JPH03245729A - Power supply system for information processor - Google Patents

Abstract

PURPOSE:To avoid transient unstable operation of a DC/DC converter at the time of power interruption on power recovery by sequentially controlling the establishment of an auxiliary power source, the establishment of conversion input of the converter and the start of a controller in this order at a predetermined interval at the time of starting, and controlling in a reverse sequence to that at the time of starting, at the time of ending. CONSTITUTION:Only an output 2 is output in an initial state, and power is supplied only to a power source controller 5. When a power source controller 55 receives a start signal in this state, the controller 55 establishes the output 1 of an external power source 53. Thereafter, the controller 5 closes the contacts K1, K2 of a general rectifier section 51, establishes a DC voltage between A and B, sets a DC/DC converter start signal to a high level, rises the output of a DC/DC converter 57, and starts power supplying to the power source controller 73 of an information processor 54. The control is performed in a reverse sequence to that at the time of starting, at the time of ending.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a power supply system for an information processing device, and in particular, it is composed of a plurality of secondary control DC-DC converters, and has a mixed voltage output of positive polarity and negative polarity. Regarding the power supply system.

[Conventional technology]

Generally, in a secondary control DC-DC converter, power for driving a control circuit and a drive circuit is supplied by an auxiliary power source.

If a single voltage is required on the load side, it is possible to increase the load capacity by connecting multiple converters with the same output voltage in parallel. It is possible to collectively supply power for driving the control circuit and drive circuit of the converter. This type of technology includes, for example, the development of high-frequency SW power supplies (Torikepps Co., Ltd., published in December 1986)2.
This is shown in Figure 9 on page 12.

However, if the load is one that operates various logic elements, such as in an information processing device, a variety of power supply voltages with both positive and negative polarities are required. In such a case, if an auxiliary power source for driving multiple DC-DC converters supplying various output voltages is provided outside the converter and the auxiliary power source is to be supplied to each converter all at once, the connection as shown in FIG. 8, for example, will be required. I will do it. FIG. 8 shows, as an example, a power supply system that supplies +3V and -5V power.

In FIG. 8, 101 is a DC-D (,
Converter 102 is a DC-DC converter with an output voltage of 5 cm, and in order to supply +3 V and 5 cm, respectively, output B of converter 101 and output a of converter 102 are connected, and this is set to the standard of O It is set as electric potential. Then, auxiliary power source 105 collectively supplies auxiliary power source to each converter. Note that the converter 101
．． 102 is a control circuit that is a transformer 103.104.106
．． It is isolated from the primary circuit by 107 and serves as a secondary control, and is connected to the main switch 108 of the primary circuit.
By turning on and off 109, 110, and 111, power is transmitted to the secondary side of transformer 106, 107. In this state, since there is a negative polarity converter (converter 1o2), a current path is established from the o line of converter 101 to the 15 line of converter 102 via the O line of the auxiliary power supply, as shown by the broken line. , resulting in the output of converter 102 being shorted. Therefore, in order to avoid such failures in the power supply system, in power supply systems for information processing equipment, etc. that require various output voltages of positive and negative polarity, the auxiliary power supply for driving the DC-DC converter must be externally connected. It was not possible to provide them all at once, and each DC-DC converter had to have one.

[Problem to be solved by the invention]

The above-mentioned conventional technology uses DC
- Since no consideration was given to simplifying the auxiliary power source of the DC converter, there was a problem in that it hindered miniaturization of the power supply system.

An object of the present invention is to reduce and simplify the number of components in a power supply system and facilitate downsizing by collectively supplying auxiliary power to a DC-DC converter in a power supply system such as an information processing device as an external power supply. It is in.

Another object of the present invention is to avoid transient unstable states at startup and shutdown and to achieve stable operation in a power supply system that drives a DC-DC converter with an auxiliary power source configured from an external power source. There is a particular thing.

Furthermore, another object of the present invention is to avoid transient unstable operation of the DC-DC converter during power outage and power restoration in such a power supply system, and to enable stable operation of the DC-DC converter.

[Means to solve the problem]

In order to achieve the above purpose, the power supply system of the present invention has D
An auxiliary power supply for driving the control circuit of the C-DC converter is provided as an external power supply, and the positive output terminal of the external power supply is connected to the positive power supply line of the control circuit of each DC-DC converter. The output end of the converter is connected to an output power supply line that serves as a reference potential for the DC-DC converter group.

In addition, in order to achieve the above-mentioned other objects, the power supply system of the present invention is provided with a switch at the output of the external power supply, so that it is possible to control the supply of auxiliary power to the control circuit. -Establishment of conversion input of DC converter,
Control is performed at regular intervals in the order in which the control circuit starts, and when the control circuit is turned down, the control is performed in the reverse sequence to that when it is started.

Furthermore, in order to achieve the other objects mentioned above, the power supply system of the present invention is provided with a power failure detection circuit on the primary power input side of the DC knee DC converter, and when a power failure is detected, the power supply system of the present invention
The operation of the converter is stopped, and after the power is restored, the transient state of the control circuit is avoided and the operation of the DC-DC converter is restarted.

[Effect]

According to the present invention, in a power supply system in which positive polarity and negative polarity DC-DCC type converters are mixed, auxiliary power is supplied from one external power supply to the control circuits of multiple DC-DC converters without generating short-circuit current. Therefore, the number of parts of the power supply system can be reduced and the power supply system can be made smaller.

In addition, the power supply system can be started up and
By controlling the startup and shutdown, the DC
- Unstable operation of the DC converter can be avoided.

Furthermore, by controlling the DC-DC converter in a specific sequence when a power outage is detected, an unstable state will not occur at the time of a momentary power outage or power restoration.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the connection of the DC-DC converter in the power supply system of the present invention.

In FIG. 1, 1. 2. 3 is a secondary control DC-DC converter, 4,5°6 is a control circuit for each DC-DC converter, 7 is a negative polarity load,
8 and 9 are positive polarity loads, 19 is an external power supply that collectively supplies auxiliary power to the control circuits 4 and 5.6, and 20 is a DC-DC
A DC input power source input to the converter, which is a DC-D
Connect to DC converters 1, 2, and 3 all at once, and connect each DC
- Perform power conversion with a DC converter and load 7. 8.
9. Furthermore, while the DC-DC converter is in operation, its output can be seen isometrically as a voltage source, so these are shown as voltage sources 11, 12 and 13.

On the output side of each DC-DC converter, if a reference potential of 0 is selected for the power supply line]5 as shown in Figure 1, then
The DC-DC converter 7 operates as a negative polarity converter and can supply power to the negative polarity load 7 via the power supply line 16.

Further, the DC-DC converters 8 and 9 operate as positive polarity converters and can supply power to the positive polarity loads 8 and 9 via the power supply lines 17 and 18, respectively.

Control circuit for each DC-DC converter 4. 5. The low-potential side power supply lines of 6 are connected to the low-potential side output lines of the respective converters, and the other power supply lines of each control circuit are collectively connected to the positive side of the external power supply 19. Further, the negative electrode side of the external power supply 19 is connected to the power supply line 15 which is a reference potential line of the power supply system.

With such a connection, the negative electrode side of the external power supply 19 is connected to the control circuits 5 and 6 via the power supply line 15, and auxiliary power is supplied to the control circuit 4.
5 and the negative electrode side of an external power source 19 are connected through the voltage source 11, and an auxiliary power source is supplied. The current of the auxiliary power supply supplied from the external power supply 19 to the control circuits 4, 5.6 is connected to an independent closed loop 21, 22.2, respectively.
3. Therefore, a current path that short-circuits the output through another DC-DC converter, as shown by the broken line in FIG. 8, does not occur.

Here, the negative polarity DC-DC converter 1 is a voltage source 1
The operation described above is for the case where the voltage source 11 is established. Next, if the voltage source 11 is not established, i.e. DC; -DC: negative polarity DC-D when the converter is not operating;
The supply of auxiliary power to the control circuit of the CC-type controller will be explained.

Figure 2 shows the negative polarity DC-D in the power supply system according to the present invention.
This figure shows the circuit configuration of the CC-type controller.

The DC-DC converter 31 performs high frequency switching on the DC voltage input from the DC input power supply 20 using the switch 33, and rectifies and smoothes the voltage appearing on the secondary side of the transformer 340 using the rectifier and smoothing circuit 41 to obtain a DC output voltage. The rectifying and smoothing circuit 41 is a general rectifying and smoothing circuit composed of rectifying diodes 35 and 36, a choke coil 37, and a smoothing capacitor 38.

As described above, in the C-DC converter 31, when the control circuit 40 is not generating a pulse to drive the switch 33, no voltage appears on the secondary side of the transformer 34.
No voltage is generated at the output of the DC-DC converter 1.

However, the rectifier circuit of the DC-DC converter 31 can be seen as a parallel connection circuit of a capacitor 38 and diodes 35 and 36 for direct current, as shown in FIG. 39, it is possible to flow a standby current as shown by a broken line 42. Therefore, DC-
Even if the output of the DC converter is not established, it is possible to supply auxiliary power to the control circuit 40 from the external power supply 39 and to operate the DC knee DC converter 31.

FIG. 4 shows an example in which the DC-DC converter according to the present invention is applied as a power supply system for an information processing device. Since information processing equipment uses a variety of logic elements, its power supply system requires a variety of output voltages.
Although a large number of DC-DC converters are required, in this embodiment, in order to simplify the explanation, one DC-DC converter will be considered.

The commercial power source 5o is connected to an external power source 53 via a negative rectifier 51 and a circuit breaker 52.

The external power supply 53 is a multi-output power supply, and output 1 is DC-DC.
It is supplied as an auxiliary power source to the control circuit 58 of the converter, and the output 2 is connected to the power control section 55 in the logic circuit 54 of the information processing device.

In addition, the output of the - bracket rectifier 51 is the DC-DC converter 5
7, performs power conversion and performs calculations and calculations on the information processing device.
Power is supplied to the control unit 73.

In a power supply system with such a configuration, startup,
The lowering operation will be described with reference to FIG.

First, when starting up, turn on the circuit breaker 52,
External power supply 53 that supplies commercial power supply 50 to external power supply 53
converts this commercial power supply 50 into a rectifier circuit 59 and a capacitor 6
0 for rectification and smoothing, switch 61 for switching, and the secondary side of transformer 62 to obtain converted power. Furthermore, the output 1 side has diodes 65, 66, choke coil 68, and capacitor 70, and the output 2 side has diodes 63, 64,
The choke coil 67 and the capacitor 69 smooth and rectify the power appearing on the secondary side of the transformer 62, respectively, to obtain new DC power.

In the initial state, the electronic switch 56 of the output 1 of the external power supply 53 is in the off state, and only the output 2 is output.
Power is supplied only to the power control unit 55 of the information processing device ft 54. When the power supply control unit 55 receives a start-up signal in this state, the power supply control unit 55 turns on the photocoupler 72 of the electronic switch 56, turns on the electronic switch 56, and establishes output 1 of the external power supply 53 (the first Figure 5 Time 1.).

After the output 1 of the external power supply 53 is established, the power supply control section 55 turns on the contactors Kl and 2 of the collective rectification section 51 to output A-.
Establish a DC voltage between B (time 1 in Figure 5), DC
- Set the DC converter start signal to high level to convert DC-DC.
The output of the converter 57 is raised, and power supply to the arithmetic control section 73 of the information processing device 54 is started (time 1s in FIG. 5).

The time from time t□ until output 1 is established can be determined from the response speed of the electronic switch 72, and the time from time t2 until the voltage between A and B is established is determined by the charging time constant of the capacitor 74. It can be grasped by the time determined by 1. -1. time in between. and 1. -1. You can determine the time between. Therefore, by providing a counting circuit in the power supply control section 55 and counting for a predetermined period of time, the above-mentioned start-up control can be performed.

Further, at the time of startup, the sequence opposite to the startup control described above is taken.

First, the DC-DC converter activation signal is set to low level to lower the output voltage of the DC-DC converter 57 (time t4 in FIG. 5). After this, after a certain period of time has elapsed, the contactor Kl of the bulk rectifier 51 is turned off at the time shown in FIG.
), and after a certain period of time has elapsed, the electronic switch 56 is turned off to stop power supply to the control circuit 58 of the DC-DC converter 57.

In power supply systems for information processing equipment, etc., secondary
When applying a control DC-DC converter system, if an auxiliary power source for driving is supplied as an external power source, the main circuit and control circuit of the DC-DC converter try to operate independently, so when starting up and stopping the Although there is a risk of unstable operation, the transient unstable state of the DC-DC converter can be avoided by controlling the startup and shutdown as described above.

FIG. 6 shows another example in which the DC-DC converter according to the present invention is applied as a power supply system for an information processing device.

Figure 6 shows that in addition to sequence control at startup and shutdown,
This makes it possible to avoid unstable operation of the DC-DC converter due to instantaneous power failures and double power failures, and a power failure detection circuit 80 is added to the power supply system shown in FIG. 4. Components in this figure that are common to those in FIG. 4 are given the same numbers.

When the commercial power supply 74 has a momentary power outage, if the momentary power outage time is sufficiently short and the capacitance of the capacitor 74 is sufficiently large, the capacitor 7
4 is small, and the output voltage can be ensured by the control circuit 58 controlling the pulse width so as to correct the drop in the input voltage of the DC-DC converter.

However, if the voltage drop across A-8 is severe and exceeds the control range of the control circuit 58, it becomes difficult to secure the output voltage, and the current flowing to the primary side of the main circuit of the DC-DC converter also becomes excessive. If the commercial power supply 50 is suddenly restored in this state, the main circuit of the DC-DC converter will be damaged. Therefore, in the power supply system shown in FIG.
A power failure detection circuit 80 provided in 1 monitors the voltage drop between A-8, and a power supply control unit 55 controls the sequence in the event of a momentary power failure.

When the voltage across A-8 of the bulk rectifier 51 decreases, the shunt regulator 83 is simultaneously divided by the resistors 81 and 82.
The reference voltage of is also reduced. As a result, the anode and cathode of the shunt regulator 83 are turned off, the light emitting diode 84 of the photocoupler is turned off, and a power failure detection signal is sent to the power supply control section 55.

When the power supply control unit 55 receives the power failure detection signal, the power supply control unit 55
The converter start signal is set to low level to lower the output voltage (Fig. 7 ta).

Next, the commercial power supply 50 is restored, and the A-B of the -bracket rectifier 51
Even if the inter-mold pressure exceeds the power failure detection level (tb in Fig. 7), the power supply control unit 55 does not immediately issue a start signal, and the control circuit 58 uses a counting circuit provided in the power supply control unit 55 to recover from the transient state. Count the predetermined time until Then, after a predetermined period of time has elapsed, the DC-DC converter activation signal is set to high level to raise the output of the DC-DC converter.

In the event of a momentary power outage or power restoration, D
By controlling the C-DC converter, transient unstable conditions can be avoided and stable operation can be achieved.

Note that the power supply system shown in FIG. 6 can also operate stably during startup and shutdown by performing the above-mentioned control during startup and shutdown.

Further, the counting circuit provided in the power supply control section 55 may be configured by hardware using logic elements or the like, or may use a commonly known counting means such as using a microcomputer and controlling by software.

〔Effect of the invention〕

As described above, according to the present invention, the auxiliary power source for driving the control circuit of the DC-DC converter can be provided all at once as an external power source.
A power supply system including a converter can be downsized.

In addition, by controlling the startup and shutdown of the power supply system according to a specific sequence, it is possible to avoid transient unstable states of the DC-DC converter and ensure stable operation.

Furthermore, by installing a power outage detection circuit that monitors the drop in the primary input voltage of the DC-DC converter and controlling the power supply system in a specific sequence during power outages and restoration, it is possible to prevent instantaneous power outages and restoration of commercial power supplies. The DC-DC converter can operate stably.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the connection of a DC-DC converter to which the present invention is applied, FIG. 2 is a diagram for explaining the supply of auxiliary power in an uncertain state of the output of the DC-DC converter, and FIG. The figure shows an equivalent circuit of the rectifier/smoothing circuit shown in Fig. 2, Fig. 4 shows an example of a power supply system to which the DC-DC converter of the present invention is applied, and Fig. 5 shows the control shown in Fig. 4. FIG. 6 is a time chart showing the sequence of the DC-
FIG. 7 is a time chart showing the control sequence of FIG. 6, and FIG. 8 is a diagram showing an example of the prior art. 1, 2, 3...DC-DC converter, 4, 5, 6...
... Control circuit, 7... Negative polarity load, 8.9... Positive polarity load, 15... Reference potential line, 19... External power supply, 20... DC input voltage.

Claims (3)

[Claims] (1) In a power supply system consisting of a plurality of secondary control converter groups, an auxiliary power source for driving the control circuit of the converter is provided independently from the converter, and one end of the power output of the auxiliary power source is connected to each converter. The auxiliary power source is connected to a power input of a control circuit, and the other end of the power output of the auxiliary power source is connected to a reference potential line of a power supply system, thereby supplying driving power to the control circuits of the plurality of converters. Power supply system for information processing equipment. (2) In the power supply system according to claim (1), a first switch that turns on and off the output of the auxiliary power source, a second switch that turns on and off DC input to the converter group, and a second switch that turns on and off the output of the auxiliary power source; When starting up, turn on the first switch and then turn on the second switch, and then start the converter, and when falling, turn on the second switch after stopping the operation of the converter. A power supply system for an information processing device, comprising a first control means that turns off first switches in order. (3) The power supply system according to claim (2), further comprising: a power failure detection circuit that detects a drop in input voltage to the converter and outputs a power failure detection signal; and a power failure detection circuit that stops the converter based on the power failure detection signal, and A power supply system for an information processing device, comprising: second control means that starts the converter after a predetermined time has elapsed after the converter stops operating if the input voltage decreases for a short time.