JPH0274152A - Power source output stabilizer - Google Patents

Abstract

PURPOSE:To obtain a power source stabilizer having excellent output stability by selecting a desired operational format based on an input voltage. CONSTITUTION:A digital controller 16 compares the output voltage from a smoothing circuit 13 with a reference value and produces a pulse signal having duty ratio corresponding to the difference as the switch signal for a transistor 12. The duty ratio is calculated according to a stored and preset operating format and varies such that the ON time of the transistor 12 will be shorter for larger output voltage. Furthermore, the digital controller 16 stores a plurality of operating formats and one of which is selected corresponding to the digital value of input voltage to be fed to the input terminal 11. Switching operation of the transistor 12 is also influenced by the input voltage at the input terminal 11, and when the operating format is selected based on the detected voltage the power source output can be stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention (Industrial Field of Application) This invention relates to a power supply output stabilizing device, and more particularly to a power supply output stabilizing device that stabilizes output through digital control.

(Prior art) In general, digitally controlled power supply output stabilization devices are
a switch circuit in which the power supply output is supplied as an input voltage;
The device includes a smoothing circuit that smoothes and outputs the output of the switch circuit, and is configured to control the value of the output voltage by the switching operation of the switch circuit. Control of the switch circuit is performed by a digital controller. This digital controller generates a control pulse signal with a predetermined duty ratio based on the output voltage value, and supplies this to the switch circuit at 1%. In this case, the duty ratio of the control pulse signal is calculated according to an arithmetic format programmed into the controller in advance.

However, in conventional devices, the calculation format for calculating the duty ratio was fixed and only one, so it was not possible to adequately respond to various fluctuations in the power output. It was difficult to stabilize the output.

(Problems to be Solved by the Invention) This invention was made in view of the above-mentioned circumstances, and it improves the point that conventional power supply output could not be sufficiently stabilized, and makes it possible to change the calculation format as appropriate. The present invention aims to provide a power supply output stabilizing device with excellent output stability.

[Configuration of the invention (means and operation for solving the problem) This invention is
A switch circuit that switches 1U of human pressure, a smoothing circuit that smoothes the output of this switch circuit to obtain an output voltage, and compares the output of this smoothing circuit with a reference value, and calculates a predetermined calculation format from the difference component. In the power output stabilizing device, the switch control means includes a storage means for storing a plurality of calculation formats, and a detection means for detecting the input voltage. The method is characterized in that it is configured to select and use a desired calculation format from among the plurality of calculation formats based on the value detected by the detection means.

Since the switching operation of a switch circuit is affected not only by the switch control signal but also by the value of the input voltage, the output can be stabilized by selecting and using the desired calculation format based on the input voltage value. can improve sex.

Further, in order to select a desired calculation format, the switch control means includes a first storage means that stores a plurality of calculation formats;
a second storage means for storing the output voltage, and selects a desired calculation format from among the plurality of calculation formats based on the voltage value stored in the second storage means and the output voltage of the smoothing circuit. The first storage means stores a plurality of calculation formats, and the second storage means stores the switch control signal. It is also possible to adopt a configuration in which the calculation format c3i is selected from among the plurality of calculation formats based on the control signal stored in the calculation format.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a power supply output stabilizing device according to a first embodiment of the present invention. The output of a power supply circuit (not shown) is supplied as an input voltage to the input voltage 11, and this input voltage is supplied to the smoothing circuit 13 via a switching transistor I2. This smoothing circuit 13 smoothes the pulsed signal voltage given by the switching operation of the transistor 12, thereby generating an output voltage, and includes a diode 131, a coil 132,
and a capacitor 133.

The output voltage generated from the Wm conversion circuit 13 is supplied as an output voltage 14 as a power supply output, and is also supplied to the A/D converter 15. The A/D converter 5 is also supplied with an input voltage 11 .

A,,'D converter 15 A/D converts these input voltages and output voltages by time division processing, respectively.
Digital values corresponding to the input voltage and output voltage are supplied to the digital controller 1G.

The digital controller 16 compares the digital value corresponding to the output voltage outputted from the V smoothing circuit 13 with a predetermined reference value, and converts the pulse signal of the duty ratio corresponding to the difference component into the switch control signal of the transistor 12. occurs as. In this case, the duty ratio is calculated according to an arithmetic format stored in advance in the digital controller 16. The higher the output voltage is than the reference value, the shorter the transistor on time becomes. The smaller the value, the longer the on time of the transistor 12 becomes.

Furthermore, a plurality of calculation formats are stored and set in the digital controller 16, and which calculation format to use is determined according to the digital value of the input voltage supplied to the input voltage 11. Since the switching operation is affected not only by the switch control signal but also by the input voltage 11, the power supply can be controlled by detecting the input voltage in this way and selecting the desired calculation format based on the detected voltage. It becomes possible to stabilize the output.

FIG. 2 shows a power supply output stabilizing device according to a second embodiment of the present invention.Instead of using the input voltage, this device uses the output voltage output from the smoothing circuit one sampling ago and the current output voltage. The configuration is such that a desired calculation format is selected based on the relationship with the output voltage.

That is, the digital controller 1 in this device
7 includes a memory 18 that stores a digital value corresponding to the output voltage output from the smoothing circuit 13, and the voltage stored in this memory 18, that is, the voltage value one sampling ago, and the A/D converter 15 The output from , that is, the current output cuff pressure is supplied to the calculation unit 19 . This calculation unit 19 is configured to compare the digital value directly co-supplied from the A/D converter 15 with a base Qla stored in advance, and generate a switch control signal from the difference component according to a predetermined calculation format. However, the calculation format used is changed depending on the relationship between the output voltage one sampling before and the current output voltage as described above. For example, if the current output voltage is M
If it is higher than llifL and the output voltage one sampling before is also higher than the reference value, or if both are lower than the reference value, it can be determined that the calculation format currently being used is not appropriate, so try using another calculation format. use. By doing so, it becomes possible to select a more suitable calculation format.

FIG. 3 shows a power output stabilizing device according to a third embodiment of the present invention, in which a desired calculation format is selected based on the switch control signal generated immediately before. That is, the digital controller 20 in this device includes a memory 22 that stores the switch control signal to the transistor I2, and the signal series stored in the memory 22 and the output from the A/D converter 15 are input to the arithmetic unit. 2I. This calculation unit 21 is configured to compare the digital value supplied from the A/D converter 15 with a reference value stored in advance, and generate a switch control signal from the difference component according to a predetermined calculation format. The calculation format to be used is determined by the previous switch control signal stored in the memory 22.

When current flows continuously through the coil 132 of the smoothing circuit 13, the response of the system is slower than when the current flows intermittently, so if a digital controller is designed to support continuous mode, it will become unstable in intermittent mode. Conversely, if a digital controller is designed in continuous mode, the response in discontinuous mode will deteriorate. However, in this example,
Since it is possible to detect whether the current mode of the coil 132 of the smoothing circuit 13 is continuous or intermittent based on the output series of the switch control signal, that is, the duty ratio of the signal, it is possible to select the calculation format corresponding to the current mode. can. Therefore, the power output can be stabilized regardless of the current mode of the coil.

[Effects of the Invention] As described above, according to the present invention, the calculation format can be changed, and the power output can be sufficiently stabilized.

[Brief explanation of the drawing]

1 is a block diagram showing a first embodiment of the power output stabilizing device of the present invention, FIG. 2 is a block diagram showing a second embodiment of the power output stabilizing device of the present invention, and FIG. 3 is a block diagram showing a second embodiment of the power output stabilizing device of the present invention. FIG. 3 is a block diagram showing a third embodiment of the power output stabilizing device of the present invention. 12... Switching transistor, 13... Smoothing circuit, 15... A/D converter, IG, 17.
20...Digital controller, +g, 22...
-Memory, 19, 21...Arithmetic unit. Applicant's agent Patent attorney Takehiko Suzue

Claims (3)

[Claims] (1) Compare a switch circuit that switches the input voltage, a smoothing circuit that smoothes the output of this switch circuit to obtain an output voltage, and the output of this smoothing circuit and a reference value,
A power output stabilizing device comprising: a switch control means for generating a switch control signal for the switch circuit according to a predetermined calculation format from the difference component; and a detection means for detecting the input voltage, and is configured to select and use a desired calculation format from the plurality of calculation formats based on the value detected by the detection means. Features: Power output stabilization device. (2) Compare a switch circuit that switches the input voltage, a smoothing circuit that smoothes the output of this switch circuit to obtain an output voltage, and the output of this smoothing circuit and a reference value,
and switch control means for generating a switch control signal for the switch circuit according to a predetermined calculation format from the difference component, wherein the switch control means includes a first memory that stores a plurality of calculation formats. and a second storage means for storing the output voltage, and calculates the plurality of calculation formats based on the voltage value stored in the second storage means and the output voltage of the smoothing circuit. A power output stabilizing device characterized in that it is configured to select and use a desired calculation format from among them. (3) Compare a switch circuit that switches the input voltage, a smoothing circuit that smoothes the output of this switch circuit to obtain an output voltage, and the output of this smoothing circuit and a reference value,
and switch control means for generating a switch control signal for the switch circuit according to a predetermined calculation format from the difference component, wherein the switch control means includes a first memory that stores a plurality of calculation formats. means for storing the switch control signal;
storage means, and is configured to select and use a desired calculation format from the plurality of calculation formats based on the control signal stored in the second storage means. Features: Power output stabilization device.