JPS59201629A - Defect discriminating system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a failure determination method for a power supply device that supplies power to an electronic device from a plurality of power supply units operating in parallel.

fb) Technology Background Conventionally, power consumption for power supplies to electronic devices increases as the functions of electronic devices increase, requiring a large power supply, and high-frequency switching power supply circuits have been used as supply circuits for power supply devices. It has been adopted. In the high-frequency switching power supply circuit system, the power transformer and other peripheral electronic components are miniaturized, making it easy to control the rise and fall of the power supply voltage, and multiple such power supply units can be operated in parallel to supply large amounts of power to the load. In particular, when the supply voltage is low, a large current is required, and several power supply units may be operated in parallel to supply several thousand amperes of current to one voltage value of an electronic device.

(C) Prior Art and Problems The conventional supply circuit configuration of this type of power supply device will be described below. FIG. 1 is a block diagram showing a method of connecting power supplies to a load during parallel operation. Individual power supply units PSUI- of power supply unit group 1 that perform parallel operation
---The PS Un individually receives AC power from the blow mold source a, converts the AC power into DC power, and supplies the DC power to the load side 2.

The power supply unit group 1 that performs parallel operation is connected to the same polarity on the load side 2 by connecting the same polarity. The power supply control of the power supply unit/unit group 1 that performs parallel operation is centrally controlled by the power supply control device 3 (signal lines are shown by broken lines).
It is turned on and off by the on/off signal.

Since the individual power supply units PSUI--PSIIn of the power supply unit group 1 that perform parallel operation have the same circuit configuration, a block diagram of the circuit configuration of one power supply unit will be described with reference to FIG. 2. Identical objects are designated by the same reference numerals throughout the figures. In FIG. 2, the pulse width control circuit 4
The high-frequency switching pulses generated in the switching converter circuit 5 drive the switching elements 5a and 5b of the switching converter circuit 5, and the AC power source is received from the next assembly source side a, and the rectified DC is intermittent through the rectifier circuit 6. Get waves. Next, the DC intermittent wave is transmitted to the secondary side through the transformer 7, and DC power is supplied to the load side through the rectifier circuit. The overcurrent detection circuit 8 also has a detector 8a that detects the current flowing through the transformer 7, and serves as a protection circuit that sends a signal to the pulse width control circuit 4 and protects the power supply unit in the event of an overcurrent. . The output voltage detection circuit 9 detects the output voltage of the load side, sends a signal to the pulse width control circuit 4, and under the control of the pulse width control circuit 4, changes the switching time of the switching converter circuit 5 to control the pulse width. It plays the role of a constant voltage circuit that stabilizes the output voltage. The output low voltage detection circuit 10 is an alarm circuit that sends an abnormality signal to the power supply control device 3 to shut off the power to the power supply unit when the voltage at both ends of the load drops abnormally.

FIG. 4 is an output voltage/current characteristic diagram during normal parallel operation. Suppose there are three power supply units, and each power supply unit is connected to PSUI, PS
Power supply unit PSU1 in parallel operation with U2 and PSU3
, PSU2, and PSU3 have some differences in their output voltages, so the higher the output voltage, the higher the output voltage on the drawing.
The explanation will be given in the order of PSU3. The straight line connecting the point p, where the output voltage point e and the output type W< i point intersect, and the point 0 is called the load line.The slope angle of the load line changes depending on the characteristics of the load, but in the drawing, only the output current point i is connected. A case is shown in which three power supply units, PSUI, PSU2, and PSU3, are used to supply the required load. 3 for output current i capacity
Parallel operation is performed with two power supply units, and there is surplus power for one unit. For example, if one of the three power supply units operating in parallel fails due to some abnormality, the output voltage/current characteristics diagram shown in Figure 5 would be become,
The output voltage of the power supply unit PSU1 becomes zero, but since it is operated in parallel, the normal voltage is applied to the output voltage terminal of the load side, so which power supply unit of the power supply units operated in parallel is applied.・Node output low voltage detection circuit 10
It is not possible to determine whether the PSUI is malfunctioning. In addition, even if one of the power supply units in parallel operation fails, since the power supply units are connected in parallel operation, it is necessary to disconnect each unit from the load circuit and search for the failed power supply unit. This has the drawback of requiring a lot of time to investigate faults in failed power supply units.

(d+ OBJECT OF THE INVENTION The present invention aims to solve this drawback of the conventional power supply unit that is difficult to detect when a malfunction occurs.

(e) Structure of the Invention And, for this purpose, the present invention provides a power supply device that supplies power to an electronic device from a plurality of power supply units that operate in parallel, including a power supply control device that controls the plurality of power supply units, and a power supply control device that controls the plurality of power supply units; - a voltage detection circuit that detects the secondary winding voltage for each power supply unit; and a control circuit that increases the output voltage according to a signal from the power supply control device, and a control circuit that increases the output voltage by a signal from the power supply control device; This is achieved by the present invention, which is configured such that when the voltage is sent to the control circuit, the voltage detection circuit determines that a power supply unit that does not detect a voltage is abnormal.

According to the present invention, this voltage can be applied to each of the power supply units running in parallel when the equipment starts operating, or even when it is determined that one of the power supply unit 1- is malfunctioning. By sending an instruction signal to increase the voltage to the control circuit and receiving a voltage application detection signal from the voltage detection circuit, it is possible to easily determine which power supply unit is malfunctioning.

Therefore, even if one of the power supply units connected in parallel operation fails, each power supply unit connected in parallel operation can be disconnected from the load circuit and the failed power supply unit can be removed. This makes it easy to detect a faulty power supply unit, which greatly reduces the time required to investigate a fault. At the same time, it is also possible to check the function of each power supply unit when starting the operation of parallel operation power supply units, making it possible to This has the advantage that DC power can be safely supplied from multiple power supply units in parallel operation.

(f) Example of the Invention An example of the present invention will be described below. FIG. 3 is a circuit configuration block diagram of one power supply unit according to the present invention. 11 is a transformer, 12 is a voltage detection circuit, 13 is a power supply control device, and 14 is a pulse width control circuit. The secondary winding of the transformer 11 is separated into two sections, Ila and llb, and the output voltage of Ila passes through a smoothing circuit to the load side, Il.
The output voltage b is applied to the voltage detection circuit 12 via a smoothing circuit. The voltage detection circuit 12 detects the voltage applied from the Ilb side and sends a voltage application detection signal (VO (IT times signal) to the power supply control device 13.The power supply control device 13 has a It has a function of sending an instruction signal (MARGIN signal) to the pulse width control circuit 14, and the pulse width control circuit 14 receives MAI? from the power supply control device 13.
The GIN signal drives the switching converter circuit 5 by changing its pulse width, thereby increasing the output voltage.

Output voltage/current characteristics as shown in Fig. 4, that is, power supply unit PSU1 has VOUT=1, power supply unit PSU2
is VOUT-4, power supply unit PS [I3 is VOtlT
= When it is O, the power supply is unisolated) PSUI3
When the power supply controller 13 sends the old RGIN signal to the pulse width control circuit 14 of the PSLI3 and increases the output voltage of the power supply Unisol l-PSU3, PSU3 and psυ2 are swapped as shown in Figure 7. , the voltage detection circuit 12 of the power supply unit l-, PSU3 detects the voltage,
Sends the νOUT signal to the power supply control device 13, and outputs the VOUT
= 1, it is determined that the power unit, 1-PS[I3, is normal. For example, if the power supply unit PSIII malfunctions due to some foreign item, the output voltage/current characteristics will be as shown in Figure 5, and the power supply "Near PS"
U2 and PSU3 are VOUT = 1 power supply unit PSI
II becomes VOUT = 0, and power supply unit PSU1
MA from the power supply control device 13 to the Nohalus width control circuit 14.
The RGIN signal is sent out to increase the output voltage of the power supply unisol I-PSUI, but the power supply unisol I-PSUI
Because PS[11 is out of order, the output voltage/current characteristics are as shown in Figure 6.The voltage detection circuit 12 of the PSUI does not detect the voltage and VOLIT remains at 0, indicating that the power supply unit PSUI is out of order. I understand. The above operation is performed for each of the plurality of power supply units operated in parallel, and the power supply control device 13 sends the MARGIN signal to the pulse width control circuit 14 of the corresponding power supply unit, and the voltage detection circuit 1
2 or 9 (7) VOUT signal is v6UT-1ka vOUT
By detecting =0, it can be easily determined whether the power supply unit is malfunctioning or normal.

(g) As described in the detailed description of the invention, the power supply control device according to the present invention includes a MAR.
By providing a function for transmitting a GIN signal and a function for transmitting a VOIJT signal from a voltage detection circuit for each of a plurality of power supply units, it is possible to easily determine which power supply unit is malfunctioning.

[Brief explanation of drawings]

Figure 1 is a block diagram of the wiring method for parallel operation power supply units.
FIG. 2 is a circuit configuration block diagram of one conventional power supply unit, FIG. 3 is a circuit configuration block diagram of one power supply unit according to the present invention, and FIGS. 4, 5, 6, and 7 are power supply FIG. 4 is an output voltage/current characteristic diagram under various conditions of the unit. In the drawing, 1 is a group of power supply units that operate in parallel; 2 is a group of power supply units that operate in parallel;
is the load side, 5 is a switching converter circuit, 8 is an overcurrent detection circuit, 9 is an output voltage detection circuit, 10 is an output low voltage detection circuit, 11 is a transformer, 12 is a voltage detection circuit, 13 is a power supply control device, 14 indicate the pulse width control circuit, respectively.

Claims (1)

[Claims] In a power supply device that supplies power to an electronic device from a plurality of power supply units that operate in parallel, a power supply control device that controls the plurality of power supply units, and a voltage that detects a secondary winding voltage of each of the plurality of power supply units. a detection circuit; and a control circuit that increases an output voltage in response to a signal from the power supply control device, and when a signal to increase the output voltage is sent from the power supply control device to the control circuit, the voltage detection circuit detects a voltage. A failure determination method characterized in that a power supply unit that does not fail is determined to be abnormal.