CN110149051A - DC-DC converter and its control method - Google Patents
DC-DC converter and its control method Download PDFInfo
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- CN110149051A CN110149051A CN201910554700.8A CN201910554700A CN110149051A CN 110149051 A CN110149051 A CN 110149051A CN 201910554700 A CN201910554700 A CN 201910554700A CN 110149051 A CN110149051 A CN 110149051A
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- 239000003990 capacitor Substances 0.000 claims abstract description 160
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- 230000035939 shock Effects 0.000 claims abstract description 43
- 230000005611 electricity Effects 0.000 claims description 18
- 239000000758 substrate Substances 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 11
- 230000007423 decrease Effects 0.000 claims description 10
- 230000005284 excitation Effects 0.000 claims description 10
- 230000017525 heat dissipation Effects 0.000 claims description 7
- 230000001960 triggered effect Effects 0.000 claims description 3
- 239000000725 suspension Substances 0.000 description 11
- 230000005669 field effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 3
- 229910010271 silicon carbide Inorganic materials 0.000 description 3
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0083—Converters characterised by their input or output configuration
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The embodiment of the present disclosure discloses a kind of DC-DC converter and its control method, and DC-DC converter includes: bus capacitor, double tube positive exciting primary circuit, normal shock transformer, secondary side current rectifying and wave filtering circuit, booster circuit and the second diode；Wherein, one end of bus capacitor is connected by the anode of the second diode and input power, the other end of bus capacitor and the cathode of input power connect, the both ends of bus capacitor are also connect with the input terminal of double tube positive exciting primary circuit, the output end of double tube positive exciting primary circuit is connect with the input terminal of normal shock transformer, the output end of normal shock transformer is connect with the input terminal of secondary side current rectifying and wave filtering circuit, and the output end of secondary side current rectifying and wave filtering circuit is magnetically suspended bearing power supply；Booster circuit is arranged between input power and bus capacitor, for being powered for bus capacitor when the input voltage value of DC-DC converter is reduced to scheduled voltage.
Description
Technical field
This disclosure relates to field of circuit control, in particular to a kind of DC-DC converter and its control method.
Background technique
High speed rotor of motor is suspended by suspension air blower using magnetic bearing controller, eliminates the frictional force of bearing to reach
To high revolving speed, magnetic bearing controller needs stable dc power supply to power.
The DC power supply need to cope with two kinds of different operating conditions in the application of magnetic suspension field: a kind of situation is magnetic suspension air blower electricity
When net input is normal, the normal DC voltage that exports makes rotor suspension and high speed operation；Another situation is that magnetic suspension air blast
When electromechanical net input fault, which need to keep output voltage for a period of time, and rotor is made to decelerate to safe speed, this
When the direct current just allow to stop working, then magnetic bearing stops working, rotor safe falling to backup bearings.If high
Land in safe speed, be then easily damaged rotor and backup bearings, sinking speed is higher, and damage is more serious, as a result will lead to whole
Machine maintenance period shortens, and even results in motor damage.
General DC power supply power supply mode has battery UPS (uninterruptible power supply), and directly takes from frequency converter bus
Electric mode (i.e. DC-DC converter, also referred to as DC-DC converter).
Battery charger, and battery aging at any time are needed to configure using storage battery power supply mode, reduces magnetic bearing
Power supply reliability, and using UPS (uninterruptible power supply) then need the rear end UPS increase an AC-DC converter, system complex and
Price is higher.
Electricity directly is taken from motor driven frequency converter bus using DC-DC converter, uses frequency converter bus capacitor as energy
Amount buffering.When power grid input fault, system-down, the interior energy stored of frequency converter bus is used for the input of DC-DC converter, defeated
Make rotor keep suspending to magnetic bearing controller out, rotor is allowed to decelerate to safety falling velocity.
Use based on frequency converter bus as the power supply mode of energy source, when inputting electric network fault, which is protected
Holding makes rotor sustained suspension to magnetic suspension bearing power supply and slows down, and will lead to frequency converter busbar voltage rapid decrease (without power grid
Input energy).However, traditional DC-DC converter corresponds to input voltage working range relative narrower, it is lower than lower limit operating voltage
Afterwards, converter can stop exporting, and rotor sinking speed is caused to be higher than safe speed of rotation, and system is unable to reach expected maintenance time and makes
Use the service life.
Summary of the invention
In view of this, the embodiment of the present disclosure proposes a kind of DC-DC converter and its control method, it is existing to solve
Have the following problem of technology: traditional DC-DC converter corresponds to input voltage working range relative narrower, is lower than lower limit operating voltage
Afterwards, converter can stop exporting, and rotor sinking speed is caused to be higher than safe speed of rotation, and system is unable to reach expected maintenance time and makes
Use the service life.
On the one hand, the embodiment of the present invention proposes a kind of DC-DC converter, comprising: bus capacitor, double tube positive exciting are former
Current rectifying and wave filtering circuit and booster circuit in circuit, normal shock transformer, pair；Wherein, one end of the bus capacitor passes through second
The anode of diode and input power connects, and the other end of the bus capacitor is connect with the cathode of the input power, described
The both ends of bus capacitor are also connect with the input terminal of the double tube positive exciting primary circuit, the output of the double tube positive exciting primary circuit
End is connect with the input terminal of the normal shock transformer, the output end of the normal shock transformer and the secondary side current rectifying and wave filtering circuit
Input terminal connection, the output end of pair side current rectifying and wave filtering circuit is as power supply output end；The booster circuit is arranged described
Between input power and the bus capacitor, when the input voltage value of the DC-DC converter is reduced to scheduled voltage
When, the booster circuit is used to provide the output voltage of the input voltage value higher than the DC-DC converter, is the mother
Line capacitance power supply, to maintain the voltage value of the bus capacitor to be higher than the double tube positive exciting primary circuit of rear class, the normal shock
The minimum operating voltage of transformer and the secondary side current rectifying and wave filtering circuit.
In some embodiments, further includes: input EMI filter circuit, the input terminal of the input EMI filter circuit and institute
Input power connection is stated, the first output end of the input EMI filter circuit and one end of first diode connect, the input
One end of the second output terminal of EMI filter circuit and resistance connects, and the second output terminal of the input EMI filter circuit is also with the
The connection of four electronic power switches；The other end of the first diode is connect with one end of the second diode, the two or two pole
The other end of pipe is connect with one end of the bus capacitor；The other end of the other end of the bus capacitor and the resistance connects
It connects, the other end of the bus capacitor is also connect with the 4th electronic power switch.
In some embodiments, further includes: output EMI filter circuit, the input terminal of the output EMI filter circuit and institute
The output end connection of secondary side current rectifying and wave filtering circuit is stated, the output end of the output EMI filter circuit is as power supply output end.
In some embodiments, the booster circuit include: third diode, the first inductance, third electronic power switch,
First capacitor；Wherein, the other end of the third diode is connect with one end of the bus capacitor, the third diode
One end is connect with one end of first inductance, and one end of the third diode also connects with the drain electrode of third electronic power switch
It connects, the source electrode of the third electronic power switch is connect with the other end of the bus capacitor；The other end of first inductance
It is connect with one end of the first diode, the other end of first inductance is also connect with one end of the first capacitor, institute
The other end for stating first capacitor is connect with the source electrode of third electronic power switch.
In some embodiments, the input EMI filter circuit includes: the first common mode inductance and the 6th capacitor, wherein institute
The input terminal for stating the first common mode inductance is connect with the input power, and the output end of first common mode inductance is connected in parallel on described
The both ends of six capacitors.
In some embodiments, the input EMI filter circuit include: the second common mode inductance, first common mode inductance,
5th capacitor and the 6th capacitor；Wherein, the input terminal of first common mode inductance is connect with the input power, and described first is total
The output end of mould inductance is connected in parallel on the both ends of the 5th capacitor, and the output end of first common mode inductance is also total with described second
The input terminal of mould inductance connects, and the output end of second common mode inductance is connected in parallel on the both ends of the 6th capacitor.
In some embodiments, the secondary side current rectifying and wave filtering circuit includes: the 6th diode, the 7th diode, the second electricity
Sense and third capacitor；Wherein, one end of the 6th diode is connect with the first Same Name of Ends of the normal shock transformer output end,
The other end of 6th diode is connect with the other end of the 7th diode, the other end of the 6th diode also with
One end of second inductance connects, and the other end of second inductance is connect with one end of the third capacitor, the third
The other end of capacitor the first non-same polarity with one end of the 7th diode and the normal shock transformer output end respectively
Connection, output end of the both ends of the third capacitor as the secondary side current rectifying and wave filtering circuit.
In some embodiments, the secondary side current rectifying and wave filtering circuit includes: the 6th diode, the 7th diode, the eight or two
Pole pipe, the 9th diode, the second inductance, third inductance, third capacitor and the 4th capacitor；Wherein, the one of the 6th diode
End is connect with the first Same Name of Ends of the normal shock transformer output end, the other end of the 6th diode and the seven or two pole
The other end of pipe connects, and the other end of the 6th diode is also connect with one end of second inductance, second inductance
The other end connect with one end of the third capacitor, the other end of the third capacitor respectively with the 7th diode one
One end connection at end, the first non-same polarity of the normal shock transformer output end and the 4th capacitor；8th diode
One end is connect with the second Same Name of Ends of the normal shock transformer output end, the other end and the described 9th 2 of the 8th diode
The other end of pole pipe connects, and the other end of the 8th diode is also connect with one end of the 4th capacitor, the 4th electricity
The other end of appearance is connect with one end of the third inductance, and the one of the other end of the third inductance and the 9th diode
The second non-same polarity connection at end, normal shock transformer output end, one end ground connection of the third inductance；The one of the third capacitor
Output end of the other end of end and the 4th capacitor as the secondary side current rectifying and wave filtering circuit.
In some embodiments, the output EMI filter circuit includes: third common mode inductance and the 7th capacitor, wherein institute
The input terminal of third common mode inductance is stated to connect with the output end of the secondary side current rectifying and wave filtering circuit, the third common mode inductance it is defeated
Outlet is connected in parallel on the both ends of the 7th capacitor；The both ends of 7th capacitor are as the power supply output end.
In some embodiments, further include: detection circuit, driving circuit and circuit of reversed excitation；The circuit of reversed excitation with it is described
Bus capacitor connection, for powering；The detection circuit is connect with the driving circuit, for detecting the electricity of the bus capacitor
Whether pressure value is less than or equal to scheduled voltage, and is less than or equal to the scheduled voltage in the voltage value of the bus capacitor
When, the booster circuit is triggered by the driving circuit and is worked.
On the other hand, the embodiment of the present invention proposes a kind of control method of DC-DC converter, controls above-mentioned straight
Stream-DC converter, comprising: whether the input voltage value for detecting DC-DC converter is less than or equal to scheduled voltage；?
In the case that the input voltage value is less than or equal to the scheduled voltage, the booster circuit work is triggered by driving circuit
Make, to be bus capacitor power supply by the booster circuit, the voltage value of the bus capacitor is maintained to be higher than the double of rear class
The minimum operating voltage of pipe normal shock primary circuit, normal shock transformer and secondary side current rectifying and wave filtering circuit.
In some embodiments, whether the input voltage value for detecting DC-DC converter is less than or equal to predetermined voltage
Value, comprising: detect whether the input voltage value is in the decline stage；The case where the input voltage value is in the decline stage
Under, detect whether the input voltage value is less than or equal to the scheduled voltage.
In some embodiments, after triggering booster circuit work by driving circuit, further includes: detection is described defeated
Enter whether voltage value is reduced to predetermined safe voltage value；In the case where being reduced to the predetermined safe voltage value, pass through driving
Circuit disconnects the booster circuit.
