JPS61109468A - Regulated power source - Google Patents

Abstract

PURPOSE:To obtain a notice signal with a simple circuit and to perform a stable operation by providing a DC/DC converter for an auxiliary power source which inputs an input DC voltage, and using the output as the power source of a controller and energization and power interruption notice signal. CONSTITUTION:In a power source for obtaining a DC output voltage V0 by connecting a switch circuit Q in series with the primary winding N1 of a transformer T to generate the intermittent primary side current, to rectify and smooth power induced in the secondary winding N2, a DC/DC converter 4 for an auxiliary power source with inputs a DC input voltage Vin is provided. The output E01 of the converter 4 is supplied as the power source of the control circuit 3 of the switch circuit Q. Further, part E01 of the output of the converter 4 is utilized as various notice signals of energization or interruption of the power source.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a stabilized power supply device that obtains a stabilized DC voltage. More specifically, the present invention provides a transformer having a primary winding and a secondary winding, a switch circuit that turns on and off an input DC voltage to the primary winding, and a transformer having a primary winding and a secondary winding. This stabilizer is equipped with a rectifying and smoothing circuit that rectifies and smoothes the AC voltage obtained through rectification and smoothing, and a control circuit that controls the on and off of the switch and check circuits so that the DC output voltage obtained by rectifying and smoothing is maintained at a constant value. This relates to a power supply device.

(Prior Art) FIG. 4 is a configuration and connection diagram showing an example of a conventional stabilized power supply device of this type. In the figure, BA is a rectifier circuit connected to an AC power supply, cl is a capacitor that smoothes the output of this rectifier circuit, and T is a primary winding n1 and a secondary winding n2.
A transformer with Q has a capacitor c1 on the primary winding #n1.
The switching transistors Di and D2 are 2
A diode that rectifies the AC voltage obtained in the next winding n2,
L is the smoothing thread, CO is the low tide capacitor, 21
．． 22 is an output terminal connected to both ends of the capacitor Co, from which an output DC voltage vO is obtained. 3 is a control circuit which inputs the output voltage vO and turns on and off the transistor Q so that the output cylinder pressure Vo becomes a constant value corresponding to the reference pressure.
OFF is controlled via an isolation transformer T1.

(Problems to be solved by the invention) In a stabilized power supply device having such a configuration, (a)
(b) How to obtain a power supply to operate the control circuit; (C)) How to start/stop/stop the switching of transistor Q. , etc. need to be solved.

The present invention attempts to solve these problems with a simple circuit configuration.

(Means for Solving the Problems) The present invention solves these problems by providing a transformer having a primary winding and a secondary winding, turning on an input DC voltage to the primary winding, Sui to give off.

a rectifying and smoothing circuit for rectifying and smoothing the alternating current voltage obtained at the secondary winding; In the device d equipped with a control circuit that controls on/off of a switch circuit, an auxiliary source DC source that receives the input DC voltage as an input.
/DC converter is provided, and the output of this DC/DC converter for auxiliary power supply is supplied as a power source to the control circuit, and this output is used at least as an Ail of the power supply and a notification signal indicating a power outage. It is something to do.

(Example) FIG. 1 is a diagram showing an example of the configuration of an apparatus according to the present invention. In this figure, parts corresponding to those in FIG. 4 are designated by the same reference numerals.

In the device according to the present invention, 4 is an auxiliary power supply NC/DC converter that receives the input DC voltage Vin, and its output E. 1, it is supplied as a power source to the control circuit 3, and output E. is applied to the signal generation circuit 5. .

The signal generation circuit 5 has a DC output voltage V. is also input, and the signal go from the DC/DC converter 4 is used to convert the signal 1. Notification signal S1 indicating power outage and transistor Q
This is to obtain a start/stop signal S2 for starting and stopping switching. A start/stop signal S2 is applied to the control circuit 3.

2 and 3 are connection diagrams showing an example of an auxiliary power supply DC/DC converter. In both examples, the book uses a ringing check converter, and when the transistor Q1 is activated with the starting resistor R8, the winding N
Positive feedback is applied in the order of 1 → winding N2 → base current IB → collector current IC → winding #N1, oscillation starts, and winding N3
Alternatively, an AC voltage is generated in the winding N4, and this is rectified and smoothed to obtain the DC voltage E. Eo is obtained by 1' 2 .

According to the device configured in this way, the auxiliary power supply DC/D
In addition to obtaining power for operating the control circuit 3 from the output side of the C converter 4, a voltage signal E corresponding to the input DC voltage Vin is also obtained from the output side of the C converter 4.
o can be easily obtained. This DC voltage signal Eo is electrically insulated from the primary side, has high noise resistance, and stably outputs a notification signal S1 indicating accurate energization and power outage. Also, this voltage signal EO2
It is also possible to create a start/stop signal S2 for switching the transistor Q and a control signal for controlling the on/off period of the transistor Q in accordance with the input DC voltage Vin.

(Effects of the Invention) As explained above, the present invention provides a
The output signal of the converter is used to obtain various voltage signals including a notification signal of a power outage, and this voltage signal is
It has the feature that it is insulated from the next side and is not affected by the state of the load applied by main DC output lightning or voltage Vo if. Therefore, according to the present invention, it is possible to realize a stabilized power supply device that has a simple configuration, has high noise resistance, and operates stably with low power consumption.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an example of the device according to the present invention, Figs. 2 and 3 are connection diagrams of the auxiliary power DC/DC converter in the device shown in Fig. 1, and Fig. 4 is a conventional device. FIG. T...Transformer, Q...Switching transistor, Dl, D2...Rectifier diode, Lo...Tadairi, Co...Low tide capacitor, 3...Control circuit, 4...・・DC/DC converter for auxiliary power supply, 5・
...Signal generation circuit. 3771

Claims (1)

[Claims] A transformer having a primary winding and a secondary winding, a switch circuit that turns on and off an input DC voltage to the primary winding, and a switch circuit that applies an input DC voltage to the secondary winding. A device comprising a rectifying and smoothing circuit that rectifies and smoothes an AC voltage obtained by rectifying and smoothing, and a control circuit that controls turning on and off of the switch circuit so that the DC output voltage obtained by rectifying and smoothing is maintained at a constant value, An auxiliary power supply DC/DC converter that receives the input DC voltage as an input is provided, and the output of the auxiliary power supply DC/DC converter is supplied as a power source for the control circuit,
A stabilized power supply device characterized in that this output is used at least as a notification signal indicating energization of the power supply and a power outage.