CN206117480U - High -low pressure switching circuit of LLC transform output - Google Patents
High -low pressure switching circuit of LLC transform output Download PDFInfo
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- CN206117480U CN206117480U CN201621099695.4U CN201621099695U CN206117480U CN 206117480 U CN206117480 U CN 206117480U CN 201621099695 U CN201621099695 U CN 201621099695U CN 206117480 U CN206117480 U CN 206117480U
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Abstract
The utility model relates to a high -low pressure switching circuit of LLC transform output, including output, the vice limit of a n transformer and a n rectifier, wherein n is greater than 1, the interchange side of n rectifier is connected at the both ends on the vice limit of a n transformer, the high -pressure side of a low voltage terminal connecting m+1 rectifier direct current side of a m rectifier direct current side, wherein 0< M< N, be equipped with select switch between vice limit of transformer and output for through the size of selecting to insert the output voltage of the quantity regulation output of output rectifier. The utility model provides a technical scheme, the quantity of rectifier that can be through the select switch controlled access output is adjusted output output voltage size to the nonadjustable problem of LLC converter output voltage has been solved.
Description
Technical field
This utility model is related to the output control technical field of LLC changers, and in particular to a kind of height of LLC conversion output
Low pressure switching circuit.
Background technology
At present, for the new-energy automobile of supporting " zero-emission, no pollution ", State Grid Corporation of China promotes energetically electric automobile
The development of charging station, high-power charger proposes high requirement to reliability, power density etc..DC/DC conversion using compared with
It is many that phase-shifting full-bridge ZVS will add resonant inductance due to former limit for LLC resonant transformation topological sum phase-shifting full-bridge transformation topologies, so as to
Effective dutycycle is lost, the diode of its secondary has very big reverse recovery loss, and power density and efficiency are difficult greatly
The raising of amplitude.LLC converter topologies can realize ZVS due to its original, and secondary commutation diode can realize ZCS, so LLC
The features such as changer is with its high frequency, high efficiency, high power density is widely used.
But LLC changers, as shown in figure 1, when input voltage vin is definite value, its output voltage V0 is fixed value, when
Need that during larger voltage demand just can not be met.The patent document of Publication No. CN105576980A discloses a kind of electric current feedback
Electric transducer, using two transformators, and by the DC side series connection of two commutators, although can so provide larger output
Voltage, but voltage is still fixed, it is impossible to it is adjusted according to demand.
Utility model content
This utility model provides a kind of high-low pressure switching circuit of LLC conversion output, for solving above-mentioned LLC changers
The nonadjustable problem of output voltage.
A kind of high-low pressure switching circuit of LLC conversion output, including outfan, n transformer secondary and n commutator,
Wherein n is more than 1；The two ends of n-th transformer secondary connect the AC of the n-th commutator；The low pressure of m-th rectifier DC side
The high-pressure side of end the m+1 rectifier DC side of connection, wherein 0<m<n；Selection is provided between transformer secondary and outfan
Switch, for adjusting the size of the output voltage of outfan by selecting the quantity for accessing outfan commutator.
A kind of LLC conversion output high-low pressure switching circuits that this utility model is provided, are provided with multiple transformer secondaries, each
Transformer secondary is equipped with a commutator, and the DC side of these commutators is cascaded；Selecting switch is by control
The quantity of the commutator of outfan is accessed, the size of outfan output voltage can be adjusted, so as to solve the output of LLC changers
The nonadjustable problem of voltage.
Further, the selecting switch is provided with signal input port, for receiving the control signal of selecting switch.Pass through
Control signal control commutator accesses the quantity and access way of outfan, is user-friendly for operation.
Further, as n=2, the selecting switch is single-pole double-throw relay；The two of the single-pole double-throw relay
Individual moving point connects respectively the high-pressure side of two rectifier DC sides, the dead point of single-pole double-throw relay and the 2nd rectifier DC
The low-pressure end connection outfan of side, signal input port connects the coil of the single-pole double-throw relay.
Further, the selecting switch includes n+1 and single-pole double-throw switch (SPDT), two moving points of each single-pole double-throw switch (SPDT)
Connect outfan respectively, the dead point of m-th single-pole double throw connects the high-pressure side of m-th rectifier DC side, and (n+1)th hilted broadsword is double
The dead point of throw switch connects the low-pressure end of n-th rectifier DC side.The selecting switch constituted using multiple single-pole double-throw switch (SPDT)s,
The regulation of output voltage size can not only be realized, moreover it is possible to adjust the positive and negative of output voltage, and when certain commutator or sense
When answering coil to damage, only corresponding commutator need to not be selected, so as to improve the suitability of the present utility model.
Further, the n transformer secondary is the secondary of same transformator.N coil is arranged on same
In transformator, be conducive to the enforcement of LLC conversion output high-low pressure switching circuits, strengthen feasibility.
Further, the outfan is provided with filter capacitor.Ensure that outfan is defeated by arranging filter capacitor
Go out the quality of voltage.
Description of the drawings
Fig. 1 is the structure chart of LLC circuits in prior art；
Fig. 2 is the schematic diagram of the high-low pressure switching circuit of LLC conversion output in embodiment 1；
Fig. 3 is the schematic diagram of the high-low pressure switching circuit of LLC conversion output in embodiment 2.
Specific embodiment
This utility model provides a kind of high-low pressure switching circuit of LLC conversion output, for solving the output of LLC changers
The nonadjustable problem of voltage.
A kind of high-low pressure switching circuit of LLC conversion output, including outfan, n transformer secondary and n commutator,
Wherein n is more than 1；The two ends of n-th transformer secondary connect the AC of the n-th commutator；The low pressure of m-th rectifier DC side
The high-pressure side of end the m+1 rectifier DC side of connection, wherein 0<m<n；Also include selecting switch, for by selecting access defeated
Go out to hold the size of the output voltage of the quantity regulation outfan of commutator.
A kind of LLC conversion output high-low pressure switching circuits that this utility model is provided, are provided with multiple transformer secondaries, each
Transformer secondary is equipped with a commutator, and the DC side of these commutators is cascaded；Selecting switch is by control
The quantity of the commutator of outfan is accessed, the size of outfan output voltage can be adjusted, so as to solve the output of LLC changers
The nonadjustable problem of voltage.
This utility model is described in detail below in conjunction with the accompanying drawings.
Embodiment 1：
A kind of high-low pressure switching circuit of LLC that the present embodiment is provided conversion output, its schematic diagram as shown in Fig. 2 its
Middle T is transformator, and switching tube Q1, Q2, Q3 and Q4 constitute bridge inverter main circuit, the AC of the inverter circuit by electric capacity Cr and
The former limit of the oscillating circuit connection transformer T that inductance Lr is in series.The secondary of transformator T has two coils, wherein first
The AC of the first commutator that the secondary side connection of coil is made up of diode D1, D2, D3 and D4, second coil it is secondary
The AC of the second commutator that side connection is made up of diode D5, D6, D7 and D8.In the present embodiment, selecting switch is adopted
Single-pole double-throw relay REL, its dead point 4 connection outfan V+, moving point 1 connects the high-pressure side of the first rectifier DC side, moving point 2
Connect the high-pressure side of the second rectifier DC side, outfan V- connects the low-pressure end of the second rectifier DC side, the line of relay
Circle part one end connects 12V power supplys, other end connection signal transmission of electricity port, for receiving control signal by pull-up resistor
RELAY.Filter capacitor C1 is provided between outfan V+ and outfan V-.
A kind of high-low pressure switching circuit of LLC conversion outputs that the present embodiment is provided, is controlled by control signal RELAY
The switching direction of single-pole double-throw switch (SPDT).If the voltage of the first rectifier DC side output is V1, the output of the second rectifier DC side
Voltage be V2, when relay REL is connected to moving point 1, outfan output voltage be V1+V2；When relay REL is connected to
During moving point 2, the voltage of outfan output is V2, can adjust outfan with this and export different voltages.
Embodiment 2
A kind of high-low pressure switching circuit of LLC that the present embodiment is provided conversion output, its schematic diagram as shown in figure 3, its
Circuit structure is identical with the high-low pressure switching circuit of the LLC conversion outputs that embodiment 1 is provided, and difference is in the present embodiment
Selecting switch is using switch K.Selecting switch K includes three single-pole double-throw switch (SPDT)s, and its dead point is respectively contact 11, contact 21 and touches
Point 31, the moving point of first single-pole double-throw switch (SPDT) is contact 12 and contact 13, and the moving point of second single-pole double-throw switch (SPDT) is contact
22 and contact 23, the moving point of the 3rd single-pole double-throw switch (SPDT) is contact 32 and contact 33.Wherein contact 11,21 and 31 connects respectively
The low-pressure end of the high-pressure side of the first rectifier DC side, the high-pressure side of the second rectifier DC side and the second rectifier DC side；
Two moving points of each single-pole double-throw switch (SPDT) are respectively coupled two outfans V+ and V-.Signal is additionally provided with selecting switch K defeated
Enter end, by sending corresponding signal to signal input interface, the different closings of contact can be controlled, the output electricity to outfan
Pressure is adjusted.
If the first rectifier DC side output voltage be V1, the second rectifier DC side output voltage be V2, then when
Control contact 11 and contact 12 close, and when contact 21 and contact 23 close, the voltage of outfan output is V1；When control contact 11
Close with contact 12, when contact 31 and contact 33 close, the voltage of outfan output is V1+V2；When control contact 31 and contact
When 32 closures, contact 11 and contact 13 close, the voltage of outfan output is-V1-V2；Output end voltage can be adjusted with this
Size and positive and negative.
In the present embodiment, the signal controlled output voltage that selecting switch K is received according to signal input interface；As it
His embodiment, can be not provided with signal input interface, and arrange hand switch, when needing to obtain certain magnitude of voltage, pass through
Hand switch selects corresponding switch closure.
In the present embodiment, the secondary of two transformators is the secondary of same transformer secondary；As other embodiment party
Formula, for the convenience of maintenance, can adopt multiple transformators, and the former limit of these transformators is in parallel.
The specific embodiment that this utility model is related to is presented above, but this utility model is not limited to described reality
Apply mode.Under the thinking that this utility model is given, to above-mentioned by the way of being readily apparent that to those skilled in the art
Technological means in embodiment enter line translation, replacement, modification, and play a part of and the relevant art handss in this utility model
Section is essentially identical, utility model purpose that is realizing is also essentially identical, and the technical scheme for so being formed is that above-described embodiment is carried out
What fine setting was formed, this technical scheme is still fallen within protection domain of the present utility model.
Claims (6)
1. the high-low pressure switching circuit that a kind of LLC conversion is exported, including outfan, n transformer secondary and n commutator, its
Middle n is more than 1；The two ends of n-th transformer secondary connect the AC of the n-th commutator；The low-pressure end of m-th rectifier DC side
Connect the high-pressure side of the m+1 rectifier DC side, wherein 0<m<n；Characterized in that, between transformer secondary and outfan
Selecting switch is provided with, for adjusting the size of the output voltage of outfan by selecting the quantity for accessing outfan commutator.
2. the high-low pressure switching circuit that a kind of LLC conversion according to claim 1 is exported, it is characterised in that the selection
Switch is provided with signal input port, for receiving the control signal of selecting switch.
3. the high-low pressure switching circuit that a kind of LLC conversion according to claim 2 is exported, it is characterised in that as n=2,
The selecting switch is single-pole double-throw relay；It is straight that two moving points of the single-pole double-throw relay connect respectively two commutators
The low-pressure end connection outfan of the high-pressure side of stream side, the dead point of single-pole double-throw relay and the 2nd rectifier DC side, signal is defeated
Inbound port connects the coil of the single-pole double-throw relay.
4. the high-low pressure switching circuit that a kind of LLC conversion according to claim 1 is exported, it is characterised in that the selection
Switch includes n+1 and single-pole double-throw switch (SPDT), and two moving points of each single-pole double-throw switch (SPDT) connect respectively outfan, m-th hilted broadsword
The dead point of double-throw connects the high-pressure side of m-th rectifier DC side, the dead point of (n+1)th single-pole double-throw switch (SPDT) connect n-th it is whole
The low-pressure end of stream device DC side.
5. the high-low pressure switching circuit that a kind of LLC conversion according to claim 1 is exported, it is characterised in that the n change
Depressor secondary is the secondary of same transformator.
6. the high-low pressure switching circuit that a kind of LLC conversion according to claim 1 is exported, it is characterised in that the output
End is provided with filter capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621099695.4U CN206117480U (en) | 2016-09-30 | 2016-09-30 | High -low pressure switching circuit of LLC transform output |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621099695.4U CN206117480U (en) | 2016-09-30 | 2016-09-30 | High -low pressure switching circuit of LLC transform output |
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| CN206117480U true CN206117480U (en) | 2017-04-19 |
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| CN201621099695.4U Active CN206117480U (en) | 2016-09-30 | 2016-09-30 | High -low pressure switching circuit of LLC transform output |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106411109A (en) * | 2016-09-30 | 2017-02-15 | 许继电源有限公司 | High voltage and low voltage switching circuit for LLC (Logical Link Control) conversion output |
| RU181859U1 (en) * | 2017-12-21 | 2018-07-26 | Федеральное государственное автономное образовательное учреждение высшего образования "Уральский федеральный университет имени первого Президента России Б.Н. Ельцина" | DC voltage limiter |
| CN109327143A (en) * | 2018-09-27 | 2019-02-12 | 段志刚 | A kind of method and circuit for improving LLC topological power output parameter and rationally utilizing |
| CN110071647A (en) * | 2019-04-01 | 2019-07-30 | 邓依诺 | A kind of middle school student's Experiment of Electrical Circuits power-supply system |
| CN112803774A (en) * | 2019-11-14 | 2021-05-14 | 华为技术有限公司 | DC-DC conversion circuit, DC-DC converter, control method thereof and related equipment |
-
2016
- 2016-09-30 CN CN201621099695.4U patent/CN206117480U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106411109A (en) * | 2016-09-30 | 2017-02-15 | 许继电源有限公司 | High voltage and low voltage switching circuit for LLC (Logical Link Control) conversion output |
| CN106411109B (en) * | 2016-09-30 | 2019-07-26 | 许继电源有限公司 | A kind of high-low pressure switching circuit of LLC transformation output |
| RU181859U1 (en) * | 2017-12-21 | 2018-07-26 | Федеральное государственное автономное образовательное учреждение высшего образования "Уральский федеральный университет имени первого Президента России Б.Н. Ельцина" | DC voltage limiter |
| CN109327143A (en) * | 2018-09-27 | 2019-02-12 | 段志刚 | A kind of method and circuit for improving LLC topological power output parameter and rationally utilizing |
| CN110071647A (en) * | 2019-04-01 | 2019-07-30 | 邓依诺 | A kind of middle school student's Experiment of Electrical Circuits power-supply system |
| CN112803774A (en) * | 2019-11-14 | 2021-05-14 | 华为技术有限公司 | DC-DC conversion circuit, DC-DC converter, control method thereof and related equipment |
| CN112803774B (en) * | 2019-11-14 | 2023-01-13 | 华为数字能源技术有限公司 | DC-DC conversion circuit, DC-DC converter, control method thereof and related equipment |
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