CN208353219U - Vehicle-mounted DC/DC converter - Google Patents
Vehicle-mounted DC/DC converter Download PDFInfo
- Publication number
- CN208353219U CN208353219U CN201820272664.7U CN201820272664U CN208353219U CN 208353219 U CN208353219 U CN 208353219U CN 201820272664 U CN201820272664 U CN 201820272664U CN 208353219 U CN208353219 U CN 208353219U
- Authority
- CN
- China
- Prior art keywords
- voltage
- transformer
- input
- current
- converter
- 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
Abstract
The utility model discloses a kind of vehicle-mounted DC/DC converters, including circulation control circuit: when the input dc voltage of transformer and output dc voltage mismatch and then the current stress of switch element significantly increases, transformer voltage ratio n is selected to guarantee voltage matches, come reduce switch element electric current stress, and the Dynamic Matching of power supply is realized by the control logic of change duty ratio D, phase shifting angle φ and duty ratio D are controlled simultaneously, the circulation value and current spike of inside transformer are reduced, transfer efficiency is improved.The utility model has the following beneficial effects: it is when the input dc voltage and output dc voltage of transformer mismatch, converter can be carried out effective work, and then improve converter reliability.
Description
Technical field
The utility model relates to automobile technical fields, and in particular to a kind of vehicle-mounted DC/DC converter.
Background technique
Electric car is increasingly becoming the vehicles of effective and safe due to the advantages that its environmental protection, energy conservation, low noise, in country
Support under can also Continued, this means that inside automobile industry market prospects of DC/DC converter or very good
's.
DC/DC converter is the circuit by a kind of DC voltage conversion of level for the DC voltage of another level.DC-
The main component of DC converter is transformer.When changing voltage using transformer, transformer need to pass through alternating voltage.Rechargeable battery
DC voltage, thus DC-DC converter by using power semiconductor ON/OFF come the DC voltage of self-charging battery, by it
It is converted into alternating voltage.Then, alternating voltage is converted using transformer, power semiconductor is recycled to be converted into alternating voltage
The DC voltage of 12V.When converting AC and DC using power semiconductor, for the noise (smoothing) for inhibiting voltage waveform, go back
Capacitor is used.
For popular, the input of converter is the DC voltage having already passed through after filtering, but it can be admittedly
It is fixed constant；The output of converter is variable DC voltage, is designed to voltage in several modes also for many applications.At present
The efficiency of DC/DC converter can be very high, reaches 90% or more.
From the point of view of classification, according to whether DC/DC converter can be divided into isolated DC/DC converter using isolating transformer
With non-isolated DC/DC converter.Non-isolated DC/DC converter generally has a switch and a diode, and what is had can
The energy-storage travelling wave tubes such as an inductance and a capacitor can also be had.The also non-isolated DC/DC converter of some other types,
There are two switch, two diodes and some energy-storage travelling wave tubes in circuit topology.In many applications, be included in electric car and
Need to realize the electrical isolation that outputs and inputs in hybrid vehicle, isolated DC/DC converter is exactly such a to have height
The Basic Topological of frequency isolating transformer.
In actual application, critically important to the selection of DC-DC converter, reasonable employment DC-DC can be controlled effectively
The stabilization of high-voltage value processed is conducive to the promotion of electric car driveability.At present from domestic electric car R & D design thinking
From the point of view of, it is big multi-vendor using Uniderectional DC-DC converter.Uniderectional DC-DC converter can achieve optimization motor control, improve it is electronic
The effect of automobile whole efficiency performance, while plugging can also be avoided the occurrence of and be unable to control and surge voltage occur with converter
Rough sledding.Before 2015 from the point of view of the electric car of exploitation design, Uniderectional DC-DC converter is mainstream, domestic foreign enterprise
The enterprise that industry is related to the field is also more, and market product is relatively sufficient.
Over the past two years, bi-directional DC-DC converter also started to be acceptable to the market.Bi-directional DC-DC converter can be more easily
The transmitted in both directions for realizing energy, reduces the use of other electronic devices, has saved cost to a certain extent, at the same its there are also bodies
Accumulate the advantages such as small, high-efficient.From the point of view of trend, bi-directional DC-DC converter application will be more and more common.
When the normal start and stop of automobile, battery voltage will appear temporary decline, make the power device of some pairs of voltage-sensitives (such as
ECU, radio) it is adversely affected, when especially starting vehicle in the case where discharged or defective battery, some electricity consumptions not powered off
Device may can not work normally, and seriously affected and multiplying for automobile driven comfort and travel safety.
Currently, there are mainly two types of solutions to the problems described above, a kind of method is to be cut in automobile start and stop using relay
The power supply for certain vehicle-mounted electrical equipments of breaking, this method using the partial function for sacrificing automobile as cost, be generally only applicable to at
The stringenter low-grade automobile of this control；Second method is to increase vehicle-mounted DC/DC converter, is utilized in vehicle shutdown process
DC/DC converter is the power device power supply of some pairs of voltage-sensitives.Although this method solves sag issue, but existing
The vehicle-mounted DC/DC converter having there is the following problem: when the input dc voltage of transformer and output dc voltage mismatch, turn
Parallel operation not can be carried out effective work.
Utility model content
The purpose of this utility model is to provide a kind of vehicle-mounted DC/DC converter, transformer input dc voltage and
When exporting dc voltage mismatch, converter can be carried out effective work, and then improve converter reliability.
To achieve the above object, the utility model provides the following technical solutions:
A kind of vehicle-mounted DC/DC converter, including
Converter circuit, the converter circuit include transformer and the switch element for being coupled to the transformer, described
Converter circuit changes the transformer current for flowing through the transformer according to the conduction and cut-off of the switch element, thus will
Input dc voltage is converted to magnitude corresponding with each of the turn-on time of the switch element and deadline
Dc voltage is exported, and the output dc voltage of conversion is supplied to load；
Transformer current detection unit, the transformer current detection unit is when the switch element is in the conductive state
Detect the transformer current；
Input electric cur- rent measure unit, the input electric cur- rent measure unit detection flow through the converter electricity from external connector
The input current on road；
Load current detection unit, the load current detection unit detection flow through the load from the converter circuit
Load current；
And control circuit, the control circuit determine the transformation based on the load current and the input dc voltage
The upper limit value of device electric current, and change the switch element in a manner of the transformer current to detect is no more than the upper limit value
Turn-on time and at least one of deadline,
Wherein, the switch element includes the control terminal that input has control signal, and according to the logic of the control signal
Level is switched on state or off state,
Wherein, the control circuit includes:
Reversal connection input/output terminal control circuit is prevented, monitoring input electric cur- rent measure unit and load current detection unit are passed through
Input/output state, when input/output reverse connection, turn off input and output major loop, protect main circuit electrical safety；
Circulation control circuit: when the input dc voltage and output dc voltage of transformer mismatch the electric current of switch element in turn
When stress significantly increases, transformer voltage ratio n is selected to guarantee voltage matches, come reduce switch element electric current stress, and
The Dynamic Matching of power supply is realized by changing the control logic of duty ratio D, while controlling phase shifting angle φ and duty ratio D, is reduced
The circulation value and current spike of inside transformer improve transfer efficiency.
Preferably, the control circuit further includes Sofe Switch start-up circuit, passes through primary side peak absorbing circuit, limitation starting
The dash current of Shi Liujing converter circuit, dash current is limited within safe range.
Preferably, wherein control circuit based on the load current and it is described input dc voltage between ratio to determine
State the upper limit value of transformer current.
The working principle of the utility model are as follows:
When the current stress that the input dc voltage and output dc voltage of transformer mismatch switch element in turn significantly increases
When, select transformer voltage ratio n to guarantee voltage matches, come reduce switch element electric current stress, and by changing duty
Control logic than D realizes the Dynamic Matching of power supply, while controlling phase shifting angle φ and duty ratio D, reduces inside transformer
Circulation value and current spike improve transfer efficiency.
Voltage-drop loading process of the DC/DC converter when opening is controlled by the method gradually loaded, while DC/DC is turned
The output electric current of parallel operation is monitored that avoiding it is more than current limit value, and limits electric current by limitation voltage.This method is not
It only ensure that the stabilization rapid increase of DC/DC converter output voltage when opening, while passing through the control to each step voltage
Electric current is limited, protects DC/DC converter and low tension battery from impact.
The utility model has the following beneficial effects: it turns when the input dc voltage and output dc voltage of transformer mismatch
Parallel operation can be carried out effective work, and then improve converter reliability.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiment of the present utility model is further described.Implement below
Example is only used for clearly illustrating the technical solution of the utility model, and cannot be used as a limitation the protection model of limitation the utility model
It encloses.
The technical solution of the utility model specific implementation is:
A kind of vehicle-mounted DC/DC converter, including
Converter circuit, the converter circuit include transformer and the switch element for being coupled to the transformer, described
Converter circuit changes the transformer current for flowing through the transformer according to the conduction and cut-off of the switch element, thus will
Input dc voltage is converted to magnitude corresponding with each of the turn-on time of the switch element and deadline
Dc voltage is exported, and the output dc voltage of conversion is supplied to load；
Transformer current detection unit, the transformer current detection unit is when the switch element is in the conductive state
Detect the transformer current；
Input electric cur- rent measure unit, the input electric cur- rent measure unit detection flow through the converter electricity from external connector
The input current on road；
Load current detection unit, the load current detection unit detection flow through the load from the converter circuit
Load current；
And control circuit, the control circuit determine the transformation based on the load current and the input dc voltage
The upper limit value of device electric current, and change the switch element in a manner of the transformer current to detect is no more than the upper limit value
Turn-on time and at least one of deadline,
Wherein, the switch element includes the control terminal that input has control signal, and according to the logic of the control signal
Level is switched on state or off state,
Wherein, the control circuit includes:
Reversal connection input/output terminal control circuit is prevented, monitoring input electric cur- rent measure unit and load current detection unit are passed through
Input/output state, when input/output reverse connection, turn off input and output major loop, protect main circuit electrical safety；
Circulation control circuit: when the input dc voltage and output dc voltage of transformer mismatch the electric current of switch element in turn
When stress significantly increases, transformer voltage ratio n is selected to guarantee voltage matches, come reduce switch element electric current stress, and
The Dynamic Matching of power supply is realized by changing the control logic of duty ratio D, while controlling phase shifting angle φ and duty ratio D, is reduced
The circulation value and current spike of inside transformer improve transfer efficiency.
The control circuit further includes Sofe Switch start-up circuit, and by primary side peak absorbing circuit, limitation flows through when starting
The dash current of converter circuit, dash current is limited within safe range.
Wherein control circuit determines the transformation based on the ratio between the load current and the input dc voltage
The upper limit value of device electric current.
The working principle of the utility model are as follows:
When the current stress that the input dc voltage and output dc voltage of transformer mismatch switch element in turn significantly increases
When, select transformer voltage ratio n to guarantee voltage matches, come reduce switch element electric current stress, and by changing duty
Control logic than D realizes the Dynamic Matching of power supply, while controlling phase shifting angle φ and duty ratio D, reduces inside transformer
Circulation value and current spike improve transfer efficiency.
Voltage-drop loading process of the DC/DC converter when opening is controlled by the method gradually loaded, while DC/DC is turned
The output electric current of parallel operation is monitored that avoiding it is more than current limit value, and limits electric current by limitation voltage.This method is not
It only ensure that the stabilization rapid increase of DC/DC converter output voltage when opening, while passing through the control to each step voltage
Electric current is limited, protects DC/DC converter and low tension battery from impact.
The utility model has the following beneficial effects: it turns when the input dc voltage and output dc voltage of transformer mismatch
Parallel operation can be carried out effective work, and then improve converter reliability.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without deviating from the technical principle of the utility model, several improvements and modifications can also be made, these change
It also should be regarded as the protection scope of the utility model into retouching.
Claims (3)
1. a kind of vehicle-mounted DC/DC converter, including
Converter circuit, the converter circuit include transformer and the switch element for being coupled to the transformer, the conversion
Device circuit changes the transformer current for flowing through the transformer according to the conduction and cut-off of the switch element, thus will input
Dc voltage is converted to the output with magnitude corresponding with each of the turn-on time of the switch element and deadline
Dc voltage, and the output dc voltage of conversion is supplied to load；
Transformer current detection unit, the transformer current detection unit are detected when the switch element is in the conductive state
The transformer current；
Input electric cur- rent measure unit, the input electric cur- rent measure unit detection flow through the converter circuit from external connector
Input current；
Load current detection unit, the load current detection unit detection flow through the negative of the load from the converter circuit
Carry electric current；
And control circuit, the control circuit determine the transformer electricity based on the load current and the input dc voltage
The upper limit value of stream, and change leading for the switch element in a manner of the transformer current to detect is no more than the upper limit value
Logical at least one of time and deadline,
Wherein, the switch element includes the control terminal that input has control signal, and according to the logic level of the control signal
On state or off state is switched to,
It is characterized in that,
Wherein, the control circuit includes:
Prevent reversal connection input/output terminal control circuit, by monitoring input electric cur- rent measure unit and load current detection unit it is defeated
Enter output state, when input/output reverse connection, turns off input and output major loop, protect main circuit electrical safety；
Circulation control circuit: when the input dc voltage and output dc voltage of transformer mismatch the current stress of switch element in turn
When significantly increasing, transformer voltage ratio n is selected to guarantee voltage matches, come reduce switch element electric current stress, and pass through
Change the control logic of duty ratio D to realize the Dynamic Matching of power supply, while controlling phase shifting angle φ and duty ratio D, reduces transformation
Circulation value and current spike inside device improve transfer efficiency.
2. vehicle-mounted DC/DC converter according to claim 1, which is characterized in that the control circuit further includes Sofe Switch
Start-up circuit, by primary side peak absorbing circuit, limitation flows through the dash current of converter circuit, dash current is limited when starting
System is within safe range.
3. vehicle-mounted DC/DC converter according to claim 2, which is characterized in that wherein control circuit is based on the load
Ratio between electric current and the input dc voltage determines the upper limit value of the transformer current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820272664.7U CN208353219U (en) | 2018-02-27 | 2018-02-27 | Vehicle-mounted DC/DC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820272664.7U CN208353219U (en) | 2018-02-27 | 2018-02-27 | Vehicle-mounted DC/DC converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208353219U true CN208353219U (en) | 2019-01-08 |
Family
ID=64874918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820272664.7U Active CN208353219U (en) | 2018-02-27 | 2018-02-27 | Vehicle-mounted DC/DC converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208353219U (en) |
-
2018
- 2018-02-27 CN CN201820272664.7U patent/CN208353219U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11088538B2 (en) | Module of suppressing inrush current, method of controlling the same and on-board bidirectional charger using the same | |
| CN107947538B (en) | Gate driver with short-circuit protection | |
| CN102364859B (en) | Switching power supply control device and flyback switching power supply with same | |
| CN102403891B (en) | Dc-dc converter | |
| KR20170138050A (en) | System and method for a dc/dc converter | |
| CN102377358B (en) | System and method for reducing standby power consumption of power converter with switching mode | |
| CN106026702A (en) | High-power direct current plasma power supply | |
| US20160303984A1 (en) | Charging device for vehicle | |
| CN105811766A (en) | Boost-buck DC-DC converter for fuel cell vehicle | |
| CN208353219U (en) | Vehicle-mounted DC/DC converter | |
| KR101508180B1 (en) | Charging system for Mild hybrid vehicle | |
| CN203301376U (en) | Vehicle direct current transition assembly | |
| CN1042182C (en) | Active absorption circuit for soft switch | |
| CN201830511U (en) | High-frequency electronic transformer for low-voltage high-power light emitting diode (LED) spot lamp | |
| CN107064699B (en) | Aging test device of vehicle-mounted DC/DC converter | |
| CN108282095A (en) | Vehicle-mounted DC/DC converters | |
| Sayed et al. | A new circuit topology for battery charger from 200V DC source to 12V for hybrid automotive applications | |
| CN103812352A (en) | Bridge type alternating current chopper power converter | |
| CN101860220B (en) | Single-chip Cuk switching power supply circuit | |
| WO2023100721A1 (en) | Control device | |
| CN101694967B (en) | Alternating-current brushless voltage regulating and stabilizing digital power-supply unit | |
| CN201898454U (en) | Vehicle-mounted power supply inverter | |
| CN105553279A (en) | Power supply circuit, vehicle-mounted air conditioner, and power supply circuit control method | |
| CN112491155A (en) | Multi-module SIPO circuit topology and control method for receiving end of magnetic parallel type electric automobile high-power dynamic wireless power supply system | |
| CN103795245B (en) | A kind of Vehicular DC-DC converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |