JPS58207118A - Power supply device - Google Patents

Abstract

PURPOSE:To obtain plural power supply devices for electronic circuit which eliminate a detecting circuit and can obtain a sufficient margin even at the rise time of a power supply, by using plural regulators having different threshold levels. CONSTITUTION:The output of a power supply SO is rectified and smoothed to be applied in common to regulators REG1 and REG2. When the DC voltage Vi is applied to the REG1, the REG1 delivers the stabilized voltage V01 during a period of Vi>VS1 (VS1: threshold voltage of REG1). While, the REG2 delivers the stabilized voltage V02 during a period of Vi>VS2 (VS2: threshold voltage of REG2). Therefore the power supply of a slave electronic circuit L02 is applied after the power supply voltage of a main electronic circuit L01 has a rise and is stabilized and when a power supply is applied for a system containing the circuits L01 and L02. Then the power supply of the circuit L01 has a rise after the power supply of the circuit L02 has a fall when the power supply is cut off.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply device suitable for supplying a dielectric voltage to a plurality of electronic circuits.

In a system consisting of multiple electronic circuits, if there is a leading circuit (for example, a digital circuit) and a subordinate circuit (611 analog circuit), the subordinate circuit may be released from the leading circuit, causing an accidental situation. In order to prevent this, turn on the power supply of the slave side circuit when the power of the leading side circuit starts up and becomes stable, and when the power goes off, turn off the power of the slave side circuit first. After that, it is necessary to turn off the power line of the main remote circuit. In a system consisting of an electronic circuit with a number of watts,
The power source for each circuit is usually taken from a common power supply via a regulator. As mentioned above, the source voltage is supplied from the main power supply to the main circuit and the electronic circuits subordinate to it via the regulator, and the power source for each electronic circuit is turned on/off at the same time as described above. K, which regulates the order of voltage rise/fall, requires a control means by the person in charge. A conventional power supply device in a system consisting of a plurality of electronic circuits having such a control means is shown in the first example.

In Figure 1, the SO output AC currents σ, J, and BE are rectifier and smoothing circuits, REG circuits, regulators that use the output of the R2O3 ket source SO as a common input, and Lo circuits and Lo□ are electronic circuits. Circuit LO□ is shown as a leading electronic circuit, and Lo2 is shown as a subordinate electronic circuit. DT is a detection circuit that detects the output voltage of the regulator REG□ on the leading side, and its detection signal aB is provided to the slave regulator REG2 and drives the switch SW.

In such a conventional power source device, the rising output of the main side regulator REG1 is detected by the supply circuit DT, and the detection signal S turns on the switch SW to control the output voltage of the regulator REG2. Supply circuit Lo2 K. Similarly, the fall of the power supply is detected by the detection circuit DT, and the detection signal S is used to turn on the switch SW to control the timing of the fall of the output of the dependent regulator REG2. The electrical system shown in the figure has been conventionally used as an electrical insertion circuit in a system having multiple electronic circuits, but: 0) An independent detection circuit DT is required, including mono-multiple circuits.

(b) It is difficult to maintain a margin when the power supply drops.

4. A special arrangement of optical isolator whistles, W, is required for pigeon lofts where the power supply commons on the regulators REG1 and REG2 sides are separated.

Had a problem with chopsticks. The great invention was to eliminate these shortcomings, and a block diagram of its embodiment is shown in Figure 2.

In Figure 2, SO is AC %1:1ilt, SE is rectifier Q, REGl is the company's regulator on the leading side, and R is
EG2 is the regulator of the slave side circuit, LO□ is the electronic circuit on the main side, and Lo□ is the slave w side electric circuit -7-[61F'.

The output of the power supply SO is rectified and smoothed by a rectification/lIf smoothing circuit rvSE, and its smoothed output, the W current voltage V□, is commonly applied to the regulators REG□ and REG2. This DC voltage V□ has a constant rise constant and a constant fall time constant, and an example of its waveform is shown in FIG. 3(a). In addition, No. 51421 (in 44, Vs□ke led @n
The threshold voltage of regierator REG1 is set to VS2
indicates the threshold voltage of the dependent side regulator REG2, and in the embodiment, Vs<□ and VS2<Vl are selected.

Therefore, if the DC voltage v1 is not applied to the regulator REG1, during the period of Vs□, the regulator RE
G1 outputs a stabilized voltage vO□ shown in FIG. 3 (b) whose peak value is regulated by Vsl, and this stabilized voltage V01 is applied to the leading electronic circuit LO as an output voltage. Furthermore, when the DC voltage v1 is applied to the regulator REG2', during the period of vl>Vs2, the regulator REG2 becomes the stabilized voltage vO3 (Vs<Vo) shown in FIG. <VS2), and this stabilized voltage vO□ is applied to the slave circuit LO□. In this way, due to the large difference between the null threshold T pressures VB1 and VS2, the output voltage VO of the regulator REG2 is
As is clear from FIGS. 3(b) and 3(c), time 2 definitely has a delay time TDon and a lead time TDoff. Therefore, a plurality of electronic circuits Lo1. In a system having Lo2, when the power is turned on, the power to the slave electronic circuits I and 02 is applied after the power supply voltage of the leading electronic circuit Lo1 has started up and stabilized. When the power is cut off, the power to the slave electronic circuit LO3 is turned off, and then the power to the leading electronic circuit LO is turned off. Therefore, it is reliably prevented that the slave side circuit LO□ is disconnected from the master side electronic circuit L01 and an unexpected operation occurs.

Although the specific circuit configuration of the regulator REG1f or REG2 is not fixed in particular, an example of the real carp of the regulator REG2 is shown in FIG. 4th ril
, □ indicates the output direct voltage of the rectifying and smoothing circuit RE shown in FIG. D□ and D2 are Zener diodes, R to R5 are loss generating elements, TR1 to TR3 are transistors, and C1 is a capacitor. The Zener voltage of the Zener diode D1 determines the threshold voltage VS2 of the regulator REG2. When the P voltage smoothed voltage v1 exceeds the Zener voltage of the Zener diode D1, this Zener diode turns on, and the resistance element R2
A pace current flows to the transistor TR through
1 turns on and TR2 turns off. As a result, resistor R4 and R51 zener diode D2 ° capacitor C1
The circuit consisting of transistor TR3 and transistor TR3 becomes a well-known series regulator, and an output voltage Vc2t''Vo□ is obtained by control voltage VC2.This output voltage vO□ has the (c)iv waveform in FIG. Applied to the electronic circuit L02 as a power supply voltage.vl<Vs
2, the Zener diode D1 is turned off, and as a result, the transistor TRIA+ is turned off and TR2 is turned on, so that the control voltage Vc2+=O, that is, vO□-0. In the circuit shown in Fig. 4, the capacitor C has a constant time constant with resistance elements R4 and R5, and a small voltage V
This is intended to alleviate the sudden tie and rush current to the circuit when O2 rises, and at the same time suppress noise generation by the Zener diode D2. In addition, the 4th rj
In the circuit of Il, resistor R5 and transistor TR
This is to prevent the capacitor C□ from being destroyed by the electric charge when the capacitor C□ is turned on, but it is not necessarily necessary.

As described above, this regulator REG2 does not necessarily have the same configuration as that shown in FIG. 4, and the configuration of the regulator REG□ is also not specified, and may be the circuit shown in FIG. 4. Flea 5 Regulator REG1
has a threshold voltage Vs1, and the regulator RE
There is a relationship of Vsl<VB2 between Vs□ and VB2 of G2, V82, and VB2, and these also have a relationship of VSl<VB2 with respect to the rectified and smoothed voltage v1.
Any regulator that has a relationship of VB2<Vl may be used.

In the main source Rtj configured in this way, (a)'
The power supply voltage stabilized by each V/half W# blur regulator is applied, but it is only necessary to determine the threshold level of this regulator, and a special detection circuit DT is not required as in the device shown in Fig. 1. As a result, #width is simplified.

1)' Since the time difference is detected using the time constant at the time of rise/fall that the DC voltage Vi essentially has, the sequence i- is guaranteed to be accurate. Furthermore, when the power supply is turned off, there is a sufficient margin compared to the conventional method.

(c)' Since the regulator itself detects the rise and fall of the power supply, it does not matter whether the power supply common is common or separate.

It has the following features.

[Brief explanation of the drawing]

FIG. 1 shows the block ρ1 of the conventional 1f source @ position, and the second block shows an example of the device of the present invention.
111111: . The figure is a waveform diagram for explaining the operation of the device of the great invention, and FIG. 4 is a specific circuit diagram of the regulator REG2 used in the device of FIG. 2. ST! ,... rectifier smoothing circuit, REGl, RBG2...
·regulator. 11th sleep 2nd sleep

Claims (1)

[Claims] A power supply device that is configured to input a DC voltage having constant rise and fall time constants, and is provided with a plurality of regulators each having a different threshold level, and is configured to supply the DC voltage as the DC source voltage.