CN208063052U - A kind of DC-DC converter - Google Patents
A kind of DC-DC converter Download PDFInfo
- Publication number
- CN208063052U CN208063052U CN201820281610.7U CN201820281610U CN208063052U CN 208063052 U CN208063052 U CN 208063052U CN 201820281610 U CN201820281610 U CN 201820281610U CN 208063052 U CN208063052 U CN 208063052U
- Authority
- CN
- China
- Prior art keywords
- circuit
- output
- electrically connected
- component
- side winding
- 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.)
- Expired - Fee Related
Links
Abstract
The utility model discloses a kind of DC-DC converters.The DC-DC converter includes direct current-direct current conversion unit and driving unit.The first input end of driving unit is electrically connected with the second input terminal with the both ends of the primary side winding of transformer in direct current-direct current conversion unit, and multiple output ends of driving unit are electrically connected with the control terminal of the switching tube of the full bridge inverter in direct current-direct current conversion unit one-to-one correspondence.The utility model is detected the DC component in the electric current of the primary side winding of transformer by driving unit and made comparisons with given threshold, when DC component is more than given threshold, driving unit output drive signal changes the on off state of two groups of switching tubes of full bridge inverter, two groups of switching tubes are made to simultaneously turn on or end, reduce same group of switching tube switch time different problems, reduce the DC component in transformer primary side winding, it is suppressed that the bias phenomenon of transformer reduces the vibration of transformer.
Description
Technical field
The utility model embodiment is related to that the technical field of transformer bias more particularly to a kind of DC-DC is inhibited to become
Parallel operation.
Background technology
DC-DC circuit is usually used in isolated form Technics of Power Electronic Conversion as a kind of basic positive activation type circuit topological structure
In device.With the raising of performance of semiconductor device and the appearance of high-frequency soft magnetic material, high-frequency isolation type full-bridge circuit is due to it
The advantages that power density is high, volume weight is small, electric energy efficiency of transmission is high, causes everybody extensive concern.
But it due to non-linear, power switch tube the switching characteristic of iron core magnetization curve and other differences, does not do
Method accomplishes that the switch time of power switch tube is just the same, therefore the voltagesecond product that electromagnetism both forward and reverse directions are small in switch periods is uneven
Weighing apparatus can cause transformer to be saturated bias phenomenon after time integral effect, so that magnetizing inductance is reduced rapidly, single-phase magnetization
Current surge damages the power switch tube of full-bridge circuit, this also becomes the main problem of limitation DC-DC converter performance.
For the bias phenomenon in limiting transformer, traditional way is to keep the surplus of the power switch tube in full-bridge circuit sufficiently large,
And the serial capacitors in full-bridge circuit, but in low-voltage, high-current, capacitance is difficult to accomplish to inhibit the magnetic bias of transformer existing
As, and the kwh loss on capacitance is very big.
Utility model content
The utility model provides a kind of DC-DC converter, to realize full-bridge inverter in DC-DC converter
Power switch tube switch time is identical, the voltagesecond product imbalance that electromagnetism both forward and reverse directions are small in switch periods is avoided, to press down
The saturation bias phenomenon for having made transformer, improves the reliability of DC-DC converter.
In a first aspect, the utility model embodiment provides a kind of DC-DC converter, including：DC-DC is converted
Unit and driving unit；
The direct current-direct current conversion unit includes full bridge inverter and transformer, and the transformer includes primary side winding
And vice-side winding, the first output end of the full bridge inverter are electrically connected with the first end of the primary side winding, the full-bridge
The second output terminal of inverter circuit is electrically connected with the second end of the primary side winding；
The first input end of the driving unit is electrically connected with the first end of the primary side winding, and the of the driving unit
Two input terminals are electrically connected with the second end of the primary side winding, multiple output ends and the full-bridge inverting electricity of the driving unit
The control terminal of switching tube corresponds electrical connection in road, and the driving unit is for detecting the electricity for flowing through the primary side winding
When DC component in stream is more than given threshold, corresponding drive signal is exported to the control terminal of the switching tube, to change
State the on off state of switching tube.
Specifically, the driving unit includes filter circuit, amplifying circuit, comparison circuit, optical coupling isolator and output electricity
Road；
The first input end of the filter circuit is electrically connected with the first end of the primary side winding, and the of the filter circuit
Two input terminals are electrically connected with the second end of the primary side winding, the input of the output end of the filter circuit and the amplifying circuit
End electrical connection, the filter circuit are used to filter the alternating component in the electric current of the primary side winding, export the DC component；
The output end of the amplifying circuit is electrically connected with the input terminal of the comparison circuit；The output end of the comparison circuit
It is electrically connected with the input terminal of the optical coupling isolator, the comparison circuit is for comparing through the amplified direct current of the amplifying circuit
The size of component and the given threshold, and work as and be more than the given threshold through the amplified DC component of the amplifying circuit
When, output through the amplified DC component of the amplifying circuit, when being less than through the amplified DC component of the amplifying circuit or
When equal to the given threshold, the given threshold is exported；
The output end of the optical coupling isolator is electrically connected with the input terminal of the output circuit；The output of the output circuit
End be electrically connected with the control terminal of the switching tube, the output circuit for ought receive with it is amplified through the amplifying circuit
When the corresponding electric signal of DC component, output changes the drive signal of the on off state of the switching tube.
Specifically, the filter circuit includes two identical filters；The filter includes first resistor, the second electricity
Resistance, the first capacitance and the second capacitance；The first end of the first resistor is electrically connected with an input terminal of the filter circuit, the
Two ends are electrically connected with the first end of the first end of the second resistance and first capacitance, the second end of the second resistance
It is electrically connected with the first end of the output end of the filter circuit and second capacitance, the second end of first capacitance and institute
State the second end ground connection of the second capacitance.
Specifically, the amplifying circuit includes at least one amplifier.
Specifically, the comparison circuit includes first comparator, the second comparator, the first diode and the second diode；
The output end of the reverse input end and the amplifying circuit of the positive input of the first comparator and second comparator
The positive input of electrical connection, the reverse input end of the first comparator and second comparator is electrically connected with reference voltage
It connects, the output end of the first comparator is electrically connected with the anode of first diode, the output end of second comparator
With second diode anode be electrically connected, the cathode of the cathode of first diode and second diode with it is described
The output end of comparison circuit is electrically connected.
Specifically, the output circuit includes controller or voltage conversion circuit；
The controller is used to amplify with through the amplifying circuit when the control signal input of the controller is received
When the corresponding electric signal of rear DC component, directly output changes the drive signal of the on off state of the switching tube；
The voltage conversion circuit be used for when receive with through the corresponding electricity of the amplified DC component of the amplifying circuit
When signal, the electric signal received is converted into change the drive signal of the on off state of the switching tube.
Specifically, the output circuit includes controller, and the controller is additionally operable to provide initial drive for the switching tube
Dynamic signal, and when receiving electric signal corresponding with the reference voltage, keep former drive signal output.
Specifically, the output circuit further includes phase inverter, the input terminal of the phase inverter and the optical coupling isolator
Output end is electrically connected, and the output end of the phase inverter is electrically connected with the control signal input of the controller.
The utility model pass through driving unit detect transformer primary side winding electric current in DC component and with setting
Threshold value is made comparisons, and when DC component is more than given threshold, driving unit output drive signal changes two groups of full bridge inverter
The on off state of switching tube makes two groups of switching tubes simultaneously turn on or end, and it is different to reduce same group of switching tube switch time
Problem reduces the DC component in transformer primary side winding, it is suppressed that the bias phenomenon of transformer reduces shaking for transformer
It is dynamic, improve the reliability of DC-DC converter.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram for DC-DC converter that the utility model embodiment provides；
Fig. 2 is a kind of structural schematic diagram for driving unit that the utility model embodiment provides；
Fig. 3 is a kind of structural schematic diagram for optical coupling isolator that the utility model embodiment provides；
Fig. 4 show a kind of structural schematic diagram of phase inverter of the utility model embodiment offer；
Fig. 5 show a kind of structural schematic diagram of filter circuit of the utility model embodiment offer；
Fig. 6 is a kind of structural schematic diagram for amplifying circuit that the utility model embodiment provides；
Fig. 7 is a kind of structural schematic diagram for comparison circuit that the utility model embodiment provides；
Fig. 8 is the structural schematic diagram for another DC-DC converter that the utility model embodiment provides.
Specific implementation mode
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for
It is bright, it illustrates only for ease of description, in attached drawing and the relevant part of the utility model rather than entire infrastructure.
Fig. 1 is a kind of structural schematic diagram for DC-DC converter that the utility model embodiment provides, and the present embodiment can
Suitable for inhibiting the phenomenon that DC-DC converter magnetic bias, it is single which specifically includes DC-DC conversion
Member 110 and driving unit 120.
Direct current-direct current conversion unit 110 includes full bridge inverter 111 and transformer 112, and transformer 112 includes primary side
Winding 1121 and vice-side winding 1122, the first output end of full bridge inverter 111 and the first end 1111 of primary side winding 1121
Electrical connection, the second output terminal of full bridge inverter 111 are electrically connected with the second end 1112 of primary side winding 1121.
The first input end of driving unit 120 is electrically connected with the first end 1111 of primary side winding 1121, driving unit 120
Second input terminal is electrically connected with the second end 1112 of primary side winding 1121, the multiple output ends and full-bridge inverting of driving unit 120
The control terminal of switching tube corresponds electrical connection in circuit 111, and driving unit 120 is used to flow through primary side winding 1121 detecting
Electric current in DC component when being more than given threshold, export corresponding drive signal to the control terminal of switching tube, opened with changing
Close the on off state of pipe.
Specifically, as shown in Figure 1, in full bridge inverter 111,4 groups of first switch pipe T1 and the 4th switch transistor T are helped
One group of bridge inverter circuit 111, second switch pipe T2 and third switch transistor T 3 form another group of full bridge inverter 111, drive
Multiple output end output drive signals of moving cell 120 are used to control the conducting and shutdown of switching tube in full bridge inverter 111.
One output control terminal is electrically connected with the control terminal ctrl4 of the control terminal ctrl1 of first switch pipe T1 and the 4th switch transistor T 4, control
The conducting and shutdown of first switch pipe T1 and the 4th switch transistor T 4 processed；The control terminal of another output control terminal and second switch pipe T2
The control terminal ctrl3 electrical connections of ctrl2 and third switch transistor T 3, control the conducting of second switch pipe T2 and third switch transistor T 3 with
Shutdown.Full bridge inverter 111 inputs a direct current, and 120 period of driving unit is alternately connected and shutdown full bridge inverter
111 two groups of switching tubes, the primary side winding 1121 of output alternating current to transformer 112, by secondary after 112 transformer action of transformer
Side winding 1122 exports the alternating current of required voltage, and alternating current obtains required direct current after rectification circuit, completes direct current-
DC converting process.When one group of switching tube turn-on time difference in full bridge inverter 111, the primary side winding of transformer 112
It will appear DC component in 1121, cause the bias phenomenon of transformer 112, cause the excitation current waveform of transformer 112 serious
, there is spike in deformity, and the vibration of transformer 112 increases.In order to make the vibration of transformer 112 in tolerance band, driving unit 120
1121 electric current of first input end and the second input terminal acquisition transformer 112 primary side winding in DC component, and by direct current point
Amount is compared with given threshold, and wherein given threshold is reference voltage.When DC component is less than or equal to given threshold, direct current point
The vibration of transformer 112 caused by the magnetic bias generated is measured in 112 tolerance band of transformer, the output control letter of driving unit 120
Number keep full bridge inverter 111 in two groups of switching tubes on or off state.When DC component is more than given threshold, directly
The vibration of transformer 112 caused by the magnetic bias that flow component generates exceeds 112 tolerance band of transformer, and driving unit 120 is defeated at this time
Go out to control the on off state that signal changes 111 two groups of switching tubes of full bridge inverter, the switching tube shutdown of conducting, the switch of cut-off
Pipe is connected, and so that two groups of switching tubes is simultaneously turned on or is ended, reduces same group of switching tube switch time different problems, reduce
DC component in 112 primary side winding 1121 of transformer, it is suppressed that the bias phenomenon in transformer 112 reduces transformer 112
Vibration, improve the reliability of DC-DC converter.
The technical solution of the present embodiment detects the DC component in the electric current of the primary side winding of transformer by driving unit
And make comparisons with given threshold, when DC component is more than given threshold, driving unit output control signal changes full-bridge inverting
The on off state of two groups of switching tubes of circuit makes two groups of switching tubes simultaneously turn on or end, when reducing same group of switching tube switch
Between different problems, reduce the DC component in transformer primary side winding, it is suppressed that the bias phenomenon of transformer reduces change
The vibration of depressor improves the reliability of DC-DC converter.
Fig. 2 is a kind of structural schematic diagram for driving unit that the utility model embodiment provides, and Fig. 3 is that the utility model is real
Apply example offer a kind of optical coupling isolator structural schematic diagram, the present embodiment on the basis of the above embodiments, driving unit 120
Including filter circuit 121, amplifying circuit 122, comparison circuit 123, optical coupling isolator 124 and output circuit 125.
The first input end of filter circuit 121 is electrically connected with the first end 1111 of primary side winding 1121, filter circuit 121
Second input terminal is electrically connected with the second end 1112 of primary side winding 1121, output end and the amplifying circuit 122 of filter circuit 121
Input terminal is electrically connected, and filter circuit 121 is used to filter the alternating component in the electric current of primary side winding 1121, output DC component.
The output end of amplifying circuit 122 is electrically connected with the input terminal of comparison circuit 123；Compare the output end on electric 123 tunnel with
The input terminal of optical coupling isolator 124 is electrically connected, and comparison circuit 123 is for comparing through 122 amplified DC component of amplifying circuit
With the size of given threshold, and when through 122 amplified DC component of amplifying circuit be more than given threshold when, output through amplification electricity
122 amplified DC component of road, it is defeated when being less than or equal to given threshold through 122 amplified DC component of amplifying circuit
Go out given threshold.
The output end of optical coupling isolator 124 is electrically connected with the input terminal of output circuit 125；The output end of output circuit 125
It is electrically connected with the control terminal of switching tube, output circuit 125 is used to work as and receive and through 122 amplified DC component of amplifying circuit
When corresponding electric signal, output changes the drive signal of the on off state of switching tube.
As shown in Figures 2 and 3, the first input end of filter circuit 121 and 112 primary side of the second input terminal input transformer around
Electric current in group 1121, filtered circuit 121 are filtered it, filter out alternating current, the output end of filter circuit 121 is defeated
Go out the DC component of 1121 electric current of primary side winding.The DC component that filtered circuit 121 exports is input to amplifying circuit 122, puts
Big circuit 122 is amplified DC component.Using amplified DC component as the defeated of an input terminal of comparison circuit 123
Enter signal, the input signal of another input terminal of comparison circuit 123 is given threshold (reference voltage), and comparison circuit 123 compares
The size for the DC component and given threshold that amplifying circuit 122 exports, when the DC component that amplifying circuit 122 exports is more than setting
When threshold value, the DC component of 123 output amplifier 122 of comparison circuit output, flowing through the luminescent device of optical coupling isolator 124 makes
It shines, and the sensitive device of optical coupling isolator 124 just generates the first electric signal after receiving light, and output circuit 125 is according to output
The first electric signal generate the switching tube for changing full bridge inverter 111 on off state drive signal, keep full-bridge inverting electric
One group of the switching tube cut-off be connected in road 111, the switching tube conducting of another group of cut-off.When the direct current that amplifying circuit 122 exports
When component is less than or equal to given threshold, comparison circuit 123 exports given threshold, and the second electricity is generated by optical coupling isolator 124
Signal, output circuit 125 generate the on off state for the switching tube for keeping full bridge inverter 111 according to the second electric signal of output
Drive signal, so that switching tube is kept original on or off state.
On the basis of the various embodiments described above, output circuit 125 includes controller or voltage conversion circuit.
Controller is used to divide with through 122 amplified direct current of amplifying circuit when the control signal input of controller is received
When measuring corresponding electric signal, directly output changes the drive signal of the on off state of switching tube.
Voltage conversion circuit be used for when receive with through the corresponding electric signal of 122 amplified DC component of amplifying circuit
When, the electric signal received is converted into change the drive signal of the on off state of switching tube.
Specifically, when output circuit 125 includes controller, controller provides initial driving signal for switching tube.Control
The output end of device is electrically connected with multiple output ends of output circuit 125 one-to-one correspondence, is connected or is cut for output control switch pipe
Period alternate drive signal only.The drive signal of different output ends in same period is on the contrary, keep same group of switching tube same
When on or off, and it is opposite with another group of switching tube on off state.When the amplification of 123 output amplifier 122 of comparison circuit
DC component, and when being converted into the controller that the first electric signal is input in output circuit 125 by optical coupling isolator 124, control
Output is changed the drive signal of the on off state of switching tube in full bridge inverter 111 by device processed.Such as controller receives amplification
After the first electric signal that the DC component that circuit 1122 amplifies generates, controller output changes the driving of the on off state of switching tube
Signal makes the drive signal of conducting become the drive signal of cut-off, and the drive signal of cut-off becomes the drive signal of conducting, to
Realize in full bridge inverter 111 same group of switching tube end simultaneously or conducting (such as before drive signal change, switch transistor T 1
In the conduction state with T4, T2 and T3 are in cut-off state, and after changing drive signal, switch transistor T 1 and T4 are in cut-off shape
State, T2 and T3 are in the conduction state), same group of switching tube switch time different problems are reduced, it is former to reduce transformer 112
DC component in side winding 1121, it is suppressed that the bias phenomenon in transformer 112 reduces the vibration of transformer 112, improves
The reliability of DC-DC converter.When the output given threshold of comparison circuit 123 (reference voltage), and pass through light-coupled isolation
When device 124 is converted into the controller that the second electric signal is input in output circuit 125, controller keeps the former drive signal of output,
Continue to output the period alternate drive signal of control switching tube on or off.
Further include the driving letter that driving circuit is used to provide switching tube when output circuit 125 includes voltage conversion circuit
Number.Voltage conversion circuit receives the signal of 125 input terminal of output circuit, and converts thereof into corresponding with comparison circuit 123 two
The first electric signal and the second electric signal of kind output signal, the drive signal for controlling driving circuit output.Its detailed process
With output circuit 125 include controller class seemingly.
Fig. 4 show a kind of structural schematic diagram of phase inverter of the utility model embodiment offer, in the various embodiments described above
On the basis of, output circuit 125 further includes phase inverter 1251, and the input terminal in1 of phase inverter 1251 is defeated with optical coupling isolator 124
Outlet is electrically connected, and the output end out of phase inverter 1251 is electrically connected with the control signal input of controller.By the way that phase inverter is arranged
1251 can improve the transmission characteristic of output circuit 125.
Fig. 5 show a kind of structural schematic diagram of filter circuit of the utility model embodiment offer, and the present embodiment is upper
On the basis of stating embodiment, filter circuit 121 includes two identical filters；Filter includes first resistor R1, the second electricity
Hinder R2, the first capacitance C1 and the second capacitance C2；The first end of first resistor R1 and an input terminal of filter circuit 121 are electrically connected
It connects, second end is electrically connected with the first end of the first end of second resistance R2 and the first capacitance C1, the second end of second resistance R2
It is electrically connected with the first end of the output end of filter circuit 121 and the second capacitance C2, the second end of the first capacitance C1 and the second electricity
Hold the second end ground connection of C2.
Capacitance has logical exchange, hinders the effect of direct current, therefore work as 121 input transformer of filter circuit, 112 primary side winding
When 1121 electric current, AC compounent in electric current imports ground terminal by the first capacitance C1 in filter and the second capacitance C2,
DC component is exported by the output end of filter circuit 121, realizes filter action.
Fig. 6 is a kind of structural schematic diagram for amplifying circuit that the utility model embodiment provides, and the present embodiment is above-mentioned each
On the basis of embodiment, amplifying circuit 122 includes at least one amplifier OPA.
Specifically, the amplification factor reached needed for the amplifying circuit 122 is bigger, cannot be met using an amplifier and be put
When amplification factor needed for big circuit 122, series connection amplification can be carried out by using multiple amplifiers.As shown in fig. 6, for example putting
Amplification factor needed for big circuit 122 is 10000 times, the amplification factor of each amplifier OPA, then can be within 1000 times
Two amplifier OPA series connection of selection are amplified, and the total magnification of cascade amplifier OPA is 10000 times.Such as one of them
The amplification factor of amplifier OPA can be 10 times, the amplification factor of another amplifier OPA is 1000 times or two and puts
The amplification factor of big device OPA is 100 times.
Fig. 7 is a kind of structural schematic diagram for comparison circuit that the utility model embodiment provides, and the present embodiment is above-mentioned each
On the basis of embodiment, comparison circuit 123 includes first comparator COM1, the second comparator COM2, the first diode D1 and the
Two diode D2；The reverse input end and amplifying circuit of the positive input of first comparator COM1 and the second comparator COM2
122 output end electrical connection, the positive input and ginseng of the reverse input end of first comparator COM1 and the second comparator COM2
Voltage VCC electrical connections are examined, the output end of first comparator COM1 is electrically connected with the anode of the first diode D1, the second comparator
The output end of COM2 is electrically connected with the anode of the second diode D2, the cathode of the cathode of the first diode D1 and the second diode D2
It is electrically connected with the output end of comparison circuit 123.
As shown in fig. 7, the DC component that the positive input input amplifying circuit 122 of first comparator COM1 amplifies, instead
To input terminal input reference voltage VCC (given threshold)；The positive input input reference voltage VCC of second comparator COM2,
The DC component that the input amplifying circuit 122 of reverse input end amplifies.When DC component is more than reference voltage VCC, the first ratio
High level is exported compared with device COM1, the second comparator COM2 exports low level, therefore the first diode D1 conductings, the second diode D2
Cut-off.The luminescent device of the high level driving optical coupling isolator 124 of first comparator COM1 outputs at this time shines, and sensitive device will
Light is converted into the first electric signal and is input to output circuit 125.When DC component is less than or equal to reference voltage VCC, first
Comparator COM1 exports low level, and the second comparator COM2 exports high level, therefore the first diode D1 cut-offs, the second diode
D2 is connected.The luminescent device of the high level driving optical coupling isolator 124 of the second comparator COM2 outputs shines at this time, sensitive device
Light is converted into the second electric signal and is input to output circuit 125.Output circuit 125 is corresponded to according to the electric signal output received
Drive signal.
Fig. 8 is the structural schematic diagram for another DC-DC converter that the utility model embodiment provides, such as Fig. 8 institutes
Show, output circuit 125 includes phase inverter 1251 and controller, the DC component of 123 output amplifier 122 of comparison circuit amplification
When, the phase inverter 1251 that the first electric signal is input in output circuit 125, phase inverter are converted by optical coupling isolator 124
When 1251 output inversion signals are sent to controller, output is changed switching tube in full bridge inverter 111 and switchs shape by controller
The drive signal of state.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, can carry out for a person skilled in the art various bright
Aobvious variation is readjusted and is substituted without departing from the scope of protection of the utility model.Therefore, although passing through above example
The utility model is described in further detail, but the utility model is not limited only to above example, is not departing from
Can also include other more equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended
Right determine.
Claims (8)
1. a kind of DC-DC converter, which is characterized in that including：Direct current-direct current conversion unit and driving unit；
The direct current-direct current conversion unit includes full bridge inverter and transformer, and the transformer includes primary side winding and pair
First output end of side winding, the full bridge inverter is electrically connected with the first end of the primary side winding, the full-bridge inverting
The second output terminal of circuit is electrically connected with the second end of the primary side winding；
The first input end of the driving unit is electrically connected with the first end of the primary side winding, and the second of the driving unit is defeated
Enter end to be electrically connected with the second end of the primary side winding, in the multiple output ends and the full bridge inverter of the driving unit
The control terminal of switching tube corresponds electrical connection, and the driving unit is used in detecting the electric current for flowing through the primary side winding
DC component when being more than given threshold, corresponding drive signal is exported to the control terminal of the switching tube, to be opened described in change
Close the on off state of pipe.
2. DC-DC converter according to claim 1, which is characterized in that the driving unit include filter circuit,
Amplifying circuit, comparison circuit, optical coupling isolator and output circuit；
The first input end of the filter circuit is electrically connected with the first end of the primary side winding, and the second of the filter circuit is defeated
Enter end to be electrically connected with the second end of the primary side winding, the input terminal electricity of the output end of the filter circuit and the amplifying circuit
Connection, the filter circuit are used to filter the alternating component in the electric current of the primary side winding, export the DC component；
The output end of the amplifying circuit is electrically connected with the input terminal of the comparison circuit；The output end of the comparison circuit and institute
The input terminal electrical connection of optical coupling isolator is stated, the comparison circuit is for comparing through the amplified DC component of the amplifying circuit
With the size of the given threshold, and when through the amplified DC component of the amplifying circuit be more than the given threshold when, it is defeated
Go out through the amplified DC component of the amplifying circuit, when being less than or equal to institute through the amplified DC component of the amplifying circuit
When stating given threshold, the given threshold is exported；
The output end of the optical coupling isolator is electrically connected with the input terminal of the output circuit；The output end of the output circuit with
The control terminal of the switching tube is electrically connected, and the output circuit is used to work as and receive and through the amplified direct current of the amplifying circuit
When the corresponding electric signal of component, output changes the drive signal of the on off state of the switching tube.
3. DC-DC converter according to claim 2, which is characterized in that the filter circuit includes two identical
Filter；The filter includes first resistor, second resistance, the first capacitance and the second capacitance；The of the first resistor
One end is electrically connected with an input terminal of the filter circuit, the first end and described first of second end and the second resistance
The first end of capacitance is electrically connected, output end and second capacitance of the second end of the second resistance with the filter circuit
First end electrical connection, the second end ground connection of the second end of first capacitance and second capacitance.
4. DC-DC converter according to claim 2, which is characterized in that the amplifying circuit includes at least one
Amplifier.
5. DC-DC converter according to claim 2, which is characterized in that the comparison circuit compares including first
Device, the second comparator, the first diode and the second diode；The positive input of the first comparator and described second compares
The reverse input end of device is electrically connected with the output end of the amplifying circuit, the reverse input end of the first comparator and described
The positive input of two comparators is electrically connected with reference voltage, the output end of the first comparator and first diode
Anode electrical connection, the output end of second comparator are electrically connected with the anode of second diode, first diode
Cathode and the cathode of second diode be electrically connected with the output end of the comparison circuit.
