input voltage value is within this range.
[0033]
The relay timing controller circuit 32 immediately turns off the high-voltage main relay 19 when the CPU 35 determines an overcurrent (short circuit, rare short, load abnormality, etc.) from the current value of the high-voltage pattern 18. Further, when the CPU 35 determines that the ignition is on, the high-voltage main relay 19 is turned on for a predetermined period.
[0034]
The DC / DC converter control circuit 33 reads the voltage values of the 14V output terminal and 7V output terminal of the DC-DC converter 28, and switches the switching control signal so that the voltage value approaches the reference value (14V, 7V). Control the duty ratio.
[0035]
A voltage dividing circuit (not shown) is connected to the pattern 29 for weak voltage sensing. The weak electric battery state monitoring circuit 34 detects the voltage applied to the 12V battery 13 by detecting the voltage at this voltage dividing point, and also reads the current value of the weak electric current sensor 26 and determines 12V from these values. It is determined whether the battery 13 is fully charged.
[0036]
<Description of operation>
The operation of the junction box 10 configured as described above will be described below.
[0037]
The role of the alternator 1 in the power supply system is to supply power consumed by the electric load of the vehicle when the engine is running, and to charge the battery 11 and battery 13 so that the state of charge of the battery is good (next time Maintain a sufficient amount of electricity for starting the engine).
[0038]
As the ignition is turned on, the CPU 35 of the battery controller 30 in the junction box 10 uses the relay timing controller 32 to turn off the high-voltage main relay 19 for a predetermined period, and then turns on the high-voltage main relay 19. To do.
[0039]
Accordingly, power from the battery 11 for 36V is supplied to a load (not shown) via the pattern 18 in the junction box 10, the overvoltage countermeasure circuit 17, the high voltage main relay 19, the current sensor 20, and the voltage sensor 18. Supplied.
[0040]
At this time, if an abnormality on the load side or an abnormality occurs in the alternator 1 and a voltage several times 36V is supplied, this overvoltage is suppressed by the Zener diode ZD1 of the overvoltage countermeasure circuit 17 and a stable high voltage of 36V is obtained. Is supplied to the load side.
[0041]
On the other hand, the DC-DC converter 28 inputs high-voltage first power from the high-voltage main relay 19 to the input end, and the AC voltage is 14V and the DC voltage is 14V depending on the number of windings of the coil, capacitors, diodes, switching elements, and the like. Then, DC 7V is obtained at the output end.
[0042]
The DC-DC converter 28 is controlled by a battery controller 30.
[0043]
For example, it is desirable to use the AC 14V described above as shown in FIG. FIG. 3 shows that AC power can be easily supplied in a non-contact manner, and AC 14 V generated in the junction box 10 of the present embodiment is guided to the load side by a cable 37. A magnetic coil unit 38 is connected to the cable 37. As shown in FIG. 3, the magnetic coil unit 38 includes a connector 39 and a magnetic body 40, and an AC 14 V copper wire is wound around a central protrusion of the magnetic body 40.
[0044]
That is, the magnetic flux 42 is generated by this winding as shown in FIG. By providing a circuit (coil, iron core, etc.) for detecting the magnetic flux 42 in the electronic unit, AC 14V can be easily received on the electronic unit side.
[0045]
Further, the battery controller 30 obtains the duty ratio of the control signal of the switching element in the DC-DC converter 28 and turns the switching element on and off in order to stably supply the outputs 14V and 7V of the DC-DC converter 28. .
[0046]
Further, the battery controller 30 samples the current values of the weak current system current sensor 26 and the high voltage system current sensor 20, and when the current value exceeds a predetermined value during a predetermined period (for example, 100 microsec), The high voltage main relay 19 is maintained in the OFF state by determining that the load or the cable is short-circuited or the short-circuit, and the switching element is maintained in the OFF state. That is, the supply of the first power from the high-voltage battery 11 to the outside and the low-voltage system unit is stopped.
[0047]
Further, the battery controller 30 measures the remaining capacity of each battery as shown in FIG. 4 from the voltage and current of the high voltage system and the weak current system.
[0048]
In FIG. 4, (a) shows the measuring method of the remaining capacity of the battery 11 of 36V, (b) shows the measuring method of the remaining capacity of the battery 13 of 12V, and it is 2 series parallel processing. It is shown.
[0049]
In other words, the remaining battery capacity measurement function is composed of a high voltage battery remaining capacity measurement function and a low voltage battery remaining capacity measurement function. A low voltage battery and a high voltage battery are mixed and used in the vehicle. The remaining capacity of both batteries is estimated at the same time, and 42V from the alternator 1 is charged to the high voltage battery 11 as necessary from this estimated value, or 14V from the junction box 10 is reduced to the low voltage. The battery 13 is charged.
