JP5219207B2 - DC power supply - Google Patents

DC power supply Download PDF

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JP5219207B2
JP5219207B2 JP2008305854A JP2008305854A JP5219207B2 JP 5219207 B2 JP5219207 B2 JP 5219207B2 JP 2008305854 A JP2008305854 A JP 2008305854A JP 2008305854 A JP2008305854 A JP 2008305854A JP 5219207 B2 JP5219207 B2 JP 5219207B2
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rectifier circuit
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JP2010130866A (en
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安二 山田
悟司 鈴村
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株式会社中央製作所
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  The present invention rectifies commercial AC power, converts the output into high frequency AC by an inverter, boosts or steps down this AC to a predetermined voltage by a transformer, and rectifies it again to obtain a DC. The present invention relates to a power supply device.

  In recent years, in DC power supply devices for surface treatment such as plating and anodized, the supplied commercial AC power is rectified by a first rectifier circuit, and the output is converted to a high-frequency rectangular wave AC by an inverter. A method called an inverter method, a switching method, a DC-DC converter method, etc. has been used in which a direct current is obtained by reducing the voltage to a predetermined voltage and then rectifying by a second rectifier circuit. Yes. This type of system has the advantage that the waveform of the DC output is good, and because it uses a high-frequency transformer, the transformer is small, so the entire DC power supply is small and lightweight. It tends to increase.

  A DC power supply unit that exceeds a certain capacity of this type uses a three-phase commercial AC power supply as an input, and a large-capacitance capacitor is connected to the output of the first rectifier circuit in order to reduce ripples at six times the frequency of the AC power supply. Has been. However, in a capacitor input circuit in which a large-capacitance capacitor is connected to the output of the rectifier circuit in this way, the input current waveform on the AC side is pulsed, so the harmonic component of the input current is large, and the capacitor is large when the power is turned on. Since the charging current flows, measures for improving the input current waveform and suppressing the charging current are required. Conventionally, a countermeasure such as inserting a reactor or filter on the input side to improve the input current waveform has been introduced, but a current limiting resistor has been inserted on the input side to suppress the charging current. It was normal to take measures to short the resistors.

  However, these measures require a large number of parts including large parts, resulting in an increase in cost. When these parts are incorporated, the advantage that the power supply device becomes smaller and lighter due to the miniaturization of the transformer is lost. There was a problem of being. This problem is particularly noticeable when the DC power supply has a large capacity. Therefore, as a method for solving such a problem, it has been considered that the capacitor connected to the output of the first rectifier circuit has a small capacity enough to absorb only the switching energy of the inverter. If the capacitor has a small capacity, there is no portion for storing a large amount of energy between the AC input and the inverter, so that a uniform current flowing through the inverter is supplied as it is from the AC input. As a result, the distortion of the current waveform of the AC input is greatly suppressed as compared with the case where the capacitor has a large capacity, and charging of the capacitor is completed in a short time, so that no special measures are required.

However, when the method of reducing the capacitor connected to the output of the first rectifier circuit is implemented, resonance may occur between the inductance of the transformer on the AC power supply side and this capacitor. In this case, there is a problem that the protection circuit operates due to an overvoltage generated by resonance and the DC power supply device stops. It has been confirmed that this resonating phenomenon is likely to occur when the capacity of the DC power supply device exceeds a certain level with respect to the capacity of the transformer on the AC power supply side. For this reason, a method for reducing the capacity of the capacitor connected to the output of the first rectifier circuit has not yet been put to practical use, and there is no literature regarding other methods.
None

  The present invention has been made to solve the above problems and provide a DC power supply device that does not require a reactor or a filter for improving an input current waveform, or a resistor and an electromagnetic contactor for suppressing a charging current. Is.

In order to solve the above problem, the invention of claim 1 includes a first rectifier circuit for rectifying a three-phase commercial power supply, a small-capacitance capacitor connected to the output of the first rectifier circuit, A single-phase inverter that converts the output of the rectifier circuit into alternating current, a transformer that converts the output of the inverter into a predetermined voltage, and a second rectifier circuit that rectifies the secondary output of the transformer, In a DC power supply apparatus comprising an output control means comprising an error signal amplifier that amplifies a difference between an output current or a DC output voltage and a reference signal, and a PWM modulator that controls a DC output by the output signal of the error signal amplifier, A rectifier circuit output AC component detecting means for detecting an AC component of the output voltage of the rectifier circuit is provided, and the rectifier circuit output AC component signal detected by the rectifier circuit output AC component detector is added to the output control means. It is intended.

  In the first aspect of the present invention, a band elimination filter for removing a component having a frequency six times that of the AC power source from the rectifier circuit output AC component signal detected by the rectifier circuit output AC component detection means, and an error signal between the output signal of the band elimination filter. An adder that adds to the output signal of the signal amplifier and adds it to the PWM modulator is provided, and a signal obtained by removing a component having a frequency six times that of the AC power source from the AC signal output from the rectifier circuit is added to the PWM modulator. Is a band elimination filter that removes a component having a frequency six times that of the AC power source from the rectifier circuit output AC component signal detected by the rectifier circuit output AC component detection means, and an output signal of the band elimination filter. An adder for adding to the reference signal input to the error signal amplifier is provided, and a signal obtained by removing a component having a frequency six times that of the AC power source from the rectifier circuit output AC signal is used as the error signal amplifier. Was so added to the reference signal power is an invention of claim 3.

  In the first aspect of the present invention, a voltage-controlled voltage divider that divides the rectifier circuit output AC divided signal detected by the rectifier circuit output AC voltage dividing means at a voltage division ratio corresponding to a DC output current value, and an output of the voltage controlled voltage divider An adder that adds the signal to the output signal of the error signal amplifier and adds the signal to the PWM modulator, and adds the signal obtained by dividing the rectifier circuit output AC divided signal by a voltage dividing ratio corresponding to the DC output current value to the PWM modulator. According to a fourth aspect of the present invention, there is provided a voltage-controlled voltage divider that divides a rectifier circuit output AC divided signal detected by the rectifier circuit output AC component detection means at a voltage division ratio corresponding to a DC output current value, and voltage control An adder for adding the output signal of the voltage divider to the reference signal input to the error signal amplifier, and a signal obtained by dividing the rectifier circuit output AC divided signal by a voltage dividing ratio corresponding to the DC output current value to the error signal amplifier. Input That was so added to the reference signal is a fifth aspect of the present invention.

  The invention according to claim 2 or 3 is the invention according to claim 6 in which all or part of the error signal amplifier, the PWM modulator, the band elimination filter and the adder are constituted by a microprocessor. In the present invention, a part or all of the error signal amplifier, the PWM modulator, the voltage control voltage divider and the adder are constituted by a microprocessor. In the first to seventh inventions described above, the capacitance of the capacitor connected to the output of the first rectifier circuit is preferably 10 μF or less per 1 kW capacity of the DC power supply device, and this is the invention of the eighth invention. .

  According to the present invention, since the small-capacitance capacitor is connected to the output of the first rectifier circuit, the distortion of the current waveform of the AC input can be greatly suppressed as compared with the case where the large-capacitance capacitor is connected. Charging is completed in a short time, and there is an advantage that no special measures are required. Due to the small capacity of the capacitor, there was a resonance with the inductance of the transformer on the AC power supply side and this capacitor, but the output control means outputs the rectifier circuit output AC component signal detected by the rectifier circuit output AC component detection means Therefore, when resonance occurs, the output is controlled so that the input current of the inverter suppresses resonance, and resonance does not occur.

  According to the second aspect of the present invention, since a signal obtained by removing a component having a frequency six times that of the AC power source from the AC component signal output from the rectifier circuit is added to the PWM modulator, it is needless to say that resonance does not occur. Since a component having a frequency six times that of the AC power supply is removed from the AC signal output from the rectifier circuit applied to the PWM modulator, the ripple of the first rectifier circuit is not added to the PWM modulator. Does not shift to DC output. In the invention of claim 3, since a signal obtained by removing a component having a frequency six times that of the AC power source from the AC signal output from the rectifier circuit is added to the reference signal, the input current of the inverter similarly suppresses resonance. Therefore, the resonance does not occur and the ripple of the first rectifier circuit does not shift to the DC output.

  According to the invention of claim 4, the rectifier circuit output AC component signal is applied to the PWM modulator in a magnitude corresponding to the DC output current value. This is particularly true under an output condition where the DC output current is likely to cause resonance. Since it is added to the PWM modulator with a large value, the input current of the inverter is controlled so as to strongly suppress resonance, and resonance does not occur. In the fourth aspect of the present invention, a component having a frequency six times that of the AC power supply is not removed from the AC signal output from the rectifier circuit supplied to the PWM modulator. As a result, the ripple of the first rectifier circuit shifts to DC output, but the ripple of DC output current is sufficiently suppressed because the load time constant is large under the output conditions where the DC output current is large. . In addition, under the output condition where the DC output current is small, the rectifier circuit output AC component signal is added to the PWM modulator with a small value, so the ripple that shifts to the DC output is not a problem and is configured with an analog circuit. In some cases, there is an advantage that a band elimination filter that is troublesome to adjust is not required.

  In the fifth aspect of the invention, the rectifier circuit output AC component signal is added to the reference signal in a magnitude corresponding to the DC output current value, and similarly, the inverter input current is controlled to suppress resonance. Resonance does not occur, and ripple that shifts to DC output does not become a problem. In the inventions of claims 6 and 7, all or a part of the error signal amplifier, the PWM modulator, the band elimination filter, the voltage control voltage divider, the adder and the like are constituted by a microprocessor, and the hardware becomes simple. There is an advantage that the number of adjustment steps is greatly reduced.

Next, the best mode for carrying out the present invention will be specifically described with reference to the drawings.
FIG. 1 is a connection diagram showing a first embodiment of the invention of claim 2 and is supplied from an AC input terminal 3 constituted by a rectifier 1 which is a first rectifier circuit and a capacitor 2 having a small capacity. A direct current power source for converting alternating current power into direct current power is provided. Conventionally, the capacitance of the capacitor 2 is normally 500 μF or more per 1 kW of the DC power supply device. However, in the present invention, for example, the capacitance of the capacitor 2 is about 10 μF per 1 kW of the DC power supply device. The positive poles of the semiconductor switches 4a and 4b are connected to the positive pole of the DC power supply, and the negative poles of the semiconductor switches 4a and 4b are connected to the negative poles of the semiconductor switches 5a and 5b, respectively. The positive pole is connected. These semiconductor switches 4a, 4b, 5a, 5b constitute a single-phase inverter, and it is preferable to use a high-speed switching element such as an IGBT.

  The primary winding of the transformer 6 is connected between the connection point of the semiconductor switches 4a and 5a and the connection point of the semiconductor switches 4b and 5b, which are output terminals of the inverter, and the secondary winding of the transformer 6 A center tap is provided, and anodes of diodes 7a and 7b are respectively connected to both ends to constitute a second rectifier circuit. The transformer 6 has a turn ratio such that a predetermined DC output voltage is obtained. The cathodes of the diodes 7a and 7b are connected to the positive DC output terminal 8a, and the center tap of the transformer 6 is connected to the negative DC output terminal 8b. Each is connected. Reference numeral 9 denotes an output current detector that detects a DC output current, and a shunt, a Hall element, or the like can be used.

  The output current detection signal of the DC output current detected by the output current detector 9 and the output voltage detection signal of the DC output voltage output to the DC output terminals 8a and 8b are connected to be input to the error signal amplifier 10, respectively. It is. A set current reference signal 11 and a voltage reference signal 12 are input to the error signal amplifier 10. The error signal amplifier 10 amplifies the difference between the output current detection signal and the current reference signal 11 and detects the current error signal and the output voltage. One of the voltage error signals obtained by amplifying the difference between the signal and the voltage reference signal 12 is output. Which of the current error signal and the voltage error signal is output can be selected by switching or automatically selected from the larger one. The output of the error signal amplifier 10 is input to the PWM modulator 14 via the adder 13, and the error signal amplifier 10 and the PWM modulator 14 constitute output control means.

  The PWM modulator 14 generates drive signals to be alternately applied to the group of semiconductor switches 4a and 5b and the group of semiconductor switches 4b and 5a, similar to those used in the conventional DC power supply device of such a system. The duty of the ON time of the drive signal is changed according to the voltage of the input signal given from the device 13. The drive signals generated by the PWM modulator 14 for the semiconductor switches 4a, 4b, 5a, and 5b are added to the gate drive circuit 15, and the gate drive circuit 15 insulates and amplifies the drive signals to each semiconductor switch 4a, It is added to the gates 4b, 5a and 5b.

  The output voltage of the rectifier 1 is appropriately divided by a voltage divider (not shown) and then input to the insulation amplifier 16, and the insulation amplifier 16 outputs only the AC component of the divided output voltage of the rectifier 1 to the rectifier circuit output AC divided signal. Is output. The voltage divider and the insulation amplifier 16 constitute a rectifier circuit output AC partial detection circuit. The output of the insulation amplifier 16 is input to a band elimination filter 17 that removes a component having a frequency six times that of the AC power supply. The output of the band elimination filter 17 is input to the adder 13 via a coefficient unit 18. .

  As a result, a signal obtained by dividing a signal obtained by removing a component having a frequency six times that of the AC power source from the rectifier circuit output AC divided signal is added to the output of the error signal amplifier 10 and input to the PWM modulator 14. Will be. The band elimination filter 17 preferably has a high Q, and a digital filter other than an active filter using a twin T circuit or a twin T circuit can be used. The digital type has an advantage that the removal frequency can be selected without adjustment, and the power supply frequency can be easily adjusted to 50 Hz and 60 Hz.

