CN210405255U - Voltage stable transmission protection circuit - Google Patents
Voltage stable transmission protection circuit Download PDFInfo
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- CN210405255U CN210405255U CN201921622765.3U CN201921622765U CN210405255U CN 210405255 U CN210405255 U CN 210405255U CN 201921622765 U CN201921622765 U CN 201921622765U CN 210405255 U CN210405255 U CN 210405255U
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Abstract
The utility model discloses a voltage smooth transportation protection circuit, which comprises a comparator, wherein the reverse input end of the comparator is respectively connected with a first resistor and a second resistor, the forward input end of the comparator is respectively connected with a third resistor, a fourth resistor and a fifth resistor, and the output end of the comparator is connected with a sixth resistor and a fifth resistor; the sixth resistor is connected to the second capacitor and the base electrode of the triode, and the second capacitor and the emitting electrode of the triode are grounded; the collector of the triode is connected with a seventh resistor, the seventh resistor is respectively connected with an eighth resistor, a ninth resistor and the G pole of the NMOS tube, and the ninth resistor and the S pole of the NMOS tube are grounded; and the D pole of the NMOS tube is connected with a tenth resistor, and the tenth resistor and the eighth resistor are connected into 24V output voltage. The utility model discloses mainly appear: the circuit can absorb the regenerative electromotive force of the motor, avoid the situation that the motor generates recoil voltage in the braking process to cause overvoltage alarm and damage other electronic parts, and improve the stability and the safety of the whole vehicle.
Description
Technical Field
The utility model relates to an electronic circuit particularly, especially, relate to a voltage steadily carries protection circuit.
Background
Under the background of rapid global economy growth, continuous energy consumption increase and increasingly aggravated environmental problems, China starts to vigorously popularize and develop electric automobiles, wherein a motor and a control technology thereof are one of key components of the electric automobiles. Because the motor of the electric automobile has the back electromotive force in the working process, the back electromotive force can be directly superposed on a power bus, when the peak voltage of the back electromotive force is too high, electronic components in the automobile are easily damaged due to overvoltage, and the safety, stability and reliability of the electronic components play a critical role in the driving safety of the electric automobile. The motor controller is particularly important as one of the key safety parts of the electric automobile, and the safety reliability of the motor controller is decisive for the safe running of the automobile, so that the overvoltage protection control of the motor controller is particularly important.
And the produced protection signal of overvoltage crowbar of machine controller among the prior art is direct output, directly cuts off the bus voltage, does not carry out timely release to the overvoltage voltage that stores on the bus electric capacity, if the condition of excessive pressure appears repeatedly under the interference condition, arouses always that excessive pressure reports to the police, and probably causes the damage to other electronic parts to influence the stability of whole car, the potential safety hazard appears when leading to the vehicle to travel.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough of prior art existence, provide a voltage steadily carries protection circuit.
The purpose of the utility model is realized through the following technical scheme:
a voltage stable transmission protection circuit comprises a comparator, wherein the reverse input end of the comparator is respectively connected with one end of a first resistor, a second resistor and a first capacitor, the other end of the first resistor is connected with 24V input voltage, and the other end of the second resistor is grounded; the positive input end of the comparator is respectively connected to one end of a third resistor, a fourth resistor and a fifth resistor and the other end of the first capacitor, the other end of the third resistor is connected with a 3.3V input voltage, and the other end of the fourth resistor is grounded; the output end of the comparator is respectively connected with one end of a sixth resistor and the other end of the fifth resistor;
the other end of the sixth resistor is respectively connected to the second capacitor and the base electrode of the triode, and the other end of the second capacitor and the emitting electrode of the triode are grounded; the collector of the triode is connected with a seventh resistor, the other end of the seventh resistor is respectively connected with an eighth resistor, a ninth resistor and the G pole of the NMOS tube, and the other end of the ninth resistor and the S pole of the NMOS tube are grounded; and the D pole of the NMOS tube is connected to a tenth resistor, and the other end of the tenth resistor and the other end of the eighth resistor are connected in parallel to 24V output voltage.
Preferably, the device further comprises a reverse diode ZD1 integrated with the NMOS transistor Q2, and the reverse diode ZD1 is connected between the S pole and the G pole of the NMOS transistor Q2.
The beneficial effects of the utility model are mainly embodied in that:
1. the circuit can absorb the regenerative electromotive force of the motor, and avoid the situation that the motor generates recoil voltage in the braking process to cause overvoltage alarm and damage other electronic components, thereby improving the stability and safety of the whole vehicle;
2. the first capacitor can filter the interference of input voltage, so that the voltage is smoother, and the stability of the system is guaranteed;
3. the triode is used for amplifying the driving capability of the control signal so as to control the conduction and the cut-off of the NMOS tube to realize the rapid relief of overvoltage voltage, thereby ensuring that the output voltage is within the threshold range;
4. the tenth resistor is configured to dissipate energy in the overvoltage voltage to ensure that the output voltage is within a threshold value, thereby avoiding an overvoltage alarm and damage to other electronic components.
Drawings
The technical scheme of the utility model is further explained by combining the attached drawings as follows:
FIG. 1: the circuit diagram of the utility model.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. However, these embodiments are not limited to the present invention, and structural, method, or functional changes made by those skilled in the art according to these embodiments are all included in the scope of the present invention.
The present invention is not limited to the above embodiments, and structural, methodological, or functional changes made by those skilled in the art according to the embodiments are all included in the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1, the present invention discloses a voltage smooth-feeding protection circuit, which includes a comparator U1, wherein the reverse input terminal of the comparator U1 is connected to one end of a first resistor R1, a second resistor R2 and a first capacitor C1, the other end of the first resistor R1 is connected to a 24V input voltage, and the other end of the second resistor R2 is grounded; the positive input end of the comparator U1 is respectively connected to one end of a third resistor R3, a fourth resistor R4 and a fifth resistor R5 and the other end of the first capacitor C1, the other end of the third resistor R3 is connected to 3.3V input voltage, and the other end of the fourth resistor R4 is grounded; the output end of the comparator U1 is respectively connected to one end of a sixth resistor R6 and the other end of the fifth resistor R5. The first capacitor can filter interference of input voltage, so that the voltage is smoother, and the stability of the system is guaranteed.
The other end of the sixth resistor R6 is respectively connected to a second capacitor C2 and the base electrode of the triode Q1, and the other end of the second capacitor C2 and the emitter electrode of the triode Q1 are grounded; a collector of the triode Q1 is connected to a seventh resistor R7, the other end of the seventh resistor R7 is connected to the eighth resistor R8, the ninth resistor R9 and the G electrode of the NMOS transistor Q2, respectively, and the other end of the ninth resistor R9 and the S electrode of the NMOS transistor Q2 are grounded; the D pole of the NMOS transistor Q2 is connected to a tenth resistor R10, and the other end of the tenth resistor R10 and the other end of the eighth resistor R8 are connected in parallel to a 24V output voltage. Further, the diode device also comprises a reverse diode ZD1 which is integrated with the NMOS transistor Q2, and the reverse diode ZD1 is connected between the S pole and the G pole of the NMOS transistor Q2.
In the implementation, after the path is opened, the first capacitor filters out the voltage supply ripple interference, so that the supply voltage is smoother. When the overvoltage protection signal is low level when the voltage is detected to be lower than the alarm value through the comparator U1, the rear-stage triode and the NMOS tube cannot be driven to be opened, when the bus voltage is detected to be higher than the alarm value, the high-level overvoltage protection signal can be immediately output, at the moment, the triode can generate an overvoltage dangerous condition to request to open the NMOS tube, and the overvoltage voltage is rapidly consumed through the tenth resistor, so that the safety of the electronic components of the whole vehicle and the stability of the driving performance of the whole vehicle are protected.
The beneficial effects of the utility model are mainly embodied in that:
1. the circuit is exquisite in design, can absorb the regenerative electromotive force of the motor, and avoids the situation that the motor generates recoil voltage in the braking process to cause overvoltage alarm and damage other electronic parts, so that the stability and the safety of the whole vehicle are improved;
2. the first capacitor can filter the interference of input voltage, so that the voltage is smoother, and the stability of the system is guaranteed;
3. the triode is used for amplifying the driving capability of the control signal so as to control the conduction and the cut-off of the NMOS tube to realize the rapid relief of overvoltage voltage, thereby ensuring that the output voltage is within the threshold range;
4. the tenth resistor is configured to dissipate energy in the overvoltage voltage to ensure that the output voltage is within a threshold value, thereby avoiding an overvoltage alarm and damage to other electronic components.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (2)
1. Voltage smooth-feeding protection circuit, including comparator (U1), its characterized in that: the inverting input end of the comparator (U1) is respectively connected to one end of a first resistor (R1), a second resistor (R2) and a first capacitor (C1), the other end of the first resistor (R1) is connected with a 24V input voltage, and the other end of the second resistor (R2) is grounded; the positive input end of the comparator (U1) is respectively connected to one end of a third resistor (R3), one end of a fourth resistor (R4) and one end of a fifth resistor (R5) and the other end of the first capacitor (C1), the other end of the third resistor (R3) is connected to 3.3V input voltage, and the other end of the fourth resistor (R4) is grounded; the output end of the comparator (U1) is respectively connected with one end of a sixth resistor (R6) and the other end of the fifth resistor (R5);
the other end of the sixth resistor (R6) is respectively connected to a second capacitor (C2) and the base electrode of the triode (Q1), and the other end of the second capacitor (C2) and the emitter electrode of the triode (Q1) are grounded; the collector of the triode (Q1) is connected with a seventh resistor (R7), the other end of the seventh resistor (R7) is respectively connected with an eighth resistor (R8), a ninth resistor (R9) and the G pole of an NMOS (Q2), and the other end of the ninth resistor (R9) and the S pole of the NMOS (Q2) are grounded; the D pole of the NMOS transistor (Q2) is connected to a tenth resistor (R10), and the other end of the tenth resistor (R10) and the other end of the eighth resistor (R8) are connected in parallel to 24V output voltage.
2. The voltage soft-handoff protection circuit of claim 1, wherein: the NMOS transistor (Q2) is integrated with a reverse diode (ZD 1), and the reverse diode (ZD 1) is connected between the S pole and the G pole of the NMOS transistor (Q2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921622765.3U CN210405255U (en) | 2019-09-27 | 2019-09-27 | Voltage stable transmission protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921622765.3U CN210405255U (en) | 2019-09-27 | 2019-09-27 | Voltage stable transmission protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210405255U true CN210405255U (en) | 2020-04-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921622765.3U Active CN210405255U (en) | 2019-09-27 | 2019-09-27 | Voltage stable transmission protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210405255U (en) |
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2019
- 2019-09-27 CN CN201921622765.3U patent/CN210405255U/en active Active
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