[0050]
The low-voltage battery remaining capacity measurement function samples the current value of the weak current detected by the current sensor 26 and the voltage of the weak current obtained through the pattern 29 for weak current sensing every 500 microsec. When 8 data are collected, each is averaged. Then, 100 sets of averaged average current data and average voltage data are collected. That is, as time passes, as shown in FIG. 4B, 100 average data are scattered in the lower right direction in the coordinate system including the current-voltage axis.
[0051]
Then, a linear expression (Y = aX + b) relating to current and voltage is obtained by the least square method based on the 100 averaged current data and voltage data. That is, the tendency of 100 data is defined by a straight line (Y = aX + b).
[0052]
Next, the intersection of the predetermined virtual current value (−10 A) and the straight line (Y = aX + b) is obtained, and the point where the perpendicular from the intersection to the voltage axis intersects with the voltage is determined as the remaining of the current 12V battery 13. The estimated voltage (VSOC) corresponding to the capacity is obtained.
[0053]
When the estimated voltage (VSOC) is low, the battery controller 30 sends a charge control signal to the alternator 1 and charges the battery 13 so that the stable 12V can be sufficiently maintained during the next run. Make it.
[0054]
The high-voltage battery remaining capacity measuring function samples the high-voltage current value detected by the current sensor 20 and the voltage obtained by the insulated voltage sensor 21 every 500 microseconds, When data is collected, it is averaged. Then, 100 sets of averaged average current data and average voltage data are collected. That is, as time passes, as shown in FIG. 4A, 100 pieces of data are scattered to the right in the coordinate system including the current-voltage axis.
[0055]
Then, a linear expression (Y = aX + b) relating to the current and voltage is obtained by the least square method based on the 100 averaged average current data and the 100 average voltage data.
[0056]
Next, an intersection point between a predetermined virtual current value (−10 A) and a straight line (Y = aX + b) is obtained, and a point at which a perpendicular line from the intersection point to the voltage axis intersects the voltage axis is determined as the current 36V battery 11. The estimated voltage (VSOC) corresponding to the remaining capacity is obtained.
[0057]
When the estimated voltage (VSOC) is low, the battery controller 30 sends a charge control signal to the alternator 1 and charges the battery 11 so that the stable 42V can be sufficiently maintained during the next run. Make it.
[0058]
Therefore, in the junction box 10 connecting the load and the two power sources, the control function of the high voltage main relay 19, the control function of the DC-DC converter 28, the control function of the alternator 1, and the remaining capacity measurement function of the battery ( Therefore, it is not necessary to provide a protection circuit for overcurrent protection on the load side, and stable power distribution of the two systems can be performed.
[0059]
In the above embodiment, the overvoltage countermeasure circuit is configured as shown in FIG. 2. However, as shown in FIG. 5, the thermal FET and FET are connected in parallel, and the voltage difference between these sources is detected. Thus, when an overcurrent tendency is detected (for example, a short circuit) and it is determined that a short circuit occurs, these FETs may be forcibly turned off. In addition, when a short circuit occurs, a large current flows through the thermal FET, and the large current causes high heat to turn off the thermal FET.
[0060]
<Embodiment 2>
FIG. 6 is a schematic configuration diagram of the junction box according to the second embodiment. A junction box 50 shown in FIG. 6 includes an overvoltage countermeasure circuit 27 for weak electricity. As shown in FIG. 7, for example, the weak voltage overvoltage countermeasure circuit 27 includes diodes D1 and D2, an electric field capacitor C2, and a Zener diode ZD2. The DC14V output from the DC-DC converter 28 is always maintained at 14V even if the overvoltage exceeds 14V due to abnormalities in the low-voltage battery 13 or load. The low-voltage battery 13, the load, and the DC-DC converter 28 are protected.
[0061]
Further, the junction box 50 is similar to the above-described overvoltage countermeasure circuit 17 for high voltage, the high voltage main relay 19, the current sensor 20, the voltage sensor 21 (insulated type), and the output of the high voltage main relay 19. Are provided with a DC-DC converter 28 that obtains a plurality of types of low voltages by inputting high-voltage first power from the battery controller 30.
[0062]
That is, when the voltage on the battery 13 side and the load side becomes higher than a predetermined voltage due to some abnormality, the overvoltage countermeasure circuit 27 of the weak electric system is configured with a Zener diode or the like as shown in FIG.
[0063]
<Embodiment 3>
FIG. 8 is a schematic configuration diagram of the junction box 52 of the third embodiment. In each of the above embodiments, the current sensor 20 for detecting the current of the battery 36 is provided after the high-voltage main relay 19, but in reality, the current sensor 20 is provided before the overvoltage countermeasure circuit 17 as shown in FIG. The battery 11 and the alternator 1 are preferably provided in series.