  The operation of the DC power supply device configured as described above will be described below. The rectifier 1 rectifies AC power supplied from the AC input terminal 3 and supplies it to an inverter composed of semiconductor switches 4a, 4b, 5a, and 5b. The set of semiconductor switches 4a and 5b and the set of semiconductor switches 4b and 5a are alternately turned on by the drive signal generated by the PWM modulator 14 applied via the gate drive circuit 15, and the high-frequency rectangular wave AC power is converted to the transformer 6 To the primary winding. The diodes 7a and 7b rectify the AC power of the secondary winding of the transformer 6 converted into a predetermined voltage, and output the DC power to the DC output terminals 8a and 8b.

  The error signal amplifier 10 outputs either a current error signal obtained by amplifying the difference between the output current detection signal and the current reference signal 11 or a voltage error signal obtained by amplifying the difference between the output voltage detection signal and the voltage reference signal 12, and performs PWM modulation. To the container 14. The PWM modulator 14 changes the duty of the on-time of the semiconductor switches 4a, 4b, 5a, 5b in accordance with the signal given from the error signal amplifier 10. When the error signal amplifier 10 outputs a current error signal by switching, the output current is controlled to be constant, and when the voltage error signal is output, the output voltage is controlled to be constant. When the current error signal or voltage error signal, whichever is larger, is automatically selected and output, the output voltage is lower if the output current is lower than the set value, and the output current is higher if the output voltage is lower than the set value. Each is controlled to be constant. Such an operation is the same as that of a conventional DC power supply device of such a system.

  Here, the capacitor 2 has a remarkably small capacity as compared with the conventional DC power supply device of this type, and a ripple having a frequency six times that of a large AC power supply remains as compared with the case where a capacitor having a large capacity is provided. become. When this ripple is transmitted to the output current or the output voltage, this ripple is also a difference from the current reference signal 11 or the voltage reference signal 12, respectively, and the error signal amplifier 10 outputs it as a current error signal or a voltage error signal. It will be. The PWM modulator 14 changes the on-time duty of the semiconductor switches 4a, 4b, 5a, and 5b by the output of the error signal amplifier 10, the output current or output voltage on the DC side is controlled to be constant, and the ripple of the DC output is reduced. It is suppressed.

  Further, an AC component of the output voltage of the rectifier 1 divided by the voltage dividing ratio on the input side of the isolation amplifier 16 is obtained from the isolation amplifier 16 as a rectifier circuit output AC signal, and the band elimination filter 17 outputs a rectifier circuit output AC. A signal obtained by removing a component having a frequency six times that of the AC power source from the minute signal is obtained. This signal is divided by the coefficient of the coefficient unit 18 and input to the adder 13. The signal is added to the output signal of the error signal amplifier 10 by the adder 13 and input to the PWM modulator 14. Therefore, when resonance occurs between the inductance of the transformer on the AC power supply side and the capacitor 2, a signal that is added to the output of the error signal amplifier 10 and proportional to the resonance waveform is input to the PWM modulator 14.

  Here, the AC component of the output voltage of the rectifier 1 is divided by a voltage division ratio determined by the voltage division ratio on the input side of the insulation amplifier 16 and the coefficient of the coefficient unit 18 and is input to the PWM modulator 14. The overall voltage dividing ratio is a ratio obtained by dividing the value of the input voltage of the PWM modulator 14 when the duty of the on-time of the semiconductor switches 4a, 4b, 5a and 5b is maximized by the value of the DC output voltage of the rectifier 1. It is preferably 1 to 3 times. For example, if the value of the input voltage of the PWM modulator 14 when the duty of the on-time of the semiconductor switches 4a, 4b, 5a and 5b is maximized is 5V and the DC output voltage of the rectifier 1 is 300V, the overall voltage dividing ratio Becomes 1/60 to 1/20.

Since the PWM modulator 14 lengthens the on-time of the semiconductor switches 4a, 4b, 5a, 5b when the voltage of the input signal increases, the on-time of the semiconductor switches 4a, 4b, 5a, 5b at the moment when the voltage increases due to resonance. Becomes longer and changes in the direction in which the input current of the inverter increases, and acts to lower the voltage across the capacitor 2. At the moment when the voltage decreases, the on-time of the semiconductor switches 4a, 4b, 5a, and 5b is shortened, and the input current of the inverter is changed to decrease, thereby acting to increase the voltage across the capacitor 2. . As a result, a change in voltage across the capacitor 2 is suppressed, and resonance is suppressed.

  Even if a voltage proportional to the AC component of the output voltage of the rectifier 1 is simply input to the PWM modulator 14, resonance is suppressed, but a ripple having a frequency six times that of the AC power supply is also input to the PWM modulator 14. Will be. The PWM modulator 14 operates to increase the on-time of the semiconductor switches 4a, 4b, 5a, and 5b if the voltage rises in the same manner with respect to this ripple. There is a problem that becomes larger. In the configuration shown in FIG. 1, a signal obtained by removing a component having a frequency six times that of the AC power source from the AC component signal output from the rectifier circuit is input to the PWM modulator 14, so this is not the case. As described above, the ripple of the DC output is suppressed by the feedback loop including the error signal amplifier 10 and the PWM modulator 14.

  FIG. 2 is a connection diagram showing a second embodiment of the invention of claim 2, which is basically the same as that of the configuration of FIG. 1, and the same parts are denoted by the same reference numerals. is there. The difference is the configuration of the rectifier circuit output AC component detection circuit that detects the AC component of the output voltage of the rectifier 1 and obtains an AC component signal from the rectifier circuit. The detection capacitor 19 is connected in parallel with the capacitor 2 and the detection is performed. A current transformer 20 for detecting the current flowing through the capacitor 19 is provided. A termination capacitor 21 is connected in parallel to the secondary winding of the current transformer 20 and is input to the band elimination filter 17. As a result, the AC component of the output voltage of the rectifier 1 is divided and input to the band elimination filter 17 by the ratio of the capacitance of the detection capacitor 19 and the capacitance of the termination capacitor 21 and the turn ratio of the current transformer 20. Will be.

  The configuration shown in FIG. 2 is the same as that shown in FIG. 1 except that the configuration of the rectifier circuit output AC component detection circuit is different as described above. The output current or output voltage is controlled to be constant and the ripple of the DC output is suppressed, and the resonance caused by the inductance of the AC power supply side transformer and the capacitor 2 is suppressed. In the configuration of FIG. 2, the rectifier circuit output AC component signal is obtained by the detection capacitor 19, the current transformer 20, and the termination capacitor 21 connected in parallel to the secondary winding of the current transformer 20, which is expensive. There is an advantage that the insulating amplifier 16 and the power supply device for the insulating amplifier 16 are not required, and the frequency characteristic and the phase characteristic are excellent.

  FIG. 3 is a connection diagram showing an embodiment of the invention of claim 3. Many portions are the same as those of the configuration of FIG. 2, and the same portions are denoted by the same reference numerals. In the configuration shown in FIG. 3, the current reference signal 11 and the voltage reference signal 12 are connected so as to be input to the error signal amplifier 10 through the adder 22 and the adder 23, respectively. The output of the band elimination filter 17 is input through the coefficient unit 18. The output of the error signal amplifier 10 is directly input to the PWM modulator 14. As a result, the error signal amplifier 10 has a voltage obtained by removing the current reference signal 11 and the voltage reference signal 12 set as the current reference signal and the voltage reference signal from the rectifier circuit output AC component signal and a component having a frequency six times that of the AC power supply. A signal to which a proportional signal is added is given.

  In the configuration of FIG. 3, since the output of the error signal amplifier 10 is directly input to the PWM modulator 14 as in the conventional DC power supply device, the output current detection signal or output input to the error signal amplifier 10 The DC output is controlled so that the voltage detection signal matches the input current reference signal or voltage reference signal. The current reference signal and the voltage reference signal input to the error signal amplifier 10 are components of the current reference signal 11 and the voltage reference signal 12 which are set as described above, having a frequency six times that of the AC power source from the AC rectifier circuit output AC signal. A signal proportional to the resonance waveform is added to the current reference signal 11 and the voltage reference signal 12 when resonance occurs between the inductance of the transformer on the AC power supply side and the capacitor 2. Will be.

  As a result, at the moment when the voltage of the reference signal increases due to resonance, the output current or output voltage is controlled to increase, and the duty of the on-time of the semiconductor switches 4a, 4b, 5a, 5b is increased, and the inverter The input current changes in the increasing direction, and acts to reduce the voltage across the capacitor 2. Also, at the moment when the voltage of the reference signal decreases due to resonance, the output current or output voltage is controlled to decrease, and the on-time duty of the semiconductor switches 4a, 4b, 5a and 5b decreases, and the input current of the inverter decreases. It acts to increase the voltage across the capacitor 2. As a result, a change in voltage across the capacitor 2 is suppressed, and resonance is suppressed.

  FIG. 4 is a connection diagram showing an embodiment of the invention of claim 4, and many parts are the same as those of the configuration of FIG. 2, and the same parts are denoted by the same reference numerals. The difference between the configuration of FIG. 4 and the configuration of FIG. 2 is that the band elimination filter 17 is replaced with an analog switch 24 and a low-pass filter 25 to generate a drive signal for the analog switch 24 and a comparator 26. 26 is provided with a triangular wave signal source 27 for supplying a triangular wave. The rectifier circuit output AC signal obtained by the termination capacitor 21 is input to the low-pass filter 25 via the analog switch 24, and the output of the low-pass filter 25 is input to the adder 13 via the coefficient unit 18. It is.

  The control terminal of the analog switch 24 is connected to the output of the comparator 26, and the triangular wave signal generated by the triangular wave signal source 27 and the output current detection signal from the output current detector 9 are input to the comparator 26. The comparator 26 applies a drive signal to the analog switch 24 while the value of the output current detection signal exceeds the value of the triangular wave signal, and turns on the analog switch 24. The frequency of the triangular wave generated by the triangular wave signal source 27 is selected to be sufficiently higher than the frequency at which the inverter is driven, the cutoff frequency of the low-pass filter 25 is sufficiently lower than the frequency of the triangular wave generated by the triangular wave signal source 27, and It is preferable to select at least several times the frequency at which the inverter is driven. Specifically, for example, when the drive frequency of the inverter is 10 kHz, the triangular wave frequency can be 300 kHz, and the cutoff frequency of the low-pass filter 25 can be 30 kHz.

  Since the comparator 26 gives a drive signal to the analog switch 24 while the value of the output current detection signal exceeds the value of the triangular wave signal, the on-time duty of the analog switch 24 is proportional to the value of the output current detection signal. The analog switch 24, the low-pass filter 25, the comparator 26, and the triangular wave signal source 27 operate as a voltage-controlled voltage divider in which the voltage division ratio changes according to the value of the output current detection signal. The low-pass filter 25 removes the frequency component of the triangular wave signal, and the rectifier circuit output AC divided signal is divided by a voltage controlled voltage divider constituted by an analog switch 24 and the like and input to the coefficient unit 18. Therefore, the rectifier circuit output AC divided signal is divided and input to the adder 13 by the voltage dividing ratio of the voltage controlled voltage divider constituted by the analog switch 24 and the like and the voltage dividing ratio by the coefficient of the coefficient unit 18.

  In the configuration shown in FIG. 4, the PWM modulator 14 changes the on-time duty of the semiconductor switches 4a, 4b, 5a, and 5b in accordance with the signal supplied from the error signal amplifier 10 as in the conventional DC power supply device. The DC output current or DC output voltage is controlled to be constant. In this configuration, when the DC output current is large, the AC signal output from the rectifier circuit supplied to the PWM modulator 14 becomes large, and the resonance given to the PWM modulator 14 when resonating between the inductance of the transformer on the AC power supply side and the capacitor 2. The signal proportional to the waveform increases. As a result, resonance is strongly suppressed when the DC output current is large.

  At this time, since a component having a frequency six times that of the AC power supply is not removed from the rectifier circuit output AC signal, the signal supplied to the PWM modulator 14 also includes a ripple component having a frequency six times that of the AC power supply. The ripple of DC output becomes large. However, the load time constant is large under the output condition where the DC output current is large, and the ripple of the DC output current is sufficiently suppressed by the load and does not cause a problem. In addition, the load time constant is small under the output condition where the DC output current is small, and the ripple suppression effect due to the load is reduced. However, the rectifier circuit output AC component signal supplied to the PWM modulator 14 becomes small, so that the ripple becomes more problematic. Does not increase. In such a range of output conditions where the DC output current is small, resonance can be suppressed even if the rectifier circuit output AC signal supplied to the PWM modulator 14 is small.

  FIG. 5 is a connection diagram showing an embodiment of the invention of claim 5, and many portions are the same as those of the configuration of FIG. 4, and the same portions are denoted by the same reference numerals. In the configuration of FIG. 5, the current reference signal 11 and the voltage reference signal 12 are connected so as to be input to the error signal amplifier 10 through the adder 28 and the adder 29, respectively. The output of the low-pass filter 25 is input through the device 18. The output of the error signal amplifier 10 is directly input to the PWM modulator 14 without passing through the adder 13. Thus, the error signal amplifier 10 has a current reference signal and a voltage reference signal, and the current reference signal 11 and the voltage reference signal 12 to be set are divided into a voltage dividing ratio and a coefficient unit 18 of a voltage control voltage divider constituted by an analog switch 24 or the like. Thus, the rectifier circuit output AC divided signal divided by the voltage division ratio of the coefficient is input.

  5, the output current detection signal or output voltage detection signal input to the error signal amplifier 10 and the input current reference signal or voltage reference signal coincide with each other as in the conventional DC power supply device. Thus, the direct current output is controlled. The current reference signal and voltage reference signal input to the error signal amplifier 10 are obtained by adding a signal proportional to the rectifier circuit output AC component signal to the current reference signal 11 and voltage reference signal 12 as described above. When the inductance of the transformer on the side and the capacitor 2 resonate, a signal proportional to the resonance waveform is added to the current reference signal 11 and the voltage reference signal 12.

As a result, at the moment when the voltage of the reference signal increases due to resonance, the output current or the output voltage is controlled to increase so that the input current of the inverter increases and the voltage across the capacitor 2 is decreased. When the voltage of the reference signal drops, the reverse action acts to suppress the change in the voltage across the capacitor 2 and suppress the resonance. The rectifier circuit output AC component signal added to the current reference signal 11 and the voltage reference signal 12 increases when the DC output current is large, and resonance is strongly suppressed when the DC output current is large. The resonance is suppressed and the ripple of the DC output does not increase so as to be a problem, as in the configuration of FIG.

  Although not shown, all or part of the error signal amplifier, the PWM modulator, the band elimination filter, and the adder can be configured by a microprocessor in the configuration shown in FIGS. In the configuration of FIG. 5, all or part of the error signal amplifier, the PWM modulator, the voltage control voltage divider, and the adder can be configured by a microprocessor. In particular, when all of these are configured by a microprocessor, all signals can be processed digitally by converting the rectifier circuit output AC component signal, output current detection signal and output voltage detection signal into digital signals by an AD converter. There is an advantage that hardware and adjustment man-hours can be greatly reduced.

  As described above, according to the present invention, since the capacitor 2 of the output of the rectifier 1 has a small capacity, distortion of the current waveform of the AC input can be greatly suppressed as compared with the case where the capacitor has a large capacity. Charging is completed in a short time, and there is an advantage that no special measures are required for improving the input current waveform and suppressing the charging current. The resonance between the inductance of the transformer on the side of the AC power source and the capacitor 2 that may have occurred due to the small capacity of the capacitor 2 is the output of the error signal amplifier 10 in the invention of claim 2 configured as shown in FIG. In the invention of claim 3 configured as shown in FIG. 3, the rectifier circuit output AC divided signal is divided and added to the current reference signal 11 and the voltage reference signal 12 input to the error signal amplifier 10, respectively. The on-time duty of the semiconductor switches 4a, 4b, 5a, and 5b is controlled and suppressed so as to suppress resonance by the input current.

  According to the second and third aspects of the present invention, a component having a frequency six times that of the AC power supply is removed from the PWM modulator 14 or the AC component signal output from the rectifier circuit added to the current reference signal 11 and the voltage reference signal 12. The output pull of 1 does not shift to DC output. Further, the resonance between the inductance of the transformer on the AC power supply side and the capacitor 2 is caused in the output signal of the error signal amplifier 10 in the invention of the configuration of FIG. 4 and in the error signal of the invention of the configuration of FIG. Since the rectifier circuit output AC divided signal is divided and added to the current reference signal 11 and the voltage reference signal 12 input to the signal amplifier 10, respectively, as in the case of the invention of claim 2 or claim 3, The on-time duty of the semiconductor switches 4a, 4b, 5a, and 5b is controlled and suppressed so that the input current suppresses resonance.

  At this time, the rectifier circuit output AC divided signal is large when the output current detection signal is large by the voltage controlled voltage divider constituted by the analog switch 24 or the like, and is small when the output current detection signal is small, or the output signal of the error signal amplifier 10 or Since it is added to the current reference signal 11 and the voltage reference signal 12, it is greatly added under the output condition where the direct current output current, which is likely to cause resonance, is large, and the resonance is strongly suppressed. Here, from the output signal of the error signal amplifier 10 or the AC signal output from the rectifier circuit added to the current reference signal 11 and the voltage reference signal 12, a component having a frequency six times that of the AC power supply is not removed, and the rectifier 1 The output pull is shifted to DC output.

  The amount of ripple transition increases as the rectifier circuit output AC component signal added to the PWM modulator 14 or the current reference signal 11 and the voltage reference signal 12 increases, and increases as the output current detection signal increases, but the DC output current increases. Since the load time constant is large under a large output condition, the ripple of the DC output current is sufficiently suppressed. Further, under the output condition where the DC output current is small, the ripple suppression effect due to the load time constant is small, but the rectifier circuit output AC component signal applied to the PWM modulator 14 or the current reference signal 11 and the voltage reference signal 12 is small. Therefore, since the amount of ripple transition is small, the ripple of the DC output does not become a problem. The inventions according to claims 4 and 5 have an advantage that a band elimination filter that is troublesome to adjust is not required when it is constituted by an analog circuit.

It is a connection diagram showing a first embodiment of the invention of claim 2. It is a connection diagram which shows 2nd embodiment of invention of Claim 2. It is a connection diagram showing an embodiment of the invention of claim 3. FIG. 6 is a connection diagram showing an embodiment of the invention of claim 4. FIG. 6 is a connection diagram showing an embodiment of the invention of claim 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rectifier 2 Capacitor 3 AC input terminal 4a, 4b, 5a, 5b Semiconductor switch 6 Transformer 7a, 7b Diode 8a, 8b DC output terminal 9 Output current detector 10 Error signal amplifier 11 Current reference signal 12 Voltage reference signal 13 Adder DESCRIPTION OF SYMBOLS 14 PWM modulator 15 Gate drive circuit 16 Isolation amplifier 17 Band elimination filter 18 Coefficient unit 19 Detection capacitor 20 Current transformer 21 Termination capacitor 22, 23 Adder 24 Analog switch 25 Low-pass filter 26 Comparator 27 Triangular wave signal source 28 , 29 Adder

Claims (8)

  1. A first rectifier circuit that rectifies a three-phase commercial power supply, a small-capacitance capacitor connected to the output of the first rectifier circuit, a single-phase inverter that converts the output of the first rectifier circuit into alternating current, and an inverter An error signal amplifier that amplifies a difference between a DC output current or a DC output voltage and a reference signal, and a transformer that converts the output of the output into a predetermined voltage and a second rectifier circuit that rectifies the secondary output of the transformer Rectifier circuit output AC component for detecting the AC component of the output voltage of the first rectifier circuit in a DC power supply device comprising an output control means comprising a PWM modulator for controlling the DC output by the output signal of the error signal amplifier A DC power supply apparatus comprising: a detecting unit, and adding a rectifier circuit output AC component signal detected by the rectifier circuit output AC component detector unit to the output control unit.
  2.   A band elimination filter that removes a component having a frequency six times that of the AC power source from the rectifier circuit output AC signal detected by the rectifier circuit output AC component detection means, and the output signal of the band elimination filter is added to the output signal of the error signal amplifier. An adder for adding to the PWM modulator is provided, and a signal obtained by removing a component having a frequency six times that of the AC power supply from the rectifier circuit output AC component signal is added to the PWM modulator. The direct current power supply device described.
  3.   A band elimination filter that removes a component having a frequency six times that of the AC power supply from the rectifier circuit output AC component signal detected by the rectifier circuit output AC component detection means, and a reference signal that is input to the error signal amplifier as an output signal of the band elimination filter And an adder for adding to the reference signal input to the error signal amplifier, wherein a signal obtained by removing a component having a frequency six times that of the AC power supply from the AC signal output from the rectifier circuit is added. Item 4. The DC power supply device according to Item 1.
  4.   A voltage control voltage divider that divides the rectifier circuit output AC divided signal detected by the rectifier circuit output AC voltage dividing means at a voltage dividing ratio corresponding to the DC output current value, and the output signal of the voltage controlled voltage divider is used as the output signal of the error signal amplifier. An adder for adding and adding to a PWM modulator is provided, and a signal obtained by dividing a rectifier circuit output AC divided signal by a voltage dividing ratio corresponding to a DC output current value is added to the PWM modulator. Item 4. The DC power supply device according to Item 1.
  5.   A voltage control voltage divider that divides the rectifier circuit output AC divided signal detected by the rectifier circuit output AC voltage dividing means at a voltage division ratio corresponding to the DC output current value, and an output signal of the voltage controlled voltage divider is input to the error signal amplifier. An adder for adding to the reference signal is provided, and a signal obtained by dividing the AC divided signal output from the rectifier circuit by a voltage dividing ratio corresponding to the DC output current value is added to the reference signal input to the error signal amplifier. The DC power supply device according to claim 1.
  6.   4. The DC power supply device according to claim 2, wherein all or part of the error signal amplifier, the PWM modulator, the band elimination filter, and the adder are configured by a microprocessor.
  7.   6. The DC power supply device according to claim 4, wherein all or part of the error signal amplifier, the PWM modulator, the voltage control voltage divider, and the adder are constituted by a microprocessor.
  8. The DC power supply device according to any one of claims 1 to 7 , wherein the capacitance of the capacitor connected to the output of the first rectifier circuit is set to 1 µF to 20 µF per 1 kW capacitance of the DC power supply device.
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CN102035219B (en) * 2011-01-20 2012-10-03 哈尔滨工业大学 Unipolar ringless wide hysteresis control device and method for grid-connected current of single-phase grid-connected inverter
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TWI514733B (en) * 2012-07-25 2015-12-21 Phihong Technology Co Ltd Non-contact transformer system
ITMO20130267A1 (en) * 2013-09-26 2015-03-27 Meta System Spa Charger for electric vehicles
CN104506042B (en) * 2014-12-23 2017-06-06 刘孝涛 A kind of high reliability constant current On-Board Vehicle DC/DC Converter and control method
CN104917360A (en) * 2015-05-16 2015-09-16 常德立欣电子科技股份有限公司 Intelligent high-frequency switching power source
CN105429476B (en) * 2015-11-20 2018-01-30 北京理工大学 A kind of linear compound piezoelectric ceramic driving power supply of more level switches

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