CN212435582U - 12V300W electric vehicle direct current converter with TVS protection - Google Patents
12V300W electric vehicle direct current converter with TVS protection Download PDFInfo
- Publication number
- CN212435582U CN212435582U CN202021440718.XU CN202021440718U CN212435582U CN 212435582 U CN212435582 U CN 212435582U CN 202021440718 U CN202021440718 U CN 202021440718U CN 212435582 U CN212435582 U CN 212435582U
- Authority
- CN
- China
- Prior art keywords
- tvs
- voltage
- diode
- resistor
- fuse
- 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.)
- Active
Links
Images
Abstract
The utility model discloses a 12V300W electric motor car direct current converter with TVS protection, including N channel MOS pipe M1, the source connects fuse F1, the grid connects the one end of resistance R1, the drain electrode connects the one end of current detection resistance R2; a freewheeling diode D1, the cathode of which is connected with the other end of the current detection resistor R2 and one end of the energy storage inductor L1; the output filter capacitor C3, the TVS diode D7 and the voltage stabilizing circuit are connected between the other end of the energy storage inductor L1 and the anode of the fly-wheel diode D1 in parallel; a control electrode G of the bidirectional thyristor U1 is connected with the voltage-stabilizing control circuit, a main electrode T2 is connected with a source electrode of an N-channel MOS tube M1 and a fuse F1, and a main electrode T1 is connected with an anode of a freewheeling diode D1. The utility model can protect the load and avoid the loss of unrecoverable load; the fuse can be directly blown before the TVS diode is burnt out, so that the processing time is shortened, and the service life of the TVS is prolonged.
Description
Technical Field
The utility model relates to a 12V300W electric motor car direct current converter with TVS protection belongs to and fills electric pile technical field.
Background
The 12V300W electric vehicle DC converter directly converts the battery voltage of the electric vehicle from 48V DC to 60V DC to 12V DC to supply power for the relevant electronic accessories of the electric vehicle, so that the relevant loads on the electric vehicle can work normally.
The existing power converter adopts a Pulse Width Modulation (PWM) technology, and is controlled by a current mode chip UC3845, a main structure circuit of the existing power converter is shown in fig. 1, and a PWM signal output from a pin 6 of the current mode chip UC3845 (i.e., a chip U2) controls switching of a MOS transistor M1 through a driving resistor R1. When the MOS transistor M1 is switched on, power supply voltage supplies power to a load through the current detection resistor R2 and the energy storage inductor L1; when the MOS transistor M1 is turned off, the energy storage inductor L1 continues to supply power to the load, and meanwhile, the loop is formed by conducting through the freewheeling diode D1, and stable output is formed in a circulating mode. Wherein C1 is the input filter capacitor and C3 is the output filter capacitor. However, in practical use, if the converter MOS transistor M1 is damaged, the output voltage will rise instantaneously to the input voltage of the converter, which in turn will damage the load of the vehicle and cause unrecoverable loss.
Disclosure of Invention
To the problem that above-mentioned prior art exists, the utility model provides a 12V300W electric motor car direct current converter with TVS protection, when MOS pipe M1 takes place to damage, the TVS diode can protect the load of vehicle, avoids causing unrecoverable loss. Meanwhile, the arrangement of the bidirectional thyristor U1 and the voltage stabilization control circuit can realize one channel, so that the fuse can be directly blown before the TVS diode is burnt out, the processing time is shortened, and the service life of the TVS is prolonged.
In order to achieve the above purpose, the utility model adopts the following technical scheme: A12V 300W electric vehicle direct current converter with TVS protection comprises an N-channel MOS tube M1, a source electrode connected with a fuse F1, a grid electrode connected with one end of a resistor R1, and a drain electrode connected with one end of a current detection resistor R2; a freewheeling diode D1, the cathode of which is connected with the other end of the current detection resistor R2 and one end of the energy storage inductor L1; a cathode of the first TVS diode D7 is connected to the other end of the energy storage inductor L1 and one end of the output filter capacitor C3; the voltage stabilizing control circuit is connected in parallel at two ends of the output filter capacitor C3; and a control electrode G of the bidirectional thyristor U1 is connected with the voltage stabilizing control circuit, a main electrode T2 is connected with a source electrode of an N-channel MOS transistor M1 and a fuse F1, and a main electrode T1 is connected with an anode of a TVS diode D7, an anode of a freewheeling diode D1 and the other end of an output filter capacitor C3.
Preferably, the voltage-stabilizing control circuit comprises a voltage-stabilizing tube D8 and a resistor R8, wherein the cathode of the voltage-stabilizing tube D8 is connected with one end of an output filter capacitor C3, the anode of the voltage-stabilizing tube is connected with one end of the resistor R8, the other end of the resistor R8 is connected with the other end of the output filter capacitor C3, and the control electrode G of the bidirectional controllable silicon U1 is connected with the connection point of the anode of the voltage-stabilizing tube and one end of the resistor R8.
Compared with the prior art, the utility model discloses an add the TVS diode, when MOS pipe M1 takes place to damage, the TVS diode can protect the load of vehicle, avoids causing unrecoverable loss. Meanwhile, the arrangement of the bidirectional thyristor U1 and the voltage stabilization control circuit can realize one channel, so that the fuse can be directly blown before the TVS diode is burnt out, the processing time is shortened, and the service life of the TVS is prolonged.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a circuit diagram of a switching power supply;
FIG. 2 is a circuit diagram of the present invention;
fig. 3 is a test waveform diagram of the present invention.
Detailed Description
The technical solutions in the implementation of the present invention will be clear from the following description and accompanying drawings, and the described embodiments are only some embodiments, not all embodiments, of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 2, an embodiment of the present invention provides a 12V300W electric vehicle dc converter with TVS protection, which includes an N-channel MOS transistor M1, a source connected to a fuse F1, a gate connected to one end of a resistor R1, and a drain connected to one end of a current detection resistor R2; a freewheeling diode D1, the cathode of which is connected with the other end of the current detection resistor R2 and one end of the energy storage inductor L1; a cathode of the first TVS diode D7 is connected to the other end of the energy storage inductor L1 and one end of the output filter capacitor C3; the voltage stabilizing control circuit is connected in parallel at two ends of the output filter capacitor C3; and a control electrode G of the bidirectional thyristor U1 is connected with the voltage stabilizing control circuit, a main electrode T2 is connected with a source electrode of an N-channel MOS transistor M1 and a fuse F1, and a main electrode T1 is connected with an anode of a TVS diode D7, an anode of a freewheeling diode D1 and the other end of an output filter capacitor C3. The TVS diode D7 is a transient voltage suppression diode, and when the N-channel MOS transistor M1 is damaged, it is subjected to a high-energy transient overvoltage pulse, and the working impedance of the N-channel MOS transistor M1 can be immediately lowered to a very low conduction value, allowing the pulse peak current to pass through, and clamping the voltage to a predetermined level, thereby protecting the load.
Preferably, the voltage-stabilizing control circuit comprises a voltage-stabilizing tube D8 and a resistor R8, wherein the cathode of the voltage-stabilizing tube D8 is connected with one end of an output filter capacitor C3, the anode of the voltage-stabilizing tube is connected with one end of the resistor R8, the other end of the resistor R8 is connected with the other end of the output filter capacitor C3, and the control electrode G of the bidirectional controllable silicon U1 is connected with the connection point of the anode of the voltage-stabilizing tube and one end of the resistor R8.
The working process is as follows:
when the MOS transistor M1 is damaged, the voltage applied to the first TVS diode D7 exceeds the breakdown voltage value thereof, and the first TVS diode D7 clamps the voltage within a certain range to ensure that the subsequent load (resistor R9) can work normally; meanwhile, the voltage regulator tube D8 works immediately, the working voltage of the voltage regulator tube D8 controls the bidirectional thyristor U1 to be conducted to form a passage, at the moment, the fuse F1 is blown immediately by large current, and then the input is cut off. Since the high voltage output to the first TVS diode D7 exists for a short time, the first TVS diode D7 is not damaged, and thus the disadvantage that the fuse is blown by the large current under the condition that the high voltage burns through the first TVS diode D7 for a long time is overcome. After the fuse is replaced, the system is powered on, and the bidirectional controllable silicon U1 enters the state of the work to be controlled again.
As shown in fig. 3, will the utility model discloses the test has been carried out, the first TVS diode D7 of unidirectional conduction: 1.5K20A, the minimum breakdown voltage is 19V and the maximum clamping voltage is 27.7V, allowing a pulsed peak current 54A. When the MOS transistor M1 is turned on, the voltage across the MOS transistor M1 will exceed the breakdown voltage thereof, and the first TVS diode D7 clamps the voltage at 27.7V, so that the output voltage of the MOS transistor M1 after being turned on will not rise to the level of the voltage at the power input terminal, and the load will not be damaged. At the moment, a voltage regulator tube D8 works, the stabilized voltage controls the conduction of a bidirectional thyristor U1, the front-stage fuse F1 of the circuit is blown, and the input is cut off, so that the purpose of protecting the rear-stage circuit is achieved. Meanwhile, the first TVS diode D7 is guaranteed not to work under the high-voltage condition all the time and burn through occurs, and the service life of the first TVS diode D7 is prolonged.
To sum up, the utility model discloses an add the TVS diode, when MOS pipe M1 takes place to damage, the TVS diode can protect the load of vehicle, avoids causing unrecoverable loss. Meanwhile, the arrangement of the bidirectional thyristor U1 and the voltage stabilization control circuit can realize one channel, so that the fuse can be directly blown before the TVS diode is burnt out, the processing time is shortened, and the service life of the TVS is prolonged.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the embodiments may be appropriately combined to form other embodiments understood by those skilled in the art.
Claims (2)
1. A12V 300W electric vehicle DC converter with TVS protection, comprising:
the source of the N-channel MOS tube M1 is connected with a fuse F1, the grid of the N-channel MOS tube M1 is connected with one end of a resistor R1, and the drain of the N-channel MOS tube M3578 is connected with one end of a current detection resistor R2;
a freewheeling diode D1, the cathode of which is connected with the other end of the current detection resistor R2 and one end of the energy storage inductor L1;
a cathode of the first TVS diode D7 is connected to the other end of the energy storage inductor L1 and one end of the output filter capacitor C3;
the voltage stabilizing control circuit is connected in parallel at two ends of the output filter capacitor C3;
and a control electrode G of the bidirectional thyristor U1 is connected with the voltage stabilizing control circuit, a main electrode T2 is connected with a source electrode of an N-channel MOS transistor M1 and a fuse F1, and a main electrode T1 is connected with an anode of a TVS diode D7, an anode of a freewheeling diode D1 and the other end of an output filter capacitor C3.
2. The direct current converter of an electric vehicle with the TVS-protected 12V300W function as claimed in claim 1, wherein the voltage regulation control circuit comprises a voltage regulator tube D8 and a resistor R8, the cathode of the voltage regulator tube D8 is connected with one end of an output filter capacitor C3, the anode of the voltage regulator tube is connected with one end of a resistor R8, the other end of the resistor R8 is connected with the other end of the output filter capacitor C3, and the control electrode G of the bidirectional thyristor U1 is connected with the connection point of the anode of the voltage regulator tube and one end of the resistor R8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021440718.XU CN212435582U (en) | 2020-07-20 | 2020-07-20 | 12V300W electric vehicle direct current converter with TVS protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021440718.XU CN212435582U (en) | 2020-07-20 | 2020-07-20 | 12V300W electric vehicle direct current converter with TVS protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212435582U true CN212435582U (en) | 2021-01-29 |
Family
ID=74279202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021440718.XU Active CN212435582U (en) | 2020-07-20 | 2020-07-20 | 12V300W electric vehicle direct current converter with TVS protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212435582U (en) |
-
2020
- 2020-07-20 CN CN202021440718.XU patent/CN212435582U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101459331A (en) | Over voltage protection device, DC to DC voltage convertor and over voltage protection method | |
| CN114157131A (en) | Surge suppression circuit for switching power supply | |
| CN217215967U (en) | Surge protection circuit, power supply system and unmanned vehicle | |
| CN105337263A (en) | Output overvoltage protection circuit and method for DC/DC converter | |
| CN212413046U (en) | Soft-off active clamping protection circuit and power supply system | |
| CN212435582U (en) | 12V300W electric vehicle direct current converter with TVS protection | |
| CN109462219B (en) | Electrical system surge voltage suppression circuit and surge voltage suppression method thereof | |
| CN2728096Y (en) | FET automotive alternator voltage regulator with multiple protective functions | |
| CN217427985U (en) | Slow starting circuit and switching power supply | |
| CN115037140A (en) | Voltage surge suppression circuit | |
| CN212726852U (en) | DC-DC chip circuit and chip | |
| US20040150375A1 (en) | Load dump transient voltage controller | |
| CN113676029B (en) | Active clamp circuit based on IGBT | |
| CN216531081U (en) | Voltage reduction circuit | |
| CN218771293U (en) | Input protection circuit, control device and car | |
| CN218733242U (en) | Overvoltage and undervoltage surge voltage suppression circuit | |
| CN219204347U (en) | Discharging circuit and power supply with built-in discharging circuit | |
| CN215956261U (en) | IGBT drive circuit | |
| CN214429320U (en) | Battery control circuit and electronic equipment | |
| CN220421661U (en) | Military vehicle-mounted power supply protection circuit | |
| CN212674898U (en) | Power failure early warning circuit for water quality monitoring | |
| CN207896866U (en) | Linear start-up circuit and its DCDC power supplys for DCDC power supplys | |
| CN214314622U (en) | Vehicle-mounted driving reverse connection prevention device and equipment | |
| CN217522573U (en) | Overvoltage protection circuit structure and electrical equipment | |
| CN211744043U (en) | Voltage stabilizing circuit of charger reverse connection protection MOS tube |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |