JP2560612Y2 - CV / CC DC stabilized power supply - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CV / CC stabilized DC power supply, and is particularly suitable for stabilizing a voltage source and a current source output with a single power supply by sharing a voltage and current control power supply.
CV / CC DC stabilized power supply.

[0002]

2. Description of the Related Art Conventionally, many CV / CC stabilized DC power supplies having a block diagram shown in FIG. 4 have been provided. In the figure, 1 and 2 are input terminals of a CV / CC stabilized DC power supply to which a rectified DC voltage source is applied, 3 is a voltage and current control circuit of the CV / CC stabilized DC power supply, and 4 is a control circuit 3. An OR circuit for controlling, 5 is a CC comparison error amplifier for detecting a control signal at the time of CC operation, 6 is a CV comparison error amplifier for detecting a control signal at the time of CV operation, 8 is a current source ground and A is shown in a triangle. 9 is a reference voltage generating circuit for current control composed of an A / REF volume VR1, 10 is a reference voltage generating circuit for voltage control composed of a V / REF volume VR2, and 11 is a voltage source ground.
Indicated by writing V in the mark, 12 is a voltage divider that generates a control signal during CV operation, and 13 is a load of a CV / CC DC stabilized power supply.
Expressed as _RL .

Reference numeral 21 denotes a current control reference voltage generating circuit 9.
A reference voltage for current control (hereinafter, abbreviated to A.REF) which is an output of the reference voltage generator 22 is an output of the reference voltage generation circuit 10 for voltage control, and a reference voltage for voltage control (hereinafter, represented by V.REF), R Is a current detection resistor, r is a current source ground 8 and a voltage source ground 11
E1 is the power supply for current control to create AREF21, E2 is the power supply for voltage control to create VREF22,
I _OUT and V _OUT are the output current and output voltage of the CV / CC stabilized DC power supply, + OUT and -OUT are the output terminals of the CV / CC stabilized DC power supply,
+ S and -S are remote sensing terminals of CV / CC stabilized DC power supply.

When the CV / CC DC stabilized power supply operates at CC, A.REF2
1 and a detection voltage detected by the current detection resistor R are compared and detected by a CC comparison error amplifier 5, and an output control signal of the CC comparison error amplifier 5 is transmitted through an OR circuit 4 to a control circuit 3 configured on a current output line. It can control and stabilize the CC operation of CV / CC DC stabilized power supply.

During CV operation, V.REF22 and output voltage V _OUT
Is divided by a voltage divider 12 and supplied to a CV comparison error amplifier 6 where the divided potential is compared and detected so as to be the same potential as the voltage source ground 11, and an output control signal of the CV comparison error amplifier 6 is ORed. By controlling the control circuit 3 provided on the voltage output line via the line 4, the CV operation of the CV / CC DC stabilized power supply can be stabilized.

The A.REF 21 is made up of a current control power source E1 based on the current source ground 8 and an A.REF volume VR1, and V.REF22 is a voltage control power source based on the voltage source ground 11. It is made up of E2 and V-REF volume VR2.

Further, a short bar connecting the remote sensing terminals + S, -S and the output terminals + OUT, -OUT (FIG. 1)
By connecting the remote sensing terminals + S, -S to the _RL load 13 terminal.
A remote sensing function is provided for correcting a voltage drop due to a resistance component caused by a wiring connected to the _RL load 13 from the output terminals + OUT and -OUT.

[0008]

However, the above-mentioned conventional stabilized CV / CC DC power supply has a resistance r such as a wiring existing between the current source ground 8 and the voltage source ground 11.
The output current I _OUT causes a potential difference Vr = r * I _OUT between the current source ground 8 and the voltage source ground 11.

For this reason, the CV / CC stabilized DC power supply requires two independent current and voltage control power supplies E1 and E2, respectively.
In order to produce these control power supplies E1 and E2, two sets of power transformer secondary windings, rectifier diodes, smoothing capacitors, three-terminal regulators, etc. are required, and the cost of parts increases.
There was a disadvantage that it was impossible to reduce the size of the set.

When a single control power supply forms a CV / CC DC stabilized power supply, for example, when a control power supply is formed with reference to a voltage source ground 11, a voltage between the current source ground 8 and the voltage source ground 11 is obtained. The potential difference Vr causes an error in the current feedback system control. Conversely, if a control power supply is formed based on the current source ground 8, the potential difference Vr appears as an error in the voltage feedback system control.

The present invention has been made in view of the above points, and aims at solving the disadvantages of the prior art, and adding an adder (or subtractor) to the A-REF and V-REF circuit systems. Another object of the present invention is to provide a CV / CC stabilized DC power supply that can be provided to stabilize and control CV / CC operation with a single control power supply.

