CN109167518A - A kind of vehicle power supply bidirectional DC-DC converter and its control method - Google Patents
A kind of vehicle power supply bidirectional DC-DC converter and its control method Download PDFInfo
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- CN109167518A CN109167518A CN201811203061.2A CN201811203061A CN109167518A CN 109167518 A CN109167518 A CN 109167518A CN 201811203061 A CN201811203061 A CN 201811203061A CN 109167518 A CN109167518 A CN 109167518A
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- 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
- H02M3/325—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 using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—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 using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—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 using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
-
- 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
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Inverter Devices (AREA)
Abstract
The present invention proposes a kind of vehicle power supply bidirectional DC-DC converter and its control method; the invention belongs to electronic power converter fields, comprising: direct current contact net voltage input, filter protective circuit, double half-bridge series inverters and rectification circuit, high frequency transformer, full-bridge inverter and diode rectifier circuit, filter circuit, low pressure energy storage device, high side voltage constant detection circuit, low-pressure side voltage constant detection circuit, low-pressure side current spike detection circuit, control module, drive module, PWM generator, accessory power supply；Using circuit topological structure of the present invention, the pressure voltage of high-pressure side IGBT pipe is reduced, is reduced costs, vehicle power supply volume is reduced, vehicle power supply stability is enhanced, simultaneously as using bidirectional DC-DC converter, the two-way flow for realizing energy improves the service efficiency of energy.
Description
Technical field
The invention belongs to electronic power converter fields, and in particular to a kind of vehicle power supply bidirectional DC-DC converter
And its control method.
Background technique
For existing electric mine locomotive vehicle power supply DC-DC converter, generally double half-bridge tandem type Uniderectional DC-DCs
Converter.Its advantage is that structure is simple, the pressure voltage of IGBT is reduced, the disadvantage is that not accounting for vehicle-mounted energy storage and energy back is asked
Topic, capacity usage ratio are lower.And for new type mining electric locomotive vehicle power supply bidirectional DC-DC converter, it is realized
The two-way flow of energy improves the service efficiency of energy, when electric locomotive be in starting, accelerate, climbing when, demand power compared with
Greatly, vehicle power supply receives the 1500V DC voltage from contact net at this time, supplies to load, low-voltage control circuit and lighting system
Electricity, while charging to composite energy storage system；When electric locomotive is in braking or slows down, composite energy storage system can be by storage
Energy feedback is to power grid.Because a kind of novel two-way vehicle power supply DC-DC converter of the invention has very big value.
Summary of the invention
Based on defect of the existing technology, the invention proposes a kind of vehicle power supply bidirectional DC-DC converter and its controls
Method processed, comprising:
Direct current contact net voltage input, filter protective circuit, double half-bridge series inverters and rectification circuit, high frequency transformation
It is device, full-bridge inverter and diode rectifier circuit, filter circuit, low pressure energy storage device, high side voltage constant detection circuit, low
Press side voltage constant detection circuit, low-pressure side current spike detection circuit, control module, drive module, PWM generator, auxiliary
Power supply；
Direct current contact net voltage input is connected with filter protective circuit, filter protective circuit and double half-bridge series inverters
And rectification circuit is connected, double half-bridge series inverters and rectification circuit are connected with PWM generator and high frequency transformer respectively,
High frequency transformer is connected with full-bridge inverter and diode rectifier circuit, full-bridge inverter and diode rectifier circuit and filtering
Circuit is connected, and filter circuit is connected with low pressure energy storage device, and low pressure energy storage device is detected with low-pressure side voltage constant respectively
Circuit is connected with low-pressure side current spike detection circuit, and PWM generator is connected with drive module, drive module and control mould
Block is connected, control module respectively with low-pressure side voltage constant detection circuit, high side voltage constant detection circuit and low-pressure side
Current spike detection circuit is connected；Accessory power supply is connected with control module；
Direct current contact net voltage input provides the input of 1500V high-voltage dc voltage；
Filter protective circuit includes filter circuit and rc protection circuit, and filter circuit uses direct current reactor L1, is used to
Input power ripple current is absorbed, which subtracts for improving input current abnormality caused by capacitor filtering, improving power factor
The problems such as less and preventing dash current from causing rectifier bridge damage and capacitor overheat；Rc protection circuit, including C1, C2, C3, C4 with
R1,R2,R3,R4；Rc protection circuit ensure that the partial pressure of capacitor is uniform, and C1~C4 is the identical DC bus electricity of four models
Capacitor is solved, avoids certain capacitors receiving voltages excessive, brings danger to inverter, use series connection to provide enough pressure voltages,
The main function of dc-link capacitance is to absorb ripple current, keeps system output more stable.R1~R4 is to be connected in parallel on this four
The equalizing resistance at capacitor both ends ensure that the partial pressure of capacitor is uniform, avoids certain capacitors receiving voltages excessive, brings to inverter
It is dangerous；Also, when system-down, which may also function as the effect for allowing the electric energy on filter capacitor to discharge completely.Capacitance-resistance is protected
Shield can only protect excessively high voltage build-up rate, as inhibited the peak voltage wave in power grid.When peaked wave comes, because of the electricity on capacitor
Pressure cannot be mutated, and the voltage of peaked wave can be applied directly on the resistance being connected in series to the capacitor, and the resistance value being connected in series to the capacitor is smaller
(only tens ohm), the energy of peaked wave is consumed on resistance, to reduce immediately the voltage amplitude of peaked wave.When normal
When operation, the capacitive reactance of capacitor is much larger than resistance (difference hundred times), the electric current very little of the road of capacitance-resistance, so ohmically power
Consume very little.
Double half-bridge series inverters and rectification circuit are rectified using double half-bridge tandem type structure inversions and freewheeling diode,
It is high-frequency alternating current by high voltage direct current inversion；Bridge arm capacitor Ca, Cb, resonant inductance Le, resonant capacitance Ce, transformer primary side around
Group N1, switching tube Q1, Q2 and VT1, VT2 constitute half-bridge circuit；Wherein Q1, VT1 form an IGBT unit, Q2, VT2 group
At another IGBT unit, the two units, which are packaged together, constitutes the IGBT module of Unit two, likewise, lower half-bridge
Circuit has an identical structure: bridge arm capacitor Cc, Cd, resonant inductance Lf, resonant capacitance Cf, transformer primary winding N2, switch
Pipe Q3, Q4 and VT3, VT4 constitute lower half-bridge circuit；Wherein Q3, VT3 form an IGBT unit, and Q4, VT4 form another
IGBT unit, the two units, which are packaged together, constitutes the IGBT module of Unit two；Resonant capacitance Ce and resonant inductance
Le is connected, and resonant inductance Le is connected with transformer primary winding N1；
A noninductive capacitor in parallel, i.e. Ca, Cb, Cc, Cd are needed on every group of IGBT, effect is that absorbing circuit plate is female
Row is the due to voltage spikes on positive and negative copper bar, cuts down high-frequency impulse energy, prevents the property difference due to two switching tubes and cause
Magnetic core of transformer saturation protects high power tube to improve the anti-unbalance voltage capability of half-bridge inversion circuit；
Double half-bridge series inverters and rectification circuit use Sofe Switch harmonic technology, due to DC-DC converter middle line
The presence of road stray inductance, transformer leakage inductance and device parasitic capacitor etc., causes switching device to be opened, voltage in turn off process
It cannot mutate with electric current, during this leads to the turning on and off of switching device, there is overlapping in voltage and current, this
Overlapping phenomenon produces switching loss.The invention uses soft switch technique in main circuit, says by taking half-bridge on high-pressure side as an example
Bright, Le, Ce, Q1, Q2 and leakage inductance of transformer constitute series resonant tank, rely on series resonant tank, so that it may play and prolong
The effect that slow electric current rises, to realize Zero Current Switch (ZCS) conducting, including Le, Ce, Lf, Cf, Lg, Cg；
High frequency transformer, when vehicle power supply bidirectional DC-DC converter is in decompression reversals, high frequency transformer will be high
Pressure alternating current becomes low-voltage AC；When vehicle power supply bidirectional DC-DC converter is in boosting reversals, high frequency transformer
Low-voltage AC is become into High Level AC Voltage；
Full-bridge inverter and diode rectifier circuit are rectified using full bridge structure inversion and freewheeling diode, by low-pressure direct
Galvanic electricity inversion is high-frequency alternating current, including Q5, Q6, VT5, VT6, Q7, Q8, VT7, VT8, Lg, Cg；Resonant inductance Lg and resonance electricity
Hold Cg to be connected, resonant capacitance Cg is connected with transformer primary winding N3, and switching tube Q5, Q6 and VT5, VT6 constitute one
Bridge arm；Switching tube Q7, VT7 and Q8, VT8 form another bridge arm；
Filter circuit is absorbed ripple current, is kept vehicle power supply bidirectional DC-DC converter defeated using C5 filtering capacitance of voltage regulation
The DC low-voltage of straight pulse free out；
High side voltage constant detection circuit detects vehicle power supply bidirectional DC-DC converter high side voltage value, and will inspection
The high tension voltage value measured feeds back to control module；
Low-pressure side voltage constant detection circuit detects vehicle power supply bidirectional DC-DC converter low-pressure side voltage value, and will inspection
The low voltage value measured feeds back to control module；
Low-pressure side current spike detection circuit detects vehicle power supply bidirectional DC-DC converter low-pressure side current spike value, and
The low-tension current kurtosis that will test feeds back to control module；
Control module is to control PWM for analyzing voltage and current acquisition parameter using single-chip microcontroller as central processing unit
Generator adjusts the turn-on time of IGBT, and then adjusts output voltage precision；
Drive module provides driving for IGBT；
PWM generator is controlled by control module, adjusts the turn-on time of IGBT；
Accessory power supply is control module, drive module, high side voltage constant detection circuit, the inspection of low-pressure side voltage constant
Slowdown monitoring circuit and the power supply of low-pressure side current spike detection circuit,
Low pressure energy storage device provides constant low pressure source for vehicle power supply bidirectional DC-DC converter, and inputs and contact in direct current
When power grid cannot work, power supply is worked normally for electric locomotive；
A kind of control method of vehicle power supply bidirectional DC-DC converter, using a kind of vehicle power supply bidirectional DC-DC converter
It is controlled, the reversals including decompression use Bipolar control, and the reversals of boosting use phase shifting control.
The reversals of decompression use Bipolar control:
When converter works in decompression mode, DC voltage contact net passes through high frequency transformer to low-pressure side composite energy storage
Device is powered, and in the case of normal power supply, using double half-bridge inverters of Bipolar control mode, switching tube Q1, Q2, Q3, Q4 are adopted
It is PWM control mode, in a switch periods TsFirst half cycle in, switching tube Q1 and Q3 conducting, turn-on time Ton；
Later half period switching tube Q2 and Q4 conducting, turn-on time is also Ton, in switching tube Q1 and Q3 conducting, if disregarding switching tube
On-state voltage drop, then the voltage on primary winding is uab, voltage in switching tube Q2 and Q4 conducting, on armature winding
For-uab；Voltage u when switching tube Q1 and Q3 and Q2 and Q4 are turned off, on armature windingab=0, regulating switch pipe it is open-minded
Turn-off time, that is, adjust duty ratio Du, so that it may adjust voltage uabPulse width, thus reach adjust uabVirtual value size
Purpose, it is final to realize voltage control.
The reversals of boosting use phase shifting control:
For the low-pressure side of high frequency transformer, work as Q5, Q8 conducting, when Q6, Q7 end, vehicle power supply composite energy storing device is mentioned
The DC voltage of confession can be by Q5, Q8, using Cg, and Lg series resonance is added to the both ends of high frequency transformer N3, polarity be it is upper just
It is lower negative, work as Q6, Q7 conducting, when Q5, Q8 end, 60V DC voltage can be by Q6, Q7, and using Cg, Lg series resonance is added to height
The both ends of frequency power transformer N3, polarity are lower just upper negative, can be thus vehicle-mounted in the secondary side of high frequency transformer one amplitude of generation
Power supply composite energy storing device provide DC voltage amplitude positive and negative square-wave voltage, the square-wave voltage by high frequency transformer, when
N1, N2 polarity be it is upper just under it is negative when, N1 voltage first passes through the freewheeling diode VT1 rectification of double half-bridge circuits, then passes through Ce filtering
Capacitor, Le filter inductance export the direct current contact net voltage of half, and N2 voltage first passes through two pole of afterflow of double half-bridge circuits
Pipe VT1, VT2, VT3 rectification, then by Cf filter capacitor, Lf filter inductance exports the direct current contact net voltage of half,
N1, N2 output voltage merge into direct current contact net voltage, work as N1, when N2 polarity is lower just upper negative, N1 voltage first passes through Ce filtering
Capacitor, Le filter inductance, then by freewheeling diode VT2, VT3, VT4 rectification of double half-bridge circuits, export the straight of half
Contact net voltage is flowed, N2 voltage first passes through Cf filter capacitor, Lf filter inductance, then the freewheeling diode by double half-bridge circuits
VT4 rectification, exports the direct current contact net voltage of half, N1, and N2 output voltage, which merges into output voltage and merges into direct current, to be connect
Electric energy is fed back to DC voltage contact net by net-fault voltage, final realize.
Advantageous effects:
Using the invention circuit topological structure, the pressure voltage of high-pressure side IGBT pipe is reduced, is reduced costs, vehicle is reduced
Power volume is carried, vehicle power supply stability is enhanced.Simultaneously as realizing the two-way of energy using bidirectional DC-DC converter
Flowing, improves the service efficiency of energy.
Detailed description of the invention
A kind of vehicle power supply bidirectional DC-DC converter structural block diagram of Fig. 1 embodiment of the present invention；
A kind of vehicle power supply bidirectional DC-DC converter system block diagram of Fig. 2 embodiment of the present invention；
A kind of vehicle power supply bidirectional DC-DC converter main circuit topological structure of Fig. 3 embodiment of the present invention；
The decompression mode equivalent circuit of Fig. 4 embodiment of the present invention；
The main waveform of decompression mode Bipolar control of Fig. 5 embodiment of the present invention；
The boost mode equivalent circuit of Fig. 6 embodiment of the present invention；
The converter boost phase shifting control waveform diagram of Fig. 7 embodiment of the present invention.
Specific embodiment
Technical solution of the present invention is described in detail with reference to the accompanying drawing, it is double that the invention proposes a kind of vehicle power supplies
To DC-DC converter and its control method, as shown in Figure 1 and Figure 2, comprising:
Direct current contact net voltage input, filter protective circuit, double half-bridge series inverters and rectification circuit, high frequency transformation
It is device, full-bridge inverter and diode rectifier circuit, filter circuit, low pressure energy storage device, high side voltage constant detection circuit, low
Press side voltage constant detection circuit, low-pressure side current spike detection circuit, control module, drive module, PWM generator, auxiliary
Power supply；
Direct current contact net voltage input is connected with filter protective circuit, filter protective circuit and double half-bridge series inverters
And rectification circuit is connected, double half-bridge series inverters and rectification circuit are connected with PWM generator and high frequency transformer respectively,
High frequency transformer is connected with full-bridge inverter and diode rectifier circuit, full-bridge inverter and diode rectifier circuit and filtering
Circuit is connected, and filter circuit is connected with low pressure energy storage device, and low pressure energy storage device is detected with low-pressure side voltage constant respectively
Circuit is connected with low-pressure side current spike detection circuit, and PWM generator is connected with drive module, drive module and control mould
Block is connected, control module respectively with low-pressure side voltage constant detection circuit, high side voltage constant detection circuit and low-pressure side
Current spike detection circuit is connected；Accessory power supply is connected with control module；
Direct current contact net voltage input provides the input of 1500V high-voltage dc voltage；
Filter protective circuit includes filter circuit and rc protection circuit, and filter circuit uses direct current reactor L1, is used to
Input power ripple current is absorbed, which subtracts for improving input current abnormality caused by capacitor filtering, improving power factor
The problems such as less and preventing dash current from causing rectifier bridge damage and capacitor overheat；Rc protection circuit, including C1, C2, C3, C4 with
R1,R2,R3,R4；Rc protection circuit ensure that the partial pressure of capacitor is uniform, and C1~C4 is the identical DC bus electricity of four models
Capacitor is solved, avoids certain capacitors receiving voltages excessive, brings danger to inverter, use series connection to provide enough pressure voltages,
The main function of dc-link capacitance is to absorb ripple current, keeps system output more stable.R1~R4 is to be connected in parallel on this four
The equalizing resistance at capacitor both ends ensure that the partial pressure of capacitor is uniform, avoids certain capacitors receiving voltages excessive, brings to inverter
It is dangerous；Also, when system-down, which may also function as the effect for allowing the electric energy on filter capacitor to discharge completely.Capacitance-resistance is protected
Shield can only protect excessively high voltage build-up rate, as inhibited the peak voltage wave in power grid.When peaked wave comes, because of the electricity on capacitor
Pressure cannot be mutated, and the voltage of peaked wave can be applied directly on the resistance being connected in series to the capacitor, and the resistance value being connected in series to the capacitor is smaller
(only tens ohm), the energy of peaked wave is consumed on resistance, to reduce immediately the voltage amplitude of peaked wave.When normal
When operation, the capacitive reactance of capacitor is much larger than resistance (difference hundred times), the electric current very little of the road of capacitance-resistance, so ohmically power
Consume very little.
Double half-bridge series inverters and rectification circuit are rectified using double half-bridge tandem type structure inversions and freewheeling diode,
It is high-frequency alternating current by high voltage direct current inversion；Bridge arm capacitor Ca, Cb, resonant inductance Le, resonant capacitance Ce, transformer primary side around
Group N1, switching tube Q1, Q2 and VT1, VT2 constitute half-bridge circuit；Wherein Q1, VT1 form an IGBT unit, Q2, VT2 group
At another IGBT unit, the two units, which are packaged together, constitutes the IGBT module of Unit two, likewise, lower half-bridge
Circuit has an identical structure: bridge arm capacitor Cc, Cd, resonant inductance Lf, resonant capacitance Cf, transformer primary winding N2, switch
Pipe Q3, Q4 and VT3, VT4 constitute lower half-bridge circuit；Wherein Q3, VT3 form an IGBT unit, and Q4, VT4 form another
IGBT unit, the two units, which are packaged together, constitutes the IGBT module of Unit two；Resonant capacitance Ce and resonant inductance
Le is connected, and resonant inductance Le is connected with transformer primary winding N1；
A noninductive capacitor in parallel, i.e. Ca, Cb, Cc, Cd are needed on every group of IGBT, effect is that absorbing circuit plate is female
Row is the due to voltage spikes on positive and negative copper bar, cuts down high-frequency impulse energy, prevents the property difference due to two switching tubes and cause
Magnetic core of transformer saturation protects high power tube to improve the anti-unbalance voltage capability of half-bridge inversion circuit；
Double half-bridge series inverters and rectification circuit use Sofe Switch harmonic technology, due to DC-DC converter middle line
The presence of road stray inductance, transformer leakage inductance and device parasitic capacitor etc., causes switching device to be opened, voltage in turn off process
It cannot mutate with electric current, during this leads to the turning on and off of switching device, there is overlapping in voltage and current, this
Overlapping phenomenon produces switching loss.The invention uses soft switch technique in main circuit, says by taking half-bridge on high-pressure side as an example
Bright, Le, Ce, Q1, Q2 and leakage inductance of transformer constitute series resonant tank, rely on series resonant tank, so that it may play and prolong
The effect that slow electric current rises, to realize Zero Current Switch (ZCS) conducting, including Le, Ce, Lf, Cf, Lg, Cg；
High frequency transformer, when vehicle power supply bidirectional DC-DC converter is in decompression reversals, high frequency transformer will be high
Pressure alternating current becomes low-voltage AC；When vehicle power supply bidirectional DC-DC converter is in boosting reversals, high frequency transformer
Low-voltage AC is become into High Level AC Voltage；
Full-bridge inverter and diode rectifier circuit are rectified using full bridge structure inversion and freewheeling diode, by low-pressure direct
Galvanic electricity inversion is high-frequency alternating current, including Q5, Q6, VT5, VT6, Q7, Q8, VT7, VT8, Lg, Cg；Resonant inductance Lg and resonance electricity
Hold Cg to be connected, resonant capacitance Cg is connected with transformer primary winding N3, and switching tube Q5, Q6 and VT5, VT6 constitute one
Bridge arm；Switching tube Q7, VT7 and Q8, VT8 form another bridge arm；
Filter circuit is absorbed ripple current, is kept vehicle power supply bidirectional DC-DC converter defeated using C5 filtering capacitance of voltage regulation
The DC low-voltage of straight pulse free out；
High side voltage constant detection circuit detects vehicle power supply bidirectional DC-DC converter high side voltage value, and will inspection
The high tension voltage value measured feeds back to control module；
Low-pressure side voltage constant detection circuit detects vehicle power supply bidirectional DC-DC converter low-pressure side voltage value, and will inspection
The low voltage value measured feeds back to control module；
Low-pressure side current spike detection circuit detects vehicle power supply bidirectional DC-DC converter low-pressure side current spike value, and
The low-tension current kurtosis that will test feeds back to control module；
Control module, as shown in Fig. 2, being for analyzing voltage and current acquisition ginseng using single-chip microcontroller as central processing unit
Number controls PWM generator, adjusts the turn-on time of IGBT, and then adjust output voltage precision；
Drive module provides driving for IGBT；
PWM generator is controlled by control module, adjusts the turn-on time of IGBT；
Accessory power supply is control module, drive module, high side voltage constant detection circuit, the inspection of low-pressure side voltage constant
Slowdown monitoring circuit and the power supply of low-pressure side current spike detection circuit,
Low pressure energy storage device provides constant low pressure source for vehicle power supply bidirectional DC-DC converter；
A kind of control method of vehicle power supply bidirectional DC-DC converter, using a kind of vehicle power supply bidirectional DC-DC converter
It is controlled, the reversals including decompression use Bipolar control, and the reversals of boosting use phase shifting control.
The reversals of decompression use Bipolar control: when converter works in decompression mode, DC voltage contact net
It is powered by high frequency transformer to low-pressure side composite energy storing device, in the case of normal power supply, using the double of Bipolar control mode
Half-bridge inverter, switching tube Q1, Q2, Q3, Q4 are using PWM control mode, in a switch periods TsFirst half cycle in,
Switching tube Q1 and Q3 conducting, turn-on time Ton；Later half period switching tube Q2 and Q4 conducting, turn-on time is also Ton, switching
When pipe Q1 and Q3 are connected, if disregarding the on-state voltage drop of switching tube, the voltage on primary winding is uab, in switching tube
When Q2 and Q4 is connected, the voltage on armature winding is-uab；When switching tube Q1 and Q3 and Q2 and Q4 are turned off, on armature winding
Voltage uab=0, regulating switch pipe is opened the turn-off time, that is, adjusts duty ratio Du, so that it may adjust voltage uabPulse
Width adjusts u to reachabThe purpose of virtual value size, it is final to realize voltage control.
The reversals of boosting use phase shifting control: for the low-pressure side of high frequency transformer, working as Q5, Q8 conducting, Q6, Q7 are cut
When only, the DC voltage that vehicle power supply composite energy storing device provides can be by Q5, Q8, and using Cg, Lg series resonance is added to height
The both ends of frequency power transformer N3, polarity be it is upper just lower negative, work as Q6, Q7 conducting, when Q5, Q8 end, 60V DC voltage can by Q6,
Q7, using Cg, Lg series resonance is added to the both ends of high frequency transformer N3, and polarity is just above born to be lower, can thus be become in high frequency
The secondary side of depressor generates the positive and negative square-wave voltage that an amplitude is the DC voltage amplitude that vehicle power supply composite energy storing device provides,
The square-wave voltage by high frequency transformer, work as N1, N2 polarity be it is upper just under it is negative when, N1 voltage first passes through the afterflow of double half-bridge circuits
Diode VT1 rectification, then by Ce filter capacitor, Le filter inductance exports the direct current contact net voltage of half, N2 voltage
Freewheeling diode VT1, VT2, VT3 rectification of double half-bridge circuits are first passed through, then passes through Cf filter capacitor, Lf filter inductance, output
The direct current contact net voltage of half, N1, N2 output voltage merge into direct current contact net voltage, work as N1, N2 polarity be it is lower just
When upper negative, N1 voltage first passes through Ce filter capacitor, Le filter inductance, then by freewheeling diode VT2, VT3 of double half-bridge circuits,
VT4 rectification, exports the direct current contact net voltage of half, N2 voltage first passes through Cf filter capacitor, Lf filter inductance, then passes through
The freewheeling diode VT4 of double half-bridge circuits is rectified, and exports the direct current contact net voltage of half, N1, and N2 output voltage merges
Direct current contact net voltage is merged into for output voltage, electric energy is fed back to DC voltage contact net by final realize.
As shown in figure 3, what high-pressure side selected to low-pressure side main circuit topology is double half-bridge series winding type inverter circuit, the circuit
It is that identical by structure and symmetrical two half-bridge circuits are serially connected and constitute.Low-pressure side is selected to high-pressure side main circuit topology
Be full-bridge circuit.
When converter work in decompression mode: 1500V DC voltage enter main circuit to first pass through filtering and it is anti-reverse
Protection.L1 is direct current reactor, the device be mainly used for improve capacitor filtering caused by input current abnormality, improve power because
Number reduces and prevents dash current from rectifier bridge being caused to damage the problems such as overheating with capacitor.C1~C4 is that four models are identical straight
Bus electrolytic capacitor is flowed, each value is 2200 μ F/450VDC, uses series connection to provide enough pressure voltages, dc-link capacitance
Main function be absorb ripple current, make system output it is more stable.R1~R4 is be connected in parallel on this four capacitor both ends equal
Piezoresistance, each value is 150k Ω, and the presence of these resistance ensure that the partial pressure of capacitor is uniform, and certain capacitors is avoided to bear voltage
It is excessive, danger is brought to inverter；Also, when system-down, which, which may also function as, makes the electric energy on filter capacitor complete
The effect of release.Resistance-capacitance protection can only protect excessively high voltage build-up rate, as inhibited the peak voltage wave in power grid.Work as peaked wave
When coming, because the voltage on capacitor cannot be mutated, the voltage of peaked wave can be applied directly on the resistance being connected in series to the capacitor, and and capacitor
Concatenated resistance value is smaller (only tens ohm), and the energy of peaked wave is consumed on resistance, to reduce immediately peaked wave
Voltage amplitude.When operating normally, the capacitive reactance of capacitor is much larger than resistance (difference hundred times), and the electric current of the road of capacitance-resistance is very
It is small, so ohmically power consumption very little.
Bridge arm capacitor Ca, Cb, resonant inductance Le, resonant capacitance Ce, transformer primary winding N1, switching tube Q1, Q2 and
VT1, VT2 constitute half-bridge circuit.Wherein Q1, VT1 form an IGBT unit, and Q2, VT2 form another IGBT unit,
The two units, which are packaged together, constitutes the IGBT module of Unit two.Likewise, lower half-bridge circuit has identical knot
Structure.A noninductive capacitor in parallel is needed on every group of IGBT.Its effect is the voltage point on the i.e. positive and negative copper bar of absorbing circuit plate busbar
Peak cuts down high-frequency impulse energy, prevents the property difference due to two switching tubes and magnetic core of transformer is caused to be saturated, to improve
The anti-unbalance voltage capability of half-bridge inversion circuit protects high power tube.Except requiring, inductance is small as far as possible (can not to be Absorption Capacitance
0) it is strong, to additionally need overcurrent capability, general dv/dt value is very big when IGBT is turned off, and the reversed spike of generation is very steep, reaches per micro-
Second several hectovolts, it is desirable that capacitor can quickly absorb, and therefore, select the very small noninductive capacitor of inductance.
There are two coils for the primary side of high frequency transformer, are inputted respectively by upper and lower two half-bridges, secondary side is then by a line
Circle output.Transformer utilization factor not only can be improved in the structure of this transformer, also has anti-unbalance ability.By circuit structure
It is found that only two pipe conductings in switching tube Q1, Q2, Q3, Q4 same time, if 4 capacitor Ca, Cb, Cc, Cd values are all
It is equal, just have the half that the maximum withstanding voltage on switching tube is supply voltage, i.e. V1/2.In this way, just passing through double half-bridge strings
The maximum pressure voltage that connection type inverter structure reduces each switching tube also ensures vehicle power supply so that cost substantially reduces
Reliability.
It is directed to half-bridge circuit, when Q1 is connected, and Q2 ends, Ca both end voltage can be added to high frequency transformer N1 by Q1
The both ends of winding.At this point, transformer N1 winding both end voltage and Ca both end voltage are equal, polarity is lower just upper negative.When Q1 is cut
Only, when Q2 is connected, the voltage at the both ends Cb is added to the both ends of transformer N1 winding by Q2, so that the N1 both end voltage pole reversal,
It is just lower negative on i.e..Working state analysis for lower half-bridge circuit, Q3, Q4 is and Q1, Q2 are similar.It can thus become in high frequency
The primary side of depressor generates the positive and negative square-wave voltage that an amplitude is 750V, while the voltage can be generated by series resonance close to just
The electric current of string wave.The square-wave voltage passes through high frequency transformer, by Cg filter capacitor, Lg filter inductance, then passes through full-bridge circuit
Freewheeling diode rectification processing after, export DC voltage.C5 is filtering capacitance of voltage regulation, absorbs ripple current, keeps system defeated
The direct current 60V voltage of straight pulse free out, and be to vehicle power supply composite energy storage system, load, low-voltage control circuit and illumination
System power supply.
When converter work is in boost mode: for the low-pressure side of high frequency transformer, working as Q5, Q8 conducting, Q6, Q7 cut-off
When, the 60V DC voltage that vehicle power supply composite energy storage system provides can be by Q5, Q8, and using Cg, Lg series resonance is added to height
The both ends of frequency power transformer N3, polarity are upper just lower negative.Work as Q6, Q7 conducting, when Q5, Q8 end, 60V DC voltage can by Q6,
Q7, using Cg, Lg series resonance is added to the both ends of high frequency transformer N3, and polarity is lower just upper negative.It can thus become in high frequency
The secondary side of depressor generates the positive and negative square-wave voltage that an amplitude is 60V.The square-wave voltage passes through high frequency transformer, works as N1, the pole N2
Property for it is upper just under it is negative when, N1 voltage first passes through the freewheeling diode VT1 rectification of double half-bridge circuits, then passes through Ce filter capacitor, Le
Filter inductance exports 750V DC voltage.N2 voltage first passes through freewheeling diode VT1, VT2, VT3 rectification of double half-bridge circuits,
Again by Cf filter capacitor, Lf filter inductance exports 750V DC voltage, N1, and N2 output voltage merges into 1500V direct current.When
When N1, N2 polarity are lower just upper negative, N1 voltage first passes through Ce filter capacitor, Le filter inductance, then passes through the continuous of double half-bridge circuits
Diode VT2, VT3, VT4 rectification are flowed, 750V DC voltage is exported.N2 voltage first passes through Cf filter capacitor, Lf filter inductance, then
It is rectified by the freewheeling diode VT4 of double half-bridge circuits, exports 750V DC voltage, N1, it is straight that N2 output voltage merges into 1500V
Stream.Electric energy is fed back to 1500V DC voltage contact net by final realize.
