CN202444247U - Electric steering engine output current transient state protecting circuit - Google Patents
Electric steering engine output current transient state protecting circuit Download PDFInfo
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- CN202444247U CN202444247U CN2012200510903U CN201220051090U CN202444247U CN 202444247 U CN202444247 U CN 202444247U CN 2012200510903 U CN2012200510903 U CN 2012200510903U CN 201220051090 U CN201220051090 U CN 201220051090U CN 202444247 U CN202444247 U CN 202444247U
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Abstract
The utility model relates to an electric steering engine output current transient state protecting circuit and belongs to the technical field of power electronics. Electric steering engine output current sampling value monitored by a current sensor is compared with reference value, the protecting circuit does not work when the sampling value is lower than the reference value, and the protecting circuit disconnects all the power switch devices to fulfill the aim of limiting current once the sampling value is more than the reference value, so that the power devices and motor parts of a driving module are protected. The electric steering engine output current transient state protecting circuit is simple and feasible, requires a few parts can limit transient high current generated under the conditions of quick start, frequent reversing, external interference and the like of an electric steering engine and can limit the current at the safe current value or below, so that the functional reliability of an electric steering engine product is greatly improved.
Description
Technical field
The utility model relates to a kind of electric steering engine output current transient protection circuit, belongs to electric and electronic technical field.
Background technology
Use the electric steering engine requirement according to the airborne weapon that dispenses of K/YBS500A type; Single channel steering wheel output current is no more than the safety value of 20A; And steering wheel is starting fast, frequently can produce transient high-current under the situation such as switching-over and external disturbance, when this electric current exceeds safety value, might cause damage to driver module internal power device and motor component.
In order to address the above problem, need a kind of driver module electric current instantaneous protection circuit of design.
The utility model content
The purpose of the utility model is that the power electric current for fear of electric steering engine output causes damage to driver module internal power device and motor component when exceeding safety value; A kind of electric steering engine output current transient protection circuit is proposed; Steering wheel output current sampled value and the reference value of utilizing current sensor to monitor compare, and when sampled value was lower than reference value, protective circuit was not worked; In case sampled value exceeds reference value; Protective circuit will make all device for power switching be in cut-off state, reaches the current limliting purpose, thereby plays the effect of protection driver module power device and motor component.
The purpose of the utility model realizes through following technical scheme.
A kind of electric steering engine output current transient protection circuit of the utility model; Its peripheral circuit is for being used for motor-driven H bridge circuit and PWM drive circuit; Link position in the middle of armature is positioned in this H bridge circuit, transient protection circuit is made up of current sensor, voltage comparator circuit and power device protective circuit three parts;
Current sensor and armature are installed in series and are being used for the middle link position of motor-driven H bridge circuit; Current sensor will be sampled to the armature electric current, and convert sampled result into input that the voltage signal that characterizes current sampling data is sent to voltage comparator circuit;
Voltage comparator circuit comprises voltage-limiting protection and filter circuit, generating circuit from reference voltage and comparison circuit; Wherein the voltage signal of current sensor output is sent into the first comparison input of comparison circuit through voltage-limiting protection and filter circuit; The reference voltage that generating circuit from reference voltage produces is sent to second of comparison circuit and compares input; The output of comparison circuit is a logic level signal, and this signal is sent to the power device protective circuit, when the voltage signal that characterizes current sampling data is lower than reference voltage signal; Comparator output high level, otherwise comparator output low level;
The power device protective circuit is 4 road logicals; The first input end of every road logical is the logic level signal of comparison circuit output in the voltage comparator circuit; 4 tunnel drive signals that the PWM drive circuit that second input is respectively corresponding is exported, output is respectively applied for the drive end of 4 brachium pontis of H bridge circuit; When the logic level signal of comparison circuit output in the voltage comparator circuit is low level; The output of 4 road logicals is low level; The power switch pipe of all 4 brachium pontis will be in cut-off state immediately; Otherwise the logic level signal of comparison circuit output is a high level in the voltage comparator circuit, and then all 4 tunnel drive signals with the output of PWM drive circuit are identical in the output of 4 road logicals;
In order to prevent the protective circuit vibration, voltage comparator circuit is designed to hysteresis mode relatively.
A kind of electric steering engine output current transient protection circuit of the utility model; Its course of work is: the armature current sampling data that current sensor obtains also converts voltage signal into; When this voltage signal is lower than the reference voltage signal of setting; Voltage comparator circuit output high level, this moment, the power device protective circuit was inoperative, and the control of 4 brachium pontis is still accomplished by the PWM drive circuit; When the voltage signal that characterizes the armature current sampling data is higher than the reference voltage signal of setting; The voltage comparator circuit output low level; 4 road logicals all are output as low level in the power device protective circuit; The power switch pipe of all 4 brachium pontis will be in cut-off state immediately, play the protective effect to power switch pipe.
Beneficial effect
The electric steering engine output current transient protection circuit of the utility model; Simple possible; Used device is few; Can electric current be limited in below the safe current value to electric steering engine starting fast, frequently can producing transient high-current under the situation such as switching-over and external disturbance and carry out current limliting, improve the functional reliability of electric steering engine product greatly.
Description of drawings
Fig. 1 is the scheme of installation of current sensor among the utility model embodiment;
Fig. 2 is a voltage comparator circuit schematic diagram among the utility model embodiment;
Fig. 3 is power device protection philosophy figure among the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further specified.
A kind of electric steering engine output current transient protection circuit; Its peripheral circuit is for being used for motor-driven H bridge circuit and PWM drive circuit; Link position in the middle of armature is positioned in this H bridge circuit, transient protection circuit is made up of current sensor, voltage comparator circuit and power device protective circuit three parts;
Current sensor and armature are installed in series and are being used for the middle link position of motor-driven H bridge circuit; Current sensor will be sampled to the armature electric current, and convert sampled result into input that the voltage signal that characterizes current sampling data is sent to voltage comparator circuit;
Voltage comparator circuit comprises voltage-limiting protection and filter circuit, generating circuit from reference voltage and comparison circuit; Wherein the voltage signal of current sensor output is sent into the first comparison input of comparison circuit through voltage-limiting protection and filter circuit; The reference voltage that generating circuit from reference voltage produces is sent to second of comparison circuit and compares input; The output of comparison circuit is a logic level signal, and this signal is sent to the power device protective circuit, when the voltage signal that characterizes current sampling data is lower than reference voltage signal; Comparator output high level, otherwise comparator output low level;
The power device protective circuit is 4 road logicals; The first input end of every road logical is the logic level signal of comparison circuit output in the voltage comparator circuit; 4 tunnel drive signals that the PWM drive circuit that second input is respectively corresponding is exported, output is respectively applied for the drive end of 4 brachium pontis of H bridge circuit; When the logic level signal of comparison circuit output in the voltage comparator circuit is low level; The output of 4 road logicals is low level; The power switch pipe of all 4 brachium pontis will be in cut-off state immediately; Otherwise the logic level signal of comparison circuit output is a high level in the voltage comparator circuit, and then all 4 tunnel drive signals with the output of PWM drive circuit are identical in the output of 4 road logicals;
In order to prevent the protective circuit vibration, voltage comparator circuit is designed to hysteresis mode relatively.
Embodiment
As shown in Figure 1; Resistance R 1, R2, R3, R4, diode D1, D2, D3, D4, switching tube Q1, Q2, Q3, Q4 are configured for motor-driven H bridge circuit; Armature Motor is installed in the centre position that four brachium pontis connect; Current sensor F1 and armature Motor are connected in series, and its F1 of current sense detects the armature electric current and converts the voltage signal Current that characterizes current value into, and Current is sent in the voltage comparator circuit;
As shown in Figure 2; R7, D1 and C1 form voltage-limiting protection and filter circuit, prevent that too high voltage from causing damage to the voltage comparator of back level, and C1 plays filtering, jamproof effect; Obtain reference voltage by R5, R6 dividing potential drop in the generating circuit from reference voltage; Characterize the voltage signal of current sampling data and negative pole and the positive pole that reference voltage level is received comparison circuit respectively, comparison circuit comprises R8, R9 and voltage comparator U1A, and voltage ratio rises and adopted chip LM139; By the hysteresis comparison circuit that is connected into shown in Figure 2; Sampled value and reference value are compared the logic level signal Logic that the back comparator will be exported two states, and when sampled value was lower than reference value, Logic was a high level; In case sampled value exceeds reference value, Logic is a low level;
As shown in Figure 3; The power device protective circuit is 4 road logicals; The first input end of every road logical is the logic level signal Logic of comparison circuit output in the voltage comparator circuit; 4 tunnel drive signals that the PWM drive circuit that second input is respectively corresponding is exported, output P1, P2, P3, P4 are respectively applied for the drive end of switching tube Q1, Q2, Q3, Q4 in 4 brachium pontis of H bridge circuit; When the logic level signal of comparison circuit output in the voltage comparator circuit is low level; The output of 4 road logicals is low level; The power switch pipe Q1 of all 4 brachium pontis, Q2, Q3, Q4 will be in cut-off state immediately; Otherwise the logic level signal of comparison circuit output is a high level in the voltage comparator circuit, and then all 4 tunnel drive signals with the output of PWM drive circuit are identical in the output of 4 road logicals;
Above-mentioned electric steering engine output current transient protection circuit; Its course of work is: the armature current sampling data that current sensor obtains also converts voltage signal into; When this voltage signal is lower than the reference voltage signal of setting; Voltage comparator circuit output high level, this moment, the power device protective circuit was inoperative, and the control of 4 brachium pontis is still accomplished by the PWM drive circuit; When the voltage signal that characterizes the armature current sampling data is higher than the reference voltage signal of setting; The voltage comparator circuit output low level; 4 road logicals all are output as low level in the power device protective circuit; The power switch pipe of all 4 brachium pontis will be in cut-off state immediately, play the protective effect to power switch pipe.
The above; Be merely the preferable embodiment of the utility model; But the protection range of the utility model is not limited thereto; Any technical staff who is familiar with the present technique field is in the technical scope that the utility model discloses, and the variation that can expect easily or replacement all should be encompassed within the protection range of the utility model.
Claims (1)
1. electric steering engine output current transient protection circuit; Its peripheral circuit is for being used for motor-driven H bridge circuit and PWM drive circuit; Link position in the middle of armature is positioned in this H bridge circuit; It is characterized in that transient protection circuit is made up of current sensor, voltage comparator circuit and power device protective circuit three parts;
Current sensor and armature are installed in series and are being used for the middle link position of motor-driven H bridge circuit; Current sensor will be sampled to the armature electric current, and convert sampled result into input that the voltage signal that characterizes current sampling data is sent to voltage comparator circuit;
Voltage comparator circuit comprises voltage-limiting protection and filter circuit, generating circuit from reference voltage and comparison circuit; Wherein the voltage signal of current sensor output is sent into the first comparison input of comparison circuit through voltage-limiting protection and filter circuit; The reference voltage that generating circuit from reference voltage produces is sent to second of comparison circuit and compares input; The output of comparison circuit is a logic level signal, and this signal is sent to the power device protective circuit, when the voltage signal that characterizes current sampling data is lower than reference voltage signal; Comparator output high level, otherwise comparator output low level;
The power device protective circuit is 4 road logicals; The first input end of every road logical is the logic level signal of comparison circuit output in the voltage comparator circuit; 4 tunnel drive signals that the PWM drive circuit that second input is respectively corresponding is exported, output is respectively applied for the drive end of 4 brachium pontis of H bridge circuit; When the logic level signal of comparison circuit output in the voltage comparator circuit is low level; The output of 4 road logicals is low level; The power switch pipe of all 4 brachium pontis will be in cut-off state immediately; Otherwise the logic level signal of comparison circuit output is a high level in the voltage comparator circuit, and then all 4 tunnel drive signals with the output of PWM drive circuit are identical in the output of 4 road logicals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200510903U CN202444247U (en) | 2012-02-17 | 2012-02-17 | Electric steering engine output current transient state protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200510903U CN202444247U (en) | 2012-02-17 | 2012-02-17 | Electric steering engine output current transient state protecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202444247U true CN202444247U (en) | 2012-09-19 |
Family
ID=46825677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200510903U Withdrawn - After Issue CN202444247U (en) | 2012-02-17 | 2012-02-17 | Electric steering engine output current transient state protecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202444247U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102593794A (en) * | 2012-02-17 | 2012-07-18 | 哈尔滨建成集团有限公司 | Output current transient protection circuit for electric steering engine |
| CN107703979A (en) * | 2017-09-21 | 2018-02-16 | 中国科学院长春光学精密机械与物理研究所 | The peak current suppressing method and device of Rudder Servo System |
| WO2019034132A1 (en) * | 2017-08-17 | 2019-02-21 | 比亚迪股份有限公司 | Protection apparatus for electric motor controller, electric motor controller and electric automobile |
-
2012
- 2012-02-17 CN CN2012200510903U patent/CN202444247U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102593794A (en) * | 2012-02-17 | 2012-07-18 | 哈尔滨建成集团有限公司 | Output current transient protection circuit for electric steering engine |
| CN102593794B (en) * | 2012-02-17 | 2014-08-13 | 哈尔滨建成集团有限公司 | Output current transient protection circuit for electric steering engine |
| WO2019034132A1 (en) * | 2017-08-17 | 2019-02-21 | 比亚迪股份有限公司 | Protection apparatus for electric motor controller, electric motor controller and electric automobile |
| CN107703979A (en) * | 2017-09-21 | 2018-02-16 | 中国科学院长春光学精密机械与物理研究所 | The peak current suppressing method and device of Rudder Servo System |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120919 Effective date of abandoning: 20140813 |
|
| RGAV | Abandon patent right to avoid regrant |