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WO2018170775A1 - Compteur de quantité électrique, circuit d'étalonnage d'échantillonnage de courant et procédé d'étalonnage - Google Patents

Compteur de quantité électrique, circuit d'étalonnage d'échantillonnage de courant et procédé d'étalonnage Download PDF

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Publication number
WO2018170775A1
WO2018170775A1 PCT/CN2017/077653 CN2017077653W WO2018170775A1 WO 2018170775 A1 WO2018170775 A1 WO 2018170775A1 CN 2017077653 W CN2017077653 W CN 2017077653W WO 2018170775 A1 WO2018170775 A1 WO 2018170775A1
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Prior art keywords
calibration
switch
state signal
fuel gauge
battery
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Ceased
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PCT/CN2017/077653
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English (en)
Chinese (zh)
Inventor
宋汉学
林俊超
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Leadcore Technology Co Ltd
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Leadcore Technology Co Ltd
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Priority to CN201780010235.0A priority Critical patent/CN108966670B/zh
Priority to PCT/CN2017/077653 priority patent/WO2018170775A1/fr
Publication of WO2018170775A1 publication Critical patent/WO2018170775A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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  • the invention mainly relates to a fuel gauge, in particular to a current collection calibration circuit and a calibration method of a fuel gauge.
  • FIG. 1 is an electrical schematic diagram of a conventional fuel gauge.
  • the fuel gauge includes a battery BAT, a switch SW, a resistor Rsense, an amplifier 11, an analog-to-digital converter (ADC) 12, 13, an accumulator 14, and a time base circuit 15.
  • the current is collected by detecting the voltage across the resistor Rsense.
  • the resistor Rsense is a measuring resistor, which is a m ⁇ class current-sense resistor.
  • the resistor RL is the system load.
  • the battery BAT discharges the system load RL by turning on the switch SW.
  • the current loop includes battery BAT, switch SW, resistors Rsense, and RL.
  • the discharge capacity can be expressed as:
  • FIG. 2 is a welded structure of a resistor in the fuel gauge shown in FIG. 1.
  • the resistance of the resistance Rsense is tens of milliohms
  • the welding resistance Rsolder is introduced during soldering.
  • the value of Rsolder sometimes reaches milliohms, so the soldering impedance greatly increases the measurement error. Therefore, the existing fuel gauge has a problem that the current detection result has a large deviation.
  • the resistance itself will have manufacturing variations, and this part of the deviation will also cause deviations in the current measurement results.
  • the technical problem to be solved by the present invention is to provide a current collecting and calibrating circuit in the fuel gauge, which can be used to adjust the error of the measuring resistor, thereby improving the accuracy of the current collecting of the fuel gauge.
  • the present invention provides a current collection calibration circuit in a fuel gauge, including a fuel gauge, including a measurement resistor, a voltage sampler, a power accumulator, and a current collection calibration.
  • a circuit an input end of the voltage sampler is connected to the two ends of the measuring resistor, and an output end of the voltage sampler is connected to the electric quantity accumulator
  • the current collecting and calibrating circuit comprises a battery, a first switch, a second switch, a calibration enabling circuit a current source and a controller, the battery is connected in series with the measuring resistor, and is connected in parallel with the load through the first switch, the first switch is opened and closed by the control of the first state signal; the second switch, the current source And the battery and the measuring resistor are connected in parallel; wherein the calibration enabling circuit generates a second state signal and outputs to the second switch, the second switch is opened and closed by the control of the second state signal; wherein When the two switches are closed, the current source, the battery and the measuring
  • the first status signal is a power on state signal of the device where the fuel gauge is located.
  • the calibration enable circuit generates the second status signal according to a shutdown state signal of the device in which the fuel gauge is located.
  • the calibration enable circuit generates the second state signal according to a shutdown state signal of the device in which the fuel gauge is located, and one of an in-position signal and a power stabilization signal of the battery.
  • the calibration enable circuit further detects a calibration flag and generates the second state signal when the calibration flag is set.
  • the current acquisition calibration circuit further includes a register for storing a calibration resistance value of the measurement resistor, the register being coupled to the controller.
  • the invention also provides a current collecting and calibrating circuit of the fuel gauge, the current collecting and calibrating circuit comprises a battery, a measuring resistor and a voltage sampler, wherein the battery is connected in series with the measuring resistor, and the input end of the voltage sampler is connected to the measuring resistor End, wherein the current collection calibration circuit comprises a battery, a first switch, a second switch, a calibration enable circuit, a current source and a controller, the battery is connected in series with the measuring resistor, and the first switch is connected in parallel with the load, the first a switch is opened and closed by the control of the first state signal, the current source is connected in parallel with the battery and the measuring resistor, and the controller is connected to the voltage sampler; wherein the calibration enabling circuit generates the second The status signal is output to the second switch, and the second switch is opened and closed by the control of the second status signal; wherein when the second switch is closed, the current source, the battery and the measuring resistor form a loop, And the controller is based on the current value of the
  • the calibration enable circuit generates the second status signal according to a shutdown state signal of the device in which the fuel gauge is located.
  • the calibration enable circuit generates the second state signal according to a shutdown state signal of the device in which the fuel gauge is located, and one of an in-position signal and a power stabilization signal of the battery.
  • the calibration enable circuit further detects a calibration flag and generates the second state signal when the calibration flag is not set.
  • the current acquisition calibration circuit further includes a register for storing a calibration resistance value of the measurement resistor, the register being coupled to the controller.
  • the invention also provides a current collecting and calibrating method for a fuel gauge, the fuel gauge comprising a measuring resistor, a voltage sampler, a power accumulator and a current collecting calibration circuit, wherein an input end of the voltage sampler is connected to the two ends of the measuring resistor, An output of the voltage sampler is coupled to the power accumulator, the first switch being opened and closed by the control of the first state signal, the current collection calibration circuit comprising a battery, a first switch, a second switch, and a current source, the battery In series with the measuring resistor, and connected in parallel with the load through the first switch, the second switch, the current source and the battery, the measuring resistor are connected in parallel; wherein the first switch is controlled to be opened and closed by the first state signal The second switch is opened and closed by the control of the second state signal, the method comprising the steps of: providing the second state signal to close the second switch, the current source, the battery and the measuring resistor forming a loop; Calculating a calibration resistance value of the measurement resistor according
  • the first status signal is a power on state signal of the fuel gauge.
  • the second status signal is provided according to a shutdown status signal of the device in which the fuel gauge is located.
  • the second status signal is provided according to a shutdown status signal of the device in which the fuel gauge is located, and one of the in-position signal and the power stabilization signal of the battery.
  • the method includes: after obtaining the calibration resistance value, setting a calibration flag, wherein the calibration flag is detected, and the second is generated when the calibration flag is not set. Status signal.
  • the calibration flag when the calibration flag is not set, if the power-on vector of the device where the fuel gauge is located is received, the second state signal is still provided, and the booting process is suspended.
  • the above-mentioned fuel gauge and the current calibration circuit thereof eliminate the error of the mounting and the resistor itself by calibrating the actual value after the precision resistor is mounted, and write the calibration value into the register of the battery voltage domain, and call the normal operation. The value is calculated to optimize the fuel gauge calculation accuracy.
  • the current calibration method of the above embodiment of the present invention ensures the timing of calibration and the timing of power calculation by the strict process design, which ensures the accuracy of calibration and the accuracy of current calculation.
  • Figure 1 is an electrical schematic diagram of a conventional fuel gauge.
  • FIG. 2 is a welded structure of a resistor in the fuel gauge shown in FIG. 1.
  • FIG. 3 is an electrical schematic diagram of a fuel gauge according to an embodiment of the present invention.
  • FIG. 4 is an electrical schematic diagram of a fuel gauge according to another embodiment of the present invention.
  • Fig. 5 is an electrical schematic diagram of a fuel gauge according to still another embodiment of the present invention.
  • FIG. 6 is a flow chart of a current collection calibration method according to an embodiment of the present invention.
  • FIG. 7 is a flow chart of a current collection calibration method according to another embodiment of the present invention.
  • FIG. 8 is a flow chart of a current collection calibration method according to still another embodiment of the present invention.
  • Embodiments of the present invention describe a current acquisition calibration circuit and a calibration method in a fuel gauge for modifying the error of the measured resistance, particularly the error introduced by the resistor during mounting and the error of the resistor itself.
  • the fuel gauge of the present invention can be used to measure battery capacity, and thus can be widely used in various portable electronic devices.
  • the fuel gauge 30 of the present embodiment includes a measurement resistor Rsense, an amplifier 31, an analog-to-digital converter (ADC) 32, 33, an accumulator 34, a time base circuit 35, a current source 36, and a calibration.
  • the circuit 40 is enabled.
  • the amplifier 31 and the ADC 33 form a voltage sampler.
  • the input of the amplifier 31 is connected to both ends of the measuring resistor Rsense, and the output terminal is connected to the input terminal of the ADC 33.
  • the output of ADC 33 is coupled to accumulator 34.
  • the accumulator 34 and the time reference circuit 35 constitute a power accumulator.
  • the current collection calibration circuit 40 includes a battery BAT, a first switch SW1, a second switch SW2, a calibration enable circuit 41, a current source 42, and a controller 43.
  • the battery BAT is connected in series with the measuring resistor Rsense and in parallel with the load RL through the first switch SW1.
  • the second switch SW2, the current source 42 and the battery BAT, and the measuring resistor Rsense are connected in parallel.
  • the nominal resistance of the measuring resistor Rsense is Rsense, however due to the introduction of the welding resistance value Rsolder, the actual resistance value Rsns is the sum of Rsense and Rsolder. Further, considering the difference between the actual value Rsense' of the measuring resistor Rsense and the nominal value, the actual resistance value Rsns is the sum of Rsense' and Rsolder.
  • Current source 42 has a current Ical. In order to ensure the accuracy of the calibration, Ical needs to be stable and has a low error. For example, the error of Ical is ⁇ 1%.
  • the fuel gauge of this embodiment has two states of power calculation and resistance calibration.
  • a first state signal and a second state signal are provided, respectively corresponding to the two states, for controlling the first switch SW1 and the second switch SW2.
  • the power calculation is usually performed after the device where the fuel gauge is turned on. Therefore, the power-on state signal of the device where the fuel gauge is located is selected as the first state signal, and is supplied to the first switch SW1.
  • the first switch SW1 is turned off and closed by the control of the power-on state signal, that is, when the power-on state signal display device is turned on, the first switch SW1 is closed, otherwise the first switch SW1 is turned off.
  • the accuracy of the calibration can be ensured.
  • the shutdown state signal of the device where the fuel gauge is located is selected as the second state signal and is supplied to the second switch SW2.
  • the calibration enable circuit 41 generates a second state signal according to the off state and outputs it to the second switch SW2.
  • the second switch SW2 is turned off and closed by the control of the second state signal, that is, when the shutdown state signal display device is turned off, the second switch SW2 is closed, otherwise the second switch SW2 is turned off.
  • the current source 42, the battery BAT and the measuring resistor Rsense are composed Loop.
  • a voltage sampler consisting of amplifier 31 and ADC 33 will acquire the voltage Vcal across the measurement resistor Rsense.
  • the controller 43 can calculate the electric quantity by using the calibration resistance value, and the process of calculating the electric quantity is already an existing technology, and is not expanded here.
  • a register 44 is provided for storing the calibration resistance value.
  • Register 44 is coupled to controller 43 so that controller 43 can access register 44.
  • REGcal can be called from the register 44 to calculate the power.
  • the fuel gauge 30 of the present embodiment includes a measurement resistor Rsense, an amplifier 31, an analog-to-digital converter (ADC) 32, 33, an accumulator 34, a time base circuit 35, a current source 36, and a calibration.
  • the circuit 40 is enabled.
  • the amplifier 31 and the ADC 33 form a voltage sampler.
  • the input of the amplifier 31 is connected to both ends of the measuring resistor Rsense, and the output terminal is connected to the input terminal of the ADC 33.
  • the output of ADC 33 is coupled to accumulator 34.
  • the accumulator 34 and the time reference circuit 35 constitute a power accumulator.
  • the current collection calibration circuit 40 includes a battery BAT, a first switch SW1, a second switch SW2, a calibration enable circuit 41, a current source 42, and a controller 43.
  • the battery BAT is connected in series with the measuring resistor Rsense and in parallel with the load RL through the first switch SW1.
  • the second switch SW2, the current source 42 and the battery BAT, and the measuring resistor Rsense are connected in parallel.
  • the nominal resistance of the measuring resistor Rsense is Rsense, however due to the introduction of the welding resistance value Rsolder, the actual resistance value Rsns is the sum of Rsense and Rsolder. Further, considering the difference between the actual value Rsense' of the measuring resistor Rsense and the nominal value, the actual resistance value Rsns is the sum of Rsense' and Rsolder.
  • Current source 42 has a current Ical. In order to ensure the accuracy of the calibration, Ical needs to be stable and has a low error. For example, the error of Ical is ⁇ 1%.
  • the fuel gauge of this embodiment has two states of power calculation and resistance calibration.
  • a first state signal and a second state signal are provided, respectively corresponding to the two states, for controlling the first switch SW1 and the second switch SW2.
  • the power calculation is usually performed after the device where the fuel gauge is turned on. Therefore, the power-on state signal of the device where the fuel gauge is located is selected as the first state signal, and is supplied to the first switch SW1.
  • the first switch SW1 is turned off and closed by the control of the power-on state signal, that is, when the power-on state signal display device is turned on, the first switch SW1 is closed, otherwise the first switch SW1 is turned off.
  • the device where the fuel gauge is located is turned off
  • the shutdown state signal of the device where the fuel gauge is located is selected as the second state signal and supplied to the second switch SW2.
  • the present embodiment is different from the previous embodiment in that the calibration enable circuit 41 generates a second state signal based on the battery in-position signal and the off-state signal.
  • the calibration enable circuit 41 can be implemented as an AND gate. In other words, calibration is only performed when the battery is in place and the device where the fuel gauge is located is off.
  • the battery in-position signal can be replaced with a power supply stabilization signal, that is, calibration is performed only when the power supply is stable and the device in which the fuel gauge is located is off.
  • Fig. 5 is an electrical schematic diagram of a fuel gauge according to still another embodiment of the present invention.
  • the fuel gauge 30 of the present embodiment includes a measurement resistor Rsense, an amplifier 31, an analog-to-digital converter (ADC) 32, 33, an accumulator 34, a time base circuit 35, a current source 36, and a calibration.
  • the circuit 40 is enabled.
  • the amplifier 31 and the ADC 33 form a voltage sampler.
  • the input of the amplifier 31 is connected to both ends of the measuring resistor Rsense, and the output terminal is connected to the input terminal of the ADC 33.
  • the output of ADC 33 is coupled to accumulator 34.
  • the accumulator 34 and the time reference circuit 35 constitute a power accumulator.
  • the current collection calibration circuit 40 includes a battery BAT, a first switch SW1, a second switch SW2, a calibration enable circuit 41, a current source 42, and a controller 43.
  • the battery BAT is connected in series with the measuring resistor Rsense and in parallel with the load RL through the first switch SW1.
  • the second switch SW2, the current source 42 and the battery BAT, and the measuring resistor Rsense are connected in parallel.
  • the nominal resistance of the measuring resistor Rsense is Rsense, however due to the introduction of the welding resistance value Rsolder, the actual resistance value Rsns is the sum of Rsense and Rsolder. Further, considering the difference between the actual value Rsense' of the measuring resistor Rsense and the nominal value, the actual resistance value Rsns is the sum of Rsense' and Rsolder.
  • Current source 42 has a current Ical.
  • Ical In order to ensure the accuracy of the calibration, Ical needs to be stable and has a low error. For example, the error of Ical is ⁇ 1%.
  • the value of the current Ical can be set to 100 mA or hundreds of mA, as needed.
  • the fuel gauge of this embodiment has two states of power calculation and resistance calibration.
  • a first state signal and a second state signal are provided, respectively corresponding to the two states, for controlling the first switch SW1 and the second switch SW2.
  • the power calculation is usually performed after the device where the fuel gauge is turned on. Therefore, the power-on state signal of the device where the fuel gauge is located is selected as the first state signal, and is supplied to the first switch SW1.
  • the first switch SW1 is turned off and closed by the control of the power-on state signal, that is, when the power-on state signal display device is turned on, the first switch SW1 is closed, otherwise the first switch SW1 is turned off.
  • the accuracy of the calibration can be ensured.
  • the present embodiment differs from the previous embodiment in that the current acquisition calibration circuit 40 further includes a register 45 that holds a calibration flag. After the controller 43 obtains the calibration resistance value, the calibration flag is set (eg, set to 1). The calibration enable circuit 41 first detects the calibration flag bit, and when the calibration flag bit is not set, generates a second state signal based on the battery in-position signal and the off-state signal. At this time, the calibration enable circuit 41 can be implemented as an AND gate having three signal inputs. That is to say, calibration is performed only when the calibration is not performed, the battery is in place, and the device where the fuel gauge is located is turned off.
  • the battery in-position signal can be replaced with a power supply stabilization signal, that is, calibration is performed only when the power supply is stable and the device in which the fuel gauge is located is off.
  • FIG. 6 is a flow chart of a current collection calibration method according to an embodiment of the present invention. Referring to FIG. 6, when the current management calibration method of the embodiment is in the power-on reset state, the following steps are performed:
  • step 61 it is detected whether the device where the fuel gauge is located is in a shutdown state, and if yes, proceeds to step 62, otherwise continues to wait;
  • step 62 it is determined whether there is a boot vector, if yes, proceed to step 66, otherwise proceed to step 63; where the boot vector is an event that can cause the device of the fuel gauge to be powered on, such as pressing a power button, starting charging, etc.;
  • step 63 the resistance value calibration is performed;
  • the specific calibration process can refer to the foregoing embodiment, and is not expanded here;
  • the calibration resistor value is written to the register
  • step 65 it is determined again whether there is a boot vector, if yes, proceed to step 66, otherwise continue to wait;
  • step 66 the power is turned on, and the fuel gauge performs a power calculation
  • step 67 the value of the register is called for calculation when performing the power calculation
  • the power calculation is performed cyclically.
  • FIG. 7 is a flow chart of a current collection calibration method according to another embodiment of the present invention. Referring to FIG. 7, when the current management calibration method of the embodiment is in the power-on reset state, the following steps are performed:
  • step 71 it is detected whether the device where the fuel gauge is located is in a shutdown state, and if yes, proceeds to step 62, otherwise continues to wait;
  • step 72 it is determined whether the calibration flag is 1, if it is 1 indicating that the calibration has been performed, proceeds to step 73, otherwise proceeds to step 74;
  • step 73 it is determined whether there is a boot vector, if yes, proceed to step 77, otherwise continue to wait; where the boot vector is an event that can cause the device of the fuel gauge to be powered on, such as pressing a power button, starting charging, etc.;
  • step 74 the resistance value calibration is performed;
  • the specific calibration process can refer to the foregoing embodiment, and is not expanded here;
  • the calibration resistance value is written to the register and the calibration flag is set
  • step 76 it is determined again whether there is a boot vector, if yes, proceed to step 66, otherwise continue to wait;
  • step 77 the power is turned on, and the fuel gauge performs a power calculation
  • step 78 the value of the register is called for calculation when performing the power calculation
  • the power calculation is performed cyclically.
  • FIG. 8 is a flow chart of a current collection calibration method according to still another embodiment of the present invention.
  • the current collection calibration method of the embodiment is that when the power management chip is in the power-on reset state, the following steps are performed:
  • step 81 it is determined whether the battery is in place, if yes, then proceeds to step 83, otherwise proceeds to step 82;
  • step 82 it is determined whether the power supply is stable, if yes, then proceeds to step 83, otherwise returns to step 81;
  • step 83 it is detected whether the device where the fuel gauge is located is in a shutdown state, and if yes, proceeds to step 84, otherwise continues to wait;
  • step 84 it is determined whether the calibration flag is 1, if it is 1 indicates that the calibration has been performed, proceeds to step 85, otherwise proceeds to step 86;
  • step 85 it is determined whether there is a boot vector, if yes, proceed to step 89, otherwise continue to wait; where the boot vector is an event that can cause the device of the fuel gauge to be powered on, such as pressing a power button, starting charging, etc.;
  • the resistance value calibration is performed; the specific calibration process can refer to the foregoing embodiment, and is not expanded here;
  • the calibration resistance value is written to the register and the calibration flag is set;
  • step 88 it is again determined whether there is a boot vector present, if yes, then proceeds to step 66, otherwise Continue to wait;
  • step 89 the power is turned on, and the fuel gauge performs a power calculation
  • the value of the register is called for calculation when performing the power calculation
  • the power calculation is performed cyclically.
  • the embodiment shown in Fig. 7 can be further optimized to the embodiment shown in Fig. 9.
  • the current collection calibration method of the embodiment is that when the power management chip is in the power-on reset state, the following steps are performed:
  • step 1001 it is detected whether the device where the fuel gauge is located is in a shutdown state, and if yes, proceeds to step 62, otherwise continues to wait;
  • step 1002 it is determined whether the calibration flag is 1, if it is 1 indicating that the calibration has been performed, proceeds to step 1003, otherwise proceeds to step 1004;
  • step 1003 it is determined whether there is a boot vector, if yes, proceed to step 1011, otherwise continue to wait; where the boot vector is an event that can cause the device of the fuel gauge to be powered on, such as pressing a power button, starting charging, etc.;
  • step 1004 it is determined whether there is a boot vector exists, if yes, then proceeds to step 1008, otherwise proceeds to step 1005;
  • step 1005 the resistance value calibration is performed; the specific calibration process can refer to the foregoing embodiment, and is not expanded here;
  • step 1006 the calibration resistance value is written to the register and the calibration flag is set
  • step 1007 it is determined again whether there is a boot vector, if yes, proceed to step 66, otherwise continue to wait;
  • step 1008 performing a resistance value calibration
  • step 1009 a boot process is performed
  • the calibration resistance value is written to the register and the calibration flag is set
  • step 1011 the power is turned on, and the fuel gauge performs a power calculation
  • step 1012 the value of the register is called when performing the power calculation
  • the power calculation is performed cyclically.
  • step 1004 when it is determined in step 1004 that the boot vector exists, the boot process is not immediately executed, but the predetermined time (for example, 100 ms) is delayed, and the resistance value calibration is performed in step 1008 for a predetermined time, and then the boot process is executed in step 1009. .
  • the predetermined time for example, 100 ms
  • the fuel gauge and the current calibration circuit of the above embodiment of the present invention eliminate the error of the mounting and the resistor itself by calibrating the actual value after the precision resistor is mounted, and write the calibration value into the register of the battery voltage domain, during normal operation. This value is called for power calculation, which optimizes the calculation accuracy of the fuel gauge.
  • the current calibration method of the above embodiment of the present invention ensures the timing of calibration and the timing of power calculation by the strict process design, which ensures the accuracy of calibration and the accuracy of current calculation.

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Abstract

La présente invention concerne un compteur de quantité électrique, un circuit d'étalonnage d'échantillonnage de courant associé et un procédé d'étalonnage. Le compteur de quantité électrique (30) comprend une résistance de détection (Rsense), un échantillonneur de tension et un circuit d'étalonnage d'échantillonnage de courant. Une extrémité d'entrée de l'échantillonneur de tension est connectée aux deux extrémités de la résistance de détection (Rsense). Le circuit d'étalonnage d'échantillonnage de courant comprend une batterie (BAT), un premier commutateur (SW1), un second commutateur (SW2), un circuit d'activation d'étalonnage (41), une source de courant (42) et un dispositif de commande (43). Le second commutateur (SW2) et la source de courant (42) sont connectés à la batterie (BAT) et à la résistance de détection (Rsense) en parallèle. Le circuit d'activation d'étalonnage (41) génère et délivre un second signal d'état au second commutateur (SW2). Quand le second commutateur (SW2) est fermé, la source de courant (42), la batterie (BAT) et la résistance de détection (Rsense) forment un circuit, et le dispositif de commande (43) calcule une valeur de résistance d'étalonnage de la résistance de détection (Rsense) en fonction d'une valeur de courant de la source de courant (42) et d'une valeur d'échantillonnage de l'échantillonneur de tension. Quand le premier commutateur (SW1) est fermé, la batterie (BAT), la résistance de détection (Rsense) et une charge (RL) forment un circuit, et le dispositif de commande (43) calcule une quantité d'électricité en fonction de la valeur de résistance d'étalonnage.
PCT/CN2017/077653 2017-03-22 2017-03-22 Compteur de quantité électrique, circuit d'étalonnage d'échantillonnage de courant et procédé d'étalonnage Ceased WO2018170775A1 (fr)

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CN201780010235.0A CN108966670B (zh) 2017-03-22 2017-03-22 电量计及其电流采集校准电路和校准方法
PCT/CN2017/077653 WO2018170775A1 (fr) 2017-03-22 2017-03-22 Compteur de quantité électrique, circuit d'étalonnage d'échantillonnage de courant et procédé d'étalonnage

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CN115133833A (zh) * 2022-07-29 2022-09-30 江苏爱玛车业科技有限公司 电机控制器的母线电流自动校准方法和装置

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