JP2003134804A - Input power following type converting circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an input power following type converting circuit capable of supplying electric power stably, without needing additional battery and the like, even when output power from a power source is unstable. SOLUTION: This input power following type converting circuit 1 includes a boosting circuit 12, which is connected to a generator 2 for boosting input voltage to a predetermined voltage and outputs it, in response to drive and control signals; current-limiting signal-generating means 13, A1 that generate a current-limiting signal that indicates a limit value of the input current to the boosting circuit, which corresponds to the difference between the input voltage and a preset operation start voltage of the boosting circuit; current and voltage control means 14, 15, A1 to A5, R1 to R3 that receive the output voltage of the boosting circuit and the input voltage, to make the output voltage follow an output reference voltage targeted, and that generate drive and control signals for making the input current follow the limit value indicated by the current-limiting signal to supply the signals to the boosting circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input power tracking conversion circuit, and more particularly to an input power tracking conversion circuit which is effective when connected to an unstable power source such as a wind power generator.

[0002]

2. Description of the Related Art In this kind of input power tracking type conversion circuit,
MPPT (maximum power tracking method) is adopted to stably supply the output power, and the input voltage exceeds a predetermined reference value and a large starting current is required as the operation start condition. For this reason, when a power source with unstable output power, such as a wind power generator, is used, most of the generated power is consumed for startup, and conversion to a usable power source is sufficient. Sometimes it was not done. Hereinafter, this problem will be described with reference to the drawings.

FIG. 3 is a block diagram of a conventional conversion circuit.
As shown in FIG. 3, in the conventional conversion circuit 4, a DC generator 2 for wind power generation, for example, is connected to the input terminal RX as a power source. Further, the output terminal TX is connected to an inverter circuit 3 that converts, for example, a DC signal into an AC signal and supplies the AC signal to a system power supply or the like.

The conventional conversion circuit 4 is a current detection circuit 4
1, DC / DC converter 42, input voltage monitoring circuit 4
3, an oscillator 44, a PWM comparator 45, a gate protection circuit 46, and amplifiers A41 and A42.

The current detection circuit 41 includes a current transformer and the like, and
The input current to the C / DC converter 42 is detected and supplied as an input feedback current If to the error amplifier A42. DC
The / DC converter 42 includes a reactor L and a diode D.
1, a boost converter including a capacitor C and a switching element S, and an input voltage Vin of, for example, 20
The voltage is boosted to a constant voltage of about 0V. Input voltage monitoring circuit 43
Compares the input voltage Vin of the DC / DC converter 42 with a preset operation start voltage Vs of the DC / DC converter 42, and controls the gate protection circuit 46 based on the comparison result. The error amplifier A41 is an amplifier that compares the output voltage Vf with the output reference voltage Vr and outputs the comparison result. The error amplifier A42 has the input feedback current If
Of the input current reference value Ifr and outputs the comparison result.

In such a structure, when the input voltage monitoring circuit 43 detects that the input voltage Vin has reached the operation start voltage Vs after the start of operation of the DC generator 2, the gate protection circuit 46 is controlled. The PWM comparator 4
The pulse output from the switching element S of the conversion circuit 4
Controlled to supply. At this time, the output voltage Vf of the DC / DC converter 42 is fed back to the amplifier A41.
The output reference voltage Vr supplied to one of the input terminals and supplied to the other input terminal is compared. Also, DC / DC
The input current of the converter 42 is also supplied to the one input terminal of the amplifier A42 as the input feedback current If and is compared with the input current reference value Ir supplied to the other input terminal. The comparison outputs of the amplifiers A41 and A42 are combined and supplied to one input terminal of the PWM comparator. Then, as described above, when the input voltage monitoring circuit 43 detects that the input voltage Vin has reached the operation start voltage Vs, the gate protection circuit 46 is controlled to control the PW.
The M comparator 45 compares the combined signal with the reference triangular wave from the oscillator, generates a PWM pulse as the comparison output, and supplies the PWM pulse to the switching element S of the DC / DC converter 42.

In such control, especially after the start of operation of the DC generator 2, that is, the DC / DC converter 4
At the start of the operation of No. 2, since the terminal voltage of the capacitor C is raised to a predetermined output setting voltage, the capacitor C is charged. That is, after the start of this operation, the input current is fixedly set to a value corresponding to the input current reference value Ifr so that the electric power to be taken in can be largely changed intentionally, and based on this, the operation start is started. The power is taken in later.

The respective operations when a general synchronous generator and a wind power generator are applied to the conventional conversion circuit 4 which takes in such electric power will be described with reference to FIGS. 4 and 5.

4 (A), (B), (C) and (D) respectively show input power by the conventional conversion circuit of FIG. 3 when a general synchronous generator is used as the DC generator 2.
It is a time chart which shows an input voltage, an input current, and an output voltage.

It is assumed that the input power to the input terminal RX changes as shown in FIG. 4 (A) after the DC generator 2 starts operating. In this case, the input voltage Vin is as shown in FIG.
As shown in, the DC generator 2 rises after starting operation and reaches the operation start voltage Vs at time t1. Then, the input voltage monitoring circuit 43 detects this and controls the gate protection circuit 46 to supply the PWM pulse from the PWM comparator 45 to the switching element S of the DC / DC converter 42. At this time, as described above, in order to raise the terminal voltage of the capacitor C to the output setting voltage,
PW to change the electric power to be taken
The M pulse is supplied to the switching element S. As a result, as shown from time t1 to time t99 in FIG.
An input current having the maximum input current value Imax (corresponding to the input current reference value Ifr) flows.

Then, at time t99, the output voltage V
When the fact that f has reached 200V indicated by the output reference voltage Vr is detected by the comparison by the error amplifier A41, the output from the PWM comparator 45 is controlled,
The PWM pulse is supplied to the switching element S of the DC / DC converter 42 so that the capturing of the large current at the rising time, which is shown between times t1 and t99 in FIG. 4C, is stopped. After this, as shown in FIG. 4 (D), the output voltage Vf of 200V is constantly increased by the DC / DC converter 4
The PWM pulse is supplied to the switching element S so that the switching element S outputs the PWM pulse.

That is, when a general synchronous generator is used as the DC generator 2, the output voltage of the synchronous generator is kept constant by field control or the like. The output voltage of the synchronous generator, that is, the input voltage of the conventional conversion circuit 4 as shown in FIG. 4B does not fluctuate in an unstable manner. Therefore,
In this case, the above-mentioned problem does not occur even in the conventional conversion circuit 4.

[0013]

On the other hand, FIG. 5 (A),
(B), (C) and (D) are time charts showing the input power, the input voltage, the input current and the output voltage by the conventional conversion circuit of FIG. 3 when the wind power generator is used as the DC generator 2. Is.

Here, it is assumed that the input power to the input terminal RX changes as shown in FIG. 5 (A) after the operation of the DC generator 2 is started, as in FIG. 4 (A). in this case,
As shown in FIG. 5 (B), the input voltage Vin rises after the DC generator 2 starts operating, and the operation start voltage V increases at time t1.
reach s. Then, the input voltage monitoring circuit 43 detects this and controls the gate protection circuit 46 to perform PWM.
The PWM pulse from the comparator 45 is supplied to the switching element S of the DC / DC converter 42. At this time,
As described above, in order to raise the terminal voltage of the capacitor C to the output setting voltage, the PWM pulse changes the switching element S so that the electric power to be taken in can be varied largely.
Is supplied to.

As a result, the input current is the maximum input current value Im as shown at times t1 to t11 in FIG. 5 (C).
Since the input current of ax rapidly flows, the input voltage Vin
Decreases as shown at times t1 to t11 in FIG. 5B and becomes smaller than the converter stop voltage Ve. That is, since the wind power generator does not have the output voltage stabilizing function such as the field control performed by the synchronous generator described above,
The output terminal voltage, that is, the input voltage of the conversion circuit 4 as shown in FIG. 5B varies according to V (voltage) = P (power) / I (current).

When the input voltage Vin becomes smaller than the converter stop voltage Ve as shown at time t11,
Since the input current no longer flows, the input voltage Vin starts increasing. Then, the input voltage V
In reaches the operation start voltage Vs again at time t2, and as a result, the input current having the maximum input current value Imax flows again. However, at this time, in t1 to t11, the electric charge taken into the capacitor C is already discharged. Then, from time t2 to t21 in FIG.
As shown in, again, the maximum input current value Imax is changed from zero.
Input current Vin rapidly decreases, the input voltage Vin decreases again, and the input voltage Vin becomes smaller than the converter stop voltage. That is, such a phenomenon occurs at time t3.
The same process is repeated at times t31, t4 to t41, and t5 to t51. Note that FIG. 5D
For comparison, the broken line shown in FIG. 4 indicates the output voltage characteristic of FIG.

As a result of such repetition, the output voltage Vf from the DC / DC converter 42 repeatedly rises and falls, as shown in FIG. 5D, and the output reference voltage Vr.
Can't reach. That is, when a wind power generator is used as the DC generator 2, most of the power generated by the DC generator 2 is consumed to capture the current at the time of start-up, and therefore conversion to a usable power source is sufficient. Will not be done.

In order to solve the above problems, for example, as shown in FIG. 3, a storage battery or the like is connected to the DC generator 2 and the DC generator 2.
It is necessary to additionally connect it to the / DC converter 42 to measure the stability. Then, daily maintenance of the storage battery,
The inspection work will be forced. Especially when a general lead storage battery is used as an additional battery, the constituent materials include dilute sulfuric acid and harmful substances such as lead, and since it has a longer life, it is necessary to perform maintenance such as regular replacement. . Further, since the storage battery is large and heavy, there are many problems such as restrictions on the installation location and cost.

Therefore, in view of the above-mentioned present situation, the present invention does not require an additional battery or the like and can supply stable power even if the output power from the power source is unstable. The challenge is to provide.

[0020]

An input power tracking type conversion circuit according to claim 1, which is made in order to solve the above-mentioned problems, comprises:
A difference between the booster circuit 12 that is connected to the generator 2 and boosts the input voltage to a predetermined voltage in response to the drive control signal and outputs the boosted voltage, and the preset operation start voltage of the booster circuit. And current limiting signal generating means 13, A1 for generating a current limiting signal indicating the limiting value of the input current to the booster circuit, and the output voltage of the booster circuit based on the output voltage and the input current. Current control means 14 and 15 for generating the drive control signal for causing the input current to follow the limit value indicated by the current limit signal and supplying the booster circuit with the output reference voltage. , A1 to A5, and R1 to R3 are included.

According to the first aspect of the present invention, the output voltage of the booster circuit is controlled so as to follow the target output reference voltage, and the input current of the booster circuit is the input voltage and the operation start voltage. Limited to the value corresponding to the difference. As a result, with respect to the power variation characteristic as shown in FIG. 2A, for example, after the start of activation, the input voltage does not fall below the operation start voltage after exceeding the operation start voltage. That is, unlike the conventional case, it is possible to prevent the operation of the booster circuit from being stopped due to the rapid increase in the startup current due to the rapid power intake immediately after the startup.

According to another aspect of the present invention, there is provided an input power tracking conversion circuit according to claim 1, wherein the current limiting signal generating means includes the input voltage and the input voltage. An error amplifier A1 that generates an input current reference value based on a difference from the operation start voltage, and a current minor loop 13 that generates the current limit signal so as to follow the input current reference value are included. To do.

According to the second aspect of the present invention, the error amplifier generates the input current reference value based on the difference between the input voltage and the operation start voltage, and the current minor loop uses the current limit signal as the current limit signal. Is controlled so that the current limit signal can be generated very stably.

According to another aspect of the present invention, there is provided an input power tracking conversion circuit according to claim 2, wherein the current voltage control circuit outputs the output voltage. If the voltage is lower than the reference voltage, the drive control signal is generated, and if not, the drive control signal is stopped.

According to the third aspect of the present invention, the drive control signal is generated when the output voltage is smaller than the output reference voltage, and otherwise the drive control signal is stopped. It is possible to make the output voltage follow the output reference voltage with certain control.

According to another aspect of the present invention, there is provided an input power tracking type conversion circuit according to claim 3, wherein the current / voltage control circuit outputs the drive control signal. P to generate PWM pulse
It is characterized by including a WM comparator 15 and an oscillator 14.

According to the fourth aspect of the invention, since the PWM comparator and the oscillator are included to generate the PWM pulse as the drive control signal for the booster circuit, the follow-up control of the input current and the output voltage of the booster circuit can be performed. It can be done more accurately.

The input power tracking conversion circuit according to claim 5 made in order to solve the above-mentioned problems is the input power tracking conversion circuit according to claim 4, wherein the generator outputs a DC signal by wind power generation. And a step-up circuit that is a DC / DC converter 12 connected to the DC generator.

According to the fifth aspect of the present invention, the DC signal output from the wind power generation is DC / DC as a booster circuit.
The converter 12 boosts the voltage. In other words, since wind power generation as a generator uses natural energy,
Unlike fossil fuels, which have the great advantage of not causing pollution or consumption of natural resources, it is difficult to expect a constant start-up and stable power generation, so the problem shown in FIG. 5 tends to occur. According to the present invention, this problem is solved as described above, and the advantages of wind power generation can be fully enjoyed.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing an embodiment of an input power tracking conversion circuit of the present invention.

As shown in FIG. 1, the input power tracking conversion circuit 1 has an input terminal RX to which a DC generator 2 for wind power generation is connected as an input source. Further, the output terminal TX is connected to, for example, an inverter circuit 3 that converts a DC signal into an AC signal and supplies the AC signal to a system power supply or the like. The input power tracking conversion circuit 1 includes a current detection circuit 11, a DC / DC converter 12, an oscillator 14, a PWM comparator 15, and error amplifiers A1 to A1.
A5, resistors R1 to R3, and a diode D2 are included. In particular, the error amplifiers A2, A3, A4 and the resistor R
3 and the diode D2 form a current minor loop 13 described later.

The current detection circuit 11 is composed of, for example, a known current transformer using a Hall element, detects the input current to the DC / DC converter 12, and inputs the input feedback current I.
It is supplied to the error amplifier A5 as f. The DC / DC converter 12 includes a reactor L, a diode D1, a capacitor C, and a switching element S, and is a known boost type D.
The C / DC converter 12 boosts the input voltage Vin to, for example, about 200 V and outputs the boosted voltage. This DC / D
The PWM pulse supplied to the switching element S of the C converter 12 (corresponding to the drive control signal in claim 1)
This controls the input current and output voltage.

The error amplifier A1 is an inverting / proportional control type amplifier which generates the input current reference value Ir based on the difference between the input voltage Vin and the preset operation start voltage Vs of the DC / DC converter 12. The error amplifier A2 is
It is an inverting and proportional-plus-integral control type voltage control error amplifier. The error amplifier A3 is an inverting, proportional control type amplifier that performs level conversion for comparing the current limiting signal Ilim which is the output signal from the error amplifier A2 with the input current reference value Ir. The error amplifier A4 is an inverting, high amplification factor type amplifier that compares the level-converted current limiting signal Ilim with the input current reference value Ir which is the output signal of the error amplifier A1 and outputs a comparison result. The error amplifier A5 is a current control error amplifier that compares the input current with the current limit signal Ilim and outputs the comparison result.

In particular, the error amplifiers A2, A3, A4,
In the current minor loop 13 including the resistor R3 and the diode D2, the value of the current limiting signal Ilim supplied to the error amplifier A5 is controlled so as to follow the input current reference value Ir. In this way, the current minor loop 13 controls so that the value of the current limit signal Ilim follows the input current reference value Ir, so that the current limit signal can be generated very stably.

The PWM comparator 15 includes an error amplifier A
5 is compared with the reference triangular wave from the oscillator 14 to generate a PWM pulse, which is a comparison output, to generate a DC pulse.
It is supplied to the switching element S of the / DC converter 12. Thus, by using the PWM pulse, D
The tracking control of the input current and the output voltage Vf of the C / DC converter 12 can be performed more accurately.

In such a configuration, the input power tracking type conversion circuit 1 basically includes the DC / DC included therein.
Based on the input current and input voltage Vin of the converter 12 and the output voltage Vf of the DC / DC converter 12, a PWM pulse supplied to the DC / DC converter 12 changes the output voltage Vf to a target output reference voltage Vr. It has an action of controlling so as to follow, and also has an action of limiting the input current to a value matching the input voltage Vin.

This operation will be described in more detail with reference to FIG. 2A, 2B, 2C, and 2D are input power and input voltage by the input power tracking conversion circuit shown in FIG. 1 when a wind power generator is used as the DC generator 2, respectively. 3 is a time chart showing an input current and an output voltage. 2 (A), (B), (C) and (D) are respectively the above-mentioned FIG. 5 (A), (B), (C).
And (D).

After the DC generator 2 starts operating, the input power is
It is assumed to change as shown in FIG. After the DC generator 2 starts operating, the input voltage Vin of the DC / DC converter 12 is compared with the preset operation start voltage Vs of the DC / DC converter 12 by the error amplifier A1. For example, as shown in FIG. 2B, at time t1, when the input voltage Vin becomes higher than the operation start voltage Vs, the error amplifier A1 generates the input current reference value Ir based on the difference between the two voltages as the comparison result. And output. The input current reference value Ir is, for example, that the input voltage Vin is lower than the operation start voltage Vs as shown after time t1 in FIG. 2B with respect to the variation characteristic of the input power shown in FIG. This is a reference value for limiting the input current so that there is no. Further, the input current reference value Ir output from the error amplifier A1 changes depending on the input voltage Vin.

The input current reference value Ir is input to the current minor loop 13. This current minor loop 13
Then, as described above, the value of the current limiting signal Ilim supplied to the error amplifier A5 is controlled so as to follow the input current reference value Ir. The operation related to this current minor loop will be described below.

That is, the output voltage Vf is the output reference voltage V
If it is smaller than the absolute value of r, step (a): The current limiting signal Ilim increases toward the maximum value in the positive direction, and the value of the current limiting signal Ilim is equal to the current input voltage Vin. Reference value I
When it becomes larger than r, the output of the error amplifier A4 becomes positive, and the addition point of the error amplifier A2 also becomes positive. At the above-mentioned addition point, although not shown here, the current flowing through the resistors R1 to R3 is added by using an addition circuit using an operational amplifier or the like. Step (b): As a result, the current limit signal Ilim, which is the output of the error amplifier A2, starts to decrease. Then, when the value of the current limit signal Ilim becomes smaller than the input current reference value Ir, the output of the error amplifier A2 becomes negative and the state returns to the state of the step (a). Step (c): And finally, the current limit signal Il
The value of im is balanced in the same state as the input current reference value Ir and is supplied to the error amplifier A5.

On the other hand, when the output voltage Vf is larger than the absolute value of the output reference voltage Vr, the value of the current limiting signal Ilim becomes negative regardless of the state of the error amplifier A4, and the PWM
The generation of the PWM pulse signal by the comparator 15 is stopped. Therefore, the output voltage Vf also drops, and the output voltage Vf finally becomes smaller than the absolute value of the output reference voltage Vr. Then, the same control as in steps (a) to (c) is performed, and the current limiting signal Ilim having a value equal to the input current reference value Ir is supplied to the error amplifier A5.

As described above, the PWM pulse signal is generated when the output voltage Vf is smaller than the output reference voltage Vr, and otherwise the generation of the PWM pulse signal is stopped. Output voltage V
It becomes possible to make f follow the output reference voltage Vr.

The error amplifier A5 receives the current limiting signal Ilim, that is, the input current reference value Ir,
An output signal in which the input current is limited by a value corresponding to the input current reference value Ir is output to the PWM comparator 15, and the PWM comparator 15 compares the output signal of the error amplifier A5 with the reference triangular wave from the oscillator 14, A PWM pulse that is a comparison output is generated to generate the DC / DC converter 12
To the switching element S. As a result,
As shown between times t1 and t99 in (C), DC / DC
The input current of the converter 12 is limited according to the input current reference value Ir. Further, as shown in FIG. 2D, the output voltage Vf of the DC / DC converter 12 is also controlled so as to follow the above-mentioned output reference voltage Vr.

Here, when the input source impedance is low, the time period from t1 to t99 is short, and when the input source impedance is high, the time period from t1 to t99 is long. However, in any case, since the input current is limited as described above, the output voltage does not fluctuate as shown in FIG. 5 (D). For comparison, FIG.
The broken line in (C) shows the maximum input current value Imax shown in FIGS. 4 (C) and 5 (C), and the broken line in FIG. 2 (D) shows the output voltage characteristics in FIG. 4 (D).

As described above, according to this embodiment, the DC
The output voltage Vf of the / DC converter 12 is controlled so as to follow the target output reference voltage Vr, and DC
The input current of the / DC converter 12 is limited to a value corresponding to the difference between the input voltage Vin and the operation start voltage Vs.
As a result, as in the conventional case, DC / D
The operation stop of the C converter 12 is prevented. As a result,
Useless consumption of generated power at startup is suppressed. Further, a lead storage battery or the like as an auxiliary power source is unnecessary.

Further, since the present embodiment is effective for compensating the instability of the output power Vf from the power source, this embodiment is effective for natural energy power generation and the like, but in particular, the minimum generated power and the minimum terminal voltage are guaranteed. It is considered to be most effective when applied to a small wind power generation system. In addition, DC /
By connecting an inverter circuit, which converts a DC signal into an AC signal and supplies it to a system power supply, to the output terminal of the DC converter 12, not only the DC power supply but also the AC power supply can be supplied, and the application range is further widened. .

[0047]

As described above, according to the first aspect of the invention, the output voltage of the booster circuit is controlled so as to follow the target output reference voltage, and the input current of the booster circuit is It is limited to a value corresponding to the difference between the input voltage and the operation start voltage. As a result, with respect to the power variation characteristic as shown in FIG. 2A, for example, the input voltage does not fall below the operation start voltage Vs after the start of the start after the operation start voltage Vs. That is, unlike the conventional case, it is possible to prevent the operation of the booster circuit from being stopped due to the rapid increase in the startup current due to the rapid power intake immediately after the startup. As a result, useless consumption of generated power at the time of startup is suppressed. Further, a lead storage battery or the like as an auxiliary power source is unnecessary.

According to the second aspect of the present invention, the error amplifier generates the input current reference value based on the difference between the input voltage and the operation start voltage, and the current minor loop uses this input current reference value as the current limiting signal. Is controlled so that the current limit signal can be generated very stably.

According to the third aspect of the invention, when the output voltage is smaller than the output reference voltage, the drive control signal is generated, and otherwise, the drive control signal is stopped from being generated. With such various controls, the output voltage can be made to follow the output reference voltage with certainty.

According to the fourth aspect of the invention, since the PWM comparator and the oscillator are included and the PWM pulse is generated as the drive control signal for the booster circuit, the follow-up control of the input current and the output voltage of the booster circuit is performed. You can do it more accurately.

According to the fifth aspect of the present invention, since it operates so as to compensate for the instability of the output power due to wind power generation, the advantages of wind power generation can be fully enjoyed.
That is, the present invention is particularly effective for application to wind power generation.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an input power tracking conversion circuit of the present invention.

2 (A), (B), (C) and (D) are inputs by the input power tracking type conversion circuit shown in FIG. 1 when a wind power generator is used as the DC generator 2. It is a time chart which shows electric power, an input voltage, an input current, and an output voltage.

FIG. 3 is a configuration diagram of a conventional conversion circuit.

4 (A), (B), (C) and (D) are input power and input by the conventional conversion circuit of FIG. 3 when a general synchronous generator is used as a DC generator, respectively. It is a time chart which shows a voltage, an input current, and an output voltage.

5 (A), (B), (C) and (D) are respectively input power and input voltage by the conventional conversion circuit of FIG. 3 when a wind power generator is used as the DC generator 2. ,
It is a time chart which shows an input current and an output voltage.

[Explanation of symbols]

1 Input power tracking type conversion circuit 2 DC generator (generator) 3 inverter circuit 11 Current detection circuit 12 DC / DC converter (step-up circuit) 13 Current minor loop 14 oscillator 15 PWM converter

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takeshi Nakamura             266 Suzaki-cho, Kanazawa-shi, Ishikawa Co., Ltd.             Inside Nakakata F-term (reference) 5H730 AA12 AS04 BB14 BB57 BB86                       CC28 DD02 DD26 EE79 FD01                       FD11 FD41 FF01 FG05 FG25                       XC04

Claims (5)

[Claims] 1. A booster circuit that is connected to a generator and that boosts an input voltage to a predetermined voltage and outputs the boosted voltage in response to a drive control signal; and the input voltage and a preset operation start voltage of the booster circuit. And a current limit signal generating means for generating a current limit signal indicating a limit value of the input current to the booster circuit, which corresponds to the difference between the output voltage of the booster circuit and the input current. Along with the output reference voltage to generate the drive control signal for causing the input current to follow the limit value represented by the current limit signal,
An input power tracking type conversion circuit comprising: a current-voltage control unit supplied to the booster circuit. 2. The input power tracking type conversion circuit according to claim 1, wherein the current limit signal generation means generates an input current reference value based on a difference between the input voltage and the operation start voltage. An input power tracking conversion circuit comprising: a current minor loop that generates the current limiting signal so as to follow the input current reference value. 3. The input power tracking type conversion circuit according to claim 2, wherein the current-voltage control circuit generates the drive control signal when the output voltage is smaller than an output reference voltage, and otherwise the above-mentioned. An input power tracking type conversion circuit characterized by stopping generation of a drive control signal. 4. The input power tracking type conversion circuit according to claim 3, wherein the current-voltage control circuit generates a PWM pulse as the drive control signal.
An input power tracking type conversion circuit comprising a comparator and an oscillator. 5. The input power tracking conversion circuit according to claim 4, wherein the generator is a DC generator that outputs a DC signal generated by wind power generation, and the booster circuit is connected to the DC generator. DC / D
An input power tracking type conversion circuit characterized by being a C converter.