JPH0970171A - Dc-dc converter circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the noise component of the secondary output voltage value of a switching transformer so as to prevent the production of errors by connecting a resistor between one secondary winding of the transformer and a rectifier between the connecting point of the rectifier and the resistor and the other secondary winding of the transformer. SOLUTION: A transistor 2 for control is provided on the primary winding side of a switching transformer 1 as a self-arc extinguishing element and a resistor is connected between one secondary winding of the transformer 1 and a rectifier 4 on the secondary side. In addition, a capacitor 7 is connected between the connecting point of the rectifier 4 and resistor 6 and the other secondary winding of the transformer 1. Therefore, a noise-bearing voltage induced in the secondary winding of the transformer can be stabilized with accuracy without producing any error by absorbing the noise component of the voltage before the rectifier 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is not affected by noise.
The present invention relates to a DC / DC converter circuit that stabilizes a secondary output voltage.

[0002]

2. Description of the Related Art FIG. 2 is a circuit diagram showing an example of a conventional DC / DC converter circuit. 1 is a switching transformer, 2 is a control transistor as a self-extinguishing element, 3 is a snubber circuit 4 is a rectifier, 5 is a smoothing capacitor. In the output section of the DC / DC converter, the rectifier 4 is connected to the secondary side of the switching transformer 1, and the smoothing capacitor 5 is provided on the anode side of the rectifier 4.

[0003]

However, in the conventional circuit, when noise occurs in the secondary winding of the switching transformer 1, the secondary output voltage is affected through the rectifier 4,
Noise increased from the original output voltage value, causing an error. The present invention has been made in view of the above-mentioned points, and an object thereof is to provide a DC / DC device that solves these drawbacks.
A DC converter is provided.

[0004]

In other words, a means for achieving the object is to provide a self-extinguishing element on the primary winding side of a switching transformer and to provide a rectifier and a capacitor as a rectifying circuit on the secondary side. DC / D provided to extract output voltage
In the C converter circuit, a resistor is connected between one of the secondary windings of the switching transformer and the rectifier, and a capacitor is connected between the rectifier and the resistor and the other secondary winding of the switching transformer. There is something I did.

[0005]

The function is that the high frequency noise component is absorbed by the filter circuit of the resistor 6 and the capacitor 5, and DC /
The secondary output voltage of the DC converter circuit does not include noise. An embodiment of the present invention will be described in detail below with reference to the drawings.

[0006]

1 is a circuit diagram showing an embodiment of the present invention, in which a resistor 6 and a capacitor 7 are provided before a rectifier circuit by a rectifier 4 and a capacitor 5 on the secondary side of a switching transformer 1 shown in FIG. The filter circuit is composed of With this configuration, the voltage including noise induced in the secondary winding of the switching transformer 1 is absorbed by the noise before the rectifier 4, and the output voltage rectified by the rectifier 4 and the capacitor 5 is the original output voltage. It becomes a value.

[0007]

As described above, according to the present invention, the secondary side output voltage of the DC / DC converter circuit can be made accurate and stable with a simple circuit configuration, which is extremely useful.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a conventional example.

[Explanation of symbols]

 1 Switching Transformer 2 Control Transistor 3 Snubber Circuit 4 Diode 5 Smoothing Capacitor 6 Resistor 7 Capacitor

Claims (1)

[Claims] 1. A DC / DC converter circuit for extracting an output voltage by providing a self-extinguishing element on a primary winding side of a switching transformer and a rectifier and a capacitor as a rectifying circuit on a secondary side of the switching transformer. Of 2
A DC / DC converter comprising a resistor connected between one of the secondary windings and the rectifier, and a capacitor connected between the rectifier and the resistor and the other secondary winding of the switching transformer. circuit.