6. DC-DC converter according to claim 2, which is characterized in that the output circuit include controller or
Voltage conversion circuit；
The controller be used for when the controller control signal input receive with it is amplified through the amplifying circuit
When the corresponding electric signal of DC component, directly output changes the drive signal of the on off state of the switching tube；
The voltage conversion circuit be used for when receive with through the corresponding electric signal of the amplified DC component of the amplifying circuit
When, the electric signal received is converted into change the drive signal of the on off state of the switching tube.
7. DC-DC converter according to claim 6, which is characterized in that the output circuit includes controller, institute
It states controller to be additionally operable to provide initial driving signal for the switching tube, and works as and receive electric signal corresponding with reference voltage
When, keep former drive signal output.
8. DC-DC converter according to claim 7, which is characterized in that the output circuit further includes phase inverter,
The input terminal of the phase inverter is electrically connected with the output end of the optical coupling isolator, the output end of the phase inverter and the control
The control signal input of device is electrically connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820281610.7U CN208063052U (en) | 2018-02-28 | 2018-02-28 | A kind of DC-DC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820281610.7U CN208063052U (en) | 2018-02-28 | 2018-02-28 | A kind of DC-DC converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208063052U true CN208063052U (en) | 2018-11-06 |
Family
ID=63991487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820281610.7U Expired - Fee Related CN208063052U (en) | 2018-02-28 | 2018-02-28 | A kind of DC-DC converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208063052U (en) |
-
2018
- 2018-02-28 CN CN201820281610.7U patent/CN208063052U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109742968B (en) | Diode clamping hybrid three-level double-active full-bridge converter and control method thereof | |
| CN107968571B (en) | A kind of double active three phase-shifting control methods of bridging parallel operation | |
| CN107241020A (en) | Resonance DC/DC converter | |
| CN107017781A (en) | The ISOP full-bridge direct current converters and its control method of asymmetrical PWM control | |
| CN203814013U (en) | LED driving circuit adopting single-end zero crossing detection | |
| CN107493017A (en) | A kind of multiport bidirectional DC/DC converter topology based on CLLC | |
| CN108988646B (en) | DAB (digital audio broadcasting) optimization control method with voltage transmission ratio larger than 1 under zero-voltage switch | |
| CN110034686A (en) | Double active bridging parallel operations based on SiC-Si combined power semiconductor device switch | |
| CN107276374A (en) | A kind of asymmetrical half-bridge flyback drive circuit | |
| CN107105543B (en) | A kind of backlight LED drive circuit | |
| CN208063052U (en) | A kind of DC-DC converter | |
| CN103762875B (en) | A kind of asymmetric dual output Z source half-bridge converter | |
| CN108418433A (en) | A kind of LLC resonant converter and its control circuit, resonance current sample circuit | |
| CN105226925B (en) | A kind of inverse-excitation type single-phase inverter and its control method | |
| CN102255513B (en) | Bridge type synchronous rectification circuit | |
| CN207968333U (en) | A kind of LLC resonant converter and its control circuit, resonance current sample circuit | |
| CN104280592B (en) | A kind of passive and nondestructive high frequency Magnetic isolation type DC voltage detects circuit | |
| CN206922641U (en) | A kind of asymmetrical half-bridge flyback drive circuit | |
| CN206602458U (en) | A kind of full-bridge controlled resonant converter | |
| CN101741362A (en) | Insulated gate device control method and circuit thereof | |
| CN1325215C (en) | Cyclic superimposed chopper energy-saving pulse power source for spark machining | |
| CN205355881U (en) | AdjacentCell -to -Cell equalizer circuit based on transform of three resonant condition LC | |
| CN105429494B (en) | A kind of inverter power supply device and its control method | |
| CN209283095U (en) | A kind of switching capacity type high-gain DC/DC converter based on coupling inductance | |
| CN208675209U (en) | High-power high-efficiency sonar transmitter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181106 Termination date: 20200228 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |