KR101060781B1 - Power conversion device for charging electric vehicles with various power inputs - Google Patents

Abstract

The present invention is to provide an electric vehicle charging power converter capable of charging a battery with a variety of power sources, such as solar cell modules in addition to the commercial power source in the electric vehicle, according to the present invention step-up voltage from commercial AC power or DC power Boost circuit portion provided by; A DC-DC converter having an inverter unit for converting DC into AC, a transformer for transmitting AC power, and a rectifier circuit unit for converting AC into DC; The difference value between the output voltage of the booster circuit unit and the set reference voltage value is converted into the first frequency change amount by proportional integration, and the reference current value is obtained by multiplying the first frequency change amount by the input voltage of the power input terminal. Converts the difference value of the current value flowing through the inductor coil into the second frequency change amount by proportional integration, and determines the switching duty of the first switching element of the boosting circuit part according to the second frequency change amount to determine the first pulse width. A booster circuit controller for emitting a modulated signal; And a frequency change amount by proportionally integrating the difference value between the reference current value at which the input voltage is maximum and the final output current among the reference current values changing in the case of DC power, and switching the second switching element of the inverter unit according to the corresponding frequency change amount. Provided is an electric vehicle charging power converter including a DC-DC converter controlling the duty to emit a second pulse width modulated signal.

Electric Vehicles, Power Converters

Description

Power converter for charging electric vehicles with various power inputs {POWER CONVERTER FOR ELECTRIC VEHICLE USING VARIOUS ELECTRICAL SOURCES}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vehicle, and more particularly, to a power conversion device for charging an electric vehicle or a plug-in hybrid electric vehicle having various power inputs.

An electric vehicle, one of the future vehicles, is a vehicle that connects a power plug to a vehicle and charges a secondary battery and drives the vehicle using the charged electric energy in a general household, and a plug-in hybrid electric vehicle is Basically, it connects a power plug to a car to charge a secondary battery, drives the car by using charged electric energy, and refers to a car that can use general fossil fuel for emergency when the charged electric energy is insufficient. The plug-in hybrid vehicle is also called a grid-connected hybrid electric vehicle.

Electric vehicle charging power converter according to the prior art had a problem that it can be charged only with a commercial AC power. Therefore, when using long fossil fuels only after the consumption of rechargeable fossil fuels, there is a problem in that it is not possible to achieve eco-friendly effects such as energy efficiency and minimization of carbon emissions, which are advantages of plug-in hybrid vehicles.

Therefore, the present invention solves the problems of the prior art, the object of the present invention is to charge the battery for electric vehicles using not only a common commercial AC power supply but also a battery (battery) or direct current from a solar cell. It is to provide an electric vehicle charging power converter.

An object of the present invention, in the electric vehicle charging power converter,

A booster circuit unit having a first switching element and an inductor coil for boosting and providing a voltage from a commercial AC power source or a DC power source;

An inverter section connected to an output end of the booster circuit section and having a plurality of second switching elements for converting direct current into alternating current, a transformer connected to the inverter section to transmit AC power, and an output end of the transformer. A DC-DC converter having a rectifying circuit unit connected to convert AC into DC to supply DC power for charging the battery for the electric vehicle;

The output terminal is connected to the first switching element of the booster circuit unit, and the difference between the output voltage of the booster circuit unit and the set reference voltage value is constant to control the final output voltage output from the DC-DC converter circuit to the battery for the electric vehicle. Converts the value into a first frequency change amount by proportional integration, multiplies the first frequency change amount by an input voltage of a power input terminal to improve a power factor, obtains a reference current value, and obtains the reference current value and an inductor coil of the booster circuit part. A first pulse width modulated signal for converting the difference value of the current value flowing into the second frequency change amount by proportional integration to determine the switching duty of the first switching element of the boost circuit portion according to the second frequency change amount. Booster circuit control unit for emitting a; And

An output terminal is connected to the second switching element of the DC-DC converter, and in order to constantly control the final output voltage and the final output current output to the battery for the electric vehicle, the DC-DC current is set. Comparing the final output current and the final output voltage of the converter, proportionally integrate any one of the difference between the set reference current value and the final output current and the difference between the set reference voltage value and the final output voltage to obtain the frequency change amount and the corresponding frequency change amount. The second pulse width modulated signal for determining the switching duty of the second switching device of the inverter unit is output according to the present invention. The frequency is obtained by proportionally integrating the difference between the reference current value and the final output current at which the input voltage is maximized. An electric vehicle charging power converter according to the present invention includes a DC-DC converter for obtaining a change amount and determining a switching duty of the second switching element of the inverter unit to emit a second pulse width modulated signal according to the frequency change amount. Can be achieved by providing

In accordance with the present invention, the electric vehicle charging power converter according to the present invention connects a DC power source such as a solar cell or battery as well as a commercial AC power source to charge an electric vehicle battery (vehicle driving battery). Therefore, there is an advantage in that it is possible to maximize the economical and eco-friendly effects by increasing the efficiency of energy use by minimizing the use of fossil fuels even when traveling long distances.

The object of the present invention and the constitution and effects of the present invention to achieve the same will be more clearly understood by the following detailed description of the preferred embodiment of the present invention with reference to the accompanying drawings.

First, a circuit diagram showing a configuration of a main circuit of an electric vehicle charging power converter according to the present invention will be described with reference to FIG. 1.

The electric vehicle charging power converter according to the present invention is largely divided into a boosting circuit section (1) and a DC-DC converter (2).

 The booster circuit unit 1 has a function of correcting (improving) the power factor by creating a phase input current such as an output voltage and an input voltage, in addition to a boosting function for outputting a boosted DC voltage, which may also be called a power factor correction unit. .

The booster circuit unit 1 is connected to a power input terminal (refer to the left circuit connection terminal of the portion labeled "V_input" in FIG. 1) to boost and provide a voltage from a commercial AC power supply S1 or a DC power supply S2 or S3. In order to have the first switching element Q1 and the inductor coil (L1). In the step-up circuit unit 1, the DC power source S2 or S3 connected to the power input terminal includes a solar cell S2 and a battery S3. Here, the solar cell S2 may be composed of a solar cell that is preferably coated on a glass window of a portion including a roof of an electric vehicle.

Making an input current of a phase equal to the output voltage and the input voltage of the booster circuit unit 1 is controlled by the booster circuit controller 4 of FIG. 3 which controls the switching duty of the first switching element Q1. That is, it can be achieved by the pulse width modulated signal PWM_B output from the booster circuit controller 4.

The booster circuit unit 1 rectifies the corresponding AC to DC when the power connected through the power input terminal is a commercial AC power source S1, and turns the inductor coil L1 when the first switching element Q1 is turned off. It includes a first rectifying circuit portion (1a) constituting a freewheeling diode for improving the efficiency by flowing a current by the back electromotive force to the output side of the booster circuit portion (1).

In the boost circuit unit 1, reference numeral CT1 is a first current transformer for detecting current Ib_real flowing through an inductor coil L1, and reference numeral V_input denotes an input of a power applied to the power input terminal. Means voltage.

In step-up circuit section 1, the first switching element Q1 is connected to the anti-reverse diode in parallel, and the diode D1 also permits only current flow to the capacitor C1 side and vice versa. It is connected to the output terminal of the switching element Q1.

In FIG. 1, the capacitor C1 is a constant voltage output capacitor for constantly outputting the DC output voltage V_out of the boosting circuit unit 1 by its charging voltage.

The DC-DC converter 2 is connected to the output terminal of the booster circuit section 1, and includes an inverter section 2a, a transformer Tr, and a second rectifier circuit section 2b.

The inverter section 2a converts direct current from the booster circuit section 1 into alternating current and has a plurality of second switching elements. The second switching element may be configured of, for example, a silicon cupled rectifier (SCR), an insulated gate bipolar transistor (IGBT), or the like, which is a semiconductor switch that is turned on or turned off by gate control. . The diode connected in parallel to each of the second switching elements constituting the inverter portion 2a is a reverse protection diode for disallowing current flow flowing inverted from the output side of the inverter portion 2a to the second switching element side. Switching control of the second switching element of the inverter unit 2a is performed by controlling the DC-DC converter unit shown in FIG. 2 to control the final output voltage and the final output current which are finally output to the battery B for driving the electric vehicle ( 3), that is, by the pulse width modulated signal PWM output by the DC-DC converter 3.

The transformer Tr is connected to the inverter portion 2a to transfer AC power to the second rectifier circuit portion 2b.

The second rectifier circuit portion 2b is connected to an output terminal (ie, a secondary winding) of the transformer Tr and converts AC into direct current so as to charge the battery for the electric vehicle, that is, the battery for driving the electric vehicle B. To supply.

The electric vehicle charging power converter according to the present invention further includes a booster circuit control unit 4 as shown in FIG. 3 and a DC-DC converter unit control unit 3 as shown in FIG. 2.

First, referring mainly to FIG. 3, which is a circuit diagram showing a circuit configuration of a boosting circuit controller that outputs a pulse width modulated signal controlling a switching duty of a first switching element of a boosting circuit of the main circuit of FIG. With reference to the structure and the operation | movement of the booster circuit control part 4 are demonstrated.

The booster circuit control section 4 is connected to the output terminal of the first switching element Q1 of the booster circuit section 1 as shown in FIG. 1 and described above.

In FIG. 3, the booster circuit control unit 4 controls the booster circuit unit 1 in order to constantly control the final output voltage V_real output from the DC-DC converter circuit 2 of FIG. 1 to the battery B for the electric vehicle. ) Converts the difference value ΔV between the output voltage V_out and the set reference voltage value V_ref into the first frequency change amount Δf1 by proportional integration, and adds it to the first frequency change amount Δf1 to improve the power factor. The reference current value I_ref is obtained by multiplying the input voltage V_input of the power input terminal, and the difference value ΔI between the reference current value I_ref and the current value Ib_real flowing through the inductor coil L1 of the boost circuit unit 1. Is converted into a second frequency change amount Δf2 by proportional integration to determine a switching duty of the first switching element Q1 of the boosting circuit part 1 according to the second frequency change amount Δf2. The pulse width modulation signal PWM_B is emitted.

In FIG. 3, the booster circuit control section 4 includes a first subtracting section 4a, a second proportional integrating section 4b, a second frequency limiting section 4c, and a second mode determining section 4d. And a multiplication section 4e, a second subtracting section 4f, a third proportional integrating section 4g, a third frequency limiting section 4h and a second pulse width modulating section 4i. do.

The first subtraction unit 4a included in the boosting circuit controller 4 subtracts the output voltage V_out of the boosting circuit unit 1 from the set reference voltage value V_ref and outputs a difference value ΔV.

The second proportional integrating unit 4b proportionally integrates the difference value ΔV output from the first subtracting unit 4a and converts the difference value ΔV into a first frequency change amount Δf1.

The second frequency limiter 4c may be further configured to selectively output a signal of a predetermined frequency band Δf * by removing a high frequency or low frequency noise that may be included in the first frequency change Δf1. As a means of eliminating the high frequency noise exceeding the first predetermined frequency as the high frequency or the low frequency noise below the second predetermined frequency as the low frequency.

The second mode determiner 4d determines whether the input voltage V_input is an AC voltage or a DC voltage based on the input voltage V_input of the power input terminal of FIG. 1. For example, if there is a change in the input voltage (V_input) exceeding the preset reference value according to the time elapsed, it is determined as an AC voltage. Can be used. In addition, the second mode determiner 4d transfers the input voltage V_input from the power input terminal of FIG. 1 to the multiplier 4e. Here, the second mode determiner 4d is a circuit unit or programmatically corresponding to the first mode determiner 3a of FIG. It may be configured as a functional unit for performing the function). In the embodiment shown in FIG. 3, although it is optionally added, in the booster circuit controller 4, the second mode determiner 4d is omitted and the input voltage V_input of the power input terminal of FIG. 1 is directly multiplied. The configuration of the embodiment delivered to 4e) is also possible.

In order to improve the power factor of the booster circuit part 1 by making an input current in phase with the input voltage V_input (see Ib_real in FIG. 1), the multiplying part 4e is provided with a first frequency change amount Δf1 or a second frequency limiting part. The reference current value I_ref is obtained by multiplying the signal Δf * of the predetermined frequency band output from (4c) by the input voltage V_input of the power input terminal and outputting the reference current value I_ref.

The second subtraction section 4f subtracts the current value Ib_real flowing through the inductor coil L1 of the boosting circuit section 1 from the reference current value I_ref outputted by the multiplication section 4e, thereby giving a difference value ΔI. Get and print it.

The third proportional integrating unit 4g proportionally integrates the difference value ΔI output by the second subtracting unit 4f, converts it into a second frequency change amount Δf2, and outputs it.

The third frequency limiter 4h may be selectively further configured to output a signal f * of a predetermined frequency band by removing a high frequency or low frequency noise that may be included in the second frequency change amount Δf2. As a means of removing high frequency noise above one predetermined frequency as a high frequency or low frequency noise below another predetermined frequency as a low frequency.

The second pulse width modulator 4i is a switching frequency of the first switching element Q1 of the boosting circuit unit 1 according to the signal f * of the predetermined frequency band as the second frequency change amount Δf2. The first pulse width modulated signal PWM_B for determining s is emitted.

Next, mainly referring to FIG. 2, which is a circuit diagram showing a circuit configuration of a control unit of a DC-DC converter that emits a second pulse width modulated signal for determining a switching duty of a second switching element of an inverter of the main circuit part of FIG. 1. The configuration and operation of the DC-DC converter control unit 3 will be described with reference to the above.

In the DC-DC converter section 3, an output terminal is connected to the second switching element of the inverter section 2a in the DC-DC converter section 2 of FIG.

The DC-DC converter control unit 3 sets the reference current value I_ref and the reference voltage to control the final output voltage V_real and the final output current I_real output to the battery B for the electric vehicle constantly. The value V_ref is compared with the final output current I_real and the final output voltage V_real of the DC-DC converter 2, and the difference between the set reference current value and the final output current, the set reference voltage value, and the final output. A frequency change amount is obtained by proportionally integrating any of the difference values between voltages, and a second pulse width modulation signal PWM is determined to determine a switching duty of the second switching element of the inverter unit according to the frequency change amount.

To this end, the DC-DC converter 3 may include a first mode determiner 3a, a maximum power point tracking section 3b, and a reference as in the embodiment shown in FIG. The current and reference voltage generator 3c, the voltage and current difference value calculator 3d, the first proportional integrator 3e, the first frequency limiter 3f, and the first pulse width modulator 3g. It may be configured to include).

The first mode determination unit 3a determines whether the input voltage V_input is an AC voltage or a DC voltage based on the input voltage V_input of the power input terminal of FIG. 1. For example, if there is a change in the input voltage (V_input) exceeding the preset reference value according to the time elapsed, it is determined as an AC voltage. If there is a change in the input voltage V_input larger than a predetermined reference value with time, a method of determining the AC voltage may be used. Here, the first mode determiner 3a is a circuit part or programmatically identical to the second mode determiner 4d of FIG. It may be configured as a functional unit for performing the function).

The maximum power point tracking section 3b generates a reference current and a reference voltage to be described later if the output signal from the first mode determiner 3a determines that the input voltage V_input is an AC voltage. The reference current value I_ref from the section 3c is bypassed and output. The maximum power point tracking section 3b is a reference current and reference voltage generator if the output signal from the first mode determiner 3a determines that the input voltage V_input is a DC voltage. Based on the reference current value I_ref from (3c), the value is changed by a predetermined minute value to output the reference current value, and the reference current value I_ref_M when the input voltage V_input is maximum is found and output. . As described above, when the input power source is the solar cell S2, the maximum power point tracking unit 3b finds the reference current value I_ref_M when the input voltage V_input of the input power source is the maximum, and the DC-DC converter. Maximize the output power of (2). The maximum power point tracking section 3b finds a reference current value I_ref_M when the input voltage V_input of the input power is the maximum when the input power is the solar cell S2. It can be configured as a program with an algorithm that maximizes the output power of the DC converter 2.

The reference current and reference voltage generator 3c outputs the set reference current value I_ref and the set reference voltage value V_ref.

The voltage and current difference value calculator 3d is configured to generate a difference value between the set reference current value I_ref and the final output current I_real, the set reference voltage value V_ref and the final output voltage V_ref when the input power source is an AC power source. If any one of the difference value is output or the input power is DC power, the input voltage V_input among the reference voltage values provided by the maximum power point tracking section 3b becomes the maximum. The difference value between the reference current value I_ref_M and the final output current I_real at the time is output.

The first proportional integrating unit 3e proportionally sets any one of a difference value between the set reference current value I_ref and the final output current I_real and a difference value between the set reference voltage value V_ref and the final output voltage V_real. A frequency change amount obtained by integrating or a frequency change amount obtained by proportionally integrating a difference value between the reference current value I_ref_M and the final output current I_real when the input voltage V_input is maximum is output. Here, any one of a difference value between the set reference current value I_ref and the final output current I_real and the difference value between the set reference voltage value V_ref and the final output voltage V_real is set by the first proportional integral part 3e. In the case of proportional integration, the input voltage V_input of the input power source is an AC voltage. In the case where the first proportional integrator 3e proportionally integrates the reference current value I_ref_M when the input voltage V_input is maximum, the input voltage V_input of the input power source is a DC voltage.

The first frequency limiting section 3f is optionally further configured to remove a high frequency or low frequency noise that may be included in the frequency change amount from the first proportional integrating section 3e to output a signal of a predetermined frequency band. As a means, it is possible to remove high frequency noise exceeding a predetermined frequency as a high frequency or low frequency noise below a predetermined frequency as a low frequency.

The first pulse width modulator 3g is configured to change the frequency of the second switching element of the inverter section 2a in accordance with the frequency change amount from the first proportional integrating section 3e from which the noise is removed by the first frequency limiting section 3f. A second pulse width modulation signal PWM for determining the switching duty is emitted. Here, since the second switching device of the implementation expected inverter unit 2a includes four semiconductor switches, four signals may also be output in response to the second pulse width modulation signal PWM.

On the other hand, the operation of the electric vehicle charging power converter according to the present invention configured as described above with reference to Figures 1 to 3 as follows.

When the input power source is connected to the electric vehicle charging power converter according to the present invention as shown in FIG. 1, firstly, the first mode determination unit 3a included in the electric vehicle charging power converter according to the present invention and / Alternatively, the second mode determination unit 4d determines whether the input voltage is an AC voltage or a DC voltage. At this time, the method of determining whether the first mode determiner 3a and / or the second mode determiner 4d are an AC voltage or a DC voltage changes, for example, by changing the input voltage V_input beyond a preset reference value according to time. If there is a change in the input voltage (V_input) smaller than the preset reference value even if the time elapses, if the input voltage (V_input) is greater than the preset reference value according to the elapsed time, change to the AC voltage. Determination methods can be used.

Referring to FIG. 1, when an input power source is connected to a power input terminal of the booster circuit unit 1, when the first rectifier circuit unit 1a of the booster circuit unit 1 is a commercial AC power source S1, the corresponding AC Is rectified and outputted by DC, and the freewheeling diode of the first rectifying circuit unit 1a receives the current caused by the counter electromotive force of the inductor coil L1 when the first switching element Q1 is turned off. ) To the output side to increase the efficiency.

The DC voltage output from the first rectifying circuit unit 1a is output voltage V_output stepped up by the step-up voltage induced by the inductor coil L1 according to the turn-on and turn-off switching of the first switching element Q1. Is output.

In this case, the switching duty of the first switching element Q1 is controlled by the first pulse width modulation signal PWM_B, which is the final output signal of the booster circuit controller 4 of FIG. 3.

A process of generating the first pulse width modulated signal PWM_B will be described with reference to FIG. 3.

The first subtracting section 4a included in the boosting circuit control section 4 detects the output voltage V_out of the boosting circuit section 1 by a voltage detecting means such as a voltage transformer (not shown) from the set reference voltage value V_ref. ) Is subtracted to output the difference value ΔV.

The second proportional integrating unit 4b proportionally integrates the difference value ΔV output from the first subtracting unit 4a and converts the difference value ΔV into a first frequency change amount Δf1.

The second frequency limiter 4c removes a high frequency or low frequency noise that may be included in the first frequency change amount Δf1 and outputs a signal Δf * of a predetermined frequency band.

The second mode determiner 4d transfers the input voltage V_input from the power input terminal of FIG. 1 to the multiplier 4e.

In order to improve the power factor of the booster circuit part 1 by making an input current in phase with the input voltage V_input (see Ib_real in FIG. 1), the multiplying part 4e is provided with a first frequency change amount Δf1 or a second frequency limiting part. The reference current value I_ref is obtained by multiplying the signal Δf * of the predetermined frequency band output from (4c) by the input voltage V_input of the power input terminal and outputting the reference current value I_ref.

The second subtraction section 4f subtracts the current value Ib_real flowing through the inductor coil L1 of the boosting circuit section 1 from the reference current value I_ref outputted by the multiplication section 4e, thereby giving a difference value ΔI. Get and print it.

The third proportional integrating unit 4g proportionally integrates the difference value ΔI output by the second subtracting unit 4f, converts it into a second frequency change amount Δf2, and outputs it.

The third frequency limiter 4h removes a high frequency or low frequency noise that may be included in the second frequency change Δf2 and outputs a signal f * of a predetermined frequency band.

The second pulse width modulator 4i is a switching frequency of the first switching element Q1 of the boosting circuit unit 1 according to the signal f * of the predetermined frequency band as the second frequency change amount Δf2. The first pulse width modulated signal PWM_B for determining s is emitted.

1 again, the DC output voltage V_output is smoothed by the capacitor C1 and supplied to the inverter unit 2a at a constant voltage.

The inverter unit 2a converts the DC current supplied smoothed by the capacitor C1 into an AC current. At this time, the switching duty for the DC-AC conversion of the switching elements constituting the inverter unit 2a is controlled by the DC-DC converter unit 3 of FIG. 2.

Referring to FIG. 2, a process of generating a second pulse width modulated signal PWM, which is a control output of the DC-DC converter 3, will be described.

If the input power is a commercial AC power supply S1, the difference value or reference between the reference current I_ref and the final output current I_real (detected by the second current transformer CT2) output from the reference current and reference voltage generator 3c. The difference value between the voltage V_ref and the final output voltage V_real (detected by a voltage detecting means such as a voltage transformer) is proportionally integrated by the first proportional integration section 3e to obtain a frequency. Next, while limiting the obtained frequency to a frequency band predetermined by the first frequency limiting section 3f, the first pulse width modulating section 3g issues a pulse width modulating signal PWM according to the corresponding frequency. The switching elements in the inverter section 2a of the DC-DC converter 2 are controlled by the pulse width modulated signal PWM. In summary, if the input power source is an AC power source, the DC-DC converter 2 is controlled in accordance with the reference current I_ref and the reference voltage V_ref output from the reference current and the reference voltage generator 3c.

When the input voltage is a direct current power source (solar cell S2 or battery S3), the first mode determination unit 3a uses the input voltage V_input based on the input voltage V_input of the power input terminal of FIG. It is determined that this is a DC voltage.

The reference current and reference voltage generator 3c outputs the set reference current value I_ref and the set reference voltage value V_ref.

The maximum power point tracking section 3b is a reference current and reference voltage generator if the output signal from the first mode determiner 3a determines that the input voltage V_input is an AC voltage. The reference current value I_ref from (3c) is bypassed and output. The maximum power point tracking section 3b is a reference current and reference voltage generator if the output signal from the first mode determiner 3a determines that the input voltage V_input is a DC voltage. Based on the reference current value I_ref from (3c), the value is changed by a predetermined minute value to output the reference current value, and the reference current value I_ref_M when the input voltage V_input is maximum is found and output. . As described above, when the input power source is the solar cell S2, the maximum power point tracking unit 3b finds the reference current value I_ref_M when the input voltage V_input of the input power source is the maximum, and the DC-DC converter. Maximize the output power of (2).

The voltage and current difference value calculator 3d is configured to generate a difference value between the set reference current value I_ref and the final output current I_real, the set reference voltage value V_ref and the final output voltage V_ref when the input power source is an AC power source. If any one of the difference value is output or the input power is DC power, the input voltage V_input among the reference voltage values provided by the maximum power point tracking section 3b becomes the maximum. The difference value between the reference current value I_ref_M and the final output current I_real at the time is output.

The first proportional integrating unit 3e outputs a frequency variation obtained by proportionally integrating the difference value between the reference current value I_ref_M and the final output current I_real when the input voltage V_input is maximum.

The first frequency limiting section 3f removes the high frequency or low frequency noise that may be included in the frequency change amount from the first proportional integrating section 3e and outputs a signal of a predetermined frequency band.

The first pulse width modulator 3g is configured to change the frequency of the second switching element of the inverter section 2a in accordance with the frequency change amount from the first proportional integrating section 3e from which the noise is removed by the first frequency limiting section 3f. A second pulse width modulation signal PWM for determining the switching duty is emitted.

Again, returning to FIG. 1, the AC power which has been DC-AC converted by the inverter unit 2a afterwards is connected to the transformer Tr by the inverter unit 2a to transfer the AC power to the second rectifying circuit unit 2b.

The second rectifier circuit portion 2b is connected to an output terminal (ie, a secondary winding) of the transformer Tr and converts AC into direct current so as to charge the battery for the electric vehicle, that is, the battery for driving the electric vehicle B. To supply. Therefore, the electric vehicle can be driven using a DC power charged in the battery B for driving the electric vehicle.

As described above, according to the present invention, it is possible to charge a battery for an electric vehicle (vehicle driving battery) by connecting a DC power source such as a solar cell or a battery as well as a commercial AC power source. In addition, by minimizing the use of fossil fuels, the efficiency of energy use can be enhanced to maximize economic and environmentally friendly effects.

1 is a circuit diagram showing the configuration of the main circuit of the electric vehicle charging power conversion apparatus according to the present invention,

FIG. 2 is a circuit diagram illustrating a circuit configuration of a DC-DC converter controlling a second pulse width modulated signal for determining a switching duty of a second switching element of the inverter unit in the DC-DC converter controlling part of the main circuit part of FIG. 1. ,

FIG. 3 is a circuit diagram illustrating a circuit configuration of a boost circuit controller for outputting a pulse width modulated signal for controlling a switching duty of a first switching element of a boost circuit of the main circuit unit of FIG. 1.

* Explanation of symbols on the main parts of the drawings

1: booster circuit portion 1a: first rectifier circuit portion

2: DC-DC converter 2a: inverter unit

2b: 2nd rectifier circuit part 3: DC-DC conversion part control part

3a: first mode determining unit 3b: maximum power point tracking unit

3c: reference current and reference voltage generator

3d: voltage and current difference calculator

3e: first proportional integral part 3f: first frequency limiting part

3g: first pulse width modulator 4: booster circuit controller

4a: first subtraction part 4b: second proportional integral part

4c: second frequency limiter 4d: second mode determiner

4e: multiplication part 4f: second subtraction part

4g: third proportional integral section 4h: third frequency limiting section

4i: second pulse width modulator S1: commercial AC power supply

S2: solar cell S3: battery

Claims (10)

In the electric vehicle charging power converter, A booster circuit unit connected to a power input terminal for boosting and providing a voltage from a commercial AC power source or a DC power source; A DC-DC converter connected to an output terminal of the booster circuit unit, the inverter unit converting direct current into alternating current, and a rectifying circuit unit converting alternating current into direct current and supplying a direct current power source for charging an electric vehicle battery; A booster circuit controller connected to an output terminal of the booster circuit unit and outputting a first pulse width modulation signal for determining a switching duty of the switching element of the booster circuit unit; A mode determination unit which determines whether the input power is AC power or DC power based on the input voltage of the power input terminal; And When the output terminal is connected to the DC-DC converter and the mode determiner determines that the input power is AC power, the set reference current value and the reference voltage value are compared with the final output current and the final output voltage of the DC-DC converter. The frequency change amount is obtained by proportionally integrating any one of the difference between the set reference current value and the final output current and the difference between the set reference voltage value and the final output voltage. A frequency change obtained by proportionally integrating the difference between the reference current value and the final output current at the maximum value, and a direct current generating a second pulse width modulated signal for determining the switching duty of the switching element of the inverter according to the frequency change amount. A direct current control unit; Electric vehicle charging power converter comprising a. delete The method of claim 1, DC power supplied to the power input terminal connected to the booster circuit unit is an electric vehicle charging power converter, characterized in that consisting of a solar cell (cell). The method of claim 3, The solar cell, Electric vehicle charging power converter, characterized in that the solar cell is coated on the glass window of the portion including the roof of the electric vehicle. The method of claim 1, The electric power charging device for charging an electric vehicle, characterized in that the DC power supplied to the power input terminal connected to the booster circuit unit is composed of a battery. In the electric vehicle charging power converter, A booster circuit unit having a first switching element and an inductor coil for boosting and providing a voltage from a commercial AC power source or a DC power source; An inverter section connected to an output end of the booster circuit section and having a plurality of second switching elements for converting direct current into alternating current, a transformer connected to the inverter section to transmit AC power, and an output end of the transformer. A DC-DC converter having a rectifying circuit unit connected to convert AC into DC to supply DC power for charging the battery for the electric vehicle; The output terminal is connected to the first switching element of the booster circuit unit, and the difference between the output voltage of the booster circuit unit and the set reference voltage value is constant to control the final output voltage output from the DC-DC converter circuit to the battery for the electric vehicle. Converts the value into a first frequency change amount by proportional integration, multiplies the first frequency change amount by an input voltage of a power input terminal to improve a power factor, obtains a reference current value, and obtains the reference current value and an inductor coil of the booster circuit part. A first pulse width modulated signal for converting the difference value of the current value flowing into the second frequency change amount by proportional integration to determine the switching duty of the first switching element of the boost circuit portion according to the second frequency change amount. Booster circuit control unit for emitting a; And An output terminal is connected to the second switching element of the DC-DC converter, and the set reference current value and the final output of the DC-DC converter are constant to control the final output voltage and the final output current output to the battery for the electric vehicle. Comparing the current and comparing the reference voltage value and the final output voltage of the DC-DC converter, proportionally integrate any one of a difference value between the set reference current value and the final output current and a difference value between the set reference voltage value and the final output voltage. To obtain a frequency change amount, determine a switching duty of the second switching element of the inverter unit according to the frequency change amount, and emit a second pulse width modulation signal, and determine whether or not a DC power source is determined based on the input voltage of the power input terminal. In the case of power supply, the reference current value when the input voltage becomes maximum among the reference current values that change, and before the final output The frequency change amount is obtained by proportionally integrating the difference values, and when the input power source is an AC power source, the set reference current value and the reference voltage value are compared with the final output current and the final output voltage of the DC-DC converter, A frequency change amount is obtained by proportionally integrating any one of a difference value between a final output current and a difference value between the set reference voltage value and the final output voltage, and determines a switching duty of the second switching element of the inverter unit according to the corresponding frequency change amount. Electric vehicle charging power converter including a; DC-DC converter for outputting a pulse width modulation signal. The method of claim 6, The boost circuit control unit, A first subtractor configured to subtract an output voltage of the booster circuit part from a set reference voltage value to output a difference value; A first proportional integrator for proportionally integrating the difference value output from the first subtractor to convert the difference value into a first frequency change amount; A multiplier for multiplying the first frequency change by an input voltage of a power input terminal to obtain a reference current value and output the reference current value; A second subtractor configured to subtract a current value flowing through the inductor coil of the booster circuit part from a reference current value output by the multiplier part to obtain a difference value and output the difference value; A second proportional integrator that proportionally integrates the difference value output by the second subtractor and converts the difference value into a second frequency change amount; And A pulse width modulator for outputting a pulse width modulated signal for determining a switching duty of the first switching element Q1 of the boost circuit unit 1 according to the second frequency change amount; Electric vehicle charging power converter, characterized in that comprises a. The method of claim 7, wherein And a frequency limiting unit connected between the first proportional integrator and the multiplier and between the second proportional integrator and the pulse width modulator, respectively, to limit the frequency signal to a signal of a predetermined frequency band. Power converter for car charging. The method of claim 6, The DC-DC converter control unit, A first mode determiner configured to determine whether an input voltage is an AC voltage or a DC voltage based on an input voltage of a power input terminal; A reference current and reference voltage generator for outputting a set reference current value and a set reference voltage value; If the output signal from the first mode determiner determines that the input voltage is AC voltage, the reference current and the reference current value from the reference voltage generator are output, and the output signal from the first mode determiner is the DC voltage. If the voltage is determined to be a voltage, the reference current value is output by changing the value by a predetermined small value based on the reference current and the reference current value from the reference voltage generator, and the reference current value when the input voltage is maximum is found. Outputting a maximum power point tracking section; When the input power is AC power, any one of a difference value between the set reference current value and the final output current and a difference value between the set reference voltage value and the final output voltage is output. When the input power is DC power, the maximum power point tracking unit A voltage and current difference value calculation unit for outputting a difference value between the reference current and the final output current when the input voltage becomes maximum among the changing reference current values to be provided; When the input power source is AC power, outputs the frequency change obtained by proportionally integrating one of the difference between the set reference current value and the final output current and the difference between the set reference voltage value and the final output voltage. A proportional integrating unit for outputting a frequency change obtained by proportionally integrating a difference value between a reference current value and a final output current when the input voltage is maximum; And And a pulse width modulator for outputting a pulse width modulated signal for determining a switching duty of the switching device of the inverter unit according to the frequency change amount from the proportional integral unit. 10. The method of claim 9, And a frequency limiting unit connected between the proportional integrating unit and the pulse width modulation unit to limit a frequency signal to a signal of a predetermined frequency band.

Images