JPS63296113A - Dc power unit - Google Patents

Abstract

PURPOSE:To keep current balancing at a stable state and to supply a constant voltage to a load, by correcting a reference voltage to be supplied from a reference voltage source to first and second error amplifiers so as to set a current detected in a current detection circuit at a desired ratio. CONSTITUTION:The reference voltage is corrected so as to keep the current balancing without performing voltage control and current balancing control with two separate control loops. In other words, the first and second error amplifiers 17a and 17b are always set at operating states in spite of a current balancing state, and both first and second voltage control circuits go to states to decrease their output voltages (load voltages) when the output voltage is increased. Adversely, when the output voltage is decreased, both the first and second voltage control circuits go to the states to increase their output voltages. In such a way, it is possible to prevent the remarkable fluctuation of the ratio of the current arrotment of the first and second voltage control circuits, that is the current balancing state, from being generated, and to accelerate response speed in the current balancing control when the output voltage is fluctuated.

Description

[Detailed description of the invention]

[Industrial application field] Voltage vN orange circuit that connects a dropper such as a transistor to the 4 lines to control the DC output voltage at a constant voltage, or DC output with a DC-DC converter A voltage regulator circuit that controls the voltage at a constant voltage, a voltage rectifier circuit that controls the DC output voltage at a constant voltage using a combination of an inverter and a rectifier circuit, or a similar circuit connected in parallel to supply DC power to a common load. Supply reflow*source fIt#/C
related. [Prior art] A dropper consisting of a transistor is connected in series to a current W source line, and a voltage adjustment circuit configured to stabilize the output voltage by adjusting the voltage of the dropper is connected in parallel, and each voltage control loop is connected in parallel. There is a well-known method in which a current balance control loop is provided and parallel operation is performed so that the load current is equally shared. [Problems to be Solved by the Invention] By the way, in a conventional parallel circuit, a constant voltage control loop and a current balance control loop are provided independently, and one voltage adjustment circuit and the other voltage adjustment circuit in the parallel circuit have a constant voltage control loop. Iil+
If the control loop fails, the current balance control loop stops operating, and conversely, if the current balance control loop is in operation, the voltage control loose stops operating. When the output voltage changes in such a parallel circuit, the constant voltage control loop that is not operating starts operating and makes the output voltage constant. As a result, an imbalance of ti occurs, and this current imbalance causes the current to change. Controlled by a balance control loop. ti is balanced. For this reason, the Ilfm delay fi in the case where the current R is balanced after the output voltage changes is large, resulting in poor responsiveness. Now, dropper method constant voltage 1! Although the description has been made regarding the dwarf circuit of the source circuit, the same problem also exists in the dwarf circuit of the constant voltage W source circuit whose voltage is adjusted by a DC-DC converter, an inverter, or the like. SUMMARY OF THE INVENTION An object of the present invention is to provide a parallel connection circuit of voltage adjustment circuits that can balance currents immediately or within a short period of time when the output voltage changes. [Means for Solving the Problems] The first invention of the present application for solving the above problems and achieving the above objects is capable of constant voltage in response to the output of the first error amplifier described later. RT? [a first voltage regulating circuit that forms an output voltage and supplies it to the first voltage regulator; a first voltage detecting circuit connected to the output terminal of the first voltage regulating circuit; a first reference voltage source for making the voltage at the output terminal of the adjustment circuit a constant value; and a first reference voltage source connected to the first voltage detection circuit and the first reference voltage source;
The first detection voltage obtained from the voltage detection circuit of
A first error amplifier supplies an output corresponding to the difference between the reference voltage of ml obtained from a reference voltage source of ml as a constant voltage control signal to the voltage adjustment circuit of i1, and responds to the output of a second error amplifier described later. a second voltage regulator whose output terminal is connected to the output terminal of the first voltage regulator; a second voltage detection circuit connected to the output terminal of the second voltage adjustment circuit; and a second voltage detection circuit connected to the output terminal of the second voltage adjustment circuit;
is connected to the second voltage detection path and the second reference voltage source. The second voltage adjustment circuit uses an output corresponding to the difference between the detection voltage of WJ2 obtained from the second voltage detection circuit and the second reference voltage obtained from the second reference voltage as a constant voltage control signal. a second error amplifier for supplying m-current power to the η load in both the @] voltage regulating circuit and the I@2 voltage regulating circuit; The first and second current detection circuits detect each output current of the second voltage adjustment circuit or the internal current corresponding to each output current, and the current detected by the first and second current detection circuits detects the desired current. a circuit for correcting at least 10,000 of the first and second reference voltages supplied from the first and second reference voltage sources to the first and second error amplifiers so that the ratio The present invention relates to a DC power supply device characterized by the following. A second invention of the present application provides that the main hair portion is the same as the first invention, and the first and second current detection circuits are arranged so that the currents detected by the first and second current detection circuits are in a desired ratio. The present invention relates to a DC power supply circuit characterized in that it is provided with a circuit for controlling the detection voltage of No. 2. [Function] In the invention No. 1-i1 above, voltage control and current balance control are not performed in two independent control loops, but only the reference voltage is corrected to balance the current. The first and second error amplifiers 17a and 17b are always in operation regardless of the current balance state, and the output voltage C
91 load voltage) increases, both the voltage adjustment circuits of wJl and WJ2 enter an operating state that lowers the output voltage, and conversely, when the output voltage decreases, both the first and second voltage adjustment circuits It enters an operating state that increases the output voltage. Therefore, despite fluctuations in the output voltage, there is no significant change in the current balance state due to the ratio of current sharing between the first and second 11FEtl rectifying circuits. With just one converter, the response speed of current balance control when the output voltage fluctuates is extremely fast. Also in the second invention, voltage control and current balance control are not performed in two independent control loops, but only the detected voltage is corrected to balance the currents.
The first and second error terms 17a, 17b are always in operation. Therefore. The same effects as the first invention can be obtained. Embodiment of (1!)] Next, a DC power supply device according to a first embodiment of the present invention shown in Figure !1 will be explained.This DC type device has a first DC constant voltage power supply circuit It consists of a parallel connection circuit of a first unit (hereinafter referred to as the first unit) and a second DC constant voltage power supply circuit 2 (hereinafter referred to as the second unit). , a pair of output terminals 5.6 for outputting a stabilized DC output voltage, and a common connection terminal 7 for current balance control. Similarly, the second unit 2 has a pair of input terminals connected to the DC power supply. 8.9, a pair of output terminals 10.11 for outputting a stabilized DC output voltage, and a common connection terminal 12 for current balance control. The input terminals 8.9 of the two units 2 are connected to an independent unbalanced current or a common DC power source.The output terminals 5.6 of the first and second units 1.2 10.
11 are connected in parallel with each other and connected to a common fence #J13. WJ] and the common connection terminal 7.12 of the second unit 1.2 are commonly connected. Between the input terminal 3 and the output terminal 5 of the first unit 1/(
Transistor as dropper of voltage adjustment circuit] 4a
are connected in series. A voltage detection resistor 15a of ml is connected between the output terminals 5 and 6 as a first voltage detection circuit.

【ing. This first voltage detection resistor 15a (7
) The first detection voltage output line 16a is connected to the inverting input terminal of a first error amplifier 17a consisting of an arithmetic tank. A reference voltage source 19a of wJl is connected between the non-inverting input terminal of the first error amplifier 17a and the lower output terminal 6 via a reference voltage correction resistor 18a. Therefore, the output terminal of the first error amplifier 17a is connected to the line ]6a.
A voltage corresponding to the difference between the detected voltage obtained from the reference voltage source 9a and the first base S* pressure given from the reference voltage source 9a is obtained as a voltage control signal. The output terminal of the error amplifier 17a is connected to the diode 20a.
It is connected to the pace of the transistor 14a as the main control element via the transistor 14a. IfC is connected between the collector and base of the transistor 14a, a resistor 2]a for supplying a pace current. The first unit 1 further includes a first 'w1 current measurement detection resistor 22a connected between the input terminal 4 and the output terminal 6 as a first current detection circuit in order to detect and control the current balance. First operational term for balance detection and control #
A device 23a, first current balance detection resistor 24a
, a reference voltage correction resistor 25a, and a diode 26a. The non-inverting input terminal of the first arithmetic tank 23a is connected to the left end of the current detection resistor 22a, the first inverting input terminal is connected to the left end of the current detection resistor 22a via the first balance detection resistor 24a, and the output The terminal is diode 26
a and a reference voltage correction resistor 25a to the non-inverting input terminal of the first error amplifier 17a. In addition, the lower end of the current balance detection resistor 24a is connected to the common connection terminal 7.
Connected to Vc. The second unit 2 includes a second transistor 14b. Second voltage detection resistor 15b, voltage detection line] 6b, second error amplifier] 7b, reference voltage correction resistor] 8b, second reference voltage source] 9b, diode 20b, resistor 21b
, second current detection resistor 22b. It consists of a second operational amplifier 23b, a second current balance detection resistor 24b, a base S voltage correction resistor 25b, and a diode 21'ib, and is connected the same as the wJ1 unit l.
has been done. The internal configuration of the second unit 2 is completely the same as that of the first unit 1. (Since the internal configuration of the second unit 2 is the same as that of the first unit 1, the same reference numerals are given to the IR1 elements that have the same function.
, 2, a suffix a is added to the reference number of the first unit 1. A suffix is added to the reference number of the second unit 2, and a detailed explanation of the second unit 20 will be omitted. [Operation] If the first unit 1 and the second unit 2 are not connected in parallel, the first and twentieth operational amplifiers 23
The current balance detection and correction circuits included in a and 23b' have no function. Therefore, a typical constant voltage control operation is performed by the first and second error amplifiers 17a and 17b. Further, when the diode 26a is off, the first reference voltage source 19aσ and the first reference voltage ■a are applied to the first error amplifier 17a without being corrected. When the diode 2fib is off, the second reference voltage of the i@20 reference voltage 11i5L19b is not corrected and the second error amplifier 17
Be given to b. By the way, it is practically impossible to set the output voltages of the first and second units to be exactly the same. If the output voltage of the first unit 1 is set to be higher than the output voltage of the second unit 2, then first
The value of the current supplied from unit 1 to load 3 becomes larger than the value of the current supplied from second unit 2 to load 3. As a result, the voltage drop across the first current detection resistor 22a becomes larger than the voltage drop across the second current detection resistor 22b, and the first P at the left end of the current detection resistor 22a of
The potential at point a is lower than the potential at point pb at the left end of the second current detection resistor 22b. Point Pa and point Pb are connected through the current balance detection resistors 24a and 24b, so the current flows from point pb, which has a high potential, to point Va, which has a low potential, through the resistor 24b and the resistor 24a, and flows through the arrow 27a. , 27
Flow T as shown in b

[ru. When a current flows in the direction of the arrow 27a through the first current balance detection resistor 24a. This means that the potential of the inverting input terminal of the first operational amplifier 23a is higher than the potential of the non-inverting input terminal. Therefore, the output voltage Ea of the operational amplifier 23a of @ is at a low level (zero volts), and the diode 26a is turned off. - If the current in the direction shown by the arrow 27b flows through the second current balance detection resistor 24b, the potential of the non-inverting input terminal of the second operational term @G23b is higher than the potential of the inverting input terminal. Since the output voltage Eb is high, this output voltage Eb becomes a high level, and this output voltage Eb is the reference voltage source 19b.
When the voltage becomes higher than the voltage vb, the diode 26b becomes conductive, and the reference voltage is corrected. That is, the operational amplifier 23b
The voltage difference between the output voltage Eb and the reference voltage vb (Eb-V
b)' divided by resistors 18b and 25b is the reference voltage V
b K ZFll is calculated, and rt is applied as a correction reference voltage to the error amplifier 17b. When a corrected reference voltage higher than the voltage vb of the reference voltage source 19b occurs, the output potential of the second error amplifier 17b becomes high and becomes 0. Bypassing of the base current through the diode 20b is reduced and the base voltage & of the 1 m2 transistor 14b is increased, the output current of the second unit 2 is increased, and the output currents of the first and m2 units 12 are balanced. Contrary to the above, when the output voltage of the second unit 2 is set higher than the output voltage of the first unit 1, the current flowing through the first and second current balance detection resistors 24a and 24b is opposite to the arrows 27a and 27b, the output of the second operational amplifier 23b becomes a low level, the diode 26b is turned off, and conversely the output of the first operational amplifier 2
Output Ea of 3a is false, level and diode 2fi
a is turned on, and the correction reference voltage (reference voltage Va K Ea −V
(The value obtained by adding the voltage obtained by dividing a by resistors 18a and 25a)
is the non-inverting input terminal [7JD] of the first error amplifier 17a, this output potential becomes high, the bypass of the base current decreases, the pace current of the first transistor 14a increases, and the current of the first unit 1 increases. The output current also increases, and the currents of the first and 1iR2 units] and 2 are balanced. After all, the output voltage of the parallel connection is determined by the output voltage of the unit whose output voltage is higher (the one set).
The setting of the output voltage of the 10,000 unit whose output voltage is set low is automatically corrected so as to obtain the same output voltage as the output voltage of the 10,000 unit whose output voltage is set high. However, the diode 26a. If the polarity of 26b is reversed, the unit whose output voltage is set low will be subordinated to the unit whose output voltage is set high. The operation when the output voltage changes due to fluctuations in the load 13, etc. is as follows.
This is the same as the conventional constant voltage control operation, and the detection voltage and the reference voltage or correction reference voltage are connected to the first and second error amplifiers 17.
transistor 14a so that the output voltage returns to a predetermined value. 14b is controlled. One important thing here is the operational amplifier 23a for current balance detection and correction. 23b does not qualitatively change. That is, the reference voltage and the corrected reference voltage do not substantially change. In the conventional circuit, the first and second operational amplifiers 23a, 2
The output terminal of 3b is connected to a transistor 14a. 14b to adjust the current balance. Further, the conventional circuit is configured such that only one of the error amplifiers 17a and 17b for voltage control and the operational amplifiers 23a and 23b for current balance is operated. and an operational amplifier 23a for current balance. 23b, as in the case of the present invention shown in FIG.
, 17b violates the inactive state. Therefore, when a fluctuation occurs in the output voltage. The voltage vI4 regulating differential amplifier 17a or 17b in the non-operating state is changed to the operating state, the voltage is adjusted, the current balance also changes, and then current balance control is performed, so that the current is balanced when the voltage changes. The disadvantages are that it takes a long time to complete the process and the response speed of current balance control is slow. (On the other hand, in the circuit of FIG. 1 according to the present invention, the two error amplifiers 17a and 7b are always in operation, so when the output voltage changes, the voltage is adjusted immediately and the first E
Since the output voltages of the second unit 1.2 and 1.2 both change in the same direction, there is almost no change in the current balance, and the desired current balance can be quickly obtained. [Second undercurrent side] Next, FIG. 2 showing a DC power supply device according to a second embodiment of the present invention will be described. However, in Fig. m2, components having substantially the same functions as those in Fig. 1 are given the same reference numerals and their explanations are omitted. Furthermore, since the internal configurations of the first unit 1a and the second unit 2a in FIG.
Subscript a to distinguish from a. b will be attached to each reference number, and the explanation of one will be omitted. The DC power supply shown in FIG. 2 has first and second voltage regulating circuits each comprising a DC-DC converter connected in parallel. Therefore, the first voltage adjustment circuit includes a switching transistor 30a, a transformer 3]a, a Dfi smoothing circuit 32a, a comparator 33a, and a triangular wave voltage generation circuit 3.
4a, a phototransistor 35a, a resistor 36a1, and a light emitting diode 43a. To explain each part in more detail, h @ current voltage t on φ transistor 30ai) as a switching element for turning off 5th transistor 31a
is connected between a pair of input terminals 3.4 via a primary winding 37a. The secondary winding 38a of the transformer 3]a is connected to the output terminal 5.6 by connecting the rectifying and smoothing circuit @32a emitted from the diodes 39a, 40a, the reactor 41a, and the capacitor 42a. ml error amplifier 1
A light emitting diode 43a is connected between the positive output terminal 5 and the output terminal of the first error amplifier 17a to control the on/off of the transistor 30a based on the output of the transistor 7a.
is connected, and this light emitting diode 43a is optically coupled to the phototransistor 35a. Since the phototransistor 35aa is connected between the positive power supply terminal +V and the input terminal 4 via the resistor 36a,
A divided voltage output based on the resistance value of the phototransistor 35a and the value of the resistor 36a is applied to the inverting input terminal of the comparator 33a. A triangular wave generation circuit 34a is connected to the non-inverting input terminal of the comparator 33a.
Since the output terminal of a is connected to the base of the transistor 30a, a pulse width modulation (PWM) signal is formed based on the comparison between the triangular wave voltage generated from the triangular wave generating circuit 34a and the control voltage given based on the phototransistor 35aK. The transistor 30al) is turned on and off in response to a PWM signal. By turning on and off the transistor 30a, a constant output voltage is obtained between the output terminals 5 and 6. Therefore, in FIG. 1, a voltage regulating circuit is constructed in which the transistor 14a is used as a drawer, whereas in FIG. 2, the voltage regulating circuit obtains a constant voltage by controlling the oscillating transistor 30a on and off. Comparing the two, it's 1! Although the pressure adjustment method is different, they are the same in that voltage control is performed using the output of the error amplifier 17a. The present invention is applicable regardless of changes in the contents of the voltage adjustment circuit. In FIG. 2, a first current detection circuit 44a is provided in place of the current detection resistor 22a in FIG. 1st
Although it is of course possible to provide the current detection resistor 22a in the same way as shown in the figure, in order to eliminate power loss caused by this, the primary current of the current transformer 45a is connected to the collector line of the transistor 30a through which a current corresponding to the output current flows. Connect the winding 46a,
The current detection circuit 44a is configured by connecting a full-wave rectifier circuit 48a consisting of four diodes to the next winding 47a, and connecting a smoothing capacitor 49a and a resistor 50a between a pair of output lines of the rectifier circuit 48a. There is. Cort
Therefore, the transistor 30avc#L:t is connected to the resistor 50a.
It is possible to obtain a voltage corresponding to the current that is 'L'. Therefore, the resistor 50a in FIG. 2 applies the same voltage to the current balance detection circuit 11!3 as the current detection resistor 22a in FIG. 1. The lower end of the current detection resistor 50a is connected to the common connection terminal 7, and the upper end is connected to the lower end of the current balance detection resistor 24a and the inverting input terminal of the first operational amplifier 23a. The output terminal of the first operational amplifier 23a in FIG. 2 is connected to the reference voltage source 19a through resistors 25a and 18a as in FIG.
Although it is possible to make a K connection, in the embodiment shown in FIG.
0a to the lower end of the voltage detection resistor 15a. In addition. A detected voltage correction resistor 51a is connected between the lower end of the voltage detection resistor 15a and the output terminal 6. [Operation] Now, if the output voltage of the first unit Ia is set higher than the output voltage of the m2 unit 2a, then the output current of the first unit hla is higher than the output current of the WIJ2 unit 2a. becomes large, and t obtained at the first current detection resistor 50a

If the current detection voltage obtained at the second current detection resistor 50b is larger than the current detection voltage obtained at the second current detection resistor 50b,
a, arrow 53a to a closed circuit consisting of resistor 50b, resistor 24b, and resistor 24a. A current flows in the direction indicated at 53b. Since the first and @2 balance detection resistors 24a and 24b are connected between the pair of input terminals of the first and second operational amplifiers 23a and 23b, respectively, the operational amplifier 23a of INl is
It operates by inputting the voltage across the resistor 24a based on the electric current in the direction of 3a, and outputs a high level voltage. As a result, the diode 26a is turned off and the first operational amplifier S2
It is in a state separated from the 3atr voltage detection circuit. −
Ten thousand. Operational amplifier 23b of wJ2 operates to generate a low level output voltage based on the voltage available across resistor 24b, causing diode 26'b to conduct. As a result, the lower end of the second voltage detection resistor 15b is pulled in the negative direction, and a corrected detection voltage is applied from the line 16b to the inverting input terminal of the second error amplifier 17b. Since this corrected detection voltage is lower than the detection voltage before correction, the output of the second Wakizashi amplifier 17b becomes high, the light emission ft of the second light emitting diode 43b decreases, and the resistance of the second phototransistor 35b increases. As a result, the potential of the inverting input terminal of the comparator 33b becomes lower Q, and the width of the PWM pulse obtained from the output terminal of the comparator 33b becomes larger. The on-width of the transistor 30b also increases, and the output current increases, and the output currents of the first and second units hla and 2a are corrected so that the balance state is good.The current balance is corrected. When a change in the output voltage occurs later, the first and second error amplifiers 17a and 17b are both in operation, as in FIG. 1, so the voltage immediately changes to !1.
MJ adjustment is done. Therefore, in the circuit INI of FIG. 2, substantially the same effect as that of the circuit of FIG. 1 can be obtained. [Third Embodiment] Next, a third embodiment of the DC Il source device according to the m3 embodiment of the present invention will be described. However, in FIG. 3, elements having substantially the same functions as those in FIG. 1 and the second tooth are given the same reference numerals, and their explanations will be omitted. Also, part 3
Since the internal configurations of the first unit lb and the second unit 2b of rItJ are the same. Same S component KF! The subscript a is used to distinguish between the first unit 1b and the second unit 2b.
, b1 are attached to each reference number, and the explanation of -7 is omitted. The DC power supply system fIt in FIG. 3 is one in which first and second voltage adjustment circuits each consisting of a DC-DC converter are connected in parallel. Therefore, in many parts w,2rkJ and m3 follicles are identical. The difference between Figure 2 and Figure 3 is the first part of Figure 2.
and a second error amplifier] 7a. 17 kl' The transistor 17 cannot be left unanswered by the operational amplifier.
a, 17b, and the lower ends of the current detection resistors 50a, 50b are connected to the diodes 26a, 26b and the resistor 51a without providing anything corresponding to the first and second operational terms Il@converters 23a, 23btt in FIG. 51b is valved and connected to the lower ends of the voltage detection resistors 15a, 15b, and the reference voltage sources 19a, 19b are shown as Zener diodes. ′! l! The current balance detection resistor 24abK is connected in parallel with diodes 548 and 54b for bypassing the current.

【ing. Zener diode 19a,]9
b cathode and output terminal 5. ] 0, a resistor 55a,
55b is connected to T[. Light-emitting diodes 43a and 43b are connected between the collectors of the transistors 17a and 17b as error amplifiers and the output terminal 5.10 via resistors ζi. [Operation] In the first unit 1bVc, the voltage detected by the voltage detection resistor 15a is compared with the reference voltage I given by the Zener diode 9a by the transistor 17a. If the output voltage becomes higher than a predetermined value, the resistance value of the transistor 17a decreases and the 1 light emitting diode 43
The current of a and the light emitting cap increase, and the phototransistor 35a
The resistance value of the transistor 30a decreases, the potential of the inverting input terminal of the comparator 33a increases, the width of the PWM pulse becomes narrower, and the duty ratio of the transistor 30a becomes 'F9. The output voltage does not decrease toward a predetermined value. The constant voltage control operation of the second unit 2b is also exactly the same as that of the first unit hlb. By the way, it is impossible to make the output voltage settings of both devices exactly the same. Now, if the output voltage of the first unit lb is set high, the output ilr current supplied from the first unit lb to the load 13 and the current flowing to the current transformer 45a will be equal to that of the second unit 2b. greater than etc. Therefore, the current detection voltage obtained by the first current detection resistor 50aVc is higher than the current detection voltage obtained by the second current detection resistor 50bK. Flow balance detection resistor 24b. A current flows through the closed circuit consisting of the second current detection resistor 50b. At this time, the current flowing through the second current balance detection resistor 24b has the direction of the arrow 53b. As a result, the second
The potential at the lower end of the current balance detection resistor 24b decreases,
The diode 26b is turned on, the voltage at the lower end of the voltage detection resistor 15b falls, and the potential of the pressure detection line 16b also falls, the pace current of the transistor 17b decreases, the current and light emission amount of the first light emitting element 43b also decrease, and the photo transistor 3
5b increases, the potential of the inverting input terminal of the comparator 33b decreases, and the width of the PWM pulse becomes wider (V
% The duty ratio of the transistor 30b increases, the output current increases, and the output current of the first and second units 1b and 2b becomes static. On the other hand, in the *] unit 1b, the diode 54a
Since the direction of the current of the current and the current of the first current balance detection resistor 24b having a slight current TL is as shown by the arrow 53a, the diode 26aG? It becomes like a reverse bias and is kept in the off state. If the set voltage of the second unit 2b is higher than the second unit b, then the operation is opposite to that described above. If the load voltage fluctuates while the current is balanced, the constant voltage control circuit formed by the transistors 17a and 17b is in operation, so it immediately responds and operates to maintain the output voltage at a predetermined level. When the voltages of the first and second units 1b and 2b are controlled in the same direction (both up or down), the direction of current flow in the current balance detection circuit does not reverse, so 1! A predetermined balance condition is immediately obtained after pressure adjustment. [Modifications] The present invention is not limited to the above-described embodiments. For example, the following transformations are possible. fi+ The voltage adjustment circuit portion formed by the transistors 14a and 14b in FIG. 1 is replaced by the transistors 30a and 3 in FIG.
0b, balance 3 ] a, 3 l b, can be replaced with a D C-DC cony y hake consisting of rectifying and smoothing circuits 32a and 32b. +21 In the circuit of FIG. 1, the outputs of the first and second operational amplifiers 23a and 23b for current balance detection control are connected to the voltage detection resistor 1 using resistors as in the case of FIG.
Connect to the lower ends of 5a and 15b. 'I! The detected voltage may be corrected so that the current is balanced. (3) The voltage adjustment port 8 portion of the DC-DC converter in FIGS. 2 and 3 is replaced by the transistors 14a and 14 in FIG.
It may be replaced with a voltage adjustment circuit using a dropper according to b. In this case, current transformer 45a. 45b is replaced with a direct current transformer (DCCT). (4; Transistor 14a, ]4b part in Figure 1, Dc-4)e converter part in Figures 2 and 3,
It can be replaced with a combination circuit of an inverter 60 and a rectifier circuit 6 shown in FIG. The voltage adjustment port w1 in FIG. 4 is a direct current t#! It is constructed by connecting a bridge circuit of four 621C transistors 63, 64, and 65.6fi, and connecting a rectifier port %6 to the output of a transformer 67. Each transistor 63,
64, 65, and 66 are connected to the PWM control circuit 68. The control circuit M68 includes a phototransistor 35a shown in FIG.
Also, a phototransistor 35 corresponding to a35b is connected. This phototransistor 35 is controlled based on the error output between the output detection voltage and the reference voltage. Current transformer 45
has the same function as current transformer 45a or 45b in FIG. (5) The voltage control circuit portion includes the circuit Vcll! shown in FIGS. 1 to 4. ! Kotona (, self-excited rooting type DC-DC:
Any voltage regulation can be used, such as ff'/hark, converters using FETs, etc. 16: The directions of the diodes 26a and 26b in FIGS. 1, 2, and 3 may be reversed. When connected in this way, 1, for example, the first unit], ]a, 1
If the output set voltage of b is higher than that of the second units 2.2a, 2b, the respective diodes 26a are turned on, and in FIG. 1 the first reference voltage is corrected to be lower. In FIGS. 2 and 3, the first detection voltage is corrected to be higher. As a result, the output voltage of the first unit 1°]a, ]b and the second unit 2.2a, 2b is low (the one set is high) (the one that is set is subject to the control). (2nd unit set low) 2.2
Based on the settings of a and 2b (self-defense voltage can be obtained. Note that 1 m
In FIG. 3, the directions of the diodes 54a and 54b are also reversed at the same time. (7; It is applicable not only to two voltage regulating circuit units but also to cases in which 23 or more units are connected in parallel. [Effects of the Invention] As is clear from the above (1) In the present invention, the first and second Since the voltage control loop based on the error amplifier is always operating, voltage control is executed immediately when output voltage fluctuation occurs, and there is no significant change in the current balance correction state.Therefore, the current balance is stabilized. It is possible to supply a constant voltage to nine loads while maintaining the same state.

[Brief explanation of drawings]

FIG. 1 shows m-current electric body armor f1 according to the first embodiment of the present invention.
1. Circuit diagram shown in FIG. FIG. 2 is a circuit diagram showing a DC power supply device according to a second embodiment of the present invention. FIG. 3 is a circuit diagram showing a DC power supply device according to a third embodiment of the present invention. FIG. 4 is a circuit diagram showing a voltage adjustment port wI of a modified example. 1...First unit, 2...Second unit, 73.
