JPS6225305A - Stabilized power source - Google Patents

Abstract

PURPOSE:To reduce the cost, size, and weight of a stabilized power source which has a large voltage and a large current by compressing the voltage variation of an AC input temporarily, and then utilizing the output and putting an unstabilized DC power source in charge of the majority of the output voltage. CONSTITUTION:The AC stabilized power source 1 suppresses the voltage variation of the AC input to 1-2% temporarily and its output is supplied to the unstabilized DC power source 2 and a low-voltage switching regulator 3. The unstabilized DC power source 2 outputs an unstabilized DC voltage of +25V as a reference voltage by using a normal smoothing circuit, etc., and the regulator 3, on the other hand, outputs a stabilized DC voltage of +3V as a reference voltage. Those two reference voltages are added together in series to develop an output voltage of 28V between output terminals 201 and 202. Then, when the output voltage of the DC power source 2 varies, the regulator 3 operates to compensate it.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a stabilized power supply device, and particularly to a stabilized power supply device that takes an unregulated AC power source as input and converts it to a stabilized DC power source having a predetermined voltage and current value. The present invention relates to a stabilized power supply device that outputs power.

[Conventional technology]

Stabilized DC voltage power supplies are widely used in many fields, and demands for higher voltages and larger currents are rapidly expanding.

Conventional stabilized power supply devices of this type utilize various types of circuits depending on whether an AC power source or a DC power source is used. For example, a DC stabilized power supply using a thyristor is an example of the former, and a typical example of the latter is a DC stabilized power supply using a switching regulator. Each of these DC stabilizing single source devices is configured with a scale corresponding to the load voltage and current size.
It's being used.

[The gap that the invention attempts to solve]

There is an increasing demand for higher voltage and larger current for the above-mentioned conventional stabilized power supply devices.For example, in the field of broadcasting equipment, high-voltage power supplies that can use around 30V (volts) and 120A (amperes) are increasing. High-voltage, high-capacity sources have been developed and are used as power sources for each of the power amplifiers arranged in parallel. In addition to broadcasting equipment, we also maintain various electronic devices that require high voltage and large current.

Solid-state devices are being developed one after another from the viewpoint of inspection, miniaturization, and reliability improvement, and correspondingly, demands for high voltage and large VL current for the required power source are also increasing.

In order to meet these requirements, it is desirable that a stabilized power supply device be made as low in cost as possible, and as small and lightweight as possible. However, none of the conventional stabilized power supply devices of this type have achieved a good balance of low cost, small size, and light weight, and most of them have the drawbacks of being expensive, large, and bulky. Another object of the present invention is to provide a stabilized power supply device that eliminates the above-mentioned drawbacks.

[Means for solving problems]

The device of the present invention is a stabilized power supply device that receives an unregulated AC power source, converts it into a stabilized DC power source with a predetermined voltage and current, and outputs the same, in which voltage fluctuations of the unregulated AC power source are set in advance. A stabilized AC power supply that stabilizes the AC voltage to a specified value, and an unstable DC voltage that outputs an unregulated DC voltage within a preset high voltage range of the DC voltage to be supplied to the load in response to the AC output from this stabilized AC power supply. A stabilized DC voltage in a low voltage range that corresponds to at least the voltage fluctuation in the unregulated DC voltage among the DC voltages to be supplied to the load upon receiving the AC output from the stabilized AC power supply. and a low-voltage switching regulator that generates the stabilized DC voltage and controls the sum voltage of the stabilized DC voltage and the unregulated DC voltage to always maintain it at a predetermined set value.

〔Example〕

Next, the present invention will be described in detail with reference to the drawings.

The first section is a block diagram showing the configuration of an embodiment of the stabilized power supply device according to the present invention, which includes a stabilized AC power supply 1, an unregulated DC power supply 2, a low voltage switching regulator 3, a voltage dividing resistor 4, and a voltage dividing resistor 4. 5.

The AC stabilized power supply 1 receives commercial AC power through input terminals 101 and 102. This commercial 'RL@ is single phase 100
V, 50/60-F cycle, or 3-phase 200 V
, Commercial use such as 50/60 cycle? [The desired one may be arbitrarily selected from among them, taking into consideration the operational purpose; in the case of this embodiment, three-phase AC 200V.

It uses a 50 cycle power supply. AC stabilized power supply 1
In this way, the voltage fluctuation rate of the input AC power source is compressed and improved to about 1 to 2%.

In this case, three-phase AC 2 with a voltage fluctuation rate of ±15%
00V is compressed to a voltage fluctuation rate of approximately ±1% to produce 3-phase 200V.
, is output as 50 cycles.

This AC stabilized power supply 1 functions as a kind of AV ratio (automatic voltage regulator) using a thyristor or magnetic amplifier, and basically reduces the voltage fluctuation rate of AC input to 1.
Although the purpose is to suppress the voltage to about 2%, in addition to this basic function, it is also possible to easily provide a voltage transformation or DC conversion function corresponding to the magnitude of the stabilized DC output. Such transformation is effective when there is a large difference between the magnitude of the AC input and the desired stabilized DC input;
Furthermore, converting the voltage to direct current can be arbitrarily implemented in accordance with the configurations of the unregulated direct current power supply 2 and the low voltage switching regulator 3, which will be described later.

3-phase 200V output from AC stabilized power supply 1,
The ±1% AC is supplied to the unregulated DC power supply 2 and the low voltage switching regulator 3, where it is converted to a predetermined DC voltage.The unregulated DC power supply 2 then uses a normal smoothing circuit using coils, capacitors, etc. +25 via etc.
Outputs an unregulated DC voltage of V as a reference voltage.

On the other hand, the low voltage switching regulator 3 outputs a stabilized DC voltage of +3V as a reference voltage, and these two reference voltages are added in series to the output terminals 201 and 2.
It is applied and output between 02 and 02.

Therefore, between the output terminals 201 and 202, +
28V is generated.

It is clear that this reference voltage varies depending on the condition of the load connected via the output terminals 201, 202, and most of the variation is due to the unregulated DC power supply 2. 1 Now, this range of fluctuation is 10, -
If the voltage is 3V and a maximum fluctuation of -3V occurs, the DC output will naturally become +25V. In order to maintain this voltage at +28V, it is necessary to increase +3V by some means. In this case, the low voltage switching regulator operates as follows to change the reference voltage of +3V to +6V and output it, and maintain the DC output at +28V.

When the voltage between the output terminals 201 and 202 is +28V, the voltage e1 across the voltage dividing resistor 4 is 3V.
Therefore, the voltage e2 across the voltage dividing resistor 50 is set to a resistance value of +25V. el is constantly supplied to the low-voltage switching regulator 3, and while the voltage is compared with the built-in +3V reference power supply, it is controlled through either the energization period control of semiconductor control elements such as transistors and thyristors, or the operating frequency control. The output voltage is changed from the reference voltage +3V so that el is always 3V.
+e2 is always held at +28V.

Normally, this type of DC voltage stabilization involves receiving a three-phase input power of 200V and then outputting all of the desired stabilized DC output via a switching regulator. , as high voltages such as several tens of OA and large currents progress, it is inevitable that cost reductions will increase at an accelerating rate, as well as increases in weight and structure.However, in the present invention, voltage fluctuations of AC input are temporarily suppressed. Later, by using that output and having an unregulated DC power supply share most of the output voltage, the switching regulator is only intended to stabilize the remaining low voltage range that includes the fluctuations, thereby greatly solving the above problem. It is said that this has been improved.

In the embodiment shown in FIG. 1, the voltage combination of el and e2 can be arbitrarily set on the premise that fluctuations in the output voltage are stable.

〔Effect of the invention〕

As explained above, according to the present invention, the voltage fluctuation of the AC input power supply is once suppressed to about 1 to 2%, and then the sum of the outputs of the low voltage switching regulator which uses this as input and the unregulated power supply is set as pressure. By providing a means for securing a desired stabilized DC power source, it is possible to easily realize a high voltage, large current stabilized power supply device that can be significantly reduced in cost, smaller in size, and lighter in weight.

[Brief explanation of drawings]

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

Claims (1)

[Claims] In a stabilized power supply device that receives an unregulated AC source as input, converts it into a stabilized DC power source with a predetermined voltage and current, and outputs the same, the voltage fluctuation of the unregulated AC power source is stabilized to a preset value. an AC stabilized power supply; and an unregulated DC power supply that receives the AC output from the AC stabilized power supply and outputs a first unregulated DC voltage in a preset high voltage range among the DC voltages to be supplied to the load. and a second stabilized DC voltage in a low voltage range corresponding to at least the voltage fluctuation in the first unregulated DC voltage among the DC voltages to be supplied to the load in response to the AC output from the AC stabilized power supply. A low-voltage switching regulator that generates a voltage and controls the sum of the second regulated DC voltage and the first unregulated DC voltage to always maintain it at a predetermined set value. A stabilized power supply device characterized by: