JPH08331840A - Short-circuit protector in output voltage - Google Patents

Abstract

PURPOSE: To provide a short-circuit protector in an output voltage with a simple circuit configuration at low cost for protecting a stabilized power supply in a short circuit or overload state. CONSTITUTION: In a short circuit or overload state at output A and B, a decrease in voltage is detected by first and second voltage detecting units 4 and 8, and a H-level as data is transmitted to first and second quiescent control units 3 and 7 through a voltage data transmitting unit 10. When the quiescent of first and second stabilizing units 1 and 5 attains one hundred percent, the first and second stabilizing units 1 and 5 in a PWM switching method is stopped in its operation.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention can be used for portable equipment (hereinafter referred to as portable equipment) such as a video tape recorder with a built-in camera and a radio cassette tape recorder. The present invention relates to an output voltage short-circuit protection device in a DC-DC, PWM switching type stabilized power supply device.

[0002]

2. Description of the Related Art In recent years, portable devices have been reduced in size, weight and cost.

A conventional protective device for a stabilized power supply device of a portable device will be described below. As shown in FIG. 2, reference numeral 1 is a first stabilized power supply unit, 2 is a control unit of the first stabilized power supply unit 1, and 3 is a control unit of the first stabilized power supply unit 1 during a rest period. Of the first stabilized power supply unit 1 is a first voltage detection unit for detecting the output voltage of the first stabilized power supply unit 1, 5 is a second stabilized power supply unit, and 6 is a second stabilized power supply unit 5. The second control unit,
Reference numeral 7 is a second rest period control unit that controls the rest period of the second stabilized power supply unit 5, 8 is a second voltage detection unit that detects the output of the second stabilized power supply unit 5, and 9 is System control microcomputer that controls the whole system, 10 is the first
Of the voltage detection unit 4 and the second voltage detection unit 8 which transmits information to the system control microcomputer 9;
Reference numeral 11 is an input switch for turning the power on and off.

The operation of the protective device for the stabilized power supply device constructed as described above will be described below.

When the outputs A and B are short-circuited or overloaded, a voltage drop is detected by the first voltage detector 4 and the second voltage detector 8, and the information is detected by the voltage information transmitter 10.
Is transmitted to the system control microcomputer 9, which is another block, and is processed by the program software.
The input switch 11 was turned off.

[0006]

However, in the above-mentioned conventional configuration, it is necessary to transmit the output information of the stabilized power supply device to the system control microcomputer when the output is short-circuited or overloaded, and the circuit configuration is complicated. It was

The present invention solves the above-mentioned conventional problems, and protects a stabilized power supply device when an output is short-circuited or overloaded, and has a simple circuit configuration and low-cost output voltage short-circuit protection. The purpose is to provide a device.

[0008]

In order to achieve this object, the output voltage short-circuit protection device of the present invention uses 10 voltage information transmission units to convert information of 4 voltage detection units and 8 voltage detection units into 3 information. The configuration is such that it is transmitted to both the pause period control unit and the pause period control unit 7; that is, the pause period control unit 3 and the pause period control unit 7 are connected.

[0009]

According to the present invention, when the output A or the output B is short-circuited or overloaded, the information of the voltage detecting device A of 4 and the information of the voltage detecting device B of 8 are transmitted by the structure described above. Depending on the device, three idle period control devices A and 7
1 by transmitting to both of the rest period control device B of
It is possible to stop the switching operation of the stabilized power supply devices A and 5 and protect the plurality of stabilized power supply devices.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

As shown in FIG. 1, 1 is a first stabilized power supply section, 2 is a first control section of the first stabilized power supply section 1, and 3 is a rest period of the first stabilized power supply section 1. A first rest period control unit for controlling the above, 4 is a first voltage detection unit for detecting the output voltage of the first stabilized power supply unit 1, 5 is a second stabilized power supply unit, 6
Is a second control unit of the second stabilized power supply unit 5, 7 is a second suspension period control unit for controlling the suspension period of the second stabilized power supply unit 5, and 8 is a second stabilized power supply unit The second voltage detecting unit 10 for detecting the output voltage of the device 5 detects the information of the first voltage detecting unit 4 and the voltage detecting unit 8 from the first idle period controlling unit 3 and the second idle period controlling unit 7. It is a voltage information transmission unit that transmits to both.

The operation of the protective device for the stabilized power supply device configured as described above will be described below.

When the output A and the output B are short-circuited or overloaded, a voltage drop is detected by the first voltage detection unit 4 and the second voltage detection unit 8, respectively. The "H" level is transmitted to both the first pause period control unit 3 and the second pause period control unit 7B. As a result, the idle period of both the first stabilized power supply unit 1 and the second stabilized power supply unit 5 becomes 100%, and the PW
First and second stabilized power supply units 1 of M switching type
5 stops operating.

An example of the circuit diagram of this embodiment is shown in FIG. As described above, according to the present embodiment, among the outputs of the stabilized power supply unit having a multi-channel system, even if one place is short-circuited or overloaded, the information of each voltage detection unit is output to a plurality of units by the voltage information transmission device. It is transmitted to the idle period control unit. That is, by connecting a plurality of idle period control units, the plurality of stabilized power supply units can be stopped and protected.

[0015]

As described above, according to the present invention, among the outputs of the stabilized power supply device having the multi-channel system, the information of each voltage detecting unit is short-circuited even at one place or when the voltage is overloaded by the voltage information transmitting unit. It is transmitted to the plurality of idle period control units. That is, by connecting a plurality of idle period control units, it is possible to protect a plurality of stabilized power supply units. It is possible to realize an excellent output voltage short-circuit protection unit with a simple circuit configuration and low cost.

[Brief description of drawings]

FIG. 1 is a block diagram of an output short circuit protection device of the present invention.

FIG. 2 is a block diagram of a conventional output short circuit protection device.

FIG. 3 is a circuit configuration diagram of an embodiment of an output short circuit protection device of the present invention.

[Explanation of symbols]

 1 1st stabilized power supply part 2 1st control part 3 1st rest period control part 4 1st voltage detection part 5 2nd stabilized power supply part 6 2nd control part 7 2nd rest period control Section 8 Second voltage detection section 9 System control microcomputer 10 Voltage information transmission section 11 Input switch

Claims (1)

[Claims] 1. A plurality of stabilized power supply means provided with a DC-DC, PWM switching type channel system, a plurality of voltage detection sections for detecting a voltage effect when an output is short-circuited or overloaded, and the voltage detection section. An output voltage short-circuit protection device comprising: a rest period control unit that sets a rest period when a voltage drop is detected, and suspends the operation of the stabilized power supply means under the control of the rest period control unit.