CN105098946A - Electric automobile and charging device thereof and start control method of charging device - Google Patents
Electric automobile and charging device thereof and start control method of charging device Download PDFInfo
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- CN105098946A CN105098946A CN201510512488.0A CN201510512488A CN105098946A CN 105098946 A CN105098946 A CN 105098946A CN 201510512488 A CN201510512488 A CN 201510512488A CN 105098946 A CN105098946 A CN 105098946A
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Abstract
The invention discloses an electric automobile and a charging device thereof and a start control method of the charging device. The method comprises the following steps: detecting the voltage and current of an AC power supply input to a rectifying circuit and detecting the output voltage of the rectifying circuit; obtaining the phase of the AC power supply according to the voltage of the AC power supply, and judging whether the phase of the AC power supply meets preset start conditions; and if judging that the phase of the AC power supply meets the preset start conditions, controlling the rectifying circuit to start to work to enable the charging device to start, and in the starting process of the charging device, controlling the rectifying circuit according to the current of the AC power supply, the output voltage of the rectifying circuit and the phase of the AC power supply. By controlling the charging device to start at the appropriate phase of the AC power supply, start surge current is suppressed; and whole process control of the starting is realized in the starting process according to the phase of the AC power supply, so that overlarge start surge current can be prevented more effectively, and the service life of the charging device is improved.
Description
Technical field
The present invention relates to electric vehicle engineering field, particularly a kind of startup control method of the charging device for electric automobile, a kind of charging device for electric automobile and a kind of electric automobile.
Background technology
The vehicle-mounted charging device of electric automobile often produces larger impulse current when initial start, easily causes overcurrent or overvoltage protection, and long-play can reduce the life-span of charging device.Usually adopt the mode delayed to solve the excessive temperature of inrush current in correlation technique, that is, improve voltage given or given value of current gradually when initial start to reach the object suppressing inrush current.
But the shortcoming that correlation technique exists reckons without the phase place of Startup time line voltage, still may occur larger impulse current when the voltage given carved upon start up or given value of current do not mate with power network current phase place.Therefore, correlation technique needs to improve.
Summary of the invention
The present invention is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, one object of the present invention is the startup control method proposing a kind of charging device for electric automobile, and the method can avoid excessive inrush current further.
Another object of the present invention is to propose a kind of charging device for electric automobile.Another object of the present invention is to propose a kind of electric automobile.
For achieving the above object, one aspect of the present invention embodiment proposes a kind of startup control method of the charging device for electric automobile, described charging device comprises rectification circuit, described startup control method comprises the following steps: detect the voltage and current being input to the AC power of described rectification circuit, and detect the output voltage of described rectification circuit; Obtain the phase place of described AC power according to the voltage of described AC power, and judge whether the phase place of described AC power meets the entry condition preset; If judge that the phase place of described AC power meets described default entry condition, then control described rectification circuit to start working described charging device is started, and in the start-up course of described charging device, the phase place according to the electric current of described AC power, the output voltage of described rectification circuit and described AC power controls described rectification circuit.
According to the startup control method of the charging device for electric automobile that the embodiment of the present invention proposes, if judge that the phase place of AC power meets default entry condition, then control rectification circuit to start working charging device is started, and in the start-up course of charging device, the phase place according to the electric current of AC power, the output voltage of rectification circuit and AC power controls rectification circuit.Thus, start in the phase place of suitable AC power by controlling charging device, to suppress inrush current, and in start-up course, the Whole Process Control controlling to realize starting is carried out according to the phase place of AC power, thus more effectively avoid excessive inrush current, promote the useful life of charging device.
According to some embodiments of the present invention, process by the voltage of mode to described AC power of phase-locked loop the phase place obtaining described AC power.
According to some embodiments of the present invention, as-θ
e_limit≤ θ
e≤ θ
e_limittime, judge that the phase place of described AC power meets described default entry condition, wherein, θ
efor the phase place of described AC power, θ
e_limitfor the phase boundaries of default AC power.
According to some embodiments of the present invention, in the start-up course of described charging device, the direct voltage given way delayed is adopted to control described rectification circuit.
According to some embodiments of the present invention, the direct voltage given way that described employing has been delayed controls described rectification circuit, specifically comprise: PI is carried out to the voltage difference between the given voltage of direct current and the output voltage of described rectification circuit and controls to obtain the first regulated value, and obtain given electric current according to the phase place of described first regulated value and described AC power; The duty ratio that PI controls to obtain described rectification circuit is carried out to the current differential between described given electric current and the electric current of described AC power, and judges whether described duty ratio is less than or equal to pre-set limit; If judge that described duty ratio is less than or equal to described pre-set limit, then increase the given voltage of described direct current.