[0012]

The CV / CC stabilized DC power supply of the present invention has a reference voltage for voltage control based on a voltage source ground and a reference voltage for current control based on a current source ground. In a CV / CC stabilized DC power supply capable of stabilizing the constant voltage source output or constant current source output and operating in CV / CC, a control power supply based on the voltage source ground and voltage control with this control power supply A reference voltage generating circuit for generating a reference voltage for current control and a reference voltage for current control, and an adder for adding the reference voltage for current control and the current source ground, and the output of the adder is based on the voltage source ground. It is configured to be an apparent current control reference voltage.

Also, a control power supply based on the current source ground, a reference voltage generation circuit for generating a voltage control reference voltage and a current control reference voltage with the control power supply, and the voltage control reference voltage and the voltage A subtracter for subtracting the current source ground from the source ground, and an output of the subtracter may be an apparent voltage control reference voltage based on the current source ground.

[0014]

According to the invention, one control power supply is provided with reference to the voltage source ground, and the control power supply is used to control the voltage control reference voltage and the current control reference voltage in the respective volumes of the reference voltage generation circuit. The current control reference voltage and the current source ground are added by an adder to generate an apparent current control reference voltage based on the voltage source ground.

This apparent current control reference voltage is supplied to a CC comparison error amplifier, and is compared with a current detection voltage with respect to a voltage source ground generated by a current detection resistor R and a resistance component r. A control signal can be supplied to the control circuit via the OR circuit to control the output current.

On the other hand, the divided voltage signal of the voltage divider is generated by the voltage control reference voltage with respect to the voltage source ground as in the conventional example.
The voltage is supplied to the CV comparison error amplifier, and the output control signal of the CV comparison error amplifier can stabilize the constant voltage.

In another embodiment, a single control power supply is provided with reference to a current source ground, and the control power supply supplies a voltage control reference voltage and a current control reference voltage to a reference voltage generation circuit. The voltage control reference voltage and the voltage source ground are subtracted by a subtractor to generate an apparent voltage control reference voltage based on the current source ground. The reference voltage can be supplied to the CV comparison error amplifier via the voltage divider to perform a constant voltage stabilization operation.

On the other hand, as in the conventional example, stabilization can be performed by constant current control using a current control reference voltage with respect to the current source ground.

As described above, with one control power supply, the voltage control reference voltage (or the apparent voltage control reference voltage) and the current control reference voltage (or the apparent voltage control reference voltage) with respect to the current source ground or the voltage source ground. Constant voltage control and constant current control using the current control reference voltage) to stabilize the DC voltage or current.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a CV / CC DC stabilized power supply according to the present invention will be described with reference to FIGS. The same parts as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 1 shows an embodiment in which only one voltage control power supply E2 is provided for the voltage source ground 11, and a current control reference in which an A-REF volume VR1 is connected to the voltage control power supply E2. Voltage generation circuit 9 and V / REF volume VR
2 is connected to form a voltage control reference voltage generation circuit 10.
FIG. 3 is a block diagram of a CV / CC stabilized DC power supply. In the figure, reference numeral 7 denotes an adder for adding a current source ground 8 and A.REF 21. FIG. 3 shows an embodiment of an adder 7 using an operational amplifier IC. FIG.

FIG. 2 shows another embodiment in which only one current control power supply E1 is provided for the current source ground 8, and the current control power supply E1 is connected to an A / REF volume VR1. Reference voltage generation circuit 9 and V / REF volume
FIG. 2 is a block diagram of a CV / CC DC stabilized power supply in which a voltage control reference voltage generation circuit 10 connected to VR2 is formed, and 14 is a subtracter for subtracting a voltage source ground 11 and V · REF22.

One voltage control power source E2 is connected to a voltage source ground.
In the CV / CC DC stabilized power supply (in the case of FIG. 1) formed with respect to 11, the CV comparison error amplifier 6 during the CV operation is set by the V / REF volume VR2 of the voltage control reference voltage generating circuit 10.
The voltage divider 12 divides V.REF22 and the output voltage _{VOUT in the same} manner as in the conventional example, and the output of the voltage divider 12 controls the control circuit 3 via the OR circuit 4 to stabilize the output DC voltage of the CV operation. can do.

On the other hand, during CC operation, A.REF 21 which is the set voltage of A.REF volume VR1 of the reference voltage generator 9 for current control.
Is added by the adder 7 to the potential of the current source ground 8 and supplied to the CC comparison error amplifier 5. The potential of the current source ground 8 is the potential between the current source ground 8 and the voltage source ground 11 generated by the output current I _OUT flowing through the resistance r such as the wiring.
Vr.

The CC comparison error amplifier 5 has a current detection resistor R
And the potential generated by the output current I _OUT flowing through the resistance r and the output potential of the adder 7, that is, the potential difference Vr
, An apparent current control reference voltage 20 (apparent A.REF21 = A.REF'20) is supplied, and the output signal of the CC comparison error amplifier 5 controls the control circuit 3 through the OR circuit 4. The constant current output of the CC operation can be stabilized by controlling the potential generated by the output current I _OUT flowing through the current detection resistor R and the resistance component r so as to be equal to the A.REF'20. .

In the adder 7 shown in FIG.
And A · REF'20 are as follows. A · REF '= (1 + R4 / R3) * {R2 / (R1 + R2)} * (A · REF + Vr) Where R1 = R2, R3 = R4, A · REF' = A · REF + Vr. That is, the potential of the current source ground 8 is higher than the potential of the voltage source ground 11 by the potential difference Vr, and this A · REF′20 (based on the voltage source ground 11) is A · REF based on the current source ground 8. REF (formed by a current control power supply E1 provided on a current source ground 8 and an A-REF volume VR1 in the conventional example)
A.REF), which indicates that there is no error due to the potential difference Vr in the constant current control.

The OR circuit 4 has a CV / CC DC stabilized power supply of CV
During operation, only the control signal from the CV comparison error amplifier 6 is supplied to the control circuit 3. During CC operation, only the control signal from the CC comparison error amplifier 5 is supplied to the control circuit 3.
It operates to perform each voltage and current control.

The CV / CC stabilized DC power supply shown in FIG. 2 is provided with one current control power supply E1 based on the current source ground 8, and a current for outputting A.REF21 from the current control power supply E1 as shown in FIG. A control reference voltage generation circuit 9 and a voltage control reference voltage generation circuit 10 for outputting V.REF22 are formed.

When the CV / CC stabilized DC power supply operates in the CC mode, A.REF21 is supplied to the CC comparison error amplifier 5 to perform constant current stabilization control as in the conventional example.
V-REF22, current source ground 8 and voltage source ground 11
The potential Vr between them is supplied to the subtractor 14, and the apparent voltage control reference voltage 23 obtained by subtracting the potential difference Vr from VREF22, that is, the apparent voltage control reference voltage 23 (VREF ') is Formula V ・ R
EF'23 = V · REF22-Vr.

V.REF'23 is lower than V.REF22 based on the voltage source ground 11 by a potential difference Vr, and is added / subtracted from A.REF'20 in FIG. Is reversed. This V.REF'23 is divided by the voltage divider 12 and supplied to the CV comparison error amplifier 6, and the control circuit 3 is controlled via the OR circuit 4 to stabilize the constant voltage as described above.

As described above, in either of the circuit configurations of FIG. 1 and FIG. 2, the control of the CV / CC DC stabilized power supply can be similarly performed by one control power supply.

[0032]

[Effects of the Invention] As described above, the CV / CC DC stabilized power supply according to the present invention is composed of a single control power supply for A.REF (A.REF ') and
V ・ REF (V ・ REF ') can be created and CV or CC operation can be stabilized, so the number of parts in the circuit configuration can be significantly reduced, reducing material costs and miniaturizing sets. There is an effect that it is possible.

In addition, it has excellent features such as simple structure and easy implementation because it can be constructed at low cost.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a stabilized CV / CC DC power supply according to the present invention.

FIG. 2 is a block diagram showing another embodiment.

FIG. 3 is a circuit diagram showing a circuit of the adder of FIG. 1;

FIG. 4 is a block diagram showing a conventional example.

[Explanation of symbols]

3 Control circuit 4 OR circuit 5 CC comparison error amplifier 6 CV comparison error amplifier 7 Adder 8 Current source ground 9 Current control reference voltage generation circuit 10 Voltage control reference voltage generation circuit 11 Voltage source ground 12 Voltage divider 13 Load (R _L ) 14 Subtractor 20 Apparent current control reference voltage (A ・ REF ') 21 Current control reference voltage (A ・ REF) 22 Voltage control reference voltage (V ・ REF) 23 Apparent voltage control reference Voltage (V ・ REF ') R Current detection resistor r Resistance E1 Current control power supply E2 Voltage control power supply VR1 A ・ REF volume VR2 V ・ REF volume

Claims (2)

(57) [Scope of request for utility model registration] 1. A constant voltage source output or a constant current source output stabilizing, comprising a voltage control reference voltage based on a voltage source ground and a current control reference voltage based on a current source ground. And a control power supply based on a voltage source ground, and a reference voltage generator for generating a voltage control reference voltage and a current control reference voltage with the control power supply. A circuit, and an adder for adding the current control reference voltage and the current source ground, wherein the adder output is configured to be an apparent current control reference voltage based on the voltage source ground. A stabilized CV / CC DC power supply. 2. A control power supply based on a current source ground, a reference voltage generation circuit for generating a voltage control reference voltage and a current control reference voltage with the control power supply, and the voltage control reference voltage and the voltage. 2. A CV · CV according to claim 1, further comprising a subtracter for subtracting the current from the power source ground, wherein the output of the subtractor is an apparent voltage control reference voltage based on the current source ground. CC DC stabilized power supply.