・・9 charges, 14 a =・first transistor, 1
4b: Second transistor, 15a: First voltage detection resistor. 15b...Second voltage detection resistor, 17a...First error amplifier, 17b...Second error amplifier, 18a. 18b--resistance for reference voltage correction, 19a--first
Reference voltage source,] 9b...Second reference voltage source, 22a
...first current detection resistor, 22b...second current detection resistor, 23a...first operational amplifier, 23b...
2nd operational amplifier, 24a... first current balance detection resistor, 24b... second current balance detection resistor, 25a, 25b... reference voltage correction resistor.

Claims (1)

[Scope of Claims] [1] A first voltage adjustment circuit that responds to the output of a first error amplifier (described later) to form a constant DC output voltage and supplies this to a load; a first voltage detection circuit connected to the output terminal of the first voltage adjustment circuit; a first reference voltage source for making the voltage at the output terminal of the first voltage adjustment circuit a constant value; is connected to the voltage detection circuit and the first reference voltage source, and a first detection voltage obtained from the first voltage detection circuit and a first reference voltage obtained from the first reference voltage source are connected to each other. a first error amplifier that supplies an output corresponding to the difference as a constant voltage control signal to the first voltage adjustment circuit; and a second error amplifier (to be described later), which generates a constant DC output voltage in response to the outputs thereof. and a second voltage regulating circuit which supplies this to the load and whose output terminal is connected to the output terminal of the first voltage regulating circuit; and an output terminal of the second voltage regulating circuit. a second voltage detection circuit connected to the second voltage detection circuit; a second reference voltage source for making the voltage at the output terminal of the second voltage adjustment circuit a constant value; is connected to a reference voltage source, and controls an output at a constant voltage corresponding to a difference between a second detected voltage obtained from the second voltage detection circuit and a second reference voltage obtained from the second reference voltage source. a second error amplifier that supplies a signal to the second voltage regulation circuit, and a DC power supply device that supplies DC power to the load using both the first voltage regulation circuit and the second voltage regulation circuit. , first and second current detection circuits that detect each output current of the first and second voltage adjustment circuits or an internal current corresponding to each output current; and detection by the first and second current detection circuits. correcting at least one of the first and second reference voltages supplied from the first and second reference voltage sources to the first and second error amplifiers so that the current that is applied to the error amplifier becomes a desired ratio; A DC power supply device comprising a circuit for. [2] A first voltage adjustment circuit that responds to the output of a first error amplifier (described later) to form a constant DC output voltage and supplies this to a load; a first voltage detection circuit connected to an output terminal; a first reference voltage source for making the voltage at the output terminal of the first voltage adjustment circuit a constant value; the first voltage detection circuit and the is connected to a first reference voltage source, and outputs an output corresponding to a difference between a first detected voltage obtained from the first voltage detection circuit and a first reference voltage obtained from the first reference voltage source. A regulated DC output voltage is formed in response to the outputs of a first error amplifier and a second error amplifier (described later), which are applied as a constant voltage control signal to the first voltage adjustment circuit, and this is applied to the load. a second voltage regulation circuit whose output terminal is connected to the output terminal of the first voltage regulation circuit; and a second voltage regulation circuit whose output terminal is connected to the output terminal of the second voltage regulation circuit. a voltage detection circuit; a second reference voltage source for making the voltage at the output terminal of the second voltage adjustment circuit a constant value; and connected to the second voltage detection circuit and the second reference voltage source. and output corresponding to the difference between the second detection voltage obtained from the second voltage detection circuit and the second reference voltage obtained from the second reference voltage source as a constant voltage control signal to the second voltage detection circuit. and a second error amplifier for supplying DC power to a voltage adjustment circuit, and supplies DC power to the load using both the first voltage adjustment circuit and the second voltage adjustment circuit, first and second current detection circuits that detect each output current of the second voltage adjustment circuit or an internal current corresponding to each output current; and a circuit for correcting at least one of the first and second detection voltages supplied from the first and second voltage detection circuits to the first and second error amplifiers so that the ratio is the same. A DC power supply device characterized by: