CN108964432A - A kind of DCDC current control circuit of fuel cell car - Google Patents
A kind of DCDC current control circuit of fuel cell car Download PDFInfo
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- CN108964432A CN108964432A CN201810832400.7A CN201810832400A CN108964432A CN 108964432 A CN108964432 A CN 108964432A CN 201810832400 A CN201810832400 A CN 201810832400A CN 108964432 A CN108964432 A CN 108964432A
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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Abstract
The invention discloses a kind of DCDC current control circuits of fuel cell car, including voltage sample control unit, first current sample control unit, second current sample control unit, error amplifier and PWM generator, the output voltage of the voltage sample control unit acquisition fuel cell, the first current sample control unit and the second current sample control unit acquire the output electric current of fuel cell simultaneously, the voltage sample control unit, the output end of first current sample control unit and the second current sample control unit is connected to the input terminal of the error amplifier simultaneously, the output end of the error amplifier connects the input terminal of the PWM generator, the output end connection power of the PWM generator opens up benefit.The present invention adjusts output electric current jointly by the first loop and the second loop to achieve the purpose that stabling current, while also functioning to the effect flowed.
Description
Technical field
The present invention relates to automobile power source technical fields, more particularly to a kind of DCDC current control electricity of fuel cell car
Road.
Background technique
DCDC control plate common at present mainly has voltage mode pwm control circuit, peak-current mode PWM control electricity
The shortcomings that road, averagecurrent mode control PWM, hysteresis current mode control circuit etc., these control circuits, is: (1) voltage-mode
Its input voltage dynamic response of formula pwm control circuit is slower, and compensation network is complicated, and limited wide input range makes its control loop
It is more complicated；(2) for peak-current mode to noise-sensitive, antinoise is poor, the point of electric current caused by Reverse recovery when device is opened
Thorn, harmonic compensation transient state amplitude deficiency etc. cause to vibrate: closed loop amplifier bandwidth, gain etc. cooperate in (3) average-current mode
Parameter designing debugging is complicated；(4) hysteresis current mode needs to detect and control the electric current complete period.
Summary of the invention
The purpose of the present invention is overcoming shortcoming in the prior art, a kind of DCDC electric current of fuel cell car is provided
Control circuit, on the basis of mode PWM controlled circuit, the shortcomings that overcoming common mode PWM controlled circuit.
In order to solve the above technical problems, the present invention is solved by following technical proposals:
A kind of DCDC current control circuit of fuel cell car, including voltage sample control unit, the first current sample
Control unit, the second current sample control unit, error amplifier and PWM generator, the voltage sample control unit acquisition
The output voltage of fuel cell, the first current sample control unit and the second current sample control unit acquire fuel simultaneously
The output electric current of battery, the voltage sample control unit, the first current sample control unit and the control of the second current sample are single
The output end of member is connected to the input terminal of the error amplifier simultaneously, and the output end of the error amplifier connects the PWM
The output end connection power of the input terminal of generator, the PWM generator opens up benefit.
The voltage sample control unit include resistance R196, resistance R191, resistance R192, resistance R185, resistance R193,
Resistance R197, resistance R217, resistance R207, resistance R222, resistance R189, resistance R52, capacitor C106, capacitor C107, capacitor
C109；The first current sample control unit includes resistance R88, resistance R89, diode D34, capacitor C39, resistance R87, electricity
Hinder R86, amplifier U10, resistance R223, resistance R195, capacitor C110, resistance R198, resistance R199, resistance R194, resistance
R187, triode Q34；The second current sample control unit includes resistance R83, resistance R84, diode D6, capacitor C4, electricity
Hinder R88, resistance R81, amplifier U9, resistance R184, diode D36, diode D33, capacitor C11, resistance R211, resistance
R186, capacitor C116, resistance R190, resistance R47, capacitor C108, diode D28, diode D29；
The resistance R196, resistance R191, resistance R192, resistance R185, resistance R193, resistance R197 are serially connected, institute
State resistance R196, capacitor C106, capacitor C107, capacitor C109 one end and meanwhile be connected to voltage acquisition port, the capacitor
C106, capacitor C107, capacitor C109 the other end be connected to one end of resistance R185 and resistance R193, the resistance R197 simultaneously
The other end connects one end of capacitor C110, resistance R198, resistance R199, capacitor C108 and resistance R217, the resistance R88 simultaneously
And one end of resistance R89 is separately connected current sample port, the other end of resistance R88 connects cathode, the electricity of diode D34 simultaneously
Hold C39, one end of resistance R87 and an input terminal of amplifier U10, the other end ground connection of the resistance R87, the amplifier
The other end of another input terminal connection capacitor C39 of U10, the other end of the resistance R89 are connecting diode D34 just simultaneously
One end of pole and resistance R86, the other end of the resistance R86 connect simultaneously amplifier U10 output end and resistance R223 one
End, one end of the other end connection resistance R195 of the resistance R223, the other end of the resistance R195 connect resistance simultaneously
One end of R194, the base stage of triode Q34, resistance R198, capacitor C110 the other end, the collector of the triode Q34 connects
The other end of one end of connecting resistance R187, the resistance R187 and resistance R194 are grounded simultaneously；
One end of the resistance R83 and resistance R84 is separately connected current sample port, and the other end of resistance R83 connects simultaneously
One end of the cathode of diode D6, an input terminal of amplifier U9, capacitor C4 and resistance R88 is connect, the resistance R84's is another
It holds while connecting the one of the anode of diode D6, another input terminal of amplifier U9, the other end of capacitor C4 and resistance R81
The other end at end, the resistance R81 connects the output end of amplifier U9 and one end of resistance R184 simultaneously, the resistance R88's
The other end of other end ground connection, the resistance R184 connects the anode of diode D33, the cathode and capacitor of diode D36 simultaneously
One end of C11, the anode of the diode D36 and the other end of capacitor C11 are grounded simultaneously, and the cathode of the diode D33 connects
One end of connecting resistance R211, the other end of the resistance R211 connect one end of resistance R186 and capacitor C116, the electricity simultaneously
The other end for hindering R186 and capacitor C116 connects resistance R190, resistance R47, resistance R222, resistance R52, resistance R189 simultaneously
One end, the anode of the other end connection diode D28 of the resistance R190, the cathode of diode D28 connect capacitor C108 simultaneously
The other end and diode D29 anode, diode D29 cathode connection resistance R47 the other end, the resistance R52's is another
One end connects the reverse input end of the error amplifier, and the diode D34 is zener diode, and the diode D28 is
Switching diode, the triode are NPN type triode.
The present invention have the following advantages that compared with prior art and the utility model has the advantages that
The voltage value of error amplifier reverse input end of the present invention is controlled by voltage sample control unit, the first current sample
Unit, the second current sample control unit three signals collected codetermine, the first current sample control unit and second
Current sample control unit forms the first loop and the second loop in circuit, and the sample rate current in two loops passes through different width
The Voltage loop and electric current loop of error originated from input amplifier and circuit presets carry out application condition, the partial pressure of the first loop after the amplification of degree
Network values are greater than the second loop, and the sample rate current of the first loop is input to the electricity of error amplifier reversely inputted after amplification
Pressure value is far smaller than the second loop, therefore the second loop response degree is more violent than the first loop, and entire circuit passes through the first ring
Road and the second loop adjust output electric current jointly to achieve the purpose that stabling current, while also functioning to the effect flowed.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a kind of principle flow chart of the DCDC current control circuit of fuel cell car.
Fig. 2 is a kind of circuit diagram of the DCDC current control circuit of fuel cell car.
Specific embodiment
Present invention will now be described in further detail with reference to the embodiments and the accompanying drawings, but embodiments of the present invention are unlimited
In this.
Specific implementation process of the invention is as follows:
As shown in Figure 1 to Figure 2, the DCDC current control circuit of a kind of fuel cell car, including voltage sample control are single
Member, the first current sample control unit, the second current sample control unit, error amplifier and PWM generator, the voltage are adopted
Sample control unit acquires the output voltage of fuel cell, and the first current sample control unit and the control of the second current sample are single
Member acquires the output electric current of fuel cell, the voltage sample control unit, the first current sample control unit and second simultaneously
The output end of current sample control unit is connected to the input terminal of the error amplifier, the output of the error amplifier simultaneously
End connects the input terminal of the PWM generator, and the output end connection power of the PWM generator opens up benefit.
The voltage sample control unit include resistance R196, resistance R191, resistance R192, resistance R185, resistance R193,
Resistance R197, resistance R217, resistance R207, resistance R222, resistance R189, resistance R52, capacitor C106, capacitor C107, capacitor
C109；The first current sample control unit includes resistance R88, resistance R89, diode D34, capacitor C39, resistance R87, electricity
Hinder R86, amplifier U10, resistance R223, resistance R195, capacitor C110, resistance R198, resistance R199, resistance R194, resistance
R187, triode Q34；The second current sample control unit includes resistance R83, resistance R84, diode D6, capacitor C4, electricity
Hinder R88, resistance R81, amplifier U9, resistance R184, diode D36, diode D33, capacitor C11, resistance R211, resistance
R186, capacitor C116, resistance R190, resistance R47, capacitor C108, diode D28, diode D29；
The resistance R196, resistance R191, resistance R192, resistance R185, resistance R193, resistance R197 are serially connected, institute
State resistance R196, capacitor C106, capacitor C107, capacitor C109 one end and meanwhile be connected to voltage acquisition port VO_VF, the electricity
Hold C106, capacitor C107, capacitor C109 the other end be connected to one end of resistance R185 and resistance R193, the resistance simultaneously
The R197 other end connects one end of capacitor C110, resistance R198, resistance R199, capacitor C108 and resistance R217, the electricity simultaneously
One end of resistance R88 and resistance R89 is separately connected current sample port OV+, OV-, and the other end of resistance R88 connects diode simultaneously
One input terminal of the cathode of D34, capacitor C39, one end of resistance R87 and amplifier U10, another termination of the resistance R87
Ground, the other end of another input terminal connection capacitor C39 of the amplifier U10, the other end of the resistance R89 connect simultaneously
The anode of diode D34 and one end of resistance R86, the other end of the resistance R86 connect simultaneously amplifier U10 output end and
One end of resistance R223, one end of the other end connection resistance R195 of the resistance R223, the other end of the resistance R195 are same
When connection one end of resistance R194, the base stage of triode Q34, resistance R198, capacitor C110 the other end, the triode Q34
Collector connection resistance R187 one end, the other end of the resistance R187 and resistance R194 is grounded simultaneously；
One end of the resistance R83 and resistance R84 is separately connected current sample port, and the other end of resistance R83 connects simultaneously
One end of the cathode of diode D6, an input terminal of amplifier U9, capacitor C4 and resistance R88 is connect, the resistance R84's is another
It holds while connecting the one of the anode of diode D6, another input terminal of amplifier U9, the other end of capacitor C4 and resistance R81
The other end at end, the resistance R81 connects the output end of amplifier U9 and one end of resistance R184 simultaneously, the resistance R88's
The other end of other end ground connection, the resistance R184 connects the anode of diode D33, the cathode and capacitor of diode D36 simultaneously
One end of C11, the anode of the diode D36 and the other end of capacitor C11 are grounded simultaneously, and the cathode of the diode D33 connects
One end of connecting resistance R211, the other end of the resistance R211 connect one end of resistance R186 and capacitor C116, the electricity simultaneously
The other end for hindering R186 and capacitor C116 connects resistance R190, resistance R47, resistance R222, resistance R52, resistance R189 simultaneously
One end, the anode of the other end connection diode D28 of the resistance R190, the cathode of diode D28 connect capacitor C108 simultaneously
The other end and diode D29 anode, diode D29 cathode connection resistance R47 the other end, the resistance R52's is another
One end connects the reverse input end of the error amplifier.In the present embodiment, the diode D34 is zener diode, described
Diode D28 is switching diode, and the triode is NPN type triode.
The operation principle of the present invention is that: the voltage of the end the VO_VF sampling fuel cell of the voltage sample control unit
The electric current of the end OV+, OV- sampling fuel cell of signal, the first current sample control unit and the second current sample control unit
Signal, sampled voltage signal are divided by resistance R196, R191, R192, R185, R193, R217, R207, R222, R189
Pressure, ratio are 850V-5V (zero load), then voltage division signal is input to the reverse input end of error amplifier, first electricity
Stream controlling of sampling unit and the second current sample control unit are respectively formed the first loop 1 and the second loop 2 in circuit, and first
The electricity of sample rate current error originated from input amplifier and circuit presets after the amplification of different amplitudes in loop 1 and the second loop 2
Pressure ring and electric current loop carry out application condition.
Wherein, capacitor C107, capacitor C109, capacitor C106 are 10nF capacitor, dry for preventing voltage sampling signal from receiving
It disturbs, U10 and U9 are operational amplifier, and it is about 56.7 times that the amplification factor of U10, which is R86/R89, and corresponding current signal samples ratio
Example is 35A-10V；The amplification factor of U10 is that R81/R84 is about 39.6 times, and corresponding current sampling signal ratio is 35A-7V,
Capacitor C4 and capacitor C39 is 330pF, for removing the clutter of sampled signal.When fuel cell is unloaded, current sample 0,
First loop 1 and the second loop 2 are ineffective, be sent at this time error amplifier signal V (V indicate error amplifier it is reversed
Input terminal voltage) all provided by VO_VF；When the load of fuel cell increases, voltage can drop to certain amplitude, so
After be slowly increased, this step can be controlled by plug-in, and electric current can also increase with the increase of voltage in this process,
The current sample of first loop 1 and the second loop 2 can also increase therewith, at this time voltage sample VO_VF and two current sample OV
+, OV- collective effect control V, the decline of VO_VF voltage causes V to decline, the second loop 2 by resistance R184, R211, R186,
R189 is divided so that V is increased, and the first loop can also make the ground level current potential of PNP type triode Q34 rise, lead to emitting stage current potential
Corresponding to increase, so that V is increased, V signal is codetermined by three sampled signals, due to when output voltage is relative to zero load
Output voltage is small, so the V when signal V that three sampled signals are superimposed also can be than zero load is small, namely is input at this time
The reverse input end of error amplifier compared to circuit presets Voltage loop or electric current loop value it is small, circuit will by feed back come
Output electric current is adjusted, until reaching stable.The potential-divider network of first loop 1 is larger relative to the potential-divider network value of the second loop 2,
That is the voltage that the electric current of the first loop 1 sampling is input to error amplifier reverse input end after amplification is far smaller than the second ring
Road 2, therefore 2 responsiveness of the second loop is more acutely than the first loop 1, entire circuit passes through ring the first loop 1 and the second loop 2
Common adjust makes output electric current reach stable, while also functioning to the effect flowed.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (5)
1. a kind of DCDC current control circuit of fuel cell car, it is characterised in that: including voltage sample control unit, first
Current sample control unit, the second current sample control unit, error amplifier and PWM generator, the voltage sample control
Unit acquires the output voltage of fuel cell, and the first current sample control unit and the second current sample control unit are simultaneously
The output electric current of fuel cell is acquired, the voltage sample control unit, the first current sample control unit and the second electric current are adopted
The output end of sample control unit is connected to the input terminal of the error amplifier, the output end connection of the error amplifier simultaneously
The output end connection power of the input terminal of the PWM generator, the PWM generator opens up benefit.
2. a kind of DCDC current control circuit of fuel cell car according to claim 1, it is characterised in that: the electricity
Pressing controlling of sampling unit includes resistance R196, resistance R191, resistance R192, resistance R185, resistance R193, resistance R197, resistance
R217, resistance R207, resistance R222, resistance R189, resistance R52, capacitor C106, capacitor C107, capacitor C109；First electricity
Flowing controlling of sampling unit includes resistance R88, resistance R89, diode D34, capacitor C39, resistance R87, resistance R86, amplifier
U10, resistance R223, resistance R195, capacitor C110, resistance R198, resistance R199, resistance R194, resistance R187, triode Q34；
The second current sample control unit include resistance R83, resistance R84, diode D6, capacitor C4, resistance R88, resistance R81,
Amplifier U9, resistance R184, diode D36, diode D33, capacitor C11, resistance R211, resistance R186, capacitor C116, resistance
R190, resistance R47, capacitor C108, diode D28, diode D29；
The resistance R196, resistance R191, resistance R192, resistance R185, resistance R193, resistance R197 are serially connected, the electricity
Resistance R196, capacitor C106, capacitor C107, capacitor C109 one end be connected to voltage acquisition port, the capacitor C106, electricity simultaneously
Hold C107, the other end of capacitor C109 is connected to one end of resistance R185 and resistance R193, the resistance R197 other end simultaneously
One end of capacitor C110, resistance R198, resistance R199, capacitor C108 and resistance R217, the resistance R88 and resistance are connected simultaneously
One end of R89 is separately connected current sample port, the other end of resistance R88 connect simultaneously the cathode of diode D34, capacitor C39,
One end of resistance R87 and an input terminal of amplifier U10, the other end ground connection of the resistance R87, the amplifier U10's
Another input terminal connects the other end of capacitor C39, the other end of the resistance R89 connect simultaneously diode D34 anode and
The other end of one end of resistance R86, the resistance R86 connects the output end of amplifier U10 and one end of resistance R223, institute simultaneously
One end of the other end connection resistance R195 of resistance R223 is stated, the other end of the resistance R195 connects the one of resistance R194 simultaneously
End, the base stage of triode Q34, resistance R198, capacitor C110 the other end, the collector of the triode Q34 connects resistance
The other end of one end of R187, the resistance R187 and resistance R194 are grounded simultaneously；
One end of the resistance R83 and resistance R84 is separately connected current sample port, and the other end of resistance R83 connects two simultaneously
One end of the cathode of pole pipe D6, an input terminal of amplifier U9, capacitor C4 and resistance R88, the other end of the resistance R84 are same
When the connection anode of diode D6, another input terminal of amplifier U9, the other end of capacitor C4 and one end of resistance R81, institute
It states the other end of resistance R81 while connecting the output end of amplifier U9 and one end of resistance R184, the other end of the resistance R88
The other end of ground connection, the resistance R184 connects the one of the anode of diode D33, the cathode of diode D36 and capacitor C11 simultaneously
End, the anode of the diode D36 and the other end of capacitor C11 are grounded simultaneously, and the cathode of the diode D33 connects resistance
One end of R211, the other end of the resistance R211 connect one end of resistance R186 and capacitor C116, the resistance R186 simultaneously
And the other end of capacitor C116 connects one end of resistance R190, resistance R47, resistance R222, resistance R52, resistance R189, institute simultaneously
The anode of the other end connection diode D28 of resistance R190 is stated, the cathode of diode D28 connects the other end of capacitor C108 simultaneously
And the anode of diode D29, the other end of the cathode connection resistance R47 of diode D29, the other end connection of the resistance R52
The reverse input end of the error amplifier.
3. a kind of DCDC current control circuit of fuel cell car according to claim 1, it is characterised in that: described two
Pole pipe D34 is zener diode.
4. a kind of DCDC current control circuit of fuel cell car according to claim 1, it is characterised in that: described two
Pole pipe D28 is switching diode.
5. a kind of DCDC current control circuit of fuel cell car according to claim 1, it is characterised in that: described three
Pole pipe is NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810832400.7A CN108964432B (en) | 2018-07-26 | 2018-07-26 | DCDC current control circuit of fuel cell automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810832400.7A CN108964432B (en) | 2018-07-26 | 2018-07-26 | DCDC current control circuit of fuel cell automobile |
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| Publication Number | Publication Date |
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| CN108964432A true CN108964432A (en) | 2018-12-07 |
| CN108964432B CN108964432B (en) | 2023-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810832400.7A Active CN108964432B (en) | 2018-07-26 | 2018-07-26 | DCDC current control circuit of fuel cell automobile |
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| Publication number | Publication date |
|---|---|
| CN108964432B (en) | 2023-09-29 |
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