JPS61258668A - Chopper type dc/dc converter - Google Patents

Abstract

PURPOSE:To stabilize an output in a high efficiency by connecting in series a controller for flowing the prescribed current in response to an output, the load winding of a saturable reactor, and a rectifying diode between a switch element and an output smoothing circuit. CONSTITUTION:A DC power source 1 is switched by an oscillator 17 via a switch element 2 of a chopper type DC/DC converter, rectified, smoothed by elements 22-25 to supply a load current I03 to a load 27. In this case, a saturable reactor 18 having a load winding 19, a control winding 20 and the tertiary winding 21, and a controller 28 are provided, and the reactor 18 is magnetized in the polarity with black circle by the controller 28 with a reset current in response to the detected value of the output V03. Thus, when the element 2 is turned ON, the reactor 18 stops an input voltage for the prescribed period, is then saturated to supply a voltage of pulse width to specify the output voltage V03. When the element 2 is turned OFF, storage energy is regenerated from the winding 21 to the power source 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides an Ilf
In particular, the present invention relates to a Chisonotsuba WDC-DC converter that uses a saturable reactor to stabilize the output.

(Prior art) In the chip shop DC-DC converter, as shown in FIG. 4, changes in the output voltage vol caused by fluctuations in the load current IO8 are detected and the control circuit 9 controls the opening and closing of the switching element 2. A method for stabilizing the output is known from K. Also, as a multi-output cable-flange type DC-DC converter that obtains multiple outputs from one switch element, the one shown in Fig. 5 is known.
In the figure, the output frost is stabilized by controlling the opening and closing of the switch element 2 by the control circuit 9, and the output Vo
The output is stabilized by the AT three-terminal regulator 13.

(Problem to be solved by the invention) However, in the circuit system shown in diagram s4, the load current I0
As 1 becomes smaller, the current flowing through the smooth check coil 4 becomes discontinuous, and during the ON period of the switch element 20, the voltage of both layers of the smooth check coil 4 decreases, and the output voltage tends to rise. Therefore, the on period of the switch element 2 is reduced by the control circuit 9, and in some cases, intermittent firing may occur.

For this reason, a multi-output chip-shaped ■-DC as shown in Fig. 5 is used.
When the converter is configured, the output vI)1 load current■. .

When the voltage r is small, the pulse width of the voltage input to the smoothing voltage 11 of the output v12 becomes small for the above-mentioned reason, so when the load RIot becomes large, the voltage V. A problem arises in which the value is less than the specified value. For this reason, smooth 1st - 4th square
Increasing the inductance and installing a dummy resistor between output terminals 6 and 7 will increase the load current ■. Measures have been taken to prevent the current flowing through the smooth check coil 4 from becoming discontinuous even when 1 is zero. However, such a measure would not only lead to an increase in the size of the smooth chain coil 4, but would also cause problems such as a decrease in efficiency. Also the output V. Since the three-legged regulator 15 is used to stabilize the output of , there is also the problem of large losses.

(Means for Solving the Problems) In order to solve the above problems, in the present invention, a groove is provided between the switching element and the output smoothing circuit by a control circuit that flows a predetermined current according to the output, and a saturable reactor. A method of stabilizing the output was adopted by connecting the load winding machine of the saturable reactor of the magnetic amplifier and the rectifier diode in series.

(5j! Embodiment) FIG. 1 is an embodiment of a Chirotsuba type DC-DC converter according to the present invention, and shows the basic circuit configuration. In the figure, since the switch element 2 is opened and closed by the oscillator 17, the load current is ■ during the opening and closing period of the switch element 2.

The configuration is such that it is not affected by . The control circuit 28 outputs v0. The positive terminal of the smoothing capacitor 25 outputs a reset current according to the detected value of the control circuit 28. Diode 29.
Control winding 20 of saturable reactor 18. In the load path of the output smoothing capacitor 25, the saturable reactor 18 is made to have a polarity jCa opposite to the black circle shown in the figure. When the switch element 2 is turned on, the saturable reactor 18 is magnetized to the polarity of the black circle, and the magnetic flux density changes, making it saturable. The reactor 18 is saturated after blocking the input voltage for a predetermined period of time, and as a result, a voltage with a pulse width that makes the output WEEVO3 a specified value is supplied to the cand side of the diode 25. When the switch element 2 is turned off, the energy accumulated in the saturable reactor 18 is transferred to the negative terminal of the input DC power supply 1, the diode 31. Load winding 19 of the saturable reactor 18
．． Volume 5 Inl1I21. Diode 50. The input DC power supply 1Vc is regenerated through the positive path of the input DC power supply 1, and subsequently the saturable reactor is reset again. Therefore, the control circuit 28 can easily reset the saturable reactor 1B.

Note that the control winding 18 is not provided, and the load winding 19 and the third winding machine 2 are
1, the operation is the same as in FIG. In this case, the current from the control circuit 28 passing through the diode 29 flows into the load winding 19 of the saturable reactor after passing through the connection point KfL between the load winding 19 and the diode 22. This is the first embodiment in which a multi-output chip type DC-DC converter is constructed by combining the control method of the present invention with a type DC-DC converter that stabilizes the output by This makes it possible to greatly increase efficiency compared to the configuration shown in Figure 5, which is combined with the conventional three-sided generator. It should be noted that since the switch element 2 is feedback-controlled from the output 7 through the control circuit 9, there is no need for a separate oscillator as in the embodiment shown in FIG.

Fig. 3 shows another embodiment in which the present invention is applied to a multi-output chip-shaped DC-DC converter. It is possible to construct a multi-output chip type converter that can independently obtain two outputs from no load to maximum output without increasing the output.

(Effects of the Invention) As described above, the present invention makes it possible to obtain a multi-output chip MDC-DC converter with high efficiency and excellent output stability.

[Brief explanation of the drawing]

FIG. 1 is a basic circuit configuration diagram showing one embodiment of the present invention, and FIG. 2 and wL5 are circuit configuration diagrams showing the application of the present invention to a multi-output chip-shaped DC-DC converter, respectively. be. Figure 4 is a circuit configuration diagram of a chip-shaped DC-DC converter that stabilizes the output using a conventional switch element, and Figure 5 shows the output and series dropper that stabilizes the output using a conventional switch element. A multi-output chisotsuno<mDc-
It is a circuit block diagram of a DC converter. 1: DC power supply, 2: switch element, 18 bisaturable reactor, 19: load winding of saturable reactor, 20: control winding of saturable reactor, 21: possible jI! I No. 2 No. 3 Figure 4 Procedural Amendment Document Showa % 1.4 - Indication of the case of the Director-General of the Japan Budget Agency 1985 Patent Application No. 97486 Title of the invention Person who corrects chopper type DC-DC converter Relationship to the case Patent applicant address: 2-1-2 Marunouchi, Chiyoda-ku, Tokyo Subject of amendment: “Drawings”. 1st Figure 2

Claims (1)

[Claims] 1) Connecting one or more output rectifier circuits to a switch element connected in series with a DC power source to take out one or more outputs D
A C-DC converter characterized by having the following parts. (a) A saturable reactor inserted and connected between the switch element and the output rectifier circuit. (b) A control circuit that detects an output voltage and causes a predetermined current to flow through the saturable reactor according to the output voltage, thereby stabilizing the output voltage. (c) A saturable reactor wound around the same iron core of the saturable reactor, with one end connected between the saturable reactor and the output rectifier circuit, and the other end connected to the positive electrode of the DC power supply via a diode. The third winding of the reactor. 2) One or more output rectifier circuits are connected to a switch element connected in series with a DC power source to extract one or more outputsD.
A C-DC converter characterized by having the following parts. (a) A load winding of a saturable reactor inserted and connected between the switch element and the output rectifier circuit. (b) A control circuit that detects an output voltage and flows a predetermined current through a control winding of the saturable reactor in accordance with the output voltage to stabilize the output voltage. (c) A control winding of the saturable reactor, which is wound around the same iron core of the saturable reactor and has one end connected to the control circuit through a diode, and the other end connected to the negative electrode of the DC power supply. (d) Wound around the same iron core of the saturable reactor, one end connected between the load winding of the saturable reactor and the output rectifier circuit, and the other end connected to the positive pole of the DC power supply via a diode. The third winding of the saturable reactor. 3) A DC-DC converter in which one or more rectifier circuits are connected to at least one switching element connected to a DC power supply, respectively, and two or more outputs are taken out from at least one of the switching elements. The chopper type DC-DC according to claim 1 or 2, characterized in that the chopper type DC-DC is configured to stabilize the output by a circuit having the saturable reactor and the control circuit.
converter. 4) Output of at least one of the two or more outputs is stabilized by the switch element, and at least one other output is stabilized by a circuit having the saturable reactor and the control circuit. A chopper type DC-DC converter according to claim 1 or 2, characterized in that the chopper type DC-DC converter is configured as follows.