CN208226868U - A kind of circuit of reversed excitation - Google Patents
A kind of circuit of reversed excitation Download PDFInfo
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- CN208226868U CN208226868U CN201820713145.XU CN201820713145U CN208226868U CN 208226868 U CN208226868 U CN 208226868U CN 201820713145 U CN201820713145 U CN 201820713145U CN 208226868 U CN208226868 U CN 208226868U
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Abstract
The utility model provides a kind of circuit of reversed excitation, the circuit of reversed excitation is electric car power conversion unit power supply, the electric car power conversion unit is connected between the first battery and the second battery, and the energy of first battery is provided to second battery, second battery is circuit of reversed excitation power supply, the circuit of reversed excitation includes flyback transformer and control unit, wherein: the flyback transformer includes primary side and the first secondary side, the input terminal of the primary side connects the positive input terminal of the second battery by the first transistor, described first secondary side connects the electric car power conversion unit；The first transistor is controlled by the positive input terminal voltage magnitude of the output end voltage on the described first secondary side and second battery, the operation of on or off is carried out, to control the conducting and disconnection between the positive output end and the input terminal of the primary side.
Description
Technical field
The utility model relates to electric vehicle engineering field, in particular to a kind of circuit of reversed excitation.
Background technique
Currently, automobile usually requires a set of A-battery power supply system as the power supply of vehicle low-voltage electronic equipment.Conventional fuel oil
Vehicle generally charges to A-battery with generator.As shown in Figure 1, then needing an electric car power for electric car
Converting means 102 is that A-battery 103 charges.Such as plug-in hybrid-power automobile, or for possessing 48V start stop system
Automobile, be through overpower topological circuit 102A by internal high pressure battery/48V battery 101 to A-battery 103 or low pressure electric power storage
It charges in pond.At the same time, such power conversion unit itself accessory power supply 102G is also powered by 103 end of A-battery.By
It is battery in the output end of power topological circuit 102A, there need to be counnter attack connection function, since output circuit current is larger, generally
Anti-reverse protection, the T100 as shown in Fig. 1 are carried out using MOSFET, power conversion unit further include signal sample circuit 102B,
Circuit 102C, driving circuit 102D, telecommunication circuit 102E, master controller 102F are protected, wherein accessory power supply 102G is adopted to signal
Sample circuit 102B, protection circuit 102C, driving circuit 102D, telecommunication circuit 102E, master controller 102F provide low-tension supply, and
The turn-on and turn-off of driving circuit 102D control T100.
As shown in Fig. 2, accessory power supply 102G include anti-reverse diode 201, it is absorbing circuit 202, filter capacitor 203, anti-
Violent change depressor 210 and control unit 220, the input terminal voltage Vin of flyback transformer 210 are control by power end diode 209
Unit 220 processed is powered, and control unit 220 controls the turn-on and turn-off of power switch tube 207, to control flyback transformer 210
Output power, sampling resistor 208 sample the input current of flyback transformer 210, and feed back to control unit 220, with
Detect output accuracy.For the power conversion unit 102 of foregoing description, accessory power supply 102G need to equally have anti-reverse protection
Function.In addition, the reliability Work in order to guarantee power conversion unit, accessory power supply 102G need to meet low-voltage starting and require.
Traditional design scheme generallys use the mode of Flyback topological (flyback transformer 210) plus anti-reverse diode 201, such as schemes
Shown in 2.The program affects the low-voltage starting ability of accessory power supply due to the presence of anti-reverse 201 conduction voltage drop of diode.
Meanwhile when the second cell voltage B+ is lower, anti-reverse diode 201 can generate biggish power loss.If emergent power becomes
The transient state loss of the case where changing device output end voltage Vo1, Vo2 or Vo3 fall suddenly, anti-reverse diode 201 can be very big, right
Requirement is improved in the type selecting of diode.
Utility model content
The purpose of this utility model is to provide a kind of circuit of reversed excitation, to solve existing electric car power conversion unit
Accessory power supply larger problem is lost.
In order to solve the above technical problems, the utility model provides a kind of circuit of reversed excitation, the circuit of reversed excitation is an electronic vapour
The power supply of vehicle power conversion unit, the electric car power conversion unit are connected between the first battery and the second battery, and will
The energy of first battery is provided to second battery, and second battery is circuit of reversed excitation power supply, the flyback
Circuit includes flyback transformer and control unit, in which:
The flyback transformer includes primary side and the first secondary side, and the input terminal of the primary side connects the by the first transistor
The positive input terminal of two batteries, the described first secondary side connect the electric car power conversion unit；
The first transistor is by the described first secondary output end voltage on side and the positive input terminal voltage of second battery
Amplitude control, carries out the operation of on or off, to control the conducting between the positive output end and the input terminal of the primary side
And disconnection.
Optionally, in the circuit of reversed excitation, the circuit of reversed excitation further includes first resistor, in which:
Described first resistor one end connects the positive input terminal, and the other end connects the input terminal on the described first secondary side.
Optionally, in the circuit of reversed excitation, the first transistor is n type field effect transistor, and described first is brilliant
The first electrode of body pipe connects the positive input terminal, and the second electrode of the first transistor connects the input terminal of the primary side.
Optionally, in the circuit of reversed excitation, the circuit of reversed excitation further includes voltage-stabiliser tube, second resistance and the one or two pole
Pipe, in which:
The anode of the voltage-stabiliser tube connects the positive input terminal, and the cathode of the voltage-stabiliser tube connects the first transistor
Grid；
Described second resistance one end connects the grid of the first transistor, and the other end connects the negative of the first diode
Pole；
The anode of the first diode connects the output end on the described first secondary side.
Optionally, in the circuit of reversed excitation, the flyback transformer further include second it is secondary while and when third pair,
In:
Described second it is secondary while and input end grounding when the third pair；
The output end on the described first secondary side connects the anode of the second diode, the cathode connection first of second diode
One end of capacitor；The other end of the first capacitor connects the input terminal on the described first secondary side；The cathode of second diode
It is also connected with the anode of the first diode；
The anode of the output end connection third diode on the described second secondary side, the cathode connection second of the third diode
One end of capacitor；The other end of second capacitor connects the input terminal on the described second secondary side；
The output end on third pair side connects the anode of the 4th diode, and the cathode of the 4th diode connects third
One end of capacitor；The other end of the third capacitor connects the input terminal on third pair side.
Optionally, in the circuit of reversed excitation, described control unit includes power switch tube, the 5th diode, the 6th
Diode, switching regulator controller and 3rd resistor, in which:
The first electrode of the power switch tube connects the output end of the primary side, the second electrode of the power switch tube
The sampling input terminal of the 3rd resistor and switching regulator controller, the 3rd resistor other end ground connection are connected, the power is opened
The grid for closing pipe connects the pulse-modulated signal output end of the switching regulator controller；
The anode of 5th diode connects the input terminal of the primary side, described in the cathode connection of the 5th diode
The power input of switching regulator controller；
6th diode anode connection the 4th diode cathode, the 6th diode cathode connection described in
The power input of switching regulator controller.
Optionally, in the circuit of reversed excitation, third pair side includes the 4th resistance and the 5th resistance, in which: institute
It states the 4th resistance and the 5th resistance is connected between the cathode and ground of the 4th diode, the switching regulator controller
Feedback input end connects the junction of the 4th resistance and the 5th resistance.
Optionally, in the circuit of reversed excitation, the circuit of reversed excitation further includes absorbing circuit, and the absorbing circuit includes
6th resistance, the 4th capacitor and the 7th diode, in which:
Described 6th resistance one end connects the input terminal of the primary side, and the other end connects the cathode of the 7th diode；
Described 4th capacitor one end connects the input terminal of the primary side, and the other end connects the cathode of the 7th diode；
The anode of 7th diode connects the first electrode of the power switch tube.
Optionally, in the circuit of reversed excitation, the circuit of reversed excitation further includes the 5th capacitor, and the one of the 5th capacitor
End connects the input terminal of the primary side, other end ground connection.
Optionally, in the circuit of reversed excitation, the electric car power conversion unit includes a power topological circuit,
The circuit of reversed excitation is power topological circuit power supply.