[0064]
In this case, the cable 53 from the battery 11 is connected to the connector 54b of the junction box 52. The pattern 54a is fed from the connector 54b and connected to the pattern 18 via the pattern 18b, and the current sensor 20 (Hall element) is connected between the pattern 18a and the pattern 18b (18a and 18b are connected). A built-in non-contact sensor is preferable).
[0065]
The cable 16 from the alternator 1 is connected to the connector 54a, and the pattern 18 is fed from the connector 54a. That is, the electric power generated with the rotation of the alternator 1 is sent to the battery 11 through the cable 16, the connector 54a, the patterns 18, 18b, 18a, and the connector 54b.
[0066]
Further, it is sent to the voltage sensor 21 side via the connector 54, the pattern 18, the overvoltage countermeasure circuit 17, and the high voltage main relay 19.
[0067]
That is, when the battery 11 is charged with power from the alternator 1 side while the high voltage main relay 19 is closed by the relay timing controller circuit 32 of the battery controller 30, the terminal voltage of the battery 11 at that time is the voltage. The sensor 21 detects the charging current and the current sensor 20 detects the charging current.
[0068]
When the battery 11 is discharged, the terminal voltage of the battery 11 is detected by the voltage sensor 21 and the discharge current is detected by the current sensor 20 while the high voltage main relay 19 is closed.
[0069]
At this time, the overvoltage countermeasure circuit 17 suppresses the increased voltage when the input power exceeds the rated voltage (for example, 36 V).
[0070]
The voltage sensor 21 is often a resistance detection type. A voltage is detected by always passing a current through a resistor.
[0071]
However, in the present embodiment, since the voltage sensor 21 is provided at the subsequent stage of the high voltage main relay 19, the high voltage main relay 19 is closed and the voltage can be detected.
[0072]
In other words, since such a voltage sensor 21 is not connected in parallel to the battery 11, when the vehicle enters the garage or the like and is turned off, the current of the battery 11 (also referred to as dark current) is the voltage sensor. Therefore, the power consumption of the battery 11 is suppressed.
[0073]
<Embodiment 4>
FIG. 9 is a schematic configuration diagram of a junction box according to the fourth embodiment. Although the junction box 55 shown in FIG. 9 includes the overvoltage countermeasure circuit 27 for weak electricity, in this case as well, actually, as shown in FIG. 9, the current sensor 20 is provided in front of the overvoltage countermeasure circuit 17, It is preferable to provide the battery 11 and the alternator 1 in series.
[0074]
That is, the cable 53 from the battery 11 is connected to the connector 54 b of the junction box 55. Then, the pattern 18a is fed from the connector 54b and connected to the pattern 18 via the pattern 18b, and the current sensor 20 is provided between the pattern 18a and the pattern 18b (18a and 18b are connected). Is good.
[0075]
The cable 16 from the alternator 1 is connected to the connector 54a, and the pattern 18 is fed from the connector 54a. That is, the electric power generated with the rotation of the alternator 1 is sent to the battery 11 via the cable 16, the connector 54, the patterns 18, 18b, 18a, and the connector 54b, and the connector 54, the pattern 18, the overvoltage countermeasure circuit 17, It is sent to the voltage sensor 21 side via the voltage main relay 19.
[0076]
Instead of the overvoltage countermeasure circuit in the second embodiment, a circuit as shown in FIG. 5 for preventing overcurrent may be provided.
[0077]
In addition, the current integration method described above accumulates the current values of the current sensor 20 and the current sensor 20 every 500 microsecs while the ignition is on, and when the current from the battery is little changed or regeneration by the alternator is performed. When it occurs, the difference between this accumulated current and the full charge capacity is obtained and used as the current remaining capacity. Then, the chargeable amount is determined from the remaining capacity, and if charging is possible, the power from the alternator is charged.
[0078]
That is, the controller of each of the above embodiments has both the above-described current integration function and the remaining capacity calculation function using an approximate line.
[0079]
This remaining capacity calculation function samples every 500 microsec, and averages each when 8 data are collected. Then, 100 sets of averaged average current data and average voltage data are collected, and a linear expression (Y = aX + b) relating to current and voltage is obtained by a least square method based on the 100 averaged current data and voltage data. ) That is, the tendency of 100 data is defined on the current-voltage axis by a straight line (Y = aX + b).
[0080]
Next, an intersection between a predetermined virtual current value (−10 A) and a straight line (Y = aX + b) is obtained, and a point where a perpendicular from the intersection to the voltage axis intersects with the voltage is estimated corresponding to the current remaining capacity. Calculated as voltage (VSOC).
[0081]
【The invention's effect】
As described above, according to the present invention, in the junction box provided between the high voltage battery of the present invention, the low voltage battery that is a predetermined times lower than the high voltage battery, and the load, the high voltage battery When the first power from the battery becomes an overvoltage due to an abnormality such as a load or an alternator, the overvoltage component is removed, and a low charge voltage based on the first power of the high voltage and a plurality of different from the low charge voltage A low voltage of the seed is generated, and the low charging voltage is applied to a low voltage battery provided downstream.
[0082]
At this time, when the high voltage is higher than a predetermined level by the controller, the supply of the high voltage first power is stopped, or the output is stabilized based on the output voltage of the low voltage system unit.
[0083]
Therefore, a protection circuit for overvoltage and overcurrent protection is not required on the load side, and an effect is obtained that stable power can be supplied to the load side.
[0084]
In addition, the battery controller in the junction box combines the remaining capacity of the high-voltage battery and the low-voltage battery with the function for obtaining the remaining capacity using the current integration method and the function of the remaining capacity using an approximate line. Even in a car with a mixture of batteries and low-voltage batteries, the remaining capacity of both batteries in the junction box close to these batteries is optimized according to the current and voltage changes of the batteries. Can be estimated by selecting the appropriate method.
[0085]
For example, when regeneration occurs, charging is performed by determining the chargeable capacity, so that it is possible to efficiently control charging of the alternator to the battery.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a junction box according to a first embodiment.
FIG. 2 is a schematic configuration diagram of an overvoltage countermeasure circuit for high voltage.
FIG. 3 is an explanatory diagram illustrating an example of use of AC output of the DC-DC converter according to the present embodiment.
FIG. 4 is an explanatory diagram illustrating a method for estimating the remaining capacity of two systems of a battery controller.
FIG. 5 is a schematic configuration diagram of an overcurrent protection circuit that replaces an overvoltage countermeasure circuit.
FIG. 6 is a schematic configuration diagram of a junction box according to a second embodiment.
FIG. 7 is a schematic configuration diagram of an overvoltage countermeasure circuit for weak electricity used in the second embodiment.
FIG. 8 is a schematic configuration diagram of a junction box according to a third embodiment.
FIG. 9 is a schematic configuration diagram of a junction box according to a fourth embodiment.
FIG. 10 is an explanatory diagram for explaining a junction box used in a conventional automobile.
[Explanation of symbols]
10 Junction box
11 High voltage battery
13 Low voltage battery
14 Engine
15 cable
16 cable
17 Overvoltage protection circuit for high voltage
19 High voltage main relay
20 Current sensor
21 Voltage sensor
28 DC-DC converter
30 Battery controller

Claims (4)

In a junction box provided between a high-voltage battery, a low-voltage battery that is predetermined times lower than the high-voltage battery, and a load, high-voltage first power from the high-voltage battery is input. Removing the excess component of the first power, and stopping or sending the first power according to the instruction;
High voltage system power component detection means for detecting a first current value and a first voltage value as the first power component in the high voltage system unit;
A switching element is connected in series to the primary side coil, the first power in the high voltage system unit is input to one of the primary side coils, and the first low side is connected to the secondary side by turning on and off the switching element. A second AC power having a voltage AC power and a second DC voltage lower than the first low voltage are obtained, and the AC power and the second DC power are sent directly to the outside, and the low voltage A low voltage system unit including a converter for obtaining a third low voltage third DC power for the battery and supplying the third DC power to the battery ;
Low voltage power component detection means for detecting a current of the third DC power generated by the low voltage system unit;
When the first voltage detected by the high voltage system power component detecting means indicates an overvoltage, the supply of the first power of the high voltage system unit is stopped, and the first voltage generated by the low voltage system unit is generated. A controller for detecting a low current value of the low voltage of the AC power and the second and third DC powers and controlling the low voltage system unit to stabilize these outputs. Intelligent junction box. The controller is
When the first current value detected in the previous SL high-voltage component detection means has indicated an over current, and means for stopping the supply of the first power to the high voltage system unit,
Means for maintaining the switching element of the converter off when the current value of the third power detected by the low voltage system power component detection means indicates an overcurrent;
The intelligent junction box according to claim 1, further comprising: The controller is
Means for inputting the first voltage value and the first current value detected by the high voltage system power component detection means, and collecting the values to estimate the remaining capacity of the high voltage battery by a current integration method; ,
Means for inputting a voltage value and a current value of the third power detected by the low voltage system power detection means, and collecting these values to estimate a remaining capacity of the low voltage battery by a current integration method;
The intelligent junction box according to claim 1, further comprising: The high voltage battery is charged with a high voltage first power from a car alternator;
The controller is
The charge accumulation status of the high voltage battery is determined from the first voltage value detected by the high voltage system power component detection means, and when the charge accumulation status is determined to be less than or equal to a predetermined value, the alternator 4. An intelligent junction box according to claim 1, further comprising means for starting charging of a high voltage battery .

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