JP2018061315A - Circuit unit device for constant power output power source and constant power variable dc power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive circuit unit device capable of obtaining constant power controlled output by utilizing a widespread constant voltage/constant current variable DC power supply device.SOLUTION: A constant voltage/constant current variable DC power supply device 100 comprises a constant voltage control circuit and a constant current control circuit including error amplification amplifiers 122 and 124 or a PWM control unit 126. In a circuit unit device 10 for constant power output, an arithmetic processing unit 18 divides a constant power setting value CWSI that is given to an output power setting input terminal 12, by a current monitor signal CMOT that is inputted to a detection current/detection voltage input terminal 14, thereby converting the constant power setting value CWSI into a constant voltage setting value CVSI under an actual output current at that time. Thus, output of constant power can be supplied to a load 210 by utilizing a function of constant voltage control in the constant voltage/constant current variable DC power supply device 100. A circuit configuration of the circuit unit device 10 for constant power output is extremely simplified, thereby reducing cost.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a circuit unit device used for a constant power output power source, and a constant power variable DC power source system using the device.

  As a power source for various industrial devices, a constant voltage / constant current (CV / CC) variable DC power supply device with variable output voltage and output current, which is a switching method or series regulator method, is widely used (Non-Patent Document 1, (See 2nd grade). This type of power supply device that is generally available on the market can be switched between the constant voltage mode and the constant current mode, and the output value of the constant voltage or the output value of the constant current is adjusted by the volume control or the signal input from the outside. Can be changed arbitrarily.

  In recent years, loads that require constant power instead of constant voltage or constant current have increased. In addition to constant voltage and constant current, variable DC power supply devices that can perform constant power control are also commercially available. (Refer nonpatent literature 3).

  In a switching type variable DC power supply device, constant voltage control is generally performed by the following circuit configuration. That is, the output voltage applied to the load (or a voltage proportional thereto) is detected by a voltage detector, and an error signal corresponding to the difference between the detected voltage and the reference voltage is generated by an error amplifier. The PWM (pulse width modulation) control unit adjusts the pulse width of the pulse signal for driving the switching circuit that switches the DC input voltage so that the error signal becomes zero. By such feedback control, the output voltage is kept constant even when a load fluctuation or the like occurs. The constant current control is basically the same, and the output current (or current proportional to the load) supplied to the load is detected as a voltage, and the error amplification amplifier detects the detected voltage and the voltage corresponding to the reference current. An error signal corresponding to the difference is generated. The PWM controller adjusts the pulse width of the pulse signal for driving the switching circuit so that the error signal becomes zero, and maintains the output current constant.

  In a variable DC power supply capable of constant power control in addition to constant voltage and constant current, generally, a constant power control circuit as disclosed in Patent Document 1 is further added to the above-described constant voltage control circuit and constant current control circuit. Is added. The constant power control circuit includes a multiplication circuit that multiplies a voltage signal corresponding to the output voltage detected by the voltage detector and a voltage signal corresponding to the output current detected by the current detector, and a voltage that is a result of the multiplication. An error amplification amplifier that generates an error signal according to a difference from a voltage corresponding to the reference power, and adjusts a pulse width of a pulse signal for driving the switching circuit according to the error signal by the error amplification amplifier .

  Constant voltage / constant current variable DC power supply devices are very common and widely used. On the other hand, there are few power supply devices in which a constant power control function is added to the constant voltage / constant current variable DC power supply device. The reason is considered that the necessity of the power supply device to which the constant power control function has been added has been small so far, and that the power supply device becomes expensive by adding the constant power control function. However, loads that require constant power tend to increase in recent years. Therefore, even when the user owns a general-purpose constant voltage / constant current variable direct-current power supply device that is generally used, the user needs to drive the load with constant power. An expensive variable DC power supply capable of constant power output has to be newly purchased, and there is a problem that the economic burden is large.

Further, when a constant power control circuit including an error amplification amplifier as described above is incorporated into a generally used constant voltage / constant current variable DC power supply device, a constant power control function is added as follows. There are also problems.
That is, when a constant power control function is newly added to a commonly used constant voltage / constant current variable DC power supply device, the output signal of the constant voltage error amplification amplifier and the constant current error amplification in the power supply device are added. What is necessary is just to connect the output of the error amplification amplifier of the above-mentioned constant power control circuit via a diode (that is, wired OR connection) to a connection point where the output signal of the amplifier is wired or connected via a diode. However, in order to adopt such a circuit configuration, it is necessary to modify the inside of the constant voltage / constant current variable DC power supply device, which is a finished product, and there is a possibility that the power supply cannot be guaranteed due to the modification. In addition, if the output of the error amplifier for constant power control is newly connected, the circuit operating conditions may change (matching may become inconsistent), so the output is stable without hunting as a constant power variable DC power supply. Circuit adjustment and evaluation tests are required to operate properly. For this reason, the function expansion by adding the constant power control circuit as described above to the constant voltage / constant current variable DC power supply device generally used is a heavy burden for the device manufacturer, and these are reflected in the cost. It will be.

JP-A-7-31136

"CVCC DC variable power supply Genesys / Z + SERIES", [online], TDK Lambda Corporation, [searched September 27, 2016], Internet <URL: http://www.tdk-lambda.co.jp/products /sps/catalog/jp/genesys.pdf> “DC Power Supply Programmable DC Power Supply (CVCC) KDC series (1500W type)”, [online], Kyoto Denki Co., Ltd. [searched on September 27, 2016], Internet <URL: https: //www.kdn .co.jp / product / dc / kdc / ＞ "DC power supply DPG-10 / DPG-20", [online], ULVAC, Inc. [searched September 27, 2016], Internet <URL: https://www.ulvac.co.jp/products_j/components / power-generator_eb-gun / power-generator / dpg-10dpg-20> "Low Cost Analog Multiplier Data Sheet AD633", [online], Analog Devices, Inc. [searched on September 27, 2016], Internet <URL: http://www.logosfoundation.org/instrum_gwr /chi/AD633.pdf>

  The present invention has been made to solve the above-mentioned problems. The main object of the present invention is to connect to the outside of a generally used constant voltage / constant current variable direct-current power supply device, and to An object of the present invention is to provide an inexpensive and simple constant power output power supply circuit unit device capable of obtaining power-controlled output voltage and output current. Another object of the present invention is to provide a constant power variable DC power supply system capable of selectively obtaining constant voltage control, constant current control, or constant power controlled output voltage and output current at a lower cost than conventional ones. Is to provide.

The first aspect of the circuit unit device for constant power output power supply according to the present invention, which has been made to solve the above problems, has a constant voltage mode and a constant current mode as operation modes, and a voltage monitor as an external terminal. A constant power output power supply circuit unit device used in combination with a constant voltage / constant current variable DC power supply device comprising an output terminal, a current monitor output terminal, an output voltage setting input terminal, and an output current setting input terminal,
a) a detection voltage input terminal connected to a voltage monitor output terminal of the constant voltage / constant current variable DC power supply;
b) a constant current setting output terminal connected to the output current setting input terminal of the constant voltage / constant current variable DC power supply;
c) an output power setting input terminal for externally applying a voltage corresponding to the target output power value;
d) calculating a control voltage by dividing a voltage value applied to the output power setting input terminal by a voltage value input from the detection voltage input terminal or multiplying a result of division by a predetermined value; An arithmetic processing unit to be given to the constant current setting output terminal;
It is characterized by having.

The second aspect of the circuit unit device for constant power output power supply according to the present invention, which has been made to solve the above problems, has a constant voltage mode and a constant current mode as operation modes, and a voltage as an external terminal. A circuit unit device for constant power output power supply used in combination with a constant voltage / constant current variable DC power supply device comprising a monitor output terminal, a current monitor output terminal, an output voltage setting input terminal, and an output current setting input terminal,
a) a detection current input terminal connected to a current monitor output terminal of the constant voltage / constant current variable DC power supply;
b) a constant voltage setting output terminal connected to the output voltage setting input terminal of the constant voltage / constant current variable DC power supply;
c) an output power setting input terminal for externally applying a voltage corresponding to the target output power value;
d) calculating the control voltage by dividing the voltage value applied to the output power setting input terminal by the voltage value input from the detection current input terminal or multiplying the result of division by a predetermined value; An arithmetic processing unit to be applied to the constant voltage setting output terminal;
It is characterized by having.

The first aspect of the constant power variable DC power supply system according to the present invention, which has been made to solve the above problems, is the constant power output power supply circuit unit device according to the first or second aspect of the present invention. A constant power / constant voltage / constant current variable DC power supply system including a constant voltage / constant current variable DC power supply device,
The constant voltage / constant current variable DC power supply device turns on and off a DC voltage applied to a primary winding of a transformer by a switching element, and outputs an output voltage and an output through a rectifier circuit connected to the secondary winding of the transformer. A switching type power supply device that extracts current, a voltage detection unit that detects an output voltage and generates a voltage signal according to the output voltage, and a current detection that detects an output current and generates a voltage signal according to the current A first error amplification amplifier that calculates a difference signal between the voltage signal from the voltage detection unit and the voltage signal input from the output voltage setting input terminal, and the voltage signal from the current detection unit and the output current setting. A second error amplification amplifier that calculates a difference signal from the voltage signal input from the input terminal, and a constant current in the constant voltage mode based on the difference signal from the first error amplification amplifier. And a PWM control unit that generates a pulse signal for driving the switching element based on a difference signal from the second error amplification amplifier, and a voltage signal from the voltage detection unit is output to the voltage monitor output terminal. The voltage signal from the current detector is output to the current monitor output terminal,
A voltage monitor output terminal of the constant voltage / constant current variable DC power supply device and a detection voltage input terminal of the circuit unit device for constant power output power supply are detachably connected, and the constant voltage / constant current variable DC power supply device The constant current setting output terminal of the constant power output power supply circuit unit device is detachably connected, and the constant voltage / constant current variable DC power supply device is in constant current mode during constant power output. The current monitor output terminal of the constant voltage / constant current variable direct current power supply device and the detection current input terminal of the circuit unit device for constant power output power supply are detachably connected, and the constant voltage / An output voltage setting input terminal of the constant current variable DC power supply device and a constant voltage setting output terminal of the circuit unit device for constant power output power supply are detachably connected, and the constant voltage / constant current is output during constant power output. Variable DC power supply device is characterized in that it is operated in a constant voltage mode.

The second aspect of the constant power variable direct-current power supply system according to the present invention, which has been made to solve the above-mentioned problems, is the constant power output power circuit unit device of the first aspect according to the present invention, and a constant current. A constant power variable DC power supply system including a variable DC power supply device,
The constant current variable DC power supply device turns on and off a DC voltage applied to a primary winding of a transformer by a switching element, and extracts an output voltage and an output current through a rectifier circuit connected to the secondary winding of the transformer. A switching type power supply device, a voltage detection unit that detects an output voltage and generates a voltage signal according to the voltage, a current detection unit that detects an output current and generates a voltage signal according to the current, An error amplification amplifier that calculates a difference signal between a voltage signal from the current detection unit and a voltage signal input from the output current setting input terminal, and a pulse signal that drives the switching element based on the difference signal from the error amplification amplifier. A PWM control unit to generate, and a voltage signal from the voltage detection unit is output to the voltage monitor output terminal,
A voltage monitor output terminal of the constant current variable DC power supply device and a detection voltage input terminal of the circuit unit device for constant power output power supply are detachably connected, and an output current setting input terminal of the constant current variable DC power supply device And the constant current setting output terminal of the circuit unit device for constant power output power supply are detachably connected, and the constant current variable DC power supply device is operated to perform constant current control during constant power output. Yes.

The third aspect of the constant power variable direct-current power supply system according to the present invention, which has been made to solve the above problems, is the constant power output power circuit unit device according to the second aspect of the present invention, and the constant voltage. A constant power variable DC power supply system including a variable DC power supply device,
The constant voltage variable DC power supply device turns on and off a DC voltage applied to a primary winding of a transformer by a switching element, and takes out an output voltage and an output current through a rectifier circuit connected to the secondary winding of the transformer. A switching type power supply device, a voltage detection unit that detects an output voltage and generates a voltage signal according to the voltage, a current detection unit that detects an output current and generates a voltage signal according to the current, An error amplification amplifier that calculates a difference signal between a voltage signal from the voltage detection unit and a voltage signal input from the output voltage setting input terminal, and a pulse signal that drives the switching element based on the difference signal from the error amplification amplifier. A PWM control unit for generating, and a voltage signal from the current detection unit is output to the current monitor output terminal,
A current monitor output terminal of the constant voltage variable DC power supply device and a detection current input terminal of the circuit unit device for constant power output power supply are detachably connected, and an output voltage setting input terminal of the constant voltage variable DC power supply device And a constant voltage setting output terminal of the circuit unit device for constant power output power supply are detachably connected, and the constant voltage variable DC power supply device is operated to perform constant voltage control during constant power output. Yes.

  A generally used constant voltage / constant current variable DC power supply device has a voltage monitor output terminal for outputting a monitor voltage signal proportional to an output voltage detected in the device, and an output detected in the device. A current monitor output terminal for outputting a monitor voltage signal proportional to the current, an output voltage setting input terminal for inputting a signal for controlling the voltage value of the constant voltage output from the outside, and a current value of the constant current output from the outside An output current setting input terminal to which a signal for controlling the input is input. The circuit unit device for constant power output power supply according to the present invention uses these external terminals, receives a signal from either the voltage monitor output terminal or the current monitor output terminal, performs a predetermined arithmetic processing, and outputs the result as an output current. By feeding back to the setting input terminal or the output voltage setting input terminal, the constant voltage / constant current variable DC power supply device having no constant power control circuit is caused to function as a constant power variable DC power supply device.

  In the circuit unit device for constant power output power supply according to the first aspect of the present invention, the arithmetic processing unit is output from the voltage monitor output terminal of the constant voltage / constant current variable DC power supply device and passes through the detection voltage input terminal of the unit device. By dividing the voltage value for output power setting given to the output power setting input terminal by the input voltage value, the set value of the constant power output is converted into the set value of the constant current. Then, the control voltage that is the result of the division or multiplied by a predetermined value is input to the output current setting input terminal of the constant voltage / constant current variable DC power supply device through the constant current setting output terminal. As a result, when the constant voltage / constant current variable DC power supply device is operated in the constant current mode, the output power corresponds to the set value set at the output power setting input terminal of the circuit unit device for constant power output power supply. The constant current control is performed so that the output current and the output voltage with constant power are obtained.

  Further, in the circuit unit device for constant power output power supply according to the second aspect of the present invention, the arithmetic processing section is output from the current monitor output terminal of the constant voltage / constant current variable DC power supply device and is detected current input terminal of the unit device. By dividing the voltage value for setting the output power given to the output power setting input terminal by the voltage value input from, the constant power output setting value is converted to a constant voltage setting value. Then, a control voltage that is the result of division or multiplied by a predetermined value is input to the output voltage setting input terminal of the constant voltage / constant current variable DC power supply device through the constant voltage setting output terminal. Thus, when the constant voltage / constant current variable DC power supply device is operated in the constant voltage mode, the output power corresponds to the set value set at the output power setting input terminal of the circuit unit for constant power output power supply. Constant voltage control is performed so that the output current and output voltage are constant.

  That is, when the constant power output power supply circuit unit device according to the first and second aspects of the present invention and the generally used constant voltage / constant current variable DC power supply device are combined, the constant power output power supply Since the set value of output power is converted to the set value of constant voltage or constant current in the circuit unit device, the constant voltage / constant current variable DC power supply device does not change the constant power while executing constant voltage control or constant current control. Output voltage and output current equivalent to those controlled can be obtained.

  The substantial circuit in the circuit unit device for constant power output power supply according to the first and second aspects of the present invention is only the arithmetic processing unit except for the power supply circuit and the like. It only includes the added amplifier circuit. Accordingly, the circuit configuration of the circuit unit device for constant power output power supply is very simple, and its cost can be easily suppressed. In addition, the components required for such a circuit are small, and the circuit unit device for constant power output power supply can be made small and lightweight.

  In many cases, the voltage of each external terminal in the constant voltage / constant current variable DC power supply is determined as an industry standard so that it is 10 V when the output voltage and the output current are each a predetermined rated value. Yes. Therefore, the rated input voltage at the output power setting input terminal may be set to 10V.

  For example, a general-purpose analog multiplier such as AD633 manufactured by Analog Devices has a configuration in which 1/10 is multiplied so that the result of multiplying two inputs of X and Y becomes 10V full scale. Therefore, when a division circuit is configured using this general-purpose analog multiplier, the division result of 10V full scales is (10V / 10V) × −10 = −10V. By multiplying the value obtained by this division circuit by a gain of −1 by an inverting amplifier using an operational amplifier and converting it to + 10V, an output with a value corresponding to the rated voltage or the rated current of 10V is constant voltage / constant. The current variable DC power supply can be provided.

  Further, when the voltage of each external terminal in the constant voltage / constant current variable DC power supply device is such a power supply device that is set to 5 V when the output voltage and the output current have predetermined rated values, The division result is, for example, (5V / 5V) × −10 = −10V in AD633. Therefore, the value obtained by the division circuit may be multiplied by gain = −0.5 and converted to +5 V, and can be easily handled by changing the value of the resistor that determines the gain of the inverting amplifier by the operational amplifier. That is, according to the above configuration, a constant power output power supply circuit unit device suitable for combination with a generally used constant voltage / constant current variable DC power supply device can be realized with a simple circuit configuration.

  According to the circuit unit device for constant power output power supply according to the present invention, the unit device is connected to the outside of the generally used constant voltage / constant current variable DC power supply device, so that the constant power is supplied from the power supply device. Controlled output voltage and output current can be obtained. Therefore, for example, a user who already owns a general constant voltage / constant current variable DC power supply device can output constant power when a load requiring constant power needs to be driven. It is only necessary to newly obtain the constant power output power circuit unit device according to the present invention without purchasing a new power device. The circuit unit device for constant power output power supply according to the present invention can be used regardless of the output specifications of a general constant voltage / constant current variable DC power supply device to be connected.

  Since the circuit configuration of the circuit unit device for constant power output power source according to the present invention is simple and its cost is much lower than that of the DC power source device itself, it already has a general constant voltage / constant current variable DC power source device. Users can construct a constant power variable DC power supply system at low cost. Further, since the circuit unit device for constant power output power source according to the present invention is small and light, a system combined with a constant voltage / constant current variable DC power source device fits in almost the same size and weight as the device itself.

  The constant power variable DC power supply system according to the present invention includes a low-cost constant power output power supply circuit unit device as described above, a switching type constant voltage / constant current variable DC power supply device that is generally used, Alternatively, since it is connected to a switching type variable DC power supply device having either a constant voltage control function or a constant current control function, a constant voltage / constant current variable DC power supply with a constant power control function, a constant voltage A variable DC power supply or a constant current variable DC power supply can be provided at low cost. Further, in the circuit unit device for constant power output power source according to the present invention, in order to use the constant current control circuit or constant voltage control circuit built in the constant voltage / constant current variable DC power supply device for constant power control, There is no need for an error amplifier for constant power control. Therefore, in the constant power variable DC power supply system according to the present invention, there is no control interference caused by using an error amplification amplifier different from that for constant current control or constant voltage control, so that troublesome control matching adjustment is not required. It is. When constant voltage control or constant current control is required instead of constant power control, the circuit unit device for constant power output power supply can be removed from the constant voltage / constant current variable DC power supply device, and handling is easy. .

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the power supply system which combined the constant power output circuit unit apparatus which is one Example of this invention, and the constant voltage / constant current variable DC power supply generally used. The figure which shows an example of the detailed circuit of the arithmetic processing part in the circuit unit apparatus for constant power outputs shown in FIG. The figure which shows the other structural example of the power supply system which combined the circuit unit apparatus for constant power outputs which is one Example of this invention, and the constant voltage / constant current variable DC power supply generally used.

Hereinafter, a constant power output circuit unit device according to an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic configuration diagram of a power supply system in which a constant power output circuit unit device 10 according to this embodiment is combined with a switching type constant voltage / constant current variable DC power supply device 100 that is generally used. FIG. 2 is a diagram showing an example of a detailed circuit of the arithmetic processing unit 18 in the constant power output circuit unit device 10 in FIG.

  As shown in FIG. 1, a constant voltage / constant current variable DC power supply device 100 includes a rectifying unit 102 including a diode bridge that converts AC power input from an external AC power supply 200 to DC, and a smoothed rectified voltage. Capacitor 104, switching element 106 for turning on and off the AC-DC converted voltage, transformer 108, rectifying diodes 110 and 112, smoothing filter 114 including an inductor and a capacitor, and supply to load 210 Current detector 116 that detects the output current that is output and outputs it as a voltage signal proportional to the current value, and voltage detection that detects the output voltage applied to the load 210 and outputs it as a voltage signal proportional to the voltage value 118, two error amplification amplifiers 122 and 124, and a PWM control unit 126.

  Further, the constant voltage / constant current variable DC power supply device 100 includes, in addition to output terminals 130 and 131 to which a load 210 is connected, a current monitor output terminal 132 from which a detection voltage by the current detector 116 is output as a current monitor signal CMOT; A voltage monitor output terminal 134 from which a voltage detected by the voltage detector 118 is output as a voltage monitor signal VMOT, an output current setting input terminal 133 for inputting a constant current set value CCSI in the constant current mode from the outside, and a constant from the outside. An output voltage setting input terminal 135 for inputting a constant voltage setting value CVSI in the voltage mode. The output voltage range of the current monitor output terminal 132 is 0 V to 10 V. When the output current is 0 A and the rated current, the output voltage of the current monitor output terminal 132 is 0 V and 10 V, respectively. Similarly, the output voltage range of the voltage monitor output terminal 134 is 0V to 10V. When the output voltage is 0V and the rated voltage, the output voltage of the voltage monitor output terminal 134 is 0V and 10V, respectively. Also, the set input voltage range of the output current setting input terminal 133 is 0V to 10V, and 0V and 10V are respectively input to the output current setting input terminal 133 when setting the output current to 0A and setting the rated current. That's fine. The set input voltage range of the output voltage setting input terminal 135 is also 0 V to 10 V, and 0 V and 10 V may be input to the output voltage setting input terminal 135 respectively when the output voltage is set to 0 V and the rated voltage is set. .

The constant voltage / constant current variable DC power supply device 100 can operate in a constant voltage mode or a constant current mode in a state where the constant power output circuit unit device 10 is not connected. In the constant voltage mode, an appropriate voltage is set to the output voltage setting input terminal 135, and this becomes a reference voltage for constant voltage output. In the constant voltage mode, constant voltage control is performed as follows.
The PWM control unit 126 outputs a pulse signal having a predetermined pulse width for turning on / off the switching element 106. The voltage that has been AC-DC converted by the rectifier 102 and the capacitor 104 is turned on / off by the switching element 106, whereby an electric current intermittently flows in the primary winding of the transformer 108. This current flowing in the primary winding induces a current in the secondary winding of the transformer 108, and the current is converted to a direct current by the diode 110, the smoothing filter 114, and the like. This direct current is supplied to the load 210 connected to the output terminals 130 and 131.

  The voltage detector 118 detects the output voltage and outputs a voltage corresponding to the output voltage. This voltage is input to the inverting input terminal of the error amplification amplifier 124, and an error signal corresponding to the difference from the reference voltage input to the non-inverting input terminal of the error amplification amplifier 124 is fed back to the PWM control unit 126. The PWM control unit 126 adjusts the pulse width of the pulse signal so that the error becomes zero (or a predetermined value). Specifically, for example, when the output voltage falls below a target voltage value corresponding to the reference voltage, the error signal generated by the error amplifier 124 increases, and the PWM control unit 126 increases the pulse width of the pulse signal. As a result, the current per unit time flowing through the primary winding of the transformer 108 increases and the output voltage also increases. By such feedback control, the output voltage supplied to the load 210 is maintained at a predetermined value, and constant voltage control is achieved.

  The operation in the constant current mode is basically the same except that the output current is detected instead of the output voltage, and the operation is the same as that in the conventional apparatus, and the description thereof is omitted.

  The constant power output circuit unit device 10 includes an arithmetic processing unit 18, and as external terminals, an output power setting input terminal 12, a detection current / detection voltage input terminal 14, a constant voltage / constant current setting output terminal 16, and Is provided. The detection current / detection voltage input terminal 14 is connected to the current monitor output terminal 132 of the constant voltage / constant current variable DC power supply apparatus 100, and the constant voltage / constant current setting output terminal 16 is connected to the constant voltage / constant current variable DC power supply apparatus 100. The output voltage setting input terminal 135 is connected. The output power setting input terminal 12 is supplied with a voltage in the range of 0 to 10 V as the constant power set value CWSI with respect to the output power (current, voltage) of 0 W to rated power.

  The arithmetic processing unit 18 divides the constant power set value CWSI by the voltage value (current monitor signal CMOT) input through the detection current / detection voltage input terminal 14, and sets the constant result as a control voltage to set the constant voltage / constant current. The output terminal 16 is given. As a circuit for performing such a division, a generally known circuit can be used. In this embodiment, a circuit as shown in FIG. 2 is used.

  In the circuit shown in FIG. 2, a divider circuit is configured by a combination of an analog multiplier 181 and two general operational amplifiers 182 and 183. The analog multiplier 181 is a one-chip IC manufactured by Analog Devices. AD633JN is used (see Non-Patent Document 4). The internal circuit configuration of the AD633JN is as shown in FIG. 2, and calculation of W = [{(X1-X2) (Y1-Y2)} / 10V] + Z is possible. That is, the multiplication result of X1−X2 and Y1−Y2 is divided by “10”. This is to prevent the multiplication result from exceeding the power supply voltage ± VSS.

  As illustrated in Non-Patent Document 4, a divider circuit can be configured by combining AD633JN and an operational amplifier (for example, AD711) as shown in FIG. At this time, in the circuit shown in FIG. 2, the voltage W ′ at the output terminal of the operational amplifier 182 becomes W ′ = − (10 V) (CWSI / X1), and the polarity is inverted by the inverting amplifier using the operational amplifier 183 to be constant. The voltage / constant current setting output terminal 16 outputs (10V) (CWSI / X1) (provided that Z = 0V). That is, it is possible to realize division by dividing the constant power set value CWSI by the voltage value (current monitor signal CMOT) input through the detection current / detection voltage input terminal 14. In this case, the result of the division is multiplied by 10V inside the AD633JN. Here, since the voltage corresponding to the rated value of both the constant power set value CWSI and the current monitor signal CMOT is 10V, the result of the division is obtained. When it is multiplied by 10, the full scale of the division result can be exactly 10V. This conforms to the fact that the voltage corresponding to the rated value of the constant voltage setting value CVSI to be output from the constant voltage / constant current setting output terminal 16 is 10 V, and the voltage value is outside the analog multiplier 181. Since adjustment is not necessary, it is convenient for simplifying the circuit.

  In the system shown in FIG. 1, when it is desired to supply a constant power controlled output to the load 210, the constant voltage / constant current variable DC power supply device 100 is operated in the constant voltage mode as described above. That is, the PWM control unit 126 adjusts the pulse width of the pulse signal so that the error signal from the error amplifier 124 becomes zero (or a predetermined value). At this time, the output voltage applied to the load 210 is detected by the voltage detector 118, and a voltage corresponding to the output voltage is input to the inverting input terminal of the error amplification amplifier 124. On the other hand, the output current supplied to the load 210 at this time is detected by the current detector 116, and a voltage corresponding to the output current is input to the arithmetic processing unit 18 of the circuit unit device 10 for constant power output as the current monitor signal CMOT. Is done.

An appropriate constant power set value CWSI is input to the output power setting input terminal 12, and the arithmetic processing unit 18 performs the division as described above. Since this division is a process of dividing the power value that is the target of constant power control by the current value that is actually supplied to the load 210, the set value of the constant power output is set according to the actual output current at that time. This corresponds to the process of converting to a constant voltage set value. Since the constant voltage set value CVSI converted in this way is input to the other end of the error amplifier 124 through the output voltage setting input terminal 135, the PWM control unit 126 receiving the error signal from the error amplifier 124 at that time The pulse width of the pulse signal is adjusted so that the output voltage becomes a voltage corresponding to the constant voltage set value CVSI. As a result, the output power determined by the output voltage and the output current is controlled to be a constant power corresponding to the constant power set value CWSI.
As described above, in the power supply system in which the constant power output circuit unit device 10 of this embodiment is combined with the constant voltage / constant current variable DC power supply device 100, the constant voltage control in the constant voltage / constant current variable DC power supply device 100 is performed. The power supplied to the load 210 can be kept constant using the function. That is, constant power control is achieved.

  FIG. 3 is a diagram showing another configuration of a power supply system in which the constant power output circuit unit device 10 of the above embodiment and the constant voltage / constant current variable DC power supply device 100 that is generally used are combined. A part of the constant voltage / constant current variable DC power supply device 100 is not shown. The circuit unit device 10 for constant power output itself is exactly the same as that shown in FIGS. 1 and 2, but the mode of connection between the circuit unit device 10 for constant power output and the constant voltage / constant current variable DC power supply device 100. Is different from FIG. That is, the detection current / detection voltage input terminal 14 and the constant voltage / constant current setting output terminal 16 of the circuit unit device 10 for constant power output are the voltage monitor output terminal 134 and the output of the constant voltage / constant current variable DC power supply device 100, respectively. The current setting input terminal 133 is connected.

  In this case, the constant voltage / constant current variable DC power supply device 100 is operated in the constant current mode. Therefore, the PWM control unit 126 adjusts the pulse width of the pulse signal so that the error signal from the error amplifier 122 becomes zero (or a predetermined value). At this time, the output current supplied to the load 210 is detected by the current detector 116, and a voltage corresponding to the output current is input to the inverting input terminal of the error amplification amplifier 122. On the other hand, the output voltage applied to the load 210 at this time is detected by the voltage detector 118, and the voltage corresponding to the output voltage is input to the arithmetic processing unit 18 of the constant power output circuit unit device 10 as the voltage monitor signal VMOT. Is done.

  The arithmetic processing unit 18 performs division based on the input signal so as to convert the set value of the constant power output into the set value of the constant current according to the actual output voltage at that time. The converted constant current set value CCSI is input to the non-inverting input terminal of the error amplification amplifier 122, and the PWM control unit 126 receiving the error signal from the error amplification amplifier 122 outputs the current at that time as the constant current set value. The pulse width of the pulse signal is adjusted so that the voltage corresponds to CCSI. Thereby, also in the configuration shown in FIG. 3, the output power determined by the output voltage and the output current is controlled to be a constant power corresponding to the constant power set value CWSI.

  As described above, the circuit configuration in the arithmetic processing unit 18 is not limited to the example shown in FIG. Further, it is not always necessary to use an analog circuit, and arithmetic processing by software using a microcomputer may be used. Further, the same function may be realized in hardware by a logic circuit instead of software.

  In the above embodiment, a constant power variable DC power supply system is constructed by combining a constant power output circuit unit device according to an embodiment of the present invention and a generally used constant voltage / constant current variable DC power supply device. However, the constant power output circuit unit device according to the present embodiment is combined with a constant voltage variable DC power supply device having a function only for constant voltage control or a constant current variable DC power supply device having a function only for constant current control. Obviously, they can be combined.

  Further, the above embodiment is merely an example of the present invention, and it is obvious that changes, modifications, or additions can be made as appropriate within the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Circuit unit apparatus for constant power output 12 ... Output power setting input terminal 14 ... Detection current / detection voltage input terminal 16 ... Constant voltage / constant current setting output terminal 18 ... Operation processing part 181 ... Analog multipliers 182, 183 ... Operational amplifier DESCRIPTION OF SYMBOLS 100 ... Constant voltage / constant current variable DC power supply device 102 ... Rectifier 104 ... Capacitor 106 ... Switching element 108 ... Transformer 110, 112 ... Diode 114 ... Smoothing filter 116 ... Current detector 118 ... Voltage detector 122, 124 ... Error amplification Amplifier 126 ... PWM controller 130, 131 ... Output terminal 132 ... Current monitor output terminal 133 ... Output current setting input terminal 134 ... Voltage monitor output terminal 135 ... Output voltage setting input terminal 200 ... AC power supply 210 ... Load

Claims (5)

Constant voltage / constant current variable DC mode with constant voltage mode and constant current mode as operation modes, and with voltage monitor output terminal, current monitor output terminal, output voltage setting input terminal, and output current setting input terminal as external terminals A circuit unit device for constant power output power supply used in combination with a power supply device,
a) a detection voltage input terminal connected to a voltage monitor output terminal of the constant voltage / constant current variable DC power supply;
b) a constant current setting output terminal connected to the output current setting input terminal of the constant voltage / constant current variable DC power supply;
c) an output power setting input terminal for externally applying a voltage corresponding to the target output power value;
d) calculating a control voltage by dividing a voltage value applied to the output power setting input terminal by a voltage value input from the detection voltage input terminal or multiplying a result of division by a predetermined value; An arithmetic processing unit to be given to the constant current setting output terminal;
A circuit unit device for constant power output power supply comprising: Constant voltage / constant current variable DC mode with constant voltage mode and constant current mode as operation modes, and with voltage monitor output terminal, current monitor output terminal, output voltage setting input terminal, and output current setting input terminal as external terminals A circuit unit device for constant power output power supply used in combination with a power supply device,
a) a detection current input terminal connected to a current monitor output terminal of the constant voltage / constant current variable DC power supply;
b) a constant voltage setting output terminal connected to the output voltage setting input terminal of the constant voltage / constant current variable DC power supply;
c) an output power setting input terminal for externally applying a voltage corresponding to the target output power value;
d) calculating the control voltage by dividing the voltage value applied to the output power setting input terminal by the voltage value input from the detection current input terminal or multiplying the result of division by a predetermined value; An arithmetic processing unit to be applied to the constant voltage setting output terminal;
A circuit unit device for constant power output power supply comprising: A constant power variable DC power supply system comprising the constant power output power supply circuit unit device according to claim 1 or 2 and a constant voltage / constant current variable DC power supply device.
The constant voltage / constant current variable DC power supply device turns on and off a DC voltage applied to a primary winding of a transformer by a switching element, and outputs an output voltage and an output through a rectifier circuit connected to the secondary winding of the transformer. A switching type power supply device that extracts current, a voltage detection unit that detects an output voltage and generates a voltage signal according to the output voltage, and a current detection that detects an output current and generates a voltage signal according to the current A first error amplification amplifier that calculates a difference signal between the voltage signal from the voltage detection unit and the voltage signal input from the output voltage setting input terminal, and the voltage signal from the current detection unit and the output current setting. A second error amplification amplifier that calculates a difference signal from the voltage signal input from the input terminal, and a constant current in the constant voltage mode based on the difference signal from the first error amplification amplifier. And a PWM control unit that generates a pulse signal for driving the switching element based on a difference signal from the second error amplification amplifier, and a voltage signal from the voltage detection unit is output to the voltage monitor output terminal. The voltage signal from the current detector is output to the current monitor output terminal,
A voltage monitor output terminal of the constant voltage / constant current variable DC power supply device and a detection voltage input terminal of the circuit unit device for constant power output power supply are detachably connected, and the constant voltage / constant current variable DC power supply device The constant current setting output terminal of the constant power output power supply circuit unit device is detachably connected, and the constant voltage / constant current variable DC power supply device is in constant current mode during constant power output. The current monitor output terminal of the constant voltage / constant current variable direct current power supply device and the detection current input terminal of the circuit unit device for constant power output power supply are detachably connected, and the constant voltage / An output voltage setting input terminal of the constant current variable DC power supply device and a constant voltage setting output terminal of the circuit unit device for constant power output power supply are detachably connected, and the constant voltage / constant current is output during constant power output. Constant power variable DC power supply system, characterized in that the variable DC power supply device is operated in a constant voltage mode. A constant power variable DC power supply system comprising the constant power output power supply circuit unit device according to claim 1 and a constant current variable DC power supply device,
The constant current variable DC power supply device turns on and off a DC voltage applied to a primary winding of a transformer by a switching element, and extracts an output voltage and an output current through a rectifier circuit connected to the secondary winding of the transformer. A switching type power supply device, a voltage detection unit that detects an output voltage and generates a voltage signal according to the voltage, a current detection unit that detects an output current and generates a voltage signal according to the current, An error amplification amplifier that calculates a difference signal between a voltage signal from the current detection unit and a voltage signal input from the output current setting input terminal, and a pulse signal that drives the switching element based on the difference signal from the error amplification amplifier. A PWM control unit to generate, and a voltage signal from the voltage detection unit is output to the voltage monitor output terminal,
A voltage monitor output terminal of the constant current variable DC power supply device and a detection voltage input terminal of the circuit unit device for constant power output power supply are detachably connected, and an output current setting input terminal of the constant current variable DC power supply device And a constant current setting output terminal of the circuit unit device for constant power output power supply are detachably connected, and the constant current variable DC power supply device is operated to perform constant current control during constant power output. Constant power variable DC power supply system. A constant power variable DC power supply system comprising the constant power output power circuit unit device according to claim 2 and a constant voltage variable DC power supply device,
The constant voltage variable DC power supply device turns on and off a DC voltage applied to a primary winding of a transformer by a switching element, and takes out an output voltage and an output current through a rectifier circuit connected to the secondary winding of the transformer. A switching type power supply device, a voltage detection unit that detects an output voltage and generates a voltage signal according to the voltage, a current detection unit that detects an output current and generates a voltage signal according to the current, An error amplification amplifier that calculates a difference signal between a voltage signal from the voltage detection unit and a voltage signal input from the output voltage setting input terminal, and a pulse signal that drives the switching element based on the difference signal from the error amplification amplifier. A PWM control unit for generating, and a voltage signal from the current detection unit is output to the current monitor output terminal,
A current monitor output terminal of the constant voltage variable DC power supply device and a detection current input terminal of the circuit unit device for constant power output power supply are detachably connected, and an output voltage setting input terminal of the constant voltage variable DC power supply device And a constant voltage setting output terminal of the circuit unit device for constant power output power supply are detachably connected, and the constant voltage variable DC power supply device is operated to perform constant voltage control during constant power output. Constant power variable DC power supply system.

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