CN111224378A - DC motor sampling overcurrent protection circuit - Google Patents
DC motor sampling overcurrent protection circuit Download PDFInfo
- Publication number
- CN111224378A CN111224378A CN201811427846.8A CN201811427846A CN111224378A CN 111224378 A CN111224378 A CN 111224378A CN 201811427846 A CN201811427846 A CN 201811427846A CN 111224378 A CN111224378 A CN 111224378A
- Authority
- CN
- China
- Prior art keywords
- voltage
- resistor
- overcurrent protection
- unit
- bias
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005070 sampling Methods 0.000 title claims abstract description 25
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims description 25
- 238000001914 filtration Methods 0.000 claims description 23
- 230000003321 amplification Effects 0.000 claims 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 4
- 230000003750 conditioning effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000001143 conditioned effect Effects 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a direct current motor sampling overcurrent protection circuit, which comprises three phase current conversion parts, wherein each phase current conversion part is used for converting one phase current of corresponding U, V, W three-phase currents into phase voltage signals which can be detected by a software overcurrent protection unit and a voltage comparison unit; and the software overcurrent protection unit detects whether the corresponding phase current is in overcurrent or not according to the received phase voltage signal. The invention has the beneficial effects that: (1) the ability to separately monitor U, V, W the three-phase currents; (2) the circuit cost is reduced.
Description
Technical Field
The invention relates to the field of circuit detection, in particular to a sampling overcurrent protection circuit of a direct current motor.
Background
When the direct current motor is driven and controlled, phase current detection needs to be carried out on the motor to prevent damage to a circuit due to overcurrent.
The invention with the publication number of CN107528295A provides a three-phase protection circuit and a method for VSC, which can protect overcurrent, overvoltage, undervoltage and open phase. The three-phase protection circuit comprises a three-phase conditioning circuit and a comparison protection circuit; the input end of the comparison protection circuit is connected with the three-phase conditioning circuit, and the output end of the comparison protection circuit outputs a protection action signal FAULT. The method comprises the following steps: converting the collected three-phase signals into alternating current signals which can be accepted by the control panel; after the three-phase alternating current signal passes through the three-phase conditioning circuit, the output signal is a six-pulse wave signal with only positive value, and the six-pulse wave signal comprises six peak waves of positive and negative of the three-phase signal in one period; the conditioned six-pulse wave signals are connected to the positive end and the negative end of a comparison protection circuit, a first potentiometer and a second potentiometer are adjusted, and respective protection thresholds are set; the comparison protection circuit outputs a protection action signal FAULT which is connected with the enabling end of the level conversion chip of the PWM signal. In the method, a three-phase signal needs to be converted into an alternating current signal which can be accepted by a control board, and a six-pulse wave signal is obtained through the alternating current signal, so that the expected effect of a protection circuit can be achieved, but the technical scheme and the connection structure are relatively complex.
In view of this, it is desirable to design a simple three-resistor sampling overcurrent protection circuit so as to reduce the circuit cost while ensuring separately monitoring U, V, W three-phase currents.
Disclosure of Invention
An object of the present invention is to provide a dc motor sampling overcurrent protection circuit, which can reduce the circuit cost while ensuring separately monitoring U, V, W three-phase currents.
Specifically, the invention is realized by the following technical scheme:
a DC motor sampling overcurrent protection circuit comprises three phase current conversion parts, wherein each phase current conversion part is used for converting one phase current of corresponding U, V, W three-phase currents into phase voltage signals which can be detected by a software overcurrent protection unit and a voltage comparison unit, each phase voltage signal is connected into the corresponding software overcurrent protection unit on one hand and is connected into the voltage comparison unit on the other hand, the voltage comparison unit is used for detecting whether the sum of the input phase voltage signals exceeds a preset voltage threshold value or not, and if yes, a protection signal is sent to a hardware overcurrent protection port; and the software overcurrent protection unit detects whether the corresponding phase current is in overcurrent or not according to the received phase voltage signal.
Preferably, the phase current converting part includes a single-phase current input terminal, a current-voltage converting unit, and a voltage amplifying unit, and the single-phase current input terminal, the current-voltage converting unit, and the voltage amplifying unit are connected in sequence.
Preferably, the voltage amplifying unit and the software overcurrent protection unit are further connected with a first filtering unit, and the first filtering unit is configured to filter the amplified first voltage signal to filter a harmonic wave existing in the amplified first voltage signal.
Preferably, the current-voltage conversion unit includes a first operational amplifier, a non-inverting input terminal of the first operational amplifier is connected to a bias voltage, a first bias resistor is connected in series between the bias voltage and the non-inverting input terminal, one end of a second bias resistor is connected to a line between the first bias resistor and the non-inverting input terminal, and the other end of the second bias resistor is grounded; the non-inverting input end is further connected with the single-phase current input end, the inverting input end of the first operational amplifier is connected with the first gain resistor in series and then grounded, one end of the second gain resistor is connected with the inverting input end of the first operational amplifier, and the other end of the second gain resistor is connected with the output end of the first operational amplifier.
Preferably, a second voltage-dividing resistor is further connected in series between the non-inverting input terminal and the single-phase current input terminal, one end of the first voltage-dividing resistor is connected to a line between the second resistor and the non-inverting input terminal, and the other end of the first voltage-dividing resistor is grounded.
Preferably, the first filtering unit includes a first filtering resistor and a first filtering capacitor, one end of the first filtering resistor is connected to the output end of the first operational amplifier, the other end of the first filtering resistor is connected to the software overcurrent protection unit, one end of the first filtering capacitor is connected to a line between the first filtering resistor and the software overcurrent protection unit, and the other end of the first filtering capacitor is grounded.
Preferably, a lead is led out from the output end of the first operational amplifier and connected to a voltage comparison unit, the voltage comparison unit includes a comparator, and the output end of the first operational amplifier is connected to a positive input port of the comparator through a lead.
Preferably, a voltage dividing unit is further disposed at the positive input port of the comparator, the voltage dividing unit includes a fourth voltage dividing resistor and a third voltage dividing resistor, one end of the fourth voltage dividing resistor is connected to the positive input port of the comparator, the other end of the fourth voltage dividing resistor is connected to the cathode of the buck diode, one end of the third voltage dividing resistor is connected to the positive input port of the comparator, and the other end of the third voltage dividing resistor is grounded; the second filter capacitor is connected in parallel with the third voltage dividing resistor.
Preferably, a bias voltage is connected to the negative input port of the comparator, a voltage-dividing overcurrent protection circuit is further connected to a line between the bias voltage and the negative input port of the comparator, the voltage-dividing overcurrent protection circuit includes a third bias resistor, a fourth bias resistor and a third filter capacitor, the third bias resistor is connected in series to the line between the bias voltage and the negative input port of the comparator, one end of the fourth bias resistor is connected to the line between the third bias resistor and the negative input port of the comparator, the other end of the fourth bias resistor is grounded, and the third filter capacitor and the fourth bias resistor are connected in parallel.
Preferably, an output port of the comparator is connected with a bias voltage, a pull-up resistor is further connected to the bias voltage, one end of a fifth voltage-dividing resistor is connected with the hardware overcurrent protection port, the other end of the fifth voltage-dividing resistor is connected with the output port of the comparator, one end of a sixth voltage-dividing resistor is connected with the hardware overcurrent protection port, and the other end of the sixth voltage-dividing resistor is grounded; and the fourth filter capacitor is connected with the sixth divider resistor in parallel.
The invention has the beneficial effects that: (1) the ability to separately monitor U, V, W the three-phase currents; (2) the circuit cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of an overall structure of a dc motor sampling overcurrent protection circuit provided by the present invention;
FIG. 2 is a schematic diagram of a specific structure of a phase current converting part;
fig. 3 is a schematic structural diagram of a dc motor sampling overcurrent protection circuit provided by the present invention.
Description of the reference numerals
To further clarify the structure and connection between the various components of the present invention, the following reference numerals are given and described.
A first operational amplifier IC 1A; a bias voltage VCC; a first bias resistor R5; a second bias resistor R6; a first voltage dividing resistor R1; a second voltage dividing resistor R4; a first gain resistor R2; a second gain resistor R3; a first filter resistance R7; a first filter capacitor C1; a comparator IC 2B; a third voltage dividing resistor R25; a fourth voltage dividing resistor R22; a step-down diode D1; a second filter capacitor C5; a third bias resistor R23; a fourth bias resistor R24; a third filter capacitor C4; pull-up resistor R26; a fifth voltage-dividing resistor R27; and a sixth voltage-dividing resistor R28.
The technical scheme of the invention can be more clearly understood and explained by combining the embodiment of the invention through the reference sign description.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
The present invention will be described in detail below by way of examples.
A DC motor sampling overcurrent protection circuit is shown in figure 1, the protection circuit comprises three phase current conversion parts, namely a U-phase current converting part, a V-phase current converting part and a W-phase current converting part which are respectively used for detecting U, V, W three-phase currents, each phase current converting part is used for converting one phase current in the corresponding U, V, W three-phase currents into phase voltage signals which can be detected by a software overcurrent protection unit and a voltage comparison unit, each phase voltage signal is connected into the corresponding software overcurrent protection unit on one hand and is connected into the voltage comparison unit on the other hand, namely, the voltage comparison unit receives U, V, W the summation of the converted phase voltage signals of each phase of the three-phase current, the voltage comparison unit is used for detecting whether the sum of the input phase voltage signals exceeds a preset voltage threshold value, and if so, the voltage comparison unit sends a protection signal to the hardware overcurrent protection port.
Specifically, the phase current converting part comprises a single-phase current input end, a current-voltage converting unit and a voltage amplifying unit, the single-phase current input end, the current-voltage converting unit and the voltage amplifying unit are sequentially connected, a current of a certain phase is input into the phase current converting part through the single-phase current input end, then the single-phase current passes through the current-voltage converting unit, a current signal input into the single-phase current input end is converted into a first voltage signal corresponding to the single-phase current signal, and then the first voltage signal is amplified by the voltage amplifying unit to generate a second voltage signal with a size suitable for a subsequent software overcurrent protection unit and a voltage comparing unit, so that the subsequent software overcurrent protection unit and the voltage comparing unit can perform corresponding detection.
Further, a first filtering unit is connected between the voltage amplifying unit and the software overcurrent protection unit, and the first filtering unit is used for filtering the amplified first voltage signal so as to filter harmonic waves existing in the amplified first voltage signal.
Further, as shown in fig. 2 and fig. 3, the current-voltage conversion unit includes a first operational amplifier IC1A, a non-inverting input terminal of the first operational amplifier IC1A is connected to a bias voltage VCC, a first bias resistor R5 is connected in series between the bias voltage VCC and the non-inverting input terminal, one end of a second bias resistor R6 is connected to a line between the first bias resistor R5 and the non-inverting input terminal, and the other end is grounded; the non-inverting input end is further connected with the single-phase current input end, a second voltage-dividing resistor R4 is further connected in series between the non-inverting input end and the single-phase current input end, one end of the first voltage-dividing resistor R1 is connected to a line between the second resistor R4 and the non-inverting input end, and the other end of the first voltage-dividing resistor R1 is grounded. The inverting input terminal of the first operational amplifier IC1A is connected in series with the first gain resistor R2 and then grounded, and one end of the second gain resistor R3 is connected to the inverting input terminal of the first operational amplifier IC1A, and the other end is connected to the output terminal of the first operational amplifier IC 1A.
The first filtering unit comprises a first filtering resistor R7 and a first filtering capacitor C1, one end of the first filtering resistor R7 is connected with the output end of the first operational amplifier IC1A, the other end of the first filtering resistor R7 is connected with the software overcurrent protection unit, one end of the first filtering capacitor C1 is connected with a line between the first filtering resistor R7 and the software overcurrent protection unit, and the other end of the first filtering capacitor C1 is grounded.
Further, the software overcurrent protection unit may be a functional program module set in the main control MCU for software overcurrent protection, and the amplified first voltage signal is actually accessed to an AD sampling interface on the main control MCU.
Specifically, a lead is led out from an output end of the first operational amplifier IC1A to connect with a voltage comparison unit, further, the voltage comparison unit includes a comparator IC2B, an output end of the first operational amplifier IC1A is connected with a positive input port of the comparator IC2B through a lead, and a buck diode D1 is further connected in series on a line between the output end of the first operational amplifier IC1A and the comparator IC 2B.
Further, on the positive input port of comparator IC2B, a voltage dividing unit is further provided, the voltage dividing unit includes a fourth voltage dividing resistor R22 and a third voltage dividing resistor R25, one end of the fourth voltage dividing resistor R22 is connected with the positive input port of comparator IC2B, the other end is connected with the cathode of buck diode D1, one end of the third voltage dividing resistor R25 is connected with the positive input port of comparator IC2B, and the other end is grounded. Further, a second filter capacitor C5 is disposed in parallel with the third voltage dividing resistor R25. On one hand, the fourth voltage dividing resistor R22 and the third voltage dividing resistor R25 form a voltage dividing circuit, which divides the voltage entering the positive input port of the comparator IC2B, and avoids the failure of the comparator IC2B caused by the fact that the voltage entering the positive input port of the comparator IC2B is greater than the bias voltage VCC connected to the comparator IC 2B; on the other hand, the third voltage dividing resistor R25 and the second filter capacitor C5 form an RC filter circuit, which functions to filter out high frequency noise entering the comparator IC2B, so that the judgment result of the comparator IC2B is more accurate.
Further, a bias voltage VCC is connected to the negative input port of the comparator IC2B, a voltage-dividing overcurrent protection circuit is further connected to a line between the bias voltage VCC and the negative input port of the comparator IC2B, specifically, the voltage-dividing overcurrent protection circuit includes a third bias resistor R23, a fourth bias resistor R24 and a third filter capacitor C4, the third bias resistor R23 is connected in series to the line between the bias voltage VCC and the negative input port of the comparator IC2B, one end of the fourth bias resistor R24 is connected to the line between the third bias resistor R23 and the negative input port of the comparator IC2B, the other end of the fourth bias resistor R24 is grounded, and the third filter capacitor C4 and the fourth bias resistor R24 are connected in parallel.
An output port of the comparator IC2B is connected with a bias voltage VCC, a pull-up resistor R26 is also connected to the bias voltage VCC, one end of a fifth voltage-dividing resistor R27 is connected with a hardware overcurrent protection port, the other end of the fifth voltage-dividing resistor R27 is connected with an output port of the comparator IC2B, one end of a sixth voltage-dividing resistor R28 is connected with the hardware overcurrent protection port, and the other end of the sixth voltage-dividing resistor R28 is grounded; the fourth filter capacitor C6 is connected in parallel with the sixth voltage-dividing resistor R28.
Further, the bias voltage divided by the first bias resistor R5 and the second bias resistor R6 is 1/2 of VCC, so that the voltage signal received by the AD sampling interface of the main control MCU is a positive voltage signal.
Specifically, the hardware overcurrent protection port is an OCP port (OCP is an IPM hardware overcurrent protection port) of an Intelligent Power Module (IPM).
Taking the sampling of the U-phase current as an example, in FIG. 3, the U-phase current is set as IUThe voltage of the AD sampling interface on the U-phase master control MCU is VUThen, there are:
wherein,
the master control MCU can be V according to the received AD sampling interface voltage through the above formulaUReversely deducing that the current of U phase is IUThat is, the main control MCU can obtain U, V, W three-phase current values, compare the current values with the overcurrent protection value set by the software, and when the sampled current value is greater than the overcurrent protection value, the software controls the motor to stop or reduce the rotation speed.
Further, as shown in FIG. 3, taking U-phase as an example, the current of U-phase is set as IUThe voltage of the AD sampling interface on the U-phase master control MCU is VUThe voltage of the voltage reduction diode D1 is reduced to VDR25 partial pressure is VR25R24 partial pressure is VR24Then, there are:
based on the above formula, under normal conditions, VR24>VR25The output of the comparator IC2B is low level, so that the IPM drive motor operates normally;
when V isR24<VR25That is, when the actual current is greater than the current protection value, the comparator IC2B outputs a high level, and the OCP port of the IPM triggers hardware overcurrent protection, so that the motor stops operating and is prevented from being damaged.
In summary, as long as the motor has an overcurrent in one phase, the hardware overcurrent protection is triggered. And realizing the function of hardware overcurrent protection.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The direct current motor sampling overcurrent protection circuit is characterized by comprising three phase current conversion parts, wherein each phase current conversion part is used for converting one phase current of corresponding U, V, W three-phase currents into phase voltage signals which can be detected by a software overcurrent protection unit and a voltage comparison unit, each phase voltage signal is connected into the corresponding software overcurrent protection unit on one hand and is connected into the voltage comparison unit on the other hand, the voltage comparison unit is used for detecting whether the sum of the input phase voltage signals exceeds a preset voltage threshold value or not, and if yes, a protection signal is sent to a hardware overcurrent protection port; and the software overcurrent protection unit detects whether the corresponding phase current is in overcurrent or not according to the received phase voltage signal.
2. The sampling overcurrent protection circuit of the direct-current motor according to claim 1, wherein the phase current conversion section comprises a single-phase current input terminal, a current-voltage conversion unit, and a voltage amplification unit, and the single-phase current input terminal, the current-voltage conversion unit, and the voltage amplification unit are connected in sequence.
3. The sampling overcurrent protection circuit of the direct-current motor according to claim 2, wherein the voltage amplification unit and the software overcurrent protection unit are further connected with a first filtering unit, and the first filtering unit is configured to filter the amplified first voltage signal to filter a harmonic wave existing in the amplified first voltage signal.
4. The sampling overcurrent protection circuit of the direct current motor according to claim 2, wherein the current-voltage conversion unit comprises a first operational amplifier (IC1A), a non-inverting input terminal of the first operational amplifier (IC1A) is connected with a bias Voltage (VCC), a first bias resistor (R5) is connected in series between the bias Voltage (VCC) and the non-inverting input terminal, one end of a second bias resistor (R6) is connected to a line between the first bias resistor (R5) and the non-inverting input terminal, and the other end is grounded; the non-inverting input end is further connected with the single-phase current input end, the inverting input end of the first operational amplifier (IC1A) is connected with the first gain resistor (R2) in series and then grounded, one end of the second gain resistor (R3) is connected with the inverting input end of the first operational amplifier (IC1A), and the other end of the second gain resistor is connected with the output end of the first operational amplifier (IC 1A).
5. The sampling overcurrent protection circuit of the DC motor according to claim 4, wherein a second voltage-dividing resistor (R4) is further connected in series between the non-inverting input terminal and the single-phase current input terminal, one end of the first voltage-dividing resistor (R1) is connected to a line between the second resistor (R4) and the non-inverting input terminal, and the other end is grounded.
6. The sampling overcurrent protection circuit of the direct current motor according to claim 4, wherein the first filter unit comprises a first filter resistor (R7) and a first filter capacitor (C1), one end of the first filter resistor (R7) is connected to the output end of the first operational amplifier (IC1A), the other end of the first filter resistor is connected to the software overcurrent protection unit, one end of the first filter capacitor (C1) is connected to a line between the first filter resistor (R7) and the software overcurrent protection unit, and the other end of the first filter capacitor is grounded.
7. The sampling overcurrent protection circuit of the direct current motor according to claim 4, wherein a lead wire is led out from an output end of the first operational amplifier (IC1A) to connect with a voltage comparison unit, the voltage comparison unit comprises a comparator (IC2B), and an output end of the first operational amplifier (IC1A) is connected with a positive input port of the comparator (IC2B) through a lead wire.
8. The sampling overcurrent protection circuit of the direct current motor according to claim 7, wherein a voltage dividing unit is further provided at the positive input port of the comparator (IC2B), the voltage dividing unit includes a fourth voltage dividing resistor (R22) and a third voltage dividing resistor (R25), the fourth voltage dividing resistor (R22) has one end connected to the positive input port of the comparator (IC2B) and the other end connected to the cathode of the buck diode (D1), the third voltage dividing resistor (R25) has one end connected to the positive input port of the comparator (IC2B) and the other end grounded; a second filter capacitor (C5) is arranged in parallel with the third voltage dividing resistor (R25).
9. The sampled overcurrent protection circuit of the direct current motor as recited in claim 8, wherein a bias Voltage (VCC) is connected to the negative input of the comparator (IC2B), and a voltage-dividing overcurrent protection circuit is further connected to a line between the bias Voltage (VCC) and the negative input of the comparator (IC 2B); the voltage-dividing overcurrent protection circuit comprises a third bias resistor (R23), a fourth bias resistor (R24) and a third filter capacitor (C4), wherein the third bias resistor (R23) is connected in series on a line between a bias Voltage (VCC) and a negative input port of a comparator (IC2B), one end of the fourth bias resistor (R24) is connected on a line between the third bias resistor (R23) and the negative input port of the comparator (IC2B), the other end of the fourth bias resistor (R24) is grounded, and the third filter capacitor (C4) and the fourth bias resistor (R24) are arranged in parallel.
10. The sampling overcurrent protection circuit of the direct current motor according to claim 9, wherein an output port of the comparator (IC2B) is connected to a bias Voltage (VCC), a pull-up resistor (R26) is further connected to the bias voltage VCC, one end of a fifth voltage-dividing resistor (R27) is connected to the hardware overcurrent protection port, the other end of the fifth voltage-dividing resistor is connected to an output port of the comparator (IC2B), one end of a sixth voltage-dividing resistor (R28) is connected to the hardware overcurrent protection port, and the other end of the sixth voltage-dividing resistor is grounded; the fourth filter capacitor (C6) is connected in parallel with the sixth voltage-dividing resistor (R28).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811427846.8A CN111224378A (en) | 2018-11-27 | 2018-11-27 | DC motor sampling overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811427846.8A CN111224378A (en) | 2018-11-27 | 2018-11-27 | DC motor sampling overcurrent protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111224378A true CN111224378A (en) | 2020-06-02 |
Family
ID=70832053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811427846.8A Pending CN111224378A (en) | 2018-11-27 | 2018-11-27 | DC motor sampling overcurrent protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111224378A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112600165A (en) * | 2020-12-21 | 2021-04-02 | 芜湖大洋电驱动有限公司 | Electric automobile motor overcurrent protection circuit and electric automobile motor |
| CN114137282A (en) * | 2021-11-26 | 2022-03-04 | 珠海格力电器股份有限公司 | Sampling circuit, sampling chip, sampling and fitting method, storage medium and equipment |
| CN116826667A (en) * | 2023-06-01 | 2023-09-29 | 广州安捷制造有限公司 | Overcurrent protection method, system, equipment and storage medium for motor |
| CN117424519A (en) * | 2023-12-06 | 2024-01-19 | 苏州炬仁半导体有限公司 | Motor control system for current detection |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2072292U (en) * | 1990-05-09 | 1991-02-27 | 济南机床电器厂 | Heat relay with phase interruption function |
| CN2749157Y (en) * | 2004-10-19 | 2005-12-28 | 吴亚芬 | Open-phase over-current protector for motor |
| CN201490697U (en) * | 2009-05-11 | 2010-05-26 | 奇瑞汽车股份有限公司 | Three-phase current detection and protection circuit |
| CN103499736A (en) * | 2013-10-22 | 2014-01-08 | 重庆长安汽车股份有限公司 | Over-current detection circuit and over-current protection circuit |
-
2018
- 2018-11-27 CN CN201811427846.8A patent/CN111224378A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2072292U (en) * | 1990-05-09 | 1991-02-27 | 济南机床电器厂 | Heat relay with phase interruption function |
| CN2749157Y (en) * | 2004-10-19 | 2005-12-28 | 吴亚芬 | Open-phase over-current protector for motor |
| CN201490697U (en) * | 2009-05-11 | 2010-05-26 | 奇瑞汽车股份有限公司 | Three-phase current detection and protection circuit |
| CN103499736A (en) * | 2013-10-22 | 2014-01-08 | 重庆长安汽车股份有限公司 | Over-current detection circuit and over-current protection circuit |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112600165A (en) * | 2020-12-21 | 2021-04-02 | 芜湖大洋电驱动有限公司 | Electric automobile motor overcurrent protection circuit and electric automobile motor |
| CN114137282A (en) * | 2021-11-26 | 2022-03-04 | 珠海格力电器股份有限公司 | Sampling circuit, sampling chip, sampling and fitting method, storage medium and equipment |
| CN114137282B (en) * | 2021-11-26 | 2022-12-16 | 珠海格力电器股份有限公司 | Sampling circuit, sampling chip, sampling and fitting method, storage medium and equipment |
| CN116826667A (en) * | 2023-06-01 | 2023-09-29 | 广州安捷制造有限公司 | Overcurrent protection method, system, equipment and storage medium for motor |
| CN116826667B (en) * | 2023-06-01 | 2024-05-07 | 广州安捷制造有限公司 | Overcurrent protection method, system, equipment and storage medium for motor |
| CN117424519A (en) * | 2023-12-06 | 2024-01-19 | 苏州炬仁半导体有限公司 | Motor control system for current detection |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111224378A (en) | DC motor sampling overcurrent protection circuit | |
| EP2309280B1 (en) | Ground fault sensing device | |
| EP2381573B1 (en) | Apparatus for protecting power supply circuit of three-phase inverter | |
| CN106911122B (en) | A kind of motor controller overcurrent protective device, electric machine controller and electric car | |
| CN1823276A (en) | Open-phase detecting method of three-phase transformer | |
| CN109981030A (en) | Bus overvoltage protection circuit, control method and magnetic suspension compressor | |
| CN111308164B (en) | Voltage detection method and system, power supply circuit, air conditioning equipment and storage medium | |
| CN111049118A (en) | Overvoltage protection device and method for power utilization circuit and circuit with overvoltage protection | |
| CN107942126B (en) | Current detection circuit, method, readable storage medium and power electronic device | |
| CN210155536U (en) | Sampling circuit and motor control system | |
| CN214335050U (en) | Current sampling circuit | |
| CN209488475U (en) | Motor control assembly and electrical equipment based on FOC | |
| CN112630504A (en) | Current sampling circuit | |
| WO2017114646A1 (en) | Driver circuit, lamp and dc grid system | |
| CN203377589U (en) | Variable-frequency air conditioner and IPM module protection circuit thereof | |
| CN210405139U (en) | Control circuit of DC vehicle-mounted compressor | |
| CN102981042A (en) | Three-phase current detection circuit for frequency converter | |
| CN110703124B (en) | Method for detecting and protecting three-phase power supply and load phase loss | |
| CN203551649U (en) | Real-time detection circuit for over-current protection of frequency converter | |
| CN115817379A (en) | Fault processing system of motor control circuit | |
| CN214255698U (en) | Bus overvoltage protection circuit, multi-level converter and frequency converter | |
| CN212135198U (en) | Drive control system and signal conditioning and protecting circuit | |
| EP2963762B1 (en) | Floating voltage suppression in a pv-inverter | |
| CN114740272A (en) | Bus capacitance online monitoring method, device, equipment and storage medium | |
| CN209896947U (en) | Motor control circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200602 |