New type mining electric locomotive vehicle power supply bidirectional DC-DC converter control strategy, it is characterised in that the inversion of decompression
Process uses Bipolar control, and the reversals of boosting use phase shifting control.
The Bipolar control of converter decompression mode: when converter works in decompression mode, the contact of 1500V DC voltage
Isolating transformer is crossed to low-pressure side composite energy storage system power supply by Netcom.In the case of normal power supply, the equivalent main circuit of decompression mode
As shown in Figure 4.Work wave using double half-bridge inverters of Bipolar control mode is as shown in Figure 5.Switching tube Q1~Q4 is adopted
It is PWM control mode.In a switch periods TsFirst half cycle in, switching tube Q1 and Q3 conducting, turn-on time Ton；
Later half period switching tube Q2 and Q4 conducting, turn-on time is also Ton, can preferably prevent the magnetic saturation of isolating transformer existing in this way
As occurring.In switching tube Q1 and Q3 conducting, if disregarding the on-state voltage drop of switching tube, the voltage on primary winding
For Uab=750V, in switching tube Q2 and Q4 conducting, the voltage on armature winding is Uab=-750V；In switching tube Q1 and Q3
Voltage u when being turned off with Q2 and Q4, on armature windingab=0, regulating switch pipe is opened the turn-off time, that is, adjusts duty
Compare Du, so that it may adjust voltage uabPulse width, thus reach adjust uabThe purpose of virtual value size, it is final to realize voltage control
System.
If that isolating transformer secondary connects is resistive load RLd, then the waveform and voltage u of the electric current of load are flowed through0、uab
It is identical, amplitude i2mAre as follows: i2m=(ui/K)/RLd, wherein uiFor the input of 1500V direct current contact net, i2mIt is low for high frequency transformer
Side current amplitude is pressed, K is high frequency transformer no-load voltage ratio, isolating transformer high voltage side current i1Waveform and low-pressure side electric current i2It is identical.
If isolating transformer is ideal transformer, the load resistance R in transformer secondary output is metLdWith do not use isolating transformer and
Directly in two terminating resistor R of A, BLdIt is the same effect.So the electric current for flowing through switching tube Q1 and Q3 is ui/RLd.In switching tube
When Q2 and Q4 is connected, the electric current for flowing through Q2 and Q4 is also ui/RLd, at this time the anti-parallel diodes VT1 of switching tube Q1~Q4~
There is no electric current to flow through in VT4.
The phase shifting control of converter boost mode: when converter works in boost mode, composite energy storage system by every
From transformer to 1500V DC voltage contact net feedback power.In the case of normal power supply, the equivalent main circuit of boost mode is as schemed
Shown in 6, it can regard as and be made of full bridge inverter and rectification circuit.
In equivalent circuit shown in fig. 6, converter low pressure inversion working side does not have energy storage inductor, therefore same bridge arm is upper and lower
Two switching tubes cannot simultaneously turn on, and the control signal of two switching tubes of same bridge arm must have dead zone.To meet above-mentioned want
It asks, phase-shifting control method can be taken, the size by controlling phase shifting angle realizes the control to voltage.
The phase shifting control of two-way isolated form DC/DC converter boost work refers to that switching tube Q5 and Q6 are connected in turn, respectively leads
Lead to 180 ° of electrical angles；Switching tube Q7 and Q8 are also connected in turn, and 180 ° of electrical angles are respectively connected.But switching tube Q5 and Q7 are not to lead simultaneously
It is logical.Q5 is first connected, and is connected after Q7, and the conducting of the two differs α electrical angle.As shown in Figure 7.Wherein, switching tube Q5 and Q6 is first respectively
It is connected in switching tube Q7 and Q8.When using phase shifting control, the pulsewidth of high frequency transformer low-pressure side floating voltage Uab only with phase shifting angle
α is related, and when α=0 °, Uab is the square wave that electric angle is 180 °.When α increases, the pulsewidth of Uab waveform narrows, so as to realize
Voltage control.It, can be by output voltage control in the range of requiring by the size of dynamic regulation phase shifting angle α.
The present invention designs high frequency transformer using AP method.In the selection of core material and structure, mainly there is perm conjunction
Gold, Ferrite Material, co-based amorphous alloy and ultramicro-crystal alloy different materials.Permalloy, cobalt base amorphous state price are high, about
For the several times of Ferrite Material, and saturation induction density is also not very high, and processing technology is complicated.Therefore, comprehensive several materials
The performance of material compares, and the present invention has selected Ferrite Material.In magnetic core basic structure, EE type is selected, such as table 1.
Selection work magnetic induction density B m can determine that work magnetic induction is strong according to formula Bm≤Bs/3 under normal circumstances
Degree, wherein Bs is saturation induction density.The present invention is when determining transformer parameter, it is contemplated that the ginseng of core material and circuit
Several and feature, and by reference to existing design, the final value for determining Bm is 0.16T.The determination of form factor Kf: current wave
The ratio between virtual value and average value of shape are known as the form factor Kf of the electric current.It is a determining value, defeated with high frequency transformer
Enter it is related, when input be sine wave when take 4.44, when input be square wave when take 4.Circuit topological structure according to the present invention, high frequency
The input of transformer is square wave, therefore selects Kf=4.The determination of window coefficient of utilization K0 generally takes K0=based on experience value
0.2~0.4, K0=0.4 is taken here.The determination of transformer capacity PT, according to different inverter forms and rectifier system, transformation
The calculation method of device capacity PT is different, consult table 2, and inverter form of the present invention is double half-bridge tandem type inversions
Device, rectifier system is diode bridge rectification, so the calculation method of PT are as follows:According to circuit topological structure
And its performance parameter is it is found that P2For electric mine locomotive vehicle power supply rated power, the U of transformer primary side voltage1For 750V,
Secondary side voltage U2For 60V, secondary current is=60A, the efficiency of transformer are η 90%, the working frequency f of switching devicesFor
20kHz, so that
The calculating of Ap, inspection information can obtain, and EE shaped iron core is when allowing 25 DEG C of temperature rise, Kj=366, X=-0.12, and
The parameters obtained as above arrived, can calculate the value of Ap.
Wherein, Kj is current density ratio coefficient, AwIt is magnetic core window area, AeIt is magnetic core effective sectional area, X is and magnetic
The related constant of core selects the model and specification of magnetic core, according to the A being calculatedPValue can choose model and the rule of magnetic core
Lattice, but should be noted that the A of the magnetic core finally chosen when choosingPValue is greater than calculated value, in finally determining APValue will add
Certain nargin gives APIn the case of value increases by 10% nargin, Ap* (1+10%)=73.92cm4.According to EE type ferrite magnetic core
Requirement, pass through table look-up 3 determine specifications be E110 type magnetic core, Ap=179.968cm4, Aw=14.06cm2, Ae=
12.8cm2.The calculating of current density, J: consult table 1, when allowing 25 DEG C of temperature rise, Kj=366, X=-0.12 are obtained EE shaped iron core
To J=Kj(AwAe)x=KjAp x=366*179.968-0.12=196.27A/cm2.Calculating first winding the number of turns, the one of transformer
Secondary winding voltage U1It is 750V, Kf=4, Bm=0.16T, fs=20KHz can be obtained, Ae=12.8cm by table 32, then first winding
The number of turns NpIt calculates as follows:Round numbers Np=46 circle.First winding electricity
The calculating of streamBy circuit topology it is found that the first winding of high frequency transformer is using two
The mode of winding parallel, therefore, the once winding current calculated here, the sum of the electric current of actually two windings, so
For each individual winding, winding current should be the half of Ip value, i.e. Ip1=Ip2=2.667A.Therefore have one
Secondary winding bare wire area Axp:Calculate secondary winding the number of turns Ns, output voltage U2=
60V, thereforeRound numbers Ns=4 circle.Secondary winding bare wire area Axs:The turn ratio of transformer is K:Round numbers k=12.
The various core structure constant tables of table 1
The calculating power of the various converters of table 2
3 EE type magnetic core specification table of table
Claims (4)
1. a kind of vehicle power supply bidirectional DC-DC converter characterized by comprising
It is direct current contact net voltage input, filter protective circuit, double half-bridge series inverters and rectification circuit, high frequency transformer, complete
Bridge inverter and diode rectifier circuit, filter circuit, low pressure energy storage device, high side voltage constant detection circuit, low-pressure side
Voltage constant detection circuit, low-pressure side current spike detection circuit, control module, drive module, PWM generator, accessory power supply；
Direct current contact net voltage input is connected with filter protective circuit, filter protective circuit and double half-bridge series inverters and whole
Current circuit is connected, and double half-bridge series inverters and rectification circuit are connected with PWM generator and high frequency transformer respectively, high frequency
Transformer is connected with full-bridge inverter and diode rectifier circuit, full-bridge inverter and diode rectifier circuit and filter circuit
Be connected, filter circuit is connected with low pressure energy storage device, low pressure energy storage device respectively with low-pressure side voltage constant detection circuit
It is connected with low-pressure side current spike detection circuit, PWM generator is connected with drive module, drive module and control module phase
Connection, control module respectively with low-pressure side voltage constant detection circuit, high side voltage constant detection circuit and low-pressure side electric current
Spike detection circuit is connected；Accessory power supply is connected with control module；
Direct current contact net voltage input provides high-voltage dc voltage input；
Filter protective circuit includes filter circuit and rc protection circuit, and filter circuit uses direct current reactor L1, for absorbing
Input power ripple current；Rc protection circuit, including C1, C2, C3, C4 and R1, R2, R3, R4；Rc protection circuit ensure that
The partial pressure of capacitor is uniform, and C1, C2, C3, C4 are the identical DC bus electrolytic capacitors of four models, and R1, R2, R3, R4 are in parallel
Equalizing resistance at this four capacitor both ends ensure that the partial pressure of capacitor is uniform, and when system-down, which, which may also function as, is allowed
The effect that electric energy on filter capacitor discharges completely；
Double half-bridge series inverters and rectification circuit are rectified using double half-bridge tandem type structure inversions and freewheeling diode, will be high
Pressure DC inverter is high-frequency alternating current；Bridge arm capacitor Ca, Cb, resonant inductance Le, resonant capacitance Ce, transformer primary winding
N1, switching tube Q1, Q2 and VT1, VT2 constitute half-bridge circuit；Wherein Q1, VT1 form an IGBT unit, Q2, VT2 composition
Another IGBT unit, the two units, which are packaged together, constitutes the IGBT module of Unit two, likewise, lower half-bridge is electric
There is an identical structure on road: bridge arm capacitor Cc, Cd, resonant inductance Lf, resonant capacitance Cf, transformer primary winding N2, switching tube
Q3, Q4 and VT3, VT4 constitute lower half-bridge circuit；Wherein Q3, VT3 form an IGBT unit, and Q4, VT4 form another
IGBT unit, the two units, which are packaged together, constitutes the IGBT module of Unit two；Resonant capacitance Ce and resonant inductance
Le is connected, and resonant inductance Le is connected with transformer primary winding N1；
High frequency transformer, when vehicle power supply bidirectional DC-DC converter is in decompression reversals, high frequency transformer hands over high pressure
Galvanic electricity becomes low-voltage AC；When vehicle power supply bidirectional DC-DC converter is in boosting reversals, high frequency transformer will be low
Pressure alternating current becomes High Level AC Voltage；
Full-bridge inverter and diode rectifier circuit are rectified using full bridge structure inversion and freewheeling diode, by low-voltage DC
Inversion is high-frequency alternating current, including Q5, Q6, VT5, VT6, Q7, Q8, VT7, VT8, Lg, Cg；Resonant inductance Lg and resonant capacitance Cg
It is connected, resonant capacitance Cg is connected with transformer primary winding N3, and switching tube Q5, Q6 and VT5, VT6 constitute a bridge arm；
Switching tube Q7, VT7 and Q8, VT8 form another bridge arm；
Filter circuit absorbs ripple current using C5 filtering capacitance of voltage regulation, keeps the output of vehicle power supply bidirectional DC-DC converter flat
The DC low-voltage of straight pulse free；
High side voltage constant detection circuit detects vehicle power supply bidirectional DC-DC converter high side voltage value, and will test
High tension voltage value feed back to control module；
Low-pressure side voltage constant detection circuit detects vehicle power supply bidirectional DC-DC converter low-pressure side voltage value, and will test
Low voltage value feed back to control module；
Low-pressure side current spike detection circuit detects vehicle power supply bidirectional DC-DC converter low-pressure side current spike value, and will inspection
The low-tension current kurtosis measured feeds back to control module；
Control module is to control PWM for analyzing voltage and current acquisition parameter using single-chip microcontroller as central processing unit
Device adjusts the turn-on time of IGBT, and then adjusts output voltage precision；
Drive module provides driving for IGBT；
PWM generator is controlled by control module, adjusts the turn-on time of IGBT；
Accessory power supply is control module, drive module, high side voltage constant detection circuit, low-pressure side voltage constant detection electricity
Road and the power supply of low-pressure side current spike detection circuit,
Low pressure energy storage device provides constant low pressure source for vehicle power supply bidirectional DC-DC converter, and inputs contact power grid in direct current
When cannot work, power supply is worked normally for electric locomotive.
2. a kind of vehicle power supply bidirectional DC-DC converter according to claim 1, which is characterized in that on every group of IGBT
A noninductive capacitor in parallel, i.e. Ca, Cb, Cc, Cd are needed, effect is the voltage point on the i.e. positive and negative copper bar of absorbing circuit plate busbar
Peak cuts down high-frequency impulse energy, prevents the property difference due to two switching tubes and magnetic core of transformer is caused to be saturated, to improve
The anti-unbalance voltage capability of half-bridge inversion circuit protects high power tube.
3. a kind of vehicle power supply bidirectional DC-DC converter according to claim 1, which is characterized in that double half-bridge series connection
Inverter and rectification circuit use Sofe Switch harmonic technology, including Le, Ce, Lf, Cf, Lg, Cg, play the work for delaying electric current to rise
With to realize Zero Current Switch conducting.
4. a kind of control method of vehicle power supply bidirectional DC-DC converter according to claim 1, which is characterized in that use
A kind of vehicle power supply bidirectional DC-DC converter is controlled, and the reversals including decompression use Bipolar control, boosting it is inverse
Change process uses phase shifting control:
The reversals of decompression use Bipolar control: when converter works in decompression mode, DC voltage contact net passes through
High frequency transformer is powered to low-pressure side composite energy storing device, in the case of normal power supply, using double half-bridges of Bipolar control mode
Inverter, switching tube Q1, Q2, Q3, Q4 are using PWM control mode, in the first half cycle of a switch periods Ts, switch
Pipe Q1 and Q3 conducting, turn-on time Ton；Later half period switching tube Q2 and Q4 conducting, turn-on time is also Ton, in switching tube Q1
When with Q3 conducting, if disregarding the on-state voltage drop of switching tube, the voltage on primary winding is uab, in switching tube Q2 and
When Q4 is connected, the voltage on armature winding is-uab；Electricity when switching tube Q1 and Q3 and Q2 and Q4 are turned off, on armature winding
Press uab=0, regulating switch pipe is opened the turn-off time, that is, adjusts duty ratio Du, so that it may adjust voltage uabPulse width,
U is adjusted to reachabThe purpose of virtual value size, it is final to realize voltage control,
The reversals of boosting use phase shifting control: for the low-pressure side of high frequency transformer, working as Q5, Q8 conducting, Q6, Q7 cut-off
When, the DC voltage that vehicle power supply composite energy storing device provides can be by Q5, Q8, and using Cg, Lg series resonance is added to high frequency
The both ends of transformer N3, polarity be it is upper just lower negative, work as Q6, Q7 conducting, when Q5, Q8 end, 60V DC voltage can be by Q6, Q7,
Using Cg, Lg series resonance is added to the both ends of high frequency transformer N3, and polarity, thus can be in high frequency transformer to be lower just upper negative
Secondary side to generate an amplitude be the positive and negative square-wave voltage of DC voltage amplitude that vehicle power supply composite energy storing device provides, the party
Wave voltage by high frequency transformer, work as N1, N2 polarity be it is upper just under it is negative when, N1 voltage first passes through two pole of afterflow of double half-bridge circuits
Pipe VT1 rectification, then by Ce filter capacitor, Le filter inductance exports the direct current contact net voltage of half, and N2 voltage first leads to
Freewheeling diode VT1, VT2, VT3 rectification of double half-bridge circuits are crossed, then by Cf filter capacitor, Lf filter inductance exports two points
One of direct current contact net voltage, N1, N2 output voltage merges into direct current contact net voltage, works as N1, and N2 polarity is lower just upper negative
When, N1 voltage first passes through Ce filter capacitor, Le filter inductance, then freewheeling diode VT2, VT3, VT4 by double half-bridge circuits
Rectification exports the direct current contact net voltage of half, and N2 voltage first passes through Cf filter capacitor, Lf filter inductance, then passes through double
The freewheeling diode VT4 of half-bridge circuit is rectified, and exports the direct current contact net voltage of half, N1, N2 output voltage is merged into
Output voltage merges into direct current contact net voltage, and electric energy is fed back to DC voltage contact net by final realize.
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| CN114337313B (en) * | 2021-11-12 | 2024-05-14 | 中车永济电机有限公司 | Integrated power supply and multichannel auxiliary transmission system |
| CN114114105A (en) * | 2021-11-24 | 2022-03-01 | 广东电网有限责任公司广州供电局 | Magnetic flux density measuring device in high-frequency transformer and high-frequency transformer |
| CN114114105B (en) * | 2021-11-24 | 2022-08-02 | 广东电网有限责任公司广州供电局 | Magnetic flux density measuring device in high-frequency transformer and high-frequency transformer |
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| CN109167518B (en) | 2020-07-28 |
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