CN215267626U - Novel DC-DC converter circuit - Google Patents
Novel DC-DC converter circuit Download PDFInfo
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- CN215267626U CN215267626U CN202120576977.3U CN202120576977U CN215267626U CN 215267626 U CN215267626 U CN 215267626U CN 202120576977 U CN202120576977 U CN 202120576977U CN 215267626 U CN215267626 U CN 215267626U
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- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 description 4
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Abstract
The utility model discloses a novel DC-DC converter circuit, which comprises a converter U1, wherein a pin 2 and a pin 3 of the converter U1 are both connected with a VIN end; a pin 8 of the converter U1 is connected with one end of a capacitor C8, a pin 9 of the converter U1 is connected with one end of a capacitor C5 and one end of a capacitor C7 respectively, the other end of the capacitor C5 is connected with one end of a resistor R5, a pin 6 of the converter U1 is connected with one end of a resistor R4, a pin 7 of the converter U1 is connected with one end of the capacitor C9, and the other end of the capacitor C8, the other end of the resistor R5, the other end of the capacitor C7, the other end of the resistor R4 and the other end of the capacitor C9 are all grounded. The utility model discloses can realize stable output under the wider condition of input range, the loss ratio of converter is lower.
Description
Technical Field
The utility model belongs to the technical field of power supply circuit, in particular to novel DC-DC converter circuit.
Background
Required controller of autopilot on the electric automobile, radar, the required mains voltage of electronics such as sensor need invariable, thereby guarantee electronics's normal work, and then guarantee the safe operation of vehicle, so with the supporting power of these electronic equipment need provide the higher voltage output of quality, and electric automobile is at the in-process of traveling, because road conditions, the throttle, the change of parameters such as heavy burden, the electric current that leads to the battery, the fluctuation appears in voltage etc. lead to the battery can't provide stable voltage output, the supply voltage that leads to electronic equipment appears unstably, influence vehicle safety.
Therefore, a new DC-DC converter circuit is needed to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
To solve the above problems, the present invention provides a novel DC-DC converter circuit to solve the problems proposed in the above background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a novel DC-DC converter circuit comprises a converter U1, wherein a pin 2 and a pin 3 of the converter U1 are both connected with a VIN terminal;
a pin 8 of the converter U1 is connected with one end of a capacitor C8, a pin 9 of the converter U1 is respectively connected with one end of a capacitor C5 and one end of a capacitor C7, the other end of the capacitor C5 is connected with one end of a resistor R5, a pin 6 of the converter U1 is connected with one end of a resistor R4, a pin 7 of the converter U1 is connected with one end of a capacitor C9, and the other end of the capacitor C8, the other end of the resistor R5, the other end of the capacitor C7, the other end of the resistor R4 and the other end of the capacitor C9 are all grounded;
a pin 16 of the converter U1 is connected with one end of a resistor R6, a pin 15 of the converter U1 is connected with the other end of a resistor R6, and the pin 15 of the converter U1 and the other end of the resistor R6 are both grounded;
the pin 23 of the converter U1 is connected with one end of a capacitor C4, and the other end of the capacitor C4 is grounded;
a pin 27 of the converter U1 is connected with a gate of a transistor Q2, a drain of the transistor Q2 is connected with a VIN end, a source of the transistor Q2 is respectively connected with one end of an inductor L1, a drain of the transistor Q4 and one end of a capacitor C1, a pin 26 of the converter U1 is respectively connected with the other end of a capacitor C1 and a cathode of a diode D1, an anode of the diode D1 is connected with a VCC end, a pin 28 of the converter U1 is connected with one end of a capacitor C1, a pin 25 of the converter U1 is connected with a gate of a transistor Q4, a source of the transistor Q4 is respectively connected with a pin 16 of the converter U1 and a source of a transistor Q3, a pin 19 of the converter U1 is connected with a gate of a transistor Q1, a source of the transistor Q1 is respectively connected with the other end of the inductor L1 and a drain of the transistor Q3, a drain of the transistor Q1 is connected with one end of a resistor R1, the other end of a drain of the resistor R1 is connected with a VOUT end, a pin 20 of the converter U1 is connected with a pin C2, the pin 20 of converter U1 still connects diode D2 negative pole, VCC end is connected to diode D2 anodal, inductance L1 other end, MOS pipe Q1 source and MOS pipe Q3 drain are still connected to converter U1's pin 18, MOS pipe Q3 grid is connected to converter U1's pin 21.
Further, a pin 13 of the converter U1 is connected to the VOUT terminal, and a pin 14 of the converter U1 is connected to one end of the resistor R1.
Further, pin 10, pin 22, and pin 29 of the converter U1 are all grounded.
Further, a resistor R2 is connected between the pin 24 and the pin 12 of the converter U1 and the pin 11 of the converter U1, one end of the resistor R2 connected to the pin 11 of the converter U1 is connected to the resistor R3, and the other end of the resistor R2 is connected to the VOUT end.
Furthermore, the converter circuit further comprises a capacitor C6 and a capacitor C3, wherein one end of the capacitor C6 is connected with the VIN end, the other end of the capacitor C6 is grounded, one end of the capacitor C3 is connected with one end of the resistor R1, and the other end of the capacitor C3 is grounded.
Further, the VOUT end is connected with an overcurrent protection circuit, the protection circuit comprises a comparator U3 and a voltage regulator tube U2, a pin 2 of the voltage regulator tube U2 is connected with a pin 5 of the comparator U3, a resistor R7 is connected between a pin 3 of the comparator U3 and the pin 1, the pin 1 of the comparator U3 is further connected with one end of a resistor R8, the other end of the resistor R8 is respectively connected with one end of a resistor R9 and a gate of a MOS tube Q5, the other end of the resistor R9 and a pin 4 of the comparator U3 are both grounded, the pin 2 of the comparator U3 and a source of the MOS tube Q5 are both connected with one end of a shunt resistor R10, the other end of the shunt resistor R10 is grounded, and a drain of the MOS tube Q5 is connected with the VOUT end.
Further, a polarity capacitor C10 is connected between a pin 2 and a pin 3 of the voltage regulator tube U2, two ends of the polarity capacitor C10 are connected in parallel with two fixed ends of an adjustable resistor RV1, the anode of the polarity capacitor C10 is connected with a pin 2 of the voltage regulator tube U2, the cathode of the polarity capacitor C10 is grounded, the free end of the adjustable resistor RV1 is connected with the pin 3 of the comparator U3, the pin 3 of the voltage regulator tube U2 is grounded, and the pin 1 of the voltage regulator tube U2 is connected with a VCC end.
The utility model discloses a technological effect and advantage:
the utility model discloses can promote fault detection speed, promote the response speed to the trouble simultaneously, and then promote the overcurrent protection speed to DCDC converting circuit, applicable in the overcurrent protection to powerful DCDC converting circuit. And, the utility model discloses can realize stable output under the wider condition of input range, the loss ratio of converter is lower.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 shows a converter circuit schematic of an embodiment of the invention;
fig. 2 shows a schematic diagram of an overcurrent protection circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model provides a novel DC-DC converter circuit, exemplarily, fig. 1 shows the converter circuit schematic diagram of the embodiment of the present invention, as shown in fig. 1, the converter circuit includes converter U1, the model of converter U1 in this embodiment is LM5175 as an example, pin 2 and pin 3 of converter U1 are both connected with VIN end;
a pin 8 of the converter U1 is connected with one end of a capacitor C8, a pin 9 of the converter U1 is respectively connected with one end of a capacitor C5 and one end of a capacitor C7, the other end of the capacitor C5 is connected with one end of a resistor R5, a pin 6 of the converter U1 is connected with one end of a resistor R4, a pin 7 of the converter U1 is connected with one end of a capacitor C9, and the other end of the capacitor C8, the other end of the resistor R5, the other end of the capacitor C7, the other end of the resistor R4 and the other end of the capacitor C9 are all grounded;
a pin 16 of the converter U1 is connected with one end of a resistor R6, a pin 15 of the converter U1 is connected with the other end of a resistor R6, and the pin 15 of the converter U1 and the other end of the resistor R6 are both grounded;
the pin 23 of the converter U1 is connected with one end of a capacitor C4, and the other end of the capacitor C4 is grounded;
a pin 27 of the converter U1 is connected with a gate of a transistor Q2, a drain of the transistor Q2 is connected with a VIN end, a source of the transistor Q2 is respectively connected with one end of an inductor L1, a drain of the transistor Q4 and one end of a capacitor C1, a pin 26 of the converter U1 is respectively connected with the other end of a capacitor C1 and a cathode of a diode D1, an anode of the diode D1 is connected with a VCC end, a pin 28 of the converter U1 is connected with one end of a capacitor C1, a pin 25 of the converter U1 is connected with a gate of a transistor Q4, a source of the transistor Q4 is respectively connected with a pin 16 of the converter U1 and a source of a transistor Q3, a pin 19 of the converter U1 is connected with a gate of a transistor Q1, a source of the transistor Q1 is respectively connected with the other end of the inductor L1 and a drain of the transistor Q3, a drain of the transistor Q1 is connected with one end of a resistor R1, the other end of a drain of the resistor R1 is connected with a VOUT end, a pin 20 of the converter U1 is connected with a pin C2, the pin 20 of converter U1 still connects diode D2 negative pole, VCC end is connected to diode D2 anodal, inductance L1 other end, MOS pipe Q1 source and MOS pipe Q3 drain are still connected to converter U1's pin 18, MOS pipe Q3 grid is connected to converter U1's pin 21.
The pin 13 of the converter U1 is connected to the VOUT terminal, and the pin 14 of the converter U1 is connected to one end of a resistor R1.
A resistor R2 is connected between the pin 24 and the pin 12 of the converter U1 and the pin 11 of the converter U1, wherein the resistor R2 selects a potentiometer, so that the output can be adjusted within a certain range, one end of the resistor R2, which is connected with the pin 11 of the converter U1, is connected with a resistor R3, and the other end of the resistor R2 is connected with a VOUT end.
The converter circuit further comprises a capacitor C6 and a capacitor C3, one end of the capacitor C6 is connected with the VIN end, the other end of the capacitor C6 is grounded, one end of the capacitor C3 is connected with one end of the resistor R1, and the other end of the capacitor C3 is grounded.
The VOUT terminal is connected to an overcurrent protection circuit, for example, fig. 2 shows a schematic diagram of the overcurrent protection circuit according to the embodiment of the present invention, as shown in fig. 2, the protection circuit includes a comparator U3 and a regulator U2, in this embodiment, the model of the comparator U3 is LM358 for example, the model of the regulator U2 is 7809 for example, pin 2 of the voltage regulator tube U2 is connected with pin 5 of a comparator U3, a resistor R7 is connected between pin 3 and pin 1 of the comparator U3, the pin 1 of the comparator U3 is also connected with one end of a resistor R8, the other end of the resistor R8 is respectively connected with one end of a resistor R9 and the grid electrode of a MOS transistor Q5, the other end of the resistor R9 and a pin 4 of the comparator U3 are both grounded, a pin 2 of the comparator U3 and a source electrode of the MOS transistor Q5 are both connected with one end of a shunt resistor R10, the other end of the shunt resistor R10 is grounded, and the drain electrode of the MOS transistor Q5 is connected with the terminal VOUT.
A polarity capacitor C10 is connected between a pin 2 and a pin 3 of the voltage regulator tube U2, two ends of the polarity capacitor C10 are connected with two fixed ends of an adjustable resistor RV1 in parallel, wherein the adjustable resistor RV1 can also be replaced by a potentiometer, the anode of the polarity capacitor C10 is connected with a pin 2 of the voltage regulator tube U2, the cathode of the polarity capacitor C10 is grounded, the free end of the adjustable resistor RV1 is connected with a pin 3 of a comparator U3, the pin 3 of the voltage regulator tube U2 is grounded, and the pin 1 of the voltage regulator tube U2 is connected with a VCC end.
The embodiment of the utility model provides a front end of converter circuit input can add a rectifier bridge, prevents that the positive negative pole of input power from connecing reverse circuit damage that leads to.
The embodiment of the utility model provides a can be with output voltage stable at input voltage, be higher than input voltage or be less than input voltage's a certain magnitude of voltage on, through the overcurrent protection circuit, MOS pipe Q5 is normal with control LOAD LOAD's under the overcurrent condition be connected and turn-off. When the MOS transistor Q5 is turned on, the load current flows from the drain to the source of the MOS transistor Q5, and finally is led to the GND terminal through the shunt resistor R10. Based on the load current, the shunt resistor R10 generates a voltage drop, and comparing the voltage with the preset voltage when the operational amplifier is used, the overcurrent can be detected and the state of the MOS transistor Q5 can be changed, so that the load can be cut off. As can be seen from fig. 2, the comparator U3 compares the voltage drop across the shunt resistor R10 with a predetermined voltage (i.e., a reference voltage) generated by the adjustable resistor RV 1. The adjustable resistor RV1 acts as a voltage divider, the voltage drop across the shunt resistor R10 is introduced to pin 2 of the comparator U3, and the reference voltage is connected to pin 3 of the comparator U3. If the induced voltage is lower than the reference voltage, the comparator U3 will generate a positive voltage (close to VCC of the comparator U3) at the output terminal, otherwise, a negative voltage (ground, here 0V) is generated at the output terminal, so the voltage is sufficient to control the switching of the MOS transistor Q5.
The embodiment of the utility model provides a can promote fault detection speed, promote the response speed to the trouble simultaneously, and then promote the overcurrent protection speed to DCDC converting circuit, applicable in the overcurrent protection to powerful DCDC converting circuit. And, the utility model discloses can realize stable output under the wider condition of input range, the loss ratio of converter is lower.
Although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (7)
1. A novel DC-DC converter circuit is characterized by comprising a converter U1, wherein a pin 2 and a pin 3 of the converter U1 are both connected with a VIN terminal;
a pin 8 of the converter U1 is connected with one end of a capacitor C8, a pin 9 of the converter U1 is respectively connected with one end of a capacitor C5 and one end of a capacitor C7, the other end of the capacitor C5 is connected with one end of a resistor R5, a pin 6 of the converter U1 is connected with one end of a resistor R4, a pin 7 of the converter U1 is connected with one end of a capacitor C9, and the other end of the capacitor C8, the other end of the resistor R5, the other end of the capacitor C7, the other end of the resistor R4 and the other end of the capacitor C9 are all grounded;
a pin 16 of the converter U1 is connected with one end of a resistor R6, a pin 15 of the converter U1 is connected with the other end of a resistor R6, and the pin 15 of the converter U1 and the other end of the resistor R6 are both grounded;
the pin 23 of the converter U1 is connected with one end of a capacitor C4, and the other end of the capacitor C4 is grounded;
a pin 27 of the converter U1 is connected to a gate of a MOS transistor Q2, a drain of the MOS transistor Q2 is connected to a VIN terminal, a source of the MOS transistor Q2 is connected to one end of an inductor L1, a drain of the MOS transistor Q4 and one end of a capacitor C1, a pin 26 of the converter U1 is connected to the other end of a capacitor C1 and a cathode of a diode D1, an anode of the diode D1 is connected to a VCC terminal, a pin 28 of the converter U1 is connected to one end of the capacitor C1, a pin 25 of the converter U1 is connected to a gate of the MOS transistor Q1, a source of the MOS transistor Q1 is connected to a pin 16 of the converter U1 and a source of the MOS transistor Q1, a pin 19 of the converter U1 is connected to the gate of the MOS transistor Q1, a source of the MOS transistor Q1 is connected to the other end of the inductor L1 and the drain of the MOS transistor Q1, a drain of the MOS transistor Q1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to a terminal VOUT, a pin 20 of the capacitor C1, and a cathode of the diode Q1 is connected to the pin 1, the VCC end is connected to diode D2 anodal, inductance L1 other end, MOS pipe Q1 source and MOS pipe Q3 drain are still connected to converter U1's pin 18, converter U1's pin 21 connects MOS pipe Q3 grid.
2. The novel DC-DC converter circuit as claimed in claim 1, wherein pin 13 of the converter U1 is connected to the terminal VOUT, and pin 14 of the converter U1 is connected to one terminal of a resistor R1.
3. The novel DC-DC converter circuit of claim 1, wherein pin 10, pin 22, and pin 29 of the converter U1 are all grounded.
4. The novel DC-DC converter circuit as claimed in claim 1, wherein resistors R2 are connected between the pin 24 and the pin 12 of the converter U1 and the pin 11 of the converter U1, one end of the resistor R2 connected with the pin 11 of the converter U1 is connected with a resistor R3, and the other end of the resistor R2 is connected with the terminal VOUT.
5. The novel DC-DC converter circuit of claim 1, further comprising a capacitor C6 and a capacitor C3, wherein one end of the capacitor C6 is connected to the VIN terminal, the other end of the capacitor C6 is grounded, one end of the capacitor C3 is connected to one end of a resistor R1, and the other end of the capacitor C3 is grounded.
6. The novel DC-DC converter circuit as claimed in any one of claims 1-5, wherein the VOUT terminal is connected with an overcurrent protection circuit, the protection circuit comprises a comparator U3 and a voltage regulator U2, the pin 2 of the voltage regulator U2 is connected with the pin 5 of the comparator U3, a resistor R7 is connected between the pin 3 and the pin 1 of the comparator U3, the pin 1 of the comparator U3 is also connected with one end of a resistor R8, the other end of the resistor R8 is respectively connected with one end of a resistor R9 and the grid of a MOS transistor Q5, the other end of the resistor R9 and the pin 4 of the comparator U3 are both grounded, the pin 2 of the comparator U3 and the source of the MOS transistor Q5 are both connected with one end of a shunt resistor R10, the other end of the shunt resistor R10 is grounded, and the drain of the MOS transistor Q5 is connected with the VOUT terminal.
7. The novel DC-DC converter circuit as claimed in claim 6, wherein a polarity capacitor C10 is connected between pin 2 and pin 3 of the voltage regulator tube U2, two ends of the polarity capacitor C10 are connected in parallel with two fixed ends of an adjustable resistor RV1, the positive electrode of the polarity capacitor C10 is connected with pin 2 of the voltage regulator tube U2, the negative electrode of the polarity capacitor C10 is grounded, the free end of the adjustable resistor RV1 is connected with pin 3 of the comparator U3, pin 3 of the voltage regulator tube U2 is grounded, and pin 1 of the voltage regulator tube U2 is connected with a VCC end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120576977.3U CN215267626U (en) | 2021-03-22 | 2021-03-22 | Novel DC-DC converter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120576977.3U CN215267626U (en) | 2021-03-22 | 2021-03-22 | Novel DC-DC converter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215267626U true CN215267626U (en) | 2021-12-21 |
Family
ID=79504234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120576977.3U Expired - Fee Related CN215267626U (en) | 2021-03-22 | 2021-03-22 | Novel DC-DC converter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215267626U (en) |
-
2021
- 2021-03-22 CN CN202120576977.3U patent/CN215267626U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211221 |