JP2000308332A - Switching regulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To turn off all power supply channels, when a short circuit occurs in some switching regulator unit. SOLUTION: Each of switching regulator units 12A, 12B, and 12C outputs a short-circuit detecting signal to a short-circuit information collecting circuit 14, when its built-in short-circuit protective circuit detects a short circuit in a power supply channel to be monitored. Upon detecting the short-circuit detecting signal from any one of the units 12A-12C, the circuit 14 supplies a short-circuit operating signal to all units 12A-12C. Each of the units 12A, 12B, and 12C turns off all power supply channels under its control, in response to the short-circuit operating signal from the short-circuit information collecting circuit 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a switching regulator.

[0002]

2. Description of the Related Art In recent electronic devices, low power consumption is desired. Therefore, circuit modules having different minimum voltages have been adopted, and the number of power supply channels has been increased so that the power consumption can be reduced by reducing the circuit voltage even slightly.

FIG. 9 is a block diagram showing a schematic configuration of a conventional switching regulator. 310 is a power battery, 3
12A and 312B are switching regulator units, and 314 is each switching regulator unit 3.
Microcomputer for controlling 12A and 312B, 3
Reference numeral 16 denotes a load circuit. Here, the switching regulator unit 312A has four power supply channels, and the switching regulator unit 312B has two power supply channels.

Reference numeral 318A denotes a control IC of the switching regulator unit 312A, which includes switching control circuits 320a to 320d for the number of power supply channels, a short-circuit protection circuit 322A, a reference voltage 324A, and a unit 312A.
A power supply control circuit 326 for controlling power supply to each part in A
A is provided. 328 a to 328 d are power batteries 310
Switching and rectifying the output voltage of
The rectifier circuits 330a to 330d are voltage divider circuits that divide the output voltage of the switching / rectifier circuits 328a to 328d and supply the divided voltage to the short-circuit protection circuit 322A for short-circuit detection. Switching / rectifier circuits 328a-3
The output voltage of 28 d is supplied to the load circuit 316.

Similarly, reference numeral 318B denotes a control IC of the switching regulator unit 312B, which includes switching control circuits 320e and 320f corresponding to the number of power supply channels.
A short-circuit protection circuit 322B, a reference voltage 324B, and a power control circuit 326B for controlling power supply to each unit in the unit 312B are provided. 328e and 328f are switching and rectifying circuits for switching and rectifying the output voltage of the power supply battery 310, and 330e and 330f respectively divide the output voltage of the switching and rectifying circuits 328e and 328f to provide a short-circuit protection circuit for short-circuit detection. 322B. Switching / rectifier circuit 328
e, the output voltage of 328f is supplied to the load circuit 316.

The short-circuit protection circuit 322A includes a voltage dividing circuit 330
Each of the output voltages a to 330d is compared with the output voltage of the reference voltage 324A to detect whether or not each power supply channel is short-circuited. The short-circuit protection circuit 322A includes voltage dividing circuits 330a to 33
When a short circuit is detected in any of the power supply channels a to d by the output of 0d, all switching control circuits 320a to 320a-3
A short-circuit detection signal is supplied to 20d. Each of the switching control circuits 320a to 320d responds to the short-circuit detection signal to switch / rectify circuits 328a to 328, respectively.
The switching operation of d is stopped. Similarly, the short-circuit protection circuit 322B is activated by the short-circuit of the power supply channel e or f.
The switching operations of the switching / rectifying circuits 328e and 328f are stopped by the switching control circuits 320e and 320f.

[0007]

As described above, in the conventional switching regulator, since the control ICs 318A and 318B of each switching regulator unit independently protect the short circuit, a short circuit occurs in any one of the power supply channels. However, the protection operation stayed within the power supply channel managed by the same control IC, and did not extend to the power supply channel managed by a different control IC. As a result, there is a power channel that is turned off and a power channel that remains powered on at the same time, and a voltage having a relationship different from that in the normal state may be supplied to the load circuit 316. Load circuit 316
Inside, a large number of circuits connected to each power supply channel are connected in a complicated manner, and if a voltage different from an ordinary voltage is supplied, the circuit may run away or components may be destroyed.

An object of the present invention is to provide a switching regulator in which all power supply channels are under one short-circuit protection operation.

Another object of the present invention is to provide a switching regulator in which all power supply channels are subjected to one short-circuit protection operation without increasing costs and components.

Another object of the present invention is to provide a switching regulator in which all power supply channels are under one short-circuit protection operation with the addition of a small circuit.

[0011]

A switching regulator according to the present invention is a switching regulator comprising a plurality of switching regulator units each having a fault protection circuit, and collects fault information in each switching regulator unit. Failure information collecting means for notifying a predetermined signal to each switching regulator unit in response to detection of a failure in any of the switching regulator units is provided, and each switching regulator unit receives the predetermined signal from the failure information collecting means. According to the signal, the associated power supply channel is protected.

Preferably, each switching regulator unit turns off a predetermined internal circuit in accordance with the predetermined signal from the failure information collecting means.

The failure information collecting means collects, for example, a failure detection signal of a failure protection circuit of each switching regulator unit, and sends a predetermined signal to each switching regulator unit in response to the failure detection in one of the switching regulator units. Means for notifying the user.

The fault information collecting means also monitors one power supply channel provided by each switching regulator unit, and when detecting a fault in any of the monitored power supply channels, sends a predetermined signal to each switching regulator unit. It is a means to notify.

[0015]

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

FIG. 1 is a schematic block diagram showing a first embodiment of the present invention. 10 is a power supply battery, 12A, 12B, 1
2C is a switching regulator unit that generates a predetermined voltage from the output of the power supply battery 10. Each switching regulator unit 12A, 12B, 12C
Is basically a switching regulator unit 3
The control IC has the same components as the short-circuit protection circuits 322A and 322B. Reference numeral 14 denotes a short-circuit information collecting circuit that supplies a short-circuit operation signal to all the switching regulator units 12A, 12B, and 12 in accordance with a short-circuit detection signal from the switching regulator units 12A, 12B, or 12; Is a load circuit.

The operation of this embodiment will be described. Each switching regulator unit 12A, 12B, 12C
When the built-in short circuit protection circuit detects a short circuit in the power supply channel to be monitored, it outputs a short circuit detection signal to the short circuit information collecting circuit 14. For example, if there is a short circuit in any one of the power supply channels of the switching regulator unit 12A, the short circuit protection circuit of the control IC in the switching regulator unit 12A detects the short circuit and sends a short circuit detection signal to the short circuit information collecting circuit 14. Is output. The short-circuit information collecting circuit 14 includes the switching regulator unit 1
When a short-circuit detection signal is received from 2A, a short-circuit operation signal is supplied to all switching regulator units 12A, 12B, and 12C. Each switching regulator unit 12A, 12B, 12C
When the short-circuit operation signal is input from the, all the power supply channels under management are brought into a short-circuit protection state, for example, a power-off state.
Therefore, which switching regulator unit 12
Even when A, 12B, and 12C detect a short circuit, all power supply channels that supply power to the load circuit 16 are in a short circuit protection state, for example, a power off state.

In the embodiment shown in FIG. 1, the short-circuit detection output of the short-circuit protection circuit of the existing control IC is collected outside the IC and logically judged, and all the power supply channels of all the switching regulator units are controlled to the short-circuit holding control state. By simply providing the short-circuit information collecting circuit 14 to be operated, even if a short-circuit occurs in any one of the power supply channels, all the power supply channels can be controlled to the short-circuit protection state. Therefore, only a simple logic circuit 14 needs to be added.

FIG. 2 is a schematic block diagram of a second embodiment of the present invention. 110 is a power battery, 112A, 112
B is a switching regulator unit, 114 is each switching regulator unit 112A, 112
A microcomputer for controlling B, and 116 is a load circuit. Switching regulator unit 112A
Has four power channels, and the switching regulator unit 112B has two power channels.

Reference numeral 118A denotes a control IC for the switching regulator unit 112A, which includes switching control circuits 120a to 120d for the number of power supply channels, a short-circuit protection circuit 122A, a reference voltage 124A, and a unit 112.
A power supply control circuit 126 for controlling power supply to each part in A
A is provided. 128a to 128d are power batteries 110
Switching and rectifying the output voltage of
The rectifier circuits 130a to 130d are voltage divider circuits that divide the output voltage of the switching / rectifier circuits 128a to 128d and supply the divided voltage to the short-circuit protection circuit 122A for short-circuit detection. Switching / rectifier circuits 128a-1
The output voltage of 28d is supplied to the load circuit 116.

Similarly, reference numeral 118B denotes a control IC of the switching regulator unit 112B, and the switching control circuits 120e, 120f,
A short-circuit protection circuit 122B, a reference voltage 124B, and a power control circuit 126B for controlling power supply to each unit in the unit 112A are provided. 128e and 128f are switching and rectifying circuits for switching and rectifying the output voltage of the power supply battery 110. 130e and 130f respectively divide the output voltage of the switching and rectifying circuits 128e and 128f, and are short-circuit protection circuits for short-circuit detection. This is a voltage dividing circuit that supplies the voltage to the terminal 122B. Switching / rectifier circuit 128
The output voltages of e and 128f are supplied to the load circuit 116.

The short-circuit protection circuit 122A includes a voltage dividing circuit 130
Each of the output voltages a to 130d is compared with the output voltage of the reference voltage 124A to detect whether or not each power supply channel is short-circuited. The short-circuit protection circuit 122a includes voltage dividing circuits 130a-13
When a short circuit is detected in any of the power supply channels a to d by the output of 0d, a short circuit detection signal is supplied to all the switching control circuits 120a to 120d and the microcomputer 114 in the same unit 112A. The switching control circuits 120a to 120d respectively switch and rectify circuits 128a to 128d in accordance with the short-circuit detection signal.
The switching operation of 8d is stopped.

Similarly, when the short-circuit protection circuit 122B detects a short circuit in any one of the power supply channels e and f based on the output of the voltage dividing circuits 130e and 130f, the short-circuit protection circuit 122B outputs the same unit 112.
A short-circuit detection signal is supplied to the switching control circuits 120e and 120f in B and the microcomputer 114.
The switching control circuits 120e and 120f stop the switching operations of the switching / rectifying circuits 128e and 128f, respectively, according to the short-circuit detection signal.

The microcomputer 114 supplies a power-off signal to the power control circuits 126A and 126B in response to the short-circuit detection signal from the short-circuit protection circuit 122A or 122B. The power supply control circuit 126A turns off power supply to the switching control circuits 120a to 120d, the short-circuit protection circuit 122A, and the switching / rectifying circuits 128a to 128d in response to a power-off signal from the microcomputer 114. Thereby, the power supply channels a to d are substantially turned off. Similarly, the power supply control circuit 126B responds to a power-off signal from the microcomputer 114 to switch the switching control circuits 120e, 120e.
20f, the power supply to the short-circuit protection circuit 122B and the switching / rectifying circuits 128e and 128f is turned off. As a result, the power supply channels e and f are turned off.

For example, assume that the short-circuit protection circuit 122A detects a short-circuit in the power supply channel a from the output of the voltage dividing circuit 130a. At this time, the short-circuit protection circuit 122A is connected to all the switching control circuits 120a to 120a in the same unit 112A.
A short-circuit detection signal is supplied to the microcomputer 120d and the microcomputer 114. Switching control circuits 120a to 120
d stops the switching operation of the switching / rectifying circuits 128a to 128d according to the short-circuit detection signal. As a result, the power supply channels a to d are turned off.

The microcomputer 114 supplies a power-off signal to the power control circuits 126A and 126B in response to the short-circuit detection signal from the short-circuit protection circuit 122A. The power supply control circuits 126A and 126B cut off the power supply to the circuits in the units 112A and 112B, respectively, in response to the power off signal from the microcomputer 114.
Thus, the power supply channels e and f are also turned off.

In the embodiment shown in FIG.
It is only necessary to mediate the short-circuit detection outputs of 2A and 122B as a power-off signal to another switching regulator unit, without adding components and without increasing costs.
When any of the power supply channels is short-circuited, all the power supply channels can be protected.

In the conventional example, during the short-circuit protection operation, only the switching operation of the switching / rectifying circuit for supplying power to each power supply channel is stopped, and power is still supplied to the control IC of each switching regulator unit. However, in the embodiment shown in FIG.
Since the power of the 2A and 112B is turned off, unnecessary power consumption can be suppressed.

FIG. 3 shows a schematic block diagram of a third embodiment of the present invention. In this embodiment, the embodiment shown in FIG. 2 is modified so that a short-circuit detection signal output from a short-circuit protection circuit of each switching regulator unit is supplied to a power supply control circuit of another unit. Specifically, the switching regulator units 140A and 140B include a power control circuit 1 instead of the power control circuits 126A and 126B.
42A and 142B. The short-circuit detection signal output from the short-circuit protection circuit 122B of the switching regulator unit 140B is input to the power supply control circuit 142A as a power-off signal.
The short-circuit detection signal output from the short-circuit protection circuit 122A of the switching regulator unit 140A is input as a power-off signal. Microcomputer 144
Controls the power supply control circuits 142A and 142B in the same manner as in the conventional example. In addition, the same components as those in the embodiment shown in FIG. 2 are denoted by the same reference numerals.

The power control circuits 142A and 142B are provided with other switching regulator units 140B and 140B.
A in response to the short-circuit detection signal from
A and 126B operate in the same manner as in response to the power-off signal from the microcomputer 114, and cut off the power supply to each part in the same unit. Thus, as in the embodiment shown in FIG. 2, all the power supply channels can be protected when any of the power supply channels is short-circuited. Power consumption during short-circuit protection can be reduced.

The embodiment shown in FIG. 3 is useful when the microcomputer does not have a terminal to which a short-circuit detection signal can be input.

FIG. 4 is a schematic block diagram of a fourth embodiment of the present invention. 210 is a power battery, 212A, 212B
Is a switching regulator unit, 214 is each switching regulator unit 212A, 212B
And 216 is a load circuit. The switching regulator unit 212A has four power supply channels, and the switching regulator unit 212B has two power supply channels.

Reference numeral 218A denotes a control IC for the switching regulator unit 212A, which includes switching control circuits 220a to 220d for the number of power supply channels, a short-circuit protection circuit 222A, a reference voltage 224A, and a unit 212.
A power supply control circuit 226 for controlling power supply to each part in A
A is provided. 228a to 228d are power batteries 210
Switching and rectifying the output voltage of
The rectifier circuits 230a to 230d are voltage divider circuits for dividing the output voltages of the switching / rectifier circuits 228a to 228d, respectively. Voltage dividing circuits 230a, 230b, 230
The output voltage of the short-circuit protection circuit 222 is the same as in the previous embodiment.
A, and the output of the voltage dividing circuit 230d is supplied to a short circuit detecting circuit 232 that notifies other units of the occurrence of a short circuit. Output voltages of the switching / rectifying circuits 228 a to 228 d are supplied to the load circuit 316.

Similarly, reference numeral 218B denotes a control IC of the switching regulator unit 212B, and the switching control circuits 220e, 220f,
A short-circuit protection circuit 222B, a reference voltage 224B, and a power supply control circuit 226B for controlling power supply to each unit in the unit 212B are provided. 228e and 228f are switching / rectifying circuits for switching and rectifying the output voltage of the power supply battery 210, and 230e and 230f are voltage dividing circuits for dividing the output voltages of the switching / rectifying circuits 228e and 228f, respectively. The output voltage of the voltage dividing circuit 230e is applied to the short circuit detecting circuit 232, and the output voltage of the voltage dividing circuit 230f is applied to the short circuit protecting circuit 222B as in the previous embodiment. Switching / rectifier circuits 328e, 328
The output voltage of f is supplied to the load circuit 316.

The short-circuit detecting circuit 232 includes a voltage dividing circuit 230
When any one of the output voltages of the short circuits d and 230e becomes equal to or lower than a predetermined value, a short detection signal is supplied to the remaining short input terminals of the short protection circuits 222A and 222B.

The operation of the short-circuit protection circuits 222A and 222B itself is exactly the same as the short-circuit protection circuits 322A and 322B of the conventional example and the short-circuit protection circuits 122A and 122B of the previous embodiment. That is, the short-circuit protection circuit 222A compares each output voltage of the voltage dividing circuits 230a to 230c and the short-circuit detection circuit 232 with the output voltage of the reference voltage 224A to detect whether each power supply channel is short-circuited. Short circuit protection circuit 222A
Are the voltage dividing circuits 230a to 230c and the short circuit detecting circuit 23
2 becomes a low voltage value corresponding to the short-circuit state, all the switching control circuits 220a to 220d
Is supplied with a short-circuit detection signal. Each switching control circuit 2
20a to 220d stop the switching operations of the switching / rectifying circuits 228a to 228d, respectively, according to the short-circuit detection signal. Similarly, the short-circuit protection circuit 22
2B, when the output of the short circuit detecting circuit 232 and the output of the voltage dividing circuit 230f indicate a short circuit state,
Switching / rectifying circuit 228 by 20e and 220f
e, stop the switching operation of 228f.

For example, assume that a short circuit occurs in the power supply channel a. In this case, the output voltage of the voltage dividing circuit 230a decreases. In response to this, the short-circuit protection circuit 222A supplies a short-circuit detection signal to all the switching control circuits 220a to 220d, and the respective switching control circuits 220a to 220d
Stops the switching operation of each of the switching / rectifying circuits 228a to 228d according to the short-circuit detection signal. As a result, the power supply channels a to d are turned off.

As a result of the power supply channel d being turned off, the output voltage of the voltage dividing circuit 230d decreases, and the short circuit detection circuit 232 supplies a short circuit detection signal to the short circuit protection circuits 222A and 222B. The short-circuit protection circuit 222B supplies a short-circuit detection signal to all the switching control circuits 220e and 220f in response to the short-circuit detection signal from the short-circuit detection circuit 232, and each of the switching control circuits 220e and 220f responds to the short-circuit detection signal. Each switching / rectifying circuit 22
8e and 228f are stopped. Thus, the power supply channels e and f are also turned off.

As described above, when a short circuit occurs in any power channel of any unit, not only the power channel belonging to the same unit as the power channel but also the power channel belonging to another unit is short-circuit protected. State controlled.

When a short circuit occurs in the power supply channel d or e, the short circuit detection circuit 232 detects the short circuit and notifies the short circuit protection circuits 222A and 222B, and the short circuit protection circuit 222A
Put the power supply channels a to d in a short-circuit protection state, and the short-circuit protection circuit 222B puts the power supply channels e and f in a short-circuit protection state.

It is clear that the short-circuit detection circuit 232 can be realized by a simple logic circuit. FIGS. 5, 6, 7, and 8 show circuit examples of the short-circuit detection circuit 232. FIG.

In FIG. 5, reference numeral 240 denotes a comparison circuit for comparing the output voltage of the voltage dividing circuit 230d with the output voltage Vref of the reference voltage source 242, and 244 denotes the output voltage of the voltage dividing circuit 230e and the output voltage Vref of the reference voltage source 242. Is an AND circuit that takes the logical product of the comparison results of the comparison circuits 240 and 244. The comparison circuit 240 outputs “H” when the output voltage of the voltage dividing circuit 230d is equal to or higher than Vref.
Is output, otherwise "L" is output. Similarly,
The comparison circuit 244 detects that the output voltage of the voltage dividing circuit 230 e is Vr
"H" is output if ef or more, otherwise "H" is output.
L ″. The AND circuit 246 includes a comparison circuit 240,
Since the logical product of the outputs of 244 is obtained, any of the voltage dividing circuits 23
When the output voltages of 0d and 230e become lower than Vref, the output of the AND circuit 246 becomes "L". AND circuit 24
The "L" output of the short circuit protection circuit 22 is used as a short circuit detection signal.
2A and 222B.

In the circuit configuration shown in FIG. 6, the functions of comparison circuits 240 and 244 in the circuit configuration shown in FIG. 5 are replaced by the input level identification function of AND circuit 248. This is useful when the short-circuit detection level does not need to be strict. Since the identification threshold of the input level of the AND circuit 248 becomes the short-circuit detection level, the voltage dividing circuit 230d,
Set and adjust 230e partial pressure ratio.

FIG. 7 is a circuit example when the voltage of the power supply channel e is a negative voltage. The reference voltage source 242 is connected to the minus input of the comparison circuit 250 instead of the comparison circuit 244.
And the output of the voltage dividing circuit 230e is applied to the plus input of the comparing circuit 250. The comparison circuit 250
When the absolute value of the output voltage of the voltage dividing circuit 230e is equal to or higher than Vref, "H" is output, and otherwise, "L" is output. The output of the AND circuit 246 is the same as in FIG.

FIG. 8 is a circuit example corresponding to FIG. 6 when the voltage of the power supply channel e is a negative voltage. Inverter 252 inverts the output of voltage dividing circuit 230e. The AND circuit 254 calculates the logical product of the output voltage of the voltage dividing circuit 230d and the output voltage of the inverter 252. AND circuit 25
4 outputs “H” when the output voltage value of the voltage dividing circuit 230d and the inverter 252 is equal to or higher than the threshold level of the input voltage value, and outputs “L” otherwise. Therefore, when the output voltage value of the voltage dividing circuit 230d or 230e becomes a value indicating a short circuit, the output of the AND circuit 254 becomes “L”.

As described above, by simply adding a short-circuit detection circuit having a simple configuration to an existing circuit, all power supply channels can be reliably protected against short-circuit of any one of the power supply channels. Further, since an unused terminal of the existing short-circuit protection circuit is used, it is effective when there is no unused input terminal in the switching regulator control IC and the microcomputer.

[0047]

As can be easily understood from the above description, according to the present invention, when a failure occurs in any of the power supply channels, all the power supply channels can be protected.
By using the output signal of the existing short-circuit protection circuit as the short-circuit information, all the power supply channels can be protected without increasing the cost and increasing the number of components. By providing a means for detecting a fault in one power supply channel of each switching regulator unit and notifying each unit,
Even if a failure occurs in any one of the power supply channels, all the power supply channels can be protected only by adding a small circuit.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a first embodiment of the present invention.

FIG. 2 is a schematic configuration block diagram of a second embodiment of the present invention.

FIG. 3 is a schematic configuration block diagram of a third embodiment of the present invention.

FIG. 4 is a schematic block diagram of a fourth embodiment of the present invention.

FIG. 5 is a schematic configuration block diagram of a first example of a short-circuit detection circuit 232;

FIG. 6 is a schematic configuration block diagram of a second example of the short-circuit detection circuit 232;

FIG. 7 is a schematic configuration block diagram of a third example of the short-circuit detection circuit 232;

FIG. 8 is a schematic configuration block diagram of a fourth example of the short-circuit detection circuit 232;

FIG. 9 is a schematic block diagram of a conventional example.

[Explanation of symbols]

10: Power battery 12A, 12B, 12C: Switching regulator
Unit 14: Short circuit information gathering circuit 16: Load circuit 110: Power supply battery 112A, 112B: Switching regulator unit 114: Microcomputer 116: Load circuit 118A, 118B: Control IC 120a to 120d: Switching control circuit 122A, 122B: Short circuit protection Circuits 124A, 124b: Reference voltages 126A, 126B: Power supply control circuits 128a to 128f: Switching / rectifier circuits 130a to 130f: Voltage divider circuits 140A, 140B: Switching regulator units 142A, 142B: Power supply control circuits 144: Microcomputer 210: Power supply batteries 212A, 212B: Switching regulator unit 214: Microcomputer 216: Load circuit 218A, 218B: Control IC 220a To 220d: switching control circuit 222A, 222B: short circuit protection circuit 224A, 224B: reference voltage 226A, 226B: power supply control circuit 228a to 228f: switching / rectifying circuit 230a to 230f: voltage dividing circuit 232: short circuit detecting circuit 240: comparing circuit 242: reference voltage source 244: comparison circuit 246: AND circuit 248: AND circuit 250: comparison circuit 252: inverter 254; AND circuit 310: power supply battery 312A, 312B: switching regulator unit 314: microcomputer 316: load circuit 318A, 318B: Control IC 320a to 320f: Switching control circuit 322A, 322B: Short circuit protection circuit 324A, 324B: Reference voltage 326A, 326B: Power supply control circuit 328a to 328f: Sui Quenching and rectifier circuit 330a~330f: voltage divider circuit

Claims (4)

[Claims] 1. A switching regulator comprising a plurality of switching regulator units each provided with a fault protection circuit, collecting fault information in each switching regulator unit and detecting a fault in one of the switching regulator units. In response to the above, a fault information collecting means for notifying each switching regulator unit of a predetermined signal is provided, and each switching regulator unit protects the power supply channel to which the switching power supply channel belongs according to the predetermined signal from the fault information collecting means. Switching regulator characterized. 2. Each switching regulator unit according to the predetermined signal from the fault information collecting means,
2. The switching regulator according to claim 1, wherein a predetermined internal circuit is turned off. 3. The fault information collecting means collects a fault detection signal of a fault protection circuit of each switching regulator unit, and sends the fault detection signal to each switching regulator unit in response to fault detection in one of the switching regulator units. 2. A means for notifying a predetermined signal.
A switching regulator according to claim 1. 4. The fault information collecting means monitors one power supply channel provided by each switching regulator unit, and when a fault is detected in any of the monitored power supply channels, a predetermined signal is sent to each switching regulator unit. The switching regulator according to claim 1, wherein the switching regulator is a means for notifying a signal.