On the other hand, the embodiment of the present invention proposes a kind of DC-DC converter, comprising: substrate, in the substrate
The input terminal and the output terminal is arranged in first end, be additionally provided on the substrate according to direction pivots clockwise or counter-clockwise according to
Bus capacitor, double tube positive exciting primary circuit, normal shock transformer and the secondary side current rectifying and wave filtering circuit of secondary connection, in the input terminal
Booster circuit is equipped between the sub and described bus capacitor.
It in some embodiments, further include at least one block of heat sink.
In some embodiments, at least one block of heat sink includes the first heat sink and the second heat sink, and described first
Heat dissipation channel is formed between heat sink and second heat sink, the bus capacitor and the normal shock transformer arrangement are described
In heat dissipation channel.
In some embodiments, the booster circuit include: third diode, the first inductance, third electronic power switch,
First capacitor, the third diode and the third electronic power switch are arranged on the side of first heat sink.
In some embodiments, the double tube positive exciting primary circuit includes: the 4th diode, the 5th diode, the first electricity
Power electronic switch and the second electronic power switch, wherein the 4th diode and the 5th diode setting are described the
On the one side of one heat sink, first electronic power switch and second electronic power switch setting are dissipated described first
On the another side of hot plate.
In some embodiments, the secondary side current rectifying and wave filtering circuit includes: the 6th diode, the 7th diode, the eight or two
Pole pipe, the 9th diode, the second inductance, third inductance, third capacitor and the 4th capacitor, wherein the 6th diode and
Seven diodes are arranged on the one side of second heat sink, and the 8th diode and the 9th diode are arranged in institute
On the another side for stating the second heat sink.
In some embodiments, further includes: vertical plate, setting on the substrate opposite with the first end second
End, and it is vertical with the substrate connect, circuit of reversed excitation is set on the vertical plate.
In some embodiments, further includes: input EMI filter circuit and output EMI filter circuit, the input EMI filter
Wave circuit setting is connected between the input terminal and the bus capacitor, and with the booster circuit, the output EMI
Filter circuit setting is between the secondary side current rectifying and wave filtering circuit and the output terminal.
In some embodiments, the input EMI filter circuit and the output filter circuit are separately positioned on described the
Two corners of one end.
The DC-DC converter of the embodiment of the present disclosure increases one for existing DC-DC converter
Booster circuit is then connected once encountering electric network fault in a booster circuit, keeps stabilizing the output voltage, and controls to magnetic suspension bearing
Device power supply, makes rotor that suspended state be kept to be decelerated to safe falling revolving speed from high speed operation.
Detailed description of the invention
Fig. 1 is a kind of theory structure schematic diagram for DC-DC converter that one embodiment of the disclosure provides；
Fig. 2 is the theory structure schematic diagram for another DC-DC converter that one embodiment of the disclosure provides；
Fig. 3 is the circuit diagram for another DC-DC converter that one embodiment of the disclosure provides；
Fig. 4 is the theory structure schematic diagram for another DC-DC converter that one embodiment of the disclosure provides；
Fig. 5 is the flow chart of the control method for the DC-DC converter that the another embodiment of the disclosure provides；
Fig. 6 provides the top view of DC-DC converter for the another embodiment of the disclosure；
Fig. 7 is the perspective view for the DC-DC converter that the another embodiment of the disclosure provides.
Note: 1- inputs EMI filter circuit；2- bus capacitor；3- double tube positive exciting primary circuit；4- normal shock transformer；5- pair
Side current rectifying and wave filtering circuit；6- exports EMI filter circuit；7- booster circuit；8- detection circuit；9- driving circuit；10- flyback electricity
Road；The first heat sink of 11-；The second heat sink of 13-；14- input terminal；15- output terminal；100- substrate；200- vertical plate.
Specific embodiment
In order to enable the purposes, technical schemes and advantages of the embodiment of the present disclosure are clearer, below in conjunction with disclosure reality
The technical solution of the embodiment of the present disclosure is clearly and completely described in the attached drawing for applying example.Obviously, described embodiment is
A part of this disclosure embodiment, instead of all the embodiments.Based on described embodiment of the disclosure, this field is common
Technical staff's every other embodiment obtained under the premise of being not necessarily to creative work, belongs to the model of disclosure protection
It encloses.
Unless otherwise defined, the technical term or scientific term that the disclosure uses should be tool in disclosure fields
The ordinary meaning for thering is the personage of general technical ability to be understood." first ", " second " used in the disclosure and similar word are simultaneously
Any sequence, quantity or importance are not indicated, and are used only to distinguish different component parts." comprising " or "comprising" etc.
Similar word means that the element or object before the word occur covers the element or object for appearing in the word presented hereinafter
And its it is equivalent, and it is not excluded for other elements or object.The similar word such as " connection " or " connected " is not limited to physics
Or mechanical connection, but may include electrical connection, it is either direct or indirectly."upper", "lower",
"left", "right" etc. is only used for indicating relative positional relationship, and after the absolute position for being described object changes, then the relative position is closed
System may also correspondingly change.
In order to keep the following explanation of the embodiment of the present disclosure to understand and concise, known function and known portion is omitted in the disclosure
The detailed description of part.
One embodiment of the disclosure provides a kind of DC-DC converter, and the theory structure of the DC-DC converter shows
Meaning is as shown in Figure 1, comprising:
Bus capacitor 2, double tube positive exciting primary circuit 3, normal shock transformer 4, secondary side current rectifying and wave filtering circuit 5 and booster circuit 7；
Wherein,
One end of bus capacitor is connected by the anode of the second diode and input power, the other end of bus capacitor with it is defeated
Enter the cathode connection of power supply, the both ends of bus capacitor are also connect with the input terminal of double tube positive exciting primary circuit, double tube positive exciting primary side
The output end of circuit is connect with the input terminal of normal shock transformer, and the output end of normal shock transformer is defeated with secondary side current rectifying and wave filtering circuit
Enter end connection, the output end of secondary side current rectifying and wave filtering circuit is as power supply output end；
Booster circuit is arranged between input power and bus capacitor, when the input voltage value of DC-DC converter drops
When as low as scheduled voltage, booster circuit is used to provide the output voltage of the input voltage value higher than DC-DC converter, is
Bus capacitor power supply, to maintain the voltage value of bus capacitor to be higher than double tube positive exciting primary circuit, normal shock transformer and the pair of rear class
The minimum operating voltage of side current rectifying and wave filtering circuit.
The output end of above-mentioned pair side current rectifying and wave filtering circuit can directly power for magnetically suspended bearing.
The DC-DC converter of the embodiment of the present disclosure increases one for existing DC-DC converter
Booster circuit is then connected once encountering electric network fault in a booster circuit, keeps stabilizing the output voltage, and controls to magnetic suspension bearing
Device power supply, makes rotor that suspended state be kept to be decelerated to safe falling revolving speed from high speed operation.
Above-mentioned double tube positive exciting primary circuit, normal shock transformer and secondary side current rectifying and wave filtering circuit are collectively referenced as double tube positive exciting electricity
Road, wherein the secondary current rectifying and wave filtering circuit when current rectifying and wave filtering circuit is doublewound secondary.
The embodiment of the present disclosure additionally provides another DC-DC converter, and on the basis of Fig. 1, which becomes
Parallel operation increases input EMI filter circuit 1 and output EMI filter circuit 6.The theory structure of the DC-DC converter is illustrated
As shown in Fig. 2, further comprising:
The input terminal of input EMI filter circuit is connect with input power, inputs the first output end and the of EMI filter circuit
One end of one diode connects, and one end of the second output terminal and resistance that input EMI filter circuit connects, and inputs EMI filtered electrical
The second output terminal on road is also connect with the 4th electronic power switch；One end of the other end of first diode and the second diode connects
It connects, the other end of the second diode and one end of bus capacitor connect；The other end of bus capacitor and the other end of resistance connect,
The other end of bus capacitor is also connect with the 4th electronic power switch；EMI filter circuit is exported, the defeated of EMI filter circuit is exported
Enter end to connect with the output end of secondary side current rectifying and wave filtering circuit, the output end for exporting EMI filter circuit is magnetically suspended bearing
Power supply.The 4th above-mentioned electronic power switch can be MOSFET, IGBT, thyristor, silicon carbide etc..
Above-mentioned DC-DC converter is specifically described below with reference to Fig. 3.
As shown in figure 3, inputting EMI filter circuit 1 in order to protect circuit and the specific connection structure of bus capacitor 2 including:
First output end of input EMI filter circuit is connect with the anode of first diode (i.e. D1), inputs EMI filtered electrical
One end of the second output terminal on road and thermistor (i.e. NTC, a seed type of resistance) connects, and inputs the of EMI filter circuit
Two output ends are also connected with the cathode of thyristor (i.e. TH1, a seed type of electronic power switch)；The cathode of first diode with
The anode of second diode (i.e. D2) connects, and the cathode of the second diode and the anode of bus capacitor connect；The yin of bus capacitor
Pole is connect with the other end of thermistor (i.e. NTC), and the cathode of bus capacitor is also connect with the anode of thyristor (i.e. TH1).
Above-mentioned booster circuit includes: third diode (i.e. D3), the first inductance (i.e. L1), third N-channel type field-effect tube
(i.e. T3 a, seed type of electronic power switch, can also be other types of MOSFET, IGBT, thyristor, silicon carbide etc.),
First capacitor (i.e. C1)；Wherein, the anode of the cathode of third diode and bus capacitor connects, the anode of third diode and the
One end of one inductance connects, and the anode of third diode is also connect with the drain electrode of third N-channel type field-effect tube, third N-channel
The source electrode of type field-effect tube and the cathode of bus capacitor connect；The other end of first inductance is connect with the anode of the second diode,
The other end of first inductance is also connect with the anode of first capacitor, cathode and the third N-channel type field-effect tube of first capacitor
Source electrode connection.
Above-mentioned input EMI filter circuit includes: the second common mode inductance (i.e. LF2), the 5th electricity of the first common mode inductance (i.e. LF1)
Hold (i.e. Cx1) and the 6th capacitor (i.e. Cx2)；Wherein, the input terminal of the first common mode inductance is connect with input power, the first common mode electricity
The output end of sense is connected in parallel on the both ends of the 5th capacitor, and the output end of the first common mode inductance also connects with the input terminal of the second common mode inductance
It connects, the output end of the second common mode inductance is connected in parallel on the both ends of the 6th capacitor.
Certainly, above-mentioned input EMI filter circuit can also be reduced to that a level-one common mode inductance is only arranged, it can include: the
One common mode inductance (i.e. LF1) and the 6th capacitor (i.e. Cx2), wherein the input terminal of the first common mode inductance is connect with input power, the
The output end of one common mode inductance is connected in parallel on the both ends of the 6th capacitor.
Above-mentioned pair side current rectifying and wave filtering circuit includes: the 6th diode (i.e. D6), the 7th diode (i.e. D7), the 8th diode
(i.e. D8), the 9th diode (i.e. D9), the second inductance (i.e. L2), third inductance (i.e. L3), third capacitor (i.e. C3) and the 4th electricity
Hold (i.e. C4)；Wherein, the anode of the 6th diode is connect with the first Same Name of Ends of normal shock transformer output end, the 6th diode
Cathode is connect with the cathode of the 7th diode, and the cathode of the 6th diode is also connect with one end of the second inductance, the second inductance
The other end is connect with the anode of third capacitor, and the cathode of third capacitor is defeated with the anode of the 7th diode, normal shock transformer respectively
The anode connection of the first non-same polarity and the 4th capacitor of outlet；The of the anode of 8th diode and normal shock transformer output end
The connection of two Same Name of Ends, the cathode of the 8th diode connect with the cathode of the 9th diode, and the cathode of the 8th diode is also with the 4th
The anode of capacitor connects, and the cathode of the 4th capacitor is connect with one end of third inductance, the other end of third inductance and the 9th 2 pole
The second non-same polarity connection of the anode, normal shock transformer output end of pipe, one end ground connection of third inductance；The anode of third capacitor
Output end with the cathode of the 4th capacitor as secondary side current rectifying and wave filtering circuit.
When specific implementation, above-mentioned pair side current rectifying and wave filtering circuit can be one only included above and below shown in Fig. 3 in two circuits
Branch, for example, where secondary side current rectifying and wave filtering circuit only includes the 6th diode, the 7th diode, the second inductance and third capacitor
One circuit, alternatively, secondary side current rectifying and wave filtering circuit only includes the 8th diode, the 9th diode, third inductance and the 4th capacitor
One circuit at place, those skilled in the art can be designed according to actual needs, and details are not described herein again for connection relationship.
Above-mentioned output EMI filter circuit includes: third common mode inductance (i.e. LF3) and the 7th capacitor (i.e. Cx3), wherein the
The input terminal of three common mode inductances is connect with the output end of secondary side current rectifying and wave filtering circuit, and the output end of third common mode inductance is connected in parallel on the
The both ends of seven capacitors；The both ends of 7th capacitor are as power supply output end, for example, the power supply output end can be magnetic suspension bearing control
Device power supply processed.
Above-mentioned double tube positive exciting primary circuit include two diodes (i.e. D4 and D5) and two electronic power switches (i.e. T1 with
T2 is a kind of N-channel type field-effect tube shown in figure, or other MOSFET, IGBT, silicon carbide etc.), connection is closed
System is as shown in figure 3, identical as existing double tube positive exciting primary circuit, and details are not described herein again.
On the basis of Fig. 2, the theory structure of above-mentioned DC-DC converter can also be as shown in Figure 4, comprising:
Detection circuit 8, driving circuit 9 and circuit of reversed excitation 10；
Circuit of reversed excitation is connect with bus capacitor, for detection circuit, driving circuit, double tube positive exciting primary circuit, secondary side
The power supply of the circuits such as current rectifying and wave filtering circuit；Detection circuit is connect with driving circuit, and whether the voltage value for detecting bus capacitor is small
In or be equal to scheduled voltage, and the voltage value of bus capacitor be less than or equal to scheduled voltage when, touched by driving circuit
Send out booster circuit work.
When work, when power grid input voltage is normal, booster circuit third electronic power switch (such as switch mosfet
Pipe) it closes, input power supplies the bus capacitor of wide input power via booster circuit inductance, and double tube positive exciting circuit in parallel is in mother
On line capacitance, double tube positive exciting circuit works independently at this time, and the voltage of bus capacitor is converted into the work of rear end magnetic bearing controller
Voltage.Effective input range lower limit of double tube positive exciting circuit works normally the power grid rectified current in section lower than magnetic suspension air blower
Pressure, with this design guarantee power grid input voltage be in normal range (NR) when, only double tube positive exciting circuit works independently, and reaches optimal
Reliability.
When the power grid input voltage failure of air blower, the voltage of bus capacitor works as inspection because of backend load rapid decrease
When measuring the voltage of decline more than scheduled voltage, booster circuit starting, the third electronic power switch duty ratio of booster circuit
It gradually increases, the control of booster circuit output closed-loop maintains the voltage of the wide input range DC-DC power source bus capacitor to be higher than rear class
The minimum input voltage range of double tube positive exciting circuit, and keep stable.As the voltage of bus capacitor declines, booster circuit duty
Than gradually increasing, booster circuit output voltage closed loop keeps stablizing.Guarantee double tube positive exciting circuit reliably working, exports burning voltage
Magnetic bearing controller is supplied, rotor is made to decelerate to safe falling revolving speed from the high speed operation state at electric network fault moment.
The embodiment of the present disclosure increases effective input voltage range of the DC-DC converter, DC-DC by design
Converter input voltage can be from the voltage of bus capacitor of input power grid when normal until very low voltage, the direct current-are straight
Current converter can normally be exported to magnetic bearing controller, be guaranteed when inputting electric network fault, suspended state high-speed cruising
Rotor has enough time to decelerate to safety falling velocity.
Another embodiment of the disclosure provides a kind of control method of DC-DC converter, controls above-mentioned direct current-
The process of DC converter is as shown in figure 5, include step S501 to S502:
S501 detects the input voltage value of DC-DC converter；
S502 triggers boosting electricity by driving circuit in the case where input voltage value is less than or equal to scheduled voltage
Road work, to be powered by booster circuit as bus capacitor, the double tube positive exciting for maintaining the voltage value of bus capacitor to be higher than rear class is former
The minimum operating voltage of current rectifying and wave filtering circuit in circuit, normal shock transformer and pair.
In the stage that input power is initially powered, in ascent stage when the voltage value of bus capacitor, in the rank
Input voltage value is less than scheduled voltage in section, but the process input voltage is not faulty, so missing in order to prevent
Operation, can first detect whether input voltage value is in the decline stage；Again in the case where input voltage value is in the decline stage,
Whether detection input voltage value is less than or equal to scheduled voltage.
After triggering booster circuit work by driving circuit, it can also further detect whether input voltage value reduces
To predetermined safe voltage value；In the case where being reduced to predetermined safe voltage value, illustrate that rotor slows down from high-speed cruising
To safety falling velocity, then booster circuit is disconnected by driving circuit.
The DC-DC converter of the embodiment of the present disclosure is inputting for existing DC-DC converter
A booster circuit is increased between EMI filter circuit and bus capacitor, once encountering electric network fault, busbar voltage is because by being somebody's turn to do
Wide scope input direct-current-DC converter powers to magnetically suspended bearing and goes to zero electricity from rectified voltage rapid decrease
Pressure is then connected booster circuit, keeps stabilizing the output voltage once above-mentioned condition occurs, and powers, makes to magnetically suspended bearing
Rotor keeps suspended state to be decelerated to safe falling revolving speed from high speed operation.
Another embodiment of the disclosure provides a kind of DC-DC converter, is previously mentioned for embodiment as above straight
Stream-DC converter physical product, device top view such as Fig. 6 of device setting on the circuit board of the DC-DC converter
Shown, perspective view is as shown in fig. 7, specifically include: substrate 100, the power amplifier board being equivalent in DC-DC converter, the base
Plate 100 is used to carry the circuit structure of the present embodiment, and input terminal 14 and output terminal is arranged in the first end of substrate 100
15, it is additionally provided on the substrate 100 former according to the sequentially connected bus capacitor 2 of direction pivots clockwise or counter-clockwise, double tube positive exciting
The current rectifying and wave filtering circuit 5 in circuit 3, normal shock transformer 4 and pair, bus capacitor 2 is centrally arranged on the substrate 100, so that
Cabling is most short, reduces interference and increases reliability；Input terminal 14 and output terminal 15 are arranged in the same end energy of circuit board
Enough so that the connection of the circuit board and external circuit is more convenient, in addition, input terminal 14 and output terminal 15 lean on mounting surface cloth
Set, can nearby fixed cable (cable can be fixed on mounting surface), increase connection reliability.Above-mentioned design not only makes entire straight
Stream-DC converter input-output power stream is in " several " font, and loop of power circuit is clear, whole convenient for being centrally arranged DC bus
Power circuit electromagnetic interference is reduced on body, additionally it is possible to so that the device arrangements on circuit board are more reasonable, be not only able to maximum journey
Degree utilizes the space on circuit board, moreover it is possible to signal or connection be avoided to intersect to lead to problems such as fault occur.
Above-mentioned DC-DC converter at least further includes one block of heat sink.When design, if DC-DC converter packet
Two heat sinks are included, then can use heat sink and radiate to device.It is above-mentioned include two heat sinks be the first heat sink 11
With the second heat sink 13, channel is formed between the first heat sink 11 and the second heat sink 13, is dissipated in the first heat sink 11 and second
Fin is set on hot plate 13；Bus capacitor 2 and the arrangement of normal shock transformer 4 are in the channel.Setting heat sink can on circuit boards
Effectively the heat that device operation generates on circuit board is distributed, while can be to circuit board by the way that multiple heat sinks are arranged
On space carry out classifying rationally, with the position of each device of determination, while by forming channel between the heat sink on circuit board,
The heat that system other heating devices can be generated and be gathered using channel carries out Quick diffusing, enhances overall heat dissipation effect.
In addition, highly heat-conductive material, such as heat conductive pad or heat-conducting silicone grease are set at the top of the first heat sink 11 and the second heat sink 13, it can
It the heat of heat sink is transmitted to casing surface, is radiated using outer gas stream, increases heat dissipation area.
Further, above-mentioned booster circuit 7 includes: that third diode (D3), the first inductance (L1), third power electronics are opened
Close (T3), first capacitor (C1), wherein the side of the first heat sink 11 is arranged in third diode and third electronic power switch
On.
Further, above-mentioned double tube positive exciting primary circuit 3 includes: the 4th diode (D4), the 5th diode (D5), first
Electronic power switch (T1) and the second electronic power switch (T2), wherein the 4th diode and the 5th diode are arranged first
On the one side of heat sink 11, the another of the first heat sink 11 is arranged in the first electronic power switch and the second electronic power switch
On side, electronic power switch is attached on heat sink, cooperates the fin direction of the heat sink up and down direction with channel in parallel, dissipates
The thermal efficiency is high.
Further, above-mentioned secondary side current rectifying and wave filtering circuit includes: the 6th diode (D6), the 7th diode (D7), the 8th
Diode (D8), the 9th diode (D9), the second inductance (L2), third inductance (L3), third capacitor (C3) and the 4th capacitor
(C4), wherein the 6th diode and the 7th diode are arranged on the one side of the second heat sink 13, the 8th diode and the 9th
Diode is arranged on the another side of the second heat sink 13.
The above-mentioned device arrangements by different circuits, can be more efficiently using on circuit board on different heat sinks
Space, avoid unnecessary space waste, moreover it is possible to effectively be radiated by heat sink.
Further, above-mentioned DC-DC converter further include: vertical plate 200 is equivalent in DC-DC converter
Control panel, the setting the second end opposite with first end on the substrate 100, and it is vertical with substrate 100 connect, direct current-
Control panel (i.e. vertical plate 200) and power amplifier board (i.e. substrate 100) in DC converter are provided separately, and control signal is not easy to be done
It disturbs, and control panel relative power plate right angle setting, saves space, reduce the length and size of DC-DC converter；Vertical
Circuit of reversed excitation 10 is set on plate 200.By be arranged vertical plate 200 be not only able to arrangement circuit of reversed excitation 10, moreover it is possible to so that vertical plate 200 with
Channel is formed between first heat sink 11, in order to gather heat Quick diffusing on circuit boards.In addition, posting channel-type field
The heat sink of effect pipe arranges that vulnerabilities scan signal is most short in power amplifier board cable run distance with control panel nearby, increases anti-interference.
Further, above-mentioned DC-DC converter further include: input EMI filter circuit 1 and output EMI filter circuit
6, the input setting of EMI filter circuit 1 is connected between input terminal 14 and bus capacitor 2, and with booster circuit 7, exports EMI
Filter circuit 7 is arranged between secondary side current rectifying and wave filtering circuit 6 and output terminal 15.Input EMI filter circuit 1 and output filtered electrical
Road 7 is separately positioned on two corners of first end.Input EMI filter circuit 1 is arranged with output EMI filter circuit 6 in electricity
The corner of the same end of road plate enables to the connection of the circuit board and external circuit more convenient, so that foreign current enters and leaves
Circuit board is more reasonable.
When specific setting, above-mentioned first heat sink 11 can be two heat sinks being arranged side by side, and then in each heat dissipation
Corresponding device is set on plate, and details are not described herein again for specific set-up mode.
In addition, range includes any and all based on this public affairs although exemplary embodiment has been described herein
That opens has equivalent element, modification, omission, combination (for example, scheme that various embodiments are intersected), reorganization or the implementation changed
Example.Element in claims will be construed broadly as based on the language used in claim, however it is not limited in this explanation
Described example, example are to be interpreted as nonexcludability in book or during the implementation of the application.Therefore, this specification and
Example is intended to be to be considered only as example, and real scope and spirit are by following following claims and the full scope of its equivalent institute
Instruction.
Above description is intended to illustrative rather than restrictive.For example, above-mentioned example (or one or more side
Case) it can be in combination with one another.Such as other embodiments can be used when reading foregoing description in those of ordinary skill in the art.
In addition, various features can be grouped together to simplify the disclosure in above-mentioned specific embodiment.This should not be construed as
A kind of not claimed disclosed feature is necessary intention for any claim.On the contrary, the theme of the disclosure can be with
Less than whole features of specific disclosed embodiment.To which following claims is incorporated to herein as example or embodiment
In specific embodiment, wherein each claim is independently as individual embodiment, and consider that these embodiments can be with
It is combined with each other with various combinations or arrangement.The scope of the present disclosure should refer to appended claims and these claims are entitled
The full scope of equivalent form determines.
The multiple embodiments of the disclosure are described in detail above, but the present disclosure is not limited to these specific embodiments,
Those skilled in the art can make a variety of variants and modifications embodiments on the basis of the disclosure is conceived, these modifications and repair
Change should all fall into the disclosure it is claimed within the scope of.
Claims (22)
1. a kind of DC-DC converter characterized by comprising
Bus capacitor, double tube positive exciting primary circuit, normal shock transformer, secondary side current rectifying and wave filtering circuit and booster circuit；Wherein,
One end of the bus capacitor is connected by the anode of the second diode and input power, the other end of the bus capacitor
It is connect with the cathode of the input power, the both ends of the bus capacitor also connect with the input terminal of the double tube positive exciting primary circuit
It connects, the output end of the double tube positive exciting primary circuit is connect with the input terminal of the normal shock transformer, the normal shock transformer
Output end is connect with the input terminal of the secondary side current rectifying and wave filtering circuit, and the output end of pair side current rectifying and wave filtering circuit is as power supply
Output end；
The booster circuit is arranged between the input power and the bus capacitor, when the DC-DC converter
When input voltage value is reduced to scheduled voltage, the booster circuit is used to provide defeated higher than the DC-DC converter
Enter the output voltage of voltage value, power for the bus capacitor, to maintain the voltage value of the bus capacitor to be higher than the institute of rear class
State the minimum operating voltage of double tube positive exciting primary circuit, the normal shock transformer and the secondary side current rectifying and wave filtering circuit.
2. DC-DC converter as described in claim 1, which is characterized in that further include:
EMI filter circuit is inputted, the input terminal of the input EMI filter circuit is connect with the input power, the input EMI
One end of first output end of filter circuit and first diode connects, the second output terminal of the input EMI filter circuit with
One end of resistance connects, and the second output terminal of the input EMI filter circuit is also connect with the 4th electronic power switch；
The other end of the first diode is connect with one end of the second diode, the other end of second diode with it is described
One end of bus capacitor connects；The other end of the bus capacitor is connect with the other end of the resistance, the bus capacitor
The other end is also connect with the 4th electronic power switch.
3. DC-DC converter as described in claim 1, which is characterized in that further include:
Export EMI filter circuit, the output end of the input terminal of the output EMI filter circuit and the secondary side current rectifying and wave filtering circuit
Connection, the output end of the output EMI filter circuit is as power supply output end.
4. DC-DC converter as claimed in claim 2, which is characterized in that the booster circuit includes:
Third diode, the first inductance, third electronic power switch, first capacitor；Wherein,
The other end of the third diode is connect with one end of the bus capacitor, one end of the third diode with it is described
One end of first inductance connects, and one end of the third diode is also connect with the drain electrode of third electronic power switch, and described the
The source electrode of three electronic power switches is connect with the other end of the bus capacitor；The other end of first inductance and described first
One end of diode connects, and the other end of first inductance is also connect with one end of the first capacitor, the first capacitor
The other end connect with the source electrode of third electronic power switch.
5. DC-DC converter as claimed in claim 2, which is characterized in that the input EMI filter circuit includes:
First common mode inductance and the 6th capacitor, wherein the input terminal of first common mode inductance is connect with the input power, institute
The output end for stating the first common mode inductance is connected in parallel on the both ends of the 6th capacitor.
6. method according to claim 2, which is characterized in that the input EMI filter circuit includes:
Second common mode inductance, first common mode inductance, the 5th capacitor and the 6th capacitor；
Wherein, the input terminal of first common mode inductance is connect with the input power, the output end of first common mode inductance
It is connected in parallel on the both ends of the 5th capacitor, input terminal of the output end of first common mode inductance also with second common mode inductance
Connection, the output end of second common mode inductance are connected in parallel on the both ends of the 6th capacitor.
7. DC-DC converter as described in claim 1, which is characterized in that the pair side current rectifying and wave filtering circuit includes:
6th diode, the 7th diode, the second inductance and third capacitor；Wherein,
One end of 6th diode is connect with the first Same Name of Ends of the normal shock transformer output end, the 6th diode
The other end connect with the other end of the 7th diode, the other end of the 6th diode also with second inductance
One end connection, the other end of second inductance are connect with one end of the third capacitor, the other end point of the third capacitor
It is not connect with first non-same polarity of one end of the 7th diode and the normal shock transformer output end, the third electricity
Output end of the both ends of appearance as the secondary side current rectifying and wave filtering circuit.
8. DC-DC converter as described in claim 1, which is characterized in that the pair side current rectifying and wave filtering circuit includes:
6th diode, the 7th diode, the 8th diode, the 9th diode, the second inductance, third inductance, third capacitor and
4th capacitor；Wherein,
One end of 6th diode is connect with the first Same Name of Ends of the normal shock transformer output end, the 6th diode
The other end connect with the other end of the 7th diode, the other end of the 6th diode also with second inductance
One end connection, the other end of second inductance are connect with one end of the third capacitor, the other end point of the third capacitor
Not with one end of the 7th diode, the first non-same polarity of the normal shock transformer output end and one end of the 4th capacitor
Connection；
One end of 8th diode is connect with the second Same Name of Ends of the normal shock transformer output end, the 8th diode
The other end connect with the other end of the 9th diode, the other end of the 8th diode also with the 4th capacitor
One end connection, the other end of the 4th capacitor connect with one end of the third inductance, the other end of the third inductance and
The second non-same polarity connection of one end, normal shock transformer output end of the 9th diode, a termination of the third inductance
Ground；
Output end of the other end of one end of the third capacitor and the 4th capacitor as the secondary side current rectifying and wave filtering circuit.
9. DC-DC converter as claimed in claim 3, which is characterized in that the output EMI filter circuit includes:
Third common mode inductance and the 7th capacitor, wherein the input terminal of the third common mode inductance and the secondary side rectifying and wave-filtering electricity
The output end on road connects, and the output end of the third common mode inductance is connected in parallel on the both ends of the 7th capacitor；7th capacitor
Both ends as the power supply output end.
10. DC-DC converter as claimed in any one of claims 1-9 wherein, which is characterized in that further include:
Detection circuit, driving circuit and circuit of reversed excitation；
The circuit of reversed excitation is connect with the bus capacitor, for powering；
The detection circuit is connect with the driving circuit, and whether the voltage value for detecting the bus capacitor is less than or equal to
Scheduled voltage, and when the voltage value of the bus capacitor is less than or equal to the scheduled voltage, pass through the driving electricity
Trigger the booster circuit work in road.
11. a kind of control method of DC-DC converter controls DC-DC described in any one of any one of claims 1 to 99
Converter characterized by comprising
Whether the input voltage value of detection DC-DC converter is less than or equal to scheduled voltage；
In the case where the input voltage value is less than or equal to the scheduled voltage, the boosting is triggered by driving circuit
Circuit work, to be bus capacitor power supply by the booster circuit, after maintaining the voltage value of the bus capacitor to be higher than
Double tube positive exciting primary circuit, the minimum operating voltage of normal shock transformer and secondary side current rectifying and wave filtering circuit of grade.
12. method as claimed in claim 11, which is characterized in that detect DC-DC converter input voltage value whether
Less than or equal to scheduled voltage, comprising:
Detect whether the input voltage value is in the decline stage；
In the case where the input voltage value is in the decline stage, detect the input voltage value whether be less than or equal to it is described
Scheduled voltage.
13. the method as described in claim 11 or 12, which is characterized in that trigger the booster circuit by driving circuit and work
Later, further includes:
Detect whether the input voltage value is reduced to predetermined safe voltage value；
In the case where being reduced to the predetermined safe voltage value, the booster circuit is disconnected by driving circuit.
14. a kind of DC-DC converter characterized by comprising
The input terminal and the output terminal is arranged in the first end of the substrate in substrate, be additionally provided on the substrate according to
The sequentially connected bus capacitor of direction pivots clockwise or counter-clockwise, double tube positive exciting primary circuit, normal shock transformer and secondary side are whole
Filter circuit is flowed, booster circuit is equipped between the input terminal and the bus capacitor.
15. DC-DC converter according to claim 14, which is characterized in that further include at least one block of heat sink.
16. DC-DC converter according to claim 15, which is characterized in that
At least one block of heat sink includes the first heat sink and the second heat sink, and first heat sink and described second are radiated
Heat dissipation channel is formed between plate, the bus capacitor and the normal shock transformer arrangement are in the heat dissipation channel.
17. DC-DC converter according to claim 16, which is characterized in that the booster circuit includes:
Third diode, the first inductance, third electronic power switch, first capacitor, the third diode and third electricity
Power electronic switch is arranged on the side of first heat sink.
18. DC-DC converter according to claim 16, which is characterized in that the double tube positive exciting primary circuit packet
It includes:
4th diode, the 5th diode, the first electronic power switch and the second electronic power switch, wherein the described 4th 2
Pole pipe and the 5th diode are arranged on the one side of first heat sink, first electronic power switch and described
Second electronic power switch is arranged on the another side of first heat sink.
19. DC-DC converter according to claim 16, which is characterized in that pair side current rectifying and wave filtering circuit packet
It includes:
6th diode, the 7th diode, the 8th diode, the 9th diode, the second inductance, third inductance, third capacitor and
4th capacitor, wherein the 6th diode and the 7th diode are arranged on the one side of second heat sink, and described
Eight diodes and the 9th diode are arranged on the another side of second heat sink.
20. DC-DC converter according to claim 16, which is characterized in that further include: vertical plate is arranged in institute
State the second end opposite with the first end on substrate, and it is vertical with the substrate connect, be arranged on the vertical plate anti-
Excitation circuit.
21. DC-DC converter described in any one of 4 to 20 according to claim 1, which is characterized in that further include: input
EMI filter circuit and output EMI filter circuit, the input EMI filter circuit are arranged in the input terminal and the bus
Between capacitor, and it is connected with the booster circuit, the output EMI filter circuit setting is in the secondary side current rectifying and wave filtering circuit
Between the output terminal.
22. DC-DC converter according to claim 21, which is characterized in that the input EMI filter circuit and institute
State two corners that output filter circuit is separately positioned on the first end.
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| CN201910554700.8A CN110149051A (en) | 2019-06-25 | 2019-06-25 | DC-DC converter and its control method |
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| CN201910554700.8A CN110149051A (en) | 2019-06-25 | 2019-06-25 | DC-DC converter and its control method |
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| CN111398655A (en) * | 2020-03-08 | 2020-07-10 | 苏州浪潮智能科技有限公司 | Input current detection circuit and method |
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