For achieving the above object, the present invention on the other hand embodiment proposes a kind of charging device for electric automobile, and comprising: rectification circuit, the input of described rectification circuit is in order to connect AC power, voltage conversion circuit, the input of described voltage conversion circuit is connected with the output of described rectification circuit, and the output of described voltage conversion circuit is in order to connect the electrokinetic cell of described electric automobile, first voltage detecting circuit, described first voltage detecting circuit is for detecting the voltage of described AC power, second voltage detecting circuit, described second voltage detecting circuit is for detecting the output voltage of described rectification circuit, first current detection circuit, described first current detection circuit is for detecting the electric current of described AC power, control module, described control module respectively with described rectification circuit, described first voltage detecting circuit, described second voltage detecting circuit is connected with described first current detection circuit, described control module is used for the phase place obtaining described AC power according to the voltage of described AC power, and judge whether the phase place of described AC power meets the entry condition preset, wherein, if judge that the phase place of described AC power meets described default entry condition, described control module then controls described rectification circuit and starts working described charging device is started, and in the start-up course of described charging device, described control module is according to the electric current of described AC power, the output voltage of described rectification circuit and the phase place of described AC power control described rectification circuit.
According to the charging device for electric automobile that the embodiment of the present invention proposes, if judge that the phase place of AC power meets default entry condition, control module then controls rectification circuit and starts working charging device is started, and in the start-up course of charging device, the phase place according to the electric current of AC power, the output voltage of rectification circuit and AC power controls rectification circuit.Thus, start in the phase place of suitable AC power by controlling charging device, to suppress inrush current, and in start-up course, the Whole Process Control controlling to realize starting is carried out according to the phase place of AC power, thus more effectively avoid excessive inrush current, promote the useful life of charging device.
According to some embodiments of the present invention, described control module adopts the voltage of mode to described AC power of phase-locked loop to process the phase place obtaining described AC power.
According to some embodiments of the present invention, as-θ
e_limit≤ θ
e≤ θ
e_limittime, described control module judges that the phase place of described AC power meets described default entry condition, wherein, and θ
efor the phase place of described AC power, θ
e_limitfor the phase boundaries of default AC power.
According to some embodiments of the present invention, in the start-up course of described charging device, described control module adopts the direct voltage given way delayed to control described rectification circuit.
According to some embodiments of the present invention, described control module specifically comprises: voltage given unit, for providing direct current given voltage; Voltage loop PI controller, described Voltage loop PI controller is used for carrying out PI to the voltage difference between the given voltage of described direct current and the output voltage of described rectification circuit and controls to obtain the first regulated value; Power factor correction unit, described power factor correction unit is used for obtaining given electric current according to the phase place of described first regulated value and described AC power; Electric current loop PI controller, described electric current loop PI controller is used for carrying out to the current differential between described given electric current and the electric current of described AC power the duty ratio that PI controls to obtain described rectification circuit; Pulse-width modulation PWM control unit, described PWM control unit is for judging whether described duty ratio is less than or equal to pre-set limit, and when judging that described duty ratio is less than or equal to described pre-set limit, increase the given voltage of described direct current by controlling described voltage given unit.
For achieving the above object, another aspect of the invention embodiment proposes a kind of electric automobile, comprises described charging device.
According to the electric automobile that the embodiment of the present invention proposes, by the charging device of above-described embodiment, the inrush current of Startup time can be suppressed, more effectively avoid excessive inrush current, promote the useful life of charging device.
Accompanying drawing explanation
Fig. 1 is the flow chart of the startup control method of the charging device for electric automobile according to the embodiment of the present invention;
Fig. 2 is according to an embodiment of the invention for the flow chart of the startup control method of the charging device of electric automobile;
Fig. 3 is the block diagram of the charging device for electric automobile according to the embodiment of the present invention;
Fig. 4 is according to an embodiment of the invention for the circuit theory diagrams of the charging device of electric automobile; And
Fig. 5 is according to an embodiment of the invention for the control principle drawing of the charging device of electric automobile.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
Below with reference to the accompanying drawings describe the startup control method of the charging device for electric automobile that the embodiment of the present invention proposes, for electric automobile charging device and there is the electric automobile of this electric supply installation, wherein, charging device is used for the power battery charging for electric automobile.
Wherein, as shown in Figure 4, charging device comprises rectification circuit 10 and voltage conversion circuit 20.Wherein, the input of rectification circuit 10 is connected with AC power AC, and rectification circuit 10 is for carrying out rectification to export direct current to the alternating current of AC power AC; The input of voltage conversion circuit 20 is connected with the output of rectification circuit 10, the input of voltage conversion circuit 20 is connected with electrokinetic cell 100, to the output voltage adjustment of rectification circuit 10, voltage conversion circuit 20 is for thinking that electrokinetic cell 100 provides the voltage and current of constant charge.In addition, charging device also comprises the first electric capacity C1, and the first electric capacity C1 can be connected in parallel between rectification circuit 10 and voltage conversion circuit 20, and the first electric capacity C1 is for keeping the stable of the output voltage of rectification circuit 10.
Particularly, as shown in Figure 4, rectification circuit 10 can comprise first to fourth IGBT pipe, the emitter of the one IGBT pipe Q1 is connected with the collector electrode of the 2nd IGBT pipe Q2, the collector electrode of the one IGBT pipe Q1 is connected with the collector electrode of the 3rd IGBT pipe Q3, the emitter of the 3rd IGBT pipe Q3 is connected with the collector electrode of the 4th IGBT pipe Q4, and the emitter of the 4th IGBT pipe Q4 is connected with the emitter of the 2nd IGBT pipe Q2.Wherein, between one IGBT pipe Q1 and the 2nd IGBT pipe Q2, there is first node A, first node A is connected with one end of AC power AC as the first input end of rectification circuit 10, between 3rd IGBT pipe Q3 and the 4th IGBT pipe Q4, there is Section Point B, Section Point B is connected with the other end of AC power AC as the second input of rectification circuit 10, between one IGBT pipe Q1 and the 3rd IGBT pipe Q3, there is the 3rd node, 3rd node is as the first output of rectification circuit 10, between 4th IGBT pipe Q4 and the 2nd IGBT pipe Q2, there is the 4th node, 4th node is as the second output of rectification circuit 10.
Further, first to fourth IGBT pipe is connected with the control module of charging device, to receive PWM (PulseWidthModulation, pulse width modulation) signal, and can be controlled the output current of rectification circuit 10 by the duty ratio controlling pwm signal.
As shown in Figure 4, voltage conversion circuit 20 is BUCK circuit, the 5th IGBT pipe Q5 and the 6th IGBT pipe Q6 can be comprised, wherein, the collector electrode of the 5th IGBT pipe Q5 is connected with the first output of rectification circuit 10, be connected with the positive pole of electrokinetic cell 100 after the emitter of the 5th IGBT pipe Q5 is connected with the collector electrode of the 6th IGBT pipe Q6, be connected with the negative pole of electrokinetic cell 100 after the emitter of the 6th IGBT pipe Q6 is connected with the second output of rectification circuit 10.
And, 5th IGBT pipe Q5 is connected with the control module of charging device with the 6th IGBT pipe Q6, to receive PWM (PulseWidthModulation, pulse width modulation) signal, and the voltage-regulation ratio of voltage conversion circuit 20 can be controlled by the duty ratio controlling pwm signal.
Further, charging device also can comprise the first inductance L 1 and the second electric capacity C2, wherein, first inductance L 1 is connected between the 5th IGBT pipe Q5 and electrokinetic cell 100, one end of first inductance L 1 is connected with the emitter of the 5th IGBT pipe Q5, be connected with the positive terminal of electrokinetic cell 100 after the other end of the first inductance L 1 is connected with one end of the second electric capacity C2, the other end of the second electric capacity C2 is connected with the emitter of the 6th IGBT pipe Q6.
It should be noted that the filter circuit that the first inductance L 1 and the second electric capacity C2 are formed can carry out filtering process to the output voltage of voltage conversion circuit 20, think the voltage and current that electrokinetic cell 100 provides stable.
As mentioned above, rectification circuit 10 is by the voltage u of AC power
srectification exports as u
dC, and keep u
dCstable, and by chop control voltage conversion circuit 20 for electrokinetic cell 100 provides the curtage of constant charge.
Larger inrush current is often produced in charging device when initial start, based on this, the startup control method of the charging device for electric automobile of the embodiment of the present invention, by the Startup time of the phase control charging device of AC power, to suppress inrush current.
As shown in Figure 1, the startup control method of the charging device for electric automobile of the embodiment of the present invention comprises the following steps:
S1: detect the voltage and current being input to the AC power of rectification circuit, and detect the output voltage of rectification circuit.
Wherein, detect the electric current of AC power by the current detection circuit such as sampling resistor or current transformer, and detect the voltage of AC power and the output voltage of rectification circuit by the voltage detecting circuit such as divider resistance or voltage transformer.
According to a concrete example of the present invention, the voltage and current of AC power can be preferably the voltage and current of utility grid.
S2: the phase place obtaining AC power according to the voltage of AC power, and judge whether the phase place of AC power meets the entry condition preset.
According to one embodiment of present invention, the voltage of mode to AC power by phase-locked loop processes the phase place obtaining AC power.That is, phase-locked loop can calculate the phase place of AC power according to the potentiometer of AC power, namely says that the output of phase-locked loop is the phase place of AC power.
S3: if judge that the phase place of AC power meets default entry condition, then control rectification circuit to start working charging device is started, and in the start-up course of charging device, the phase place according to the electric current of AC power, the output voltage of rectification circuit and AC power controls rectification circuit.
Should be understood that, if judge that the phase place of AC power does not meet the entry condition preset, then return step S1 after waiting for Preset Time, continue to detect the voltage of AC power until the phase place of AC power meets default entry condition.Wherein, Preset Time can be less than or equal to 10ms.
That is, after charging device receives charge initiation order, do not start immediately, but start to judge whether the phase place of AC power meets the entry condition preset, when judging to meet the entry condition preset, charging device starts to start, and judges after judging to wait for Preset Time when not meeting the entry condition preset next time again.Thus, starting in the phase place of proper range by controlling charging device, realizing the suppression to inrush current.
Specifically, the instrument face plate of vehicle can arrange charge initiation button, user controls charging device startup by triggering charge initiation button.After charging device is connected with AC power and electrokinetic cell respectively, user can trigger charge initiation button to send charge initiation order to charging device, after charging device receives charge initiation order, first judge whether the phase place of AC power meets the entry condition preset, if meet the entry condition preset, then to rectified current output pwm signal, start to carry out rectification to the alternating current of AC power to control rectification circuit, charging device starts to power battery charging, the starting current that now charging device produces can be less than predetermined current threshold, thus avoid over-current phenomenon avoidance occurs, avoid damaging components and parts, if do not meet the entry condition preset, then do not control rectification circuit and carry out rectification, charging device does not charge to electrokinetic cell.Thus; charging device starts when the phase place of AC power meets default entry condition to start; in start-up course; according to the duty ratio of the phase place adjustment pwm signal of the electric current of AC power, the output voltage of rectification circuit and AC power; to control rectification circuit, avoid overcurrent protection.
According to a specific embodiment of the present invention, as-θ
e_limit≤ θ
e≤ θ
e_limittime, judge that the phase place of AC power meets default entry condition, wherein, θ
efor the phase place of AC power, θ
e_limitfor the phase boundaries of default AC power.
According to an example of the present invention, the phase boundaries θ of default AC power
e_limitfollowing formula can be met:
Wherein, u
pI_I_limitensure the maximum duty cycle of inrush current in predetermined current threshold, K
p_Ifor proportionality coefficient, u
pI_Ucan be considered fixed value at Startup time, I is the current amplitude of AC power.
Specifically, the duty ratio that namely duty ratio of rectification circuit outputs to the pwm signal of rectification circuit can meet following formula:
u
PI_I＝K
p_I·(u
PI_U-I)sin(θ
e)，
Wherein, u
pI_Ifor the duty ratio of rectification circuit, K
p_Ifor proportionality coefficient, u
pI_Ucan be considered fixed value at Startup time, I is the current amplitude of AC power, θ
efor the phase place of AC power.
When the phase theta of AC power
ein N π (wherein N=0,1,2 ...) near time, always can find as lower area | sin (θ
e) |≤ε, makes the duty ratio of Startup time meet:
u
PI_I＝K
p_I·(u
PI_U-I)sin(θ
e)≤u
PI_I_limit，
Wherein, u
pI_I_limitbe ensure the maximum duty cycle of inrush current in predetermined current threshold, namely say u
pI_I_limitcan determine according to predetermined current threshold.
Like this, ε can according to following formulae discovery:
Thus obtain the phase boundaries of the AC power preset: θ
e_limit=| arcsin (ε) |.
Like this, as-θ
e_limit≤ θ
e≤ θ
e_limittime, rectification circuit can be controlled and start working charging device is started, and larger inrush current can not be produced.
Further, according to one embodiment of present invention, in the start-up course of charging device, the direct voltage given way delayed can be adopted to control rectification circuit.Should be understood that, adopting the direct voltage given way delayed to be increases the given voltage of direct current gradually.
Particularly, as shown in Figure 2, adopt the direct voltage given way delayed to control rectification circuit, specifically comprise:
S10: PI (Proportional-Integral) is carried out to the voltage difference between the given voltage of direct current and the output voltage of rectification circuit and controls to obtain the first regulated value, and obtain given electric current according to the phase place of the first regulated value and AC power.
That is, can arrange a Voltage loop PI controller, the voltage difference be input as between the given voltage of direct current and the output voltage of rectification circuit of Voltage loop PI controller, Voltage loop PI controller is carrying out voltage difference exporting the first regulated value after PI controls.
S20: the duty ratio that PI controls to obtain rectification circuit is carried out to the current differential between given electric current and the electric current of AC power, and judges whether duty ratio is less than or equal to pre-set limit.
That is, an electric current loop PI controller can be set, the current differential be input as between given electric current and the electric current of AC power of electric current loop PI controller, electric current loop PI controller is carrying out the duty ratio exporting the second regulated value and rectification circuit after PI controls to current differential.
S30: if judge that duty ratio is less than or equal to pre-set limit, then increase the given voltage of direct current.
Be understandable that, if judge that duty ratio is greater than pre-set limit, then stop increasing the given voltage of direct current, namely keep the given voltage of current direct current.
Specifically, suppose that the given voltage of direct current is
the output voltage of rectification circuit and direct voltage value of feedback are u
dC, being so input as of Voltage loop PI controller
Suppose that Voltage loop PI controller adoption rate controls, the proportionality coefficient of proportional control is K
p_U, output i.e. the first regulated value that so PI controls is:
After acquisition first regulated value, can according to the phase theta of the first regulated value and AC power
eobtain given electric current, given electric current is
to realize unit power factor rectifier.
The electric current of AC power and current feedback values can be i this moment
l=Isin (θ
e).
Suppose that electric current loop PI controller adoption rate controls, the proportionality coefficient of proportional control is K
p_I, so the output of electric current loop PI controller is:
Wherein, the output u of electric current loop PI controller
pI_Ibe the duty ratio of rectification circuit.
It should be noted that, inrush current results from the Startup time of rectification circuit, at Startup time u
pI_Icross conference and cause larger inrush current.Further, at the given voltage of Startup time direct current
with the output voltage u of rectification circuit
dCcan be considered fixed value, so the output u of Voltage loop PI controller
pI_Ualso be fixed value.
From formula (1), the output u of electric current loop PI controller
pI_Idepend on (u
pI_U-I) and the phase theta of AC power
e.Like this, in the startup control method of the embodiment of the present invention, adopt the direct voltage given way delayed can make the u of Startup time
pI_Uless, simultaneously by controlling the phase theta of rectification circuit in suitable AC power
estart, current amplitude I and the sin (θ of AC power can be made
e) less, such u
pI_U, I and sin (θ
e) all less output u that can make electric current loop PI controller
pI_Iless, and then inrush current is less, avoids because I value is excessive and causes larger inrush current.
In the start-up course of charging device, adopt the direct voltage given way delayed also to judge that the duty ratio thing of rectification circuit is all less than or equal to pre-set limit u always
pI_I_limit, namely judge whether to meet following formula:
u
PI_I＝K
p_I·(u
PI_U-I)sin(θ
e)≤u
PI_I_limit，
If met, then increase the given voltage of direct current, namely the given voltage of current direct current adds and presets adjustment voltage; If do not met, then stop increasing the given voltage of direct current, until judge to meet above-mentioned formula.
In sum, according to the startup control method of the charging device for electric automobile that the embodiment of the present invention proposes, if judge that the phase place of AC power meets default entry condition, then control rectification circuit to start working charging device is started, and in the start-up course of charging device, the phase place according to the electric current of AC power, the output voltage of rectification circuit and AC power controls rectification circuit.Thus, start in the phase place of suitable AC power by controlling charging device, to suppress inrush current, and in start-up course, the Whole Process Control controlling to realize starting is carried out according to the phase place of AC power, thus more effectively avoid excessive inrush current, promote the useful life of charging device.
In order to perform the startup control method of above-described embodiment, the embodiment of the present invention also proposed a kind of charging device for electric automobile.
Fig. 3 is the block diagram of the charging device for electric automobile according to the embodiment of the present invention, as shown in Figure 3, the charging device for electric automobile comprises: rectification circuit 10, voltage conversion circuit 20, first voltage detecting circuit 30, second voltage detecting circuit 40, first current detection circuit 50 and control module 60.
Wherein, the input of rectification circuit 10 is in order to connect AC power AC; The input of voltage conversion circuit 20 is connected with the output of rectification circuit 10, and the output of voltage conversion circuit 20 is in order to the electrokinetic cell 100 of connecting electric automobile; First voltage detecting circuit 30 is for detecting the voltage of AC power AC; Second voltage detecting circuit 40 is for detecting the output voltage of rectification circuit 10; First current detection circuit 50 is for detecting the electric current of AC power AC.
Wherein, first current detection circuit 50 detects the electric current of AC power AC by the current detection circuit such as sampling resistor or current transformer, and the first voltage detecting circuit 30 and the second voltage detecting circuit 40 come the voltage of corresponding detection AC power AC and the output voltage of rectification circuit 10 by the voltage detecting circuit such as divider resistance or voltage transformer.
According to a concrete example of the present invention, the voltage and current of AC power AC can be preferably the voltage and current of utility grid.
Control module 60 respectively with rectification circuit 10, first voltage detecting circuit 30, second voltage detecting circuit 40 is connected with the first current detection circuit 50, control module 60 is for obtaining the phase place of AC power according to the voltage of AC power AC, and judge whether the phase place of AC power meets the entry condition preset, wherein, if judge that the phase place of AC power meets default entry condition, control module 60 control rectification circuits 40 start working charging device is started, and in the start-up course of charging device, control module 60 is according to the electric current of AC power AC, the output voltage of rectification circuit 10 and the phase place of AC power AC control rectification circuit 10.
Should be understood that, if judge that the phase place of AC power does not meet the entry condition preset, after control module 60 waits for Preset Time, continue to obtain the voltage of AC power until the phase place of AC power AC meets default entry condition.Wherein, Preset Time can be less than or equal to 10ms.
That is, after control module 60 receives charge initiation order, do not start immediately, but start to judge whether the phase place of AC power AC meets the entry condition preset, when judging to meet the entry condition preset, charging device starts to start, and judges after when judging not meet the entry condition preset, control module 60 waits for Preset Time next time again.Thus, starting in the phase place of proper range by controlling charging device, realizing the suppression to inrush current.
Specifically, the instrument face plate of vehicle can arrange charge initiation button, user controls charging device startup by triggering charge initiation button.After charging device is connected with AC power AC and electrokinetic cell 100 respectively, user can trigger charge initiation button to send charge initiation order to charging device, after control module 60 receives charge initiation order, first judge whether the phase place of AC power AC meets the entry condition preset, if meet the entry condition preset, control module 60 is to rectified current 10 output pwm signal, start to carry out rectification to the alternating current of AC power AC to control rectification circuit 10, charging device starts to charge to electrokinetic cell 100, the starting current that now charging device produces can be less than predetermined current threshold, thus avoid over-current phenomenon avoidance occurs, avoid damaging components and parts, if do not meet the entry condition preset, control module 60 does not control rectification circuit 10 and carries out rectification, and charging device does not charge to electrokinetic cell.Thus; charging device starts when the phase place of AC power meets default entry condition to start; in start-up course; control module 60 is according to the duty ratio of the phase place adjustment pwm signal of the electric current of AC power, the output voltage of rectification circuit and AC power; to control rectification circuit 10, avoid overcurrent protection.
According to one embodiment of present invention, as shown in Figure 5, control module 60 adopts the voltage of the mode of phase-locked loop 601 to AC power AC to process to obtain the phase place of AC power AC.That is, phase-locked loop 601 can calculate the phase place of AC power AC according to the potentiometer of AC power AC, namely says that the output of phase-locked loop 601 is the phase place of AC power AC.
According to a specific embodiment of the present invention, as-θ
e_limit≤ θ
e≤ θ
e_limittime, control module 60 judges that the phase place of AC power AC meets default entry condition, wherein, and θ
efor the phase place of AC power AC, θ
e_limitfor the phase boundaries of default AC power AC.
According to an example of the present invention, the phase boundaries θ of default AC power
e_limitfollowing formula can be met:
Wherein, u
pI_I_limitensure the maximum duty cycle of inrush current in predetermined current threshold, K
p_Ifor proportionality coefficient, u
pI_Ucan be considered fixed value at Startup time, I is the current amplitude of AC power.
Specifically, the duty ratio that the duty ratio of rectification circuit 10 and control module 60 output to the pwm signal of rectification circuit 10 can meet following formula:
u
PI_I＝K
p_I·(u
PI_U-I)sin(θ
e)，
Wherein, u
pI_Ifor the duty ratio of rectification circuit 10, K
p_Ifor proportionality coefficient, u
pI_Ucan be considered fixed value at Startup time, I is the current amplitude of AC power AC, θ
efor the phase place of AC power AC.
When the phase theta of AC power
ein N π (wherein N=0,1,2 ...) near time, always can find as lower area | sin (θ
e) |≤ε, makes the duty ratio of Startup time meet:
u
PI_I＝K
p_I·(u
PI_U-I)sin(θ
e)≤u
PI_I_limit，
Wherein, u
pI_I_limitbe ensure the maximum duty cycle of inrush current in predetermined current threshold, namely say u
pI_I_limitcan determine according to predetermined current threshold.
Like this, ε can according to following formulae discovery:
Thus obtain the phase boundaries of the AC power preset: θ
e_limit=| arcsin (ε) |.
Like this, as-θ
e_limit≤ θ
e≤ θ
e_limittime, control module 60 can control rectification circuit 10 and start working charging device is started, and can not produce larger inrush current.
Further, according to one embodiment of present invention, in the start-up course of charging device, control module 60 can adopt the direct voltage given way delayed to control rectification circuit 10.Should be understood that, adopting the direct voltage given way delayed to be increases the given voltage of direct current gradually.
Particularly, as shown in Figure 5, control module 60 specifically comprises: voltage given unit 602, Voltage loop PI controller 603, power factor correction unit 604, electric current loop PI controller 605 and pulse-width modulation PWM control unit 606.
Wherein, voltage given unit 602 is for providing direct current given voltage; Voltage loop PI controller 603 controls to obtain the first regulated value for carrying out PI to the voltage difference between the given voltage of direct current and the output voltage of rectification circuit 10, that is, the voltage difference be input as between the given voltage of direct current and the output voltage of rectification circuit 10 of Voltage loop PI controller 603, Voltage loop PI controller 603 is carrying out voltage difference exporting the first regulated value after PI controls; Power factor correction unit 604 is for obtaining given electric current according to the phase place of the first regulated value and AC power AC; The duty ratio that electric current loop PI controller 605 controls to obtain rectification circuit 10 for carrying out PI to the current differential between given electric current and the electric current of AC power AC, that is, the current differential be input as between given electric current and the electric current of AC power AC of electric current loop PI controller 605, electric current loop PI controller 605 is carrying out the duty ratio exporting the second regulated value and rectification circuit 10 after PI controls to current differential; Pulse-width modulation PWM control unit 606 for judging whether duty ratio is less than or equal to pre-set limit, and when judging that duty ratio is less than or equal to pre-set limit, increases the given voltage of direct current by control voltage to cell 602.
Be understandable that, if judge that duty ratio is greater than pre-set limit, then stop increasing the given voltage of direct current, namely keep the given voltage of current direct current.
Specifically, suppose that the given voltage of direct current is
the output voltage of rectification circuit and direct voltage value of feedback are u
dC, being so input as of Voltage loop PI controller 603
Suppose that Voltage loop PI controller 603 adoption rate controls, the proportionality coefficient of proportional control is K
p_U, so the output of Voltage loop PI controller 603 is:
The output of phase-locked loop 601 is the phase theta of AC power
e, like this, for realizing unit power factor rectifier, power factor correction unit 604 is according to the phase theta of the first regulated value and AC power
eobtaining given electric current is
The electric current of AC power AC that detects of first current detection circuit 50 and current feedback values can be i this moment
l=Isin (θ
e).
Suppose that electric current loop PI controller 605 adoption rate controls, the proportionality coefficient of proportional control is K
p_I, so the output of electric current loop PI controller 605 is:
Wherein, the output u of electric current loop PI controller 605
pI_Ibe the duty ratio of rectification circuit 10.
It should be noted that, inrush current results from the Startup time of rectification circuit, at Startup time u
pI_Icross conference and cause larger inrush current.Further, at the given voltage of Startup time direct current
with the output voltage u of rectification circuit
dCcan be considered fixed value, so the output u of Voltage loop PI controller 603
pI_Ualso be fixed value.
From formula (1), the output u of electric current loop PI controller 605
pI_Idepend on (u
pI_U-I) and the phase theta of AC power
e.Like this, in the charging device of the embodiment of the present invention, control module 60 adopts the direct voltage given way delayed can make the u of Startup time
pI_Uless, simultaneously by controlling the phase theta of rectification circuit 10 at suitable AC power AC
estart, current amplitude I and the sin (θ of AC power AC can be made
e) less, such u
pI_U, I and sin (θ
e) all less output u that can make electric current loop PI controller 605
pI_Iless, and then inrush current is less, avoids because I value is excessive and causes larger inrush current.
In the start-up course of charging device, control module 60 adopts the direct voltage given way delayed also to judge that the duty ratio thing of rectification circuit 10 is all less than or equal to pre-set limit u always
pI_I_limit, namely judge whether to meet following formula:
u
PI_I＝K
p_I·(u
PI_U-I)sin(θ
e)≤u
PI_I_limit，
If met, pulse-width modulation PWM control unit 606 control voltages increase the given voltage of direct current to cell 602, and namely the given voltage of current direct current adds and presets adjustment voltage; If do not met, pulse-width modulation PWM control unit 606 control voltages stop increasing the given voltage of direct current to cell 602, until judge to meet above-mentioned formula.
In sum, according to the charging device for electric automobile that the embodiment of the present invention proposes, if judge that the phase place of AC power meets default entry condition, control module then controls rectification circuit and starts working charging device is started, and in the start-up course of charging device, the phase place according to the electric current of AC power, the output voltage of rectification circuit and AC power controls rectification circuit.Thus, start in the phase place of suitable AC power by controlling charging device, to suppress inrush current, and in start-up course, the Whole Process Control controlling to realize starting is carried out according to the phase place of AC power, thus more effectively avoid excessive inrush current, promote the useful life of charging device.
Finally, the embodiment of the present invention also been proposed a kind of electric automobile, comprises the charging device of above-described embodiment.Wherein, the input of this charging device is connected with AC power, and the output of charging device is connected with the electrokinetic cell of electric automobile and thinks that electrokinetic cell provides charging voltage and electric current.
Should be understood that, the concrete structure, operation principle etc. of charging device are described in detail in the above-described embodiments, are in succinct object here, repeat no longer one by one.
According to the electric automobile that the embodiment of the present invention proposes, by the charging device of above-described embodiment, the inrush current of Startup time can be suppressed, more effectively avoid excessive inrush current, promote the useful life of charging device.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (11)
1. for a startup control method for the charging device of electric automobile, it is characterized in that, described charging device comprises rectification circuit, and described startup control method comprises the following steps:
Detect the voltage and current being input to the AC power of described rectification circuit, and detect the output voltage of described rectification circuit;
Obtain the phase place of described AC power according to the voltage of described AC power, and judge whether the phase place of described AC power meets the entry condition preset; And
If judge that the phase place of described AC power meets described default entry condition, then control described rectification circuit to start working described charging device is started, and in the start-up course of described charging device, the phase place according to the electric current of described AC power, the output voltage of described rectification circuit and described AC power controls described rectification circuit.
2. the startup control method of the charging device for electric automobile according to claim 1, is characterized in that, processes by the voltage of mode to described AC power of phase-locked loop the phase place obtaining described AC power.
3. the startup control method of the charging device for electric automobile according to claim 1 and 2, is characterized in that, as-θ
e_limit≤ θ
e≤ θ
e_limittime, judge that the phase place of described AC power meets described default entry condition, wherein, θ
efor the phase place of described AC power, θ
e_limitfor the phase boundaries of default AC power.
4. the startup control method of the charging device for electric automobile according to claim 1, is characterized in that, in the start-up course of described charging device, adopts the direct voltage given way delayed to control described rectification circuit.
5. the startup control method of the charging device for electric automobile according to claim 4, is characterized in that, the direct voltage given way that described employing has been delayed controls described rectification circuit, specifically comprises:
PI is carried out to the voltage difference between the given voltage of direct current and the output voltage of described rectification circuit and controls to obtain the first regulated value, and obtain given electric current according to the phase place of described first regulated value and described AC power;
The duty ratio that PI controls to obtain described rectification circuit is carried out to the current differential between described given electric current and the electric current of described AC power, and judges whether described duty ratio is less than or equal to pre-set limit;
If judge that described duty ratio is less than or equal to described pre-set limit, then increase the given voltage of described direct current.
6. for a charging device for electric automobile, it is characterized in that, comprising:
Rectification circuit, the input of described rectification circuit is in order to connect AC power;
Voltage conversion circuit, the input of described voltage conversion circuit is connected with the output of described rectification circuit, and the output of described voltage conversion circuit is in order to connect the electrokinetic cell of described electric automobile;
First voltage detecting circuit, described first voltage detecting circuit is for detecting the voltage of described AC power;
Second voltage detecting circuit, described second voltage detecting circuit is for detecting the output voltage of described rectification circuit;
First current detection circuit, described first current detection circuit is for detecting the electric current of described AC power; And
Control module, described control module is connected with described first current detection circuit with described rectification circuit, described first voltage detecting circuit, described second voltage detecting circuit respectively, described control module is used for the phase place obtaining described AC power according to the voltage of described AC power, and judge whether the phase place of described AC power meets the entry condition preset, wherein
If judge that the phase place of described AC power meets described default entry condition, described control module then controls described rectification circuit and starts working described charging device is started, and in the start-up course of described charging device, described control module controls described rectification circuit according to the phase place of the electric current of described AC power, the output voltage of described rectification circuit and described AC power.
7. the charging device for electric automobile according to claim 6, is characterized in that, described control module adopts the voltage of mode to described AC power of phase-locked loop to process the phase place obtaining described AC power.
8. the charging device for electric automobile according to claim 6 or 7, is characterized in that, as-θ
e_limit≤ θ
e≤ θ
e_limittime, described control module judges that the phase place of described AC power meets described default entry condition, wherein, and θ
efor the phase place of described AC power, θ
e_limitfor the phase boundaries of default AC power.
9. the charging device for electric automobile according to claim 6, is characterized in that, in the start-up course of described charging device, described control module adopts the direct voltage given way delayed to control described rectification circuit.
10. the charging device for electric automobile according to claim 9, is characterized in that, described control module specifically comprises:
Voltage given unit, for providing direct current given voltage;
Voltage loop PI controller, described Voltage loop PI controller is used for carrying out PI to the voltage difference between the given voltage of described direct current and the output voltage of described rectification circuit and controls to obtain the first regulated value;
Power factor correction unit, described power factor correction unit is used for obtaining given electric current according to the phase place of described first regulated value and described AC power;
Electric current loop PI controller, described electric current loop PI controller is used for carrying out to the current differential between described given electric current and the electric current of described AC power the duty ratio that PI controls to obtain described rectification circuit;
Pulse-width modulation PWM control unit, described PWM control unit is for judging whether described duty ratio is less than or equal to pre-set limit, and when judging that described duty ratio is less than or equal to described pre-set limit, increase the given voltage of described direct current by controlling described voltage given unit.
11. 1 kinds of electric automobiles, is characterized in that, comprise the charging device according to any one of claim 6-10.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105790272A (en) * | 2016-04-21 | 2016-07-20 | 武汉理工大学 | Multi-rotating coordinate phase-locked loop for electric vehicle charger and control method |
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| CN110723004A (en) * | 2018-06-29 | 2020-01-24 | 比亚迪股份有限公司 | Vehicle-mounted charger of electric vehicle, discharge control method of vehicle-mounted charger and electric vehicle |
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|---|---|
| CN105098946B (en) | 2017-10-20 |
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