Optionally, in the circuit of reversed excitation, the energy of first battery is provided to by the power topological circuit
Second battery is connected with second transistor between the power topological circuit and second battery.
Optionally, in the circuit of reversed excitation, the electric car power conversion unit further include signal sample circuit,
Protect circuit, telecommunication circuit, driving circuit and master controller, in which:
The circuit of reversed excitation is to the signal sample circuit, the protection circuit, the telecommunication circuit, the driving circuit
Low-tension supply is provided with the master controller；
The driving circuit provides multiple control signal to the power topological circuit, to control the power topological circuit
Output power, and the driving circuit controls the turn-on and turn-off of the second transistor.
In circuit of reversed excitation provided by the utility model, by the first transistor by the output end voltage on the first secondary side and institute
The positive input terminal voltage magnitude control for stating the second battery, carries out the operation of on or off, to control positive output end and primary side
Conducting and disconnection between input terminal, reduce conduction voltage drop, substitute simple anti-reverse diode using field effect transistor,
Solve the increase of input current when cell voltage is lower so that caused by the conduction voltage drop of anti-reverse diode loss compared with
Big problem.
Specifically, compared with traditional flyback transformer formula power source design, the anti-transient current energy of the anti-reverse diode of tradition
Power is limited, and the MOSFET alternative solution of the utility model, and since its conduction voltage drop is almost nil, anti-transient current ability is more
By force, it solves the problems, such as that counnter attack diode losses are excessive or even damage, improves circuit of reversed excitation reliability.
In addition, when working normally, input MOSFET constantly on, almost nil conduction voltage drop, so that this is practical new
The circuit of reversed excitation of type is more efficient compared to the anti-reverse diode design of tradition.
Further, the control unit dual power supply scheme that the utility model introduces, so that circuit of reversed excitation driving is more steady
It is fixed, driving voltage drop problem caused by input voltage drop under traditional scheme is avoided, the anti-input electricity of circuit of reversed excitation is improved
Press the ability of (cell voltage) fluctuation.
Further, the circuit of reversed excitation circuit where the flyback transformer is consistent with traditional circuit of reversed excitation, utilizes RCD
The absorbing circuit of structure absorbs transformer leakage inductance energy, reduces the VDS due to voltage spikes of power switch tube.Entire circuit is using secondary
The control of polygonal voltage feedback closed loop, while primary current sampling is added, realize overcurrent protection function.
Detailed description of the invention
Fig. 1~2 are existing electric car power conversion unit schematic diagrames；
Fig. 3~4 are the electric car power conversion unit schematic diagrames in an embodiment of the present invention；
It is as shown in the figure:
The prior art: 101- high-tension battery/48V battery；102- electric car power conversion unit；102A- power topology
Circuit；102B- signal sample circuit；102C- protects circuit；102D- driving circuit；102E- telecommunication circuit；102F- main control
Device；102G- circuit of reversed excitation；103- A-battery；104- low-voltage load；The anti-reverse diode of 201-；202- absorbing circuit；
203- filter capacitor；207- power switch tube；208- sampling resistor；209- power end diode；210- flyback transformer；
220- control unit；
The utility model: the first battery of 301-；302- electric car power conversion unit；302A- power topological circuit；
302B- circuit of reversed excitation；302C- driving circuit；The second battery of 303-；304- low-voltage load；410- flyback transformer；420- control
Unit processed；421- switching regulator controller.
Specific embodiment
Below in conjunction with the drawings and specific embodiments to the utility model proposes circuit of reversed excitation be described in further detail.Root
According to following explanation and claims, will be become apparent from feature the advantages of the utility model.It should be noted that attached drawing be all made of it is non-
Often simplified form and use non-accurate ratio, only to it is convenient, lucidly aid in illustrating the utility model embodiment
Purpose.
The core concept of the utility model is to provide a kind of circuit of reversed excitation, to solve existing electric car power conversion
Larger problem is lost in accessory power supply in device.
To realize above-mentioned thought, the utility model provides a kind of circuit of reversed excitation, and the circuit of reversed excitation is an electric car
The power supply of power conversion unit internal circuit, the electric car power conversion unit be connected to the first battery and the second battery it
Between, and the energy of first battery is provided to second battery, second battery is circuit of reversed excitation power supply, institute
Stating circuit of reversed excitation includes flyback transformer and control unit, in which: the flyback transformer includes primary side and the first secondary side, described
The input terminal of primary side connects the positive input terminal of the second battery by the first transistor, and the described first secondary side connects the electric car
Power conversion unit；The first transistor is by the described first secondary output end voltage on side and the positive input terminal of second battery
Voltage magnitude control, carries out the operation of on or off, to control between the positive output end and the input terminal of the primary side
Conducting and disconnection.
The present embodiment provides a kind of circuit of reversed excitation, and as shown in figs. 34, the electric car power conversion unit 302 connects
Second battery is provided between the first battery 301 and the second battery 303, and by the energy of first battery 301
303；First battery 301 is high-tension battery/48V battery, and the second battery 303 is A-battery or low tension battery, the second battery
303 power for low-voltage load 304.
The electric car power conversion unit 302 includes an a circuit of reversed excitation 302B and power topological circuit 302A；Institute
The second battery 303 is stated as circuit of reversed excitation 302B power supply；The circuit of reversed excitation 302B is power topological circuit 302A confession
Electricity；The electric car power conversion unit 302 further includes one drive circuit 302C, and the driving circuit exports multiple control letters
Number, to control power switch tube or the turn-on and turn-off of array in power topological circuit, and according to the duty ratio control of conducting shutdown
Output power processed.Since the output end of power topological circuit 302A is A-battery or low tension battery, there need to be anti-reverse function
Can, since output circuit current is larger, anti-reverse protection, second transistor as shown in Figure 3 are generally carried out using MOSFET
T100, power conversion unit 302 further include signal sample circuit, protection circuit, telecommunication circuit, master controller etc., wherein flyback
Circuit 302B provides low-tension supply, and drives to signal sample circuit, protection circuit, driving circuit, telecommunication circuit, master controller
The turn-on and turn-off of circuit 302C control second transistor T100.
As shown in figure 4, the circuit of reversed excitation 302B includes flyback transformer 410 and control unit 420；The flyback transformation
Device 410 includes primary side and the first secondary side, and the input terminal of the primary side passes through the just defeated of the second battery of the first transistor M1 connection 303
Enter end, the described first secondary side connects the power topological circuit 302A；The first transistor M1 is defeated by the described first secondary side
The control of the positive input terminal voltage B+ amplitude of outlet voltage Vo1 and second battery, carries out the operation of on or off, with control
Conducting and disconnection between the positive output end B+ and the input terminal of the primary side.By the first transistor by the defeated of the first secondary side
The control of the positive input terminal voltage magnitude of outlet voltage and second battery, carries out the operation of on or off, just defeated to control
Conducting and disconnection between outlet and the input terminal of primary side, reduce conduction voltage drop, are substituted using field effect transistor simple
Anti-reverse diode solves the increase of input current when cell voltage is lower, so that the conduction voltage drop of anti-reverse diode
Caused by larger problem is lost.
Specifically, the circuit of reversed excitation 302B further includes first resistor R1, in which: described in the circuit of reversed excitation
The one end first resistor R1 connects the positive input terminal B+, and the other end connects the input terminal LS on the described first secondary side.The present embodiment with
Traditional flyback transformer formula power source design is compared, and the anti-transient current ability of the anti-reverse diode of tradition is limited, and this is practical new
The MOSFET alternative solution of type, since its conduction voltage drop is almost nil, anti-transient current ability is stronger, solves two pole of counnter attack
The problem of pipe loss is excessive or even damages, improves circuit of reversed excitation 302B reliability.
Further, in the circuit of reversed excitation, the first transistor M1 is n type field effect transistor, described the
The first electrode of one transistor M1 connects the positive input terminal B+, and the second electrode of the first transistor M1 connects the primary side
Input terminal.The circuit of reversed excitation 302B further includes voltage-stabiliser tube Dz, second resistance R2 and first diode D1, in which: described steady
The anode of pressure pipe Dz connects the positive input terminal B+, and the cathode of the voltage-stabiliser tube Dz connects the grid of the first transistor M1；
The one end the second resistance R1 connects the grid of the first transistor M1, and the other end connects the negative of the first diode D1
Pole；The anode of the first diode D1 connects the output end vo 1 on the described first secondary side.
Further, in the circuit of reversed excitation, the flyback transformer 410 further includes the second secondary side and third pair
Side, in which: described second it is secondary while and input end grounding when the third pair；The output end connection the two or two on the described first secondary side
The anode of pole pipe D2, one end of the cathode connection first capacitor C1 of the second diode D2；The first capacitor C1's is another
The input terminal on the secondary side of end connection described first；The cathode of the second diode D2 is being also connected with the first diode D1 just
Pole；The anode of the output end connection third diode D3 on the described second secondary side, the cathode connection second of the third diode D3
One end of capacitor C2；The other end of the second capacitor C2 connects the input terminal on the described second secondary side；Third pair side it is defeated
Outlet connects the anode of the 4th diode D4, one end of the cathode connection third capacitor C3 of the 4th diode D4；Described
The other end of three capacitor C3 connects the input terminal on third pair side.
As shown in figure 4, described control unit 420 includes power switch tube M2, the five or two pole in the circuit of reversed excitation
Pipe D5, the 6th diode D6, switching regulator controller 421 and 3rd resistor R3, in which: the first electricity of the power switch tube M2
Pole connects the output end of the primary side, and the second electrode of the power switch tube M2 connects the 3rd resistor R3 and switch control
The sampling input terminal Isns of device 421 processed, the 3rd resistor R3 other end ground connection, 3rd resistor R3 is sampling resistor, to flyback
The input current of transformer 410 is sampled, and feeds back to control unit 420；The grid of the power switch tube M2 connects institute
State the pulse-modulated signal output end PWM of switching regulator controller 421；Switching regulator controller 421 controls leading for power switch tube M2
Logical and shutdown, to control the output power of flyback transformer 410.
The anode of the 5th diode D5 connects the input terminal Vin of the primary side, the cathode of the 5th diode D5
Connect the power input VDD of the switching regulator controller 421；The primary side input terminal voltage Vin of flyback transformer 410 passes through
5th diode M5 is the power supply of switching regulator controller 421, and the 4th diode D4's of anode connection of the 6th diode D6 is negative
The cathode of pole, the 6th diode D6 connects the power input VDD of the switching regulator controller 421, flyback transformer
410 third pair side output end voltage Vo3 is the power supply of switching regulator controller 421 by the 6th diode D6.The present embodiment introduces
Control unit dual power supply scheme so that circuit of reversed excitation 302B driving it is more stable, avoid input voltage under traditional scheme
The drop problem of driving voltage caused by dropping, improves the ability of the anti-input voltage of circuit of reversed excitation 302B (cell voltage) fluctuation.
In addition, third pair side includes the 4th resistance R4 and the 5th resistance R5 in the circuit of reversed excitation, in which:
The 4th resistance R4 and the 5th resistance R5 are connected between the cathode and ground of the 4th diode D4, the switching tube
The feedback input end FB of controller 421 connects the junction of the 4th resistance R4 and the 5th resistance R5.FB is switching tube
The Voltage Feedback pin of controller 421 is used for output voltage closed-loop control.
Further, in the circuit of reversed excitation, the circuit of reversed excitation 302B further includes absorbing circuit, the absorption electricity
Road includes the 6th resistance R6, the 4th capacitor C4 and the 7th diode D7, in which: described 6th one end resistance R6 connects the primary side
Input terminal, the other end connects the cathode of the 7th diode D7；The one end the 4th capacitor C4 connects the defeated of the primary side
Enter end, the other end connects the cathode of the 7th diode D7；The anode of the 7th diode D7 connects the power switch
The first electrode of pipe M2.Absorbing circuit absorbs 410 leakage inductance energy of flyback transformer using RCD structure, reduces power switch tube M2
VDS due to voltage spikes.The circuit of reversed excitation 302B further includes the 5th capacitor C5, and one end of the 5th capacitor C5 connects the original
The input terminal on side, other end ground connection.
Specifically, in the circuit of reversed excitation, the power topological circuit 302A is by the energy of first battery 301
It is provided to second battery 303, is connected with the second crystal between the power topological circuit 302A and second battery 303
Pipe T100.
In circuit of reversed excitation provided by the utility model, by the first transistor by the output end voltage on the first secondary side and institute
The positive input terminal voltage magnitude control for stating the second battery, carries out the operation of on or off, to control positive output end and primary side
Conducting and disconnection between input terminal, reduce conduction voltage drop, substitute simple anti-reverse diode using field effect transistor,
Solve the increase of input current when cell voltage is lower so that caused by the conduction voltage drop of anti-reverse diode loss compared with
Big problem.
Specifically, compared with traditional flyback transformer formula power source design, the anti-transient current energy of the anti-reverse diode of tradition
Power is limited, and the MOSFET alternative solution of the utility model, and since its conduction voltage drop is almost nil, anti-transient current ability is more
By force, it solves the problems, such as that counnter attack diode losses are excessive or even damage, improves circuit of reversed excitation 302B reliability.
Further, the control unit dual power supply scheme that the utility model introduces, so that circuit of reversed excitation 302B drives
It is more stable, driving voltage drop problem caused by input voltage drop under traditional scheme is avoided, circuit of reversed excitation 302B is improved
The ability of anti-input voltage (cell voltage) fluctuation.
In addition, when working normally, input MOSFET constantly on, almost nil conduction voltage drop, so that this is practical new
The circuit of reversed excitation 302B of type is more efficient compared to the anti-reverse diode design of tradition.
The utility model proposes a kind of flyback power supply circuits, by replacing counnter attack diode with MOSFET, and lead to
The branch Vo1 that using in circuit of reversed excitation itself output LS suspends is crossed, the shutdown of opening of input MOSFET is controlled.The party
Case specifically includes that input MOSFET, counnter attack diode, input capacitance, RCD absorbing circuit, flyback transformer, circuit of reversed excitation power
Switching tube, primary current sampling resistor, control IC input power diode, it is secondary in output diode, it is secondary while output filter capacitor,
Control IC, input MOSFET driving circuit.The RCD absorbing circuit is by counterattack transformer leakage inductance and input and output voltage, anti-
Excitation circuit power decision.Input MOSFET driving circuit includes: gate pole zener diode, driving current-limiting resistance, counnter attack diode
And current-limiting resistance.Wherein, gate pole zener diode and driving current-limiting resistance are determined by MOSFET model.Current-limiting resistance have B+ with
The pressure difference of LS determines.
Wherein, the flyback sourse circuit is consistent with traditional circuit of reversed excitation, absorbs transformer leakage inductance energy using RCD circuit and subtracts
The VDS due to voltage spikes of few MOSFET.Entire circuit is controlled using secondary voltage feedback closed loop, while primary current sampling is added,
Realize overcurrent protection function.
By using dual power supply to control IC, guarantee when input voltage (i.e. cell voltage) is lower, control IC drives
Dynamic signal output level is stablized.Driving voltage decline caused by being lower because of input voltage (i.e. cell voltage) is avoided to make flyback
Circuit works in abnormality.
The anti-reverse diode of tradition is replaced by using input MOSFET (301), circuit of reversed excitation is improved and resists big moment electricity
Stream ability.Especially when input voltage is got higher, lost suddenly as power inverter output end loads.
After input MOSFET (301) is added, due to its low conduction voltage drop, the loss of the anti-reverse diode of tradition is eliminated,
So that circuit of reversed excitation efficiency significantly improves.Especially when input voltage is lower or the biggish occasion of circuit of reversed excitation power.
In order to guarantee to input normally opening and the anti-reverse requirement of battery for MOSFET (301), a kind of new drive is devised
Dynamic scheme.Driving signal is used as using secondary side suspension ground leg (Vo1).And anti-reverse diode (323) are added, avoid battery
Circuit damages when reversal connection.Further, since the potential difference of LS and B+ and non-constant, addition current-limiting resistance (320), so that input
The driving circuit of MOSFET is not influenced by the working condition of power inverter main power circuit.Keep circuit of reversed excitation circuit more efficient
Reliably.
Input terminal uses the scheme of MOSFET in the utility model, improves circuit of reversed excitation and resists big immediate current ability.Especially
It is to lose suddenly when input voltage is got higher as power inverter output end loads.After input MOSFET is added, since its is low
Conduction voltage drop eliminates the loss of the anti-reverse diode of tradition, so that circuit of reversed excitation efficiency significantly improves.Especially in input electricity
When pressing lower or the biggish occasion of circuit of reversed excitation power.
Using control IC dual power supply in the utility model, guarantee when input voltage (i.e. cell voltage) is lower, controls
IC driving signal stabilizing output level processed.Driving voltage caused by solving the problems, such as because of battery voltage ripple declines.
In order to guarantee to input normally opening and the anti-reverse requirement of battery for MOSFET, a kind of new driving side is devised
Case.Driving signal is used as using secondary side suspension ground leg (Vo1).And anti-reverse diode is added, electricity when avoiding battery reversal connection
Path loss is bad.Further, since the potential difference of LS and B+ and non-constant, addition current-limiting resistance, so that the driving circuit of input MOSFET
It is not influenced by the working condition of power inverter main power circuit, makes circuit of reversed excitation circuit more high efficient and reliable.
To sum up, the various configuration of circuit of reversed excitation is described in detail in above-described embodiment, and certainly, the utility model includes
But be not limited in above-mentioned implementation cited configuration, it is any converted on the basis of configuration provided by the above embodiment in
Hold, belongs to the range that the utility model is protected.It is anti-that those skilled in the art can lift one according to the content of above-described embodiment
Three.
Foregoing description is only the description to the utility model preferred embodiment, not to any limit of the scope of the utility model
Fixed, any change, the modification that the those of ordinary skill in the utility model field does according to the disclosure above content belong to right and want
Seek the protection scope of book.
Claims (12)
1. a kind of circuit of reversed excitation, the circuit of reversed excitation is electric car power conversion unit power supply, the electric car power
Converting means is connected between the first battery and the second battery, and the energy of first battery is provided to second electricity
Pond, second battery are circuit of reversed excitation power supply, which is characterized in that the circuit of reversed excitation includes flyback transformer and control
Unit, in which:
The flyback transformer includes primary side and the first secondary side, and the input terminal of the primary side passes through the second electricity of the first transistor connection
The positive input terminal in pond, the described first secondary side connect the electric car power conversion unit；
The first transistor is by the described first secondary output end voltage on side and the positive input terminal voltage magnitude of second battery
Control, carries out the operation of on or off, leads on and off between the positive output end and the input terminal of the primary side to control
It opens.
2. circuit of reversed excitation as described in claim 1, which is characterized in that the circuit of reversed excitation further includes first resistor, in which:
Described first resistor one end connects the positive input terminal, and the other end connects the input terminal on the described first secondary side.
3. circuit of reversed excitation as described in claim 1, which is characterized in that the first transistor is n type field effect transistor, institute
The first electrode for stating the first transistor connects the positive input terminal, and the second electrode of the first transistor connects the primary side
Input terminal.
4. circuit of reversed excitation as claimed in claim 3, which is characterized in that the circuit of reversed excitation further includes voltage-stabiliser tube, second resistance
And first diode, in which:
The anode of the voltage-stabiliser tube connects the positive input terminal, and the cathode of the voltage-stabiliser tube connects the grid of the first transistor
Pole；
Described second resistance one end connects the grid of the first transistor, and the other end connects the cathode of the first diode；
The anode of the first diode connects the output end on the described first secondary side.
5. circuit of reversed excitation as claimed in claim 4, which is characterized in that the flyback transformer further includes the second secondary side and third
Secondary side, in which:
Described second it is secondary while and input end grounding when the third pair；
The output end on the described first secondary side connects the anode of the second diode, and the cathode of second diode connects first capacitor
One end；The other end of the first capacitor connects the input terminal on the described first secondary side；The cathode of second diode also connects
Connect the anode of the first diode；
The anode of the output end connection third diode on the described second secondary side, the cathode of the third diode connect the second capacitor
One end；The other end of second capacitor connects the input terminal on the described second secondary side；
The output end on third pair side connects the anode of the 4th diode, and the cathode of the 4th diode connects third capacitor
One end；The other end of the third capacitor connects the input terminal on third pair side.
6. circuit of reversed excitation as claimed in claim 5, which is characterized in that described control unit includes power switch tube, the five or two
Pole pipe, the 6th diode, switching regulator controller and 3rd resistor, in which:
The first electrode of the power switch tube connects the output end of the primary side, the second electrode connection of the power switch tube
The sampling input terminal of the 3rd resistor and switching regulator controller, the 3rd resistor other end ground connection, the power switch tube
Grid connect the pulse-modulated signal output end of the switching regulator controller；
The anode of 5th diode connects the input terminal of the primary side, and the cathode of the 5th diode connects the switch
The power input of tube controller；
The cathode of anode the 4th diode of connection of 6th diode, the cathode of the 6th diode connect the switch
The power input of tube controller.
7. circuit of reversed excitation as claimed in claim 6, which is characterized in that third pair side includes the 4th resistance and the 5th electricity
Resistance, in which: the 4th resistance and the 5th resistance are connected between the cathode and ground of the 4th diode, the switch
The feedback input end of tube controller connects the junction of the 4th resistance and the 5th resistance.
8. circuit of reversed excitation as claimed in claim 6, which is characterized in that the circuit of reversed excitation further includes absorbing circuit, the suction
Receiving circuit includes the 6th resistance, the 4th capacitor and the 7th diode, in which:
Described 6th resistance one end connects the input terminal of the primary side, and the other end connects the cathode of the 7th diode；
Described 4th capacitor one end connects the input terminal of the primary side, and the other end connects the cathode of the 7th diode；
The anode of 7th diode connects the first electrode of the power switch tube.
9. circuit of reversed excitation as described in claim 1, which is characterized in that the circuit of reversed excitation further includes the 5th capacitor, and described
One end of five capacitors connects the input terminal of the primary side, other end ground connection.
10. circuit of reversed excitation as described in claim 1, which is characterized in that the electric car power conversion unit includes a function
Rate topological circuit, the circuit of reversed excitation are power topological circuit power supply.
11. circuit of reversed excitation as claimed in claim 10, which is characterized in that the power topological circuit is by first battery
Energy is provided to second battery, is connected with second transistor between the power topological circuit and second battery.
12. circuit of reversed excitation as claimed in claim 11, which is characterized in that the electric car power conversion unit further includes letter
Number sample circuit, protection circuit, telecommunication circuit, driving circuit and master controller, in which:
The circuit of reversed excitation is to the signal sample circuit, the protection circuit, the telecommunication circuit, the driving circuit and institute
It states master controller and low-tension supply is provided；
The driving circuit provides multiple control signal to the power topological circuit, to control the defeated of the power topological circuit
Power out, and the driving circuit controls the turn-on and turn-off of the second transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820713145.XU CN208226868U (en) | 2018-05-14 | 2018-05-14 | A kind of circuit of reversed excitation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820713145.XU CN208226868U (en) | 2018-05-14 | 2018-05-14 | A kind of circuit of reversed excitation |
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| CN208226868U true CN208226868U (en) | 2018-12-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113890362A (en) * | 2020-07-04 | 2022-01-04 | 宁德时代新能源科技股份有限公司 | Auxiliary source control circuit, DC/DC converter, and whole vehicle control system and method |
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2018
- 2018-05-14 CN CN201820713145.XU patent/CN208226868U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113890362A (en) * | 2020-07-04 | 2022-01-04 | 宁德时代新能源科技股份有限公司 | Auxiliary source control circuit, DC/DC converter, and whole vehicle control system and method |
| CN113890362B (en) * | 2020-07-04 | 2024-03-26 | 宁德时代新能源科技股份有限公司 | Auxiliary source control circuit, DC/DC converter, whole vehicle control system and method |
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