CN208539786U - Low-cost DC-DC voltage reduction circuit - Google Patents
Low-cost DC-DC voltage reduction circuit Download PDFInfo
- Publication number
- CN208539786U CN208539786U CN201820815112.6U CN201820815112U CN208539786U CN 208539786 U CN208539786 U CN 208539786U CN 201820815112 U CN201820815112 U CN 201820815112U CN 208539786 U CN208539786 U CN 208539786U
- Authority
- CN
- China
- Prior art keywords
- diode
- capacitor
- connect
- output
- voltage
- 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
- 239000003990 capacitor Substances 0.000 claims description 36
- 230000006837 decompression Effects 0.000 claims description 16
- 230000005611 electricity Effects 0.000 claims description 6
- 230000001052 transient effect Effects 0.000 claims description 5
- 238000012905 input function Methods 0.000 abstract description 2
- 230000000087 stabilizing effect Effects 0.000 abstract description 2
- 230000001629 suppression Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model relates to a low-cost DC-DC step-down circuit, including voltage protection unit, input filter unit, step-down unit and output filter unit, the output of voltage protection unit is connected with the input of step-down unit through input filter unit, and the output of step-down unit is connected with the input of output filter unit. Low-cost DC-DC step-down circuit, output voltage is stable, the ripple is little, the circuit is with low costs and have higher work efficiency. The DC-DC voltage reduction chip adopts a voltage reduction switch type integrated voltage stabilizing circuit, the rated switching frequency of the voltage reduction chip is up to 370KHZ, the output ripple is small, the voltage reduction chip has cycle-by-cycle current limitation, over-temperature turn-off and under-voltage locking input functions, the current consumption is less than 2 muA in a shutdown state, and the voltage reduction chip is suitable for the application of a power supply system of an automobile-level battery management system.
Description
Technical field
The utility model relates to power technique fields, and in particular to a kind of low cost DC-DC reduction voltage circuit.
Background technique
DC-DC (Direct Current-Direct Current, DC-DC) reduction voltage circuit is the Gao Zhi that will be inputted
Galvanic electricity pressure (such as 4.75V-45V) is converted to stable low dc voltage (such as 5V) output, the decompression control in DC-DC reduction voltage circuit
Coremaking piece usually utilizes the LDO (Low Dropout Regulator, low pressure difference linear voltage regulator) of its inside by the Gao Zhi of input
Galvanic electricity pressure be converted to decompression control chip operation needed for operating voltage, so decompression control chip internal loss power compared with
Greatly, cause the voltage converting accuracy of DC-DC reduction voltage circuit not high, circuit cost is high.
Utility model content
The purpose of this utility model is to provide a kind of low cost DC-DC reduction voltage circuits, and the circuit conversion precision is high, circuit
At low cost, output is stablized, and work efficiency is high.
To achieve the above object, the utility model uses following technical scheme:
A kind of low cost DC-DC reduction voltage circuit, including voltage protection unit, input filter unit, pressure unit and output
The output end of filter unit, the voltage protection unit is connected by the input terminal of input filter unit and pressure unit, decompression
The output end of unit is connect with the input terminal of output filter unit.
As a further improvement of the above technical scheme:
The voltage protection unit includes diode D1, D2, D3, resistance R1, R2, capacitor C1, the sun of the diode D1
Pole is connect by resistance R1 with voltage source, and the cathode of diode D1 is connect with the cathode of diode D3, and the anode of diode D3 connects
The one end on ground, the diode D2 is connect with the cathode of diode D1, the other end ground connection of diode D2, and the one of the resistance R1
End is connect with the anode of diode D1, and the other end of resistance R1 is connect by capacitor C1 with the cathode of diode D1, diode D1,
The cathode of D3 and the input terminal of input filter circuit connect.
The input filter circuit by common mode inductance L1 and be connected in parallel on capacitor C2, C3 of two output end of common mode inductance L1, C4,
C5, C6, C7, C8, C9, C10, C11 are constituted.
The pressure unit includes decompression chip, diode D4, inductance L2, resistance R6 and capacitor C12, C13, two pole
The anode of pipe D4 passes sequentially through capacitor C13, R6 and connect with the end COMP for being depressured chip, and one end of capacitor C12 is with diode D4's
Cathode and the end the BDS connection for being depressured chip, the other end of capacitor C12 are connect by inductance L2 with output filter circuit, the drop
The end EN and VS of pressure chip is connect with input filter circuit.
The output filter circuit includes C14, C15, C16, C17 and resistance R9, described capacitor C14, C15 and resistance R9
One end is connect with pressure unit, the other end ground connection of capacitor C14, C15, the other end and capacitor C16, C17 of the resistance R9
One end connection, the other end ground connection of capacitor C16, C17.
The diode D2 uses Transient Suppression Diode.
The model TLE8366EV50 of the decompression chip.
As shown from the above technical solution, low cost DC-DC reduction voltage circuit described in the utility model, output voltage stabilization,
Ripple is small, circuit cost is low and working efficiency with higher.DC-DC is depressured chip using step-down switching type integrated voltage-stabilized electricity
Road, it is small that decompression chip nominal switching frequency is up to 370KHZ, output ripple, and has Cycle by Cycle current limit, excess temperature shutdown
With under-voltage locking input function, in the power-offstate, confession of the current drain less than 2 μ A, suitable for automotive grade battery management system
Electric system application.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model.
Specific embodiment
The utility model is described further with reference to the accompanying drawing:
As shown in Figure 1, the inexpensive DC-DC reduction voltage circuit of the present embodiment, including voltage protection unit, input filter list
Member, pressure unit and output filter unit, the output end of voltage protection unit are defeated by input filter unit and pressure unit
Enter end connection, the output end of pressure unit is connect with the input terminal of output filter unit.
The voltage protection unit includes diode D1, D3, Transient Suppression Diode D2, resistance R1, R2, capacitor C1, two poles
The anode of pipe D1 is connect by resistance R1 with voltage source, and the cathode of diode D1 is connect with the cathode of diode D3, diode D3
Plus earth, one end of diode D2 connect with the cathode of diode D1, the other end ground connection of diode D2, the one of resistance R1
End is connect with the anode of diode D1, and the other end of resistance R1 is connect by capacitor C1 with the cathode of diode D1, diode D1,
The cathode of D3 and the input terminal of input filter circuit connect.Resistance R1, R2, capacitor C1, diode D1, D2 and transient state inhibit two
Pole pipe D3 constitutes voltage protection unit.Diode D1 is that voltage reversal, Transient Suppression Diode D3 play voltage in order to prevent
The effect of protection.
The present embodiment, input filter circuit is by common mode inductance L1 and is connected in parallel on the capacitor of two output end of common mode inductance L1
C2, C3, C4, C5, C6, C7, C8, C9, C10, C11 are constituted.The input filter circuit can be to the DC4.75-45V voltage of input
Electromagnetic interference is filtered out very well.
The pressure unit includes decompression chip, diode D4, inductance L2, resistance R6 and the electricity of model TLE8366EV50
Holding C12, C13, the anode of diode D4 passes sequentially through capacitor C13, R6 and connect with the end COMP for being depressured chip, and the one of capacitor C12
It holds and is connect with the end BDS of the cathode of diode D4 and decompression chip, the other end of capacitor C12 passes through inductance L2 and output filtered electrical
Road connection, the end EN and VS for being depressured chip is connect with input filter circuit.Inductance L2 is to reduce direct voltage output resistance
Anti-, it is depressured chip UA1 and its peripheral circuit constitutes buck, capacitor C12 plays height as boost capacitor, capacitor C13
Frequency filter action, decompression chip UA1 is switching mode voltage stabilizing chip, its low in energy consumption, precision height has extremely low cut-off current damage
Consumption, which includes safety locking, such as Cycle by Cycle current limit, excess temperature shutdown and under-voltage locking input.Diode D4 rises
Afterflow effect, inductance L2 play energy storage.
Output filter circuit includes C14, C15, C16, C17 and resistance R9, one end and drop of capacitor C14, C15 and resistance R9
Unit connection, the other end ground connection of capacitor C14, C15 are pressed, the other end of resistance R9 is connect with one end of capacitor C16, C17, capacitor
The other end of C16, C17 are grounded.
Working principle: input voltage is through voltage protection unit, input filter unit, and it is smaller to obtain ripple, metastable
After input voltage, 5V voltage is being obtained through DC-DC pressure unit, 5V voltage obtains exporting stable line by output filter unit
The small 5V output voltage of wave.
Embodiment described above is only that preferred embodiments of the present invention are described, not practical to this
Novel range is defined, and under the premise of not departing from the spirit of the design of the utility model, those of ordinary skill in the art are to this
The various changes and improvements that the technical solution of utility model is made should all fall into the protection that the utility model claims book determines
In range.
Claims (7)
1. a kind of low cost DC-DC reduction voltage circuit, it is characterised in that: single including voltage protection unit, input filter unit, decompression
The output end of member and output filter unit, the voltage protection unit is connected by the input terminal of input filter unit and pressure unit
It connects, the output end of pressure unit is connect with the input terminal of output filter unit.
2. low cost DC-DC reduction voltage circuit according to claim 1, it is characterised in that: the voltage protection unit includes
The anode of diode D1, D2, D3, resistance R1, R2, capacitor C1, the diode D1 are connect by resistance R1 with voltage source, two poles
The cathode of pipe D1 is connect with the cathode of diode D3, the plus earth of diode D3, one end of the diode D2 and diode
The cathode of D1 connects, and the other end ground connection of diode D2, one end of the resistance R1 is connect with the anode of diode D1, resistance R1
The other end connect with the cathode of diode D1 by capacitor C1, the input of the cathode and input filter circuit of diode D1, D3
End connection.
3. low cost DC-DC reduction voltage circuit according to claim 1, it is characterised in that: the input filter unit is by altogether
Mould inductance L1 and capacitor C2, C3, C4, C5, C6, C7, C8, C9, C10, the C11 for being connected in parallel on two output end of common mode inductance L1 are constituted.
4. low cost DC-DC reduction voltage circuit according to claim 1, it is characterised in that: the pressure unit includes decompression
Chip, diode D4, inductance L2, resistance R6 and capacitor C12, C13, the anode of the diode D4 pass sequentially through capacitor C13, R6
It is connect with the end COMP of decompression chip, one end of capacitor C12 is connect with the end BDS of the cathode of diode D4 and decompression chip, electricity
The other end for holding C12 is connect by inductance L2 with output filter circuit, the end EN and VS of the decompression chip and input filter electricity
Road connection.
5. low cost DC-DC reduction voltage circuit according to claim 1, it is characterised in that: the output filter unit includes
One end of capacitor C14, C15, C16, C17 and resistance R9, described capacitor C14, C15 and resistance R9 are connect with pressure unit, capacitor
The other end of C14, C15 are grounded, and the other end of the resistance R9 is connect with one end of capacitor C16, C17, and capacitor C16, C17's is another
One end ground connection.
6. low cost DC-DC reduction voltage circuit according to claim 2, it is characterised in that: the diode D2 uses transient state
Inhibit diode.
7. low cost DC-DC reduction voltage circuit according to claim 4, it is characterised in that: the model of the decompression chip
TLE8366EV50。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820815112.6U CN208539786U (en) | 2018-05-29 | 2018-05-29 | Low-cost DC-DC voltage reduction circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820815112.6U CN208539786U (en) | 2018-05-29 | 2018-05-29 | Low-cost DC-DC voltage reduction circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208539786U true CN208539786U (en) | 2019-02-22 |
Family
ID=65380947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820815112.6U Active CN208539786U (en) | 2018-05-29 | 2018-05-29 | Low-cost DC-DC voltage reduction circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208539786U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022027744A1 (en) * | 2020-08-07 | 2022-02-10 | 厦门能瑞康电子有限公司 | Separately-excited micro-power module |
-
2018
- 2018-05-29 CN CN201820815112.6U patent/CN208539786U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022027744A1 (en) * | 2020-08-07 | 2022-02-10 | 厦门能瑞康电子有限公司 | Separately-excited micro-power module |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203261235U (en) | High-gain SEPIC converter | |
| CN103633842A (en) | Single-switch inverted output quadratic wide gain converter | |
| CN101562403B (en) | Single-phase electronic type electric energy meter electric source | |
| CN208539786U (en) | Low-cost DC-DC voltage reduction circuit | |
| CN102223093B (en) | Power circuit with start-stop control, low power supply and small power and negative high voltage | |
| CN203445602U (en) | Flyback overvoltage protection circuit | |
| CN205847086U (en) | A kind of switching capacity type high-gain quasi-Z source DC DC changer | |
| CN105846674B (en) | Non-isolated high no-load voltage ratio two-way DC converter | |
| CN110086340B (en) | Coupling inductance bidirectional large-transformation-ratio DC-DC converter | |
| CN103490635A (en) | Improved H bridge buck-boost DC converter and control method thereof | |
| CN203423622U (en) | Vehicle-mounted mobile phone wireless charger voltage-stabilized power supply | |
| CN203590037U (en) | Single switch inverted output secondary wide gain converter | |
| CN203590025U (en) | Single-switch high-gain boost converter | |
| CN203457048U (en) | Low-ripple four-switch buck-boost DC converter | |
| CN105978322A (en) | Switch capacitor type high-gain quasi Z source DC-DC converter | |
| CN203608084U (en) | Four-switch boost-buck converter with low ripple | |
| CN204538965U (en) | A kind of DC-DC change-over circuit | |
| CN211183803U (en) | Isolated form push-pull type DC-DC booster unit | |
| CN201422074Y (en) | Switch power supply | |
| CN204633604U (en) | A kind of switching power source control circuit | |
| CN204408192U (en) | A kind of switch power voltage-stabilizing circuit | |
| CN103944386B (en) | DC-DC boost converting device and boost conversion method of work thereof | |
| CN203457054U (en) | Wide input voltage flyback switching power supply suitable for DC motor driving | |
| CN209516941U (en) | A kind of boat-carrying power supply change-over device | |
| CN202975087U (en) | Power supply circuit module for intelligent electric meter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |