CN221202522U - Filter circuit of motor controller - Google Patents

Abstract

The utility model provides a filter circuit of motor controller, includes common mode inductance, electric capacity, sets up first filter capacitor between positive and the power negative pole of power, the positive pole of power is connected to the first pin of common mode inductance, the negative pole of power is connected to the second pin, set up bidirectional diode between the first pin of common mode inductance and the second pin, the fourth pin of common mode inductance passes through second filter capacitor ground, and is used for being connected with each functional module circuit's power input through first inductance connection current output, the third pin of common mode inductance passes through third filter capacitor ground respectively, and connects the power negative pole through the second inductance, set up parallelly connected fourth filter capacitor, fifth filter capacitor, sixth filter capacitor between the third pin of common mode inductance and the fourth pin, set up parallelly connected seventh filter capacitor, eighth filter capacitor between power output and the power negative pole, solve motor controller and strongly lead to motor control failure, control trouble's problem.

Description

Filter circuit of motor controller

Technical Field

The utility model relates to the field of motor controllers, in particular to a filter circuit of a motor controller capable of reducing electromagnetic interference.

Background

Along with the development of the automobile industry, the automobile is required to be intelligent, and in order to meet the requirement of high intelligent of the automobile, the automobile motor is often required to meet high voltage and high current, the circuit design of a motor controller for controlling the motor is more and more complex, and the signal interference is also enhanced. Under the environment of high voltage and high current, the motor controller can strengthen EMI (electromagnetic interference), influence the normal operation of the motor and surrounding electrical equipment, and easily cause motor control to have problems or other faults.

At present, in order to solve the EMI of a motor controller, as shown in fig. 3, a CLC filter circuit is generally disposed between a power supply and each functional module circuit of the motor controller, one end of a common-mode inductor of the CLC filter circuit is connected to the power supply, the other end is connected to each functional module circuit needing power supply, and filters the power supply entering each functional module circuit. However, as the power of the motor increases and the requirements of various manufacturers on the performance, the use environment and the like of the motor are improved, the anti-interference requirement of the motor controller is also higher and higher, partial filtering failure can occur in the design of reducing the interference by using the CLC filter circuit and the metal cover, the filtering effect is not ideal, and the design can not meet the EMC (electromagnetic compatibility) requirement of the motor controller; the metal cover is arranged on the circuit board of the motor controller, so that production materials except circuit elements are added, cost reduction and efficiency improvement are not facilitated, and a metal cover space is reserved to influence the space arrangement of the whole controller component; and the metal cover needs to be fixed on the motor controller through the screw, if the metal cover is loosened, the anti-interference capability of the whole motor controller is affected, even the anti-interference failure is caused, and the operation safety and the overall performance of the motor controller are affected. How to solve these problems requires a filter circuit of a motor controller.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art, provides a filter circuit of a motor controller, reduces electromagnetic interference and solves the problems of motor control failure and control failure caused by strong EMI of the motor controller.

The utility model is realized by adopting the following scheme: the utility model provides a filter circuit of motor controller, includes common mode inductance, electric capacity, sets up first filter capacitor between positive and the power negative pole of power, the positive pole of power is connected to the first pin of common mode inductance, the negative pole of power is connected to the second pin, set up two-way diode between the first pin of common mode inductance and the second pin, the fourth pin of common mode inductance passes through second filter capacitor ground, and is used for being connected with each functional module circuit's power input through first inductance connection current output, the third pin of common mode inductance passes through third filter capacitor ground respectively, and connects the power negative pole through the second inductance, set up parallelly connected fourth filter capacitor, fifth filter capacitor, sixth filter capacitor between the third pin of common mode inductance and the fourth pin, set up parallelly connected seventh filter capacitor, eighth filter capacitor between power output and the power negative pole.

Preferably, the bidirectional diode is a transient suppression diode.

Preferably, a ninth filter capacitor is arranged between the first pin and the second pin of the common-mode inductor.

Preferably, the capacity of the fifth filter capacitor is at least an order of magnitude greater than the sixth filter capacitor, and the capacity of the fourth filter capacitor is at least an order of magnitude greater than the fifth filter capacitor.

Preferably, the seventh filter capacitor has a capacity at least an order of magnitude greater than the eighth filter capacitor.

Preferably, the first filter capacitor, the fourth filter capacitor, the fifth filter capacitor, the sixth filter capacitor, the seventh filter capacitor and the eighth filter capacitor are all X capacitors, and the second filter capacitor and the third filter capacitor are Y capacitors.

Preferably, the first inductor and the second inductor are differential mode inductors.

By adopting the technical scheme, the filter circuit of the motor controller comprises a common-mode inductor and a capacitor, wherein a first filter capacitor is arranged between a power anode and a power cathode, a first pin of the common-mode inductor is connected with the power anode, a second pin of the common-mode inductor is connected with the power cathode, a bidirectional diode is arranged between the first pin and the second pin of the common-mode inductor, a fourth pin of the common-mode inductor is grounded through the second filter capacitor and is connected with a power output end through the first inductor and is used for being connected with a power input end of each functional module circuit, a third pin of the common-mode inductor is grounded through a third filter capacitor and is connected with the power cathode through the second inductor, a fourth filter capacitor, a fifth filter capacitor and a sixth filter capacitor which are connected in parallel are arranged between the third pin and the fourth pin of the common-mode inductor, and a seventh filter capacitor and an eighth filter capacitor which are connected in parallel are arranged between the power output end and the power cathode. The common mode inductor is used for inhibiting common mode interference, the circuit is protected through the bidirectional diode, the reliability of the circuit is improved, the first filter capacitor and the ninth filter capacitor are arranged between the common mode inductor and the power supply and used for inhibiting the differential mode interference, the first inductor and the second inductor are arranged between the common mode inductor and the power supply output end and used for inhibiting the differential mode interference, the X capacitor is arranged between the common mode inductor and the first inductor and between the second inductor and the current output end, the differential mode interference is inhibited in a mode of connecting the large capacitor in parallel with the small capacitor, the common mode inductor and the ground through the Y capacitor can inhibit the common mode interference, the filter circuit can well inhibit the electromagnetic interference to meet the requirement of the motor controller on the EMC effect, a metal plate is not required to be additionally arranged for enhancing the EMC filter effect, the cost is effectively saved, meanwhile, the anti-interference effect of the filter circuit is not required to be influenced due to the falling or loosening of the metal plate, and the motor controller is more stable and safe to operate.

The utility model is further described below with reference to the drawings and specific examples.

Drawings

FIG. 1 is a schematic diagram of a circuit structure of the present utility model;

FIG. 2 is a schematic circuit diagram of the present utility model;

FIG. 3 is a schematic diagram of a prior art circuit configuration;

fig. 4 is a schematic diagram of a prior art motor controller.

Detailed Description

Referring to fig. 1 to 2, a filter circuit of a motor controller includes a common mode inductance LCM3, a capacitor, and a differential mode inductance, where the common mode inductance LCM3 is used to suppress common mode interference. The power supply positive pole VCC+ and the power supply negative pole VCC-are connected with an external power supply through a connector P1, and a first filter capacitor C12 is arranged between the power supply positive pole VCC+ and the power supply negative pole VCC-. The first pin 1 of the common-mode inductance LCM3 is connected with the positive pole VCC+ of the power supply, the second pin 2 is connected with the negative pole VCC-of the power supply, a bidirectional diode D82 and a ninth filter capacitor C16 are arranged between the first pin 1 and the second pin 2 of the common-mode inductance LCM3, the bidirectional diode D82 is a transient suppression diode, other components in the circuit can be effectively protected from being affected by excessively high transient voltage, and therefore the reliability of the circuit is improved. The ninth filter capacitor C16 is an X capacitor, and is configured to suppress differential mode interference. The fourth pin 4 of the common-mode inductance LCM3 is grounded GND through a second filter capacitor C64, and is connected to a power output end D0 through a first inductance L3 for connection with a power input end of each functional module circuit, the third pin 3 of the common-mode inductance LCM3 is grounded GND through a third filter capacitor C65, and is grounded VCC-through a second inductance L4 power negative pole, the first inductance L3 and the second inductance L4 are both differential-mode inductances for suppressing differential-mode interference, a fourth filter capacitor C61, a fifth filter capacitor C62 and a sixth filter capacitor C63 which are connected in parallel are arranged between the third pin 3 and the fourth pin 4 of the common-mode inductance LCM3, the capacity of the fifth filter capacitor C62 is at least one order of magnitude greater than that of the sixth filter capacitor C63, and the capacity of the fourth filter capacitor C61 is at least one order of magnitude greater than that of the fifth filter capacitor C62, and the differential-mode interference is effectively suppressed by means of the large capacitor being connected in parallel with the small capacitor; a seventh filter capacitor C66 and an eighth filter capacitor C67 which are connected in parallel are arranged between the power output end D0 and the power negative electrode, the capacity of the seventh filter capacitor C66 is at least an order of magnitude larger than that of the eighth filter capacitor C67, and differential mode interference is restrained in a mode of connecting a large capacitor with a small capacitor in parallel.

In this embodiment, the first filter capacitor C12, the ninth filter capacitor C16, the fourth filter capacitor C61, the fifth filter capacitor C62, the sixth filter capacitor C63, the seventh filter capacitor C66, and the eighth filter capacitor C67 are all X capacitors for suppressing differential mode interference; the second filter capacitor C64 and the third filter capacitor C65 are Y capacitors, and are used for suppressing common mode interference.

In this embodiment, the capacities of the first filter capacitor C12 and the ninth filter capacitor C16 are 1uF, the capacity of the fourth filter capacitor C61 is 1uF, the capacity of the fifth filter capacitor C62 is 10nF, the capacity of the sixth filter capacitor C63 is 1nF, the capacity of the seventh filter capacitor C66 is 10nF, the capacity of the eighth filter capacitor C67 is 1nF, the capacity of the second filter capacitor C64 is 3.3nF, the capacity of the third filter capacitor C65 is 3.3nF, the model of the bidirectional diode D82 is smbj30CAHE3_a/H, the model of the common mode inductor LCM3 is LCV70-701-2PL-TL00, the model of the first inductor L3 is 10uH, the model of the first inductor L3M 100KVN is ETQP M10 uH, the model of the second inductor L4 is ETQP M100KVN.

According to the utility model, the common mode inductance is used for inhibiting common mode interference, the parallel X capacitors are arranged for inhibiting differential mode interference, and the filtering effect is improved by adopting a mode of connecting a large capacitor with a small capacitor in parallel; the Y capacitor is arranged, common mode interference is restrained, the filter circuit simultaneously restrains common mode interference and differential mode interference, the anti-interference capability is strong, the filter effect is good, the filter circuit can obtain good filter effect in the frequency range of 150 kHz-108 MHz, and the filter circuit is suitable for motor controllers with high voltage and high current.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the utility model, and those skilled in the art will appreciate that the modifications made to the utility model fall within the scope of the utility model without departing from the spirit of the utility model.

Claims (7)

1. A filter circuit of a motor controller, comprising a common mode inductance (LCM 3), a capacitance, characterized in that: a first filter capacitor (C12) is arranged between a power anode (VCC+) and a power cathode (VCC-) and is connected with the power anode (VCC+), a second pin (2) is connected with the power cathode, a bidirectional diode (D82) is arranged between the first pin (1) and the second pin (2) of the common-mode inductor (LCM 3), a fourth pin (4) of the common-mode inductor (LCM 3) is Grounded (GND) through a second filter capacitor (C64) and is connected with a current output end (D0) through a first inductor (L3), a third pin (3) of the common-mode inductor (LCM 3) is connected with the Ground (GND) through a third filter capacitor (C65), and is connected with the power cathode (VCC-) through a second inductor (L4), a fourth filter capacitor (C61), a fifth filter capacitor (C62) and a sixth filter capacitor (C67) which are arranged in parallel are arranged between the third pin (3) and the fourth pin (4) of the common-mode inductor (LCM 3), and the eighth filter capacitor (C67) is arranged between the fourth filter capacitor and the eighth filter capacitor (C67).

2. The filter circuit of a motor controller according to claim 1, wherein: the bidirectional diode (D82) is a transient suppression diode.

3. The filter circuit of a motor controller according to claim 1, wherein: a ninth filter capacitor (C16) is arranged between the first pin (1) and the second pin (2) of the common mode inductor (LCM 3).

4. The filter circuit of a motor controller according to claim 1, wherein: the fifth filter capacitor (C62) has a capacity at least one order of magnitude greater than the sixth filter capacitor (C63), and the fourth filter capacitor (C61) has a capacity at least one order of magnitude greater than the fifth filter capacitor (C62).

5. The filter circuit of a motor controller according to claim 1, wherein: the seventh filter capacitor (C66) has a capacity at least an order of magnitude greater than the eighth filter capacitor (C67).

6. The filter circuit of a motor controller according to claim 1, wherein: the first filter capacitor (C12), the fourth filter capacitor (C61), the fifth filter capacitor (C62), the sixth filter capacitor (C63), the seventh filter capacitor (C66) and the eighth filter capacitor (C67) are all X capacitors, and the second filter capacitor (C64) and the third filter capacitor (C65) are Y capacitors.

7. The filter circuit of a motor controller according to claim 1, wherein: the first inductor (L3) and the second inductor (L4) are differential mode inductors.