JP2000278935A - Power supply - Google Patents

Abstract

(57) [Problem] To provide a stable power supply voltage to a load device by effectively eliminating the influence of a transient voltage drop due to the line resistance of a wiring. A power supply wiring is provided in a correction circuit.
In a state where no voltage drop occurs due to the above, the fluctuation of the drive voltage due to the load current generated from the load device 21 is detected using the voltage Vref such that the DC voltage applied to the load device 21 is constant, and based on the detection result, Error voltage amplifier 1
02 controls the DC / DC converter circuit 101
To suppress the fluctuation of the driving voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device used for a system in which power consumption fluctuates transiently, such as a radar device.

[0002]

2. Description of the Related Art Conventionally, for example, in a power supply device used for a radar device, output stabilization measures are taken so that a power supply voltage does not fluctuate due to an excessive pulse current generated in a load device at the time of pulse transmission. Is given.

FIG. 3 shows a configuration of a conventional power supply device. In FIG. 3, reference numeral 10 denotes a power supply device, which is a load device 21 which operates on DC power and generates a load current.
And power supply wirings 31 and 32 to supply driving power to the load device 21. Such a power generator 1
0 is DC / DC (DC / DC) for converting unstable DC power to a required voltage of the load device 21 based on a given control voltage.
DC) converter circuit 101 and error voltage amplifier 102
And an amplifier 103. The DC voltage generated by the DC / DC converter circuit 101 is supplied to the load device 21 via the power supply wiring 31. Also, the load device 21
Is supplied to the amplifier 104 of the power supply generator 10 through the power supply wiring 32, is power-amplified, and is supplied to the DC / DC converter circuit 101 as a control voltage. Therefore, the DC / DC converter circuit 101
The DC voltage generated based on the output of the amplifier 104 is controlled.

In the above configuration, a large load current flows through the load device 21 during operation. At this time, a transient voltage drop occurs due to the line resistance of the inductance of the power supply wirings 31 and 32 between the power supply generator 10 and the load device 21, and the drive voltage fluctuates. In this case, the characteristics of the load device 21 are greatly affected.

For this reason, in the conventional power supply device, the remote sensing wirings 33 and 3 are connected to the power supply wirings 31 and 32, respectively.
4 are connected in parallel to absorb voltage fluctuations. A large-capacity smoothing electrolytic capacitor C1 having excellent high-frequency characteristics is connected between the output side of the DC / DC converter circuit 101 and the input side of the amplifier 103 to absorb voltage fluctuations. . Further, the fluctuating voltage generated by the remote sensing wirings 33 and 34 is
The error voltage is detected by the error voltage amplifier 102 via 1, R2 and R3. The output of the error voltage amplifier 102 is adjusted by the variable voltage adjuster 104 and supplied to the DC / DC converter circuit 101. Thereby, in the DC / DC converter circuit 101, the remote sensing wirings 33, 34
Is compensated for.

However, in the power supply device having the above configuration, there are problems such as that the remote sensing wirings 33 and 34 are combined with other cables in the same device, and that the remote sensing wires 33 and 34 are more susceptible to ingress of noise from outside the device. As a countermeasure for this, a voltage setting or the like is generally incorporated in the device, but adjustment time is wasted and adjustment is troublesome. Further, when the load is reduced, the output voltage increases, so that wasteful power is required.

[0007]

As described above, in the conventional power supply device, when it is used for a load device of a system in which power consumption fluctuates transiently, it not only affects the internal configuration of the entire device. There is also a problem that it is easily affected by external influences, and it takes a great deal of time and effort to set the voltage. Furthermore, when the load is reduced, the output voltage increases, so that there is a problem that wasteful power is required.

SUMMARY OF THE INVENTION An object of the present invention is to provide a remote sensing wiring, which does not use a remote sensing wiring, and which is affected by a transient voltage drop due to the line resistance of the wiring when the load current changes transiently and leads to a fluctuation in the power supply voltage. Is to provide a power supply device that can effectively eliminate and supply a stable power supply voltage to a load device.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a power supply unit for supplying drive power to a load device that operates on DC power and generates a load current. DC power generating means for generating power, a power supply wiring unit for supplying DC power generated by the DC power generating means to a load device, and taking in a load current generated from the load device, Voltage fluctuation control means for detecting a change in drive voltage due to a load current via a power supply wiring section, calculating a control voltage based on the detection result, and applying the control voltage to a DC power generation means.

According to this configuration, the fluctuation of the driving voltage due to the load current generated from the load device is detected, the control voltage is calculated based on the detection result, and the calculated control voltage is applied to the DC power generation means, thereby detecting the fluctuation of the driving voltage. Because it suppresses, a stable voltage can be supplied to the load device even when the drive voltage fluctuates, and even when the load is reduced, the fluctuation of the drive voltage when the load is reduced is detected, and the control according to the detection result is performed. Unnecessary power can be reduced by obtaining the voltage and applying it to the DC power generation means.

For compensating for fluctuations in the drive voltage, a state voltage value at which a voltage drop due to the power supply wiring does not occur is set in advance in the correction circuit, and the power supply is equivalently set based on the fluctuation in the drive voltage due to the load current in the correction circuit. This can be achieved by generating a correction output for correcting a voltage drop corresponding to the line resistance of the wiring portion, obtaining a control voltage based on the correction output by the error voltage amplifier, and applying the control voltage to the DC power generation means.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of a power supply device according to the present invention. In FIG. 1, the same parts as those in FIG. 3 are denoted by the same reference numerals, and detailed description will be omitted. In FIG. 1, reference numeral 40 denotes a power supply, which further includes a correction circuit 401 for controlling the error voltage amplifier 102 and the amplifier 103, instead of the variable voltage regulator 104. The correction circuit 401 includes the load device 2
A change in the drive voltage due to the load current generated from step 1 is detected, and a correction output corresponding to the change is generated. That is,
A correction output corresponding to the voltage drop corresponding to the line resistance of the power supply wiring 31 is generated.

FIG. 2 shows a specific configuration of the correction circuit 401. That is, the correction circuit 401 includes amplifiers 4011 and 4012 as shown in FIG. The amplifier 4011 amplifies a difference between a voltage corresponding to a load current generated from the load device 21 and a reference voltage (RTN), and amplifies the difference voltage between the amplifier 103 and the amplifier 4012.
To supply. The amplifier 4012 amplifies the difference between the output of the amplifier 4011 and a predetermined voltage Vref, and supplies the difference voltage to the error voltage amplifier 102 as a corrected output. The voltage Vref is set in advance so that the DC voltage applied to the load device 21 is constant in a state where no voltage drop occurs due to the power supply wires 31 and 32.

According to this configuration, when the load current increases, the voltage supplied to one input terminal of the amplifier 4012 becomes larger than the voltage Vref, and the voltage is supplied to the power supply line 31.
Amplifier 102 as a correction voltage corresponding to the voltage drop due to
Output to

As described above, according to the above-described embodiment, the voltage Vref is used such that the DC voltage applied to the load device 21 is constant in a state where the voltage drop due to the power supply wirings 31 and 32 does not occur in the correction circuit 401. Of the drive voltage due to the load current generated from the load device 21 and the control voltage is obtained by the error voltage amplifier 102 based on the detection result and applied to the DC / DC converter circuit 101 to suppress the change of the drive voltage. Therefore, a stable voltage can be supplied to the load device 21 even when the drive voltage fluctuates, without requiring a remote sensing wiring as in the related art. Also, at the time of load reduction, the correction circuit 401 detects a variation in the drive voltage at the time of load reduction, and the error voltage amplifier 102 obtains a control voltage according to the detection result to obtain a DC voltage.
By giving the power to the / DC converter circuit 101, unnecessary power can be reduced.

As for the suppression of the drive voltage fluctuation, the correction circuit 401 outputs a correction output for equivalently correcting the voltage drop corresponding to the line resistance of the power supply wires 31 and 32 based on the drive voltage fluctuation due to the load current. Generated and error voltage amplifier 1
In step 02, the correction output is compared with the output of the DC / DC converter circuit 101, and the difference voltage is amplified and applied to the DC / DC converter circuit 101.

In the above-described embodiment, the DC / DC converter circuit 101 is used as the DC power generation means, but may be other than the DC / DC converter circuit 101.

In addition, the configuration of the power supply generator, the configuration of the correction circuit, the configuration of the load device, and the type of the power supply wiring can be variously modified without departing from the gist of the present invention.

[0020]

As described in detail above, according to the present invention,
In cases where the load current changes transiently and leads to fluctuations in the power supply voltage, the effect of the transient voltage drop due to the line resistance of the wiring is effectively eliminated without using remote sensing wiring, and the load And a power supply device capable of supplying a stable power supply voltage.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a power supply device according to the present invention.

FIG. 2 is a circuit configuration diagram showing a specific configuration of the correction circuit shown in FIG. 1;

FIG. 3 is a block diagram showing a conventional power supply device.

[Explanation of symbols]

 10, 40 power supply device, 21 load device, 31, 32 power supply wiring, 33, 34 remote sensing wiring, 101 DC / DC converter circuit, 102 error voltage amplifier, 103 amplifier, 401 correction circuit .

Claims (4)

[Claims] 1. A power supply device for supplying drive power to a load device that operates with DC power and generates a load current, wherein the DC power generates DC power required by the load device based on a separately applied control voltage. Generating means; a power supply wiring section for supplying the DC power generated by the DC power generating means to the load device, and for taking in a load current generated from the load device; and driving by a load current generated in the load device. A power supply, comprising: voltage fluctuation detection means for detecting a voltage fluctuation via the power supply wiring section, calculating the control voltage based on the detection result, and applying the control voltage to the DC power generation means. apparatus. 2. The DC power generation means comprises a DC / DC converter circuit which inputs unstable DC power and converts it into a voltage required by the load device based on a control voltage given from the voltage fluctuation control means. The power supply device according to claim 1, wherein the power supply is performed. 3. The voltage fluctuation control means uses a correction circuit that generates a correction output corresponding to a change in drive voltage due to the load current, and a correction output of the correction circuit and an output of the DC power generation means. 2. The power supply device according to claim 1, further comprising: means for calculating a control voltage applied to said DC power generation means. 4. The correction circuit according to claim 3, wherein the correction circuit generates a correction output corresponding to a voltage drop corresponding to a line resistance of the power supply wiring section based on a change in a driving voltage due to the load current. Power supply.