Battery electricity taking circuit of low-voltage controller of new energy electric vehicle
By using the EMC processing and soft-start circuit of the DCDC conversion circuit, combined with an integrated driver chip, the complexity of low-voltage power conversion in the 72V battery system is solved, achieving circuit stability and cost reduction.
Patent Information
- Application Number
- CN202422661420.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-11-01
AI Technical Summary
In battery systems of 72V and above, the existing technology has problems such as large transformer size, multiple components and high cost, which makes it difficult to effectively reduce the low-voltage power conversion cost of the motor control system.
It adopts DCDC conversion circuit, performs EMC processing and soft start circuit through input unit, reduces voltage through output unit, integrates driver chip and MOS driver circuit, reduces circuit components, and uses modulated duty cycle DC chopping to convert voltage.
The invention reduces the impact current, improves the circuit stability, reduces the circuit size and cost, and simplifies the low-voltage power conversion process.
Smart Images
Figure CN223443328U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to high -speed electric motor technology field, concretely is a new energy electric vehicle low voltage controller battery power taking circuit. BACKGROUND
[0002] With the demand of electric vehicle to power becomes big, in order to reduce the heat caused by current, some manufacturers promote battery voltage to 72V and above. The main control chip, drive chip etc. in motor control system need low voltage power supply, and it becomes more complex to convert low voltage power supply from 72V. In 72V battery system, voltage is 60-86V, and it exceeds the maximum input voltage for most voltage reduction chip and voltage stabilizing chip. Generally, the power is taken by using flyback power supply, and high voltage is changed into low voltage through the turn ratio of transformer winding.
[0003] In the prior art, the overall volume of the transformer is relatively large, and the flyback power supply uses more devices, so the cost is high. Therefore, the present application provides a new energy electric vehicle low voltage controller battery power taking circuit to solve the above problems. SUMMARY
[0004] The utility model discloses a new energy electric vehicle low voltage controller battery power taking circuit to solve the problem in the background art.
[0005] To achieve the above object, the utility model provides the following technical scheme: a new energy electric vehicle low voltage controller battery power taking circuit, comprising:
[0006] The input unit is used for EMC processing of the electric vehicle battery, and the processed voltage and current are input to the output unit.
[0007] The output unit is used for reducing voltage and outputting.
[0008] The output unit includes L21, the L21 is respectively connected with resistance R8 and resistance R10 in series, the R8 is connected with capacitor C6 in parallel and grounded, the R10 is connected with resistance R18 in parallel, the resistance R10 is connected with inductor L1 and power supply +12V1 connection line, the L1 and +12V1 connection line are connected with resistance R138, the L1 and power supply +12V1 connection line are connected with capacitor C11, C12 and C13 in parallel, the R138 is connected with power supply +12V2, the L1 is connected with L21 through connection line, the L1 connection L21 connection line is connected with diode D1 and grounded, the L1 connection L21 connection line and L21 are connected with capacitor C3 in parallel, the L21 is connected with resistance R108 and grounded in parallel, the resistance R108 is connected with resistance R128 through connection line, and the resistance R128 is connected with input unit through connection line.
[0009] Preferably, the input unit comprises KSI, the KSI is connected with diode D20 in series, the diode D20 is connected with resistance R130, capacitor C1 and resistance R144 in parallel in sequence, the diode D20 is connected with capacitor C53 and C52 in parallel in sequence on the connecting line of L21, the C1 is connected with C53 through connecting line, and the R144 is connected with the connecting line of diode D20 and L21.
[0010] Preferably, the L21 converts the voltage VIN inputted from the third pin of L21 into power voltage 12V through modulating duty cycle direct current chopping, the R108 and R128 form a voltage dividing circuit and are used as the enable end of L21.
[0011] Preferably, the R8, C6, R18 and R10 form a feedback circuit, the R18, R10 and R8 are used for adjusting voltage output, and the C6 is used for frequency compensation.
[0012] Preferably, the D20, R144 and C1 form a soft start circuit, the D20 and R144 are used for charging the capacitor C1, and the R144 is used for limiting the impact current.
[0013] Preferably, the connecting line of diode D20 and L21 is connected with resistance R128, the R130 is grounded, and the KSI.
[0014] Compared with the prior art, the utility model has the beneficial effects that:
[0015] 1. using soft start as the front end of input power supply, reducing impact current and improving circuit stability.
[0016] 2. using integrated drive, concentrating PWM generating chip, MOS drive circuit and MOS together, greatly reducing circuit size and cost. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 It is a battery power taking circuit schematic view of the low-voltage controller of the new energy electric vehicle in the utility model. DETAILED DESCRIPTION
[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.
[0019] Please refer to Figure 1The application discloses a battery power taking circuit of a low-voltage controller of a new energy electric vehicle.
[0020] The input unit and the output unit form a DCDC conversion circuit.
[0021] The input unit is used for EMC processing of the electric vehicle battery, the EMC processing is voltage slow rising processing and impact current reducing processing of the electric vehicle battery, and the processed voltage and current are input to the output unit; the input unit is a power input stage, and the input unit comprises a KSI, a diode D20 connected in series with the KSI, a resistor R130, a capacitor C1 and a resistor R144 connected in parallel with the diode D20 in sequence, a capacitor C53 and a capacitor C52 connected in parallel with a connecting line of the diode D20 and an inductor L21 in sequence, the C1 connected with the C53 through a connecting line, the R144 connected with the connecting line of the diode D20 and the inductor L21, the diode D20, the resistor R144 and the capacitor C1 forming a slow start circuit, the diode D20 and the resistor R144 used for charging the capacitor C1, and the resistor R144 used for limiting impact current, the diode D20 and the inductor L21 connected with a resistor R128, the resistor R130 grounded, the KSI as an input voltage, and the KSI connected with the electric vehicle battery and inputting the voltage to the KSI through the electric vehicle battery.
[0022] The capacitor C1 is charged through the diode D20 and the resistor R144 when the KSI has voltage input, the resistor R144 functions as a current limiter, the capacitor voltage is filled in 3RC time, and impact current does not occur in this process due to current limiting; the slow start is used as a front end of an input power source, impact current is reduced, and circuit stability is improved.
[0023] The output unit is used for voltage reduction and output; the output unit comprises the inductor L21, the inductor L21 is a DCDC control chip, the inductor L21 is connected in series with a resistor R8 and a resistor R10 respectively, the resistor R8 is connected in parallel with a capacitor C6 and grounded, the resistor R10 is connected in parallel with a resistor R18, the resistor R10 is connected with an inductor L1 and a power supply +12V1, the inductor L1 and the power supply +12V1 are connected with a resistor R138, the inductor L1 and the power supply +12V1 are connected in parallel with a capacitor C11, a capacitor C12 and a capacitor C13 in sequence, the resistor R138 is connected with a power supply +12V2, the inductor L1 is connected with the inductor L21 through a connecting line, the inductor L1 is connected with a diode D1 and grounded through a connecting line of the inductor L1 connected with the inductor L21, the connecting line of the inductor L1 connected with the inductor L21 is connected in parallel with a capacitor C3, the inductor L21 is connected in parallel with a resistor R108 and grounded, the resistor R108 is connected with the resistor R128 through a connecting line, and the resistor R128 is connected with the input unit through a connecting line; the inductor L21 converts a voltage VIN input to the third pin of the inductor L21 into a power supply voltage 12V through modulated duty cycle direct current chopping, the resistor R108 and the resistor R128 form a voltage dividing circuit and are used as an enable end of the inductor L21, the resistor R8, the capacitor C6, the resistor R18 and the resistor R10 form a feedback circuit, the resistor R18, the resistor R10 and the resistor R8 are used for adjusting voltage output, and the capacitor C6 is used for frequency compensation.
[0024] When the voltage on R108 is greater than 1.2V, L21 starts to work, the DCDC control chip works, the PWM output is controlled through the feedback voltage, integrated driving is used, the PWM generating chip, the MOS driving circuit and the MOS are concentrated together, and the circuit size and the cost are greatly reduced.
[0025] Although the embodiments of the present application have been shown and described, it should be understood by those ordinary skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.
Claims
1. A new energy electric vehicle low voltage controller battery power circuit, characterized in that: include: An input unit, the input unit being used to perform EMC treatment on the electric vehicle battery and input the treated voltage and current to the output unit; an output unit, the output unit being used to reduce the voltage and output it; The output unit includes L21, and resistors R8 and R10 are respectively connected in series on L21. A capacitor C6 is connected in parallel to R8 and is grounded. A resistor R18 is connected in parallel to R10. The resistor R10 is connected to a connecting line between inductor L1 and power supply +12V1. A resistor R138 is connected to the connecting line between L1 and +12V1. Capacitors C11, C12 and C13 are connected in parallel to the connecting line between L1 and power supply +12V1 in sequence. R138 is connected to power supply +12V2. L1 is connected to L21 through a connecting line. A diode D1 is connected to the connecting line between L1 and L21 and is grounded. A capacitor C3 is connected in parallel to the connecting line between L1 and L21. A resistor R108 is connected in parallel to L21 and is grounded. The resistor R108 is connected to resistor R128 through a connecting line. The resistor R128 is connected to the input unit through a connecting line.
2. The new energy electric vehicle low-voltage controller battery power supply circuit according to claim 1 is characterized in that: The input unit includes KSI, the KSI is connected in series with a diode D20, the diode D20 is sequentially connected in parallel with a resistor R130, a capacitor C1 and a resistor R144, the connecting line between the diode D20 and L21 is sequentially connected in parallel with capacitors C53 and C52, the C1 is connected to C53 through a connecting line, and the R144 is connected to the connecting line between the diode D20 and L21.
3. The new energy electric vehicle low voltage controller battery power supply circuit according to claim 1, characterized in that: The L21 converts the input voltage VIN at the third pin of the L21 into a power supply voltage 12V by modulating the duty cycle of the DC chopper. The R108 and R128 form a voltage divider circuit and serve as the enable terminal of the L21.
4. The new energy electric vehicle low voltage controller battery power supply circuit according to claim 1, characterized in that: The R8, C6, R18, and R10 form a feedback circuit. The R18, R10, and R8 are used to adjust the voltage output, and the C6 is used for frequency compensation.
5. The low-voltage controller battery power supply circuit for new energy electric vehicles according to claim 2, characterized in that: The D20, R144, and C1 form a soft start circuit. The D20 and R144 are used to charge the capacitor C1, and the R144 is used to limit the inrush current.
6. The battery power supply circuit of the low-voltage controller of the new energy electric vehicle according to claim 2 is characterized in that: The connection line between the diode D20 and L21 is connected with a resistor R128, the R130 is grounded, and the KSI.